fix: Fix regression where Postgres DSN wouldn't be detected

There was a typo where databaseBackendName == "postgresql" was
"postgres" instead on accident.

.gitignore

@@ -1,8 +1,10 @@
 # Go artifacts
+backend/api/api
 backend/sshbackend/sshbackend
 backend/dummybackend/dummybackend
+backend/sshappbackend/local-code/remote-bin
+backend/sshappbackend/local-code/sshappbackend
 backend/externalbackendlauncher/externalbackendlauncher
-backend/api/api
 frontend/frontend
 
 # Backup artifacts

.prettierrc

@@ -1,16 +0,0 @@
-{
-  "arrowParens": "avoid",
-  "bracketSpacing": true,
-  "htmlWhitespaceSensitivity": "css",
-  "insertPragma": false,
-  "jsxSingleQuote": false,
-  "printWidth": 80,
-  "proseWrap": "always",
-  "quoteProps": "as-needed",
-  "requirePragma": false,
-  "semi": true,
-  "singleQuote": false,
-  "tabWidth": 2,
-  "trailingComma": "all",
-  "useTabs": false
-}

CHANGELOG.md

@@ -1,49 +0,0 @@
-# Changelog
-
-## [v1.1.2](https://github.com/imterah/nextnet/tree/v1.1.2) (2024-09-29)
-
-## [v1.1.1](https://github.com/imterah/nextnet/tree/v1.1.1) (2024-09-29)
-
-## [v1.1.0](https://github.com/imterah/nextnet/tree/v1.1.0) (2024-09-22)
-
-**Fixed bugs:**
-
-- Desktop app fails to build on macOS w/ `nix-shell` [\#1](https://github.com/imterah/nextnet/issues/1)
-
-**Merged pull requests:**
-
-- chore\(deps\): bump find-my-way from 8.1.0 to 8.2.2 in /api [\#17](https://github.com/imterah/nextnet/pull/17)
-- chore\(deps\): bump axios from 1.6.8 to 1.7.4 in /lom [\#16](https://github.com/imterah/nextnet/pull/16)
-- chore\(deps\): bump micromatch from 4.0.5 to 4.0.8 in /lom [\#15](https://github.com/imterah/nextnet/pull/15)
-- chore\(deps\): bump braces from 3.0.2 to 3.0.3 in /lom [\#13](https://github.com/imterah/nextnet/pull/13)
-- chore\(deps-dev\): bump braces from 3.0.2 to 3.0.3 in /api [\#11](https://github.com/imterah/nextnet/pull/11)
-- chore\(deps\): bump ws from 8.17.0 to 8.17.1 in /api [\#10](https://github.com/imterah/nextnet/pull/10)
-
-## [v1.0.1](https://github.com/imterah/nextnet/tree/v1.0.1) (2024-05-18)
-
-**Merged pull requests:**
-
-- Adds public key authentication [\#6](https://github.com/imterah/nextnet/pull/6)
-- Add support for eslint [\#5](https://github.com/imterah/nextnet/pull/5)
-
-## [v1.0.0](https://github.com/imterah/nextnet/tree/v1.0.0) (2024-05-10)
-
-## [v0.1.1](https://github.com/imterah/nextnet/tree/v0.1.1) (2024-05-05)
-
-## [v0.1.0](https://github.com/imterah/nextnet/tree/v0.1.0) (2024-05-05)
-
-**Implemented enhancements:**
-
-- \(potentially\) Migrate nix shell to nix flake [\#2](https://github.com/imterah/nextnet/issues/2)
-
-**Closed issues:**
-
-- add precommit hooks [\#3](https://github.com/imterah/nextnet/issues/3)
-
-**Merged pull requests:**
-
-- Reimplements PassyFire as a possible backend [\#4](https://github.com/imterah/nextnet/pull/4)
-
-
-
-\* *This Changelog was automatically generated by [github_changelog_generator](https://github.com/github-changelog-generator/github-changelog-generator)*

Dockerfile

@@ -7,4 +7,5 @@ WORKDIR /app
 COPY --from=build /build/backend/backends.prod.json /app/backends.json
 COPY --from=build /build/backend/api/api /app/hermes
 COPY --from=build /build/backend/sshbackend/sshbackend /app/sshbackend
+COPY --from=build /build/backend/sshappbackend/local-code/sshappbackend /app/sshappbackend
 ENTRYPOINT ["/app/hermes", "--backends-path", "/app/backends.json"]

LICENSE

@@ -1,6 +1,6 @@
 BSD 3-Clause License
 
-Copyright (c) 2024, Greyson
+Copyright (c) 2024, Tera
 
 Redistribution and use in source and binary forms, with or without
 modification, are permitted provided that the following conditions are met:

README.md

@@ -32,7 +32,7 @@
 
 1. Copy and change the default password (or username & db name too) from the template file `prod-docker.env`:
   ```bash
-  sed "s/POSTGRES_PASSWORD=hermes/POSTGRES_PASSWORD=$(head -c 500 /dev/random | sha512sum | cut -d " " -f 1)/g" prod-docker.env > .env
+  sed -e "s/POSTGRES_PASSWORD=hermes/POSTGRES_PASSWORD=$(head -c 500 /dev/random | sha512sum | cut -d " " -f 1)/g" -e "s/JWT_SECRET=hermes/JWT_SECRET=$(head -c 500 /dev/random | sha512sum | cut -d " " -f 1)/g" prod-docker.env > .env
   ```
 
 2. Build the docker stack: `docker compose --env-file .env up -d`

backend/api/backendruntime/core.go

@@ -6,10 +6,10 @@ var (
 	AvailableBackends []*Backend
 	RunningBackends   map[uint]*Runtime
 	TempDir           string
-	isDevelopmentMode bool
+	shouldLog         bool
 )
 
 func init() {
 	RunningBackends = make(map[uint]*Runtime)
-	isDevelopmentMode = os.Getenv("HERMES_DEVELOPMENT_MODE") != ""
+	shouldLog = os.Getenv("HERMES_DEVELOPMENT_MODE") != "" || os.Getenv("HERMES_BACKEND_LOGGING_ENABLED") != "" || os.Getenv("HERMES_LOG_LEVEL") == "debug"
 }

backend/api/backendruntime/runtime.go

@@ -15,8 +15,11 @@ import (
 	"github.com/charmbracelet/log"
 )
 
-func handleCommand(commandType string, command interface{}, sock net.Conn, rtcChan chan interface{}) error {
-	bytes, err := commonbackend.Marshal(commandType, command)
+// TODO TODO TODO(imterah):
+// This code is a mess. This NEEDS to be rearchitected and refactored to work better. Or at the very least, this code needs to be documented heavily.
+
+func handleCommand(command interface{}, sock net.Conn, rtcChan chan interface{}) error {
+	bytes, err := commonbackend.Marshal(command)
 
 	if err != nil {
 		log.Warnf("Failed to marshal message: %s", err.Error())
@@ -32,7 +35,7 @@ func handleCommand(commandType string, command interface{}, sock net.Conn, rtcCh
 		return fmt.Errorf("failed to write message: %s", err.Error())
 	}
 
-	_, data, err := commonbackend.Unmarshal(sock)
+	data, err := commonbackend.Unmarshal(sock)
 
 	if err != nil {
 		log.Warnf("Failed to unmarshal message: %s", err.Error())
@@ -117,9 +120,7 @@ func (runtime *Runtime) goRoutineHandler() error {
 					// To be safe here, we have to use the proper (yet annoying) facilities to prevent cross-talk, since we're in
 					// a goroutine, and can't talk directly. This actually has benefits, as the OuterLoop should exit on its own, if we
 					// encounter a critical error.
-					statusResponse, err := runtime.ProcessCommand(&commonbackend.BackendStatusRequest{
-						Type: "backendStatusRequest",
-					})
+					statusResponse, err := runtime.ProcessCommand(&commonbackend.BackendStatusRequest{})
 
 					if err != nil {
 						log.Warnf("Failed to get response for backend (in backend runtime keep alive): %s", err.Error())
@@ -162,14 +163,15 @@ func (runtime *Runtime) goRoutineHandler() error {
 
 		OuterLoop:
 			for {
+				_ = <-runtime.startProcessingNotification
+				runtime.isRuntimeCurrentlyProcessing = true
+
 				for chanIndex, messageData := range runtime.messageBuffer {
 					if messageData == nil {
 						continue
 					}
 
-					switch command := messageData.Message.(type) {
-					case *commonbackend.AddProxy:
-						err := handleCommand("addProxy", command, sock, messageData.Channel)
+					err := handleCommand(messageData.Message, sock, messageData.Channel)
 
 					if err != nil {
 						log.Warnf("failed to handle command in backend runtime instance: %s", err.Error())
@@ -178,103 +180,11 @@ func (runtime *Runtime) goRoutineHandler() error {
 							break OuterLoop
 						}
 					}
-					case *commonbackend.BackendStatusRequest:
-						err := handleCommand("backendStatusRequest", command, sock, messageData.Channel)
-
-						if err != nil {
-							log.Warnf("failed to handle command in backend runtime instance: %s", err.Error())
-
-							if strings.HasPrefix(err.Error(), "failed to write message") {
-								break OuterLoop
-							}
-						}
-					case *commonbackend.CheckClientParameters:
-						err := handleCommand("checkClientParameters", command, sock, messageData.Channel)
-
-						if err != nil {
-							log.Warnf("failed to handle command in backend runtime instance: %s", err.Error())
-
-							if strings.HasPrefix(err.Error(), "failed to write message") {
-								break OuterLoop
-							}
-						}
-					case *commonbackend.CheckServerParameters:
-						err := handleCommand("checkServerParameters", command, sock, messageData.Channel)
-
-						if err != nil {
-							log.Warnf("failed to handle command in backend runtime instance: %s", err.Error())
-
-							if strings.HasPrefix(err.Error(), "failed to write message") {
-								break OuterLoop
-							}
-						}
-					case *commonbackend.ProxyConnectionsRequest:
-						err := handleCommand("proxyConnectionsRequest", command, sock, messageData.Channel)
-
-						if err != nil {
-							log.Warnf("failed to handle command in backend runtime instance: %s", err.Error())
-
-							if strings.HasPrefix(err.Error(), "failed to write message") {
-								break OuterLoop
-							}
-						}
-					case *commonbackend.ProxyInstanceRequest:
-						err := handleCommand("proxyInstanceRequest", command, sock, messageData.Channel)
-
-						if err != nil {
-							log.Warnf("failed to handle command in backend runtime instance: %s", err.Error())
-
-							if strings.HasPrefix(err.Error(), "failed to write message") {
-								break OuterLoop
-							}
-						}
-					case *commonbackend.ProxyStatusRequest:
-						err := handleCommand("proxyStatusRequest", command, sock, messageData.Channel)
-
-						if err != nil {
-							log.Warnf("failed to handle command in backend runtime instance: %s", err.Error())
-
-							if strings.HasPrefix(err.Error(), "failed to write message") {
-								break OuterLoop
-							}
-						}
-					case *commonbackend.RemoveProxy:
-						err := handleCommand("removeProxy", command, sock, messageData.Channel)
-
-						if err != nil {
-							log.Warnf("failed to handle command in backend runtime instance: %s", err.Error())
-
-							if strings.HasPrefix(err.Error(), "failed to write message") {
-								break OuterLoop
-							}
-						}
-					case *commonbackend.Start:
-						err := handleCommand("start", command, sock, messageData.Channel)
-
-						if err != nil {
-							log.Warnf("failed to handle command in backend runtime instance: %s", err.Error())
-
-							if strings.HasPrefix(err.Error(), "failed to write message") {
-								break OuterLoop
-							}
-						}
-					case *commonbackend.Stop:
-						err := handleCommand("stop", command, sock, messageData.Channel)
-
-						if err != nil {
-							log.Warnf("failed to handle command in backend runtime instance: %s", err.Error())
-
-							if strings.HasPrefix(err.Error(), "failed to write message") {
-								break OuterLoop
-							}
-						}
-					default:
-						log.Warnf("Recieved unknown command type from channel: %T", command)
-						messageData.Channel <- fmt.Errorf("unknown command recieved")
-					}
 
 					runtime.messageBuffer[chanIndex] = nil
 				}
+
+				runtime.isRuntimeCurrentlyProcessing = false
 			}
 
 			sock.Close()
@@ -333,6 +243,7 @@ func (runtime *Runtime) Start() error {
 	runtime.messageBuffer = make([]*messageForBuf, 10)
 	runtime.messageBufferLock = sync.Mutex{}
 
+	runtime.startProcessingNotification = make(chan bool)
 	runtime.processRestartNotification = make(chan bool, 1)
 
 	runtime.logger = &writeLogger{
@@ -420,6 +331,10 @@ SchedulingLoop:
 		schedulingAttempts++
 	}
 
+	if !runtime.isRuntimeCurrentlyProcessing {
+		runtime.startProcessingNotification <- true
+	}
+
 	// Fetch response and close Channel
 	response, ok := <-commandChannel
 

backend/api/backendruntime/struct.go

@@ -16,11 +16,14 @@ type Backend struct {
 
 type messageForBuf struct {
 	Channel chan interface{}
+	// TODO(imterah): could this be refactored to just be a []byte instead? Look into this
 	Message interface{}
 }
 
 type Runtime struct {
 	isRuntimeRunning             bool
+	isRuntimeCurrentlyProcessing bool
+	startProcessingNotification  chan bool
 	logger                       *writeLogger
 	currentProcess               *exec.Cmd
 	currentListener              net.Listener
@@ -42,7 +45,7 @@ type writeLogger struct {
 func (writer writeLogger) Write(p []byte) (n int, err error) {
 	logSplit := strings.Split(string(p), "\n")
 
-	if isDevelopmentMode {
+	if shouldLog {
 		for _, logLine := range logSplit {
 			if logLine == "" {
 				continue

backend/api/backup.go

@@ -1,298 +0,0 @@
-package main
-
-import (
-	"compress/gzip"
-	"encoding/base64"
-	"encoding/json"
-	"fmt"
-	"io"
-	"os"
-	"strings"
-
-	"git.terah.dev/imterah/hermes/backend/api/dbcore"
-	"github.com/charmbracelet/log"
-	"github.com/go-playground/validator/v10"
-	"github.com/urfave/cli/v2"
-	"gorm.io/gorm"
-)
-
-// Data structures
-type BackupBackend struct {
-	ID uint `json:"id" validate:"required"`
-
-	Name              string  `json:"name" validate:"required"`
-	Description       *string `json:"description"`
-	Backend           string  `json:"backend" validate:"required"`
-	BackendParameters string  `json:"connectionDetails" validate:"required"`
-}
-
-type BackupProxy struct {
-	ID        uint `json:"id" validate:"required"`
-	BackendID uint `json:"destProviderID" validate:"required"`
-
-	Name            string  `json:"name" validate:"required"`
-	Description     *string `json:"description"`
-	Protocol        string  `json:"protocol" validate:"required"`
-	SourceIP        string  `json:"sourceIP" validate:"required"`
-	SourcePort      uint16  `json:"sourcePort" validate:"required"`
-	DestinationPort uint16  `json:"destPort" validate:"required"`
-	AutoStart       bool    `json:"enabled" validate:"required"`
-}
-
-type BackupPermission struct {
-	ID uint `json:"id" validate:"required"`
-
-	PermissionNode string `json:"permission" validate:"required"`
-	HasPermission  bool   `json:"has" validate:"required"`
-	UserID         uint   `json:"userID" validate:"required"`
-}
-
-type BackupUser struct {
-	ID uint `json:"id" validate:"required"`
-
-	Email    string  `json:"email" validate:"required"`
-	Username *string `json:"username"`
-	Name     string  `json:"name" validate:"required"`
-	Password string  `json:"password" validate:"required"`
-	IsBot    *bool   `json:"isRootServiceAccount"`
-
-	Token *string `json:"rootToken" validate:"required"`
-}
-
-type BackupData struct {
-	Backends    []*BackupBackend    `json:"destinationProviders" validate:"required"`
-	Proxies     []*BackupProxy      `json:"forwardRules" validate:"required"`
-	Permissions []*BackupPermission `json:"allPermissions" validate:"required"`
-	Users       []*BackupUser       `json:"users" validate:"required"`
-}
-
-// From https://stackoverflow.com/questions/54461423/efficient-way-to-remove-all-non-alphanumeric-characters-from-large-text
-// Strips all alphanumeric characters from a string
-func stripAllAlphanumeric(s string) string {
-	var result strings.Builder
-
-	for i := 0; i < len(s); i++ {
-		b := s[i]
-		if ('a' <= b && b <= 'z') ||
-			('A' <= b && b <= 'Z') ||
-			('0' <= b && b <= '9') {
-			result.WriteByte(b)
-		} else {
-			result.WriteByte('_')
-		}
-	}
-
-	return result.String()
-}
-
-func backupRestoreEntrypoint(cCtx *cli.Context) error {
-	log.Info("Decompressing backup...")
-
-	backupFile, err := os.Open(cCtx.String("backup-path"))
-
-	if err != nil {
-		return fmt.Errorf("failed to open backup: %s", err.Error())
-	}
-
-	reader, err := gzip.NewReader(backupFile)
-
-	if err != nil {
-		return fmt.Errorf("failed to initialize Gzip (compression) reader: %s", err.Error())
-	}
-
-	backupDataBytes, err := io.ReadAll(reader)
-
-	if err != nil {
-		return fmt.Errorf("failed to read backup contents: %s", err.Error())
-	}
-
-	log.Info("Decompressed backup. Cleaning up...")
-
-	err = reader.Close()
-
-	if err != nil {
-		return fmt.Errorf("failed to close Gzip reader: %s", err.Error())
-	}
-
-	err = backupFile.Close()
-
-	if err != nil {
-		return fmt.Errorf("failed to close backup: %s", err.Error())
-	}
-
-	log.Info("Parsing backup into internal structures...")
-
-	backupData := &BackupData{}
-
-	err = json.Unmarshal(backupDataBytes, backupData)
-
-	if err != nil {
-		return fmt.Errorf("failed to parse backup: %s", err.Error())
-	}
-
-	if err := validator.New().Struct(backupData); err != nil {
-		return fmt.Errorf("failed to validate backup: %s", err.Error())
-	}
-
-	log.Info("Initializing database and opening it...")
-
-	err = dbcore.InitializeDatabase(&gorm.Config{})
-
-	if err != nil {
-		log.Fatalf("Failed to initialize database: %s", err)
-	}
-
-	log.Info("Running database migrations...")
-
-	if err := dbcore.DoDatabaseMigrations(dbcore.DB); err != nil {
-		return fmt.Errorf("Failed to run database migrations: %s", err)
-	}
-
-	log.Info("Restoring database...")
-	bestEffortOwnerUIDFromBackup := -1
-
-	log.Info("Attempting to find user to use as owner of resources...")
-
-	for _, user := range backupData.Users {
-		foundUser := false
-		failedAdministrationCheck := false
-
-		for _, permission := range backupData.Permissions {
-			if permission.UserID != user.ID {
-				continue
-			}
-
-			foundUser = true
-
-			if !strings.HasPrefix(permission.PermissionNode, "routes.") && permission.PermissionNode != "permissions.see" && !permission.HasPermission {
-				log.Infof("User with email '%s' and ID of '%d' failed administration check (lacks all permissions required). Attempting to find better user", user.Email, user.ID)
-				failedAdministrationCheck = true
-
-				break
-			}
-		}
-
-		if !foundUser {
-			log.Warnf("User with email '%s' and ID of '%d' lacks any permissions!", user.Email, user.ID)
-			continue
-		}
-
-		if failedAdministrationCheck {
-			continue
-		}
-
-		log.Infof("Using user with email '%s', and ID of '%d'", user.Email, user.ID)
-		bestEffortOwnerUIDFromBackup = int(user.ID)
-
-		break
-	}
-
-	if bestEffortOwnerUIDFromBackup == -1 {
-		log.Warnf("Could not find Administrative level user to use as the owner of resources. Using user with email '%s', and ID of '%d'", backupData.Users[0].Email, backupData.Users[0].ID)
-		bestEffortOwnerUIDFromBackup = int(backupData.Users[0].ID)
-	}
-
-	var bestEffortOwnerUID uint
-
-	for _, user := range backupData.Users {
-		log.Infof("Migrating user with email '%s' and ID of '%d'", user.Email, user.ID)
-		tokens := make([]dbcore.Token, 0)
-		permissions := make([]dbcore.Permission, 0)
-
-		if user.Token != nil {
-			tokens = append(tokens, dbcore.Token{
-				Token:          *user.Token,
-				DisableExpiry:  true,
-				CreationIPAddr: "127.0.0.1", // We don't know the creation IP address...
-			})
-		}
-
-		for _, permission := range backupData.Permissions {
-			if permission.UserID != user.ID {
-				continue
-			}
-
-			permissions = append(permissions, dbcore.Permission{
-				PermissionNode: permission.PermissionNode,
-				HasPermission:  permission.HasPermission,
-			})
-		}
-
-		username := ""
-
-		if user.Username == nil {
-			username = strings.ToLower(stripAllAlphanumeric(user.Email))
-			log.Warnf("User with ID of '%d' doesn't have a username. Derived username from email is '%s' (email is '%s')", user.ID, username, user.Email)
-		} else {
-			username = *user.Username
-		}
-
-		userDatabase := &dbcore.User{
-			Email:    user.Email,
-			Username: username,
-			Name:     user.Name,
-			Password: base64.StdEncoding.EncodeToString([]byte(user.Password)),
-			IsBot:    user.IsBot,
-
-			Tokens:      tokens,
-			Permissions: permissions,
-		}
-
-		if err := dbcore.DB.Create(userDatabase).Error; err != nil {
-			log.Errorf("Failed to create user: %s", err.Error())
-			continue
-		}
-
-		if uint(bestEffortOwnerUIDFromBackup) == user.ID {
-			bestEffortOwnerUID = userDatabase.ID
-		}
-	}
-
-	for _, backend := range backupData.Backends {
-		log.Infof("Migrating backend ID '%d' with name '%s'", backend.ID, backend.Name)
-
-		backendDatabase := &dbcore.Backend{
-			UserID:            bestEffortOwnerUID,
-			Name:              backend.Name,
-			Description:       backend.Description,
-			Backend:           backend.Backend,
-			BackendParameters: base64.StdEncoding.EncodeToString([]byte(backend.BackendParameters)),
-		}
-
-		if err := dbcore.DB.Create(backendDatabase).Error; err != nil {
-			log.Errorf("Failed to create backend: %s", err.Error())
-			continue
-		}
-
-		log.Infof("Migrating proxies for backend ID '%d'", backend.ID)
-
-		for _, proxy := range backupData.Proxies {
-			if proxy.BackendID != backend.ID {
-				continue
-			}
-
-			log.Infof("Migrating proxy ID '%d' with name '%s'", proxy.ID, proxy.Name)
-
-			proxyDatabase := &dbcore.Proxy{
-				BackendID: backendDatabase.ID,
-				UserID:    bestEffortOwnerUID,
-
-				Name:            proxy.Name,
-				Description:     proxy.Description,
-				Protocol:        proxy.Protocol,
-				SourceIP:        proxy.SourceIP,
-				SourcePort:      proxy.SourcePort,
-				DestinationPort: proxy.DestinationPort,
-				AutoStart:       proxy.AutoStart,
-			}
-
-			if err := dbcore.DB.Create(proxyDatabase).Error; err != nil {
-				log.Errorf("Failed to create proxy: %s", err.Error())
-			}
-		}
-	}
-
-	log.Info("Successfully upgraded to Hermes from NextNet.")
-
-	return nil
-}

backend/api/controllers/v1/backends/create.go

@@ -7,13 +7,12 @@ import (
 	"net/http"
 
 	"git.terah.dev/imterah/hermes/backend/api/backendruntime"
-	"git.terah.dev/imterah/hermes/backend/api/dbcore"
-	"git.terah.dev/imterah/hermes/backend/api/jwtcore"
+	"git.terah.dev/imterah/hermes/backend/api/db"
 	"git.terah.dev/imterah/hermes/backend/api/permissions"
+	"git.terah.dev/imterah/hermes/backend/api/state"
 	"git.terah.dev/imterah/hermes/backend/commonbackend"
 	"github.com/charmbracelet/log"
 	"github.com/gin-gonic/gin"
-	"github.com/go-playground/validator/v10"
 )
 
 type BackendCreationRequest struct {
@@ -24,7 +23,8 @@ type BackendCreationRequest struct {
 	BackendParameters interface{} `json:"connectionDetails" validate:"required"`
 }
 
-func CreateBackend(c *gin.Context) {
+func SetupCreateBackend(state *state.State) {
+	state.Engine.POST("/api/v1/backends/create", func(c *gin.Context) {
 		var req BackendCreationRequest
 
 		if err := c.BindJSON(&req); err != nil {
@@ -35,7 +35,7 @@ func CreateBackend(c *gin.Context) {
 			return
 		}
 
-	if err := validator.New().Struct(&req); err != nil {
+		if err := state.Validator.Struct(&req); err != nil {
 			c.JSON(http.StatusBadRequest, gin.H{
 				"error": fmt.Sprintf("Failed to validate body: %s", err.Error()),
 			})
@@ -43,7 +43,7 @@ func CreateBackend(c *gin.Context) {
 			return
 		}
 
-	user, err := jwtcore.GetUserFromJWT(req.Token)
+		user, err := state.JWT.GetUserFromJWT(req.Token)
 
 		if err != nil {
 			if err.Error() == "token is expired" || err.Error() == "user does not exist" {
@@ -126,7 +126,6 @@ func CreateBackend(c *gin.Context) {
 		}
 
 		backendParamCheckResponse, err := backend.ProcessCommand(&commonbackend.CheckServerParameters{
-		Type:      "checkServerParameters",
 			Arguments: backendParameters,
 		})
 
@@ -191,7 +190,7 @@ func CreateBackend(c *gin.Context) {
 
 		log.Info("Passed backend checks successfully")
 
-	backendInDatabase := &dbcore.Backend{
+		backendInDatabase := &db.Backend{
 			UserID:            user.ID,
 			Name:              req.Name,
 			Description:       req.Description,
@@ -199,7 +198,7 @@ func CreateBackend(c *gin.Context) {
 			BackendParameters: base64.StdEncoding.EncodeToString(backendParameters),
 		}
 
-	if result := dbcore.DB.Create(&backendInDatabase); result.Error != nil {
+		if result := state.DB.DB.Create(&backendInDatabase); result.Error != nil {
 			log.Warnf("Failed to create backend: %s", result.Error.Error())
 
 			err = backend.Stop()
@@ -216,7 +215,6 @@ func CreateBackend(c *gin.Context) {
 		}
 
 		backendStartResponse, err := backend.ProcessCommand(&commonbackend.Start{
-		Type:      "start",
 			Arguments: backendParameters,
 		})
 
@@ -268,4 +266,5 @@ func CreateBackend(c *gin.Context) {
 		c.JSON(http.StatusOK, gin.H{
 			"success": true,
 		})
+	})
 }

backend/api/controllers/v1/backends/lookup.go

@@ -7,12 +7,11 @@ import (
 	"strings"
 
 	"git.terah.dev/imterah/hermes/backend/api/backendruntime"
-	"git.terah.dev/imterah/hermes/backend/api/dbcore"
-	"git.terah.dev/imterah/hermes/backend/api/jwtcore"
+	"git.terah.dev/imterah/hermes/backend/api/db"
 	"git.terah.dev/imterah/hermes/backend/api/permissions"
+	"git.terah.dev/imterah/hermes/backend/api/state"
 	"github.com/charmbracelet/log"
 	"github.com/gin-gonic/gin"
-	"github.com/go-playground/validator/v10"
 )
 
 type BackendLookupRequest struct {
@@ -38,7 +37,8 @@ type LookupResponse struct {
 	Data    []*SanitizedBackend `json:"data"`
 }
 
-func LookupBackend(c *gin.Context) {
+func SetupLookupBackend(state *state.State) {
+	state.Engine.POST("/api/v1/backends/lookup", func(c *gin.Context) {
 		var req BackendLookupRequest
 
 		if err := c.BindJSON(&req); err != nil {
@@ -49,7 +49,7 @@ func LookupBackend(c *gin.Context) {
 			return
 		}
 
-	if err := validator.New().Struct(&req); err != nil {
+		if err := state.Validator.Struct(&req); err != nil {
 			c.JSON(http.StatusBadRequest, gin.H{
 				"error": fmt.Sprintf("Failed to validate body: %s", err.Error()),
 			})
@@ -57,7 +57,7 @@ func LookupBackend(c *gin.Context) {
 			return
 		}
 
-	user, err := jwtcore.GetUserFromJWT(req.Token)
+		user, err := state.JWT.GetUserFromJWT(req.Token)
 
 		if err != nil {
 			if err.Error() == "token is expired" || err.Error() == "user does not exist" {
@@ -85,7 +85,7 @@ func LookupBackend(c *gin.Context) {
 			return
 		}
 
-	backends := []dbcore.Backend{}
+		backends := []db.Backend{}
 		queryString := []string{}
 		queryParameters := []interface{}{}
 
@@ -109,7 +109,7 @@ func LookupBackend(c *gin.Context) {
 			queryParameters = append(queryParameters, req.Backend)
 		}
 
-	if err := dbcore.DB.Where(strings.Join(queryString, " AND "), queryParameters...).Find(&backends).Error; err != nil {
+		if err := state.DB.DB.Where(strings.Join(queryString, " AND "), queryParameters...).Find(&backends).Error; err != nil {
 			log.Warnf("Failed to get backends: %s", err.Error())
 
 			c.JSON(http.StatusInternalServerError, gin.H{
@@ -160,4 +160,5 @@ func LookupBackend(c *gin.Context) {
 			Success: true,
 			Data:    sanitizedBackends,
 		})
+	})
 }

backend/api/controllers/v1/backends/remove.go

@@ -5,12 +5,11 @@ import (
 	"net/http"
 
 	"git.terah.dev/imterah/hermes/backend/api/backendruntime"
-	"git.terah.dev/imterah/hermes/backend/api/dbcore"
-	"git.terah.dev/imterah/hermes/backend/api/jwtcore"
+	"git.terah.dev/imterah/hermes/backend/api/db"
 	"git.terah.dev/imterah/hermes/backend/api/permissions"
+	"git.terah.dev/imterah/hermes/backend/api/state"
 	"github.com/charmbracelet/log"
 	"github.com/gin-gonic/gin"
-	"github.com/go-playground/validator/v10"
 )
 
 type BackendRemovalRequest struct {
@@ -18,7 +17,8 @@ type BackendRemovalRequest struct {
 	BackendID uint   `json:"id" validate:"required"`
 }
 
-func RemoveBackend(c *gin.Context) {
+func SetupRemoveBackend(state *state.State) {
+	state.Engine.POST("/api/v1/backends/remove", func(c *gin.Context) {
 		var req BackendRemovalRequest
 
 		if err := c.BindJSON(&req); err != nil {
@@ -29,7 +29,7 @@ func RemoveBackend(c *gin.Context) {
 			return
 		}
 
-	if err := validator.New().Struct(&req); err != nil {
+		if err := state.Validator.Struct(&req); err != nil {
 			c.JSON(http.StatusBadRequest, gin.H{
 				"error": fmt.Sprintf("Failed to validate body: %s", err.Error()),
 			})
@@ -37,7 +37,7 @@ func RemoveBackend(c *gin.Context) {
 			return
 		}
 
-	user, err := jwtcore.GetUserFromJWT(req.Token)
+		user, err := state.JWT.GetUserFromJWT(req.Token)
 
 		if err != nil {
 			if err.Error() == "token is expired" || err.Error() == "user does not exist" {
@@ -65,8 +65,8 @@ func RemoveBackend(c *gin.Context) {
 			return
 		}
 
-	var backend *dbcore.Backend
-	backendRequest := dbcore.DB.Where("id = ?", req.BackendID).Find(&backend)
+		var backend *db.Backend
+		backendRequest := state.DB.DB.Where("id = ?", req.BackendID).Find(&backend)
 
 		if backendRequest.Error != nil {
 			log.Warnf("failed to find if backend exists or not: %s", backendRequest.Error.Error())
@@ -88,7 +88,7 @@ func RemoveBackend(c *gin.Context) {
 			return
 		}
 
-	if err := dbcore.DB.Delete(backend).Error; err != nil {
+		if err := state.DB.DB.Delete(backend).Error; err != nil {
 			log.Warnf("failed to delete backend: %s", err.Error())
 
 			c.JSON(http.StatusInternalServerError, gin.H{
@@ -120,4 +120,5 @@ func RemoveBackend(c *gin.Context) {
 		c.JSON(http.StatusOK, gin.H{
 			"success": true,
 		})
+	})
 }

backend/api/controllers/v1/proxies/connections.go

@@ -5,13 +5,12 @@ import (
 	"net/http"
 
 	"git.terah.dev/imterah/hermes/backend/api/backendruntime"
-	"git.terah.dev/imterah/hermes/backend/api/dbcore"
-	"git.terah.dev/imterah/hermes/backend/api/jwtcore"
+	"git.terah.dev/imterah/hermes/backend/api/db"
 	"git.terah.dev/imterah/hermes/backend/api/permissions"
+	"git.terah.dev/imterah/hermes/backend/api/state"
 	"git.terah.dev/imterah/hermes/backend/commonbackend"
 	"github.com/charmbracelet/log"
 	"github.com/gin-gonic/gin"
-	"github.com/go-playground/validator/v10"
 )
 
 type ConnectionsRequest struct {
@@ -37,7 +36,8 @@ type ConnectionsResponse struct {
 	Data    []*SanitizedConnection `json:"data"`
 }
 
-func GetConnections(c *gin.Context) {
+func SetupGetConnections(state *state.State) {
+	state.Engine.POST("/api/v1/forward/connections", func(c *gin.Context) {
 		var req ConnectionsRequest
 
 		if err := c.BindJSON(&req); err != nil {
@@ -48,7 +48,7 @@ func GetConnections(c *gin.Context) {
 			return
 		}
 
-	if err := validator.New().Struct(&req); err != nil {
+		if err := state.Validator.Struct(&req); err != nil {
 			c.JSON(http.StatusBadRequest, gin.H{
 				"error": fmt.Sprintf("Failed to validate body: %s", err.Error()),
 			})
@@ -56,7 +56,8 @@ func GetConnections(c *gin.Context) {
 			return
 		}
 
-	user, err := jwtcore.GetUserFromJWT(req.Token)
+		user, err := state.JWT.GetUserFromJWT(req.Token)
+
 		if err != nil {
 			if err.Error() == "token is expired" || err.Error() == "user does not exist" {
 				c.JSON(http.StatusForbidden, gin.H{
@@ -83,8 +84,8 @@ func GetConnections(c *gin.Context) {
 			return
 		}
 
-	var proxy dbcore.Proxy
-	proxyRequest := dbcore.DB.Where("id = ?", req.Id).First(&proxy)
+		var proxy db.Proxy
+		proxyRequest := state.DB.DB.Where("id = ?", req.Id).First(&proxy)
 
 		if proxyRequest.Error != nil {
 			log.Warnf("failed to find proxy: %s", proxyRequest.Error.Error())
@@ -118,9 +119,7 @@ func GetConnections(c *gin.Context) {
 			return
 		}
 
-	backendResponse, err := backendRuntime.ProcessCommand(&commonbackend.ProxyConnectionsRequest{
-		Type: "proxyConnectionsRequest",
-	})
+		backendResponse, err := backendRuntime.ProcessCommand(&commonbackend.ProxyConnectionsRequest{})
 
 		if err != nil {
 			log.Warnf("Failed to get response for backend: %s", err.Error())
@@ -162,4 +161,5 @@ func GetConnections(c *gin.Context) {
 				"error": "Got illegal response type",
 			})
 		}
+	})
 }

backend/api/controllers/v1/proxies/create.go

@@ -5,13 +5,12 @@ import (
 	"net/http"
 
 	"git.terah.dev/imterah/hermes/backend/api/backendruntime"
-	"git.terah.dev/imterah/hermes/backend/api/dbcore"
-	"git.terah.dev/imterah/hermes/backend/api/jwtcore"
+	"git.terah.dev/imterah/hermes/backend/api/db"
 	"git.terah.dev/imterah/hermes/backend/api/permissions"
+	"git.terah.dev/imterah/hermes/backend/api/state"
 	"git.terah.dev/imterah/hermes/backend/commonbackend"
 	"github.com/charmbracelet/log"
 	"github.com/gin-gonic/gin"
-	"github.com/go-playground/validator/v10"
 )
 
 type ProxyCreationRequest struct {
@@ -26,7 +25,8 @@ type ProxyCreationRequest struct {
 	AutoStart       *bool   `json:"autoStart"`
 }
 
-func CreateProxy(c *gin.Context) {
+func SetupCreateProxy(state *state.State) {
+	state.Engine.POST("/api/v1/forward/create", func(c *gin.Context) {
 		var req ProxyCreationRequest
 
 		if err := c.BindJSON(&req); err != nil {
@@ -37,7 +37,7 @@ func CreateProxy(c *gin.Context) {
 			return
 		}
 
-	if err := validator.New().Struct(&req); err != nil {
+		if err := state.Validator.Struct(&req); err != nil {
 			c.JSON(http.StatusBadRequest, gin.H{
 				"error": fmt.Sprintf("Failed to validate body: %s", err.Error()),
 			})
@@ -45,7 +45,8 @@ func CreateProxy(c *gin.Context) {
 			return
 		}
 
-	user, err := jwtcore.GetUserFromJWT(req.Token)
+		user, err := state.JWT.GetUserFromJWT(req.Token)
+
 		if err != nil {
 			if err.Error() == "token is expired" || err.Error() == "user does not exist" {
 				c.JSON(http.StatusForbidden, gin.H{
@@ -80,8 +81,8 @@ func CreateProxy(c *gin.Context) {
 			return
 		}
 
-	var backend dbcore.Backend
-	backendRequest := dbcore.DB.Where("id = ?", req.ProviderID).First(&backend)
+		var backend db.Backend
+		backendRequest := state.DB.DB.Where("id = ?", req.ProviderID).First(&backend)
 
 		if backendRequest.Error != nil {
 			log.Warnf("failed to find if backend exists or not: %s", backendRequest.Error.Error())
@@ -105,7 +106,7 @@ func CreateProxy(c *gin.Context) {
 			autoStart = *req.AutoStart
 		}
 
-	proxy := &dbcore.Proxy{
+		proxy := &db.Proxy{
 			UserID:          user.ID,
 			BackendID:       req.ProviderID,
 			Name:            req.Name,
@@ -117,7 +118,7 @@ func CreateProxy(c *gin.Context) {
 			AutoStart:       autoStart,
 		}
 
-	if result := dbcore.DB.Create(proxy); result.Error != nil {
+		if result := state.DB.DB.Create(proxy); result.Error != nil {
 			log.Warnf("failed to create proxy: %s", result.Error.Error())
 
 			c.JSON(http.StatusInternalServerError, gin.H{
@@ -142,7 +143,6 @@ func CreateProxy(c *gin.Context) {
 			}
 
 			backendResponse, err := backend.ProcessCommand(&commonbackend.AddProxy{
-			Type:       "addProxy",
 				SourceIP:   proxy.SourceIP,
 				SourcePort: proxy.SourcePort,
 				DestPort:   proxy.DestinationPort,
@@ -173,4 +173,5 @@ func CreateProxy(c *gin.Context) {
 			"success": true,
 			"id":      proxy.ID,
 		})
+	})
 }

backend/api/controllers/v1/proxies/lookup.go

@@ -5,12 +5,11 @@ import (
 	"net/http"
 	"strings"
 
-	"git.terah.dev/imterah/hermes/backend/api/dbcore"
-	"git.terah.dev/imterah/hermes/backend/api/jwtcore"
+	"git.terah.dev/imterah/hermes/backend/api/db"
 	"git.terah.dev/imterah/hermes/backend/api/permissions"
+	"git.terah.dev/imterah/hermes/backend/api/state"
 	"github.com/charmbracelet/log"
 	"github.com/gin-gonic/gin"
-	"github.com/go-playground/validator/v10"
 )
 
 type ProxyLookupRequest struct {
@@ -43,7 +42,8 @@ type ProxyLookupResponse struct {
 	Data    []*SanitizedProxy `json:"data"`
 }
 
-func LookupProxy(c *gin.Context) {
+func SetupLookupProxy(state *state.State) {
+	state.Engine.POST("/api/v1/forward/lookup", func(c *gin.Context) {
 		var req ProxyLookupRequest
 
 		if err := c.BindJSON(&req); err != nil {
@@ -54,7 +54,7 @@ func LookupProxy(c *gin.Context) {
 			return
 		}
 
-	if err := validator.New().Struct(&req); err != nil {
+		if err := state.Validator.Struct(&req); err != nil {
 			c.JSON(http.StatusBadRequest, gin.H{
 				"error": fmt.Sprintf("Failed to validate body: %s", err.Error()),
 			})
@@ -62,7 +62,7 @@ func LookupProxy(c *gin.Context) {
 			return
 		}
 
-	user, err := jwtcore.GetUserFromJWT(req.Token)
+		user, err := state.JWT.GetUserFromJWT(req.Token)
 
 		if err != nil {
 			if err.Error() == "token is expired" || err.Error() == "user does not exist" {
@@ -100,7 +100,7 @@ func LookupProxy(c *gin.Context) {
 			}
 		}
 
-	proxies := []dbcore.Proxy{}
+		proxies := []db.Proxy{}
 
 		queryString := []string{}
 		queryParameters := []interface{}{}
@@ -150,7 +150,7 @@ func LookupProxy(c *gin.Context) {
 			queryParameters = append(queryParameters, req.Protocol)
 		}
 
-	if err := dbcore.DB.Where(strings.Join(queryString, " AND "), queryParameters...).Find(&proxies).Error; err != nil {
+		if err := state.DB.DB.Where(strings.Join(queryString, " AND "), queryParameters...).Find(&proxies).Error; err != nil {
 			log.Warnf("failed to get proxies: %s", err.Error())
 
 			c.JSON(http.StatusInternalServerError, gin.H{
@@ -180,4 +180,5 @@ func LookupProxy(c *gin.Context) {
 			Success: true,
 			Data:    sanitizedProxies,
 		})
+	})
 }

backend/api/controllers/v1/proxies/remove.go

@@ -5,13 +5,12 @@ import (
 	"net/http"
 
 	"git.terah.dev/imterah/hermes/backend/api/backendruntime"
-	"git.terah.dev/imterah/hermes/backend/api/dbcore"
-	"git.terah.dev/imterah/hermes/backend/api/jwtcore"
+	"git.terah.dev/imterah/hermes/backend/api/db"
 	"git.terah.dev/imterah/hermes/backend/api/permissions"
+	"git.terah.dev/imterah/hermes/backend/api/state"
 	"git.terah.dev/imterah/hermes/backend/commonbackend"
 	"github.com/charmbracelet/log"
 	"github.com/gin-gonic/gin"
-	"github.com/go-playground/validator/v10"
 )
 
 type ProxyRemovalRequest struct {
@@ -19,7 +18,8 @@ type ProxyRemovalRequest struct {
 	ID    uint   `validate:"required" json:"id"`
 }
 
-func RemoveProxy(c *gin.Context) {
+func SetupRemoveProxy(state *state.State) {
+	state.Engine.POST("/api/v1/forward/remove", func(c *gin.Context) {
 		var req ProxyRemovalRequest
 
 		if err := c.BindJSON(&req); err != nil {
@@ -30,7 +30,7 @@ func RemoveProxy(c *gin.Context) {
 			return
 		}
 
-	if err := validator.New().Struct(&req); err != nil {
+		if err := state.Validator.Struct(&req); err != nil {
 			c.JSON(http.StatusBadRequest, gin.H{
 				"error": fmt.Sprintf("Failed to validate body: %s", err.Error()),
 			})
@@ -38,7 +38,8 @@ func RemoveProxy(c *gin.Context) {
 			return
 		}
 
-	user, err := jwtcore.GetUserFromJWT(req.Token)
+		user, err := state.JWT.GetUserFromJWT(req.Token)
+
 		if err != nil {
 			if err.Error() == "token is expired" || err.Error() == "user does not exist" {
 				c.JSON(http.StatusForbidden, gin.H{
@@ -65,8 +66,8 @@ func RemoveProxy(c *gin.Context) {
 			return
 		}
 
-	var proxy *dbcore.Proxy
-	proxyRequest := dbcore.DB.Where("id = ?", req.ID).Find(&proxy)
+		var proxy *db.Proxy
+		proxyRequest := state.DB.DB.Where("id = ?", req.ID).Find(&proxy)
 
 		if proxyRequest.Error != nil {
 			log.Warnf("failed to find if proxy exists or not: %s", proxyRequest.Error.Error())
@@ -88,7 +89,7 @@ func RemoveProxy(c *gin.Context) {
 			return
 		}
 
-	if err := dbcore.DB.Delete(proxy).Error; err != nil {
+		if err := state.DB.DB.Delete(proxy).Error; err != nil {
 			log.Warnf("failed to delete proxy: %s", err.Error())
 
 			c.JSON(http.StatusInternalServerError, gin.H{
@@ -111,7 +112,6 @@ func RemoveProxy(c *gin.Context) {
 		}
 
 		backendResponse, err := backend.ProcessCommand(&commonbackend.RemoveProxy{
-		Type:       "removeProxy",
 			SourceIP:   proxy.SourceIP,
 			SourcePort: proxy.SourcePort,
 			DestPort:   proxy.DestinationPort,
@@ -134,8 +134,10 @@ func RemoveProxy(c *gin.Context) {
 				c.JSON(http.StatusInternalServerError, gin.H{
 					"error": "Failed to stop proxy. Proxy was still successfully deleted",
 				})
-
-			return
+			} else {
+				c.JSON(http.StatusOK, gin.H{
+					"success": true,
+				})
 			}
 		default:
 			log.Errorf("Got illegal response type for backend #%d: %T", proxy.BackendID, responseMessage)
@@ -143,11 +145,6 @@ func RemoveProxy(c *gin.Context) {
 			c.JSON(http.StatusInternalServerError, gin.H{
 				"error": "Got invalid response from backend. Proxy was still successfully deleted",
 			})
-
-		return
 		}
-
-	c.JSON(http.StatusOK, gin.H{
-		"success": true,
 	})
 }

backend/api/controllers/v1/proxies/start.go

@@ -5,13 +5,12 @@ import (
 	"net/http"
 
 	"git.terah.dev/imterah/hermes/backend/api/backendruntime"
-	"git.terah.dev/imterah/hermes/backend/api/dbcore"
-	"git.terah.dev/imterah/hermes/backend/api/jwtcore"
+	"git.terah.dev/imterah/hermes/backend/api/db"
 	"git.terah.dev/imterah/hermes/backend/api/permissions"
+	"git.terah.dev/imterah/hermes/backend/api/state"
 	"git.terah.dev/imterah/hermes/backend/commonbackend"
 	"github.com/charmbracelet/log"
 	"github.com/gin-gonic/gin"
-	"github.com/go-playground/validator/v10"
 )
 
 type ProxyStartRequest struct {
@@ -19,7 +18,8 @@ type ProxyStartRequest struct {
 	ID    uint   `validate:"required" json:"id"`
 }
 
-func StartProxy(c *gin.Context) {
+func SetupStartProxy(state *state.State) {
+	state.Engine.POST("/api/v1/forward/start", func(c *gin.Context) {
 		var req ProxyStartRequest
 
 		if err := c.BindJSON(&req); err != nil {
@@ -30,7 +30,7 @@ func StartProxy(c *gin.Context) {
 			return
 		}
 
-	if err := validator.New().Struct(&req); err != nil {
+		if err := state.Validator.Struct(&req); err != nil {
 			c.JSON(http.StatusBadRequest, gin.H{
 				"error": fmt.Sprintf("Failed to validate body: %s", err.Error()),
 			})
@@ -38,7 +38,8 @@ func StartProxy(c *gin.Context) {
 			return
 		}
 
-	user, err := jwtcore.GetUserFromJWT(req.Token)
+		user, err := state.JWT.GetUserFromJWT(req.Token)
+
 		if err != nil {
 			if err.Error() == "token is expired" || err.Error() == "user does not exist" {
 				c.JSON(http.StatusForbidden, gin.H{
@@ -65,8 +66,8 @@ func StartProxy(c *gin.Context) {
 			return
 		}
 
-	var proxy *dbcore.Proxy
-	proxyRequest := dbcore.DB.Where("id = ?", req.ID).Find(&proxy)
+		var proxy *db.Proxy
+		proxyRequest := state.DB.DB.Where("id = ?", req.ID).Find(&proxy)
 
 		if proxyRequest.Error != nil {
 			log.Warnf("failed to find if proxy exists or not: %s", proxyRequest.Error.Error())
@@ -101,7 +102,6 @@ func StartProxy(c *gin.Context) {
 		}
 
 		backendResponse, err := backend.ProcessCommand(&commonbackend.AddProxy{
-		Type:       "addProxy",
 			SourceIP:   proxy.SourceIP,
 			SourcePort: proxy.SourcePort,
 			DestPort:   proxy.DestinationPort,
@@ -115,29 +115,22 @@ func StartProxy(c *gin.Context) {
 			c.JSON(http.StatusInternalServerError, gin.H{
 				"error": "failed to get response from backend",
 			})
-
-		return
 		case *commonbackend.ProxyStatusResponse:
 			if !responseMessage.IsActive {
 				c.JSON(http.StatusInternalServerError, gin.H{
 					"error": "failed to start proxy",
 				})
-
-			return
-		}
-
-		break
-	default:
-		log.Errorf("Got illegal response type for backend #%d: %T", proxy.BackendID, responseMessage)
-
-		c.JSON(http.StatusInternalServerError, gin.H{
-			"error": "Got invalid response from backend. Proxy was still successfully deleted",
-		})
-
-		return
-	}
-
+			} else {
 				c.JSON(http.StatusOK, gin.H{
 					"success": true,
 				})
 			}
+		default:
+			log.Errorf("Got illegal response type for backend #%d: %T", proxy.BackendID, responseMessage)
+
+			c.JSON(http.StatusInternalServerError, gin.H{
+				"error": "Got invalid response from backend. Proxy was likely still successfully started",
+			})
+		}
+	})
+}

backend/api/controllers/v1/proxies/stop.go

@@ -5,13 +5,12 @@ import (
 	"net/http"
 
 	"git.terah.dev/imterah/hermes/backend/api/backendruntime"
-	"git.terah.dev/imterah/hermes/backend/api/dbcore"
-	"git.terah.dev/imterah/hermes/backend/api/jwtcore"
+	"git.terah.dev/imterah/hermes/backend/api/db"
 	"git.terah.dev/imterah/hermes/backend/api/permissions"
+	"git.terah.dev/imterah/hermes/backend/api/state"
 	"git.terah.dev/imterah/hermes/backend/commonbackend"
 	"github.com/charmbracelet/log"
 	"github.com/gin-gonic/gin"
-	"github.com/go-playground/validator/v10"
 )
 
 type ProxyStopRequest struct {
@@ -19,8 +18,9 @@ type ProxyStopRequest struct {
 	ID    uint   `validate:"required" json:"id"`
 }
 
-func StopProxy(c *gin.Context) {
-	var req ProxyStopRequest
+func SetupStopProxy(state *state.State) {
+	state.Engine.POST("/api/v1/forward/stop", func(c *gin.Context) {
+		var req ProxyStartRequest
 
 		if err := c.BindJSON(&req); err != nil {
 			c.JSON(http.StatusBadRequest, gin.H{
@@ -30,7 +30,7 @@ func StopProxy(c *gin.Context) {
 			return
 		}
 
-	if err := validator.New().Struct(&req); err != nil {
+		if err := state.Validator.Struct(&req); err != nil {
 			c.JSON(http.StatusBadRequest, gin.H{
 				"error": fmt.Sprintf("Failed to validate body: %s", err.Error()),
 			})
@@ -38,7 +38,8 @@ func StopProxy(c *gin.Context) {
 			return
 		}
 
-	user, err := jwtcore.GetUserFromJWT(req.Token)
+		user, err := state.JWT.GetUserFromJWT(req.Token)
+
 		if err != nil {
 			if err.Error() == "token is expired" || err.Error() == "user does not exist" {
 				c.JSON(http.StatusForbidden, gin.H{
@@ -65,8 +66,8 @@ func StopProxy(c *gin.Context) {
 			return
 		}
 
-	var proxy *dbcore.Proxy
-	proxyRequest := dbcore.DB.Where("id = ?", req.ID).Find(&proxy)
+		var proxy *db.Proxy
+		proxyRequest := state.DB.DB.Where("id = ?", req.ID).Find(&proxy)
 
 		if proxyRequest.Error != nil {
 			log.Warnf("failed to find if proxy exists or not: %s", proxyRequest.Error.Error())
@@ -101,43 +102,35 @@ func StopProxy(c *gin.Context) {
 		}
 
 		backendResponse, err := backend.ProcessCommand(&commonbackend.RemoveProxy{
-		Type:       "removeProxy",
 			SourceIP:   proxy.SourceIP,
 			SourcePort: proxy.SourcePort,
 			DestPort:   proxy.DestinationPort,
 			Protocol:   proxy.Protocol,
 		})
 
-	if err != nil {
-		log.Warnf("Failed to get response for backend #%d: %s", proxy.BackendID, err.Error())
+		switch responseMessage := backendResponse.(type) {
+		case error:
+			log.Warnf("Failed to get response for backend #%d: %s", proxy.BackendID, responseMessage.Error())
 
 			c.JSON(http.StatusInternalServerError, gin.H{
 				"error": "failed to get response from backend",
 			})
-
-		return
-	}
-
-	switch responseMessage := backendResponse.(type) {
 		case *commonbackend.ProxyStatusResponse:
 			if responseMessage.IsActive {
 				c.JSON(http.StatusInternalServerError, gin.H{
 					"error": "failed to stop proxy",
 				})
-
-			return
+			} else {
+				c.JSON(http.StatusOK, gin.H{
+					"success": true,
+				})
 			}
 		default:
 			log.Errorf("Got illegal response type for backend #%d: %T", proxy.BackendID, responseMessage)
 
 			c.JSON(http.StatusInternalServerError, gin.H{
-			"error": "Got invalid response from backend. Proxy was still successfully deleted",
-		})
-
-		return
-	}
-
-	c.JSON(http.StatusOK, gin.H{
-		"success": true,
+				"error": "Got invalid response from backend. Proxy was likely still successfully stopped",
+			})
+		}
 	})
 }

backend/api/controllers/v1/users/create.go

@@ -7,11 +7,9 @@ import (
 	"net/http"
 	"strings"
 
-	"github.com/go-playground/validator/v10"
-
-	"git.terah.dev/imterah/hermes/backend/api/dbcore"
-	"git.terah.dev/imterah/hermes/backend/api/jwtcore"
+	"git.terah.dev/imterah/hermes/backend/api/db"
 	permissionHelper "git.terah.dev/imterah/hermes/backend/api/permissions"
+	"git.terah.dev/imterah/hermes/backend/api/state"
 	"github.com/charmbracelet/log"
 	"github.com/gin-gonic/gin"
 	"golang.org/x/crypto/bcrypt"
@@ -22,13 +20,11 @@ type UserCreationRequest struct {
 	Email    string `validate:"required"`
 	Password string `validate:"required"`
 	Username string `validate:"required"`
-
-	// TODO: implement support
-	ExistingUserToken string `json:"token"`
 	IsBot    bool
 }
 
-func CreateUser(c *gin.Context) {
+func SetupCreateUser(state *state.State) {
+	state.Engine.POST("/api/v1/users/create", func(c *gin.Context) {
 		if !signupEnabled && !unsafeSignup {
 			c.JSON(http.StatusForbidden, gin.H{
 				"error": "Signing up is not enabled at this time.",
@@ -47,7 +43,7 @@ func CreateUser(c *gin.Context) {
 			return
 		}
 
-	if err := validator.New().Struct(&req); err != nil {
+		if err := state.Validator.Struct(&req); err != nil {
 			c.JSON(http.StatusBadRequest, gin.H{
 				"error": fmt.Sprintf("Failed to validate body: %s", err.Error()),
 			})
@@ -55,8 +51,8 @@ func CreateUser(c *gin.Context) {
 			return
 		}
 
-	var user *dbcore.User
-	userRequest := dbcore.DB.Where("email = ? OR username = ?", req.Email, req.Username).Find(&user)
+		var user *db.User
+		userRequest := state.DB.DB.Where("email = ? OR username = ?", req.Email, req.Username).Find(&user)
 
 		if userRequest.Error != nil {
 			log.Warnf("failed to find if user exists or not: %s", userRequest.Error.Error())
@@ -90,7 +86,7 @@ func CreateUser(c *gin.Context) {
 			return
 		}
 
-	permissions := []dbcore.Permission{}
+		permissions := []db.Permission{}
 
 		for _, permission := range permissionHelper.DefaultPermissionNodes {
 			permissionEnabledState := false
@@ -99,7 +95,7 @@ func CreateUser(c *gin.Context) {
 				permissionEnabledState = true
 			}
 
-		permissions = append(permissions, dbcore.Permission{
+			permissions = append(permissions, db.Permission{
 				PermissionNode: permission,
 				HasPermission:  permissionEnabledState,
 			})
@@ -117,14 +113,14 @@ func CreateUser(c *gin.Context) {
 			return
 		}
 
-	user = &dbcore.User{
+		user = &db.User{
 			Email:       req.Email,
 			Username:    req.Username,
 			Name:        req.Name,
 			IsBot:       &req.IsBot,
 			Password:    base64.StdEncoding.EncodeToString(passwordHashed),
 			Permissions: permissions,
-		Tokens: []dbcore.Token{
+			Tokens: []db.Token{
 				{
 					Token:          base64.StdEncoding.EncodeToString(tokenRandomData),
 					DisableExpiry:  forceNoExpiryTokens,
@@ -133,7 +129,7 @@ func CreateUser(c *gin.Context) {
 			},
 		}
 
-	if result := dbcore.DB.Create(&user); result.Error != nil {
+		if result := state.DB.DB.Create(&user); result.Error != nil {
 			log.Warnf("Failed to create user: %s", result.Error.Error())
 
 			c.JSON(http.StatusInternalServerError, gin.H{
@@ -143,7 +139,7 @@ func CreateUser(c *gin.Context) {
 			return
 		}
 
-	jwt, err := jwtcore.Generate(user.ID)
+		jwt, err := state.JWT.Generate(user.ID)
 
 		if err != nil {
 			log.Warnf("Failed to generate JWT: %s", err.Error())
@@ -160,4 +156,5 @@ func CreateUser(c *gin.Context) {
 			"token":        jwt,
 			"refreshToken": base64.StdEncoding.EncodeToString(tokenRandomData),
 		})
+	})
 }

backend/api/controllers/v1/users/login.go

@@ -6,11 +6,10 @@ import (
 	"fmt"
 	"net/http"
 
-	"git.terah.dev/imterah/hermes/backend/api/dbcore"
-	"git.terah.dev/imterah/hermes/backend/api/jwtcore"
+	"git.terah.dev/imterah/hermes/backend/api/db"
+	"git.terah.dev/imterah/hermes/backend/api/state"
 	"github.com/charmbracelet/log"
 	"github.com/gin-gonic/gin"
-	"github.com/go-playground/validator/v10"
 	"golang.org/x/crypto/bcrypt"
 )
 
@@ -21,7 +20,8 @@ type UserLoginRequest struct {
 	Password string `validate:"required"`
 }
 
-func LoginUser(c *gin.Context) {
+func SetupLoginUser(state *state.State) {
+	state.Engine.POST("/api/v1/users/login", func(c *gin.Context) {
 		var req UserLoginRequest
 
 		if err := c.BindJSON(&req); err != nil {
@@ -32,7 +32,7 @@ func LoginUser(c *gin.Context) {
 			return
 		}
 
-	if err := validator.New().Struct(&req); err != nil {
+		if err := state.Validator.Struct(&req); err != nil {
 			c.JSON(http.StatusBadRequest, gin.H{
 				"error": fmt.Sprintf("Failed to validate body: %s", err.Error()),
 			})
@@ -61,8 +61,8 @@ func LoginUser(c *gin.Context) {
 			userFindRequest += "username = ?"
 		}
 
-	var user *dbcore.User
-	userRequest := dbcore.DB.Where(userFindRequest, userFindRequestArguments...).Find(&user)
+		var user *db.User
+		userRequest := state.DB.DB.Where(userFindRequest, userFindRequestArguments...).Find(&user)
 
 		if userRequest.Error != nil {
 			log.Warnf("failed to find if user exists or not: %s", userRequest.Error.Error())
@@ -119,7 +119,7 @@ func LoginUser(c *gin.Context) {
 			return
 		}
 
-	token := &dbcore.Token{
+		token := &db.Token{
 			UserID: user.ID,
 
 			Token:          base64.StdEncoding.EncodeToString(tokenRandomData),
@@ -127,7 +127,7 @@ func LoginUser(c *gin.Context) {
 			CreationIPAddr: c.ClientIP(),
 		}
 
-	if result := dbcore.DB.Create(&token); result.Error != nil {
+		if result := state.DB.DB.Create(&token); result.Error != nil {
 			log.Warnf("Failed to create user: %s", result.Error.Error())
 
 			c.JSON(http.StatusInternalServerError, gin.H{
@@ -137,7 +137,7 @@ func LoginUser(c *gin.Context) {
 			return
 		}
 
-	jwt, err := jwtcore.Generate(user.ID)
+		jwt, err := state.JWT.Generate(user.ID)
 
 		if err != nil {
 			log.Warnf("Failed to generate JWT: %s", err.Error())
@@ -154,4 +154,5 @@ func LoginUser(c *gin.Context) {
 			"token":        jwt,
 			"refreshToken": base64.StdEncoding.EncodeToString(tokenRandomData),
 		})
+	})
 }

backend/api/controllers/v1/users/lookup.go

@@ -5,12 +5,11 @@ import (
 	"net/http"
 	"strings"
 
-	"git.terah.dev/imterah/hermes/backend/api/dbcore"
-	"git.terah.dev/imterah/hermes/backend/api/jwtcore"
+	"git.terah.dev/imterah/hermes/backend/api/db"
 	"git.terah.dev/imterah/hermes/backend/api/permissions"
+	"git.terah.dev/imterah/hermes/backend/api/state"
 	"github.com/charmbracelet/log"
 	"github.com/gin-gonic/gin"
-	"github.com/go-playground/validator/v10"
 )
 
 type UserLookupRequest struct {
@@ -35,7 +34,8 @@ type LookupResponse struct {
 	Data    []*SanitizedUsers `json:"data"`
 }
 
-func LookupUser(c *gin.Context) {
+func SetupLookupUser(state *state.State) {
+	state.Engine.POST("/api/v1/users/lookup", func(c *gin.Context) {
 		var req UserLookupRequest
 
 		if err := c.BindJSON(&req); err != nil {
@@ -46,7 +46,7 @@ func LookupUser(c *gin.Context) {
 			return
 		}
 
-	if err := validator.New().Struct(&req); err != nil {
+		if err := state.Validator.Struct(&req); err != nil {
 			c.JSON(http.StatusBadRequest, gin.H{
 				"error": fmt.Sprintf("Failed to validate body: %s", err.Error()),
 			})
@@ -54,7 +54,7 @@ func LookupUser(c *gin.Context) {
 			return
 		}
 
-	user, err := jwtcore.GetUserFromJWT(req.Token)
+		user, err := state.JWT.GetUserFromJWT(req.Token)
 
 		if err != nil {
 			if err.Error() == "token is expired" || err.Error() == "user does not exist" {
@@ -74,7 +74,7 @@ func LookupUser(c *gin.Context) {
 			}
 		}
 
-	users := []dbcore.User{}
+		users := []db.User{}
 		queryString := []string{}
 		queryParameters := []interface{}{}
 
@@ -101,7 +101,7 @@ func LookupUser(c *gin.Context) {
 			queryParameters = append(queryParameters, req.IsBot)
 		}
 
-	if err := dbcore.DB.Where(strings.Join(queryString, " AND "), queryParameters...).Find(&users).Error; err != nil {
+		if err := state.DB.DB.Where(strings.Join(queryString, " AND "), queryParameters...).Find(&users).Error; err != nil {
 			log.Warnf("Failed to get users: %s", err.Error())
 
 			c.JSON(http.StatusInternalServerError, gin.H{
@@ -133,4 +133,5 @@ func LookupUser(c *gin.Context) {
 			Success: true,
 			Data:    sanitizedUsers,
 		})
+	})
 }

backend/api/controllers/v1/users/refresh.go

@@ -5,18 +5,18 @@ import (
 	"net/http"
 	"time"
 
-	"git.terah.dev/imterah/hermes/backend/api/dbcore"
-	"git.terah.dev/imterah/hermes/backend/api/jwtcore"
+	"git.terah.dev/imterah/hermes/backend/api/db"
+	"git.terah.dev/imterah/hermes/backend/api/state"
 	"github.com/charmbracelet/log"
 	"github.com/gin-gonic/gin"
-	"github.com/go-playground/validator/v10"
 )
 
 type UserRefreshRequest struct {
 	Token string `validate:"required"`
 }
 
-func RefreshUserToken(c *gin.Context) {
+func SetupRefreshUserToken(state *state.State) {
+	state.Engine.POST("/api/v1/users/refresh", func(c *gin.Context) {
 		var req UserRefreshRequest
 
 		if err := c.BindJSON(&req); err != nil {
@@ -27,7 +27,7 @@ func RefreshUserToken(c *gin.Context) {
 			return
 		}
 
-	if err := validator.New().Struct(&req); err != nil {
+		if err := state.Validator.Struct(&req); err != nil {
 			c.JSON(http.StatusBadRequest, gin.H{
 				"error": fmt.Sprintf("Failed to validate body: %s", err.Error()),
 			})
@@ -35,8 +35,8 @@ func RefreshUserToken(c *gin.Context) {
 			return
 		}
 
-	var tokenInDatabase *dbcore.Token
-	tokenRequest := dbcore.DB.Where("token = ?", req.Token).Find(&tokenInDatabase)
+		var tokenInDatabase *db.Token
+		tokenRequest := state.DB.DB.Where("token = ?", req.Token).Find(&tokenInDatabase)
 
 		if tokenRequest.Error != nil {
 			log.Warnf("failed to find if token exists or not: %s", tokenRequest.Error.Error())
@@ -65,7 +65,7 @@ func RefreshUserToken(c *gin.Context) {
 				"error": "Token has expired",
 			})
 
-		tx := dbcore.DB.Delete(tokenInDatabase)
+			tx := state.DB.DB.Delete(tokenInDatabase)
 
 			if tx.Error != nil {
 				log.Warnf("Failed to delete expired token from database: %s", tx.Error.Error())
@@ -75,8 +75,8 @@ func RefreshUserToken(c *gin.Context) {
 		}
 
 		// Get the user to check if the user exists before doing anything
-	var user *dbcore.User
-	userRequest := dbcore.DB.Where("id = ?", tokenInDatabase.UserID).Find(&user)
+		var user *db.User
+		userRequest := state.DB.DB.Where("id = ?", tokenInDatabase.UserID).Find(&user)
 
 		if tokenRequest.Error != nil {
 			log.Warnf("failed to find if token user or not: %s", userRequest.Error.Error())
@@ -98,7 +98,7 @@ func RefreshUserToken(c *gin.Context) {
 			return
 		}
 
-	jwt, err := jwtcore.Generate(user.ID)
+		jwt, err := state.JWT.Generate(user.ID)
 
 		if err != nil {
 			log.Warnf("Failed to generate JWT: %s", err.Error())
@@ -114,4 +114,5 @@ func RefreshUserToken(c *gin.Context) {
 			"success": true,
 			"token":   jwt,
 		})
+	})
 }

backend/api/controllers/v1/users/remove.go

@@ -4,12 +4,11 @@ import (
 	"fmt"
 	"net/http"
 
-	"git.terah.dev/imterah/hermes/backend/api/dbcore"
-	"git.terah.dev/imterah/hermes/backend/api/jwtcore"
+	"git.terah.dev/imterah/hermes/backend/api/db"
 	"git.terah.dev/imterah/hermes/backend/api/permissions"
+	"git.terah.dev/imterah/hermes/backend/api/state"
 	"github.com/charmbracelet/log"
 	"github.com/gin-gonic/gin"
-	"github.com/go-playground/validator/v10"
 )
 
 type UserRemovalRequest struct {
@@ -17,7 +16,8 @@ type UserRemovalRequest struct {
 	UID   *uint  `json:"uid"`
 }
 
-func RemoveUser(c *gin.Context) {
+func SetupRemoveUser(state *state.State) {
+	state.Engine.POST("/api/v1/users/remove", func(c *gin.Context) {
 		var req UserRemovalRequest
 
 		if err := c.BindJSON(&req); err != nil {
@@ -28,7 +28,7 @@ func RemoveUser(c *gin.Context) {
 			return
 		}
 
-	if err := validator.New().Struct(&req); err != nil {
+		if err := state.Validator.Struct(&req); err != nil {
 			c.JSON(http.StatusBadRequest, gin.H{
 				"error": fmt.Sprintf("Failed to validate body: %s", err.Error()),
 			})
@@ -36,7 +36,7 @@ func RemoveUser(c *gin.Context) {
 			return
 		}
 
-	user, err := jwtcore.GetUserFromJWT(req.Token)
+		user, err := state.JWT.GetUserFromJWT(req.Token)
 
 		if err != nil {
 			if err.Error() == "token is expired" || err.Error() == "user does not exist" {
@@ -73,8 +73,8 @@ func RemoveUser(c *gin.Context) {
 		// Make sure the user exists first if we have a custom UserID
 
 		if uid != user.ID {
-		var customUser *dbcore.User
-		userRequest := dbcore.DB.Where("id = ?", uid).Find(customUser)
+			var customUser *db.User
+			userRequest := state.DB.DB.Where("id = ?", uid).Find(customUser)
 
 			if userRequest.Error != nil {
 				log.Warnf("failed to find if user exists or not: %s", userRequest.Error.Error())
@@ -97,9 +97,10 @@ func RemoveUser(c *gin.Context) {
 			}
 		}
 
-	dbcore.DB.Select("Tokens", "Permissions", "Proxys", "Backends").Where("id = ?", uid).Delete(user)
+		state.DB.DB.Select("Tokens", "Permissions", "Proxys", "Backends").Where("id = ?", uid).Delete(user)
 
 		c.JSON(http.StatusOK, gin.H{
 			"success": true,
 		})
+	})
 }

backend/api/db/db.go

@@ -0,0 +1,77 @@
+package db
+
+import (
+	"fmt"
+	"os"
+
+	"gorm.io/driver/postgres"
+	"gorm.io/driver/sqlite"
+	"gorm.io/gorm"
+)
+
+type DB struct {
+	DB *gorm.DB
+}
+
+func New(backend, params string) (*DB, error) {
+	var err error
+
+	dialector, err := initDialector(backend, params)
+
+	if err != nil {
+		return nil, fmt.Errorf("failed to initialize physical database: %s", err)
+	}
+
+	database, err := gorm.Open(dialector)
+
+	if err != nil {
+		return nil, fmt.Errorf("failed to open database: %s", err)
+	}
+
+	return &DB{DB: database}, nil
+}
+
+func (db *DB) DoMigrations() error {
+	if err := db.DB.AutoMigrate(&Proxy{}); err != nil {
+		return err
+	}
+
+	if err := db.DB.AutoMigrate(&Backend{}); err != nil {
+		return err
+	}
+
+	if err := db.DB.AutoMigrate(&Permission{}); err != nil {
+		return err
+	}
+
+	if err := db.DB.AutoMigrate(&Token{}); err != nil {
+		return err
+	}
+
+	if err := db.DB.AutoMigrate(&User{}); err != nil {
+		return err
+	}
+
+	return nil
+}
+
+func initDialector(backend, params string) (gorm.Dialector, error) {
+	switch backend {
+	case "sqlite":
+		if params == "" {
+			return nil, fmt.Errorf("sqlite database file not specified")
+		}
+
+		return sqlite.Open(params), nil
+	case "postgresql":
+		if params == "" {
+			return nil, fmt.Errorf("postgres DSN not specified")
+		}
+
+		return postgres.Open(params), nil
+	case "":
+		return nil, fmt.Errorf("no database backend specified in environment variables")
+	default:
+		return nil, fmt.Errorf("unknown database backend specified: %s", os.Getenv(backend))
+	}
+}

backend/api/db/models.go

@@ -0,0 +1,66 @@
+package db
+
+import (
+	"gorm.io/gorm"
+)
+
+type Backend struct {
+	gorm.Model
+
+	UserID uint
+
+	Name              string
+	Description       *string
+	Backend           string
+	BackendParameters string
+
+	Proxies []Proxy
+}
+
+type Proxy struct {
+	gorm.Model
+
+	BackendID uint
+	UserID    uint
+
+	Name            string
+	Description     *string
+	Protocol        string
+	SourceIP        string
+	SourcePort      uint16
+	DestinationPort uint16
+	AutoStart       bool
+}
+
+type Permission struct {
+	gorm.Model
+
+	PermissionNode string
+	HasPermission  bool
+	UserID         uint
+}
+
+type Token struct {
+	gorm.Model
+
+	UserID uint
+
+	Token          string
+	DisableExpiry  bool
+	CreationIPAddr string
+}
+
+type User struct {
+	gorm.Model
+
+	Email    string `gorm:"unique"`
+	Username string `gorm:"unique"`
+	Name     string
+	Password string
+	IsBot    *bool
+
+	Permissions   []Permission
+	OwnedProxies  []Proxy
+	OwnedBackends []Backend
+	Tokens        []Token
+}

backend/api/dbcore/db.go

@@ -1,142 +0,0 @@
-package dbcore
-
-import (
-	"fmt"
-	"os"
-
-	"gorm.io/driver/postgres"
-	"gorm.io/driver/sqlite"
-	"gorm.io/gorm"
-)
-
-type Backend struct {
-	gorm.Model
-
-	UserID uint
-
-	Name              string
-	Description       *string
-	Backend           string
-	BackendParameters string
-
-	Proxies []Proxy
-}
-
-type Proxy struct {
-	gorm.Model
-
-	BackendID uint
-	UserID    uint
-
-	Name            string
-	Description     *string
-	Protocol        string
-	SourceIP        string
-	SourcePort      uint16
-	DestinationPort uint16
-	AutoStart       bool
-}
-
-type Permission struct {
-	gorm.Model
-
-	PermissionNode string
-	HasPermission  bool
-	UserID         uint
-}
-
-type Token struct {
-	gorm.Model
-
-	UserID uint
-
-	Token          string
-	DisableExpiry  bool
-	CreationIPAddr string
-}
-
-type User struct {
-	gorm.Model
-
-	Email    string `gorm:"unique"`
-	Username string `gorm:"unique"`
-	Name     string
-	Password string
-	IsBot    *bool
-
-	Permissions   []Permission
-	OwnedProxies  []Proxy
-	OwnedBackends []Backend
-	Tokens        []Token
-}
-
-var DB *gorm.DB
-
-func InitializeDatabaseDialector() (gorm.Dialector, error) {
-	databaseBackend := os.Getenv("HERMES_DATABASE_BACKEND")
-
-	switch databaseBackend {
-	case "sqlite":
-		filePath := os.Getenv("HERMES_SQLITE_FILEPATH")
-
-		if filePath == "" {
-			return nil, fmt.Errorf("sqlite database file not specified (missing HERMES_SQLITE_FILEPATH)")
-		}
-
-		return sqlite.Open(filePath), nil
-	case "postgresql":
-		postgresDSN := os.Getenv("HERMES_POSTGRES_DSN")
-
-		if postgresDSN == "" {
-			return nil, fmt.Errorf("postgres DSN not specified (missing HERMES_POSTGRES_DSN)")
-		}
-
-		return postgres.Open(postgresDSN), nil
-	case "":
-		return nil, fmt.Errorf("no database backend specified in environment variables (missing HERMES_DATABASE_BACKEND)")
-	default:
-		return nil, fmt.Errorf("unknown database backend specified: %s", os.Getenv(databaseBackend))
-	}
-}
-
-func InitializeDatabase(config *gorm.Config) error {
-	var err error
-
-	dialector, err := InitializeDatabaseDialector()
-
-	if err != nil {
-		return fmt.Errorf("failed to initialize physical database: %s", err)
-	}
-
-	DB, err = gorm.Open(dialector, config)
-
-	if err != nil {
-		return fmt.Errorf("failed to open database: %s", err)
-	}
-
-	return nil
-}
-
-func DoDatabaseMigrations(db *gorm.DB) error {
-	if err := db.AutoMigrate(&Proxy{}); err != nil {
-		return err
-	}
-
-	if err := db.AutoMigrate(&Backend{}); err != nil {
-		return err
-	}
-
-	if err := db.AutoMigrate(&Permission{}); err != nil {
-		return err
-	}
-
-	if err := db.AutoMigrate(&Token{}); err != nil {
-		return err
-	}
-
-	if err := db.AutoMigrate(&User{}); err != nil {
-		return err
-	}
-
-	return nil
-}

backend/api/jwt/jwt.go

@@ -0,0 +1,107 @@
+package jwt
+
+import (
+	"errors"
+	"fmt"
+	"strconv"
+	"time"
+
+	"git.terah.dev/imterah/hermes/backend/api/db"
+	"github.com/golang-jwt/jwt/v5"
+)
+
+var (
+	DevelopmentModeTimings = time.Duration(60*24) * time.Minute
+	NormalModeTimings      = time.Duration(3) * time.Minute
+)
+
+type JWTCore struct {
+	Key            []byte
+	Database       *db.DB
+	TimeMultiplier time.Duration
+}
+
+func New(key []byte, database *db.DB, timeMultiplier time.Duration) *JWTCore {
+	jwtCore := &JWTCore{
+		Key:            key,
+		Database:       database,
+		TimeMultiplier: timeMultiplier,
+	}
+
+	return jwtCore
+}
+
+func (jwtCore *JWTCore) Parse(tokenString string, options ...jwt.ParserOption) (*jwt.Token, error) {
+	return jwt.Parse(tokenString, jwtCore.jwtKeyCallback, options...)
+}
+
+func (jwtCore *JWTCore) GetUserFromJWT(token string) (*db.User, error) {
+	if jwtCore.Database == nil {
+		return nil, fmt.Errorf("database is not initialized")
+	}
+
+	parsedJWT, err := jwtCore.Parse(token)
+
+	if err != nil {
+		if errors.Is(err, jwt.ErrTokenExpired) {
+			return nil, fmt.Errorf("token is expired")
+		} else {
+			return nil, err
+		}
+	}
+
+	audience, err := parsedJWT.Claims.GetAudience()
+
+	if err != nil {
+		return nil, err
+	}
+
+	if len(audience) < 1 {
+		return nil, fmt.Errorf("audience is too small")
+	}
+
+	uid, err := strconv.Atoi(audience[0])
+
+	if err != nil {
+		return nil, err
+	}
+
+	user := &db.User{}
+	userRequest := jwtCore.Database.DB.Preload("Permissions").Where("id = ?", uint(uid)).Find(&user)
+
+	if userRequest.Error != nil {
+		return user, fmt.Errorf("failed to find if user exists or not: %s", userRequest.Error.Error())
+	}
+
+	userExists := userRequest.RowsAffected > 0
+
+	if !userExists {
+		return user, fmt.Errorf("user does not exist")
+	}
+
+	return user, nil
+}
+
+func (jwtCore *JWTCore) Generate(uid uint) (string, error) {
+	currentJWTTime := jwt.NewNumericDate(time.Now())
+
+	token := jwt.NewWithClaims(jwt.SigningMethodHS256, jwt.RegisteredClaims{
+		ExpiresAt: jwt.NewNumericDate(time.Now().Add(jwtCore.TimeMultiplier)),
+		IssuedAt:  currentJWTTime,
+		NotBefore: currentJWTTime,
+		// Convert the user ID to a string, and then set it as the audience parameters only value (there's only 1 user per key)
+		Audience: []string{strconv.Itoa(int(uid))},
+	})
+
+	signedToken, err := token.SignedString(jwtCore.Key)
+
+	if err != nil {
+		return "", err
+	}
+
+	return signedToken, nil
+}
+
+func (jwtCore *JWTCore) jwtKeyCallback(*jwt.Token) (any, error) {
+	return jwtCore.Key, nil
+}

backend/api/jwtcore/jwt.go

@@ -1,117 +0,0 @@
-package jwtcore
-
-import (
-	"encoding/base64"
-	"errors"
-	"fmt"
-	"os"
-	"strconv"
-	"time"
-
-	"git.terah.dev/imterah/hermes/backend/api/dbcore"
-	"github.com/golang-jwt/jwt/v5"
-)
-
-var (
-	JWTKey          []byte
-	developmentMode bool
-)
-
-func SetupJWT() error {
-	var err error
-	jwtDataString := os.Getenv("HERMES_JWT_SECRET")
-
-	if jwtDataString == "" {
-		return fmt.Errorf("JWT secret isn't set (missing HERMES_JWT_SECRET)")
-	}
-
-	if os.Getenv("HERMES_JWT_BASE64_ENCODED") != "" {
-		JWTKey, err = base64.StdEncoding.DecodeString(jwtDataString)
-
-		if err != nil {
-			return fmt.Errorf("failed to decode base64 JWT: %s", err.Error())
-		}
-	} else {
-		JWTKey = []byte(jwtDataString)
-	}
-
-	if os.Getenv("HERMES_DEVELOPMENT_MODE") != "" {
-		developmentMode = true
-	}
-
-	return nil
-}
-
-func Parse(tokenString string, options ...jwt.ParserOption) (*jwt.Token, error) {
-	return jwt.Parse(tokenString, JWTKeyCallback, options...)
-}
-
-func GetUserFromJWT(token string) (*dbcore.User, error) {
-	parsedJWT, err := Parse(token)
-
-	if err != nil {
-		if errors.Is(err, jwt.ErrTokenExpired) {
-			return nil, fmt.Errorf("token is expired")
-		} else {
-			return nil, err
-		}
-	}
-
-	audience, err := parsedJWT.Claims.GetAudience()
-
-	if err != nil {
-		return nil, err
-	}
-
-	if len(audience) < 1 {
-		return nil, fmt.Errorf("audience is too small")
-	}
-
-	uid, err := strconv.Atoi(audience[0])
-
-	if err != nil {
-		return nil, err
-	}
-
-	user := &dbcore.User{}
-	userRequest := dbcore.DB.Preload("Permissions").Where("id = ?", uint(uid)).Find(&user)
-
-	if userRequest.Error != nil {
-		return user, fmt.Errorf("failed to find if user exists or not: %s", userRequest.Error.Error())
-	}
-
-	userExists := userRequest.RowsAffected > 0
-
-	if !userExists {
-		return user, fmt.Errorf("user does not exist")
-	}
-
-	return user, nil
-}
-
-func Generate(uid uint) (string, error) {
-	timeMultiplier := 3
-
-	if developmentMode {
-		timeMultiplier = 60 * 24
-	}
-
-	token := jwt.NewWithClaims(jwt.SigningMethodHS256, jwt.RegisteredClaims{
-		ExpiresAt: jwt.NewNumericDate(time.Now().Add(time.Duration(timeMultiplier) * time.Minute)),
-		IssuedAt:  jwt.NewNumericDate(time.Now()),
-		NotBefore: jwt.NewNumericDate(time.Now()),
-		Audience:  []string{strconv.Itoa(int(uid))},
-	})
-
-	signedToken, err := token.SignedString(JWTKey)
-
-	if err != nil {
-		return "", err
-	}
-
-	return signedToken, nil
-}
-
-func JWTKeyCallback(*jwt.Token) (interface{}, error) {
-	return JWTKey, nil
-}

backend/api/main.go

@@ -9,18 +9,19 @@ import (
 	"path"
 	"path/filepath"
 	"strings"
+	"time"
 
 	"git.terah.dev/imterah/hermes/backend/api/backendruntime"
 	"git.terah.dev/imterah/hermes/backend/api/controllers/v1/backends"
 	"git.terah.dev/imterah/hermes/backend/api/controllers/v1/proxies"
 	"git.terah.dev/imterah/hermes/backend/api/controllers/v1/users"
-	"git.terah.dev/imterah/hermes/backend/api/dbcore"
-	"git.terah.dev/imterah/hermes/backend/api/jwtcore"
+	"git.terah.dev/imterah/hermes/backend/api/db"
+	"git.terah.dev/imterah/hermes/backend/api/jwt"
+	"git.terah.dev/imterah/hermes/backend/api/state"
 	"git.terah.dev/imterah/hermes/backend/commonbackend"
 	"github.com/charmbracelet/log"
 	"github.com/gin-gonic/gin"
 	"github.com/urfave/cli/v2"
-	"gorm.io/gorm"
 )
 
 func apiEntrypoint(cCtx *cli.Context) error {
@@ -34,7 +35,26 @@ func apiEntrypoint(cCtx *cli.Context) error {
 	log.Info("Hermes is initializing...")
 	log.Debug("Initializing database and opening it...")
 
-	err := dbcore.InitializeDatabase(&gorm.Config{})
+	databaseBackendName := os.Getenv("HERMES_DATABASE_BACKEND")
+	var databaseBackendParams string
+
+	if databaseBackendName == "sqlite" {
+		databaseBackendParams = os.Getenv("HERMES_SQLITE_FILEPATH")
+
+		if databaseBackendParams == "" {
+			log.Fatal("HERMES_SQLITE_FILEPATH is not set")
+		}
+	} else if databaseBackendName == "postgresql" {
+		databaseBackendParams = os.Getenv("HERMES_POSTGRES_DSN")
+
+		if databaseBackendParams == "" {
+			log.Fatal("HERMES_POSTGRES_DSN is not set")
+		}
+	} else {
+		log.Fatalf("Unsupported database backend: %s", databaseBackendName)
+	}
+
+	dbInstance, err := db.New(databaseBackendName, databaseBackendParams)
 
 	if err != nil {
 		log.Fatalf("Failed to initialize database: %s", err)
@@ -42,16 +62,38 @@ func apiEntrypoint(cCtx *cli.Context) error {
 
 	log.Debug("Running database migrations...")
 
-	if err := dbcore.DoDatabaseMigrations(dbcore.DB); err != nil {
+	if err := dbInstance.DoMigrations(); err != nil {
 		return fmt.Errorf("Failed to run database migrations: %s", err)
 	}
 
 	log.Debug("Initializing the JWT subsystem...")
 
-	if err := jwtcore.SetupJWT(); err != nil {
-		return fmt.Errorf("Failed to initialize the JWT subsystem: %s", err.Error())
+	jwtDataString := os.Getenv("HERMES_JWT_SECRET")
+	var jwtKey []byte
+	var jwtValidityTimeDuration time.Duration
+
+	if jwtDataString == "" {
+		log.Fatalf("HERMES_JWT_SECRET is not set")
 	}
 
+	if os.Getenv("HERMES_JWT_BASE64_ENCODED") != "" {
+		jwtKey, err = base64.StdEncoding.DecodeString(jwtDataString)
+
+		if err != nil {
+			log.Fatalf("Failed to decode base64 JWT: %s", err.Error())
+		}
+	} else {
+		jwtKey = []byte(jwtDataString)
+	}
+
+	if developmentMode {
+		jwtValidityTimeDuration = jwt.DevelopmentModeTimings
+	} else {
+		jwtValidityTimeDuration = jwt.NormalModeTimings
+	}
+
+	jwtInstance := jwt.New(jwtKey, dbInstance, jwtValidityTimeDuration)
+
 	log.Debug("Initializing the backend subsystem...")
 
 	backendMetadataPath := cCtx.String("backends-path")
@@ -76,9 +118,9 @@ func apiEntrypoint(cCtx *cli.Context) error {
 
 	log.Debug("Enumerating backends...")
 
-	backendList := []dbcore.Backend{}
+	backendList := []db.Backend{}
 
-	if err := dbcore.DB.Find(&backendList).Error; err != nil {
+	if err := dbInstance.DB.Find(&backendList).Error; err != nil {
 		return fmt.Errorf("Failed to enumerate backends: %s", err.Error())
 	}
 
@@ -108,8 +150,7 @@ func apiEntrypoint(cCtx *cli.Context) error {
 				return
 			}
 
-			marshalledStartCommand, err := commonbackend.Marshal("start", &commonbackend.Start{
-				Type:      "start",
+			marshalledStartCommand, err := commonbackend.Marshal(&commonbackend.Start{
 				Arguments: backendParameters,
 			})
 
@@ -123,7 +164,7 @@ func apiEntrypoint(cCtx *cli.Context) error {
 				return
 			}
 
-			_, backendResponse, err := commonbackend.Unmarshal(conn)
+			backendResponse, err := commonbackend.Unmarshal(conn)
 
 			if err != nil {
 				log.Errorf("Failed to get start command response for backend #%d: %s", backend.ID, err.Error())
@@ -142,9 +183,9 @@ func apiEntrypoint(cCtx *cli.Context) error {
 
 			log.Warnf("Backend #%d has reinitialized! Starting up auto-starting proxies...", backend.ID)
 
-			autoStartProxies := []dbcore.Proxy{}
+			autoStartProxies := []db.Proxy{}
 
-			if err := dbcore.DB.Where("backend_id = ? AND auto_start = true", backend.ID).Find(&autoStartProxies).Error; err != nil {
+			if err := dbInstance.DB.Where("backend_id = ? AND auto_start = true", backend.ID).Find(&autoStartProxies).Error; err != nil {
 				log.Errorf("Failed to query proxies to autostart: %s", err.Error())
 				return
 			}
@@ -152,8 +193,7 @@ func apiEntrypoint(cCtx *cli.Context) error {
 			for _, proxy := range autoStartProxies {
 				log.Infof("Starting up route #%d for backend #%d: %s", proxy.ID, backend.ID, proxy.Name)
 
-				marhalledCommand, err := commonbackend.Marshal("addProxy", &commonbackend.AddProxy{
-					Type:       "addProxy",
+				marhalledCommand, err := commonbackend.Marshal(&commonbackend.AddProxy{
 					SourceIP:   proxy.SourceIP,
 					SourcePort: proxy.SourcePort,
 					DestPort:   proxy.DestinationPort,
@@ -170,7 +210,7 @@ func apiEntrypoint(cCtx *cli.Context) error {
 					continue
 				}
 
-				_, backendResponse, err := commonbackend.Unmarshal(conn)
+				backendResponse, err := commonbackend.Unmarshal(conn)
 
 				if err != nil {
 					log.Errorf("Failed to get response for backend #%d and route #%d: %s", proxy.BackendID, proxy.ID, err.Error())
@@ -204,7 +244,6 @@ func apiEntrypoint(cCtx *cli.Context) error {
 		}
 
 		backendStartResponse, err := backendInstance.ProcessCommand(&commonbackend.Start{
-			Type:      "start",
 			Arguments: backendParameters,
 		})
 
@@ -246,9 +285,9 @@ func apiEntrypoint(cCtx *cli.Context) error {
 
 		log.Infof("Successfully initialized backend #%d", backend.ID)
 
-		autoStartProxies := []dbcore.Proxy{}
+		autoStartProxies := []db.Proxy{}
 
-		if err := dbcore.DB.Where("backend_id = ? AND auto_start = true", backend.ID).Find(&autoStartProxies).Error; err != nil {
+		if err := dbInstance.DB.Where("backend_id = ? AND auto_start = true", backend.ID).Find(&autoStartProxies).Error; err != nil {
 			log.Errorf("Failed to query proxies to autostart: %s", err.Error())
 			continue
 		}
@@ -257,7 +296,6 @@ func apiEntrypoint(cCtx *cli.Context) error {
 			log.Infof("Starting up route #%d for backend #%d: %s", proxy.ID, backend.ID, proxy.Name)
 
 			backendResponse, err := backendInstance.ProcessCommand(&commonbackend.AddProxy{
-				Type:       "addProxy",
 				SourceIP:   proxy.SourceIP,
 				SourcePort: proxy.SourcePort,
 				DestPort:   proxy.DestinationPort,
@@ -313,23 +351,25 @@ func apiEntrypoint(cCtx *cli.Context) error {
 		engine.SetTrustedProxies(nil)
 	}
 
+	state := state.New(dbInstance, jwtInstance, engine)
+
 	// Initialize routes
-	engine.POST("/api/v1/users/create", users.CreateUser)
-	engine.POST("/api/v1/users/login", users.LoginUser)
-	engine.POST("/api/v1/users/refresh", users.RefreshUserToken)
-	engine.POST("/api/v1/users/remove", users.RemoveUser)
-	engine.POST("/api/v1/users/lookup", users.LookupUser)
+	users.SetupCreateUser(state)
+	users.SetupLoginUser(state)
+	users.SetupRefreshUserToken(state)
+	users.SetupRemoveUser(state)
+	users.SetupLookupUser(state)
 
-	engine.POST("/api/v1/backends/create", backends.CreateBackend)
-	engine.POST("/api/v1/backends/remove", backends.RemoveBackend)
-	engine.POST("/api/v1/backends/lookup", backends.LookupBackend)
+	backends.SetupCreateBackend(state)
+	backends.SetupRemoveBackend(state)
+	backends.SetupLookupBackend(state)
 
-	engine.POST("/api/v1/forward/create", proxies.CreateProxy)
-	engine.POST("/api/v1/forward/lookup", proxies.LookupProxy)
-	engine.POST("/api/v1/forward/remove", proxies.RemoveProxy)
-	engine.POST("/api/v1/forward/start", proxies.StartProxy)
-	engine.POST("/api/v1/forward/stop", proxies.StopProxy)
-	engine.POST("/api/v1/forward/connections", proxies.GetConnections)
+	proxies.SetupCreateProxy(state)
+	proxies.SetupRemoveProxy(state)
+	proxies.SetupLookupProxy(state)
+	proxies.SetupStartProxy(state)
+	proxies.SetupStopProxy(state)
+	proxies.SetupGetConnections(state)
 
 	log.Infof("Listening on '%s'", listeningAddress)
 	err = engine.Run(listeningAddress)
@@ -366,22 +406,6 @@ func main() {
 	app := &cli.App{
 		Name:  "hermes",
 		Usage: "port forwarding across boundaries",
-		Commands: []*cli.Command{
-			{
-				Name:    "import",
-				Usage:   "imports from legacy NextNet/Hermes source",
-				Aliases: []string{"i"},
-				Flags: []cli.Flag{
-					&cli.StringFlag{
-						Name:     "backup-path",
-						Aliases:  []string{"bp"},
-						Usage:    "path to the backup file",
-						Required: true,
-					},
-				},
-				Action: backupRestoreEntrypoint,
-			},
-		},
 		Flags: []cli.Flag{
 			&cli.StringFlag{
 				Name:     "backends-path",

backend/api/permissions/permission_nodes.go

@@ -1,6 +1,6 @@
 package permissions
 
-import "git.terah.dev/imterah/hermes/backend/api/dbcore"
+import "git.terah.dev/imterah/hermes/backend/api/db"
 
 var DefaultPermissionNodes []string = []string{
 	"routes.add",
@@ -27,7 +27,7 @@ var DefaultPermissionNodes []string = []string{
 	"users.edit",
 }
 
-func UserHasPermission(user *dbcore.User, node string) bool {
+func UserHasPermission(user *db.User, node string) bool {
 	for _, permission := range user.Permissions {
 		if permission.PermissionNode == node && permission.HasPermission {
 			return true

backend/api/state/state.go

@@ -0,0 +1,24 @@
+package state
+
+import (
+	"git.terah.dev/imterah/hermes/backend/api/db"
+	"git.terah.dev/imterah/hermes/backend/api/jwt"
+	"github.com/gin-gonic/gin"
+	"github.com/go-playground/validator/v10"
+)
+
+type State struct {
+	DB        *db.DB
+	JWT       *jwt.JWTCore
+	Engine    *gin.Engine
+	Validator *validator.Validate
+}
+
+func New(db *db.DB, jwt *jwt.JWTCore, engine *gin.Engine) *State {
+	return &State{
+		DB:        db,
+		JWT:       jwt,
+		Engine:    engine,
+		Validator: validator.New(),
+	}
+}

backend/backends.dev.json

@@ -3,6 +3,10 @@
     "name": "ssh",
     "path": "./sshbackend/sshbackend"
   },
+  {
+    "name": "sshapp",
+    "path": "./sshappbackend/local-code/sshappbackend"
+  },
   {
     "name": "dummy",
     "path": "./dummybackend/dummybackend"

backend/backends.prod.json

@@ -2,5 +2,9 @@
   {
     "name": "ssh",
     "path": "./sshbackend"
+  },
+  {
+    "name": "sshapp",
+    "path": "./sshappbackend"
   }
 ]

backend/backendutil/application.go

@@ -1,7 +1,6 @@
 package backendutil
 
 import (
-	"fmt"
 	"net"
 	"os"
 
@@ -18,9 +17,14 @@ type BackendApplicationHelper struct {
 
 func (helper *BackendApplicationHelper) Start() error {
 	log.Debug("BackendApplicationHelper is starting")
+	err := ConfigureProfiling()
+
+	if err != nil {
+		return err
+	}
+
 	log.Debug("Currently waiting for Unix socket connection...")
 
-	var err error
 	helper.socket, err = net.Dial("unix", helper.SocketPath)
 
 	if err != nil {
@@ -30,21 +34,15 @@ func (helper *BackendApplicationHelper) Start() error {
 	log.Debug("Sucessfully connected")
 
 	for {
-		commandType, commandRaw, err := commonbackend.Unmarshal(helper.socket)
+		commandRaw, err := commonbackend.Unmarshal(helper.socket)
 
 		if err != nil {
 			return err
 		}
 
-		switch commandType {
-		case "start":
-			command, ok := commandRaw.(*commonbackend.Start)
-
-			if !ok {
-				return fmt.Errorf("failed to typecast")
-			}
-
-			ok, err = helper.Backend.StartBackend(command.Arguments)
+		switch command := commandRaw.(type) {
+		case *commonbackend.Start:
+			ok, err := helper.Backend.StartBackend(command.Arguments)
 
 			var (
 				message    string
@@ -59,13 +57,12 @@ func (helper *BackendApplicationHelper) Start() error {
 			}
 
 			response := &commonbackend.BackendStatusResponse{
-				Type:       "backendStatusResponse",
 				IsRunning:  ok,
 				StatusCode: statusCode,
 				Message:    message,
 			}
 
-			responseMarshalled, err := commonbackend.Marshal(response.Type, response)
+			responseMarshalled, err := commonbackend.Marshal(response)
 
 			if err != nil {
 				log.Error("failed to marshal response: %s", err.Error())
@@ -73,13 +70,7 @@ func (helper *BackendApplicationHelper) Start() error {
 			}
 
 			helper.socket.Write(responseMarshalled)
-		case "backendStatusRequest":
-			_, ok := commandRaw.(*commonbackend.BackendStatusRequest)
-
-			if !ok {
-				return fmt.Errorf("failed to typecast")
-			}
-
+		case *commonbackend.BackendStatusRequest:
 			ok, err := helper.Backend.GetBackendStatus()
 
 			var (
@@ -95,13 +86,12 @@ func (helper *BackendApplicationHelper) Start() error {
 			}
 
 			response := &commonbackend.BackendStatusResponse{
-				Type:       "backendStatusResponse",
 				IsRunning:  ok,
 				StatusCode: statusCode,
 				Message:    message,
 			}
 
-			responseMarshalled, err := commonbackend.Marshal(response.Type, response)
+			responseMarshalled, err := commonbackend.Marshal(response)
 
 			if err != nil {
 				log.Error("failed to marshal response: %s", err.Error())
@@ -109,14 +99,8 @@ func (helper *BackendApplicationHelper) Start() error {
 			}
 
 			helper.socket.Write(responseMarshalled)
-		case "stop":
-			_, ok := commandRaw.(*commonbackend.Stop)
-
-			if !ok {
-				return fmt.Errorf("failed to typecast")
-			}
-
-			ok, err = helper.Backend.StopBackend()
+		case *commonbackend.Stop:
+			ok, err := helper.Backend.StopBackend()
 
 			var (
 				message    string
@@ -131,13 +115,12 @@ func (helper *BackendApplicationHelper) Start() error {
 			}
 
 			response := &commonbackend.BackendStatusResponse{
-				Type:       "backendStatusResponse",
 				IsRunning:  !ok,
 				StatusCode: statusCode,
 				Message:    message,
 			}
 
-			responseMarshalled, err := commonbackend.Marshal(response.Type, response)
+			responseMarshalled, err := commonbackend.Marshal(response)
 
 			if err != nil {
 				log.Error("failed to marshal response: %s", err.Error())
@@ -145,26 +128,19 @@ func (helper *BackendApplicationHelper) Start() error {
 			}
 
 			helper.socket.Write(responseMarshalled)
-		case "addProxy":
-			command, ok := commandRaw.(*commonbackend.AddProxy)
-
-			if !ok {
-				return fmt.Errorf("failed to typecast")
-			}
-
-			ok, err = helper.Backend.StartProxy(command)
+		case *commonbackend.AddProxy:
+			ok, err := helper.Backend.StartProxy(command)
 			var hasAnyFailed bool
 
-			if !ok {
-				log.Warnf("failed to add proxy (%s:%d -> remote:%d): StartProxy returned into failure state", command.SourceIP, command.SourcePort, command.DestPort)
-				hasAnyFailed = true
-			} else if err != nil {
+			if err != nil {
 				log.Warnf("failed to add proxy (%s:%d -> remote:%d): %s", command.SourceIP, command.SourcePort, command.DestPort, err.Error())
 				hasAnyFailed = true
+			} else if !ok {
+				log.Warnf("failed to add proxy (%s:%d -> remote:%d): StartProxy returned into failure state", command.SourceIP, command.SourcePort, command.DestPort)
+				hasAnyFailed = true
 			}
 
 			response := &commonbackend.ProxyStatusResponse{
-				Type:       "proxyStatusResponse",
 				SourceIP:   command.SourceIP,
 				SourcePort: command.SourcePort,
 				DestPort:   command.DestPort,
@@ -172,7 +148,7 @@ func (helper *BackendApplicationHelper) Start() error {
 				IsActive:   !hasAnyFailed,
 			}
 
-			responseMarshalled, err := commonbackend.Marshal(response.Type, response)
+			responseMarshalled, err := commonbackend.Marshal(response)
 
 			if err != nil {
 				log.Error("failed to marshal response: %s", err.Error())
@@ -180,26 +156,19 @@ func (helper *BackendApplicationHelper) Start() error {
 			}
 
 			helper.socket.Write(responseMarshalled)
-		case "removeProxy":
-			command, ok := commandRaw.(*commonbackend.RemoveProxy)
-
-			if !ok {
-				return fmt.Errorf("failed to typecast")
-			}
-
-			ok, err = helper.Backend.StopProxy(command)
+		case *commonbackend.RemoveProxy:
+			ok, err := helper.Backend.StopProxy(command)
 			var hasAnyFailed bool
 
-			if !ok {
-				log.Warnf("failed to remove proxy (%s:%d -> remote:%d): RemoveProxy returned into failure state", command.SourceIP, command.SourcePort, command.DestPort)
-				hasAnyFailed = true
-			} else if err != nil {
+			if err != nil {
 				log.Warnf("failed to remove proxy (%s:%d -> remote:%d): %s", command.SourceIP, command.SourcePort, command.DestPort, err.Error())
 				hasAnyFailed = true
+			} else if !ok {
+				log.Warnf("failed to remove proxy (%s:%d -> remote:%d): RemoveProxy returned into failure state", command.SourceIP, command.SourcePort, command.DestPort)
+				hasAnyFailed = true
 			}
 
 			response := &commonbackend.ProxyStatusResponse{
-				Type:       "proxyStatusResponse",
 				SourceIP:   command.SourceIP,
 				SourcePort: command.SourcePort,
 				DestPort:   command.DestPort,
@@ -207,7 +176,7 @@ func (helper *BackendApplicationHelper) Start() error {
 				IsActive:   hasAnyFailed,
 			}
 
-			responseMarshalled, err := commonbackend.Marshal(response.Type, response)
+			responseMarshalled, err := commonbackend.Marshal(response)
 
 			if err != nil {
 				log.Error("failed to marshal response: %s", err.Error())
@@ -215,21 +184,14 @@ func (helper *BackendApplicationHelper) Start() error {
 			}
 
 			helper.socket.Write(responseMarshalled)
-		case "proxyConnectionsRequest":
-			_, ok := commandRaw.(*commonbackend.ProxyConnectionsRequest)
-
-			if !ok {
-				return fmt.Errorf("failed to typecast")
-			}
-
+		case *commonbackend.ProxyConnectionsRequest:
 			connections := helper.Backend.GetAllClientConnections()
 
 			serverParams := &commonbackend.ProxyConnectionsResponse{
-				Type:        "proxyConnectionsResponse",
 				Connections: connections,
 			}
 
-			byteData, err := commonbackend.Marshal(serverParams.Type, serverParams)
+			byteData, err := commonbackend.Marshal(serverParams)
 
 			if err != nil {
 				return err
@@ -238,18 +200,11 @@ func (helper *BackendApplicationHelper) Start() error {
 			if _, err = helper.socket.Write(byteData); err != nil {
 				return err
 			}
-		case "checkClientParameters":
-			command, ok := commandRaw.(*commonbackend.CheckClientParameters)
-
-			if !ok {
-				return fmt.Errorf("failed to typecast")
-			}
-
+		case *commonbackend.CheckClientParameters:
 			resp := helper.Backend.CheckParametersForConnections(command)
-			resp.Type = "checkParametersResponse"
 			resp.InResponseTo = "checkClientParameters"
 
-			byteData, err := commonbackend.Marshal(resp.Type, resp)
+			byteData, err := commonbackend.Marshal(resp)
 
 			if err != nil {
 				return err
@@ -258,18 +213,11 @@ func (helper *BackendApplicationHelper) Start() error {
 			if _, err = helper.socket.Write(byteData); err != nil {
 				return err
 			}
-		case "checkServerParameters":
-			command, ok := commandRaw.(*commonbackend.CheckServerParameters)
-
-			if !ok {
-				return fmt.Errorf("failed to typecast")
-			}
-
+		case *commonbackend.CheckServerParameters:
 			resp := helper.Backend.CheckParametersForBackend(command.Arguments)
-			resp.Type = "checkParametersResponse"
 			resp.InResponseTo = "checkServerParameters"
 
-			byteData, err := commonbackend.Marshal(resp.Type, resp)
+			byteData, err := commonbackend.Marshal(resp)
 
 			if err != nil {
 				return err
@@ -278,6 +226,8 @@ func (helper *BackendApplicationHelper) Start() error {
 			if _, err = helper.socket.Write(byteData); err != nil {
 				return err
 			}
+		default:
+			log.Warnf("Unsupported command recieved: %T", command)
 		}
 	}
 }

backend/backendutil/profiling_disabled.go

@@ -0,0 +1,9 @@
+//go:build !debug
+
+package backendutil
+
+var endProfileFunc func()
+
+func ConfigureProfiling() error {
+	return nil
+}

backend/backendutil/profiling_enabled.go

@@ -0,0 +1,91 @@
+//go:build debug
+
+package backendutil
+
+import (
+	"errors"
+	"fmt"
+	"os"
+	"os/signal"
+	"runtime/pprof"
+	"syscall"
+	"time"
+
+	"github.com/charmbracelet/log"
+	"golang.org/x/exp/rand"
+)
+
+func ConfigureProfiling() error {
+	profilingMode, err := os.ReadFile("/tmp/hermes.backendlauncher.profilebackends")
+
+	if err != nil && errors.Is(err, os.ErrNotExist) {
+		return nil
+	}
+
+	switch string(profilingMode) {
+	case "cpu":
+		log.Debug("Starting CPU profiling as a background task")
+		go doCPUProfiling()
+	case "mem":
+		log.Debug("Starting memory profiling as a background task")
+		go doMemoryProfiling()
+	default:
+		log.Warnf("Unknown profiling mode: %s", string(profilingMode))
+		return nil
+	}
+
+	return nil
+}
+
+func doCPUProfiling() {
+	// (imterah) WTF? why isn't this being seeded on its own? according to Go docs, this should be seeded automatically...
+	rand.Seed(uint64(time.Now().UnixNano()))
+
+	profileFileName := fmt.Sprintf("/tmp/hermes.backendlauncher.cpu.prof.%d", rand.Int())
+	profileFile, err := os.Create(profileFileName)
+
+	if err != nil {
+		log.Fatalf("Failed to create CPU profiling file: %s", err.Error())
+	}
+
+	log.Debugf("Writing CPU usage profile to '%s'. Will capture when Ctrl+C/SIGTERM is recieved.", profileFileName)
+	pprof.StartCPUProfile(profileFile)
+
+	exitNotification := make(chan os.Signal, 1)
+	signal.Notify(exitNotification, os.Interrupt, syscall.SIGTERM)
+	<-exitNotification
+
+	log.Debug("Recieved SIGTERM. Cleaning up and exiting...")
+
+	pprof.StopCPUProfile()
+	profileFile.Close()
+
+	log.Debug("Exiting...")
+	os.Exit(0)
+}
+
+func doMemoryProfiling() {
+	// (imterah) WTF? why isn't this being seeded on its own? according to Go docs, this should be seeded automatically...
+	rand.Seed(uint64(time.Now().UnixNano()))
+
+	profileFileName := fmt.Sprintf("/tmp/hermes.backendlauncher.mem.prof.%d", rand.Int())
+	profileFile, err := os.Create(profileFileName)
+
+	if err != nil {
+		log.Fatalf("Failed to create memory profiling file: %s", err.Error())
+	}
+
+	log.Debugf("Writing memory profile to '%s'. Will capture when Ctrl+C/SIGTERM is recieved.", profileFileName)
+
+	exitNotification := make(chan os.Signal, 1)
+	signal.Notify(exitNotification, os.Interrupt, syscall.SIGTERM)
+	<-exitNotification
+
+	log.Debug("Recieved SIGTERM. Cleaning up and exiting...")
+
+	pprof.WriteHeapProfile(profileFile)
+	profileFile.Close()
+
+	log.Debug("Exiting...")
+	os.Exit(0)
+}

backend/build.sh

@@ -1,20 +1,43 @@
 #!/usr/bin/env bash
-pushd sshbackend
-GOOS=linux go build .
-strip sshbackend
-popd
+pushd sshbackend > /dev/null
+echo "building sshbackend"
+go build -ldflags="-s -w" -trimpath .
+popd > /dev/null
 
-pushd dummybackend
-GOOS=linux go build .
-strip dummybackend
-popd
+pushd dummybackend > /dev/null
+echo "building dummybackend"
+go build -ldflags="-s -w" -trimpath .
+popd > /dev/null
 
-pushd externalbackendlauncher
-go build .
-strip externalbackendlauncher
-popd
+pushd externalbackendlauncher > /dev/null
+echo "building externalbackendlauncher"
+go build -ldflags="-s -w" -trimpath .
+popd > /dev/null
 
-pushd api
-GOOS=linux go build .
-strip api
-popd
+if [ ! -d "sshappbackend/local-code/remote-bin" ]; then
+  mkdir "sshappbackend/local-code/remote-bin"
+fi
+
+pushd sshappbackend/remote-code > /dev/null
+echo "building sshappbackend/remote-code"
+# Disable dynamic linking by disabling CGo.
+# We need to make the remote code as generic as possible, so we do this
+echo " - building for arm64"
+CGO_ENABLED=0 GOOS=linux GOARCH=arm64 go build -ldflags="-s -w" -trimpath -o ../local-code/remote-bin/rt-arm64 .
+echo " - building for arm"
+CGO_ENABLED=0 GOOS=linux GOARCH=arm go build -ldflags="-s -w" -trimpath -o ../local-code/remote-bin/rt-arm .
+echo " - building for amd64"
+CGO_ENABLED=0 GOOS=linux GOARCH=amd64 go build -ldflags="-s -w" -trimpath -o ../local-code/remote-bin/rt-amd64 .
+echo " - building for i386"
+CGO_ENABLED=0 GOOS=linux GOARCH=386 go build -ldflags="-s -w" -trimpath -o ../local-code/remote-bin/rt-386 .
+popd > /dev/null
+
+pushd sshappbackend/local-code > /dev/null
+echo "building sshappbackend/local-code"
+go build -ldflags="-s -w" -trimpath -o sshappbackend .
+popd > /dev/null
+
+pushd api > /dev/null
+echo "building api"
+go build -ldflags="-s -w" -trimpath .
+popd > /dev/null

backend/commonbackend/constants.go

@@ -1,16 +1,13 @@
 package commonbackend
 
 type Start struct {
-	Type      string // Will be 'start' always
 	Arguments []byte
 }
 
 type Stop struct {
-	Type string // Will be 'stop' always
 }
 
 type AddProxy struct {
-	Type       string // Will be 'addProxy' always
 	SourceIP   string
 	SourcePort uint16
 	DestPort   uint16
@@ -18,7 +15,6 @@ type AddProxy struct {
 }
 
 type RemoveProxy struct {
-	Type       string // Will be 'removeProxy' always
 	SourceIP   string
 	SourcePort uint16
 	DestPort   uint16
@@ -26,7 +22,6 @@ type RemoveProxy struct {
 }
 
 type ProxyStatusRequest struct {
-	Type       string // Will be 'proxyStatusRequest' always
 	SourceIP   string
 	SourcePort uint16
 	DestPort   uint16
@@ -34,7 +29,6 @@ type ProxyStatusRequest struct {
 }
 
 type ProxyStatusResponse struct {
-	Type       string // Will be 'proxyStatusResponse' always
 	SourceIP   string
 	SourcePort uint16
 	DestPort   uint16
@@ -50,27 +44,22 @@ type ProxyInstance struct {
 }
 
 type ProxyInstanceResponse struct {
-	Type    string           // Will be 'proxyConnectionResponse' always
 	Proxies []*ProxyInstance // List of connections
 }
 
 type ProxyInstanceRequest struct {
-	Type string // Will be 'proxyConnectionRequest' always
 }
 
 type BackendStatusResponse struct {
-	Type       string // Will be 'backendStatusResponse' always
 	IsRunning  bool   // True if running, false if not running
 	StatusCode int    // Either the 'Success' or 'Failure' constant
 	Message    string // String message from the client (ex. failed to dial TCP)
 }
 
 type BackendStatusRequest struct {
-	Type string // Will be 'backendStatusRequest' always
 }
 
 type ProxyConnectionsRequest struct {
-	Type string // Will be 'proxyConnectionsRequest' always
 }
 
 // Client's connection to a specific proxy
@@ -83,12 +72,10 @@ type ProxyClientConnection struct {
 }
 
 type ProxyConnectionsResponse struct {
-	Type        string                   // Will be 'proxyConnectionsResponse' always
 	Connections []*ProxyClientConnection // List of connections
 }
 
 type CheckClientParameters struct {
-	Type       string // Will be 'checkClientParameters' always
 	SourceIP   string
 	SourcePort uint16
 	DestPort   uint16
@@ -96,13 +83,11 @@ type CheckClientParameters struct {
 }
 
 type CheckServerParameters struct {
-	Type      string // Will be 'checkServerParameters' always
 	Arguments []byte
 }
 
 // Sent as a response to either CheckClientParameters or CheckBackendParameters
 type CheckParametersResponse struct {
-	Type         string // Will be 'checkParametersResponse' always
 	InResponseTo string // Will be either 'checkClientParameters' or 'checkServerParameters'
 	IsValid      bool   // If true, valid, and if false, invalid
 	Message      string // String message from the client (ex. failed to unmarshal JSON: x is not defined)

backend/commonbackend/marshal.go

@@ -84,37 +84,19 @@ func marshalIndividualProxyStruct(conn *ProxyInstance) ([]byte, error) {
 	return proxyBlock, nil
 }
 
-func Marshal(commandType string, command interface{}) ([]byte, error) {
-	switch commandType {
-	case "start":
-		startCommand, ok := command.(*Start)
-
-		if !ok {
-			return nil, fmt.Errorf("failed to typecast")
-		}
-
-		startCommandBytes := make([]byte, 1+2+len(startCommand.Arguments))
+func Marshal(command interface{}) ([]byte, error) {
+	switch command := command.(type) {
+	case *Start:
+		startCommandBytes := make([]byte, 1+2+len(command.Arguments))
 		startCommandBytes[0] = StartID
-		binary.BigEndian.PutUint16(startCommandBytes[1:3], uint16(len(startCommand.Arguments)))
-		copy(startCommandBytes[3:], startCommand.Arguments)
+		binary.BigEndian.PutUint16(startCommandBytes[1:3], uint16(len(command.Arguments)))
+		copy(startCommandBytes[3:], command.Arguments)
 
 		return startCommandBytes, nil
-	case "stop":
-		_, ok := command.(*Stop)
-
-		if !ok {
-			return nil, fmt.Errorf("failed to typecast")
-		}
-
+	case *Stop:
 		return []byte{StopID}, nil
-	case "addProxy":
-		addConnectionCommand, ok := command.(*AddProxy)
-
-		if !ok {
-			return nil, fmt.Errorf("failed to typecast")
-		}
-
-		sourceIP := net.ParseIP(addConnectionCommand.SourceIP)
+	case *AddProxy:
+		sourceIP := net.ParseIP(command.SourceIP)
 
 		var ipVer uint8
 		var ipBytes []byte
@@ -134,14 +116,14 @@ func Marshal(commandType string, command interface{}) ([]byte, error) {
 
 		copy(addConnectionBytes[2:2+len(ipBytes)], ipBytes)
 
-		binary.BigEndian.PutUint16(addConnectionBytes[2+len(ipBytes):4+len(ipBytes)], addConnectionCommand.SourcePort)
-		binary.BigEndian.PutUint16(addConnectionBytes[4+len(ipBytes):6+len(ipBytes)], addConnectionCommand.DestPort)
+		binary.BigEndian.PutUint16(addConnectionBytes[2+len(ipBytes):4+len(ipBytes)], command.SourcePort)
+		binary.BigEndian.PutUint16(addConnectionBytes[4+len(ipBytes):6+len(ipBytes)], command.DestPort)
 
 		var protocol uint8
 
-		if addConnectionCommand.Protocol == "tcp" {
+		if command.Protocol == "tcp" {
 			protocol = TCP
-		} else if addConnectionCommand.Protocol == "udp" {
+		} else if command.Protocol == "udp" {
 			protocol = UDP
 		} else {
 			return nil, fmt.Errorf("invalid protocol")
@@ -150,14 +132,8 @@ func Marshal(commandType string, command interface{}) ([]byte, error) {
 		addConnectionBytes[6+len(ipBytes)] = protocol
 
 		return addConnectionBytes, nil
-	case "removeProxy":
-		removeConnectionCommand, ok := command.(*RemoveProxy)
-
-		if !ok {
-			return nil, fmt.Errorf("failed to typecast")
-		}
-
-		sourceIP := net.ParseIP(removeConnectionCommand.SourceIP)
+	case *RemoveProxy:
+		sourceIP := net.ParseIP(command.SourceIP)
 
 		var ipVer uint8
 		var ipBytes []byte
@@ -175,14 +151,14 @@ func Marshal(commandType string, command interface{}) ([]byte, error) {
 		removeConnectionBytes[0] = RemoveProxyID
 		removeConnectionBytes[1] = ipVer
 		copy(removeConnectionBytes[2:2+len(ipBytes)], ipBytes)
-		binary.BigEndian.PutUint16(removeConnectionBytes[2+len(ipBytes):4+len(ipBytes)], removeConnectionCommand.SourcePort)
-		binary.BigEndian.PutUint16(removeConnectionBytes[4+len(ipBytes):6+len(ipBytes)], removeConnectionCommand.DestPort)
+		binary.BigEndian.PutUint16(removeConnectionBytes[2+len(ipBytes):4+len(ipBytes)], command.SourcePort)
+		binary.BigEndian.PutUint16(removeConnectionBytes[4+len(ipBytes):6+len(ipBytes)], command.DestPort)
 
 		var protocol uint8
 
-		if removeConnectionCommand.Protocol == "tcp" {
+		if command.Protocol == "tcp" {
 			protocol = TCP
-		} else if removeConnectionCommand.Protocol == "udp" {
+		} else if command.Protocol == "udp" {
 			protocol = UDP
 		} else {
 			return nil, fmt.Errorf("invalid protocol")
@@ -191,17 +167,11 @@ func Marshal(commandType string, command interface{}) ([]byte, error) {
 		removeConnectionBytes[6+len(ipBytes)] = protocol
 
 		return removeConnectionBytes, nil
-	case "proxyConnectionsResponse":
-		allConnectionsCommand, ok := command.(*ProxyConnectionsResponse)
-
-		if !ok {
-			return nil, fmt.Errorf("failed to typecast")
-		}
-
-		connectionsArray := make([][]byte, len(allConnectionsCommand.Connections))
+	case *ProxyConnectionsResponse:
+		connectionsArray := make([][]byte, len(command.Connections))
 		totalSize := 0
 
-		for connIndex, conn := range allConnectionsCommand.Connections {
+		for connIndex, conn := range command.Connections {
 			connectionsArray[connIndex] = marshalIndividualConnectionStruct(conn)
 			totalSize += len(connectionsArray[connIndex]) + 1
 		}
@@ -223,14 +193,8 @@ func Marshal(commandType string, command interface{}) ([]byte, error) {
 
 		connectionCommandArray[totalSize] = '\n'
 		return connectionCommandArray, nil
-	case "checkClientParameters":
-		checkClientCommand, ok := command.(*CheckClientParameters)
-
-		if !ok {
-			return nil, fmt.Errorf("failed to typecast")
-		}
-
-		sourceIP := net.ParseIP(checkClientCommand.SourceIP)
+	case *CheckClientParameters:
+		sourceIP := net.ParseIP(command.SourceIP)
 
 		var ipVer uint8
 		var ipBytes []byte
@@ -248,14 +212,14 @@ func Marshal(commandType string, command interface{}) ([]byte, error) {
 		checkClientBytes[0] = CheckClientParametersID
 		checkClientBytes[1] = ipVer
 		copy(checkClientBytes[2:2+len(ipBytes)], ipBytes)
-		binary.BigEndian.PutUint16(checkClientBytes[2+len(ipBytes):4+len(ipBytes)], checkClientCommand.SourcePort)
-		binary.BigEndian.PutUint16(checkClientBytes[4+len(ipBytes):6+len(ipBytes)], checkClientCommand.DestPort)
+		binary.BigEndian.PutUint16(checkClientBytes[2+len(ipBytes):4+len(ipBytes)], command.SourcePort)
+		binary.BigEndian.PutUint16(checkClientBytes[4+len(ipBytes):6+len(ipBytes)], command.DestPort)
 
 		var protocol uint8
 
-		if checkClientCommand.Protocol == "tcp" {
+		if command.Protocol == "tcp" {
 			protocol = TCP
-		} else if checkClientCommand.Protocol == "udp" {
+		} else if command.Protocol == "udp" {
 			protocol = UDP
 		} else {
 			return nil, fmt.Errorf("invalid protocol")
@@ -264,31 +228,19 @@ func Marshal(commandType string, command interface{}) ([]byte, error) {
 		checkClientBytes[6+len(ipBytes)] = protocol
 
 		return checkClientBytes, nil
-	case "checkServerParameters":
-		checkServerCommand, ok := command.(*CheckServerParameters)
-
-		if !ok {
-			return nil, fmt.Errorf("failed to typecast")
-		}
-
-		serverCommandBytes := make([]byte, 1+2+len(checkServerCommand.Arguments))
+	case *CheckServerParameters:
+		serverCommandBytes := make([]byte, 1+2+len(command.Arguments))
 		serverCommandBytes[0] = CheckServerParametersID
-		binary.BigEndian.PutUint16(serverCommandBytes[1:3], uint16(len(checkServerCommand.Arguments)))
-		copy(serverCommandBytes[3:], checkServerCommand.Arguments)
+		binary.BigEndian.PutUint16(serverCommandBytes[1:3], uint16(len(command.Arguments)))
+		copy(serverCommandBytes[3:], command.Arguments)
 
 		return serverCommandBytes, nil
-	case "checkParametersResponse":
-		checkParametersCommand, ok := command.(*CheckParametersResponse)
-
-		if !ok {
-			return nil, fmt.Errorf("failed to typecast")
-		}
-
+	case *CheckParametersResponse:
 		var checkMethod uint8
 
-		if checkParametersCommand.InResponseTo == "checkClientParameters" {
+		if command.InResponseTo == "checkClientParameters" {
 			checkMethod = CheckClientParametersID
-		} else if checkParametersCommand.InResponseTo == "checkServerParameters" {
+		} else if command.InResponseTo == "checkServerParameters" {
 			checkMethod = CheckServerParametersID
 		} else {
 			return nil, fmt.Errorf("invalid mode recieved (must be either checkClientParameters or checkServerParameters)")
@@ -296,68 +248,50 @@ func Marshal(commandType string, command interface{}) ([]byte, error) {
 
 		var isValid uint8
 
-		if checkParametersCommand.IsValid {
+		if command.IsValid {
 			isValid = 1
 		}
 
-		checkResponseBytes := make([]byte, 3+2+len(checkParametersCommand.Message))
+		checkResponseBytes := make([]byte, 3+2+len(command.Message))
 		checkResponseBytes[0] = CheckParametersResponseID
 		checkResponseBytes[1] = checkMethod
 		checkResponseBytes[2] = isValid
 
-		binary.BigEndian.PutUint16(checkResponseBytes[3:5], uint16(len(checkParametersCommand.Message)))
+		binary.BigEndian.PutUint16(checkResponseBytes[3:5], uint16(len(command.Message)))
 
-		if len(checkParametersCommand.Message) != 0 {
-			copy(checkResponseBytes[5:], []byte(checkParametersCommand.Message))
+		if len(command.Message) != 0 {
+			copy(checkResponseBytes[5:], []byte(command.Message))
 		}
 
 		return checkResponseBytes, nil
-	case "backendStatusResponse":
-		backendStatusResponse, ok := command.(*BackendStatusResponse)
-
-		if !ok {
-			return nil, fmt.Errorf("failed to typecast")
-		}
-
+	case *BackendStatusResponse:
 		var isRunning uint8
 
-		if backendStatusResponse.IsRunning {
+		if command.IsRunning {
 			isRunning = 1
 		} else {
 			isRunning = 0
 		}
 
-		statusResponseBytes := make([]byte, 3+2+len(backendStatusResponse.Message))
+		statusResponseBytes := make([]byte, 3+2+len(command.Message))
 		statusResponseBytes[0] = BackendStatusResponseID
 		statusResponseBytes[1] = isRunning
-		statusResponseBytes[2] = byte(backendStatusResponse.StatusCode)
+		statusResponseBytes[2] = byte(command.StatusCode)
 
-		binary.BigEndian.PutUint16(statusResponseBytes[3:5], uint16(len(backendStatusResponse.Message)))
+		binary.BigEndian.PutUint16(statusResponseBytes[3:5], uint16(len(command.Message)))
 
-		if len(backendStatusResponse.Message) != 0 {
-			copy(statusResponseBytes[5:], []byte(backendStatusResponse.Message))
+		if len(command.Message) != 0 {
+			copy(statusResponseBytes[5:], []byte(command.Message))
 		}
 
 		return statusResponseBytes, nil
-	case "backendStatusRequest":
-		_, ok := command.(*BackendStatusRequest)
-
-		if !ok {
-			return nil, fmt.Errorf("failed to typecast")
-		}
-
+	case *BackendStatusRequest:
 		statusRequestBytes := make([]byte, 1)
 		statusRequestBytes[0] = BackendStatusRequestID
 
 		return statusRequestBytes, nil
-	case "proxyStatusRequest":
-		proxyStatusRequest, ok := command.(*ProxyStatusRequest)
-
-		if !ok {
-			return nil, fmt.Errorf("failed to typecast")
-		}
-
-		sourceIP := net.ParseIP(proxyStatusRequest.SourceIP)
+	case *ProxyStatusRequest:
+		sourceIP := net.ParseIP(command.SourceIP)
 
 		var ipVer uint8
 		var ipBytes []byte
@@ -370,37 +304,31 @@ func Marshal(commandType string, command interface{}) ([]byte, error) {
 			ipVer = IPv4
 		}
 
-		proxyStatusRequestBytes := make([]byte, 1+1+len(ipBytes)+2+2+1)
+		commandBytes := make([]byte, 1+1+len(ipBytes)+2+2+1)
 
-		proxyStatusRequestBytes[0] = ProxyStatusRequestID
-		proxyStatusRequestBytes[1] = ipVer
+		commandBytes[0] = ProxyStatusRequestID
+		commandBytes[1] = ipVer
 
-		copy(proxyStatusRequestBytes[2:2+len(ipBytes)], ipBytes)
+		copy(commandBytes[2:2+len(ipBytes)], ipBytes)
 
-		binary.BigEndian.PutUint16(proxyStatusRequestBytes[2+len(ipBytes):4+len(ipBytes)], proxyStatusRequest.SourcePort)
-		binary.BigEndian.PutUint16(proxyStatusRequestBytes[4+len(ipBytes):6+len(ipBytes)], proxyStatusRequest.DestPort)
+		binary.BigEndian.PutUint16(commandBytes[2+len(ipBytes):4+len(ipBytes)], command.SourcePort)
+		binary.BigEndian.PutUint16(commandBytes[4+len(ipBytes):6+len(ipBytes)], command.DestPort)
 
 		var protocol uint8
 
-		if proxyStatusRequest.Protocol == "tcp" {
+		if command.Protocol == "tcp" {
 			protocol = TCP
-		} else if proxyStatusRequest.Protocol == "udp" {
+		} else if command.Protocol == "udp" {
 			protocol = UDP
 		} else {
 			return nil, fmt.Errorf("invalid protocol")
 		}
 
-		proxyStatusRequestBytes[6+len(ipBytes)] = protocol
+		commandBytes[6+len(ipBytes)] = protocol
 
-		return proxyStatusRequestBytes, nil
-	case "proxyStatusResponse":
-		proxyStatusResponse, ok := command.(*ProxyStatusResponse)
-
-		if !ok {
-			return nil, fmt.Errorf("failed to typecast")
-		}
-
-		sourceIP := net.ParseIP(proxyStatusResponse.SourceIP)
+		return commandBytes, nil
+	case *ProxyStatusResponse:
+		sourceIP := net.ParseIP(command.SourceIP)
 
 		var ipVer uint8
 		var ipBytes []byte
@@ -413,50 +341,44 @@ func Marshal(commandType string, command interface{}) ([]byte, error) {
 			ipVer = IPv4
 		}
 
-		proxyStatusResponseBytes := make([]byte, 1+1+len(ipBytes)+2+2+1+1)
+		commandBytes := make([]byte, 1+1+len(ipBytes)+2+2+1+1)
 
-		proxyStatusResponseBytes[0] = ProxyStatusResponseID
-		proxyStatusResponseBytes[1] = ipVer
+		commandBytes[0] = ProxyStatusResponseID
+		commandBytes[1] = ipVer
 
-		copy(proxyStatusResponseBytes[2:2+len(ipBytes)], ipBytes)
+		copy(commandBytes[2:2+len(ipBytes)], ipBytes)
 
-		binary.BigEndian.PutUint16(proxyStatusResponseBytes[2+len(ipBytes):4+len(ipBytes)], proxyStatusResponse.SourcePort)
-		binary.BigEndian.PutUint16(proxyStatusResponseBytes[4+len(ipBytes):6+len(ipBytes)], proxyStatusResponse.DestPort)
+		binary.BigEndian.PutUint16(commandBytes[2+len(ipBytes):4+len(ipBytes)], command.SourcePort)
+		binary.BigEndian.PutUint16(commandBytes[4+len(ipBytes):6+len(ipBytes)], command.DestPort)
 
 		var protocol uint8
 
-		if proxyStatusResponse.Protocol == "tcp" {
+		if command.Protocol == "tcp" {
 			protocol = TCP
-		} else if proxyStatusResponse.Protocol == "udp" {
+		} else if command.Protocol == "udp" {
 			protocol = UDP
 		} else {
 			return nil, fmt.Errorf("invalid protocol")
 		}
 
-		proxyStatusResponseBytes[6+len(ipBytes)] = protocol
+		commandBytes[6+len(ipBytes)] = protocol
 
 		var isActive uint8
 
-		if proxyStatusResponse.IsActive {
+		if command.IsActive {
 			isActive = 1
 		} else {
 			isActive = 0
 		}
 
-		proxyStatusResponseBytes[7+len(ipBytes)] = isActive
+		commandBytes[7+len(ipBytes)] = isActive
 
-		return proxyStatusResponseBytes, nil
-	case "proxyInstanceResponse":
-		proxyConectionResponse, ok := command.(*ProxyInstanceResponse)
-
-		if !ok {
-			return nil, fmt.Errorf("failed to typecast")
-		}
-
-		proxyArray := make([][]byte, len(proxyConectionResponse.Proxies))
+		return commandBytes, nil
+	case *ProxyInstanceResponse:
+		proxyArray := make([][]byte, len(command.Proxies))
 		totalSize := 0
 
-		for proxyIndex, proxy := range proxyConectionResponse.Proxies {
+		for proxyIndex, proxy := range command.Proxies {
 			var err error
 			proxyArray[proxyIndex], err = marshalIndividualProxyStruct(proxy)
 
@@ -485,23 +407,11 @@ func Marshal(commandType string, command interface{}) ([]byte, error) {
 		connectionCommandArray[totalSize] = '\n'
 
 		return connectionCommandArray, nil
-	case "proxyInstanceRequest":
-		_, ok := command.(*ProxyInstanceRequest)
-
-		if !ok {
-			return nil, fmt.Errorf("failed to typecast")
-		}
-
+	case *ProxyInstanceRequest:
 		return []byte{ProxyInstanceRequestID}, nil
-	case "proxyConnectionsRequest":
-		_, ok := command.(*ProxyConnectionsRequest)
-
-		if !ok {
-			return nil, fmt.Errorf("failed to typecast")
-		}
-
+	case *ProxyConnectionsRequest:
 		return []byte{ProxyConnectionsRequestID}, nil
 	}
 
-	return nil, fmt.Errorf("couldn't match command name")
+	return nil, fmt.Errorf("couldn't match command type")
 }

backend/commonbackend/marshalling_test.go

@@ -9,13 +9,12 @@ import (
 
 var logLevel = os.Getenv("HERMES_LOG_LEVEL")
 
-func TestStartCommandMarshalSupport(t *testing.T) {
+func TestStart(t *testing.T) {
 	commandInput := &Start{
-		Type:      "start",
 		Arguments: []byte("Hello from automated testing"),
 	}
 
-	commandMarshalled, err := Marshal(commandInput.Type, commandInput)
+	commandMarshalled, err := Marshal(commandInput)
 
 	if logLevel == "debug" {
 		log.Printf("Generated array contents: %v", commandMarshalled)
@@ -26,39 +25,27 @@ func TestStartCommandMarshalSupport(t *testing.T) {
 	}
 
 	buf := bytes.NewBuffer(commandMarshalled)
-	commandType, commandUnmarshalledRaw, err := Unmarshal(buf)
+	commandUnmarshalledRaw, err := Unmarshal(buf)
 
 	if err != nil {
 		t.Fatal(err.Error())
 	}
 
-	if commandType != commandInput.Type {
-		t.Fail()
-		log.Print("command type does not match up!")
-	}
-
 	commandUnmarshalled, ok := commandUnmarshalledRaw.(*Start)
 
 	if !ok {
 		t.Fatal("failed typecast")
 	}
 
-	if commandInput.Type != commandUnmarshalled.Type {
-		t.Fail()
-		log.Printf("Types are not equal (orig: %s, unmsh: %s)", commandInput.Type, commandUnmarshalled.Type)
-	}
-
 	if !bytes.Equal(commandInput.Arguments, commandUnmarshalled.Arguments) {
 		log.Fatalf("Arguments are not equal (orig: '%s', unmsh: '%s')", string(commandInput.Arguments), string(commandUnmarshalled.Arguments))
 	}
 }
 
-func TestStopCommandMarshalSupport(t *testing.T) {
-	commandInput := &Stop{
-		Type: "stop",
-	}
+func TestStop(t *testing.T) {
+	commandInput := &Stop{}
 
-	commandMarshalled, err := Marshal(commandInput.Type, commandInput)
+	commandMarshalled, err := Marshal(commandInput)
 
 	if logLevel == "debug" {
 		log.Printf("Generated array contents: %v", commandMarshalled)
@@ -69,39 +56,28 @@ func TestStopCommandMarshalSupport(t *testing.T) {
 	}
 
 	buf := bytes.NewBuffer(commandMarshalled)
-	commandType, commandUnmarshalledRaw, err := Unmarshal(buf)
+	commandUnmarshalledRaw, err := Unmarshal(buf)
 
 	if err != nil {
 		t.Fatal(err.Error())
 	}
 
-	if commandType != commandInput.Type {
-		t.Fail()
-		log.Print("command type does not match up!")
-	}
-
-	commandUnmarshalled, ok := commandUnmarshalledRaw.(*Stop)
+	_, ok := commandUnmarshalledRaw.(*Stop)
 
 	if !ok {
 		t.Fatal("failed typecast")
 	}
-
-	if commandInput.Type != commandUnmarshalled.Type {
-		t.Fail()
-		log.Printf("Types are not equal (orig: %s, unmsh: %s)", commandInput.Type, commandUnmarshalled.Type)
-	}
 }
 
-func TestAddConnectionCommandMarshalSupport(t *testing.T) {
+func TestAddConnection(t *testing.T) {
 	commandInput := &AddProxy{
-		Type:       "addProxy",
 		SourceIP:   "192.168.0.139",
 		SourcePort: 19132,
 		DestPort:   19132,
 		Protocol:   "tcp",
 	}
 
-	commandMarshalled, err := Marshal(commandInput.Type, commandInput)
+	commandMarshalled, err := Marshal(commandInput)
 
 	if logLevel == "debug" {
 		log.Printf("Generated array contents: %v", commandMarshalled)
@@ -112,28 +88,18 @@ func TestAddConnectionCommandMarshalSupport(t *testing.T) {
 	}
 
 	buf := bytes.NewBuffer(commandMarshalled)
-	commandType, commandUnmarshalledRaw, err := Unmarshal(buf)
+	commandUnmarshalledRaw, err := Unmarshal(buf)
 
 	if err != nil {
 		t.Fatal(err.Error())
 	}
 
-	if commandType != commandInput.Type {
-		t.Fail()
-		log.Print("command type does not match up!")
-	}
-
 	commandUnmarshalled, ok := commandUnmarshalledRaw.(*AddProxy)
 
 	if !ok {
 		t.Fatal("failed typecast")
 	}
 
-	if commandInput.Type != commandUnmarshalled.Type {
-		t.Fail()
-		log.Printf("Types are not equal (orig: %s, unmsh: %s)", commandInput.Type, commandUnmarshalled.Type)
-	}
-
 	if commandInput.SourceIP != commandUnmarshalled.SourceIP {
 		t.Fail()
 		log.Printf("SourceIP's are not equal (orig: %s, unmsh: %s)", commandInput.SourceIP, commandUnmarshalled.SourceIP)
@@ -155,16 +121,15 @@ func TestAddConnectionCommandMarshalSupport(t *testing.T) {
 	}
 }
 
-func TestRemoveConnectionCommandMarshalSupport(t *testing.T) {
+func TestRemoveConnection(t *testing.T) {
 	commandInput := &RemoveProxy{
-		Type:       "removeProxy",
 		SourceIP:   "192.168.0.139",
 		SourcePort: 19132,
 		DestPort:   19132,
 		Protocol:   "tcp",
 	}
 
-	commandMarshalled, err := Marshal(commandInput.Type, commandInput)
+	commandMarshalled, err := Marshal(commandInput)
 
 	if err != nil {
 		t.Fatal(err.Error())
@@ -175,28 +140,18 @@ func TestRemoveConnectionCommandMarshalSupport(t *testing.T) {
 	}
 
 	buf := bytes.NewBuffer(commandMarshalled)
-	commandType, commandUnmarshalledRaw, err := Unmarshal(buf)
+	commandUnmarshalledRaw, err := Unmarshal(buf)
 
 	if err != nil {
 		t.Fatal(err.Error())
 	}
 
-	if commandType != commandInput.Type {
-		t.Fail()
-		log.Print("command type does not match up!")
-	}
-
 	commandUnmarshalled, ok := commandUnmarshalledRaw.(*RemoveProxy)
 
 	if !ok {
 		t.Fatal("failed typecast")
 	}
 
-	if commandInput.Type != commandUnmarshalled.Type {
-		t.Fail()
-		log.Printf("Types are not equal (orig: %s, unmsh: %s)", commandInput.Type, commandUnmarshalled.Type)
-	}
-
 	if commandInput.SourceIP != commandUnmarshalled.SourceIP {
 		t.Fail()
 		log.Printf("SourceIP's are not equal (orig: %s, unmsh: %s)", commandInput.SourceIP, commandUnmarshalled.SourceIP)
@@ -218,9 +173,8 @@ func TestRemoveConnectionCommandMarshalSupport(t *testing.T) {
 	}
 }
 
-func TestGetAllConnectionsCommandMarshalSupport(t *testing.T) {
+func TestGetAllConnections(t *testing.T) {
 	commandInput := &ProxyConnectionsResponse{
-		Type: "proxyConnectionsResponse",
 		Connections: []*ProxyClientConnection{
 			{
 				SourceIP:   "127.0.0.1",
@@ -246,7 +200,7 @@ func TestGetAllConnectionsCommandMarshalSupport(t *testing.T) {
 		},
 	}
 
-	commandMarshalled, err := Marshal(commandInput.Type, commandInput)
+	commandMarshalled, err := Marshal(commandInput)
 
 	if err != nil {
 		t.Fatal(err.Error())
@@ -257,28 +211,18 @@ func TestGetAllConnectionsCommandMarshalSupport(t *testing.T) {
 	}
 
 	buf := bytes.NewBuffer(commandMarshalled)
-	commandType, commandUnmarshalledRaw, err := Unmarshal(buf)
+	commandUnmarshalledRaw, err := Unmarshal(buf)
 
 	if err != nil {
 		t.Fatal(err.Error())
 	}
 
-	if commandType != commandInput.Type {
-		t.Fail()
-		log.Print("command type does not match up!")
-	}
-
 	commandUnmarshalled, ok := commandUnmarshalledRaw.(*ProxyConnectionsResponse)
 
 	if !ok {
 		t.Fatal("failed typecast")
 	}
 
-	if commandInput.Type != commandUnmarshalled.Type {
-		t.Fail()
-		log.Printf("Types are not equal (orig: %s, unmsh: %s)", commandInput.Type, commandUnmarshalled.Type)
-	}
-
 	for commandIndex, originalConnection := range commandInput.Connections {
 		remoteConnection := commandUnmarshalled.Connections[commandIndex]
 
@@ -309,16 +253,15 @@ func TestGetAllConnectionsCommandMarshalSupport(t *testing.T) {
 	}
 }
 
-func TestCheckClientParametersMarshalSupport(t *testing.T) {
+func TestCheckClientParameters(t *testing.T) {
 	commandInput := &CheckClientParameters{
-		Type:       "checkClientParameters",
 		SourceIP:   "192.168.0.139",
 		SourcePort: 19132,
 		DestPort:   19132,
 		Protocol:   "tcp",
 	}
 
-	commandMarshalled, err := Marshal(commandInput.Type, commandInput)
+	commandMarshalled, err := Marshal(commandInput)
 
 	if err != nil {
 		t.Fatal(err.Error())
@@ -329,28 +272,18 @@ func TestCheckClientParametersMarshalSupport(t *testing.T) {
 	}
 
 	buf := bytes.NewBuffer(commandMarshalled)
-	commandType, commandUnmarshalledRaw, err := Unmarshal(buf)
+	commandUnmarshalledRaw, err := Unmarshal(buf)
 
 	if err != nil {
 		t.Fatal(err.Error())
 	}
 
-	if commandType != commandInput.Type {
-		t.Fail()
-		log.Printf("command type does not match up! (orig: %s, unmsh: %s)", commandType, commandInput.Type)
-	}
-
 	commandUnmarshalled, ok := commandUnmarshalledRaw.(*CheckClientParameters)
 
 	if !ok {
 		t.Fatal("failed typecast")
 	}
 
-	if commandInput.Type != commandUnmarshalled.Type {
-		t.Fail()
-		log.Printf("Types are not equal (orig: %s, unmsh: %s)", commandInput.Type, commandUnmarshalled.Type)
-	}
-
 	if commandInput.SourceIP != commandUnmarshalled.SourceIP {
 		t.Fail()
 		log.Printf("SourceIP's are not equal (orig: %s, unmsh: %s)", commandInput.SourceIP, commandUnmarshalled.SourceIP)
@@ -372,13 +305,12 @@ func TestCheckClientParametersMarshalSupport(t *testing.T) {
 	}
 }
 
-func TestCheckServerParametersMarshalSupport(t *testing.T) {
+func TestCheckServerParameters(t *testing.T) {
 	commandInput := &CheckServerParameters{
-		Type:      "checkServerParameters",
 		Arguments: []byte("Hello from automated testing"),
 	}
 
-	commandMarshalled, err := Marshal(commandInput.Type, commandInput)
+	commandMarshalled, err := Marshal(commandInput)
 
 	if logLevel == "debug" {
 		log.Printf("Generated array contents: %v", commandMarshalled)
@@ -389,42 +321,31 @@ func TestCheckServerParametersMarshalSupport(t *testing.T) {
 	}
 
 	buf := bytes.NewBuffer(commandMarshalled)
-	commandType, commandUnmarshalledRaw, err := Unmarshal(buf)
+	commandUnmarshalledRaw, err := Unmarshal(buf)
 
 	if err != nil {
 		t.Fatal(err.Error())
 	}
 
-	if commandType != commandInput.Type {
-		t.Fail()
-		log.Print("command type does not match up!")
-	}
-
 	commandUnmarshalled, ok := commandUnmarshalledRaw.(*CheckServerParameters)
 
 	if !ok {
 		t.Fatal("failed typecast")
 	}
 
-	if commandInput.Type != commandUnmarshalled.Type {
-		t.Fail()
-		log.Printf("Types are not equal (orig: %s, unmsh: %s)", commandInput.Type, commandUnmarshalled.Type)
-	}
-
 	if !bytes.Equal(commandInput.Arguments, commandUnmarshalled.Arguments) {
 		log.Fatalf("Arguments are not equal (orig: '%s', unmsh: '%s')", string(commandInput.Arguments), string(commandUnmarshalled.Arguments))
 	}
 }
 
-func TestCheckParametersResponseMarshalSupport(t *testing.T) {
+func TestCheckParametersResponse(t *testing.T) {
 	commandInput := &CheckParametersResponse{
-		Type:         "checkParametersResponse",
 		InResponseTo: "checkClientParameters",
 		IsValid:      true,
 		Message:      "Hello from automated testing",
 	}
 
-	commandMarshalled, err := Marshal(commandInput.Type, commandInput)
+	commandMarshalled, err := Marshal(commandInput)
 
 	if err != nil {
 		t.Fatal(err.Error())
@@ -435,28 +356,18 @@ func TestCheckParametersResponseMarshalSupport(t *testing.T) {
 	}
 
 	buf := bytes.NewBuffer(commandMarshalled)
-	commandType, commandUnmarshalledRaw, err := Unmarshal(buf)
+	commandUnmarshalledRaw, err := Unmarshal(buf)
 
 	if err != nil {
 		t.Fatal(err.Error())
 	}
 
-	if commandType != commandInput.Type {
-		t.Fail()
-		log.Printf("command type does not match up! (orig: %s, unmsh: %s)", commandType, commandInput.Type)
-	}
-
 	commandUnmarshalled, ok := commandUnmarshalledRaw.(*CheckParametersResponse)
 
 	if !ok {
 		t.Fatal("failed typecast")
 	}
 
-	if commandInput.Type != commandUnmarshalled.Type {
-		t.Fail()
-		log.Printf("Types are not equal (orig: %s, unmsh: %s)", commandInput.Type, commandUnmarshalled.Type)
-	}
-
 	if commandInput.InResponseTo != commandUnmarshalled.InResponseTo {
 		t.Fail()
 		log.Printf("InResponseTo's are not equal (orig: %s, unmsh: %s)", commandInput.InResponseTo, commandUnmarshalled.InResponseTo)
@@ -473,12 +384,9 @@ func TestCheckParametersResponseMarshalSupport(t *testing.T) {
 	}
 }
 
-func TestBackendStatusRequestMarshalSupport(t *testing.T) {
-	commandInput := &BackendStatusRequest{
-		Type: "backendStatusRequest",
-	}
-
-	commandMarshalled, err := Marshal(commandInput.Type, commandInput)
+func TestBackendStatusRequest(t *testing.T) {
+	commandInput := &BackendStatusRequest{}
+	commandMarshalled, err := Marshal(commandInput)
 
 	if logLevel == "debug" {
 		log.Printf("Generated array contents: %v", commandMarshalled)
@@ -489,38 +397,27 @@ func TestBackendStatusRequestMarshalSupport(t *testing.T) {
 	}
 
 	buf := bytes.NewBuffer(commandMarshalled)
-	commandType, commandUnmarshalledRaw, err := Unmarshal(buf)
+	commandUnmarshalledRaw, err := Unmarshal(buf)
 
 	if err != nil {
 		t.Fatal(err.Error())
 	}
 
-	if commandType != commandInput.Type {
-		t.Fail()
-		log.Print("command type does not match up!")
-	}
-
-	commandUnmarshalled, ok := commandUnmarshalledRaw.(*BackendStatusRequest)
+	_, ok := commandUnmarshalledRaw.(*BackendStatusRequest)
 
 	if !ok {
 		t.Fatal("failed typecast")
 	}
-
-	if commandInput.Type != commandUnmarshalled.Type {
-		t.Fail()
-		log.Printf("Types are not equal (orig: %s, unmsh: %s)", commandInput.Type, commandUnmarshalled.Type)
-	}
 }
 
-func TestBackendStatusResponseMarshalSupport(t *testing.T) {
+func TestBackendStatusResponse(t *testing.T) {
 	commandInput := &BackendStatusResponse{
-		Type:       "backendStatusResponse",
 		IsRunning:  true,
 		StatusCode: StatusFailure,
 		Message:    "Hello from automated testing",
 	}
 
-	commandMarshalled, err := Marshal(commandInput.Type, commandInput)
+	commandMarshalled, err := Marshal(commandInput)
 
 	if logLevel == "debug" {
 		log.Printf("Generated array contents: %v", commandMarshalled)
@@ -531,28 +428,18 @@ func TestBackendStatusResponseMarshalSupport(t *testing.T) {
 	}
 
 	buf := bytes.NewBuffer(commandMarshalled)
-	commandType, commandUnmarshalledRaw, err := Unmarshal(buf)
+	commandUnmarshalledRaw, err := Unmarshal(buf)
 
 	if err != nil {
 		t.Fatal(err.Error())
 	}
 
-	if commandType != commandInput.Type {
-		t.Fail()
-		log.Print("command type does not match up!")
-	}
-
 	commandUnmarshalled, ok := commandUnmarshalledRaw.(*BackendStatusResponse)
 
 	if !ok {
 		t.Fatal("failed typecast")
 	}
 
-	if commandInput.Type != commandUnmarshalled.Type {
-		t.Fail()
-		log.Printf("Types are not equal (orig: %s, unmsh: %s)", commandInput.Type, commandUnmarshalled.Type)
-	}
-
 	if commandInput.IsRunning != commandUnmarshalled.IsRunning {
 		t.Fail()
 		log.Printf("IsRunning's are not equal (orig: %t, unmsh: %t)", commandInput.IsRunning, commandUnmarshalled.IsRunning)
@@ -569,16 +456,15 @@ func TestBackendStatusResponseMarshalSupport(t *testing.T) {
 	}
 }
 
-func TestProxyStatusRequestMarshalSupport(t *testing.T) {
+func TestProxyStatusRequest(t *testing.T) {
 	commandInput := &ProxyStatusRequest{
-		Type:       "proxyStatusRequest",
 		SourceIP:   "192.168.0.139",
 		SourcePort: 19132,
 		DestPort:   19132,
 		Protocol:   "tcp",
 	}
 
-	commandMarshalled, err := Marshal(commandInput.Type, commandInput)
+	commandMarshalled, err := Marshal(commandInput)
 
 	if err != nil {
 		t.Fatal(err.Error())
@@ -589,28 +475,18 @@ func TestProxyStatusRequestMarshalSupport(t *testing.T) {
 	}
 
 	buf := bytes.NewBuffer(commandMarshalled)
-	commandType, commandUnmarshalledRaw, err := Unmarshal(buf)
+	commandUnmarshalledRaw, err := Unmarshal(buf)
 
 	if err != nil {
 		t.Fatal(err.Error())
 	}
 
-	if commandType != commandInput.Type {
-		t.Fail()
-		log.Print("command type does not match up!")
-	}
-
 	commandUnmarshalled, ok := commandUnmarshalledRaw.(*ProxyStatusRequest)
 
 	if !ok {
 		t.Fatal("failed typecast")
 	}
 
-	if commandInput.Type != commandUnmarshalled.Type {
-		t.Fail()
-		log.Printf("Types are not equal (orig: %s, unmsh: %s)", commandInput.Type, commandUnmarshalled.Type)
-	}
-
 	if commandInput.SourceIP != commandUnmarshalled.SourceIP {
 		t.Fail()
 		log.Printf("SourceIP's are not equal (orig: %s, unmsh: %s)", commandInput.SourceIP, commandUnmarshalled.SourceIP)
@@ -632,9 +508,8 @@ func TestProxyStatusRequestMarshalSupport(t *testing.T) {
 	}
 }
 
-func TestProxyStatusResponseMarshalSupport(t *testing.T) {
+func TestProxyStatusResponse(t *testing.T) {
 	commandInput := &ProxyStatusResponse{
-		Type:       "proxyStatusResponse",
 		SourceIP:   "192.168.0.139",
 		SourcePort: 19132,
 		DestPort:   19132,
@@ -642,7 +517,7 @@ func TestProxyStatusResponseMarshalSupport(t *testing.T) {
 		IsActive:   true,
 	}
 
-	commandMarshalled, err := Marshal(commandInput.Type, commandInput)
+	commandMarshalled, err := Marshal(commandInput)
 
 	if err != nil {
 		t.Fatal(err.Error())
@@ -653,28 +528,18 @@ func TestProxyStatusResponseMarshalSupport(t *testing.T) {
 	}
 
 	buf := bytes.NewBuffer(commandMarshalled)
-	commandType, commandUnmarshalledRaw, err := Unmarshal(buf)
+	commandUnmarshalledRaw, err := Unmarshal(buf)
 
 	if err != nil {
 		t.Fatal(err.Error())
 	}
 
-	if commandType != commandInput.Type {
-		t.Fail()
-		log.Print("command type does not match up!")
-	}
-
 	commandUnmarshalled, ok := commandUnmarshalledRaw.(*ProxyStatusResponse)
 
 	if !ok {
 		t.Fatal("failed typecast")
 	}
 
-	if commandInput.Type != commandUnmarshalled.Type {
-		t.Fail()
-		log.Printf("Types are not equal (orig: %s, unmsh: %s)", commandInput.Type, commandUnmarshalled.Type)
-	}
-
 	if commandInput.SourceIP != commandUnmarshalled.SourceIP {
 		t.Fail()
 		log.Printf("SourceIP's are not equal (orig: %s, unmsh: %s)", commandInput.SourceIP, commandUnmarshalled.SourceIP)
@@ -701,12 +566,10 @@ func TestProxyStatusResponseMarshalSupport(t *testing.T) {
 	}
 }
 
-func TestProxyConnectionRequestMarshalSupport(t *testing.T) {
-	commandInput := &ProxyInstanceRequest{
-		Type: "proxyInstanceRequest",
-	}
+func TestProxyConnectionRequest(t *testing.T) {
+	commandInput := &ProxyInstanceRequest{}
 
-	commandMarshalled, err := Marshal(commandInput.Type, commandInput)
+	commandMarshalled, err := Marshal(commandInput)
 
 	if logLevel == "debug" {
 		log.Printf("Generated array contents: %v", commandMarshalled)
@@ -717,32 +580,21 @@ func TestProxyConnectionRequestMarshalSupport(t *testing.T) {
 	}
 
 	buf := bytes.NewBuffer(commandMarshalled)
-	commandType, commandUnmarshalledRaw, err := Unmarshal(buf)
+	commandUnmarshalledRaw, err := Unmarshal(buf)
 
 	if err != nil {
 		t.Fatal(err.Error())
 	}
 
-	if commandType != commandInput.Type {
-		t.Fail()
-		log.Print("command type does not match up!")
-	}
-
-	commandUnmarshalled, ok := commandUnmarshalledRaw.(*ProxyInstanceRequest)
+	_, ok := commandUnmarshalledRaw.(*ProxyInstanceRequest)
 
 	if !ok {
 		t.Fatal("failed typecast")
 	}
-
-	if commandInput.Type != commandUnmarshalled.Type {
-		t.Fail()
-		log.Printf("Types are not equal (orig: %s, unmsh: %s)", commandInput.Type, commandUnmarshalled.Type)
-	}
 }
 
-func TestProxyConnectionResponseMarshalSupport(t *testing.T) {
+func TestProxyConnectionResponse(t *testing.T) {
 	commandInput := &ProxyInstanceResponse{
-		Type: "proxyInstanceResponse",
 		Proxies: []*ProxyInstance{
 			{
 				SourceIP:   "192.168.0.168",
@@ -765,7 +617,7 @@ func TestProxyConnectionResponseMarshalSupport(t *testing.T) {
 		},
 	}
 
-	commandMarshalled, err := Marshal(commandInput.Type, commandInput)
+	commandMarshalled, err := Marshal(commandInput)
 
 	if err != nil {
 		t.Fatal(err.Error())
@@ -776,28 +628,18 @@ func TestProxyConnectionResponseMarshalSupport(t *testing.T) {
 	}
 
 	buf := bytes.NewBuffer(commandMarshalled)
-	commandType, commandUnmarshalledRaw, err := Unmarshal(buf)
+	commandUnmarshalledRaw, err := Unmarshal(buf)
 
 	if err != nil {
 		t.Fatal(err.Error())
 	}
 
-	if commandType != commandInput.Type {
-		t.Fail()
-		log.Print("command type does not match up!")
-	}
-
 	commandUnmarshalled, ok := commandUnmarshalledRaw.(*ProxyInstanceResponse)
 
 	if !ok {
 		t.Fatal("failed typecast")
 	}
 
-	if commandInput.Type != commandUnmarshalled.Type {
-		t.Fail()
-		log.Printf("Types are not equal (orig: %s, unmsh: %s)", commandInput.Type, commandUnmarshalled.Type)
-	}
-
 	for proxyIndex, originalProxy := range commandInput.Proxies {
 		remoteProxy := commandUnmarshalled.Proxies[proxyIndex]
 

backend/commonbackend/unmarshal.go

@@ -142,11 +142,11 @@ func unmarshalIndividualProxyStruct(conn io.Reader) (*ProxyInstance, error) {
 	}, nil
 }
 
-func Unmarshal(conn io.Reader) (string, interface{}, error) {
+func Unmarshal(conn io.Reader) (interface{}, error) {
 	commandType := make([]byte, 1)
 
 	if _, err := conn.Read(commandType); err != nil {
-		return "", nil, fmt.Errorf("couldn't read command")
+		return nil, fmt.Errorf("couldn't read command")
 	}
 
 	switch commandType[0] {
@@ -154,28 +154,25 @@ func Unmarshal(conn io.Reader) (string, interface{}, error) {
 		argumentsLength := make([]byte, 2)
 
 		if _, err := conn.Read(argumentsLength); err != nil {
-			return "", nil, fmt.Errorf("couldn't read argument length")
+			return nil, fmt.Errorf("couldn't read argument length")
 		}
 
 		arguments := make([]byte, binary.BigEndian.Uint16(argumentsLength))
 
 		if _, err := conn.Read(arguments); err != nil {
-			return "", nil, fmt.Errorf("couldn't read arguments")
+			return nil, fmt.Errorf("couldn't read arguments")
 		}
 
-		return "start", &Start{
-			Type:      "start",
+		return &Start{
 			Arguments: arguments,
 		}, nil
 	case StopID:
-		return "stop", &Stop{
-			Type: "stop",
-		}, nil
+		return &Stop{}, nil
 	case AddProxyID:
 		ipVersion := make([]byte, 1)
 
 		if _, err := conn.Read(ipVersion); err != nil {
-			return "", nil, fmt.Errorf("couldn't read ip version")
+			return nil, fmt.Errorf("couldn't read ip version")
 		}
 
 		var ipSize uint8
@@ -185,45 +182,44 @@ func Unmarshal(conn io.Reader) (string, interface{}, error) {
 		} else if ipVersion[0] == 6 {
 			ipSize = IPv6Size
 		} else {
-			return "", nil, fmt.Errorf("invalid IP version recieved")
+			return nil, fmt.Errorf("invalid IP version recieved")
 		}
 
 		ip := make(net.IP, ipSize)
 
 		if _, err := conn.Read(ip); err != nil {
-			return "", nil, fmt.Errorf("couldn't read source IP")
+			return nil, fmt.Errorf("couldn't read source IP")
 		}
 
 		sourcePort := make([]byte, 2)
 
 		if _, err := conn.Read(sourcePort); err != nil {
-			return "", nil, fmt.Errorf("couldn't read source port")
+			return nil, fmt.Errorf("couldn't read source port")
 		}
 
 		destPort := make([]byte, 2)
 
 		if _, err := conn.Read(destPort); err != nil {
-			return "", nil, fmt.Errorf("couldn't read destination port")
+			return nil, fmt.Errorf("couldn't read destination port")
 		}
 
 		protocolBytes := make([]byte, 1)
 
 		if _, err := conn.Read(protocolBytes); err != nil {
-			return "", nil, fmt.Errorf("couldn't read protocol")
+			return nil, fmt.Errorf("couldn't read protocol")
 		}
 
 		var protocol string
 
 		if protocolBytes[0] == TCP {
 			protocol = "tcp"
-		} else if protocolBytes[1] == UDP {
+		} else if protocolBytes[0] == UDP {
 			protocol = "udp"
 		} else {
-			return "", nil, fmt.Errorf("invalid protocol")
+			return nil, fmt.Errorf("invalid protocol")
 		}
 
-		return "addProxy", &AddProxy{
-			Type:       "addProxy",
+		return &AddProxy{
 			SourceIP:   ip.String(),
 			SourcePort: binary.BigEndian.Uint16(sourcePort),
 			DestPort:   binary.BigEndian.Uint16(destPort),
@@ -233,7 +229,7 @@ func Unmarshal(conn io.Reader) (string, interface{}, error) {
 		ipVersion := make([]byte, 1)
 
 		if _, err := conn.Read(ipVersion); err != nil {
-			return "", nil, fmt.Errorf("couldn't read ip version")
+			return nil, fmt.Errorf("couldn't read ip version")
 		}
 
 		var ipSize uint8
@@ -243,45 +239,44 @@ func Unmarshal(conn io.Reader) (string, interface{}, error) {
 		} else if ipVersion[0] == 6 {
 			ipSize = IPv6Size
 		} else {
-			return "", nil, fmt.Errorf("invalid IP version recieved")
+			return nil, fmt.Errorf("invalid IP version recieved")
 		}
 
 		ip := make(net.IP, ipSize)
 
 		if _, err := conn.Read(ip); err != nil {
-			return "", nil, fmt.Errorf("couldn't read source IP")
+			return nil, fmt.Errorf("couldn't read source IP")
 		}
 
 		sourcePort := make([]byte, 2)
 
 		if _, err := conn.Read(sourcePort); err != nil {
-			return "", nil, fmt.Errorf("couldn't read source port")
+			return nil, fmt.Errorf("couldn't read source port")
 		}
 
 		destPort := make([]byte, 2)
 
 		if _, err := conn.Read(destPort); err != nil {
-			return "", nil, fmt.Errorf("couldn't read destination port")
+			return nil, fmt.Errorf("couldn't read destination port")
 		}
 
 		protocolBytes := make([]byte, 1)
 
 		if _, err := conn.Read(protocolBytes); err != nil {
-			return "", nil, fmt.Errorf("couldn't read protocol")
+			return nil, fmt.Errorf("couldn't read protocol")
 		}
 
 		var protocol string
 
 		if protocolBytes[0] == TCP {
 			protocol = "tcp"
-		} else if protocolBytes[1] == UDP {
+		} else if protocolBytes[0] == UDP {
 			protocol = "udp"
 		} else {
-			return "", nil, fmt.Errorf("invalid protocol")
+			return nil, fmt.Errorf("invalid protocol")
 		}
 
-		return "removeProxy", &RemoveProxy{
-			Type:       "removeProxy",
+		return &RemoveProxy{
 			SourceIP:   ip.String(),
 			SourcePort: binary.BigEndian.Uint16(sourcePort),
 			DestPort:   binary.BigEndian.Uint16(destPort),
@@ -301,13 +296,13 @@ func Unmarshal(conn io.Reader) (string, interface{}, error) {
 					break
 				}
 
-				return "", nil, err
+				return nil, err
 			}
 
 			connections = append(connections, connection)
 
 			if _, err := conn.Read(delimiter); err != nil {
-				return "", nil, fmt.Errorf("couldn't read delimiter")
+				return nil, fmt.Errorf("couldn't read delimiter")
 			}
 
 			if delimiter[0] == '\r' {
@@ -321,15 +316,14 @@ func Unmarshal(conn io.Reader) (string, interface{}, error) {
 			}
 		}
 
-		return "proxyConnectionsResponse", &ProxyConnectionsResponse{
-			Type:        "proxyConnectionsResponse",
+		return &ProxyConnectionsResponse{
 			Connections: connections,
 		}, errorReturn
 	case CheckClientParametersID:
 		ipVersion := make([]byte, 1)
 
 		if _, err := conn.Read(ipVersion); err != nil {
-			return "", nil, fmt.Errorf("couldn't read ip version")
+			return nil, fmt.Errorf("couldn't read ip version")
 		}
 
 		var ipSize uint8
@@ -339,45 +333,44 @@ func Unmarshal(conn io.Reader) (string, interface{}, error) {
 		} else if ipVersion[0] == 6 {
 			ipSize = IPv6Size
 		} else {
-			return "", nil, fmt.Errorf("invalid IP version recieved")
+			return nil, fmt.Errorf("invalid IP version recieved")
 		}
 
 		ip := make(net.IP, ipSize)
 
 		if _, err := conn.Read(ip); err != nil {
-			return "", nil, fmt.Errorf("couldn't read source IP")
+			return nil, fmt.Errorf("couldn't read source IP")
 		}
 
 		sourcePort := make([]byte, 2)
 
 		if _, err := conn.Read(sourcePort); err != nil {
-			return "", nil, fmt.Errorf("couldn't read source port")
+			return nil, fmt.Errorf("couldn't read source port")
 		}
 
 		destPort := make([]byte, 2)
 
 		if _, err := conn.Read(destPort); err != nil {
-			return "", nil, fmt.Errorf("couldn't read destination port")
+			return nil, fmt.Errorf("couldn't read destination port")
 		}
 
 		protocolBytes := make([]byte, 1)
 
 		if _, err := conn.Read(protocolBytes); err != nil {
-			return "", nil, fmt.Errorf("couldn't read protocol")
+			return nil, fmt.Errorf("couldn't read protocol")
 		}
 
 		var protocol string
 
 		if protocolBytes[0] == TCP {
 			protocol = "tcp"
-		} else if protocolBytes[1] == UDP {
+		} else if protocolBytes[0] == UDP {
 			protocol = "udp"
 		} else {
-			return "", nil, fmt.Errorf("invalid protocol")
+			return nil, fmt.Errorf("invalid protocol")
 		}
 
-		return "checkClientParameters", &CheckClientParameters{
-			Type:       "checkClientParameters",
+		return &CheckClientParameters{
 			SourceIP:   ip.String(),
 			SourcePort: binary.BigEndian.Uint16(sourcePort),
 			DestPort:   binary.BigEndian.Uint16(destPort),
@@ -387,24 +380,23 @@ func Unmarshal(conn io.Reader) (string, interface{}, error) {
 		argumentsLength := make([]byte, 2)
 
 		if _, err := conn.Read(argumentsLength); err != nil {
-			return "", nil, fmt.Errorf("couldn't read argument length")
+			return nil, fmt.Errorf("couldn't read argument length")
 		}
 
 		arguments := make([]byte, binary.BigEndian.Uint16(argumentsLength))
 
 		if _, err := conn.Read(arguments); err != nil {
-			return "", nil, fmt.Errorf("couldn't read arguments")
+			return nil, fmt.Errorf("couldn't read arguments")
 		}
 
-		return "checkServerParameters", &CheckServerParameters{
-			Type:      "checkServerParameters",
+		return &CheckServerParameters{
 			Arguments: arguments,
 		}, nil
 	case CheckParametersResponseID:
 		checkMethodByte := make([]byte, 1)
 
 		if _, err := conn.Read(checkMethodByte); err != nil {
-			return "", nil, fmt.Errorf("couldn't read check method byte")
+			return nil, fmt.Errorf("couldn't read check method byte")
 		}
 
 		var checkMethod string
@@ -414,19 +406,19 @@ func Unmarshal(conn io.Reader) (string, interface{}, error) {
 		} else if checkMethodByte[0] == CheckServerParametersID {
 			checkMethod = "checkServerParameters"
 		} else {
-			return "", nil, fmt.Errorf("invalid check method recieved")
+			return nil, fmt.Errorf("invalid check method recieved")
 		}
 
 		isValid := make([]byte, 1)
 
 		if _, err := conn.Read(isValid); err != nil {
-			return "", nil, fmt.Errorf("couldn't read isValid byte")
+			return nil, fmt.Errorf("couldn't read isValid byte")
 		}
 
 		messageLengthBytes := make([]byte, 2)
 
 		if _, err := conn.Read(messageLengthBytes); err != nil {
-			return "", nil, fmt.Errorf("couldn't read message length")
+			return nil, fmt.Errorf("couldn't read message length")
 		}
 
 		messageLength := binary.BigEndian.Uint16(messageLengthBytes)
@@ -436,14 +428,13 @@ func Unmarshal(conn io.Reader) (string, interface{}, error) {
 			messageBytes := make([]byte, messageLength)
 
 			if _, err := conn.Read(messageBytes); err != nil {
-				return "", nil, fmt.Errorf("couldn't read message")
+				return nil, fmt.Errorf("couldn't read message")
 			}
 
 			message = string(messageBytes)
 		}
 
-		return "checkParametersResponse", &CheckParametersResponse{
-			Type:         "checkParametersResponse",
+		return &CheckParametersResponse{
 			InResponseTo: checkMethod,
 			IsValid:      isValid[0] == 1,
 			Message:      message,
@@ -452,19 +443,19 @@ func Unmarshal(conn io.Reader) (string, interface{}, error) {
 		isRunning := make([]byte, 1)
 
 		if _, err := conn.Read(isRunning); err != nil {
-			return "", nil, fmt.Errorf("couldn't read isRunning field")
+			return nil, fmt.Errorf("couldn't read isRunning field")
 		}
 
 		statusCode := make([]byte, 1)
 
 		if _, err := conn.Read(statusCode); err != nil {
-			return "", nil, fmt.Errorf("couldn't read status code field")
+			return nil, fmt.Errorf("couldn't read status code field")
 		}
 
 		messageLengthBytes := make([]byte, 2)
 
 		if _, err := conn.Read(messageLengthBytes); err != nil {
-			return "", nil, fmt.Errorf("couldn't read message length")
+			return nil, fmt.Errorf("couldn't read message length")
 		}
 
 		messageLength := binary.BigEndian.Uint16(messageLengthBytes)
@@ -474,27 +465,24 @@ func Unmarshal(conn io.Reader) (string, interface{}, error) {
 			messageBytes := make([]byte, messageLength)
 
 			if _, err := conn.Read(messageBytes); err != nil {
-				return "", nil, fmt.Errorf("couldn't read message")
+				return nil, fmt.Errorf("couldn't read message")
 			}
 
 			message = string(messageBytes)
 		}
 
-		return "backendStatusResponse", &BackendStatusResponse{
-			Type:       "backendStatusResponse",
+		return &BackendStatusResponse{
 			IsRunning:  isRunning[0] == 1,
 			StatusCode: int(statusCode[0]),
 			Message:    message,
 		}, nil
 	case BackendStatusRequestID:
-		return "backendStatusRequest", &BackendStatusRequest{
-			Type: "backendStatusRequest",
-		}, nil
+		return &BackendStatusRequest{}, nil
 	case ProxyStatusRequestID:
 		ipVersion := make([]byte, 1)
 
 		if _, err := conn.Read(ipVersion); err != nil {
-			return "", nil, fmt.Errorf("couldn't read ip version")
+			return nil, fmt.Errorf("couldn't read ip version")
 		}
 
 		var ipSize uint8
@@ -504,45 +492,44 @@ func Unmarshal(conn io.Reader) (string, interface{}, error) {
 		} else if ipVersion[0] == 6 {
 			ipSize = IPv6Size
 		} else {
-			return "", nil, fmt.Errorf("invalid IP version recieved")
+			return nil, fmt.Errorf("invalid IP version recieved")
 		}
 
 		ip := make(net.IP, ipSize)
 
 		if _, err := conn.Read(ip); err != nil {
-			return "", nil, fmt.Errorf("couldn't read source IP")
+			return nil, fmt.Errorf("couldn't read source IP")
 		}
 
 		sourcePort := make([]byte, 2)
 
 		if _, err := conn.Read(sourcePort); err != nil {
-			return "", nil, fmt.Errorf("couldn't read source port")
+			return nil, fmt.Errorf("couldn't read source port")
 		}
 
 		destPort := make([]byte, 2)
 
 		if _, err := conn.Read(destPort); err != nil {
-			return "", nil, fmt.Errorf("couldn't read destination port")
+			return nil, fmt.Errorf("couldn't read destination port")
 		}
 
 		protocolBytes := make([]byte, 1)
 
 		if _, err := conn.Read(protocolBytes); err != nil {
-			return "", nil, fmt.Errorf("couldn't read protocol")
+			return nil, fmt.Errorf("couldn't read protocol")
 		}
 
 		var protocol string
 
 		if protocolBytes[0] == TCP {
 			protocol = "tcp"
-		} else if protocolBytes[1] == UDP {
+		} else if protocolBytes[0] == UDP {
 			protocol = "udp"
 		} else {
-			return "", nil, fmt.Errorf("invalid protocol")
+			return nil, fmt.Errorf("invalid protocol")
 		}
 
-		return "proxyStatusRequest", &ProxyStatusRequest{
-			Type:       "proxyStatusRequest",
+		return &ProxyStatusRequest{
 			SourceIP:   ip.String(),
 			SourcePort: binary.BigEndian.Uint16(sourcePort),
 			DestPort:   binary.BigEndian.Uint16(destPort),
@@ -552,7 +539,7 @@ func Unmarshal(conn io.Reader) (string, interface{}, error) {
 		ipVersion := make([]byte, 1)
 
 		if _, err := conn.Read(ipVersion); err != nil {
-			return "", nil, fmt.Errorf("couldn't read ip version")
+			return nil, fmt.Errorf("couldn't read ip version")
 		}
 
 		var ipSize uint8
@@ -562,51 +549,50 @@ func Unmarshal(conn io.Reader) (string, interface{}, error) {
 		} else if ipVersion[0] == 6 {
 			ipSize = IPv6Size
 		} else {
-			return "", nil, fmt.Errorf("invalid IP version recieved")
+			return nil, fmt.Errorf("invalid IP version recieved")
 		}
 
 		ip := make(net.IP, ipSize)
 
 		if _, err := conn.Read(ip); err != nil {
-			return "", nil, fmt.Errorf("couldn't read source IP")
+			return nil, fmt.Errorf("couldn't read source IP")
 		}
 
 		sourcePort := make([]byte, 2)
 
 		if _, err := conn.Read(sourcePort); err != nil {
-			return "", nil, fmt.Errorf("couldn't read source port")
+			return nil, fmt.Errorf("couldn't read source port")
 		}
 
 		destPort := make([]byte, 2)
 
 		if _, err := conn.Read(destPort); err != nil {
-			return "", nil, fmt.Errorf("couldn't read destination port")
+			return nil, fmt.Errorf("couldn't read destination port")
 		}
 
 		protocolBytes := make([]byte, 1)
 
 		if _, err := conn.Read(protocolBytes); err != nil {
-			return "", nil, fmt.Errorf("couldn't read protocol")
+			return nil, fmt.Errorf("couldn't read protocol")
 		}
 
 		var protocol string
 
 		if protocolBytes[0] == TCP {
 			protocol = "tcp"
-		} else if protocolBytes[1] == UDP {
+		} else if protocolBytes[0] == UDP {
 			protocol = "udp"
 		} else {
-			return "", nil, fmt.Errorf("invalid protocol")
+			return nil, fmt.Errorf("invalid protocol")
 		}
 
 		isActive := make([]byte, 1)
 
 		if _, err := conn.Read(isActive); err != nil {
-			return "", nil, fmt.Errorf("couldn't read isActive field")
+			return nil, fmt.Errorf("couldn't read isActive field")
 		}
 
-		return "proxyStatusResponse", &ProxyStatusResponse{
-			Type:       "proxyStatusResponse",
+		return &ProxyStatusResponse{
 			SourceIP:   ip.String(),
 			SourcePort: binary.BigEndian.Uint16(sourcePort),
 			DestPort:   binary.BigEndian.Uint16(destPort),
@@ -614,9 +600,7 @@ func Unmarshal(conn io.Reader) (string, interface{}, error) {
 			IsActive:   isActive[0] == 1,
 		}, nil
 	case ProxyInstanceRequestID:
-		return "proxyInstanceRequest", &ProxyInstanceRequest{
-			Type: "proxyInstanceRequest",
-		}, nil
+		return &ProxyInstanceRequest{}, nil
 	case ProxyInstanceResponseID:
 		proxies := []*ProxyInstance{}
 		delimiter := make([]byte, 1)
@@ -631,13 +615,13 @@ func Unmarshal(conn io.Reader) (string, interface{}, error) {
 					break
 				}
 
-				return "", nil, err
+				return nil, err
 			}
 
 			proxies = append(proxies, proxy)
 
 			if _, err := conn.Read(delimiter); err != nil {
-				return "", nil, fmt.Errorf("couldn't read delimiter")
+				return nil, fmt.Errorf("couldn't read delimiter")
 			}
 
 			if delimiter[0] == '\r' {
@@ -651,15 +635,12 @@ func Unmarshal(conn io.Reader) (string, interface{}, error) {
 			}
 		}
 
-		return "proxyInstanceResponse", &ProxyInstanceResponse{
-			Type:    "proxyInstanceResponse",
+		return &ProxyInstanceResponse{
 			Proxies: proxies,
 		}, errorReturn
 	case ProxyConnectionsRequestID:
-		return "proxyConnectionsRequest", &ProxyConnectionsRequest{
-			Type: "proxyConnectionsRequest",
-		}, nil
+		return &ProxyConnectionsRequest{}, nil
 	}
 
-	return "", nil, fmt.Errorf("couldn't match command ID")
+	return nil, fmt.Errorf("couldn't match command ID")
 }

backend/externalbackendlauncher/main.go

@@ -21,11 +21,8 @@ type ProxyInstance struct {
 	Protocol   string `json:"protocol"`
 }
 
-type WriteLogger struct {
-	UseError bool
-}
+type WriteLogger struct{}
 
-// TODO: deprecate UseError switching
 func (writer WriteLogger) Write(p []byte) (n int, err error) {
 	logSplit := strings.Split(string(p), "\n")
 
@@ -34,12 +31,8 @@ func (writer WriteLogger) Write(p []byte) (n int, err error) {
 			continue
 		}
 
-		if writer.UseError {
-			log.Errorf("application: %s", line)
-		} else {
 		log.Infof("application: %s", line)
 	}
-	}
 
 	return len(p), err
 }
@@ -119,11 +112,10 @@ func entrypoint(cCtx *cli.Context) error {
 			defer sock.Close()
 
 			startCommand := &commonbackend.Start{
-				Type:      "start",
 				Arguments: backendParameters,
 			}
 
-			startMarshalledCommand, err := commonbackend.Marshal("start", startCommand)
+			startMarshalledCommand, err := commonbackend.Marshal(startCommand)
 
 			if err != nil {
 				log.Errorf("failed to generate start command: %s", err.Error())
@@ -135,18 +127,13 @@ func entrypoint(cCtx *cli.Context) error {
 				continue
 			}
 
-			commandType, commandRaw, err := commonbackend.Unmarshal(sock)
+			commandRaw, err := commonbackend.Unmarshal(sock)
 
 			if err != nil {
 				log.Errorf("failed to read from/unmarshal from socket: %s", err.Error())
 				continue
 			}
 
-			if commandType != "backendStatusResponse" {
-				log.Errorf("recieved commandType '%s', expecting 'backendStatusResponse'", commandType)
-				continue
-			}
-
 			command, ok := commandRaw.(*commonbackend.BackendStatusResponse)
 
 			if !ok {
@@ -175,14 +162,13 @@ func entrypoint(cCtx *cli.Context) error {
 				log.Infof("initializing proxy %s:%d -> remote:%d", proxy.SourceIP, proxy.SourcePort, proxy.DestPort)
 
 				proxyAddCommand := &commonbackend.AddProxy{
-					Type:       "addProxy",
 					SourceIP:   proxy.SourceIP,
 					SourcePort: proxy.SourcePort,
 					DestPort:   proxy.DestPort,
 					Protocol:   proxy.Protocol,
 				}
 
-				marshalledProxyCommand, err := commonbackend.Marshal("addProxy", proxyAddCommand)
+				marshalledProxyCommand, err := commonbackend.Marshal(proxyAddCommand)
 
 				if err != nil {
 					log.Errorf("failed to generate start command: %s", err.Error())
@@ -196,7 +182,7 @@ func entrypoint(cCtx *cli.Context) error {
 					continue
 				}
 
-				commandType, commandRaw, err := commonbackend.Unmarshal(sock)
+				commandRaw, err := commonbackend.Unmarshal(sock)
 
 				if err != nil {
 					log.Errorf("failed to read from/unmarshal from socket: %s", err.Error())
@@ -204,12 +190,6 @@ func entrypoint(cCtx *cli.Context) error {
 					continue
 				}
 
-				if commandType != "proxyStatusResponse" {
-					log.Errorf("recieved commandType '%s', expecting 'proxyStatusResponse'", commandType)
-					hasAnyFailed = true
-					continue
-				}
-
 				command, ok := commandRaw.(*commonbackend.ProxyStatusResponse)
 
 				if !ok {
@@ -242,13 +222,8 @@ func entrypoint(cCtx *cli.Context) error {
 
 	log.Debug("entering execution loop (in main goroutine)...")
 
-	stdout := WriteLogger{
-		UseError: false,
-	}
-
-	stderr := WriteLogger{
-		UseError: true,
-	}
+	stdout := WriteLogger{}
+	stderr := WriteLogger{}
 
 	for {
 		log.Info("starting process...")

backend/sshappbackend/datacommands/constants.go

@@ -0,0 +1,90 @@
+package datacommands
+
+// DO NOT USE
+type ProxyStatusRequest struct {
+	ProxyID uint16
+}
+
+type ProxyStatusResponse struct {
+	ProxyID  uint16
+	IsActive bool
+}
+
+type RemoveProxy struct {
+	ProxyID uint16
+}
+
+type ProxyInstanceResponse struct {
+	Proxies []uint16
+}
+
+type ProxyConnectionsRequest struct {
+	ProxyID uint16
+}
+
+type ProxyConnectionsResponse struct {
+	Connections []uint16
+}
+
+type TCPConnectionOpened struct {
+	ProxyID      uint16
+	ConnectionID uint16
+}
+
+type TCPConnectionClosed struct {
+	ProxyID      uint16
+	ConnectionID uint16
+}
+
+type TCPProxyData struct {
+	ProxyID      uint16
+	ConnectionID uint16
+	DataLength   uint16
+}
+
+type UDPProxyData struct {
+	ProxyID    uint16
+	ClientIP   string
+	ClientPort uint16
+	DataLength uint16
+}
+
+type ProxyInformationRequest struct {
+	ProxyID uint16
+}
+
+type ProxyInformationResponse struct {
+	Exists     bool
+	SourceIP   string
+	SourcePort uint16
+	DestPort   uint16
+	Protocol   string // Will be either 'tcp' or 'udp'
+}
+
+type ProxyConnectionInformationRequest struct {
+	ProxyID      uint16
+	ConnectionID uint16
+}
+
+type ProxyConnectionInformationResponse struct {
+	Exists     bool
+	ClientIP   string
+	ClientPort uint16
+}
+
+const (
+	ProxyStatusRequestID = iota + 100
+	ProxyStatusResponseID
+	RemoveProxyID
+	ProxyInstanceResponseID
+	ProxyConnectionsRequestID
+	ProxyConnectionsResponseID
+	TCPConnectionOpenedID
+	TCPConnectionClosedID
+	TCPProxyDataID
+	UDPProxyDataID
+	ProxyInformationRequestID
+	ProxyInformationResponseID
+	ProxyConnectionInformationRequestID
+	ProxyConnectionInformationResponseID
+)

backend/sshappbackend/datacommands/marshal.go

@@ -0,0 +1,323 @@
+package datacommands
+
+import (
+	"encoding/binary"
+	"fmt"
+	"net"
+)
+
+// Example size and protocol constants — adjust as needed.
+const (
+	IPv4Size = 4
+	IPv6Size = 16
+
+	TCP = 1
+	UDP = 2
+)
+
+// Marshal takes a command (pointer to one of our structs) and converts it to a byte slice.
+func Marshal(command interface{}) ([]byte, error) {
+	switch cmd := command.(type) {
+	// ProxyStatusRequest: 1 byte for the command ID + 2 bytes for the ProxyID.
+	case *ProxyStatusRequest:
+		buf := make([]byte, 1+2)
+
+		buf[0] = ProxyStatusRequestID
+		binary.BigEndian.PutUint16(buf[1:], cmd.ProxyID)
+
+		return buf, nil
+
+	// ProxyStatusResponse: 1 byte for the command ID, 2 bytes for ProxyID, and 1 byte for IsActive.
+	case *ProxyStatusResponse:
+		buf := make([]byte, 1+2+1)
+
+		buf[0] = ProxyStatusResponseID
+		binary.BigEndian.PutUint16(buf[1:], cmd.ProxyID)
+
+		if cmd.IsActive {
+			buf[3] = 1
+		} else {
+			buf[3] = 0
+		}
+
+		return buf, nil
+
+	// RemoveProxy: 1 byte for the command ID + 2 bytes for the ProxyID.
+	case *RemoveProxy:
+		buf := make([]byte, 1+2)
+
+		buf[0] = RemoveProxyID
+		binary.BigEndian.PutUint16(buf[1:], cmd.ProxyID)
+
+		return buf, nil
+
+	// ProxyConnectionsRequest: 1 byte for the command ID + 2 bytes for the ProxyID.
+	case *ProxyConnectionsRequest:
+		buf := make([]byte, 1+2)
+
+		buf[0] = ProxyConnectionsRequestID
+		binary.BigEndian.PutUint16(buf[1:], cmd.ProxyID)
+
+		return buf, nil
+
+	// ProxyConnectionsResponse: 1 byte for the command ID + 2 bytes length of the Connections + 2 bytes for each
+	// number in the Connection array.
+	case *ProxyConnectionsResponse:
+		buf := make([]byte, 1+((len(cmd.Connections)+1)*2))
+
+		buf[0] = ProxyConnectionsResponseID
+		binary.BigEndian.PutUint16(buf[1:], uint16(len(cmd.Connections)))
+
+		for connectionIndex, connection := range cmd.Connections {
+			binary.BigEndian.PutUint16(buf[3+(connectionIndex*2):], connection)
+		}
+
+		return buf, nil
+
+	// ProxyConnectionsResponse: 1 byte for the command ID + 2 bytes length of the Proxies + 2 bytes for each
+	// number in the Proxies array.
+	case *ProxyInstanceResponse:
+		buf := make([]byte, 1+((len(cmd.Proxies)+1)*2))
+
+		buf[0] = ProxyInstanceResponseID
+		binary.BigEndian.PutUint16(buf[1:], uint16(len(cmd.Proxies)))
+
+		for connectionIndex, connection := range cmd.Proxies {
+			binary.BigEndian.PutUint16(buf[3+(connectionIndex*2):], connection)
+		}
+
+		return buf, nil
+
+	// TCPConnectionOpened: 1 byte for the command ID + 2 bytes ProxyID + 2 bytes ConnectionID.
+	case *TCPConnectionOpened:
+		buf := make([]byte, 1+2+2)
+
+		buf[0] = TCPConnectionOpenedID
+		binary.BigEndian.PutUint16(buf[1:], cmd.ProxyID)
+		binary.BigEndian.PutUint16(buf[3:], cmd.ConnectionID)
+
+		return buf, nil
+
+	// TCPConnectionClosed: 1 byte for the command ID + 2 bytes ProxyID + 2 bytes ConnectionID.
+	case *TCPConnectionClosed:
+		buf := make([]byte, 1+2+2)
+
+		buf[0] = TCPConnectionClosedID
+		binary.BigEndian.PutUint16(buf[1:], cmd.ProxyID)
+		binary.BigEndian.PutUint16(buf[3:], cmd.ConnectionID)
+
+		return buf, nil
+
+	// TCPProxyData: 1 byte ID + 2 bytes ProxyID + 2 bytes ConnectionID + 2 bytes DataLength.
+	case *TCPProxyData:
+		buf := make([]byte, 1+2+2+2)
+
+		buf[0] = TCPProxyDataID
+		binary.BigEndian.PutUint16(buf[1:], cmd.ProxyID)
+		binary.BigEndian.PutUint16(buf[3:], cmd.ConnectionID)
+		binary.BigEndian.PutUint16(buf[5:], cmd.DataLength)
+
+		return buf, nil
+
+	// UDPProxyData:
+	// Format: 1 byte ID + 2 bytes ProxyID + 2 bytes ConnectionID +
+	//         1 byte IP version + IP bytes + 2 bytes ClientPort + 2 bytes DataLength.
+	case *UDPProxyData:
+		ip := net.ParseIP(cmd.ClientIP)
+		if ip == nil {
+			return nil, fmt.Errorf("invalid client IP: %v", cmd.ClientIP)
+		}
+
+		var ipVer uint8
+		var ipBytes []byte
+
+		if ip4 := ip.To4(); ip4 != nil {
+			ipBytes = ip4
+			ipVer = 4
+		} else if ip16 := ip.To16(); ip16 != nil {
+			ipBytes = ip16
+			ipVer = 6
+		} else {
+			return nil, fmt.Errorf("unable to detect IP version for: %v", cmd.ClientIP)
+		}
+
+		totalSize := 1 + // id
+			2 + // ProxyID
+			1 + // IP version
+			len(ipBytes) + // client IP bytes
+			2 + // ClientPort
+			2 // DataLength
+
+		buf := make([]byte, totalSize)
+		offset := 0
+		buf[offset] = UDPProxyDataID
+		offset++
+
+		binary.BigEndian.PutUint16(buf[offset:], cmd.ProxyID)
+		offset += 2
+
+		buf[offset] = ipVer
+		offset++
+
+		copy(buf[offset:], ipBytes)
+		offset += len(ipBytes)
+
+		binary.BigEndian.PutUint16(buf[offset:], cmd.ClientPort)
+		offset += 2
+
+		binary.BigEndian.PutUint16(buf[offset:], cmd.DataLength)
+
+		return buf, nil
+
+	// ProxyInformationRequest: 1 byte ID + 2 bytes ProxyID.
+	case *ProxyInformationRequest:
+		buf := make([]byte, 1+2)
+		buf[0] = ProxyInformationRequestID
+		binary.BigEndian.PutUint16(buf[1:], cmd.ProxyID)
+		return buf, nil
+
+	// ProxyInformationResponse:
+	// Format: 1 byte ID + 1 byte Exists + (if exists:)
+	//         1 byte IP version + IP bytes + 2 bytes SourcePort + 2 bytes DestPort + 1 byte Protocol.
+	// (For simplicity, this marshaller always writes the IP and port info even if !Exists.)
+	case *ProxyInformationResponse:
+		if !cmd.Exists {
+			buf := make([]byte, 1+1)
+			buf[0] = ProxyInformationResponseID
+			buf[1] = 0 /* false */
+
+			return buf, nil
+		}
+
+		ip := net.ParseIP(cmd.SourceIP)
+
+		if ip == nil {
+			return nil, fmt.Errorf("invalid source IP: %v", cmd.SourceIP)
+		}
+
+		var ipVer uint8
+		var ipBytes []byte
+
+		if ip4 := ip.To4(); ip4 != nil {
+			ipBytes = ip4
+			ipVer = 4
+		} else if ip16 := ip.To16(); ip16 != nil {
+			ipBytes = ip16
+			ipVer = 6
+		} else {
+			return nil, fmt.Errorf("unable to detect IP version for: %v", cmd.SourceIP)
+		}
+
+		totalSize := 1 + // id
+			1 + // Exists flag
+			1 + // IP version
+			len(ipBytes) +
+			2 + // SourcePort
+			2 + // DestPort
+			1 // Protocol
+
+		buf := make([]byte, totalSize)
+
+		offset := 0
+		buf[offset] = ProxyInformationResponseID
+		offset++
+
+		// We already handle this above
+		buf[offset] = 1 /* true */
+		offset++
+
+		buf[offset] = ipVer
+		offset++
+
+		copy(buf[offset:], ipBytes)
+		offset += len(ipBytes)
+
+		binary.BigEndian.PutUint16(buf[offset:], cmd.SourcePort)
+		offset += 2
+
+		binary.BigEndian.PutUint16(buf[offset:], cmd.DestPort)
+		offset += 2
+
+		// Encode protocol as 1 byte.
+		switch cmd.Protocol {
+		case "tcp":
+			buf[offset] = TCP
+		case "udp":
+			buf[offset] = UDP
+		default:
+			return nil, fmt.Errorf("invalid protocol: %v", cmd.Protocol)
+		}
+
+		// offset++ (not needed since we are at the end)
+		return buf, nil
+
+	// ProxyConnectionInformationRequest: 1 byte ID + 2 bytes ProxyID + 2 bytes ConnectionID.
+	case *ProxyConnectionInformationRequest:
+		buf := make([]byte, 1+2+2)
+
+		buf[0] = ProxyConnectionInformationRequestID
+		binary.BigEndian.PutUint16(buf[1:], cmd.ProxyID)
+		binary.BigEndian.PutUint16(buf[3:], cmd.ConnectionID)
+
+		return buf, nil
+
+	// ProxyConnectionInformationResponse:
+	// Format: 1 byte ID + 1 byte Exists + (if exists:)
+	//         1 byte IP version + IP bytes + 2 bytes ClientPort.
+	// This marshaller only writes the rest of the data if Exists.
+	case *ProxyConnectionInformationResponse:
+		if !cmd.Exists {
+			buf := make([]byte, 1+1)
+			buf[0] = ProxyConnectionInformationResponseID
+			buf[1] = 0 /* false */
+
+			return buf, nil
+		}
+
+		ip := net.ParseIP(cmd.ClientIP)
+
+		if ip == nil {
+			return nil, fmt.Errorf("invalid client IP: %v", cmd.ClientIP)
+		}
+
+		var ipVer uint8
+		var ipBytes []byte
+		if ip4 := ip.To4(); ip4 != nil {
+			ipBytes = ip4
+			ipVer = 4
+		} else if ip16 := ip.To16(); ip16 != nil {
+			ipBytes = ip16
+			ipVer = 6
+		} else {
+			return nil, fmt.Errorf("unable to detect IP version for: %v", cmd.ClientIP)
+		}
+
+		totalSize := 1 + // id
+			1 + // Exists flag
+			1 + // IP version
+			len(ipBytes) +
+			2 // ClientPort
+
+		buf := make([]byte, totalSize)
+		offset := 0
+		buf[offset] = ProxyConnectionInformationResponseID
+		offset++
+
+		// We already handle this above
+		buf[offset] = 1 /* true */
+		offset++
+
+		buf[offset] = ipVer
+		offset++
+
+		copy(buf[offset:], ipBytes)
+		offset += len(ipBytes)
+
+		binary.BigEndian.PutUint16(buf[offset:], cmd.ClientPort)
+
+		return buf, nil
+
+	default:
+		return nil, fmt.Errorf("unsupported command type")
+	}
+}

backend/sshappbackend/datacommands/marshalling_test.go

@@ -0,0 +1,652 @@
+package datacommands
+
+import (
+	"bytes"
+	"log"
+	"os"
+	"testing"
+)
+
+var logLevel = os.Getenv("HERMES_LOG_LEVEL")
+
+func TestProxyStatusRequest(t *testing.T) {
+	commandInput := &ProxyStatusRequest{
+		ProxyID: 19132,
+	}
+
+	commandMarshalled, err := Marshal(commandInput)
+
+	if logLevel == "debug" {
+		log.Printf("Generated array contents: %v", commandMarshalled)
+	}
+
+	if err != nil {
+		t.Fatal(err.Error())
+	}
+
+	buf := bytes.NewBuffer(commandMarshalled)
+	commandUnmarshalledRaw, err := Unmarshal(buf)
+
+	if err != nil {
+		t.Fatal(err.Error())
+	}
+
+	commandUnmarshalled, ok := commandUnmarshalledRaw.(*ProxyStatusRequest)
+
+	if !ok {
+		t.Fatal("failed typecast")
+	}
+
+	if commandInput.ProxyID != commandUnmarshalled.ProxyID {
+		t.Fail()
+		log.Printf("ProxyID's are not equal (orig: '%d', unmsh: '%d')", commandInput.ProxyID, commandUnmarshalled.ProxyID)
+	}
+}
+
+func TestProxyStatusResponse(t *testing.T) {
+	commandInput := &ProxyStatusResponse{
+		ProxyID:  19132,
+		IsActive: true,
+	}
+
+	commandMarshalled, err := Marshal(commandInput)
+
+	if logLevel == "debug" {
+		log.Printf("Generated array contents: %v", commandMarshalled)
+	}
+
+	if err != nil {
+		t.Fatal(err.Error())
+	}
+
+	buf := bytes.NewBuffer(commandMarshalled)
+	commandUnmarshalledRaw, err := Unmarshal(buf)
+
+	if err != nil {
+		t.Fatal(err.Error())
+	}
+
+	commandUnmarshalled, ok := commandUnmarshalledRaw.(*ProxyStatusResponse)
+
+	if !ok {
+		t.Fatal("failed typecast")
+	}
+
+	if commandInput.ProxyID != commandUnmarshalled.ProxyID {
+		t.Fail()
+		log.Printf("ProxyID's are not equal (orig: '%d', unmsh: '%d')", commandInput.ProxyID, commandUnmarshalled.ProxyID)
+	}
+
+	if commandInput.IsActive != commandUnmarshalled.IsActive {
+		t.Fail()
+		log.Printf("IsActive's are not equal (orig: '%t', unmsh: '%t')", commandInput.IsActive, commandUnmarshalled.IsActive)
+	}
+}
+
+func TestRemoveProxy(t *testing.T) {
+	commandInput := &RemoveProxy{
+		ProxyID: 19132,
+	}
+
+	commandMarshalled, err := Marshal(commandInput)
+
+	if logLevel == "debug" {
+		log.Printf("Generated array contents: %v", commandMarshalled)
+	}
+
+	if err != nil {
+		t.Fatal(err.Error())
+	}
+
+	buf := bytes.NewBuffer(commandMarshalled)
+	commandUnmarshalledRaw, err := Unmarshal(buf)
+
+	if err != nil {
+		t.Fatal(err.Error())
+	}
+
+	commandUnmarshalled, ok := commandUnmarshalledRaw.(*RemoveProxy)
+
+	if !ok {
+		t.Fatal("failed typecast")
+	}
+
+	if commandInput.ProxyID != commandUnmarshalled.ProxyID {
+		t.Fail()
+		log.Printf("ProxyID's are not equal (orig: '%d', unmsh: '%d')", commandInput.ProxyID, commandUnmarshalled.ProxyID)
+	}
+}
+
+func TestProxyConnectionsRequest(t *testing.T) {
+	commandInput := &ProxyConnectionsRequest{
+		ProxyID: 19132,
+	}
+
+	commandMarshalled, err := Marshal(commandInput)
+
+	if logLevel == "debug" {
+		log.Printf("Generated array contents: %v", commandMarshalled)
+	}
+
+	if err != nil {
+		t.Fatal(err.Error())
+	}
+
+	buf := bytes.NewBuffer(commandMarshalled)
+	commandUnmarshalledRaw, err := Unmarshal(buf)
+
+	if err != nil {
+		t.Fatal(err.Error())
+	}
+
+	commandUnmarshalled, ok := commandUnmarshalledRaw.(*ProxyConnectionsRequest)
+
+	if !ok {
+		t.Fatal("failed typecast")
+	}
+
+	if commandInput.ProxyID != commandUnmarshalled.ProxyID {
+		t.Fail()
+		log.Printf("ProxyID's are not equal (orig: '%d', unmsh: '%d')", commandInput.ProxyID, commandUnmarshalled.ProxyID)
+	}
+}
+
+func TestProxyConnectionsResponse(t *testing.T) {
+	commandInput := &ProxyConnectionsResponse{
+		Connections: []uint16{12831, 9455, 64219, 12, 32},
+	}
+
+	commandMarshalled, err := Marshal(commandInput)
+
+	if logLevel == "debug" {
+		log.Printf("Generated array contents: %v", commandMarshalled)
+	}
+
+	if err != nil {
+		t.Fatal(err.Error())
+	}
+
+	buf := bytes.NewBuffer(commandMarshalled)
+	commandUnmarshalledRaw, err := Unmarshal(buf)
+
+	if err != nil {
+		t.Fatal(err.Error())
+	}
+
+	commandUnmarshalled, ok := commandUnmarshalledRaw.(*ProxyConnectionsResponse)
+
+	if !ok {
+		t.Fatal("failed typecast")
+	}
+
+	for connectionIndex, originalConnection := range commandInput.Connections {
+		remoteConnection := commandUnmarshalled.Connections[connectionIndex]
+
+		if originalConnection != remoteConnection {
+			t.Fail()
+			log.Printf("(in #%d) SourceIP's are not equal (orig: %d, unmsh: %d)", connectionIndex, originalConnection, connectionIndex)
+		}
+	}
+}
+
+func TestProxyInstanceResponse(t *testing.T) {
+	commandInput := &ProxyInstanceResponse{
+		Proxies: []uint16{12831, 9455, 64219, 12, 32},
+	}
+
+	commandMarshalled, err := Marshal(commandInput)
+
+	if logLevel == "debug" {
+		log.Printf("Generated array contents: %v", commandMarshalled)
+	}
+
+	if err != nil {
+		t.Fatal(err.Error())
+	}
+
+	buf := bytes.NewBuffer(commandMarshalled)
+	commandUnmarshalledRaw, err := Unmarshal(buf)
+
+	if err != nil {
+		t.Fatal(err.Error())
+	}
+
+	commandUnmarshalled, ok := commandUnmarshalledRaw.(*ProxyInstanceResponse)
+
+	if !ok {
+		t.Fatal("failed typecast")
+	}
+
+	for proxyIndex, originalProxy := range commandInput.Proxies {
+		remoteProxy := commandUnmarshalled.Proxies[proxyIndex]
+
+		if originalProxy != remoteProxy {
+			t.Fail()
+			log.Printf("(in #%d) Proxy IDs are not equal (orig: %d, unmsh: %d)", proxyIndex, originalProxy, remoteProxy)
+		}
+	}
+}
+
+func TestTCPConnectionOpened(t *testing.T) {
+	commandInput := &TCPConnectionOpened{
+		ProxyID:      19132,
+		ConnectionID: 25565,
+	}
+
+	commandMarshalled, err := Marshal(commandInput)
+
+	if logLevel == "debug" {
+		log.Printf("Generated array contents: %v", commandMarshalled)
+	}
+
+	if err != nil {
+		t.Fatal(err.Error())
+	}
+
+	buf := bytes.NewBuffer(commandMarshalled)
+	commandUnmarshalledRaw, err := Unmarshal(buf)
+
+	if err != nil {
+		t.Fatal(err.Error())
+	}
+
+	commandUnmarshalled, ok := commandUnmarshalledRaw.(*TCPConnectionOpened)
+
+	if !ok {
+		t.Fatal("failed typecast")
+	}
+
+	if commandInput.ProxyID != commandUnmarshalled.ProxyID {
+		t.Fail()
+		log.Printf("ProxyID's are not equal (orig: '%d', unmsh: '%d')", commandInput.ProxyID, commandUnmarshalled.ProxyID)
+	}
+
+	if commandInput.ConnectionID != commandUnmarshalled.ConnectionID {
+		t.Fail()
+		log.Printf("ConnectionID's are not equal (orig: '%d', unmsh: '%d')", commandInput.ConnectionID, commandUnmarshalled.ConnectionID)
+	}
+}
+
+func TestTCPConnectionClosed(t *testing.T) {
+	commandInput := &TCPConnectionClosed{
+		ProxyID:      19132,
+		ConnectionID: 25565,
+	}
+
+	commandMarshalled, err := Marshal(commandInput)
+
+	if logLevel == "debug" {
+		log.Printf("Generated array contents: %v", commandMarshalled)
+	}
+
+	if err != nil {
+		t.Fatal(err.Error())
+	}
+
+	buf := bytes.NewBuffer(commandMarshalled)
+	commandUnmarshalledRaw, err := Unmarshal(buf)
+
+	if err != nil {
+		t.Fatal(err.Error())
+	}
+
+	commandUnmarshalled, ok := commandUnmarshalledRaw.(*TCPConnectionClosed)
+
+	if !ok {
+		t.Fatal("failed typecast")
+	}
+
+	if commandInput.ProxyID != commandUnmarshalled.ProxyID {
+		t.Fail()
+		log.Printf("ProxyID's are not equal (orig: '%d', unmsh: '%d')", commandInput.ProxyID, commandUnmarshalled.ProxyID)
+	}
+
+	if commandInput.ConnectionID != commandUnmarshalled.ConnectionID {
+		t.Fail()
+		log.Printf("ConnectionID's are not equal (orig: '%d', unmsh: '%d')", commandInput.ConnectionID, commandUnmarshalled.ConnectionID)
+	}
+}
+
+func TestTCPProxyData(t *testing.T) {
+	commandInput := &TCPProxyData{
+		ProxyID:      19132,
+		ConnectionID: 25565,
+		DataLength:   1234,
+	}
+
+	commandMarshalled, err := Marshal(commandInput)
+
+	if logLevel == "debug" {
+		log.Printf("Generated array contents: %v", commandMarshalled)
+	}
+
+	if err != nil {
+		t.Fatal(err.Error())
+	}
+
+	buf := bytes.NewBuffer(commandMarshalled)
+	commandUnmarshalledRaw, err := Unmarshal(buf)
+
+	if err != nil {
+		t.Fatal(err.Error())
+	}
+
+	commandUnmarshalled, ok := commandUnmarshalledRaw.(*TCPProxyData)
+
+	if !ok {
+		t.Fatal("failed typecast")
+	}
+
+	if commandInput.ProxyID != commandUnmarshalled.ProxyID {
+		t.Fail()
+		log.Printf("ProxyID's are not equal (orig: '%d', unmsh: '%d')", commandInput.ProxyID, commandUnmarshalled.ProxyID)
+	}
+
+	if commandInput.ConnectionID != commandUnmarshalled.ConnectionID {
+		t.Fail()
+		log.Printf("ConnectionID's are not equal (orig: '%d', unmsh: '%d')", commandInput.ConnectionID, commandUnmarshalled.ConnectionID)
+	}
+
+	if commandInput.DataLength != commandUnmarshalled.DataLength {
+		t.Fail()
+		log.Printf("DataLength's are not equal (orig: '%d', unmsh: '%d')", commandInput.DataLength, commandUnmarshalled.DataLength)
+	}
+}
+
+func TestUDPProxyData(t *testing.T) {
+	commandInput := &UDPProxyData{
+		ProxyID:    19132,
+		ClientIP:   "68.51.23.54",
+		ClientPort: 28173,
+		DataLength: 1234,
+	}
+
+	commandMarshalled, err := Marshal(commandInput)
+
+	if logLevel == "debug" {
+		log.Printf("Generated array contents: %v", commandMarshalled)
+	}
+
+	if err != nil {
+		t.Fatal(err.Error())
+	}
+
+	buf := bytes.NewBuffer(commandMarshalled)
+	commandUnmarshalledRaw, err := Unmarshal(buf)
+
+	if err != nil {
+		t.Fatal(err.Error())
+	}
+
+	commandUnmarshalled, ok := commandUnmarshalledRaw.(*UDPProxyData)
+
+	if !ok {
+		t.Fatal("failed typecast")
+	}
+
+	if commandInput.ProxyID != commandUnmarshalled.ProxyID {
+		t.Fail()
+		log.Printf("ProxyID's are not equal (orig: '%d', unmsh: '%d')", commandInput.ProxyID, commandUnmarshalled.ProxyID)
+	}
+
+	if commandInput.ClientIP != commandUnmarshalled.ClientIP {
+		t.Fail()
+		log.Printf("ClientIP's are not equal (orig: '%s', unmsh: '%s')", commandInput.ClientIP, commandUnmarshalled.ClientIP)
+	}
+
+	if commandInput.ClientPort != commandUnmarshalled.ClientPort {
+		t.Fail()
+		log.Printf("ClientPort's are not equal (orig: '%d', unmsh: '%d')", commandInput.ClientPort, commandUnmarshalled.ClientPort)
+	}
+
+	if commandInput.DataLength != commandUnmarshalled.DataLength {
+		t.Fail()
+		log.Printf("DataLength's are not equal (orig: '%d', unmsh: '%d')", commandInput.DataLength, commandUnmarshalled.DataLength)
+	}
+}
+
+func TestProxyInformationRequest(t *testing.T) {
+	commandInput := &ProxyInformationRequest{
+		ProxyID: 19132,
+	}
+
+	commandMarshalled, err := Marshal(commandInput)
+
+	if logLevel == "debug" {
+		log.Printf("Generated array contents: %v", commandMarshalled)
+	}
+
+	if err != nil {
+		t.Fatal(err.Error())
+	}
+
+	buf := bytes.NewBuffer(commandMarshalled)
+	commandUnmarshalledRaw, err := Unmarshal(buf)
+
+	if err != nil {
+		t.Fatal(err.Error())
+	}
+
+	commandUnmarshalled, ok := commandUnmarshalledRaw.(*ProxyInformationRequest)
+
+	if !ok {
+		t.Fatal("failed typecast")
+	}
+
+	if commandInput.ProxyID != commandUnmarshalled.ProxyID {
+		t.Fail()
+		log.Printf("ProxyID's are not equal (orig: '%d', unmsh: '%d')", commandInput.ProxyID, commandUnmarshalled.ProxyID)
+	}
+}
+
+func TestProxyInformationResponseExists(t *testing.T) {
+	commandInput := &ProxyInformationResponse{
+		Exists:     true,
+		SourceIP:   "192.168.0.139",
+		SourcePort: 19132,
+		DestPort:   19132,
+		Protocol:   "tcp",
+	}
+
+	commandMarshalled, err := Marshal(commandInput)
+
+	if err != nil {
+		t.Fatal(err.Error())
+	}
+
+	if logLevel == "debug" {
+		log.Printf("Generated array contents: %v", commandMarshalled)
+	}
+
+	buf := bytes.NewBuffer(commandMarshalled)
+	commandUnmarshalledRaw, err := Unmarshal(buf)
+
+	if err != nil {
+		t.Fatal(err.Error())
+	}
+
+	commandUnmarshalled, ok := commandUnmarshalledRaw.(*ProxyInformationResponse)
+
+	if !ok {
+		t.Fatal("failed typecast")
+	}
+
+	if commandInput.Exists != commandUnmarshalled.Exists {
+		t.Fail()
+		log.Printf("Exists's are not equal (orig: '%t', unmsh: '%t')", commandInput.Exists, commandUnmarshalled.Exists)
+	}
+
+	if commandInput.SourceIP != commandUnmarshalled.SourceIP {
+		t.Fail()
+		log.Printf("SourceIP's are not equal (orig: %s, unmsh: %s)", commandInput.SourceIP, commandUnmarshalled.SourceIP)
+	}
+
+	if commandInput.SourcePort != commandUnmarshalled.SourcePort {
+		t.Fail()
+		log.Printf("SourcePort's are not equal (orig: %d, unmsh: %d)", commandInput.SourcePort, commandUnmarshalled.SourcePort)
+	}
+
+	if commandInput.DestPort != commandUnmarshalled.DestPort {
+		t.Fail()
+		log.Printf("DestPort's are not equal (orig: %d, unmsh: %d)", commandInput.DestPort, commandUnmarshalled.DestPort)
+	}
+
+	if commandInput.Protocol != commandUnmarshalled.Protocol {
+		t.Fail()
+		log.Printf("Protocols are not equal (orig: %s, unmsh: %s)", commandInput.Protocol, commandUnmarshalled.Protocol)
+	}
+}
+
+func TestProxyInformationResponseNoExist(t *testing.T) {
+	commandInput := &ProxyInformationResponse{
+		Exists: false,
+	}
+
+	commandMarshalled, err := Marshal(commandInput)
+
+	if err != nil {
+		t.Fatal(err.Error())
+	}
+
+	if logLevel == "debug" {
+		log.Printf("Generated array contents: %v", commandMarshalled)
+	}
+
+	buf := bytes.NewBuffer(commandMarshalled)
+	commandUnmarshalledRaw, err := Unmarshal(buf)
+
+	if err != nil {
+		t.Fatal(err.Error())
+	}
+
+	commandUnmarshalled, ok := commandUnmarshalledRaw.(*ProxyInformationResponse)
+
+	if !ok {
+		t.Fatal("failed typecast")
+	}
+
+	if commandInput.Exists != commandUnmarshalled.Exists {
+		t.Fail()
+		log.Printf("Exists's are not equal (orig: '%t', unmsh: '%t')", commandInput.Exists, commandUnmarshalled.Exists)
+	}
+}
+
+func TestProxyConnectionInformationRequest(t *testing.T) {
+	commandInput := &ProxyConnectionInformationRequest{
+		ProxyID:      19132,
+		ConnectionID: 25565,
+	}
+
+	commandMarshalled, err := Marshal(commandInput)
+
+	if logLevel == "debug" {
+		log.Printf("Generated array contents: %v", commandMarshalled)
+	}
+
+	if err != nil {
+		t.Fatal(err.Error())
+	}
+
+	buf := bytes.NewBuffer(commandMarshalled)
+	commandUnmarshalledRaw, err := Unmarshal(buf)
+
+	if err != nil {
+		t.Fatal(err.Error())
+	}
+
+	commandUnmarshalled, ok := commandUnmarshalledRaw.(*ProxyConnectionInformationRequest)
+
+	if !ok {
+		t.Fatal("failed typecast")
+	}
+
+	if commandInput.ProxyID != commandUnmarshalled.ProxyID {
+		t.Fail()
+		log.Printf("ProxyID's are not equal (orig: '%d', unmsh: '%d')", commandInput.ProxyID, commandUnmarshalled.ProxyID)
+	}
+
+	if commandInput.ConnectionID != commandUnmarshalled.ConnectionID {
+		t.Fail()
+		log.Printf("ConnectionID's are not equal (orig: '%d', unmsh: '%d')", commandInput.ConnectionID, commandUnmarshalled.ConnectionID)
+	}
+}
+
+func TestProxyConnectionInformationResponseExists(t *testing.T) {
+	commandInput := &ProxyConnectionInformationResponse{
+		Exists:     true,
+		ClientIP:   "192.168.0.139",
+		ClientPort: 19132,
+	}
+
+	commandMarshalled, err := Marshal(commandInput)
+
+	if err != nil {
+		t.Fatal(err.Error())
+	}
+
+	if logLevel == "debug" {
+		log.Printf("Generated array contents: %v", commandMarshalled)
+	}
+
+	buf := bytes.NewBuffer(commandMarshalled)
+	commandUnmarshalledRaw, err := Unmarshal(buf)
+
+	if err != nil {
+		t.Fatal(err.Error())
+	}
+
+	commandUnmarshalled, ok := commandUnmarshalledRaw.(*ProxyConnectionInformationResponse)
+
+	if !ok {
+		t.Fatal("failed typecast")
+	}
+
+	if commandInput.Exists != commandUnmarshalled.Exists {
+		t.Fail()
+		log.Printf("Exists's are not equal (orig: '%t', unmsh: '%t')", commandInput.Exists, commandUnmarshalled.Exists)
+	}
+
+	if commandInput.ClientIP != commandUnmarshalled.ClientIP {
+		t.Fail()
+		log.Printf("SourceIP's are not equal (orig: %s, unmsh: %s)", commandInput.ClientIP, commandUnmarshalled.ClientIP)
+	}
+
+	if commandInput.ClientPort != commandUnmarshalled.ClientPort {
+		t.Fail()
+		log.Printf("ClientPort's are not equal (orig: %d, unmsh: %d)", commandInput.ClientPort, commandUnmarshalled.ClientPort)
+	}
+}
+
+func TestProxyConnectionInformationResponseNoExists(t *testing.T) {
+	commandInput := &ProxyConnectionInformationResponse{
+		Exists: false,
+	}
+
+	commandMarshalled, err := Marshal(commandInput)
+
+	if err != nil {
+		t.Fatal(err.Error())
+	}
+
+	if logLevel == "debug" {
+		log.Printf("Generated array contents: %v", commandMarshalled)
+	}
+
+	buf := bytes.NewBuffer(commandMarshalled)
+	commandUnmarshalledRaw, err := Unmarshal(buf)
+
+	if err != nil {
+		t.Fatal(err.Error())
+	}
+
+	commandUnmarshalled, ok := commandUnmarshalledRaw.(*ProxyConnectionInformationResponse)
+
+	if !ok {
+		t.Fatal("failed typecast")
+	}
+
+	if commandInput.Exists != commandUnmarshalled.Exists {
+		t.Fail()
+		log.Printf("Exists's are not equal (orig: '%t', unmsh: '%t')", commandInput.Exists, commandUnmarshalled.Exists)
+	}
+}

backend/sshappbackend/datacommands/unmarshal.go

@@ -0,0 +1,422 @@
+package datacommands
+
+import (
+	"encoding/binary"
+	"fmt"
+	"io"
+	"net"
+)
+
+// Unmarshal reads from the provided connection and returns
+// the message type (as a string), the unmarshalled struct, or an error.
+func Unmarshal(conn io.Reader) (interface{}, error) {
+	// Every command starts with a 1-byte command ID.
+	header := make([]byte, 1)
+
+	if _, err := io.ReadFull(conn, header); err != nil {
+		return nil, fmt.Errorf("couldn't read command ID: %w", err)
+	}
+
+	cmdID := header[0]
+	switch cmdID {
+	// ProxyStatusRequest: 1 byte ID + 2 bytes ProxyID.
+	case ProxyStatusRequestID:
+		buf := make([]byte, 2)
+
+		if _, err := io.ReadFull(conn, buf); err != nil {
+			return nil, fmt.Errorf("couldn't read ProxyStatusRequest ProxyID: %w", err)
+		}
+
+		proxyID := binary.BigEndian.Uint16(buf)
+
+		return &ProxyStatusRequest{
+			ProxyID: proxyID,
+		}, nil
+
+	// ProxyStatusResponse: 1 byte ID + 2 bytes ProxyID + 1 byte IsActive.
+	case ProxyStatusResponseID:
+		buf := make([]byte, 2)
+
+		if _, err := io.ReadFull(conn, buf); err != nil {
+			return nil, fmt.Errorf("couldn't read ProxyStatusResponse ProxyID: %w", err)
+		}
+
+		proxyID := binary.BigEndian.Uint16(buf)
+		boolBuf := make([]byte, 1)
+
+		if _, err := io.ReadFull(conn, boolBuf); err != nil {
+			return nil, fmt.Errorf("couldn't read ProxyStatusResponse IsActive: %w", err)
+		}
+
+		isActive := boolBuf[0] != 0
+
+		return &ProxyStatusResponse{
+			ProxyID:  proxyID,
+			IsActive: isActive,
+		}, nil
+
+	// RemoveProxy: 1 byte ID + 2 bytes ProxyID.
+	case RemoveProxyID:
+		buf := make([]byte, 2)
+
+		if _, err := io.ReadFull(conn, buf); err != nil {
+			return nil, fmt.Errorf("couldn't read RemoveProxy ProxyID: %w", err)
+		}
+
+		proxyID := binary.BigEndian.Uint16(buf)
+
+		return &RemoveProxy{
+			ProxyID: proxyID,
+		}, nil
+
+	// ProxyConnectionsRequest: 1 byte ID + 2 bytes ProxyID.
+	case ProxyConnectionsRequestID:
+		buf := make([]byte, 2)
+
+		if _, err := io.ReadFull(conn, buf); err != nil {
+			return nil, fmt.Errorf("couldn't read ProxyConnectionsRequest ProxyID: %w", err)
+		}
+
+		proxyID := binary.BigEndian.Uint16(buf)
+
+		return &ProxyConnectionsRequest{
+			ProxyID: proxyID,
+		}, nil
+
+	// ProxyConnectionsResponse: 1 byte ID + 2 bytes Connections length + 2 bytes for each Connection in Connections.
+	case ProxyConnectionsResponseID:
+		buf := make([]byte, 2)
+
+		if _, err := io.ReadFull(conn, buf); err != nil {
+			return nil, fmt.Errorf("couldn't read ProxyConnectionsResponse length: %w", err)
+		}
+
+		length := binary.BigEndian.Uint16(buf)
+		connections := make([]uint16, length)
+
+		var failedDuringReading error
+
+		for connectionIndex := range connections {
+			if _, err := io.ReadFull(conn, buf); err != nil {
+				failedDuringReading = fmt.Errorf("couldn't read ProxyConnectionsResponse with position of %d: %w", connectionIndex, err)
+				break
+			}
+
+			connections[connectionIndex] = binary.BigEndian.Uint16(buf)
+		}
+
+		return &ProxyConnectionsResponse{
+			Connections: connections,
+		}, failedDuringReading
+
+	// ProxyInstanceResponse: 1 byte ID + 2 bytes Proxies length + 2 bytes for each Proxy in Proxies.
+	case ProxyInstanceResponseID:
+		buf := make([]byte, 2)
+
+		if _, err := io.ReadFull(conn, buf); err != nil {
+			return nil, fmt.Errorf("couldn't read ProxyConnectionsResponse length: %w", err)
+		}
+
+		length := binary.BigEndian.Uint16(buf)
+		proxies := make([]uint16, length)
+
+		var failedDuringReading error
+
+		for connectionIndex := range proxies {
+			if _, err := io.ReadFull(conn, buf); err != nil {
+				failedDuringReading = fmt.Errorf("couldn't read ProxyConnectionsResponse with position of %d: %w", connectionIndex, err)
+				break
+			}
+
+			proxies[connectionIndex] = binary.BigEndian.Uint16(buf)
+		}
+
+		return &ProxyInstanceResponse{
+			Proxies: proxies,
+		}, failedDuringReading
+
+	// TCPConnectionOpened: 1 byte ID + 2 bytes ProxyID + 2 bytes ConnectionID.
+	case TCPConnectionOpenedID:
+		buf := make([]byte, 2+2)
+
+		if _, err := io.ReadFull(conn, buf); err != nil {
+			return nil, fmt.Errorf("couldn't read TCPConnectionOpened fields: %w", err)
+		}
+
+		proxyID := binary.BigEndian.Uint16(buf[0:2])
+		connectionID := binary.BigEndian.Uint16(buf[2:4])
+
+		return &TCPConnectionOpened{
+			ProxyID:      proxyID,
+			ConnectionID: connectionID,
+		}, nil
+
+	// TCPConnectionClosed: 1 byte ID + 2 bytes ProxyID + 2 bytes ConnectionID.
+	case TCPConnectionClosedID:
+		buf := make([]byte, 2+2)
+
+		if _, err := io.ReadFull(conn, buf); err != nil {
+			return nil, fmt.Errorf("couldn't read TCPConnectionClosed fields: %w", err)
+		}
+
+		proxyID := binary.BigEndian.Uint16(buf[0:2])
+		connectionID := binary.BigEndian.Uint16(buf[2:4])
+
+		return &TCPConnectionClosed{
+			ProxyID:      proxyID,
+			ConnectionID: connectionID,
+		}, nil
+
+	// TCPProxyData: 1 byte ID + 2 bytes ProxyID + 2 bytes ConnectionID + 2 bytes DataLength.
+	case TCPProxyDataID:
+		buf := make([]byte, 2+2+2)
+
+		if _, err := io.ReadFull(conn, buf); err != nil {
+			return nil, fmt.Errorf("couldn't read TCPProxyData fields: %w", err)
+		}
+
+		proxyID := binary.BigEndian.Uint16(buf[0:2])
+		connectionID := binary.BigEndian.Uint16(buf[2:4])
+		dataLength := binary.BigEndian.Uint16(buf[4:6])
+
+		return &TCPProxyData{
+			ProxyID:      proxyID,
+			ConnectionID: connectionID,
+			DataLength:   dataLength,
+		}, nil
+
+	// UDPProxyData:
+	// Format: 1 byte ID + 2 bytes ProxyID + 2 bytes ConnectionID +
+	//         1 byte IP version + IP bytes + 2 bytes ClientPort + 2 bytes DataLength.
+	case UDPProxyDataID:
+		// Read 2 bytes ProxyID + 2 bytes ConnectionID.
+		buf := make([]byte, 2)
+
+		if _, err := io.ReadFull(conn, buf); err != nil {
+			return nil, fmt.Errorf("couldn't read UDPProxyData ProxyID/ConnectionID: %w", err)
+		}
+
+		proxyID := binary.BigEndian.Uint16(buf)
+
+		// Read IP version.
+		ipVerBuf := make([]byte, 1)
+
+		if _, err := io.ReadFull(conn, ipVerBuf); err != nil {
+			return nil, fmt.Errorf("couldn't read UDPProxyData IP version: %w", err)
+		}
+
+		var ipSize int
+
+		if ipVerBuf[0] == 4 {
+			ipSize = IPv4Size
+		} else if ipVerBuf[0] == 6 {
+			ipSize = IPv6Size
+		} else {
+			return nil, fmt.Errorf("invalid IP version received: %v", ipVerBuf[0])
+		}
+
+		// Read the IP bytes.
+		ipBytes := make([]byte, ipSize)
+		if _, err := io.ReadFull(conn, ipBytes); err != nil {
+			return nil, fmt.Errorf("couldn't read UDPProxyData IP bytes: %w", err)
+		}
+		clientIP := net.IP(ipBytes).String()
+
+		// Read ClientPort.
+		portBuf := make([]byte, 2)
+
+		if _, err := io.ReadFull(conn, portBuf); err != nil {
+			return nil, fmt.Errorf("couldn't read UDPProxyData ClientPort: %w", err)
+		}
+
+		clientPort := binary.BigEndian.Uint16(portBuf)
+
+		// Read DataLength.
+		dataLengthBuf := make([]byte, 2)
+
+		if _, err := io.ReadFull(conn, dataLengthBuf); err != nil {
+			return nil, fmt.Errorf("couldn't read UDPProxyData DataLength: %w", err)
+		}
+
+		dataLength := binary.BigEndian.Uint16(dataLengthBuf)
+
+		return &UDPProxyData{
+			ProxyID:    proxyID,
+			ClientIP:   clientIP,
+			ClientPort: clientPort,
+			DataLength: dataLength,
+		}, nil
+
+	// ProxyInformationRequest: 1 byte ID + 2 bytes ProxyID.
+	case ProxyInformationRequestID:
+		buf := make([]byte, 2)
+
+		if _, err := io.ReadFull(conn, buf); err != nil {
+			return nil, fmt.Errorf("couldn't read ProxyInformationRequest ProxyID: %w", err)
+		}
+
+		proxyID := binary.BigEndian.Uint16(buf)
+
+		return &ProxyInformationRequest{
+			ProxyID: proxyID,
+		}, nil
+
+	// ProxyInformationResponse:
+	// Format: 1 byte ID + 1 byte Exists +
+	//         1 byte IP version + IP bytes + 2 bytes SourcePort + 2 bytes DestPort + 1 byte Protocol.
+	case ProxyInformationResponseID:
+		// Read Exists flag.
+		boolBuf := make([]byte, 1)
+
+		if _, err := io.ReadFull(conn, boolBuf); err != nil {
+			return nil, fmt.Errorf("couldn't read ProxyInformationResponse Exists flag: %w", err)
+		}
+
+		exists := boolBuf[0] != 0
+
+		if !exists {
+			return &ProxyInformationResponse{
+				Exists: exists,
+			}, nil
+		}
+
+		// Read IP version.
+		ipVerBuf := make([]byte, 1)
+
+		if _, err := io.ReadFull(conn, ipVerBuf); err != nil {
+			return nil, fmt.Errorf("couldn't read ProxyInformationResponse IP version: %w", err)
+		}
+
+		var ipSize int
+
+		if ipVerBuf[0] == 4 {
+			ipSize = IPv4Size
+		} else if ipVerBuf[0] == 6 {
+			ipSize = IPv6Size
+		} else {
+			return nil, fmt.Errorf("invalid IP version in ProxyInformationResponse: %v", ipVerBuf[0])
+		}
+
+		// Read the source IP bytes.
+		ipBytes := make([]byte, ipSize)
+
+		if _, err := io.ReadFull(conn, ipBytes); err != nil {
+			return nil, fmt.Errorf("couldn't read ProxyInformationResponse IP bytes: %w", err)
+		}
+
+		sourceIP := net.IP(ipBytes).String()
+
+		// Read SourcePort and DestPort.
+		portsBuf := make([]byte, 2+2)
+
+		if _, err := io.ReadFull(conn, portsBuf); err != nil {
+			return nil, fmt.Errorf("couldn't read ProxyInformationResponse ports: %w", err)
+		}
+
+		sourcePort := binary.BigEndian.Uint16(portsBuf[0:2])
+		destPort := binary.BigEndian.Uint16(portsBuf[2:4])
+
+		// Read protocol.
+		protoBuf := make([]byte, 1)
+
+		if _, err := io.ReadFull(conn, protoBuf); err != nil {
+			return nil, fmt.Errorf("couldn't read ProxyInformationResponse protocol: %w", err)
+		}
+
+		var protocol string
+
+		if protoBuf[0] == TCP {
+			protocol = "tcp"
+		} else if protoBuf[0] == UDP {
+			protocol = "udp"
+		} else {
+			return nil, fmt.Errorf("invalid protocol value in ProxyInformationResponse: %d", protoBuf[0])
+		}
+
+		return &ProxyInformationResponse{
+			Exists:     exists,
+			SourceIP:   sourceIP,
+			SourcePort: sourcePort,
+			DestPort:   destPort,
+			Protocol:   protocol,
+		}, nil
+
+	// ProxyConnectionInformationRequest: 1 byte ID + 2 bytes ProxyID + 2 bytes ConnectionID.
+	case ProxyConnectionInformationRequestID:
+		buf := make([]byte, 2+2)
+
+		if _, err := io.ReadFull(conn, buf); err != nil {
+			return nil, fmt.Errorf("couldn't read ProxyConnectionInformationRequest fields: %w", err)
+		}
+
+		proxyID := binary.BigEndian.Uint16(buf[0:2])
+		connectionID := binary.BigEndian.Uint16(buf[2:4])
+
+		return &ProxyConnectionInformationRequest{
+			ProxyID:      proxyID,
+			ConnectionID: connectionID,
+		}, nil
+
+	// ProxyConnectionInformationResponse:
+	// Format: 1 byte ID + 1 byte Exists + 1 byte IP version + IP bytes + 2 bytes ClientPort.
+	case ProxyConnectionInformationResponseID:
+		// Read Exists flag.
+		boolBuf := make([]byte, 1)
+		if _, err := io.ReadFull(conn, boolBuf); err != nil {
+			return nil, fmt.Errorf("couldn't read ProxyConnectionInformationResponse Exists flag: %w", err)
+		}
+
+		exists := boolBuf[0] != 0
+
+		if !exists {
+			return &ProxyConnectionInformationResponse{
+				Exists: exists,
+			}, nil
+		}
+
+		// Read IP version.
+		ipVerBuf := make([]byte, 1)
+
+		if _, err := io.ReadFull(conn, ipVerBuf); err != nil {
+			return nil, fmt.Errorf("couldn't read ProxyConnectionInformationResponse IP version: %w", err)
+		}
+
+		if ipVerBuf[0] != 4 && ipVerBuf[0] != 6 {
+			return nil, fmt.Errorf("invalid IP version in ProxyConnectionInformationResponse: %v", ipVerBuf[0])
+		}
+
+		var ipSize int
+
+		if ipVerBuf[0] == 4 {
+			ipSize = IPv4Size
+		} else {
+			ipSize = IPv6Size
+		}
+
+		// Read IP bytes.
+		ipBytes := make([]byte, ipSize)
+
+		if _, err := io.ReadFull(conn, ipBytes); err != nil {
+			return nil, fmt.Errorf("couldn't read ProxyConnectionInformationResponse IP bytes: %w", err)
+		}
+
+		clientIP := net.IP(ipBytes).String()
+
+		// Read ClientPort.
+		portBuf := make([]byte, 2)
+
+		if _, err := io.ReadFull(conn, portBuf); err != nil {
+			return nil, fmt.Errorf("couldn't read ProxyConnectionInformationResponse ClientPort: %w", err)
+		}
+
+		clientPort := binary.BigEndian.Uint16(portBuf)
+
+		return &ProxyConnectionInformationResponse{
+			Exists:     exists,
+			ClientIP:   clientIP,
+			ClientPort: clientPort,
+		}, nil
+	default:
+		return nil, fmt.Errorf("unknown command id: %v", cmdID)
+	}
+}

backend/sshappbackend/gaslighter/gaslighter.go

@@ -0,0 +1,30 @@
+package gaslighter
+
+import "io"
+
+type Gaslighter struct {
+	Byte          byte
+	HasGaslit     bool
+	ProxiedReader io.Reader
+}
+
+func (gaslighter *Gaslighter) Read(p []byte) (n int, err error) {
+	if gaslighter.HasGaslit {
+		return gaslighter.ProxiedReader.Read(p)
+	}
+
+	if len(p) == 0 {
+		return 0, nil
+	}
+
+	p[0] = gaslighter.Byte
+	gaslighter.HasGaslit = true
+
+	if len(p) > 1 {
+		n, err := gaslighter.ProxiedReader.Read(p[1:])
+
+		return n + 1, err
+	} else {
+		return 1, nil
+	}
+}

backend/sshappbackend/local-code/fs.go

@@ -0,0 +1,8 @@
+package main
+
+import (
+	"embed"
+)
+
+//go:embed remote-bin
+var binFiles embed.FS

backend/sshappbackend/local-code/logger.go

@@ -0,0 +1,23 @@
+package main
+
+import (
+	"strings"
+
+	"github.com/charmbracelet/log"
+)
+
+type WriteLogger struct{}
+
+func (writer WriteLogger) Write(p []byte) (n int, err error) {
+	logSplit := strings.Split(string(p), "\n")
+
+	for _, line := range logSplit {
+		if line == "" {
+			continue
+		}
+
+		log.Infof("Process: %s", line)
+	}
+
+	return len(p), err
+}

backend/sshappbackend/local-code/main.go

@@ -0,0 +1,868 @@
+package main
+
+import (
+	"bytes"
+	"crypto/md5"
+	"encoding/hex"
+	"encoding/json"
+	"errors"
+	"fmt"
+	"io"
+	"math/rand/v2"
+	"net"
+	"os"
+	"strings"
+	"sync"
+	"time"
+
+	"git.terah.dev/imterah/hermes/backend/backendutil"
+	"git.terah.dev/imterah/hermes/backend/commonbackend"
+	"git.terah.dev/imterah/hermes/backend/sshappbackend/datacommands"
+	"git.terah.dev/imterah/hermes/backend/sshappbackend/gaslighter"
+	"git.terah.dev/imterah/hermes/backend/sshappbackend/local-code/porttranslation"
+	"github.com/charmbracelet/log"
+	"github.com/go-playground/validator/v10"
+	"github.com/pkg/sftp"
+	"golang.org/x/crypto/ssh"
+)
+
+var validatorInstance *validator.Validate
+
+type TCPProxy struct {
+	proxyInformation *commonbackend.AddProxy
+	connections      map[uint16]net.Conn
+}
+
+type UDPProxy struct {
+	proxyInformation *commonbackend.AddProxy
+	portTranslation  *porttranslation.PortTranslation
+}
+
+type SSHAppBackendData struct {
+	IP          string   `json:"ip" validate:"required"`
+	Port        uint16   `json:"port" validate:"required"`
+	Username    string   `json:"username" validate:"required"`
+	PrivateKey  string   `json:"privateKey" validate:"required"`
+	ListenOnIPs []string `json:"listenOnIPs"`
+}
+
+type SSHAppBackend struct {
+	config      *SSHAppBackendData
+	conn        *ssh.Client
+	listener    net.Listener
+	currentSock net.Conn
+
+	tcpProxies map[uint16]*TCPProxy
+	udpProxies map[uint16]*UDPProxy
+
+	// globalNonCriticalMessageLock: Locks all messages that don't need low-latency transmissions & high
+	// speed behind a lock. This ensures safety when it comes to handling messages correctly.
+	globalNonCriticalMessageLock sync.Mutex
+	// globalNonCriticalMessageChan: Channel for handling messages that need a reply / aren't critical.
+	globalNonCriticalMessageChan chan interface{}
+}
+
+func (backend *SSHAppBackend) StartBackend(configBytes []byte) (bool, error) {
+	log.Info("SSHAppBackend is initializing...")
+
+	if validatorInstance == nil {
+		validatorInstance = validator.New()
+	}
+
+	backend.globalNonCriticalMessageChan = make(chan interface{})
+	backend.tcpProxies = map[uint16]*TCPProxy{}
+	backend.udpProxies = map[uint16]*UDPProxy{}
+
+	var backendData SSHAppBackendData
+
+	if err := json.Unmarshal(configBytes, &backendData); err != nil {
+		return false, err
+	}
+
+	if err := validatorInstance.Struct(&backendData); err != nil {
+		return false, err
+	}
+
+	backend.config = &backendData
+
+	if len(backend.config.ListenOnIPs) == 0 {
+		backend.config.ListenOnIPs = []string{"0.0.0.0"}
+	}
+
+	signer, err := ssh.ParsePrivateKey([]byte(backendData.PrivateKey))
+
+	if err != nil {
+		log.Warnf("Failed to initialize: %s", err.Error())
+		return false, err
+	}
+
+	auth := ssh.PublicKeys(signer)
+
+	config := &ssh.ClientConfig{
+		HostKeyCallback: ssh.InsecureIgnoreHostKey(),
+		User:            backendData.Username,
+		Auth: []ssh.AuthMethod{
+			auth,
+		},
+	}
+
+	conn, err := ssh.Dial("tcp", fmt.Sprintf("%s:%d", backendData.IP, backendData.Port), config)
+
+	if err != nil {
+		log.Warnf("Failed to initialize: %s", err.Error())
+		return false, err
+	}
+
+	backend.conn = conn
+
+	log.Debug("SSHAppBackend has connected successfully.")
+	log.Debug("Getting CPU architecture...")
+
+	session, err := backend.conn.NewSession()
+
+	if err != nil {
+		log.Warnf("Failed to create session: %s", err.Error())
+		conn.Close()
+		backend.conn = nil
+		return false, err
+	}
+
+	var stdoutBuf bytes.Buffer
+	session.Stdout = &stdoutBuf
+
+	err = session.Run("uname -m")
+
+	if err != nil {
+		log.Warnf("Failed to run uname command: %s", err.Error())
+		conn.Close()
+		backend.conn = nil
+		return false, err
+	}
+
+	cpuArchBytes := make([]byte, stdoutBuf.Len())
+	stdoutBuf.Read(cpuArchBytes)
+
+	cpuArch := string(cpuArchBytes)
+	cpuArch = cpuArch[:len(cpuArch)-1]
+
+	var backendBinary string
+
+	// Ordered in (subjective) popularity
+	if cpuArch == "x86_64" {
+		backendBinary = "remote-bin/rt-amd64"
+	} else if cpuArch == "aarch64" {
+		backendBinary = "remote-bin/rt-arm64"
+	} else if cpuArch == "arm" {
+		backendBinary = "remote-bin/rt-arm"
+	} else if len(cpuArch) == 4 && string(cpuArch[0]) == "i" && strings.HasSuffix(cpuArch, "86") {
+		backendBinary = "remote-bin/rt-386"
+	} else {
+		log.Warn("Failed to determine executable to use: CPU architecture not compiled/supported currently")
+		conn.Close()
+		backend.conn = nil
+		return false, fmt.Errorf("CPU architecture not compiled/supported currently")
+	}
+
+	log.Debug("Checking if we need to copy the application...")
+
+	var binary []byte
+	needsToCopyBinary := true
+
+	session, err = backend.conn.NewSession()
+
+	if err != nil {
+		log.Warnf("Failed to create session: %s", err.Error())
+		conn.Close()
+		backend.conn = nil
+		return false, err
+	}
+
+	session.Stdout = &stdoutBuf
+
+	err = session.Start("[ -f /tmp/sshappbackend.runtime ] && md5sum /tmp/sshappbackend.runtime | cut -d \" \" -f 1")
+
+	if err != nil {
+		log.Warnf("Failed to calculate hash of possibly existing backend: %s", err.Error())
+		conn.Close()
+		backend.conn = nil
+		return false, err
+	}
+
+	fileExists := stdoutBuf.Len() != 0
+
+	if fileExists {
+		remoteMD5HashStringBuf := make([]byte, stdoutBuf.Len())
+		stdoutBuf.Read(remoteMD5HashStringBuf)
+
+		remoteMD5HashString := string(remoteMD5HashStringBuf)
+		remoteMD5HashString = remoteMD5HashString[:len(remoteMD5HashString)-1]
+
+		remoteMD5Hash, err := hex.DecodeString(remoteMD5HashString)
+
+		if err != nil {
+			log.Warnf("Failed to decode hex: %s", err.Error())
+			conn.Close()
+			backend.conn = nil
+			return false, err
+		}
+
+		binary, err = binFiles.ReadFile(backendBinary)
+
+		if err != nil {
+			log.Warnf("Failed to read file in the embedded FS: %s", err.Error())
+			conn.Close()
+			backend.conn = nil
+			return false, fmt.Errorf("(embedded FS): %s", err.Error())
+		}
+
+		localMD5Hash := md5.Sum(binary)
+
+		log.Infof("remote: %s, local: %s", remoteMD5HashString, hex.EncodeToString(localMD5Hash[:]))
+
+		if bytes.Compare(localMD5Hash[:], remoteMD5Hash) == 0 {
+			needsToCopyBinary = false
+		}
+	}
+
+	if needsToCopyBinary {
+		log.Debug("Copying binary...")
+
+		sftpInstance, err := sftp.NewClient(conn)
+
+		if err != nil {
+			log.Warnf("Failed to initialize SFTP: %s", err.Error())
+			conn.Close()
+			backend.conn = nil
+			return false, err
+		}
+
+		defer sftpInstance.Close()
+
+		if len(binary) == 0 {
+			binary, err = binFiles.ReadFile(backendBinary)
+
+			if err != nil {
+				log.Warnf("Failed to read file in the embedded FS: %s", err.Error())
+				conn.Close()
+				backend.conn = nil
+				return false, fmt.Errorf("(embedded FS): %s", err.Error())
+			}
+		}
+
+		var file *sftp.File
+
+		if fileExists {
+			file, err = sftpInstance.OpenFile("/tmp/sshappbackend.runtime", os.O_WRONLY)
+		} else {
+			file, err = sftpInstance.Create("/tmp/sshappbackend.runtime")
+		}
+
+		if err != nil {
+			log.Warnf("Failed to create (or open) file: %s", err.Error())
+			conn.Close()
+			backend.conn = nil
+			return false, err
+		}
+
+		_, err = file.Write(binary)
+
+		if err != nil {
+			log.Warnf("Failed to write file: %s", err.Error())
+			conn.Close()
+			backend.conn = nil
+			return false, err
+		}
+
+		err = file.Chmod(0755)
+
+		if err != nil {
+			log.Warnf("Failed to change permissions on file: %s", err.Error())
+			conn.Close()
+			backend.conn = nil
+			return false, err
+		}
+
+		log.Debug("Done copying file.")
+		sftpInstance.Close()
+	} else {
+		log.Debug("Skipping copying as there's a copy on disk already.")
+	}
+
+	log.Debug("Initializing Unix socket...")
+
+	socketPath := fmt.Sprintf("/tmp/sock-%d.sock", rand.Uint())
+	listener, err := conn.ListenUnix(socketPath)
+
+	if err != nil {
+		log.Warnf("Failed to listen on socket: %s", err.Error())
+		conn.Close()
+		backend.conn = nil
+		return false, err
+	}
+
+	log.Debug("Starting process...")
+
+	session, err = backend.conn.NewSession()
+
+	if err != nil {
+		log.Warnf("Failed to create session: %s", err.Error())
+		conn.Close()
+		backend.conn = nil
+		return false, err
+	}
+
+	backend.listener = listener
+
+	session.Stdout = WriteLogger{}
+	session.Stderr = WriteLogger{}
+
+	go func() {
+		for {
+			err := session.Run(fmt.Sprintf("HERMES_LOG_LEVEL=\"%s\" HERMES_API_SOCK=\"%s\" /tmp/sshappbackend.runtime", os.Getenv("HERMES_LOG_LEVEL"), socketPath))
+
+			if err != nil && !errors.Is(err, &ssh.ExitError{}) && !errors.Is(err, &ssh.ExitMissingError{}) {
+				log.Errorf("Critically failed during execution of remote code: %s", err.Error())
+				return
+			} else {
+				log.Warn("Remote code failed for an unknown reason. Restarting...")
+			}
+		}
+	}()
+
+	go backend.sockServerHandler()
+
+	log.Debug("Started process. Waiting for Unix socket connection...")
+
+	for backend.currentSock == nil {
+		time.Sleep(10 * time.Millisecond)
+	}
+
+	log.Debug("Detected connection. Sending initialization command...")
+
+	proxyStatusRaw, err := backend.SendNonCriticalMessage(&commonbackend.Start{
+		Arguments: []byte{},
+	})
+
+	if err != nil {
+		return false, err
+	}
+
+	proxyStatus, ok := proxyStatusRaw.(*commonbackend.BackendStatusResponse)
+
+	if !ok {
+		return false, fmt.Errorf("recieved invalid response type: %T", proxyStatusRaw)
+	}
+
+	if proxyStatus.StatusCode == commonbackend.StatusFailure {
+		if proxyStatus.Message == "" {
+			return false, fmt.Errorf("failed to initialize backend in remote code")
+		} else {
+			return false, fmt.Errorf("failed to initialize backend in remote code: %s", proxyStatus.Message)
+		}
+	}
+
+	log.Info("SSHAppBackend has initialized successfully.")
+
+	return true, nil
+}
+
+func (backend *SSHAppBackend) StopBackend() (bool, error) {
+	err := backend.conn.Close()
+
+	if err != nil {
+		return false, err
+	}
+
+	return true, nil
+}
+
+func (backend *SSHAppBackend) GetBackendStatus() (bool, error) {
+	return backend.conn != nil, nil
+}
+
+func (backend *SSHAppBackend) StartProxy(command *commonbackend.AddProxy) (bool, error) {
+	proxyStatusRaw, err := backend.SendNonCriticalMessage(command)
+
+	if err != nil {
+		return false, err
+	}
+
+	proxyStatus, ok := proxyStatusRaw.(*datacommands.ProxyStatusResponse)
+
+	if !ok {
+		return false, fmt.Errorf("recieved invalid response type: %T", proxyStatusRaw)
+	}
+
+	if !proxyStatus.IsActive {
+		return false, fmt.Errorf("failed to initialize proxy in remote code")
+	}
+
+	if command.Protocol == "tcp" {
+		backend.tcpProxies[proxyStatus.ProxyID] = &TCPProxy{
+			proxyInformation: command,
+		}
+
+		backend.tcpProxies[proxyStatus.ProxyID].connections = map[uint16]net.Conn{}
+	} else if command.Protocol == "udp" {
+		backend.udpProxies[proxyStatus.ProxyID] = &UDPProxy{
+			proxyInformation: command,
+			portTranslation:  &porttranslation.PortTranslation{},
+		}
+
+		backend.udpProxies[proxyStatus.ProxyID].portTranslation.UDPAddr = &net.UDPAddr{
+			IP:   net.ParseIP(command.SourceIP),
+			Port: int(command.SourcePort),
+		}
+
+		udpMessageCommand := &datacommands.UDPProxyData{}
+		udpMessageCommand.ProxyID = proxyStatus.ProxyID
+
+		backend.udpProxies[proxyStatus.ProxyID].portTranslation.WriteFrom = func(ip string, port uint16, data []byte) {
+			udpMessageCommand.ClientIP = ip
+			udpMessageCommand.ClientPort = port
+			udpMessageCommand.DataLength = uint16(len(data))
+
+			marshalledCommand, err := datacommands.Marshal(udpMessageCommand)
+
+			if err != nil {
+				log.Warnf("Failed to marshal UDP message header")
+				return
+			}
+
+			if _, err := backend.currentSock.Write(marshalledCommand); err != nil {
+				log.Warnf("Failed to write UDP message header")
+				return
+			}
+
+			if _, err := backend.currentSock.Write(data); err != nil {
+				log.Warnf("Failed to write UDP message")
+				return
+			}
+		}
+
+		go func() {
+			for {
+				time.Sleep(3 * time.Minute)
+
+				// Checks if the proxy still exists before continuing
+				_, ok := backend.udpProxies[proxyStatus.ProxyID]
+
+				if !ok {
+					return
+				}
+
+				// Then attempt to run cleanup tasks
+				log.Debug("Running UDP proxy cleanup tasks (invoking CleanupPorts() on portTranslation)")
+				backend.udpProxies[proxyStatus.ProxyID].portTranslation.CleanupPorts()
+			}
+		}()
+	}
+
+	return true, nil
+}
+
+func (backend *SSHAppBackend) StopProxy(command *commonbackend.RemoveProxy) (bool, error) {
+	if command.Protocol == "tcp" {
+		for proxyIndex, proxy := range backend.tcpProxies {
+			if proxy.proxyInformation.DestPort != command.DestPort {
+				continue
+			}
+
+			onDisconnect := &datacommands.TCPConnectionClosed{
+				ProxyID: proxyIndex,
+			}
+
+			for connectionIndex, connection := range proxy.connections {
+				connection.Close()
+				delete(proxy.connections, connectionIndex)
+
+				onDisconnect.ConnectionID = connectionIndex
+				disconnectionCommandMarshalled, err := datacommands.Marshal(onDisconnect)
+
+				if err != nil {
+					log.Errorf("failed to marshal disconnection message: %s", err.Error())
+				}
+
+				backend.currentSock.Write(disconnectionCommandMarshalled)
+			}
+
+			proxyStatusRaw, err := backend.SendNonCriticalMessage(&datacommands.RemoveProxy{
+				ProxyID: proxyIndex,
+			})
+
+			if err != nil {
+				return false, err
+			}
+
+			proxyStatus, ok := proxyStatusRaw.(*datacommands.ProxyStatusResponse)
+
+			if !ok {
+				log.Warn("Failed to stop proxy: typecast failed")
+				return true, fmt.Errorf("failed to stop proxy: typecast failed")
+			}
+
+			if proxyStatus.IsActive {
+				log.Warn("Failed to stop proxy: still running")
+				return true, fmt.Errorf("failed to stop proxy: still running")
+			}
+		}
+	} else if command.Protocol == "udp" {
+		for proxyIndex, proxy := range backend.udpProxies {
+			if proxy.proxyInformation.DestPort != command.DestPort {
+				continue
+			}
+
+			proxyStatusRaw, err := backend.SendNonCriticalMessage(&datacommands.RemoveProxy{
+				ProxyID: proxyIndex,
+			})
+
+			if err != nil {
+				return false, err
+			}
+
+			proxyStatus, ok := proxyStatusRaw.(*datacommands.ProxyStatusResponse)
+
+			if !ok {
+				log.Warn("Failed to stop proxy: typecast failed")
+				return true, fmt.Errorf("failed to stop proxy: typecast failed")
+			}
+
+			if proxyStatus.IsActive {
+				log.Warn("Failed to stop proxy: still running")
+				return true, fmt.Errorf("failed to stop proxy: still running")
+			}
+
+			proxy.portTranslation.StopAllPorts()
+			delete(backend.udpProxies, proxyIndex)
+		}
+	}
+
+	return false, fmt.Errorf("could not find the proxy")
+}
+
+func (backend *SSHAppBackend) GetAllClientConnections() []*commonbackend.ProxyClientConnection {
+	connections := []*commonbackend.ProxyClientConnection{}
+	informationRequest := &datacommands.ProxyConnectionInformationRequest{}
+
+	for proxyID, tcpProxy := range backend.tcpProxies {
+		informationRequest.ProxyID = proxyID
+
+		for connectionID := range tcpProxy.connections {
+			informationRequest.ConnectionID = connectionID
+
+			proxyStatusRaw, err := backend.SendNonCriticalMessage(informationRequest)
+
+			if err != nil {
+				log.Warnf("Failed to get connection information for Proxy ID: %d, Connection ID: %d: %s", proxyID, connectionID, err.Error())
+				return connections
+			}
+
+			connectionStatus, ok := proxyStatusRaw.(*datacommands.ProxyConnectionInformationResponse)
+
+			if !ok {
+				log.Warn("Failed to get connection response: typecast failed")
+				return connections
+			}
+
+			if !connectionStatus.Exists {
+				log.Warnf("Connection with proxy ID: %d, Connection ID: %d is reported to not exist!", proxyID, connectionID)
+				tcpProxy.connections[connectionID].Close()
+			}
+
+			connections = append(connections, &commonbackend.ProxyClientConnection{
+				SourceIP:   tcpProxy.proxyInformation.SourceIP,
+				SourcePort: tcpProxy.proxyInformation.SourcePort,
+				DestPort:   tcpProxy.proxyInformation.DestPort,
+				ClientIP:   connectionStatus.ClientIP,
+				ClientPort: connectionStatus.ClientPort,
+			})
+		}
+	}
+
+	return connections
+}
+
+// We don't have any parameter limitations, so we should be good.
+func (backend *SSHAppBackend) CheckParametersForConnections(clientParameters *commonbackend.CheckClientParameters) *commonbackend.CheckParametersResponse {
+	return &commonbackend.CheckParametersResponse{
+		IsValid: true,
+	}
+}
+
+func (backend *SSHAppBackend) CheckParametersForBackend(arguments []byte) *commonbackend.CheckParametersResponse {
+	var backendData SSHAppBackendData
+
+	if validatorInstance == nil {
+		validatorInstance = validator.New()
+	}
+
+	if err := json.Unmarshal(arguments, &backendData); err != nil {
+		return &commonbackend.CheckParametersResponse{
+			IsValid: false,
+			Message: fmt.Sprintf("could not read json: %s", err.Error()),
+		}
+	}
+
+	if err := validatorInstance.Struct(&backendData); err != nil {
+		return &commonbackend.CheckParametersResponse{
+			IsValid: false,
+			Message: fmt.Sprintf("failed validation of parameters: %s", err.Error()),
+		}
+	}
+
+	return &commonbackend.CheckParametersResponse{
+		IsValid: true,
+	}
+}
+
+func (backend *SSHAppBackend) OnTCPConnectionOpened(proxyID, connectionID uint16) {
+	conn, err := net.Dial("tcp", fmt.Sprintf("%s:%d", backend.tcpProxies[proxyID].proxyInformation.SourceIP, backend.tcpProxies[proxyID].proxyInformation.SourcePort))
+
+	if err != nil {
+		log.Warnf("failed to dial sock: %s", err.Error())
+	}
+
+	go func() {
+		dataBuf := make([]byte, 65535)
+
+		tcpData := &datacommands.TCPProxyData{
+			ProxyID:      proxyID,
+			ConnectionID: connectionID,
+		}
+
+		for {
+			len, err := conn.Read(dataBuf)
+
+			if err != nil {
+				if errors.Is(err, net.ErrClosed) {
+					return
+				} else if err.Error() != "EOF" {
+					log.Warnf("failed to read from sock: %s", err.Error())
+				}
+
+				conn.Close()
+				break
+			}
+
+			tcpData.DataLength = uint16(len)
+			marshalledMessageCommand, err := datacommands.Marshal(tcpData)
+
+			if err != nil {
+				log.Warnf("failed to marshal message data: %s", err.Error())
+
+				conn.Close()
+				break
+			}
+
+			if _, err := backend.currentSock.Write(marshalledMessageCommand); err != nil {
+				log.Warnf("failed to send marshalled message data: %s", err.Error())
+
+				conn.Close()
+				break
+			}
+
+			if _, err := backend.currentSock.Write(dataBuf[:len]); err != nil {
+				log.Warnf("failed to send raw message data: %s", err.Error())
+
+				conn.Close()
+				break
+			}
+		}
+
+		onDisconnect := &datacommands.TCPConnectionClosed{
+			ProxyID:      proxyID,
+			ConnectionID: connectionID,
+		}
+
+		disconnectionCommandMarshalled, err := datacommands.Marshal(onDisconnect)
+
+		if err != nil {
+			log.Errorf("failed to marshal disconnection message: %s", err.Error())
+		}
+
+		backend.currentSock.Write(disconnectionCommandMarshalled)
+	}()
+
+	backend.tcpProxies[proxyID].connections[connectionID] = conn
+}
+
+func (backend *SSHAppBackend) OnTCPConnectionClosed(proxyID, connectionID uint16) {
+	proxy, ok := backend.tcpProxies[proxyID]
+
+	if !ok {
+		log.Warn("Could not find TCP proxy")
+	}
+
+	connection, ok := proxy.connections[connectionID]
+
+	if !ok {
+		log.Warn("Could not find connection in TCP proxy")
+	}
+
+	connection.Close()
+	delete(proxy.connections, connectionID)
+}
+
+func (backend *SSHAppBackend) HandleTCPMessage(message *datacommands.TCPProxyData, data []byte) {
+	proxy, ok := backend.tcpProxies[message.ProxyID]
+
+	if !ok {
+		log.Warn("Could not find TCP proxy")
+	}
+
+	connection, ok := proxy.connections[message.ConnectionID]
+
+	if !ok {
+		log.Warn("Could not find connection in TCP proxy")
+	}
+
+	connection.Write(data)
+}
+
+func (backend *SSHAppBackend) HandleUDPMessage(message *datacommands.UDPProxyData, data []byte) {
+	proxy, ok := backend.udpProxies[message.ProxyID]
+
+	if !ok {
+		log.Warn("Could not find UDP proxy")
+	}
+
+	if _, err := proxy.portTranslation.WriteTo(message.ClientIP, message.ClientPort, data); err != nil {
+		log.Warnf("Failed to write to UDP: %s", err.Error())
+	}
+}
+
+func (backend *SSHAppBackend) SendNonCriticalMessage(iface interface{}) (interface{}, error) {
+	if backend.currentSock == nil {
+		return nil, fmt.Errorf("socket connection not initialized yet")
+	}
+
+	bytes, err := datacommands.Marshal(iface)
+
+	if err != nil && err.Error() == "unsupported command type" {
+		bytes, err = commonbackend.Marshal(iface)
+
+		if err != nil {
+			return nil, err
+		}
+	} else if err != nil {
+		return nil, err
+	}
+
+	backend.globalNonCriticalMessageLock.Lock()
+
+	if _, err := backend.currentSock.Write(bytes); err != nil {
+		backend.globalNonCriticalMessageLock.Unlock()
+		return nil, fmt.Errorf("failed to write message: %s", err.Error())
+	}
+
+	reply, ok := <-backend.globalNonCriticalMessageChan
+
+	if !ok {
+		backend.globalNonCriticalMessageLock.Unlock()
+		return nil, fmt.Errorf("failed to get reply back: chan not OK")
+	}
+
+	backend.globalNonCriticalMessageLock.Unlock()
+	return reply, nil
+}
+
+func (backend *SSHAppBackend) sockServerHandler() {
+	for {
+		conn, err := backend.listener.Accept()
+
+		if err != nil {
+			log.Warnf("Failed to accept remote connection: %s", err.Error())
+		}
+
+		log.Debug("Successfully connected.")
+
+		backend.currentSock = conn
+
+		commandID := make([]byte, 1)
+
+		gaslighter := &gaslighter.Gaslighter{}
+		gaslighter.ProxiedReader = conn
+
+		dataBuffer := make([]byte, 65535)
+
+		var commandRaw interface{}
+
+		for {
+			if _, err := conn.Read(commandID); err != nil {
+				log.Warnf("Failed to read command ID: %s", err.Error())
+				return
+			}
+
+			gaslighter.Byte = commandID[0]
+			gaslighter.HasGaslit = false
+
+			if gaslighter.Byte > 100 {
+				commandRaw, err = datacommands.Unmarshal(gaslighter)
+			} else {
+				commandRaw, err = commonbackend.Unmarshal(gaslighter)
+			}
+
+			if err != nil {
+				log.Warnf("Failed to parse command: %s", err.Error())
+			}
+
+			switch command := commandRaw.(type) {
+			case *datacommands.TCPConnectionOpened:
+				backend.OnTCPConnectionOpened(command.ProxyID, command.ConnectionID)
+			case *datacommands.TCPConnectionClosed:
+				backend.OnTCPConnectionClosed(command.ProxyID, command.ConnectionID)
+			case *datacommands.TCPProxyData:
+				if _, err := io.ReadFull(conn, dataBuffer[:command.DataLength]); err != nil {
+					log.Warnf("Failed to read entire data buffer: %s", err.Error())
+					break
+				}
+
+				backend.HandleTCPMessage(command, dataBuffer[:command.DataLength])
+			case *datacommands.UDPProxyData:
+				if _, err := io.ReadFull(conn, dataBuffer[:command.DataLength]); err != nil {
+					log.Warnf("Failed to read entire data buffer: %s", err.Error())
+					break
+				}
+
+				backend.HandleUDPMessage(command, dataBuffer[:command.DataLength])
+			default:
+				select {
+				case backend.globalNonCriticalMessageChan <- command:
+				default:
+				}
+			}
+		}
+	}
+}
+
+func main() {
+	logLevel := os.Getenv("HERMES_LOG_LEVEL")
+
+	if logLevel != "" {
+		switch logLevel {
+		case "debug":
+			log.SetLevel(log.DebugLevel)
+
+		case "info":
+			log.SetLevel(log.InfoLevel)
+
+		case "warn":
+			log.SetLevel(log.WarnLevel)
+
+		case "error":
+			log.SetLevel(log.ErrorLevel)
+
+		case "fatal":
+			log.SetLevel(log.FatalLevel)
+		}
+	}
+
+	backend := &SSHAppBackend{}
+
+	application := backendutil.NewHelper(backend)
+	err := application.Start()
+
+	if err != nil {
+		log.Fatalf("failed execution in application: %s", err.Error())
+	}
+}

backend/sshappbackend/local-code/porttranslation/translation.go

@@ -0,0 +1,112 @@
+package porttranslation
+
+import (
+	"fmt"
+	"net"
+	"sync"
+	"time"
+)
+
+type connectionData struct {
+	udpConn         *net.UDPConn
+	buf             []byte
+	hasBeenAliveFor time.Time
+}
+
+type PortTranslation struct {
+	UDPAddr   *net.UDPAddr
+	WriteFrom func(ip string, port uint16, data []byte)
+
+	newConnectionLock sync.Mutex
+	connections       map[string]map[uint16]*connectionData
+}
+
+func (translation *PortTranslation) CleanupPorts() {
+	if translation.connections == nil {
+		translation.connections = map[string]map[uint16]*connectionData{}
+		return
+	}
+
+	for connectionIPIndex, connectionPorts := range translation.connections {
+		anyAreAlive := false
+
+		for connectionPortIndex, connectionData := range connectionPorts {
+			if time.Now().Before(connectionData.hasBeenAliveFor.Add(3 * time.Minute)) {
+				anyAreAlive = true
+				continue
+			}
+
+			connectionData.udpConn.Close()
+			delete(connectionPorts, connectionPortIndex)
+		}
+
+		if !anyAreAlive {
+			delete(translation.connections, connectionIPIndex)
+		}
+	}
+}
+
+func (translation *PortTranslation) StopAllPorts() {
+	if translation.connections == nil {
+		return
+	}
+
+	for connectionIPIndex, connectionPorts := range translation.connections {
+		for connectionPortIndex, connectionData := range connectionPorts {
+			connectionData.udpConn.Close()
+			delete(connectionPorts, connectionPortIndex)
+		}
+
+		delete(translation.connections, connectionIPIndex)
+	}
+
+	translation.connections = nil
+}
+
+func (translation *PortTranslation) WriteTo(ip string, port uint16, data []byte) (int, error) {
+	if translation.connections == nil {
+		translation.connections = map[string]map[uint16]*connectionData{}
+	}
+
+	connectionPortData, ok := translation.connections[ip]
+
+	if !ok {
+		translation.connections[ip] = map[uint16]*connectionData{}
+		connectionPortData = translation.connections[ip]
+	}
+
+	connectionStruct, ok := connectionPortData[port]
+
+	if !ok {
+		connectionPortData[port] = &connectionData{}
+		connectionStruct = connectionPortData[port]
+
+		udpConn, err := net.DialUDP("udp", nil, translation.UDPAddr)
+
+		if err != nil {
+			return 0, fmt.Errorf("failed to initialize UDP socket: %s", err.Error())
+		}
+
+		connectionStruct.udpConn = udpConn
+		connectionStruct.buf = make([]byte, 65535)
+
+		go func() {
+			for {
+				n, err := udpConn.Read(connectionStruct.buf)
+
+				if err != nil {
+					udpConn.Close()
+					delete(connectionPortData, port)
+
+					return
+				}
+
+				connectionStruct.hasBeenAliveFor = time.Now()
+				translation.WriteFrom(ip, port, connectionStruct.buf[:n])
+			}
+		}()
+	}
+
+	connectionStruct.hasBeenAliveFor = time.Now()
+	return connectionStruct.udpConn.Write(data)
+}

backend/sshappbackend/remote-code/backendutil_custom/application.go

@@ -0,0 +1,306 @@
+package backendutil_custom
+
+import (
+	"io"
+	"net"
+	"os"
+
+	"git.terah.dev/imterah/hermes/backend/backendutil"
+	"git.terah.dev/imterah/hermes/backend/commonbackend"
+	"git.terah.dev/imterah/hermes/backend/sshappbackend/datacommands"
+	"git.terah.dev/imterah/hermes/backend/sshappbackend/gaslighter"
+	"github.com/charmbracelet/log"
+)
+
+type BackendApplicationHelper struct {
+	Backend    BackendInterface
+	SocketPath string
+
+	socket net.Conn
+}
+
+func (helper *BackendApplicationHelper) Start() error {
+	log.Debug("BackendApplicationHelper is starting")
+	err := backendutil.ConfigureProfiling()
+
+	if err != nil {
+		return err
+	}
+
+	log.Debug("Currently waiting for Unix socket connection...")
+
+	helper.socket, err = net.Dial("unix", helper.SocketPath)
+
+	if err != nil {
+		return err
+	}
+
+	helper.Backend.OnSocketConnection(helper.socket)
+
+	log.Debug("Sucessfully connected")
+
+	gaslighter := &gaslighter.Gaslighter{}
+	gaslighter.ProxiedReader = helper.socket
+
+	commandID := make([]byte, 1)
+
+	for {
+		if _, err := helper.socket.Read(commandID); err != nil {
+			return err
+		}
+
+		gaslighter.Byte = commandID[0]
+		gaslighter.HasGaslit = false
+
+		var commandRaw interface{}
+
+		if gaslighter.Byte > 100 {
+			commandRaw, err = datacommands.Unmarshal(gaslighter)
+		} else {
+			commandRaw, err = commonbackend.Unmarshal(gaslighter)
+		}
+
+		if err != nil {
+			return err
+		}
+
+		switch command := commandRaw.(type) {
+		case *datacommands.ProxyConnectionsRequest:
+			connections := helper.Backend.GetAllClientConnections(command.ProxyID)
+
+			serverParams := &datacommands.ProxyConnectionsResponse{
+				Connections: connections,
+			}
+
+			byteData, err := datacommands.Marshal(serverParams)
+
+			if err != nil {
+				return err
+			}
+
+			if _, err = helper.socket.Write(byteData); err != nil {
+				return err
+			}
+		case *datacommands.RemoveProxy:
+			ok, err := helper.Backend.StopProxy(command)
+			var hasAnyFailed bool
+
+			if !ok {
+				log.Warnf("failed to remove proxy (ID %d): RemoveProxy returned into failure state", command.ProxyID)
+				hasAnyFailed = true
+			} else if err != nil {
+				log.Warnf("failed to remove proxy (ID %d): %s", command.ProxyID, err.Error())
+				hasAnyFailed = true
+			}
+
+			response := &datacommands.ProxyStatusResponse{
+				ProxyID:  command.ProxyID,
+				IsActive: hasAnyFailed,
+			}
+
+			responseMarshalled, err := datacommands.Marshal(response)
+
+			if err != nil {
+				log.Error("failed to marshal response: %s", err.Error())
+				continue
+			}
+
+			helper.socket.Write(responseMarshalled)
+		case *datacommands.ProxyInformationRequest:
+			response := helper.Backend.ResolveProxy(command.ProxyID)
+			responseMarshalled, err := datacommands.Marshal(response)
+
+			if err != nil {
+				log.Error("failed to marshal response: %s", err.Error())
+				continue
+			}
+
+			helper.socket.Write(responseMarshalled)
+		case *datacommands.ProxyConnectionInformationRequest:
+			response := helper.Backend.ResolveConnection(command.ProxyID, command.ConnectionID)
+			responseMarshalled, err := datacommands.Marshal(response)
+
+			if err != nil {
+				log.Error("failed to marshal response: %s", err.Error())
+				continue
+			}
+
+			helper.socket.Write(responseMarshalled)
+		case *datacommands.TCPConnectionClosed:
+			helper.Backend.OnTCPConnectionClosed(command.ProxyID, command.ConnectionID)
+		case *datacommands.TCPProxyData:
+			bytes := make([]byte, command.DataLength)
+			_, err := io.ReadFull(helper.socket, bytes)
+
+			if err != nil {
+				log.Warn("failed to read TCP data")
+			}
+
+			helper.Backend.HandleTCPMessage(command, bytes)
+		case *datacommands.UDPProxyData:
+			bytes := make([]byte, command.DataLength)
+			_, err := io.ReadFull(helper.socket, bytes)
+
+			if err != nil {
+				log.Warn("failed to read TCP data")
+			}
+
+			helper.Backend.HandleUDPMessage(command, bytes)
+		case *commonbackend.Start:
+			ok, err := helper.Backend.StartBackend(command.Arguments)
+
+			var (
+				message    string
+				statusCode int
+			)
+
+			if err != nil {
+				message = err.Error()
+				statusCode = commonbackend.StatusFailure
+			} else {
+				statusCode = commonbackend.StatusSuccess
+			}
+
+			response := &commonbackend.BackendStatusResponse{
+				IsRunning:  ok,
+				StatusCode: statusCode,
+				Message:    message,
+			}
+
+			responseMarshalled, err := commonbackend.Marshal(response)
+
+			if err != nil {
+				log.Error("failed to marshal response: %s", err.Error())
+				continue
+			}
+
+			helper.socket.Write(responseMarshalled)
+		case *commonbackend.Stop:
+			ok, err := helper.Backend.StopBackend()
+
+			var (
+				message    string
+				statusCode int
+			)
+
+			if err != nil {
+				message = err.Error()
+				statusCode = commonbackend.StatusFailure
+			} else {
+				statusCode = commonbackend.StatusSuccess
+			}
+
+			response := &commonbackend.BackendStatusResponse{
+				IsRunning:  !ok,
+				StatusCode: statusCode,
+				Message:    message,
+			}
+
+			responseMarshalled, err := commonbackend.Marshal(response)
+
+			if err != nil {
+				log.Error("failed to marshal response: %s", err.Error())
+				continue
+			}
+
+			helper.socket.Write(responseMarshalled)
+		case *commonbackend.BackendStatusRequest:
+			ok, err := helper.Backend.GetBackendStatus()
+
+			var (
+				message    string
+				statusCode int
+			)
+
+			if err != nil {
+				message = err.Error()
+				statusCode = commonbackend.StatusFailure
+			} else {
+				statusCode = commonbackend.StatusSuccess
+			}
+
+			response := &commonbackend.BackendStatusResponse{
+				IsRunning:  ok,
+				StatusCode: statusCode,
+				Message:    message,
+			}
+
+			responseMarshalled, err := commonbackend.Marshal(response)
+
+			if err != nil {
+				log.Error("failed to marshal response: %s", err.Error())
+				continue
+			}
+
+			helper.socket.Write(responseMarshalled)
+		case *commonbackend.AddProxy:
+			id, ok, err := helper.Backend.StartProxy(command)
+			var hasAnyFailed bool
+
+			if !ok {
+				log.Warnf("failed to add proxy (%s:%d -> remote:%d): StartProxy returned into failure state", command.SourceIP, command.SourcePort, command.DestPort)
+				hasAnyFailed = true
+			} else if err != nil {
+				log.Warnf("failed to add proxy (%s:%d -> remote:%d): %s", command.SourceIP, command.SourcePort, command.DestPort, err.Error())
+				hasAnyFailed = true
+			}
+
+			response := &datacommands.ProxyStatusResponse{
+				ProxyID:  id,
+				IsActive: !hasAnyFailed,
+			}
+
+			responseMarshalled, err := datacommands.Marshal(response)
+
+			if err != nil {
+				log.Error("failed to marshal response: %s", err.Error())
+				continue
+			}
+
+			helper.socket.Write(responseMarshalled)
+		case *commonbackend.CheckClientParameters:
+			resp := helper.Backend.CheckParametersForConnections(command)
+			resp.InResponseTo = "checkClientParameters"
+
+			byteData, err := commonbackend.Marshal(resp)
+
+			if err != nil {
+				return err
+			}
+
+			if _, err = helper.socket.Write(byteData); err != nil {
+				return err
+			}
+		case *commonbackend.CheckServerParameters:
+			resp := helper.Backend.CheckParametersForBackend(command.Arguments)
+			resp.InResponseTo = "checkServerParameters"
+
+			byteData, err := commonbackend.Marshal(resp)
+
+			if err != nil {
+				return err
+			}
+
+			if _, err = helper.socket.Write(byteData); err != nil {
+				return err
+			}
+		default:
+			log.Warnf("Unsupported command recieved: %T", command)
+		}
+	}
+}
+
+func NewHelper(backend BackendInterface) *BackendApplicationHelper {
+	socketPath, ok := os.LookupEnv("HERMES_API_SOCK")
+
+	if !ok {
+		log.Warn("HERMES_API_SOCK is not defined! This will cause an issue unless the backend manually overwrites it")
+	}
+
+	helper := &BackendApplicationHelper{
+		Backend:    backend,
+		SocketPath: socketPath,
+	}
+
+	return helper
+}

backend/sshappbackend/remote-code/backendutil_custom/structure.go

@@ -0,0 +1,26 @@
+package backendutil_custom
+
+import (
+	"net"
+
+	"git.terah.dev/imterah/hermes/backend/commonbackend"
+	"git.terah.dev/imterah/hermes/backend/sshappbackend/datacommands"
+)
+
+type BackendInterface interface {
+	StartBackend(arguments []byte) (bool, error)
+	StopBackend() (bool, error)
+	GetBackendStatus() (bool, error)
+	StartProxy(command *commonbackend.AddProxy) (uint16, bool, error)
+	StopProxy(command *datacommands.RemoveProxy) (bool, error)
+	GetAllProxies() []uint16
+	ResolveProxy(proxyID uint16) *datacommands.ProxyInformationResponse
+	GetAllClientConnections(proxyID uint16) []uint16
+	ResolveConnection(proxyID, connectionID uint16) *datacommands.ProxyConnectionInformationResponse
+	CheckParametersForConnections(clientParameters *commonbackend.CheckClientParameters) *commonbackend.CheckParametersResponse
+	CheckParametersForBackend(arguments []byte) *commonbackend.CheckParametersResponse
+	OnTCPConnectionClosed(proxyID, connectionID uint16)
+	HandleTCPMessage(message *datacommands.TCPProxyData, data []byte)
+	HandleUDPMessage(message *datacommands.UDPProxyData, data []byte)
+	OnSocketConnection(sock net.Conn)
+}

backend/sshappbackend/remote-code/main.go

@@ -0,0 +1,460 @@
+package main
+
+import (
+	"errors"
+	"fmt"
+	"net"
+	"os"
+	"strconv"
+	"strings"
+	"sync"
+
+	"git.terah.dev/imterah/hermes/backend/commonbackend"
+	"git.terah.dev/imterah/hermes/backend/sshappbackend/datacommands"
+	"git.terah.dev/imterah/hermes/backend/sshappbackend/remote-code/backendutil_custom"
+	"github.com/charmbracelet/log"
+)
+
+type TCPProxy struct {
+	connectionIDIndex uint16
+	connectionIDLock  sync.Mutex
+
+	proxyInformation *commonbackend.AddProxy
+	connections      map[uint16]net.Conn
+	server           net.Listener
+}
+
+type UDPProxy struct {
+	server           *net.UDPConn
+	proxyInformation *commonbackend.AddProxy
+}
+
+type SSHRemoteAppBackend struct {
+	proxyIDIndex uint16
+	proxyIDLock  sync.Mutex
+
+	tcpProxies map[uint16]*TCPProxy
+	udpProxies map[uint16]*UDPProxy
+
+	isRunning bool
+
+	sock net.Conn
+}
+
+func (backend *SSHRemoteAppBackend) StartBackend(byte []byte) (bool, error) {
+	backend.tcpProxies = map[uint16]*TCPProxy{}
+	backend.udpProxies = map[uint16]*UDPProxy{}
+
+	backend.isRunning = true
+
+	return true, nil
+}
+
+func (backend *SSHRemoteAppBackend) StopBackend() (bool, error) {
+	for tcpProxyIndex, tcpProxy := range backend.tcpProxies {
+		for _, tcpConnection := range tcpProxy.connections {
+			tcpConnection.Close()
+		}
+
+		tcpProxy.server.Close()
+		delete(backend.tcpProxies, tcpProxyIndex)
+	}
+
+	for udpProxyIndex, udpProxy := range backend.udpProxies {
+		udpProxy.server.Close()
+		delete(backend.udpProxies, udpProxyIndex)
+	}
+
+	backend.isRunning = false
+	return true, nil
+}
+
+func (backend *SSHRemoteAppBackend) GetBackendStatus() (bool, error) {
+	return backend.isRunning, nil
+}
+
+func (backend *SSHRemoteAppBackend) StartProxy(command *commonbackend.AddProxy) (uint16, bool, error) {
+	// Allocate a new proxy ID
+	backend.proxyIDLock.Lock()
+	proxyID := backend.proxyIDIndex
+	backend.proxyIDIndex++
+	backend.proxyIDLock.Unlock()
+
+	if command.Protocol == "tcp" {
+		backend.tcpProxies[proxyID] = &TCPProxy{
+			connections:      map[uint16]net.Conn{},
+			proxyInformation: command,
+		}
+
+		server, err := net.Listen("tcp", fmt.Sprintf(":%d", command.DestPort))
+
+		if err != nil {
+			return 0, false, fmt.Errorf("failed to open server: %s", err.Error())
+		}
+
+		backend.tcpProxies[proxyID].server = server
+
+		go func() {
+			for {
+				conn, err := server.Accept()
+
+				if err != nil {
+					log.Warnf("failed to accept connection: %s", err.Error())
+					return
+				}
+
+				go func() {
+					backend.tcpProxies[proxyID].connectionIDLock.Lock()
+					connectionID := backend.tcpProxies[proxyID].connectionIDIndex
+					backend.tcpProxies[proxyID].connectionIDIndex++
+					backend.tcpProxies[proxyID].connectionIDLock.Unlock()
+
+					backend.tcpProxies[proxyID].connections[connectionID] = conn
+
+					dataBuf := make([]byte, 65535)
+
+					onConnection := &datacommands.TCPConnectionOpened{
+						ProxyID:      proxyID,
+						ConnectionID: connectionID,
+					}
+
+					connectionCommandMarshalled, err := datacommands.Marshal(onConnection)
+
+					if err != nil {
+						log.Errorf("failed to marshal connection message: %s", err.Error())
+					}
+
+					backend.sock.Write(connectionCommandMarshalled)
+
+					tcpData := &datacommands.TCPProxyData{
+						ProxyID:      proxyID,
+						ConnectionID: connectionID,
+					}
+
+					for {
+						len, err := conn.Read(dataBuf)
+
+						if err != nil {
+							if errors.Is(err, net.ErrClosed) {
+								return
+							} else if err.Error() != "EOF" {
+								log.Warnf("failed to read from sock: %s", err.Error())
+							}
+
+							conn.Close()
+							break
+						}
+
+						tcpData.DataLength = uint16(len)
+						marshalledMessageCommand, err := datacommands.Marshal(tcpData)
+
+						if err != nil {
+							log.Warnf("failed to marshal message data: %s", err.Error())
+
+							conn.Close()
+							break
+						}
+
+						if _, err := backend.sock.Write(marshalledMessageCommand); err != nil {
+							log.Warnf("failed to send marshalled message data: %s", err.Error())
+
+							conn.Close()
+							break
+						}
+
+						if _, err := backend.sock.Write(dataBuf[:len]); err != nil {
+							log.Warnf("failed to send raw message data: %s", err.Error())
+
+							conn.Close()
+							break
+						}
+					}
+
+					onDisconnect := &datacommands.TCPConnectionClosed{
+						ProxyID:      proxyID,
+						ConnectionID: connectionID,
+					}
+
+					disconnectionCommandMarshalled, err := datacommands.Marshal(onDisconnect)
+
+					if err != nil {
+						log.Errorf("failed to marshal disconnection message: %s", err.Error())
+					}
+
+					backend.sock.Write(disconnectionCommandMarshalled)
+				}()
+			}
+		}()
+	} else if command.Protocol == "udp" {
+		backend.udpProxies[proxyID] = &UDPProxy{
+			proxyInformation: command,
+		}
+
+		server, err := net.ListenUDP("udp", &net.UDPAddr{
+			IP:   net.IPv4(0, 0, 0, 0),
+			Port: int(command.DestPort),
+		})
+
+		if err != nil {
+			return 0, false, fmt.Errorf("failed to open server: %s", err.Error())
+		}
+
+		backend.udpProxies[proxyID].server = server
+		dataBuf := make([]byte, 65535)
+
+		udpProxyData := &datacommands.UDPProxyData{
+			ProxyID: proxyID,
+		}
+
+		go func() {
+			for {
+				len, addr, err := server.ReadFromUDP(dataBuf)
+
+				if err != nil {
+					log.Warnf("failed to read from UDP socket: %s", err.Error())
+					continue
+				}
+
+				udpProxyData.ClientIP = addr.IP.String()
+				udpProxyData.ClientPort = uint16(addr.Port)
+				udpProxyData.DataLength = uint16(len)
+
+				marshalledMessageCommand, err := datacommands.Marshal(udpProxyData)
+
+				if err != nil {
+					log.Warnf("failed to marshal message data: %s", err.Error())
+					continue
+				}
+
+				if _, err := backend.sock.Write(marshalledMessageCommand); err != nil {
+					log.Warnf("failed to send marshalled message data: %s", err.Error())
+					continue
+				}
+
+				if _, err := backend.sock.Write(dataBuf[:len]); err != nil {
+					log.Warnf("failed to send raw message data: %s", err.Error())
+					continue
+				}
+			}
+		}()
+	}
+
+	return proxyID, true, nil
+}
+
+func (backend *SSHRemoteAppBackend) StopProxy(command *datacommands.RemoveProxy) (bool, error) {
+	tcpProxy, ok := backend.tcpProxies[command.ProxyID]
+
+	if !ok {
+		udpProxy, ok := backend.udpProxies[command.ProxyID]
+
+		if !ok {
+			return ok, fmt.Errorf("could not find proxy")
+		}
+
+		udpProxy.server.Close()
+		delete(backend.udpProxies, command.ProxyID)
+	} else {
+		for _, tcpConnection := range tcpProxy.connections {
+			tcpConnection.Close()
+		}
+
+		tcpProxy.server.Close()
+		delete(backend.tcpProxies, command.ProxyID)
+	}
+
+	return true, nil
+}
+
+func (backend *SSHRemoteAppBackend) GetAllProxies() []uint16 {
+	proxyList := make([]uint16, len(backend.tcpProxies)+len(backend.udpProxies))
+
+	currentPos := 0
+
+	for tcpProxy := range backend.tcpProxies {
+		proxyList[currentPos] = tcpProxy
+		currentPos += 1
+	}
+
+	for udpProxy := range backend.udpProxies {
+		proxyList[currentPos] = udpProxy
+		currentPos += 1
+	}
+
+	return proxyList
+}
+
+func (backend *SSHRemoteAppBackend) ResolveProxy(proxyID uint16) *datacommands.ProxyInformationResponse {
+	var proxyInformation *commonbackend.AddProxy
+	response := &datacommands.ProxyInformationResponse{}
+
+	tcpProxy, ok := backend.tcpProxies[proxyID]
+
+	if !ok {
+		udpProxy, ok := backend.udpProxies[proxyID]
+
+		if !ok {
+			response.Exists = false
+			return response
+		}
+
+		proxyInformation = udpProxy.proxyInformation
+	} else {
+		proxyInformation = tcpProxy.proxyInformation
+	}
+
+	response.Exists = true
+	response.SourceIP = proxyInformation.SourceIP
+	response.SourcePort = proxyInformation.SourcePort
+	response.DestPort = proxyInformation.DestPort
+	response.Protocol = proxyInformation.Protocol
+
+	return response
+}
+
+func (backend *SSHRemoteAppBackend) GetAllClientConnections(proxyID uint16) []uint16 {
+	tcpProxy, ok := backend.tcpProxies[proxyID]
+
+	if !ok {
+		return []uint16{}
+	}
+
+	connectionsArray := make([]uint16, len(tcpProxy.connections))
+	currentPos := 0
+
+	for connectionIndex := range tcpProxy.connections {
+		connectionsArray[currentPos] = connectionIndex
+		currentPos++
+	}
+
+	return connectionsArray
+}
+
+func (backend *SSHRemoteAppBackend) ResolveConnection(proxyID, connectionID uint16) *datacommands.ProxyConnectionInformationResponse {
+	response := &datacommands.ProxyConnectionInformationResponse{}
+	tcpProxy, ok := backend.tcpProxies[proxyID]
+
+	if !ok {
+		response.Exists = false
+		return response
+	}
+
+	connection, ok := tcpProxy.connections[connectionID]
+
+	if !ok {
+		response.Exists = false
+		return response
+	}
+
+	addr := connection.RemoteAddr().String()
+	ip := addr[:strings.LastIndex(addr, ":")]
+	port, err := strconv.Atoi(addr[strings.LastIndex(addr, ":")+1:])
+
+	if err != nil {
+		log.Warnf("failed to parse client port: %s", err.Error())
+		response.Exists = false
+
+		return response
+	}
+
+	response.ClientIP = ip
+	response.ClientPort = uint16(port)
+
+	return response
+}
+
+func (backend *SSHRemoteAppBackend) CheckParametersForConnections(clientParameters *commonbackend.CheckClientParameters) *commonbackend.CheckParametersResponse {
+	return &commonbackend.CheckParametersResponse{
+		IsValid: true,
+	}
+}
+
+func (backend *SSHRemoteAppBackend) CheckParametersForBackend(arguments []byte) *commonbackend.CheckParametersResponse {
+	return &commonbackend.CheckParametersResponse{
+		IsValid: true,
+	}
+}
+
+func (backend *SSHRemoteAppBackend) HandleTCPMessage(message *datacommands.TCPProxyData, data []byte) {
+	tcpProxy, ok := backend.tcpProxies[message.ProxyID]
+
+	if !ok {
+		log.Warnf("could not find tcp proxy (ID %d)", message.ProxyID)
+		return
+	}
+
+	connection, ok := tcpProxy.connections[message.ConnectionID]
+
+	if !ok {
+		log.Warnf("could not find tcp proxy (ID %d) with connection ID (%d)", message.ProxyID, message.ConnectionID)
+		return
+	}
+
+	connection.Write(data)
+}
+
+func (backend *SSHRemoteAppBackend) HandleUDPMessage(message *datacommands.UDPProxyData, data []byte) {
+	udpProxy, ok := backend.udpProxies[message.ProxyID]
+
+	if !ok {
+		return
+	}
+
+	udpProxy.server.WriteToUDP(data, &net.UDPAddr{
+		IP:   net.ParseIP(message.ClientIP),
+		Port: int(message.ClientPort),
+	})
+}
+
+func (backend *SSHRemoteAppBackend) OnTCPConnectionClosed(proxyID, connectionID uint16) {
+	tcpProxy, ok := backend.tcpProxies[proxyID]
+
+	if !ok {
+		return
+	}
+
+	connection, ok := tcpProxy.connections[connectionID]
+
+	if !ok {
+		return
+	}
+
+	connection.Close()
+	delete(tcpProxy.connections, connectionID)
+}
+
+func (backend *SSHRemoteAppBackend) OnSocketConnection(sock net.Conn) {
+	backend.sock = sock
+}
+
+func main() {
+	logLevel := os.Getenv("HERMES_LOG_LEVEL")
+
+	if logLevel != "" {
+		switch logLevel {
+		case "debug":
+			log.SetLevel(log.DebugLevel)
+
+		case "info":
+			log.SetLevel(log.InfoLevel)
+
+		case "warn":
+			log.SetLevel(log.WarnLevel)
+
+		case "error":
+			log.SetLevel(log.ErrorLevel)
+
+		case "fatal":
+			log.SetLevel(log.FatalLevel)
+		}
+	}
+
+	backend := &SSHRemoteAppBackend{}
+
+	application := backendutil_custom.NewHelper(backend)
+	err := application.Start()
+
+	if err != nil {
+		log.Fatalf("failed execution in application: %s", err.Error())
+	}
+}

backend/sshbackend/main.go

@@ -6,6 +6,7 @@ import (
 	"fmt"
 	"net"
 	"os"
+	"slices"
 	"strconv"
 	"strings"
 	"sync"
@@ -18,6 +19,34 @@ import (
 	"golang.org/x/crypto/ssh"
 )
 
+var validatorInstance *validator.Validate
+
+type ConnWithTimeout struct {
+	net.Conn
+	ReadTimeout  time.Duration
+	WriteTimeout time.Duration
+}
+
+func (c *ConnWithTimeout) Read(b []byte) (int, error) {
+	err := c.Conn.SetReadDeadline(time.Now().Add(c.ReadTimeout))
+
+	if err != nil {
+		return 0, err
+	}
+
+	return c.Conn.Read(b)
+}
+
+func (c *ConnWithTimeout) Write(b []byte) (int, error) {
+	err := c.Conn.SetWriteDeadline(time.Now().Add(c.WriteTimeout))
+
+	if err != nil {
+		return 0, err
+	}
+
+	return c.Conn.Write(b)
+}
+
 type SSHListener struct {
 	SourceIP   string
 	SourcePort uint16
@@ -26,31 +55,46 @@ type SSHListener struct {
 	Listeners  []net.Listener
 }
 
+type SSHBackendData struct {
+	IP              string   `json:"ip" validate:"required"`
+	Port            uint16   `json:"port" validate:"required"`
+	Username        string   `json:"username" validate:"required"`
+	PrivateKey      string   `json:"privateKey" validate:"required"`
+	DisablePIDCheck bool     `json:"disablePIDCheck"`
+	ListenOnIPs     []string `json:"listenOnIPs"`
+}
+
 type SSHBackend struct {
 	config         *SSHBackendData
 	conn           *ssh.Client
 	clients        []*commonbackend.ProxyClientConnection
 	proxies        []*SSHListener
 	arrayPropMutex sync.Mutex
-}
-
-type SSHBackendData struct {
-	IP          string   `json:"ip" validate:"required"`
-	Port        uint16   `json:"port" validate:"required"`
-	Username    string   `json:"username" validate:"required"`
-	PrivateKey  string   `json:"privateKey" validate:"required"`
-	ListenOnIPs []string `json:"listenOnIPs"`
+	pid            int
+	isReady        bool
+	inReinitLoop   bool
 }
 
 func (backend *SSHBackend) StartBackend(bytes []byte) (bool, error) {
 	log.Info("SSHBackend is initializing...")
+
+	if validatorInstance == nil {
+		validatorInstance = validator.New()
+	}
+
+	if backend.inReinitLoop {
+		for !backend.isReady {
+			time.Sleep(100 * time.Millisecond)
+		}
+	}
+
 	var backendData SSHBackendData
 
 	if err := json.Unmarshal(bytes, &backendData); err != nil {
 		return false, err
 	}
 
-	if err := validator.New().Struct(&backendData); err != nil {
+	if err := validatorInstance.Struct(&backendData); err != nil {
 		return false, err
 	}
 
@@ -76,16 +120,70 @@ func (backend *SSHBackend) StartBackend(bytes []byte) (bool, error) {
 		},
 	}
 
-	conn, err := ssh.Dial("tcp", fmt.Sprintf("%s:%d", backendData.IP, backendData.Port), config)
+	addr := fmt.Sprintf("%s:%d", backendData.IP, backendData.Port)
+	timeout := time.Duration(10 * time.Second)
+
+	rawTCPConn, err := net.DialTimeout("tcp", addr, timeout)
 
 	if err != nil {
 		return false, err
 	}
 
-	backend.conn = conn
+	connWithTimeout := &ConnWithTimeout{
+		Conn:         rawTCPConn,
+		ReadTimeout:  timeout,
+		WriteTimeout: timeout,
+	}
+
+	c, chans, reqs, err := ssh.NewClientConn(connWithTimeout, addr, config)
+
+	if err != nil {
+		return false, err
+	}
+
+	client := ssh.NewClient(c, chans, reqs)
+	backend.conn = client
+
+	if !backendData.DisablePIDCheck {
+		if backend.pid != 0 {
+			session, err := client.NewSession()
+
+			if err != nil {
+				return false, err
+			}
+
+			err = session.Run(fmt.Sprintf("kill -9 %d", backend.pid))
+
+			if err != nil {
+				log.Warnf("Failed to kill process: %s", err.Error())
+			}
+		}
+
+		session, err := client.NewSession()
+
+		if err != nil {
+			return false, err
+		}
+
+		// Get the parent PID of the shell so we can kill it if we disconnect
+		output, err := session.Output("ps --no-headers -fp $$ | awk '{print $3}'")
+
+		if err != nil {
+			return false, err
+		}
+
+		// Strip the new line and convert to int
+		backend.pid, err = strconv.Atoi(string(output)[:len(output)-1])
+
+		if err != nil {
+			return false, err
+		}
+	}
+
+	go backend.backendDisconnectHandler()
+	go backend.backendKeepaliveHandler()
 
 	log.Info("SSHBackend has initialized successfully.")
-	go backend.backendDisconnectHandler()
 
 	return true, nil
 }
@@ -203,8 +301,7 @@ func (backend *SSHBackend) StartProxy(command *commonbackend.AddProxy) (bool, er
 							// Splice out the clientInstance by clientIndex
 
 							// TODO: change approach. It works but it's a bit wonky imho
-							// I asked AI to do this as it's a relatively simple task and I forgot how to do this effectively
-							backend.clients = append(backend.clients[:clientIndex], backend.clients[clientIndex+1:]...)
+							backend.clients = slices.Delete(backend.clients, clientIndex, clientIndex+1)
 							return
 						}
 					}
@@ -221,13 +318,19 @@ func (backend *SSHBackend) StartProxy(command *commonbackend.AddProxy) (bool, er
 					for {
 						len, err := forwardedConn.Read(forwardedBuffer)
 
-						if err != nil && err.Error() != "EOF" && !errors.Is(err, net.ErrClosed) {
+						if err != nil {
+							if err.Error() != "EOF" && !errors.Is(err, net.ErrClosed) {
 								log.Errorf("failed to read from forwarded connection: %s", err.Error())
+							}
+
 							return
 						}
 
-						if _, err = sourceConn.Write(forwardedBuffer[:len]); err != nil && err.Error() != "EOF" && !errors.Is(err, net.ErrClosed) {
+						if _, err = sourceConn.Write(forwardedBuffer[:len]); err != nil {
+							if err.Error() != "EOF" && !errors.Is(err, net.ErrClosed) {
 								log.Errorf("failed to write to source connection: %s", err.Error())
+							}
+
 							return
 						}
 					}
@@ -239,13 +342,19 @@ func (backend *SSHBackend) StartProxy(command *commonbackend.AddProxy) (bool, er
 					for {
 						len, err := sourceConn.Read(sourceBuffer)
 
-						if err != nil && err.Error() != "EOF" && !errors.Is(err, net.ErrClosed) {
+						if err != nil {
+							if err.Error() != "EOF" && !errors.Is(err, net.ErrClosed) {
 								log.Errorf("failed to read from source connection: %s", err.Error())
+							}
+
 							return
 						}
 
-						if _, err = forwardedConn.Write(sourceBuffer[:len]); err != nil && err.Error() != "EOF" && !errors.Is(err, net.ErrClosed) {
+						if _, err = forwardedConn.Write(sourceBuffer[:len]); err != nil {
+							if err.Error() != "EOF" && !errors.Is(err, net.ErrClosed) {
 								log.Errorf("failed to write to forwarded connection: %s", err.Error())
+							}
+
 							return
 						}
 					}
@@ -276,10 +385,8 @@ func (backend *SSHBackend) StopProxy(command *commonbackend.RemoveProxy) (bool,
 			}
 
 			// Splice out the proxy instance by proxyIndex
-
 			// TODO: change approach. It works but it's a bit wonky imho
-			// I asked AI to do this as it's a relatively simple task and I forgot how to do this effectively
-			backend.proxies = append(backend.proxies[:proxyIndex], backend.proxies[proxyIndex+1:]...)
+			backend.proxies = slices.Delete(backend.proxies, proxyIndex, proxyIndex+1)
 			return true, nil
 		}
 	}
@@ -310,6 +417,10 @@ func (backend *SSHBackend) CheckParametersForConnections(clientParameters *commo
 func (backend *SSHBackend) CheckParametersForBackend(arguments []byte) *commonbackend.CheckParametersResponse {
 	var backendData SSHBackendData
 
+	if validatorInstance == nil {
+		validatorInstance = validator.New()
+	}
+
 	if err := json.Unmarshal(arguments, &backendData); err != nil {
 		return &commonbackend.CheckParametersResponse{
 			IsValid: false,
@@ -317,7 +428,7 @@ func (backend *SSHBackend) CheckParametersForBackend(arguments []byte) *commonba
 		}
 	}
 
-	if err := validator.New().Struct(&backendData); err != nil {
+	if err := validatorInstance.Struct(&backendData); err != nil {
 		return &commonbackend.CheckParametersResponse{
 			IsValid: false,
 			Message: fmt.Sprintf("failed validation of parameters: %s", err.Error()),
@@ -329,17 +440,34 @@ func (backend *SSHBackend) CheckParametersForBackend(arguments []byte) *commonba
 	}
 }
 
+func (backend *SSHBackend) backendKeepaliveHandler() {
+	for {
+		if backend.conn != nil {
+			_, _, err := backend.conn.SendRequest("keepalive@openssh.com", true, nil)
+
+			if err != nil {
+				log.Warn("Keepalive message failed!")
+				return
+			}
+		}
+
+		time.Sleep(5 * time.Second)
+	}
+}
+
 func (backend *SSHBackend) backendDisconnectHandler() {
 	for {
 		if backend.conn != nil {
-			err := backend.conn.Wait()
+			backend.conn.Wait()
+			backend.conn.Close()
 
-			if err == nil || err.Error() != "EOF" {
-				continue
-			}
-		}
+			backend.isReady = false
+			backend.inReinitLoop = true
 
 			log.Info("Disconnected from the remote SSH server. Attempting to reconnect in 5 seconds...")
+		} else {
+			log.Info("Retrying reconnection in 5 seconds...")
+		}
 
 		time.Sleep(5 * time.Second)
 
@@ -364,14 +492,74 @@ func (backend *SSHBackend) backendDisconnectHandler() {
 			},
 		}
 
-		conn, err := ssh.Dial("tcp", fmt.Sprintf("%s:%d", backend.config.IP, backend.config.Port), config)
+		addr := fmt.Sprintf("%s:%d", backend.config.IP, backend.config.Port)
+		timeout := time.Duration(10 * time.Second)
+
+		rawTCPConn, err := net.DialTimeout("tcp", addr, timeout)
 
 		if err != nil {
-			log.Errorf("Failed to connect to the server: %s", err.Error())
+			log.Errorf("Failed to establish connection to the server: %s", err.Error())
+			continue
+		}
+
+		connWithTimeout := &ConnWithTimeout{
+			Conn:         rawTCPConn,
+			ReadTimeout:  timeout,
+			WriteTimeout: timeout,
+		}
+
+		c, chans, reqs, err := ssh.NewClientConn(connWithTimeout, addr, config)
+
+		if err != nil {
+			log.Errorf("Failed to create SSH client connection: %s", err.Error())
+			rawTCPConn.Close()
+			continue
+		}
+
+		client := ssh.NewClient(c, chans, reqs)
+		backend.conn = client
+
+		if !backend.config.DisablePIDCheck {
+			if backend.pid != 0 {
+				session, err := client.NewSession()
+
+				if err != nil {
+					log.Warnf("Failed to create SSH command session: %s", err.Error())
 					return
 				}
 
-		backend.conn = conn
+				err = session.Run(fmt.Sprintf("kill -9 %d", backend.pid))
+
+				if err != nil {
+					log.Warnf("Failed to kill process: %s", err.Error())
+				}
+			}
+
+			session, err := client.NewSession()
+
+			if err != nil {
+				log.Warnf("Failed to create SSH command session: %s", err.Error())
+				return
+			}
+
+			// Get the parent PID of the shell so we can kill it if we disconnect
+			output, err := session.Output("ps --no-headers -fp $$ | awk '{print $3}'")
+
+			if err != nil {
+				log.Warnf("Failed to execute command to fetch PID: %s", err.Error())
+				return
+			}
+
+			// Strip the new line and convert to int
+			backend.pid, err = strconv.Atoi(string(output)[:len(output)-1])
+
+			if err != nil {
+				log.Warnf("Failed to parse PID: %s", err.Error())
+				return
+			}
+		}
+
+		go backend.backendKeepaliveHandler()
 
 		log.Info("SSHBackend has reconnected successfully. Attempting to set up proxies again...")
 

docker-compose.yml

@@ -6,27 +6,12 @@ services:
     environment:
       DATABASE_URL: postgresql://${POSTGRES_USERNAME}:${POSTGRES_PASSWORD}@nextnet-postgres:5432/${POSTGRES_DB}?schema=nextnet
       HERMES_POSTGRES_DSN: postgres://${POSTGRES_USERNAME}:${POSTGRES_PASSWORD}@nextnet-postgres:5432/${POSTGRES_DB}
+      HERMES_JWT_SECRET: ${JWT_SECRET}
       HERMES_DATABASE_BACKEND: postgresql
     depends_on:
       - db
     ports:
       - 3000:3000
-
-  # WARN: The LOM is deprecated and likely broken currently.
-  #
-  # NOTE: For this to work correctly, the nextnet-api must be version > 0.1.1
-  # or have a version with backported username support, incl. logins
-  lom:
-    image: ghcr.io/imterah/hermes-lom:latest
-    container_name: hermes-lom
-    restart: always
-    ports:
-      - 2222:2222
-    depends_on:
-      - api
-    volumes:
-      - ssh_key_data:/app/keys
-
   db:
     image: postgres:17.2
     container_name: nextnet-postgres
@@ -37,7 +22,6 @@ services:
       POSTGRES_USER: ${POSTGRES_USERNAME}
     volumes:
       - postgres_data:/var/lib/postgresql/data
-
 volumes:
   postgres_data:
   ssh_key_data:

docs/profiling.md

@@ -0,0 +1,6 @@
+# Profiling
+To profile any backend code based on `backendutil`, follow these steps:
+1. Rebuild the backend with the `debug` flag: `cd $BACKEND_HERE; GOOS=linux go build -tags debug .; cd ..`
+2. Copy the binary to the target machine (if applicable), and stop the API server.
+3. If you want to profile the CPU utilization, write `cpu` to the file `/tmp/hermes.backendlauncher.profilebackends`: `echo -n "cpu" > /tmp/hermes.backendlauncher.profilebackends`. Else, replace `cpu` with `mem`.
+4. Start the API server, with development mode and debug logging enabled.

go.mod

@@ -7,8 +7,10 @@ require (
 	github.com/gin-gonic/gin v1.10.0
 	github.com/go-playground/validator/v10 v10.23.0
 	github.com/golang-jwt/jwt/v5 v5.2.1
+	github.com/pkg/sftp v1.13.7
 	github.com/urfave/cli/v2 v2.27.5
 	golang.org/x/crypto v0.31.0
+	golang.org/x/exp v0.0.0-20231006140011-7918f672742d
 	golang.org/x/term v0.28.0
 	gopkg.in/yaml.v3 v3.0.1
 	gorm.io/driver/postgres v1.5.11
@@ -38,6 +40,7 @@ require (
 	github.com/jinzhu/now v1.1.5 // indirect
 	github.com/json-iterator/go v1.1.12 // indirect
 	github.com/klauspost/cpuid/v2 v2.2.9 // indirect
+	github.com/kr/fs v0.1.0 // indirect
 	github.com/kr/text v0.2.0 // indirect
 	github.com/leodido/go-urn v1.4.0 // indirect
 	github.com/lucasb-eyer/go-colorful v1.2.0 // indirect
@@ -56,7 +59,6 @@ require (
 	github.com/ugorji/go/codec v1.2.12 // indirect
 	github.com/xrash/smetrics v0.0.0-20240521201337-686a1a2994c1 // indirect
 	golang.org/x/arch v0.12.0 // indirect
-	golang.org/x/exp v0.0.0-20231006140011-7918f672742d // indirect
 	golang.org/x/net v0.33.0 // indirect
 	golang.org/x/sync v0.10.0 // indirect
 	golang.org/x/sys v0.29.0 // indirect

go.sum

@@ -60,6 +60,8 @@ github.com/klauspost/cpuid/v2 v2.0.9/go.mod h1:FInQzS24/EEf25PyTYn52gqo7WaD8xa02
 github.com/klauspost/cpuid/v2 v2.2.9 h1:66ze0taIn2H33fBvCkXuv9BmCwDfafmiIVpKV9kKGuY=
 github.com/klauspost/cpuid/v2 v2.2.9/go.mod h1:rqkxqrZ1EhYM9G+hXH7YdowN5R5RGN6NK4QwQ3WMXF8=
 github.com/knz/go-libedit v1.10.1/go.mod h1:MZTVkCWyz0oBc7JOWP3wNAzd002ZbM/5hgShxwh4x8M=
+github.com/kr/fs v0.1.0 h1:Jskdu9ieNAYnjxsi0LbQp1ulIKZV1LAFgK1tWhpZgl8=
+github.com/kr/fs v0.1.0/go.mod h1:FFnZGqtBN9Gxj7eW1uZ42v5BccTP0vu6NEaFoC2HwRg=
 github.com/kr/pretty v0.3.0 h1:WgNl7dwNpEZ6jJ9k1snq4pZsg7DOEN8hP9Xw0Tsjwk0=
 github.com/kr/pretty v0.3.0/go.mod h1:640gp4NfQd8pI5XOwp5fnNeVWj67G7CFk/SaSQn7NBk=
 github.com/kr/text v0.2.0 h1:5Nx0Ya0ZqY2ygV366QzturHI13Jq95ApcVaJBhpS+AY=
@@ -86,6 +88,8 @@ github.com/muesli/termenv v0.15.2 h1:GohcuySI0QmI3wN8Ok9PtKGkgkFIk7y6Vpb5PvrY+Wo
 github.com/muesli/termenv v0.15.2/go.mod h1:Epx+iuz8sNs7mNKhxzH4fWXGNpZwUaJKRS1noLXviQ8=
 github.com/pelletier/go-toml/v2 v2.2.3 h1:YmeHyLY8mFWbdkNWwpr+qIL2bEqT0o95WSdkNHvL12M=
 github.com/pelletier/go-toml/v2 v2.2.3/go.mod h1:MfCQTFTvCcUyyvvwm1+G6H/jORL20Xlb6rzQu9GuUkc=
+github.com/pkg/sftp v1.13.7 h1:uv+I3nNJvlKZIQGSr8JVQLNHFU9YhhNpvC14Y6KgmSM=
+github.com/pkg/sftp v1.13.7/go.mod h1:KMKI0t3T6hfA+lTR/ssZdunHo+uwq7ghoN09/FSu3DY=
 github.com/pmezard/go-difflib v1.0.0 h1:4DBwDE0NGyQoBHbLQYPwSUPoCMWR5BEzIk/f1lZbAQM=
 github.com/pmezard/go-difflib v1.0.0/go.mod h1:iKH77koFhYxTK1pcRnkKkqfTogsbg7gZNVY4sRDYZ/4=
 github.com/rivo/uniseg v0.1.0/go.mod h1:J6wj4VEh+S6ZtnVlnTBMWIodfgj8LQOQFoIToxlJtxc=
@@ -114,23 +118,61 @@ github.com/urfave/cli/v2 v2.27.5 h1:WoHEJLdsXr6dDWoJgMq/CboDmyY/8HMMH1fTECbih+w=
 github.com/urfave/cli/v2 v2.27.5/go.mod h1:3Sevf16NykTbInEnD0yKkjDAeZDS0A6bzhBH5hrMvTQ=
 github.com/xrash/smetrics v0.0.0-20240521201337-686a1a2994c1 h1:gEOO8jv9F4OT7lGCjxCBTO/36wtF6j2nSip77qHd4x4=
 github.com/xrash/smetrics v0.0.0-20240521201337-686a1a2994c1/go.mod h1:Ohn+xnUBiLI6FVj/9LpzZWtj1/D6lUovWYBkxHVV3aM=
+github.com/yuin/goldmark v1.4.13/go.mod h1:6yULJ656Px+3vBD8DxQVa3kxgyrAnzto9xy5taEt/CY=
 golang.org/x/arch v0.12.0 h1:UsYJhbzPYGsT0HbEdmYcqtCv8UNGvnaL561NnIUvaKg=
 golang.org/x/arch v0.12.0/go.mod h1:FEVrYAQjsQXMVJ1nsMoVVXPZg6p2JE2mx8psSWTDQys=
+golang.org/x/crypto v0.0.0-20190308221718-c2843e01d9a2/go.mod h1:djNgcEr1/C05ACkg1iLfiJU5Ep61QUkGW8qpdssI0+w=
+golang.org/x/crypto v0.0.0-20210921155107-089bfa567519/go.mod h1:GvvjBRRGRdwPK5ydBHafDWAxML/pGHZbMvKqRZ5+Abc=
+golang.org/x/crypto v0.17.0/go.mod h1:gCAAfMLgwOJRpTjQ2zCCt2OcSfYMTeZVSRtQlPC7Nq4=
 golang.org/x/crypto v0.31.0 h1:ihbySMvVjLAeSH1IbfcRTkD/iNscyz8rGzjF/E5hV6U=
 golang.org/x/crypto v0.31.0/go.mod h1:kDsLvtWBEx7MV9tJOj9bnXsPbxwJQ6csT/x4KIN4Ssk=
 golang.org/x/exp v0.0.0-20231006140011-7918f672742d h1:jtJma62tbqLibJ5sFQz8bKtEM8rJBtfilJ2qTU199MI=
 golang.org/x/exp v0.0.0-20231006140011-7918f672742d/go.mod h1:ldy0pHrwJyGW56pPQzzkH36rKxoZW1tw7ZJpeKx+hdo=
+golang.org/x/mod v0.6.0-dev.0.20220419223038-86c51ed26bb4/go.mod h1:jJ57K6gSWd91VN4djpZkiMVwK6gcyfeH4XE8wZrZaV4=
+golang.org/x/mod v0.8.0/go.mod h1:iBbtSCu2XBx23ZKBPSOrRkjjQPZFPuis4dIYUhu/chs=
+golang.org/x/net v0.0.0-20190620200207-3b0461eec859/go.mod h1:z5CRVTTTmAJ677TzLLGU+0bjPO0LkuOLi4/5GtJWs/s=
+golang.org/x/net v0.0.0-20210226172049-e18ecbb05110/go.mod h1:m0MpNAwzfU5UDzcl9v0D8zg8gWTRqZa9RBIspLL5mdg=
+golang.org/x/net v0.0.0-20220722155237-a158d28d115b/go.mod h1:XRhObCWvk6IyKnWLug+ECip1KBveYUHfp+8e9klMJ9c=
+golang.org/x/net v0.6.0/go.mod h1:2Tu9+aMcznHK/AK1HMvgo6xiTLG5rD5rZLDS+rp2Bjs=
+golang.org/x/net v0.10.0/go.mod h1:0qNGK6F8kojg2nk9dLZ2mShWaEBan6FAoqfSigmmuDg=
 golang.org/x/net v0.33.0 h1:74SYHlV8BIgHIFC/LrYkOGIwL19eTYXQ5wc6TBuO36I=
 golang.org/x/net v0.33.0/go.mod h1:HXLR5J+9DxmrqMwG9qjGCxZ+zKXxBru04zlTvWlWuN4=
+golang.org/x/sync v0.0.0-20190423024810-112230192c58/go.mod h1:RxMgew5VJxzue5/jJTE5uejpjVlOe/izrB70Jof72aM=
+golang.org/x/sync v0.0.0-20220722155255-886fb9371eb4/go.mod h1:RxMgew5VJxzue5/jJTE5uejpjVlOe/izrB70Jof72aM=
+golang.org/x/sync v0.1.0/go.mod h1:RxMgew5VJxzue5/jJTE5uejpjVlOe/izrB70Jof72aM=
 golang.org/x/sync v0.10.0 h1:3NQrjDixjgGwUOCaF8w2+VYHv0Ve/vGYSbdkTa98gmQ=
 golang.org/x/sync v0.10.0/go.mod h1:Czt+wKu1gCyEFDUtn0jG5QVvpJ6rzVqr5aXyt9drQfk=
+golang.org/x/sys v0.0.0-20190215142949-d0b11bdaac8a/go.mod h1:STP8DvDyc/dI5b8T5hshtkjS+E42TnysNCUPdjciGhY=
+golang.org/x/sys v0.0.0-20201119102817-f84b799fce68/go.mod h1:h1NjWce9XRLGQEsW7wpKNCjG9DtNlClVuFLEZdDNbEs=
+golang.org/x/sys v0.0.0-20210615035016-665e8c7367d1/go.mod h1:oPkhp1MJrh7nUepCBck5+mAzfO9JrbApNNgaTdGDITg=
+golang.org/x/sys v0.0.0-20220520151302-bc2c85ada10a/go.mod h1:oPkhp1MJrh7nUepCBck5+mAzfO9JrbApNNgaTdGDITg=
+golang.org/x/sys v0.0.0-20220722155257-8c9f86f7a55f/go.mod h1:oPkhp1MJrh7nUepCBck5+mAzfO9JrbApNNgaTdGDITg=
+golang.org/x/sys v0.5.0/go.mod h1:oPkhp1MJrh7nUepCBck5+mAzfO9JrbApNNgaTdGDITg=
 golang.org/x/sys v0.6.0/go.mod h1:oPkhp1MJrh7nUepCBck5+mAzfO9JrbApNNgaTdGDITg=
+golang.org/x/sys v0.8.0/go.mod h1:oPkhp1MJrh7nUepCBck5+mAzfO9JrbApNNgaTdGDITg=
+golang.org/x/sys v0.15.0/go.mod h1:/VUhepiaJMQUp4+oa/7Zr1D23ma6VTLIYjOOTFZPUcA=
 golang.org/x/sys v0.29.0 h1:TPYlXGxvx1MGTn2GiZDhnjPA9wZzZeGKHHmKhHYvgaU=
 golang.org/x/sys v0.29.0/go.mod h1:/VUhepiaJMQUp4+oa/7Zr1D23ma6VTLIYjOOTFZPUcA=
+golang.org/x/term v0.0.0-20201126162022-7de9c90e9dd1/go.mod h1:bj7SfCRtBDWHUb9snDiAeCFNEtKQo2Wmx5Cou7ajbmo=
+golang.org/x/term v0.0.0-20210927222741-03fcf44c2211/go.mod h1:jbD1KX2456YbFQfuXm/mYQcufACuNUgVhRMnK/tPxf8=
+golang.org/x/term v0.5.0/go.mod h1:jMB1sMXY+tzblOD4FWmEbocvup2/aLOaQEp7JmGp78k=
+golang.org/x/term v0.8.0/go.mod h1:xPskH00ivmX89bAKVGSKKtLOWNx2+17Eiy94tnKShWo=
+golang.org/x/term v0.15.0/go.mod h1:BDl952bC7+uMoWR75FIrCDx79TPU9oHkTZ9yRbYOrX0=
 golang.org/x/term v0.28.0 h1:/Ts8HFuMR2E6IP/jlo7QVLZHggjKQbhu/7H0LJFr3Gg=
 golang.org/x/term v0.28.0/go.mod h1:Sw/lC2IAUZ92udQNf3WodGtn4k/XoLyZoh8v/8uiwek=
+golang.org/x/text v0.3.0/go.mod h1:NqM8EUOU14njkJ3fqMW+pc6Ldnwhi/IjpwHt7yyuwOQ=
+golang.org/x/text v0.3.3/go.mod h1:5Zoc/QRtKVWzQhOtBMvqHzDpF6irO9z98xDceosuGiQ=
+golang.org/x/text v0.3.7/go.mod h1:u+2+/6zg+i71rQMx5EYifcz6MCKuco9NR6JIITiCfzQ=
+golang.org/x/text v0.7.0/go.mod h1:mrYo+phRRbMaCq/xk9113O4dZlRixOauAjOtrjsXDZ8=
+golang.org/x/text v0.9.0/go.mod h1:e1OnstbJyHTd6l/uOt8jFFHp6TRDWZR/bV3emEE/zU8=
+golang.org/x/text v0.14.0/go.mod h1:18ZOQIKpY8NJVqYksKHtTdi31H5itFRjB5/qKTNYzSU=
 golang.org/x/text v0.21.0 h1:zyQAAkrwaneQ066sspRyJaG9VNi/YJ1NfzcGB3hZ/qo=
 golang.org/x/text v0.21.0/go.mod h1:4IBbMaMmOPCJ8SecivzSH54+73PCFmPWxNTLm+vZkEQ=
+golang.org/x/tools v0.0.0-20180917221912-90fa682c2a6e/go.mod h1:n7NCudcB/nEzxVGmLbDWY5pfWTLqBcC2KZ6jyYvM4mQ=
+golang.org/x/tools v0.0.0-20191119224855-298f0cb1881e/go.mod h1:b+2E5dAYhXwXZwtnZ6UAqBI28+e2cm9otk0dWdXHAEo=
+golang.org/x/tools v0.1.12/go.mod h1:hNGJHUnrk76NpqgfD5Aqm5Crs+Hm0VOH/i9J2+nxYbc=
+golang.org/x/tools v0.6.0/go.mod h1:Xwgl3UAJ/d3gWutnCtw505GrjyAbvKui8lOU390QaIU=
+golang.org/x/xerrors v0.0.0-20190717185122-a985d3407aa7/go.mod h1:I/5z698sn9Ka8TeJc9MKroUUfqBBauWjQqLJ2OPfmY0=
 google.golang.org/protobuf v1.36.0 h1:mjIs9gYtt56AzC4ZaffQuh88TZurBGhIJMBZGSxNerQ=
 google.golang.org/protobuf v1.36.0/go.mod h1:9fA7Ob0pmnwhb644+1+CVWFRbNajQ6iRojtC/QF5bRE=
 gopkg.in/check.v1 v0.0.0-20161208181325-20d25e280405/go.mod h1:Co6ibVJAznAaIkqp8huTwlJQCZ016jof/cbN4VW5Yz0=

prod-docker.env

@@ -1,5 +1,4 @@
-# These are default values, please change these!
-
 POSTGRES_USERNAME=hermes
 POSTGRES_PASSWORD=hermes
 POSTGRES_DB=hermes
+JWT_SECRET=hermes

shell.nix

@@ -3,7 +3,6 @@
 }: pkgs.mkShell {
   buildInputs = with pkgs; [
     # api/
-    nodejs
     go
     gopls
   ];