feature: Adds basic TCP support for SSHAppBackend.

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
+	}
+}