wip 2

client/client.go

@@ -2,17 +2,15 @@ package client
 
 import (
 	"fmt"
-	"net"
 	"net/url"
-	"sync"
 
 	"github.com/gorilla/websocket"
 	log "github.com/sirupsen/logrus"
 	"reichard.io/conduit/config"
-	"reichard.io/conduit/types"
+	"reichard.io/conduit/tunnel"
 )
 
-func NewTunnel(cfg *config.ClientConfig) (*Tunnel, error) {
+func NewTunnel(cfg *config.ClientConfig) (*tunnel.Tunnel, error) {
 	// Parse Server URL
 	serverURL, err := url.Parse(cfg.ServerAddress)
 	if err != nil {
@@ -43,117 +41,5 @@ func NewTunnel(cfg *config.ClientConfig) (*Tunnel, error) {
 		return nil, fmt.Errorf("failed to connect: %v", err)
 	}
 
-	return &Tunnel{
-		name:       cfg.TunnelName,
-		target:     cfg.TunnelTarget,
-		serverURL:  serverURL,
-		serverConn: serverConn,
-		localConns: make(map[string]net.Conn),
-	}, nil
-
-}
-
-type Tunnel struct {
-	name      string
-	target    string
-	serverURL *url.URL
-
-	serverConn *websocket.Conn
-	localConns map[string]net.Conn
-	mu         sync.RWMutex
-}
-
-func (t *Tunnel) Start() error {
-	log.Infof("starting tunnel: %s.%s -> %s\n", t.name, t.serverURL.Hostname(), t.target)
-	defer t.serverConn.Close()
-
-	// Handle Messages
-	for {
-		// Read Message
-		var msg types.Message
-		err := t.serverConn.ReadJSON(&msg)
-		if err != nil {
-			log.Errorf("error reading from tunnel: %v", err)
-			break
-		}
-
-		switch msg.Type {
-		case types.MessageTypeData:
-			localConn, err := t.getLocalConn(msg.StreamID)
-			if err != nil {
-				log.Errorf("failed to get local connection: %v", err)
-				continue
-			}
-
-			// Write data to local connection
-			if _, err := localConn.Write(msg.Data); err != nil {
-				log.Errorf("error writing to local connection: %v", err)
-				localConn.Close()
-				t.mu.Lock()
-				delete(t.localConns, msg.StreamID)
-				t.mu.Unlock()
-			}
-
-		case types.MessageTypeClose:
-			t.mu.Lock()
-			if localConn, exists := t.localConns[msg.StreamID]; exists {
-				localConn.Close()
-				delete(t.localConns, msg.StreamID)
-			}
-			t.mu.Unlock()
-		}
-	}
-
-	return nil
-}
-
-func (t *Tunnel) getLocalConn(streamID string) (net.Conn, error) {
-	// Get Cached Connection
-	t.mu.RLock()
-	localConn, exists := t.localConns[streamID]
-	t.mu.RUnlock()
-	if exists {
-		return localConn, nil
-	}
-
-	// Initiate Connection & Cache
-	localConn, err := net.Dial("tcp", t.target)
-	if err != nil {
-		log.Errorf("failed to connect to %s: %v", t.target, err)
-		return nil, err
-	}
-	t.mu.Lock()
-	t.localConns[streamID] = localConn
-	t.mu.Unlock()
-
-	// Start Response Relay & Return Connection
-	go t.startResponseRelay(streamID, localConn)
-	return localConn, nil
-}
-
-func (t *Tunnel) startResponseRelay(streamID string, localConn net.Conn) {
-	defer func() {
-		t.mu.Lock()
-		delete(t.localConns, streamID)
-		t.mu.Unlock()
-		localConn.Close()
-	}()
-
-	buffer := make([]byte, 4096)
-	for {
-		n, err := localConn.Read(buffer)
-		if err != nil {
-			break
-		}
-
-		response := types.Message{
-			Type:     types.MessageTypeData,
-			StreamID: streamID,
-			Data:     buffer[:n],
-		}
-
-		if err := t.serverConn.WriteJSON(response); err != nil {
-			break
-		}
-	}
+	return tunnel.NewClientTunnel(cfg.TunnelName, cfg.TunnelTarget, serverConn), nil
 }

cmd/tunnel.go

@@ -25,9 +25,7 @@ var tunnelCmd = &cobra.Command{
 
 		// Start Tunnel
 		log.Infof("creating TCP tunnel: %s -> %s", cfg.TunnelName, cfg.TunnelTarget)
-		if err := tunnel.Start(); err != nil {
-			log.Fatal("failed to start tunnel:", err)
-		}
+		tunnel.Start()
 	},
 }
 

server/server.go

@@ -151,7 +151,7 @@ func (s *Server) handleRawConnection(conn net.Conn) {
 
 	// Handle Tunnels
 	s.mu.RLock()
-	tunnelConn, exists := s.tunnels[subdomain]
+	conduitTunnel, exists := s.tunnels[subdomain]
 	s.mu.RUnlock()
 	if !exists {
 		w.WriteHeader(http.StatusNotFound)
@@ -159,11 +159,17 @@ func (s *Server) handleRawConnection(conn net.Conn) {
 		return
 	}
 
-	// Initialize New Stream
-	log.Infof("relaying %s to tunnel", subdomain)
+	// Add & Start Stream
 	reconstructedConn := newReconstructedConn(conn, &capturedData)
 	streamID := fmt.Sprintf("stream_%d", time.Now().UnixNano())
-	tunnelConn.NewStream(streamID, reconstructedConn)
+	if err := conduitTunnel.AddStream(streamID, reconstructedConn); err != nil {
+		w.WriteHeader(http.StatusInternalServerError)
+		_, _ = fmt.Fprintf(w, "failed to add stream: %v", err)
+		return
+	}
+
+	log.Infof("relaying %s to tunnel", subdomain)
+	_ = conduitTunnel.StartStream(streamID)
 }
 
 func (s *Server) handleAsHTTP(w http.ResponseWriter, r *http.Request) {
@@ -210,7 +216,7 @@ func (s *Server) createTunnel(w http.ResponseWriter, r *http.Request) {
 	}
 
 	// Create Tunnel
-	conduitTunnel := tunnel.NewTunnel(tunnelName, wsConn)
+	conduitTunnel := tunnel.NewServerTunnel(tunnelName, wsConn)
 	s.mu.Lock()
 	s.tunnels[tunnelName] = conduitTunnel
 	s.mu.Unlock()

tunnel/tunnel.go

@@ -1,7 +1,9 @@
 package tunnel
 
 import (
+	"fmt"
 	"io"
+	"net"
 	"sync"
 
 	"github.com/gorilla/websocket"
@@ -9,7 +11,7 @@ import (
 	"reichard.io/conduit/types"
 )
 
-func NewTunnel(name string, wsConn *websocket.Conn) *Tunnel {
+func NewServerTunnel(name string, wsConn *websocket.Conn) *Tunnel {
 	return &Tunnel{
 		name:    name,
 		wsConn:  wsConn,
@@ -17,16 +19,26 @@ func NewTunnel(name string, wsConn *websocket.Conn) *Tunnel {
 	}
 }
 
+func NewClientTunnel(name, target string, wsConn *websocket.Conn) *Tunnel {
+	return &Tunnel{
+		name:    name,
+		wsConn:  wsConn,
+		streams: make(map[string]io.ReadWriteCloser),
+		connBuilder: func() (io.ReadWriteCloser, error) {
+			return net.Dial("tcp", target)
+		},
+	}
+}
+
 type Tunnel struct {
 	name        string
 	wsConn      *websocket.Conn
 	streams     map[string]io.ReadWriteCloser
+	connBuilder func() (io.ReadWriteCloser, error)
 
 	wsMu, streamsMu sync.Mutex
 }
 
-// Start starts the tunnel and is the primary loop that handles all websocket messages.
-// Messages are relayed to the local stream.
 func (t *Tunnel) Start() {
 	for {
 		var msg types.Message
@@ -35,31 +47,71 @@ func (t *Tunnel) Start() {
 			return
 		}
 
+		// Validate Stream
 		if msg.StreamID == "" {
 			log.Warnf("tunnel %s missing streamID", t.name)
 			continue
 		}
 
+		// Ensure Stream
+		if err := t.initStreamConnection(msg.StreamID); err != nil {
+			log.WithError(err).Errorf("failed to initialize stream %s connection", t.name)
+			continue
+		}
+
+		// Handle Messages
 		switch msg.Type {
 		case types.MessageTypeClose:
-			t.CloseStream(msg.StreamID)
+			_ = t.CloseStream(msg.StreamID)
 		case types.MessageTypeData:
-			t.WriteStream(msg.StreamID, msg.Data)
+			_ = t.WriteStream(msg.StreamID, msg.Data)
 		}
 	}
 }
 
-func (t *Tunnel) NewStream(streamID string, localConn io.ReadWriteCloser) {
+func (t *Tunnel) initStreamConnection(streamID string) error {
+	if _, found := t.getStream(streamID); found {
+		return nil
+	}
+
+	conn, err := t.connBuilder()
+	if err != nil {
+		return err
+	}
+
+	if err := t.AddStream(streamID, conn); err != nil {
+		return err
+	}
+
+	go t.StartStream(streamID)
+	return nil
+}
+
+func (t *Tunnel) AddStream(streamID string, conn io.ReadWriteCloser) error {
 	t.streamsMu.Lock()
-	t.streams[streamID] = localConn
-	t.streamsMu.Unlock()
+	defer t.streamsMu.Unlock()
 
+	if _, found := t.streams[streamID]; found {
+		return fmt.Errorf("stream %s already exists", streamID)
+	}
+	t.streams[streamID] = conn
+	return nil
+}
+
+func (t *Tunnel) StartStream(streamID string) error {
+	// Get Stream
+	conn, found := t.getStream(streamID)
+	if !found {
+		return fmt.Errorf("stream %s does not exist", streamID)
+	}
+
+	// Start Stream
 	defer t.CloseStream(streamID)
 	buffer := make([]byte, 4096)
 	for {
-		n, err := localConn.Read(buffer)
+		n, err := conn.Read(buffer)
 		if err != nil {
-			return
+			return err
 		}
 
 		if err := t.sendWS(&types.Message{
@@ -67,22 +119,23 @@ func (t *Tunnel) NewStream(streamID string, localConn io.ReadWriteCloser) {
 			Data:     buffer[:n],
 			StreamID: streamID,
 		}); err != nil {
-			return
+			return err
 		}
 	}
 }
 
-func (t *Tunnel) WriteStream(streamID string, data []byte) {
-	t.streamsMu.Lock()
-	defer t.streamsMu.Unlock()
-	if localConn, ok := t.streams[streamID]; ok {
-		_, _ = localConn.Write(data)
-	} else {
-		log.Infof("stream %s does not exist", streamID)
-	}
+func (t *Tunnel) WriteStream(streamID string, data []byte) error {
+	// Get Stream
+	conn, found := t.getStream(streamID)
+	if !found {
+		return fmt.Errorf("stream %s does not exist", streamID)
 	}
 
-func (t *Tunnel) CloseStream(streamID string) {
+	_, err := conn.Write(data)
+	return err
+}
+
+func (t *Tunnel) CloseStream(streamID string) error {
 	_ = t.sendWS(&types.Message{
 		Type:     types.MessageTypeClose,
 		StreamID: streamID,
@@ -90,10 +143,11 @@ func (t *Tunnel) CloseStream(streamID string) {
 
 	t.streamsMu.Lock()
 	defer t.streamsMu.Unlock()
-	if localConn, ok := t.streams[streamID]; ok {
+	if conn, ok := t.streams[streamID]; ok {
 		delete(t.streams, streamID)
-		_ = localConn.Close()
+		return conn.Close()
 	}
+	return nil
 }
 
 func (t *Tunnel) Source() string {
@@ -105,3 +159,13 @@ func (t *Tunnel) sendWS(msg *types.Message) error {
 	defer t.wsMu.Unlock()
 	return t.wsConn.WriteJSON(msg)
 }
+
+func (t *Tunnel) getStream(streamID string) (io.ReadWriteCloser, bool) {
+	t.streamsMu.Lock()
+	defer t.streamsMu.Unlock()
+
+	if conn, ok := t.streams[streamID]; ok {
+		return conn, true
+	}
+	return nil, false
+}