works

.golangci.toml

@@ -0,0 +1,6 @@
+#:schema https://golangci-lint.run/jsonschema/golangci.jsonschema.json
+version = "2"
+
+[[linters.exclusions.rules]]
+linters = [ "errcheck" ]
+source = "^\\s*defer\\s+"

cmd/link.go

@@ -1,44 +1,34 @@
 package cmd
 
 import (
-	"bytes"
 	"fmt"
-	"io"
 	"log"
-	"net/http"
+	"net"
+	"sync"
 
 	"github.com/gorilla/websocket"
 	"github.com/spf13/cobra"
 )
 
-type TunnelRequest struct {
-	ID      string            `json:"id"`
-	Method  string            `json:"method"`
-	URL     string            `json:"url"`
-	Headers map[string]string `json:"headers"`
-	Body    []byte            `json:"body"`
-}
-
-type TunnelResponse struct {
-	ID         string            `json:"id"`
-	StatusCode int               `json:"status_code"`
-	Headers    map[string]string `json:"headers"`
-	Body       []byte            `json:"body"`
+type TunnelMessage struct {
+	Type     string `json:"type"`
+	StreamID string `json:"stream_id"`
+	Data     []byte `json:"data,omitempty"`
 }
 
 var serverAddr string
 
 var linkCmd = &cobra.Command{
-	Use:   "link <vhost_location> <local_port>",
+	Use:   "link <vhost_location> <host:port>",
 	Short: "Create a tunnel link",
 	Args:  cobra.ExactArgs(2),
 	Run: func(cmd *cobra.Command, args []string) {
 		vhostLoc := args[0]
-		localPort := args[1]
+		hostPort := args[1]
 
-		fmt.Printf("Creating tunnel: %s -> localhost:%s\n", vhostLoc, localPort)
+		fmt.Printf("Creating TCP tunnel: %s -> %s\n", vhostLoc, hostPort)
 
-		if err := startTunnel(vhostLoc, localPort); err != nil {
+		if err := startTCPTunnel(vhostLoc, hostPort); err != nil {
 			log.Fatal("Failed to start tunnel:", err)
 		}
 	},
@@ -48,8 +38,7 @@ func init() {
 	linkCmd.Flags().StringVarP(&serverAddr, "server", "s", "localhost:8080", "Conduit server address")
 }
 
-func startTunnel(vhost, localPort string) error {
-	// Connect to WebSocket
+func startTCPTunnel(vhost, hostPort string) error {
 	wsURL := fmt.Sprintf("ws://%s/_conduit/tunnel?vhost=%s", serverAddr, vhost)
 	conn, _, err := websocket.DefaultDialer.Dial(wsURL, nil)
 	if err != nil {
@@ -57,80 +46,86 @@ func startTunnel(vhost, localPort string) error {
 	}
 	defer conn.Close()
 
-	fmt.Printf("Tunnel active! %s.example.com -> localhost:%s\n", vhost, localPort)
+	fmt.Printf("TCP Tunnel active! %s.example.com -> %s\n", vhost, hostPort)
 
-	// Handle incoming requests
+	// Track active connections
+	connections := make(map[string]net.Conn)
+	var connMutex sync.RWMutex
+
+	// Handle messages from server
 	for {
-		var req TunnelRequest
-		if err := conn.ReadJSON(&req); err != nil {
-			log.Printf("Error reading request: %v", err)
+		var msg TunnelMessage
+		err := conn.ReadJSON(&msg)
+		if err != nil {
+			log.Printf("Error reading from tunnel: %v", err)
 			break
 		}
 
-		go handleTunnelRequest(conn, &req, localPort)
+		switch msg.Type {
+		case "data":
+			connMutex.RLock()
+			localConn, exists := connections[msg.StreamID]
+			connMutex.RUnlock()
+
+			if !exists {
+				// New connection
+				localConn, err = net.Dial("tcp", hostPort)
+				if err != nil {
+					log.Printf("Failed to connect to %s: %v", hostPort, err)
+					continue
+				}
+
+				connMutex.Lock()
+				connections[msg.StreamID] = localConn
+				connMutex.Unlock()
+
+				// Start reading from local connection
+				go func(streamID string, lConn net.Conn) {
+					defer func() {
+						connMutex.Lock()
+						delete(connections, streamID)
+						connMutex.Unlock()
+						lConn.Close()
+					}()
+
+					buffer := make([]byte, 4096)
+					for {
+						n, err := lConn.Read(buffer)
+						if err != nil {
+							break
+						}
+
+						response := TunnelMessage{
+							Type:     "data",
+							StreamID: streamID,
+							Data:     buffer[:n],
+						}
+
+						if err := conn.WriteJSON(response); err != nil {
+							break
+						}
+					}
+				}(msg.StreamID, localConn)
+			}
+
+			// Write data to local connection
+			if _, err := localConn.Write(msg.Data); err != nil {
+				log.Printf("Error writing to local connection: %v", err)
+				localConn.Close()
+				connMutex.Lock()
+				delete(connections, msg.StreamID)
+				connMutex.Unlock()
+			}
+
+		case "close":
+			connMutex.Lock()
+			if localConn, exists := connections[msg.StreamID]; exists {
+				localConn.Close()
+				delete(connections, msg.StreamID)
+			}
+			connMutex.Unlock()
+		}
 	}
 
 	return nil
 }
-
-func handleTunnelRequest(conn *websocket.Conn, req *TunnelRequest, localPort string) {
-	// Make request to local service
-	localURL := fmt.Sprintf("http://localhost:%s%s", localPort, req.URL)
-
-	httpReq, err := http.NewRequest(req.Method, localURL, bytes.NewReader(req.Body))
-	if err != nil {
-		sendErrorResponse(conn, req.ID, 500, "Failed to create request")
-		return
-	}
-
-	// Set headers
-	for k, v := range req.Headers {
-		httpReq.Header.Set(k, v)
-	}
-
-	// Make the request
-	client := &http.Client{}
-	resp, err := client.Do(httpReq)
-	if err != nil {
-		sendErrorResponse(conn, req.ID, 502, "Failed to reach local service")
-		return
-	}
-	defer resp.Body.Close()
-
-	// Read response body
-	body, err := io.ReadAll(resp.Body)
-	if err != nil {
-		sendErrorResponse(conn, req.ID, 500, "Failed to read response")
-		return
-	}
-
-	// Convert response headers
-	headers := make(map[string]string)
-	for k, v := range resp.Header {
-		if len(v) > 0 {
-			headers[k] = v[0]
-		}
-	}
-
-	// Send response back
-	tunnelResp := &TunnelResponse{
-		ID:         req.ID,
-		StatusCode: resp.StatusCode,
-		Headers:    headers,
-		Body:       body,
-	}
-
-	if err := conn.WriteJSON(tunnelResp); err != nil {
-		log.Printf("Error sending response: %v", err)
-	}
-}
-
-func sendErrorResponse(conn *websocket.Conn, reqID string, statusCode int, message string) {
-	resp := &TunnelResponse{
-		ID:         reqID,
-		StatusCode: statusCode,
-		Headers:    map[string]string{"Content-Type": "text/plain"},
-		Body:       []byte(message),
-	}
-	conn.WriteJSON(resp)
-}

server/server.go

@@ -1,9 +1,11 @@
 package server
 
 import (
+	"bufio"
+	"bytes"
 	"fmt"
-	"io"
 	"log"
+	"net"
 	"net/http"
 	"strings"
 	"sync"
@@ -13,25 +15,15 @@ import (
 )
 
 type TunnelConnection struct {
-	conn      *websocket.Conn
-	vhost     string
-	responses map[string]chan *TunnelResponse
-	mu        sync.RWMutex
+	*websocket.Conn
+	vhost   string
+	streams map[string]chan []byte // StreamID -> data channel
 }
 
-type TunnelRequest struct {
-	ID      string            `json:"id"`
-	Method  string            `json:"method"`
-	URL     string            `json:"url"`
-	Headers map[string]string `json:"headers"`
-	Body    []byte            `json:"body"`
-}
-
-type TunnelResponse struct {
-	ID         string            `json:"id"`
-	StatusCode int               `json:"status_code"`
-	Headers    map[string]string `json:"headers"`
-	Body       []byte            `json:"body"`
+type TunnelMessage struct {
+	Type     string `json:"type"`
+	StreamID string `json:"stream_id"`
+	Data     []byte `json:"data,omitempty"`
 }
 
 type Server struct {
@@ -52,177 +44,26 @@ func NewServer() *Server {
 }
 
 func (s *Server) Start(addr string) error {
-	http.HandleFunc("/", s.handleRequest)
-	http.HandleFunc("/_conduit/tunnel", s.handleTunnel)
-	http.HandleFunc("/_conduit/status", s.handleStatus)
+	// Raw TCP listener instead of http.ListenAndServe
+	listener, err := net.Listen("tcp", addr)
+	if err != nil {
+		return err
+	}
+	defer listener.Close()
 
 	log.Printf("Conduit server listening on %s", addr)
-	return http.ListenAndServe(addr, nil)
-}
 
-func (s *Server) handleRequest(w http.ResponseWriter, r *http.Request) {
-	host := r.Host
-	subdomain := s.extractSubdomain(host)
-
-	if subdomain == "" {
-		http.Error(w, "Invalid host", http.StatusBadRequest)
-		return
-	}
-
-	s.mu.RLock()
-	tunnel, exists := s.tunnels[subdomain]
-	s.mu.RUnlock()
-
-	if !exists {
-		http.Error(w, "Tunnel not found", http.StatusNotFound)
-		return
-	}
-
-	// Create unique request ID
-	reqID := fmt.Sprintf("%d", time.Now().UnixNano())
-
-	// Read request body
-	body, err := io.ReadAll(r.Body)
-	if err != nil {
-		http.Error(w, "Failed to read request body", http.StatusBadRequest)
-		return
-	}
-	defer r.Body.Close()
-
-	// Convert headers
-	headers := make(map[string]string)
-	for k, v := range r.Header {
-		if len(v) > 0 {
-			headers[k] = v[0]
-		}
-	}
-
-	// Create response channel for this request
-	respChan := make(chan *TunnelResponse, 1)
-	tunnel.mu.Lock()
-	tunnel.responses[reqID] = respChan
-	tunnel.mu.Unlock()
-
-	// Clean up response channel when done
-	defer func() {
-		tunnel.mu.Lock()
-		delete(tunnel.responses, reqID)
-		tunnel.mu.Unlock()
-	}()
-
-	tunnelReq := &TunnelRequest{
-		ID:      reqID,
-		Method:  r.Method,
-		URL:     r.URL.String(),
-		Headers: headers,
-		Body:    body,
-	}
-
-	// Send request to tunnel
-	if err := tunnel.conn.WriteJSON(tunnelReq); err != nil {
-		log.Printf("Error sending request to tunnel: %v", err)
-		http.Error(w, "Tunnel communication error", http.StatusServiceUnavailable)
-		return
-	}
-
-	// Wait for response
-	select {
-	case resp := <-respChan:
-		// Write response headers
-		for k, v := range resp.Headers {
-			w.Header().Set(k, v)
-		}
-		w.WriteHeader(resp.StatusCode)
-		w.Write(resp.Body)
-
-	case <-time.After(30 * time.Second):
-		http.Error(w, "Tunnel timeout", http.StatusGatewayTimeout)
-	}
-}
-
-func (s *Server) handleTunnel(w http.ResponseWriter, r *http.Request) {
-	vhost := r.URL.Query().Get("vhost")
-	if vhost == "" {
-		http.Error(w, "Missing vhost parameter", http.StatusBadRequest)
-		return
-	}
-
-	conn, err := s.upgrader.Upgrade(w, r, nil)
-	if err != nil {
-		log.Printf("WebSocket upgrade failed: %v", err)
-		return
-	}
-
-	tunnel := &TunnelConnection{
-		conn:      conn,
-		vhost:     vhost,
-		responses: make(map[string]chan *TunnelResponse),
-	}
-
-	s.mu.Lock()
-	s.tunnels[vhost] = tunnel
-	s.mu.Unlock()
-
-	log.Printf("Tunnel established: %s", vhost)
-
-	// Handle tunnel communication
-	s.handleTunnelConnection(tunnel)
-}
-
-func (s *Server) handleTunnelConnection(tunnel *TunnelConnection) {
-	defer func() {
-		s.mu.Lock()
-		delete(s.tunnels, tunnel.vhost)
-		s.mu.Unlock()
-		tunnel.conn.Close()
-		log.Printf("Tunnel closed: %s", tunnel.vhost)
-	}()
-
-	// Handle incoming responses from client
 	for {
-		var resp TunnelResponse
-		if err := tunnel.conn.ReadJSON(&resp); err != nil {
-			log.Printf("Error reading response from tunnel %s: %v", tunnel.vhost, err)
-			return
+		conn, err := listener.Accept()
+		if err != nil {
+			log.Printf("Error accepting connection: %v", err)
+			continue
 		}
 
-		// Find the response channel for this request
-		tunnel.mu.RLock()
-		respChan, exists := tunnel.responses[resp.ID]
-		tunnel.mu.RUnlock()
-
-		if exists {
-			select {
-			case respChan <- &resp:
-				// Response delivered
-			default:
-				log.Printf("Response channel full for request %s", resp.ID)
-			}
-		} else {
-			log.Printf("No response channel found for request %s", resp.ID)
-		}
+		go s.handleRawConnection(conn)
 	}
 }
 
-func (s *Server) handleStatus(w http.ResponseWriter, r *http.Request) {
-	s.mu.RLock()
-	defer s.mu.RUnlock()
-
-	w.Header().Set("Content-Type", "application/json")
-	fmt.Fprintf(w, `{"tunnels": %d, "active": [`, len(s.tunnels))
-
-	first := true
-	for vhost := range s.tunnels {
-		if !first {
-			fmt.Fprint(w, ",")
-		}
-		fmt.Fprintf(w, `{"vhost":"%s"}`, vhost)
-		first = false
-	}
-
-	fmt.Fprint(w, "]}")
-}
-
 func (s *Server) extractSubdomain(host string) string {
 	if idx := strings.Index(host, ":"); idx != -1 {
 		host = host[:idx]
@@ -235,3 +76,259 @@ func (s *Server) extractSubdomain(host string) string {
 
 	return ""
 }
+
+func (s *Server) handleStatus(conn net.Conn) {
+	s.mu.RLock()
+	count := len(s.tunnels)
+	s.mu.RUnlock()
+
+	response := fmt.Sprintf(
+		"HTTP/1.1 200 OK\r\n"+
+			"Content-Type: application/json\r\n"+
+			"Content-Length: %d\r\n\r\n"+
+			`{"tunnels": %d}`,
+		len(fmt.Sprintf(`{"tunnels": %d}`, count)), count)
+
+	conn.Write([]byte(response))
+}
+
+func (s *Server) extractHostFromHTTP(data []byte) string {
+	// Simple HTTP header parsing
+	lines := strings.Split(string(data), "\r\n")
+	for _, line := range lines {
+		if strings.HasPrefix(strings.ToLower(line), "host:") {
+			parts := strings.SplitN(line, ":", 2)
+			if len(parts) == 2 {
+				return strings.TrimSpace(parts[1])
+			}
+		}
+	}
+	return ""
+}
+
+func (s *Server) proxyRawConnection(clientConn net.Conn, tunnelConn *TunnelConnection, initialData []byte) {
+	defer clientConn.Close()
+
+	// Generate a unique stream ID for this connection
+	streamID := fmt.Sprintf("stream_%d", time.Now().UnixNano())
+
+	// Send initial data with stream ID
+	msg := TunnelMessage{
+		Type:     "data",
+		StreamID: streamID,
+		Data:     initialData,
+	}
+
+	if err := tunnelConn.WriteJSON(msg); err != nil {
+		log.Printf("Error sending initial data: %v", err)
+		return
+	}
+
+	// Create a channel for this stream's responses
+	responseChan := make(chan []byte, 100)
+
+	// Register this stream
+	s.mu.Lock()
+	if tunnelConn.streams == nil {
+		tunnelConn.streams = make(map[string]chan []byte)
+	}
+	tunnelConn.streams[streamID] = responseChan
+	s.mu.Unlock()
+
+	// Clean up when done
+	defer func() {
+		s.mu.Lock()
+		delete(tunnelConn.streams, streamID)
+		close(responseChan)
+		s.mu.Unlock()
+
+		// Send close message
+		closeMsg := TunnelMessage{
+			Type:     "close",
+			StreamID: streamID,
+		}
+		tunnelConn.WriteJSON(closeMsg)
+	}()
+
+	// Handle client -> tunnel
+	go func() {
+		buffer := make([]byte, 4096)
+		for {
+			n, err := clientConn.Read(buffer)
+			if err != nil {
+				return
+			}
+
+			msg := TunnelMessage{
+				Type:     "data",
+				StreamID: streamID,
+				Data:     buffer[:n],
+			}
+
+			if err := tunnelConn.WriteJSON(msg); err != nil {
+				return
+			}
+		}
+	}()
+
+	// Handle tunnel -> client (read from response channel)
+	for data := range responseChan {
+		if _, err := clientConn.Write(data); err != nil {
+			break
+		}
+	}
+}
+
+func (s *Server) handleRawConnection(conn net.Conn) {
+	defer conn.Close()
+
+	// Read enough to get the Host header
+	buffer := make([]byte, 4096)
+	n, err := conn.Read(buffer)
+	if err != nil {
+		return
+	}
+
+	// Extract host
+	host := s.extractHostFromHTTP(buffer[:n])
+	subdomain := s.extractSubdomain(host)
+
+	// If we have a registered tunnel for this subdomain, relay it
+	if subdomain != "" {
+		s.mu.RLock()
+		tunnelConn, exists := s.tunnels[subdomain]
+		s.mu.RUnlock()
+
+		if exists {
+			log.Printf("Relaying %s to tunnel", subdomain)
+			s.proxyRawConnection(conn, tunnelConn, buffer[:n])
+			return
+		}
+	}
+
+	// Otherwise, handle as control server (recreate HTTP request and use net/http)
+	s.handleAsHTTP(conn, buffer[:n])
+}
+
+func (s *Server) handleAsHTTP(conn net.Conn, initialData []byte) {
+	// Create a fake HTTP request from the raw data
+	reader := bufio.NewReader(bytes.NewReader(initialData))
+	req, err := http.ReadRequest(reader)
+	if err != nil {
+		conn.Write([]byte("HTTP/1.1 400 Bad Request\r\n\r\n"))
+		return
+	}
+
+	// Handle control endpoints
+	if req.URL.Path == "/_conduit/tunnel" {
+		s.handleTunnelUpgrade(conn, req)
+	} else if req.URL.Path == "/_conduit/status" {
+		s.handleStatus(conn)
+	} else {
+		conn.Write([]byte("HTTP/1.1 404 Not Found\r\n\r\n"))
+	}
+}
+
+func (s *Server) handleTunnelMessages(tunnel *TunnelConnection) {
+	for {
+		var msg TunnelMessage
+		err := tunnel.ReadJSON(&msg)
+		if err != nil {
+			break
+		}
+
+		// Route message to appropriate stream
+		if msg.Type == "data" && msg.StreamID != "" {
+			s.mu.RLock()
+			if streamChan, exists := tunnel.streams[msg.StreamID]; exists {
+				select {
+				case streamChan <- msg.Data:
+				case <-time.After(time.Second):
+					log.Printf("Stream %s channel full, dropping data", msg.StreamID)
+				}
+			}
+			s.mu.RUnlock()
+		}
+	}
+}
+func (s *Server) handleTunnelUpgrade(conn net.Conn, req *http.Request) {
+	vhost := req.URL.Query().Get("vhost")
+	if vhost == "" {
+		conn.Write([]byte("HTTP/1.1 400 Bad Request\r\n\r\nMissing vhost parameter"))
+		return
+	}
+
+	// Create a fake ResponseWriter that writes to our raw connection
+	fakeWriter := &fakeResponseWriter{conn: conn}
+
+	// Use the upgrader
+	wsConn, err := s.upgrader.Upgrade(fakeWriter, req, nil)
+	if err != nil {
+		log.Printf("WebSocket upgrade failed: %v", err)
+		return
+	}
+
+	// Create TunnelConnection
+	tunnel := &TunnelConnection{
+		Conn:    wsConn,
+		vhost:   vhost,
+		streams: make(map[string]chan []byte),
+	}
+
+	s.mu.Lock()
+	s.tunnels[vhost] = tunnel
+	s.mu.Unlock()
+
+	log.Printf("Tunnel established: %s", vhost)
+
+	// Keep connection alive and handle cleanup
+	defer func() {
+		s.mu.Lock()
+		delete(s.tunnels, vhost)
+		s.mu.Unlock()
+		wsConn.Close()
+		log.Printf("Tunnel closed: %s", vhost)
+	}()
+
+	// Handle tunnel messages
+	s.handleTunnelMessages(tunnel)
+}
+
+type fakeResponseWriter struct {
+	conn   net.Conn
+	header http.Header
+}
+
+func (f *fakeResponseWriter) Header() http.Header {
+	if f.header == nil {
+		f.header = make(http.Header)
+	}
+	return f.header
+}
+
+func (f *fakeResponseWriter) Write(data []byte) (int, error) {
+	return f.conn.Write(data)
+}
+
+func (f *fakeResponseWriter) WriteHeader(statusCode int) {
+	// Write HTTP status line
+	status := fmt.Sprintf("HTTP/1.1 %d %s\r\n", statusCode, http.StatusText(statusCode))
+	f.conn.Write([]byte(status))
+
+	// Write headers
+	for key, values := range f.header {
+		for _, value := range values {
+			f.conn.Write([]byte(fmt.Sprintf("%s: %s\r\n", key, value)))
+		}
+	}
+
+	// End headers
+	f.conn.Write([]byte("\r\n"))
+}
+
+// Implement http.Hijacker
+func (f *fakeResponseWriter) Hijack() (net.Conn, *bufio.ReadWriter, error) {
+	// Return the raw connection and create a ReadWriter for it
+	rw := bufio.NewReadWriter(bufio.NewReader(f.conn), bufio.NewWriter(f.conn))
+	return f.conn, rw, nil
+}

server/tunnel.go

@@ -0,0 +1,45 @@
+package server
+
+import (
+	"bufio"
+	"fmt"
+	"net"
+	"net/http"
+)
+
+type tunnelWriter struct {
+	conn   net.Conn
+	header http.Header
+}
+
+func (f *tunnelWriter) Header() http.Header {
+	if f.header == nil {
+		f.header = make(http.Header)
+	}
+	return f.header
+}
+
+func (f *tunnelWriter) Write(data []byte) (int, error) {
+	return f.conn.Write(data)
+}
+
+func (f *tunnelWriter) WriteHeader(statusCode int) {
+	// Write HTTP status line
+	status := fmt.Sprintf("HTTP/1.1 %d %s\r\n", statusCode, http.StatusText(statusCode))
+	f.conn.Write([]byte(status))
+
+	// Write headers
+	for key, values := range f.header {
+		for _, value := range values {
+			f.conn.Write([]byte(fmt.Sprintf("%s: %s\r\n", key, value)))
+		}
+	}
+
+	// End headers
+	f.conn.Write([]byte("\r\n"))
+}
+
+func (f *tunnelWriter) Hijack() (net.Conn, *bufio.ReadWriter, error) {
+	rw := bufio.NewReadWriter(bufio.NewReader(f.conn), bufio.NewWriter(f.conn))
+	return f.conn, rw, nil
+}