fix: correct logic when checking tcpip-forward request

server/http.go

@@ -10,8 +10,11 @@ import (
 	"net"
 	"regexp"
 	"strings"
+	"time"
 	"tunnel_pls/session"
 	"tunnel_pls/utils"
+
+	"golang.org/x/crypto/ssh"
 )
 
 type Interaction interface {
@@ -295,30 +298,38 @@ func Handler(conn net.Conn) {
 
 func forwardRequest(cw *CustomWriter, initialRequest *RequestHeaderFactory, sshSession *session.SSHSession) {
 	payload := sshSession.Forwarder.CreateForwardedTCPIPPayload(cw.RemoteAddr)
-	channel, reqs, err := sshSession.Lifecycle.GetConnection().OpenChannel("forwarded-tcpip", payload)
-	if err != nil {
-		log.Printf("Failed to open forwarded-tcpip channel: %v", err)
-		if closer, ok := cw.writer.(io.Closer); ok {
-			if closeErr := closer.Close(); closeErr != nil {
-				log.Printf("Failed to close connection: %v", closeErr)
-			}
+
+	type channelResult struct {
+		channel ssh.Channel
+		reqs    <-chan *ssh.Request
+		err     error
+	}
+	resultChan := make(chan channelResult, 1)
+
+	go func() {
+		channel, reqs, err := sshSession.Lifecycle.GetConnection().OpenChannel("forwarded-tcpip", payload)
+		resultChan <- channelResult{channel, reqs, err}
+	}()
+
+	var channel ssh.Channel
+	var reqs <-chan *ssh.Request
+
+	select {
+	case result := <-resultChan:
+		if result.err != nil {
+			log.Printf("Failed to open forwarded-tcpip channel: %v", result.err)
+			sshSession.Forwarder.WriteBadGatewayResponse(cw.writer)
+			return
 		}
+		channel = result.channel
+		reqs = result.reqs
+	case <-time.After(5 * time.Second):
+		log.Printf("Timeout opening forwarded-tcpip channel")
+		sshSession.Forwarder.WriteBadGatewayResponse(cw.writer)
 		return
 	}
 
-	go func() {
-		defer func() {
-			if r := recover(); r != nil {
-				log.Printf("Panic in request handler goroutine: %v", r)
-			}
-		}()
-		for req := range reqs {
-			if err := req.Reply(false, nil); err != nil {
-				log.Printf("Failed to reply to request: %v", err)
-				return
-			}
-		}
-	}()
+	go ssh.DiscardRequests(reqs)
 
 	fingerprintMiddleware := NewTunnelFingerprint()
 	forwardedForMiddleware := NewForwardedFor(cw.RemoteAddr)
@@ -329,14 +340,13 @@ func forwardRequest(cw *CustomWriter, initialRequest *RequestHeaderFactory, sshS
 	cw.reqHeader = initialRequest
 
 	for _, m := range cw.reqStartMW {
-		err = m.HandleRequest(cw.reqHeader)
-		if err != nil {
+		if err := m.HandleRequest(cw.reqHeader); err != nil {
 			log.Printf("Error handling request: %v", err)
 			return
 		}
 	}
 
-	_, err = channel.Write(initialRequest.Finalize())
+	_, err := channel.Write(initialRequest.Finalize())
 	if err != nil {
 		log.Printf("Failed to forward request: %v", err)
 		return