fix: ensure SSH connections close on client disconnect

server/handler.go

@@ -11,7 +11,11 @@ func (s *Server) handleConnection(conn net.Conn) {
 	sshConn, chans, forwardingReqs, err := ssh.NewServerConn(conn, s.Config)
 	if err != nil {
 		log.Printf("failed to establish SSH connection: %v", err)
-		conn.Close()
+		err := conn.Close()
+		if err != nil {
+			log.Printf("failed to close SSH connection: %v", err)
+			return
+		}
 		return
 	}
 
@@ -21,5 +25,12 @@ func (s *Server) handleConnection(conn net.Conn) {
 	for ch := range chans {
 		newSession.ChannelChan <- ch
 	}
+
+	defer func(newSession *session.Session) {
+		err := newSession.Close()
+		if err != nil {
+			log.Printf("failed to close session: %v", err)
+		}
+	}(newSession)
 	return
 }

session/handler.go

@@ -83,17 +83,30 @@ func (s *Session) safeClose() {
 	})
 }
 
-func (s *Session) Close() {
+func (s *Session) Close() error {
 	if s.Listener != nil {
-		s.Listener.Close()
+		err := s.Listener.Close()
+		if err != nil && !errors.Is(err, net.ErrClosed) {
+			fmt.Println("1")
+			return err
+		}
 	}
 
 	if s.ConnChannel != nil {
-		s.ConnChannel.Close()
+		err := s.ConnChannel.Close()
+		if err != nil && !errors.Is(err, io.EOF) {
+			fmt.Println("2")
+			return err
+		}
 	}
 
 	if s.Connection != nil {
-		s.Connection.Close()
+		err := s.Connection.Close()
+		if err != nil && !errors.Is(err, net.ErrClosed) {
+			fmt.Println("3")
+
+			return err
+		}
 	}
 
 	if s.Slug != "" {
@@ -101,10 +114,15 @@ func (s *Session) Close() {
 	}
 
 	if s.TunnelType == TCP {
-		portUtil.Manager.SetPortStatus(s.ForwardedPort, false)
+		err := portUtil.Manager.SetPortStatus(s.ForwardedPort, false)
+		if err != nil {
+			fmt.Println("4")
+			return err
+		}
 	}
 
 	s.safeClose()
+	return nil
 }
 
 func (s *Session) HandleGlobalRequest(GlobalRequest <-chan *ssh.Request) {
@@ -542,7 +560,6 @@ func (s *Session) HandleForwardedConnection(conn UserConnection, sshConn *ssh.Se
 	}
 	defer channel.Close()
 
-	// Goroutine 1: Handle SSH channel requests (same as old code)
 	go func() {
 		defer func() {
 			if r := recover(); r != nil {
@@ -570,7 +587,7 @@ func (s *Session) HandleForwardedConnection(conn UserConnection, sshConn *ssh.Se
 		}()
 
 		_, err := io.Copy(channel, conn.Reader)
-		if err != nil && !errors.Is(err, io.EOF) {
+		if err != nil && !errors.Is(err, io.EOF) && !errors.Is(err, net.ErrClosed) {
 			log.Printf("Error copying from conn.Reader to channel: %v", err)
 		}
 		cancel()