fix SSH port forwarding

cmd/gost/main.go

@@ -296,8 +296,10 @@ func serve(chain *gost.Chain) error {
 		case "tcp":
 			ln, err = gost.TCPListener(node.Addr)
 		case "rtcp":
+			// Directly use SSH port forwarding if the last chain node is forward+ssh
 			if chain.LastNode().Protocol == "forward" && chain.LastNode().Transport == "ssh" {
 				chain.Nodes()[len(chain.Nodes())-1].Client.Connector = gost.SSHRemoteForwardConnector()
+				chain.Nodes()[len(chain.Nodes())-1].Client.Transporter = gost.SSHForwardTransporter()
 			}
 			ln, err = gost.TCPRemoteForwardListener(node.Addr, chain)
 		case "udp":
@@ -351,6 +353,11 @@ func serve(chain *gost.Chain) error {
 		case "http":
 			handler = gost.HTTPHandler(handlerOptions...)
 		case "tcp":
+			// Directly use SSH port forwarding if the last chain node is forward+ssh
+			if chain.LastNode().Protocol == "forward" && chain.LastNode().Transport == "ssh" {
+				chain.Nodes()[len(chain.Nodes())-1].Client.Connector = gost.SSHDirectForwardConnector()
+				chain.Nodes()[len(chain.Nodes())-1].Client.Transporter = gost.SSHForwardTransporter()
+			}
 			handler = gost.TCPDirectForwardHandler(node.Remote, handlerOptions...)
 		case "rtcp":
 			handler = gost.TCPRemoteForwardHandler(node.Remote, handlerOptions...)