tcp multiplexing over http connect tunnel

server/proxy/tcpmux.go

@@ -0,0 +1,95 @@
+// Copyright 2020 guylewin, guy@lewin.co.il
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//     http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+package proxy
+
+import (
+	"fmt"
+	"strings"
+
+	"github.com/fatedier/frp/models/config"
+	"github.com/fatedier/frp/models/consts"
+	"github.com/fatedier/frp/utils/util"
+	"github.com/fatedier/frp/utils/vhost"
+)
+
+type TcpMuxProxy struct {
+	*BaseProxy
+	cfg *config.TcpMuxProxyConf
+
+	realPort int
+}
+
+func (pxy *TcpMuxProxy) httpConnectListen(domain string, addrs []string) ([]string, error) {
+	routeConfig := &vhost.VhostRouteConfig{
+		Domain: domain,
+	}
+	l, err := pxy.rc.TcpMuxHttpConnectMuxer.Listen(pxy.ctx, routeConfig)
+	if err != nil {
+		return nil, err
+	}
+	pxy.xl.Info("tcpmux httpconnect multiplexer listens for host [%s]", routeConfig.Domain)
+	pxy.listeners = append(pxy.listeners, l)
+	return append(addrs, util.CanonicalAddr(routeConfig.Domain, pxy.serverCfg.TcpMuxHttpConnectPort)), nil
+}
+
+func (pxy *TcpMuxProxy) httpConnectRun() (remoteAddr string, err error) {
+	addrs := make([]string, 0)
+	for _, domain := range pxy.cfg.CustomDomains {
+		if domain == "" {
+			continue
+		}
+
+		addrs, err = pxy.httpConnectListen(domain, addrs)
+		if err != nil {
+			return "", err
+		}
+	}
+
+	if pxy.cfg.SubDomain != "" {
+		addrs, err = pxy.httpConnectListen(pxy.cfg.SubDomain+"."+pxy.serverCfg.SubDomainHost, addrs)
+		if err != nil {
+			return "", err
+		}
+	}
+
+	pxy.startListenHandler(pxy, HandleUserTcpConnection)
+	remoteAddr = strings.Join(addrs, ",")
+	return remoteAddr, err
+}
+
+func (pxy *TcpMuxProxy) Run() (remoteAddr string, err error) {
+	switch pxy.cfg.Multiplexer {
+	case consts.HttpConnectTcpMultiplexer:
+		remoteAddr, err = pxy.httpConnectRun()
+	default:
+		err = fmt.Errorf("unknown multiplexer [%s]", pxy.cfg.Multiplexer)
+	}
+
+	if err != nil {
+		pxy.Close()
+	}
+	return remoteAddr, err
+}
+
+func (pxy *TcpMuxProxy) GetConf() config.ProxyConf {
+	return pxy.cfg
+}
+
+func (pxy *TcpMuxProxy) Close() {
+	pxy.BaseProxy.Close()
+	if pxy.cfg.Group == "" {
+		pxy.rc.TcpPortManager.Release(pxy.realPort)
+	}
+}