frp/client/visitor/stcp.go

136 lines
3.2 KiB
Go

// Copyright 2017 fatedier, fatedier@gmail.com
//
// 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 visitor
import (
"io"
"net"
"strconv"
"time"
libio "github.com/fatedier/golib/io"
v1 "github.com/fatedier/frp/pkg/config/v1"
"github.com/fatedier/frp/pkg/msg"
"github.com/fatedier/frp/pkg/util/util"
"github.com/fatedier/frp/pkg/util/xlog"
)
type STCPVisitor struct {
*BaseVisitor
cfg *v1.STCPVisitorConfig
}
func (sv *STCPVisitor) Run() (err error) {
if sv.cfg.BindPort > 0 {
sv.l, err = net.Listen("tcp", net.JoinHostPort(sv.cfg.BindAddr, strconv.Itoa(sv.cfg.BindPort)))
if err != nil {
return
}
go sv.worker()
}
go sv.internalConnWorker()
return
}
func (sv *STCPVisitor) Close() {
sv.BaseVisitor.Close()
}
func (sv *STCPVisitor) worker() {
xl := xlog.FromContextSafe(sv.ctx)
for {
conn, err := sv.l.Accept()
if err != nil {
xl.Warnf("stcp local listener closed")
return
}
go sv.handleConn(conn)
}
}
func (sv *STCPVisitor) internalConnWorker() {
xl := xlog.FromContextSafe(sv.ctx)
for {
conn, err := sv.internalLn.Accept()
if err != nil {
xl.Warnf("stcp internal listener closed")
return
}
go sv.handleConn(conn)
}
}
func (sv *STCPVisitor) handleConn(userConn net.Conn) {
xl := xlog.FromContextSafe(sv.ctx)
defer userConn.Close()
xl.Debugf("get a new stcp user connection")
visitorConn, err := sv.helper.ConnectServer()
if err != nil {
return
}
defer visitorConn.Close()
now := time.Now().Unix()
newVisitorConnMsg := &msg.NewVisitorConn{
RunID: sv.helper.RunID(),
ProxyName: sv.cfg.ServerName,
SignKey: util.GetAuthKey(sv.cfg.SecretKey, now),
Timestamp: now,
UseEncryption: sv.cfg.Transport.UseEncryption,
UseCompression: sv.cfg.Transport.UseCompression,
}
err = msg.WriteMsg(visitorConn, newVisitorConnMsg)
if err != nil {
xl.Warnf("send newVisitorConnMsg to server error: %v", err)
return
}
var newVisitorConnRespMsg msg.NewVisitorConnResp
_ = visitorConn.SetReadDeadline(time.Now().Add(10 * time.Second))
err = msg.ReadMsgInto(visitorConn, &newVisitorConnRespMsg)
if err != nil {
xl.Warnf("get newVisitorConnRespMsg error: %v", err)
return
}
_ = visitorConn.SetReadDeadline(time.Time{})
if newVisitorConnRespMsg.Error != "" {
xl.Warnf("start new visitor connection error: %s", newVisitorConnRespMsg.Error)
return
}
var remote io.ReadWriteCloser
remote = visitorConn
if sv.cfg.Transport.UseEncryption {
remote, err = libio.WithEncryption(remote, []byte(sv.cfg.SecretKey))
if err != nil {
xl.Errorf("create encryption stream error: %v", err)
return
}
}
if sv.cfg.Transport.UseCompression {
var recycleFn func()
remote, recycleFn = libio.WithCompressionFromPool(remote)
defer recycleFn()
}
libio.Join(userConn, remote)
}