mirror of
https://github.com/fatedier/frp.git
synced 2024-12-14 02:31:21 +01:00
226 lines
5.8 KiB
Go
226 lines
5.8 KiB
Go
// Copyright 2019 fatedier, fatedier@gmail.com
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//
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// Licensed under the Apache License, Version 2.0 (the "License");
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// you may not use this file except in compliance with the License.
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// You may obtain a copy of the License at
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//
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// http://www.apache.org/licenses/LICENSE-2.0
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//
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// Unless required by applicable law or agreed to in writing, software
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// distributed under the License is distributed on an "AS IS" BASIS,
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// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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// See the License for the specific language governing permissions and
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// limitations under the License.
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package proxy
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import (
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"context"
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"fmt"
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"net"
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"time"
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"github.com/fatedier/frp/models/config"
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"github.com/fatedier/frp/models/msg"
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"github.com/fatedier/frp/models/proto/udp"
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"github.com/fatedier/frp/server/stats"
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"github.com/fatedier/golib/errors"
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)
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type UdpProxy struct {
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*BaseProxy
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cfg *config.UdpProxyConf
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realPort int
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// udpConn is the listener of udp packages
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udpConn *net.UDPConn
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// there are always only one workConn at the same time
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// get another one if it closed
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workConn net.Conn
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// sendCh is used for sending packages to workConn
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sendCh chan *msg.UdpPacket
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// readCh is used for reading packages from workConn
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readCh chan *msg.UdpPacket
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// checkCloseCh is used for watching if workConn is closed
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checkCloseCh chan int
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isClosed bool
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}
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func (pxy *UdpProxy) Run() (remoteAddr string, err error) {
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xl := pxy.xl
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pxy.realPort, err = pxy.rc.UdpPortManager.Acquire(pxy.name, pxy.cfg.RemotePort)
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if err != nil {
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return
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}
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defer func() {
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if err != nil {
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pxy.rc.UdpPortManager.Release(pxy.realPort)
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}
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}()
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remoteAddr = fmt.Sprintf(":%d", pxy.realPort)
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pxy.cfg.RemotePort = pxy.realPort
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addr, errRet := net.ResolveUDPAddr("udp", fmt.Sprintf("%s:%d", pxy.serverCfg.ProxyBindAddr, pxy.realPort))
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if errRet != nil {
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err = errRet
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return
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}
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udpConn, errRet := net.ListenUDP("udp", addr)
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if errRet != nil {
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err = errRet
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xl.Warn("listen udp port error: %v", err)
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return
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}
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xl.Info("udp proxy listen port [%d]", pxy.cfg.RemotePort)
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pxy.udpConn = udpConn
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pxy.sendCh = make(chan *msg.UdpPacket, 1024)
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pxy.readCh = make(chan *msg.UdpPacket, 1024)
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pxy.checkCloseCh = make(chan int)
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// read message from workConn, if it returns any error, notify proxy to start a new workConn
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workConnReaderFn := func(conn net.Conn) {
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for {
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var (
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rawMsg msg.Message
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errRet error
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)
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xl.Trace("loop waiting message from udp workConn")
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// client will send heartbeat in workConn for keeping alive
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conn.SetReadDeadline(time.Now().Add(time.Duration(60) * time.Second))
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if rawMsg, errRet = msg.ReadMsg(conn); errRet != nil {
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xl.Warn("read from workConn for udp error: %v", errRet)
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conn.Close()
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// notify proxy to start a new work connection
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// ignore error here, it means the proxy is closed
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errors.PanicToError(func() {
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pxy.checkCloseCh <- 1
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})
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return
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}
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conn.SetReadDeadline(time.Time{})
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switch m := rawMsg.(type) {
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case *msg.Ping:
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xl.Trace("udp work conn get ping message")
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continue
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case *msg.UdpPacket:
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if errRet := errors.PanicToError(func() {
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xl.Trace("get udp message from workConn: %s", m.Content)
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pxy.readCh <- m
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pxy.statsCollector.Mark(stats.TypeAddTrafficOut, &stats.AddTrafficOutPayload{
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ProxyName: pxy.GetName(),
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TrafficBytes: int64(len(m.Content)),
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})
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}); errRet != nil {
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conn.Close()
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xl.Info("reader goroutine for udp work connection closed")
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return
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}
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}
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}
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}
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// send message to workConn
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workConnSenderFn := func(conn net.Conn, ctx context.Context) {
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var errRet error
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for {
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select {
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case udpMsg, ok := <-pxy.sendCh:
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if !ok {
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xl.Info("sender goroutine for udp work connection closed")
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return
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}
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if errRet = msg.WriteMsg(conn, udpMsg); errRet != nil {
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xl.Info("sender goroutine for udp work connection closed: %v", errRet)
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conn.Close()
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return
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} else {
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xl.Trace("send message to udp workConn: %s", udpMsg.Content)
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pxy.statsCollector.Mark(stats.TypeAddTrafficIn, &stats.AddTrafficInPayload{
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ProxyName: pxy.GetName(),
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TrafficBytes: int64(len(udpMsg.Content)),
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})
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continue
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}
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case <-ctx.Done():
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xl.Info("sender goroutine for udp work connection closed")
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return
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}
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}
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}
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go func() {
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// Sleep a while for waiting control send the NewProxyResp to client.
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time.Sleep(500 * time.Millisecond)
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for {
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workConn, err := pxy.GetWorkConnFromPool(nil, nil)
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if err != nil {
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time.Sleep(1 * time.Second)
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// check if proxy is closed
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select {
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case _, ok := <-pxy.checkCloseCh:
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if !ok {
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return
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}
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default:
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}
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continue
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}
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// close the old workConn and replac it with a new one
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if pxy.workConn != nil {
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pxy.workConn.Close()
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}
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pxy.workConn = workConn
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ctx, cancel := context.WithCancel(context.Background())
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go workConnReaderFn(workConn)
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go workConnSenderFn(workConn, ctx)
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_, ok := <-pxy.checkCloseCh
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cancel()
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if !ok {
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return
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}
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}
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}()
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// Read from user connections and send wrapped udp message to sendCh (forwarded by workConn).
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// Client will transfor udp message to local udp service and waiting for response for a while.
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// Response will be wrapped to be forwarded by work connection to server.
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// Close readCh and sendCh at the end.
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go func() {
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udp.ForwardUserConn(udpConn, pxy.readCh, pxy.sendCh)
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pxy.Close()
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}()
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return remoteAddr, nil
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}
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func (pxy *UdpProxy) GetConf() config.ProxyConf {
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return pxy.cfg
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}
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func (pxy *UdpProxy) Close() {
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pxy.mu.Lock()
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defer pxy.mu.Unlock()
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if !pxy.isClosed {
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pxy.isClosed = true
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pxy.BaseProxy.Close()
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if pxy.workConn != nil {
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pxy.workConn.Close()
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}
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pxy.udpConn.Close()
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// all channels only closed here
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close(pxy.checkCloseCh)
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close(pxy.readCh)
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close(pxy.sendCh)
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}
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pxy.rc.UdpPortManager.Release(pxy.realPort)
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}
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