mirror of
https://github.com/fatedier/frp.git
synced 2024-12-12 17:50:51 +01:00
265 lines
6.5 KiB
Go
265 lines
6.5 KiB
Go
// Copyright 2017 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 visitor
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import (
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"fmt"
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"io"
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"net"
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"strconv"
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"sync"
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"time"
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"github.com/fatedier/golib/errors"
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libio "github.com/fatedier/golib/io"
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v1 "github.com/fatedier/frp/pkg/config/v1"
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"github.com/fatedier/frp/pkg/msg"
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"github.com/fatedier/frp/pkg/proto/udp"
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netpkg "github.com/fatedier/frp/pkg/util/net"
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"github.com/fatedier/frp/pkg/util/util"
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"github.com/fatedier/frp/pkg/util/xlog"
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)
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type SUDPVisitor struct {
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*BaseVisitor
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checkCloseCh chan struct{}
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// udpConn is the listener of udp packet
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udpConn *net.UDPConn
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readCh chan *msg.UDPPacket
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sendCh chan *msg.UDPPacket
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cfg *v1.SUDPVisitorConfig
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}
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// SUDP Run start listen a udp port
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func (sv *SUDPVisitor) Run() (err error) {
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xl := xlog.FromContextSafe(sv.ctx)
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addr, err := net.ResolveUDPAddr("udp", net.JoinHostPort(sv.cfg.BindAddr, strconv.Itoa(sv.cfg.BindPort)))
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if err != nil {
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return fmt.Errorf("sudp ResolveUDPAddr error: %v", err)
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}
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sv.udpConn, err = net.ListenUDP("udp", addr)
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if err != nil {
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return fmt.Errorf("listen udp port %s error: %v", addr.String(), err)
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}
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sv.sendCh = make(chan *msg.UDPPacket, 1024)
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sv.readCh = make(chan *msg.UDPPacket, 1024)
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xl.Infof("sudp start to work, listen on %s", addr)
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go sv.dispatcher()
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go udp.ForwardUserConn(sv.udpConn, sv.readCh, sv.sendCh, int(sv.clientCfg.UDPPacketSize))
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return
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}
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func (sv *SUDPVisitor) dispatcher() {
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xl := xlog.FromContextSafe(sv.ctx)
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var (
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visitorConn net.Conn
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err error
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firstPacket *msg.UDPPacket
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)
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for {
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select {
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case firstPacket = <-sv.sendCh:
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if firstPacket == nil {
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xl.Infof("frpc sudp visitor proxy is closed")
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return
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}
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case <-sv.checkCloseCh:
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xl.Infof("frpc sudp visitor proxy is closed")
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return
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}
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visitorConn, err = sv.getNewVisitorConn()
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if err != nil {
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xl.Warnf("newVisitorConn to frps error: %v, try to reconnect", err)
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continue
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}
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// visitorConn always be closed when worker done.
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sv.worker(visitorConn, firstPacket)
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select {
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case <-sv.checkCloseCh:
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return
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default:
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}
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}
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}
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func (sv *SUDPVisitor) worker(workConn net.Conn, firstPacket *msg.UDPPacket) {
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xl := xlog.FromContextSafe(sv.ctx)
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xl.Debugf("starting sudp proxy worker")
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wg := &sync.WaitGroup{}
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wg.Add(2)
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closeCh := make(chan struct{})
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// udp service -> frpc -> frps -> frpc visitor -> user
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workConnReaderFn := func(conn net.Conn) {
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defer func() {
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conn.Close()
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close(closeCh)
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wg.Done()
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}()
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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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// frpc will send heartbeat in workConn to frpc visitor for keeping alive
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_ = conn.SetReadDeadline(time.Now().Add(60 * time.Second))
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if rawMsg, errRet = msg.ReadMsg(conn); errRet != nil {
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xl.Warnf("read from workconn for user udp conn error: %v", errRet)
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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.Debugf("frpc visitor get ping message from frpc")
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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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sv.readCh <- m
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xl.Tracef("frpc visitor get udp packet from workConn: %s", m.Content)
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}); errRet != nil {
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xl.Infof("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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// udp service <- frpc <- frps <- frpc visitor <- user
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workConnSenderFn := func(conn net.Conn) {
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defer func() {
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conn.Close()
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wg.Done()
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}()
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var errRet error
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if firstPacket != nil {
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if errRet = msg.WriteMsg(conn, firstPacket); errRet != nil {
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xl.Warnf("sender goroutine for udp work connection closed: %v", errRet)
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return
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}
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xl.Tracef("send udp package to workConn: %s", firstPacket.Content)
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}
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for {
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select {
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case udpMsg, ok := <-sv.sendCh:
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if !ok {
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xl.Infof("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.Warnf("sender goroutine for udp work connection closed: %v", errRet)
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return
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}
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xl.Tracef("send udp package to workConn: %s", udpMsg.Content)
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case <-closeCh:
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return
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}
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}
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}
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go workConnReaderFn(workConn)
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go workConnSenderFn(workConn)
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wg.Wait()
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xl.Infof("sudp worker is closed")
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}
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func (sv *SUDPVisitor) getNewVisitorConn() (net.Conn, error) {
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xl := xlog.FromContextSafe(sv.ctx)
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visitorConn, err := sv.helper.ConnectServer()
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if err != nil {
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return nil, fmt.Errorf("frpc connect frps error: %v", err)
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}
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now := time.Now().Unix()
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newVisitorConnMsg := &msg.NewVisitorConn{
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RunID: sv.helper.RunID(),
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ProxyName: sv.cfg.ServerName,
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SignKey: util.GetAuthKey(sv.cfg.SecretKey, now),
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Timestamp: now,
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UseEncryption: sv.cfg.Transport.UseEncryption,
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UseCompression: sv.cfg.Transport.UseCompression,
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}
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err = msg.WriteMsg(visitorConn, newVisitorConnMsg)
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if err != nil {
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return nil, fmt.Errorf("frpc send newVisitorConnMsg to frps error: %v", err)
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}
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var newVisitorConnRespMsg msg.NewVisitorConnResp
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_ = visitorConn.SetReadDeadline(time.Now().Add(10 * time.Second))
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err = msg.ReadMsgInto(visitorConn, &newVisitorConnRespMsg)
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if err != nil {
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return nil, fmt.Errorf("frpc read newVisitorConnRespMsg error: %v", err)
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}
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_ = visitorConn.SetReadDeadline(time.Time{})
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if newVisitorConnRespMsg.Error != "" {
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return nil, fmt.Errorf("start new visitor connection error: %s", newVisitorConnRespMsg.Error)
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}
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var remote io.ReadWriteCloser
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remote = visitorConn
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if sv.cfg.Transport.UseEncryption {
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remote, err = libio.WithEncryption(remote, []byte(sv.cfg.SecretKey))
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if err != nil {
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xl.Errorf("create encryption stream error: %v", err)
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return nil, err
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}
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}
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if sv.cfg.Transport.UseCompression {
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remote = libio.WithCompression(remote)
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}
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return netpkg.WrapReadWriteCloserToConn(remote, visitorConn), nil
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}
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func (sv *SUDPVisitor) Close() {
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sv.mu.Lock()
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defer sv.mu.Unlock()
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select {
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case <-sv.checkCloseCh:
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return
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default:
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close(sv.checkCloseCh)
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}
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sv.BaseVisitor.Close()
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if sv.udpConn != nil {
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sv.udpConn.Close()
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}
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close(sv.readCh)
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close(sv.sendCh)
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}
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