frp/client/proxy/proxy.go

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// 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.
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package proxy
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import (
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"bytes"
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"context"
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"fmt"
"io"
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"io/ioutil"
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"net"
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"strconv"
"strings"
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"sync"
"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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plugin "github.com/fatedier/frp/models/plugin/client"
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"github.com/fatedier/frp/models/proto/udp"
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"github.com/fatedier/frp/utils/limit"
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frpNet "github.com/fatedier/frp/utils/net"
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"github.com/fatedier/frp/utils/xlog"
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"github.com/fatedier/golib/errors"
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frpIo "github.com/fatedier/golib/io"
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"github.com/fatedier/golib/pool"
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fmux "github.com/hashicorp/yamux"
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pp "github.com/pires/go-proxyproto"
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"golang.org/x/time/rate"
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)
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// Proxy defines how to handle work connections for different proxy type.
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type Proxy interface {
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Run() error
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// InWorkConn accept work connections registered to server.
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InWorkConn(net.Conn, *msg.StartWorkConn)
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Close()
}
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func NewProxy(ctx context.Context, pxyConf config.ProxyConf, clientCfg config.ClientCommonConf, serverUDPPort int) (pxy Proxy) {
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var limiter *rate.Limiter
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limitBytes := pxyConf.GetBaseInfo().BandwidthLimit.Bytes()
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if limitBytes > 0 {
limiter = rate.NewLimiter(rate.Limit(float64(limitBytes)), int(limitBytes))
}
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baseProxy := BaseProxy{
clientCfg: clientCfg,
serverUDPPort: serverUDPPort,
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limiter: limiter,
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xl: xlog.FromContextSafe(ctx),
ctx: ctx,
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}
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switch cfg := pxyConf.(type) {
case *config.TcpProxyConf:
pxy = &TcpProxy{
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BaseProxy: &baseProxy,
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cfg: cfg,
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}
case *config.UdpProxyConf:
pxy = &UdpProxy{
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BaseProxy: &baseProxy,
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cfg: cfg,
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}
case *config.HttpProxyConf:
pxy = &HttpProxy{
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BaseProxy: &baseProxy,
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cfg: cfg,
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}
case *config.HttpsProxyConf:
pxy = &HttpsProxy{
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BaseProxy: &baseProxy,
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cfg: cfg,
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}
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case *config.StcpProxyConf:
pxy = &StcpProxy{
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BaseProxy: &baseProxy,
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cfg: cfg,
}
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case *config.XtcpProxyConf:
pxy = &XtcpProxy{
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BaseProxy: &baseProxy,
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cfg: cfg,
}
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}
return
}
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type BaseProxy struct {
closed bool
clientCfg config.ClientCommonConf
serverUDPPort int
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limiter *rate.Limiter
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mu sync.RWMutex
xl *xlog.Logger
ctx context.Context
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}
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// TCP
type TcpProxy struct {
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*BaseProxy
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cfg *config.TcpProxyConf
proxyPlugin plugin.Plugin
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}
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func (pxy *TcpProxy) Run() (err error) {
if pxy.cfg.Plugin != "" {
pxy.proxyPlugin, err = plugin.Create(pxy.cfg.Plugin, pxy.cfg.PluginParams)
if err != nil {
return
}
}
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return
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}
func (pxy *TcpProxy) Close() {
if pxy.proxyPlugin != nil {
pxy.proxyPlugin.Close()
}
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}
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func (pxy *TcpProxy) InWorkConn(conn net.Conn, m *msg.StartWorkConn) {
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HandleTcpWorkConnection(pxy.ctx, &pxy.cfg.LocalSvrConf, pxy.proxyPlugin, &pxy.cfg.BaseProxyConf, pxy.limiter,
conn, []byte(pxy.clientCfg.Token), m)
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}
// HTTP
type HttpProxy struct {
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*BaseProxy
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cfg *config.HttpProxyConf
proxyPlugin plugin.Plugin
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}
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func (pxy *HttpProxy) Run() (err error) {
if pxy.cfg.Plugin != "" {
pxy.proxyPlugin, err = plugin.Create(pxy.cfg.Plugin, pxy.cfg.PluginParams)
if err != nil {
return
}
}
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return
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}
func (pxy *HttpProxy) Close() {
if pxy.proxyPlugin != nil {
pxy.proxyPlugin.Close()
}
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}
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func (pxy *HttpProxy) InWorkConn(conn net.Conn, m *msg.StartWorkConn) {
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HandleTcpWorkConnection(pxy.ctx, &pxy.cfg.LocalSvrConf, pxy.proxyPlugin, &pxy.cfg.BaseProxyConf, pxy.limiter,
conn, []byte(pxy.clientCfg.Token), m)
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}
// HTTPS
type HttpsProxy struct {
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*BaseProxy
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cfg *config.HttpsProxyConf
proxyPlugin plugin.Plugin
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}
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func (pxy *HttpsProxy) Run() (err error) {
if pxy.cfg.Plugin != "" {
pxy.proxyPlugin, err = plugin.Create(pxy.cfg.Plugin, pxy.cfg.PluginParams)
if err != nil {
return
}
}
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return
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}
func (pxy *HttpsProxy) Close() {
if pxy.proxyPlugin != nil {
pxy.proxyPlugin.Close()
}
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}
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func (pxy *HttpsProxy) InWorkConn(conn net.Conn, m *msg.StartWorkConn) {
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HandleTcpWorkConnection(pxy.ctx, &pxy.cfg.LocalSvrConf, pxy.proxyPlugin, &pxy.cfg.BaseProxyConf, pxy.limiter,
conn, []byte(pxy.clientCfg.Token), m)
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}
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// STCP
type StcpProxy struct {
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*BaseProxy
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cfg *config.StcpProxyConf
proxyPlugin plugin.Plugin
}
func (pxy *StcpProxy) Run() (err error) {
if pxy.cfg.Plugin != "" {
pxy.proxyPlugin, err = plugin.Create(pxy.cfg.Plugin, pxy.cfg.PluginParams)
if err != nil {
return
}
}
return
}
func (pxy *StcpProxy) Close() {
if pxy.proxyPlugin != nil {
pxy.proxyPlugin.Close()
}
}
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func (pxy *StcpProxy) InWorkConn(conn net.Conn, m *msg.StartWorkConn) {
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HandleTcpWorkConnection(pxy.ctx, &pxy.cfg.LocalSvrConf, pxy.proxyPlugin, &pxy.cfg.BaseProxyConf, pxy.limiter,
conn, []byte(pxy.clientCfg.Token), m)
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}
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// XTCP
type XtcpProxy struct {
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*BaseProxy
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cfg *config.XtcpProxyConf
proxyPlugin plugin.Plugin
}
func (pxy *XtcpProxy) Run() (err error) {
if pxy.cfg.Plugin != "" {
pxy.proxyPlugin, err = plugin.Create(pxy.cfg.Plugin, pxy.cfg.PluginParams)
if err != nil {
return
}
}
return
}
func (pxy *XtcpProxy) Close() {
if pxy.proxyPlugin != nil {
pxy.proxyPlugin.Close()
}
}
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func (pxy *XtcpProxy) InWorkConn(conn net.Conn, m *msg.StartWorkConn) {
xl := pxy.xl
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defer conn.Close()
var natHoleSidMsg msg.NatHoleSid
err := msg.ReadMsgInto(conn, &natHoleSidMsg)
if err != nil {
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xl.Error("xtcp read from workConn error: %v", err)
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return
}
natHoleClientMsg := &msg.NatHoleClient{
ProxyName: pxy.cfg.ProxyName,
Sid: natHoleSidMsg.Sid,
}
raddr, _ := net.ResolveUDPAddr("udp",
fmt.Sprintf("%s:%d", pxy.clientCfg.ServerAddr, pxy.serverUDPPort))
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clientConn, err := net.DialUDP("udp", nil, raddr)
defer clientConn.Close()
err = msg.WriteMsg(clientConn, natHoleClientMsg)
if err != nil {
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xl.Error("send natHoleClientMsg to server error: %v", err)
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return
}
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// Wait for client address at most 5 seconds.
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var natHoleRespMsg msg.NatHoleResp
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clientConn.SetReadDeadline(time.Now().Add(5 * time.Second))
buf := pool.GetBuf(1024)
n, err := clientConn.Read(buf)
if err != nil {
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xl.Error("get natHoleRespMsg error: %v", err)
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return
}
err = msg.ReadMsgInto(bytes.NewReader(buf[:n]), &natHoleRespMsg)
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if err != nil {
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xl.Error("get natHoleRespMsg error: %v", err)
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return
}
clientConn.SetReadDeadline(time.Time{})
clientConn.Close()
if natHoleRespMsg.Error != "" {
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xl.Error("natHoleRespMsg get error info: %s", natHoleRespMsg.Error)
return
}
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xl.Trace("get natHoleRespMsg, sid [%s], client address [%s] visitor address [%s]", natHoleRespMsg.Sid, natHoleRespMsg.ClientAddr, natHoleRespMsg.VisitorAddr)
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// Send detect message
array := strings.Split(natHoleRespMsg.VisitorAddr, ":")
if len(array) <= 1 {
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xl.Error("get NatHoleResp visitor address error: %v", natHoleRespMsg.VisitorAddr)
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}
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laddr, _ := net.ResolveUDPAddr("udp", clientConn.LocalAddr().String())
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/*
for i := 1000; i < 65000; i++ {
pxy.sendDetectMsg(array[0], int64(i), laddr, "a")
}
*/
port, err := strconv.ParseInt(array[1], 10, 64)
if err != nil {
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xl.Error("get natHoleResp visitor address error: %v", natHoleRespMsg.VisitorAddr)
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return
}
pxy.sendDetectMsg(array[0], int(port), laddr, []byte(natHoleRespMsg.Sid))
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xl.Trace("send all detect msg done")
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msg.WriteMsg(conn, &msg.NatHoleClientDetectOK{})
// Listen for clientConn's address and wait for visitor connection
lConn, err := net.ListenUDP("udp", laddr)
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if err != nil {
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xl.Error("listen on visitorConn's local adress error: %v", err)
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return
}
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defer lConn.Close()
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lConn.SetReadDeadline(time.Now().Add(8 * time.Second))
sidBuf := pool.GetBuf(1024)
var uAddr *net.UDPAddr
n, uAddr, err = lConn.ReadFromUDP(sidBuf)
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if err != nil {
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xl.Warn("get sid from visitor error: %v", err)
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return
}
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lConn.SetReadDeadline(time.Time{})
if string(sidBuf[:n]) != natHoleRespMsg.Sid {
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xl.Warn("incorrect sid from visitor")
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return
}
pool.PutBuf(sidBuf)
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xl.Info("nat hole connection make success, sid [%s]", natHoleRespMsg.Sid)
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lConn.WriteToUDP(sidBuf[:n], uAddr)
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kcpConn, err := frpNet.NewKcpConnFromUdp(lConn, false, uAddr.String())
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if err != nil {
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xl.Error("create kcp connection from udp connection error: %v", err)
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return
}
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fmuxCfg := fmux.DefaultConfig()
fmuxCfg.KeepAliveInterval = 5 * time.Second
fmuxCfg.LogOutput = ioutil.Discard
sess, err := fmux.Server(kcpConn, fmuxCfg)
if err != nil {
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xl.Error("create yamux server from kcp connection error: %v", err)
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return
}
defer sess.Close()
muxConn, err := sess.Accept()
if err != nil {
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xl.Error("accept for yamux connection error: %v", err)
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return
}
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HandleTcpWorkConnection(pxy.ctx, &pxy.cfg.LocalSvrConf, pxy.proxyPlugin, &pxy.cfg.BaseProxyConf, pxy.limiter,
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muxConn, []byte(pxy.cfg.Sk), m)
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}
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func (pxy *XtcpProxy) sendDetectMsg(addr string, port int, laddr *net.UDPAddr, content []byte) (err error) {
daddr, err := net.ResolveUDPAddr("udp", fmt.Sprintf("%s:%d", addr, port))
if err != nil {
return err
}
tConn, err := net.DialUDP("udp", laddr, daddr)
if err != nil {
return err
}
//uConn := ipv4.NewConn(tConn)
//uConn.SetTTL(3)
tConn.Write(content)
tConn.Close()
return nil
}
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// UDP
type UdpProxy struct {
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*BaseProxy
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cfg *config.UdpProxyConf
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localAddr *net.UDPAddr
readCh chan *msg.UdpPacket
// include msg.UdpPacket and msg.Ping
sendCh chan msg.Message
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workConn net.Conn
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}
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func (pxy *UdpProxy) Run() (err error) {
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pxy.localAddr, err = net.ResolveUDPAddr("udp", fmt.Sprintf("%s:%d", pxy.cfg.LocalIp, pxy.cfg.LocalPort))
if err != nil {
return
}
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return
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}
func (pxy *UdpProxy) Close() {
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pxy.mu.Lock()
defer pxy.mu.Unlock()
if !pxy.closed {
pxy.closed = true
if pxy.workConn != nil {
pxy.workConn.Close()
}
if pxy.readCh != nil {
close(pxy.readCh)
}
if pxy.sendCh != nil {
close(pxy.sendCh)
}
}
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}
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func (pxy *UdpProxy) InWorkConn(conn net.Conn, m *msg.StartWorkConn) {
xl := pxy.xl
xl.Info("incoming a new work connection for udp proxy, %s", conn.RemoteAddr().String())
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// close resources releated with old workConn
pxy.Close()
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if pxy.limiter != nil {
rwc := frpIo.WrapReadWriteCloser(limit.NewReader(conn, pxy.limiter), limit.NewWriter(conn, pxy.limiter), func() error {
return conn.Close()
})
conn = frpNet.WrapReadWriteCloserToConn(rwc, conn)
}
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pxy.mu.Lock()
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pxy.workConn = conn
pxy.readCh = make(chan *msg.UdpPacket, 1024)
pxy.sendCh = make(chan msg.Message, 1024)
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pxy.closed = false
pxy.mu.Unlock()
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workConnReaderFn := func(conn net.Conn, readCh chan *msg.UdpPacket) {
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for {
var udpMsg msg.UdpPacket
if errRet := msg.ReadMsgInto(conn, &udpMsg); errRet != nil {
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xl.Warn("read from workConn for udp error: %v", errRet)
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return
}
if errRet := errors.PanicToError(func() {
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xl.Trace("get udp package from workConn: %s", udpMsg.Content)
readCh <- &udpMsg
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}); errRet != nil {
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xl.Info("reader goroutine for udp work connection closed: %v", errRet)
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return
}
}
}
workConnSenderFn := func(conn net.Conn, sendCh chan msg.Message) {
defer func() {
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xl.Info("writer goroutine for udp work connection closed")
}()
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var errRet error
for rawMsg := range sendCh {
switch m := rawMsg.(type) {
case *msg.UdpPacket:
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xl.Trace("send udp package to workConn: %s", m.Content)
case *msg.Ping:
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xl.Trace("send ping message to udp workConn")
}
if errRet = msg.WriteMsg(conn, rawMsg); errRet != nil {
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xl.Error("udp work write error: %v", errRet)
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return
}
}
}
heartbeatFn := func(conn net.Conn, sendCh chan msg.Message) {
var errRet error
for {
time.Sleep(time.Duration(30) * time.Second)
if errRet = errors.PanicToError(func() {
sendCh <- &msg.Ping{}
}); errRet != nil {
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xl.Trace("heartbeat goroutine for udp work connection closed")
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break
}
}
}
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go workConnSenderFn(pxy.workConn, pxy.sendCh)
go workConnReaderFn(pxy.workConn, pxy.readCh)
go heartbeatFn(pxy.workConn, pxy.sendCh)
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udp.Forwarder(pxy.localAddr, pxy.readCh, pxy.sendCh)
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}
// Common handler for tcp work connections.
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func HandleTcpWorkConnection(ctx context.Context, localInfo *config.LocalSvrConf, proxyPlugin plugin.Plugin,
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baseInfo *config.BaseProxyConf, limiter *rate.Limiter, workConn net.Conn, encKey []byte, m *msg.StartWorkConn) {
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xl := xlog.FromContextSafe(ctx)
var (
remote io.ReadWriteCloser
err error
)
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remote = workConn
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if limiter != nil {
remote = frpIo.WrapReadWriteCloser(limit.NewReader(workConn, limiter), limit.NewWriter(workConn, limiter), func() error {
return workConn.Close()
})
}
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xl.Trace("handle tcp work connection, use_encryption: %t, use_compression: %t",
baseInfo.UseEncryption, baseInfo.UseCompression)
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if baseInfo.UseEncryption {
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remote, err = frpIo.WithEncryption(remote, encKey)
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if err != nil {
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workConn.Close()
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xl.Error("create encryption stream error: %v", err)
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return
}
}
if baseInfo.UseCompression {
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remote = frpIo.WithCompression(remote)
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}
// check if we need to send proxy protocol info
var extraInfo []byte
if baseInfo.ProxyProtocolVersion != "" {
if m.SrcAddr != "" && m.SrcPort != 0 {
if m.DstAddr == "" {
m.DstAddr = "127.0.0.1"
}
h := &pp.Header{
Command: pp.PROXY,
SourceAddress: net.ParseIP(m.SrcAddr),
SourcePort: m.SrcPort,
DestinationAddress: net.ParseIP(m.DstAddr),
DestinationPort: m.DstPort,
}
if strings.Contains(m.SrcAddr, ".") {
h.TransportProtocol = pp.TCPv4
} else {
h.TransportProtocol = pp.TCPv6
}
if baseInfo.ProxyProtocolVersion == "v1" {
h.Version = 1
} else if baseInfo.ProxyProtocolVersion == "v2" {
h.Version = 2
}
buf := bytes.NewBuffer(nil)
h.WriteTo(buf)
extraInfo = buf.Bytes()
}
}
if proxyPlugin != nil {
// if plugin is set, let plugin handle connections first
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xl.Debug("handle by plugin: %s", proxyPlugin.Name())
proxyPlugin.Handle(remote, workConn, extraInfo)
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xl.Debug("handle by plugin finished")
return
} else {
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localConn, err := frpNet.ConnectServer("tcp", fmt.Sprintf("%s:%d", localInfo.LocalIp, localInfo.LocalPort))
if err != nil {
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workConn.Close()
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xl.Error("connect to local service [%s:%d] error: %v", localInfo.LocalIp, localInfo.LocalPort, err)
return
}
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xl.Debug("join connections, localConn(l[%s] r[%s]) workConn(l[%s] r[%s])", localConn.LocalAddr().String(),
localConn.RemoteAddr().String(), workConn.LocalAddr().String(), workConn.RemoteAddr().String())
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if len(extraInfo) > 0 {
localConn.Write(extraInfo)
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}
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frpIo.Join(localConn, remote)
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xl.Debug("join connections closed")
}
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}