frp/client/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.
package client
import (
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"bytes"
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"fmt"
"io"
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"net"
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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"
"github.com/fatedier/frp/models/plugin"
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"github.com/fatedier/frp/models/proto/udp"
"github.com/fatedier/frp/utils/errors"
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frpIo "github.com/fatedier/frp/utils/io"
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"github.com/fatedier/frp/utils/log"
frpNet "github.com/fatedier/frp/utils/net"
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"github.com/fatedier/frp/utils/pool"
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)
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// Proxy defines how to deal with 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(conn frpNet.Conn)
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Close()
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log.Logger
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}
func NewProxy(ctl *Control, pxyConf config.ProxyConf) (pxy Proxy) {
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baseProxy := BaseProxy{
ctl: ctl,
Logger: log.NewPrefixLogger(pxyConf.GetName()),
}
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switch cfg := pxyConf.(type) {
case *config.TcpProxyConf:
pxy = &TcpProxy{
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BaseProxy: baseProxy,
cfg: cfg,
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}
case *config.UdpProxyConf:
pxy = &UdpProxy{
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BaseProxy: baseProxy,
cfg: cfg,
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}
case *config.HttpProxyConf:
pxy = &HttpProxy{
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BaseProxy: baseProxy,
cfg: cfg,
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}
case *config.HttpsProxyConf:
pxy = &HttpsProxy{
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BaseProxy: baseProxy,
cfg: cfg,
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}
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case *config.StcpProxyConf:
pxy = &StcpProxy{
BaseProxy: baseProxy,
cfg: cfg,
}
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case *config.XtcpProxyConf:
pxy = &XtcpProxy{
BaseProxy: baseProxy,
cfg: cfg,
}
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}
return
}
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type BaseProxy struct {
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ctl *Control
closed bool
mu sync.RWMutex
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log.Logger
}
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// TCP
type TcpProxy struct {
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BaseProxy
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 frpNet.Conn) {
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HandleTcpWorkConnection(&pxy.cfg.LocalSvrConf, pxy.proxyPlugin, &pxy.cfg.BaseProxyConf, conn,
[]byte(config.ClientCommonCfg.PrivilegeToken))
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}
// HTTP
type HttpProxy struct {
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BaseProxy
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 frpNet.Conn) {
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HandleTcpWorkConnection(&pxy.cfg.LocalSvrConf, pxy.proxyPlugin, &pxy.cfg.BaseProxyConf, conn,
[]byte(config.ClientCommonCfg.PrivilegeToken))
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}
// HTTPS
type HttpsProxy struct {
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BaseProxy
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 frpNet.Conn) {
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HandleTcpWorkConnection(&pxy.cfg.LocalSvrConf, pxy.proxyPlugin, &pxy.cfg.BaseProxyConf, conn,
[]byte(config.ClientCommonCfg.PrivilegeToken))
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}
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// STCP
type StcpProxy struct {
BaseProxy
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()
}
}
func (pxy *StcpProxy) InWorkConn(conn frpNet.Conn) {
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HandleTcpWorkConnection(&pxy.cfg.LocalSvrConf, pxy.proxyPlugin, &pxy.cfg.BaseProxyConf, conn,
[]byte(config.ClientCommonCfg.PrivilegeToken))
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}
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// XTCP
type XtcpProxy struct {
BaseProxy
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()
}
}
func (pxy *XtcpProxy) InWorkConn(conn frpNet.Conn) {
defer conn.Close()
var natHoleSidMsg msg.NatHoleSid
err := msg.ReadMsgInto(conn, &natHoleSidMsg)
if err != nil {
pxy.Error("xtcp read from workConn error: %v", err)
return
}
natHoleClientMsg := &msg.NatHoleClient{
ProxyName: pxy.cfg.ProxyName,
Sid: natHoleSidMsg.Sid,
}
raddr, _ := net.ResolveUDPAddr("udp",
fmt.Sprintf("%s:%d", config.ClientCommonCfg.ServerAddr, config.ClientCommonCfg.ServerUdpPort))
clientConn, err := net.DialUDP("udp", nil, raddr)
defer clientConn.Close()
err = msg.WriteMsg(clientConn, natHoleClientMsg)
if err != nil {
pxy.Error("send natHoleClientMsg to server error: %v", err)
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 {
pxy.Error("get natHoleRespMsg error: %v", err)
return
}
err = msg.ReadMsgInto(bytes.NewReader(buf[:n]), &natHoleRespMsg)
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if err != nil {
pxy.Error("get natHoleRespMsg error: %v", err)
return
}
clientConn.SetReadDeadline(time.Time{})
clientConn.Close()
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pxy.Trace("get natHoleRespMsg, sid [%s], client address [%s]", natHoleRespMsg.Sid, natHoleRespMsg.ClientAddr)
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// Send sid to visitor udp address.
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time.Sleep(time.Second)
laddr, _ := net.ResolveUDPAddr("udp", clientConn.LocalAddr().String())
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daddr, err := net.ResolveUDPAddr("udp", natHoleRespMsg.VisitorAddr)
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if err != nil {
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pxy.Error("resolve visitor udp address error: %v", err)
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return
}
lConn, err := net.DialUDP("udp", laddr, daddr)
if err != nil {
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pxy.Error("dial visitor udp address error: %v", err)
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return
}
lConn.Write([]byte(natHoleRespMsg.Sid))
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kcpConn, err := frpNet.NewKcpConnFromUdp(lConn, true, natHoleRespMsg.VisitorAddr)
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if err != nil {
pxy.Error("create kcp connection from udp connection error: %v", err)
return
}
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HandleTcpWorkConnection(&pxy.cfg.LocalSvrConf, pxy.proxyPlugin, &pxy.cfg.BaseProxyConf,
frpNet.WrapConn(kcpConn), []byte(pxy.cfg.Sk))
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}
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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
workConn frpNet.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 frpNet.Conn) {
pxy.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()
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 {
pxy.Warn("read from workConn for udp error: %v", errRet)
return
}
if errRet := errors.PanicToError(func() {
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pxy.Trace("get udp package from workConn: %s", udpMsg.Content)
readCh <- &udpMsg
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}); errRet != nil {
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pxy.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() {
pxy.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:
pxy.Trace("send udp package to workConn: %s", m.Content)
case *msg.Ping:
pxy.Trace("send ping message to udp workConn")
}
if errRet = msg.WriteMsg(conn, rawMsg); errRet != nil {
pxy.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 {
pxy.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.
func HandleTcpWorkConnection(localInfo *config.LocalSvrConf, proxyPlugin plugin.Plugin,
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baseInfo *config.BaseProxyConf, workConn frpNet.Conn, encKey []byte) {
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var (
remote io.ReadWriteCloser
err error
)
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remote = workConn
if baseInfo.UseEncryption {
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remote, err = frpIo.WithEncryption(remote, encKey)
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if err != nil {
workConn.Error("create encryption stream error: %v", err)
return
}
}
if baseInfo.UseCompression {
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remote = frpIo.WithCompression(remote)
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}
if proxyPlugin != nil {
// if plugin is set, let plugin handle connections first
workConn.Debug("handle by plugin: %s", proxyPlugin.Name())
proxyPlugin.Handle(remote)
workConn.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 {
workConn.Error("connect to local service [%s:%d] error: %v", localInfo.LocalIp, localInfo.LocalPort, err)
return
}
workConn.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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frpIo.Join(localConn, remote)
workConn.Debug("join connections closed")
}
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}