frp/server/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 server
import (
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"context"
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"fmt"
"io"
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"net"
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"sync"
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"time"
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"github.com/fatedier/frp/models/config"
"github.com/fatedier/frp/models/msg"
"github.com/fatedier/frp/models/proto/tcp"
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"github.com/fatedier/frp/models/proto/udp"
"github.com/fatedier/frp/utils/errors"
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"github.com/fatedier/frp/utils/log"
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frpNet "github.com/fatedier/frp/utils/net"
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"github.com/fatedier/frp/utils/vhost"
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)
type Proxy interface {
Run() error
GetControl() *Control
GetName() string
GetConf() config.ProxyConf
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GetWorkConnFromPool() (workConn frpNet.Conn, err error)
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Close()
log.Logger
}
type BaseProxy struct {
name string
ctl *Control
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listeners []frpNet.Listener
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mu sync.RWMutex
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log.Logger
}
func (pxy *BaseProxy) GetName() string {
return pxy.name
}
func (pxy *BaseProxy) GetControl() *Control {
return pxy.ctl
}
func (pxy *BaseProxy) Close() {
pxy.Info("proxy closing")
for _, l := range pxy.listeners {
l.Close()
}
}
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func (pxy *BaseProxy) GetWorkConnFromPool() (workConn frpNet.Conn, err error) {
ctl := pxy.GetControl()
// try all connections from the pool
for i := 0; i < ctl.poolCount+1; i++ {
if workConn, err = ctl.GetWorkConn(); err != nil {
pxy.Warn("failed to get work connection: %v", err)
return
}
pxy.Info("get a new work connection: [%s]", workConn.RemoteAddr().String())
workConn.AddLogPrefix(pxy.GetName())
err := msg.WriteMsg(workConn, &msg.StartWorkConn{
ProxyName: pxy.GetName(),
})
if err != nil {
workConn.Warn("failed to send message to work connection from pool: %v, times: %d", err, i)
workConn.Close()
} else {
break
}
}
if err != nil {
pxy.Error("try to get work connection failed in the end")
return
}
return
}
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// startListenHandler start a goroutine handler for each listener.
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// p: p will just be passed to handler(Proxy, frpNet.Conn).
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// handler: each proxy type can set different handler function to deal with connections accepted from listeners.
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func (pxy *BaseProxy) startListenHandler(p Proxy, handler func(Proxy, frpNet.Conn)) {
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for _, listener := range pxy.listeners {
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go func(l frpNet.Listener) {
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for {
// block
// if listener is closed, err returned
c, err := l.Accept()
if err != nil {
pxy.Info("listener is closed")
return
}
pxy.Debug("get a user connection [%s]", c.RemoteAddr().String())
go handler(p, c)
}
}(listener)
}
}
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func NewProxy(ctl *Control, pxyConf config.ProxyConf) (pxy Proxy, err error) {
basePxy := BaseProxy{
name: pxyConf.GetName(),
ctl: ctl,
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listeners: make([]frpNet.Listener, 0),
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Logger: log.NewPrefixLogger(ctl.runId),
}
switch cfg := pxyConf.(type) {
case *config.TcpProxyConf:
pxy = &TcpProxy{
BaseProxy: basePxy,
cfg: cfg,
}
case *config.HttpProxyConf:
pxy = &HttpProxy{
BaseProxy: basePxy,
cfg: cfg,
}
case *config.HttpsProxyConf:
pxy = &HttpsProxy{
BaseProxy: basePxy,
cfg: cfg,
}
case *config.UdpProxyConf:
pxy = &UdpProxy{
BaseProxy: basePxy,
cfg: cfg,
}
default:
return pxy, fmt.Errorf("proxy type not support")
}
pxy.AddLogPrefix(pxy.GetName())
return
}
type TcpProxy struct {
BaseProxy
cfg *config.TcpProxyConf
}
func (pxy *TcpProxy) Run() error {
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listener, err := frpNet.ListenTcp(config.ServerCommonCfg.BindAddr, pxy.cfg.RemotePort)
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if err != nil {
return err
}
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listener.AddLogPrefix(pxy.name)
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pxy.listeners = append(pxy.listeners, listener)
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pxy.Info("tcp proxy listen port [%d]", pxy.cfg.RemotePort)
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pxy.startListenHandler(pxy, HandleUserTcpConnection)
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return nil
}
func (pxy *TcpProxy) GetConf() config.ProxyConf {
return pxy.cfg
}
func (pxy *TcpProxy) Close() {
pxy.BaseProxy.Close()
}
type HttpProxy struct {
BaseProxy
cfg *config.HttpProxyConf
}
func (pxy *HttpProxy) Run() (err error) {
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routeConfig := &vhost.VhostRouteConfig{
RewriteHost: pxy.cfg.HostHeaderRewrite,
Username: pxy.cfg.HttpUser,
Password: pxy.cfg.HttpPwd,
}
locations := pxy.cfg.Locations
if len(locations) == 0 {
locations = []string{""}
}
for _, domain := range pxy.cfg.CustomDomains {
routeConfig.Domain = domain
for _, location := range locations {
routeConfig.Location = location
l, err := pxy.ctl.svr.VhostHttpMuxer.Listen(routeConfig)
if err != nil {
return err
}
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l.AddLogPrefix(pxy.name)
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pxy.Info("http proxy listen for host [%s] location [%s]", routeConfig.Domain, routeConfig.Location)
pxy.listeners = append(pxy.listeners, l)
}
}
if pxy.cfg.SubDomain != "" {
routeConfig.Domain = pxy.cfg.SubDomain + "." + config.ServerCommonCfg.SubDomainHost
for _, location := range locations {
routeConfig.Location = location
l, err := pxy.ctl.svr.VhostHttpMuxer.Listen(routeConfig)
if err != nil {
return err
}
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l.AddLogPrefix(pxy.name)
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pxy.Info("http proxy listen for host [%s] location [%s]", routeConfig.Domain, routeConfig.Location)
pxy.listeners = append(pxy.listeners, l)
}
}
pxy.startListenHandler(pxy, HandleUserTcpConnection)
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return
}
func (pxy *HttpProxy) GetConf() config.ProxyConf {
return pxy.cfg
}
func (pxy *HttpProxy) Close() {
pxy.BaseProxy.Close()
}
type HttpsProxy struct {
BaseProxy
cfg *config.HttpsProxyConf
}
func (pxy *HttpsProxy) Run() (err error) {
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routeConfig := &vhost.VhostRouteConfig{}
for _, domain := range pxy.cfg.CustomDomains {
routeConfig.Domain = domain
l, err := pxy.ctl.svr.VhostHttpsMuxer.Listen(routeConfig)
if err != nil {
return err
}
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l.AddLogPrefix(pxy.name)
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pxy.Info("https proxy listen for host [%s]", routeConfig.Domain)
pxy.listeners = append(pxy.listeners, l)
}
if pxy.cfg.SubDomain != "" {
routeConfig.Domain = pxy.cfg.SubDomain + "." + config.ServerCommonCfg.SubDomainHost
l, err := pxy.ctl.svr.VhostHttpsMuxer.Listen(routeConfig)
if err != nil {
return err
}
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l.AddLogPrefix(pxy.name)
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pxy.Info("https proxy listen for host [%s]", routeConfig.Domain)
pxy.listeners = append(pxy.listeners, l)
}
pxy.startListenHandler(pxy, HandleUserTcpConnection)
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return
}
func (pxy *HttpsProxy) GetConf() config.ProxyConf {
return pxy.cfg
}
func (pxy *HttpsProxy) Close() {
pxy.BaseProxy.Close()
}
type UdpProxy struct {
BaseProxy
cfg *config.UdpProxyConf
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// udpConn is the listener of udp packages
udpConn *net.UDPConn
// there are always only one workConn at the same time
// get another one if it closed
workConn net.Conn
// sendCh is used for sending packages to workConn
sendCh chan *msg.UdpPacket
// readCh is used for reading packages from workConn
readCh chan *msg.UdpPacket
// 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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}
func (pxy *UdpProxy) Run() (err error) {
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addr, err := net.ResolveUDPAddr("udp", fmt.Sprintf("%s:%d", config.ServerCommonCfg.BindAddr, pxy.cfg.RemotePort))
if err != nil {
return err
}
udpConn, err := net.ListenUDP("udp", addr)
if err != nil {
pxy.Warn("listen udp port error: %v", err)
return err
}
pxy.Info("udp proxy listen port [%d]", pxy.cfg.RemotePort)
pxy.udpConn = udpConn
pxy.sendCh = make(chan *msg.UdpPacket, 1024)
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) {
for {
var (
rawMsg msg.Message
errRet error
)
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pxy.Trace("loop waiting message from udp workConn")
// client will send heartbeat in workConn for keeping alive
conn.SetReadDeadline(time.Now().Add(time.Duration(60) * time.Second))
if rawMsg, errRet = msg.ReadMsg(conn); errRet != nil {
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pxy.Warn("read from workConn for udp error: %v", errRet)
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() {
pxy.checkCloseCh <- 1
})
return
}
conn.SetReadDeadline(time.Time{})
switch m := rawMsg.(type) {
case *msg.Ping:
pxy.Trace("udp work conn get ping message")
continue
case *msg.UdpPacket:
if errRet := errors.PanicToError(func() {
pxy.Trace("get udp message from workConn: %s", m.Content)
pxy.readCh <- m
StatsAddTrafficOut(pxy.GetName(), int64(len(m.Content)))
}); errRet != nil {
conn.Close()
pxy.Info("reader goroutine for udp work connection closed")
return
}
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}
}
}
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// send message to workConn
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workConnSenderFn := func(conn net.Conn, ctx context.Context) {
var errRet error
for {
select {
case udpMsg, ok := <-pxy.sendCh:
if !ok {
pxy.Info("sender goroutine for udp work connection closed")
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return
}
if errRet = msg.WriteMsg(conn, udpMsg); errRet != nil {
pxy.Info("sender goroutine for udp work connection closed: %v", errRet)
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conn.Close()
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return
} else {
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pxy.Trace("send message to udp workConn: %s", udpMsg.Content)
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StatsAddTrafficIn(pxy.GetName(), int64(len(udpMsg.Content)))
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continue
}
case <-ctx.Done():
pxy.Info("sender goroutine for udp work connection closed")
return
}
}
}
go func() {
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// Sleep a while for waiting control send the NewProxyResp to client.
time.Sleep(500 * time.Millisecond)
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for {
workConn, err := pxy.GetWorkConnFromPool()
if err != nil {
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time.Sleep(1 * time.Second)
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// check if proxy is closed
select {
case _, ok := <-pxy.checkCloseCh:
if !ok {
return
}
default:
}
continue
}
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// close the old workConn and replac it with a new one
if pxy.workConn != nil {
pxy.workConn.Close()
}
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pxy.workConn = workConn
ctx, cancel := context.WithCancel(context.Background())
go workConnReaderFn(workConn)
go workConnSenderFn(workConn, ctx)
_, ok := <-pxy.checkCloseCh
cancel()
if !ok {
return
}
}
}()
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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.
// Close readCh and sendCh at the end.
go func() {
udp.ForwardUserConn(udpConn, pxy.readCh, pxy.sendCh)
pxy.Close()
}()
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return nil
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}
func (pxy *UdpProxy) GetConf() config.ProxyConf {
return pxy.cfg
}
func (pxy *UdpProxy) Close() {
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pxy.mu.Lock()
defer pxy.mu.Unlock()
if !pxy.isClosed {
pxy.isClosed = true
pxy.BaseProxy.Close()
pxy.workConn.Close()
pxy.udpConn.Close()
// all channels only closed here
close(pxy.checkCloseCh)
close(pxy.readCh)
close(pxy.sendCh)
}
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}
// HandleUserTcpConnection is used for incoming tcp user connections.
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// It can be used for tcp, http, https type.
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func HandleUserTcpConnection(pxy Proxy, userConn frpNet.Conn) {
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defer userConn.Close()
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// try all connections from the pool
workConn, err := pxy.GetWorkConnFromPool()
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if err != nil {
return
}
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defer workConn.Close()
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var local io.ReadWriteCloser = workConn
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cfg := pxy.GetConf().GetBaseInfo()
if cfg.UseEncryption {
local, err = tcp.WithEncryption(local, []byte(config.ServerCommonCfg.PrivilegeToken))
if err != nil {
pxy.Error("create encryption stream error: %v", err)
return
}
}
if cfg.UseCompression {
local = tcp.WithCompression(local)
}
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pxy.Debug("join connections, workConn(l[%s] r[%s]) userConn(l[%s] r[%s])", workConn.LocalAddr().String(),
workConn.RemoteAddr().String(), userConn.LocalAddr().String(), userConn.RemoteAddr().String())
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StatsOpenConnection(pxy.GetName())
inCount, outCount := tcp.Join(local, userConn)
StatsCloseConnection(pxy.GetName())
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StatsAddTrafficIn(pxy.GetName(), inCount)
StatsAddTrafficOut(pxy.GetName(), outCount)
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pxy.Debug("join connections closed")
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}