forked from snail007/goproxy
/
tunnel_server.go
361 lines (350 loc) · 9.22 KB
/
tunnel_server.go
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package services
import (
"crypto/tls"
"fmt"
"io"
"log"
"net"
"proxy/utils"
"runtime/debug"
"strconv"
"strings"
"time"
)
type TunnelServer struct {
cfg TunnelServerArgs
udpChn chan UDPItem
sc utils.ServerChannel
}
type TunnelServerManager struct {
cfg TunnelServerArgs
udpChn chan UDPItem
sc utils.ServerChannel
serverID string
cm utils.ConnManager
}
func NewTunnelServerManager() Service {
return &TunnelServerManager{
cfg: TunnelServerArgs{},
udpChn: make(chan UDPItem, 50000),
serverID: utils.Uniqueid(),
cm: utils.NewConnManager(),
}
}
func (s *TunnelServerManager) Start(args interface{}) (err error) {
s.cfg = args.(TunnelServerArgs)
s.CheckArgs()
if *s.cfg.Parent != "" {
log.Printf("use tls parent %s", *s.cfg.Parent)
} else {
log.Fatalf("parent required")
}
s.InitService()
log.Printf("server id: %s", s.serverID)
//log.Printf("route:%v", *s.cfg.Route)
for _, _info := range *s.cfg.Route {
IsUDP := *s.cfg.IsUDP
if strings.HasPrefix(_info, "udp://") {
IsUDP = true
}
info := strings.TrimPrefix(_info, "udp://")
info = strings.TrimPrefix(info, "tcp://")
_routeInfo := strings.Split(info, "@")
server := NewTunnelServer()
local := _routeInfo[0]
remote := _routeInfo[1]
KEY := *s.cfg.Key
if strings.HasPrefix(remote, "[") {
KEY = remote[1:strings.LastIndex(remote, "]")]
remote = remote[strings.LastIndex(remote, "]")+1:]
}
if strings.HasPrefix(remote, ":") {
remote = fmt.Sprintf("127.0.0.1%s", remote)
}
err = server.Start(TunnelServerArgs{
CertBytes: s.cfg.CertBytes,
KeyBytes: s.cfg.KeyBytes,
Parent: s.cfg.Parent,
CertFile: s.cfg.CertFile,
KeyFile: s.cfg.KeyFile,
Local: &local,
IsUDP: &IsUDP,
Remote: &remote,
Key: &KEY,
Timeout: s.cfg.Timeout,
Mgr: s,
})
if err != nil {
return
}
}
return
}
func (s *TunnelServerManager) Clean() {
s.StopService()
}
func (s *TunnelServerManager) StopService() {
s.cm.RemoveAll()
}
func (s *TunnelServerManager) CheckArgs() {
if *s.cfg.CertFile == "" || *s.cfg.KeyFile == "" {
log.Fatalf("cert and key file required")
}
s.cfg.CertBytes, s.cfg.KeyBytes = utils.TlsBytes(*s.cfg.CertFile, *s.cfg.KeyFile)
}
func (s *TunnelServerManager) InitService() {
s.InitHeartbeatDeamon()
}
func (s *TunnelServerManager) InitHeartbeatDeamon() {
log.Printf("heartbeat started")
go func() {
var heartbeatConn net.Conn
var ID string
for {
//close all connection
s.cm.Remove(ID)
utils.CloseConn(&heartbeatConn)
heartbeatConn, ID, err := s.GetOutConn(CONN_SERVER_HEARBEAT)
if err != nil {
log.Printf("heartbeat connection err: %s, retrying...", err)
time.Sleep(time.Second * 3)
utils.CloseConn(&heartbeatConn)
continue
}
log.Printf("heartbeat connection created,id:%s", ID)
writeDie := make(chan bool)
readDie := make(chan bool)
go func() {
for {
heartbeatConn.SetWriteDeadline(time.Now().Add(time.Second * 3))
_, err = heartbeatConn.Write([]byte{0x00})
heartbeatConn.SetWriteDeadline(time.Time{})
if err != nil {
log.Printf("heartbeat connection write err %s", err)
break
}
time.Sleep(time.Second * 3)
}
close(writeDie)
}()
go func() {
for {
signal := make([]byte, 1)
heartbeatConn.SetReadDeadline(time.Now().Add(time.Second * 6))
_, err := heartbeatConn.Read(signal)
heartbeatConn.SetReadDeadline(time.Time{})
if err != nil {
log.Printf("heartbeat connection read err: %s", err)
break
} else {
// log.Printf("heartbeat from bridge")
}
}
close(readDie)
}()
select {
case <-readDie:
case <-writeDie:
}
}
}()
}
func (s *TunnelServerManager) GetOutConn(typ uint8) (outConn net.Conn, ID string, err error) {
outConn, err = s.GetConn()
if err != nil {
log.Printf("connection err: %s", err)
return
}
ID = s.serverID
_, err = outConn.Write(utils.BuildPacket(typ, s.serverID))
if err != nil {
log.Printf("write connection data err: %s ,retrying...", err)
utils.CloseConn(&outConn)
return
}
return
}
func (s *TunnelServerManager) GetConn() (conn net.Conn, err error) {
var _conn tls.Conn
_conn, err = utils.TlsConnectHost(*s.cfg.Parent, *s.cfg.Timeout, s.cfg.CertBytes, s.cfg.KeyBytes)
if err == nil {
conn = net.Conn(&_conn)
}
return
}
func NewTunnelServer() Service {
return &TunnelServer{
cfg: TunnelServerArgs{},
udpChn: make(chan UDPItem, 50000),
}
}
type UDPItem struct {
packet *[]byte
localAddr *net.UDPAddr
srcAddr *net.UDPAddr
}
func (s *TunnelServer) InitService() {
s.UDPConnDeamon()
}
func (s *TunnelServer) CheckArgs() {
if *s.cfg.Remote == "" {
log.Fatalf("remote required")
}
}
func (s *TunnelServer) Start(args interface{}) (err error) {
s.cfg = args.(TunnelServerArgs)
s.CheckArgs()
s.InitService()
host, port, _ := net.SplitHostPort(*s.cfg.Local)
p, _ := strconv.Atoi(port)
s.sc = utils.NewServerChannel(host, p)
if *s.cfg.IsUDP {
err = s.sc.ListenUDP(func(packet []byte, localAddr, srcAddr *net.UDPAddr) {
s.udpChn <- UDPItem{
packet: &packet,
localAddr: localAddr,
srcAddr: srcAddr,
}
})
if err != nil {
return
}
log.Printf("proxy on udp tunnel server mode %s", (*s.sc.UDPListener).LocalAddr())
} else {
err = s.sc.ListenTCP(func(inConn net.Conn) {
defer func() {
if err := recover(); err != nil {
log.Printf("tserver conn handler crashed with err : %s \nstack: %s", err, string(debug.Stack()))
}
}()
var outConn net.Conn
var ID string
for {
outConn, ID, err = s.GetOutConn(CONN_SERVER)
if err != nil {
utils.CloseConn(&outConn)
log.Printf("connect to %s fail, err: %s, retrying...", *s.cfg.Parent, err)
time.Sleep(time.Second * 3)
continue
} else {
break
}
}
utils.IoBind(inConn, outConn, func(err interface{}) {
s.cfg.Mgr.cm.RemoveOne(s.cfg.Mgr.serverID, ID)
log.Printf("%s conn %s released", *s.cfg.Key, ID)
})
//add conn
s.cfg.Mgr.cm.Add(s.cfg.Mgr.serverID, ID, &inConn)
log.Printf("%s conn %s created", *s.cfg.Key, ID)
})
if err != nil {
return
}
log.Printf("proxy on tunnel server mode %s", (*s.sc.Listener).Addr())
}
return
}
func (s *TunnelServer) Clean() {
}
func (s *TunnelServer) GetOutConn(typ uint8) (outConn net.Conn, ID string, err error) {
outConn, err = s.GetConn()
if err != nil {
log.Printf("connection err: %s", err)
return
}
remoteAddr := "tcp:" + *s.cfg.Remote
if *s.cfg.IsUDP {
remoteAddr = "udp:" + *s.cfg.Remote
}
ID = utils.Uniqueid()
_, err = outConn.Write(utils.BuildPacket(typ, *s.cfg.Key, ID, remoteAddr, s.cfg.Mgr.serverID))
if err != nil {
log.Printf("write connection data err: %s ,retrying...", err)
utils.CloseConn(&outConn)
return
}
return
}
func (s *TunnelServer) GetConn() (conn net.Conn, err error) {
var _conn tls.Conn
_conn, err = utils.TlsConnectHost(*s.cfg.Parent, *s.cfg.Timeout, s.cfg.CertBytes, s.cfg.KeyBytes)
if err == nil {
conn = net.Conn(&_conn)
}
return
}
func (s *TunnelServer) UDPConnDeamon() {
go func() {
defer func() {
if err := recover(); err != nil {
log.Printf("udp conn deamon crashed with err : %s \nstack: %s", err, string(debug.Stack()))
}
}()
var outConn net.Conn
// var hb utils.HeartbeatReadWriter
var ID string
// var cmdChn = make(chan bool, 1000)
var err error
for {
item := <-s.udpChn
RETRY:
if outConn == nil {
for {
outConn, ID, err = s.GetOutConn(CONN_SERVER)
if err != nil {
// cmdChn <- true
outConn = nil
utils.CloseConn(&outConn)
log.Printf("connect to %s fail, err: %s, retrying...", *s.cfg.Parent, err)
time.Sleep(time.Second * 3)
continue
} else {
go func(outConn net.Conn, ID string) {
go func() {
// <-cmdChn
// outConn.Close()
}()
for {
srcAddrFromConn, body, err := utils.ReadUDPPacket(outConn)
if err == io.EOF || err == io.ErrUnexpectedEOF {
log.Printf("UDP deamon connection %s exited", ID)
break
}
if err != nil {
log.Printf("parse revecived udp packet fail, err: %s ,%v", err, body)
continue
}
//log.Printf("udp packet revecived over parent , local:%s", srcAddrFromConn)
_srcAddr := strings.Split(srcAddrFromConn, ":")
if len(_srcAddr) != 2 {
log.Printf("parse revecived udp packet fail, addr error : %s", srcAddrFromConn)
continue
}
port, _ := strconv.Atoi(_srcAddr[1])
dstAddr := &net.UDPAddr{IP: net.ParseIP(_srcAddr[0]), Port: port}
_, err = s.sc.UDPListener.WriteToUDP(body, dstAddr)
if err != nil {
log.Printf("udp response to local %s fail,ERR:%s", srcAddrFromConn, err)
continue
}
//log.Printf("udp response to local %s success , %v", srcAddrFromConn, body)
}
}(outConn, ID)
break
}
}
}
outConn.SetWriteDeadline(time.Now().Add(time.Second))
_, err = outConn.Write(utils.UDPPacket(item.srcAddr.String(), *item.packet))
outConn.SetWriteDeadline(time.Time{})
if err != nil {
utils.CloseConn(&outConn)
outConn = nil
log.Printf("write udp packet to %s fail ,flush err:%s ,retrying...", *s.cfg.Parent, err)
goto RETRY
}
//log.Printf("write packet %v", *item.packet)
}
}()
}