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mux_bridge.go
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mux_bridge.go
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package mux
import (
"bufio"
"fmt"
"io"
logger "log"
"math/rand"
"net"
"runtime/debug"
"strings"
"sync"
"time"
srvtransport "github.com/snail007/proxy/core/cs/server"
"github.com/snail007/proxy/core/lib/kcpcfg"
"github.com/snail007/proxy/services"
"github.com/snail007/proxy/utils"
"github.com/snail007/proxy/utils/mapx"
//"github.com/xtaci/smux"
smux "github.com/hashicorp/yamux"
)
type MuxBridgeArgs struct {
CertFile *string
KeyFile *string
CertBytes []byte
KeyBytes []byte
Local *string
LocalType *string
Timeout *int
IsCompress *bool
KCP kcpcfg.KCPConfigArgs
TCPSMethod *string
TCPSPassword *string
TOUMethod *string
TOUPassword *string
}
type MuxBridge struct {
cfg MuxBridgeArgs
clientControlConns mapx.ConcurrentMap
serverConns mapx.ConcurrentMap
router utils.ClientKeyRouter
l *sync.Mutex
isStop bool
sc *srvtransport.ServerChannel
log *logger.Logger
}
func NewMuxBridge() services.Service {
b := &MuxBridge{
cfg: MuxBridgeArgs{},
clientControlConns: mapx.NewConcurrentMap(),
serverConns: mapx.NewConcurrentMap(),
l: &sync.Mutex{},
isStop: false,
}
b.router = utils.NewClientKeyRouter(&b.clientControlConns, 50000)
return b
}
func (s *MuxBridge) InitService() (err error) {
return
}
func (s *MuxBridge) CheckArgs() (err error) {
if *s.cfg.CertFile == "" || *s.cfg.KeyFile == "" {
err = fmt.Errorf("cert and key file required")
return
}
if *s.cfg.LocalType == "tls" {
s.cfg.CertBytes, s.cfg.KeyBytes, err = utils.TlsBytes(*s.cfg.CertFile, *s.cfg.KeyFile)
if err != nil {
return
}
}
return
}
func (s *MuxBridge) StopService() {
defer func() {
e := recover()
if e != nil {
s.log.Printf("stop bridge service crashed,%s", e)
} else {
s.log.Printf("service bridge stopped")
}
s.cfg = MuxBridgeArgs{}
s.clientControlConns = nil
s.l = nil
s.log = nil
s.router = utils.ClientKeyRouter{}
s.sc = nil
s.serverConns = nil
s = nil
}()
s.isStop = true
if s.sc != nil && (*s.sc).Listener != nil {
(*(*s.sc).Listener).Close()
}
for _, g := range s.clientControlConns.Items() {
for _, session := range g.(*mapx.ConcurrentMap).Items() {
(session.(*smux.Session)).Close()
}
}
for _, c := range s.serverConns.Items() {
(*c.(*net.Conn)).Close()
}
}
func (s *MuxBridge) Start(args interface{}, log *logger.Logger) (err error) {
s.log = log
s.cfg = args.(MuxBridgeArgs)
if err = s.CheckArgs(); err != nil {
return
}
if err = s.InitService(); err != nil {
return
}
sc := srvtransport.NewServerChannelHost(*s.cfg.Local, s.log)
if *s.cfg.LocalType == "tcp" {
err = sc.ListenTCP(s.handler)
} else if *s.cfg.LocalType == "tls" {
err = sc.ListenTLS(s.cfg.CertBytes, s.cfg.KeyBytes, nil, s.handler)
} else if *s.cfg.LocalType == "kcp" {
err = sc.ListenKCP(s.cfg.KCP, s.handler, s.log)
} else if *s.cfg.LocalType == "tcps" {
err = sc.ListenTCPS(*s.cfg.TCPSMethod, *s.cfg.TCPSPassword, false, s.handler)
} else if *s.cfg.LocalType == "tou" {
err = sc.ListenTOU(*s.cfg.TOUMethod, *s.cfg.TOUPassword, false, s.handler)
}
if err != nil {
return
}
s.sc = &sc
if *s.cfg.LocalType == "tou" {
s.log.Printf("%s bridge on %s", *s.cfg.LocalType, sc.UDPListener.LocalAddr())
} else {
s.log.Printf("%s bridge on %s", *s.cfg.LocalType, (*sc.Listener).Addr())
}
return
}
func (s *MuxBridge) Clean() {
s.StopService()
}
func (s *MuxBridge) handler(inConn net.Conn) {
reader := bufio.NewReader(inConn)
var err error
var connType uint8
var key string
inConn.SetDeadline(time.Now().Add(time.Millisecond * time.Duration(*s.cfg.Timeout)))
err = utils.ReadPacket(reader, &connType, &key)
inConn.SetDeadline(time.Time{})
if err != nil {
s.log.Printf("read error,ERR:%s", err)
return
}
switch connType {
case CONN_SERVER:
var serverID string
inAddr := inConn.RemoteAddr().String()
inConn.SetDeadline(time.Now().Add(time.Millisecond * time.Duration(*s.cfg.Timeout)))
err = utils.ReadPacketData(reader, &serverID)
inConn.SetDeadline(time.Time{})
if err != nil {
s.log.Printf("read error,ERR:%s", err)
return
}
s.log.Printf("server connection %s %s connected", serverID, key)
if c, ok := s.serverConns.Get(inAddr); ok {
(*c.(*net.Conn)).Close()
}
s.serverConns.Set(inAddr, &inConn)
session, err := smux.Server(inConn, nil)
if err != nil {
utils.CloseConn(&inConn)
s.log.Printf("server session error,ERR:%s", err)
return
}
for {
if s.isStop {
return
}
stream, err := session.AcceptStream()
if err != nil {
session.Close()
utils.CloseConn(&inConn)
s.serverConns.Remove(inAddr)
s.log.Printf("server connection %s %s released", serverID, key)
return
}
go func() {
defer func() {
if e := recover(); e != nil {
s.log.Printf("bridge callback crashed,err: %s", e)
}
}()
s.callback(stream, serverID, key)
}()
}
case CONN_CLIENT:
s.log.Printf("client connection %s connected", key)
session, err := smux.Client(inConn, nil)
if err != nil {
utils.CloseConn(&inConn)
s.log.Printf("client session error,ERR:%s", err)
return
}
keyInfo := strings.Split(key, "-")
if len(keyInfo) != 2 {
utils.CloseConn(&inConn)
s.log.Printf("client key format error,key:%s", key)
return
}
groupKey := keyInfo[0]
index := keyInfo[1]
s.l.Lock()
defer s.l.Unlock()
var group *mapx.ConcurrentMap
if !s.clientControlConns.Has(groupKey) {
_g := mapx.NewConcurrentMap()
group = &_g
s.clientControlConns.Set(groupKey, group)
//s.log.Printf("init client session group %s", groupKey)
} else {
_group, _ := s.clientControlConns.Get(groupKey)
group = _group.(*mapx.ConcurrentMap)
}
if v, ok := group.Get(index); ok {
v.(*smux.Session).Close()
}
group.Set(index, session)
//s.log.Printf("set client session %s to group %s,grouplen:%d", index, groupKey, group.Count())
go func() {
defer func() {
if e := recover(); e != nil {
fmt.Printf("crashed, err: %s\nstack:%s", e, string(debug.Stack()))
}
}()
for {
if s.isStop {
return
}
if session.IsClosed() {
s.l.Lock()
defer s.l.Unlock()
if sess, ok := group.Get(index); ok && sess.(*smux.Session).IsClosed() {
group.Remove(index)
//s.log.Printf("client session %s removed from group %s, grouplen:%d", key, groupKey, group.Count())
s.log.Printf("client connection %s released", key)
}
if group.IsEmpty() {
s.clientControlConns.Remove(groupKey)
//s.log.Printf("client session group %s removed", groupKey)
}
break
}
time.Sleep(time.Second * 5)
}
}()
//s.log.Printf("set client session,key: %s", key)
}
}
func (s *MuxBridge) callback(inConn net.Conn, serverID, key string) {
try := 20
for {
if s.isStop {
return
}
try--
if try == 0 {
break
}
if key == "*" {
key = s.router.GetKey()
}
//s.log.Printf("server get client session %s", key)
_group, ok := s.clientControlConns.Get(key)
if !ok {
s.log.Printf("client %s session not exists for server stream %s, retrying...", key, serverID)
time.Sleep(time.Second * 3)
continue
}
group := _group.(*mapx.ConcurrentMap)
keys := []string{}
group.IterCb(func(key string, v interface{}) {
keys = append(keys, key)
})
keysLen := len(keys)
//s.log.Printf("client session %s , len:%d , keysLen: %d", key, group.Count(), keysLen)
i := 0
if keysLen > 0 {
i = rand.Intn(keysLen)
} else {
s.log.Printf("client %s session empty for server stream %s, retrying...", key, serverID)
time.Sleep(time.Second * 3)
continue
}
index := keys[i]
s.log.Printf("select client : %s-%s", key, index)
session, _ := group.Get(index)
//session.(*smux.Session).SetDeadline(time.Now().Add(time.Millisecond * time.Duration(*s.cfg.Timeout)))
stream, err := session.(*smux.Session).OpenStream()
//session.(*smux.Session).SetDeadline(time.Time{})
if err != nil {
s.log.Printf("%s client session open stream %s fail, err: %s, retrying...", key, serverID, err)
time.Sleep(time.Second * 3)
continue
} else {
s.log.Printf("stream %s -> %s created", serverID, key)
die1 := make(chan bool, 1)
die2 := make(chan bool, 1)
go func() {
defer func() {
if e := recover(); e != nil {
fmt.Printf("crashed, err: %s\nstack:%s", e, string(debug.Stack()))
}
}()
io.Copy(stream, inConn)
die1 <- true
}()
go func() {
defer func() {
if e := recover(); e != nil {
fmt.Printf("crashed, err: %s\nstack:%s", e, string(debug.Stack()))
}
}()
io.Copy(inConn, stream)
die2 <- true
}()
select {
case <-die1:
case <-die2:
}
stream.Close()
inConn.Close()
s.log.Printf("%s server %s stream released", key, serverID)
break
}
}
}