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server.go
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server.go
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package main
import (
"github.com/crabkun/crab/compress"
"github.com/crabkun/crab/config"
"github.com/crabkun/crab/crypto"
log "github.com/sirupsen/logrus"
"net"
"time"
)
var serverConfig *config.ServerConfig
func ServerMain(cfg *config.ServerConfig) {
var err error
serverConfig = cfg
l := log.WithFields(log.Fields{
"master": cfg.Master,
})
ConnectMaster:
c, err := net.Dial("tcp", cfg.Master)
if err != nil {
l.WithError(err).Errorln("dial master failed, reconnecting in 3s")
time.Sleep(time.Second * 3)
goto ConnectMaster
}
// disconnect if not handshake in 3s
c.SetDeadline(time.Now().Add(time.Second * 3))
SendCommand(c, CommandServerHandshake, []byte(cfg.MasterKey))
for {
buf, err := ReadFromSocket(c)
if err != nil {
l.WithError(err).Errorln("read from master failed, reconnecting in 3s")
c.Close()
time.Sleep(time.Second * 3)
goto ConnectMaster
}
code := buf[0]
buf = buf[1:]
switch code {
case ResponseCodeReady:
c.SetDeadline(time.Time{})
// handshake success, starting to register port key
for _, v := range serverConfig.Ports {
SendCommand(c, CommandServerRegisterPortKey, []byte(v.PortKey))
}
case ResponseCodeMasterKeyMismatch:
l.Fatalln("master reported that master key mismatch")
case ResponseCodePortKeyExist, ResponseCodePortKeyRegSuccess:
portKey := string(buf)
pk, ok := cfg.GetPort(portKey)
lf := log.Fields{
"port_key": portKey,
}
if ok {
lf["port_mark"] = pk.Mark
}
if code == ResponseCodePortKeyExist {
l.WithFields(lf).Errorln("failed to register port key because already registered")
} else {
l.WithFields(lf).Infoln("port key register success")
}
case ResponseCodeNewClientComing:
if len(buf) < 4 {
continue
}
portKeyLen := buf[0]
buf = buf[1:]
if portKeyLen == 0 || int(portKeyLen) >= len(buf) {
continue
}
portKey := string(buf[:portKeyLen])
clientGuid := string(buf[portKeyLen:])
portCfg, exist := cfg.GetPort(portKey)
if !exist {
l.WithFields(log.Fields{
"port_key": portKey,
"client_guid": clientGuid,
}).Errorln("master return a non-existent port key")
SendCommand(c, 0x4, append([]byte{RejectCodePortKeyNotExist}, clientGuid...))
continue
}
l.WithFields(log.Fields{
"port_key": portKey,
"client_guid": clientGuid,
"port_mark": portCfg.Mark,
}).Debugln("new client come from master")
go serverHandleNewClient(c, portCfg, clientGuid)
default:
l.WithFields(log.Fields{
"code": int(code),
}).Errorln("master response an unsupported code")
}
}
}
func serverHandleNewClient(master net.Conn, portCfg *config.PortConfig, guid string) {
l := log.WithFields(log.Fields{
"local_addr": portCfg.LocalAddress,
"master": serverConfig.Master,
"client_guid": guid,
"port_mark": portCfg.Mark,
})
remoteConn, err := net.DialTimeout("tcp", portCfg.LocalAddress, time.Second*8)
if err != nil {
l.WithError(err).Errorln("connect to local address failed")
SendCommand(master, CommandServerRejectClientRequest, append([]byte{RejectCodePortKeyRemoteConnectFailed}, []byte(guid)...))
return
}
newMasterConn, err := net.Dial("tcp", serverConfig.Master)
if err != nil {
l.WithError(err).Errorln("callback master failed")
return
}
SendCommand(newMasterConn, CommandServerAcceptClientRequest, []byte(guid))
l.Debugln("client match success")
er, ew, err := crypto.GetCrypto(portCfg.EncryptMethod)
if err != nil {
// because check while validate configure
panic(err)
}
cr, cw, err := compress.GetCompress(portCfg.CompressMethod)
if err != nil {
panic(err)
}
remoteToMaster, err := ew(portCfg.PortKey, newMasterConn)
if err != nil {
l.WithError(err).Errorln("init encrypt failed")
return
}
remoteToMaster, err = cw(remoteToMaster)
if err != nil {
l.WithError(err).Errorln("init compress failed")
return
}
masterToRemote, err := er(portCfg.PortKey, newMasterConn)
if err != nil {
l.WithError(err).Errorln("init decrypt failed")
return
}
masterToRemote, err = cr(masterToRemote)
if err != nil {
l.WithError(err).Errorln("init decompress failed")
return
}
// tcp bridge
go tcpBridge(remoteConn, remoteToMaster)
go tcpBridge(masterToRemote, remoteConn)
}