frp/server/proxy/xtcp.go

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// Copyright 2019 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 proxy
import (
"fmt"
"github.com/fatedier/frp/models/config"
"github.com/fatedier/frp/models/msg"
"github.com/fatedier/golib/errors"
)
type XtcpProxy struct {
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*BaseProxy
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cfg *config.XtcpProxyConf
closeCh chan struct{}
}
func (pxy *XtcpProxy) Run() (remoteAddr string, err error) {
if pxy.rc.NatHoleController == nil {
pxy.Error("udp port for xtcp is not specified.")
err = fmt.Errorf("xtcp is not supported in frps")
return
}
sidCh := pxy.rc.NatHoleController.ListenClient(pxy.GetName(), pxy.cfg.Sk)
go func() {
for {
select {
case <-pxy.closeCh:
break
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case sidRequest := <-sidCh:
sr := sidRequest
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workConn, errRet := pxy.GetWorkConnFromPool()
if errRet != nil {
continue
}
m := &msg.NatHoleSid{
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Sid: sr.Sid,
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}
errRet = msg.WriteMsg(workConn, m)
if errRet != nil {
pxy.Warn("write nat hole sid package error, %v", errRet)
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workConn.Close()
break
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}
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go func() {
raw, errRet := msg.ReadMsg(workConn)
if errRet != nil {
pxy.Warn("read nat hole client ok package error: %v", errRet)
workConn.Close()
return
}
if _, ok := raw.(*msg.NatHoleClientDetectOK); !ok {
pxy.Warn("read nat hole client ok package format error")
workConn.Close()
return
}
select {
case sr.NotifyCh <- struct{}{}:
default:
}
}()
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}
}
}()
return
}
func (pxy *XtcpProxy) GetConf() config.ProxyConf {
return pxy.cfg
}
func (pxy *XtcpProxy) Close() {
pxy.BaseProxy.Close()
pxy.rc.NatHoleController.CloseClient(pxy.GetName())
errors.PanicToError(func() {
close(pxy.closeCh)
})
}