frp/server/service.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 (
"fmt"
"time"
"github.com/fatedier/frp/assets"
"github.com/fatedier/frp/models/config"
"github.com/fatedier/frp/models/msg"
"github.com/fatedier/frp/utils/log"
frpNet "github.com/fatedier/frp/utils/net"
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"github.com/fatedier/frp/utils/util"
"github.com/fatedier/frp/utils/version"
"github.com/fatedier/frp/utils/vhost"
"github.com/xtaci/smux"
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)
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const (
connReadTimeout time.Duration = 10 * time.Second
)
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var ServerService *Service
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// Server service.
type Service struct {
// Accept connections from client.
listener frpNet.Listener
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// For http proxies, route requests to different clients by hostname and other infomation.
VhostHttpMuxer *vhost.HttpMuxer
// For https proxies, route requests to different clients by hostname and other infomation.
VhostHttpsMuxer *vhost.HttpsMuxer
// Manage all controllers.
ctlManager *ControlManager
// Manage all proxies.
pxyManager *ProxyManager
}
func NewService() (svr *Service, err error) {
svr = &Service{
ctlManager: NewControlManager(),
pxyManager: NewProxyManager(),
}
// Init assets.
err = assets.Load(config.ServerCommonCfg.AssetsDir)
if err != nil {
err = fmt.Errorf("Load assets error: %v", err)
return
}
// Listen for accepting connections from client.
svr.listener, err = frpNet.ListenTcp(config.ServerCommonCfg.BindAddr, config.ServerCommonCfg.BindPort)
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if err != nil {
err = fmt.Errorf("Create server listener error, %v", err)
return
}
// Create http vhost muxer.
if config.ServerCommonCfg.VhostHttpPort != 0 {
var l frpNet.Listener
l, err = frpNet.ListenTcp(config.ServerCommonCfg.BindAddr, config.ServerCommonCfg.VhostHttpPort)
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if err != nil {
err = fmt.Errorf("Create vhost http listener error, %v", err)
return
}
svr.VhostHttpMuxer, err = vhost.NewHttpMuxer(l, 30*time.Second)
if err != nil {
err = fmt.Errorf("Create vhost httpMuxer error, %v", err)
return
}
}
// Create https vhost muxer.
if config.ServerCommonCfg.VhostHttpsPort != 0 {
var l frpNet.Listener
l, err = frpNet.ListenTcp(config.ServerCommonCfg.BindAddr, config.ServerCommonCfg.VhostHttpsPort)
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if err != nil {
err = fmt.Errorf("Create vhost https listener error, %v", err)
return
}
svr.VhostHttpsMuxer, err = vhost.NewHttpsMuxer(l, 30*time.Second)
if err != nil {
err = fmt.Errorf("Create vhost httpsMuxer error, %v", err)
return
}
}
// Create dashboard web server.
if config.ServerCommonCfg.DashboardPort != 0 {
err = RunDashboardServer(config.ServerCommonCfg.BindAddr, config.ServerCommonCfg.DashboardPort)
if err != nil {
err = fmt.Errorf("Create dashboard web server error, %v", err)
return
}
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log.Info("Dashboard listen on %s:%d", config.ServerCommonCfg.BindAddr, config.ServerCommonCfg.DashboardPort)
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}
return
}
func (svr *Service) Run() {
// Listen for incoming connections from client.
for {
c, err := svr.listener.Accept()
if err != nil {
log.Warn("Listener for incoming connections from client closed")
return
}
// Start a new goroutine for dealing connections.
go func(frpConn frpNet.Conn) {
dealFn := func(conn frpNet.Conn) {
var rawMsg msg.Message
conn.SetReadDeadline(time.Now().Add(connReadTimeout))
if rawMsg, err = msg.ReadMsg(conn); err != nil {
log.Warn("Failed to read message: %v", err)
conn.Close()
return
}
conn.SetReadDeadline(time.Time{})
switch m := rawMsg.(type) {
case *msg.Login:
err = svr.RegisterControl(conn, m)
// If login failed, send error message there.
// Otherwise send success message in control's work goroutine.
if err != nil {
conn.Warn("%v", err)
msg.WriteMsg(conn, &msg.LoginResp{
Version: version.Full(),
Error: err.Error(),
})
conn.Close()
}
case *msg.NewWorkConn:
svr.RegisterWorkConn(conn, m)
default:
log.Warn("Error message type for the new connection [%s]", conn.RemoteAddr().String())
conn.Close()
}
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}
if config.ServerCommonCfg.TcpMux {
session, err := smux.Server(frpConn, nil)
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if err != nil {
log.Warn("Failed to create mux connection: %v", err)
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frpConn.Close()
return
}
for {
stream, err := session.AcceptStream()
if err != nil {
log.Warn("Accept new mux stream error: %v", err)
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session.Close()
return
}
wrapConn := frpNet.WrapConn(stream)
go dealFn(wrapConn)
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}
} else {
dealFn(frpConn)
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}
}(c)
}
}
func (svr *Service) RegisterControl(ctlConn frpNet.Conn, loginMsg *msg.Login) (err error) {
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ctlConn.Info("client login info: ip [%s] version [%s] hostname [%s] os [%s] arch [%s]",
ctlConn.RemoteAddr().String(), loginMsg.Version, loginMsg.Hostname, loginMsg.Os, loginMsg.Arch)
// Check client version.
if ok, msg := version.Compat(loginMsg.Version); !ok {
err = fmt.Errorf("%s", msg)
return
}
// Check auth.
nowTime := time.Now().Unix()
if config.ServerCommonCfg.AuthTimeout != 0 && nowTime-loginMsg.Timestamp > config.ServerCommonCfg.AuthTimeout {
err = fmt.Errorf("authorization timeout")
return
}
if util.GetAuthKey(config.ServerCommonCfg.PrivilegeToken, loginMsg.Timestamp) != loginMsg.PrivilegeKey {
err = fmt.Errorf("authorization failed")
return
}
// If client's RunId is empty, it's a new client, we just create a new controller.
// Otherwise, we check if there is one controller has the same run id. If so, we release previous controller and start new one.
if loginMsg.RunId == "" {
loginMsg.RunId, err = util.RandId()
if err != nil {
return
}
}
ctl := NewControl(svr, ctlConn, loginMsg)
if oldCtl := svr.ctlManager.Add(loginMsg.RunId, ctl); oldCtl != nil {
oldCtl.allShutdown.WaitDown()
}
ctlConn.AddLogPrefix(loginMsg.RunId)
ctl.Start()
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// for statistics
StatsNewClient()
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return
}
// RegisterWorkConn register a new work connection to control and proxies need it.
func (svr *Service) RegisterWorkConn(workConn frpNet.Conn, newMsg *msg.NewWorkConn) {
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ctl, exist := svr.ctlManager.GetById(newMsg.RunId)
if !exist {
workConn.Warn("No client control found for run id [%s]", newMsg.RunId)
return
}
ctl.RegisterWorkConn(workConn)
return
}
func (svr *Service) RegisterProxy(name string, pxy Proxy) error {
err := svr.pxyManager.Add(name, pxy)
return err
}
func (svr *Service) DelProxy(name string) {
svr.pxyManager.Del(name)
}