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 (
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"bytes"
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"context"
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"crypto/tls"
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"fmt"
"io"
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"net"
"net/http"
"sort"
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"strconv"
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"time"
"github.com/fatedier/frp/assets"
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"github.com/fatedier/frp/pkg/auth"
"github.com/fatedier/frp/pkg/config"
modelmetrics "github.com/fatedier/frp/pkg/metrics"
"github.com/fatedier/frp/pkg/msg"
"github.com/fatedier/frp/pkg/nathole"
plugin "github.com/fatedier/frp/pkg/plugin/server"
"github.com/fatedier/frp/pkg/transport"
"github.com/fatedier/frp/pkg/util/log"
frpNet "github.com/fatedier/frp/pkg/util/net"
"github.com/fatedier/frp/pkg/util/tcpmux"
"github.com/fatedier/frp/pkg/util/util"
"github.com/fatedier/frp/pkg/util/version"
"github.com/fatedier/frp/pkg/util/vhost"
"github.com/fatedier/frp/pkg/util/xlog"
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"github.com/fatedier/frp/server/controller"
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"github.com/fatedier/frp/server/group"
"github.com/fatedier/frp/server/metrics"
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"github.com/fatedier/frp/server/ports"
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"github.com/fatedier/frp/server/proxy"
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"github.com/fatedier/frp/server/visitor"
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"github.com/fatedier/golib/net/mux"
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fmux "github.com/hashicorp/yamux"
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)
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const (
connReadTimeout time.Duration = 10 * time.Second
vhostReadWriteTimeout time.Duration = 30 * time.Second
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)
// Server service
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type Service struct {
// Dispatch connections to different handlers listen on same port
muxer *mux.Mux
// Accept connections from client
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listener net.Listener
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// Accept connections using kcp
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kcpListener net.Listener
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// Accept connections using websocket
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websocketListener net.Listener
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// Accept frp tls connections
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tlsListener net.Listener
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// Manage all controllers
ctlManager *ControlManager
// Manage all proxies
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pxyManager *proxy.Manager
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// Manage all plugins
pluginManager *plugin.Manager
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// HTTP vhost router
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httpVhostRouter *vhost.Routers
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// All resource managers and controllers
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rc *controller.ResourceController
// Verifies authentication based on selected method
authVerifier auth.Verifier
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tlsConfig *tls.Config
cfg config.ServerCommonConf
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}
func NewService(cfg config.ServerCommonConf) (svr *Service, err error) {
tlsConfig, err := transport.NewServerTLSConfig(
cfg.TLSCertFile,
cfg.TLSKeyFile,
cfg.TLSTrustedCaFile)
if err != nil {
return
}
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svr = &Service{
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ctlManager: NewControlManager(),
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pxyManager: proxy.NewManager(),
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pluginManager: plugin.NewManager(),
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rc: &controller.ResourceController{
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VisitorManager: visitor.NewManager(),
TCPPortManager: ports.NewManager("tcp", cfg.ProxyBindAddr, cfg.AllowPorts),
UDPPortManager: ports.NewManager("udp", cfg.ProxyBindAddr, cfg.AllowPorts),
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},
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httpVhostRouter: vhost.NewRouters(),
authVerifier: auth.NewAuthVerifier(cfg.ServerConfig),
tlsConfig: tlsConfig,
cfg: cfg,
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}
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// Create tcpmux httpconnect multiplexer.
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if cfg.TCPMuxHTTPConnectPort > 0 {
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var l net.Listener
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l, err = net.Listen("tcp", fmt.Sprintf("%s:%d", cfg.ProxyBindAddr, cfg.TCPMuxHTTPConnectPort))
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if err != nil {
err = fmt.Errorf("Create server listener error, %v", err)
return
}
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svr.rc.TCPMuxHTTPConnectMuxer, err = tcpmux.NewHTTPConnectTCPMuxer(l, vhostReadWriteTimeout)
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if err != nil {
err = fmt.Errorf("Create vhost tcpMuxer error, %v", err)
return
}
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log.Info("tcpmux httpconnect multiplexer listen on %s:%d", cfg.ProxyBindAddr, cfg.TCPMuxHTTPConnectPort)
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}
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// Init all plugins
plugin_names := make([]string, 0, len(cfg.HTTPPlugins))
for n := range cfg.HTTPPlugins {
plugin_names = append(plugin_names, n)
}
sort.Strings(plugin_names)
for _, name := range plugin_names {
svr.pluginManager.Register(plugin.NewHTTPPluginOptions(cfg.HTTPPlugins[name]))
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log.Info("plugin [%s] has been registered", name)
}
svr.rc.PluginManager = svr.pluginManager
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// Init group controller
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svr.rc.TCPGroupCtl = group.NewTCPGroupCtl(svr.rc.TCPPortManager)
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// Init HTTP group controller
svr.rc.HTTPGroupCtl = group.NewHTTPGroupController(svr.httpVhostRouter)
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// Init TCP mux group controller
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svr.rc.TCPMuxGroupCtl = group.NewTCPMuxGroupCtl(svr.rc.TCPMuxHTTPConnectMuxer)
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// Init 404 not found page
vhost.NotFoundPagePath = cfg.Custom404Page
var (
httpMuxOn bool
httpsMuxOn bool
)
if cfg.BindAddr == cfg.ProxyBindAddr {
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if cfg.BindPort == cfg.VhostHTTPPort {
httpMuxOn = true
}
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if cfg.BindPort == cfg.VhostHTTPSPort {
httpsMuxOn = true
}
}
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// Listen for accepting connections from client.
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address := net.JoinHostPort(cfg.BindAddr, strconv.Itoa(cfg.BindPort))
ln, err := net.Listen("tcp", address)
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if err != nil {
err = fmt.Errorf("Create server listener error, %v", err)
return
}
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svr.muxer = mux.NewMux(ln)
go svr.muxer.Serve()
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ln = svr.muxer.DefaultListener()
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svr.listener = ln
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log.Info("frps tcp listen on %s", address)
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// Listen for accepting connections from client using kcp protocol.
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if cfg.KCPBindPort > 0 {
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address := net.JoinHostPort(cfg.BindAddr, strconv.Itoa(cfg.KCPBindPort))
svr.kcpListener, err = frpNet.ListenKcp(address)
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if err != nil {
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err = fmt.Errorf("Listen on kcp address udp %s error: %v", address, err)
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return
}
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log.Info("frps kcp listen on udp %s:%d", cfg.BindAddr, cfg.KCPBindPort)
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}
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// Listen for accepting connections from client using websocket protocol.
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websocketPrefix := []byte("GET " + frpNet.FrpWebsocketPath)
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websocketLn := svr.muxer.Listen(0, uint32(len(websocketPrefix)), func(data []byte) bool {
return bytes.Equal(data, websocketPrefix)
})
svr.websocketListener = frpNet.NewWebsocketListener(websocketLn)
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// Create http vhost muxer.
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if cfg.VhostHTTPPort > 0 {
rp := vhost.NewHTTPReverseProxy(vhost.HTTPReverseProxyOptions{
ResponseHeaderTimeoutS: cfg.VhostHTTPTimeout,
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}, svr.httpVhostRouter)
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svr.rc.HTTPReverseProxy = rp
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address := net.JoinHostPort(cfg.ProxyBindAddr, strconv.Itoa(cfg.VhostHTTPPort))
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server := &http.Server{
Addr: address,
Handler: rp,
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}
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var l net.Listener
if httpMuxOn {
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l = svr.muxer.ListenHttp(1)
} else {
l, err = net.Listen("tcp", address)
if err != nil {
err = fmt.Errorf("Create vhost http listener error, %v", err)
return
}
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}
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go server.Serve(l)
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log.Info("http service listen on %s:%d", cfg.ProxyBindAddr, cfg.VhostHTTPPort)
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}
// Create https vhost muxer.
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if cfg.VhostHTTPSPort > 0 {
var l net.Listener
if httpsMuxOn {
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l = svr.muxer.ListenHttps(1)
} else {
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address := net.JoinHostPort(cfg.ProxyBindAddr, strconv.Itoa(cfg.VhostHTTPSPort))
l, err = net.Listen("tcp", address)
if err != nil {
err = fmt.Errorf("Create server listener error, %v", err)
return
}
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log.Info("https service listen on %s", address)
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}
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svr.rc.VhostHTTPSMuxer, err = vhost.NewHTTPSMuxer(l, vhostReadWriteTimeout)
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if err != nil {
err = fmt.Errorf("Create vhost httpsMuxer error, %v", err)
return
}
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}
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// frp tls listener
svr.tlsListener = svr.muxer.Listen(2, 1, func(data []byte) bool {
// tls first byte can be 0x16 only when vhost https port is not same with bind port
return int(data[0]) == frpNet.FRPTLSHeadByte || int(data[0]) == 0x16
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})
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// Create nat hole controller.
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if cfg.BindUDPPort > 0 {
var nc *nathole.Controller
address := net.JoinHostPort(cfg.BindAddr, strconv.Itoa(cfg.BindUDPPort))
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nc, err = nathole.NewController(address)
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if err != nil {
err = fmt.Errorf("Create nat hole controller error, %v", err)
return
}
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svr.rc.NatHoleController = nc
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log.Info("nat hole udp service listen on %s", address)
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}
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var statsEnable bool
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// Create dashboard web server.
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if cfg.DashboardPort > 0 {
// Init dashboard assets
assets.Load(cfg.AssetsDir)
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address := net.JoinHostPort(cfg.DashboardAddr, strconv.Itoa(cfg.DashboardPort))
err = svr.RunDashboardServer(address)
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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", cfg.DashboardAddr, cfg.DashboardPort)
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statsEnable = true
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}
if statsEnable {
modelmetrics.EnableMem()
if cfg.EnablePrometheus {
modelmetrics.EnablePrometheus()
}
}
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return
}
func (svr *Service) Run() {
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if svr.rc.NatHoleController != nil {
go svr.rc.NatHoleController.Run()
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}
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if svr.cfg.KCPBindPort > 0 {
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go svr.HandleListener(svr.kcpListener)
}
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go svr.HandleListener(svr.websocketListener)
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go svr.HandleListener(svr.tlsListener)
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svr.HandleListener(svr.listener)
}
func (svr *Service) handleConnection(ctx context.Context, conn net.Conn) {
xl := xlog.FromContextSafe(ctx)
var (
rawMsg msg.Message
err error
)
conn.SetReadDeadline(time.Now().Add(connReadTimeout))
if rawMsg, err = msg.ReadMsg(conn); err != nil {
log.Trace("Failed to read message: %v", err)
conn.Close()
return
}
conn.SetReadDeadline(time.Time{})
switch m := rawMsg.(type) {
case *msg.Login:
// server plugin hook
content := &plugin.LoginContent{
Login: *m,
}
retContent, err := svr.pluginManager.Login(content)
if err == nil {
m = &retContent.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 {
xl.Warn("register control error: %v", err)
msg.WriteMsg(conn, &msg.LoginResp{
Version: version.Full(),
Error: util.GenerateResponseErrorString("register control error", err, svr.cfg.DetailedErrorsToClient),
})
conn.Close()
}
case *msg.NewWorkConn:
if err := svr.RegisterWorkConn(conn, m); err != nil {
conn.Close()
}
case *msg.NewVisitorConn:
if err = svr.RegisterVisitorConn(conn, m); err != nil {
xl.Warn("register visitor conn error: %v", err)
msg.WriteMsg(conn, &msg.NewVisitorConnResp{
ProxyName: m.ProxyName,
Error: util.GenerateResponseErrorString("register visitor conn error", err, svr.cfg.DetailedErrorsToClient),
})
conn.Close()
} else {
msg.WriteMsg(conn, &msg.NewVisitorConnResp{
ProxyName: m.ProxyName,
Error: "",
})
}
default:
log.Warn("Error message type for the new connection [%s]", conn.RemoteAddr().String())
conn.Close()
}
}
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func (svr *Service) HandleListener(l net.Listener) {
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// Listen for incoming connections from client.
for {
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c, err := l.Accept()
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if err != nil {
log.Warn("Listener for incoming connections from client closed")
return
}
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// inject xlog object into net.Conn context
xl := xlog.New()
ctx := context.Background()
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c = frpNet.NewContextConn(xlog.NewContext(ctx, xl), c)
log.Trace("start check TLS connection...")
originConn := c
var isTLS, custom bool
c, isTLS, custom, err = frpNet.CheckAndEnableTLSServerConnWithTimeout(c, svr.tlsConfig, svr.cfg.TLSOnly, connReadTimeout)
if err != nil {
log.Warn("CheckAndEnableTLSServerConnWithTimeout error: %v", err)
originConn.Close()
continue
}
log.Trace("check TLS connection success, isTLS: %v custom: %v", isTLS, custom)
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// Start a new goroutine to handle connection.
go func(ctx context.Context, frpConn net.Conn) {
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if svr.cfg.TCPMux {
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fmuxCfg := fmux.DefaultConfig()
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fmuxCfg.KeepAliveInterval = 20 * time.Second
fmuxCfg.LogOutput = io.Discard
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session, err := fmux.Server(frpConn, fmuxCfg)
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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.Debug("Accept new mux stream error: %v", err)
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session.Close()
return
}
go svr.handleConnection(ctx, stream)
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}
} else {
svr.handleConnection(ctx, frpConn)
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}
}(ctx, c)
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}
}
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func (svr *Service) RegisterControl(ctlConn net.Conn, loginMsg *msg.Login) (err error) {
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// If client's RunID is empty, it's a new client, we just create a new controller.
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// Otherwise, we check if there is one controller has the same run id. If so, we release previous controller and start new one.
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if loginMsg.RunID == "" {
loginMsg.RunID, err = util.RandID()
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if err != nil {
return
}
}
ctx := frpNet.NewContextFromConn(ctlConn)
xl := xlog.FromContextSafe(ctx)
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xl.AppendPrefix(loginMsg.RunID)
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ctx = xlog.NewContext(ctx, xl)
xl.Info("client login info: ip [%s] version [%s] hostname [%s] os [%s] arch [%s]",
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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.
if err = svr.authVerifier.VerifyLogin(loginMsg); err != nil {
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return
}
ctl := NewControl(ctx, svr.rc, svr.pxyManager, svr.pluginManager, svr.authVerifier, ctlConn, loginMsg, svr.cfg)
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if oldCtl := svr.ctlManager.Add(loginMsg.RunID, ctl); oldCtl != nil {
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oldCtl.allShutdown.WaitDone()
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}
ctl.Start()
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// for statistics
metrics.Server.NewClient()
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go func() {
// block until control closed
ctl.WaitClosed()
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svr.ctlManager.Del(loginMsg.RunID, ctl)
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}()
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return
}
// RegisterWorkConn register a new work connection to control and proxies need it.
func (svr *Service) RegisterWorkConn(workConn net.Conn, newMsg *msg.NewWorkConn) error {
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xl := frpNet.NewLogFromConn(workConn)
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ctl, exist := svr.ctlManager.GetByID(newMsg.RunID)
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if !exist {
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xl.Warn("No client control found for run id [%s]", newMsg.RunID)
return fmt.Errorf("no client control found for run id [%s]", newMsg.RunID)
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}
// server plugin hook
content := &plugin.NewWorkConnContent{
User: plugin.UserInfo{
User: ctl.loginMsg.User,
Metas: ctl.loginMsg.Metas,
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RunID: ctl.loginMsg.RunID,
},
NewWorkConn: *newMsg,
}
retContent, err := svr.pluginManager.NewWorkConn(content)
if err == nil {
newMsg = &retContent.NewWorkConn
// Check auth.
err = svr.authVerifier.VerifyNewWorkConn(newMsg)
}
if err != nil {
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xl.Warn("invalid NewWorkConn with run id [%s]", newMsg.RunID)
msg.WriteMsg(workConn, &msg.StartWorkConn{
Error: util.GenerateResponseErrorString("invalid NewWorkConn", err, ctl.serverCfg.DetailedErrorsToClient),
})
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return fmt.Errorf("invalid NewWorkConn with run id [%s]", newMsg.RunID)
}
return ctl.RegisterWorkConn(workConn)
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}
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func (svr *Service) RegisterVisitorConn(visitorConn net.Conn, newMsg *msg.NewVisitorConn) error {
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return svr.rc.VisitorManager.NewConn(newMsg.ProxyName, visitorConn, newMsg.Timestamp, newMsg.SignKey,
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newMsg.UseEncryption, newMsg.UseCompression)
}