mirror of
https://github.com/fatedier/frp.git
synced 2024-11-07 16:44:29 +01:00
361 lines
8.3 KiB
Go
361 lines
8.3 KiB
Go
// Copyright 2017 fatedier, fatedier@gmail.com
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//
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// Licensed under the Apache License, Version 2.0 (the "License");
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// you may not use this file except in compliance with the License.
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// You may obtain a copy of the License at
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//
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// http://www.apache.org/licenses/LICENSE-2.0
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//
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// Unless required by applicable law or agreed to in writing, software
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// distributed under the License is distributed on an "AS IS" BASIS,
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// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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// See the License for the specific language governing permissions and
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// limitations under the License.
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package server
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import (
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"fmt"
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"io"
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"sync"
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"time"
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"github.com/fatedier/frp/models/config"
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"github.com/fatedier/frp/models/consts"
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"github.com/fatedier/frp/models/msg"
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"github.com/fatedier/frp/utils/crypto"
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"github.com/fatedier/frp/utils/errors"
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"github.com/fatedier/frp/utils/net"
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"github.com/fatedier/frp/utils/shutdown"
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"github.com/fatedier/frp/utils/version"
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)
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type Control struct {
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// frps service
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svr *Service
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// login message
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loginMsg *msg.Login
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// control connection
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conn net.Conn
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// put a message in this channel to send it over control connection to client
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sendCh chan (msg.Message)
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// read from this channel to get the next message sent by client
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readCh chan (msg.Message)
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// work connections
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workConnCh chan net.Conn
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// proxies in one client
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proxies []Proxy
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// pool count
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poolCount int
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// last time got the Ping message
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lastPing time.Time
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// A new run id will be generated when a new client login.
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// If run id got from login message has same run id, it means it's the same client, so we can
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// replace old controller instantly.
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runId string
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// control status
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status string
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readerShutdown *shutdown.Shutdown
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writerShutdown *shutdown.Shutdown
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managerShutdown *shutdown.Shutdown
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allShutdown *shutdown.Shutdown
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mu sync.RWMutex
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}
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func NewControl(svr *Service, ctlConn net.Conn, loginMsg *msg.Login) *Control {
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return &Control{
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svr: svr,
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conn: ctlConn,
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loginMsg: loginMsg,
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sendCh: make(chan msg.Message, 10),
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readCh: make(chan msg.Message, 10),
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workConnCh: make(chan net.Conn, loginMsg.PoolCount+10),
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proxies: make([]Proxy, 0),
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poolCount: loginMsg.PoolCount,
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lastPing: time.Now(),
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runId: loginMsg.RunId,
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status: consts.Working,
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readerShutdown: shutdown.New(),
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writerShutdown: shutdown.New(),
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managerShutdown: shutdown.New(),
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allShutdown: shutdown.New(),
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}
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}
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// Start send a login success message to client and start working.
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func (ctl *Control) Start() {
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loginRespMsg := &msg.LoginResp{
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Version: version.Full(),
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RunId: ctl.runId,
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Error: "",
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}
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msg.WriteMsg(ctl.conn, loginRespMsg)
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go ctl.writer()
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for i := 0; i < ctl.poolCount; i++ {
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ctl.sendCh <- &msg.ReqWorkConn{}
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}
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go ctl.manager()
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go ctl.reader()
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go ctl.stoper()
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}
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func (ctl *Control) RegisterWorkConn(conn net.Conn) {
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defer func() {
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if err := recover(); err != nil {
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ctl.conn.Error("panic error: %v", err)
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}
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}()
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select {
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case ctl.workConnCh <- conn:
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ctl.conn.Debug("new work connection registered")
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default:
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ctl.conn.Debug("work connection pool is full, discarding")
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conn.Close()
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}
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}
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// When frps get one user connection, we get one work connection from the pool and return it.
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// If no workConn available in the pool, send message to frpc to get one or more
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// and wait until it is available.
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// return an error if wait timeout
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func (ctl *Control) GetWorkConn() (workConn net.Conn, err error) {
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defer func() {
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if err := recover(); err != nil {
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ctl.conn.Error("panic error: %v", err)
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}
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}()
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var ok bool
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// get a work connection from the pool
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select {
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case workConn, ok = <-ctl.workConnCh:
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if !ok {
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err = errors.ErrCtlClosed
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return
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}
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ctl.conn.Debug("get work connection from pool")
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default:
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// no work connections available in the poll, send message to frpc to get more
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err = errors.PanicToError(func() {
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ctl.sendCh <- &msg.ReqWorkConn{}
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})
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if err != nil {
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ctl.conn.Error("%v", err)
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return
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}
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select {
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case workConn, ok = <-ctl.workConnCh:
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if !ok {
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err = errors.ErrCtlClosed
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ctl.conn.Warn("no work connections avaiable, %v", err)
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return
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}
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case <-time.After(time.Duration(config.ServerCommonCfg.UserConnTimeout) * time.Second):
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err = fmt.Errorf("timeout trying to get work connection")
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ctl.conn.Warn("%v", err)
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return
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}
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}
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// When we get a work connection from pool, replace it with a new one.
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errors.PanicToError(func() {
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ctl.sendCh <- &msg.ReqWorkConn{}
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})
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return
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}
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func (ctl *Control) Replaced(newCtl *Control) {
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ctl.conn.Info("Replaced by client [%s]", newCtl.runId)
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ctl.runId = ""
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ctl.allShutdown.Start()
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}
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func (ctl *Control) writer() {
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defer func() {
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if err := recover(); err != nil {
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ctl.conn.Error("panic error: %v", err)
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}
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}()
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defer ctl.allShutdown.Start()
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defer ctl.writerShutdown.Done()
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encWriter, err := crypto.NewWriter(ctl.conn, []byte(config.ServerCommonCfg.PrivilegeToken))
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if err != nil {
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ctl.conn.Error("crypto new writer error: %v", err)
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ctl.allShutdown.Start()
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return
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}
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for {
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if m, ok := <-ctl.sendCh; !ok {
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ctl.conn.Info("control writer is closing")
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return
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} else {
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if err := msg.WriteMsg(encWriter, m); err != nil {
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ctl.conn.Warn("write message to control connection error: %v", err)
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return
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}
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}
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}
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}
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func (ctl *Control) reader() {
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defer func() {
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if err := recover(); err != nil {
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ctl.conn.Error("panic error: %v", err)
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}
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}()
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defer ctl.allShutdown.Start()
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defer ctl.readerShutdown.Done()
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encReader := crypto.NewReader(ctl.conn, []byte(config.ServerCommonCfg.PrivilegeToken))
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for {
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if m, err := msg.ReadMsg(encReader); err != nil {
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if err == io.EOF {
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ctl.conn.Debug("control connection closed")
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return
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} else {
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ctl.conn.Warn("read error: %v", err)
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return
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}
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} else {
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ctl.readCh <- m
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}
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}
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}
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func (ctl *Control) stoper() {
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defer func() {
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if err := recover(); err != nil {
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ctl.conn.Error("panic error: %v", err)
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}
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}()
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ctl.allShutdown.WaitStart()
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close(ctl.readCh)
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ctl.managerShutdown.WaitDown()
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close(ctl.sendCh)
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ctl.writerShutdown.WaitDown()
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ctl.conn.Close()
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ctl.readerShutdown.WaitDown()
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close(ctl.workConnCh)
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for workConn := range ctl.workConnCh {
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workConn.Close()
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}
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for _, pxy := range ctl.proxies {
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pxy.Close()
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ctl.svr.DelProxy(pxy.GetName())
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StatsCloseProxy(pxy.GetName(), pxy.GetConf().GetBaseInfo().ProxyType)
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}
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ctl.allShutdown.Done()
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ctl.conn.Info("client exit success")
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StatsCloseClient()
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}
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func (ctl *Control) manager() {
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defer func() {
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if err := recover(); err != nil {
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ctl.conn.Error("panic error: %v", err)
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}
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}()
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defer ctl.allShutdown.Start()
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defer ctl.managerShutdown.Done()
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heartbeat := time.NewTicker(time.Second)
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defer heartbeat.Stop()
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for {
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select {
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case <-heartbeat.C:
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if time.Since(ctl.lastPing) > time.Duration(config.ServerCommonCfg.HeartBeatTimeout)*time.Second {
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ctl.conn.Warn("heartbeat timeout")
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ctl.allShutdown.Start()
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}
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case rawMsg, ok := <-ctl.readCh:
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if !ok {
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return
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}
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switch m := rawMsg.(type) {
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case *msg.NewProxy:
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// register proxy in this control
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err := ctl.RegisterProxy(m)
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resp := &msg.NewProxyResp{
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ProxyName: m.ProxyName,
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}
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if err != nil {
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resp.Error = err.Error()
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ctl.conn.Warn("new proxy [%s] error: %v", m.ProxyName, err)
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} else {
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ctl.conn.Info("new proxy [%s] success", m.ProxyName)
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StatsNewProxy(m.ProxyName, m.ProxyType)
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}
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ctl.sendCh <- resp
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case *msg.Ping:
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ctl.lastPing = time.Now()
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ctl.conn.Debug("receive heartbeat")
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ctl.sendCh <- &msg.Pong{}
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}
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}
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}
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}
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func (ctl *Control) RegisterProxy(pxyMsg *msg.NewProxy) (err error) {
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var pxyConf config.ProxyConf
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// Load configures from NewProxy message and check.
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pxyConf, err = config.NewProxyConf(pxyMsg)
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if err != nil {
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return err
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}
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// NewProxy will return a interface Proxy.
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// In fact it create different proxies by different proxy type, we just call run() here.
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pxy, err := NewProxy(ctl, pxyConf)
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if err != nil {
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return err
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}
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err = pxy.Run()
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if err != nil {
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return err
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}
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defer func() {
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if err != nil {
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pxy.Close()
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}
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}()
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err = ctl.svr.RegisterProxy(pxyMsg.ProxyName, pxy)
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if err != nil {
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return err
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}
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ctl.proxies = append(ctl.proxies, pxy)
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return nil
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}
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