mirror of
https://github.com/fatedier/frp.git
synced 2024-12-12 17:50:51 +01:00
322 lines
8.4 KiB
Go
322 lines
8.4 KiB
Go
// 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.
|
|
|
|
package proxy
|
|
|
|
import (
|
|
"context"
|
|
"fmt"
|
|
"io"
|
|
"net"
|
|
"strconv"
|
|
"sync"
|
|
|
|
"github.com/fatedier/frp/models/config"
|
|
"github.com/fatedier/frp/models/msg"
|
|
plugin "github.com/fatedier/frp/models/plugin/server"
|
|
"github.com/fatedier/frp/server/controller"
|
|
"github.com/fatedier/frp/server/metrics"
|
|
frpNet "github.com/fatedier/frp/utils/net"
|
|
"github.com/fatedier/frp/utils/xlog"
|
|
|
|
frpIo "github.com/fatedier/golib/io"
|
|
)
|
|
|
|
type GetWorkConnFn func() (net.Conn, error)
|
|
|
|
type Proxy interface {
|
|
Context() context.Context
|
|
Run() (remoteAddr string, err error)
|
|
GetName() string
|
|
GetConf() config.ProxyConf
|
|
GetWorkConnFromPool(src, dst net.Addr) (workConn net.Conn, err error)
|
|
GetUsedPortsNum() int
|
|
GetResourceController() *controller.ResourceController
|
|
GetUserInfo() plugin.UserInfo
|
|
Close()
|
|
}
|
|
|
|
type BaseProxy struct {
|
|
name string
|
|
rc *controller.ResourceController
|
|
listeners []net.Listener
|
|
usedPortsNum int
|
|
poolCount int
|
|
getWorkConnFn GetWorkConnFn
|
|
serverCfg config.ServerCommonConf
|
|
userInfo plugin.UserInfo
|
|
|
|
mu sync.RWMutex
|
|
xl *xlog.Logger
|
|
ctx context.Context
|
|
}
|
|
|
|
func (pxy *BaseProxy) GetName() string {
|
|
return pxy.name
|
|
}
|
|
|
|
func (pxy *BaseProxy) Context() context.Context {
|
|
return pxy.ctx
|
|
}
|
|
|
|
func (pxy *BaseProxy) GetUsedPortsNum() int {
|
|
return pxy.usedPortsNum
|
|
}
|
|
|
|
func (pxy *BaseProxy) GetResourceController() *controller.ResourceController {
|
|
return pxy.rc
|
|
}
|
|
|
|
func (pxy *BaseProxy) GetUserInfo() plugin.UserInfo {
|
|
return pxy.userInfo
|
|
}
|
|
|
|
func (pxy *BaseProxy) Close() {
|
|
xl := xlog.FromContextSafe(pxy.ctx)
|
|
xl.Info("proxy closing")
|
|
for _, l := range pxy.listeners {
|
|
l.Close()
|
|
}
|
|
}
|
|
|
|
// GetWorkConnFromPool try to get a new work connections from pool
|
|
// for quickly response, we immediately send the StartWorkConn message to frpc after take out one from pool
|
|
func (pxy *BaseProxy) GetWorkConnFromPool(src, dst net.Addr) (workConn net.Conn, err error) {
|
|
xl := xlog.FromContextSafe(pxy.ctx)
|
|
// try all connections from the pool
|
|
for i := 0; i < pxy.poolCount+1; i++ {
|
|
if workConn, err = pxy.getWorkConnFn(); err != nil {
|
|
xl.Warn("failed to get work connection: %v", err)
|
|
return
|
|
}
|
|
xl.Info("get a new work connection: [%s]", workConn.RemoteAddr().String())
|
|
xl.Spawn().AppendPrefix(pxy.GetName())
|
|
workConn = frpNet.NewContextConn(pxy.ctx, workConn)
|
|
|
|
var (
|
|
srcAddr string
|
|
dstAddr string
|
|
srcPortStr string
|
|
dstPortStr string
|
|
srcPort int
|
|
dstPort int
|
|
)
|
|
|
|
if src != nil {
|
|
srcAddr, srcPortStr, _ = net.SplitHostPort(src.String())
|
|
srcPort, _ = strconv.Atoi(srcPortStr)
|
|
}
|
|
if dst != nil {
|
|
dstAddr, dstPortStr, _ = net.SplitHostPort(dst.String())
|
|
dstPort, _ = strconv.Atoi(dstPortStr)
|
|
}
|
|
err := msg.WriteMsg(workConn, &msg.StartWorkConn{
|
|
ProxyName: pxy.GetName(),
|
|
SrcAddr: srcAddr,
|
|
SrcPort: uint16(srcPort),
|
|
DstAddr: dstAddr,
|
|
DstPort: uint16(dstPort),
|
|
Error: "",
|
|
})
|
|
if err != nil {
|
|
xl.Warn("failed to send message to work connection from pool: %v, times: %d", err, i)
|
|
workConn.Close()
|
|
} else {
|
|
break
|
|
}
|
|
}
|
|
|
|
if err != nil {
|
|
xl.Error("try to get work connection failed in the end")
|
|
return
|
|
}
|
|
return
|
|
}
|
|
|
|
// startListenHandler start a goroutine handler for each listener.
|
|
// p: p will just be passed to handler(Proxy, frpNet.Conn).
|
|
// handler: each proxy type can set different handler function to deal with connections accepted from listeners.
|
|
func (pxy *BaseProxy) startListenHandler(p Proxy, handler func(Proxy, net.Conn, config.ServerCommonConf)) {
|
|
xl := xlog.FromContextSafe(pxy.ctx)
|
|
for _, listener := range pxy.listeners {
|
|
go func(l net.Listener) {
|
|
for {
|
|
// block
|
|
// if listener is closed, err returned
|
|
c, err := l.Accept()
|
|
if err != nil {
|
|
xl.Info("listener is closed")
|
|
return
|
|
}
|
|
xl.Debug("get a user connection [%s]", c.RemoteAddr().String())
|
|
go handler(p, c, pxy.serverCfg)
|
|
}
|
|
}(listener)
|
|
}
|
|
}
|
|
|
|
func NewProxy(ctx context.Context, userInfo plugin.UserInfo, rc *controller.ResourceController, poolCount int,
|
|
getWorkConnFn GetWorkConnFn, pxyConf config.ProxyConf, serverCfg config.ServerCommonConf) (pxy Proxy, err error) {
|
|
|
|
xl := xlog.FromContextSafe(ctx).Spawn().AppendPrefix(pxyConf.GetBaseInfo().ProxyName)
|
|
basePxy := BaseProxy{
|
|
name: pxyConf.GetBaseInfo().ProxyName,
|
|
rc: rc,
|
|
listeners: make([]net.Listener, 0),
|
|
poolCount: poolCount,
|
|
getWorkConnFn: getWorkConnFn,
|
|
serverCfg: serverCfg,
|
|
xl: xl,
|
|
ctx: xlog.NewContext(ctx, xl),
|
|
userInfo: userInfo,
|
|
}
|
|
switch cfg := pxyConf.(type) {
|
|
case *config.TCPProxyConf:
|
|
basePxy.usedPortsNum = 1
|
|
pxy = &TCPProxy{
|
|
BaseProxy: &basePxy,
|
|
cfg: cfg,
|
|
}
|
|
case *config.TCPMuxProxyConf:
|
|
pxy = &TCPMuxProxy{
|
|
BaseProxy: &basePxy,
|
|
cfg: cfg,
|
|
}
|
|
case *config.HTTPProxyConf:
|
|
pxy = &HTTPProxy{
|
|
BaseProxy: &basePxy,
|
|
cfg: cfg,
|
|
}
|
|
case *config.HTTPSProxyConf:
|
|
pxy = &HTTPSProxy{
|
|
BaseProxy: &basePxy,
|
|
cfg: cfg,
|
|
}
|
|
case *config.UDPProxyConf:
|
|
basePxy.usedPortsNum = 1
|
|
pxy = &UDPProxy{
|
|
BaseProxy: &basePxy,
|
|
cfg: cfg,
|
|
}
|
|
case *config.STCPProxyConf:
|
|
pxy = &STCPProxy{
|
|
BaseProxy: &basePxy,
|
|
cfg: cfg,
|
|
}
|
|
case *config.XTCPProxyConf:
|
|
pxy = &XTCPProxy{
|
|
BaseProxy: &basePxy,
|
|
cfg: cfg,
|
|
}
|
|
case *config.SUDPProxyConf:
|
|
pxy = &SUDPProxy{
|
|
BaseProxy: &basePxy,
|
|
cfg: cfg,
|
|
}
|
|
default:
|
|
return pxy, fmt.Errorf("proxy type not support")
|
|
}
|
|
return
|
|
}
|
|
|
|
// HandleUserTCPConnection is used for incoming user TCP connections.
|
|
// It can be used for tcp, http, https type.
|
|
func HandleUserTCPConnection(pxy Proxy, userConn net.Conn, serverCfg config.ServerCommonConf) {
|
|
xl := xlog.FromContextSafe(pxy.Context())
|
|
defer userConn.Close()
|
|
|
|
// server plugin hook
|
|
rc := pxy.GetResourceController()
|
|
content := &plugin.NewUserConnContent{
|
|
User: pxy.GetUserInfo(),
|
|
ProxyName: pxy.GetName(),
|
|
ProxyType: pxy.GetConf().GetBaseInfo().ProxyType,
|
|
RemoteAddr: userConn.RemoteAddr().String(),
|
|
}
|
|
_, err := rc.PluginManager.NewUserConn(content)
|
|
if err != nil {
|
|
xl.Warn("the user conn [%s] was rejected, err:%v", content.RemoteAddr, err)
|
|
return
|
|
}
|
|
|
|
// try all connections from the pool
|
|
workConn, err := pxy.GetWorkConnFromPool(userConn.RemoteAddr(), userConn.LocalAddr())
|
|
if err != nil {
|
|
return
|
|
}
|
|
defer workConn.Close()
|
|
|
|
var local io.ReadWriteCloser = workConn
|
|
cfg := pxy.GetConf().GetBaseInfo()
|
|
xl.Trace("handler user tcp connection, use_encryption: %t, use_compression: %t", cfg.UseEncryption, cfg.UseCompression)
|
|
if cfg.UseEncryption {
|
|
local, err = frpIo.WithEncryption(local, []byte(serverCfg.Token))
|
|
if err != nil {
|
|
xl.Error("create encryption stream error: %v", err)
|
|
return
|
|
}
|
|
}
|
|
if cfg.UseCompression {
|
|
local = frpIo.WithCompression(local)
|
|
}
|
|
xl.Debug("join connections, workConn(l[%s] r[%s]) userConn(l[%s] r[%s])", workConn.LocalAddr().String(),
|
|
workConn.RemoteAddr().String(), userConn.LocalAddr().String(), userConn.RemoteAddr().String())
|
|
|
|
name := pxy.GetName()
|
|
proxyType := pxy.GetConf().GetBaseInfo().ProxyType
|
|
metrics.Server.OpenConnection(name, proxyType)
|
|
inCount, outCount := frpIo.Join(local, userConn)
|
|
metrics.Server.CloseConnection(name, proxyType)
|
|
metrics.Server.AddTrafficIn(name, proxyType, inCount)
|
|
metrics.Server.AddTrafficOut(name, proxyType, outCount)
|
|
xl.Debug("join connections closed")
|
|
}
|
|
|
|
type Manager struct {
|
|
// proxies indexed by proxy name
|
|
pxys map[string]Proxy
|
|
|
|
mu sync.RWMutex
|
|
}
|
|
|
|
func NewManager() *Manager {
|
|
return &Manager{
|
|
pxys: make(map[string]Proxy),
|
|
}
|
|
}
|
|
|
|
func (pm *Manager) Add(name string, pxy Proxy) error {
|
|
pm.mu.Lock()
|
|
defer pm.mu.Unlock()
|
|
if _, ok := pm.pxys[name]; ok {
|
|
return fmt.Errorf("proxy name [%s] is already in use", name)
|
|
}
|
|
|
|
pm.pxys[name] = pxy
|
|
return nil
|
|
}
|
|
|
|
func (pm *Manager) Del(name string) {
|
|
pm.mu.Lock()
|
|
defer pm.mu.Unlock()
|
|
delete(pm.pxys, name)
|
|
}
|
|
|
|
func (pm *Manager) GetByName(name string) (pxy Proxy, ok bool) {
|
|
pm.mu.RLock()
|
|
defer pm.mu.RUnlock()
|
|
pxy, ok = pm.pxys[name]
|
|
return
|
|
}
|