2020-04-20 07:35:47 +02:00
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// Copyright 2020 guylewin, guy@lewin.co.il
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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 group
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import (
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"context"
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"fmt"
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"net"
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"sync"
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2022-08-28 19:02:53 +02:00
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gerr "github.com/fatedier/golib/errors"
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2020-09-23 07:49:14 +02:00
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"github.com/fatedier/frp/pkg/consts"
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"github.com/fatedier/frp/pkg/util/tcpmux"
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"github.com/fatedier/frp/pkg/util/vhost"
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2020-04-20 07:35:47 +02:00
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)
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2020-05-24 11:48:37 +02:00
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// TCPMuxGroupCtl manage all TCPMuxGroups
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type TCPMuxGroupCtl struct {
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groups map[string]*TCPMuxGroup
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// portManager is used to manage port
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tcpMuxHTTPConnectMuxer *tcpmux.HTTPConnectTCPMuxer
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2020-04-20 07:35:47 +02:00
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mu sync.Mutex
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}
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2020-05-24 11:48:37 +02:00
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// NewTCPMuxGroupCtl return a new TCPMuxGroupCtl
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func NewTCPMuxGroupCtl(tcpMuxHTTPConnectMuxer *tcpmux.HTTPConnectTCPMuxer) *TCPMuxGroupCtl {
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return &TCPMuxGroupCtl{
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groups: make(map[string]*TCPMuxGroup),
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tcpMuxHTTPConnectMuxer: tcpMuxHTTPConnectMuxer,
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2020-04-20 07:35:47 +02:00
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}
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}
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2020-05-24 11:48:37 +02:00
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// Listen is the wrapper for TCPMuxGroup's Listen
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2020-04-20 07:35:47 +02:00
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// If there are no group, we will create one here
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func (tmgc *TCPMuxGroupCtl) Listen(
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ctx context.Context,
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multiplexer, group, groupKey string,
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routeConfig vhost.RouteConfig,
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) (l net.Listener, err error) {
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tmgc.mu.Lock()
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tcpMuxGroup, ok := tmgc.groups[group]
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if !ok {
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tcpMuxGroup = NewTCPMuxGroup(tmgc)
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tmgc.groups[group] = tcpMuxGroup
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}
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tmgc.mu.Unlock()
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switch multiplexer {
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case consts.HTTPConnectTCPMultiplexer:
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return tcpMuxGroup.HTTPConnectListen(ctx, group, groupKey, routeConfig)
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default:
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err = fmt.Errorf("unknown multiplexer [%s]", multiplexer)
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return
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}
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}
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// RemoveGroup remove TCPMuxGroup from controller
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func (tmgc *TCPMuxGroupCtl) RemoveGroup(group string) {
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tmgc.mu.Lock()
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defer tmgc.mu.Unlock()
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delete(tmgc.groups, group)
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}
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// TCPMuxGroup route connections to different proxies
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type TCPMuxGroup struct {
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group string
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groupKey string
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domain string
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routeByHTTPUser string
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acceptCh chan net.Conn
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tcpMuxLn net.Listener
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lns []*TCPMuxGroupListener
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ctl *TCPMuxGroupCtl
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mu sync.Mutex
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}
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2020-05-24 11:48:37 +02:00
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// NewTCPMuxGroup return a new TCPMuxGroup
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func NewTCPMuxGroup(ctl *TCPMuxGroupCtl) *TCPMuxGroup {
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return &TCPMuxGroup{
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lns: make([]*TCPMuxGroupListener, 0),
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ctl: ctl,
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acceptCh: make(chan net.Conn),
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}
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}
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2020-05-24 11:48:37 +02:00
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// Listen will return a new TCPMuxGroupListener
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// if TCPMuxGroup already has a listener, just add a new TCPMuxGroupListener to the queues
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// otherwise, listen on the real address
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func (tmg *TCPMuxGroup) HTTPConnectListen(
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ctx context.Context,
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group, groupKey string,
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routeConfig vhost.RouteConfig,
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) (ln *TCPMuxGroupListener, err error) {
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tmg.mu.Lock()
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defer tmg.mu.Unlock()
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if len(tmg.lns) == 0 {
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// the first listener, listen on the real address
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tcpMuxLn, errRet := tmg.ctl.tcpMuxHTTPConnectMuxer.Listen(ctx, &routeConfig)
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if errRet != nil {
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return nil, errRet
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}
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ln = newTCPMuxGroupListener(group, tmg, tcpMuxLn.Addr())
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tmg.group = group
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tmg.groupKey = groupKey
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tmg.domain = routeConfig.Domain
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tmg.routeByHTTPUser = routeConfig.RouteByHTTPUser
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tmg.tcpMuxLn = tcpMuxLn
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tmg.lns = append(tmg.lns, ln)
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if tmg.acceptCh == nil {
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tmg.acceptCh = make(chan net.Conn)
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}
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go tmg.worker()
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} else {
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// route config in the same group must be equal
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if tmg.group != group || tmg.domain != routeConfig.Domain || tmg.routeByHTTPUser != routeConfig.RouteByHTTPUser {
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return nil, ErrGroupParamsInvalid
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}
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if tmg.groupKey != groupKey {
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return nil, ErrGroupAuthFailed
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}
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ln = newTCPMuxGroupListener(group, tmg, tmg.lns[0].Addr())
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tmg.lns = append(tmg.lns, ln)
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}
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return
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}
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// worker is called when the real TCP listener has been created
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func (tmg *TCPMuxGroup) worker() {
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for {
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c, err := tmg.tcpMuxLn.Accept()
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if err != nil {
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return
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}
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err = gerr.PanicToError(func() {
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tmg.acceptCh <- c
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})
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if err != nil {
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return
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}
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}
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}
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func (tmg *TCPMuxGroup) Accept() <-chan net.Conn {
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return tmg.acceptCh
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}
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// CloseListener remove the TCPMuxGroupListener from the TCPMuxGroup
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func (tmg *TCPMuxGroup) CloseListener(ln *TCPMuxGroupListener) {
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tmg.mu.Lock()
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defer tmg.mu.Unlock()
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for i, tmpLn := range tmg.lns {
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if tmpLn == ln {
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tmg.lns = append(tmg.lns[:i], tmg.lns[i+1:]...)
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break
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}
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}
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if len(tmg.lns) == 0 {
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close(tmg.acceptCh)
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tmg.tcpMuxLn.Close()
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tmg.ctl.RemoveGroup(tmg.group)
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}
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}
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// TCPMuxGroupListener
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type TCPMuxGroupListener struct {
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groupName string
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group *TCPMuxGroup
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addr net.Addr
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closeCh chan struct{}
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}
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func newTCPMuxGroupListener(name string, group *TCPMuxGroup, addr net.Addr) *TCPMuxGroupListener {
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return &TCPMuxGroupListener{
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groupName: name,
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group: group,
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addr: addr,
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closeCh: make(chan struct{}),
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}
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}
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// Accept will accept connections from TCPMuxGroup
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func (ln *TCPMuxGroupListener) Accept() (c net.Conn, err error) {
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var ok bool
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select {
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case <-ln.closeCh:
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return nil, ErrListenerClosed
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case c, ok = <-ln.group.Accept():
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if !ok {
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return nil, ErrListenerClosed
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}
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return c, nil
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}
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}
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func (ln *TCPMuxGroupListener) Addr() net.Addr {
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return ln.addr
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}
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// Close close the listener
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func (ln *TCPMuxGroupListener) Close() (err error) {
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close(ln.closeCh)
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// remove self from TcpMuxGroup
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ln.group.CloseListener(ln)
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return
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}
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