mirror of
https://github.com/fatedier/frp.git
synced 2024-12-15 19:21:01 +01:00
259 lines
4.8 KiB
Go
259 lines
4.8 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 net
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import (
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"fmt"
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"io"
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"net"
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"strconv"
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"sync"
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"time"
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"github.com/fatedier/golib/pool"
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)
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type UDPPacket struct {
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Buf []byte
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LocalAddr net.Addr
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RemoteAddr net.Addr
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}
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type FakeUDPConn struct {
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l *UDPListener
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localAddr net.Addr
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remoteAddr net.Addr
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packets chan []byte
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closeFlag bool
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lastActive time.Time
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mu sync.RWMutex
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}
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func NewFakeUDPConn(l *UDPListener, laddr, raddr net.Addr) *FakeUDPConn {
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fc := &FakeUDPConn{
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l: l,
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localAddr: laddr,
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remoteAddr: raddr,
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packets: make(chan []byte, 20),
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}
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go func() {
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for {
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time.Sleep(5 * time.Second)
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fc.mu.RLock()
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if time.Since(fc.lastActive) > 10*time.Second {
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fc.mu.RUnlock()
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fc.Close()
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break
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}
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fc.mu.RUnlock()
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}
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}()
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return fc
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}
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func (c *FakeUDPConn) putPacket(content []byte) {
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defer func() {
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_ = recover()
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}()
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select {
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case c.packets <- content:
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default:
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}
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}
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func (c *FakeUDPConn) Read(b []byte) (n int, err error) {
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content, ok := <-c.packets
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if !ok {
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return 0, io.EOF
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}
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c.mu.Lock()
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c.lastActive = time.Now()
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c.mu.Unlock()
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if len(b) < len(content) {
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n = len(b)
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} else {
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n = len(content)
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}
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copy(b, content)
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return n, nil
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}
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func (c *FakeUDPConn) Write(b []byte) (n int, err error) {
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c.mu.RLock()
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if c.closeFlag {
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c.mu.RUnlock()
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return 0, io.ErrClosedPipe
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}
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c.mu.RUnlock()
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packet := &UDPPacket{
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Buf: b,
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LocalAddr: c.localAddr,
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RemoteAddr: c.remoteAddr,
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}
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_ = c.l.writeUDPPacket(packet)
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c.mu.Lock()
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c.lastActive = time.Now()
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c.mu.Unlock()
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return len(b), nil
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}
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func (c *FakeUDPConn) Close() error {
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c.mu.Lock()
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defer c.mu.Unlock()
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if !c.closeFlag {
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c.closeFlag = true
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close(c.packets)
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}
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return nil
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}
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func (c *FakeUDPConn) IsClosed() bool {
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c.mu.RLock()
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defer c.mu.RUnlock()
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return c.closeFlag
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}
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func (c *FakeUDPConn) LocalAddr() net.Addr {
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return c.localAddr
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}
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func (c *FakeUDPConn) RemoteAddr() net.Addr {
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return c.remoteAddr
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}
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func (c *FakeUDPConn) SetDeadline(t time.Time) error {
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return nil
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}
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func (c *FakeUDPConn) SetReadDeadline(t time.Time) error {
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return nil
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}
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func (c *FakeUDPConn) SetWriteDeadline(t time.Time) error {
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return nil
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}
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type UDPListener struct {
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addr net.Addr
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acceptCh chan net.Conn
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writeCh chan *UDPPacket
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readConn net.Conn
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closeFlag bool
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fakeConns map[string]*FakeUDPConn
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}
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func ListenUDP(bindAddr string, bindPort int) (l *UDPListener, err error) {
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udpAddr, err := net.ResolveUDPAddr("udp", net.JoinHostPort(bindAddr, strconv.Itoa(bindPort)))
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if err != nil {
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return l, err
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}
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readConn, err := net.ListenUDP("udp", udpAddr)
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l = &UDPListener{
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addr: udpAddr,
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acceptCh: make(chan net.Conn),
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writeCh: make(chan *UDPPacket, 1000),
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fakeConns: make(map[string]*FakeUDPConn),
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}
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// for reading
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go func() {
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for {
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buf := pool.GetBuf(1450)
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n, remoteAddr, err := readConn.ReadFromUDP(buf)
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if err != nil {
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close(l.acceptCh)
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close(l.writeCh)
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return
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}
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fakeConn, exist := l.fakeConns[remoteAddr.String()]
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if !exist || fakeConn.IsClosed() {
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fakeConn = NewFakeUDPConn(l, l.Addr(), remoteAddr)
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l.fakeConns[remoteAddr.String()] = fakeConn
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}
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fakeConn.putPacket(buf[:n])
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l.acceptCh <- fakeConn
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}
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}()
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// for writing
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go func() {
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for {
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packet, ok := <-l.writeCh
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if !ok {
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return
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}
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if addr, ok := packet.RemoteAddr.(*net.UDPAddr); ok {
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_, _ = readConn.WriteToUDP(packet.Buf, addr)
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}
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}
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}()
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return
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}
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func (l *UDPListener) writeUDPPacket(packet *UDPPacket) (err error) {
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defer func() {
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if errRet := recover(); errRet != nil {
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err = fmt.Errorf("udp write closed listener")
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}
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}()
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l.writeCh <- packet
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return
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}
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func (l *UDPListener) WriteMsg(buf []byte, remoteAddr *net.UDPAddr) (err error) {
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// only set remote addr here
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packet := &UDPPacket{
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Buf: buf,
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RemoteAddr: remoteAddr,
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}
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err = l.writeUDPPacket(packet)
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return
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}
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func (l *UDPListener) Accept() (net.Conn, error) {
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conn, ok := <-l.acceptCh
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if !ok {
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return conn, fmt.Errorf("channel for udp listener closed")
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}
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return conn, nil
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}
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func (l *UDPListener) Close() error {
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if !l.closeFlag {
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l.closeFlag = true
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if l.readConn != nil {
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l.readConn.Close()
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}
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}
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return nil
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}
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func (l *UDPListener) Addr() net.Addr {
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return l.addr
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}
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