92 lines
2 KiB
Go
92 lines
2 KiB
Go
package socks
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import (
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"net"
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"github.com/Dreamacro/clash/adapter/inbound"
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N "github.com/Dreamacro/clash/common/net"
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"github.com/Dreamacro/clash/common/sockopt"
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C "github.com/Dreamacro/clash/constant"
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"github.com/Dreamacro/clash/log"
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"github.com/Dreamacro/clash/transport/socks5"
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)
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type UDPListener struct {
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packetConn net.PacketConn
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addr string
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closed bool
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}
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// RawAddress implements C.Listener
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func (l *UDPListener) RawAddress() string {
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return l.addr
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}
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// Address implements C.Listener
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func (l *UDPListener) Address() string {
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return l.packetConn.LocalAddr().String()
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}
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// Close implements C.Listener
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func (l *UDPListener) Close() error {
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l.closed = true
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return l.packetConn.Close()
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}
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func NewUDP(addr string, tunnel C.Tunnel, additions ...inbound.Addition) (*UDPListener, error) {
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if len(additions) == 0 {
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additions = []inbound.Addition{
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inbound.WithInName("DEFAULT-SOCKS"),
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inbound.WithSpecialRules(""),
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}
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}
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l, err := net.ListenPacket("udp", addr)
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if err != nil {
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return nil, err
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}
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if err := sockopt.UDPReuseaddr(l.(*net.UDPConn)); err != nil {
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log.Warnln("Failed to Reuse UDP Address: %s", err)
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}
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sl := &UDPListener{
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packetConn: l,
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addr: addr,
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}
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conn := N.NewEnhancePacketConn(l)
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go func() {
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for {
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data, put, remoteAddr, err := conn.WaitReadFrom()
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if err != nil {
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if put != nil {
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put()
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}
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if sl.closed {
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break
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}
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continue
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}
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handleSocksUDP(l, tunnel, data, put, remoteAddr, additions...)
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}
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}()
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return sl, nil
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}
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func handleSocksUDP(pc net.PacketConn, tunnel C.Tunnel, buf []byte, put func(), addr net.Addr, additions ...inbound.Addition) {
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target, payload, err := socks5.DecodeUDPPacket(buf)
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if err != nil {
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// Unresolved UDP packet, return buffer to the pool
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if put != nil {
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put()
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}
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return
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}
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packet := &packet{
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pc: pc,
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rAddr: addr,
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payload: payload,
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put: put,
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}
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tunnel.HandleUDPPacket(inbound.NewPacket(target, packet, C.SOCKS5, additions...))
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}
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