79 lines
1.4 KiB
Go
79 lines
1.4 KiB
Go
package redir
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import (
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"net"
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adapters "github.com/Dreamacro/clash/adapters/inbound"
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"github.com/Dreamacro/clash/common/pool"
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"github.com/Dreamacro/clash/component/socks5"
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C "github.com/Dreamacro/clash/constant"
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"github.com/Dreamacro/clash/tunnel"
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)
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type RedirUDPListener struct {
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net.PacketConn
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address string
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closed bool
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}
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func NewRedirUDPProxy(addr string) (*RedirUDPListener, error) {
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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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rl := &RedirUDPListener{l, addr, false}
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c := l.(*net.UDPConn)
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rc, err := c.SyscallConn()
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if err != nil {
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return nil, err
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}
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err = setsockopt(rc, addr)
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if err != nil {
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return nil, err
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}
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go func() {
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oob := make([]byte, 1024)
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for {
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buf := pool.Get(pool.RelayBufferSize)
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n, oobn, _, lAddr, err := c.ReadMsgUDP(buf, oob)
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if err != nil {
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pool.Put(buf)
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if rl.closed {
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break
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}
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continue
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}
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rAddr, err := getOrigDst(oob, oobn)
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if err != nil {
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continue
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}
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handleRedirUDP(l, buf[:n], lAddr, rAddr)
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}
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}()
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return rl, nil
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}
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func (l *RedirUDPListener) 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 (l *RedirUDPListener) Address() string {
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return l.address
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}
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func handleRedirUDP(pc net.PacketConn, buf []byte, lAddr *net.UDPAddr, rAddr *net.UDPAddr) {
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target := socks5.ParseAddrToSocksAddr(rAddr)
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pkt := &packet{
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lAddr: lAddr,
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buf: buf,
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}
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tunnel.AddPacket(adapters.NewPacket(target, pkt, C.TPROXY))
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}
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