98 lines
1.8 KiB
Go
98 lines
1.8 KiB
Go
package tproxy
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import (
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"net"
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"net/netip"
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"github.com/Dreamacro/clash/adapter/inbound"
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"github.com/Dreamacro/clash/common/pool"
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C "github.com/Dreamacro/clash/constant"
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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, in chan<- *inbound.PacketAdapter) (*UDPListener, 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 := &UDPListener{
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packetConn: l,
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addr: addr,
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}
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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.UDPBufferSize)
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n, oobn, _, lAddr, err := c.ReadMsgUDPAddrPort(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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if rAddr.Addr().Is4() {
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// try to unmap 4in6 address
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lAddr = netip.AddrPortFrom(lAddr.Addr().Unmap(), lAddr.Port())
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}
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handlePacketConn(l, in, 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 handlePacketConn(pc net.PacketConn, in chan<- *inbound.PacketAdapter, buf []byte, lAddr, rAddr netip.AddrPort) {
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target := socks5.AddrFromStdAddrPort(rAddr)
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pkt := &packet{
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pc: pc,
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lAddr: lAddr,
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buf: buf,
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}
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select {
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case in <- inbound.NewPacket(target, pkt, C.TPROXY):
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default:
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}
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}
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