86 lines
1.6 KiB
Go
86 lines
1.6 KiB
Go
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package tunnel
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import (
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"fmt"
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"net"
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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 PacketConn struct {
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conn net.PacketConn
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addr string
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target socks5.Addr
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proxy 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 *PacketConn) 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 *PacketConn) Address() string {
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return l.conn.LocalAddr().String()
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}
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// Close implements C.Listener
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func (l *PacketConn) Close() error {
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l.closed = true
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return l.conn.Close()
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}
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func NewUDP(addr, target, proxy string, in chan<- *inbound.PacketAdapter) (*PacketConn, 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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targetAddr := socks5.ParseAddr(target)
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if targetAddr == nil {
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return nil, fmt.Errorf("invalid target address %s", target)
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}
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sl := &PacketConn{
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conn: l,
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target: targetAddr,
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proxy: proxy,
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addr: addr,
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}
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go func() {
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for {
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buf := pool.Get(pool.UDPBufferSize)
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n, remoteAddr, err := l.ReadFrom(buf)
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if err != nil {
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pool.Put(buf)
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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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sl.handleUDP(l, in, buf[:n], remoteAddr)
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}
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}()
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return sl, nil
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}
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func (l *PacketConn) handleUDP(pc net.PacketConn, in chan<- *inbound.PacketAdapter, buf []byte, addr net.Addr) {
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packet := &packet{
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pc: pc,
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rAddr: addr,
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payload: buf,
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}
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ctx := inbound.NewPacket(l.target, packet, C.TUNNEL)
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ctx.Metadata().SpecialProxy = l.proxy
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select {
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case in <- ctx:
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default:
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}
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}
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