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