76 lines
1.6 KiB
Go
76 lines
1.6 KiB
Go
package shadowsocks
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import (
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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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"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/shadowsocks/core"
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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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closed bool
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}
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func NewUDP(addr string, pickCipher core.Cipher, in chan<- *C.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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err = sockopt.UDPReuseaddr(l.(*net.UDPConn))
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if 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{l, false}
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conn := pickCipher.PacketConn(l)
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go func() {
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for {
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buf := pool.Get(pool.RelayBufferSize)
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n, remoteAddr, err := conn.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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handleSocksUDP(conn, 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 *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 handleSocksUDP(pc net.PacketConn, in chan<- *C.PacketAdapter, buf []byte, addr net.Addr) {
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tgtAddr := socks5.SplitAddr(buf)
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if tgtAddr == nil {
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// Unresolved UDP packet, return buffer to the pool
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pool.Put(buf)
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return
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}
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target := socks5.ParseAddr(tgtAddr.String())
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payload := buf[len(tgtAddr):]
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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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bufRef: buf,
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}
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select {
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case in <- inbound.NewPacket(target, packet, C.SHADOWSOCKS):
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default:
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}
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}
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