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Improve tproxy udp write back

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This commit is contained in:
世界 2022-08-16 18:37:37 +08:00
parent 835ae1217b
commit ca94a2ddcb
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GPG Key ID: CD109927C34A63C4
1 changed files with 32 additions and 16 deletions
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40
inbound/tproxy.go
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@ -12,6 +12,7 @@ import (
"github.com/sagernet/sing-box/option"
"github.com/sagernet/sing/common"
"github.com/sagernet/sing/common/buf"
"github.com/sagernet/sing/common/control"
E "github.com/sagernet/sing/common/exceptions"
M "github.com/sagernet/sing/common/metadata"
N "github.com/sagernet/sing/common/network"
@ -54,21 +55,17 @@ func (t *TProxy) Start() error {
return err
}
if t.tcpListener != nil {
tcpFd, err := common.GetFileDescriptor(t.tcpListener)
if err != nil {
return err
}
err = redir.TProxy(tcpFd, M.SocksaddrFromNet(t.tcpListener.Addr()).Addr.Is6())
err = control.Conn(t.tcpListener, func(fd uintptr) error {
return redir.TProxy(fd, M.SocksaddrFromNet(t.tcpListener.Addr()).Addr.Is6())
})
if err != nil {
return E.Cause(err, "configure tproxy TCP listener")
}
}
if t.udpConn != nil {
udpFd, err := common.GetFileDescriptor(t.udpConn)
if err != nil {
return err
}
err = redir.TProxy(udpFd, M.SocksaddrFromNet(t.udpConn.LocalAddr()).Addr.Is6())
err = control.Conn(t.udpConn, func(fd uintptr) error {
return redir.TProxy(fd, M.SocksaddrFromNet(t.udpConn.LocalAddr()).Addr.Is6())
})
if err != nil {
return E.Cause(err, "configure tproxy UDP listener")
}
@ -88,21 +85,40 @@ func (t *TProxy) NewPacket(ctx context.Context, conn N.PacketConn, buffer *buf.B
}
metadata.Destination = M.SocksaddrFromNetIP(destination)
t.udpNat.NewContextPacket(ctx, metadata.Source.AddrPort(), buffer, adapter.UpstreamMetadata(metadata), func(natConn N.PacketConn) (context.Context, N.PacketWriter) {
return adapter.WithContext(log.ContextWithNewID(ctx), &metadata), &tproxyPacketWriter{natConn}
return adapter.WithContext(log.ContextWithNewID(ctx), &metadata), &tproxyPacketWriter{source: natConn}
})
return nil
}
type tproxyPacketWriter struct {
source N.PacketConn
destination M.Socksaddr
conn *net.UDPConn
}
func (w *tproxyPacketWriter) WritePacket(buffer *buf.Buffer, destination M.Socksaddr) error {
defer buffer.Release()
udpConn, err := redir.DialUDP(destination.UDPAddr(), M.SocksaddrFromNet(w.source.LocalAddr()).UDPAddr())
var udpConn *net.UDPConn
if w.destination == destination {
if w.conn != nil {
udpConn = w.conn
}
}
if udpConn == nil {
var err error
udpConn, err = redir.DialUDP(destination.UDPAddr(), M.SocksaddrFromNet(w.source.LocalAddr()).UDPAddr())
if err != nil {
return E.Cause(err, "tproxy udp write back")
}
if w.destination == destination {
w.conn = udpConn
} else {
defer udpConn.Close()
}
}
return common.Error(udpConn.Write(buffer.Bytes()))
}
func (w *tproxyPacketWriter) Close() error {
return common.Close(common.PtrOrNil(w.conn))
}