mirror of
https://github.com/SagerNet/sing-box.git
synced 2024-11-13 20:33:16 +00:00
109 lines
3.2 KiB
Go
109 lines
3.2 KiB
Go
package inbound
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import (
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"context"
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"net"
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"net/netip"
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"github.com/sagernet/sing-box/adapter"
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"github.com/sagernet/sing-box/common/redir"
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C "github.com/sagernet/sing-box/constant"
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"github.com/sagernet/sing-box/log"
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"github.com/sagernet/sing-box/option"
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"github.com/sagernet/sing/common"
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"github.com/sagernet/sing/common/buf"
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E "github.com/sagernet/sing/common/exceptions"
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M "github.com/sagernet/sing/common/metadata"
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N "github.com/sagernet/sing/common/network"
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"github.com/sagernet/sing/common/udpnat"
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)
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type TProxy struct {
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myInboundAdapter
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udpNat *udpnat.Service[netip.AddrPort]
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}
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func NewTProxy(ctx context.Context, router adapter.Router, logger log.ContextLogger, tag string, options option.TProxyInboundOptions) *TProxy {
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tproxy := &TProxy{
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myInboundAdapter: myInboundAdapter{
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protocol: C.TypeTProxy,
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network: options.Network.Build(),
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ctx: ctx,
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router: router,
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logger: logger,
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tag: tag,
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listenOptions: options.ListenOptions,
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},
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}
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var udpTimeout int64
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if options.UDPTimeout != 0 {
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udpTimeout = options.UDPTimeout
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} else {
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udpTimeout = 300
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}
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tproxy.connHandler = tproxy
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tproxy.oobPacketHandler = tproxy
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tproxy.udpNat = udpnat.New[netip.AddrPort](udpTimeout, tproxy.upstreamContextHandler())
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tproxy.packetUpstream = tproxy.udpNat
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return tproxy
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}
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func (t *TProxy) Start() error {
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err := t.myInboundAdapter.Start()
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if err != nil {
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return err
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}
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if t.tcpListener != nil {
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tcpFd, err := common.GetFileDescriptor(t.tcpListener)
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if err != nil {
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return err
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}
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err = redir.TProxy(tcpFd, M.SocksaddrFromNet(t.tcpListener.Addr()).Addr.Is6())
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if err != nil {
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return E.Cause(err, "configure tproxy TCP listener")
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}
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}
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if t.udpConn != nil {
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udpFd, err := common.GetFileDescriptor(t.udpConn)
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if err != nil {
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return err
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}
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err = redir.TProxy(udpFd, M.SocksaddrFromNet(t.udpConn.LocalAddr()).Addr.Is6())
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if err != nil {
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return E.Cause(err, "configure tproxy UDP listener")
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}
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}
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return nil
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}
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func (t *TProxy) NewConnection(ctx context.Context, conn net.Conn, metadata adapter.InboundContext) error {
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metadata.Destination = M.SocksaddrFromNet(conn.LocalAddr())
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return t.newConnection(ctx, conn, metadata)
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}
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func (t *TProxy) NewPacket(ctx context.Context, conn N.PacketConn, buffer *buf.Buffer, oob []byte, metadata adapter.InboundContext) error {
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destination, err := redir.GetOriginalDestinationFromOOB(oob)
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if err != nil {
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return E.Cause(err, "get tproxy destination")
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}
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metadata.Destination = M.SocksaddrFromNetIP(destination)
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t.udpNat.NewContextPacket(ctx, metadata.Source.AddrPort(), buffer, adapter.UpstreamMetadata(metadata), func(natConn N.PacketConn) (context.Context, N.PacketWriter) {
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return adapter.WithContext(log.ContextWithNewID(ctx), &metadata), &tproxyPacketWriter{natConn}
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})
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return nil
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}
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type tproxyPacketWriter struct {
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source N.PacketConn
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}
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func (w *tproxyPacketWriter) WritePacket(buffer *buf.Buffer, destination M.Socksaddr) error {
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defer buffer.Release()
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udpConn, err := redir.DialUDP(destination.UDPAddr(), M.SocksaddrFromNet(w.source.LocalAddr()).UDPAddr())
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if err != nil {
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return E.Cause(err, "tproxy udp write back")
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}
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defer udpConn.Close()
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return common.Error(udpConn.Write(buffer.Bytes()))
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}
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