mirror of
https://github.com/SagerNet/sing-box.git
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112 lines
3.6 KiB
Go
112 lines
3.6 KiB
Go
package inbound
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import (
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"context"
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"net"
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"time"
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"github.com/sagernet/sing-box/adapter"
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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/buf"
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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/udpnat2"
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)
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var _ adapter.Inbound = (*Direct)(nil)
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type Direct struct {
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myInboundAdapter
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udpNat *udpnat.Service
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overrideOption int
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overrideDestination M.Socksaddr
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}
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func NewDirect(ctx context.Context, router adapter.Router, logger log.ContextLogger, tag string, options option.DirectInboundOptions) *Direct {
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options.UDPFragmentDefault = true
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inbound := &Direct{
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myInboundAdapter: myInboundAdapter{
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protocol: C.TypeDirect,
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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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if options.OverrideAddress != "" && options.OverridePort != 0 {
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inbound.overrideOption = 1
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inbound.overrideDestination = M.ParseSocksaddrHostPort(options.OverrideAddress, options.OverridePort)
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} else if options.OverrideAddress != "" {
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inbound.overrideOption = 2
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inbound.overrideDestination = M.ParseSocksaddrHostPort(options.OverrideAddress, options.OverridePort)
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} else if options.OverridePort != 0 {
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inbound.overrideOption = 3
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inbound.overrideDestination = M.Socksaddr{Port: options.OverridePort}
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}
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var udpTimeout time.Duration
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if options.UDPTimeout != 0 {
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udpTimeout = time.Duration(options.UDPTimeout)
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} else {
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udpTimeout = C.UDPTimeout
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}
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inbound.udpNat = udpnat.New(inbound, inbound.preparePacketConnection, udpTimeout, false)
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inbound.connHandler = inbound
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inbound.packetHandler = inbound
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return inbound
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}
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func (d *Direct) NewConnection(ctx context.Context, conn net.Conn, metadata adapter.InboundContext) error {
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switch d.overrideOption {
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case 1:
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metadata.Destination = d.overrideDestination
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case 2:
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destination := d.overrideDestination
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destination.Port = metadata.Destination.Port
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metadata.Destination = destination
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case 3:
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metadata.Destination.Port = d.overrideDestination.Port
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}
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d.logger.InfoContext(ctx, "inbound connection to ", metadata.Destination)
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return d.router.RouteConnection(ctx, conn, metadata)
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}
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func (d *Direct) NewPacketEx(buffer *buf.Buffer, source M.Socksaddr) {
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var destination M.Socksaddr
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switch d.overrideOption {
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case 1:
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destination = d.overrideDestination
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case 2:
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destination = d.overrideDestination
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destination.Port = source.Port
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case 3:
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destination = source
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destination.Port = d.overrideDestination.Port
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}
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d.udpNat.NewPacket([][]byte{buffer.Bytes()}, source, destination, nil)
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}
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func (d *Direct) NewConnectionEx(ctx context.Context, conn net.Conn, metadata adapter.InboundContext, onClose N.CloseHandlerFunc) {
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d.newConnectionEx(ctx, conn, metadata, onClose)
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}
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func (d *Direct) NewPacketConnectionEx(ctx context.Context, conn N.PacketConn, source M.Socksaddr, destination M.Socksaddr, onClose N.CloseHandlerFunc) {
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d.newPacketConnectionEx(ctx, conn, d.createPacketMetadataEx(source, destination), onClose)
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}
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func (d *Direct) preparePacketConnection(source M.Socksaddr, destination M.Socksaddr, userData any) (bool, context.Context, N.PacketWriter, N.CloseHandlerFunc) {
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return true, d.ctx, &directPacketWriter{d.packetConn(), source}, nil
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}
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type directPacketWriter struct {
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writer N.PacketWriter
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source M.Socksaddr
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}
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func (w *directPacketWriter) WritePacket(buffer *buf.Buffer, addr M.Socksaddr) error {
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return w.writer.WritePacket(buffer, w.source)
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}
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