105 lines
3.6 KiB
Go
105 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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"net/netip"
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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/udpnat"
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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[netip.AddrPort]
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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[netip.AddrPort](int64(udpTimeout.Seconds()), adapter.NewUpstreamContextHandler(inbound.newConnection, inbound.newPacketConnection, inbound))
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inbound.connHandler = inbound
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inbound.packetHandler = inbound
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inbound.packetUpstream = inbound.udpNat
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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) NewPacket(ctx context.Context, conn N.PacketConn, buffer *buf.Buffer, 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.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), &udpnat.DirectBackWriter{Source: conn, Nat: natConn}
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})
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return nil
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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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return d.router.RouteConnection(ctx, conn, metadata)
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}
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func (d *Direct) newPacketConnection(ctx context.Context, conn N.PacketConn, metadata adapter.InboundContext) error {
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ctx = log.ContextWithNewID(ctx)
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d.logger.InfoContext(ctx, "inbound packet connection from ", metadata.Source)
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return d.router.RoutePacketConnection(ctx, conn, metadata)
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}
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