sing-box/inbound/direct.go

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package inbound
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import (
"context"
"net"
"net/netip"
"github.com/sagernet/sing-box/adapter"
C "github.com/sagernet/sing-box/constant"
"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"
M "github.com/sagernet/sing/common/metadata"
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 {
myInboundAdapter
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udpNat *udpnat.Service[netip.AddrPort]
overrideOption int
overrideDestination M.Socksaddr
}
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func NewDirect(ctx context.Context, router adapter.Router, logger log.Logger, tag string, options option.DirectInboundOptions) *Direct {
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inbound := &Direct{
myInboundAdapter: myInboundAdapter{
protocol: C.TypeDirect,
network: options.Network.Build(),
ctx: ctx,
router: router,
logger: logger,
tag: tag,
listenOptions: options.ListenOptions,
},
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}
if options.OverrideAddress != "" && options.OverridePort != 0 {
inbound.overrideOption = 1
inbound.overrideDestination = M.ParseSocksaddrHostPort(options.OverrideAddress, options.OverridePort)
} else if options.OverrideAddress != "" {
inbound.overrideOption = 2
inbound.overrideDestination = M.ParseSocksaddrHostPort(options.OverrideAddress, options.OverridePort)
} else if options.OverridePort != 0 {
inbound.overrideOption = 3
inbound.overrideDestination = M.Socksaddr{Port: options.OverridePort}
}
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inbound.udpNat = udpnat.New[netip.AddrPort](options.UDPTimeout, inbound.upstreamContextHandler())
inbound.connHandler = inbound
inbound.packetHandler = inbound
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 {
case 1:
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metadata.Destination = d.overrideDestination
case 2:
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destination := d.overrideDestination
destination.Port = metadata.Destination.Port
metadata.Destination = destination
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case 3:
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metadata.Destination.Port = d.overrideDestination.Port
}
d.logger.WithContext(ctx).Info("inbound connection to ", metadata.Destination)
return d.router.RouteConnection(ctx, conn, metadata)
}
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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 {
case 1:
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metadata.Destination = d.overrideDestination
case 2:
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destination := d.overrideDestination
destination.Port = metadata.Destination.Port
metadata.Destination = destination
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case 3:
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metadata.Destination.Port = d.overrideDestination.Port
}
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d.udpNat.NewPacketDirect(adapter.ContextWithMetadata(log.ContextWithID(ctx), metadata), metadata.Source.AddrPort(), conn, buffer, adapter.UpstreamMetadata(metadata))
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return nil
}