sing-box/adapter/inbound.go

package adapter

import (
	"context"
	"net"
	"net/netip"

	"github.com/sagernet/sing-box/common/process"
	"github.com/sagernet/sing-dns"
	M "github.com/sagernet/sing/common/metadata"
	N "github.com/sagernet/sing/common/network"
)

type Inbound interface {
	Service
	Type() string
	Tag() string
}

type InjectableInbound interface {
	Inbound
	Network() []string
	NewConnection(ctx context.Context, conn net.Conn, metadata InboundContext) error
	NewPacketConnection(ctx context.Context, conn N.PacketConn, metadata InboundContext) error
}

type InboundContext struct {
	Inbound     string
	InboundType string
	IPVersion   int
	Network     string
	Source      M.Socksaddr
	Destination M.Socksaddr
	Domain      string
	Protocol    string
	User        string
	Outbound    string

	// cache

	InboundDetour            string
	LastInbound              string
	OriginDestination        M.Socksaddr
	DomainStrategy           dns.DomainStrategy
	SniffEnabled             bool
	SniffOverrideDestination bool
	DestinationAddresses     []netip.Addr
	SourceGeoIPCode          string
	GeoIPCode                string
	ProcessInfo              *process.Info
}

type inboundContextKey struct{}

func WithContext(ctx context.Context, inboundContext *InboundContext) context.Context {
	return context.WithValue(ctx, (*inboundContextKey)(nil), inboundContext)
}

func ContextFrom(ctx context.Context) *InboundContext {
	metadata := ctx.Value((*inboundContextKey)(nil))
	if metadata == nil {
		return nil
	}
	return metadata.(*InboundContext)
}

func AppendContext(ctx context.Context) (context.Context, *InboundContext) {
	metadata := ContextFrom(ctx)
	if metadata != nil {
		return ctx, metadata
	}
	metadata = new(InboundContext)
	return WithContext(ctx, metadata), metadata
}