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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,91 @@ | ||
| package route | ||
|
|
||
| import ( | ||
| "context" | ||
| "net" | ||
| "time" | ||
|
|
||
| "github.com/sagernet/sing-box/adapter" | ||
| C "github.com/sagernet/sing-box/constant" | ||
| "github.com/sagernet/sing-box/outbound" | ||
| "github.com/sagernet/sing-dns" | ||
| "github.com/sagernet/sing/common/buf" | ||
| E "github.com/sagernet/sing/common/exceptions" | ||
| M "github.com/sagernet/sing/common/metadata" | ||
| N "github.com/sagernet/sing/common/network" | ||
| "github.com/sagernet/sing/common/udpnat2" | ||
|
|
||
| mDNS "github.com/miekg/dns" | ||
| ) | ||
|
|
||
| func (r *Router) hijackDNSStream(ctx context.Context, conn net.Conn, metadata adapter.InboundContext) error { | ||
| metadata.Destination = M.Socksaddr{} | ||
| for { | ||
| conn.SetReadDeadline(time.Now().Add(C.DNSTimeout)) | ||
| err := outbound.HandleStreamDNSRequest(ctx, r, conn, metadata) | ||
| if err != nil { | ||
| return err | ||
| } | ||
| } | ||
| } | ||
|
|
||
| func (r *Router) hijackDNSPacket(ctx context.Context, conn N.PacketConn, packetBuffers []*N.PacketBuffer, metadata adapter.InboundContext) { | ||
| if uConn, isUDPNAT2 := conn.(*udpnat.Conn); isUDPNAT2 { | ||
| metadata.Destination = M.Socksaddr{} | ||
| for _, packet := range packetBuffers { | ||
| buffer := packet.Buffer | ||
| destination := packet.Destination | ||
| N.PutPacketBuffer(packet) | ||
| go ExchangeDNSPacket(ctx, r, uConn, buffer, metadata, destination) | ||
| } | ||
| uConn.SetHandler(&dnsHijacker{ | ||
| router: r, | ||
| conn: conn, | ||
| ctx: ctx, | ||
| metadata: metadata, | ||
| }) | ||
| return | ||
| } | ||
| err := outbound.NewDNSPacketConnection(ctx, r, conn, packetBuffers, metadata) | ||
| if err != nil && !E.IsClosedOrCanceled(err) { | ||
| r.dnsLogger.ErrorContext(ctx, E.Cause(err, "process packet connection")) | ||
| } | ||
| } | ||
|
|
||
| func ExchangeDNSPacket(ctx context.Context, router *Router, conn N.PacketConn, buffer *buf.Buffer, metadata adapter.InboundContext, destination M.Socksaddr) { | ||
| err := exchangeDNSPacket(ctx, router, conn, buffer, metadata, destination) | ||
| if err != nil && !E.IsClosedOrCanceled(err) { | ||
| router.dnsLogger.ErrorContext(ctx, E.Cause(err, "process packet connection")) | ||
| } | ||
| } | ||
|
|
||
| func exchangeDNSPacket(ctx context.Context, router *Router, conn N.PacketConn, buffer *buf.Buffer, metadata adapter.InboundContext, destination M.Socksaddr) error { | ||
| var message mDNS.Msg | ||
| err := message.Unpack(buffer.Bytes()) | ||
| buffer.Release() | ||
| if err != nil { | ||
| return E.Cause(err, "unpack request") | ||
| } | ||
| response, err := router.Exchange(adapter.WithContext(ctx, &metadata), &message) | ||
| if err != nil { | ||
| return err | ||
| } | ||
| responseBuffer, err := dns.TruncateDNSMessage(&message, response, 1024) | ||
| if err != nil { | ||
| return err | ||
| } | ||
| err = conn.WritePacket(responseBuffer, destination) | ||
| responseBuffer.Release() | ||
| return err | ||
| } | ||
|
|
||
| type dnsHijacker struct { | ||
| router *Router | ||
| conn N.PacketConn | ||
| ctx context.Context | ||
| metadata adapter.InboundContext | ||
| } | ||
|
|
||
| func (h *dnsHijacker) NewPacketEx(buffer *buf.Buffer, destination M.Socksaddr) { | ||
| go ExchangeDNSPacket(h.ctx, h.router, h.conn, buffer, h.metadata, destination) | ||
| } |
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