mirror of
https://github.com/SagerNet/sing-box.git
synced 2024-11-22 08:31:30 +00:00
92 lines
2.8 KiB
Go
92 lines
2.8 KiB
Go
package route
|
|
|
|
import (
|
|
"context"
|
|
"net"
|
|
"time"
|
|
|
|
"github.com/sagernet/sing-box/adapter"
|
|
C "github.com/sagernet/sing-box/constant"
|
|
dnsOutbound "github.com/sagernet/sing-box/protocol/dns"
|
|
"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 := dnsOutbound.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 := dnsOutbound.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)
|
|
}
|