/
dnstap.go
66 lines (58 loc) · 1.71 KB
/
dnstap.go
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package forward
import (
"context"
"net"
"strconv"
"time"
"github.com/khulnasoft-lab/dnserver/plugin/dnstap/msg"
"github.com/khulnasoft-lab/dnserver/plugin/pkg/proxy"
"github.com/khulnasoft-lab/dnserver/request"
tap "github.com/dnstap/golang-dnstap"
"github.com/miekg/dns"
)
// toDnstap will send the forward and received message to the dnstap plugin.
func toDnstap(ctx context.Context, f *Forward, host string, state request.Request, opts proxy.Options, reply *dns.Msg, start time.Time) {
h, p, _ := net.SplitHostPort(host) // this is preparsed and can't err here
port, _ := strconv.ParseUint(p, 10, 32) // same here
ip := net.ParseIP(h)
var ta net.Addr = &net.UDPAddr{IP: ip, Port: int(port)}
t := state.Proto()
switch {
case opts.ForceTCP:
t = "tcp"
case opts.PreferUDP:
t = "udp"
}
if t == "tcp" {
ta = &net.TCPAddr{IP: ip, Port: int(port)}
}
for _, t := range f.tapPlugins {
// Query
q := new(tap.Message)
msg.SetQueryTime(q, start)
// Forwarder dnstap messages are from the perspective of the downstream server
// (upstream is the forward server)
msg.SetQueryAddress(q, state.W.RemoteAddr())
msg.SetResponseAddress(q, ta)
if t.IncludeRawMessage {
buf, _ := state.Req.Pack()
q.QueryMessage = buf
}
msg.SetType(q, tap.Message_FORWARDER_QUERY)
t.TapMessageWithMetadata(ctx, q, state)
// Response
if reply != nil {
r := new(tap.Message)
if t.IncludeRawMessage {
buf, _ := reply.Pack()
r.ResponseMessage = buf
}
msg.SetQueryTime(r, start)
msg.SetQueryAddress(r, state.W.RemoteAddr())
msg.SetResponseAddress(r, ta)
msg.SetResponseTime(r, time.Now())
msg.SetType(r, tap.Message_FORWARDER_RESPONSE)
t.TapMessageWithMetadata(ctx, r, state)
}
}
}