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package forward
import (
"net"
"strconv"
"time"
"github.com/coredns/coredns/plugin/dnstap/msg"
"github.com/coredns/coredns/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(f *Forward, host string, state request.Request, opts options, reply *dns.Msg, start time.Time) {
// Query
q := new(tap.Message)
msg.SetQueryTime(q, start)
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)}
}
// 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 f.tapPlugin.IncludeRawMessage {
buf, _ := state.Req.Pack()
q.QueryMessage = buf
}
msg.SetType(q, tap.Message_FORWARDER_QUERY)
f.tapPlugin.TapMessage(q)
// Response
if reply != nil {
r := new(tap.Message)
if f.tapPlugin.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)
f.tapPlugin.TapMessage(r)
}
}
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