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// Package whoami implements a plugin that returns details about the resolving
// querying it.
package whoami
import (
"context"
"net"
"strconv"
"github.com/coredns/coredns/request"
"github.com/miekg/dns"
)
const name = "whoami"
// Whoami is a plugin that returns your IP address, port and the protocol used for connecting
// to CoreDNS.
type Whoami struct{}
// ServeDNS implements the plugin.Handler interface.
func (wh Whoami) ServeDNS(ctx context.Context, w dns.ResponseWriter, r *dns.Msg) (int, error) {
state := request.Request{W: w, Req: r}
a := new(dns.Msg)
a.SetReply(r)
a.Authoritative = true
ip := state.IP()
var rr dns.RR
switch state.Family() {
case 1:
rr = new(dns.A)
rr.(*dns.A).Hdr = dns.RR_Header{Name: state.QName(), Rrtype: dns.TypeA, Class: state.QClass()}
rr.(*dns.A).A = net.ParseIP(ip).To4()
case 2:
rr = new(dns.AAAA)
rr.(*dns.AAAA).Hdr = dns.RR_Header{Name: state.QName(), Rrtype: dns.TypeAAAA, Class: state.QClass()}
rr.(*dns.AAAA).AAAA = net.ParseIP(ip)
}
srv := new(dns.SRV)
srv.Hdr = dns.RR_Header{Name: "_" + state.Proto() + "." + state.QName(), Rrtype: dns.TypeSRV, Class: state.QClass()}
if state.QName() == "." {
srv.Hdr.Name = "_" + state.Proto() + state.QName()
}
port, _ := strconv.Atoi(state.Port())
srv.Port = uint16(port)
srv.Target = "."
a.Extra = []dns.RR{rr, srv}
w.WriteMsg(a)
return 0, nil
}
// Name implements the Handler interface.
func (wh Whoami) Name() string { return name }
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