fc667b98e0
* Fix EDNS0 compliance Do SizeAndDo in the server (ScrubWriter) and remove all uses of this from the plugins. Also *always* do it. This is to get into compliance for https://dnsflagday.net/. The pkg/edns0 now exports the EDNS0 options we understand; this is exported to allow plugins add things there. The *rewrite* plugin used this to add custom EDNS0 option codes that the server needs to understand. This also needs a new release of miekg/dns because it triggered a race-condition that was basicly there forever. See: * https://github.com/miekg/dns/issues/857 * https://github.com/miekg/dns/pull/859 Running a test instance and pointing the https://ednscomp.isc.org/ednscomp to it shows the tests are now fixed: ~~~ EDNS Compliance Tester Checking: 'miek.nl' as at 2018-12-01T17:53:15Z miek.nl. @147.75.204.203 (drone.coredns.io.): dns=ok edns=ok edns1=ok edns@512=ok ednsopt=ok edns1opt=ok do=ok ednsflags=ok docookie=ok edns512tcp=ok optlist=ok miek.nl. @2604:1380:2002:a000::1 (drone.coredns.io.): dns=ok edns=ok edns1=ok edns@512=ok ednsopt=ok edns1opt=ok do=ok ednsflags=ok docookie=ok edns512tcp=ok optlist=ok All Ok Codes ok - test passed. ~~~ Signed-off-by: Miek Gieben <miek@miek.nl> Signed-off-by: Miek Gieben <miek@miek.nl> * typos in comments Signed-off-by: Miek Gieben <miek@miek.nl>
58 lines
1.4 KiB
Go
58 lines
1.4 KiB
Go
// Package whoami implements a plugin that returns details about the resolving
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// querying it.
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package whoami
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import (
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"context"
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"net"
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"strconv"
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"github.com/coredns/coredns/request"
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"github.com/miekg/dns"
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)
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// Whoami is a plugin that returns your IP address, port and the protocol used for connecting
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// to CoreDNS.
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type Whoami struct{}
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// ServeDNS implements the plugin.Handler interface.
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func (wh Whoami) ServeDNS(ctx context.Context, w dns.ResponseWriter, r *dns.Msg) (int, error) {
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state := request.Request{W: w, Req: r}
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a := new(dns.Msg)
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a.SetReply(r)
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a.Authoritative = true
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ip := state.IP()
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var rr dns.RR
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switch state.Family() {
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case 1:
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rr = new(dns.A)
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rr.(*dns.A).Hdr = dns.RR_Header{Name: state.QName(), Rrtype: dns.TypeA, Class: state.QClass()}
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rr.(*dns.A).A = net.ParseIP(ip).To4()
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case 2:
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rr = new(dns.AAAA)
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rr.(*dns.AAAA).Hdr = dns.RR_Header{Name: state.QName(), Rrtype: dns.TypeAAAA, Class: state.QClass()}
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rr.(*dns.AAAA).AAAA = net.ParseIP(ip)
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}
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srv := new(dns.SRV)
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srv.Hdr = dns.RR_Header{Name: "_" + state.Proto() + "." + state.QName(), Rrtype: dns.TypeSRV, Class: state.QClass()}
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if state.QName() == "." {
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srv.Hdr.Name = "_" + state.Proto() + state.QName()
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}
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port, _ := strconv.Atoi(state.Port())
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srv.Port = uint16(port)
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srv.Target = "."
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a.Extra = []dns.RR{rr, srv}
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w.WriteMsg(a)
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return 0, nil
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}
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// Name implements the Handler interface.
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func (wh Whoami) Name() string { return "whoami" }
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