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c4ab98c6e3
This checks if the next middleware to be called is nil, and if so returns ServerFailure and an error. This makes the next calling more robust and saves some lines of code. Also prefix the error with the name of the middleware to aid in debugging.
58 lines
1.4 KiB
Go
58 lines
1.4 KiB
Go
// Package whoami implements a middleware 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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"net"
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"strconv"
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"github.com/miekg/coredns/request"
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"github.com/miekg/dns"
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"golang.org/x/net/context"
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)
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// Whoami is a middleware 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 middleware.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.Compress = true
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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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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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state.SizeAndDo(a)
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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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