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https://github.com/coredns/coredns.git
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30fd224504
Add a new middleware that tells you who you are; IP, port and transport is echoed back. Also some various cleanup and documentation improvements while at it: * ResponseWriter: improve the documentation of these helper functions. * And add an NextHandler for use in tests. Make chaos_test.go and * whoam_test.go use it.
51 lines
1.1 KiB
Go
51 lines
1.1 KiB
Go
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/middleware"
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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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type Whoami struct {
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Next middleware.Handler
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}
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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: state.QType(), 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: state.QType(), 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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a.Extra = append(a.Extra, rr)
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a.Extra = append(a.Extra, srv)
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w.WriteMsg(a)
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return 0, nil
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}
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