mirror of
https://github.com/miekg/dns.git
synced 2025-11-04 04:31:01 +01:00
66 lines
1.7 KiB
Go
66 lines
1.7 KiB
Go
/*
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* A name server which sends back the IP address of its client, the
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* recursive resolver. When queried for type TXT, it sends back the text
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* form of the address. When queried for type A (resp. AAAA), it sends
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* back the IPv4 (resp. v6) address.
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*
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* Similar services: whoami.ultradns.net, whoami.akamai.net. Also (but it
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* is not their normal goal): rs.dns-oarc.net, porttest.dns-oarc.net,
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* amiopen.openresolvers.org.
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*
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* Stephane Bortzmeyer <stephane+grong@bortzmeyer.org>
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*
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* Adapted to Go DNS (i.e. completely rewritten)
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* Miek Gieben <miek@miek.nl>
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*/
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package main
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import (
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"net"
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"dns"
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"fmt"
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// "os"
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// "os/signal"
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// "strconv"
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)
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func handleReflect(w dns.ResponseWriter, r *dns.Msg) {
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m := new(dns.Msg)
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m.SetReply(r)
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m.Extra = make([]dns.RR, 1)
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// m.Answer = make([]dns.RR, 1)
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println(w.RemoteAddr())
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ad := net.ParseIP(w.RemoteAddr())
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println(ad.String())
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// if ad.To4() != nil {
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// rr := new(dns.RR_A)
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// rr.Hdr = dns.RR_Header{Name: "whoami.miek.nl.", Rrtype: dns.TypeA, Class: dns.ClassINET, Ttl: 0}
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// rr.A = ad
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// m.Answer[0] = rr
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// } else {
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// r := new(dns.RR_AAAA)
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// r.Hdr = dns.RR_Header{Name: "whoami.miek.nl.", Rrtype: dns.TypeAAAA, Class: dns.ClassINET, Ttl: 0}
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// r.AAAA = ad
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// m.Answer[0] = r
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// }
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t := new(dns.RR_TXT)
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t.Hdr = dns.RR_Header{Name: "whoami.miek.nl.", Rrtype: dns.TypeTXT, Class: dns.ClassINET, Ttl: 0}
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// t.Txt = "Port: " + strconv.Itoa(w.RemotePort()) + " (" + w.RemoteTransport() + ")"
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t.Txt = "Port: " + " (" + w.RemoteTransport() + ")"
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m.Extra[0] = t
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b, _ := m.Pack()
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w.Write(b)
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}
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func main() {
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dns.HandleFunc(".", handleReflect)
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err := dns.ListenAndServe(":8053", "udp", nil)
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if err != nil {
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fmt.Printf("Failed to setup the server")
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}
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}
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