addd

_examples/reflect/Makefile

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+# Copyright 2009 The Go Authors. All rights reserved.
+# Use of this source code is governed by a BSD-style
+# license that can be found in the LICENSE file.
+include $(GOROOT)/src/Make.inc
+TARG=reflect
+GOFILES=reflect.go
+include $(GOROOT)/src/Make.cmd

_examples/reflect/reflect.go

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+/* 
+ * A name server which sends back the IP address of its client, the
+ * recursive resolver. When queried for type TXT, it sends back the text
+ * form of the address.  When queried for type A (resp. AAAA), it sends
+ * back the IPv4 (resp. v6) address.
+ * 
+ * Similar services: whoami.ultradns.net, whoami.akamai.net. Also (but it
+ * is not their normal goal): rs.dns-oarc.net, porttest.dns-oarc.net,
+ * amiopen.openresolvers.org.
+ * 
+ * Stephane Bortzmeyer <stephane+grong@bortzmeyer.org>
+ *
+ * Adapted to Go DNS (i.e. completely rewritten)
+ * Miek Gieben <miek@miek.nl>
+ */
+
+package main
+
+import (
+	"net"
+        "time"
+        "strconv"
+	"dns"
+        "dns/responder"
+)
+
+type server responder.Server
+
+func (s *server) ResponderUDP(c *net.UDPConn, a net.Addr, in []byte) {
+        inmsg := new(dns.Msg)
+        if !inmsg.Unpack(in) {
+                // NXdomain 'n stuff
+                println("Unpacking failed")
+        }
+        m := new(dns.Msg)
+        m.MsgHdr.Id = inmsg.MsgHdr.Id
+        m.MsgHdr.Authoritative = true
+        m.MsgHdr.Response = true
+        m.MsgHdr.Opcode = dns.OpcodeQuery
+
+        m.MsgHdr.Rcode = dns.RcodeSuccess
+        m.Question = make([]dns.Question, 1)
+        m.Answer = make([]dns.RR, 1)
+        m.Extra = make([]dns.RR, 1)
+
+        r := new(dns.RR_A)
+        r.Hdr = dns.RR_Header{Name: "whoami.miek.nl.", Rrtype: dns.TypeA, Class: dns.ClassINET, Ttl: 0}
+        ip, _ := net.ResolveUDPAddr(a.String()) // No general variant for both upd and tcp
+        r.A = ip.IP.To4()        // To4 very important
+
+        t := new(dns.RR_TXT)
+        t.Hdr = dns.RR_Header{Name: "whoami.miek.nl.", Rrtype: dns.TypeTXT, Class: dns.ClassINET, Ttl: 0}
+        t.Txt = "Port: " + strconv.Itoa(ip.Port) + " (udp)"
+
+        m.Question[0] = inmsg.Question[0]
+        m.Answer[0] = r
+        m.Extra[0] = t
+        out, b := m.Pack()
+        if !b {
+                println("Failed to pack")
+        }
+        responder.SendUDP(out, c, a)
+}
+
+func (s *server) ResponderTCP(c *net.TCPConn, in []byte) {
+        return
+}
+
+func main() {
+        s := new(responder.Server)
+        s.Address = "127.0.0.1"
+        s.Port = "8053"
+        var srv *server
+        ch := make(chan bool)
+        go s.NewResponder(srv, ch)
+
+        time.Sleep(100 * 1e9)
+
+
+}