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- // Copyright 2011 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.
- package net
- import (
- "encoding/hex"
- "reflect"
- "testing"
- )
- func TestDNSParseSRVReply(t *testing.T) {
- data, err := hex.DecodeString(dnsSRVReply)
- if err != nil {
- t.Fatal(err)
- }
- msg := new(dnsMsg)
- ok := msg.Unpack(data)
- if !ok {
- t.Fatalf("unpacking packet failed")
- }
- msg.String() // exercise this code path
- if g, e := len(msg.answer), 5; g != e {
- t.Errorf("len(msg.answer) = %d; want %d", g, e)
- }
- for idx, rr := range msg.answer {
- if g, e := rr.Header().Rrtype, uint16(dnsTypeSRV); g != e {
- t.Errorf("rr[%d].Header().Rrtype = %d; want %d", idx, g, e)
- }
- if _, ok := rr.(*dnsRR_SRV); !ok {
- t.Errorf("answer[%d] = %T; want *dnsRR_SRV", idx, rr)
- }
- }
- _, addrs, err := answer("_xmpp-server._tcp.google.com.", "foo:53", msg, uint16(dnsTypeSRV))
- if err != nil {
- t.Fatalf("answer: %v", err)
- }
- if g, e := len(addrs), 5; g != e {
- t.Errorf("len(addrs) = %d; want %d", g, e)
- t.Logf("addrs = %#v", addrs)
- }
- // repack and unpack.
- data2, ok := msg.Pack()
- msg2 := new(dnsMsg)
- msg2.Unpack(data2)
- switch {
- case !ok:
- t.Errorf("failed to repack message")
- case !reflect.DeepEqual(msg, msg2):
- t.Errorf("repacked message differs from original")
- }
- }
- func TestDNSParseCorruptSRVReply(t *testing.T) {
- data, err := hex.DecodeString(dnsSRVCorruptReply)
- if err != nil {
- t.Fatal(err)
- }
- msg := new(dnsMsg)
- ok := msg.Unpack(data)
- if !ok {
- t.Fatalf("unpacking packet failed")
- }
- msg.String() // exercise this code path
- if g, e := len(msg.answer), 5; g != e {
- t.Errorf("len(msg.answer) = %d; want %d", g, e)
- }
- for idx, rr := range msg.answer {
- if g, e := rr.Header().Rrtype, uint16(dnsTypeSRV); g != e {
- t.Errorf("rr[%d].Header().Rrtype = %d; want %d", idx, g, e)
- }
- if idx == 4 {
- if _, ok := rr.(*dnsRR_Header); !ok {
- t.Errorf("answer[%d] = %T; want *dnsRR_Header", idx, rr)
- }
- } else {
- if _, ok := rr.(*dnsRR_SRV); !ok {
- t.Errorf("answer[%d] = %T; want *dnsRR_SRV", idx, rr)
- }
- }
- }
- _, addrs, err := answer("_xmpp-server._tcp.google.com.", "foo:53", msg, uint16(dnsTypeSRV))
- if err != nil {
- t.Fatalf("answer: %v", err)
- }
- if g, e := len(addrs), 4; g != e {
- t.Errorf("len(addrs) = %d; want %d", g, e)
- t.Logf("addrs = %#v", addrs)
- }
- }
- // Valid DNS SRV reply
- const dnsSRVReply = "0901818000010005000000000c5f786d70702d736572766572045f74637006676f6f67" +
- "6c6503636f6d0000210001c00c002100010000012c00210014000014950c786d70702d" +
- "73657276657234016c06676f6f676c6503636f6d00c00c002100010000012c00210014" +
- "000014950c786d70702d73657276657232016c06676f6f676c6503636f6d00c00c0021" +
- "00010000012c00210014000014950c786d70702d73657276657233016c06676f6f676c" +
- "6503636f6d00c00c002100010000012c00200005000014950b786d70702d7365727665" +
- "72016c06676f6f676c6503636f6d00c00c002100010000012c00210014000014950c78" +
- "6d70702d73657276657231016c06676f6f676c6503636f6d00"
- // Corrupt DNS SRV reply, with its final RR having a bogus length
- // (perhaps it was truncated, or it's malicious) The mutation is the
- // capital "FF" below, instead of the proper "21".
- const dnsSRVCorruptReply = "0901818000010005000000000c5f786d70702d736572766572045f74637006676f6f67" +
- "6c6503636f6d0000210001c00c002100010000012c00210014000014950c786d70702d" +
- "73657276657234016c06676f6f676c6503636f6d00c00c002100010000012c00210014" +
- "000014950c786d70702d73657276657232016c06676f6f676c6503636f6d00c00c0021" +
- "00010000012c00210014000014950c786d70702d73657276657233016c06676f6f676c" +
- "6503636f6d00c00c002100010000012c00200005000014950b786d70702d7365727665" +
- "72016c06676f6f676c6503636f6d00c00c002100010000012c00FF0014000014950c78" +
- "6d70702d73657276657231016c06676f6f676c6503636f6d00"
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