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