Golang程序
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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 TestStructPackUnpack(t *testing.T) {
want := dnsQuestion{
Name: ".",
Qtype: dnsTypeA,
Qclass: dnsClassINET,
}
buf := make([]byte, 50)
n, ok := packStruct(&want, buf, 0)
if !ok {
t.Fatal("packing failed")
}
buf = buf[:n]
got := dnsQuestion{}
n, ok = unpackStruct(&got, buf, 0)
if !ok {
t.Fatal("unpacking failed")
}
if n != len(buf) {
t.Errorf("unpacked different amount than packed: got n = %d, want = %d", n, len(buf))
}
if !reflect.DeepEqual(got, want) {
t.Errorf("got = %+v, want = %+v", got, want)
}
}
func TestDomainNamePackUnpack(t *testing.T) {
tests := []struct {
in string
want string
ok bool
}{
{"", ".", true},
{".", ".", true},
{"google..com", "", false},
{"google.com", "google.com.", true},
{"google..com.", "", false},
{"google.com.", "google.com.", true},
{".google.com.", "", false},
{"www..google.com.", "", false},
{"www.google.com.", "www.google.com.", true},
}
for _, test := range tests {
buf := make([]byte, 30)
n, ok := packDomainName(test.in, buf, 0)
if ok != test.ok {
t.Errorf("packing of %s: got ok = %t, want = %t", test.in, ok, test.ok)
continue
}
if !test.ok {
continue
}
buf = buf[:n]
got, n, ok := unpackDomainName(buf, 0)
if !ok {
t.Errorf("unpacking for %s failed", test.in)
continue
}
if n != len(buf) {
t.Errorf(
"unpacked different amount than packed for %s: got n = %d, want = %d",
test.in,
n,
len(buf),
)
}
if got != test.want {
t.Errorf("unpacking packing of %s: got = %s, want = %s", test.in, got, test.want)
}
}
}
func TestDNSPackUnpack(t *testing.T) {
want := dnsMsg{
question: []dnsQuestion{{
Name: ".",
Qtype: dnsTypeAAAA,
Qclass: dnsClassINET,
}},
answer: []dnsRR{},
ns: []dnsRR{},
extra: []dnsRR{},
}
b, ok := want.Pack()
if !ok {
t.Fatal("packing failed")
}
var got dnsMsg
ok = got.Unpack(b)
if !ok {
t.Fatal("unpacking failed")
}
if !reflect.DeepEqual(got, want) {
t.Errorf("got = %+v, want = %+v", got, want)
}
}
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.Fatal("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)
}
}
for _, name := range [...]string{
"_xmpp-server._tcp.google.com.",
"_XMPP-Server._TCP.Google.COM.",
"_XMPP-SERVER._TCP.GOOGLE.COM.",
} {
_, addrs, err := answer(name, "foo:53", msg, uint16(dnsTypeSRV))
if err != nil {
t.Error(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.Error("failed to repack message")
case !reflect.DeepEqual(msg, msg2):
t.Error("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.Fatal("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)
}
}
func TestDNSParseTXTReply(t *testing.T) {
expectedTxt1 := "v=spf1 redirect=_spf.google.com"
expectedTxt2 := "v=spf1 ip4:69.63.179.25 ip4:69.63.178.128/25 ip4:69.63.184.0/25 " +
"ip4:66.220.144.128/25 ip4:66.220.155.0/24 " +
"ip4:69.171.232.0/25 ip4:66.220.157.0/25 " +
"ip4:69.171.244.0/24 mx -all"
replies := []string{dnsTXTReply1, dnsTXTReply2}
expectedTxts := []string{expectedTxt1, expectedTxt2}
for i := range replies {
data, err := hex.DecodeString(replies[i])
if err != nil {
t.Fatal(err)
}
msg := new(dnsMsg)
ok := msg.Unpack(data)
if !ok {
t.Errorf("test %d: unpacking packet failed", i)
continue
}
if len(msg.answer) != 1 {
t.Errorf("test %d: len(rr.answer) = %d; want 1", i, len(msg.answer))
continue
}
rr := msg.answer[0]
rrTXT, ok := rr.(*dnsRR_TXT)
if !ok {
t.Errorf("test %d: answer[0] = %T; want *dnsRR_TXT", i, rr)
continue
}
if rrTXT.Txt != expectedTxts[i] {
t.Errorf("test %d: Txt = %s; want %s", i, rrTXT.Txt, expectedTxts[i])
}
}
}
func TestDNSParseTXTCorruptDataLengthReply(t *testing.T) {
replies := []string{dnsTXTCorruptDataLengthReply1, dnsTXTCorruptDataLengthReply2}
for i := range replies {
data, err := hex.DecodeString(replies[i])
if err != nil {
t.Fatal(err)
}
msg := new(dnsMsg)
ok := msg.Unpack(data)
if ok {
t.Errorf("test %d: expected to fail on unpacking corrupt packet", i)
}
}
}
func TestDNSParseTXTCorruptTXTLengthReply(t *testing.T) {
replies := []string{dnsTXTCorruptTXTLengthReply1, dnsTXTCorruptTXTLengthReply2}
for i := range replies {
data, err := hex.DecodeString(replies[i])
if err != nil {
t.Fatal(err)
}
msg := new(dnsMsg)
ok := msg.Unpack(data)
// Unpacking should succeed, but we should just get the header.
if !ok {
t.Errorf("test %d: unpacking packet failed", i)
continue
}
if len(msg.answer) != 1 {
t.Errorf("test %d: len(rr.answer) = %d; want 1", i, len(msg.answer))
continue
}
rr := msg.answer[0]
if _, justHeader := rr.(*dnsRR_Header); !justHeader {
t.Errorf("test %d: rr = %T; expected *dnsRR_Header", i, rr)
}
}
}
func TestIsResponseTo(t *testing.T) {
// Sample DNS query.
query := dnsMsg{
dnsMsgHdr: dnsMsgHdr{
id: 42,
},
question: []dnsQuestion{
{
Name: "www.example.com.",
Qtype: dnsTypeA,
Qclass: dnsClassINET,
},
},
}
resp := query
resp.response = true
if !resp.IsResponseTo(&query) {
t.Error("got false, want true")
}
badResponses := []dnsMsg{
// Different ID.
{
dnsMsgHdr: dnsMsgHdr{
id: 43,
response: true,
},
question: []dnsQuestion{
{
Name: "www.example.com.",
Qtype: dnsTypeA,
Qclass: dnsClassINET,
},
},
},
// Different query name.
{
dnsMsgHdr: dnsMsgHdr{
id: 42,
response: true,
},
question: []dnsQuestion{
{
Name: "www.google.com.",
Qtype: dnsTypeA,
Qclass: dnsClassINET,
},
},
},
// Different query type.
{
dnsMsgHdr: dnsMsgHdr{
id: 42,
response: true,
},
question: []dnsQuestion{
{
Name: "www.example.com.",
Qtype: dnsTypeAAAA,
Qclass: dnsClassINET,
},
},
},
// Different query class.
{
dnsMsgHdr: dnsMsgHdr{
id: 42,
response: true,
},
question: []dnsQuestion{
{
Name: "www.example.com.",
Qtype: dnsTypeA,
Qclass: dnsClassCSNET,
},
},
},
// No questions.
{
dnsMsgHdr: dnsMsgHdr{
id: 42,
response: true,
},
},
// Extra questions.
{
dnsMsgHdr: dnsMsgHdr{
id: 42,
response: true,
},
question: []dnsQuestion{
{
Name: "www.example.com.",
Qtype: dnsTypeA,
Qclass: dnsClassINET,
},
{
Name: "www.golang.org.",
Qtype: dnsTypeAAAA,
Qclass: dnsClassINET,
},
},
},
}
for i := range badResponses {
if badResponses[i].IsResponseTo(&query) {
t.Errorf("%v: got true, want false", i)
}
}
}
// 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"
// TXT reply with one <character-string>
const dnsTXTReply1 = "b3458180000100010004000505676d61696c03636f6d0000100001c00c001000010000012c00" +
"201f763d737066312072656469726563743d5f7370662e676f6f676c652e636f6dc00" +
"c0002000100025d4c000d036e733406676f6f676c65c012c00c0002000100025d4c00" +
"06036e7331c057c00c0002000100025d4c0006036e7333c057c00c0002000100025d4" +
"c0006036e7332c057c06c00010001000248b50004d8ef200ac09000010001000248b5" +
"0004d8ef220ac07e00010001000248b50004d8ef240ac05300010001000248b50004d" +
"8ef260a0000291000000000000000"
// TXT reply with more than one <character-string>.
// See https://tools.ietf.org/html/rfc1035#section-3.3.14
const dnsTXTReply2 = "a0a381800001000100020002045f7370660866616365626f6f6b03636f6d0000100001c00c0010000" +
"100000e1000af7f763d73706631206970343a36392e36332e3137392e3235206970343a36392e" +
"36332e3137382e3132382f3235206970343a36392e36332e3138342e302f3235206970343a363" +
"62e3232302e3134342e3132382f3235206970343a36362e3232302e3135352e302f3234206970" +
"343a36392e3137312e3233322e302f323520692e70343a36362e3232302e3135372e302f32352" +
"06970343a36392e3137312e3234342e302f3234206d78202d616c6cc0110002000100025d1500" +
"070161026e73c011c0110002000100025d1500040162c0ecc0ea0001000100025d15000445abe" +
"f0cc0fd0001000100025d15000445abff0c"
// DataLength field should be sum of all TXT fields. In this case it's less.
const dnsTXTCorruptDataLengthReply1 = "a0a381800001000100020002045f7370660866616365626f6f6b03636f6d0000100001c00c0010000" +
"100000e1000967f763d73706631206970343a36392e36332e3137392e3235206970343a36392e" +
"36332e3137382e3132382f3235206970343a36392e36332e3138342e302f3235206970343a363" +
"62e3232302e3134342e3132382f3235206970343a36362e3232302e3135352e302f3234206970" +
"343a36392e3137312e3233322e302f323520692e70343a36362e3232302e3135372e302f32352" +
"06970343a36392e3137312e3234342e302f3234206d78202d616c6cc0110002000100025d1500" +
"070161026e73c011c0110002000100025d1500040162c0ecc0ea0001000100025d15000445abe" +
"f0cc0fd0001000100025d15000445abff0c"
// Same as above but DataLength is more than sum of TXT fields.
const dnsTXTCorruptDataLengthReply2 = "a0a381800001000100020002045f7370660866616365626f6f6b03636f6d0000100001c00c0010000" +
"100000e1001227f763d73706631206970343a36392e36332e3137392e3235206970343a36392e" +
"36332e3137382e3132382f3235206970343a36392e36332e3138342e302f3235206970343a363" +
"62e3232302e3134342e3132382f3235206970343a36362e3232302e3135352e302f3234206970" +
"343a36392e3137312e3233322e302f323520692e70343a36362e3232302e3135372e302f32352" +
"06970343a36392e3137312e3234342e302f3234206d78202d616c6cc0110002000100025d1500" +
"070161026e73c011c0110002000100025d1500040162c0ecc0ea0001000100025d15000445abe" +
"f0cc0fd0001000100025d15000445abff0c"
// TXT Length field is less than actual length.
const dnsTXTCorruptTXTLengthReply1 = "a0a381800001000100020002045f7370660866616365626f6f6b03636f6d0000100001c00c0010000" +
"100000e1000af7f763d73706631206970343a36392e36332e3137392e3235206970343a36392e" +
"36332e3137382e3132382f3235206970343a36392e36332e3138342e302f3235206970343a363" +
"62e3232302e3134342e3132382f3235206970343a36362e3232302e3135352e302f3234206970" +
"343a36392e3137312e3233322e302f323520691470343a36362e3232302e3135372e302f32352" +
"06970343a36392e3137312e3234342e302f3234206d78202d616c6cc0110002000100025d1500" +
"070161026e73c011c0110002000100025d1500040162c0ecc0ea0001000100025d15000445abe" +
"f0cc0fd0001000100025d15000445abff0c"
// TXT Length field is more than actual length.
const dnsTXTCorruptTXTLengthReply2 = "a0a381800001000100020002045f7370660866616365626f6f6b03636f6d0000100001c00c0010000" +
"100000e1000af7f763d73706631206970343a36392e36332e3137392e3235206970343a36392e" +
"36332e3137382e3132382f3235206970343a36392e36332e3138342e302f3235206970343a363" +
"62e3232302e3134342e3132382f3235206970343a36362e3232302e3135352e302f3234206970" +
"343a36392e3137312e3233322e302f323520693370343a36362e3232302e3135372e302f32352" +
"06970343a36392e3137312e3234342e302f3234206d78202d616c6cc0110002000100025d1500" +
"070161026e73c011c0110002000100025d1500040162c0ecc0ea0001000100025d15000445abe" +
"f0cc0fd0001000100025d15000445abff0c"