1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
|
#include "ares-test.h"
#include "dns-proto.h"
#include <sstream>
#include <vector>
namespace ares {
namespace test {
TEST_F(LibraryTest, ParsePtrReplyOK) {
byte addrv4[4] = {0x10, 0x20, 0x30, 0x40};
DNSPacket pkt;
pkt.set_qid(0x1234).set_response().set_aa()
.add_question(new DNSQuestion("64.48.32.16.in-addr.arpa", ns_t_ptr))
.add_answer(new DNSPtrRR("64.48.32.16.in-addr.arpa", 100, "other.com"));
std::vector<byte> data = pkt.data();
struct hostent *host = nullptr;
EXPECT_EQ(ARES_SUCCESS, ares_parse_ptr_reply(data.data(), data.size(),
addrv4, sizeof(addrv4), AF_INET, &host, NULL));
ASSERT_NE(nullptr, host);
std::stringstream ss;
ss << HostEnt(host);
EXPECT_EQ("{'other.com' aliases=[other.com] addrs=[16.32.48.64]}", ss.str());
ares_free_hostent(host);
}
TEST_F(LibraryTest, ParsePtrReplyCname) {
byte addrv4[4] = {0x10, 0x20, 0x30, 0x40};
DNSPacket pkt;
pkt.set_qid(0x1234).set_response().set_aa()
.add_question(new DNSQuestion("64.48.32.16.in-addr.arpa", ns_t_ptr))
.add_answer(new DNSCnameRR("64.48.32.16.in-addr.arpa", 50, "64.48.32.8.in-addr.arpa"))
.add_answer(new DNSPtrRR("64.48.32.8.in-addr.arpa", 100, "other.com"));
std::vector<byte> data = pkt.data();
struct hostent *host = nullptr;
EXPECT_EQ(ARES_SUCCESS, ares_parse_ptr_reply(data.data(), data.size(),
addrv4, sizeof(addrv4), AF_INET, &host, NULL));
ASSERT_NE(nullptr, host);
std::stringstream ss;
ss << HostEnt(host);
EXPECT_EQ("{'other.com' aliases=[other.com] addrs=[16.32.48.64]}", ss.str());
ares_free_hostent(host);
}
struct DNSMalformedCnameRR : public DNSCnameRR {
DNSMalformedCnameRR(const std::string& name, int ttl, const std::string& other)
: DNSCnameRR(name, ttl, other) {}
std::vector<byte> data() const {
std::vector<byte> data = DNSRR::data();
std::vector<byte> encname = EncodeString(other_);
encname[0] = encname[0] + 63; // invalid label length
int len = encname.size();
PushInt16(&data, len);
data.insert(data.end(), encname.begin(), encname.end());
return data;
}
};
TEST_F(LibraryTest, ParsePtrReplyMalformedCname) {
byte addrv4[4] = {0x10, 0x20, 0x30, 0x40};
DNSPacket pkt;
pkt.set_qid(0x1234).set_response().set_aa()
.add_question(new DNSQuestion("64.48.32.16.in-addr.arpa", ns_t_ptr))
.add_answer(new DNSMalformedCnameRR("64.48.32.16.in-addr.arpa", 50, "64.48.32.8.in-addr.arpa"))
.add_answer(new DNSPtrRR("64.48.32.8.in-addr.arpa", 100, "other.com"));
std::vector<byte> data = pkt.data();
struct hostent *host = nullptr;
EXPECT_EQ(ARES_EBADRESP, ares_parse_ptr_reply(data.data(), data.size(),
addrv4, sizeof(addrv4), AF_INET, &host, NULL));
ASSERT_EQ(nullptr, host);
}
TEST_F(LibraryTest, ParseManyPtrReply) {
byte addrv4[4] = {0x10, 0x20, 0x30, 0x40};
DNSPacket pkt;
pkt.set_qid(0x1234).set_response().set_aa()
.add_question(new DNSQuestion("64.48.32.16.in-addr.arpa", ns_t_ptr))
.add_answer(new DNSPtrRR("64.48.32.16.in-addr.arpa", 100, "main.com"))
.add_answer(new DNSPtrRR("64.48.32.16.in-addr.arpa", 100, "other1.com"))
.add_answer(new DNSPtrRR("64.48.32.16.in-addr.arpa", 100, "other2.com"))
.add_answer(new DNSPtrRR("64.48.32.16.in-addr.arpa", 100, "other3.com"))
.add_answer(new DNSPtrRR("64.48.32.16.in-addr.arpa", 100, "other4.com"))
.add_answer(new DNSPtrRR("64.48.32.16.in-addr.arpa", 100, "other5.com"))
.add_answer(new DNSPtrRR("64.48.32.16.in-addr.arpa", 100, "other6.com"))
.add_answer(new DNSPtrRR("64.48.32.16.in-addr.arpa", 100, "other7.com"))
.add_answer(new DNSPtrRR("64.48.32.16.in-addr.arpa", 100, "other8.com"))
.add_answer(new DNSPtrRR("64.48.32.16.in-addr.arpa", 100, "other9.com"));
std::vector<byte> data = pkt.data();
struct hostent *host = nullptr;
EXPECT_EQ(ARES_SUCCESS, ares_parse_ptr_reply(data.data(), data.size(),
addrv4, sizeof(addrv4), AF_INET, &host, NULL));
ASSERT_NE(nullptr, host);
ares_free_hostent(host);
}
TEST_F(LibraryTest, ParsePtrReplyAdditional) {
byte addrv4[4] = {0x10, 0x20, 0x30, 0x40};
DNSPacket pkt;
pkt.set_qid(0x1234).set_response().set_aa()
.add_question(new DNSQuestion("64.48.32.16.in-addr.arpa", ns_t_ptr))
.add_answer(new DNSPtrRR("64.48.32.16.in-addr.arpa", 55, "other.com"))
.add_auth(new DNSNsRR("16.in-addr.arpa", 234, "ns1.other.com"))
.add_auth(new DNSNsRR("16.in-addr.arpa", 234, "bb.ns2.other.com"))
.add_auth(new DNSNsRR("16.in-addr.arpa", 234, "ns3.other.com"))
.add_additional(new DNSARR("ns1.other.com", 229, {10,20,30,41}))
.add_additional(new DNSARR("bb.ns2.other.com", 229, {10,20,30,42}))
.add_additional(new DNSARR("ns3.other.com", 229, {10,20,30,43}));
std::vector<byte> data = pkt.data();
struct hostent *host = nullptr;
EXPECT_EQ(ARES_SUCCESS, ares_parse_ptr_reply(data.data(), data.size(),
addrv4, sizeof(addrv4), AF_INET, &host, NULL));
ASSERT_NE(nullptr, host);
std::stringstream ss;
ss << HostEnt(host);
EXPECT_EQ("{'other.com' aliases=[other.com] addrs=[16.32.48.64]}", ss.str());
ares_free_hostent(host);
}
TEST_F(LibraryTest, ParsePtrReplyErrors) {
byte addrv4[4] = {0x10, 0x20, 0x30, 0x40};
DNSPacket pkt;
pkt.set_qid(0x1234).set_response().set_aa()
.add_question(new DNSQuestion("64.48.32.16.in-addr.arpa", ns_t_ptr))
.add_answer(new DNSPtrRR("64.48.32.16.in-addr.arpa", 100, "other.com"));
std::vector<byte> data;
struct hostent *host = nullptr;
// No question.
pkt.questions_.clear();
data = pkt.data();
EXPECT_EQ(ARES_EBADRESP, ares_parse_ptr_reply(data.data(), data.size(),
addrv4, sizeof(addrv4), AF_INET, &host, NULL));
pkt.add_question(new DNSQuestion("64.48.32.16.in-addr.arpa", ns_t_ptr));
// Question != answer
pkt.questions_.clear();
pkt.add_question(new DNSQuestion("99.48.32.16.in-addr.arpa", ns_t_ptr));
data = pkt.data();
EXPECT_EQ(ARES_ENODATA, ares_parse_ptr_reply(data.data(), data.size(),
addrv4, sizeof(addrv4), AF_INET, &host, NULL));
EXPECT_EQ(nullptr, host);
pkt.questions_.clear();
pkt.add_question(new DNSQuestion("64.48.32.16.in-addr.arpa", ns_t_ptr));
// Two questions.
pkt.add_question(new DNSQuestion("64.48.32.16.in-addr.arpa", ns_t_ptr));
data = pkt.data();
EXPECT_EQ(ARES_EBADRESP, ares_parse_ptr_reply(data.data(), data.size(),
addrv4, sizeof(addrv4), AF_INET, &host, NULL));
EXPECT_EQ(nullptr, host);
pkt.questions_.clear();
pkt.add_question(new DNSQuestion("64.48.32.16.in-addr.arpa", ns_t_ptr));
// Wrong sort of answer.
pkt.answers_.clear();
pkt.add_answer(new DNSMxRR("example.com", 100, 100, "mx1.example.com"));
data = pkt.data();
EXPECT_EQ(ARES_ENODATA, ares_parse_ptr_reply(data.data(), data.size(),
addrv4, sizeof(addrv4), AF_INET, &host, NULL));
EXPECT_EQ(nullptr, host);
pkt.answers_.clear();
pkt.add_answer(new DNSPtrRR("64.48.32.16.in-addr.arpa", 100, "other.com"));
// No answer.
pkt.answers_.clear();
data = pkt.data();
EXPECT_EQ(ARES_ENODATA, ares_parse_ptr_reply(data.data(), data.size(),
addrv4, sizeof(addrv4), AF_INET, &host, NULL));
EXPECT_EQ(nullptr, host);
pkt.add_answer(new DNSPtrRR("64.48.32.16.in-addr.arpa", 100, "other.com"));
// Truncated packets.
data = pkt.data();
for (size_t len = 1; len < data.size(); len++) {
EXPECT_EQ(ARES_EBADRESP, ares_parse_ptr_reply(data.data(), len,
addrv4, sizeof(addrv4), AF_INET, &host, NULL));
EXPECT_EQ(nullptr, host);
}
// Truncated packets with CNAME.
pkt.add_answer(new DNSCnameRR("64.48.32.16.in-addr.arpa", 50, "64.48.32.8.in-addr.arpa"));
data = pkt.data();
for (size_t len = 1; len < data.size(); len++) {
EXPECT_EQ(ARES_EBADRESP, ares_parse_ptr_reply(data.data(), len,
addrv4, sizeof(addrv4), AF_INET, &host, NULL));
EXPECT_EQ(nullptr, host);
}
}
TEST_F(LibraryTest, ParsePtrReplyAllocFailSome) {
byte addrv4[4] = {0x10, 0x20, 0x30, 0x40};
DNSPacket pkt;
pkt.set_qid(0x1234).set_response().set_aa()
.add_question(new DNSQuestion("64.48.32.16.in-addr.arpa", ns_t_ptr))
.add_answer(new DNSPtrRR("64.48.32.16.in-addr.arpa", 100, "main.com"))
.add_answer(new DNSPtrRR("64.48.32.16.in-addr.arpa", 100, "other1.com"))
.add_answer(new DNSPtrRR("64.48.32.16.in-addr.arpa", 100, "other2.com"))
.add_answer(new DNSPtrRR("64.48.32.16.in-addr.arpa", 100, "other3.com"));
std::vector<byte> data = pkt.data();
struct hostent *host = nullptr;
for (int ii = 1; ii <= 18; ii++) {
ClearFails();
SetAllocFail(ii);
EXPECT_EQ(ARES_ENOMEM, ares_parse_ptr_reply(data.data(), data.size(),
addrv4, sizeof(addrv4), AF_INET, &host, NULL)) << ii;
}
}
TEST_F(LibraryTest, ParsePtrReplyAllocFailMany) {
byte addrv4[4] = {0x10, 0x20, 0x30, 0x40};
DNSPacket pkt;
pkt.set_qid(0x1234).set_response().set_aa()
.add_question(new DNSQuestion("64.48.32.16.in-addr.arpa", ns_t_ptr))
.add_answer(new DNSPtrRR("64.48.32.16.in-addr.arpa", 100, "main.com"))
.add_answer(new DNSPtrRR("64.48.32.16.in-addr.arpa", 100, "other1.com"))
.add_answer(new DNSPtrRR("64.48.32.16.in-addr.arpa", 100, "other2.com"))
.add_answer(new DNSPtrRR("64.48.32.16.in-addr.arpa", 100, "other3.com"))
.add_answer(new DNSPtrRR("64.48.32.16.in-addr.arpa", 100, "other4.com"))
.add_answer(new DNSPtrRR("64.48.32.16.in-addr.arpa", 100, "other5.com"))
.add_answer(new DNSPtrRR("64.48.32.16.in-addr.arpa", 100, "other6.com"))
.add_answer(new DNSPtrRR("64.48.32.16.in-addr.arpa", 100, "other7.com"))
.add_answer(new DNSPtrRR("64.48.32.16.in-addr.arpa", 100, "other8.com"))
.add_answer(new DNSPtrRR("64.48.32.16.in-addr.arpa", 100, "other9.com"));
std::vector<byte> data = pkt.data();
struct hostent *host = nullptr;
for (int ii = 1; ii <= 63; ii++) {
ClearFails();
SetAllocFail(ii);
int rc = ares_parse_ptr_reply(data.data(), data.size(),
addrv4, sizeof(addrv4), AF_INET, &host, NULL);
if (rc != ARES_ENOMEM) {
EXPECT_EQ(ARES_SUCCESS, rc);
ares_free_hostent(host);
host = nullptr;
}
}
}
} // namespace test
} // namespace ares
|
