1 #include "ares-test.h"
2 #include "dns-proto.h"
3
4 #include <sstream>
5 #include <vector>
6
7 namespace ares {
8 namespace test {
9
TEST_F(LibraryTest,ParseAReplyOK)10 TEST_F(LibraryTest, ParseAReplyOK) {
11 DNSPacket pkt;
12 pkt.set_qid(0x1234).set_response().set_aa()
13 .add_question(new DNSQuestion("example.com", ns_t_a))
14 .add_answer(new DNSARR("example.com", 0x01020304, {2,3,4,5}));
15 std::vector<byte> data = {
16 0x12, 0x34, // qid
17 0x84, // response + query + AA + not-TC + not-RD
18 0x00, // not-RA + not-Z + not-AD + not-CD + rc=NoError
19 0x00, 0x01, // num questions
20 0x00, 0x01, // num answer RRs
21 0x00, 0x00, // num authority RRs
22 0x00, 0x00, // num additional RRs
23 // Question
24 0x07, 'e', 'x', 'a', 'm', 'p', 'l', 'e',
25 0x03, 'c', 'o', 'm',
26 0x00,
27 0x00, 0x01, // type A
28 0x00, 0x01, // class IN
29 // Answer 1
30 0x07, 'e', 'x', 'a', 'm', 'p', 'l', 'e',
31 0x03, 'c', 'o', 'm',
32 0x00,
33 0x00, 0x01, // RR type
34 0x00, 0x01, // class IN
35 0x01, 0x02, 0x03, 0x04, // TTL
36 0x00, 0x04, // rdata length
37 0x02, 0x03, 0x04, 0x05,
38 };
39 EXPECT_EQ(data, pkt.data());
40 struct hostent *host = nullptr;
41 struct ares_addrttl info[5];
42 int count = 5;
43 EXPECT_EQ(ARES_SUCCESS, ares_parse_a_reply(data.data(), data.size(),
44 &host, info, &count));
45 EXPECT_EQ(1, count);
46 EXPECT_EQ(0x01020304, info[0].ttl);
47 unsigned long expected_addr = htonl(0x02030405);
48 EXPECT_EQ(expected_addr, info[0].ipaddr.s_addr);
49 EXPECT_EQ("2.3.4.5", AddressToString(&(info[0].ipaddr), 4));
50 ASSERT_NE(nullptr, host);
51 std::stringstream ss;
52 ss << HostEnt(host);
53 EXPECT_EQ("{'example.com' aliases=[] addrs=[2.3.4.5]}", ss.str());
54 ares_free_hostent(host);
55
56 // Repeat without providing a hostent
57 EXPECT_EQ(ARES_SUCCESS, ares_parse_a_reply(data.data(), data.size(),
58 nullptr, info, &count));
59 EXPECT_EQ(1, count);
60 EXPECT_EQ(0x01020304, info[0].ttl);
61 EXPECT_EQ(expected_addr, info[0].ipaddr.s_addr);
62 EXPECT_EQ("2.3.4.5", AddressToString(&(info[0].ipaddr), 4));
63 }
64
TEST_F(LibraryTest,ParseMalformedAReply)65 TEST_F(LibraryTest, ParseMalformedAReply) {
66 std::vector<byte> data = {
67 0x12, 0x34, // [0:2) qid
68 0x84, // [2] response + query + AA + not-TC + not-RD
69 0x00, // [3] not-RA + not-Z + not-AD + not-CD + rc=NoError
70 0x00, 0x01, // [4:6) num questions
71 0x00, 0x01, // [6:8) num answer RRs
72 0x00, 0x00, // [8:10) num authority RRs
73 0x00, 0x00, // [10:12) num additional RRs
74 // Question
75 0x07, 'e', 'x', 'a', 'm', 'p', 'l', 'e', // [12:20)
76 0x03, 'c', 'o', 'm', // [20,24)
77 0x00, // [24]
78 0x00, 0x01, // [25:26) type A
79 0x00, 0x01, // [27:29) class IN
80 // Answer 1
81 0x07, 'e', 'x', 'a', 'm', 'p', 'l', 'e', // [29:37)
82 0x03, 'c', 'o', 'm', // [37:41)
83 0x00, // [41]
84 0x00, 0x01, // [42:44) RR type
85 0x00, 0x01, // [44:46) class IN
86 0x01, 0x02, 0x03, 0x04, // [46:50) TTL
87 0x00, 0x04, // [50:52) rdata length
88 0x02, 0x03, 0x04, 0x05, // [52,56)
89 };
90 struct hostent *host = nullptr;
91 struct ares_addrttl info[2];
92 int count = 2;
93
94 // Invalid RR-len.
95 std::vector<byte> invalid_rrlen(data);
96 invalid_rrlen[51] = 180;
97 EXPECT_EQ(ARES_EBADRESP, ares_parse_a_reply(invalid_rrlen.data(), invalid_rrlen.size(),
98 &host, info, &count));
99
100 // Truncate mid-question.
101 EXPECT_EQ(ARES_EBADRESP, ares_parse_a_reply(data.data(), 26,
102 &host, info, &count));
103
104 // Truncate mid-answer.
105 EXPECT_EQ(ARES_EBADRESP, ares_parse_a_reply(data.data(), 42,
106 &host, info, &count));
107 }
108
TEST_F(LibraryTest,ParseAReplyNoData)109 TEST_F(LibraryTest, ParseAReplyNoData) {
110 DNSPacket pkt;
111 pkt.set_qid(0x1234).set_response().set_aa()
112 .add_question(new DNSQuestion("example.com", ns_t_a));
113 std::vector<byte> data = pkt.data();
114 struct hostent *host = nullptr;
115 struct ares_addrttl info[2];
116 int count = 2;
117 EXPECT_EQ(ARES_ENODATA, ares_parse_a_reply(data.data(), data.size(),
118 &host, info, &count));
119 EXPECT_EQ(0, count);
120 EXPECT_EQ(nullptr, host);
121
122 // Again but with a CNAME.
123 pkt.add_answer(new DNSCnameRR("example.com", 200, "c.example.com"));
124 EXPECT_EQ(ARES_ENODATA, ares_parse_a_reply(data.data(), data.size(),
125 &host, info, &count));
126 EXPECT_EQ(0, count);
127 EXPECT_EQ(nullptr, host);
128 }
129
TEST_F(LibraryTest,ParseAReplyVariantA)130 TEST_F(LibraryTest, ParseAReplyVariantA) {
131 DNSPacket pkt;
132 pkt.set_qid(6366).set_rd().set_ra()
133 .add_question(new DNSQuestion("mit.edu", ns_t_a))
134 .add_answer(new DNSARR("mit.edu", 52, {18,7,22,69}))
135 .add_auth(new DNSNsRR("mit.edu", 292, "W20NS.mit.edu"))
136 .add_auth(new DNSNsRR("mit.edu", 292, "BITSY.mit.edu"))
137 .add_auth(new DNSNsRR("mit.edu", 292, "STRAWB.mit.edu"))
138 .add_additional(new DNSARR("STRAWB.mit.edu", 292, {18,71,0,151}));
139 struct hostent *host = nullptr;
140 struct ares_addrttl info[2];
141 int count = 2;
142 std::vector<byte> data = pkt.data();
143 EXPECT_EQ(ARES_SUCCESS, ares_parse_a_reply(data.data(), data.size(),
144 &host, info, &count));
145 EXPECT_EQ(1, count);
146 EXPECT_EQ("18.7.22.69", AddressToString(&(info[0].ipaddr), 4));
147 EXPECT_EQ(52, info[0].ttl);
148 ares_free_hostent(host);
149 }
150
TEST_F(LibraryTest,ParseAReplyJustCname)151 TEST_F(LibraryTest, ParseAReplyJustCname) {
152 DNSPacket pkt;
153 pkt.set_qid(6366).set_rd().set_ra()
154 .add_question(new DNSQuestion("mit.edu", ns_t_a))
155 .add_answer(new DNSCnameRR("mit.edu", 52, "other.mit.edu"));
156 struct hostent *host = nullptr;
157 struct ares_addrttl info[2];
158 int count = 2;
159 std::vector<byte> data = pkt.data();
160 EXPECT_EQ(ARES_SUCCESS, ares_parse_a_reply(data.data(), data.size(),
161 &host, info, &count));
162 EXPECT_EQ(0, count);
163 ASSERT_NE(nullptr, host);
164 std::stringstream ss;
165 ss << HostEnt(host);
166 EXPECT_EQ("{'other.mit.edu' aliases=[mit.edu] addrs=[]}", ss.str());
167 ares_free_hostent(host);
168 }
169
TEST_F(LibraryTest,ParseAReplyVariantCname)170 TEST_F(LibraryTest, ParseAReplyVariantCname) {
171 DNSPacket pkt;
172 pkt.set_qid(6366).set_rd().set_ra()
173 .add_question(new DNSQuestion("query.example.com", ns_t_a))
174 .add_answer(new DNSCnameRR("query.example.com", 200, "redirect.query.example.com"))
175 .add_answer(new DNSARR("redirect.query.example.com", 300, {129,97,123,22}))
176 .add_auth(new DNSNsRR("example.com", 218, "aa.ns1.example.com"))
177 .add_auth(new DNSNsRR("example.com", 218, "ns2.example.com"))
178 .add_auth(new DNSNsRR("example.com", 218, "ns3.example.com"))
179 .add_auth(new DNSNsRR("example.com", 218, "ns4.example.com"))
180 .add_additional(new DNSARR("aa.ns1.example.com", 218, {129,97,1,1}))
181 .add_additional(new DNSARR("ns2.example.com", 218, {129,97,1,2}))
182 .add_additional(new DNSARR("ns3.example.com", 218, {129,97,1,3}))
183 .add_additional(new DNSARR("ns4.example.com", 218, {129,97,1,4}));
184 struct hostent *host = nullptr;
185 struct ares_addrttl info[2];
186 int count = 2;
187 std::vector<byte> data = pkt.data();
188 EXPECT_EQ(ARES_SUCCESS, ares_parse_a_reply(data.data(), data.size(),
189 &host, info, &count));
190 EXPECT_EQ(1, count);
191 EXPECT_EQ("129.97.123.22", AddressToString(&(info[0].ipaddr), 4));
192 // TTL is reduced to match CNAME's.
193 EXPECT_EQ(200, info[0].ttl);
194 ares_free_hostent(host);
195
196 // Repeat parsing without places to put the results.
197 count = 0;
198 EXPECT_EQ(ARES_SUCCESS, ares_parse_a_reply(data.data(), data.size(),
199 nullptr, info, &count));
200 }
201
TEST_F(LibraryTest,ParseAReplyVariantCnameChain)202 TEST_F(LibraryTest, ParseAReplyVariantCnameChain) {
203 DNSPacket pkt;
204 pkt.set_qid(6366).set_rd().set_ra()
205 .add_question(new DNSQuestion("c1.localhost", ns_t_a))
206 .add_answer(new DNSCnameRR("c1.localhost", 604800, "c2.localhost"))
207 .add_answer(new DNSCnameRR("c2.localhost", 604800, "c3.localhost"))
208 .add_answer(new DNSCnameRR("c3.localhost", 604800, "c4.localhost"))
209 .add_answer(new DNSARR("c4.localhost", 604800, {8,8,8,8}))
210 .add_auth(new DNSNsRR("localhost", 604800, "localhost"))
211 .add_additional(new DNSARR("localhost", 604800, {127,0,0,1}))
212 .add_additional(new DNSAaaaRR("localhost", 604800,
213 {0x7F, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
214 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x01}));
215 struct hostent *host = nullptr;
216 struct ares_addrttl info[2];
217 int count = 2;
218 std::vector<byte> data = pkt.data();
219 EXPECT_EQ(ARES_SUCCESS, ares_parse_a_reply(data.data(), data.size(),
220 &host, info, &count));
221 EXPECT_EQ(1, count);
222 EXPECT_EQ("8.8.8.8", AddressToString(&(info[0].ipaddr), 4));
223 EXPECT_EQ(604800, info[0].ttl);
224 ares_free_hostent(host);
225 }
226
TEST_F(LibraryTest,DISABLED_ParseAReplyVariantCnameLast)227 TEST_F(LibraryTest, DISABLED_ParseAReplyVariantCnameLast) {
228 DNSPacket pkt;
229 pkt.set_qid(6366).set_rd().set_ra()
230 .add_question(new DNSQuestion("query.example.com", ns_t_a))
231 .add_answer(new DNSARR("redirect.query.example.com", 300, {129,97,123,221}))
232 .add_answer(new DNSARR("redirect.query.example.com", 300, {129,97,123,222}))
233 .add_answer(new DNSARR("redirect.query.example.com", 300, {129,97,123,223}))
234 .add_answer(new DNSARR("redirect.query.example.com", 300, {129,97,123,224}))
235 .add_answer(new DNSCnameRR("query.example.com", 60, "redirect.query.example.com"))
236 .add_additional(new DNSTxtRR("query.example.com", 60, {"text record"}));
237 struct hostent *host = nullptr;
238 struct ares_addrttl info[8];
239 int count = 8;
240 std::vector<byte> data = pkt.data();
241 EXPECT_EQ(ARES_SUCCESS, ares_parse_a_reply(data.data(), data.size(),
242 &host, info, &count));
243 EXPECT_EQ(4, count);
244 EXPECT_EQ("129.97.123.221", AddressToString(&(info[0].ipaddr), 4));
245 EXPECT_EQ("129.97.123.222", AddressToString(&(info[1].ipaddr), 4));
246 EXPECT_EQ("129.97.123.223", AddressToString(&(info[2].ipaddr), 4));
247 EXPECT_EQ("129.97.123.224", AddressToString(&(info[3].ipaddr), 4));
248 EXPECT_EQ(300, info[0].ttl);
249 EXPECT_EQ(300, info[1].ttl);
250 EXPECT_EQ(300, info[2].ttl);
251 EXPECT_EQ(300, info[3].ttl);
252 ares_free_hostent(host);
253 }
254
TEST_F(LibraryTest,ParseAReplyErrors)255 TEST_F(LibraryTest, ParseAReplyErrors) {
256 DNSPacket pkt;
257 pkt.set_qid(0x1234).set_response().set_aa()
258 .add_question(new DNSQuestion("example.com", ns_t_a))
259 .add_answer(new DNSARR("example.com", 100, {0x02, 0x03, 0x04, 0x05}));
260 std::vector<byte> data;
261
262 struct hostent *host = nullptr;
263 struct ares_addrttl info[2];
264 int count = 2;
265
266 // No question.
267 pkt.questions_.clear();
268 data = pkt.data();
269 EXPECT_EQ(ARES_EBADRESP, ares_parse_a_reply(data.data(), data.size(),
270 &host, info, &count));
271 EXPECT_EQ(nullptr, host);
272 pkt.add_question(new DNSQuestion("example.com", ns_t_a));
273
274 // Question != answer
275 pkt.questions_.clear();
276 pkt.add_question(new DNSQuestion("Axample.com", ns_t_a));
277 data = pkt.data();
278 EXPECT_EQ(ARES_ENODATA, ares_parse_a_reply(data.data(), data.size(),
279 &host, info, &count));
280 EXPECT_EQ(nullptr, host);
281 pkt.questions_.clear();
282 pkt.add_question(new DNSQuestion("example.com", ns_t_a));
283
284 #ifdef DISABLED
285 // Not a response.
286 pkt.set_response(false);
287 data = pkt.data();
288 EXPECT_EQ(ARES_EBADRESP, ares_parse_a_reply(data.data(), data.size(),
289 &host, info, &count));
290 EXPECT_EQ(nullptr, host);
291 pkt.set_response(true);
292
293 // Bad return code.
294 pkt.set_rcode(ns_r_formerr);
295 data = pkt.data();
296 EXPECT_EQ(ARES_ENODATA, ares_parse_a_reply(data.data(), data.size(),
297 &host, info, &count));
298 EXPECT_EQ(nullptr, host);
299 pkt.set_rcode(ns_r_noerror);
300 #endif
301
302 // Two questions
303 pkt.add_question(new DNSQuestion("example.com", ns_t_a));
304 data = pkt.data();
305 EXPECT_EQ(ARES_EBADRESP, ares_parse_a_reply(data.data(), data.size(),
306 &host, info, &count));
307 EXPECT_EQ(nullptr, host);
308 pkt.questions_.clear();
309 pkt.add_question(new DNSQuestion("example.com", ns_t_a));
310
311 // Wrong sort of answer.
312 pkt.answers_.clear();
313 pkt.add_answer(new DNSMxRR("example.com", 100, 100, "mx1.example.com"));
314 data = pkt.data();
315 EXPECT_EQ(ARES_ENODATA, ares_parse_a_reply(data.data(), data.size(),
316 &host, info, &count));
317 EXPECT_EQ(nullptr, host);
318 pkt.answers_.clear();
319 pkt.add_answer(new DNSARR("example.com", 100, {0x02, 0x03, 0x04, 0x05}));
320
321 // No answer.
322 pkt.answers_.clear();
323 data = pkt.data();
324 EXPECT_EQ(ARES_ENODATA, ares_parse_a_reply(data.data(), data.size(),
325 &host, info, &count));
326 EXPECT_EQ(nullptr, host);
327 pkt.add_answer(new DNSARR("example.com", 100, {0x02, 0x03, 0x04, 0x05}));
328
329 // Truncated packets.
330 data = pkt.data();
331 for (size_t len = 1; len < data.size(); len++) {
332 EXPECT_EQ(ARES_EBADRESP, ares_parse_a_reply(data.data(), len,
333 &host, info, &count));
334 EXPECT_EQ(nullptr, host);
335 EXPECT_EQ(ARES_EBADRESP, ares_parse_a_reply(data.data(), len,
336 nullptr, info, &count));
337 }
338 }
339
TEST_F(LibraryTest,ParseAReplyAllocFail)340 TEST_F(LibraryTest, ParseAReplyAllocFail) {
341 DNSPacket pkt;
342 pkt.set_qid(0x1234).set_response().set_aa()
343 .add_question(new DNSQuestion("example.com", ns_t_a))
344 .add_answer(new DNSCnameRR("example.com", 300, "c.example.com"))
345 .add_answer(new DNSARR("c.example.com", 500, {0x02, 0x03, 0x04, 0x05}));
346 std::vector<byte> data = pkt.data();
347
348 struct hostent *host = nullptr;
349 struct ares_addrttl info[2];
350 int count = 2;
351
352 for (int ii = 1; ii <= 8; ii++) {
353 ClearFails();
354 SetAllocFail(ii);
355 EXPECT_EQ(ARES_ENOMEM, ares_parse_a_reply(data.data(), data.size(),
356 &host, info, &count)) << ii;
357 EXPECT_EQ(nullptr, host);
358 }
359 }
360
361 } // namespace test
362 } // namespace ares
363