lh | 9ed821d | 2023-04-07 01:36:19 -0700 | [diff] [blame] | 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 | |
| 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 | |
| 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 | |
| 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 | |
| 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 | |
| 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 | |
| 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 | |
| 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 | |
| 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 | |
| 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 | |
| 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 |