test/ares-test-parse-srv.cc

   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, ParseSrvReplyOK) {
  11   DNSPacket pkt;
  12   pkt.set_qid(0x1234).set_response().set_aa()
  13     .add_question(new DNSQuestion("example.com", ns_t_srv))
  14     .add_answer(new DNSSrvRR("example.com", 100, 10, 20, 30, "srv.example.com"))
  15     .add_answer(new DNSSrvRR("example.com", 100, 11, 21, 31, "srv2.example.com"));
  16   std::vector<byte> data = pkt.data();
  17
  18   struct ares_srv_reply* srv = nullptr;
  19   EXPECT_EQ(ARES_SUCCESS, ares_parse_srv_reply(data.data(), data.size(), &srv));
  20   ASSERT_NE(nullptr, srv);
  21
  22   EXPECT_EQ("srv.example.com", std::string(srv->host));
  23   EXPECT_EQ(10, srv->priority);
  24   EXPECT_EQ(20, srv->weight);
  25   EXPECT_EQ(30, srv->port);
  26
  27   struct ares_srv_reply* srv2 = srv->next;
  28   ASSERT_NE(nullptr, srv2);
  29   EXPECT_EQ("srv2.example.com", std::string(srv2->host));
  30   EXPECT_EQ(11, srv2->priority);
  31   EXPECT_EQ(21, srv2->weight);
  32   EXPECT_EQ(31, srv2->port);
  33   EXPECT_EQ(nullptr, srv2->next);
  34
  35   ares_free_data(srv);
  36 }
  37
  38 TEST_F(LibraryTest, ParseSrvReplySingle) {
  39   DNSPacket pkt;
  40   pkt.set_qid(0x1234).set_response().set_aa()
  41     .add_question(new DNSQuestion("example.abc.def.com", ns_t_srv))
  42     .add_answer(new DNSSrvRR("example.abc.def.com", 180, 0, 10, 8160, "example.abc.def.com"))
  43     .add_auth(new DNSNsRR("abc.def.com", 44, "else1.where.com"))
  44     .add_auth(new DNSNsRR("abc.def.com", 44, "else2.where.com"))
  45     .add_auth(new DNSNsRR("abc.def.com", 44, "else3.where.com"))
  46     .add_auth(new DNSNsRR("abc.def.com", 44, "else4.where.com"))
  47     .add_auth(new DNSNsRR("abc.def.com", 44, "else5.where.com"))
  48     .add_additional(new DNSARR("else2.where.com", 42, {172,19,0,1}))
  49     .add_additional(new DNSARR("else5.where.com", 42, {172,19,0,2}));
  50   std::vector<byte> data = pkt.data();
  51
  52   struct ares_srv_reply* srv = nullptr;
  53   EXPECT_EQ(ARES_SUCCESS, ares_parse_srv_reply(data.data(), data.size(), &srv));
  54   ASSERT_NE(nullptr, srv);
  55
  56   EXPECT_EQ("example.abc.def.com", std::string(srv->host));
  57   EXPECT_EQ(0, srv->priority);
  58   EXPECT_EQ(10, srv->weight);
  59   EXPECT_EQ(8160, srv->port);
  60   EXPECT_EQ(nullptr, srv->next);
  61
  62   ares_free_data(srv);
  63 }
  64
  65 TEST_F(LibraryTest, ParseSrvReplyMalformed) {
  66   std::vector<byte> data = {
  67     0x12, 0x34,  // qid
  68     0x84, // response + query + AA + not-TC + not-RD
  69     0x00, // not-RA + not-Z + not-AD + not-CD + rc=NoError
  70     0x00, 0x01,  // num questions
  71     0x00, 0x01,  // num answer RRs
  72     0x00, 0x00,  // num authority RRs
  73     0x00, 0x00,  // num additional RRs
  74     // Question
  75     0x07, 'e', 'x', 'a', 'm', 'p', 'l', 'e',
  76     0x03, 'c', 'o', 'm',
  77     0x00,
  78     0x00, 0x21,  // type SRV
  79     0x00, 0x01,  // class IN
  80     // Answer 1
  81     0x07, 'e', 'x', 'a', 'm', 'p', 'l', 'e',
  82     0x03, 'c', 'o', 'm',
  83     0x00,
  84     0x00, 0x21,  // RR type
  85     0x00, 0x01,  // class IN
  86     0x01, 0x02, 0x03, 0x04, // TTL
  87     0x00, 0x04,  // rdata length -- too short
  88     0x02, 0x03, 0x04, 0x05,
  89   };
  90
  91   struct ares_srv_reply* srv = nullptr;
  92   EXPECT_EQ(ARES_EBADRESP, ares_parse_srv_reply(data.data(), data.size(), &srv));
  93   ASSERT_EQ(nullptr, srv);
  94 }
  95
  96 TEST_F(LibraryTest, ParseSrvReplyMultiple) {
  97   DNSPacket pkt;
  98   pkt.set_qid(0x1234).set_response().set_ra().set_rd()
  99     .add_question(new DNSQuestion("srv.example.com", ns_t_srv))
 100     .add_answer(new DNSSrvRR("srv.example.com", 300, 0, 5, 6789, "a1.srv.example.com"))
 101     .add_answer(new DNSSrvRR("srv.example.com", 300, 0, 5, 4567, "a2.srv.example.com"))
 102     .add_answer(new DNSSrvRR("srv.example.com", 300, 0, 5, 5678, "a3.srv.example.com"))
 103     .add_auth(new DNSNsRR("example.com", 300, "ns1.example.com"))
 104     .add_auth(new DNSNsRR("example.com", 300, "ns2.example.com"))
 105     .add_auth(new DNSNsRR("example.com", 300, "ns3.example.com"))
 106     .add_additional(new DNSARR("a1.srv.example.com", 300, {172,19,1,1}))
 107     .add_additional(new DNSARR("a2.srv.example.com", 300, {172,19,1,2}))
 108     .add_additional(new DNSARR("a3.srv.example.com", 300, {172,19,1,3}))
 109     .add_additional(new DNSARR("n1.example.com", 300, {172,19,0,1}))
 110     .add_additional(new DNSARR("n2.example.com", 300, {172,19,0,2}))
 111     .add_additional(new DNSARR("n3.example.com", 300, {172,19,0,3}));
 112   std::vector<byte> data = pkt.data();
 113
 114   struct ares_srv_reply* srv0 = nullptr;
 115   EXPECT_EQ(ARES_SUCCESS, ares_parse_srv_reply(data.data(), data.size(), &srv0));
 116   ASSERT_NE(nullptr, srv0);
 117   struct ares_srv_reply* srv = srv0;
 118
 119   EXPECT_EQ("a1.srv.example.com", std::string(srv->host));
 120   EXPECT_EQ(0, srv->priority);
 121   EXPECT_EQ(5, srv->weight);
 122   EXPECT_EQ(6789, srv->port);
 123   EXPECT_NE(nullptr, srv->next);
 124   srv = srv->next;
 125
 126   EXPECT_EQ("a2.srv.example.com", std::string(srv->host));
 127   EXPECT_EQ(0, srv->priority);
 128   EXPECT_EQ(5, srv->weight);
 129   EXPECT_EQ(4567, srv->port);
 130   EXPECT_NE(nullptr, srv->next);
 131   srv = srv->next;
 132
 133   EXPECT_EQ("a3.srv.example.com", std::string(srv->host));
 134   EXPECT_EQ(0, srv->priority);
 135   EXPECT_EQ(5, srv->weight);
 136   EXPECT_EQ(5678, srv->port);
 137   EXPECT_EQ(nullptr, srv->next);
 138
 139   ares_free_data(srv0);
 140 }
 141
 142 TEST_F(LibraryTest, ParseSrvReplyCname) {
 143   DNSPacket pkt;
 144   pkt.set_qid(0x1234).set_response().set_aa()
 145     .add_question(new DNSQuestion("example.abc.def.com", ns_t_srv))
 146     .add_answer(new DNSCnameRR("example.abc.def.com", 300, "cname.abc.def.com"))
 147     .add_answer(new DNSSrvRR("cname.abc.def.com", 300, 0, 10, 1234, "srv.abc.def.com"))
 148     .add_auth(new DNSNsRR("abc.def.com", 44, "else1.where.com"))
 149     .add_auth(new DNSNsRR("abc.def.com", 44, "else2.where.com"))
 150     .add_auth(new DNSNsRR("abc.def.com", 44, "else3.where.com"))
 151     .add_additional(new DNSARR("example.abc.def.com", 300, {172,19,0,1}))
 152     .add_additional(new DNSARR("else1.where.com", 42, {172,19,0,1}))
 153     .add_additional(new DNSARR("else2.where.com", 42, {172,19,0,2}))
 154     .add_additional(new DNSARR("else3.where.com", 42, {172,19,0,3}));
 155   std::vector<byte> data = pkt.data();
 156
 157   struct ares_srv_reply* srv = nullptr;
 158   EXPECT_EQ(ARES_SUCCESS, ares_parse_srv_reply(data.data(), data.size(), &srv));
 159   ASSERT_NE(nullptr, srv);
 160
 161   EXPECT_EQ("srv.abc.def.com", std::string(srv->host));
 162   EXPECT_EQ(0, srv->priority);
 163   EXPECT_EQ(10, srv->weight);
 164   EXPECT_EQ(1234, srv->port);
 165   EXPECT_EQ(nullptr, srv->next);
 166
 167   ares_free_data(srv);
 168 }
 169
 170 TEST_F(LibraryTest, ParseSrvReplyCnameMultiple) {
 171   DNSPacket pkt;
 172   pkt.set_qid(0x1234).set_response().set_ra().set_rd()
 173     .add_question(new DNSQuestion("query.example.com", ns_t_srv))
 174     .add_answer(new DNSCnameRR("query.example.com", 300, "srv.example.com"))
 175     .add_answer(new DNSSrvRR("srv.example.com", 300, 0, 5, 6789, "a1.srv.example.com"))
 176     .add_answer(new DNSSrvRR("srv.example.com", 300, 0, 5, 4567, "a2.srv.example.com"))
 177     .add_answer(new DNSSrvRR("srv.example.com", 300, 0, 5, 5678, "a3.srv.example.com"))
 178     .add_auth(new DNSNsRR("example.com", 300, "ns1.example.com"))
 179     .add_auth(new DNSNsRR("example.com", 300, "ns2.example.com"))
 180     .add_auth(new DNSNsRR("example.com", 300, "ns3.example.com"))
 181     .add_additional(new DNSARR("a1.srv.example.com", 300, {172,19,1,1}))
 182     .add_additional(new DNSARR("a2.srv.example.com", 300, {172,19,1,2}))
 183     .add_additional(new DNSARR("a3.srv.example.com", 300, {172,19,1,3}))
 184     .add_additional(new DNSARR("n1.example.com", 300, {172,19,0,1}))
 185     .add_additional(new DNSARR("n2.example.com", 300, {172,19,0,2}))
 186     .add_additional(new DNSARR("n3.example.com", 300, {172,19,0,3}));
 187   std::vector<byte> data = pkt.data();
 188
 189   struct ares_srv_reply* srv0 = nullptr;
 190   EXPECT_EQ(ARES_SUCCESS, ares_parse_srv_reply(data.data(), data.size(), &srv0));
 191   ASSERT_NE(nullptr, srv0);
 192   struct ares_srv_reply* srv = srv0;
 193
 194   EXPECT_EQ("a1.srv.example.com", std::string(srv->host));
 195   EXPECT_EQ(0, srv->priority);
 196   EXPECT_EQ(5, srv->weight);
 197   EXPECT_EQ(6789, srv->port);
 198   EXPECT_NE(nullptr, srv->next);
 199   srv = srv->next;
 200
 201   EXPECT_EQ("a2.srv.example.com", std::string(srv->host));
 202   EXPECT_EQ(0, srv->priority);
 203   EXPECT_EQ(5, srv->weight);
 204   EXPECT_EQ(4567, srv->port);
 205   EXPECT_NE(nullptr, srv->next);
 206   srv = srv->next;
 207
 208   EXPECT_EQ("a3.srv.example.com", std::string(srv->host));
 209   EXPECT_EQ(0, srv->priority);
 210   EXPECT_EQ(5, srv->weight);
 211   EXPECT_EQ(5678, srv->port);
 212   EXPECT_EQ(nullptr, srv->next);
 213
 214   ares_free_data(srv0);
 215 }
 216
 217 TEST_F(LibraryTest, ParseSrvReplyErrors) {
 218   DNSPacket pkt;
 219   pkt.set_qid(0x1234).set_response().set_aa()
 220     .add_question(new DNSQuestion("example.abc.def.com", ns_t_srv))
 221     .add_answer(new DNSSrvRR("example.abc.def.com", 180, 0, 10, 8160, "example.abc.def.com"));
 222   std::vector<byte> data;
 223   struct ares_srv_reply* srv = nullptr;
 224
 225   // No question.
 226   pkt.questions_.clear();
 227   data = pkt.data();
 228   EXPECT_EQ(ARES_EBADRESP, ares_parse_srv_reply(data.data(), data.size(), &srv));
 229   pkt.add_question(new DNSQuestion("example.abc.def.com", ns_t_srv));
 230
 231 #ifdef DISABLED
 232   // Question != answer
 233   pkt.questions_.clear();
 234   pkt.add_question(new DNSQuestion("Axample.com", ns_t_srv));
 235   data = pkt.data();
 236   EXPECT_EQ(ARES_ENODATA, ares_parse_srv_reply(data.data(), data.size(), &srv));
 237   pkt.questions_.clear();
 238   pkt.add_question(new DNSQuestion("example.com", ns_t_srv));
 239 #endif
 240
 241   // Two questions.
 242   pkt.add_question(new DNSQuestion("example.abc.def.com", ns_t_srv));
 243   data = pkt.data();
 244   EXPECT_EQ(ARES_EBADRESP, ares_parse_srv_reply(data.data(), data.size(), &srv));
 245   pkt.questions_.clear();
 246   pkt.add_question(new DNSQuestion("64.48.32.16.in-addr.arpa", ns_t_ptr));
 247
 248   // Wrong sort of answer.
 249   pkt.answers_.clear();
 250   pkt.add_answer(new DNSMxRR("example.com", 100, 100, "mx1.example.com"));
 251   data = pkt.data();
 252   EXPECT_EQ(ARES_SUCCESS, ares_parse_srv_reply(data.data(), data.size(), &srv));
 253   EXPECT_EQ(nullptr, srv);
 254   pkt.answers_.clear();
 255   pkt.add_answer(new DNSSrvRR("example.abc.def.com", 180, 0, 10, 8160, "example.abc.def.com"));
 256
 257   // No answer.
 258   pkt.answers_.clear();
 259   data = pkt.data();
 260   EXPECT_EQ(ARES_ENODATA, ares_parse_srv_reply(data.data(), data.size(), &srv));
 261   pkt.add_answer(new DNSSrvRR("example.abc.def.com", 180, 0, 10, 8160, "example.abc.def.com"));
 262
 263   // Truncated packets.
 264   data = pkt.data();
 265   for (size_t len = 1; len < data.size(); len++) {
 266     int rc = ares_parse_srv_reply(data.data(), len, &srv);
 267     EXPECT_TRUE(rc == ARES_EBADRESP || rc == ARES_EBADNAME);
 268   }
 269 }
 270
 271 TEST_F(LibraryTest, ParseSrvReplyAllocFail) {
 272   DNSPacket pkt;
 273   pkt.set_qid(0x1234).set_response().set_aa()
 274     .add_question(new DNSQuestion("example.abc.def.com", ns_t_srv))
 275     .add_answer(new DNSCnameRR("example.com", 300, "c.example.com"))
 276     .add_answer(new DNSSrvRR("example.abc.def.com", 180, 0, 10, 8160, "example.abc.def.com"));
 277   std::vector<byte> data = pkt.data();
 278   struct ares_srv_reply* srv = nullptr;
 279
 280   for (int ii = 1; ii <= 5; ii++) {
 281     ClearFails();
 282     SetAllocFail(ii);
 283     EXPECT_EQ(ARES_ENOMEM, ares_parse_srv_reply(data.data(), data.size(), &srv)) << ii;
 284   }
 285 }
 286
 287 }  // namespace test
 288 }  // namespace ares