ares-test-parse-mx.cc (5836B)
1 /* MIT License 2 * 3 * Copyright (c) The c-ares project and its contributors 4 * 5 * Permission is hereby granted, free of charge, to any person obtaining a copy 6 * of this software and associated documentation files (the "Software"), to deal 7 * in the Software without restriction, including without limitation the rights 8 * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell 9 * copies of the Software, and to permit persons to whom the Software is 10 * furnished to do so, subject to the following conditions: 11 * 12 * The above copyright notice and this permission notice (including the next 13 * paragraph) shall be included in all copies or substantial portions of the 14 * Software. 15 * 16 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR 17 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, 18 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE 19 * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER 20 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, 21 * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE 22 * SOFTWARE. 23 * 24 * SPDX-License-Identifier: MIT 25 */ 26 #include "ares-test.h" 27 #include "dns-proto.h" 28 29 #include <sstream> 30 #include <vector> 31 32 namespace ares { 33 namespace test { 34 35 TEST_F(LibraryTest, ParseMxReplyOK) { 36 DNSPacket pkt; 37 pkt.set_qid(0x1234).set_response().set_aa() 38 .add_question(new DNSQuestion("example.com", T_MX)) 39 .add_answer(new DNSMxRR("example.com", 100, 100, "mx1.example.com")) 40 .add_answer(new DNSMxRR("example.com", 100, 200, "mx2.example.com")); 41 std::vector<byte> data = pkt.data(); 42 43 struct ares_mx_reply* mx = nullptr; 44 EXPECT_EQ(ARES_SUCCESS, ares_parse_mx_reply(data.data(), (int)data.size(), &mx)); 45 ASSERT_NE(nullptr, mx); 46 EXPECT_EQ("mx1.example.com", std::string(mx->host)); 47 EXPECT_EQ(100, mx->priority); 48 49 struct ares_mx_reply* mx2 = mx->next; 50 ASSERT_NE(nullptr, mx2); 51 EXPECT_EQ("mx2.example.com", std::string(mx2->host)); 52 EXPECT_EQ(200, mx2->priority); 53 EXPECT_EQ(nullptr, mx2->next); 54 55 ares_free_data(mx); 56 } 57 58 TEST_F(LibraryTest, ParseMxReplyMalformed) { 59 std::vector<byte> data = { 60 0x12, 0x34, // qid 61 0x84, // response + query + AA + not-TC + not-RD 62 0x00, // not-RA + not-Z + not-AD + not-CD + rc=NoError 63 0x00, 0x01, // num questions 64 0x00, 0x01, // num answer RRs 65 0x00, 0x00, // num authority RRs 66 0x00, 0x00, // num additional RRs 67 // Question 68 0x07, 'e', 'x', 'a', 'm', 'p', 'l', 'e', 69 0x03, 'c', 'o', 'm', 70 0x00, 71 0x00, 0x0F, // type MX 72 0x00, 0x01, // class IN 73 // Answer 1 74 0x07, 'e', 'x', 'a', 'm', 'p', 'l', 'e', 75 0x03, 'c', 'o', 'm', 76 0x00, 77 0x00, 0x0F, // RR type 78 0x00, 0x01, // class IN 79 0x01, 0x02, 0x03, 0x04, // TTL 80 0x00, 0x01, // rdata length -- too short 81 0x02, 82 }; 83 84 struct ares_mx_reply* mx = nullptr; 85 EXPECT_EQ(ARES_EBADRESP, ares_parse_mx_reply(data.data(), (int)data.size(), &mx)); 86 ASSERT_EQ(nullptr, mx); 87 } 88 89 90 TEST_F(LibraryTest, ParseMxReplyErrors) { 91 DNSPacket pkt; 92 pkt.set_qid(0x1234).set_response().set_aa() 93 .add_question(new DNSQuestion("example.com", T_MX)) 94 .add_answer(new DNSMxRR("example.com", 100, 100, "mx1.example.com")); 95 std::vector<byte> data; 96 struct ares_mx_reply* mx = nullptr; 97 98 // No question. 99 pkt.questions_.clear(); 100 data = pkt.data(); 101 EXPECT_EQ(ARES_EBADRESP, ares_parse_mx_reply(data.data(), (int)data.size(), &mx)); 102 EXPECT_EQ(nullptr, mx); 103 pkt.add_question(new DNSQuestion("example.com", T_MX)); 104 105 #ifdef DISABLED 106 // Question != answer 107 pkt.questions_.clear(); 108 pkt.add_question(new DNSQuestion("Axample.com", T_MX)); 109 data = pkt.data(); 110 EXPECT_EQ(ARES_EBADRESP, ares_parse_mx_reply(data.data(), (int)data.size(), &mx)); 111 pkt.questions_.clear(); 112 pkt.add_question(new DNSQuestion("example.com", T_MX)); 113 #endif 114 115 // Two questions. 116 pkt.add_question(new DNSQuestion("example.com", T_MX)); 117 data = pkt.data(); 118 EXPECT_EQ(ARES_EBADRESP, ares_parse_mx_reply(data.data(), (int)data.size(), &mx)); 119 EXPECT_EQ(nullptr, mx); 120 pkt.questions_.clear(); 121 pkt.add_question(new DNSQuestion("example.com", T_MX)); 122 123 // Wrong sort of answer. 124 // TODO(drysdale): check if this should be ARES_ENODATA? 125 pkt.answers_.clear(); 126 pkt.add_answer(new DNSSrvRR("example.abc.def.com", 180, 0, 10, 8160, "example.abc.def.com")); 127 data = pkt.data(); 128 EXPECT_EQ(ARES_SUCCESS, ares_parse_mx_reply(data.data(), (int)data.size(), &mx)); 129 EXPECT_EQ(nullptr, mx); 130 pkt.answers_.clear(); 131 pkt.add_answer(new DNSMxRR("example.com", 100, 100, "mx1.example.com")); 132 133 // No answer. 134 pkt.answers_.clear(); 135 data = pkt.data(); 136 EXPECT_EQ(ARES_ENODATA, ares_parse_mx_reply(data.data(), (int)data.size(), &mx)); 137 EXPECT_EQ(nullptr, mx); 138 pkt.add_answer(new DNSMxRR("example.com", 100, 100, "mx1.example.com")); 139 140 // Truncated packets. 141 data = pkt.data(); 142 for (size_t len = 1; len < data.size(); len++) { 143 int rc = ares_parse_mx_reply(data.data(), (int)len, &mx); 144 EXPECT_EQ(nullptr, mx); 145 EXPECT_TRUE(rc == ARES_EBADRESP || rc == ARES_EBADNAME); 146 } 147 148 // Negative Length 149 EXPECT_EQ(ARES_EBADRESP, ares_parse_mx_reply(data.data(), -1, &mx)); 150 } 151 152 TEST_F(LibraryTest, ParseMxReplyAllocFail) { 153 DNSPacket pkt; 154 pkt.set_qid(0x1234).set_response().set_aa() 155 .add_question(new DNSQuestion("example.com", T_MX)) 156 .add_answer(new DNSCnameRR("example.com", 300, "c.example.com")) 157 .add_answer(new DNSMxRR("c.example.com", 100, 100, "mx1.example.com")); 158 std::vector<byte> data = pkt.data(); 159 struct ares_mx_reply* mx = nullptr; 160 161 for (int ii = 1; ii <= 5; ii++) { 162 ClearFails(); 163 SetAllocFail(ii); 164 EXPECT_EQ(ARES_ENOMEM, ares_parse_mx_reply(data.data(), (int)data.size(), &mx)) << ii; 165 } 166 } 167 168 } // namespace test 169 } // namespace ares