ares-test-parse.cc (6902B)
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, ParseRootName) { 36 DNSPacket pkt; 37 pkt.set_qid(0x1234).set_response().set_aa() 38 .add_question(new DNSQuestion(".", T_A)) 39 .add_answer(new DNSARR(".", 100, {0x02, 0x03, 0x04, 0x05})); 40 std::vector<byte> data = pkt.data(); 41 42 struct hostent *host = nullptr; 43 struct ares_addrttl info[2]; 44 int count = 2; 45 EXPECT_EQ(ARES_SUCCESS, ares_parse_a_reply(data.data(), (int)data.size(), 46 &host, info, &count)); 47 EXPECT_EQ(1, count); 48 std::stringstream ss; 49 ss << HostEnt(host); 50 EXPECT_EQ("{'' aliases=[] addrs=[2.3.4.5]}", ss.str()); 51 ares_free_hostent(host); 52 } 53 54 TEST_F(LibraryTest, ParseIndirectRootName) { 55 std::vector<byte> data = { 56 0x12, 0x34, // qid 57 0x84, // response + query + AA + not-TC + not-RD 58 0x00, // not-RA + not-Z + not-AD + not-CD + rc=NoError 59 0x00, 0x01, // num questions 60 0x00, 0x01, // num answer RRs 61 0x00, 0x00, // num authority RRs 62 0x00, 0x00, // num additional RRs 63 // Question 64 0xC0, 0x04, // weird: pointer to a random zero earlier in the message 65 0x00, 0x01, // type A 66 0x00, 0x01, // class IN 67 // Answer 1 68 0xC0, 0x04, 69 0x00, 0x01, // RR type 70 0x00, 0x01, // class IN 71 0x01, 0x02, 0x03, 0x04, // TTL 72 0x00, 0x04, // rdata length 73 0x02, 0x03, 0x04, 0x05, 74 }; 75 76 struct hostent *host = nullptr; 77 struct ares_addrttl info[2]; 78 int count = 2; 79 EXPECT_EQ(ARES_SUCCESS, ares_parse_a_reply(data.data(), (int)data.size(), 80 &host, info, &count)); 81 EXPECT_EQ(1, count); 82 std::stringstream ss; 83 ss << HostEnt(host); 84 EXPECT_EQ("{'' aliases=[] addrs=[2.3.4.5]}", ss.str()); 85 ares_free_hostent(host); 86 } 87 88 89 #if 0 /* We are validating hostnames now, its not clear how this would ever be valid */ 90 TEST_F(LibraryTest, ParseEscapedName) { 91 std::vector<byte> data = { 92 0x12, 0x34, // qid 93 0x84, // response + query + AA + not-TC + not-RD 94 0x00, // not-RA + not-Z + not-AD + not-CD + rc=NoError 95 0x00, 0x01, // num questions 96 0x00, 0x01, // num answer RRs 97 0x00, 0x00, // num authority RRs 98 0x00, 0x00, // num additional RRs 99 // Question 100 0x05, 'a', '\\', 'b', '.', 'c', 101 0x03, 'c', 'o', 'm', 102 0x00, 103 0x00, 0x01, // type A 104 0x00, 0x01, // class IN 105 // Answer 1 106 0x05, 'a', '\\', 'b', '.', 'c', 107 0x03, 'c', 'o', 'm', 108 0x00, 109 0x00, 0x01, // RR type 110 0x00, 0x01, // class IN 111 0x01, 0x02, 0x03, 0x04, // TTL 112 0x00, 0x04, // rdata length 113 0x02, 0x03, 0x04, 0x05, 114 }; 115 struct hostent *host = nullptr; 116 struct ares_addrttl info[2]; 117 int count = 2; 118 EXPECT_EQ(ARES_SUCCESS, ares_parse_a_reply(data.data(), data.size(), 119 &host, info, &count)); 120 EXPECT_EQ(1, count); 121 HostEnt hent(host); 122 std::stringstream ss; 123 ss << hent; 124 // The printable name is expanded with escapes. 125 EXPECT_EQ(11, hent.name_.size()); 126 EXPECT_EQ('a', hent.name_[0]); 127 EXPECT_EQ('\\', hent.name_[1]); 128 EXPECT_EQ('\\', hent.name_[2]); 129 EXPECT_EQ('b', hent.name_[3]); 130 EXPECT_EQ('\\', hent.name_[4]); 131 EXPECT_EQ('.', hent.name_[5]); 132 EXPECT_EQ('c', hent.name_[6]); 133 ares_free_hostent(host); 134 } 135 #endif 136 137 TEST_F(LibraryTest, ParsePartialCompressedName) { 138 std::vector<byte> data = { 139 0x12, 0x34, // qid 140 0x84, // response + query + AA + not-TC + not-RD 141 0x00, // not-RA + not-Z + not-AD + not-CD + rc=NoError 142 0x00, 0x01, // num questions 143 0x00, 0x01, // num answer RRs 144 0x00, 0x00, // num authority RRs 145 0x00, 0x00, // num additional RRs 146 // Question 147 0x03, 'w', 'w', 'w', 148 0x07, 'e', 'x', 'a', 'm', 'p', 'l', 'e', 149 0x03, 'c', 'o', 'm', 150 0x00, 151 0x00, 0x01, // type A 152 0x00, 0x01, // class IN 153 // Answer 1 154 0x03, 'w', 'w', 'w', 155 0xc0, 0x10, // offset 16 156 0x00, 0x01, // RR type 157 0x00, 0x01, // class IN 158 0x01, 0x02, 0x03, 0x04, // TTL 159 0x00, 0x04, // rdata length 160 0x02, 0x03, 0x04, 0x05, 161 }; 162 struct hostent *host = nullptr; 163 struct ares_addrttl info[2]; 164 int count = 2; 165 EXPECT_EQ(ARES_SUCCESS, ares_parse_a_reply(data.data(), (int)data.size(), 166 &host, info, &count)); 167 ASSERT_NE(nullptr, host); 168 std::stringstream ss; 169 ss << HostEnt(host); 170 EXPECT_EQ("{'www.example.com' aliases=[] addrs=[2.3.4.5]}", ss.str()); 171 ares_free_hostent(host); 172 } 173 174 TEST_F(LibraryTest, ParseFullyCompressedName) { 175 std::vector<byte> data = { 176 0x12, 0x34, // qid 177 0x84, // response + query + AA + not-TC + not-RD 178 0x00, // not-RA + not-Z + not-AD + not-CD + rc=NoError 179 0x00, 0x01, // num questions 180 0x00, 0x01, // num answer RRs 181 0x00, 0x00, // num authority RRs 182 0x00, 0x00, // num additional RRs 183 // Question 184 0x03, 'w', 'w', 'w', 185 0x07, 'e', 'x', 'a', 'm', 'p', 'l', 'e', 186 0x03, 'c', 'o', 'm', 187 0x00, 188 0x00, 0x01, // type A 189 0x00, 0x01, // class IN 190 // Answer 1 191 0xc0, 0x0c, // offset 12 192 0x00, 0x01, // RR type 193 0x00, 0x01, // class IN 194 0x01, 0x02, 0x03, 0x04, // TTL 195 0x00, 0x04, // rdata length 196 0x02, 0x03, 0x04, 0x05, 197 }; 198 struct hostent *host = nullptr; 199 struct ares_addrttl info[2]; 200 int count = 2; 201 EXPECT_EQ(ARES_SUCCESS, ares_parse_a_reply(data.data(), (int)data.size(), 202 &host, info, &count)); 203 ASSERT_NE(nullptr, host); 204 std::stringstream ss; 205 ss << HostEnt(host); 206 EXPECT_EQ("{'www.example.com' aliases=[] addrs=[2.3.4.5]}", ss.str()); 207 ares_free_hostent(host); 208 } 209 210 211 } // namespace test 212 } // namespace ares