| /* |
| * Copyright (C) The c-ares project |
| * |
| * Permission to use, copy, modify, and distribute this |
| * software and its documentation for any purpose and without |
| * fee is hereby granted, provided that the above copyright |
| * notice appear in all copies and that both that copyright |
| * notice and this permission notice appear in supporting |
| * documentation, and that the name of M.I.T. not be used in |
| * advertising or publicity pertaining to distribution of the |
| * software without specific, written prior permission. |
| * M.I.T. makes no representations about the suitability of |
| * this software for any purpose. It is provided "as is" |
| * without express or implied warranty. |
| * |
| * SPDX-License-Identifier: MIT |
| */ |
| #include "ares-test.h" |
| #include "dns-proto.h" |
| |
| #include <sstream> |
| #include <vector> |
| |
| namespace ares { |
| namespace test { |
| |
| TEST_F(LibraryTest, ParseAReplyOK) { |
| DNSPacket pkt; |
| pkt.set_qid(0x1234).set_response().set_aa() |
| .add_question(new DNSQuestion("example.com", T_A)) |
| .add_answer(new DNSARR("example.com", 0x01020304, {2,3,4,5})) |
| .add_answer(new DNSAaaaRR("example.com", 0x01020304, {0,0,0,0,0,0,0,0,0,0,0,0,2,3,4,5})); |
| std::vector<byte> data = { |
| 0x12, 0x34, // qid |
| 0x84, // response + query + AA + not-TC + not-RD |
| 0x00, // not-RA + not-Z + not-AD + not-CD + rc=NoError |
| 0x00, 0x01, // num questions |
| 0x00, 0x02, // num answer RRs |
| 0x00, 0x00, // num authority RRs |
| 0x00, 0x00, // num additional RRs |
| // Question |
| 0x07, 'e', 'x', 'a', 'm', 'p', 'l', 'e', |
| 0x03, 'c', 'o', 'm', |
| 0x00, |
| 0x00, 0x01, // type A |
| 0x00, 0x01, // class IN |
| // Answer 1 |
| 0x07, 'e', 'x', 'a', 'm', 'p', 'l', 'e', |
| 0x03, 'c', 'o', 'm', |
| 0x00, |
| 0x00, 0x01, // RR type |
| 0x00, 0x01, // class IN |
| 0x01, 0x02, 0x03, 0x04, // TTL |
| 0x00, 0x04, // rdata length |
| 0x02, 0x03, 0x04, 0x05, |
| // Answer 2 |
| 0x07, 'e', 'x', 'a', 'm', 'p', 'l', 'e', |
| 0x03, 'c', 'o', 'm', |
| 0x00, |
| 0x00, 0x1c, // RR type |
| 0x00, 0x01, // class IN |
| 0x01, 0x02, 0x03, 0x04, // TTL |
| 0x00, 0x10, // rdata length |
| 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x02, 0x03, 0x04, 0x05, |
| }; |
| EXPECT_EQ(data, pkt.data()); |
| struct hostent *host = nullptr; |
| struct ares_addrttl info[5]; |
| int count = 5; |
| EXPECT_EQ(ARES_SUCCESS, ares_parse_a_reply(data.data(), (int)data.size(), |
| &host, info, &count)); |
| EXPECT_EQ(1, count); |
| EXPECT_EQ(0x01020304, info[0].ttl); |
| unsigned long expected_addr = htonl(0x02030405); |
| EXPECT_EQ(expected_addr, info[0].ipaddr.s_addr); |
| EXPECT_EQ("2.3.4.5", AddressToString(&(info[0].ipaddr), 4)); |
| ASSERT_NE(nullptr, host); |
| std::stringstream ss; |
| ss << HostEnt(host); |
| EXPECT_EQ("{'example.com' aliases=[] addrs=[2.3.4.5]}", ss.str()); |
| ares_free_hostent(host); |
| |
| // Repeat without providing a hostent |
| EXPECT_EQ(ARES_SUCCESS, ares_parse_a_reply(data.data(), (int)data.size(), |
| nullptr, info, &count)); |
| EXPECT_EQ(1, count); |
| EXPECT_EQ(0x01020304, info[0].ttl); |
| EXPECT_EQ(expected_addr, info[0].ipaddr.s_addr); |
| EXPECT_EQ("2.3.4.5", AddressToString(&(info[0].ipaddr), 4)); |
| } |
| |
| TEST_F(LibraryTest, ParseMalformedAReply) { |
| std::vector<byte> data = { |
| 0x12, 0x34, // [0:2) qid |
| 0x84, // [2] response + query + AA + not-TC + not-RD |
| 0x00, // [3] not-RA + not-Z + not-AD + not-CD + rc=NoError |
| 0x00, 0x01, // [4:6) num questions |
| 0x00, 0x02, // [6:8) num answer RRs |
| 0x00, 0x00, // [8:10) num authority RRs |
| 0x00, 0x00, // [10:12) num additional RRs |
| // Question |
| 0x07, 'e', 'x', 'a', 'm', 'p', 'l', 'e', // [12:20) |
| 0x03, 'c', 'o', 'm', // [20,24) |
| 0x00, // [24] |
| 0x00, 0x01, // [25:26) type A |
| 0x00, 0x01, // [27:29) class IN |
| // Answer 1 |
| 0x07, 'e', 'x', 'a', 'm', 'p', 'l', 'e', // [29:37) |
| 0x03, 'c', 'o', 'm', // [37:41) |
| 0x00, // [41] |
| 0x00, 0x01, // [42:44) RR type |
| 0x00, 0x01, // [44:46) class IN |
| 0x01, 0x02, 0x03, 0x04, // [46:50) TTL |
| 0x00, 0x04, // [50:52) rdata length |
| 0x02, 0x03, 0x04, 0x05, // [52,56) |
| }; |
| struct hostent *host = nullptr; |
| struct ares_addrttl info[2]; |
| int count = 2; |
| |
| // Invalid RR-len. |
| std::vector<byte> invalid_rrlen(data); |
| invalid_rrlen[51] = 180; |
| EXPECT_EQ(ARES_EBADRESP, ares_parse_a_reply(invalid_rrlen.data(), (int)invalid_rrlen.size(), |
| &host, info, &count)); |
| |
| // Truncate mid-question. |
| EXPECT_EQ(ARES_EBADRESP, ares_parse_a_reply(data.data(), 26, |
| &host, info, &count)); |
| |
| // Truncate mid-answer. |
| EXPECT_EQ(ARES_EBADRESP, ares_parse_a_reply(data.data(), 42, |
| &host, info, &count)); |
| } |
| |
| TEST_F(LibraryTest, ParseAReplyNoData) { |
| DNSPacket pkt; |
| pkt.set_qid(0x1234).set_response().set_aa() |
| .add_question(new DNSQuestion("example.com", T_A)); |
| std::vector<byte> data = pkt.data(); |
| struct hostent *host = nullptr; |
| struct ares_addrttl info[2]; |
| int count = 2; |
| EXPECT_EQ(ARES_ENODATA, ares_parse_a_reply(data.data(), (int)data.size(), |
| &host, info, &count)); |
| EXPECT_EQ(0, count); |
| EXPECT_EQ(nullptr, host); |
| |
| // Again but with a CNAME. |
| pkt.add_answer(new DNSCnameRR("example.com", 200, "c.example.com")); |
| data = pkt.data(); |
| // Expect success as per https://github.com/c-ares/c-ares/commit/2c63440127feed70ccefb148b8f938a2df6c15f8 |
| EXPECT_EQ(ARES_SUCCESS, ares_parse_a_reply(data.data(), (int)data.size(), |
| &host, info, &count)); |
| EXPECT_EQ(0, count); |
| EXPECT_NE(nullptr, host); |
| std::stringstream ss; |
| ss << HostEnt(host); |
| EXPECT_EQ("{'c.example.com' aliases=[example.com] addrs=[]}", ss.str()); |
| ares_free_hostent(host); |
| } |
| |
| TEST_F(LibraryTest, ParseAReplyVariantA) { |
| DNSPacket pkt; |
| pkt.set_qid(6366).set_rd().set_ra() |
| .add_question(new DNSQuestion("mit.edu", T_A)) |
| .add_answer(new DNSARR("mit.edu", 52, {18,7,22,69})) |
| .add_auth(new DNSNsRR("mit.edu", 292, "W20NS.mit.edu")) |
| .add_auth(new DNSNsRR("mit.edu", 292, "BITSY.mit.edu")) |
| .add_auth(new DNSNsRR("mit.edu", 292, "STRAWB.mit.edu")) |
| .add_additional(new DNSARR("STRAWB.mit.edu", 292, {18,71,0,151})); |
| struct hostent *host = nullptr; |
| struct ares_addrttl info[2]; |
| int count = 2; |
| std::vector<byte> data = pkt.data(); |
| EXPECT_EQ(ARES_SUCCESS, ares_parse_a_reply(data.data(), (int)data.size(), |
| &host, info, &count)); |
| EXPECT_EQ(1, count); |
| EXPECT_EQ("18.7.22.69", AddressToString(&(info[0].ipaddr), 4)); |
| EXPECT_EQ(52, info[0].ttl); |
| ares_free_hostent(host); |
| } |
| |
| TEST_F(LibraryTest, ParseAReplyJustCname) { |
| DNSPacket pkt; |
| pkt.set_qid(6366).set_rd().set_ra() |
| .add_question(new DNSQuestion("mit.edu", T_A)) |
| .add_answer(new DNSCnameRR("mit.edu", 52, "other.mit.edu")); |
| struct hostent *host = nullptr; |
| struct ares_addrttl info[2]; |
| int count = 2; |
| std::vector<byte> data = pkt.data(); |
| EXPECT_EQ(ARES_SUCCESS, ares_parse_a_reply(data.data(), (int)data.size(), |
| &host, info, &count)); |
| EXPECT_EQ(0, count); |
| ASSERT_NE(nullptr, host); |
| std::stringstream ss; |
| ss << HostEnt(host); |
| EXPECT_EQ("{'other.mit.edu' aliases=[mit.edu] addrs=[]}", ss.str()); |
| ares_free_hostent(host); |
| } |
| |
| TEST_F(LibraryTest, ParseAReplyVariantCname) { |
| DNSPacket pkt; |
| pkt.set_qid(6366).set_rd().set_ra() |
| .add_question(new DNSQuestion("query.example.com", T_A)) |
| .add_answer(new DNSCnameRR("query.example.com", 200, "redirect.query.example.com")) |
| .add_answer(new DNSARR("redirect.query.example.com", 300, {129,97,123,22})) |
| .add_auth(new DNSNsRR("example.com", 218, "aa.ns1.example.com")) |
| .add_auth(new DNSNsRR("example.com", 218, "ns2.example.com")) |
| .add_auth(new DNSNsRR("example.com", 218, "ns3.example.com")) |
| .add_auth(new DNSNsRR("example.com", 218, "ns4.example.com")) |
| .add_additional(new DNSARR("aa.ns1.example.com", 218, {129,97,1,1})) |
| .add_additional(new DNSARR("ns2.example.com", 218, {129,97,1,2})) |
| .add_additional(new DNSARR("ns3.example.com", 218, {129,97,1,3})) |
| .add_additional(new DNSARR("ns4.example.com", 218, {129,97,1,4})); |
| struct hostent *host = nullptr; |
| struct ares_addrttl info[2]; |
| int count = 2; |
| std::vector<byte> data = pkt.data(); |
| EXPECT_EQ(ARES_SUCCESS, ares_parse_a_reply(data.data(), (int)data.size(), |
| &host, info, &count)); |
| EXPECT_EQ(1, count); |
| EXPECT_EQ("129.97.123.22", AddressToString(&(info[0].ipaddr), 4)); |
| // TTL is reduced to match CNAME's. |
| EXPECT_EQ(200, info[0].ttl); |
| ares_free_hostent(host); |
| |
| // Repeat parsing without places to put the results. |
| count = 0; |
| EXPECT_EQ(ARES_SUCCESS, ares_parse_a_reply(data.data(), (int)data.size(), |
| nullptr, info, &count)); |
| } |
| |
| TEST_F(LibraryTest, ParseAReplyVariantCnameChain) { |
| DNSPacket pkt; |
| pkt.set_qid(6366).set_rd().set_ra() |
| .add_question(new DNSQuestion("c1.localhost", T_A)) |
| .add_answer(new DNSCnameRR("c1.localhost", 604800, "c2.localhost")) |
| .add_answer(new DNSCnameRR("c2.localhost", 604800, "c3.localhost")) |
| .add_answer(new DNSCnameRR("c3.localhost", 604800, "c4.localhost")) |
| .add_answer(new DNSARR("c4.localhost", 604800, {8,8,8,8})) |
| .add_auth(new DNSNsRR("localhost", 604800, "localhost")) |
| .add_additional(new DNSARR("localhost", 604800, {127,0,0,1})) |
| .add_additional(new DNSAaaaRR("localhost", 604800, |
| {0x7F, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, |
| 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x01})); |
| struct hostent *host = nullptr; |
| struct ares_addrttl info[2]; |
| int count = 2; |
| std::vector<byte> data = pkt.data(); |
| EXPECT_EQ(ARES_SUCCESS, ares_parse_a_reply(data.data(), (int)data.size(), |
| &host, info, &count)); |
| EXPECT_EQ(1, count); |
| EXPECT_EQ("8.8.8.8", AddressToString(&(info[0].ipaddr), 4)); |
| EXPECT_EQ(604800, info[0].ttl); |
| ares_free_hostent(host); |
| } |
| |
| TEST_F(LibraryTest, DISABLED_ParseAReplyVariantCnameLast) { |
| DNSPacket pkt; |
| pkt.set_qid(6366).set_rd().set_ra() |
| .add_question(new DNSQuestion("query.example.com", T_A)) |
| .add_answer(new DNSARR("redirect.query.example.com", 300, {129,97,123,221})) |
| .add_answer(new DNSARR("redirect.query.example.com", 300, {129,97,123,222})) |
| .add_answer(new DNSARR("redirect.query.example.com", 300, {129,97,123,223})) |
| .add_answer(new DNSARR("redirect.query.example.com", 300, {129,97,123,224})) |
| .add_answer(new DNSCnameRR("query.example.com", 60, "redirect.query.example.com")) |
| .add_additional(new DNSTxtRR("query.example.com", 60, {"text record"})); |
| struct hostent *host = nullptr; |
| struct ares_addrttl info[8]; |
| int count = 8; |
| std::vector<byte> data = pkt.data(); |
| EXPECT_EQ(ARES_SUCCESS, ares_parse_a_reply(data.data(), (int)data.size(), |
| &host, info, &count)); |
| EXPECT_EQ(4, count); |
| EXPECT_EQ("129.97.123.221", AddressToString(&(info[0].ipaddr), 4)); |
| EXPECT_EQ("129.97.123.222", AddressToString(&(info[1].ipaddr), 4)); |
| EXPECT_EQ("129.97.123.223", AddressToString(&(info[2].ipaddr), 4)); |
| EXPECT_EQ("129.97.123.224", AddressToString(&(info[3].ipaddr), 4)); |
| EXPECT_EQ(300, info[0].ttl); |
| EXPECT_EQ(300, info[1].ttl); |
| EXPECT_EQ(300, info[2].ttl); |
| EXPECT_EQ(300, info[3].ttl); |
| ares_free_hostent(host); |
| } |
| |
| TEST_F(LibraryTest, ParseAReplyErrors) { |
| DNSPacket pkt; |
| pkt.set_qid(0x1234).set_response().set_aa() |
| .add_question(new DNSQuestion("example.com", T_A)) |
| .add_answer(new DNSARR("example.com", 100, {0x02, 0x03, 0x04, 0x05})); |
| std::vector<byte> data; |
| |
| struct hostent *host = nullptr; |
| struct ares_addrttl info[2]; |
| int count = 2; |
| |
| // No question. |
| pkt.questions_.clear(); |
| data = pkt.data(); |
| EXPECT_EQ(ARES_EBADRESP, ares_parse_a_reply(data.data(), (int)data.size(), |
| &host, info, &count)); |
| EXPECT_EQ(nullptr, host); |
| pkt.add_question(new DNSQuestion("example.com", T_A)); |
| |
| // Question != answer, this is ok as of Issue #683 |
| pkt.questions_.clear(); |
| pkt.add_question(new DNSQuestion("Axample.com", T_A)); |
| data = pkt.data(); |
| EXPECT_EQ(ARES_SUCCESS, ares_parse_a_reply(data.data(), (int)data.size(), |
| &host, info, &count)); |
| ASSERT_NE(nullptr, host); |
| std::stringstream ss; |
| ss << HostEnt(host); |
| EXPECT_EQ("{'Axample.com' aliases=[] addrs=[2.3.4.5]}", ss.str()); |
| ares_free_hostent(host); |
| host = nullptr; |
| |
| pkt.questions_.clear(); |
| pkt.add_question(new DNSQuestion("example.com", T_A)); |
| |
| #ifdef DISABLED |
| // Not a response. |
| pkt.set_response(false); |
| data = pkt.data(); |
| EXPECT_EQ(ARES_EBADRESP, ares_parse_a_reply(data.data(), (int)data.size(), |
| &host, info, &count)); |
| EXPECT_EQ(nullptr, host); |
| pkt.set_response(true); |
| |
| // Bad return code. |
| pkt.set_rcode(FORMERR); |
| data = pkt.data(); |
| EXPECT_EQ(ARES_ENODATA, ares_parse_a_reply(data.data(), (int)data.size(), |
| &host, info, &count)); |
| EXPECT_EQ(nullptr, host); |
| pkt.set_rcode(NOERROR); |
| #endif |
| |
| // Two questions |
| pkt.add_question(new DNSQuestion("example.com", T_A)); |
| data = pkt.data(); |
| EXPECT_EQ(ARES_EBADRESP, ares_parse_a_reply(data.data(), (int)data.size(), |
| &host, info, &count)); |
| EXPECT_EQ(nullptr, host); |
| pkt.questions_.clear(); |
| pkt.add_question(new DNSQuestion("example.com", T_A)); |
| |
| // Wrong sort of answer. |
| pkt.answers_.clear(); |
| pkt.add_answer(new DNSMxRR("example.com", 100, 100, "mx1.example.com")); |
| data = pkt.data(); |
| EXPECT_EQ(ARES_ENODATA, ares_parse_a_reply(data.data(), (int)data.size(), |
| &host, info, &count)); |
| EXPECT_EQ(nullptr, host); |
| pkt.answers_.clear(); |
| pkt.add_answer(new DNSARR("example.com", 100, {0x02, 0x03, 0x04, 0x05})); |
| |
| // No answer. |
| pkt.answers_.clear(); |
| data = pkt.data(); |
| EXPECT_EQ(ARES_ENODATA, ares_parse_a_reply(data.data(), (int)data.size(), |
| &host, info, &count)); |
| EXPECT_EQ(nullptr, host); |
| pkt.add_answer(new DNSARR("example.com", 100, {0x02, 0x03, 0x04, 0x05})); |
| |
| // Truncated packets. |
| data = pkt.data(); |
| for (size_t len = 1; len < data.size(); len++) { |
| EXPECT_EQ(ARES_EBADRESP, ares_parse_a_reply(data.data(), (int)len, |
| &host, info, &count)); |
| EXPECT_EQ(nullptr, host); |
| EXPECT_EQ(ARES_EBADRESP, ares_parse_a_reply(data.data(), (int)len, |
| nullptr, info, &count)); |
| } |
| } |
| |
| TEST_F(LibraryTest, ParseAReplyAllocFail) { |
| DNSPacket pkt; |
| pkt.set_qid(0x1234).set_response().set_aa() |
| .add_question(new DNSQuestion("example.com", T_A)) |
| .add_answer(new DNSCnameRR("example.com", 300, "c.example.com")) |
| .add_answer(new DNSARR("c.example.com", 500, {0x02, 0x03, 0x04, 0x05})); |
| std::vector<byte> data = pkt.data(); |
| |
| struct hostent *host = nullptr; |
| struct ares_addrttl info[2]; |
| int count = 2; |
| |
| for (int ii = 1; ii <= 8; ii++) { |
| ClearFails(); |
| SetAllocFail(ii); |
| EXPECT_EQ(ARES_ENOMEM, ares_parse_a_reply(data.data(), (int)data.size(), |
| &host, info, &count)) << ii; |
| EXPECT_EQ(nullptr, host); |
| } |
| } |
| |
| } // namespace test |
| } // namespace ares |
