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