summaryrefslogtreecommitdiff
path: root/test/ares-test-parse-a.cc
diff options
context:
space:
mode:
Diffstat (limited to 'test/ares-test-parse-a.cc')
-rw-r--r--test/ares-test-parse-a.cc378
1 files changed, 378 insertions, 0 deletions
diff --git a/test/ares-test-parse-a.cc b/test/ares-test-parse-a.cc
new file mode 100644
index 0000000..7f6a987
--- /dev/null
+++ b/test/ares-test-parse-a.cc
@@ -0,0 +1,378 @@
+#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", ns_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(), 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(), 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(), 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", ns_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(), 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(), 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", ns_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(), 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", ns_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(), 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", ns_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(), 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(), 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", ns_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(), 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", ns_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(), 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", ns_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(), data.size(),
+ &host, info, &count));
+ EXPECT_EQ(nullptr, host);
+ pkt.add_question(new DNSQuestion("example.com", ns_t_a));
+
+ // Question != answer
+ pkt.questions_.clear();
+ pkt.add_question(new DNSQuestion("Axample.com", ns_t_a));
+ data = pkt.data();
+ EXPECT_EQ(ARES_ENODATA, ares_parse_a_reply(data.data(), data.size(),
+ &host, info, &count));
+ EXPECT_EQ(nullptr, host);
+ pkt.questions_.clear();
+ pkt.add_question(new DNSQuestion("example.com", ns_t_a));
+
+#ifdef DISABLED
+ // Not a response.
+ pkt.set_response(false);
+ data = pkt.data();
+ EXPECT_EQ(ARES_EBADRESP, ares_parse_a_reply(data.data(), data.size(),
+ &host, info, &count));
+ EXPECT_EQ(nullptr, host);
+ pkt.set_response(true);
+
+ // Bad return code.
+ pkt.set_rcode(ns_r_formerr);
+ data = pkt.data();
+ EXPECT_EQ(ARES_ENODATA, ares_parse_a_reply(data.data(), data.size(),
+ &host, info, &count));
+ EXPECT_EQ(nullptr, host);
+ pkt.set_rcode(ns_r_noerror);
+#endif
+
+ // Two questions
+ pkt.add_question(new DNSQuestion("example.com", ns_t_a));
+ data = pkt.data();
+ EXPECT_EQ(ARES_EBADRESP, ares_parse_a_reply(data.data(), data.size(),
+ &host, info, &count));
+ EXPECT_EQ(nullptr, host);
+ pkt.questions_.clear();
+ pkt.add_question(new DNSQuestion("example.com", ns_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(), 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(), 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(), len,
+ &host, info, &count));
+ EXPECT_EQ(nullptr, host);
+ EXPECT_EQ(ARES_EBADRESP, ares_parse_a_reply(data.data(), len,
+ nullptr, info, &count));
+ }
+}
+
+TEST_F(LibraryTest, ParseAReplyAllocFail) {
+ DNSPacket pkt;
+ pkt.set_qid(0x1234).set_response().set_aa()
+ .add_question(new DNSQuestion("example.com", ns_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(), data.size(),
+ &host, info, &count)) << ii;
+ EXPECT_EQ(nullptr, host);
+ }
+}
+
+} // namespace test
+} // namespace ares
generated by cgit v1.2.3 (git 2.25.1) at 2024-11-25 14:12:28 +0000