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A C library for asynchronous DNS requests (grpc依赖)
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c-ares/test/ares-test-parse-aaaa.cc

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/* MIT License
*
* Copyright (c) The c-ares project and its contributors
*
* Permission is hereby granted, free of charge, to any person obtaining a copy
* of this software and associated documentation files (the "Software"), to deal
* in the Software without restriction, including without limitation the rights
* to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
* copies of the Software, and to permit persons to whom the Software is
* furnished to do so, subject to the following conditions:
*
* The above copyright notice and this permission notice (including the next
* paragraph) shall be included in all copies or substantial portions of the
* Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
* AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
* SOFTWARE.
*
* SPDX-License-Identifier: MIT
*/
#include "ares-test.h"
#include "dns-proto.h"
#include <sstream>
#include <vector>
namespace ares {
namespace test {
TEST_F(LibraryTest, ParseAaaaReplyOK) {
DNSPacket pkt;
pkt.set_qid(0x1234).set_response().set_aa()
.add_question(new DNSQuestion("example.com", T_AAAA))
.add_answer(new DNSAaaaRR("example.com", 100,
{0x01, 0x01, 0x01, 0x01, 0x02, 0x02, 0x02, 0x02,
0x03, 0x03, 0x03, 0x03, 0x04, 0x04, 0x04, 0x04}))
.add_answer(new DNSARR("example.com", 0x01020304, {2,3,4,5}));
std::vector<byte> data = pkt.data();
struct hostent *host = nullptr;
struct ares_addr6ttl info[5];
int count = 5;
EXPECT_EQ(ARES_SUCCESS, ares_parse_aaaa_reply(data.data(), (int)data.size(),
&host, info, &count));
EXPECT_EQ(1, count);
EXPECT_EQ(100, info[0].ttl);
EXPECT_EQ(0x01, info[0].ip6addr._S6_un._S6_u8[0]);
EXPECT_EQ(0x02, info[0].ip6addr._S6_un._S6_u8[4]);
ASSERT_NE(nullptr, host);
std::stringstream ss;
ss << HostEnt(host);
EXPECT_EQ("{'example.com' aliases=[] addrs=[0101:0101:0202:0202:0303:0303:0404:0404]}", ss.str());
ares_free_hostent(host);
// Repeat without providing places to put the results
count = 0;
EXPECT_EQ(ARES_SUCCESS, ares_parse_aaaa_reply(data.data(), (int)data.size(),
nullptr, info, &count));
}
TEST_F(LibraryTest, ParseAaaaReplyCname) {
DNSPacket pkt;
pkt.set_qid(0x1234).set_response().set_aa()
.add_question(new DNSQuestion("example.com", T_AAAA))
.add_answer(new DNSCnameRR("example.com", 50, "c.example.com"))
.add_answer(new DNSAaaaRR("c.example.com", 100,
{0x01, 0x01, 0x01, 0x01, 0x02, 0x02, 0x02, 0x02,
0x03, 0x03, 0x03, 0x03, 0x04, 0x04, 0x04, 0x04}));
std::vector<byte> data = pkt.data();
struct hostent *host = nullptr;
struct ares_addr6ttl info[5];
int count = 5;
EXPECT_EQ(ARES_SUCCESS, ares_parse_aaaa_reply(data.data(), (int)data.size(),
&host, info, &count));
EXPECT_EQ(1, count);
// CNAME TTL overrides AAAA TTL.
EXPECT_EQ(50, info[0].ttl);
EXPECT_EQ(0x01, info[0].ip6addr._S6_un._S6_u8[0]);
EXPECT_EQ(0x02, info[0].ip6addr._S6_un._S6_u8[4]);
ASSERT_NE(nullptr, host);
std::stringstream ss;
ss << HostEnt(host);
EXPECT_EQ("{'c.example.com' aliases=[example.com] addrs=[0101:0101:0202:0202:0303:0303:0404:0404]}", ss.str());
ares_free_hostent(host);
// Repeat without providing a hostent
count = 5;
EXPECT_EQ(ARES_SUCCESS, ares_parse_aaaa_reply(data.data(), (int)data.size(),
nullptr, info, &count));
EXPECT_EQ(1, count);
EXPECT_EQ(50, info[0].ttl);
EXPECT_EQ(0x01, info[0].ip6addr._S6_un._S6_u8[0]);
EXPECT_EQ(0x02, info[0].ip6addr._S6_un._S6_u8[4]);
}
TEST_F(LibraryTest, ParseAaaaReplyNoData) {
DNSPacket pkt;
pkt.set_qid(0x1234).set_response().set_aa()
.add_question(new DNSQuestion("example.com", T_AAAA));
std::vector<byte> data = pkt.data();
struct hostent *host = nullptr;
struct ares_addr6ttl info[2];
int count = 2;
EXPECT_EQ(ARES_ENODATA, ares_parse_aaaa_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"));
EXPECT_EQ(ARES_ENODATA, ares_parse_aaaa_reply(data.data(), (int)data.size(),
&host, info, &count));
EXPECT_EQ(0, count);
EXPECT_EQ(nullptr, host);
}
TEST_F(LibraryTest, ParseAaaaReplyErrors) {
DNSPacket pkt;
pkt.set_qid(0x1234).set_response().set_aa()
.add_question(new DNSQuestion("example.com", T_AAAA))
.add_answer(new DNSAaaaRR("example.com", 100,
{0x01, 0x01, 0x01, 0x01, 0x02, 0x02, 0x02, 0x02,
0x03, 0x03, 0x03, 0x03, 0x04, 0x04, 0x04, 0x04}));
std::vector<byte> data;
struct hostent *host = nullptr;
struct ares_addr6ttl info[2];
int count = 2;
// No question.
pkt.questions_.clear();
data = pkt.data();
EXPECT_EQ(ARES_EBADRESP, ares_parse_aaaa_reply(data.data(), (int)data.size(),
&host, info, &count));
EXPECT_EQ(nullptr, host);
pkt.add_question(new DNSQuestion("example.com", T_AAAA));
// Question != answer
pkt.questions_.clear();
pkt.add_question(new DNSQuestion("Axample.com", T_AAAA));
data = pkt.data();
EXPECT_EQ(ARES_ENODATA, ares_parse_aaaa_reply(data.data(), (int)data.size(),
&host, info, &count));
EXPECT_EQ(nullptr, host);
pkt.questions_.clear();
pkt.add_question(new DNSQuestion("example.com", T_AAAA));
// Two questions.
pkt.add_question(new DNSQuestion("example.com", T_AAAA));
data = pkt.data();
EXPECT_EQ(ARES_EBADRESP, ares_parse_aaaa_reply(data.data(), (int)data.size(),
&host, info, &count));
EXPECT_EQ(nullptr, host);
pkt.questions_.clear();
pkt.add_question(new DNSQuestion("example.com", T_AAAA));
// 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_aaaa_reply(data.data(), (int)data.size(),
&host, info, &count));
EXPECT_EQ(nullptr, host);
pkt.answers_.clear();
pkt.add_answer(new DNSAaaaRR("example.com", 100,
{0x01, 0x01, 0x01, 0x01, 0x02, 0x02, 0x02, 0x02,
0x03, 0x03, 0x03, 0x03, 0x04, 0x04, 0x04, 0x04}));
// No answer.
pkt.answers_.clear();
data = pkt.data();
EXPECT_EQ(ARES_ENODATA, ares_parse_aaaa_reply(data.data(), (int)data.size(),
&host, info, &count));
EXPECT_EQ(nullptr, host);
pkt.add_answer(new DNSAaaaRR("example.com", 100,
{0x01, 0x01, 0x01, 0x01, 0x02, 0x02, 0x02, 0x02,
0x03, 0x03, 0x03, 0x03, 0x04, 0x04, 0x04, 0x04}));
// Truncated packets.
data = pkt.data();
for (size_t len = 1; len < data.size(); len++) {
EXPECT_EQ(ARES_EBADRESP, ares_parse_aaaa_reply(data.data(), (int)len,
&host, info, &count));
EXPECT_EQ(nullptr, host);
EXPECT_EQ(ARES_EBADRESP, ares_parse_aaaa_reply(data.data(), (int)len,
nullptr, info, &count));
}
}
TEST_F(LibraryTest, ParseAaaaReplyAllocFail) {
DNSPacket pkt;
pkt.set_qid(0x1234).set_response().set_aa()
.add_question(new DNSQuestion("example.com", T_AAAA))
.add_answer(new DNSCnameRR("example.com", 300, "c.example.com"))
.add_answer(new DNSAaaaRR("c.example.com", 100,
{0x01, 0x01, 0x01, 0x01, 0x02, 0x02, 0x02, 0x02,
0x03, 0x03, 0x03, 0x03, 0x04, 0x04, 0x04, 0x04}));
std::vector<byte> data = pkt.data();
struct hostent *host = nullptr;
struct ares_addr6ttl info[2];
int count = 2;
for (int ii = 1; ii <= 8; ii++) {
ClearFails();
SetAllocFail(ii);
EXPECT_EQ(ARES_ENOMEM, ares_parse_aaaa_reply(data.data(), (int)data.size(),
&host, info, &count)) << ii;
EXPECT_EQ(nullptr, host);
}
}
} // namespace test
} // namespace ares