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/*
* 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, ParseRootName) {
DNSPacket pkt;
pkt.set_qid(0x1234).set_response().set_aa()
.add_question(new DNSQuestion(".", T_A))
.add_answer(new DNSARR(".", 100, {0x02, 0x03, 0x04, 0x05}));
std::vector<byte> data = pkt.data();
struct hostent *host = nullptr;
struct ares_addrttl info[2];
int count = 2;
EXPECT_EQ(ARES_SUCCESS, ares_parse_a_reply(data.data(), data.size(),
&host, info, &count));
EXPECT_EQ(1, count);
std::stringstream ss;
ss << HostEnt(host);
EXPECT_EQ("{'' aliases=[] addrs=[2.3.4.5]}", ss.str());
ares_free_hostent(host);
}
TEST_F(LibraryTest, ParseIndirectRootName) {
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, 0x01, // num answer RRs
0x00, 0x00, // num authority RRs
0x00, 0x00, // num additional RRs
// Question
0xC0, 0x04, // weird: pointer to a random zero earlier in the message
0x00, 0x01, // type A
0x00, 0x01, // class IN
// Answer 1
0xC0, 0x04,
0x00, 0x01, // RR type
0x00, 0x01, // class IN
0x01, 0x02, 0x03, 0x04, // TTL
0x00, 0x04, // rdata length
0x02, 0x03, 0x04, 0x05,
};
struct hostent *host = nullptr;
struct ares_addrttl info[2];
int count = 2;
EXPECT_EQ(ARES_SUCCESS, ares_parse_a_reply(data.data(), data.size(),
&host, info, &count));
EXPECT_EQ(1, count);
std::stringstream ss;
ss << HostEnt(host);
EXPECT_EQ("{'' aliases=[] addrs=[2.3.4.5]}", ss.str());
ares_free_hostent(host);
}
#if 0 /* We are validating hostnames now, its not clear how this would ever be valid */
TEST_F(LibraryTest, ParseEscapedName) {
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, 0x01, // num answer RRs
0x00, 0x00, // num authority RRs
0x00, 0x00, // num additional RRs
// Question
0x05, 'a', '\\', 'b', '.', 'c',
0x03, 'c', 'o', 'm',
0x00,
0x00, 0x01, // type A
0x00, 0x01, // class IN
// Answer 1
0x05, 'a', '\\', 'b', '.', 'c',
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,
};
struct hostent *host = nullptr;
struct ares_addrttl info[2];
int count = 2;
EXPECT_EQ(ARES_SUCCESS, ares_parse_a_reply(data.data(), data.size(),
&host, info, &count));
EXPECT_EQ(1, count);
HostEnt hent(host);
std::stringstream ss;
ss << hent;
// The printable name is expanded with escapes.
EXPECT_EQ(11, hent.name_.size());
EXPECT_EQ('a', hent.name_[0]);
EXPECT_EQ('\\', hent.name_[1]);
EXPECT_EQ('\\', hent.name_[2]);
EXPECT_EQ('b', hent.name_[3]);
EXPECT_EQ('\\', hent.name_[4]);
EXPECT_EQ('.', hent.name_[5]);
EXPECT_EQ('c', hent.name_[6]);
ares_free_hostent(host);
}
#endif
TEST_F(LibraryTest, ParsePartialCompressedName) {
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, 0x01, // num answer RRs
0x00, 0x00, // num authority RRs
0x00, 0x00, // num additional RRs
// Question
0x03, 'w', 'w', 'w',
0x07, 'e', 'x', 'a', 'm', 'p', 'l', 'e',
0x03, 'c', 'o', 'm',
0x00,
0x00, 0x01, // type A
0x00, 0x01, // class IN
// Answer 1
0x03, 'w', 'w', 'w',
0xc0, 0x10, // offset 16
0x00, 0x01, // RR type
0x00, 0x01, // class IN
0x01, 0x02, 0x03, 0x04, // TTL
0x00, 0x04, // rdata length
0x02, 0x03, 0x04, 0x05,
};
struct hostent *host = nullptr;
struct ares_addrttl info[2];
int count = 2;
EXPECT_EQ(ARES_SUCCESS, ares_parse_a_reply(data.data(), data.size(),
&host, info, &count));
ASSERT_NE(nullptr, host);
std::stringstream ss;
ss << HostEnt(host);
EXPECT_EQ("{'www.example.com' aliases=[] addrs=[2.3.4.5]}", ss.str());
ares_free_hostent(host);
}
TEST_F(LibraryTest, ParseFullyCompressedName) {
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, 0x01, // num answer RRs
0x00, 0x00, // num authority RRs
0x00, 0x00, // num additional RRs
// Question
0x03, 'w', 'w', 'w',
0x07, 'e', 'x', 'a', 'm', 'p', 'l', 'e',
0x03, 'c', 'o', 'm',
0x00,
0x00, 0x01, // type A
0x00, 0x01, // class IN
// Answer 1
0xc0, 0x0c, // offset 12
0x00, 0x01, // RR type
0x00, 0x01, // class IN
0x01, 0x02, 0x03, 0x04, // TTL
0x00, 0x04, // rdata length
0x02, 0x03, 0x04, 0x05,
};
struct hostent *host = nullptr;
struct ares_addrttl info[2];
int count = 2;
EXPECT_EQ(ARES_SUCCESS, ares_parse_a_reply(data.data(), data.size(),
&host, info, &count));
ASSERT_NE(nullptr, host);
std::stringstream ss;
ss << HostEnt(host);
EXPECT_EQ("{'www.example.com' aliases=[] addrs=[2.3.4.5]}", ss.str());
ares_free_hostent(host);
}
TEST_F(LibraryTest, ParseFullyCompressedName2) {
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, 0x01, // num answer RRs
0x00, 0x00, // num authority RRs
0x00, 0x00, // num additional RRs
// Question
0xC0, 0x12, // pointer to later in message
0x00, 0x01, // type A
0x00, 0x01, // class IN
// Answer 1
0x03, 'w', 'w', 'w',
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,
};
struct hostent *host = nullptr;
struct ares_addrttl info[2];
int count = 2;
EXPECT_EQ(ARES_SUCCESS, ares_parse_a_reply(data.data(), data.size(),
&host, info, &count));
ASSERT_NE(nullptr, host);
std::stringstream ss;
ss << HostEnt(host);
EXPECT_EQ("{'www.example.com' aliases=[] addrs=[2.3.4.5]}", ss.str());
ares_free_hostent(host);
}
} // namespace test
} // namespace ares
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