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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, ParseTxtReplyOK) {
DNSPacket pkt;
std::string expected1 = "txt1.example.com";
std::string expected2a = "txt2a";
std::string expected2b("ABC\0ABC", 7);
pkt.set_qid(0x1234).set_response().set_aa()
.add_question(new DNSQuestion("example.com", T_MX))
.add_answer(new DNSTxtRR("example.com", 100, {expected1}))
.add_answer(new DNSTxtRR("example.com", 100, {expected2a, expected2b}));
std::vector<byte> data = pkt.data();
struct ares_txt_reply* txt = nullptr;
EXPECT_EQ(ARES_SUCCESS, ares_parse_txt_reply(data.data(), data.size(), &txt));
ASSERT_NE(nullptr, txt);
EXPECT_EQ(std::vector<byte>(expected1.data(), expected1.data() + expected1.size()),
std::vector<byte>(txt->txt, txt->txt + txt->length));
struct ares_txt_reply* txt2 = txt->next;
ASSERT_NE(nullptr, txt2);
EXPECT_EQ(std::vector<byte>(expected2a.data(), expected2a.data() + expected2a.size()),
std::vector<byte>(txt2->txt, txt2->txt + txt2->length));
struct ares_txt_reply* txt3 = txt2->next;
ASSERT_NE(nullptr, txt3);
EXPECT_EQ(std::vector<byte>(expected2b.data(), expected2b.data() + expected2b.size()),
std::vector<byte>(txt3->txt, txt3->txt + txt3->length));
EXPECT_EQ(nullptr, txt3->next);
ares_free_data(txt);
}
TEST_F(LibraryTest, ParseTxtExtReplyOK) {
DNSPacket pkt;
std::string expected1 = "txt1.example.com";
std::string expected2a = "txt2a";
std::string expected2b("ABC\0ABC", 7);
pkt.set_qid(0x1234).set_response().set_aa()
.add_question(new DNSQuestion("example.com", T_MX))
.add_answer(new DNSTxtRR("example.com", 100, {expected1}))
.add_answer(new DNSTxtRR("example.com", 100, {expected2a, expected2b}));
std::vector<byte> data = pkt.data();
struct ares_txt_ext* txt = nullptr;
EXPECT_EQ(ARES_SUCCESS, ares_parse_txt_reply_ext(data.data(), data.size(), &txt));
ASSERT_NE(nullptr, txt);
EXPECT_EQ(std::vector<byte>(expected1.data(), expected1.data() + expected1.size()),
std::vector<byte>(txt->txt, txt->txt + txt->length));
EXPECT_EQ(1, txt->record_start);
struct ares_txt_ext* txt2 = txt->next;
ASSERT_NE(nullptr, txt2);
EXPECT_EQ(std::vector<byte>(expected2a.data(), expected2a.data() + expected2a.size()),
std::vector<byte>(txt2->txt, txt2->txt + txt2->length));
EXPECT_EQ(1, txt2->record_start);
struct ares_txt_ext* txt3 = txt2->next;
ASSERT_NE(nullptr, txt3);
EXPECT_EQ(std::vector<byte>(expected2b.data(), expected2b.data() + expected2b.size()),
std::vector<byte>(txt3->txt, txt3->txt + txt3->length));
EXPECT_EQ(nullptr, txt3->next);
EXPECT_EQ(0, txt3->record_start);
ares_free_data(txt);
}
TEST_F(LibraryTest, ParseTxtMalformedReply1) {
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
0x07, 'e', 'x', 'a', 'm', 'p', 'l', 'e',
0x03, 'c', 'o', 'm',
0x00,
0x00, 0x10, // type TXT
0x00, 0x01, // class IN
// Answer 1
0x07, 'e', 'x', 'a', 'm', 'p', 'l', 'e',
0x03, 'c', 'o', 'm',
0x00,
0x00, 0x10, // RR type
0x00, 0x01, // class IN
0x01, 0x02, 0x03, 0x04, // TTL
0x00, 0x03, // rdata length
0x12, 'a', 'b', // invalid length
};
struct ares_txt_reply* txt = nullptr;
EXPECT_EQ(ARES_EBADRESP, ares_parse_txt_reply(data.data(), data.size(), &txt));
ASSERT_EQ(nullptr, txt);
}
TEST_F(LibraryTest, ParseTxtMalformedReply2) {
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
0x07, 'e', 'x', 'a', 'm', 'p', 'l', 'e',
0x03, 'c', 'o', 'm',
0x00,
0x00, 0x10, // type TXT
0x00, 0x01, // class IN
// Answer 1
0x07, 'e', 'x', 'a', 'm', 'p', 'l', 'e',
0x03, 'c', 'o', 'm',
0x00,
0x00, 0x10, // RR type
// truncated
};
struct ares_txt_reply* txt = nullptr;
EXPECT_EQ(ARES_EBADRESP, ares_parse_txt_reply(data.data(), data.size(), &txt));
ASSERT_EQ(nullptr, txt);
}
TEST_F(LibraryTest, ParseTxtMalformedReply3) {
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
0x07, 'e', 'x', 'a', 'm', 'p', 'l', 'e',
0x03, 'c', 'o', 'm',
0x00,
0x00, 0x10, // type TXT
0x00, 0x01, // class IN
// Answer 1
0x07, 'e', 'x', 'a', 'm', 'p', 'l', 'e',
0x03, 'c', 'o', 'm',
0x00,
0x00, 0x10, // RR type
0x00, 0x01, // class IN
0x01, 0x02, 0x03, 0x04, // TTL
0x00, 0x13, // rdata length INVALID
0x02, 'a', 'b',
};
struct ares_txt_reply* txt = nullptr;
EXPECT_EQ(ARES_EBADRESP, ares_parse_txt_reply(data.data(), data.size(), &txt));
ASSERT_EQ(nullptr, txt);
}
TEST_F(LibraryTest, ParseTxtMalformedReply4) {
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
0x07, 'e', 'x', 'a', 'm', 'p', 'l', 'e',
0x03, 'c', 'o', 'm',
0x00,
0x00, 0x10, // type TXT
0x00, // TRUNCATED
};
struct ares_txt_reply* txt = nullptr;
EXPECT_EQ(ARES_EBADRESP, ares_parse_txt_reply(data.data(), data.size(), &txt));
ASSERT_EQ(nullptr, txt);
}
TEST_F(LibraryTest, ParseTxtReplyErrors) {
DNSPacket pkt;
std::string expected1 = "txt1.example.com";
std::string expected2a = "txt2a";
std::string expected2b = "txt2b";
pkt.set_qid(0x1234).set_response().set_aa()
.add_question(new DNSQuestion("example.com", T_MX))
.add_answer(new DNSTxtRR("example.com", 100, {expected1}))
.add_answer(new DNSTxtRR("example.com", 100, {expected1}))
.add_answer(new DNSTxtRR("example.com", 100, {expected2a, expected2b}));
std::vector<byte> data = pkt.data();
struct ares_txt_reply* txt = nullptr;
// No question.
pkt.questions_.clear();
data = pkt.data();
txt = nullptr;
EXPECT_EQ(ARES_EBADRESP, ares_parse_txt_reply(data.data(), data.size(), &txt));
EXPECT_EQ(nullptr, txt);
pkt.add_question(new DNSQuestion("example.com", T_MX));
#ifdef DISABLED
// Question != answer
pkt.questions_.clear();
pkt.add_question(new DNSQuestion("Axample.com", T_TXT));
data = pkt.data();
EXPECT_EQ(ARES_ENODATA, ares_parse_txt_reply(data.data(), data.size(), &txt));
pkt.questions_.clear();
pkt.add_question(new DNSQuestion("example.com", T_TXT));
#endif
// Two questions.
pkt.add_question(new DNSQuestion("example.com", T_MX));
data = pkt.data();
txt = nullptr;
EXPECT_EQ(ARES_EBADRESP, ares_parse_txt_reply(data.data(), data.size(), &txt));
EXPECT_EQ(nullptr, txt);
pkt.questions_.clear();
pkt.add_question(new DNSQuestion("example.com", T_MX));
// No answer.
pkt.answers_.clear();
data = pkt.data();
txt = nullptr;
EXPECT_EQ(ARES_ENODATA, ares_parse_txt_reply(data.data(), data.size(), &txt));
EXPECT_EQ(nullptr, txt);
pkt.add_answer(new DNSTxtRR("example.com", 100, {expected1}));
// Truncated packets.
for (size_t len = 1; len < data.size(); len++) {
txt = nullptr;
EXPECT_NE(ARES_SUCCESS, ares_parse_txt_reply(data.data(), len, &txt));
EXPECT_EQ(nullptr, txt);
}
}
TEST_F(LibraryTest, ParseTxtReplyAllocFail) {
DNSPacket pkt;
std::string expected1 = "txt1.example.com";
std::string expected2a = "txt2a";
std::string expected2b = "txt2b";
pkt.set_qid(0x1234).set_response().set_aa()
.add_question(new DNSQuestion("example.com", T_MX))
.add_answer(new DNSCnameRR("example.com", 300, "c.example.com"))
.add_answer(new DNSTxtRR("c.example.com", 100, {expected1}))
.add_answer(new DNSTxtRR("c.example.com", 100, {expected1}))
.add_answer(new DNSTxtRR("c.example.com", 100, {expected2a, expected2b}));
std::vector<byte> data = pkt.data();
struct ares_txt_reply* txt = nullptr;
for (int ii = 1; ii <= 13; ii++) {
ClearFails();
SetAllocFail(ii);
EXPECT_EQ(ARES_ENOMEM, ares_parse_txt_reply(data.data(), data.size(), &txt)) << ii;
}
}
} // namespace test
} // namespace ares
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