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// Copyright (c) 2011 The Chromium Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#include "net/dns/dns_query.h"
#include <tuple>
#include "base/stl_util.h"
#include "net/base/io_buffer.h"
#include "net/dns/dns_util.h"
#include "net/dns/public/dns_protocol.h"
#include "net/dns/record_rdata.h"
#include "testing/gmock/include/gmock/gmock.h"
#include "testing/gtest/include/gtest/gtest.h"
namespace net {
namespace {
using ::testing::ElementsAreArray;
std::tuple<char*, size_t> AsTuple(const IOBufferWithSize* buf) {
return std::make_tuple(buf->data(), buf->size());
}
bool ParseAndCreateDnsQueryFromRawPacket(const uint8_t* data,
size_t length,
std::unique_ptr<DnsQuery>* out) {
auto packet = base::MakeRefCounted<IOBufferWithSize>(length);
memcpy(packet->data(), data, length);
out->reset(new DnsQuery(packet));
return (*out)->Parse(length);
}
// This includes \0 at the end.
const char kQNameData[] =
"\x03"
"www"
"\x07"
"example"
"\x03"
"com";
const base::StringPiece kQName(kQNameData, sizeof(kQNameData));
TEST(DnsQueryTest, Constructor) {
// This includes \0 at the end.
const uint8_t query_data[] = {
// Header
0xbe, 0xef, 0x01, 0x00, // Flags -- set RD (recursion desired) bit.
0x00, 0x01, // Set QDCOUNT (question count) to 1, all the
// rest are 0 for a query.
0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
// Question
0x03, 'w', 'w', 'w', // QNAME: www.example.com in DNS format.
0x07, 'e', 'x', 'a', 'm', 'p', 'l', 'e', 0x03, 'c', 'o', 'm', 0x00,
0x00, 0x01, // QTYPE: A query.
0x00, 0x01, // QCLASS: IN class.
};
DnsQuery q1(0xbeef, kQName, dns_protocol::kTypeA);
EXPECT_EQ(dns_protocol::kTypeA, q1.qtype());
EXPECT_THAT(AsTuple(q1.io_buffer()), ElementsAreArray(query_data));
EXPECT_EQ(kQName, q1.qname());
base::StringPiece question(reinterpret_cast<const char*>(query_data) + 12,
21);
EXPECT_EQ(question, q1.question());
}
TEST(DnsQueryTest, Clone) {
base::StringPiece qname(kQNameData, sizeof(kQNameData));
DnsQuery q1(0, qname, dns_protocol::kTypeA);
EXPECT_EQ(0, q1.id());
std::unique_ptr<DnsQuery> q2 = q1.CloneWithNewId(42);
EXPECT_EQ(42, q2->id());
EXPECT_EQ(q1.io_buffer()->size(), q2->io_buffer()->size());
EXPECT_EQ(q1.qtype(), q2->qtype());
EXPECT_EQ(q1.question(), q2->question());
}
TEST(DnsQueryTest, EDNS0) {
const uint8_t query_data[] = {
// Header
0xbe, 0xef, 0x01, 0x00, // Flags -- set RD (recursion desired) bit.
// Set QDCOUNT (question count) and ARCOUNT (additional count) to 1, all
// the rest are 0 for a query.
0x00, 0x01, 0x00, 0x00, 0x00, 0x00, 0x00, 0x01,
// Question
0x03, 'w', 'w', 'w', // QNAME: www.example.com in DNS format.
0x07, 'e', 'x', 'a', 'm', 'p', 'l', 'e', 0x03, 'c', 'o', 'm', 0x00,
0x00, 0x01, // QTYPE: A query.
0x00, 0x01, // QCLASS: IN class.
// Additional
0x00, // QNAME: empty (root domain)
0x00, 0x29, // TYPE: OPT
0x10, 0x00, // CLASS: max UDP payload size
0x00, 0x00, 0x00, 0x00, // TTL: rcode, version and flags
0x00, 0x08, // RDATA length
0x00, 0xFF, // OPT code
0x00, 0x04, // OPT data size
0xDE, 0xAD, 0xBE, 0xEF // OPT data
};
base::StringPiece qname(kQNameData, sizeof(kQNameData));
OptRecordRdata opt_rdata;
opt_rdata.AddOpt(OptRecordRdata::Opt(255, "\xde\xad\xbe\xef"));
DnsQuery q1(0xbeef, qname, dns_protocol::kTypeA, &opt_rdata);
EXPECT_EQ(dns_protocol::kTypeA, q1.qtype());
EXPECT_THAT(AsTuple(q1.io_buffer()), ElementsAreArray(query_data));
base::StringPiece question(reinterpret_cast<const char*>(query_data) + 12,
21);
EXPECT_EQ(question, q1.question());
}
TEST(DnsQueryTest, Block128Padding) {
DnsQuery query(46 /* id */, kQName, dns_protocol::kTypeAAAA,
nullptr /* opt_rdata */,
DnsQuery::PaddingStrategy::BLOCK_LENGTH_128);
// Query is expected to be short and fit in a single 128-byte padded block.
EXPECT_EQ(128, query.io_buffer()->size());
// Ensure created query still parses as expected.
DnsQuery parsed_query(query.io_buffer());
ASSERT_TRUE(parsed_query.Parse(query.io_buffer()->size()));
EXPECT_EQ(kQName, parsed_query.qname());
EXPECT_EQ(dns_protocol::kTypeAAAA, parsed_query.qtype());
}
TEST(DnsQueryTest, Block128Padding_LongName) {
std::string qname;
DNSDomainFromDot(
"really.long.domain.name.that.will.push.us.past.the.128.byte.block.size."
"because.it.would.be.nice.to.test.something.realy.long.like.that.com",
&qname);
DnsQuery query(112 /* id */, qname, dns_protocol::kTypeAAAA,
nullptr /* opt_rdata */,
DnsQuery::PaddingStrategy::BLOCK_LENGTH_128);
// Query is expected to pad into a second 128-byte block.
EXPECT_EQ(256, query.io_buffer()->size());
EXPECT_EQ(qname, query.qname());
// Ensure created query still parses as expected.
DnsQuery parsed_query(query.io_buffer());
ASSERT_TRUE(parsed_query.Parse(query.io_buffer()->size()));
EXPECT_EQ(qname, parsed_query.qname());
EXPECT_EQ(dns_protocol::kTypeAAAA, parsed_query.qtype());
}
TEST(DnsQueryParseTest, SingleQuestionForTypeARecord) {
const uint8_t query_data[] = {
0x12, 0x34, // ID
0x00, 0x00, // flags
0x00, 0x01, // number of questions
0x00, 0x00, // number of answer rr
0x00, 0x00, // number of name server rr
0x00, 0x00, // number of additional rr
0x03, 'w', 'w', 'w', 0x07, 'e', 'x', 'a',
'm', 'p', 'l', 'e', 0x03, 'c', 'o', 'm',
0x00, // null label
0x00, 0x01, // type A Record
0x00, 0x01, // class IN
};
std::unique_ptr<DnsQuery> query;
EXPECT_TRUE(ParseAndCreateDnsQueryFromRawPacket(query_data,
sizeof(query_data), &query));
EXPECT_EQ(0x1234, query->id());
base::StringPiece qname(kQNameData, sizeof(kQNameData));
EXPECT_EQ(qname, query->qname());
EXPECT_EQ(dns_protocol::kTypeA, query->qtype());
}
TEST(DnsQueryParseTest, SingleQuestionForTypeAAAARecord) {
const uint8_t query_data[] = {
0x12, 0x34, // ID
0x00, 0x00, // flags
0x00, 0x01, // number of questions
0x00, 0x00, // number of answer rr
0x00, 0x00, // number of name server rr
0x00, 0x00, // number of additional rr
0x03, 'w', 'w', 'w', 0x07, 'e', 'x', 'a',
'm', 'p', 'l', 'e', 0x03, 'c', 'o', 'm',
0x00, // null label
0x00, 0x1c, // type AAAA Record
0x00, 0x01, // class IN
};
std::unique_ptr<DnsQuery> query;
EXPECT_TRUE(ParseAndCreateDnsQueryFromRawPacket(query_data,
sizeof(query_data), &query));
EXPECT_EQ(0x1234, query->id());
base::StringPiece qname(kQNameData, sizeof(kQNameData));
EXPECT_EQ(qname, query->qname());
EXPECT_EQ(dns_protocol::kTypeAAAA, query->qtype());
}
const uint8_t kQueryTruncatedQuestion[] = {
0x12, 0x34, // ID
0x00, 0x00, // flags
0x00, 0x02, // number of questions
0x00, 0x00, // number of answer rr
0x00, 0x00, // number of name server rr
0x00, 0x00, // number of additional rr
0x03, 'w', 'w', 'w', 0x07, 'e', 'x', 'a',
'm', 'p', 'l', 'e', 0x03, 'c', 'o', 'm',
0x00, // null label
0x00, 0x01, // type A Record
0x00, // class IN, truncated
};
const uint8_t kQueryTwoQuestions[] = {
0x12, 0x34, // ID
0x00, 0x00, // flags
0x00, 0x02, // number of questions
0x00, 0x00, // number of answer rr
0x00, 0x00, // number of name server rr
0x00, 0x00, // number of additional rr
0x03, 'w', 'w', 'w', 0x07, 'e', 'x', 'a', 'm', 'p', 'l', 'e',
0x03, 'c', 'o', 'm',
0x00, // null label
0x00, 0x01, // type A Record
0x00, 0x01, // class IN
0x07, 'e', 'x', 'a', 'm', 'p', 'l', 'e', 0x03, 'o', 'r', 'g',
0x00, // null label
0x00, 0x1c, // type AAAA Record
0x00, 0x01, // class IN
};
const uint8_t kQueryInvalidDNSDomainName1[] = {
0x12, 0x34, // ID
0x00, 0x00, // flags
0x00, 0x01, // number of questions
0x00, 0x00, // number of answer rr
0x00, 0x00, // number of name server rr
0x00, 0x00, // number of additional rr
0x02, 'w', 'w', 'w', // wrong label length
0x07, 'e', 'x', 'a', 'm', 'p', 'l', 'e', 0x03, 'c', 'o', 'm',
0x00, // null label
0x00, 0x01, // type A Record
0x00, 0x01, // class IN
};
const uint8_t kQueryInvalidDNSDomainName2[] = {
0x12, 0x34, // ID
0x00, 0x00, // flags
0x00, 0x01, // number of questions
0x00, 0x00, // number of answer rr
0x00, 0x00, // number of name server rr
0x00, 0x00, // number of additional rr
0xc0, 0x02, // illegal name pointer
0x00, 0x01, // type A Record
0x00, 0x01, // class IN
};
TEST(DnsQueryParseTest, FailsInvalidQueries) {
const struct TestCase {
const uint8_t* data;
size_t size;
} testcases[] = {
{kQueryTruncatedQuestion, base::size(kQueryTruncatedQuestion)},
{kQueryTwoQuestions, base::size(kQueryTwoQuestions)},
{kQueryInvalidDNSDomainName1, base::size(kQueryInvalidDNSDomainName1)},
{kQueryInvalidDNSDomainName2, base::size(kQueryInvalidDNSDomainName2)}};
std::unique_ptr<DnsQuery> query;
for (const auto& testcase : testcases) {
EXPECT_FALSE(ParseAndCreateDnsQueryFromRawPacket(testcase.data,
testcase.size, &query));
}
}
} // namespace
} // namespace net
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