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// Copyright (c) 2013 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/mdns_cache.h"
#include <algorithm>
#include <utility>
#include "base/bind.h"
#include "net/dns/dns_response.h"
#include "net/dns/dns_test_util.h"
#include "net/dns/record_parsed.h"
#include "net/dns/record_rdata.h"
#include "testing/gmock/include/gmock/gmock.h"
#include "testing/gtest/include/gtest/gtest.h"
using ::testing::Return;
using ::testing::StrictMock;
namespace net {
static const uint8_t kTestResponsesDifferentAnswers[] = {
// Answer 1
// ghs.l.google.com in DNS format.
3, 'g', 'h', 's', 1, 'l', 6, 'g', 'o', 'o', 'g', 'l', 'e', 3, 'c', 'o', 'm',
0x00, 0x00, 0x01, // TYPE is A.
0x00, 0x01, // CLASS is IN.
0, 0, 0, 53, // TTL (4 bytes) is 53 seconds.
0, 4, // RDLENGTH is 4 bytes.
74, 125, 95, 121, // RDATA is the IP: 74.125.95.121
// Answer 2
// Pointer to answer 1
0xc0, 0x00, 0x00, 0x01, // TYPE is A.
0x00, 0x01, // CLASS is IN.
0, 0, 0, 53, // TTL (4 bytes) is 53 seconds.
0, 4, // RDLENGTH is 4 bytes.
74, 125, 95, 122, // RDATA is the IP: 74.125.95.122
};
static const uint8_t kTestResponsesSameAnswers[] = {
// Answer 1
// ghs.l.google.com in DNS format.
3, 'g', 'h', 's', 1, 'l', 6, 'g', 'o', 'o', 'g', 'l', 'e', 3, 'c', 'o', 'm',
0x00, 0x00, 0x01, // TYPE is A.
0x00, 0x01, // CLASS is IN.
0, 0, 0, 53, // TTL (4 bytes) is 53 seconds.
0, 4, // RDLENGTH is 4 bytes.
74, 125, 95, 121, // RDATA is the IP: 74.125.95.121
// Answer 2
// Pointer to answer 1
0xc0, 0x00, 0x00, 0x01, // TYPE is A.
0x00, 0x01, // CLASS is IN.
0, 0, 0, 112, // TTL (4 bytes) is 112 seconds.
0, 4, // RDLENGTH is 4 bytes.
74, 125, 95, 121, // RDATA is the IP: 74.125.95.121
};
static const uint8_t kTestResponseTwoRecords[] = {
// Answer 1
// ghs.l.google.com in DNS format. (A)
3, 'g', 'h', 's', 1, 'l', 6, 'g', 'o', 'o', 'g', 'l', 'e', 3, 'c', 'o', 'm',
0x00, 0x00, 0x01, // TYPE is A.
0x00, 0x01, // CLASS is IN.
0, 0, 0, 53, // TTL (4 bytes) is 53 seconds.
0, 4, // RDLENGTH is 4 bytes.
74, 125, 95, 121, // RDATA is the IP: 74.125.95.121
// Answer 2
// ghs.l.google.com in DNS format. (AAAA)
3, 'g', 'h', 's', 1, 'l', 6, 'g', 'o', 'o', 'g', 'l', 'e', 3, 'c', 'o', 'm',
0x00, 0x00, 0x1c, // TYPE is AAA.
0x00, 0x01, // CLASS is IN.
0, 0, 0, 53, // TTL (4 bytes) is 53 seconds.
0, 16, // RDLENGTH is 16 bytes.
0x4a, 0x7d, 0x4a, 0x7d, 0x5f, 0x79, 0x5f, 0x79, 0x5f, 0x79, 0x5f, 0x79,
0x5f, 0x79, 0x5f, 0x79,
};
static const uint8_t kTestResponsesGoodbyePacket[] = {
// Answer 1
// ghs.l.google.com in DNS format. (Goodbye packet)
3, 'g', 'h', 's', 1, 'l', 6, 'g', 'o', 'o', 'g', 'l', 'e', 3, 'c', 'o', 'm',
0x00, 0x00, 0x01, // TYPE is A.
0x00, 0x01, // CLASS is IN.
0, 0, 0, 0, // TTL (4 bytes) is zero.
0, 4, // RDLENGTH is 4 bytes.
74, 125, 95, 121, // RDATA is the IP: 74.125.95.121
// Answer 2
// ghs.l.google.com in DNS format.
3, 'g', 'h', 's', 1, 'l', 6, 'g', 'o', 'o', 'g', 'l', 'e', 3, 'c', 'o', 'm',
0x00, 0x00, 0x01, // TYPE is A.
0x00, 0x01, // CLASS is IN.
0, 0, 0, 53, // TTL (4 bytes) is 53 seconds.
0, 4, // RDLENGTH is 4 bytes.
74, 125, 95, 121, // RDATA is the IP: 74.125.95.121
};
class RecordRemovalMock {
public:
MOCK_METHOD1(OnRecordRemoved, void(const RecordParsed*));
};
class MDnsCacheTest : public ::testing::Test {
public:
MDnsCacheTest()
: default_time_(base::Time::FromDoubleT(1234.0)) {}
virtual ~MDnsCacheTest() {}
protected:
base::Time default_time_;
StrictMock<RecordRemovalMock> record_removal_;
MDnsCache cache_;
};
// Test a single insert, corresponding lookup, and unsuccessful lookup.
TEST_F(MDnsCacheTest, InsertLookupSingle) {
DnsRecordParser parser(kT1ResponseDatagram, sizeof(kT1ResponseDatagram),
sizeof(dns_protocol::Header));
parser.SkipQuestion();
scoped_ptr<const RecordParsed> record1;
scoped_ptr<const RecordParsed> record2;
std::vector<const RecordParsed*> results;
record1 = RecordParsed::CreateFrom(&parser, default_time_);
record2 = RecordParsed::CreateFrom(&parser, default_time_);
EXPECT_EQ(MDnsCache::RecordAdded, cache_.UpdateDnsRecord(std::move(record1)));
EXPECT_EQ(MDnsCache::RecordAdded, cache_.UpdateDnsRecord(std::move(record2)));
cache_.FindDnsRecords(ARecordRdata::kType, "ghs.l.google.com", &results,
default_time_);
EXPECT_EQ(1u, results.size());
EXPECT_EQ(default_time_, results.front()->time_created());
EXPECT_EQ("ghs.l.google.com", results.front()->name());
results.clear();
cache_.FindDnsRecords(PtrRecordRdata::kType, "ghs.l.google.com", &results,
default_time_);
EXPECT_EQ(0u, results.size());
}
// Test that records expire when their ttl has passed.
TEST_F(MDnsCacheTest, Expiration) {
DnsRecordParser parser(kT1ResponseDatagram, sizeof(kT1ResponseDatagram),
sizeof(dns_protocol::Header));
parser.SkipQuestion();
scoped_ptr<const RecordParsed> record1;
scoped_ptr<const RecordParsed> record2;
std::vector<const RecordParsed*> results;
const RecordParsed* record_to_be_deleted;
record1 = RecordParsed::CreateFrom(&parser, default_time_);
base::TimeDelta ttl1 = base::TimeDelta::FromSeconds(record1->ttl());
record2 = RecordParsed::CreateFrom(&parser, default_time_);
base::TimeDelta ttl2 = base::TimeDelta::FromSeconds(record2->ttl());
record_to_be_deleted = record2.get();
EXPECT_EQ(MDnsCache::RecordAdded, cache_.UpdateDnsRecord(std::move(record1)));
EXPECT_EQ(MDnsCache::RecordAdded, cache_.UpdateDnsRecord(std::move(record2)));
cache_.FindDnsRecords(ARecordRdata::kType, "ghs.l.google.com", &results,
default_time_);
EXPECT_EQ(1u, results.size());
EXPECT_EQ(default_time_ + ttl2, cache_.next_expiration());
cache_.FindDnsRecords(ARecordRdata::kType, "ghs.l.google.com", &results,
default_time_ + ttl2);
EXPECT_EQ(0u, results.size());
EXPECT_CALL(record_removal_, OnRecordRemoved(record_to_be_deleted));
cache_.CleanupRecords(default_time_ + ttl2, base::Bind(
&RecordRemovalMock::OnRecordRemoved, base::Unretained(&record_removal_)));
// To make sure that we've indeed removed them from the map, check no funny
// business happens once they're deleted for good.
EXPECT_EQ(default_time_ + ttl1, cache_.next_expiration());
cache_.FindDnsRecords(ARecordRdata::kType, "ghs.l.google.com", &results,
default_time_ + ttl2);
EXPECT_EQ(0u, results.size());
}
// Test that a new record replacing one with the same identity (name/rrtype for
// unique records) causes the cache to output a "record changed" event.
TEST_F(MDnsCacheTest, RecordChange) {
DnsRecordParser parser(kTestResponsesDifferentAnswers,
sizeof(kTestResponsesDifferentAnswers),
0);
scoped_ptr<const RecordParsed> record1;
scoped_ptr<const RecordParsed> record2;
std::vector<const RecordParsed*> results;
record1 = RecordParsed::CreateFrom(&parser, default_time_);
record2 = RecordParsed::CreateFrom(&parser, default_time_);
EXPECT_EQ(MDnsCache::RecordAdded, cache_.UpdateDnsRecord(std::move(record1)));
EXPECT_EQ(MDnsCache::RecordChanged,
cache_.UpdateDnsRecord(std::move(record2)));
}
// Test that a new record replacing an otherwise identical one already in the
// cache causes the cache to output a "no change" event.
TEST_F(MDnsCacheTest, RecordNoChange) {
DnsRecordParser parser(kTestResponsesSameAnswers,
sizeof(kTestResponsesSameAnswers),
0);
scoped_ptr<const RecordParsed> record1;
scoped_ptr<const RecordParsed> record2;
std::vector<const RecordParsed*> results;
record1 = RecordParsed::CreateFrom(&parser, default_time_);
record2 = RecordParsed::CreateFrom(&parser, default_time_ +
base::TimeDelta::FromSeconds(1));
EXPECT_EQ(MDnsCache::RecordAdded, cache_.UpdateDnsRecord(std::move(record1)));
EXPECT_EQ(MDnsCache::NoChange, cache_.UpdateDnsRecord(std::move(record2)));
}
// Test that the next expiration time of the cache is updated properly on record
// insertion.
TEST_F(MDnsCacheTest, RecordPreemptExpirationTime) {
DnsRecordParser parser(kTestResponsesSameAnswers,
sizeof(kTestResponsesSameAnswers),
0);
scoped_ptr<const RecordParsed> record1;
scoped_ptr<const RecordParsed> record2;
std::vector<const RecordParsed*> results;
record1 = RecordParsed::CreateFrom(&parser, default_time_);
record2 = RecordParsed::CreateFrom(&parser, default_time_);
base::TimeDelta ttl1 = base::TimeDelta::FromSeconds(record1->ttl());
base::TimeDelta ttl2 = base::TimeDelta::FromSeconds(record2->ttl());
EXPECT_EQ(base::Time(), cache_.next_expiration());
EXPECT_EQ(MDnsCache::RecordAdded, cache_.UpdateDnsRecord(std::move(record2)));
EXPECT_EQ(default_time_ + ttl2, cache_.next_expiration());
EXPECT_EQ(MDnsCache::NoChange, cache_.UpdateDnsRecord(std::move(record1)));
EXPECT_EQ(default_time_ + ttl1, cache_.next_expiration());
}
// Test that the cache handles mDNS "goodbye" packets correctly, not adding the
// records to the cache if they are not already there, and eventually removing
// records from the cache if they are.
TEST_F(MDnsCacheTest, GoodbyePacket) {
DnsRecordParser parser(kTestResponsesGoodbyePacket,
sizeof(kTestResponsesGoodbyePacket),
0);
scoped_ptr<const RecordParsed> record_goodbye;
scoped_ptr<const RecordParsed> record_hello;
scoped_ptr<const RecordParsed> record_goodbye2;
std::vector<const RecordParsed*> results;
record_goodbye = RecordParsed::CreateFrom(&parser, default_time_);
record_hello = RecordParsed::CreateFrom(&parser, default_time_);
parser = DnsRecordParser(kTestResponsesGoodbyePacket,
sizeof(kTestResponsesGoodbyePacket),
0);
record_goodbye2 = RecordParsed::CreateFrom(&parser, default_time_);
base::TimeDelta ttl = base::TimeDelta::FromSeconds(record_hello->ttl());
EXPECT_EQ(base::Time(), cache_.next_expiration());
EXPECT_EQ(MDnsCache::NoChange,
cache_.UpdateDnsRecord(std::move(record_goodbye)));
EXPECT_EQ(base::Time(), cache_.next_expiration());
EXPECT_EQ(MDnsCache::RecordAdded,
cache_.UpdateDnsRecord(std::move(record_hello)));
EXPECT_EQ(default_time_ + ttl, cache_.next_expiration());
EXPECT_EQ(MDnsCache::NoChange,
cache_.UpdateDnsRecord(std::move(record_goodbye2)));
EXPECT_EQ(default_time_ + base::TimeDelta::FromSeconds(1),
cache_.next_expiration());
}
TEST_F(MDnsCacheTest, AnyRRType) {
DnsRecordParser parser(kTestResponseTwoRecords,
sizeof(kTestResponseTwoRecords),
0);
scoped_ptr<const RecordParsed> record1;
scoped_ptr<const RecordParsed> record2;
std::vector<const RecordParsed*> results;
record1 = RecordParsed::CreateFrom(&parser, default_time_);
record2 = RecordParsed::CreateFrom(&parser, default_time_);
EXPECT_EQ(MDnsCache::RecordAdded, cache_.UpdateDnsRecord(std::move(record1)));
EXPECT_EQ(MDnsCache::RecordAdded, cache_.UpdateDnsRecord(std::move(record2)));
cache_.FindDnsRecords(0, "ghs.l.google.com", &results, default_time_);
EXPECT_EQ(2u, results.size());
EXPECT_EQ(default_time_, results.front()->time_created());
EXPECT_EQ("ghs.l.google.com", results[0]->name());
EXPECT_EQ("ghs.l.google.com", results[1]->name());
EXPECT_EQ(dns_protocol::kTypeA,
std::min(results[0]->type(), results[1]->type()));
EXPECT_EQ(dns_protocol::kTypeAAAA,
std::max(results[0]->type(), results[1]->type()));
}
TEST_F(MDnsCacheTest, RemoveRecord) {
DnsRecordParser parser(kT1ResponseDatagram, sizeof(kT1ResponseDatagram),
sizeof(dns_protocol::Header));
parser.SkipQuestion();
scoped_ptr<const RecordParsed> record1;
std::vector<const RecordParsed*> results;
record1 = RecordParsed::CreateFrom(&parser, default_time_);
EXPECT_EQ(MDnsCache::RecordAdded, cache_.UpdateDnsRecord(std::move(record1)));
cache_.FindDnsRecords(dns_protocol::kTypeCNAME, "codereview.chromium.org",
&results, default_time_);
EXPECT_EQ(1u, results.size());
scoped_ptr<const RecordParsed> record_out =
cache_.RemoveRecord(results.front());
EXPECT_EQ(record_out.get(), results.front());
cache_.FindDnsRecords(dns_protocol::kTypeCNAME, "codereview.chromium.org",
&results, default_time_);
EXPECT_EQ(0u, results.size());
}
} // namespace net
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