455 lines
17 KiB
C++
455 lines
17 KiB
C++
// Copyright 2013 The Chromium Authors
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// Use of this source code is governed by a BSD-style license that can be
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// found in the LICENSE file.
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#include "net/dns/mdns_cache.h"
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#include <algorithm>
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#include <utility>
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#include "base/functional/bind.h"
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#include "base/time/time.h"
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#include "net/dns/dns_response.h"
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#include "net/dns/dns_test_util.h"
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#include "net/dns/record_parsed.h"
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#include "net/dns/record_rdata.h"
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#include "testing/gmock/include/gmock/gmock.h"
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#include "testing/gtest/include/gtest/gtest.h"
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using ::testing::Return;
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using ::testing::StrictMock;
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namespace net {
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static const uint8_t kTestResponsesDifferentAnswers[] = {
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// Answer 1
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// ghs.l.google.com in DNS format.
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3, 'g', 'h', 's', 1, 'l', 6, 'g', 'o', 'o', 'g', 'l', 'e', 3, 'c', 'o', 'm',
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0x00, 0x00, 0x01, // TYPE is A.
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0x00, 0x01, // CLASS is IN.
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0, 0, 0, 53, // TTL (4 bytes) is 53 seconds.
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0, 4, // RDLENGTH is 4 bytes.
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74, 125, 95, 121, // RDATA is the IP: 74.125.95.121
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// Answer 2
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// Pointer to answer 1
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0xc0, 0x00, 0x00, 0x01, // TYPE is A.
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0x00, 0x01, // CLASS is IN.
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0, 0, 0, 53, // TTL (4 bytes) is 53 seconds.
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0, 4, // RDLENGTH is 4 bytes.
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74, 125, 95, 122, // RDATA is the IP: 74.125.95.122
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};
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static const uint8_t kTestResponsesSameAnswers[] = {
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// Answer 1
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// ghs.l.google.com in DNS format.
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3, 'g', 'h', 's', 1, 'l', 6, 'g', 'o', 'o', 'g', 'l', 'e', 3, 'c', 'o', 'm',
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0x00, 0x00, 0x01, // TYPE is A.
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0x00, 0x01, // CLASS is IN.
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0, 0, 0, 53, // TTL (4 bytes) is 53 seconds.
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0, 4, // RDLENGTH is 4 bytes.
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74, 125, 95, 121, // RDATA is the IP: 74.125.95.121
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// Answer 2
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// Pointer to answer 1
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0xc0, 0x00, 0x00, 0x01, // TYPE is A.
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0x00, 0x01, // CLASS is IN.
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0, 0, 0, 112, // TTL (4 bytes) is 112 seconds.
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0, 4, // RDLENGTH is 4 bytes.
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74, 125, 95, 121, // RDATA is the IP: 74.125.95.121
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};
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static const uint8_t kTestResponseTwoRecords[] = {
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// Answer 1
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// ghs.l.google.com in DNS format. (A)
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3, 'g', 'h', 's', 1, 'l', 6, 'g', 'o', 'o', 'g', 'l', 'e', 3, 'c', 'o', 'm',
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0x00, 0x00, 0x01, // TYPE is A.
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0x00, 0x01, // CLASS is IN.
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0, 0, 0, 53, // TTL (4 bytes) is 53 seconds.
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0, 4, // RDLENGTH is 4 bytes.
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74, 125, 95, 121, // RDATA is the IP: 74.125.95.121
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// Answer 2
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// ghs.l.google.com in DNS format. (AAAA)
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3, 'g', 'h', 's', 1, 'l', 6, 'g', 'o', 'o', 'g', 'l', 'e', 3, 'c', 'o', 'm',
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0x00, 0x00, 0x1c, // TYPE is AAA.
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0x00, 0x01, // CLASS is IN.
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0, 0, 0, 53, // TTL (4 bytes) is 53 seconds.
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0, 16, // RDLENGTH is 16 bytes.
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0x4a, 0x7d, 0x4a, 0x7d, 0x5f, 0x79, 0x5f, 0x79, 0x5f, 0x79, 0x5f, 0x79,
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0x5f, 0x79, 0x5f, 0x79,
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};
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static const uint8_t kTestResponsesGoodbyePacket[] = {
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// Answer 1
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// ghs.l.google.com in DNS format. (Goodbye packet)
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3, 'g', 'h', 's', 1, 'l', 6, 'g', 'o', 'o', 'g', 'l', 'e', 3, 'c', 'o', 'm',
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0x00, 0x00, 0x01, // TYPE is A.
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0x00, 0x01, // CLASS is IN.
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0, 0, 0, 0, // TTL (4 bytes) is zero.
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0, 4, // RDLENGTH is 4 bytes.
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74, 125, 95, 121, // RDATA is the IP: 74.125.95.121
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// Answer 2
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// ghs.l.google.com in DNS format.
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3, 'g', 'h', 's', 1, 'l', 6, 'g', 'o', 'o', 'g', 'l', 'e', 3, 'c', 'o', 'm',
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0x00, 0x00, 0x01, // TYPE is A.
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0x00, 0x01, // CLASS is IN.
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0, 0, 0, 53, // TTL (4 bytes) is 53 seconds.
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0, 4, // RDLENGTH is 4 bytes.
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74, 125, 95, 121, // RDATA is the IP: 74.125.95.121
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};
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static const uint8_t kTestResponsesDifferentCapitalization[] = {
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// Answer 1
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// GHS.l.google.com in DNS format.
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3, 'G', 'H', 'S', 1, 'l', 6, 'g', 'o', 'o', 'g', 'l', 'e', 3, 'c', 'o', 'm',
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0x00, 0x00, 0x01, // TYPE is A.
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0x00, 0x01, // CLASS is IN.
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0, 0, 0, 53, // TTL (4 bytes) is 53 seconds.
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0, 4, // RDLENGTH is 4 bytes.
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74, 125, 95, 121, // RDATA is the IP: 74.125.95.121
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// Answer 2
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// ghs.l.GOOGLE.com in DNS format.
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3, 'g', 'h', 's', 1, 'l', 6, 'G', 'O', 'O', 'G', 'L', 'E', 3, 'c', 'o', 'm',
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0x00, 0x00, 0x01, // TYPE is A.
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0x00, 0x01, // CLASS is IN.
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0, 0, 0, 53, // TTL (4 bytes) is 53 seconds.
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0, 4, // RDLENGTH is 4 bytes.
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74, 125, 95, 122, // RDATA is the IP: 74.125.95.122
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};
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class RecordRemovalMock {
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public:
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MOCK_METHOD1(OnRecordRemoved, void(const RecordParsed*));
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};
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class MDnsCacheTest : public ::testing::Test {
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public:
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MDnsCacheTest()
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: default_time_(base::Time::FromDoubleT(1234.0)) {}
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~MDnsCacheTest() override = default;
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protected:
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base::Time default_time_;
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StrictMock<RecordRemovalMock> record_removal_;
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MDnsCache cache_;
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};
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// Test a single insert, corresponding lookup, and unsuccessful lookup.
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TEST_F(MDnsCacheTest, InsertLookupSingle) {
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DnsRecordParser parser(kT1ResponseDatagram, sizeof(kT1ResponseDatagram),
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sizeof(dns_protocol::Header), kT1RecordCount);
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std::string dotted_qname;
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uint16_t qtype;
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parser.ReadQuestion(dotted_qname, qtype);
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std::unique_ptr<const RecordParsed> record1;
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std::unique_ptr<const RecordParsed> record2;
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std::vector<const RecordParsed*> results;
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record1 = RecordParsed::CreateFrom(&parser, default_time_);
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record2 = RecordParsed::CreateFrom(&parser, default_time_);
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EXPECT_EQ(MDnsCache::RecordAdded, cache_.UpdateDnsRecord(std::move(record1)));
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EXPECT_EQ(MDnsCache::RecordAdded, cache_.UpdateDnsRecord(std::move(record2)));
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cache_.FindDnsRecords(ARecordRdata::kType, "ghs.l.google.com", &results,
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default_time_);
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EXPECT_EQ(1u, results.size());
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EXPECT_EQ(default_time_, results.front()->time_created());
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EXPECT_EQ("ghs.l.google.com", results.front()->name());
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results.clear();
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cache_.FindDnsRecords(PtrRecordRdata::kType, "ghs.l.google.com", &results,
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default_time_);
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EXPECT_EQ(0u, results.size());
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}
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// Test that records expire when their ttl has passed.
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TEST_F(MDnsCacheTest, Expiration) {
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DnsRecordParser parser(kT1ResponseDatagram, sizeof(kT1ResponseDatagram),
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sizeof(dns_protocol::Header), kT1RecordCount);
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std::string dotted_qname;
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uint16_t qtype;
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parser.ReadQuestion(dotted_qname, qtype);
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std::unique_ptr<const RecordParsed> record1;
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std::unique_ptr<const RecordParsed> record2;
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std::vector<const RecordParsed*> results;
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const RecordParsed* record_to_be_deleted;
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record1 = RecordParsed::CreateFrom(&parser, default_time_);
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base::TimeDelta ttl1 = base::Seconds(record1->ttl());
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record2 = RecordParsed::CreateFrom(&parser, default_time_);
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base::TimeDelta ttl2 = base::Seconds(record2->ttl());
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record_to_be_deleted = record2.get();
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EXPECT_EQ(MDnsCache::RecordAdded, cache_.UpdateDnsRecord(std::move(record1)));
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EXPECT_EQ(MDnsCache::RecordAdded, cache_.UpdateDnsRecord(std::move(record2)));
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cache_.FindDnsRecords(ARecordRdata::kType, "ghs.l.google.com", &results,
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default_time_);
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EXPECT_EQ(1u, results.size());
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EXPECT_EQ(default_time_ + ttl2, cache_.next_expiration());
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cache_.FindDnsRecords(ARecordRdata::kType, "ghs.l.google.com", &results,
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default_time_ + ttl2);
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EXPECT_EQ(0u, results.size());
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EXPECT_CALL(record_removal_, OnRecordRemoved(record_to_be_deleted));
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cache_.CleanupRecords(
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default_time_ + ttl2,
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base::BindRepeating(&RecordRemovalMock::OnRecordRemoved,
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base::Unretained(&record_removal_)));
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// To make sure that we've indeed removed them from the map, check no funny
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// business happens once they're deleted for good.
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EXPECT_EQ(default_time_ + ttl1, cache_.next_expiration());
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cache_.FindDnsRecords(ARecordRdata::kType, "ghs.l.google.com", &results,
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default_time_ + ttl2);
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EXPECT_EQ(0u, results.size());
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}
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// Test that a new record replacing one with the same identity (name/rrtype for
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// unique records) causes the cache to output a "record changed" event.
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TEST_F(MDnsCacheTest, RecordChange) {
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DnsRecordParser parser(kTestResponsesDifferentAnswers,
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sizeof(kTestResponsesDifferentAnswers), 0,
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/*num_records=*/2);
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std::unique_ptr<const RecordParsed> record1;
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std::unique_ptr<const RecordParsed> record2;
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std::vector<const RecordParsed*> results;
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record1 = RecordParsed::CreateFrom(&parser, default_time_);
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record2 = RecordParsed::CreateFrom(&parser, default_time_);
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EXPECT_EQ(MDnsCache::RecordAdded, cache_.UpdateDnsRecord(std::move(record1)));
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EXPECT_EQ(MDnsCache::RecordChanged,
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cache_.UpdateDnsRecord(std::move(record2)));
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}
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// Test that a new record replacing an otherwise identical one already in the
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// cache causes the cache to output a "no change" event.
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TEST_F(MDnsCacheTest, RecordNoChange) {
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DnsRecordParser parser(kTestResponsesSameAnswers,
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sizeof(kTestResponsesSameAnswers), 0,
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/*num_records=*/2);
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std::unique_ptr<const RecordParsed> record1;
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std::unique_ptr<const RecordParsed> record2;
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std::vector<const RecordParsed*> results;
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record1 = RecordParsed::CreateFrom(&parser, default_time_);
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record2 = RecordParsed::CreateFrom(&parser, default_time_ + base::Seconds(1));
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EXPECT_EQ(MDnsCache::RecordAdded, cache_.UpdateDnsRecord(std::move(record1)));
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EXPECT_EQ(MDnsCache::NoChange, cache_.UpdateDnsRecord(std::move(record2)));
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}
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// Test that the next expiration time of the cache is updated properly on record
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// insertion.
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TEST_F(MDnsCacheTest, RecordPreemptExpirationTime) {
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DnsRecordParser parser(kTestResponsesSameAnswers,
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sizeof(kTestResponsesSameAnswers), 0,
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/*num_records=*/2);
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std::unique_ptr<const RecordParsed> record1;
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std::unique_ptr<const RecordParsed> record2;
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std::vector<const RecordParsed*> results;
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record1 = RecordParsed::CreateFrom(&parser, default_time_);
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record2 = RecordParsed::CreateFrom(&parser, default_time_);
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base::TimeDelta ttl1 = base::Seconds(record1->ttl());
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base::TimeDelta ttl2 = base::Seconds(record2->ttl());
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EXPECT_EQ(base::Time(), cache_.next_expiration());
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EXPECT_EQ(MDnsCache::RecordAdded, cache_.UpdateDnsRecord(std::move(record2)));
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EXPECT_EQ(default_time_ + ttl2, cache_.next_expiration());
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EXPECT_EQ(MDnsCache::NoChange, cache_.UpdateDnsRecord(std::move(record1)));
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EXPECT_EQ(default_time_ + ttl1, cache_.next_expiration());
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}
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// Test that the cache handles mDNS "goodbye" packets correctly, not adding the
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// records to the cache if they are not already there, and eventually removing
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// records from the cache if they are.
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TEST_F(MDnsCacheTest, GoodbyePacket) {
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DnsRecordParser parser(kTestResponsesGoodbyePacket,
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sizeof(kTestResponsesGoodbyePacket), 0,
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/*num_records=*/2);
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std::unique_ptr<const RecordParsed> record_goodbye;
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std::unique_ptr<const RecordParsed> record_hello;
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std::unique_ptr<const RecordParsed> record_goodbye2;
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std::vector<const RecordParsed*> results;
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record_goodbye = RecordParsed::CreateFrom(&parser, default_time_);
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record_hello = RecordParsed::CreateFrom(&parser, default_time_);
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parser = DnsRecordParser(kTestResponsesGoodbyePacket,
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sizeof(kTestResponsesGoodbyePacket), 0,
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/*num_records=*/2);
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record_goodbye2 = RecordParsed::CreateFrom(&parser, default_time_);
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base::TimeDelta ttl = base::Seconds(record_hello->ttl());
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EXPECT_EQ(base::Time(), cache_.next_expiration());
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EXPECT_EQ(MDnsCache::NoChange,
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cache_.UpdateDnsRecord(std::move(record_goodbye)));
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EXPECT_EQ(base::Time(), cache_.next_expiration());
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EXPECT_EQ(MDnsCache::RecordAdded,
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cache_.UpdateDnsRecord(std::move(record_hello)));
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EXPECT_EQ(default_time_ + ttl, cache_.next_expiration());
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EXPECT_EQ(MDnsCache::NoChange,
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cache_.UpdateDnsRecord(std::move(record_goodbye2)));
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EXPECT_EQ(default_time_ + base::Seconds(1), cache_.next_expiration());
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}
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TEST_F(MDnsCacheTest, AnyRRType) {
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DnsRecordParser parser(kTestResponseTwoRecords,
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sizeof(kTestResponseTwoRecords), 0, /*num_records=*/2);
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std::unique_ptr<const RecordParsed> record1;
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std::unique_ptr<const RecordParsed> record2;
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std::vector<const RecordParsed*> results;
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record1 = RecordParsed::CreateFrom(&parser, default_time_);
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record2 = RecordParsed::CreateFrom(&parser, default_time_);
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EXPECT_EQ(MDnsCache::RecordAdded, cache_.UpdateDnsRecord(std::move(record1)));
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EXPECT_EQ(MDnsCache::RecordAdded, cache_.UpdateDnsRecord(std::move(record2)));
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cache_.FindDnsRecords(0, "ghs.l.google.com", &results, default_time_);
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EXPECT_EQ(2u, results.size());
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EXPECT_EQ(default_time_, results.front()->time_created());
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EXPECT_EQ("ghs.l.google.com", results[0]->name());
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EXPECT_EQ("ghs.l.google.com", results[1]->name());
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EXPECT_EQ(dns_protocol::kTypeA,
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std::min(results[0]->type(), results[1]->type()));
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EXPECT_EQ(dns_protocol::kTypeAAAA,
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std::max(results[0]->type(), results[1]->type()));
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}
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TEST_F(MDnsCacheTest, RemoveRecord) {
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DnsRecordParser parser(kT1ResponseDatagram, sizeof(kT1ResponseDatagram),
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sizeof(dns_protocol::Header), kT1RecordCount);
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std::string dotted_qname;
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uint16_t qtype;
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parser.ReadQuestion(dotted_qname, qtype);
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std::unique_ptr<const RecordParsed> record1;
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std::vector<const RecordParsed*> results;
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record1 = RecordParsed::CreateFrom(&parser, default_time_);
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EXPECT_EQ(MDnsCache::RecordAdded, cache_.UpdateDnsRecord(std::move(record1)));
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cache_.FindDnsRecords(dns_protocol::kTypeCNAME, "codereview.chromium.org",
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&results, default_time_);
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EXPECT_EQ(1u, results.size());
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std::unique_ptr<const RecordParsed> record_out =
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cache_.RemoveRecord(results.front());
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EXPECT_EQ(record_out.get(), results.front());
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cache_.FindDnsRecords(dns_protocol::kTypeCNAME, "codereview.chromium.org",
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&results, default_time_);
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EXPECT_EQ(0u, results.size());
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}
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TEST_F(MDnsCacheTest, IsCacheOverfilled) {
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DnsRecordParser parser(kTestResponseTwoRecords,
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sizeof(kTestResponseTwoRecords), 0, /*num_records=*/2);
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std::unique_ptr<const RecordParsed> record1 =
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RecordParsed::CreateFrom(&parser, default_time_);
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const RecordParsed* record1_ptr = record1.get();
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std::unique_ptr<const RecordParsed> record2 =
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RecordParsed::CreateFrom(&parser, default_time_);
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cache_.set_entry_limit_for_testing(1);
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EXPECT_EQ(MDnsCache::RecordAdded, cache_.UpdateDnsRecord(std::move(record1)));
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EXPECT_FALSE(cache_.IsCacheOverfilled());
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EXPECT_EQ(MDnsCache::RecordAdded, cache_.UpdateDnsRecord(std::move(record2)));
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EXPECT_TRUE(cache_.IsCacheOverfilled());
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record1 = cache_.RemoveRecord(record1_ptr);
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EXPECT_TRUE(record1);
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EXPECT_FALSE(cache_.IsCacheOverfilled());
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}
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TEST_F(MDnsCacheTest, ClearOnOverfilledCleanup) {
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DnsRecordParser parser(kTestResponseTwoRecords,
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sizeof(kTestResponseTwoRecords), 0, /*num_records=*/2);
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std::unique_ptr<const RecordParsed> record1 =
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RecordParsed::CreateFrom(&parser, default_time_);
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const RecordParsed* record1_ptr = record1.get();
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std::unique_ptr<const RecordParsed> record2 =
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RecordParsed::CreateFrom(&parser, default_time_);
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const RecordParsed* record2_ptr = record2.get();
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cache_.set_entry_limit_for_testing(1);
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EXPECT_EQ(MDnsCache::RecordAdded, cache_.UpdateDnsRecord(std::move(record1)));
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EXPECT_EQ(MDnsCache::RecordAdded, cache_.UpdateDnsRecord(std::move(record2)));
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ASSERT_TRUE(cache_.IsCacheOverfilled());
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// Expect everything to be removed on CleanupRecords() with overfilled cache.
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EXPECT_CALL(record_removal_, OnRecordRemoved(record1_ptr));
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EXPECT_CALL(record_removal_, OnRecordRemoved(record2_ptr));
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cache_.CleanupRecords(
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default_time_, base::BindRepeating(&RecordRemovalMock::OnRecordRemoved,
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base::Unretained(&record_removal_)));
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|
EXPECT_FALSE(cache_.IsCacheOverfilled());
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|
std::vector<const RecordParsed*> results;
|
|
cache_.FindDnsRecords(dns_protocol::kTypeA, "ghs.l.google.com", &results,
|
|
default_time_);
|
|
EXPECT_TRUE(results.empty());
|
|
cache_.FindDnsRecords(dns_protocol::kTypeAAAA, "ghs.l.google.com", &results,
|
|
default_time_);
|
|
EXPECT_TRUE(results.empty());
|
|
}
|
|
|
|
TEST_F(MDnsCacheTest, CaseInsensitive) {
|
|
DnsRecordParser parser(kTestResponsesDifferentCapitalization,
|
|
sizeof(kTestResponsesDifferentCapitalization), 0,
|
|
/*num_records=*/2);
|
|
|
|
std::unique_ptr<const RecordParsed> record1;
|
|
std::unique_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)));
|
|
|
|
cache_.FindDnsRecords(0, "ghs.l.google.com", &results, default_time_);
|
|
|
|
EXPECT_EQ(1u, results.size());
|
|
EXPECT_EQ("ghs.l.GOOGLE.com", results[0]->name());
|
|
|
|
std::vector<const RecordParsed*> results2;
|
|
cache_.FindDnsRecords(0, "GHS.L.google.COM", &results2, default_time_);
|
|
EXPECT_EQ(results, results2);
|
|
}
|
|
|
|
} // namespace net
|