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// Copyright 2020 The Chromium Authors
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#include "net/dns/dns_udp_tracker.h"
#include "base/test/simple_test_tick_clock.h"
#include "net/base/net_errors.h"
#include "testing/gtest/include/gtest/gtest.h"
namespace net {
namespace {
class DnsUdpTrackerTest : public testing::Test {
public:
DnsUdpTrackerTest() {
tracker_.set_tick_clock_for_testing(&test_tick_clock_);
}
protected:
DnsUdpTracker tracker_;
base::SimpleTestTickClock test_tick_clock_;
};
TEST_F(DnsUdpTrackerTest, MatchingId) {
uint16_t port = 416;
uint16_t id = 56;
for (size_t i = 0; i < DnsUdpTracker::kRecognizedIdMismatchThreshold; ++i) {
tracker_.RecordQuery(++port, ++id);
tracker_.RecordResponseId(id /* query_id */, id /* response_id */);
EXPECT_FALSE(tracker_.low_entropy());
}
}
TEST_F(DnsUdpTrackerTest, ReusedMismatches) {
static const uint16_t kOldId = 786;
tracker_.RecordQuery(123 /* port */, kOldId);
uint16_t port = 3889;
uint16_t id = 3456;
for (size_t i = 0; i < DnsUdpTracker::kRecognizedIdMismatchThreshold; ++i) {
EXPECT_FALSE(tracker_.low_entropy());
tracker_.RecordQuery(++port, ++id);
tracker_.RecordResponseId(id /* query_id */, kOldId /* response_id */);
}
EXPECT_TRUE(tracker_.low_entropy());
}
TEST_F(DnsUdpTrackerTest, ReusedMismatches_Expired) {
static const uint16_t kOldId = 786;
tracker_.RecordQuery(123 /* port */, kOldId);
test_tick_clock_.Advance(DnsUdpTracker::kMaxAge + base::Milliseconds(1));
uint16_t port = 3889;
uint16_t id = 3456;
// Because the query record has expired, the ID should be treated as
// unrecognized.
for (size_t i = 0; i < DnsUdpTracker::kUnrecognizedIdMismatchThreshold; ++i) {
EXPECT_FALSE(tracker_.low_entropy());
tracker_.RecordQuery(++port, ++id);
tracker_.RecordResponseId(id /* query_id */, kOldId /* response_id */);
}
EXPECT_TRUE(tracker_.low_entropy());
}
// Test for ID mismatches using an ID still kept in recorded queries, but not
// recent enough to be considered reognized.
TEST_F(DnsUdpTrackerTest, ReusedMismatches_Old) {
static const uint16_t kOldId = 786;
tracker_.RecordQuery(123 /* port */, kOldId);
test_tick_clock_.Advance(DnsUdpTracker::kMaxRecognizedIdAge +
base::Milliseconds(1));
uint16_t port = 3889;
uint16_t id = 3456;
// Expect the ID to be treated as unrecognized.
for (size_t i = 0; i < DnsUdpTracker::kUnrecognizedIdMismatchThreshold; ++i) {
EXPECT_FALSE(tracker_.low_entropy());
tracker_.RecordQuery(++port, ++id);
tracker_.RecordResponseId(id /* query_id */, kOldId /* response_id */);
}
EXPECT_TRUE(tracker_.low_entropy());
}
TEST_F(DnsUdpTrackerTest, ReusedMismatches_Full) {
static const uint16_t kOldId = 786;
tracker_.RecordQuery(123 /* port */, kOldId);
uint16_t port = 124;
uint16_t id = 3457;
for (size_t i = 0; i < DnsUdpTracker::kMaxRecordedQueries; ++i) {
tracker_.RecordQuery(++port, ++id);
}
// Expect the ID to be treated as unrecognized.
for (size_t i = 0; i < DnsUdpTracker::kUnrecognizedIdMismatchThreshold; ++i) {
EXPECT_FALSE(tracker_.low_entropy());
tracker_.RecordResponseId(id /* query_id */, kOldId /* response_id */);
}
EXPECT_TRUE(tracker_.low_entropy());
}
TEST_F(DnsUdpTrackerTest, UnknownMismatches) {
uint16_t port = 10014;
uint16_t id = 4332;
for (size_t i = 0; i < DnsUdpTracker::kUnrecognizedIdMismatchThreshold; ++i) {
EXPECT_FALSE(tracker_.low_entropy());
tracker_.RecordQuery(++port, ++id);
tracker_.RecordResponseId(id /* query_id */, 743 /* response_id */);
}
EXPECT_TRUE(tracker_.low_entropy());
}
TEST_F(DnsUdpTrackerTest, ReusedPort) {
static const uint16_t kPort = 2135;
tracker_.RecordQuery(kPort, 579 /* query_id */);
uint16_t id = 580;
for (int i = 0; i < DnsUdpTracker::kPortReuseThreshold; ++i) {
EXPECT_FALSE(tracker_.low_entropy());
tracker_.RecordQuery(kPort, ++id);
tracker_.RecordResponseId(id /* query_id */, id /* response_id */);
}
EXPECT_TRUE(tracker_.low_entropy());
}
TEST_F(DnsUdpTrackerTest, ReusedPort_Expired) {
static const uint16_t kPort = 2135;
tracker_.RecordQuery(kPort, 579 /* query_id */);
test_tick_clock_.Advance(DnsUdpTracker::kMaxAge + base::Milliseconds(1));
EXPECT_FALSE(tracker_.low_entropy());
uint16_t id = 580;
for (int i = 0; i < DnsUdpTracker::kPortReuseThreshold; ++i) {
tracker_.RecordQuery(kPort, ++id);
tracker_.RecordResponseId(id /* query_id */, id /* response_id */);
EXPECT_FALSE(tracker_.low_entropy());
}
}
TEST_F(DnsUdpTrackerTest, ReusedPort_Full) {
static const uint16_t kPort = 2135;
tracker_.RecordQuery(kPort, 579 /* query_id */);
uint16_t port = 124;
uint16_t id = 3457;
for (size_t i = 0; i < DnsUdpTracker::kMaxRecordedQueries; ++i) {
tracker_.RecordQuery(++port, ++id);
}
EXPECT_FALSE(tracker_.low_entropy());
for (int i = 0; i < DnsUdpTracker::kPortReuseThreshold; ++i) {
tracker_.RecordQuery(kPort, ++id);
tracker_.RecordResponseId(id /* query_id */, id /* response_id */);
EXPECT_FALSE(tracker_.low_entropy());
}
}
TEST_F(DnsUdpTrackerTest, ConnectionError) {
tracker_.RecordConnectionError(ERR_FAILED);
EXPECT_FALSE(tracker_.low_entropy());
}
TEST_F(DnsUdpTrackerTest, ConnectionError_InsufficientResources) {
tracker_.RecordConnectionError(ERR_INSUFFICIENT_RESOURCES);
EXPECT_TRUE(tracker_.low_entropy());
}
} // namespace
} // namespace net
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