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// Copyright 2021 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_config_service_linux.h"
#include <arpa/inet.h>
#include <resolv.h>
#include <memory>
#include <utility>
#include <vector>
#include "base/cancelable_callback.h"
#include "base/check.h"
#include "base/files/file_util.h"
#include "base/functional/bind.h"
#include "base/memory/raw_ptr.h"
#include "base/memory/scoped_refptr.h"
#include "base/run_loop.h"
#include "base/sys_byteorder.h"
#include "base/task/sequenced_task_runner.h"
#include "base/task/single_thread_task_runner.h"
#include "base/task/task_traits.h"
#include "base/task/thread_pool.h"
#include "base/test/metrics/histogram_tester.h"
#include "base/test/task_environment.h"
#include "base/test/test_waitable_event.h"
#include "net/base/ip_address.h"
#include "net/base/test_completion_callback.h"
#include "net/dns/dns_config.h"
#include "net/dns/dns_config_service.h"
#include "net/dns/nsswitch_reader.h"
#include "net/dns/public/dns_protocol.h"
#include "net/test/test_with_task_environment.h"
#include "testing/gmock/include/gmock/gmock.h"
#include "testing/gtest/include/gtest/gtest.h"
#include "third_party/abseil-cpp/absl/types/optional.h"
namespace net {
namespace {
// MAXNS is normally 3, but let's test 4 if possible.
const char* const kNameserversIPv4[] = {
"8.8.8.8",
"192.168.1.1",
"63.1.2.4",
"1.0.0.1",
};
const char* const kNameserversIPv6[] = {
nullptr,
"2001:db8::42",
nullptr,
"::FFFF:129.144.52.38",
};
const std::vector<NsswitchReader::ServiceSpecification> kBasicNsswitchConfig = {
NsswitchReader::ServiceSpecification(NsswitchReader::Service::kFiles),
NsswitchReader::ServiceSpecification(NsswitchReader::Service::kDns)};
void DummyConfigCallback(const DnsConfig& config) {
// Do nothing
}
// Fills in |res| with sane configuration.
void InitializeResState(res_state res) {
memset(res, 0, sizeof(*res));
res->options =
RES_INIT | RES_RECURSE | RES_DEFNAMES | RES_DNSRCH | RES_ROTATE;
res->ndots = 2;
res->retrans = 4;
res->retry = 7;
const char kDnsrch[] =
"chromium.org"
"\0"
"example.com";
memcpy(res->defdname, kDnsrch, sizeof(kDnsrch));
res->dnsrch[0] = res->defdname;
res->dnsrch[1] = res->defdname + sizeof("chromium.org");
for (unsigned i = 0; i < std::size(kNameserversIPv4) && i < MAXNS; ++i) {
struct sockaddr_in sa;
sa.sin_family = AF_INET;
sa.sin_port = base::HostToNet16(NS_DEFAULTPORT + i);
inet_pton(AF_INET, kNameserversIPv4[i], &sa.sin_addr);
res->nsaddr_list[i] = sa;
++res->nscount;
}
// Install IPv6 addresses, replacing the corresponding IPv4 addresses.
unsigned nscount6 = 0;
for (unsigned i = 0; i < std::size(kNameserversIPv6) && i < MAXNS; ++i) {
if (!kNameserversIPv6[i])
continue;
// Must use malloc to mimic res_ninit. Expect to be freed in
// `TestResolvReader::CloseResState()`.
struct sockaddr_in6* sa6;
sa6 = static_cast<sockaddr_in6*>(malloc(sizeof(*sa6)));
sa6->sin6_family = AF_INET6;
sa6->sin6_port = base::HostToNet16(NS_DEFAULTPORT - i);
inet_pton(AF_INET6, kNameserversIPv6[i], &sa6->sin6_addr);
res->_u._ext.nsaddrs[i] = sa6;
memset(&res->nsaddr_list[i], 0, sizeof res->nsaddr_list[i]);
++nscount6;
}
res->_u._ext.nscount6 = nscount6;
}
void InitializeExpectedConfig(DnsConfig* config) {
config->ndots = 2;
config->fallback_period = kDnsDefaultFallbackPeriod;
config->attempts = 7;
config->rotate = true;
config->append_to_multi_label_name = true;
config->search.clear();
config->search.push_back("chromium.org");
config->search.push_back("example.com");
config->nameservers.clear();
for (unsigned i = 0; i < std::size(kNameserversIPv4) && i < MAXNS; ++i) {
IPAddress ip;
EXPECT_TRUE(ip.AssignFromIPLiteral(kNameserversIPv4[i]));
config->nameservers.emplace_back(ip, NS_DEFAULTPORT + i);
}
for (unsigned i = 0; i < std::size(kNameserversIPv6) && i < MAXNS; ++i) {
if (!kNameserversIPv6[i])
continue;
IPAddress ip;
EXPECT_TRUE(ip.AssignFromIPLiteral(kNameserversIPv6[i]));
config->nameservers[i] = IPEndPoint(ip, NS_DEFAULTPORT - i);
}
}
class CallbackHelper {
public:
absl::optional<DnsConfig> WaitForResult() {
run_loop_.Run();
return GetResult();
}
absl::optional<DnsConfig> GetResult() {
absl::optional<DnsConfig> result = std::move(config_);
return result;
}
DnsConfigService::CallbackType GetCallback() {
return base::BindRepeating(&CallbackHelper::OnComplete,
base::Unretained(this));
}
private:
void OnComplete(const DnsConfig& config) {
config_ = config;
run_loop_.Quit();
}
absl::optional<DnsConfig> config_;
base::RunLoop run_loop_;
};
// Helper to allow blocking on some point in the ThreadPool.
class BlockingHelper {
public:
~BlockingHelper() { EXPECT_EQ(state_, State::kUnblocked); }
// Called by the test code to wait for the block point to be reached.
void WaitUntilBlocked() {
CHECK_EQ(state_, State::kUnblocked);
state_ = State::kRunningUntilBlock;
CHECK(!run_loop_ || !run_loop_->running());
run_loop_.emplace();
run_loop_->Run();
CHECK_EQ(state_, State::kBlocked);
}
// Called by the ThreadPool code on reaching the block point.
void WaitUntilUnblocked() {
block_event_.Reset();
task_runner_->PostTask(FROM_HERE,
base::BindOnce(&BlockingHelper::OnBlockedCallback,
base::Unretained(this)));
block_event_.Wait();
blocker_event_.Signal();
}
// Called by the test code to unblock the ThreadPool code.
void Unblock() {
CHECK_EQ(state_, State::kBlocked);
CHECK(!block_event_.IsSignaled());
state_ = State::kUnblocked;
blocker_event_.Reset();
block_event_.Signal();
blocker_event_.Wait();
}
private:
enum class State {
kRunningUntilBlock,
kBlocked,
kUnblocked,
};
void OnBlockedCallback() {
CHECK_EQ(state_, State::kRunningUntilBlock);
CHECK(run_loop_.has_value());
CHECK(run_loop_->running());
state_ = State::kBlocked;
run_loop_->Quit();
}
State state_ = State::kUnblocked;
absl::optional<base::RunLoop> run_loop_;
base::TestWaitableEvent block_event_;
base::TestWaitableEvent blocker_event_;
scoped_refptr<base::SingleThreadTaskRunner> task_runner_ =
base::SingleThreadTaskRunner::GetCurrentDefault();
};
class TestScopedResState : public ScopedResState {
public:
explicit TestScopedResState(std::unique_ptr<struct __res_state> res)
: res_(std::move(res)) {}
~TestScopedResState() override {
if (res_) {
// Assume `res->_u._ext.nsaddrs` memory allocated via malloc, e.g. by
// `InitializeResState()`.
for (int i = 0; i < res_->nscount; ++i) {
if (res_->_u._ext.nsaddrs[i] != nullptr)
free(res_->_u._ext.nsaddrs[i]);
}
}
}
const struct __res_state& state() const override {
EXPECT_TRUE(res_);
return *res_;
}
private:
std::unique_ptr<struct __res_state> res_;
};
class TestResolvReader : public ResolvReader {
public:
~TestResolvReader() override = default;
void set_value(std::unique_ptr<struct __res_state> value) {
CHECK(!value_);
value_ = std::make_unique<TestScopedResState>(std::move(value));
}
bool closed() { return !value_; }
// ResolvReader:
std::unique_ptr<ScopedResState> GetResState() override {
if (blocking_helper_)
blocking_helper_->WaitUntilUnblocked();
CHECK(value_);
return std::move(value_);
}
void set_blocking_helper(BlockingHelper* blocking_helper) {
blocking_helper_ = blocking_helper;
}
private:
std::unique_ptr<TestScopedResState> value_;
raw_ptr<BlockingHelper> blocking_helper_ = nullptr;
};
class TestNsswitchReader : public NsswitchReader {
public:
void set_value(std::vector<ServiceSpecification> value) {
value_ = std::move(value);
}
// NsswitchReader:
std::vector<ServiceSpecification> ReadAndParseHosts() override {
return value_;
}
private:
std::vector<ServiceSpecification> value_;
};
class DnsConfigServiceLinuxTest : public ::testing::Test,
public WithTaskEnvironment {
public:
DnsConfigServiceLinuxTest()
: WithTaskEnvironment(
base::test::TaskEnvironment::TimeSource::MOCK_TIME) {
auto resolv_reader = std::make_unique<TestResolvReader>();
resolv_reader_ = resolv_reader.get();
service_.set_resolv_reader_for_testing(std::move(resolv_reader));
auto nsswitch_reader = std::make_unique<TestNsswitchReader>();
nsswitch_reader_ = nsswitch_reader.get();
service_.set_nsswitch_reader_for_testing(std::move(nsswitch_reader));
}
protected:
internal::DnsConfigServiceLinux service_;
raw_ptr<TestResolvReader> resolv_reader_;
raw_ptr<TestNsswitchReader> nsswitch_reader_;
};
// Regression test to verify crash does not occur if DnsConfigServiceLinux
// instance is destroyed without calling WatchConfig()
TEST_F(DnsConfigServiceLinuxTest, CreateAndDestroy) {
auto service = std::make_unique<internal::DnsConfigServiceLinux>();
service.reset();
RunUntilIdle();
}
TEST_F(DnsConfigServiceLinuxTest, ConvertResStateToDnsConfig) {
auto res = std::make_unique<struct __res_state>();
InitializeResState(res.get());
resolv_reader_->set_value(std::move(res));
nsswitch_reader_->set_value(kBasicNsswitchConfig);
CallbackHelper callback_helper;
service_.ReadConfig(callback_helper.GetCallback());
absl::optional<DnsConfig> config = callback_helper.WaitForResult();
ASSERT_TRUE(config.has_value());
EXPECT_TRUE(config->IsValid());
DnsConfig expected_config;
EXPECT_FALSE(expected_config.EqualsIgnoreHosts(config.value()));
InitializeExpectedConfig(&expected_config);
EXPECT_TRUE(expected_config.EqualsIgnoreHosts(config.value()));
EXPECT_TRUE(resolv_reader_->closed());
}
TEST_F(DnsConfigServiceLinuxTest, RejectEmptyNameserver) {
auto res = std::make_unique<struct __res_state>();
res->options = RES_INIT | RES_RECURSE | RES_DEFNAMES | RES_DNSRCH;
const char kDnsrch[] = "chromium.org";
memcpy(res->defdname, kDnsrch, sizeof(kDnsrch));
res->dnsrch[0] = res->defdname;
struct sockaddr_in sa = {};
sa.sin_family = AF_INET;
sa.sin_port = base::HostToNet16(NS_DEFAULTPORT);
sa.sin_addr.s_addr = INADDR_ANY;
res->nsaddr_list[0] = sa;
sa.sin_addr.s_addr = 0xCAFE1337;
res->nsaddr_list[1] = sa;
res->nscount = 2;
resolv_reader_->set_value(std::move(res));
nsswitch_reader_->set_value(kBasicNsswitchConfig);
CallbackHelper callback_helper;
service_.ReadConfig(callback_helper.GetCallback());
RunUntilIdle();
absl::optional<DnsConfig> config = callback_helper.GetResult();
EXPECT_FALSE(config.has_value());
EXPECT_TRUE(resolv_reader_->closed());
}
TEST_F(DnsConfigServiceLinuxTest, AcceptNonEmptyNameserver) {
auto res = std::make_unique<struct __res_state>();
res->options = RES_INIT | RES_RECURSE | RES_DEFNAMES | RES_DNSRCH;
const char kDnsrch[] = "chromium.org";
memcpy(res->defdname, kDnsrch, sizeof(kDnsrch));
res->dnsrch[0] = res->defdname;
struct sockaddr_in sa = {};
sa.sin_family = AF_INET;
sa.sin_port = base::HostToNet16(NS_DEFAULTPORT);
sa.sin_addr.s_addr = 0xDEADBEEF;
res->nsaddr_list[0] = sa;
sa.sin_addr.s_addr = 0xCAFE1337;
res->nsaddr_list[1] = sa;
res->nscount = 2;
resolv_reader_->set_value(std::move(res));
nsswitch_reader_->set_value(kBasicNsswitchConfig);
CallbackHelper callback_helper;
service_.ReadConfig(callback_helper.GetCallback());
absl::optional<DnsConfig> config = callback_helper.WaitForResult();
EXPECT_TRUE(config.has_value());
EXPECT_TRUE(resolv_reader_->closed());
}
// Regression test to verify crash does not occur if DnsConfigServiceLinux
// instance is destroyed while SerialWorker jobs have posted to worker pool.
TEST_F(DnsConfigServiceLinuxTest, DestroyWhileJobsWorking) {
auto service = std::make_unique<internal::DnsConfigServiceLinux>();
// Call WatchConfig() which also tests ReadConfig().
service->WatchConfig(base::BindRepeating(&DummyConfigCallback));
service.reset();
FastForwardUntilNoTasksRemain();
}
// Regression test to verify crash does not occur if DnsConfigServiceLinux
// instance is destroyed on another thread.
TEST_F(DnsConfigServiceLinuxTest, DestroyOnDifferentThread) {
scoped_refptr<base::SequencedTaskRunner> runner =
base::ThreadPool::CreateSequencedTaskRunner({base::MayBlock()});
std::unique_ptr<internal::DnsConfigServiceLinux, base::OnTaskRunnerDeleter>
service(new internal::DnsConfigServiceLinux(),
base::OnTaskRunnerDeleter(runner));
runner->PostTask(FROM_HERE,
base::BindOnce(&internal::DnsConfigServiceLinux::WatchConfig,
base::Unretained(service.get()),
base::BindRepeating(&DummyConfigCallback)));
service.reset();
RunUntilIdle();
}
TEST_F(DnsConfigServiceLinuxTest, AcceptsBasicNsswitchConfig) {
auto res = std::make_unique<struct __res_state>();
InitializeResState(res.get());
resolv_reader_->set_value(std::move(res));
nsswitch_reader_->set_value(kBasicNsswitchConfig);
CallbackHelper callback_helper;
service_.ReadConfig(callback_helper.GetCallback());
absl::optional<DnsConfig> config = callback_helper.WaitForResult();
EXPECT_TRUE(resolv_reader_->closed());
ASSERT_TRUE(config.has_value());
EXPECT_TRUE(config->IsValid());
EXPECT_FALSE(config->unhandled_options);
}
TEST_F(DnsConfigServiceLinuxTest,
IgnoresBasicNsswitchConfigIfResolvConfigUnhandled) {
auto res = std::make_unique<struct __res_state>();
InitializeResState(res.get());
res->options |= RES_USE_DNSSEC; // Expect unhandled.
resolv_reader_->set_value(std::move(res));
nsswitch_reader_->set_value(kBasicNsswitchConfig);
CallbackHelper callback_helper;
service_.ReadConfig(callback_helper.GetCallback());
absl::optional<DnsConfig> config = callback_helper.WaitForResult();
EXPECT_TRUE(resolv_reader_->closed());
ASSERT_TRUE(config.has_value());
EXPECT_TRUE(config->IsValid());
EXPECT_TRUE(config->unhandled_options);
}
TEST_F(DnsConfigServiceLinuxTest, RejectsNsswitchWithoutFiles) {
auto res = std::make_unique<struct __res_state>();
InitializeResState(res.get());
resolv_reader_->set_value(std::move(res));
nsswitch_reader_->set_value(
{NsswitchReader::ServiceSpecification(NsswitchReader::Service::kDns)});
CallbackHelper callback_helper;
service_.ReadConfig(callback_helper.GetCallback());
absl::optional<DnsConfig> config = callback_helper.WaitForResult();
EXPECT_TRUE(resolv_reader_->closed());
ASSERT_TRUE(config.has_value());
EXPECT_TRUE(config->IsValid());
EXPECT_TRUE(config->unhandled_options);
}
TEST_F(DnsConfigServiceLinuxTest, RejectsWithExtraFiles) {
auto res = std::make_unique<struct __res_state>();
InitializeResState(res.get());
resolv_reader_->set_value(std::move(res));
nsswitch_reader_->set_value(
{NsswitchReader::ServiceSpecification(NsswitchReader::Service::kFiles),
NsswitchReader::ServiceSpecification(NsswitchReader::Service::kFiles),
NsswitchReader::ServiceSpecification(NsswitchReader::Service::kDns)});
CallbackHelper callback_helper;
service_.ReadConfig(callback_helper.GetCallback());
absl::optional<DnsConfig> config = callback_helper.WaitForResult();
EXPECT_TRUE(resolv_reader_->closed());
ASSERT_TRUE(config.has_value());
EXPECT_TRUE(config->IsValid());
EXPECT_TRUE(config->unhandled_options);
}
TEST_F(DnsConfigServiceLinuxTest, IgnoresRedundantActions) {
auto res = std::make_unique<struct __res_state>();
InitializeResState(res.get());
resolv_reader_->set_value(std::move(res));
nsswitch_reader_->set_value(
{NsswitchReader::ServiceSpecification(
NsswitchReader::Service::kFiles,
{{/*negated=*/false, NsswitchReader::Status::kSuccess,
NsswitchReader::Action::kReturn},
{/*negated=*/true, NsswitchReader::Status::kSuccess,
NsswitchReader::Action::kContinue}}),
NsswitchReader::ServiceSpecification(
NsswitchReader::Service::kDns,
{{/*negated=*/false, NsswitchReader::Status::kSuccess,
NsswitchReader::Action::kReturn},
{/*negated=*/true, NsswitchReader::Status::kSuccess,
NsswitchReader::Action::kContinue}})});
CallbackHelper callback_helper;
service_.ReadConfig(callback_helper.GetCallback());
absl::optional<DnsConfig> config = callback_helper.WaitForResult();
EXPECT_TRUE(resolv_reader_->closed());
ASSERT_TRUE(config.has_value());
EXPECT_TRUE(config->IsValid());
EXPECT_FALSE(config->unhandled_options);
}
TEST_F(DnsConfigServiceLinuxTest, RejectsInconsistentActions) {
auto res = std::make_unique<struct __res_state>();
InitializeResState(res.get());
resolv_reader_->set_value(std::move(res));
nsswitch_reader_->set_value(
{NsswitchReader::ServiceSpecification(NsswitchReader::Service::kFiles),
NsswitchReader::ServiceSpecification(
NsswitchReader::Service::kDns,
{{/*negated=*/false, NsswitchReader::Status::kUnavailable,
NsswitchReader::Action::kReturn},
{/*negated=*/true, NsswitchReader::Status::kSuccess,
NsswitchReader::Action::kContinue}})});
CallbackHelper callback_helper;
service_.ReadConfig(callback_helper.GetCallback());
absl::optional<DnsConfig> config = callback_helper.WaitForResult();
EXPECT_TRUE(resolv_reader_->closed());
ASSERT_TRUE(config.has_value());
EXPECT_TRUE(config->IsValid());
EXPECT_TRUE(config->unhandled_options);
}
TEST_F(DnsConfigServiceLinuxTest, RejectsWithBadFilesSuccessAction) {
auto res = std::make_unique<struct __res_state>();
InitializeResState(res.get());
resolv_reader_->set_value(std::move(res));
nsswitch_reader_->set_value(
{NsswitchReader::ServiceSpecification(
NsswitchReader::Service::kFiles,
{{/*negated=*/false, NsswitchReader::Status::kSuccess,
NsswitchReader::Action::kContinue}}),
NsswitchReader::ServiceSpecification(NsswitchReader::Service::kDns)});
CallbackHelper callback_helper;
service_.ReadConfig(callback_helper.GetCallback());
absl::optional<DnsConfig> config = callback_helper.WaitForResult();
EXPECT_TRUE(resolv_reader_->closed());
ASSERT_TRUE(config.has_value());
EXPECT_TRUE(config->IsValid());
EXPECT_TRUE(config->unhandled_options);
}
TEST_F(DnsConfigServiceLinuxTest, RejectsWithBadFilesNotFoundAction) {
auto res = std::make_unique<struct __res_state>();
InitializeResState(res.get());
resolv_reader_->set_value(std::move(res));
nsswitch_reader_->set_value(
{NsswitchReader::ServiceSpecification(
NsswitchReader::Service::kFiles,
{{/*negated=*/false, NsswitchReader::Status::kNotFound,
NsswitchReader::Action::kReturn}}),
NsswitchReader::ServiceSpecification(NsswitchReader::Service::kDns)});
CallbackHelper callback_helper;
service_.ReadConfig(callback_helper.GetCallback());
absl::optional<DnsConfig> config = callback_helper.WaitForResult();
EXPECT_TRUE(resolv_reader_->closed());
ASSERT_TRUE(config.has_value());
EXPECT_TRUE(config->IsValid());
EXPECT_TRUE(config->unhandled_options);
}
TEST_F(DnsConfigServiceLinuxTest, RejectsNsswitchWithoutDns) {
auto res = std::make_unique<struct __res_state>();
InitializeResState(res.get());
resolv_reader_->set_value(std::move(res));
nsswitch_reader_->set_value(
{NsswitchReader::ServiceSpecification(NsswitchReader::Service::kFiles)});
CallbackHelper callback_helper;
service_.ReadConfig(callback_helper.GetCallback());
absl::optional<DnsConfig> config = callback_helper.WaitForResult();
EXPECT_TRUE(resolv_reader_->closed());
ASSERT_TRUE(config.has_value());
EXPECT_TRUE(config->IsValid());
EXPECT_TRUE(config->unhandled_options);
}
TEST_F(DnsConfigServiceLinuxTest, RejectsWithBadDnsSuccessAction) {
auto res = std::make_unique<struct __res_state>();
InitializeResState(res.get());
resolv_reader_->set_value(std::move(res));
nsswitch_reader_->set_value(
{NsswitchReader::ServiceSpecification(NsswitchReader::Service::kFiles),
NsswitchReader::ServiceSpecification(
NsswitchReader::Service::kDns,
{{/*negated=*/false, NsswitchReader::Status::kSuccess,
NsswitchReader::Action::kContinue}})});
CallbackHelper callback_helper;
service_.ReadConfig(callback_helper.GetCallback());
absl::optional<DnsConfig> config = callback_helper.WaitForResult();
EXPECT_TRUE(resolv_reader_->closed());
ASSERT_TRUE(config.has_value());
EXPECT_TRUE(config->IsValid());
EXPECT_TRUE(config->unhandled_options);
}
TEST_F(DnsConfigServiceLinuxTest, RejectsNsswitchWithMisorderedServices) {
auto res = std::make_unique<struct __res_state>();
InitializeResState(res.get());
resolv_reader_->set_value(std::move(res));
nsswitch_reader_->set_value(
{NsswitchReader::ServiceSpecification(NsswitchReader::Service::kDns),
NsswitchReader::ServiceSpecification(NsswitchReader::Service::kFiles)});
CallbackHelper callback_helper;
service_.ReadConfig(callback_helper.GetCallback());
absl::optional<DnsConfig> config = callback_helper.WaitForResult();
EXPECT_TRUE(resolv_reader_->closed());
ASSERT_TRUE(config.has_value());
EXPECT_TRUE(config->IsValid());
EXPECT_TRUE(config->unhandled_options);
}
TEST_F(DnsConfigServiceLinuxTest, AcceptsIncompatibleNsswitchServicesAfterDns) {
auto res = std::make_unique<struct __res_state>();
InitializeResState(res.get());
resolv_reader_->set_value(std::move(res));
nsswitch_reader_->set_value(
{NsswitchReader::ServiceSpecification(NsswitchReader::Service::kFiles),
NsswitchReader::ServiceSpecification(NsswitchReader::Service::kDns),
NsswitchReader::ServiceSpecification(NsswitchReader::Service::kMdns)});
CallbackHelper callback_helper;
service_.ReadConfig(callback_helper.GetCallback());
absl::optional<DnsConfig> config = callback_helper.WaitForResult();
EXPECT_TRUE(resolv_reader_->closed());
ASSERT_TRUE(config.has_value());
EXPECT_TRUE(config->IsValid());
EXPECT_FALSE(config->unhandled_options);
}
TEST_F(DnsConfigServiceLinuxTest, RejectsNsswitchMdns) {
auto res = std::make_unique<struct __res_state>();
InitializeResState(res.get());
resolv_reader_->set_value(std::move(res));
nsswitch_reader_->set_value(
{NsswitchReader::ServiceSpecification(NsswitchReader::Service::kFiles),
NsswitchReader::ServiceSpecification(NsswitchReader::Service::kMdns),
NsswitchReader::ServiceSpecification(NsswitchReader::Service::kDns)});
CallbackHelper callback_helper;
service_.ReadConfig(callback_helper.GetCallback());
absl::optional<DnsConfig> config = callback_helper.WaitForResult();
EXPECT_TRUE(resolv_reader_->closed());
ASSERT_TRUE(config.has_value());
EXPECT_TRUE(config->IsValid());
EXPECT_TRUE(config->unhandled_options);
}
TEST_F(DnsConfigServiceLinuxTest, RejectsNsswitchMdns4) {
auto res = std::make_unique<struct __res_state>();
InitializeResState(res.get());
resolv_reader_->set_value(std::move(res));
nsswitch_reader_->set_value(
{NsswitchReader::ServiceSpecification(NsswitchReader::Service::kFiles),
NsswitchReader::ServiceSpecification(NsswitchReader::Service::kMdns4),
NsswitchReader::ServiceSpecification(NsswitchReader::Service::kDns)});
CallbackHelper callback_helper;
service_.ReadConfig(callback_helper.GetCallback());
absl::optional<DnsConfig> config = callback_helper.WaitForResult();
EXPECT_TRUE(resolv_reader_->closed());
ASSERT_TRUE(config.has_value());
EXPECT_TRUE(config->IsValid());
EXPECT_TRUE(config->unhandled_options);
}
TEST_F(DnsConfigServiceLinuxTest, RejectsNsswitchMdns6) {
auto res = std::make_unique<struct __res_state>();
InitializeResState(res.get());
resolv_reader_->set_value(std::move(res));
nsswitch_reader_->set_value(
{NsswitchReader::ServiceSpecification(NsswitchReader::Service::kFiles),
NsswitchReader::ServiceSpecification(NsswitchReader::Service::kMdns6),
NsswitchReader::ServiceSpecification(NsswitchReader::Service::kDns)});
CallbackHelper callback_helper;
service_.ReadConfig(callback_helper.GetCallback());
absl::optional<DnsConfig> config = callback_helper.WaitForResult();
EXPECT_TRUE(resolv_reader_->closed());
ASSERT_TRUE(config.has_value());
EXPECT_TRUE(config->IsValid());
EXPECT_TRUE(config->unhandled_options);
}
TEST_F(DnsConfigServiceLinuxTest, AcceptsNsswitchMdnsMinimal) {
auto res = std::make_unique<struct __res_state>();
InitializeResState(res.get());
resolv_reader_->set_value(std::move(res));
nsswitch_reader_->set_value(
{NsswitchReader::ServiceSpecification(NsswitchReader::Service::kFiles),
NsswitchReader::ServiceSpecification(
NsswitchReader::Service::kMdnsMinimal),
NsswitchReader::ServiceSpecification(
NsswitchReader::Service::kMdns4Minimal),
NsswitchReader::ServiceSpecification(
NsswitchReader::Service::kMdns6Minimal),
NsswitchReader::ServiceSpecification(NsswitchReader::Service::kDns)});
CallbackHelper callback_helper;
service_.ReadConfig(callback_helper.GetCallback());
absl::optional<DnsConfig> config = callback_helper.WaitForResult();
EXPECT_TRUE(resolv_reader_->closed());
ASSERT_TRUE(config.has_value());
EXPECT_TRUE(config->IsValid());
EXPECT_FALSE(config->unhandled_options);
}
// mdns*_minimal is often paired with [!UNAVAIL=RETURN] or [NOTFOUND=RETURN]
// actions. Ensure that is accepted.
TEST_F(DnsConfigServiceLinuxTest, AcceptsNsswitchMdnsMinimalWithCommonActions) {
auto res = std::make_unique<struct __res_state>();
InitializeResState(res.get());
resolv_reader_->set_value(std::move(res));
nsswitch_reader_->set_value(
{NsswitchReader::ServiceSpecification(NsswitchReader::Service::kFiles),
NsswitchReader::ServiceSpecification(
NsswitchReader::Service::kMdnsMinimal,
{{/*negated=*/true, NsswitchReader::Status::kUnavailable,
NsswitchReader::Action::kReturn}}),
NsswitchReader::ServiceSpecification(
NsswitchReader::Service::kMdns4Minimal,
{{/*negated=*/false, NsswitchReader::Status::kNotFound,
NsswitchReader::Action::kReturn}}),
NsswitchReader::ServiceSpecification(
NsswitchReader::Service::kMdns6Minimal,
{{/*negated=*/true, NsswitchReader::Status::kUnavailable,
NsswitchReader::Action::kReturn}}),
NsswitchReader::ServiceSpecification(NsswitchReader::Service::kDns)});
CallbackHelper callback_helper;
service_.ReadConfig(callback_helper.GetCallback());
absl::optional<DnsConfig> config = callback_helper.WaitForResult();
EXPECT_TRUE(resolv_reader_->closed());
ASSERT_TRUE(config.has_value());
EXPECT_TRUE(config->IsValid());
EXPECT_FALSE(config->unhandled_options);
}
TEST_F(DnsConfigServiceLinuxTest, RejectsWithBadMdnsMinimalUnavailableAction) {
auto res = std::make_unique<struct __res_state>();
InitializeResState(res.get());
resolv_reader_->set_value(std::move(res));
nsswitch_reader_->set_value(
{NsswitchReader::ServiceSpecification(NsswitchReader::Service::kFiles),
NsswitchReader::ServiceSpecification(
NsswitchReader::Service::kMdnsMinimal,
{{/*negated=*/false, NsswitchReader::Status::kUnavailable,
NsswitchReader::Action::kReturn}}),
NsswitchReader::ServiceSpecification(NsswitchReader::Service::kDns)});
CallbackHelper callback_helper;
service_.ReadConfig(callback_helper.GetCallback());
absl::optional<DnsConfig> config = callback_helper.WaitForResult();
EXPECT_TRUE(resolv_reader_->closed());
ASSERT_TRUE(config.has_value());
EXPECT_TRUE(config->IsValid());
EXPECT_TRUE(config->unhandled_options);
}
TEST_F(DnsConfigServiceLinuxTest, AcceptsNsswitchMyHostname) {
auto res = std::make_unique<struct __res_state>();
InitializeResState(res.get());
resolv_reader_->set_value(std::move(res));
nsswitch_reader_->set_value(
{NsswitchReader::ServiceSpecification(NsswitchReader::Service::kFiles),
NsswitchReader::ServiceSpecification(
NsswitchReader::Service::kMyHostname),
NsswitchReader::ServiceSpecification(NsswitchReader::Service::kDns)});
CallbackHelper callback_helper;
service_.ReadConfig(callback_helper.GetCallback());
absl::optional<DnsConfig> config = callback_helper.WaitForResult();
EXPECT_TRUE(resolv_reader_->closed());
ASSERT_TRUE(config.has_value());
EXPECT_TRUE(config->IsValid());
EXPECT_FALSE(config->unhandled_options);
}
TEST_F(DnsConfigServiceLinuxTest, RejectsWithBadMyHostnameNotFoundAction) {
auto res = std::make_unique<struct __res_state>();
InitializeResState(res.get());
resolv_reader_->set_value(std::move(res));
nsswitch_reader_->set_value(
{NsswitchReader::ServiceSpecification(NsswitchReader::Service::kFiles),
NsswitchReader::ServiceSpecification(
NsswitchReader::Service::kMyHostname,
{{/*negated=*/false, NsswitchReader::Status::kNotFound,
NsswitchReader::Action::kReturn}}),
NsswitchReader::ServiceSpecification(NsswitchReader::Service::kDns)});
CallbackHelper callback_helper;
service_.ReadConfig(callback_helper.GetCallback());
absl::optional<DnsConfig> config = callback_helper.WaitForResult();
EXPECT_TRUE(resolv_reader_->closed());
ASSERT_TRUE(config.has_value());
EXPECT_TRUE(config->IsValid());
EXPECT_TRUE(config->unhandled_options);
}
TEST_F(DnsConfigServiceLinuxTest, RejectsNsswitchResolve) {
auto res = std::make_unique<struct __res_state>();
InitializeResState(res.get());
resolv_reader_->set_value(std::move(res));
nsswitch_reader_->set_value(
{NsswitchReader::ServiceSpecification(NsswitchReader::Service::kFiles),
NsswitchReader::ServiceSpecification(NsswitchReader::Service::kResolve),
NsswitchReader::ServiceSpecification(NsswitchReader::Service::kDns)});
CallbackHelper callback_helper;
service_.ReadConfig(callback_helper.GetCallback());
absl::optional<DnsConfig> config = callback_helper.WaitForResult();
EXPECT_TRUE(resolv_reader_->closed());
ASSERT_TRUE(config.has_value());
EXPECT_TRUE(config->IsValid());
EXPECT_TRUE(config->unhandled_options);
}
TEST_F(DnsConfigServiceLinuxTest, RejectsNsswitchNis) {
auto res = std::make_unique<struct __res_state>();
InitializeResState(res.get());
resolv_reader_->set_value(std::move(res));
nsswitch_reader_->set_value(
{NsswitchReader::ServiceSpecification(NsswitchReader::Service::kFiles),
NsswitchReader::ServiceSpecification(NsswitchReader::Service::kNis),
NsswitchReader::ServiceSpecification(NsswitchReader::Service::kDns)});
CallbackHelper callback_helper;
service_.ReadConfig(callback_helper.GetCallback());
absl::optional<DnsConfig> config = callback_helper.WaitForResult();
EXPECT_TRUE(resolv_reader_->closed());
ASSERT_TRUE(config.has_value());
EXPECT_TRUE(config->IsValid());
EXPECT_TRUE(config->unhandled_options);
}
TEST_F(DnsConfigServiceLinuxTest, RejectsWithBadNisNotFoundAction) {
auto res = std::make_unique<struct __res_state>();
InitializeResState(res.get());
resolv_reader_->set_value(std::move(res));
nsswitch_reader_->set_value(
{NsswitchReader::ServiceSpecification(NsswitchReader::Service::kFiles),
NsswitchReader::ServiceSpecification(
NsswitchReader::Service::kNis,
{{/*negated=*/false, NsswitchReader::Status::kNotFound,
NsswitchReader::Action::kReturn}}),
NsswitchReader::ServiceSpecification(NsswitchReader::Service::kDns)});
CallbackHelper callback_helper;
service_.ReadConfig(callback_helper.GetCallback());
absl::optional<DnsConfig> config = callback_helper.WaitForResult();
EXPECT_TRUE(resolv_reader_->closed());
ASSERT_TRUE(config.has_value());
EXPECT_TRUE(config->IsValid());
EXPECT_TRUE(config->unhandled_options);
}
TEST_F(DnsConfigServiceLinuxTest, RejectsNsswitchUnknown) {
auto res = std::make_unique<struct __res_state>();
InitializeResState(res.get());
resolv_reader_->set_value(std::move(res));
nsswitch_reader_->set_value(
{NsswitchReader::ServiceSpecification(NsswitchReader::Service::kFiles),
NsswitchReader::ServiceSpecification(NsswitchReader::Service::kUnknown),
NsswitchReader::ServiceSpecification(NsswitchReader::Service::kDns)});
CallbackHelper callback_helper;
service_.ReadConfig(callback_helper.GetCallback());
absl::optional<DnsConfig> config = callback_helper.WaitForResult();
EXPECT_TRUE(resolv_reader_->closed());
ASSERT_TRUE(config.has_value());
EXPECT_TRUE(config->IsValid());
EXPECT_TRUE(config->unhandled_options);
}
TEST_F(DnsConfigServiceLinuxTest, FreshReadsAfterAdditionalTriggers) {
BlockingHelper blocking_helper;
resolv_reader_->set_blocking_helper(&blocking_helper);
CallbackHelper callback_helper;
service_.ReadConfig(callback_helper.GetCallback());
// Expect work to be blocked.
blocking_helper.WaitUntilBlocked();
ASSERT_FALSE(callback_helper.GetResult());
// Signal config changes (trigger a few times to confirm only one fresh read
// is performed).
service_.TriggerOnConfigChangedForTesting(/*succeeded=*/true);
service_.TriggerOnConfigChangedForTesting(/*succeeded=*/true);
service_.TriggerOnConfigChangedForTesting(/*succeeded=*/true);
// Initial results (expect to be replaced with second read)
auto res = std::make_unique<struct __res_state>();
InitializeResState(res.get());
resolv_reader_->set_value(std::move(res));
nsswitch_reader_->set_value(kBasicNsswitchConfig);
// Unblock first read (expect no completion because second read should begin
// immediately)
blocking_helper.Unblock();
blocking_helper.WaitUntilBlocked();
ASSERT_FALSE(callback_helper.GetResult());
EXPECT_TRUE(resolv_reader_->closed());
// Setup a new config to confirm a fresh read is performed.
res = std::make_unique<struct __res_state>();
res->options = RES_INIT | RES_RECURSE | RES_DEFNAMES | RES_DNSRCH;
struct sockaddr_in sa = {};
sa.sin_family = AF_INET;
sa.sin_port = base::HostToNet16(1000);
inet_pton(AF_INET, "1.2.3.4", &sa.sin_addr);
res->nsaddr_list[0] = sa;
res->nscount = 1;
resolv_reader_->set_value(std::move(res));
// Unblock second read (expect completion)
blocking_helper.Unblock();
absl::optional<DnsConfig> config = callback_helper.WaitForResult();
ASSERT_TRUE(config.has_value());
EXPECT_TRUE(config->IsValid());
IPEndPoint expected(IPAddress(1, 2, 3, 4), 1000);
EXPECT_THAT(config.value().nameservers, testing::ElementsAre(expected));
EXPECT_TRUE(resolv_reader_->closed());
}
} // namespace
} // namespace net
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