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// Copyright 2023 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/loopback_only.h"
#include <unordered_set>
#include "base/test/bind.h"
#include "base/test/task_environment.h"
#include "base/threading/thread_restrictions.h"
#include "net/base/mock_network_change_notifier.h"
#include "net/base/network_change_notifier.h"
#include "net/base/test_completion_callback.h"
#include "testing/gtest/include/gtest/gtest.h"
#include "third_party/abseil-cpp/absl/types/optional.h"
#if BUILDFLAG(IS_LINUX)
#include <linux/if.h>
#include <linux/netlink.h>
#include <linux/rtnetlink.h>
#include "net/base/address_map_linux.h"
#endif // BUILDFLAG(IS_LINUX)
namespace net {
#if BUILDFLAG(IS_LINUX)
namespace {
constexpr uint8_t kIpv4LoopbackBytes[] = {127, 0, 0, 1};
constexpr uint8_t kIpv4PrivateAddressBytes[] = {10, 0, 0, 1};
constexpr uint8_t kIpv6LoopbackBytes[] = {0, 0, 0, 0, 0, 0, 0, 0,
0, 0, 0, 0, 0, 0, 0, 1};
constexpr uint8_t kIpv6AddressBytes[] = {0xFE, 0xDC, 0xBA, 0x98, 0, 0, 0, 0,
0, 0, 0, 0, 0, 0, 0, 0};
constexpr uint8_t kIpv4LinkLocalBytes[] = {169, 254, 0, 0};
constexpr uint8_t kIpv4InIpv6LinkLocalBytes[] = {
0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0xFF, 0xFF, 169, 254, 0, 0};
constexpr uint8_t kIpv6LinkLocalBytes[] = {0xFE, 0x80, 0, 0, 0, 0, 0, 0,
0, 0, 0, 0, 0, 0, 0, 0};
class StubAddressMapOwnerLinux : public AddressMapOwnerLinux {
public:
AddressMap GetAddressMap() const override { return address_map_; }
std::unordered_set<int> GetOnlineLinks() const override {
return online_links_;
}
AddressMap& address_map() { return address_map_; }
std::unordered_set<int>& online_links() { return online_links_; }
private:
AddressMap address_map_;
std::unordered_set<int> online_links_;
};
bool GetResultOfRunHaveOnlyLoopbackAddressesJob() {
bool result = false;
net::TestClosure completion;
{
base::ScopedDisallowBlocking disallow_blocking;
RunHaveOnlyLoopbackAddressesJob(
base::BindLambdaForTesting([&](bool loopback_result) {
result = loopback_result;
completion.closure().Run();
}));
}
completion.WaitForResult();
return result;
}
} // namespace
class LoopbackOnlyTest : public ::testing::Test {
public:
static constexpr int kTestInterfaceEth = 1;
static constexpr int kTestInterfaceLoopback = 2;
static inline const net::IPAddress kIpv4Loopback{kIpv4LoopbackBytes};
static inline const net::IPAddress kIpv4PrivateAddress{
kIpv4PrivateAddressBytes};
static inline const net::IPAddress kIpv6Loopback{kIpv6LoopbackBytes};
static inline const net::IPAddress kIpv6Address{kIpv6AddressBytes};
static inline const net::IPAddress kIpv4LinkLocal{kIpv4LinkLocalBytes};
static inline const net::IPAddress kIpv4InIpv6LinkLocal{
kIpv4InIpv6LinkLocalBytes};
static inline const net::IPAddress kIpv6LinkLocal{kIpv6LinkLocalBytes};
LoopbackOnlyTest() {
mock_notifier_.mock_network_change_notifier()->SetAddressMapOwnerLinux(
&stub_address_map_owner_);
}
~LoopbackOnlyTest() override = default;
protected:
base::test::TaskEnvironment task_environment_;
test::ScopedMockNetworkChangeNotifier mock_notifier_;
StubAddressMapOwnerLinux stub_address_map_owner_;
};
TEST_F(LoopbackOnlyTest, HasOnlyLoopbackIpv4) {
// Include only a loopback interface.
stub_address_map_owner_.address_map() = {
{kIpv4Loopback, ifaddrmsg{
.ifa_family = AF_INET,
.ifa_flags = IFA_F_TEMPORARY,
.ifa_index = kTestInterfaceLoopback,
}}};
// AddressTrackerLinux does not insert loopback interfaces into
// `online_links`.
stub_address_map_owner_.online_links() = {};
EXPECT_TRUE(GetResultOfRunHaveOnlyLoopbackAddressesJob());
}
TEST_F(LoopbackOnlyTest, HasActiveIPv4Connection) {
stub_address_map_owner_.address_map() = {
{kIpv4Loopback, ifaddrmsg{.ifa_family = AF_INET,
.ifa_flags = IFA_F_TEMPORARY,
.ifa_index = kTestInterfaceLoopback}},
{kIpv4PrivateAddress, ifaddrmsg{.ifa_family = AF_INET,
.ifa_flags = IFA_F_TEMPORARY,
.ifa_index = kTestInterfaceEth}}};
// `online_links` includes kTestInterfaceEth so that kIpv4PrivateAddress is
// the active IPv4 connection. Also, AddressTrackerLinux does not insert
// loopback interfaces into `online_links`.
stub_address_map_owner_.online_links() = {kTestInterfaceEth};
EXPECT_FALSE(GetResultOfRunHaveOnlyLoopbackAddressesJob());
}
TEST_F(LoopbackOnlyTest, HasInactiveIPv4Connection) {
stub_address_map_owner_.address_map() = {
{kIpv4Loopback, ifaddrmsg{.ifa_family = AF_INET,
.ifa_flags = IFA_F_TEMPORARY,
.ifa_index = kTestInterfaceLoopback}},
{kIpv4PrivateAddress, ifaddrmsg{.ifa_family = AF_INET,
.ifa_flags = IFA_F_TEMPORARY,
.ifa_index = kTestInterfaceEth}}};
// `online_links` does not include kTestInterfaceEth so that
// kIpv4PrivateAddress is the inactive IPv4 connection. Also,
// AddressTrackerLinux does not insert loopback interfaces into
// `online_links`.
stub_address_map_owner_.online_links() = {};
EXPECT_TRUE(GetResultOfRunHaveOnlyLoopbackAddressesJob());
}
TEST_F(LoopbackOnlyTest, HasOnlyLoopbackIpv6) {
// Include only a loopback interface.
stub_address_map_owner_.address_map() = {
{kIpv6Loopback, ifaddrmsg{
.ifa_family = AF_INET6,
.ifa_flags = IFA_F_TEMPORARY,
.ifa_index = kTestInterfaceLoopback,
}}};
// AddressTrackerLinux does not insert loopback interfaces into
// `online_links`.
stub_address_map_owner_.online_links() = {};
EXPECT_TRUE(GetResultOfRunHaveOnlyLoopbackAddressesJob());
}
TEST_F(LoopbackOnlyTest, HasActiveIPv6Connection) {
stub_address_map_owner_.address_map() = {
{kIpv6Loopback, ifaddrmsg{.ifa_family = AF_INET6,
.ifa_flags = IFA_F_TEMPORARY,
.ifa_index = kTestInterfaceLoopback}},
{kIpv6Address, ifaddrmsg{.ifa_family = AF_INET6,
.ifa_flags = IFA_F_TEMPORARY,
.ifa_index = kTestInterfaceEth}}};
// `online_links` includes kTestInterfaceEth so that kIpv6Address is the
// active IPv6 connection. Also, AddressTrackerLinux does not insert loopback
// interfaces into `online_links`.
stub_address_map_owner_.online_links() = {kTestInterfaceEth};
EXPECT_FALSE(GetResultOfRunHaveOnlyLoopbackAddressesJob());
}
TEST_F(LoopbackOnlyTest, HasInactiveIPv6Connection) {
stub_address_map_owner_.address_map() = {
{kIpv6Loopback, ifaddrmsg{.ifa_family = AF_INET6,
.ifa_flags = IFA_F_TEMPORARY,
.ifa_index = kTestInterfaceLoopback}},
{kIpv6Address, ifaddrmsg{.ifa_family = AF_INET6,
.ifa_flags = IFA_F_TEMPORARY,
.ifa_index = kTestInterfaceEth}}};
// `online_links` does not include kTestInterfaceEth so that kIpv6Address is
// the inactive IPv6 connection. Also, AddressTrackerLinux does not insert
// loopback interfaces into `online_links`.
stub_address_map_owner_.online_links() = {};
EXPECT_TRUE(GetResultOfRunHaveOnlyLoopbackAddressesJob());
}
TEST_F(LoopbackOnlyTest, IPv6LinkLocal) {
// Include only IPv6 link-local interfaces.
stub_address_map_owner_.address_map() = {
{kIpv6LinkLocal, ifaddrmsg{
.ifa_family = AF_INET6,
.ifa_flags = IFA_F_TEMPORARY,
.ifa_index = 3,
}}};
// Mark the IPv6 link-local interface as online.
stub_address_map_owner_.online_links() = {3};
EXPECT_TRUE(GetResultOfRunHaveOnlyLoopbackAddressesJob());
}
TEST_F(LoopbackOnlyTest, ExtraOnlineLinks) {
// Include only IPv6 link-local interfaces.
stub_address_map_owner_.address_map() = {
{kIpv6LinkLocal, ifaddrmsg{
.ifa_family = AF_INET6,
.ifa_flags = IFA_F_TEMPORARY,
.ifa_index = 3,
}}};
// AddressTrackerLinux should not give us online links other than the ones
// listed in the AddressMap. However, it's better if this code is resilient to
// a mismatch if there is a bug (for example if the kernel truncates the
// messages or the buffer the AddressTrackerLinux provides to the kernel is
// too small). And if this code runs on a different thread from the
// AddressMapOwnerLinux, AddressMap and online links are updated separately,
// and so it is possible they can be inconsistent with each other.
stub_address_map_owner_.online_links() = {1, 2, 3};
EXPECT_TRUE(GetResultOfRunHaveOnlyLoopbackAddressesJob());
}
// TODO(crbug.com/1450403): Test HaveOnlyLoopbackAddressesUsingGetifaddrs().
#endif // BUILDFLAG(IS_LINUX)
} // namespace net
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