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/*
* Copyright (C) 2018 The Android Open Source Project
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
#include "keychords.h"
#include <dirent.h>
#include <fcntl.h>
#include <linux/input.h>
#include <linux/uinput.h>
#include <stdint.h>
#include <sys/types.h>
#include <chrono>
#include <set>
#include <string>
#include <vector>
#include <android-base/properties.h>
#include <android-base/strings.h>
#include <gtest/gtest.h>
#include "epoll.h"
using namespace std::chrono_literals;
namespace android {
namespace init {
namespace {
// This class is used to inject keys.
class EventHandler {
public:
EventHandler();
EventHandler(const EventHandler&) = delete;
EventHandler(EventHandler&&) noexcept;
EventHandler& operator=(const EventHandler&) = delete;
EventHandler& operator=(EventHandler&&) noexcept;
~EventHandler() noexcept;
bool init();
bool send(struct input_event& e);
bool send(uint16_t type, uint16_t code, uint16_t value);
bool send(uint16_t code, bool value);
private:
int fd_;
};
EventHandler::EventHandler() : fd_(-1) {}
EventHandler::EventHandler(EventHandler&& rval) noexcept : fd_(rval.fd_) {
rval.fd_ = -1;
}
EventHandler& EventHandler::operator=(EventHandler&& rval) noexcept {
fd_ = rval.fd_;
rval.fd_ = -1;
return *this;
}
EventHandler::~EventHandler() {
if (fd_ == -1) return;
::ioctl(fd_, UI_DEV_DESTROY);
::close(fd_);
}
bool EventHandler::init() {
if (fd_ != -1) return true;
auto fd = TEMP_FAILURE_RETRY(::open("/dev/uinput", O_WRONLY | O_NONBLOCK | O_CLOEXEC));
if (fd == -1) return false;
if (::ioctl(fd, UI_SET_EVBIT, EV_KEY) == -1) {
::close(fd);
return false;
}
static const struct uinput_user_dev u = {
.name = "com.google.android.init.test",
.id.bustype = BUS_VIRTUAL,
.id.vendor = 0x1AE0, // Google
.id.product = 0x494E, // IN
.id.version = 1,
};
if (TEMP_FAILURE_RETRY(::write(fd, &u, sizeof(u))) != sizeof(u)) {
::close(fd);
return false;
}
// all keys
for (uint16_t i = 0; i < KEY_MAX; ++i) {
if (::ioctl(fd, UI_SET_KEYBIT, i) == -1) {
::close(fd);
return false;
}
}
if (::ioctl(fd, UI_DEV_CREATE) == -1) {
::close(fd);
return false;
}
fd_ = fd;
return true;
}
bool EventHandler::send(struct input_event& e) {
gettimeofday(&e.time, nullptr);
return TEMP_FAILURE_RETRY(::write(fd_, &e, sizeof(e))) == sizeof(e);
}
bool EventHandler::send(uint16_t type, uint16_t code, uint16_t value) {
struct input_event e = {.type = type, .code = code, .value = value};
return send(e);
}
bool EventHandler::send(uint16_t code, bool value) {
return (code < KEY_MAX) && init() && send(EV_KEY, code, value) && send(EV_SYN, SYN_REPORT, 0);
}
std::string InitFds(const char* prefix, pid_t pid = getpid()) {
std::string ret;
std::string init_fds("/proc/");
init_fds += std::to_string(pid) + "/fd";
std::unique_ptr<DIR, decltype(&closedir)> fds(opendir(init_fds.c_str()), closedir);
if (!fds) return ret;
dirent* entry;
while ((entry = readdir(fds.get()))) {
if (entry->d_name[0] == '.') continue;
std::string devname = init_fds + '/' + entry->d_name;
char buf[256];
auto retval = readlink(devname.c_str(), buf, sizeof(buf) - 1);
if ((retval < 0) || (size_t(retval) >= (sizeof(buf) - 1))) continue;
buf[retval] = '\0';
if (!android::base::StartsWith(buf, prefix)) continue;
if (ret.size() != 0) ret += ",";
ret += buf;
}
return ret;
}
std::string InitInputFds() {
return InitFds("/dev/input/");
}
std::string InitInotifyFds() {
return InitFds("anon_inode:inotify");
}
// NB: caller (this series of tests, or conversely the service parser in init)
// is responsible for validation, sorting and uniqueness of the chords, so no
// fuzzing is advised.
const std::vector<int> escape_chord = {KEY_ESC};
const std::vector<int> triple1_chord = {KEY_BACKSPACE, KEY_VOLUMEDOWN, KEY_VOLUMEUP};
const std::vector<int> triple2_chord = {KEY_VOLUMEDOWN, KEY_VOLUMEUP, KEY_BACK};
const std::vector<const std::vector<int>> empty_chords;
const std::vector<const std::vector<int>> chords = {
escape_chord,
triple1_chord,
triple2_chord,
};
class TestFrame {
public:
TestFrame(const std::vector<const std::vector<int>>& chords, EventHandler* ev = nullptr);
void RelaxForMs(std::chrono::milliseconds wait = 1ms);
void SetChord(int key, bool value = true);
void SetChords(const std::vector<int>& chord, bool value = true);
void ClrChord(int key);
void ClrChords(const std::vector<int>& chord);
bool IsOnlyChord(const std::vector<int>& chord) const;
bool IsNoChord() const;
bool IsChord(const std::vector<int>& chord) const;
void WaitForChord(const std::vector<int>& chord);
std::string Format() const;
private:
static std::string Format(const std::vector<const std::vector<int>>& chords);
Epoll epoll_;
Keychords keychords_;
std::vector<const std::vector<int>> keycodes_;
EventHandler* ev_;
};
TestFrame::TestFrame(const std::vector<const std::vector<int>>& chords, EventHandler* ev)
: ev_(ev) {
if (!epoll_.Open().ok()) return;
for (const auto& keycodes : chords) keychords_.Register(keycodes);
keychords_.Start(&epoll_, [this](const std::vector<int>& keycodes) {
this->keycodes_.emplace_back(keycodes);
});
}
void TestFrame::RelaxForMs(std::chrono::milliseconds wait) {
auto pending_functions = epoll_.Wait(wait);
ASSERT_RESULT_OK(pending_functions);
for (const auto& function : *pending_functions) {
(*function)();
}
}
void TestFrame::SetChord(int key, bool value) {
ASSERT_TRUE(!!ev_);
RelaxForMs();
EXPECT_TRUE(ev_->send(key, value));
}
void TestFrame::SetChords(const std::vector<int>& chord, bool value) {
ASSERT_TRUE(!!ev_);
for (auto& key : chord) SetChord(key, value);
RelaxForMs();
}
void TestFrame::ClrChord(int key) {
ASSERT_TRUE(!!ev_);
SetChord(key, false);
}
void TestFrame::ClrChords(const std::vector<int>& chord) {
ASSERT_TRUE(!!ev_);
SetChords(chord, false);
}
bool TestFrame::IsOnlyChord(const std::vector<int>& chord) const {
auto ret = false;
for (const auto& keycode : keycodes_) {
if (keycode != chord) return false;
ret = true;
}
return ret;
}
bool TestFrame::IsNoChord() const {
return keycodes_.empty();
}
bool TestFrame::IsChord(const std::vector<int>& chord) const {
for (const auto& keycode : keycodes_) {
if (keycode == chord) return true;
}
return false;
}
void TestFrame::WaitForChord(const std::vector<int>& chord) {
for (int retry = 1000; retry && !IsChord(chord); --retry) RelaxForMs();
}
std::string TestFrame::Format(const std::vector<const std::vector<int>>& chords) {
std::string ret("{");
if (!chords.empty()) {
ret += android::base::Join(chords.front(), ' ');
for (auto it = std::next(chords.begin()); it != chords.end(); ++it) {
ret += ',';
ret += android::base::Join(*it, ' ');
}
}
return ret + '}';
}
std::string TestFrame::Format() const {
return Format(keycodes_);
}
} // namespace
TEST(keychords, not_instantiated) {
TestFrame test_frame(empty_chords);
EXPECT_TRUE(InitInotifyFds().size() == 0);
}
TEST(keychords, instantiated) {
// Test if a valid set of chords results in proper instantiation of the
// underlying mechanisms for /dev/input/ attachment.
TestFrame test_frame(chords);
EXPECT_TRUE(InitInotifyFds().size() != 0);
}
TEST(keychords, init_inotify) {
std::string before(InitInputFds());
TestFrame test_frame(chords);
EventHandler ev;
EXPECT_TRUE(ev.init());
for (int retry = 1000; retry && before == InitInputFds(); --retry) test_frame.RelaxForMs();
std::string after(InitInputFds());
EXPECT_NE(before, after);
}
TEST(keychords, key) {
EventHandler ev;
EXPECT_TRUE(ev.init());
TestFrame test_frame(chords, &ev);
test_frame.SetChords(escape_chord);
test_frame.WaitForChord(escape_chord);
test_frame.ClrChords(escape_chord);
EXPECT_TRUE(test_frame.IsOnlyChord(escape_chord))
<< "expected only " << android::base::Join(escape_chord, ' ') << " got "
<< test_frame.Format();
}
TEST(keychords, keys_in_series) {
EventHandler ev;
EXPECT_TRUE(ev.init());
TestFrame test_frame(chords, &ev);
for (auto& key : triple1_chord) {
test_frame.SetChord(key);
test_frame.ClrChord(key);
}
test_frame.WaitForChord(triple1_chord);
EXPECT_TRUE(test_frame.IsNoChord()) << "expected nothing got " << test_frame.Format();
}
TEST(keychords, keys_in_parallel) {
EventHandler ev;
EXPECT_TRUE(ev.init());
TestFrame test_frame(chords, &ev);
test_frame.SetChords(triple2_chord);
test_frame.WaitForChord(triple2_chord);
test_frame.ClrChords(triple2_chord);
EXPECT_TRUE(test_frame.IsOnlyChord(triple2_chord))
<< "expected only " << android::base::Join(triple2_chord, ' ') << " got "
<< test_frame.Format();
}
} // namespace init
} // namespace android