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// Copyright 2014 The Chromium OS Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#include "chromeos/ui/x_server_runner.h"
#include <fcntl.h>
#include <pwd.h>
#include <signal.h>
#include <sys/stat.h>
#include <sys/types.h>
#include <unistd.h>
#include <base/bind.h>
#include <base/callback.h>
#include <base/files/file_path.h>
#include <base/files/file_util.h>
#include <base/files/scoped_temp_dir.h>
#include <base/macros.h>
#include <base/posix/eintr_wrapper.h>
#include <base/strings/string_number_conversions.h>
#include <base/threading/platform_thread.h>
#include <gtest/gtest.h>
#include "chromeos/ui/util.h"
namespace chromeos {
namespace ui {
namespace {
// Passed to XServerRunner as a callback that should be run instead of actually
// starting the X server. Writes the current process's PID to |pipe_path|. If
// |exit_delay| is non-zero, sleeps and exits without sending SIGUSR1.
// Otherwise, sleeps for |signal_delay|, sends SIGUSR1 to its parent process,
// and then sleeps for a long time.
void ExecServer(const base::FilePath& pipe_path,
const base::TimeDelta& signal_delay,
const base::TimeDelta& exit_delay) {
// Write our PID so the test (our grandparent process) can clean us up.
pid_t pid = getpid();
PCHECK(base::WriteFile(pipe_path, reinterpret_cast<const char*>(&pid),
sizeof(pid)) == sizeof(pid));
// Check that the child process didn't inherit any blocked signals:
// http://crbug.com/380713
sigset_t old_signals;
PCHECK(sigemptyset(&old_signals) == 0);
PCHECK(sigprocmask(SIG_SETMASK, nullptr, &old_signals) == 0);
CHECK(sigisemptyset(&old_signals)) << "Child inherited blocked signals";
if (exit_delay > base::TimeDelta()) {
base::PlatformThread::Sleep(exit_delay);
exit(1);
}
if (signal_delay > base::TimeDelta())
base::PlatformThread::Sleep(signal_delay);
PCHECK(kill(getppid(), SIGUSR1) == 0);
base::PlatformThread::Sleep(base::TimeDelta::FromSeconds(60));
}
} // namespace
class XServerRunnerTest : public testing::Test {
public:
XServerRunnerTest() : server_pid_(0) {
CHECK(temp_dir_.CreateUniqueTempDir());
base_path_ = temp_dir_.path();
runner_.set_base_path_for_testing(base_path_);
xauth_path_ = base_path_.Append("xauth");
}
virtual ~XServerRunnerTest() {}
// Calls StartServer(). See ExecServer() for descriptions of the arguments.
void StartServer(const base::TimeDelta& signal_delay,
const base::TimeDelta& exit_delay) {
// Named pipe used by ExecServer() to pass its PID back to the test process.
base::FilePath pipe_path = base_path_.Append("pipe");
PCHECK(mkfifo(pipe_path.value().c_str(), 0600) == 0);
runner_.set_callback_for_testing(
base::Bind(&ExecServer, pipe_path, signal_delay, exit_delay));
passwd* user_info = getpwuid(getuid());
ASSERT_TRUE(user_info) << "getpwuid() didn't find UID " << getuid();
ASSERT_TRUE(runner_.StartServer(user_info->pw_name, 1, false, xauth_path_));
// Open the pipe and read ExecServer()'s PID.
int pipe_fd = open(pipe_path.value().c_str(), O_RDONLY);
PCHECK(pipe_fd >= 0) << "Failed to open " << pipe_path.value();
PCHECK(HANDLE_EINTR(read(pipe_fd, &server_pid_, sizeof(server_pid_))) ==
sizeof(server_pid_));
close(pipe_fd);
}
// Calls WaitForServer() and returns its result. If it returns true (i.e. the
// X server process sent SIGUSR1), additionally kills the process before
// returning.
bool WaitForServer() {
// No need to kill the process if it already exited on its own.
if (!runner_.WaitForServer())
return false;
LOG(INFO) << "Killing server process " << server_pid_;
kill(server_pid_, SIGTERM);
return true;
}
protected:
base::ScopedTempDir temp_dir_;
base::FilePath base_path_;
base::FilePath xauth_path_;
XServerRunner runner_;
// PID of the process running ExecServer().
pid_t server_pid_;
private:
DISALLOW_COPY_AND_ASSIGN(XServerRunnerTest);
};
TEST_F(XServerRunnerTest, FastSuccess) {
StartServer(base::TimeDelta(), base::TimeDelta());
EXPECT_TRUE(WaitForServer());
}
TEST_F(XServerRunnerTest, SlowSuccess) {
StartServer(base::TimeDelta::FromSeconds(1), base::TimeDelta());
EXPECT_TRUE(WaitForServer());
}
TEST_F(XServerRunnerTest, FastCrash) {
StartServer(base::TimeDelta(), base::TimeDelta::FromMicroseconds(1));
EXPECT_FALSE(WaitForServer());
}
TEST_F(XServerRunnerTest, SlowCrash) {
StartServer(base::TimeDelta(), base::TimeDelta::FromSeconds(1));
EXPECT_FALSE(WaitForServer());
}
TEST_F(XServerRunnerTest, TermServer) {
StartServer(base::TimeDelta::FromSeconds(60), base::TimeDelta());
PCHECK(kill(server_pid_, SIGTERM) == 0);
EXPECT_FALSE(WaitForServer());
}
TEST_F(XServerRunnerTest, StopAndContinueServer) {
// Test that SIGCHLD signals that are sent in response to the process being
// stopped or continued are ignored.
StartServer(base::TimeDelta::FromSeconds(1), base::TimeDelta());
PCHECK(kill(server_pid_, SIGSTOP) == 0);
base::PlatformThread::Sleep(base::TimeDelta::FromMilliseconds(100));
PCHECK(kill(server_pid_, SIGCONT) == 0);
EXPECT_TRUE(WaitForServer());
}
TEST_F(XServerRunnerTest, XauthFile) {
StartServer(base::TimeDelta(), base::TimeDelta());
EXPECT_TRUE(WaitForServer());
std::string data;
ASSERT_TRUE(base::ReadFileToString(xauth_path_, &data));
const char kExpected[] =
"\x01" "\x00"
"\x00" "\x09" "localhost"
"\x00" "\x01" "0"
"\x00" "\x12" "MIT-MAGIC-COOKIE-1"
"\x00" "\x10" /* random 16-byte cookie data goes here */;
const size_t kExpectedSize = arraysize(kExpected) - 1;
const size_t kCookieSize = 16;
ASSERT_EQ(kExpectedSize + kCookieSize, data.size());
EXPECT_EQ(base::HexEncode(kExpected, kExpectedSize),
base::HexEncode(data.data(), kExpectedSize));
}
TEST_F(XServerRunnerTest, CreateDirectories) {
StartServer(base::TimeDelta(), base::TimeDelta());
EXPECT_TRUE(WaitForServer());
EXPECT_TRUE(base::DirectoryExists(util::GetReparentedPath(
XServerRunner::kSocketDir, base_path_)));
EXPECT_TRUE(base::DirectoryExists(util::GetReparentedPath(
XServerRunner::kIceDir, base_path_)));
EXPECT_TRUE(base::DirectoryExists(util::GetReparentedPath(
XServerRunner::kXkbDir, base_path_)));
base::FilePath log_file(util::GetReparentedPath(
XServerRunner::kLogFile, base_path_));
base::FilePath log_dir(log_file.DirName());
EXPECT_TRUE(base::DirectoryExists(log_dir));
// Check that a relative symlink is created in the directory above the one
// where the log file is written.
base::FilePath link;
EXPECT_TRUE(base::ReadSymbolicLink(
log_dir.DirName().Append(log_file.BaseName()), &link));
EXPECT_EQ(log_dir.BaseName().Append(log_file.BaseName()).value(),
link.value());
}
} // namespace ui
} // namespace chromeos
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