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// Copyright 2013 The Chromium 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 "remoting/host/it2me/it2me_native_messaging_host_main.h"
#include <utility>
#include "base/at_exit.h"
#include "base/command_line.h"
#include "base/i18n/icu_util.h"
#include "base/message_loop/message_loop.h"
#include "base/run_loop.h"
#include "build/build_config.h"
#include "remoting/base/auto_thread_task_runner.h"
#include "remoting/base/breakpad.h"
#include "remoting/host/chromoting_host_context.h"
#include "remoting/host/host_exit_codes.h"
#include "remoting/host/it2me/it2me_native_messaging_host.h"
#include "remoting/host/logging.h"
#include "remoting/host/native_messaging/native_messaging_pipe.h"
#include "remoting/host/native_messaging/pipe_messaging_channel.h"
#include "remoting/host/resources.h"
#include "remoting/host/usage_stats_consent.h"
#if defined(OS_LINUX)
#include <gtk/gtk.h>
#include <X11/Xlib.h>
#include "base/linux_util.h"
#endif // defined(OS_LINUX)
#if defined(OS_MACOSX)
#include "base/mac/scoped_nsautorelease_pool.h"
#endif // defined(OS_MACOSX)
#if defined(OS_WIN)
#include <commctrl.h>
#include "remoting/host/switches.h"
#include "remoting/host/win/elevation_helpers.h"
#endif // defined(OS_WIN)
namespace remoting {
// Creates a It2MeNativeMessagingHost instance, attaches it to stdin/stdout and
// runs the message loop until It2MeNativeMessagingHost signals shutdown.
int StartIt2MeNativeMessagingHost() {
#if defined(OS_MACOSX)
// Needed so we don't leak objects when threads are created.
base::mac::ScopedNSAutoreleasePool pool;
#endif // defined(OS_MACOSX)
#if defined(REMOTING_ENABLE_BREAKPAD)
// Initialize Breakpad as early as possible. On Mac the command-line needs to
// be initialized first, so that the preference for crash-reporting can be
// looked up in the config file.
// TODO(nicholss): Commenting out Breakpad. See crbug.com/637884
// if (IsUsageStatsAllowed()) {
// InitializeCrashReporting();
// }
#endif // defined(REMOTING_ENABLE_BREAKPAD)
#if defined(OS_WIN)
// Register and initialize common controls.
INITCOMMONCONTROLSEX info;
info.dwSize = sizeof(info);
info.dwICC = ICC_STANDARD_CLASSES;
InitCommonControlsEx(&info);
#endif // defined(OS_WIN)
// Required to find the ICU data file, used by some file_util routines.
base::i18n::InitializeICU();
remoting::LoadResources("");
#if defined(OS_LINUX)
// Required in order for us to run multiple X11 threads.
XInitThreads();
// Required for any calls into GTK functions, such as the Disconnect and
// Continue windows. Calling with nullptr arguments because we don't have
// any command line arguments for gtk to consume.
gtk_init(nullptr, nullptr);
// Need to prime the host OS version value for linux to prevent IO on the
// network thread. base::GetLinuxDistro() caches the result.
base::GetLinuxDistro();
#endif // OS_LINUX
base::File read_file;
base::File write_file;
bool needs_elevation = false;
#if defined(OS_WIN)
const base::CommandLine* command_line =
base::CommandLine::ForCurrentProcess();
if (command_line->HasSwitch(kElevateSwitchName)) {
#if defined(OFFICIAL_BUILD)
// Unofficial builds won't have 'UiAccess' since it requires signing.
if (!CurrentProcessHasUiAccess()) {
LOG(ERROR) << "UiAccess permission missing from elevated It2Me process.";
}
#endif // defined(OFFICIAL_BUILD)
// The UiAccess binary should always have the "input" and "output" switches
// specified, they represent the name of the named pipes that should be used
// in place of stdin and stdout.
DCHECK(command_line->HasSwitch(kInputSwitchName));
DCHECK(command_line->HasSwitch(kOutputSwitchName));
// presubmit: allow wstring
std::wstring input_pipe_name =
command_line->GetSwitchValueNative(kInputSwitchName);
// presubmit: allow wstring
std::wstring output_pipe_name =
command_line->GetSwitchValueNative(kOutputSwitchName);
// A NULL SECURITY_ATTRIBUTES signifies that the handle can't be inherited.
read_file =
base::File(CreateFile(input_pipe_name.c_str(), GENERIC_READ, 0, nullptr,
OPEN_EXISTING, FILE_ATTRIBUTE_NORMAL, nullptr));
if (!read_file.IsValid()) {
PLOG(ERROR) << "CreateFile failed on '" << input_pipe_name << "'";
return kInitializationFailed;
}
write_file = base::File(CreateFile(output_pipe_name.c_str(), GENERIC_WRITE,
0, nullptr, OPEN_EXISTING,
FILE_ATTRIBUTE_NORMAL, nullptr));
if (!write_file.IsValid()) {
PLOG(ERROR) << "CreateFile failed on '" << output_pipe_name << "'";
return kInitializationFailed;
}
} else {
needs_elevation = true;
// GetStdHandle() returns pseudo-handles for stdin and stdout even if
// the hosting executable specifies "Windows" subsystem. However the
// returned handles are invalid in that case unless standard input and
// output are redirected to a pipe or file.
read_file = base::File(GetStdHandle(STD_INPUT_HANDLE));
write_file = base::File(GetStdHandle(STD_OUTPUT_HANDLE));
// After the native messaging channel starts the native messaging reader
// will keep doing blocking read operations on the input named pipe.
// If any other thread tries to perform any operation on STDIN, it will also
// block because the input named pipe is synchronous (non-overlapped).
// It is pretty common for a DLL to query the device info (GetFileType) of
// the STD* handles at startup. So any LoadLibrary request can potentially
// be blocked. To prevent that from happening we close STDIN and STDOUT
// handles as soon as we retrieve the corresponding file handles.
SetStdHandle(STD_INPUT_HANDLE, nullptr);
SetStdHandle(STD_OUTPUT_HANDLE, nullptr);
}
#elif defined(OS_POSIX)
// The files are automatically closed.
read_file = base::File(STDIN_FILENO);
write_file = base::File(STDOUT_FILENO);
#else
#error Not implemented.
#endif
base::MessageLoopForUI message_loop;
base::RunLoop run_loop;
std::unique_ptr<It2MeHostFactory> factory(new It2MeHostFactory());
std::unique_ptr<NativeMessagingPipe> native_messaging_pipe(
new NativeMessagingPipe());
// Set up the native messaging channel.
std::unique_ptr<extensions::NativeMessagingChannel> channel(
new PipeMessagingChannel(std::move(read_file), std::move(write_file)));
std::unique_ptr<ChromotingHostContext> context =
ChromotingHostContext::Create(new remoting::AutoThreadTaskRunner(
message_loop.task_runner(), run_loop.QuitClosure()));
std::unique_ptr<extensions::NativeMessageHost> host(
new It2MeNativeMessagingHost(needs_elevation, /*policy_service=*/nullptr,
std::move(context), std::move(factory)));
host->Start(native_messaging_pipe.get());
native_messaging_pipe->Start(std::move(host), std::move(channel));
// Run the loop until channel is alive.
run_loop.Run();
return kSuccessExitCode;
}
int It2MeNativeMessagingHostMain(int argc, char** argv) {
// This object instance is required by Chrome code (such as MessageLoop).
base::AtExitManager exit_manager;
base::CommandLine::Init(argc, argv);
remoting::InitHostLogging();
return StartIt2MeNativeMessagingHost();
}
} // namespace remoting
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