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// Copyright 2014 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 "mojo/shell/runner/host/child_process_host.h"
#include <stdint.h>
#include <utility>
#include "base/bind.h"
#include "base/command_line.h"
#include "base/location.h"
#include "base/logging.h"
#include "base/macros.h"
#include "base/message_loop/message_loop.h"
#include "base/process/kill.h"
#include "base/process/launch.h"
#include "base/task_runner.h"
#include "base/thread_task_runner_handle.h"
#include "mojo/edk/embedder/embedder.h"
#include "mojo/public/cpp/bindings/interface_ptr_info.h"
#include "mojo/public/cpp/system/core.h"
#include "mojo/shell/native_runner_delegate.h"
#include "mojo/shell/runner/common/client_util.h"
#include "mojo/shell/runner/common/switches.h"
#if defined(OS_LINUX) && !defined(OS_ANDROID)
#include "sandbox/linux/services/namespace_sandbox.h"
#endif
#if defined(OS_WIN)
#include "base/win/windows_version.h"
#endif
namespace mojo {
namespace shell {
ChildProcessHost::ChildProcessHost(base::TaskRunner* launch_process_runner,
NativeRunnerDelegate* delegate,
bool start_sandboxed,
const Identity& target,
const base::FilePath& app_path)
: launch_process_runner_(launch_process_runner),
delegate_(delegate),
start_sandboxed_(start_sandboxed),
target_(target),
app_path_(app_path),
start_child_process_event_(false, false),
weak_factory_(this) {
}
ChildProcessHost::~ChildProcessHost() {
if (!app_path_.empty()) {
CHECK(!mojo_ipc_channel_)
<< "Destroying ChildProcessHost before calling Join";
}
}
mojom::ShellClientPtr ChildProcessHost::Start(
const Identity& target,
const ProcessReadyCallback& callback,
const base::Closure& quit_closure) {
DCHECK(!child_process_.IsValid());
const base::CommandLine* parent_command_line =
base::CommandLine::ForCurrentProcess();
base::FilePath target_path = parent_command_line->GetProgram();
// |app_path_| can be empty in tests.
if (!app_path_.MatchesExtension(FILE_PATH_LITERAL(".mojo")) &&
!app_path_.empty()) {
target_path = app_path_;
}
scoped_ptr<base::CommandLine> child_command_line(
new base::CommandLine(target_path));
child_command_line->AppendArguments(*parent_command_line, false);
#ifndef NDEBUG
child_command_line->AppendSwitchASCII("n", target.name());
child_command_line->AppendSwitchASCII("u", target.user_id());
#endif
if (target_path != app_path_)
child_command_line->AppendSwitchPath(switches::kChildProcess, app_path_);
if (start_sandboxed_)
child_command_line->AppendSwitch(switches::kEnableSandbox);
mojo_ipc_channel_.reset(new edk::PlatformChannelPair);
mojo_ipc_channel_->PrepareToPassClientHandleToChildProcess(
child_command_line.get(), &handle_passing_info_);
mojom::ShellClientPtr client =
PassShellClientRequestOnCommandLine(child_command_line.get());
launch_process_runner_->PostTaskAndReply(
FROM_HERE,
base::Bind(&ChildProcessHost::DoLaunch, base::Unretained(this),
base::Passed(&child_command_line)),
base::Bind(&ChildProcessHost::DidStart,
weak_factory_.GetWeakPtr(), callback));
return client;
}
void ChildProcessHost::Join() {
if (mojo_ipc_channel_)
start_child_process_event_.Wait();
mojo_ipc_channel_.reset();
if (child_process_.IsValid()) {
int rv = -1;
LOG_IF(ERROR, !child_process_.WaitForExit(&rv))
<< "Failed to wait for child process";
child_process_.Close();
}
}
void ChildProcessHost::DidStart(const ProcessReadyCallback& callback) {
if (child_process_.IsValid()) {
callback.Run(child_process_.Pid());
} else {
LOG(ERROR) << "Failed to start child process";
mojo_ipc_channel_.reset();
}
}
void ChildProcessHost::DoLaunch(
scoped_ptr<base::CommandLine> child_command_line) {
if (delegate_) {
delegate_->AdjustCommandLineArgumentsForTarget(target_,
child_command_line.get());
}
base::LaunchOptions options;
#if defined(OS_WIN)
options.handles_to_inherit = &handle_passing_info_;
#if defined(OFFICIAL_BUILD)
CHECK(false) << "Launching mojo process with inherit_handles is insecure!";
#endif
options.inherit_handles = true;
options.stdin_handle = INVALID_HANDLE_VALUE;
options.stdout_handle = GetStdHandle(STD_OUTPUT_HANDLE);
options.stderr_handle = GetStdHandle(STD_ERROR_HANDLE);
// Always inherit stdout/stderr as a pair.
if (!options.stdout_handle || !options.stdin_handle)
options.stdin_handle = options.stdout_handle = nullptr;
// Pseudo handles are used when stdout and stderr redirect to the console. In
// that case, they're automatically inherited by child processes. See
// https://msdn.microsoft.com/en-us/library/windows/desktop/ms682075.aspx
// Trying to add them to the list of handles to inherit causes CreateProcess
// to fail. When this process is launched from Python
// (i.e. by apptest_runner.py) then a real handle is used. In that case, we do
// want to add it to the list of handles that is inherited.
if (options.stdout_handle &&
GetFileType(options.stdout_handle) != FILE_TYPE_CHAR) {
handle_passing_info_.push_back(options.stdout_handle);
}
if (options.stderr_handle &&
GetFileType(options.stderr_handle) != FILE_TYPE_CHAR &&
options.stdout_handle != options.stderr_handle) {
handle_passing_info_.push_back(options.stderr_handle);
}
#elif defined(OS_POSIX)
handle_passing_info_.push_back(std::make_pair(STDIN_FILENO, STDIN_FILENO));
handle_passing_info_.push_back(std::make_pair(STDOUT_FILENO, STDOUT_FILENO));
handle_passing_info_.push_back(std::make_pair(STDERR_FILENO, STDERR_FILENO));
options.fds_to_remap = &handle_passing_info_;
#endif
DVLOG(2) << "Launching child with command line: "
<< child_command_line->GetCommandLineString();
#if defined(OS_LINUX) && !defined(OS_ANDROID)
if (start_sandboxed_) {
child_process_ =
sandbox::NamespaceSandbox::LaunchProcess(*child_command_line, options);
if (!child_process_.IsValid()) {
LOG(ERROR) << "Starting the process with a sandbox failed. Missing kernel"
<< " support.";
}
} else
#endif
child_process_ = base::LaunchProcess(*child_command_line, options);
if (child_process_.IsValid()) {
if (mojo_ipc_channel_.get()) {
mojo_ipc_channel_->ChildProcessLaunched();
mojo::edk::ChildProcessLaunched(
child_process_.Handle(),
mojo::edk::ScopedPlatformHandle(mojo::edk::PlatformHandle(
mojo_ipc_channel_->PassServerHandle().release().handle)));
}
}
start_child_process_event_.Signal();
}
} // namespace shell
} // namespace mojo
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