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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/runner/child_process_host.h"
#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/task_runner_util.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/runner/context.h"
#include "mojo/runner/switches.h"
#include "mojo/runner/task_runners.h"
#if defined(OS_LINUX) && !defined(OS_ANDROID)
#include "sandbox/linux/services/namespace_sandbox.h"
#endif
namespace mojo {
namespace runner {
ChildProcessHost::ChildProcessHost(Context* context,
bool start_sandboxed,
const base::FilePath& app_path)
: context_(context),
start_sandboxed_(start_sandboxed),
app_path_(app_path),
channel_info_(nullptr) {
platform_channel_ = platform_channel_pair_.PassServerHandle();
CHECK(platform_channel_.is_valid());
}
ChildProcessHost::~ChildProcessHost() {
if (child_process_.IsValid()) {
LOG(WARNING) << "Destroying ChildProcessHost with unjoined child";
child_process_.Close();
}
}
void ChildProcessHost::Start() {
DCHECK(!child_process_.IsValid());
DCHECK(platform_channel_.is_valid());
ScopedMessagePipeHandle handle(embedder::CreateChannel(
platform_channel_.Pass(),
base::Bind(&ChildProcessHost::DidCreateChannel, base::Unretained(this)),
base::ThreadTaskRunnerHandle::Get()));
controller_.Bind(InterfacePtrInfo<ChildController>(handle.Pass(), 0u));
CHECK(base::PostTaskAndReplyWithResult(
context_->task_runners()->blocking_pool(), FROM_HERE,
base::Bind(&ChildProcessHost::DoLaunch, base::Unretained(this)),
base::Bind(&ChildProcessHost::DidStart, base::Unretained(this))));
}
int ChildProcessHost::Join() {
DCHECK(child_process_.IsValid());
int rv = -1;
LOG_IF(ERROR, !child_process_.WaitForExit(&rv))
<< "Failed to wait for child process";
child_process_.Close();
return rv;
}
void ChildProcessHost::StartApp(
InterfaceRequest<Application> application_request,
const ChildController::StartAppCallback& on_app_complete) {
DCHECK(controller_);
on_app_complete_ = on_app_complete;
controller_->StartApp(
application_request.Pass(),
base::Bind(&ChildProcessHost::AppCompleted, base::Unretained(this)));
}
void ChildProcessHost::ExitNow(int32_t exit_code) {
DCHECK(controller_);
controller_->ExitNow(exit_code);
}
void ChildProcessHost::DidStart(bool success) {
DVLOG(2) << "ChildProcessHost::DidStart()";
if (!success) {
LOG(ERROR) << "Failed to start child process";
AppCompleted(MOJO_RESULT_UNKNOWN);
return;
}
}
bool ChildProcessHost::DoLaunch() {
const base::CommandLine* parent_command_line =
base::CommandLine::ForCurrentProcess();
base::CommandLine child_command_line(parent_command_line->GetProgram());
child_command_line.AppendArguments(*parent_command_line, false);
child_command_line.AppendSwitchPath(switches::kChildProcess, app_path_);
if (start_sandboxed_)
child_command_line.AppendSwitch(switches::kEnableSandbox);
embedder::HandlePassingInformation handle_passing_info;
platform_channel_pair_.PrepareToPassClientHandleToChildProcess(
&child_command_line, &handle_passing_info);
base::LaunchOptions options;
#if defined(OS_WIN)
options.handles_to_inherit = &handle_passing_info;
#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.";
return false;
}
} else
#endif
child_process_ = base::LaunchProcess(child_command_line, options);
if (!child_process_.IsValid())
return false;
platform_channel_pair_.ChildProcessLaunched();
return true;
}
void ChildProcessHost::AppCompleted(int32_t result) {
if (!on_app_complete_.is_null()) {
auto on_app_complete = on_app_complete_;
on_app_complete_.reset();
on_app_complete.Run(result);
}
}
void ChildProcessHost::DidCreateChannel(embedder::ChannelInfo* channel_info) {
DVLOG(2) << "AppChildProcessHost::DidCreateChannel()";
CHECK(channel_info);
channel_info_ = channel_info;
}
} // namespace runner
} // namespace mojo
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