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// Copyright (c) 2012 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 "content/browser/utility_process_host_impl.h"
#include "base/bind.h"
#include "base/bind_helpers.h"
#include "base/command_line.h"
#include "base/lazy_instance.h"
#include "base/message_loop/message_loop.h"
#include "base/run_loop.h"
#include "base/sequenced_task_runner.h"
#include "base/strings/utf_string_conversions.h"
#include "base/synchronization/lock.h"
#include "base/synchronization/waitable_event.h"
#include "content/browser/browser_child_process_host_impl.h"
#include "content/browser/renderer_host/render_process_host_impl.h"
#include "content/common/child_process_host_impl.h"
#include "content/common/utility_messages.h"
#include "content/public/browser/browser_thread.h"
#include "content/public/browser/content_browser_client.h"
#include "content/public/browser/utility_process_host_client.h"
#include "content/public/common/content_switches.h"
#include "content/public/common/process_type.h"
#include "ipc/ipc_switches.h"
#include "ui/base/ui_base_switches.h"
#if defined(OS_WIN)
#include "content/public/common/sandboxed_process_launcher_delegate.h"
#endif
namespace content {
#if defined(OS_WIN)
// NOTE: changes to this class need to be reviewed by the security team.
class UtilitySandboxedProcessLauncherDelegate
: public SandboxedProcessLauncherDelegate {
public:
explicit UtilitySandboxedProcessLauncherDelegate(
const base::FilePath& exposed_dir) : exposed_dir_(exposed_dir) {}
virtual ~UtilitySandboxedProcessLauncherDelegate() {}
virtual void PreSandbox(bool* disable_default_policy,
base::FilePath* exposed_dir) OVERRIDE {
*exposed_dir = exposed_dir_;
}
private:
base::FilePath exposed_dir_;
};
#endif
UtilityMainThreadFactoryFunction g_utility_main_thread_factory = NULL;
UtilityProcessHost* UtilityProcessHost::Create(
UtilityProcessHostClient* client,
base::SequencedTaskRunner* client_task_runner) {
return new UtilityProcessHostImpl(client, client_task_runner);
}
void UtilityProcessHost::RegisterUtilityMainThreadFactory(
UtilityMainThreadFactoryFunction create) {
g_utility_main_thread_factory = create;
}
UtilityProcessHostImpl::UtilityProcessHostImpl(
UtilityProcessHostClient* client,
base::SequencedTaskRunner* client_task_runner)
: client_(client),
client_task_runner_(client_task_runner),
is_batch_mode_(false),
is_mdns_enabled_(false),
no_sandbox_(false),
#if defined(OS_LINUX)
child_flags_(ChildProcessHost::CHILD_ALLOW_SELF),
#else
child_flags_(ChildProcessHost::CHILD_NORMAL),
#endif
started_(false) {
}
UtilityProcessHostImpl::~UtilityProcessHostImpl() {
DCHECK(BrowserThread::CurrentlyOn(BrowserThread::IO));
if (is_batch_mode_)
EndBatchMode();
}
bool UtilityProcessHostImpl::Send(IPC::Message* message) {
if (!StartProcess())
return false;
return process_->Send(message);
}
bool UtilityProcessHostImpl::StartBatchMode() {
CHECK(!is_batch_mode_);
is_batch_mode_ = StartProcess();
Send(new UtilityMsg_BatchMode_Started());
return is_batch_mode_;
}
void UtilityProcessHostImpl::EndBatchMode() {
CHECK(is_batch_mode_);
is_batch_mode_ = false;
Send(new UtilityMsg_BatchMode_Finished());
}
void UtilityProcessHostImpl::SetExposedDir(const base::FilePath& dir) {
exposed_dir_ = dir;
}
void UtilityProcessHostImpl::EnableMDns() {
is_mdns_enabled_ = true;
}
void UtilityProcessHostImpl::DisableSandbox() {
no_sandbox_ = true;
}
const ChildProcessData& UtilityProcessHostImpl::GetData() {
return process_->GetData();
}
#if defined(OS_POSIX)
void UtilityProcessHostImpl::SetEnv(const base::EnvironmentMap& env) {
env_ = env;
}
#endif // OS_POSIX
bool UtilityProcessHostImpl::StartProcess() {
if (started_)
return true;
started_ = true;
if (is_batch_mode_)
return true;
// Name must be set or metrics_service will crash in any test which
// launches a UtilityProcessHost.
process_.reset(new BrowserChildProcessHostImpl(PROCESS_TYPE_UTILITY, this));
process_->SetName(ASCIIToUTF16("utility process"));
std::string channel_id = process_->GetHost()->CreateChannel();
if (channel_id.empty())
return false;
if (RenderProcessHost::run_renderer_in_process()) {
DCHECK(g_utility_main_thread_factory);
// See comment in RenderProcessHostImpl::Init() for the background on why we
// support single process mode this way.
in_process_thread_.reset(g_utility_main_thread_factory(channel_id));
in_process_thread_->Start();
} else {
const CommandLine& browser_command_line = *CommandLine::ForCurrentProcess();
int child_flags = child_flags_;
#if defined(OS_POSIX)
bool has_cmd_prefix = browser_command_line.HasSwitch(
switches::kUtilityCmdPrefix);
// When running under gdb, forking /proc/self/exe ends up forking the gdb
// executable instead of Chromium. It is almost safe to assume that no
// updates will happen while a developer is running with
// |switches::kUtilityCmdPrefix|. See ChildProcessHost::GetChildPath() for
// a similar case with Valgrind.
if (has_cmd_prefix)
child_flags = ChildProcessHost::CHILD_NORMAL;
#endif
base::FilePath exe_path = ChildProcessHost::GetChildPath(child_flags);
if (exe_path.empty()) {
NOTREACHED() << "Unable to get utility process binary name.";
return false;
}
CommandLine* cmd_line = new CommandLine(exe_path);
cmd_line->AppendSwitchASCII(switches::kProcessType,
switches::kUtilityProcess);
cmd_line->AppendSwitchASCII(switches::kProcessChannelID, channel_id);
std::string locale = GetContentClient()->browser()->GetApplicationLocale();
cmd_line->AppendSwitchASCII(switches::kLang, locale);
if (no_sandbox_ || browser_command_line.HasSwitch(switches::kNoSandbox))
cmd_line->AppendSwitch(switches::kNoSandbox);
#if defined(OS_MACOSX)
if (browser_command_line.HasSwitch(switches::kEnableSandboxLogging))
cmd_line->AppendSwitch(switches::kEnableSandboxLogging);
#endif
if (browser_command_line.HasSwitch(switches::kDebugPluginLoading))
cmd_line->AppendSwitch(switches::kDebugPluginLoading);
#if defined(OS_POSIX)
if (has_cmd_prefix) {
// Launch the utility child process with some prefix
// (usually "xterm -e gdb --args").
cmd_line->PrependWrapper(browser_command_line.GetSwitchValueNative(
switches::kUtilityCmdPrefix));
}
if (!exposed_dir_.empty()) {
cmd_line->AppendSwitchPath(switches::kUtilityProcessAllowedDir,
exposed_dir_);
}
#endif
if (is_mdns_enabled_)
cmd_line->AppendSwitch(switches::kUtilityProcessEnableMDns);
bool use_zygote = false;
#if defined(OS_LINUX)
// The Linux sandbox does not support granting access to a single directory,
// so we need to bypass the zygote in that case.
use_zygote = !no_sandbox_ && exposed_dir_.empty();
#endif
process_->Launch(
#if defined(OS_WIN)
new UtilitySandboxedProcessLauncherDelegate(exposed_dir_),
#elif defined(OS_POSIX)
use_zygote,
env_,
#endif
cmd_line);
}
return true;
}
bool UtilityProcessHostImpl::OnMessageReceived(const IPC::Message& message) {
client_task_runner_->PostTask(
FROM_HERE,
base::Bind(base::IgnoreResult(
&UtilityProcessHostClient::OnMessageReceived), client_.get(),
message));
return true;
}
void UtilityProcessHostImpl::OnProcessCrashed(int exit_code) {
client_task_runner_->PostTask(
FROM_HERE,
base::Bind(&UtilityProcessHostClient::OnProcessCrashed, client_.get(),
exit_code));
}
} // namespace content
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