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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 "chrome/browser/extensions/api/messaging/native_message_process_host.h"
#include "base/command_line.h"
#include "base/file_path.h"
#include "base/logging.h"
#include "base/path_service.h"
#include "base/pickle.h"
#include "base/process_util.h"
#include "base/values.h"
#include "chrome/browser/extensions/api/messaging/native_process_launcher.h"
#include "chrome/common/chrome_paths.h"
#include "chrome/common/chrome_switches.h"
#include "chrome/common/chrome_version_info.h"
#include "chrome/common/extensions/features/feature.h"
#include "content/public/common/result_codes.h"
namespace {
const int kExitTimeoutMS = 5000;
const uint32 kMaxMessageDataLength = 10 * 1024 * 1024;
const char kNativeHostsDirectoryName[] = "Native Hosts";
} // namespace
namespace extensions {
NativeMessageProcessHost::NativeMessageProcessHost(
base::WeakPtr<Client> weak_client_ui,
int destination_port,
base::ProcessHandle native_process_handle,
FileHandle read_file,
FileHandle write_file,
bool is_send_message)
: weak_client_ui_(weak_client_ui),
destination_port_(destination_port),
native_process_handle_(native_process_handle),
read_file_(read_file),
write_file_(write_file),
scoped_read_file_(&read_file_),
scoped_write_file_(&write_file_),
is_send_message_(is_send_message) {
DCHECK(content::BrowserThread::CurrentlyOn(content::BrowserThread::FILE));
InitIO();
}
NativeMessageProcessHost::~NativeMessageProcessHost() {
DCHECK(content::BrowserThread::CurrentlyOn(content::BrowserThread::FILE));
// Give the process some time to shutdown, then try and kill it.
content::BrowserThread::PostDelayedTask(
content::BrowserThread::FILE,
FROM_HERE,
base::Bind(base::IgnoreResult(&base::KillProcess),
native_process_handle_,
content::RESULT_CODE_NORMAL_EXIT,
false /* don't wait for exit */),
base::TimeDelta::FromMilliseconds(kExitTimeoutMS));
}
// static
void NativeMessageProcessHost::Create(base::WeakPtr<Client> weak_client_ui,
const std::string& native_app_name,
const std::string& connection_message,
int destination_port,
MessageType type,
CreateCallback callback) {
NativeProcessLauncher launcher;
CreateWithLauncher(weak_client_ui, native_app_name, connection_message,
destination_port, type, callback, launcher);
}
// static
void NativeMessageProcessHost::CreateWithLauncher(
base::WeakPtr<Client> weak_client_ui,
const std::string& native_app_name,
const std::string& connection_message,
int destination_port,
MessageType type,
CreateCallback callback,
const NativeProcessLauncher& launcher) {
DCHECK(content::BrowserThread::CurrentlyOn(content::BrowserThread::FILE));
DCHECK(type == TYPE_SEND_MESSAGE_REQUEST || type == TYPE_CONNECT);
ScopedHost process;
if (Feature::GetCurrentChannel() > chrome::VersionInfo::CHANNEL_DEV ||
!CommandLine::ForCurrentProcess()->HasSwitch(
switches::kEnableNativeMessaging)) {
content::BrowserThread::PostTask(content::BrowserThread::UI, FROM_HERE,
base::Bind(callback,
base::Passed(&process)));
return;
}
FilePath native_host_program;
FilePath native_host_registry;
CHECK(PathService::Get(chrome::DIR_USER_DATA, &native_host_registry));
native_host_registry =
native_host_registry.AppendASCII(kNativeHostsDirectoryName);
native_host_program = native_host_registry.AppendASCII(native_app_name);
// Make sure that the client is not trying to invoke something outside of the
// proper directory. Eg. '../../dangerous_something.exe'.
if (!file_util::ContainsPath(native_host_registry, native_host_program)) {
LOG(ERROR) << "Could not find native host: " << native_app_name;
content::BrowserThread::PostTask(content::BrowserThread::UI, FROM_HERE,
base::Bind(callback,
base::Passed(&process)));
return;
}
FileHandle read_handle;
FileHandle write_handle;
base::ProcessHandle native_process_handle;
if (!launcher.LaunchNativeProcess(native_host_program,
&native_process_handle,
&read_handle,
&write_handle)) {
content::BrowserThread::PostTask(content::BrowserThread::UI, FROM_HERE,
base::Bind(callback,
base::Passed(&process)));
return;
}
process.reset(new NativeMessageProcessHost(
weak_client_ui, destination_port, native_process_handle, read_handle,
write_handle, type == TYPE_SEND_MESSAGE_REQUEST));
process->SendImpl(type, connection_message);
content::BrowserThread::PostTask(
content::BrowserThread::UI, FROM_HERE,
base::Bind(callback, base::Passed(&process)));
}
void NativeMessageProcessHost::SendImpl(MessageType type,
const std::string& json) {
DCHECK(content::BrowserThread::CurrentlyOn(content::BrowserThread::FILE));
// Make sure that the process has not died.
if (base::GetTerminationStatus(native_process_handle_, NULL) !=
base::TERMINATION_STATUS_STILL_RUNNING) {
// Notify the message service that the channel should close.
content::BrowserThread::PostTask(content::BrowserThread::UI, FROM_HERE,
base::Bind(&Client::CloseChannel, weak_client_ui_,
destination_port_, true));
}
WriteMessage(type, json);
}
bool NativeMessageProcessHost::WriteMessage(MessageType type,
const std::string& message) {
Pickle pickle;
// Pickles will always pad bytes to 32-bit alignment, so just use a unit32.
pickle.WriteUInt32(type);
// Pickles write the length of a string before it as a uint32.
pickle.WriteString(message);
// Make sure that the pickle doesn't do any unexpected padding.
CHECK(8 + message.length() == pickle.payload_size());
if (!WriteData(write_file_, const_cast<const Pickle*>(&pickle)->payload(),
pickle.payload_size())) {
LOG(ERROR) << "Error writing message to the native client.";
return false;
}
return true;
}
bool NativeMessageProcessHost::ReadMessage(MessageType* type,
std::string* message) {
// Read the type (uint32) and length (uint32).
char message_meta_data[8];
if (!ReadData(read_file_, message_meta_data, 8)) {
LOG(ERROR) << "Error reading the message type and length.";
return false;
}
Pickle pickle;
pickle.WriteBytes(message_meta_data, 8);
PickleIterator pickle_it(pickle);
uint32 uint_type;
uint32 data_length;
if (!pickle_it.ReadUInt32(&uint_type) ||
!pickle_it.ReadUInt32(&data_length)) {
LOG(ERROR) << "Error getting the message type and length from the pickle.";
return false;
}
if (uint_type >= NUM_MESSAGE_TYPES) {
LOG(ERROR) << type << " is not a valid message type.";
return false;
}
if ((is_send_message_ && (uint_type != TYPE_SEND_MESSAGE_RESPONSE)) ||
(!is_send_message_ && (uint_type != TYPE_CONNECT_MESSAGE))) {
LOG(ERROR) << "Recieved a message of type " << uint_type << ". "
<< "Expecting a message of type "
<< (is_send_message_ ? TYPE_SEND_MESSAGE_RESPONSE :
TYPE_CONNECT_MESSAGE);
return false;
}
*type = static_cast<MessageType>(uint_type);
if (data_length > kMaxMessageDataLength) {
LOG(ERROR) << data_length << " is too large for the length of a message. "
<< "Max message size is " << kMaxMessageDataLength;
return false;
}
message->resize(data_length, '\0');
if (!ReadData(read_file_, &(*message)[0], data_length)) {
LOG(ERROR) << "Error reading the json data.";
return false;
}
return true;
}
} // namespace extensions
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