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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/setup/daemon_controller_delegate_linux.h"
#include <unistd.h>
#include "base/base_paths.h"
#include "base/bind.h"
#include "base/command_line.h"
#include "base/compiler_specific.h"
#include "base/environment.h"
#include "base/files/file_path.h"
#include "base/files/file_util.h"
#include "base/json/json_writer.h"
#include "base/logging.h"
#include "base/md5.h"
#include "base/path_service.h"
#include "base/process/launch.h"
#include "base/process/process.h"
#include "base/strings/string_number_conversions.h"
#include "base/strings/string_split.h"
#include "base/strings/string_util.h"
#include "base/thread_task_runner_handle.h"
#include "base/values.h"
#include "build/build_config.h"
#include "net/base/network_interfaces.h"
#include "remoting/host/host_config.h"
#include "remoting/host/usage_stats_consent.h"
namespace remoting {
namespace {
const char kDaemonScript[] =
"/opt/google/chrome-remote-desktop/chrome-remote-desktop";
base::FilePath GetConfigPath() {
std::string filename =
"host#" + base::MD5String(net::GetHostName()) + ".json";
base::FilePath homedir;
PathService::Get(base::DIR_HOME, &homedir);
return homedir.Append(".config/chrome-remote-desktop").Append(filename);
}
bool GetScriptPath(base::FilePath* result) {
base::FilePath candidate_exe(kDaemonScript);
if (access(candidate_exe.value().c_str(), X_OK) == 0) {
*result = candidate_exe;
return true;
}
return false;
}
bool RunHostScript(const std::vector<std::string>& args) {
// As long as we're relying on running an external binary from the
// PATH, don't do it as root.
if (getuid() == 0) {
LOG(ERROR) << "Refusing to run script as root.";
return false;
}
base::FilePath script_path;
if (!GetScriptPath(&script_path)) {
LOG(ERROR) << "GetScriptPath() failed.";
return false;
}
base::CommandLine command_line(script_path);
for (unsigned int i = 0; i < args.size(); ++i) {
command_line.AppendArg(args[i]);
}
std::string output;
bool result = base::GetAppOutputAndError(command_line, &output);
if (result) {
LOG(INFO) << output;
} else {
LOG(ERROR) << output;
}
return result;
}
} // namespace
DaemonControllerDelegateLinux::DaemonControllerDelegateLinux() {
}
DaemonControllerDelegateLinux::~DaemonControllerDelegateLinux() {
}
DaemonController::State DaemonControllerDelegateLinux::GetState() {
base::FilePath script_path;
if (!GetScriptPath(&script_path)) {
LOG(ERROR) << "GetScriptPath() failed.";
return DaemonController::STATE_UNKNOWN;
}
base::CommandLine command_line(script_path);
command_line.AppendArg("--get-status");
std::string status;
int exit_code = 0;
if (!base::GetAppOutputWithExitCode(command_line, &status, &exit_code) ||
exit_code != 0) {
LOG(ERROR) << "Failed to run \"" << command_line.GetCommandLineString()
<< "\". Exit code: " << exit_code;
return DaemonController::STATE_UNKNOWN;
}
base::TrimWhitespaceASCII(status, base::TRIM_ALL, &status);
if (status == "STARTED") {
return DaemonController::STATE_STARTED;
} else if (status == "STOPPED") {
return DaemonController::STATE_STOPPED;
} else if (status == "NOT_IMPLEMENTED") {
// Chrome Remote Desktop is not currently supported on the underlying Linux
// Distro.
return DaemonController::STATE_NOT_IMPLEMENTED;
} else {
LOG(ERROR) << "Unknown status string returned from \""
<< command_line.GetCommandLineString()
<< "\": " << status;
return DaemonController::STATE_UNKNOWN;
}
}
scoped_ptr<base::DictionaryValue> DaemonControllerDelegateLinux::GetConfig() {
scoped_ptr<base::DictionaryValue> config(
HostConfigFromJsonFile(GetConfigPath()));
if (!config)
return nullptr;
scoped_ptr<base::DictionaryValue> result(new base::DictionaryValue());
std::string value;
if (config->GetString(kHostIdConfigPath, &value)) {
result->SetString(kHostIdConfigPath, value);
}
if (config->GetString(kXmppLoginConfigPath, &value)) {
result->SetString(kXmppLoginConfigPath, value);
}
return result;
}
void DaemonControllerDelegateLinux::SetConfigAndStart(
scoped_ptr<base::DictionaryValue> config,
bool consent,
const DaemonController::CompletionCallback& done) {
// Add the user to chrome-remote-desktop group first.
std::vector<std::string> args;
args.push_back("--add-user");
if (!RunHostScript(args)) {
LOG(ERROR) << "Failed to add user to chrome-remote-desktop group.";
done.Run(DaemonController::RESULT_FAILED);
return;
}
// Ensure the configuration directory exists.
base::FilePath config_dir = GetConfigPath().DirName();
if (!base::DirectoryExists(config_dir)) {
base::File::Error error;
if (!base::CreateDirectoryAndGetError(config_dir, &error)) {
LOG(ERROR) << "Failed to create config directory " << config_dir.value()
<< ", error: " << base::File::ErrorToString(error);
done.Run(DaemonController::RESULT_FAILED);
return;
}
}
// Write config.
if (!HostConfigToJsonFile(*config, GetConfigPath())) {
LOG(ERROR) << "Failed to update config file.";
done.Run(DaemonController::RESULT_FAILED);
return;
}
// Finally start the host.
args.clear();
args.push_back("--start");
DaemonController::AsyncResult result = DaemonController::RESULT_FAILED;
if (RunHostScript(args))
result = DaemonController::RESULT_OK;
done.Run(result);
}
void DaemonControllerDelegateLinux::UpdateConfig(
scoped_ptr<base::DictionaryValue> config,
const DaemonController::CompletionCallback& done) {
scoped_ptr<base::DictionaryValue> new_config(
HostConfigFromJsonFile(GetConfigPath()));
if (new_config)
new_config->MergeDictionary(config.get());
if (!new_config || !HostConfigToJsonFile(*new_config, GetConfigPath())) {
LOG(ERROR) << "Failed to update config file.";
done.Run(DaemonController::RESULT_FAILED);
return;
}
std::vector<std::string> args;
args.push_back("--reload");
DaemonController::AsyncResult result = DaemonController::RESULT_FAILED;
if (RunHostScript(args))
result = DaemonController::RESULT_OK;
done.Run(result);
}
void DaemonControllerDelegateLinux::Stop(
const DaemonController::CompletionCallback& done) {
std::vector<std::string> args;
args.push_back("--stop");
DaemonController::AsyncResult result = DaemonController::RESULT_FAILED;
if (RunHostScript(args))
result = DaemonController::RESULT_OK;
done.Run(result);
}
DaemonController::UsageStatsConsent
DaemonControllerDelegateLinux::GetUsageStatsConsent() {
// Crash dump collection is not implemented on Linux yet.
// http://crbug.com/130678.
DaemonController::UsageStatsConsent consent;
consent.supported = false;
consent.allowed = false;
consent.set_by_policy = false;
return consent;
}
scoped_refptr<DaemonController> DaemonController::Create() {
return new DaemonController(
make_scoped_ptr(new DaemonControllerDelegateLinux()));
}
} // namespace remoting
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