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// Copyright (c) 2011 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/chromeos/web_socket_proxy_controller.h"
#include <algorithm>
#include <netinet/in.h>
#include <sys/wait.h>
#include <unistd.h>
#include "base/command_line.h"
#include "base/lazy_instance.h"
#include "base/message_loop.h"
#include "base/string_tokenizer.h"
#include "base/threading/thread.h"
#include "chrome/browser/browser_process.h"
#include "chrome/browser/chromeos/web_socket_proxy.h"
#include "chrome/common/chrome_notification_types.h"
#include "chrome/common/chrome_switches.h"
#include "chrome/common/extensions/extension.h"
#include "chrome/common/url_constants.h"
#include "content/public/browser/browser_thread.h"
#include "content/public/browser/notification_observer.h"
#include "content/public/browser/notification_registrar.h"
#include "content/public/browser/notification_service.h"
#include "content/public/common/url_constants.h"
#include "googleurl/src/gurl.h"
#include "net/base/network_change_notifier.h"
using content::BrowserThread;
namespace {
const char* kAllowedIds[] = {
"haiffjcadagjlijoggckpgfnoeiflnem",
"gnedhmakppccajfpfiihfcdlnpgomkcf",
"fjcibdnjlbfnbfdjneajpipnlcppleek",
"okddffdblfhhnmhodogpojmfkjmhinfp"
};
class OriginValidator {
public:
OriginValidator() {
chromeos::FillWithExtensionsIdsWithPrivateAccess(&allowed_ids_);
CommandLine* command_line = CommandLine::ForCurrentProcess();
DCHECK(command_line);
std::string allowed_list =
command_line->GetSwitchValueASCII(switches::kAllowWebSocketProxy);
if (!allowed_list.empty()) {
StringTokenizer t(allowed_list, ",");
while (t.GetNext()) {
// It must be either extension id or origin.
if (Extension::IdIsValid(t.token())) {
allowed_ids_.push_back(t.token());
} else {
// It is not extension id, check if it is an origin.
GURL origin = GURL(t.token()).GetOrigin();
if (!origin.is_valid()) {
LOG(ERROR) << "Invalid extension id or origin specified via "
<< switches::kAllowWebSocketProxy << " switch";
break;
}
allowed_origins_.push_back(origin.spec());
if (origin.SchemeIs(chrome::kExtensionScheme))
allowed_ids_.push_back(origin.host());
}
}
}
for (size_t i = 0; i < allowed_ids_.size(); ++i) {
allowed_origins_.push_back(Extension::GetBaseURLFromExtensionId(
allowed_ids_[i]).GetOrigin().spec());
}
std::sort(allowed_ids_.begin(), allowed_ids_.end());
allowed_ids_.resize(std::unique(
allowed_ids_.begin(), allowed_ids_.end()) - allowed_ids_.begin());
std::sort(allowed_origins_.begin(), allowed_origins_.end());
allowed_origins_.resize(std::unique(allowed_origins_.begin(),
allowed_origins_.end()) - allowed_origins_.begin());
}
bool CheckCredentials(
const std::string& extension_id,
const std::string& hostname,
unsigned short port,
chromeos::WebSocketProxyController::ConnectionFlags flags) {
return std::binary_search(
allowed_ids_.begin(), allowed_ids_.end(), extension_id);
}
const std::vector<std::string>& allowed_origins() { return allowed_origins_; }
private:
std::vector<std::string> allowed_ids_;
std::vector<std::string> allowed_origins_;
};
base::LazyInstance<OriginValidator> g_validator(base::LINKER_INITIALIZED);
class ProxyTask : public Task {
virtual void Run() OVERRIDE;
};
class ProxyLifetime
: public net::NetworkChangeNotifier::OnlineStateObserver,
public content::NotificationObserver {
public:
ProxyLifetime() : delay_ms_(1000), port_(-1), shutdown_requested_(false) {
DLOG(INFO) << "WebSocketProxyController initiation";
BrowserThread::PostTask(
BrowserThread::WEB_SOCKET_PROXY, FROM_HERE, new ProxyTask());
net::NetworkChangeNotifier::AddOnlineStateObserver(this);
registrar_.Add(
this, chrome::NOTIFICATION_WEB_SOCKET_PROXY_STARTED,
content::NotificationService::AllSources());
}
virtual ~ProxyLifetime() {
net::NetworkChangeNotifier::RemoveOnlineStateObserver(this);
}
virtual void Observe(int type, const content::NotificationSource& source,
const content::NotificationDetails& details) OVERRIDE {
base::AutoLock alk(lock_);
port_ = *content::Details<int>(details).ptr();
}
int GetPort() {
base::AutoLock alk(lock_);
return port_;
}
private:
// net::NetworkChangeNotifier::OnlineStateObserver overrides.
virtual void OnOnlineStateChanged(bool online) OVERRIDE {
DCHECK(chromeos::WebSocketProxyController::IsInitiated());
base::AutoLock alk(lock_);
if (server_)
server_->OnNetworkChange();
}
// Delay between next attempt to run proxy.
int volatile delay_ms_;
// Proxy listens for incoming websocket connections on this port.
int volatile port_;
chromeos::WebSocketProxy* volatile server_;
volatile bool shutdown_requested_;
base::Lock lock_;
content::NotificationRegistrar registrar_;
friend class ProxyTask;
friend class chromeos::WebSocketProxyController;
};
base::LazyInstance<ProxyLifetime> g_proxy_lifetime(base::LINKER_INITIALIZED);
void ProxyTask::Run() {
LOG(INFO) << "Attempt to run web socket proxy task";
chromeos::WebSocketProxy* server = new chromeos::WebSocketProxy(
g_validator.Get().allowed_origins());
{
base::AutoLock alk(g_proxy_lifetime.Get().lock_);
if (g_proxy_lifetime.Get().shutdown_requested_)
return;
delete g_proxy_lifetime.Get().server_;
g_proxy_lifetime.Get().server_ = server;
}
server->Run();
{
base::AutoLock alk(g_proxy_lifetime.Get().lock_);
delete server;
g_proxy_lifetime.Get().server_ = NULL;
if (!g_proxy_lifetime.Get().shutdown_requested_) {
// Proxy terminated unexpectedly or failed to start (it can happen due to
// a network problem). Keep trying.
if (g_proxy_lifetime.Get().delay_ms_ < 100 * 1000)
(g_proxy_lifetime.Get().delay_ms_ *= 3) /= 2;
BrowserThread::PostDelayedTask(
BrowserThread::WEB_SOCKET_PROXY, FROM_HERE, new ProxyTask(),
g_proxy_lifetime.Get().delay_ms_);
}
}
}
} // namespace
namespace chromeos {
void FillWithExtensionsIdsWithPrivateAccess(std::vector<std::string>* ids) {
ids->clear();
for (size_t i = 0; i < arraysize(kAllowedIds); ++i)
ids->push_back(kAllowedIds[i]);
}
// static
void WebSocketProxyController::Initiate() {
g_proxy_lifetime.Get();
}
// static
bool WebSocketProxyController::IsInitiated() {
return !(g_proxy_lifetime == NULL);
}
// static
int WebSocketProxyController::GetPort() {
int port = g_proxy_lifetime.Get().GetPort();
DCHECK(IsInitiated());
return port;
}
// static
void WebSocketProxyController::Shutdown() {
if (IsInitiated()) {
DLOG(INFO) << "WebSocketProxyController shutdown";
base::AutoLock alk(g_proxy_lifetime.Get().lock_);
g_proxy_lifetime.Get().shutdown_requested_ = true;
if (g_proxy_lifetime.Get().server_)
g_proxy_lifetime.Get().server_->Shutdown();
}
}
// static
bool WebSocketProxyController::CheckCredentials(
const std::string& extension_id,
const std::string& hostname,
unsigned short port,
ConnectionFlags flags) {
return g_validator.Get().CheckCredentials(
extension_id, hostname, port, flags);
}
} // namespace chromeos
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