blob: 8d46d998c6396b6599a83779dc29f4b3d3914d4d [file] [log] [blame]
// 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 <string>
#include <vector>
#include "base/basictypes.h"
#include "base/compiler_specific.h"
#include "base/environment.h"
#include "base/memory/ref_counted.h"
#include "base/memory/scoped_ptr.h"
#include "base/observer_list.h"
#include "net/base/net_export.h"
#include "net/proxy/proxy_config.h"
#include "net/proxy/proxy_config_service.h"
#include "net/proxy/proxy_server.h"
class MessageLoopForIO;
namespace base {
class SingleThreadTaskRunner;
} // namespace base
namespace net {
// Implementation of ProxyConfigService that retrieves the system proxy
// settings from environment variables, gconf, gsettings, or kioslaverc (KDE).
class NET_EXPORT_PRIVATE ProxyConfigServiceLinux : public ProxyConfigService {
// Forward declaration of Delegate.
class Delegate;
class SettingGetter {
// Buffer size used in some implementations of this class when reading
// files. Defined here so unit tests can construct worst-case inputs.
static const size_t BUFFER_SIZE = 512;
SettingGetter() {}
virtual ~SettingGetter() {}
// Initializes the class: obtains a gconf/gsettings client, or simulates
// one, in the concrete implementations. Returns true on success. Must be
// called before using other methods, and should be called on the thread
// running the glib main loop.
// One of |glib_thread_task_runner| and |file_loop| will be used for
// gconf/gsettings calls or reading necessary files, depending on the
// implementation.
virtual bool Init(base::SingleThreadTaskRunner* glib_thread_task_runner,
MessageLoopForIO* file_loop) = 0;
// Releases the gconf/gsettings client, which clears cached directories and
// stops notifications.
virtual void ShutDown() = 0;
// Requests notification of gconf/gsettings changes for proxy
// settings. Returns true on success.
virtual bool SetUpNotifications(Delegate* delegate) = 0;
// Returns the message loop for the thread on which this object
// handles notifications, and also on which it must be destroyed.
// Returns NULL if it does not matter.
virtual base::SingleThreadTaskRunner* GetNotificationTaskRunner() = 0;
// Returns the source of proxy settings.
virtual ProxyConfigSource GetConfigSource() = 0;
// These are all the values that can be fetched. We used to just use the
// corresponding paths in gconf for these, but gconf is now obsolete and
// in the future we'll be using mostly gsettings/kioslaverc so we
// enumerate them instead to avoid unnecessary string operations.
enum StringSetting {
enum BoolSetting {
enum IntSetting {
enum StringListSetting {
// Given a PROXY_*_HOST value, return the corresponding PROXY_*_PORT value.
static IntSetting HostSettingToPortSetting(StringSetting host) {
switch (host) {
return PROXY_HTTP_PORT; // Placate compiler.
// Gets a string type value from the data source and stores it in
// |*result|. Returns false if the key is unset or on error. Must only be
// called after a successful call to Init(), and not after a failed call
// to SetUpNotifications() or after calling Release().
virtual bool GetString(StringSetting key, std::string* result) = 0;
// Same thing for a bool typed value.
virtual bool GetBool(BoolSetting key, bool* result) = 0;
// Same for an int typed value.
virtual bool GetInt(IntSetting key, int* result) = 0;
// And for a string list.
virtual bool GetStringList(StringListSetting key,
std::vector<std::string>* result) = 0;
// Returns true if the bypass list should be interpreted as a proxy
// whitelist rather than blacklist. (This is KDE-specific.)
virtual bool BypassListIsReversed() = 0;
// Returns true if the bypass rules should be interpreted as
// suffix-matching rules.
virtual bool MatchHostsUsingSuffixMatching() = 0;
// ProxyConfigServiceLinux is created on the UI thread, and
// SetUpAndFetchInitialConfig() is immediately called to synchronously
// fetch the original configuration and set up change notifications on
// the UI thread.
// Past that point, it is accessed periodically through the
// ProxyConfigService interface (GetLatestProxyConfig, AddObserver,
// RemoveObserver) from the IO thread.
// Setting change notification callbacks can occur at any time and are
// run on either the UI thread (gconf/gsettings) or the file thread
// (KDE). The new settings are fetched on that thread, and the resulting
// proxy config is posted to the IO thread through
// Delegate::SetNewProxyConfig(). We then notify observers on the IO
// thread of the configuration change.
// ProxyConfigServiceLinux is deleted from the IO thread.
// The substance of the ProxyConfigServiceLinux implementation is
// wrapped in the Delegate ref counted class. On deleting the
// ProxyConfigServiceLinux, Delegate::OnDestroy() is posted to either
// the UI thread (gconf/gsettings) or the file thread (KDE) where change
// notifications will be safely stopped before releasing Delegate.
class Delegate : public base::RefCountedThreadSafe<Delegate> {
// Constructor receives env var getter implementation to use, and
// takes ownership of it. This is the normal constructor.
explicit Delegate(base::Environment* env_var_getter);
// Constructor receives setting and env var getter implementations
// to use, and takes ownership of them. Used for testing.
Delegate(base::Environment* env_var_getter, SettingGetter* setting_getter);
// Synchronously obtains the proxy configuration. If gconf,
// gsettings, or kioslaverc are used, also enables notifications for
// setting changes. gconf/gsettings must only be accessed from the
// thread running the default glib main loop, and so this method
// must be called from the UI thread. The message loop for the IO
// thread is specified so that notifications can post tasks to it
// (and for assertions). The message loop for the file thread is
// used to read any files needed to determine proxy settings.
void SetUpAndFetchInitialConfig(
base::SingleThreadTaskRunner* glib_thread_task_runner,
base::SingleThreadTaskRunner* io_thread_task_runner,
MessageLoopForIO* file_loop);
// Handler for setting change notifications: fetches a new proxy
// configuration from settings, and if this config is different
// than what we had before, posts a task to have it stored in
// cached_config_.
// Left public for simplicity.
void OnCheckProxyConfigSettings();
// Called from IO thread.
void AddObserver(Observer* observer);
void RemoveObserver(Observer* observer);
ProxyConfigService::ConfigAvailability GetLatestProxyConfig(
ProxyConfig* config);
// Posts a call to OnDestroy() to the UI or FILE thread, depending on the
// setting getter in use. Called from ProxyConfigServiceLinux's destructor.
void PostDestroyTask();
// Safely stops change notifications. Posted to either the UI or FILE
// thread, depending on the setting getter in use.
void OnDestroy();
friend class base::RefCountedThreadSafe<Delegate>;
// Obtains an environment variable's value. Parses a proxy server
// specification from it and puts it in result. Returns true if the
// requested variable is defined and the value valid.
bool GetProxyFromEnvVarForScheme(const char* variable,
ProxyServer::Scheme scheme,
ProxyServer* result_server);
// As above but with scheme set to HTTP, for convenience.
bool GetProxyFromEnvVar(const char* variable, ProxyServer* result_server);
// Fills proxy config from environment variables. Returns true if
// variables were found and the configuration is valid.
bool GetConfigFromEnv(ProxyConfig* config);
// Obtains host and port config settings and parses a proxy server
// specification from it and puts it in result. Returns true if the
// requested variable is defined and the value valid.
bool GetProxyFromSettings(SettingGetter::StringSetting host_key,
ProxyServer* result_server);
// Fills proxy config from settings. Returns true if settings were found
// and the configuration is valid.
bool GetConfigFromSettings(ProxyConfig* config);
// This method is posted from the UI thread to the IO thread to
// carry the new config information.
void SetNewProxyConfig(const ProxyConfig& new_config);
// This method is run on the getter's notification thread.
void SetUpNotifications();
scoped_ptr<base::Environment> env_var_getter_;
scoped_ptr<SettingGetter> setting_getter_;
// Cached proxy configuration, to be returned by
// GetLatestProxyConfig. Initially populated from the UI thread, but
// afterwards only accessed from the IO thread.
ProxyConfig cached_config_;
// A copy kept on the UI thread of the last seen proxy config, so as
// to avoid posting a call to SetNewProxyConfig when we get a
// notification but the config has not actually changed.
ProxyConfig reference_config_;
// The task runner for the glib thread, aka main browser thread. This thread
// is where we run the glib main loop (see base/message_pump_glib.h). It is
// the glib default loop in the sense that it runs the glib default context:
// as in the context where sources are added by g_timeout_add and
// g_idle_add, and returned by g_main_context_default. gconf uses glib
// timeouts and idles and possibly other callbacks that will all be
// dispatched on this thread. Since gconf is not thread safe, any use of
// gconf must be done on the thread running this loop.
scoped_refptr<base::SingleThreadTaskRunner> glib_thread_task_runner_;
// Task runner for the IO thread. GetLatestProxyConfig() is called from
// the thread running this loop.
scoped_refptr<base::SingleThreadTaskRunner> io_thread_task_runner_;
ObserverList<Observer> observers_;
// Thin wrapper shell around Delegate.
// Usual constructor
// For testing: take alternate setting and env var getter implementations.
explicit ProxyConfigServiceLinux(base::Environment* env_var_getter);
ProxyConfigServiceLinux(base::Environment* env_var_getter,
SettingGetter* setting_getter);
virtual ~ProxyConfigServiceLinux();
void SetupAndFetchInitialConfig(
base::SingleThreadTaskRunner* glib_thread_task_runner,
base::SingleThreadTaskRunner* io_thread_task_runner,
MessageLoopForIO* file_loop) {
io_thread_task_runner, file_loop);
void OnCheckProxyConfigSettings() {
// ProxyConfigService methods:
// Called from IO thread.
virtual void AddObserver(Observer* observer) OVERRIDE;
virtual void RemoveObserver(Observer* observer) OVERRIDE;
virtual ProxyConfigService::ConfigAvailability GetLatestProxyConfig(
ProxyConfig* config) OVERRIDE;
scoped_refptr<Delegate> delegate_;
} // namespace net