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proxy_config_service_linux.cc
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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 "net/proxy_resolution/proxy_config_service_linux.h"
#include <errno.h>
#include <limits.h>
#include <sys/inotify.h>
#include <unistd.h>
#include <map>
#include <utility>
#include "base/bind.h"
#include "base/files/file_descriptor_watcher_posix.h"
#include "base/files/file_path.h"
#include "base/files/file_util.h"
#include "base/files/scoped_file.h"
#include "base/logging.h"
#include "base/macros.h"
#include "base/memory/ptr_util.h"
#include "base/nix/xdg_util.h"
#include "base/sequenced_task_runner.h"
#include "base/single_thread_task_runner.h"
#include "base/strings/string_number_conversions.h"
#include "base/strings/string_tokenizer.h"
#include "base/strings/string_util.h"
#include "base/task/post_task.h"
#include "base/task/task_traits.h"
#include "base/threading/thread_restrictions.h"
#include "base/timer/timer.h"
#include "net/base/proxy_server.h"
#if defined(USE_GIO)
#include <gio/gio.h>
#endif // defined(USE_GIO)
namespace net {
namespace {
// This turns all rules with a hostname into wildcard matches, which will
// match not just the indicated hostname but also any hostname that ends with
// it.
void RewriteRulesForSuffixMatching(ProxyBypassRules* out) {
// Prepend a wildcard (*) to any hostname based rules, provided it isn't an IP
// address.
for (size_t i = 0; i < out->rules().size(); ++i) {
if (!out->rules()[i]->IsHostnamePatternRule())
continue;
const SchemeHostPortMatcherHostnamePatternRule* prev_rule =
static_cast<const SchemeHostPortMatcherHostnamePatternRule*>(
out->rules()[i].get());
out->ReplaceRule(i, prev_rule->GenerateSuffixMatchingRule());
}
}
// Given a proxy hostname from a setting, returns that hostname with
// an appropriate proxy server scheme prefix.
// scheme indicates the desired proxy scheme: usually http, with
// socks 4 or 5 as special cases.
// TODO(arindam): Remove URI string manipulation by using MapUrlSchemeToProxy.
std::string FixupProxyHostScheme(ProxyServer::Scheme scheme,
std::string host) {
if (scheme == ProxyServer::SCHEME_SOCKS5 &&
base::StartsWith(host, "socks4://",
base::CompareCase::INSENSITIVE_ASCII)) {
// We default to socks 5, but if the user specifically set it to
// socks4://, then use that.
scheme = ProxyServer::SCHEME_SOCKS4;
}
// Strip the scheme if any.
std::string::size_type colon = host.find("://");
if (colon != std::string::npos)
host = host.substr(colon + 3);
// If a username and perhaps password are specified, give a warning.
std::string::size_type at_sign = host.find("@");
// Should this be supported?
if (at_sign != std::string::npos) {
// ProxyConfig does not support authentication parameters, but Chrome
// will prompt for the password later. Disregard the
// authentication parameters and continue with this hostname.
LOG(WARNING) << "Proxy authentication parameters ignored, see bug 16709";
host = host.substr(at_sign + 1);
}
// If this is a socks proxy, prepend a scheme so as to tell
// ProxyServer. This also allows ProxyServer to choose the right
// default port.
if (scheme == ProxyServer::SCHEME_SOCKS4)
host = "socks4://" + host;
else if (scheme == ProxyServer::SCHEME_SOCKS5)
host = "socks5://" + host;
// If there is a trailing slash, remove it so |host| will parse correctly
// even if it includes a port number (since the slash is not numeric).
if (!host.empty() && host.back() == '/')
host.resize(host.length() - 1);
return host;
}
ProxyConfigWithAnnotation GetConfigOrDirect(
const base::Optional<ProxyConfigWithAnnotation>& optional_config) {
if (optional_config)
return optional_config.value();
ProxyConfigWithAnnotation config = ProxyConfigWithAnnotation::CreateDirect();
return config;
}
} // namespace
ProxyConfigServiceLinux::Delegate::~Delegate() = default;
bool ProxyConfigServiceLinux::Delegate::GetProxyFromEnvVarForScheme(
base::StringPiece variable,
ProxyServer::Scheme scheme,
ProxyServer* result_server) {
std::string env_value;
if (!env_var_getter_->GetVar(variable, &env_value))
return false;
if (env_value.empty())
return false;
env_value = FixupProxyHostScheme(scheme, env_value);
ProxyServer proxy_server =
ProxyServer::FromURI(env_value, ProxyServer::SCHEME_HTTP);
if (proxy_server.is_valid() && !proxy_server.is_direct()) {
*result_server = proxy_server;
return true;
}
LOG(ERROR) << "Failed to parse environment variable " << variable;
return false;
}
bool ProxyConfigServiceLinux::Delegate::GetProxyFromEnvVar(
base::StringPiece variable,
ProxyServer* result_server) {
return GetProxyFromEnvVarForScheme(variable, ProxyServer::SCHEME_HTTP,
result_server);
}
base::Optional<ProxyConfigWithAnnotation>
ProxyConfigServiceLinux::Delegate::GetConfigFromEnv() {
ProxyConfig config;
// Check for automatic configuration first, in
// "auto_proxy". Possibly only the "environment_proxy" firefox
// extension has ever used this, but it still sounds like a good
// idea.
std::string auto_proxy;
if (env_var_getter_->GetVar("auto_proxy", &auto_proxy)) {
if (auto_proxy.empty()) {
// Defined and empty => autodetect
config.set_auto_detect(true);
} else {
// specified autoconfig URL
config.set_pac_url(GURL(auto_proxy));
}
return ProxyConfigWithAnnotation(
config, NetworkTrafficAnnotationTag(traffic_annotation_));
}
// "all_proxy" is a shortcut to avoid defining {http,https,ftp}_proxy.
ProxyServer proxy_server;
if (GetProxyFromEnvVar("all_proxy", &proxy_server)) {
config.proxy_rules().type = ProxyConfig::ProxyRules::Type::PROXY_LIST;
config.proxy_rules().single_proxies.SetSingleProxyServer(proxy_server);
} else {
bool have_http = GetProxyFromEnvVar("http_proxy", &proxy_server);
if (have_http)
config.proxy_rules().proxies_for_http.SetSingleProxyServer(proxy_server);
// It would be tempting to let http_proxy apply for all protocols
// if https_proxy and ftp_proxy are not defined. Googling turns up
// several documents that mention only http_proxy. But then the
// user really might not want to proxy https. And it doesn't seem
// like other apps do this. So we will refrain.
bool have_https = GetProxyFromEnvVar("https_proxy", &proxy_server);
if (have_https)
config.proxy_rules().proxies_for_https.SetSingleProxyServer(proxy_server);
bool have_ftp = GetProxyFromEnvVar("ftp_proxy", &proxy_server);
if (have_ftp)
config.proxy_rules().proxies_for_ftp.SetSingleProxyServer(proxy_server);
if (have_http || have_https || have_ftp) {
// mustn't change type unless some rules are actually set.
config.proxy_rules().type =
ProxyConfig::ProxyRules::Type::PROXY_LIST_PER_SCHEME;
}
}
if (config.proxy_rules().empty()) {
// If the above were not defined, try for socks.
// For environment variables, we default to version 5, per the gnome
// documentation: http://library.gnome.org/devel/gnet/stable/gnet-socks.html
ProxyServer::Scheme scheme = ProxyServer::SCHEME_SOCKS5;
std::string env_version;
if (env_var_getter_->GetVar("SOCKS_VERSION", &env_version)
&& env_version == "4")
scheme = ProxyServer::SCHEME_SOCKS4;
if (GetProxyFromEnvVarForScheme("SOCKS_SERVER", scheme, &proxy_server)) {
config.proxy_rules().type = ProxyConfig::ProxyRules::Type::PROXY_LIST;
config.proxy_rules().single_proxies.SetSingleProxyServer(proxy_server);
}
}
// Look for the proxy bypass list.
std::string no_proxy;
env_var_getter_->GetVar("no_proxy", &no_proxy);
if (config.proxy_rules().empty()) {
// Having only "no_proxy" set, presumably to "*", makes it
// explicit that env vars do specify a configuration: having no
// rules specified only means the user explicitly asks for direct
// connections.
return !no_proxy.empty()
? ProxyConfigWithAnnotation(
config, NetworkTrafficAnnotationTag(traffic_annotation_))
: base::Optional<ProxyConfigWithAnnotation>();
}
// Note that this uses "suffix" matching. So a bypass of "google.com"
// is understood to mean a bypass of "*google.com".
config.proxy_rules().bypass_rules.ParseFromString(no_proxy);
RewriteRulesForSuffixMatching(&config.proxy_rules().bypass_rules);
return ProxyConfigWithAnnotation(
config, NetworkTrafficAnnotationTag(traffic_annotation_));
}
namespace {
const int kDebounceTimeoutMilliseconds = 250;
#if defined(USE_GIO)
const char kProxyGSettingsSchema[] = "org.gnome.system.proxy";
// This setting getter uses gsettings, as used in most GNOME 3 desktops.
class SettingGetterImplGSettings
: public ProxyConfigServiceLinux::SettingGetter {
public:
SettingGetterImplGSettings()
: client_(nullptr),
http_client_(nullptr),
https_client_(nullptr),
ftp_client_(nullptr),
socks_client_(nullptr),
notify_delegate_(nullptr),
debounce_timer_(new base::OneShotTimer()) {}
~SettingGetterImplGSettings() override {
// client_ should have been released before now, from
// Delegate::OnDestroy(), while running on the UI thread. However
// on exiting the process, it may happen that
// Delegate::OnDestroy() task is left pending on the glib loop
// after the loop was quit, and pending tasks may then be deleted
// without being run.
if (client_) {
// gsettings client was not cleaned up.
if (task_runner_->RunsTasksInCurrentSequence()) {
// We are on the UI thread so we can clean it safely.
VLOG(1) << "~SettingGetterImplGSettings: releasing gsettings client";
ShutDown();
} else {
LOG(WARNING) << "~SettingGetterImplGSettings: leaking gsettings client";
client_ = nullptr;
}
}
DCHECK(!client_);
}
// CheckVersion() must be called *before* Init()!
bool CheckVersion(base::Environment* env);
bool Init(const scoped_refptr<base::SingleThreadTaskRunner>& glib_task_runner)
override {
DCHECK(glib_task_runner->RunsTasksInCurrentSequence());
DCHECK(!client_);
DCHECK(!task_runner_.get());
if (!g_settings_schema_source_lookup(g_settings_schema_source_get_default(),
kProxyGSettingsSchema, FALSE) ||
!(client_ = g_settings_new(kProxyGSettingsSchema))) {
// It's not clear whether/when this can return NULL.
LOG(ERROR) << "Unable to create a gsettings client";
return false;
}
task_runner_ = glib_task_runner;
// We assume these all work if the above call worked.
http_client_ = g_settings_get_child(client_, "http");
https_client_ = g_settings_get_child(client_, "https");
ftp_client_ = g_settings_get_child(client_, "ftp");
socks_client_ = g_settings_get_child(client_, "socks");
DCHECK(http_client_ && https_client_ && ftp_client_ && socks_client_);
return true;
}
void ShutDown() override {
if (client_) {
DCHECK(task_runner_->RunsTasksInCurrentSequence());
// This also disables gsettings notifications.
g_object_unref(socks_client_);
g_object_unref(ftp_client_);
g_object_unref(https_client_);
g_object_unref(http_client_);
g_object_unref(client_);
// We only need to null client_ because it's the only one that we check.
client_ = nullptr;
task_runner_ = nullptr;
}
debounce_timer_.reset();
}
bool SetUpNotifications(
ProxyConfigServiceLinux::Delegate* delegate) override {
DCHECK(client_);
DCHECK(task_runner_->RunsTasksInCurrentSequence());
notify_delegate_ = delegate;
// We could watch for the change-event signal instead of changed, but
// since we have to watch more than one object, we'd still have to
// debounce change notifications. This is conceptually simpler.
g_signal_connect(G_OBJECT(client_), "changed",
G_CALLBACK(OnGSettingsChangeNotification), this);
g_signal_connect(G_OBJECT(http_client_), "changed",
G_CALLBACK(OnGSettingsChangeNotification), this);
g_signal_connect(G_OBJECT(https_client_), "changed",
G_CALLBACK(OnGSettingsChangeNotification), this);
g_signal_connect(G_OBJECT(ftp_client_), "changed",
G_CALLBACK(OnGSettingsChangeNotification), this);
g_signal_connect(G_OBJECT(socks_client_), "changed",
G_CALLBACK(OnGSettingsChangeNotification), this);
// Simulate a change to avoid possibly losing updates before this point.
OnChangeNotification();
return true;
}
const scoped_refptr<base::SequencedTaskRunner>& GetNotificationTaskRunner()
override {
return task_runner_;
}
bool GetString(StringSetting key, std::string* result) override {
DCHECK(client_);
switch (key) {
case PROXY_MODE:
return GetStringByPath(client_, "mode", result);
case PROXY_AUTOCONF_URL:
return GetStringByPath(client_, "autoconfig-url", result);
case PROXY_HTTP_HOST:
return GetStringByPath(http_client_, "host", result);
case PROXY_HTTPS_HOST:
return GetStringByPath(https_client_, "host", result);
case PROXY_FTP_HOST:
return GetStringByPath(ftp_client_, "host", result);
case PROXY_SOCKS_HOST:
return GetStringByPath(socks_client_, "host", result);
}
return false; // Placate compiler.
}
bool GetBool(BoolSetting key, bool* result) override {
DCHECK(client_);
switch (key) {
case PROXY_USE_HTTP_PROXY:
// Although there is an "enabled" boolean in http_client_, it is not set
// to true by the proxy config utility. We ignore it and return false.
return false;
case PROXY_USE_SAME_PROXY:
// Similarly, although there is a "use-same-proxy" boolean in client_,
// it is never set to false by the proxy config utility. We ignore it.
return false;
case PROXY_USE_AUTHENTICATION:
// There is also no way to set this in the proxy config utility, but it
// doesn't hurt us to get the actual setting (unlike the two above).
return GetBoolByPath(http_client_, "use-authentication", result);
}
return false; // Placate compiler.
}
bool GetInt(IntSetting key, int* result) override {
DCHECK(client_);
switch (key) {
case PROXY_HTTP_PORT:
return GetIntByPath(http_client_, "port", result);
case PROXY_HTTPS_PORT:
return GetIntByPath(https_client_, "port", result);
case PROXY_FTP_PORT:
return GetIntByPath(ftp_client_, "port", result);
case PROXY_SOCKS_PORT:
return GetIntByPath(socks_client_, "port", result);
}
return false; // Placate compiler.
}
bool GetStringList(StringListSetting key,
std::vector<std::string>* result) override {
DCHECK(client_);
switch (key) {
case PROXY_IGNORE_HOSTS:
return GetStringListByPath(client_, "ignore-hosts", result);
}
return false; // Placate compiler.
}
bool BypassListIsReversed() override {
// This is a KDE-specific setting.
return false;
}
bool UseSuffixMatching() override { return false; }
private:
bool GetStringByPath(GSettings* client,
base::StringPiece key,
std::string* result) {
DCHECK(task_runner_->RunsTasksInCurrentSequence());
gchar* value = g_settings_get_string(client, key.data());
if (!value)
return false;
*result = value;
g_free(value);
return true;
}
bool GetBoolByPath(GSettings* client, base::StringPiece key, bool* result) {
DCHECK(task_runner_->RunsTasksInCurrentSequence());
*result = static_cast<bool>(g_settings_get_boolean(client, key.data()));
return true;
}
bool GetIntByPath(GSettings* client, base::StringPiece key, int* result) {
DCHECK(task_runner_->RunsTasksInCurrentSequence());
*result = g_settings_get_int(client, key.data());
return true;
}
bool GetStringListByPath(GSettings* client,
base::StringPiece key,
std::vector<std::string>* result) {
DCHECK(task_runner_->RunsTasksInCurrentSequence());
gchar** list = g_settings_get_strv(client, key.data());
if (!list)
return false;
for (size_t i = 0; list[i]; ++i) {
result->push_back(static_cast<char*>(list[i]));
g_free(list[i]);
}
g_free(list);
return true;
}
// This is the callback from the debounce timer.
void OnDebouncedNotification() {
DCHECK(task_runner_->RunsTasksInCurrentSequence());
CHECK(notify_delegate_);
// Forward to a method on the proxy config service delegate object.
notify_delegate_->OnCheckProxyConfigSettings();
}
void OnChangeNotification() {
// We don't use Reset() because the timer may not yet be running.
// (In that case Stop() is a no-op.)
debounce_timer_->Stop();
debounce_timer_->Start(FROM_HERE,
base::TimeDelta::FromMilliseconds(kDebounceTimeoutMilliseconds),
this, &SettingGetterImplGSettings::OnDebouncedNotification);
}
// gsettings notification callback, dispatched on the default glib main loop.
static void OnGSettingsChangeNotification(GSettings* client, gchar* key,
gpointer user_data) {
VLOG(1) << "gsettings change notification for key " << key;
// We don't track which key has changed, just that something did change.
SettingGetterImplGSettings* setting_getter =
reinterpret_cast<SettingGetterImplGSettings*>(user_data);
setting_getter->OnChangeNotification();
}
GSettings* client_;
GSettings* http_client_;
GSettings* https_client_;
GSettings* ftp_client_;
GSettings* socks_client_;
ProxyConfigServiceLinux::Delegate* notify_delegate_;
std::unique_ptr<base::OneShotTimer> debounce_timer_;
// Task runner for the thread that we make gsettings calls on. It should
// be the UI thread and all our methods should be called on this
// thread. Only for assertions.
scoped_refptr<base::SequencedTaskRunner> task_runner_;
DISALLOW_COPY_AND_ASSIGN(SettingGetterImplGSettings);
};
bool SettingGetterImplGSettings::CheckVersion(
base::Environment* env) {
// CheckVersion() must be called *before* Init()!
DCHECK(!client_);
GSettings* client = nullptr;
if (g_settings_schema_source_lookup(g_settings_schema_source_get_default(),
kProxyGSettingsSchema, FALSE)) {
client = g_settings_new(kProxyGSettingsSchema);
}
if (!client) {
VLOG(1) << "Cannot create gsettings client.";
return false;
}
g_object_unref(client);
VLOG(1) << "All gsettings tests OK. Will get proxy config from gsettings.";
return true;
}
#endif // defined(USE_GIO)
// Converts |value| from a decimal string to an int. If there was a failure
// parsing, returns |default_value|.
int StringToIntOrDefault(base::StringPiece value, int default_value) {
int result;
if (base::StringToInt(value, &result))
return result;
return default_value;
}
// This is the KDE version that reads kioslaverc and simulates gsettings.
// Doing this allows the main Delegate code, as well as the unit tests
// for it, to stay the same - and the settings map fairly well besides.
class SettingGetterImplKDE : public ProxyConfigServiceLinux::SettingGetter {
public:
explicit SettingGetterImplKDE(base::Environment* env_var_getter)
: inotify_fd_(-1),
notify_delegate_(nullptr),
debounce_timer_(new base::OneShotTimer()),
indirect_manual_(false),
auto_no_pac_(false),
reversed_bypass_list_(false),
env_var_getter_(env_var_getter),
file_task_runner_(nullptr) {
// This has to be called on the UI thread (http://crbug.com/69057).
base::ThreadRestrictions::ScopedAllowIO allow_io;
// Derive the location of the kde config dir from the environment.
std::string home;
if (env_var_getter->GetVar("KDEHOME", &home) && !home.empty()) {
// $KDEHOME is set. Use it unconditionally.
kde_config_dir_ = KDEHomeToConfigPath(base::FilePath(home));
} else {
// $KDEHOME is unset. Try to figure out what to use. This seems to be
// the common case on most distributions.
if (!env_var_getter->GetVar(base::env_vars::kHome, &home))
// User has no $HOME? Give up. Later we'll report the failure.
return;
if (base::nix::GetDesktopEnvironment(env_var_getter) ==
base::nix::DESKTOP_ENVIRONMENT_KDE3) {
// KDE3 always uses .kde for its configuration.
base::FilePath kde_path = base::FilePath(home).Append(".kde");
kde_config_dir_ = KDEHomeToConfigPath(kde_path);
} else if (base::nix::GetDesktopEnvironment(env_var_getter) ==
base::nix::DESKTOP_ENVIRONMENT_KDE4) {
// Some distributions patch KDE4 to use .kde4 instead of .kde, so that
// both can be installed side-by-side. Sadly they don't all do this, and
// they don't always do this: some distributions have started switching
// back as well. So if there is a .kde4 directory, check the timestamps
// of the config directories within and use the newest one.
// Note that we should currently be running in the UI thread, because in
// the gsettings version, that is the only thread that can access the
// proxy settings (a gsettings restriction). As noted below, the initial
// read of the proxy settings will be done in this thread anyway, so we
// check for .kde4 here in this thread as well.
base::FilePath kde3_path = base::FilePath(home).Append(".kde");
base::FilePath kde3_config = KDEHomeToConfigPath(kde3_path);
base::FilePath kde4_path = base::FilePath(home).Append(".kde4");
base::FilePath kde4_config = KDEHomeToConfigPath(kde4_path);
bool use_kde4 = false;
if (base::DirectoryExists(kde4_path)) {
base::File::Info kde3_info;
base::File::Info kde4_info;
if (base::GetFileInfo(kde4_config, &kde4_info)) {
if (base::GetFileInfo(kde3_config, &kde3_info)) {
use_kde4 = kde4_info.last_modified >= kde3_info.last_modified;
} else {
use_kde4 = true;
}
}
}
if (use_kde4) {
kde_config_dir_ = KDEHomeToConfigPath(kde4_path);
} else {
kde_config_dir_ = KDEHomeToConfigPath(kde3_path);
}
} else {
// KDE 5 migrated to ~/.config for storing kioslaverc.
kde_config_dir_ = base::FilePath(home).Append(".config");
}
}
}
~SettingGetterImplKDE() override {
// inotify_fd_ should have been closed before now, from
// Delegate::OnDestroy(), while running on the file thread. However
// on exiting the process, it may happen that Delegate::OnDestroy()
// task is left pending on the file loop after the loop was quit,
// and pending tasks may then be deleted without being run.
// Here in the KDE version, we can safely close the file descriptor
// anyway. (Not that it really matters; the process is exiting.)
if (inotify_fd_ >= 0)
ShutDown();
DCHECK_LT(inotify_fd_, 0);
}
bool Init(const scoped_refptr<base::SingleThreadTaskRunner>& glib_task_runner)
override {
// This has to be called on the UI thread (http://crbug.com/69057).
base::ThreadRestrictions::ScopedAllowIO allow_io;
DCHECK_LT(inotify_fd_, 0);
inotify_fd_ = inotify_init();
if (inotify_fd_ < 0) {
PLOG(ERROR) << "inotify_init failed";
return false;
}
if (!base::SetNonBlocking(inotify_fd_)) {
PLOG(ERROR) << "base::SetNonBlocking failed";
close(inotify_fd_);
inotify_fd_ = -1;
return false;
}
constexpr base::TaskTraits kTraits = {base::TaskPriority::USER_VISIBLE,
base::MayBlock()};
file_task_runner_ = base::ThreadPool::CreateSequencedTaskRunner(kTraits);
// The initial read is done on the current thread, not
// |file_task_runner_|, since we will need to have it for
// SetUpAndFetchInitialConfig().
UpdateCachedSettings();
return true;
}
void ShutDown() override {
if (inotify_fd_ >= 0) {
ResetCachedSettings();
inotify_watcher_.reset();
close(inotify_fd_);
inotify_fd_ = -1;
}
debounce_timer_.reset();
}
bool SetUpNotifications(
ProxyConfigServiceLinux::Delegate* delegate) override {
DCHECK_GE(inotify_fd_, 0);
DCHECK(file_task_runner_->RunsTasksInCurrentSequence());
// We can't just watch the kioslaverc file directly, since KDE will write
// a new copy of it and then rename it whenever settings are changed and
// inotify watches inodes (so we'll be watching the old deleted file after
// the first change, and it will never change again). So, we watch the
// directory instead. We then act only on changes to the kioslaverc entry.
// TODO(eroman): What if the file is deleted? (handle with IN_DELETE).
if (inotify_add_watch(inotify_fd_, kde_config_dir_.value().c_str(),
IN_MODIFY | IN_MOVED_TO) < 0) {
return false;
}
notify_delegate_ = delegate;
inotify_watcher_ = base::FileDescriptorWatcher::WatchReadable(
inotify_fd_,
base::BindRepeating(&SettingGetterImplKDE::OnChangeNotification,
base::Unretained(this)));
// Simulate a change to avoid possibly losing updates before this point.
OnChangeNotification();
return true;
}
const scoped_refptr<base::SequencedTaskRunner>& GetNotificationTaskRunner()
override {
return file_task_runner_;
}
bool GetString(StringSetting key, std::string* result) override {
auto it = string_table_.find(key);
if (it == string_table_.end())
return false;
*result = it->second;
return true;
}
bool GetBool(BoolSetting key, bool* result) override {
// We don't ever have any booleans.
return false;
}
bool GetInt(IntSetting key, int* result) override {
// We don't ever have any integers. (See AddProxy() below about ports.)
return false;
}
bool GetStringList(StringListSetting key,
std::vector<std::string>* result) override {
auto it = strings_table_.find(key);
if (it == strings_table_.end())
return false;
*result = it->second;
return true;
}
bool BypassListIsReversed() override { return reversed_bypass_list_; }
bool UseSuffixMatching() override { return true; }
private:
void ResetCachedSettings() {
string_table_.clear();
strings_table_.clear();
indirect_manual_ = false;
auto_no_pac_ = false;
reversed_bypass_list_ = false;
}
base::FilePath KDEHomeToConfigPath(const base::FilePath& kde_home) {
return kde_home.Append("share").Append("config");
}
void AddProxy(StringSetting host_key, const std::string& value) {
if (value.empty() || value.substr(0, 3) == "//:")
// No proxy.
return;
size_t space = value.find(' ');
if (space != std::string::npos) {
// Newer versions of KDE use a space rather than a colon to separate the
// port number from the hostname. If we find this, we need to convert it.
std::string fixed = value;
fixed[space] = ':';
string_table_[host_key] = fixed;
} else {
// We don't need to parse the port number out; GetProxyFromSettings()
// would only append it right back again. So we just leave the port
// number right in the host string.
string_table_[host_key] = value;
}
}
void AddHostList(StringListSetting key, const std::string& value) {
std::vector<std::string> tokens;
base::StringTokenizer tk(value, ", ");
while (tk.GetNext()) {
std::string token = tk.token();
if (!token.empty())
tokens.push_back(token);
}
strings_table_[key] = tokens;
}
void AddKDESetting(const std::string& key, const std::string& value) {
if (key == "ProxyType") {
const char* mode = "none";
indirect_manual_ = false;
auto_no_pac_ = false;
int int_value = StringToIntOrDefault(value, 0);
switch (int_value) {
case 1: // Manual configuration.
mode = "manual";
break;
case 2: // PAC URL.
mode = "auto";
break;
case 3: // WPAD.
mode = "auto";
auto_no_pac_ = true;
break;
case 4: // Indirect manual via environment variables.
mode = "manual";
indirect_manual_ = true;
break;
default: // No proxy, or maybe kioslaverc syntax error.
break;
}
string_table_[PROXY_MODE] = mode;
} else if (key == "Proxy Config Script") {
string_table_[PROXY_AUTOCONF_URL] = value;
} else if (key == "httpProxy") {
AddProxy(PROXY_HTTP_HOST, value);
} else if (key == "httpsProxy") {
AddProxy(PROXY_HTTPS_HOST, value);
} else if (key == "ftpProxy") {
AddProxy(PROXY_FTP_HOST, value);
} else if (key == "socksProxy") {
// Older versions of KDE configure SOCKS in a weird way involving
// LD_PRELOAD and a library that intercepts network calls to SOCKSify
// them. We don't support it. KDE 4.8 added a proper SOCKS setting.
AddProxy(PROXY_SOCKS_HOST, value);
} else if (key == "ReversedException") {
// We count "true" or any nonzero number as true, otherwise false.
// A failure parsing the integer will also mean false.
reversed_bypass_list_ =
(value == "true" || StringToIntOrDefault(value, 0) != 0);
} else if (key == "NoProxyFor") {
AddHostList(PROXY_IGNORE_HOSTS, value);
} else if (key == "AuthMode") {
// Check for authentication, just so we can warn.
int mode = StringToIntOrDefault(value, 0);
if (mode) {
// ProxyConfig does not support authentication parameters, but
// Chrome will prompt for the password later. So we ignore this.
LOG(WARNING) <<
"Proxy authentication parameters ignored, see bug 16709";
}
}
}
void ResolveIndirect(StringSetting key) {
auto it = string_table_.find(key);
if (it != string_table_.end()) {
std::string value;
if (env_var_getter_->GetVar(it->second.c_str(), &value))
it->second = value;
else
string_table_.erase(it);
}
}
void ResolveIndirectList(StringListSetting key) {
auto it = strings_table_.find(key);
if (it != strings_table_.end()) {
std::string value;
if (!it->second.empty() &&
env_var_getter_->GetVar(it->second[0].c_str(), &value))
AddHostList(key, value);
else
strings_table_.erase(it);
}
}
// The settings in kioslaverc could occur in any order, but some affect
// others. Rather than read the whole file in and then query them in an
// order that allows us to handle that, we read the settings in whatever
// order they occur and do any necessary tweaking after we finish.
void ResolveModeEffects() {
if (indirect_manual_) {
ResolveIndirect(PROXY_HTTP_HOST);
ResolveIndirect(PROXY_HTTPS_HOST);
ResolveIndirect(PROXY_FTP_HOST);
ResolveIndirectList(PROXY_IGNORE_HOSTS);
}
if (auto_no_pac_) {
// Remove the PAC URL; we're not supposed to use it.
string_table_.erase(PROXY_AUTOCONF_URL);
}
}
// Reads kioslaverc one line at a time and calls AddKDESetting() to add
// each relevant name-value pair to the appropriate value table.
void UpdateCachedSettings() {
base::FilePath kioslaverc = kde_config_dir_.Append("kioslaverc");
base::ScopedFILE input(base::OpenFile(kioslaverc, "r"));
if (!input.get())
return;
ResetCachedSettings();
bool in_proxy_settings = false;
bool line_too_long = false;
char line[BUFFER_SIZE];
// fgets() will return NULL on EOF or error.
while (fgets(line, sizeof(line), input.get())) {
// fgets() guarantees the line will be properly terminated.
size_t length = strlen(line);
if (!length)
continue;
// This should be true even with CRLF endings.
if (line[length - 1] != '\n') {
line_too_long = true;
continue;
}
if (line_too_long) {
// The previous line had no line ending, but this done does. This is
// the end of the line that was too long, so warn here and skip it.
LOG(WARNING) << "skipped very long line in " << kioslaverc.value();
line_too_long = false;
continue;
}
// Remove the LF at the end, and the CR if there is one.
line[--length] = '\0';
if (length && line[length - 1] == '\r')
line[--length] = '\0';
// Now parse the line.
if (line[0] == '[') {
// Switching sections. All we care about is whether this is
// the (a?) proxy settings section, for both KDE3 and KDE4.
in_proxy_settings = !strncmp(line, "[Proxy Settings]", 16);
} else if (in_proxy_settings) {
// A regular line, in the (a?) proxy settings section.
char* split = strchr(line, '=');
// Skip this line if it does not contain an = sign.
if (!split)
continue;
// Split the line on the = and advance |split|.
*(split++) = 0;
std::string key = line;
std::string value = split;
base::TrimWhitespaceASCII(key, base::TRIM_ALL, &key);
base::TrimWhitespaceASCII(value, base::TRIM_ALL, &value);
// Skip this line if the key name is empty.
if (key.empty())
continue;
// Is the value name localized?
if (key[key.length() - 1] == ']') {
// Find the matching bracket.
length = key.rfind('[');
// Skip this line if the localization indicator is malformed.
if (length == std::string::npos)
continue;
// Trim the localization indicator off.
key.resize(length);
// Remove any resulting trailing whitespace.
base::TrimWhitespaceASCII(key, base::TRIM_TRAILING, &key);
// Skip this line if the key name is now empty.
if (key.empty())
continue;
}
// Now fill in the tables.
AddKDESetting(key, value);
}
}
if (ferror(input.get()))
LOG(ERROR) << "error reading " << kioslaverc.value();
ResolveModeEffects();
}
// This is the callback from the debounce timer.
void OnDebouncedNotification() {
DCHECK(file_task_runner_->RunsTasksInCurrentSequence());
VLOG(1) << "inotify change notification for kioslaverc";
UpdateCachedSettings();
CHECK(notify_delegate_);
// Forward to a method on the proxy config service delegate object.
notify_delegate_->OnCheckProxyConfigSettings();
}
// Called by OnFileCanReadWithoutBlocking() on the file thread. Reads
// from the inotify file descriptor and starts up a debounce timer if
// an event for kioslaverc is seen.
void OnChangeNotification() {
DCHECK_GE(inotify_fd_, 0);
DCHECK(file_task_runner_->RunsTasksInCurrentSequence());
char event_buf[(sizeof(inotify_event) + NAME_MAX + 1) * 4];
bool kioslaverc_touched = false;
ssize_t r;
while ((r = read(inotify_fd_, event_buf, sizeof(event_buf))) > 0) {
// inotify returns variable-length structures, which is why we have
// this strange-looking loop instead of iterating through an array.
char* event_ptr = event_buf;
while (event_ptr < event_buf + r) {
inotify_event* event = reinterpret_cast<inotify_event*>(event_ptr);
// The kernel always feeds us whole events.
CHECK_LE(event_ptr + sizeof(inotify_event), event_buf + r);
CHECK_LE(event->name + event->len, event_buf + r);
if (!strcmp(event->name, "kioslaverc"))
kioslaverc_touched = true;
// Advance the pointer just past the end of the filename.
event_ptr = event->name + event->len;
}
// We keep reading even if |kioslaverc_touched| is true to drain the
// inotify event queue.
}
if (!r)
// Instead of returning -1 and setting errno to EINVAL if there is not
// enough buffer space, older kernels (< 2.6.21) return 0. Simulate the
// new behavior (EINVAL) so we can reuse the code below.
errno = EINVAL;
if (errno != EAGAIN) {
PLOG(WARNING) << "error reading inotify file descriptor";
if (errno == EINVAL) {
// Our buffer is not large enough to read the next event. This should
// not happen (because its size is calculated to always be sufficiently
// large), but if it does we'd warn continuously since |inotify_fd_|
// would be forever ready to read. Close it and stop watching instead.
LOG(ERROR) << "inotify failure; no longer watching kioslaverc!";
inotify_watcher_.reset();
close(inotify_fd_);
inotify_fd_ = -1;
}
}
if (kioslaverc_touched) {
LOG(ERROR) << "kioslaverc_touched";
// We don't use Reset() because the timer may not yet be running.
// (In that case Stop() is a no-op.)
debounce_timer_->Stop();
debounce_timer_->Start(FROM_HERE, base::TimeDelta::FromMilliseconds(
kDebounceTimeoutMilliseconds), this,
&SettingGetterImplKDE::OnDebouncedNotification);
}
}
typedef std::map<StringSetting, std::string> string_map_type;
typedef std::map<StringListSetting,
std::vector<std::string> > strings_map_type;
int inotify_fd_;
std::unique_ptr<base::FileDescriptorWatcher::Controller> inotify_watcher_;
ProxyConfigServiceLinux::Delegate* notify_delegate_;
std::unique_ptr<base::OneShotTimer> debounce_timer_;
base::FilePath kde_config_dir_;
bool indirect_manual_;
bool auto_no_pac_;
bool reversed_bypass_list_;
// We don't own |env_var_getter_|. It's safe to hold a pointer to it, since
// both it and us are owned by ProxyConfigServiceLinux::Delegate, and have the
// same lifetime.
base::Environment* env_var_getter_;
// We cache these settings whenever we re-read the kioslaverc file.
string_map_type string_table_;
strings_map_type strings_table_;
// Task runner for doing blocking file IO on, as well as handling inotify
// events on.
scoped_refptr<base::SequencedTaskRunner> file_task_runner_;