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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/intranet_redirect_detector.h"
#include "base/bind.h"
#include "base/command_line.h"
#include "base/prefs/pref_registry_simple.h"
#include "base/prefs/pref_service.h"
#include "base/rand_util.h"
#include "base/stl_util.h"
#include "base/strings/utf_string_conversions.h"
#include "chrome/browser/browser_process.h"
#include "chrome/common/chrome_switches.h"
#include "chrome/common/pref_names.h"
#include "net/base/load_flags.h"
#include "net/base/net_errors.h"
#include "net/base/registry_controlled_domains/registry_controlled_domain.h"
#include "net/url_request/url_fetcher.h"
#include "net/url_request/url_request_context_getter.h"
#include "net/url_request/url_request_status.h"
IntranetRedirectDetector::IntranetRedirectDetector()
: redirect_origin_(g_browser_process->local_state()->GetString(
prefs::kLastKnownIntranetRedirectOrigin)),
in_sleep_(true),
weak_ptr_factory_(this) {
// Because this function can be called during startup, when kicking off a URL
// fetch can eat up 20 ms of time, we delay seven seconds, which is hopefully
// long enough to be after startup, but still get results back quickly.
// Ideally, instead of this timer, we'd do something like "check if the
// browser is starting up, and if so, come back later", but there is currently
// no function to do this.
static const int kStartFetchDelaySeconds = 7;
base::MessageLoop::current()->PostDelayedTask(FROM_HERE,
base::Bind(&IntranetRedirectDetector::FinishSleep,
weak_ptr_factory_.GetWeakPtr()),
base::TimeDelta::FromSeconds(kStartFetchDelaySeconds));
net::NetworkChangeNotifier::AddIPAddressObserver(this);
}
IntranetRedirectDetector::~IntranetRedirectDetector() {
net::NetworkChangeNotifier::RemoveIPAddressObserver(this);
STLDeleteElements(&fetchers_);
}
// static
GURL IntranetRedirectDetector::RedirectOrigin() {
const IntranetRedirectDetector* const detector =
g_browser_process->intranet_redirect_detector();
return detector ? detector->redirect_origin_ : GURL();
}
// static
void IntranetRedirectDetector::RegisterPrefs(PrefRegistrySimple* registry) {
registry->RegisterStringPref(prefs::kLastKnownIntranetRedirectOrigin,
std::string());
}
void IntranetRedirectDetector::FinishSleep() {
in_sleep_ = false;
// If another fetch operation is still running, cancel it.
STLDeleteElements(&fetchers_);
resulting_origins_.clear();
const base::CommandLine* cmd_line = base::CommandLine::ForCurrentProcess();
if (cmd_line->HasSwitch(switches::kDisableBackgroundNetworking))
return;
DCHECK(fetchers_.empty() && resulting_origins_.empty());
// Start three fetchers on random hostnames.
for (size_t i = 0; i < 3; ++i) {
std::string url_string("http://");
// We generate a random hostname with between 7 and 15 characters.
const int num_chars = base::RandInt(7, 15);
for (int j = 0; j < num_chars; ++j)
url_string += ('a' + base::RandInt(0, 'z' - 'a'));
GURL random_url(url_string + '/');
net::URLFetcher* fetcher = net::URLFetcher::Create(
random_url, net::URLFetcher::HEAD, this);
// We don't want these fetches to affect existing state in the profile.
fetcher->SetLoadFlags(net::LOAD_DISABLE_CACHE |
net::LOAD_DO_NOT_SAVE_COOKIES |
net::LOAD_DO_NOT_SEND_COOKIES);
fetcher->SetRequestContext(g_browser_process->system_request_context());
fetcher->Start();
fetchers_.insert(fetcher);
}
}
void IntranetRedirectDetector::OnURLFetchComplete(
const net::URLFetcher* source) {
// Delete the fetcher on this function's exit.
Fetchers::iterator fetcher = fetchers_.find(
const_cast<net::URLFetcher*>(source));
DCHECK(fetcher != fetchers_.end());
scoped_ptr<net::URLFetcher> clean_up_fetcher(*fetcher);
fetchers_.erase(fetcher);
// If any two fetches result in the same domain/host, we set the redirect
// origin to that; otherwise we set it to nothing.
if (!source->GetStatus().is_success() || (source->GetResponseCode() != 200)) {
if ((resulting_origins_.empty()) ||
((resulting_origins_.size() == 1) &&
resulting_origins_.front().is_valid())) {
resulting_origins_.push_back(GURL());
return;
}
redirect_origin_ = GURL();
} else {
DCHECK(source->GetURL().is_valid());
GURL origin(source->GetURL().GetOrigin());
if (resulting_origins_.empty()) {
resulting_origins_.push_back(origin);
return;
}
if (net::registry_controlled_domains::SameDomainOrHost(
resulting_origins_.front(),
origin,
net::registry_controlled_domains::EXCLUDE_PRIVATE_REGISTRIES)) {
redirect_origin_ = origin;
if (!fetchers_.empty()) {
// Cancel remaining fetch, we don't need it.
DCHECK(fetchers_.size() == 1);
delete (*fetchers_.begin());
fetchers_.clear();
}
}
if (resulting_origins_.size() == 1) {
resulting_origins_.push_back(origin);
return;
}
DCHECK(resulting_origins_.size() == 2);
const bool same_domain_or_host =
net::registry_controlled_domains::SameDomainOrHost(
resulting_origins_.back(),
origin,
net::registry_controlled_domains::EXCLUDE_PRIVATE_REGISTRIES);
redirect_origin_ = same_domain_or_host ? origin : GURL();
}
g_browser_process->local_state()->SetString(
prefs::kLastKnownIntranetRedirectOrigin, redirect_origin_.is_valid() ?
redirect_origin_.spec() : std::string());
}
void IntranetRedirectDetector::OnIPAddressChanged() {
// If a request is already scheduled, do not scheduled yet another one.
if (in_sleep_)
return;
// Since presumably many programs open connections after network changes,
// delay this a little bit.
in_sleep_ = true;
static const int kNetworkSwitchDelayMS = 1000;
base::MessageLoop::current()->PostDelayedTask(FROM_HERE,
base::Bind(&IntranetRedirectDetector::FinishSleep,
weak_ptr_factory_.GetWeakPtr()),
base::TimeDelta::FromMilliseconds(kNetworkSwitchDelayMS));
}
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