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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/intranet_redirect_detector.h"
#include "base/command_line.h"
#include "base/rand_util.h"
#include "base/stl_util-inl.h"
#include "base/utf_string_conversions.h"
#include "chrome/browser/browser_process.h"
#include "chrome/browser/prefs/pref_service.h"
#include "chrome/common/chrome_switches.h"
#include "chrome/common/pref_names.h"
#include "content/common/notification_service.h"
#include "net/base/load_flags.h"
#include "net/base/net_errors.h"
#include "net/base/registry_controlled_domain.h"
#include "net/url_request/url_request_context_getter.h"
#include "net/url_request/url_request_status.h"
const size_t IntranetRedirectDetector::kNumCharsInHostnames = 10;
IntranetRedirectDetector::IntranetRedirectDetector()
: redirect_origin_(g_browser_process->local_state()->GetString(
prefs::kLastKnownIntranetRedirectOrigin)),
ALLOW_THIS_IN_INITIALIZER_LIST(fetcher_factory_(this)),
in_sleep_(true) {
// 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 kStartFetchDelayMS = 7000;
MessageLoop::current()->PostDelayedTask(FROM_HERE,
fetcher_factory_.NewRunnableMethod(
&IntranetRedirectDetector::FinishSleep),
kStartFetchDelayMS);
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(PrefService* prefs) {
prefs->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();
// The detector is not needed in Chrome Frame since we have no omnibox there.
const CommandLine* cmd_line = CommandLine::ForCurrentProcess();
if (cmd_line->HasSwitch(switches::kDisableBackgroundNetworking) ||
cmd_line->HasSwitch(switches::kChromeFrame))
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://");
for (size_t j = 0; j < kNumCharsInHostnames; ++j)
url_string += ('a' + base::RandInt(0, 'z' - 'a'));
GURL random_url(url_string + '/');
URLFetcher* fetcher = new URLFetcher(random_url, URLFetcher::HEAD, this);
// We don't want these fetches to affect existing state in the profile.
fetcher->set_load_flags(net::LOAD_DISABLE_CACHE |
net::LOAD_DO_NOT_SAVE_COOKIES);
fetcher->set_request_context(g_browser_process->system_request_context());
fetcher->Start();
fetchers_.insert(fetcher);
}
}
void IntranetRedirectDetector::OnURLFetchComplete(
const URLFetcher* source,
const GURL& url,
const net::URLRequestStatus& status,
int response_code,
const ResponseCookies& cookies,
const std::string& data) {
// Delete the fetcher on this function's exit.
Fetchers::iterator fetcher = fetchers_.find(const_cast<URLFetcher*>(source));
DCHECK(fetcher != fetchers_.end());
scoped_ptr<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 (!status.is_success() || (response_code != 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(url.is_valid());
GURL origin(url.GetOrigin());
if (resulting_origins_.empty()) {
resulting_origins_.push_back(origin);
return;
}
if (net::RegistryControlledDomainService::SameDomainOrHost(
resulting_origins_.front(), origin)) {
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);
redirect_origin_ = net::RegistryControlledDomainService::SameDomainOrHost(
resulting_origins_.back(), origin) ? 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;
MessageLoop::current()->PostDelayedTask(FROM_HERE,
fetcher_factory_.NewRunnableMethod(
&IntranetRedirectDetector::FinishSleep),
kNetworkSwitchDelayMS);
}
IntranetRedirectHostResolverProc::IntranetRedirectHostResolverProc(
net::HostResolverProc* previous)
: net::HostResolverProc(previous) {
}
int IntranetRedirectHostResolverProc::Resolve(
const std::string& host,
net::AddressFamily address_family,
net::HostResolverFlags host_resolver_flags,
net::AddressList* addrlist,
int* os_error) {
// We'd love to just ask the IntranetRedirectDetector, but we may not be on
// the same thread. So just use the heuristic that any all-lowercase a-z
// hostname with the right number of characters is likely from the detector
// (and thus should be blocked).
return ((host.length() == IntranetRedirectDetector::kNumCharsInHostnames) &&
(host.find_first_not_of("abcdefghijklmnopqrstuvwxyz") ==
std::string::npos)) ?
net::ERR_NAME_NOT_RESOLVED :
ResolveUsingPrevious(host, address_family, host_resolver_flags, addrlist,
os_error);
}
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