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      1 // Copyright (c) 2011 The Chromium Authors. All rights reserved.
      2 // Use of this source code is governed by a BSD-style license that can be
      3 // found in the LICENSE file.
      4 
      5 #ifndef CHROME_BROWSER_INTRANET_REDIRECT_DETECTOR_H_
      6 #define CHROME_BROWSER_INTRANET_REDIRECT_DETECTOR_H_
      7 #pragma once
      8 
      9 #include <set>
     10 #include <string>
     11 #include <vector>
     12 
     13 #include "chrome/common/net/url_fetcher.h"
     14 #include "content/common/notification_observer.h"
     15 #include "content/common/notification_registrar.h"
     16 #include "googleurl/src/gurl.h"
     17 #include "net/base/host_resolver_proc.h"
     18 #include "net/base/network_change_notifier.h"
     19 
     20 class PrefService;
     21 
     22 // This object is responsible for determining whether the user is on a network
     23 // that redirects requests for intranet hostnames to another site, and if so,
     24 // tracking what that site is (including across restarts via a pref).  For
     25 // example, the user's ISP might convert a request for "http://query/" into a
     26 // 302 redirect to "http://isp.domain.com/search?q=query" in order to display
     27 // custom pages on typos, nonexistent sites, etc.
     28 //
     29 // We use this information in the AlternateNavURLFetcher to avoid displaying
     30 // infobars for these cases.  Our infobars are designed to allow users to get at
     31 // intranet sites when they were erroneously taken to a search result page.  In
     32 // these cases, however, users would be shown a confusing and useless infobar
     33 // when they really did mean to do a search.
     34 //
     35 // Consumers should call RedirectOrigin(), which is guaranteed to synchronously
     36 // return a value at all times (even during startup or in unittest mode).  If no
     37 // redirection is in place, the returned GURL will be empty.
     38 class IntranetRedirectDetector
     39     : public URLFetcher::Delegate,
     40       public net::NetworkChangeNotifier::IPAddressObserver {
     41  public:
     42   // Only the main browser process loop should call this, when setting up
     43   // g_browser_process->intranet_redirect_detector_.  No code other than the
     44   // IntranetRedirectDetector itself should actually use
     45   // g_browser_process->intranet_redirect_detector() (which shouldn't be hard,
     46   // since there aren't useful public functions on this object for consumers to
     47   // access anyway).
     48   IntranetRedirectDetector();
     49   ~IntranetRedirectDetector();
     50 
     51   // Returns the current redirect origin.  This will be empty if no redirection
     52   // is in place.
     53   static GURL RedirectOrigin();
     54 
     55   static void RegisterPrefs(PrefService* prefs);
     56 
     57   // The number of characters the fetcher will use for its randomly-generated
     58   // hostnames.
     59   static const size_t kNumCharsInHostnames;
     60 
     61  private:
     62   typedef std::set<URLFetcher*> Fetchers;
     63 
     64   // Called when the seven second startup sleep or the one second network
     65   // switch sleep has finished.  Runs any pending fetch.
     66   void FinishSleep();
     67 
     68   // URLFetcher::Delegate
     69   virtual void OnURLFetchComplete(const URLFetcher* source,
     70                                   const GURL& url,
     71                                   const net::URLRequestStatus& status,
     72                                   int response_code,
     73                                   const ResponseCookies& cookies,
     74                                   const std::string& data);
     75 
     76   // NetworkChangeNotifier::IPAddressObserver
     77   virtual void OnIPAddressChanged();
     78 
     79   GURL redirect_origin_;
     80   ScopedRunnableMethodFactory<IntranetRedirectDetector> fetcher_factory_;
     81   Fetchers fetchers_;
     82   std::vector<GURL> resulting_origins_;
     83   bool in_sleep_;  // True if we're in the seven-second "no fetching" period
     84                    // that begins at browser start, or the one-second "no
     85                    // fetching" period that begins after network switches.
     86 
     87   DISALLOW_COPY_AND_ASSIGN(IntranetRedirectDetector);
     88 };
     89 
     90 // This is for use in testing, where we don't want our fetches to actually go
     91 // over the network.  It captures the requests and causes them to fail.
     92 class IntranetRedirectHostResolverProc : public net::HostResolverProc {
     93  public:
     94   explicit IntranetRedirectHostResolverProc(net::HostResolverProc* previous);
     95 
     96   virtual int Resolve(const std::string& host,
     97                       net::AddressFamily address_family,
     98                       net::HostResolverFlags host_resolver_flags,
     99                       net::AddressList* addrlist,
    100                       int* os_error);
    101 };
    102 
    103 #endif  // CHROME_BROWSER_INTRANET_REDIRECT_DETECTOR_H_
    104