chromeos/network/network_connection_handler.h

   1 // Copyright (c) 2012 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 CHROMEOS_NETWORK_NETWORK_CONNECTION_HANDLER_H_
   6 #define CHROMEOS_NETWORK_NETWORK_CONNECTION_HANDLER_H_
   7
   8 #include <map>
   9 #include <set>
  10 #include <string>
  11
  12 #include "base/basictypes.h"
  13 #include "base/callback.h"
  14 #include "base/memory/weak_ptr.h"
  15 #include "base/observer_list.h"
  16 #include "base/time/time.h"
  17 #include "base/values.h"
  18 #include "chromeos/cert_loader.h"
  19 #include "chromeos/chromeos_export.h"
  20 #include "chromeos/dbus/dbus_method_call_status.h"
  21 #include "chromeos/login/login_state.h"
  22 #include "chromeos/network/network_connection_observer.h"
  23 #include "chromeos/network/network_handler.h"
  24 #include "chromeos/network/network_handler_callbacks.h"
  25 #include "chromeos/network/network_state_handler_observer.h"
  26
  27 namespace chromeos {
  28
  29 class NetworkState;
  30
  31 // The NetworkConnectionHandler class is used to manage network connection
  32 // requests. This is the only class that should make Shill Connect calls.
  33 // It handles the following steps:
  34 // 1. Determine whether or not sufficient information (e.g. passphrase) is
  35 //    known to be available to connect to the network.
  36 // 2. Request additional information (e.g. user data which contains certificate
  37 //    information) and determine whether sufficient information is available.
  38 // 3. Possibly configure the network certificate info (tpm slot and pkcs11 id).
  39 // 4. Send the connect request.
  40 // 5. Wait for the network state to change to a non connecting state.
  41 // 6. Invoke the appropriate callback (always) on success or failure.
  42 //
  43 // NetworkConnectionHandler depends on NetworkStateHandler for immediately
  44 // available State information, and NetworkConfigurationHandler for any
  45 // configuration calls.
  46
  47 class CHROMEOS_EXPORT NetworkConnectionHandler
  48     : public LoginState::Observer,
  49       public CertLoader::Observer,
  50       public NetworkStateHandlerObserver,
  51       public base::SupportsWeakPtr<NetworkConnectionHandler> {
  52  public:
  53   // Constants for |error_name| from |error_callback| for Connect.
  54
  55   //  No network matching |service_path| is found (hidden networks must be
  56   //  configured before connecting).
  57   static const char kErrorNotFound[];
  58
  59   // Already connected to the network.
  60   static const char kErrorConnected[];
  61
  62   // Already connecting to the network.
  63   static const char kErrorConnecting[];
  64
  65   // The passphrase is missing or invalid.
  66   static const char kErrorPassphraseRequired[];
  67
  68   // The passphrase is incorrect.
  69   static const char kErrorBadPassphrase[];
  70
  71   // The network requires a cert and none exists.
  72   static const char kErrorCertificateRequired[];
  73
  74   // The network had an authentication error, indicating that additional or
  75   // different authentication information is required.
  76   static const char kErrorAuthenticationRequired[];
  77
  78   // Additional configuration is required.
  79   static const char kErrorConfigurationRequired[];
  80
  81   // Configuration failed during the configure stage of the connect flow.
  82   static const char kErrorConfigureFailed[];
  83
  84   // An unexpected DBus or Shill error occurred while connecting.
  85   static const char kErrorConnectFailed[];
  86
  87   // An unexpected DBus or Shill error occurred while disconnecting.
  88   static const char kErrorDisconnectFailed[];
  89
  90   // A new network connect request canceled this one.
  91   static const char kErrorConnectCanceled[];
  92
  93   // Constants for |error_name| from |error_callback| for Disconnect.
  94   static const char kErrorNotConnected[];
  95
  96   // Certificate load timed out.
  97   static const char kErrorCertLoadTimeout[];
  98
  99   ~NetworkConnectionHandler() override;
 100
 101   void AddObserver(NetworkConnectionObserver* observer);
 102   void RemoveObserver(NetworkConnectionObserver* observer);
 103
 104   // ConnectToNetwork() will start an asynchronous connection attempt.
 105   // On success, |success_callback| will be called.
 106   // On failure, |error_callback| will be called with |error_name| one of the
 107   //   constants defined above.
 108   // |error_message| will contain an additional error string for debugging.
 109   // If |check_error_state| is true, the current state of the network is
 110   //  checked for errors, otherwise current state is ignored (e.g. for recently
 111   //  configured networks or repeat attempts).
 112   void ConnectToNetwork(const std::string& service_path,
 113                         const base::Closure& success_callback,
 114                         const network_handler::ErrorCallback& error_callback,
 115                         bool check_error_state);
 116
 117   // DisconnectNetwork() will send a Disconnect request to Shill.
 118   // On success, |success_callback| will be called.
 119   // On failure, |error_callback| will be called with |error_name| one of:
 120   //  kErrorNotFound if no network matching |service_path| is found.
 121   //  kErrorNotConnected if not connected to the network.
 122   //  kErrorDisconnectFailed if a DBus or Shill error occurred.
 123   // |error_message| will contain and additional error string for debugging.
 124   void DisconnectNetwork(const std::string& service_path,
 125                          const base::Closure& success_callback,
 126                          const network_handler::ErrorCallback& error_callback);
 127
 128   // Returns true if ConnectToNetwork has been called with |service_path| and
 129   // has not completed (i.e. success or error callback has been called).
 130   bool HasConnectingNetwork(const std::string& service_path);
 131
 132   // Returns true if there are any pending connect requests.
 133   bool HasPendingConnectRequest();
 134
 135   // NetworkStateHandlerObserver
 136   void NetworkListChanged() override;
 137   void NetworkPropertiesUpdated(const NetworkState* network) override;
 138
 139   // LoginState::Observer
 140   void LoggedInStateChanged() override;
 141
 142   // CertLoader::Observer
 143   void OnCertificatesLoaded(const net::CertificateList& cert_list,
 144                             bool initial_load) override;
 145
 146  private:
 147   friend class NetworkHandler;
 148   friend class NetworkConnectionHandlerTest;
 149
 150   struct ConnectRequest;
 151
 152   NetworkConnectionHandler();
 153
 154   void Init(NetworkStateHandler* network_state_handler,
 155             NetworkConfigurationHandler* network_configuration_handler,
 156             ManagedNetworkConfigurationHandler*
 157                 managed_network_configuration_handler);
 158
 159   ConnectRequest* GetPendingRequest(const std::string& service_path);
 160
 161   // Callback from Shill.Service.GetProperties. Parses |properties| to verify
 162   // whether or not the network appears to be configured. If configured,
 163   // attempts a connection, otherwise invokes error_callback from
 164   // pending_requests_[service_path]. |check_error_state| is passed from
 165   // ConnectToNetwork(), see comment for info.
 166   void VerifyConfiguredAndConnect(bool check_error_state,
 167                                   const std::string& service_path,
 168                                   const base::DictionaryValue& properties);
 169
 170   // Queues a connect request until certificates have loaded.
 171   void QueueConnectRequest(const std::string& service_path);
 172
 173   // Checks to see if certificates have loaded and if not, cancels any queued
 174   // connect request and notifies the user.
 175   void CheckCertificatesLoaded();
 176
 177   // Handles connecting to a queued network after certificates are loaded or
 178   // handle cert load timeout.
 179   void ConnectToQueuedNetwork();
 180
 181   // Calls Shill.Manager.Connect asynchronously.
 182   void CallShillConnect(const std::string& service_path);
 183
 184   // Handles failure from ConfigurationHandler calls.
 185   void HandleConfigurationFailure(
 186       const std::string& service_path,
 187       const std::string& error_name,
 188       scoped_ptr<base::DictionaryValue> error_data);
 189
 190   // Handles success or failure from Shill.Service.Connect.
 191   void HandleShillConnectSuccess(const std::string& service_path);
 192   void HandleShillConnectFailure(const std::string& service_path,
 193                                  const std::string& error_name,
 194                                  const std::string& error_message);
 195
 196   void CheckPendingRequest(const std::string service_path);
 197   void CheckAllPendingRequests();
 198
 199   // Notify caller and observers that the connect request succeeded.
 200   void InvokeConnectSuccessCallback(const std::string& service_path,
 201                                     const base::Closure& success_callback);
 202
 203   // Look up the ConnectRequest for |service_path| and call
 204   // InvokeConnectErrorCallback.
 205   void ErrorCallbackForPendingRequest(const std::string& service_path,
 206                                       const std::string& error_name);
 207
 208   // Notify caller and observers that the connect request failed.
 209   // |error_name| will be one of the kError* messages defined above.
 210   void InvokeConnectErrorCallback(
 211       const std::string& service_path,
 212       const network_handler::ErrorCallback& error_callback,
 213       const std::string& error_name);
 214
 215   // Calls Shill.Manager.Disconnect asynchronously.
 216   void CallShillDisconnect(
 217       const std::string& service_path,
 218       const base::Closure& success_callback,
 219       const network_handler::ErrorCallback& error_callback);
 220
 221   // Handle success from Shill.Service.Disconnect.
 222   void HandleShillDisconnectSuccess(const std::string& service_path,
 223                                     const base::Closure& success_callback);
 224
 225   ObserverList<NetworkConnectionObserver> observers_;
 226
 227   // Local references to the associated handler instances.
 228   CertLoader* cert_loader_;
 229   NetworkStateHandler* network_state_handler_;
 230   NetworkConfigurationHandler* configuration_handler_;
 231   ManagedNetworkConfigurationHandler* managed_configuration_handler_;
 232
 233   // Map of pending connect requests, used to prevent repeated attempts while
 234   // waiting for Shill and to trigger callbacks on eventual success or failure.
 235   std::map<std::string, ConnectRequest> pending_requests_;
 236   scoped_ptr<ConnectRequest> queued_connect_;
 237
 238   // Track certificate loading state.
 239   bool logged_in_;
 240   bool certificates_loaded_;
 241   base::TimeTicks logged_in_time_;
 242
 243   DISALLOW_COPY_AND_ASSIGN(NetworkConnectionHandler);
 244 };
 245
 246 }  // namespace chromeos
 247
 248 #endif  // CHROMEOS_NETWORK_NETWORK_CONNECTION_HANDLER_H_