gio/gwin32volumemonitor.c

   1 /* GIO - GLib Input, Output and Streaming Library
   2  *
   3  * Copyright (C) 2006-2007 Red Hat, Inc.
   4  * Copyright (C) 2008 Hans Breuer
   5  *
   6  * This library is free software; you can redistribute it and/or
   7  * modify it under the terms of the GNU Lesser General Public
   8  * License as published by the Free Software Foundation; either
   9  * version 2 of the License, or (at your option) any later version.
  10  *
  11  * This library is distributed in the hope that it will be useful,
  12  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  13  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  14  * Lesser General Public License for more details.
  15  *
  16  * You should have received a copy of the GNU Lesser General
  17  * Public License along with this library; if not, write to the
  18  * Free Software Foundation, Inc., 59 Temple Place, Suite 330,
  19  * Boston, MA 02111-1307, USA.
  20  *
  21  * Author: Alexander Larsson <alexl@redhat.com>
  22  *         David Zeuthen <davidz@redhat.com>
  23  *         Hans Breuer <hans@breuer.org>
  24  */
  25
  26 #include "config.h"
  27
  28 #include <string.h>
  29
  30 #include <glib.h>
  31 #include "glibintl.h"
  32
  33 #include "gwin32volumemonitor.h"
  34 #include "gwin32mount.h"
  35 #include "gmount.h"
  36 #include "giomodule.h"
  37
  38 #define _WIN32_WINNT 0x0500
  39 #include <windows.h>
  40
  41 struct _GWin32VolumeMonitor {
  42   GNativeVolumeMonitor parent;
  43
  44   GList *volumes;
  45   GList *mounts;
  46 };
  47
  48 #define g_win32_volume_monitor_get_type _g_win32_volume_monitor_get_type
  49 G_DEFINE_TYPE_WITH_CODE (GWin32VolumeMonitor, g_win32_volume_monitor, G_TYPE_NATIVE_VOLUME_MONITOR,
  50                          g_io_extension_point_implement (G_NATIVE_VOLUME_MONITOR_EXTENSION_POINT_NAME,
  51                                                          g_define_type_id,
  52                                                          "win32",
  53                                                          0));
  54
  55 static void
  56 g_win32_volume_monitor_finalize (GObject *object)
  57 {
  58   GWin32VolumeMonitor *monitor;
  59
  60   monitor = G_WIN32_VOLUME_MONITOR (object);
  61
  62   if (G_OBJECT_CLASS (g_win32_volume_monitor_parent_class)->finalize)
  63     (*G_OBJECT_CLASS (g_win32_volume_monitor_parent_class)->finalize) (object);
  64 }
  65
  66 /*
  67  * get_viewable_logical_drives:
  68  *
  69  * Returns the list of logical and viewable drives as defined by
  70  * GetLogicalDrives() and the registry keys
  71  * Software\Microsoft\Windows\CurrentVersion\Policies\Explorer under
  72  * HKLM or HKCU. If neither key exists the result of
  73  * GetLogicalDrives() is returned.
  74  *
  75  * Return value: bitmask with same meaning as returned by GetLogicalDrives()
  76  */
  77 static guint32
  78 get_viewable_logical_drives (void)
  79 {
  80   guint viewable_drives = GetLogicalDrives ();
  81   HKEY key;
  82
  83   DWORD var_type = REG_DWORD; //the value's a REG_DWORD type
  84   DWORD no_drives_size = 4;
  85   DWORD no_drives;
  86   gboolean hklm_present = FALSE;
  87
  88   if (RegOpenKeyEx (HKEY_LOCAL_MACHINE,
  89                     "Software\\Microsoft\\Windows\\"
  90                     "CurrentVersion\\Policies\\Explorer",
  91                     0, KEY_READ, &key) == ERROR_SUCCESS)
  92     {
  93       if (RegQueryValueEx (key, "NoDrives", NULL, &var_type,
  94                            (LPBYTE) &no_drives, &no_drives_size) == ERROR_SUCCESS)
  95         {
  96           /* We need the bits that are set in viewable_drives, and
  97            * unset in no_drives.
  98            */
  99           viewable_drives = viewable_drives & ~no_drives;
 100           hklm_present = TRUE;
 101         }
 102       RegCloseKey (key);
 103     }
 104
 105   /* If the key is present in HKLM then the one in HKCU should be ignored */
 106   if (!hklm_present)
 107     {
 108       if (RegOpenKeyEx (HKEY_CURRENT_USER,
 109                         "Software\\Microsoft\\Windows\\"
 110                         "CurrentVersion\\Policies\\Explorer",
 111                         0, KEY_READ, &key) == ERROR_SUCCESS)
 112         {
 113           if (RegQueryValueEx (key, "NoDrives", NULL, &var_type,
 114                                (LPBYTE) &no_drives, &no_drives_size) == ERROR_SUCCESS)
 115             {
 116               viewable_drives = viewable_drives & ~no_drives;
 117             }
 118           RegCloseKey (key);
 119         }
 120     }
 121
 122   return viewable_drives;
 123 }
 124
 125 /* deliver accesible (aka 'mounted') volumes */
 126 static GList *
 127 get_mounts (GVolumeMonitor *volume_monitor)
 128 {
 129   GWin32VolumeMonitor *monitor;
 130   DWORD   drives;
 131   gchar   drive[4] = "A:\\";
 132   GList *list = NULL;
 133
 134   monitor = G_WIN32_VOLUME_MONITOR (volume_monitor);
 135
 136   drives = get_viewable_logical_drives ();
 137
 138   if (!drives)
 139     g_warning ("get_viewable_logical_drives failed.");
 140
 141   while (drives && drive[0] <= 'Z')
 142     {
 143       if (drives & 1)
 144       {
 145         list = g_list_prepend (list, _g_win32_mount_new (volume_monitor, drive, NULL));
 146       }
 147       drives >>= 1;
 148       drive[0]++;
 149     }
 150   return list;
 151 }
 152
 153 /* actually 'mounting' volumes is out of GIOs business on win32, so no volumes are delivered either */
 154 static GList *
 155 get_volumes (GVolumeMonitor *volume_monitor)
 156 {
 157   GWin32VolumeMonitor *monitor;
 158   GList *l = NULL;
 159
 160   monitor = G_WIN32_VOLUME_MONITOR (volume_monitor);
 161
 162   return l;
 163 }
 164
 165 /* real hardware */
 166 static GList *
 167 get_connected_drives (GVolumeMonitor *volume_monitor)
 168 {
 169   GWin32VolumeMonitor *monitor;
 170   HANDLE  find_handle;
 171   BOOL    found;
 172   wchar_t wc_name[MAX_PATH+1];
 173   GList *list = NULL;
 174
 175   monitor = G_WIN32_VOLUME_MONITOR (volume_monitor);
 176
 177 #if 0
 178   find_handle = FindFirstVolumeW (wc_name, MAX_PATH);
 179   found = (find_handle != INVALID_HANDLE_VALUE);
 180   while (found)
 181     {
 182       /* I don't know what this code is supposed to do; clearly it now
 183        * does nothing, the returned GList is always NULL. But what was
 184        * this code supposed to be a start of? The volume names that
 185        * the FindFirstVolume/FindNextVolume loop iterates over returns
 186        * device names like
 187        *
 188        *   \Device\HarddiskVolume1
 189        *   \Device\HarddiskVolume2
 190        *   \Device\CdRom0
 191        *
 192        * No DOS devices there, so I don't see the point with the
 193        * QueryDosDevice call below. Probably this code is confusing volumes
 194        * with something else that does contain the mapping from DOS devices
 195        * to volumes.
 196        */
 197       wchar_t wc_dev_name[MAX_PATH+1];
 198       guint trailing = wcslen (wc_name) - 1;
 199
 200       /* remove trailing backslash and leading \\?\\ */
 201       wc_name[trailing] = L'\0';
 202       if (QueryDosDeviceW (&wc_name[4], wc_dev_name, MAX_PATH))
 203         {
 204           gchar *name = g_utf16_to_utf8 (wc_dev_name, -1, NULL, NULL, NULL);
 205           g_print ("%s\n", name);
 206           g_free (name);
 207         }
 208
 209       found = FindNextVolumeW (find_handle, wc_name, MAX_PATH);
 210     }
 211   if (find_handle != INVALID_HANDLE_VALUE)
 212     FindVolumeClose (find_handle);
 213 #endif
 214
 215   return list;
 216 }
 217
 218 static GVolume *
 219 get_volume_for_uuid (GVolumeMonitor *volume_monitor, const char *uuid)
 220 {
 221   return NULL;
 222 }
 223
 224 static GMount *
 225 get_mount_for_uuid (GVolumeMonitor *volume_monitor, const char *uuid)
 226 {
 227   return NULL;
 228 }
 229
 230 static gboolean
 231 is_supported (void)
 232 {
 233   return TRUE;
 234 }
 235
 236 static GMount *
 237 get_mount_for_mount_path (const char *mount_path,
 238                           GCancellable *cancellable)
 239 {
 240   GWin32Mount *mount;
 241
 242   /* TODO: Set mountable volume? */
 243   mount = _g_win32_mount_new (NULL, mount_path, NULL);
 244
 245   return G_MOUNT (mount);
 246 }
 247
 248 static void
 249 g_win32_volume_monitor_class_init (GWin32VolumeMonitorClass *klass)
 250 {
 251   GObjectClass *gobject_class = G_OBJECT_CLASS (klass);
 252   GVolumeMonitorClass *monitor_class = G_VOLUME_MONITOR_CLASS (klass);
 253   GNativeVolumeMonitorClass *native_class = G_NATIVE_VOLUME_MONITOR_CLASS (klass);
 254
 255   gobject_class->finalize = g_win32_volume_monitor_finalize;
 256
 257   monitor_class->get_mounts = get_mounts;
 258   monitor_class->get_volumes = get_volumes;
 259   monitor_class->get_connected_drives = get_connected_drives;
 260   monitor_class->get_volume_for_uuid = get_volume_for_uuid;
 261   monitor_class->get_mount_for_uuid = get_mount_for_uuid;
 262   monitor_class->is_supported = is_supported;
 263
 264   native_class->get_mount_for_mount_path = get_mount_for_mount_path;
 265 }
 266
 267 static void
 268 g_win32_volume_monitor_init (GWin32VolumeMonitor *win32_monitor)
 269 {
 270   /* maybe we shoud setup a callback window to listern for WM_DEVICECHANGE ? */
 271 #if 0
 272   unix_monitor->mount_monitor = g_win32_mount_monitor_new ();
 273
 274   g_signal_connect (win32_monitor->mount_monitor,
 275                     "mounts-changed", G_CALLBACK (mounts_changed),
 276                     win32_monitor);
 277
 278   g_signal_connect (win32_monitor->mount_monitor,
 279                     "mountpoints-changed", G_CALLBACK (mountpoints_changed),
 280                     win32_monitor);
 281
 282   update_volumes (win32_monitor);
 283   update_mounts (win32_monitor);
 284 #endif
 285 }