usr/src/cmd/hal/tools/hal-storage-unmount.c

   1 /***************************************************************************
   2  * CVSID: $Id$
   3  *
   4  * hal-storage-unmount.c : Unmount wrapper
   5  *
   6  * Copyright (C) 2006 David Zeuthen, <david@fubar.dk>
   7  *
   8  * This program is free software; you can redistribute it and/or modify
   9  * it under the terms of the GNU General Public License as published by
  10  * the Free Software Foundation; either version 2 of the License, or
  11  * (at your option) any later version.
  12  *
  13  * This program is distributed in the hope that it will be useful,
  14  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  15  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  16  * GNU General Public License for more details.
  17  *
  18  * You should have received a copy of the GNU General Public License
  19  * along with this program; if not, write to the Free Software
  20  * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA
  21  *
  22  **************************************************************************/
  23
  24
  25 #ifdef HAVE_CONFIG_H
  26 #  include <config.h>
  27 #endif
  28
  29 #include <stdio.h>
  30 #include <stdlib.h>
  31 #include <string.h>
  32 #include <glib.h>
  33 #include <glib/gstdio.h>
  34 #ifdef __FreeBSD__
  35 #include <fstab.h>
  36 #include <sys/param.h>
  37 #include <sys/ucred.h>
  38 #include <sys/mount.h>
  39 #include <limits.h>
  40 #include <pwd.h>
  41 #elif sun
  42 #include <fcntl.h>
  43 #include <sys/mnttab.h>
  44 #include <sys/vfstab.h>
  45 #else
  46 #include <mntent.h>
  47 #endif
  48 #include <sys/types.h>
  49 #include <unistd.h>
  50
  51 #include <libhal.h>
  52 #include <libhal-storage.h>
  53 #ifdef HAVE_POLKIT
  54 #include <libpolkit.h>
  55 #endif
  56
  57 #include "hal-storage-shared.h"
  58
  59
  60 static void
  61 usage (void)
  62 {
  63         fprintf (stderr, "This program should only be started by hald.\n");
  64         exit (1);
  65 }
  66
  67 static void
  68 invalid_unmount_option (const char *option, const char *uid)
  69 {
  70         fprintf (stderr, "org.freedesktop.Hal.Device.Volume.InvalidUnmountOption\n");
  71         fprintf (stderr, "The option '%s' is not allowed for uid=%s\n", option, uid);
  72         exit (1);
  73 }
  74
  75 int
  76 main (int argc, char *argv[])
  77 {
  78         char *udi;
  79         char *device;
  80         LibHalVolume *volume;
  81         DBusError error;
  82         LibHalContext *hal_ctx = NULL;
  83         DBusConnection *system_bus = NULL;
  84 #ifdef HAVE_POLKIT
  85         LibPolKitContext *pol_ctx = NULL;
  86 #endif
  87         char *invoked_by_uid;
  88         char *invoked_by_syscon_name;
  89         int i;
  90         char unmount_options[1024];
  91         char **given_options;
  92         gboolean use_lazy;
  93         gboolean use_force;
  94         const char *end;
  95
  96         if (!lock_hal_mtab ()) {
  97                 unknown_error ("Cannot obtain lock on /media/.hal-mtab");
  98         }
  99
 100         device = getenv ("HAL_PROP_BLOCK_DEVICE");
 101         if (device == NULL)
 102                 usage ();
 103
 104         udi = getenv ("HAL_PROP_INFO_UDI");
 105         if (udi == NULL)
 106                 usage ();
 107
 108         invoked_by_uid = getenv ("HAL_METHOD_INVOKED_BY_UID");
 109
 110         invoked_by_syscon_name = getenv ("HAL_METHOD_INVOKED_BY_SYSTEMBUS_CONNECTION_NAME");
 111
 112         dbus_error_init (&error);
 113         if ((hal_ctx = libhal_ctx_init_direct (&error)) == NULL) {
 114                 printf ("Cannot connect to hald\n");
 115                 LIBHAL_FREE_DBUS_ERROR (&error);
 116                 usage ();
 117         }
 118
 119         dbus_error_init (&error);
 120         system_bus = dbus_bus_get (DBUS_BUS_SYSTEM, &error);
 121         if (system_bus == NULL) {
 122                 printf ("Cannot connect to the system bus\n");
 123                 LIBHAL_FREE_DBUS_ERROR (&error);
 124                 usage ();
 125         }
 126 #ifdef HAVE_POLKIT
 127         pol_ctx = libpolkit_new_context (system_bus);
 128         if (pol_ctx == NULL) {
 129                 printf ("Cannot get libpolkit context\n");
 130                 unknown_error ("Cannot get libpolkit context");
 131         }
 132 #endif
 133
 134         /* read from stdin */
 135         if (strlen (fgets (unmount_options, sizeof (unmount_options), stdin)) > 0)
 136                 unmount_options [strlen (unmount_options) - 1] = '\0';
 137         /* validate that input from stdin is UTF-8 */
 138         if (!g_utf8_validate (unmount_options, -1, &end))
 139                 unknown_error ("Error validating unmount_options as UTF-8");
 140 #ifdef DEBUG
 141         printf ("unmount_options  = '%s'\n", unmount_options);
 142 #endif
 143
 144         /* delete any trailing whitespace options from splitting the string */
 145         given_options = g_strsplit (unmount_options, "\t", 0);
 146         for (i = g_strv_length (given_options) - 1; i >= 0; --i) {
 147                 if (strlen (given_options[i]) > 0)
 148                         break;
 149                 given_options[i] = NULL;
 150         }
 151
 152         use_lazy = FALSE;
 153         use_force = FALSE;
 154
 155         /* check unmount options */
 156         for (i = 0; given_options[i] != NULL; i++) {
 157                 char *given = given_options[i];
 158
 159                 if (strcmp (given, "lazy") == 0) {
 160                         use_lazy = TRUE;
 161                 } else if (strcmp (given, "force") == 0) {
 162                         use_force = TRUE;
 163                 } else {
 164                         invalid_unmount_option (given, invoked_by_uid);
 165                 }
 166         }
 167         g_strfreev (given_options);
 168
 169
 170         volume = libhal_volume_from_udi (hal_ctx, udi);
 171         if (volume == NULL) {
 172                 LibHalDrive *drive;
 173
 174                 drive = libhal_drive_from_udi (hal_ctx, udi);
 175                 if (drive == NULL) {
 176                         usage ();
 177                 } else {
 178                         handle_unmount (hal_ctx,
 179 #ifdef HAVE_POLKIT
 180                                         pol_ctx,
 181 #endif
 182                                         udi, NULL, drive, device, invoked_by_uid,
 183                                         invoked_by_syscon_name, use_lazy, use_force,
 184                                         system_bus);
 185                 }
 186
 187         } else {
 188                 const char *drive_udi;
 189                 LibHalDrive *drive;
 190
 191                 drive_udi = libhal_volume_get_storage_device_udi (volume);
 192
 193                 if (drive_udi == NULL)
 194                         unknown_error ("Cannot get drive_udi from volume");
 195                 drive = libhal_drive_from_udi (hal_ctx, drive_udi);
 196                 if (drive == NULL)
 197                         unknown_error ("Cannot get drive from hal");
 198
 199                 handle_unmount (hal_ctx,
 200 #ifdef HAVE_POLKIT
 201                                 pol_ctx,
 202 #endif
 203                                 udi, volume, drive, device, invoked_by_uid,
 204                                 invoked_by_syscon_name, use_lazy, use_force,
 205                                 system_bus);
 206
 207         }
 208
 209         unlock_hal_mtab ();
 210
 211         return 0;
 212 }