/*************************************************************************** * CVSID: $Id: hal-storage-mount.c,v 1.7 2006/06/21 00:44:03 david Exp $ * * hal-storage-mount.c : Mount wrapper * * Copyright (C) 2006 David Zeuthen, * * This program is free software; you can redistribute it and/or modify * it under the terms of the GNU General Public License as published by * the Free Software Foundation; either version 2 of the License, or * (at your option) any later version. * * This program is distributed in the hope that it will be useful, * but WITHOUT ANY WARRANTY; without even the implied warranty of * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the * GNU General Public License for more details. * * You should have received a copy of the GNU General Public License * along with this program; if not, write to the Free Software * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA * **************************************************************************/ #ifdef HAVE_CONFIG_H # include #endif #include #include #include #include #include #ifdef __FreeBSD__ #include #include #include #include #include #include #elif sun #include #include #include #else #include #endif #include #include #include #include #include #include "hal-storage-shared.h" #ifdef __FreeBSD__ struct mtab_handle { struct statfs *mounts; int n_mounts; int iter; }; #endif gboolean mtab_open (gpointer *handle) { #ifdef __FreeBSD__ struct mtab_handle *mtab; mtab = g_new0 (struct mtab_handle, 1); mtab->n_mounts = getmntinfo (&mtab->mounts, MNT_NOWAIT); if (mtab->n_mounts == 0) { g_free (mtab); return FALSE; } *handle = mtab; return TRUE; #elif sun *handle = fopen (MNTTAB, "r"); return *handle != NULL; #else *handle = fopen ("/proc/mounts", "r"); return *handle != NULL; #endif } char * mtab_next (gpointer handle, char **mount_point) { #ifdef __FreeBSD__ struct mtab_handle *mtab = handle; if (mtab->iter < mtab->n_mounts) { if (mount_point != NULL) { *mount_point = g_strdup (mtab->mounts[mtab->iter].f_mntonname); } return mtab->mounts[mtab->iter++].f_mntfromname; } else { return NULL; } #elif sun static struct mnttab mnt; if (getmntent (handle, &mnt) == 0) { if (mount_point != NULL) { *mount_point = g_strdup (mnt.mnt_mountp); } return mnt.mnt_special; } else { return NULL; } #else struct mntent *mnt; mnt = getmntent (handle); if (mnt != NULL) { if (mount_point != NULL) { *mount_point = g_strdup (mnt->mnt_dir); } return mnt->mnt_fsname; } else { return NULL; } #endif } void mtab_close (gpointer handle) { #ifdef __FreeBSD__ g_free (handle); #else fclose (handle); #endif } gboolean fstab_open (gpointer *handle) { #ifdef __FreeBSD__ return setfsent () == 1; #elif sun *handle = fopen (VFSTAB, "r"); return *handle != NULL; #else *handle = fopen ("/etc/fstab", "r"); return *handle != NULL; #endif } char * fstab_next (gpointer handle, char **mount_point) { #ifdef __FreeBSD__ struct fstab *fstab; fstab = getfsent (); /* TODO: fill out mount_point */ if (mount_point != NULL && fstab != NULL) { *mount_point = fstab->fs_file; } return fstab ? fstab->fs_spec : NULL; #elif sun static struct vfstab v; return getvfsent (handle, &v) == 0 ? v.vfs_special : NULL; #else struct mntent *mnt; mnt = getmntent (handle); if (mount_point != NULL && mnt != NULL) { *mount_point = mnt->mnt_dir; } return mnt ? mnt->mnt_fsname : NULL; #endif } void fstab_close (gpointer handle) { #ifdef __FreeBSD__ endfsent (); #else fclose (handle); #endif } #ifdef __FreeBSD__ #define UMOUNT "/sbin/umount" #elif sun #define UMOUNT "/sbin/umount" #else #define UMOUNT "/bin/umount" #endif void bailout_if_drive_is_locked (LibHalContext *hal_ctx, LibHalDrive *drive, const char *invoked_by_syscon_name) { DBusError error; if (drive != NULL && invoked_by_syscon_name != NULL) { dbus_error_init (&error); if (libhal_device_is_caller_locked_out (hal_ctx, libhal_drive_get_udi (drive), "org.freedesktop.Hal.Device.Storage", invoked_by_syscon_name, &error)) { fprintf (stderr, "org.freedesktop.Hal.Device.InterfaceLocked\n"); fprintf (stderr, "The enclosing drive for the volume is locked\n"); exit (1); } } } void unknown_error (const char *detail) { fprintf (stderr, "org.freedesktop.Hal.Device.Volume.UnknownFailure\n"); fprintf (stderr, "%s\n", detail); exit (1); } static void device_busy (const char *detail) { fprintf (stderr, "org.freedesktop.Hal.Device.Volume.Busy\n"); fprintf (stderr, "%s\n", detail); exit (1); } static void not_mounted (const char *detail) { fprintf (stderr, "org.freedesktop.Hal.Device.Volume.NotMounted\n"); fprintf (stderr, "%s\n", detail); exit (1); } static void not_mounted_by_hal (const char *detail) { fprintf (stderr, "org.freedesktop.Hal.Device.Volume.NotMountedByHal\n"); fprintf (stderr, "%s\n", detail); exit (1); } static void permission_denied_privilege (const char *privilege, const char *result) { fprintf (stderr, "org.freedesktop.Hal.Device.PermissionDeniedByPolicy\n"); fprintf (stderr, "%s %s <-- (privilege, result)\n", privilege, result); exit (1); } static void permission_denied_volume_ignore (const char *device) { fprintf (stderr, "org.freedesktop.Hal.Device.Volume.PermissionDenied\n"); fprintf (stderr, "Device has %s volume.ignore set to TRUE. Refusing to mount.\n", device); exit (1); } void handle_unmount (LibHalContext *hal_ctx, const char *udi, LibHalVolume *volume, LibHalDrive *drive, const char *device, const char *invoked_by_uid, const char *invoked_by_syscon_name, gboolean option_lazy, gboolean option_force) { int i, j; DBusError error; GError *err = NULL; char *sout = NULL; char *serr = NULL; int exit_status; char *args[10]; int na; FILE *hal_mtab_orig; int hal_mtab_orig_len; int num_read; char *hal_mtab_buf; char **lines; char *mount_point_to_unmount; gboolean mounted_by_other_uid; FILE *hal_mtab_new; #ifdef DEBUG printf ("device = %s\n", device); printf ("invoked by uid = %s\n", invoked_by_uid); printf ("invoked by system bus connection = %s\n", invoked_by_syscon_name); #endif if (volume != NULL) { dbus_error_init (&error); if (libhal_device_get_property_bool (hal_ctx, udi, "volume.ignore", &error)) { permission_denied_volume_ignore (device); } if (dbus_error_is_set (&error)) { dbus_error_free(&error); unknown_error("Error while get volume.ignore"); } if (!libhal_volume_is_mounted (volume)) { not_mounted ("According to HAL, the volume is not mounted"); } } bailout_if_drive_is_locked (hal_ctx, drive, invoked_by_syscon_name); /* check hal's mtab file to verify the device to unmount is actually mounted by hal */ hal_mtab_orig = fopen ("/media/.hal-mtab", "r"); if (hal_mtab_orig == NULL) { unknown_error ("Cannot open /media/.hal-mtab"); } if (fseek (hal_mtab_orig, 0L, SEEK_END) != 0) { unknown_error ("Cannot seek to end of /media/.hal-mtab"); } hal_mtab_orig_len = ftell (hal_mtab_orig); if (hal_mtab_orig_len < 0) { unknown_error ("Cannot determine size of /media/.hal-mtab"); } rewind (hal_mtab_orig); hal_mtab_buf = g_new0 (char, hal_mtab_orig_len + 1); num_read = fread (hal_mtab_buf, 1, hal_mtab_orig_len, hal_mtab_orig); if (num_read != hal_mtab_orig_len) { unknown_error ("Cannot read from /media/.hal-mtab"); } fclose (hal_mtab_orig); #ifdef DEBUG printf ("hal_mtab = '%s'\n", hal_mtab_buf); #endif lines = g_strsplit (hal_mtab_buf, "\n", 0); g_free (hal_mtab_buf); mount_point_to_unmount = NULL; mounted_by_other_uid = TRUE; /* find the entry we're going to unmount */ for (i = 0; lines[i] != NULL; i++) { char **line_elements; #ifdef DEBUG printf (" line = '%s'\n", lines[i]); #endif if ((lines[i])[0] == '#') continue; line_elements = g_strsplit (lines[i], "\t", 6); if (g_strv_length (line_elements) == 6) { #ifdef DEBUG printf (" devfile = '%s'\n", line_elements[0]); printf (" uid = '%s'\n", line_elements[1]); printf (" session id = '%s'\n", line_elements[2]); printf (" fs = '%s'\n", line_elements[3]); printf (" options = '%s'\n", line_elements[4]); printf (" mount_point = '%s'\n", line_elements[5]); #endif if (strcmp (line_elements[0], device) == 0) { char *line_to_free; if (strcmp (line_elements[1], invoked_by_uid) == 0) mounted_by_other_uid = FALSE; mount_point_to_unmount = g_strdup (line_elements[5]); line_to_free = lines[i]; for (j = i; lines[j] != NULL; j++) { lines[j] = lines[j+1]; } lines[j] = NULL; g_free (line_to_free); g_strfreev (line_elements); goto line_found; } } g_strfreev (line_elements); } line_found: if (mount_point_to_unmount == NULL) { not_mounted_by_hal ("Device to unmount is not in /media/.hal-mtab so it is not mounted by HAL"); } /* NOTE: it doesn't make sense to require a privilege a'la * "hal-storage-unmount" because we only allow user to unmount * volumes mounted by himself in the first place... and it * would be odd to allow Mount() but disallow Unmount()... */ /* if mounted_by_other_uid==TRUE: bail out, unless if we got the * "hal-storage-unmount-volumes-mounted-by-others" * * We allow uid 0 to actually ensure that Unmount(options=["lazy"], "/dev/blah") works from addon-storage. */ if ((strcmp (invoked_by_uid, "0") != 0) && mounted_by_other_uid) { const char *action = "hal-storage-unmount-others"; #ifdef HAVE_POLKIT if (invoked_by_syscon_name != NULL) { char *polkit_result; dbus_error_init (&error); polkit_result = libhal_device_is_caller_privileged (hal_ctx, udi, action, NULL, /* TODO: FIXME: */ invoked_by_syscon_name, &error); if (polkit_result == NULL){ unknown_error ("IsCallerPrivileged() failed"); } if (strcmp (polkit_result, "yes") != 0) { permission_denied_privilege (action, polkit_result); } libhal_free_string (polkit_result); } #else permission_denied_privilege (privilege, "no"); #endif } /* create new .hal-mtab~ file without the entry we're going to unmount */ hal_mtab_new = fopen ("/media/.hal-mtab~", "w"); if (hal_mtab_new == NULL) { unknown_error ("Cannot create /media/.hal-mtab~"); } for (i = 0; lines[i] != NULL; i++) { if (i > 0) { char anewl[2] = "\n\0"; if (fwrite (anewl, 1, 1, hal_mtab_new) != 1) { unknown_error ("Cannot write to /media/.hal-mtab~"); } } if (fwrite (lines[i], 1, strlen (lines[i]), hal_mtab_new) != strlen (lines[i])) { unknown_error ("Cannot write to /media/.hal-mtab~"); } } fclose (hal_mtab_new); g_strfreev (lines); /* construct arguments to /bin/umount */ na = 0; args[na++] = UMOUNT; if (option_lazy) args[na++] = "-l"; if (option_force) args[na++] = "-f"; args[na++] = (char *) device; args[na++] = NULL; #ifdef DEBUG printf ("will umount %s (mounted at '%s'), mounted_by_other_uid=%d\n", device, mount_point_to_unmount, mounted_by_other_uid); #endif /* invoke /bin/umount */ if (!g_spawn_sync ("/", args, NULL, 0, NULL, NULL, &sout, &serr, &exit_status, &err)) { printf ("Cannot execute %s\n", UMOUNT); unlink ("/media/.hal-mtab~"); unknown_error ("Cannot spawn " UMOUNT); } /* check if unmount was succesful */ if (exit_status != 0) { printf ("%s error %d, stdout='%s', stderr='%s'\n", UMOUNT, exit_status, sout, serr); if (strstr (serr, "device is busy") != NULL) { unlink ("/media/.hal-mtab~"); device_busy (serr); } else { unlink ("/media/.hal-mtab~"); unknown_error (serr); } } /* unmount was succesful, remove directory we created in Mount() */ if (g_rmdir (mount_point_to_unmount) != 0) { unlink ("/media/.hal-mtab~"); unknown_error ("Cannot remove directory"); } /* set new .hal-mtab file */ if (rename ("/media/.hal-mtab~", "/media/.hal-mtab") != 0) { unlink ("/media/.hal-mtab~"); unknown_error ("Cannot rename /media/.hal-mtab~ to /media/.hal-mtab"); } #ifdef DEBUG printf ("done unmounting\n"); #endif openlog ("hald", 0, LOG_DAEMON); syslog (LOG_INFO, "unmounted %s from '%s' on behalf of uid %s", device, mount_point_to_unmount, invoked_by_uid); closelog (); g_free (sout); g_free (serr); g_free (mount_point_to_unmount); } void handle_eject (LibHalContext *hal_ctx, const char *udi, LibHalDrive *drive, const char *device, const char *invoked_by_uid, const char *invoked_by_syscon_name, gboolean closetray) { GError *err = NULL; char *sout = NULL; char *serr = NULL; int exit_status; char *args[10]; int na; int fd; int num_excl_tries; DBusError error; /* When called here all the file systems from this device is * already unmounted. That's actually guaranteed; see * tools/hal-storage-eject.c for details. * * Next thing to check is that we can open the device * exclusively; if we can't, it means that some app is holding * a file descriptor open using O_EXCL (we've already unmounted * all file systems). * * And that means our polling won't work. Thus ejecting the * disc will mean that the hal device database isn't * updated. * * Sigh. * * So better check that we can we can open O_EXCL. * * This is RH #207177 - https://bugzilla.redhat.com/bugzilla/show_bug.cgi?id=207177 * * Credit goes to Bill Nottingham for suggesting this check. */ num_excl_tries = 5; try_open_excl_again: fd = open (device, O_RDONLY | O_NONBLOCK | O_EXCL); if (fd < 0 && errno == EBUSY) { /* Hey, so this might just be because we're colliding * with the polling addon that also opens O_EXCL. We * know this only every two seconds (or less frequent) * so try to open the device a few times... */ usleep (100 * 1000); /* sleep 100 ms between each attempt */ if (num_excl_tries-- > 0) goto try_open_excl_again; /* Some other app, like gnome-cd, has already opened with O_EXCL. Refuse to eject. */ device_busy ("Some application is using the device"); } close (fd); #ifdef HAVE_POLKIT if (invoked_by_syscon_name != NULL) { char *polkit_result; const char *action = "hal-storage-eject"; dbus_error_init (&error); polkit_result = libhal_device_is_caller_privileged (hal_ctx, udi, action, NULL, invoked_by_syscon_name, &error); if (polkit_result == NULL){ unknown_error ("IsCallerPrivileged() failed"); } if (strcmp (polkit_result, "yes") != 0) { permission_denied_privilege (action, polkit_result); } libhal_free_string (polkit_result); } #endif #ifdef DEBUG printf ("device = %s\n", device); printf ("invoked by uid = %s\n", invoked_by_uid); printf ("invoked by system bus connection = %s\n", invoked_by_syscon_name); #endif bailout_if_drive_is_locked (hal_ctx, drive, invoked_by_syscon_name); /* construct arguments to EJECT_PROGRAM (e.g. /usr/bin/eject) */ na = 0; args[na++] = EJECT_PROGRAM; if (closetray) { args[na++] = "-t"; } args[na++] = (char *) device; args[na++] = NULL; #ifdef DEBUG printf ("will eject %s\n", device); #endif /* invoke eject command */ if (!g_spawn_sync ("/", args, NULL, 0, NULL, NULL, &sout, &serr, &exit_status, &err)) { printf ("Cannot execute %s\n", EJECT_PROGRAM); unknown_error ("Cannot spawn " EJECT_PROGRAM); } /* check if eject was succesful */ if (exit_status != 0) { printf ("%s error %d, stdout='%s', stderr='%s'\n", EJECT_PROGRAM, exit_status, sout, serr); unknown_error (serr); } /* eject was succesful... */ #ifdef DEBUG printf ("done ejecting\n"); #endif g_free (sout); g_free (serr); } static int lock_mtab_fd = -1; gboolean lock_hal_mtab (void) { if (lock_mtab_fd >= 0) return TRUE; printf ("%d: XYA attempting to get lock on /media/.hal-mtab-lock\n", getpid ()); lock_mtab_fd = open ("/media/.hal-mtab-lock", O_CREAT | O_RDWR); /* TODO: set correct mode, owner etc. */ if (lock_mtab_fd < 0) return FALSE; tryagain: #if sun if (lockf (lock_mtab_fd, F_LOCK, 0) != 0) { #else if (flock (lock_mtab_fd, LOCK_EX) != 0) { #endif if (errno == EINTR) goto tryagain; return FALSE; } printf ("%d: XYA got lock on /media/.hal-mtab-lock\n", getpid ()); return TRUE; } void unlock_hal_mtab (void) { #if sun lockf (lock_mtab_fd, F_ULOCK, 0); #else flock (lock_mtab_fd, LOCK_UN); #endif close (lock_mtab_fd); lock_mtab_fd = -1; printf ("%d: XYA released lock on /media/.hal-mtab-lock\n", getpid ()); }