459 lines
10 KiB
C
459 lines
10 KiB
C
/*
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* GRUB -- GRand Unified Bootloader
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* Copyright (C) 1999,2000,2001,2002,2003,2006,2007,2008,2009,2010,2011,2012,2013 Free Software Foundation, Inc.
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*
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* GRUB is free software: you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation, either version 3 of the License, or
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* (at your option) any later version.
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*
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* GRUB is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with GRUB. If not, see <http://www.gnu.org/licenses/>.
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*/
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#include <config-util.h>
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#include <config.h>
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#include <grub/emu/getroot.h>
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#include <grub/mm.h>
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#ifdef HAVE_DEVICE_MAPPER
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#include <sys/stat.h>
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#include <sys/types.h>
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#include <assert.h>
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#include <fcntl.h>
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#include <unistd.h>
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#include <string.h>
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#include <dirent.h>
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#include <errno.h>
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#include <error.h>
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#include <stdio.h>
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#include <stdlib.h>
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#include <stdint.h>
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#ifdef HAVE_LIMITS_H
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#include <limits.h>
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#endif
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#include <libdevmapper.h>
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#include <grub/types.h>
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#include <grub/util/misc.h>
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#include <grub/mm.h>
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#include <grub/misc.h>
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#include <grub/emu/misc.h>
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#include <grub/emu/hostdisk.h>
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static int
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grub_util_open_dm (const char *os_dev, struct dm_tree **tree,
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struct dm_tree_node **node)
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{
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uint32_t maj, min;
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struct stat st;
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*node = NULL;
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*tree = NULL;
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if (stat (os_dev, &st) < 0)
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return 0;
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maj = major (st.st_rdev);
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min = minor (st.st_rdev);
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if (!dm_is_dm_major (maj))
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return 0;
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*tree = dm_tree_create ();
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if (! *tree)
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{
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grub_puts_ (N_("Failed to create `device-mapper' tree"));
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grub_dprintf ("hostdisk", "dm_tree_create failed\n");
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return 0;
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}
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if (! dm_tree_add_dev (*tree, maj, min))
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{
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grub_dprintf ("hostdisk", "dm_tree_add_dev failed\n");
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dm_tree_free (*tree);
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*tree = NULL;
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return 0;
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}
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*node = dm_tree_find_node (*tree, maj, min);
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if (! *node)
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{
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grub_dprintf ("hostdisk", "dm_tree_find_node failed\n");
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dm_tree_free (*tree);
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*tree = NULL;
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return 0;
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}
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return 1;
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}
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static char *
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get_dm_uuid (const char *os_dev)
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{
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struct dm_tree *tree;
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struct dm_tree_node *node;
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const char *node_uuid;
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char *ret;
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if (!grub_util_open_dm (os_dev, &tree, &node))
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return NULL;
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node_uuid = dm_tree_node_get_uuid (node);
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if (! node_uuid)
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{
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grub_dprintf ("hostdisk", "%s has no DM uuid\n", os_dev);
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dm_tree_free (tree);
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return NULL;
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}
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ret = grub_strdup (node_uuid);
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dm_tree_free (tree);
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return ret;
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}
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enum grub_dev_abstraction_types
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grub_util_get_dm_abstraction (const char *os_dev)
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{
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char *uuid;
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uuid = get_dm_uuid (os_dev);
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if (uuid == NULL)
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return GRUB_DEV_ABSTRACTION_NONE;
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if (strncmp (uuid, "LVM-", 4) == 0)
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{
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grub_free (uuid);
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return GRUB_DEV_ABSTRACTION_LVM;
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}
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if (strncmp (uuid, "CRYPT-LUKS1-", 4) == 0)
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{
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grub_free (uuid);
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return GRUB_DEV_ABSTRACTION_LUKS;
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}
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grub_free (uuid);
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return GRUB_DEV_ABSTRACTION_NONE;
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}
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void
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grub_util_pull_devmapper (const char *os_dev)
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{
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struct dm_tree *tree;
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struct dm_tree_node *node;
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struct dm_tree_node *child;
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void *handle = NULL;
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char *lastsubdev = NULL;
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char *uuid;
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uuid = get_dm_uuid (os_dev);
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if (!grub_util_open_dm (os_dev, &tree, &node))
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return;
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while ((child = dm_tree_next_child (&handle, node, 0)))
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{
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const struct dm_info *dm = dm_tree_node_get_info (child);
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char *subdev;
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if (!dm)
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continue;
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subdev = grub_find_device ("/dev", makedev (dm->major, dm->minor));
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if (subdev)
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{
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lastsubdev = subdev;
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grub_util_pull_device (subdev);
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}
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}
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if (uuid && strncmp (uuid, "CRYPT-LUKS1-", sizeof ("CRYPT-LUKS1-") - 1) == 0
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&& lastsubdev)
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{
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char *grdev = grub_util_get_grub_dev (lastsubdev);
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dm_tree_free (tree);
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if (grdev)
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{
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grub_err_t err;
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err = grub_cryptodisk_cheat_mount (grdev, os_dev);
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if (err)
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grub_util_error (_("can't mount encrypted volume `%s': %s"),
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lastsubdev, grub_errmsg);
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}
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grub_free (grdev);
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}
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else
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dm_tree_free (tree);
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}
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char *
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grub_util_devmapper_part_to_disk (struct stat *st,
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int *is_part, const char *path)
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{
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struct dm_tree *tree;
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uint32_t maj, min;
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struct dm_tree_node *node = NULL, *child;
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void *handle;
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const char *node_uuid, *mapper_name = NULL, *child_uuid, *child_name;
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tree = dm_tree_create ();
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if (! tree)
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{
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grub_util_info ("dm_tree_create failed");
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goto devmapper_out;
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}
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maj = major (st->st_rdev);
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min = minor (st->st_rdev);
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if (! dm_tree_add_dev (tree, maj, min))
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{
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grub_util_info ("dm_tree_add_dev failed");
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goto devmapper_out;
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}
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node = dm_tree_find_node (tree, maj, min);
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if (! node)
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{
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grub_util_info ("dm_tree_find_node failed");
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goto devmapper_out;
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}
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reiterate:
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node_uuid = dm_tree_node_get_uuid (node);
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if (! node_uuid)
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{
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grub_util_info ("%s has no DM uuid", path);
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goto devmapper_out;
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}
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if (strncmp (node_uuid, "LVM-", 4) == 0)
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{
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grub_util_info ("%s is an LVM", path);
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goto devmapper_out;
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}
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if (strncmp (node_uuid, "mpath-", 6) == 0)
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{
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/* Multipath partitions have partN-mpath-* UUIDs, and are
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linear mappings so are handled by
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grub_util_get_dm_node_linear_info. Multipath disks are not
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linear mappings and must be handled specially. */
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grub_util_info ("%s is a multipath disk", path);
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goto devmapper_out;
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}
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if (strncmp (node_uuid, "DMRAID-", 7) != 0)
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{
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int major, minor;
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const char *node_name;
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grub_util_info ("%s is not DM-RAID", path);
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if ((node_name = dm_tree_node_get_name (node))
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&& grub_util_get_dm_node_linear_info (node_name,
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&major, &minor, 0))
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{
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*is_part = 1;
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if (tree)
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dm_tree_free (tree);
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char *ret = grub_find_device ("/dev",
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(major << 8) | minor);
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return ret;
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}
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goto devmapper_out;
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}
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handle = NULL;
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/* Counter-intuitively, device-mapper refers to the disk-like
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device containing a DM-RAID partition device as a "child" of
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the partition device. */
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child = dm_tree_next_child (&handle, node, 0);
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if (! child)
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{
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grub_util_info ("%s has no DM children", path);
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goto devmapper_out;
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}
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child_uuid = dm_tree_node_get_uuid (child);
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if (! child_uuid)
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{
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grub_util_info ("%s child has no DM uuid", path);
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goto devmapper_out;
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}
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else if (strncmp (child_uuid, "DMRAID-", 7) != 0)
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{
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grub_util_info ("%s child is not DM-RAID", path);
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goto devmapper_out;
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}
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child_name = dm_tree_node_get_name (child);
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if (! child_name)
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{
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grub_util_info ("%s child has no DM name", path);
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goto devmapper_out;
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}
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mapper_name = child_name;
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*is_part = 1;
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node = child;
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goto reiterate;
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devmapper_out:
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if (! mapper_name && node)
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{
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/* This is a DM-RAID disk, not a partition. */
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mapper_name = dm_tree_node_get_name (node);
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if (! mapper_name)
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grub_util_info ("%s has no DM name", path);
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}
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char *ret;
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if (mapper_name)
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ret = xasprintf ("/dev/mapper/%s", mapper_name);
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else
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ret = NULL;
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if (tree)
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dm_tree_free (tree);
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return ret;
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}
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int
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grub_util_device_is_mapped_stat (struct stat *st)
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{
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#if GRUB_DISK_DEVS_ARE_CHAR
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if (! S_ISCHR (st->st_mode))
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#else
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if (! S_ISBLK (st->st_mode))
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#endif
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return 0;
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if (!grub_device_mapper_supported ())
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return 0;
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return dm_is_dm_major (major (st->st_rdev));
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}
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char *
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grub_util_get_devmapper_grub_dev (const char *os_dev)
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{
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char *uuid, *optr;
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char *grub_dev;
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uuid = get_dm_uuid (os_dev);
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if (!uuid)
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return NULL;
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if (strncmp (uuid, "LVM-", sizeof ("LVM-") - 1) == 0)
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{
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unsigned i;
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int dashes[] = { 0, 6, 10, 14, 18, 22, 26, 32, 38, 42, 46, 50, 54, 58};
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grub_dev = xmalloc (grub_strlen (uuid) + 40);
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optr = grub_stpcpy (grub_dev, "lvmid/");
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for (i = 0; i < ARRAY_SIZE (dashes) - 1; i++)
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{
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memcpy (optr, uuid + sizeof ("LVM-") - 1 + dashes[i],
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dashes[i+1] - dashes[i]);
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optr += dashes[i+1] - dashes[i];
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*optr++ = '-';
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}
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optr = stpcpy (optr, uuid + sizeof ("LVM-") - 1 + dashes[i]);
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*optr = '\0';
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grub_dev[sizeof("lvmid/xxxxxx-xxxx-xxxx-xxxx-xxxx-xxxx-xxxxxx") - 1]
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= '/';
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free (uuid);
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return grub_dev;
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}
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if (strncmp (uuid, "CRYPT-LUKS1-", sizeof ("CRYPT-LUKS1-") - 1) == 0)
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{
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char *dash;
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dash = grub_strchr (uuid + sizeof ("CRYPT-LUKS1-") - 1, '-');
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if (dash)
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*dash = 0;
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grub_dev = grub_xasprintf ("cryptouuid/%s",
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uuid + sizeof ("CRYPT-LUKS1-") - 1);
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grub_free (uuid);
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return grub_dev;
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}
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return NULL;
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}
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char *
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grub_util_get_vg_uuid (const char *os_dev)
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{
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char *uuid, *vgid;
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int dashes[] = { 0, 6, 10, 14, 18, 22, 26, 32};
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unsigned i;
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char *optr;
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uuid = get_dm_uuid (os_dev);
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if (!uuid)
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return NULL;
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vgid = xmalloc (grub_strlen (uuid));
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optr = vgid;
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for (i = 0; i < ARRAY_SIZE (dashes) - 1; i++)
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{
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memcpy (optr, uuid + sizeof ("LVM-") - 1 + dashes[i],
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dashes[i+1] - dashes[i]);
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optr += dashes[i+1] - dashes[i];
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*optr++ = '-';
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}
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optr--;
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*optr = '\0';
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return vgid;
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}
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void
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grub_util_devmapper_cleanup (void)
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{
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dm_lib_release ();
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}
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#else
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void
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grub_util_pull_devmapper (const char *os_dev __attribute__ ((unused)))
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{
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return;
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}
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int
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grub_util_device_is_mapped_stat (struct stat *st __attribute__ ((unused)))
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{
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return 0;
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}
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void
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grub_util_devmapper_cleanup (void)
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{
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}
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enum grub_dev_abstraction_types
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grub_util_get_dm_abstraction (const char *os_dev __attribute__ ((unused)))
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{
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return GRUB_DEV_ABSTRACTION_NONE;
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}
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char *
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grub_util_get_vg_uuid (const char *os_dev __attribute__ ((unused)))
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{
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return NULL;
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}
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char *
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grub_util_devmapper_part_to_disk (struct stat *st __attribute__ ((unused)),
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int *is_part __attribute__ ((unused)),
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const char *os_dev __attribute__ ((unused)))
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{
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return NULL;
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}
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char *
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grub_util_get_devmapper_grub_dev (const char *os_dev __attribute__ ((unused)))
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{
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return NULL;
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}
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#endif
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