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grub/grub-core/osdep/unix/getroot.c

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/*
* GRUB -- GRand Unified Bootloader
* Copyright (C) 1999,2000,2001,2002,2003,2006,2007,2008,2009,2010,2011 Free Software Foundation, Inc.
*
* GRUB 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 3 of the License, or
* (at your option) any later version.
*
* GRUB 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 GRUB. If not, see <http://www.gnu.org/licenses/>.
*/
#include <config-util.h>
#include <config.h>
#include <sys/stat.h>
#include <sys/types.h>
#include <assert.h>
#include <fcntl.h>
#include <unistd.h>
#include <string.h>
#include <dirent.h>
#include <errno.h>
#include <error.h>
#include <stdio.h>
#include <stdlib.h>
#include <stdint.h>
#ifdef HAVE_LIMITS_H
#include <limits.h>
#endif
#include <grub/util/misc.h>
#include <grub/cryptodisk.h>
#include <grub/i18n.h>
#if !defined (__MINGW32__) && !defined (__CYGWIN__) && !defined (__AROS__)
#ifdef __linux__
#include <sys/ioctl.h> /* ioctl */
#include <sys/mount.h>
#ifndef MAJOR
# ifndef MINORBITS
# define MINORBITS 8
# endif /* ! MINORBITS */
# define MAJOR(dev) ((unsigned) ((dev) >> MINORBITS))
#endif /* ! MAJOR */
#ifndef FLOPPY_MAJOR
# define FLOPPY_MAJOR 2
#endif /* ! FLOPPY_MAJOR */
#endif
#include <sys/types.h>
#if defined(HAVE_LIBZFS) && defined(HAVE_LIBNVPAIR)
# include <grub/util/libzfs.h>
# include <grub/util/libnvpair.h>
#endif
#include <grub/mm.h>
#include <grub/misc.h>
#include <grub/emu/misc.h>
#include <grub/emu/hostdisk.h>
#include <grub/emu/getroot.h>
#if defined(__FreeBSD__) || defined(__FreeBSD_kernel__)
# define MAJOR(dev) major(dev)
# define FLOPPY_MAJOR 2
#endif
#if defined (__FreeBSD__) || defined (__FreeBSD_kernel__)
#include <sys/mount.h>
#endif
#if defined(__NetBSD__) || defined(__OpenBSD__)
# include <sys/ioctl.h>
# include <sys/disklabel.h> /* struct disklabel */
# include <sys/disk.h> /* struct dkwedge_info */
#include <sys/param.h>
#include <sys/mount.h>
#endif /* defined(__NetBSD__) || defined(__FreeBSD__) || defined(__FreeBSD_kernel__) */
#if defined(__NetBSD__) || defined(__OpenBSD__)
# define MAJOR(dev) major(dev)
# ifdef HAVE_GETRAWPARTITION
# include <util.h> /* getrawpartition */
# endif /* HAVE_GETRAWPARTITION */
#if defined(__NetBSD__)
# include <sys/fdio.h>
#endif
# ifndef FLOPPY_MAJOR
# define FLOPPY_MAJOR 2
# endif /* ! FLOPPY_MAJOR */
# ifndef RAW_FLOPPY_MAJOR
# define RAW_FLOPPY_MAJOR 9
# endif /* ! RAW_FLOPPY_MAJOR */
#endif /* defined(__NetBSD__) */
#if defined(__FreeBSD__) || defined(__FreeBSD_kernel__)
#define LVM_DEV_MAPPER_STRING "/dev/linux_lvm/"
#else
#define LVM_DEV_MAPPER_STRING "/dev/mapper/"
#endif
#include <sys/types.h>
#include <sys/wait.h>
static void
strip_extra_slashes (char *dir)
{
char *p = dir;
while ((p = strchr (p, '/')) != 0)
{
if (p[1] == '/')
{
memmove (p, p + 1, strlen (p));
continue;
}
else if (p[1] == '\0')
{
if (p > dir)
p[0] = '\0';
break;
}
p++;
}
}
static char *
xgetcwd (void)
{
size_t size = 10;
char *path;
path = xmalloc (size);
while (! getcwd (path, size))
{
size <<= 1;
path = xrealloc (path, size);
}
return path;
}
pid_t
grub_util_exec_pipe (char **argv, int *fd)
{
int mdadm_pipe[2];
pid_t mdadm_pid;
*fd = 0;
if (pipe (mdadm_pipe) < 0)
{
grub_util_warn (_("Unable to create pipe: %s"),
strerror (errno));
return 0;
}
mdadm_pid = fork ();
if (mdadm_pid < 0)
grub_util_error (_("Unable to fork: %s"), strerror (errno));
else if (mdadm_pid == 0)
{
/* Child. */
/* Close fd's. */
grub_util_devmapper_cleanup ();
grub_diskfilter_fini ();
/* Ensure child is not localised. */
setenv ("LC_ALL", "C", 1);
close (mdadm_pipe[0]);
dup2 (mdadm_pipe[1], STDOUT_FILENO);
close (mdadm_pipe[1]);
execvp (argv[0], argv);
exit (127);
}
else
{
close (mdadm_pipe[1]);
*fd = mdadm_pipe[0];
return mdadm_pid;
}
}
#if !defined (__GNU__)
char **
grub_util_find_root_devices_from_poolname (char *poolname)
{
char **devices = 0;
size_t ndevices = 0;
size_t devices_allocated = 0;
#if defined(HAVE_LIBZFS) && defined(HAVE_LIBNVPAIR)
zpool_handle_t *zpool;
libzfs_handle_t *libzfs;
nvlist_t *config, *vdev_tree;
nvlist_t **children;
unsigned int nvlist_count;
unsigned int i;
char *device = 0;
libzfs = grub_get_libzfs_handle ();
if (! libzfs)
return NULL;
zpool = zpool_open (libzfs, poolname);
config = zpool_get_config (zpool, NULL);
if (nvlist_lookup_nvlist (config, "vdev_tree", &vdev_tree) != 0)
error (1, errno, "nvlist_lookup_nvlist (\"vdev_tree\")");
if (nvlist_lookup_nvlist_array (vdev_tree, "children", &children, &nvlist_count) != 0)
error (1, errno, "nvlist_lookup_nvlist_array (\"children\")");
assert (nvlist_count > 0);
while (nvlist_lookup_nvlist_array (children[0], "children",
&children, &nvlist_count) == 0)
assert (nvlist_count > 0);
for (i = 0; i < nvlist_count; i++)
{
if (nvlist_lookup_string (children[i], "path", &device) != 0)
error (1, errno, "nvlist_lookup_string (\"path\")");
struct stat st;
if (stat (device, &st) == 0)
{
#ifdef __sun__
if (grub_memcmp (device, "/dev/dsk/", sizeof ("/dev/dsk/") - 1)
== 0)
device = xasprintf ("/dev/rdsk/%s",
device + sizeof ("/dev/dsk/") - 1);
else if (grub_memcmp (device, "/devices", sizeof ("/devices") - 1)
== 0
&& grub_memcmp (device + strlen (device) - 4,
",raw", 4) != 0)
device = xasprintf ("%s,raw", device);
else
#endif
device = xstrdup (device);
if (ndevices >= devices_allocated)
{
devices_allocated = 2 * (devices_allocated + 8);
devices = xrealloc (devices, sizeof (devices[0])
* devices_allocated);
}
devices[ndevices++] = device;
}
device = NULL;
}
zpool_close (zpool);
#else
FILE *fp;
int ret;
char *line;
size_t len;
int st;
char name[PATH_MAX + 1], state[257], readlen[257], writelen[257];
char cksum[257], notes[257];
unsigned int dummy;
char *argv[4];
pid_t pid;
int fd;
/* execvp has inconvenient types, hence the casts. None of these
strings will actually be modified. */
argv[0] = (char *) "zpool";
argv[1] = (char *) "status";
argv[2] = (char *) poolname;
argv[3] = NULL;
pid = grub_util_exec_pipe (argv, &fd);
if (!pid)
return NULL;
fp = fdopen (fd, "r");
if (!fp)
{
grub_util_warn (_("Unable to open stream from %s: %s"),
"zpool", strerror (errno));
goto out;
}
st = 0;
while (1)
{
line = NULL;
ret = getline (&line, &len, fp);
if (ret == -1)
break;
if (sscanf (line, " %s %256s %256s %256s %256s %256s",
name, state, readlen, writelen, cksum, notes) >= 5)
switch (st)
{
case 0:
if (!strcmp (name, "NAME")
&& !strcmp (state, "STATE")
&& !strcmp (readlen, "READ")
&& !strcmp (writelen, "WRITE")
&& !strcmp (cksum, "CKSUM"))
st++;
break;
case 1:
{
char *ptr = line;
while (1)
{
if (strncmp (ptr, poolname, strlen (poolname)) == 0
&& grub_isspace(ptr[strlen (poolname)]))
st++;
if (!grub_isspace (*ptr))
break;
ptr++;
}
}
break;
case 2:
if (strcmp (name, "mirror") && !sscanf (name, "mirror-%u", &dummy)
&& !sscanf (name, "raidz%u", &dummy)
&& !sscanf (name, "raidz1%u", &dummy)
&& !sscanf (name, "raidz2%u", &dummy)
&& !sscanf (name, "raidz3%u", &dummy)
&& !strcmp (state, "ONLINE"))
{
if (ndevices >= devices_allocated)
{
devices_allocated = 2 * (devices_allocated + 8);
devices = xrealloc (devices, sizeof (devices[0])
* devices_allocated);
}
if (name[0] == '/')
devices[ndevices++] = xstrdup (name);
else
devices[ndevices++] = xasprintf ("/dev/%s", name);
}
break;
}
free (line);
}
out:
close (fd);
waitpid (pid, NULL, 0);
#endif
if (devices)
{
if (ndevices >= devices_allocated)
{
devices_allocated = 2 * (devices_allocated + 8);
devices = xrealloc (devices, sizeof (devices[0])
* devices_allocated);
}
devices[ndevices++] = 0;
}
return devices;
}
static char **
find_root_devices_from_libzfs (const char *dir)
{
char **devices = NULL;
char *poolname;
char *poolfs;
grub_find_zpool_from_dir (dir, &poolname, &poolfs);
if (! poolname)
return NULL;
devices = grub_util_find_root_devices_from_poolname (poolname);
free (poolname);
if (poolfs)
free (poolfs);
return devices;
}
char *
grub_find_device (const char *dir, dev_t dev)
{
DIR *dp;
char *saved_cwd;
struct dirent *ent;
if (! dir)
dir = "/dev";
dp = opendir (dir);
if (! dp)
return 0;
saved_cwd = xgetcwd ();
grub_util_info ("changing current directory to %s", dir);
if (chdir (dir) < 0)
{
free (saved_cwd);
closedir (dp);
return 0;
}
while ((ent = readdir (dp)) != 0)
{
struct stat st;
/* Avoid:
- dotfiles (like "/dev/.tmp.md0") since they could be duplicates.
- dotdirs (like "/dev/.static") since they could contain duplicates. */
if (ent->d_name[0] == '.')
continue;
if (lstat (ent->d_name, &st) < 0)
/* Ignore any error. */
continue;
if (S_ISLNK (st.st_mode)) {
#ifdef __linux__
if (strcmp (dir, "mapper") == 0 || strcmp (dir, "/dev/mapper") == 0) {
/* Follow symbolic links under /dev/mapper/; the canonical name
may be something like /dev/dm-0, but the names under
/dev/mapper/ are more human-readable and so we prefer them if
we can get them. */
if (stat (ent->d_name, &st) < 0)
continue;
} else
#endif /* __linux__ */
/* Don't follow other symbolic links. */
continue;
}
if (S_ISDIR (st.st_mode))
{
/* Find it recursively. */
char *res;
res = grub_find_device (ent->d_name, dev);
if (res)
{
if (chdir (saved_cwd) < 0)
grub_util_error ("%s",
_("cannot restore the original directory"));
free (saved_cwd);
closedir (dp);
return res;
}
}
#if defined(__FreeBSD__) || defined(__FreeBSD_kernel__) || defined(__APPLE__)
if (S_ISCHR (st.st_mode) && st.st_rdev == dev)
#else
if (S_ISBLK (st.st_mode) && st.st_rdev == dev)
#endif
{
#ifdef __linux__
/* Skip device names like /dev/dm-0, which are short-hand aliases
to more descriptive device names, e.g. those under /dev/mapper */
if (ent->d_name[0] == 'd' &&
ent->d_name[1] == 'm' &&
ent->d_name[2] == '-' &&
ent->d_name[3] >= '0' &&
ent->d_name[3] <= '9')
continue;
#endif
/* Found! */
char *res;
char *cwd;
#if defined(__NetBSD__) || defined(__OpenBSD__)
/* Convert this block device to its character (raw) device. */
const char *template = "%s/r%s";
#else
/* Keep the device name as it is. */
const char *template = "%s/%s";
#endif
cwd = xgetcwd ();
res = xmalloc (strlen (cwd) + strlen (ent->d_name) + 3);
sprintf (res, template, cwd, ent->d_name);
strip_extra_slashes (res);
free (cwd);
/* /dev/root is not a real block device keep looking, takes care
of situation where root filesystem is on the same partition as
grub files */
if (strcmp(res, "/dev/root") == 0)
{
free (res);
continue;
}
if (chdir (saved_cwd) < 0)
grub_util_error ("%s", _("cannot restore the original directory"));
free (saved_cwd);
closedir (dp);
return res;
}
}
if (chdir (saved_cwd) < 0)
grub_util_error ("%s", _("cannot restore the original directory"));
free (saved_cwd);
closedir (dp);
return 0;
}
char **
grub_guess_root_devices (const char *dir)
{
char **os_dev = NULL;
struct stat st;
dev_t dev;
#ifdef __linux__
if (!os_dev)
os_dev = grub_find_root_devices_from_mountinfo (dir, NULL);
#endif /* __linux__ */
if (!os_dev)
os_dev = find_root_devices_from_libzfs (dir);
if (os_dev)
{
char **cur;
for (cur = os_dev; *cur; cur++)
{
char *tmp = *cur;
int root, dm;
if (strcmp (*cur, "/dev/root") == 0
|| strncmp (*cur, "/dev/dm-", sizeof ("/dev/dm-") - 1) == 0)
*cur = tmp;
else
{
*cur = canonicalize_file_name (tmp);
if (*cur == NULL)
grub_util_error (_("failed to get canonical path of `%s'"), tmp);
free (tmp);
}
root = (strcmp (*cur, "/dev/root") == 0);
dm = (strncmp (*cur, "/dev/dm-", sizeof ("/dev/dm-") - 1) == 0);
if (!dm && !root)
continue;
if (stat (*cur, &st) < 0)
break;
free (*cur);
dev = st.st_rdev;
*cur = grub_find_device (dm ? "/dev/mapper" : "/dev", dev);
}
if (!*cur)
return os_dev;
for (cur = os_dev; *cur; cur++)
free (*cur);
free (os_dev);
os_dev = 0;
}
if (stat (dir, &st) < 0)
grub_util_error (_("cannot stat `%s': %s"), dir, strerror (errno));
dev = st.st_dev;
os_dev = xmalloc (2 * sizeof (os_dev[0]));
/* This might be truly slow, but is there any better way? */
os_dev[0] = grub_find_device ("/dev", dev);
if (!os_dev[0])
{
free (os_dev);
return 0;
}
os_dev[1] = 0;
return os_dev;
}
#endif
void
grub_util_pull_lvm_by_command (const char *os_dev)
{
char *argv[8];
int fd;
pid_t pid;
FILE *mdadm;
char *buf = NULL;
size_t len = 0;
char *vgname = NULL;
const char *iptr;
char *optr;
char *vgid = NULL;
grub_size_t vgidlen = 0;
vgid = grub_util_get_vg_uuid (os_dev);
if (vgid)
vgidlen = grub_strlen (vgid);
if (!vgid)
{
if (strncmp (os_dev, LVM_DEV_MAPPER_STRING,
sizeof (LVM_DEV_MAPPER_STRING) - 1)
!= 0)
return;
vgname = xmalloc (strlen (os_dev + sizeof (LVM_DEV_MAPPER_STRING) - 1) + 1);
for (iptr = os_dev + sizeof (LVM_DEV_MAPPER_STRING) - 1, optr = vgname; *iptr; )
if (*iptr != '-')
*optr++ = *iptr++;
else if (iptr[0] == '-' && iptr[1] == '-')
{
iptr += 2;
*optr++ = '-';
}
else
break;
*optr = '\0';
}
/* execvp has inconvenient types, hence the casts. None of these
strings will actually be modified. */
/* by default PV name is left aligned in 10 character field, meaning that
we do not know where name ends. Using dummy --separator disables
alignment. We have a single field, so separator itself is not output */
argv[0] = (char *) "vgs";
argv[1] = (char *) "--options";
if (vgid)
argv[2] = (char *) "vg_uuid,pv_name";
else
argv[2] = (char *) "pv_name";
argv[3] = (char *) "--noheadings";
argv[4] = (char *) "--separator";
argv[5] = (char *) ":";
argv[6] = vgname;
argv[7] = NULL;
pid = grub_util_exec_pipe (argv, &fd);
free (vgname);
if (!pid)
return;
/* Parent. Read mdadm's output. */
mdadm = fdopen (fd, "r");
if (! mdadm)
{
grub_util_warn (_("Unable to open stream from %s: %s"),
"vgs", strerror (errno));
goto out;
}
while (getline (&buf, &len, mdadm) > 0)
{
char *ptr;
/* LVM adds two spaces as standard prefix */
for (ptr = buf; ptr < buf + 2 && *ptr == ' '; ptr++);
if (vgid && (grub_strncmp (vgid, ptr, vgidlen) != 0
|| ptr[vgidlen] != ':'))
continue;
if (vgid)
ptr += vgidlen + 1;
if (*ptr == '\0')
continue;
*(ptr + strlen (ptr) - 1) = '\0';
grub_util_pull_device (ptr);
}
out:
close (fd);
waitpid (pid, NULL, 0);
free (buf);
}
/* ZFS has similar problems to those of btrfs (see above). */
void
grub_find_zpool_from_dir (const char *dir, char **poolname, char **poolfs)
{
char *slash;
*poolname = *poolfs = NULL;
#if defined(HAVE_STRUCT_STATFS_F_FSTYPENAME) && defined(HAVE_STRUCT_STATFS_F_MNTFROMNAME)
/* FreeBSD and GNU/kFreeBSD. */
{
struct statfs mnt;
if (statfs (dir, &mnt) != 0)
return;
if (strcmp (mnt.f_fstypename, "zfs") != 0)
return;
*poolname = xstrdup (mnt.f_mntfromname);
}
#elif defined(HAVE_GETEXTMNTENT)
/* Solaris. */
{
struct stat st;
struct extmnttab mnt;
if (stat (dir, &st) != 0)
return;
FILE *mnttab = grub_util_fopen ("/etc/mnttab", "r");
if (! mnttab)
return;
while (getextmntent (mnttab, &mnt, sizeof (mnt)) == 0)
{
if (makedev (mnt.mnt_major, mnt.mnt_minor) == st.st_dev
&& !strcmp (mnt.mnt_fstype, "zfs"))
{
*poolname = xstrdup (mnt.mnt_special);
break;
}
}
fclose (mnttab);
}
#endif
if (! *poolname)
return;
slash = strchr (*poolname, '/');
if (slash)
{
*slash = '\0';
*poolfs = xstrdup (slash + 1);
}
else
*poolfs = xstrdup ("");
}
/* This function never prints trailing slashes (so that its output
can be appended a slash unconditionally). */
char *
grub_make_system_path_relative_to_its_root (const char *path)
{
struct stat st;
char *p, *buf, *buf2, *buf3, *ret;
uintptr_t offset = 0;
dev_t num;
size_t len;
char *poolfs = NULL;
/* canonicalize. */
p = canonicalize_file_name (path);
if (p == NULL)
grub_util_error (_("failed to get canonical path of `%s'"), path);
/* For ZFS sub-pool filesystems, could be extended to others (btrfs?). */
{
char *dummy;
grub_find_zpool_from_dir (p, &dummy, &poolfs);
}
len = strlen (p) + 1;
buf = xstrdup (p);
free (p);
if (stat (buf, &st) < 0)
grub_util_error (_("cannot stat `%s': %s"), buf, strerror (errno));
buf2 = xstrdup (buf);
num = st.st_dev;
/* This loop sets offset to the number of chars of the root
directory we're inspecting. */
while (1)
{
p = strrchr (buf, '/');
if (p == NULL)
/* This should never happen. */
grub_util_error ("%s",
/* TRANSLATORS: canonical pathname is the
complete one e.g. /etc/fstab. It has
to contain `/' normally, if it doesn't
we're in trouble and throw this error. */
_("no `/' in canonical filename"));
if (p != buf)
*p = 0;
else
*++p = 0;
if (stat (buf, &st) < 0)
grub_util_error (_("cannot stat `%s': %s"), buf, strerror (errno));
/* buf is another filesystem; we found it. */
if (st.st_dev != num)
{
/* offset == 0 means path given is the mount point.
This works around special-casing of "/" in Un*x. This function never
prints trailing slashes (so that its output can be appended a slash
unconditionally). Each slash in is considered a preceding slash, and
therefore the root directory is an empty string. */
if (offset == 0)
{
free (buf);
#ifdef __linux__
{
char *bind;
grub_free (grub_find_root_devices_from_mountinfo (buf2, &bind));
if (bind && bind[0] && bind[1])
{
buf3 = bind;
goto parsedir;
}
grub_free (bind);
}
#endif
free (buf2);
if (poolfs)
return xasprintf ("/%s/@", poolfs);
return xstrdup ("");
}
else
break;
}
offset = p - buf;
/* offset == 1 means root directory. */
if (offset == 1)
{
/* Include leading slash. */
offset = 0;
break;
}
}
free (buf);
buf3 = xstrdup (buf2 + offset);
buf2[offset] = 0;
#ifdef __linux__
{
char *bind;
grub_free (grub_find_root_devices_from_mountinfo (buf2, &bind));
if (bind && bind[0] && bind[1])
{
char *temp = buf3;
buf3 = grub_xasprintf ("%s%s%s", bind, buf3[0] == '/' ?"":"/", buf3);
grub_free (temp);
}
grub_free (bind);
}
#endif
free (buf2);
#ifdef __linux__
parsedir:
#endif
/* Remove trailing slashes, return empty string if root directory. */
len = strlen (buf3);
while (len > 0 && buf3[len - 1] == '/')
{
buf3[len - 1] = '\0';
len--;
}
if (poolfs)
{
ret = xasprintf ("/%s/@%s", poolfs, buf3);
free (buf3);
}
else
ret = buf3;
return ret;
}
int
grub_util_biosdisk_is_floppy (grub_disk_t disk)
{
struct stat st;
int fd;
const char *dname;
dname = grub_util_biosdisk_get_osdev (disk);
if (!dname)
return 0;
fd = open (dname, O_RDONLY);
/* Shouldn't happen. */
if (fd == -1)
return 0;
/* Shouldn't happen either. */
if (fstat (fd, &st) < 0)
{
close (fd);
return 0;
}
close (fd);
#if defined(__NetBSD__)
if (major(st.st_rdev) == RAW_FLOPPY_MAJOR)
return 1;
#endif
#if defined(FLOPPY_MAJOR)
if (major(st.st_rdev) == FLOPPY_MAJOR)
#else
/* Some kernels (e.g. kFreeBSD) don't have a static major number
for floppies, but they still use a "fd[0-9]" pathname. */
if (dname[5] == 'f'
&& dname[6] == 'd'
&& dname[7] >= '0'
&& dname[7] <= '9')
#endif
return 1;
return 0;
}
const char *
grub_util_check_block_device (const char *blk_dev)
{
struct stat st;
if (stat (blk_dev, &st) < 0)
grub_util_error (_("cannot stat `%s': %s"), blk_dev,
strerror (errno));
if (S_ISBLK (st.st_mode))
return (blk_dev);
else
return 0;
}
const char *
grub_util_check_char_device (const char *blk_dev)
{
struct stat st;
if (stat (blk_dev, &st) < 0)
grub_util_error (_("cannot stat `%s': %s"), blk_dev, strerror (errno));
if (S_ISCHR (st.st_mode))
return (blk_dev);
else
return 0;
}
#else
void
grub_util_pull_lvm_by_command (const char *os_dev __attribute__ ((unused)))
{
}
#endif
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