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#include <stdio.h>
#include <stdlib.h>
#include <errno.h>
#include <unistd.h>
#include <stdarg.h>
#include <string.h>
#include <sys/types.h>
#include <sys/stat.h>
#include <libmount.h>
#include <blkid.h>
#include <sys/utsname.h>
#include "nls.h"
#include "c.h"
#include "strutils.h"
#include "xalloc.h"
#include "pathnames.h"
#include "match.h"
#include "findmnt.h"
struct verify_context {
struct libmnt_fs *fs;
struct libmnt_table *tb;
char **fs_ary;
size_t fs_num;
size_t fs_alloc;
int nwarnings;
int nerrors;
unsigned int target_printed : 1,
no_fsck : 1;
};
static void __attribute__ ((__format__ (__printf__, 3, 0)))
verify_mesg(struct verify_context *vfy, char type, const char *fmt, va_list ap)
{
if (!vfy->target_printed && vfy->fs) {
fprintf(stdout, "%s\n", mnt_fs_get_target(vfy->fs));
vfy->target_printed = 1;
}
fprintf(stdout, " [%c] ", type);
vfprintf(stdout, fmt, ap);
fputc('\n', stdout);
}
static int __attribute__ ((__format__ (__printf__, 2, 3)))
verify_warn(struct verify_context *vfy, const char *fmt, ...)
{
va_list ap;
vfy->nwarnings++;
va_start(ap, fmt);
verify_mesg(vfy, 'W', fmt, ap);
va_end(ap);
return 0;
}
static int __attribute__ ((__format__ (__printf__, 2, 3)))
verify_err(struct verify_context *vfy, const char *fmt, ...)
{
va_list ap;
vfy->nerrors++;
va_start(ap, fmt);
verify_mesg(vfy, 'E', fmt, ap);
va_end(ap);
return 0;
}
static int __attribute__ ((__format__ (__printf__, 2, 3)))
verify_ok(struct verify_context *vfy __attribute__((unused)),
const char *fmt, ...)
{
va_list ap;
if (!(flags & FL_VERBOSE))
return 0;
va_start(ap, fmt);
verify_mesg(vfy, ' ', fmt, ap);
va_end(ap);
return 0;
}
static int verify_order(struct verify_context *vfy)
{
struct libmnt_iter *itr = NULL;
struct libmnt_fs *next;
const char *tgt;
tgt = mnt_fs_get_target(vfy->fs);
if (tgt && !(flags & FL_NOCACHE))
tgt = mnt_resolve_target(tgt, cache);
else if (!tgt)
return 0;
itr = mnt_new_iter(MNT_ITER_FORWARD);
if (!itr) {
warn(_("failed to initialize libmount iterator"));
goto done;
}
/* set iterator position to 'fs' */
mnt_table_set_iter(vfy->tb, itr, vfy->fs);
if (mnt_table_next_fs(vfy->tb, itr, &next) != 0)
goto done;
/* scan all next filesystems */
while (mnt_table_next_fs(vfy->tb, itr, &next) == 0) {
const char *n_tgt;
size_t len;
n_tgt = mnt_fs_get_target(next);
if (n_tgt && !(flags & FL_NOCACHE))
n_tgt = mnt_resolve_target(n_tgt, cache);
else if (!n_tgt)
continue;
len = strlen(n_tgt);
if (strncmp(n_tgt, tgt, len) == 0) {
if (*(tgt + len) == '\0')
verify_warn(vfy, _("target specified more than once"));
else if (*(tgt + len) == '/')
verify_err(vfy, _("wrong order: %s specified before %s"), tgt, n_tgt);
}
}
done:
mnt_free_iter(itr);
return 0;
}
static int verify_target(struct verify_context *vfy)
{
const char *tgt = mnt_fs_get_target(vfy->fs);
struct stat sb;
if (!tgt)
return verify_err(vfy, _("undefined target (fs_file)"));
if (!(flags & FL_NOCACHE)) {
const char *cn = mnt_resolve_target(tgt, cache);
if (!cn)
return -ENOMEM;
if (strcmp(cn, tgt) != 0)
verify_warn(vfy, _("non-canonical target path (real: %s)"), cn);
tgt = cn;
}
if (stat(tgt, &sb) != 0) {
if (mnt_fs_get_option(vfy->fs, "noauto", NULL, NULL) == 1)
verify_err(vfy, _("unreachable on boot required target: %m"));
else
verify_warn(vfy, _("unreachable target: %m"));
} else if (!S_ISDIR(sb.st_mode)
&& mnt_fs_get_option(vfy->fs, "bind", NULL, NULL) == 1) {
verify_err(vfy, _("target is not a directory"));
} else
verify_ok(vfy, _("target exists"));
return 0;
}
static char *verify_tag(struct verify_context *vfy, const char *name,
const char *value)
{
char *src = NULL;
if (!(flags & FL_NOCACHE))
src = mnt_resolve_tag(name, value, cache);
if (!src) {
if (mnt_fs_get_option(vfy->fs, "noauto", NULL, NULL) == 1)
verify_err(vfy, _("unreachable on boot required source: %s=%s"), name, value);
else
verify_warn(vfy, _("unreachable: %s=%s"), name, value);
} else
verify_ok(vfy, _("%s=%s translated to %s"), name, value, src);
return src;
}
/* Note that mount source is very FS specific and we should not
* interpret unreachable source as error. The exception is only
* NAME=value, this has to be convertible to device name.
*/
static int verify_source(struct verify_context *vfy)
{
const char *src = mnt_fs_get_srcpath(vfy->fs);
char *t = NULL, *v = NULL;
struct stat sb;
int isbind, rc = 0;
/* source is NAME=value tag */
if (!src) {
const char *tag = NULL, *val = NULL;
if (mnt_fs_get_tag(vfy->fs, &tag, &val) != 0)
return verify_err(vfy, _("undefined source (fs_spec)"));
src = verify_tag(vfy, tag, val);
if (!src)
goto done;
/* blkid is able to parse it, but libmount does not see it as a tag --
* it means unsupported tag */
} else if (blkid_parse_tag_string(src, &t, &v) == 0 && stat(src, &sb) != 0) {
rc = verify_err(vfy, _("unsupported source tag: %s"), src);
goto done;
}
isbind = mnt_fs_get_option(vfy->fs, "bind", NULL, NULL) == 0;
/* source is path */
if (mnt_fs_is_pseudofs(vfy->fs) || mnt_fs_is_netfs(vfy->fs))
verify_ok(vfy, _("do not check %s source (pseudo/net)"), src);
else if (stat(src, &sb) != 0)
verify_warn(vfy, _("unreachable source: %s: %m"), src);
else if ((S_ISDIR(sb.st_mode) || S_ISREG(sb.st_mode)) && !isbind)
verify_warn(vfy, _("non-bind mount source %s is a directory or regular file"), src);
else if (!S_ISBLK(sb.st_mode) && !isbind)
verify_warn(vfy, _("source %s is not a block device"), src);
else
verify_ok(vfy, _("source %s exists"), src);
done:
free(t);
free(v);
return rc;
}
static int verify_options(struct verify_context *vfy)
{
const char *opts;
opts = mnt_fs_get_vfs_options(vfy->fs);
if (opts)
verify_ok(vfy, _("VFS options: %s"), opts);
opts = mnt_fs_get_fs_options(vfy->fs);
if (opts)
verify_ok(vfy, _("FS options: %s"), opts);
opts = mnt_fs_get_user_options(vfy->fs);
if (opts)
verify_ok(vfy, _("userspace options: %s"), opts);
return 0;
}
static int verify_swaparea(struct verify_context *vfy)
{
char *arg;
size_t argsz = 0;
if (mnt_fs_get_option(vfy->fs, "discard", &arg, &argsz) == 0
&& arg
&& strncmp(arg, "once", argsz) != 0
&& strncmp(arg, "pages", argsz) != 0)
verify_err(vfy, _("unsupported swaparea discard policy: %s"), arg);
if (mnt_fs_get_option(vfy->fs, "pri", &arg, &argsz) == 0 && arg) {
char *p = arg;
if (*p == '-')
p++;
for (; p < arg + argsz; p++) {
if (!isdigit((unsigned char) *p)) {
verify_err(vfy, _("failed to parse swaparea priority option"));
break;
}
}
}
return 0;
}
static int is_supported_filesystem(struct verify_context *vfy, const char *name)
{
size_t n;
if (!vfy->fs_num)
return 0;
for (n = 0; n < vfy->fs_num; n++ ) {
if (match_fstype(vfy->fs_ary[n], name))
return 1;
}
return 0;
}
static int add_filesystem(struct verify_context *vfy, const char *name)
{
#define MYCHUNK 16
if (is_supported_filesystem(vfy, name))
return 0;
if (vfy->fs_alloc == 0 || vfy->fs_num + 1 <= vfy->fs_alloc) {
vfy->fs_alloc = ((vfy->fs_alloc + 1 + MYCHUNK) / MYCHUNK) * MYCHUNK;
vfy->fs_ary = xrealloc(vfy->fs_ary, vfy->fs_alloc * sizeof(char *));
}
vfy->fs_ary[vfy->fs_num] = xstrdup(name);
vfy->fs_num++;
return 0;
}
static int read_proc_filesystems(struct verify_context *vfy)
{
int rc = 0;
FILE *f;
char buf[80], *cp, *t;
f = fopen("/proc/filesystems", "r");
if (!f)
return -errno;
while (!feof(f)) {
if (!fgets(buf, sizeof(buf), f))
break;
cp = buf;
if (!isspace(*cp)) {
while (*cp && !isspace(*cp))
cp++;
}
while (*cp && isspace(*cp))
cp++;
if ((t = strchr(cp, '\n')) != NULL)
*t = 0;
if ((t = strchr(cp, '\t')) != NULL)
*t = 0;
if ((t = strchr(cp, ' ')) != NULL)
*t = 0;
rc = add_filesystem(vfy, cp);
if (rc)
break;
}
fclose(f);
return rc;
}
static void free_proc_filesystems(struct verify_context *vfy)
{
size_t n;
if (!vfy->fs_ary)
return;
for (n = 0; n < vfy->fs_num; n++ )
free(vfy->fs_ary[n]);
free(vfy->fs_ary);
}
static int read_kernel_filesystems(struct verify_context *vfy)
{
int rc = 0;
#ifdef __linux__
struct utsname uts;
FILE *f;
char buf[1024];
if (uname(&uts))
return 0;
snprintf(buf, sizeof(buf), "/lib/modules/%s/modules.dep", uts.release);
f = fopen(buf, "r");
if (!f)
return 0;
while (!feof(f)) {
char *p, *name;
if (!fgets(buf, sizeof(buf), f))
break;
if (strncmp("kernel/fs/", buf, 10) != 0 ||
strncmp("kernel/fs/nls/", buf, 14) == 0)
continue;
p = strchr(buf, ':');
if (!p)
continue;
*p = '\0';
name = strrchr(buf, '/');
if (!name)
continue;
name++;
p = strstr(name, ".ko");
if (!p)
continue;
*p = '\0';
rc = add_filesystem(vfy, name);
if (rc)
break;
}
fclose(f);
#endif /* __linux__ */
return rc;
}
static int verify_fstype(struct verify_context *vfy)
{
char *src = mnt_resolve_spec(mnt_fs_get_source(vfy->fs), cache);
char *realtype = NULL;
const char *type;
int ambi = 0, isauto = 0, isswap = 0;
if (!src)
return 0;
if (mnt_fs_is_pseudofs(vfy->fs) || mnt_fs_is_netfs(vfy->fs)) {
verify_ok(vfy, _("do not check %s FS type (pseudo/net)"), src);
goto done;
}
type = mnt_fs_get_fstype(vfy->fs);
if (type) {
int none = strcmp(type, "none") == 0;
if (none
&& mnt_fs_get_option(vfy->fs, "bind", NULL, NULL) == 1
&& mnt_fs_get_option(vfy->fs, "move", NULL, NULL) == 1) {
verify_warn(vfy, _("\"none\" FS type is recommended for bind or move oprations only"));
goto done;
}
if (strcmp(type, "auto") == 0)
isauto = 1;
else if (strcmp(type, "swap") == 0)
isswap = 1;
else if (strcmp(type, "xfs") == 0 || strcmp(type, "btrfs") == 0)
vfy->no_fsck = 1;
if (!isswap && !isauto && !none && !is_supported_filesystem(vfy, type))
verify_warn(vfy, _("%s seems unsupported by the current kernel"), type);
}
errno = 0;
realtype = mnt_get_fstype(src, &ambi, cache);
if (!realtype) {
const char *reson = errno ? strerror(errno) : _("reason unknown");
if (isauto)
verify_err(vfy, _("cannot detect on-disk filesystem type (%s)"), reson);
else
verify_warn(vfy, _("cannot detect on-disk filesystem type (%s)"), reson);
goto done;
}
if (realtype) {
isswap = strcmp(realtype, "swap") == 0;
vfy->no_fsck = strcmp(realtype, "xfs") == 0
|| strcmp(realtype, "btrfs") == 0;
if (type && !isauto && strcmp(type, realtype) != 0) {
verify_err(vfy, _("%s does not match with on-disk %s"), type, realtype);
goto done;
}
if (!isswap && !is_supported_filesystem(vfy, realtype)) {
verify_err(vfy, _("on-disk %s seems unsupported by the current kernel"), realtype);
goto done;
}
verify_ok(vfy, _("FS type is %s"), realtype);
}
done:
if (!cache) {
free(src);
free(realtype);
}
return 0;
}
static int verify_passno(struct verify_context *vfy)
{
int passno = mnt_fs_get_passno(vfy->fs);
const char *tgt = mnt_fs_get_target(vfy->fs);
if (tgt && strcmp("/", tgt) == 0 && passno != 1 && !vfy->no_fsck)
return verify_warn(vfy, _("recommended root FS passno is 1 (current is %d)"), passno);
return 0;
}
static int verify_filesystem(struct verify_context *vfy)
{
int rc = 0;
if (mnt_fs_is_swaparea(vfy->fs))
rc = verify_swaparea(vfy);
else {
rc = verify_target(vfy);
if (!rc)
rc = verify_options(vfy);
}
if (!rc)
rc = verify_source(vfy);
if (!rc)
rc = verify_fstype(vfy);
if (!rc)
rc = verify_passno(vfy); /* depends on verify_fstype() */
return rc;
}
int verify_table(struct libmnt_table *tb)
{
struct verify_context vfy = { .nerrors = 0 };
struct libmnt_iter *itr;
int rc = 0; /* overall return code (alloc errors, etc.) */
int check_order = is_listall_mode();
static int has_read_fs = 0;
itr = mnt_new_iter(MNT_ITER_FORWARD);
if (!itr) {
warn(_("failed to initialize libmount iterator"));
goto done;
}
vfy.tb = tb;
if (has_read_fs == 0) {
read_proc_filesystems(&vfy);
read_kernel_filesystems(&vfy);
has_read_fs = 1;
}
while (rc == 0 && (vfy.fs = get_next_fs(tb, itr))) {
vfy.target_printed = 0;
vfy.no_fsck = 0;
if (check_order)
rc = verify_order(&vfy);
if (!rc)
rc = verify_filesystem(&vfy);
if (flags & FL_FIRSTONLY)
break;
flags |= FL_NOSWAPMATCH;
}
#ifdef USE_SYSTEMD
{
struct stat a, b;
if (stat(_PATH_SD_UNITSLOAD, &a) == 0 &&
stat(_PATH_MNTTAB, &b) == 0 &&
cmp_stat_mtime(&a, &b, <))
verify_warn(&vfy, _(
"your fstab has been modified, but systemd still uses the old version;\n"
" use 'systemctl daemon-reload' to reload"));
}
#endif
done:
mnt_free_iter(itr);
/* summary */
if (vfy.nerrors || parse_nerrors || vfy.nwarnings) {
fputc('\n', stderr);
fprintf(stderr, P_("%d parse error", "%d parse errors", parse_nerrors), parse_nerrors);
fprintf(stderr, P_(", %d error", ", %d errors", vfy.nerrors), vfy.nerrors);
fprintf(stderr, P_(", %d warning", ", %d warnings", vfy.nwarnings), vfy.nwarnings);
fputc('\n', stderr);
} else
fprintf(stdout, _("Success, no errors or warnings detected\n"));
free_proc_filesystems(&vfy);
return rc != 0 ? rc : vfy.nerrors + parse_nerrors;
}