367 lines
11 KiB
C
367 lines
11 KiB
C
/* SPDX-License-Identifier: LGPL-2.1-or-later */
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#include <errno.h>
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#include <stdio.h>
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#include <stdlib.h>
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#include "alloc-util.h"
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#include "device-nodes.h"
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#include "fstab-util.h"
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#include "initrd-util.h"
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#include "macro.h"
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#include "mount-util.h"
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#include "nulstr-util.h"
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#include "parse-util.h"
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#include "path-util.h"
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#include "proc-cmdline.h"
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#include "string-util.h"
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#include "strv.h"
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bool fstab_enabled_full(int enabled) {
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static int cached = -1;
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bool val = true; /* If nothing specified or the check fails, then defaults to true. */
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int r;
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/* If 'enabled' is non-negative, then update the cache with it. */
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if (enabled >= 0)
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cached = enabled;
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if (cached >= 0)
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return cached;
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r = proc_cmdline_get_bool("fstab", PROC_CMDLINE_STRIP_RD_PREFIX|PROC_CMDLINE_TRUE_WHEN_MISSING, &val);
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if (r < 0)
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log_debug_errno(r, "Failed to parse fstab= kernel command line option, ignoring: %m");
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return (cached = val);
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}
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int fstab_has_fstype(const char *fstype) {
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_cleanup_endmntent_ FILE *f = NULL;
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struct mntent *m;
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assert(fstype);
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if (!fstab_enabled())
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return false;
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f = setmntent(fstab_path(), "re");
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if (!f)
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return errno == ENOENT ? false : -errno;
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for (;;) {
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errno = 0;
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m = getmntent(f);
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if (!m)
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return errno != 0 ? -errno : false;
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if (streq(m->mnt_type, fstype))
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return true;
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}
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return false;
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}
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bool fstab_is_extrinsic(const char *mount, const char *opts) {
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/* Don't bother with the OS data itself */
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if (PATH_IN_SET(mount,
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"/",
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"/usr",
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"/etc"))
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return true;
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if (PATH_STARTSWITH_SET(mount,
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"/run/initramfs", /* This should stay around from before we boot until after we shutdown */
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"/run/nextroot", /* Similar (though might be updated from the host) */
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"/proc", /* All of this is API VFS */
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"/sys", /* … dito … */
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"/dev")) /* … dito … */
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return true;
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/* If this is an initrd mount, and we are not in the initrd, then leave
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* this around forever, too. */
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if (fstab_test_option(opts, "x-initrd.mount\0") && !in_initrd())
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return true;
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return false;
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}
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static int fstab_is_same_node(const char *what_fstab, const char *path) {
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_cleanup_free_ char *node = NULL;
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assert(what_fstab);
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assert(path);
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node = fstab_node_to_udev_node(what_fstab);
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if (!node)
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return -ENOMEM;
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if (path_equal(node, path))
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return true;
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if (is_device_path(path) && is_device_path(node))
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return devnode_same(node, path);
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return false;
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}
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int fstab_is_mount_point_full(const char *where, const char *path) {
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_cleanup_endmntent_ FILE *f = NULL;
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int r;
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assert(where || path);
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if (!fstab_enabled())
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return false;
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f = setmntent(fstab_path(), "re");
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if (!f)
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return errno == ENOENT ? false : -errno;
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for (;;) {
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struct mntent *me;
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errno = 0;
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me = getmntent(f);
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if (!me)
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return errno != 0 ? -errno : false;
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if (where && !path_equal(where, me->mnt_dir))
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continue;
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if (!path)
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return true;
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r = fstab_is_same_node(me->mnt_fsname, path);
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if (r > 0 || (r < 0 && !ERRNO_IS_DEVICE_ABSENT(r)))
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return r;
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}
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return false;
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}
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int fstab_filter_options(
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const char *opts,
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const char *names,
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const char **ret_namefound,
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char **ret_value,
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char ***ret_values,
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char **ret_filtered) {
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const char *namefound = NULL, *x;
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_cleanup_strv_free_ char **stor = NULL, **values = NULL;
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_cleanup_free_ char *value = NULL, **filtered = NULL;
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int r;
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assert(names && *names);
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assert(!(ret_value && ret_values));
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if (!opts)
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goto answer;
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/* Finds any options matching 'names', and returns:
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* - the last matching option name in ret_namefound,
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* - the last matching value in ret_value,
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* - any matching values in ret_values,
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* - the rest of the option string in ret_filtered.
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*
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* If !ret_value and !ret_values and !ret_filtered, this function is not allowed to fail.
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*
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* Returns negative on error, true if any matching options were found, false otherwise. */
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if (ret_filtered || ret_value || ret_values) {
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/* For backwards compatibility, we need to pass-through escape characters.
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* The only ones we "consume" are the ones used as "\," or "\\". */
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r = strv_split_full(&stor, opts, ",", EXTRACT_UNESCAPE_SEPARATORS | EXTRACT_UNESCAPE_RELAX);
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if (r < 0)
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return r;
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filtered = memdup(stor, sizeof(char*) * (strv_length(stor) + 1));
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if (!filtered)
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return -ENOMEM;
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char **t = filtered;
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for (char **s = t; *s; s++) {
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NULSTR_FOREACH(name, names) {
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x = startswith(*s, name);
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if (!x)
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continue;
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/* Match name, but when ret_values, only when followed by assignment. */
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if (*x == '=' || (!ret_values && *x == '\0')) {
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/* Keep the last occurrence found */
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namefound = name;
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goto found;
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}
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}
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*t = *s;
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t++;
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continue;
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found:
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if (ret_value || ret_values) {
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assert(IN_SET(*x, '=', '\0'));
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if (ret_value) {
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r = free_and_strdup(&value, *x == '=' ? x + 1 : NULL);
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if (r < 0)
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return r;
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} else if (*x) {
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r = strv_extend(&values, x + 1);
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if (r < 0)
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return r;
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}
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}
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}
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*t = NULL;
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} else
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for (const char *word = opts;;) {
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const char *end = word;
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/* Look for a *non-escaped* comma separator. Only commas and backslashes can be
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* escaped, so "\," and "\\" are the only valid escape sequences, and we can do a
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* very simple test here. */
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for (;;) {
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end += strcspn(end, ",\\");
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if (IN_SET(*end, ',', '\0'))
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break;
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assert(*end == '\\');
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end ++; /* Skip the backslash */
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if (*end != '\0')
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end ++; /* Skip the escaped char, but watch out for a trailing comma */
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}
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NULSTR_FOREACH(name, names) {
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if (end < word + strlen(name))
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continue;
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if (!strneq(word, name, strlen(name)))
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continue;
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/* We know that the string is NUL terminated, so *x is valid */
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x = word + strlen(name);
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if (IN_SET(*x, '\0', '=', ',')) {
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namefound = name;
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break;
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}
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}
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if (*end)
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word = end + 1;
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else
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break;
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}
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answer:
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if (ret_namefound)
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*ret_namefound = namefound;
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if (ret_filtered) {
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char *f;
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f = strv_join_full(filtered, ",", NULL, true);
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if (!f)
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return -ENOMEM;
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*ret_filtered = f;
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}
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if (ret_value)
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*ret_value = TAKE_PTR(value);
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if (ret_values)
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*ret_values = TAKE_PTR(values);
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return !!namefound;
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}
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int fstab_find_pri(const char *options, int *ret) {
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_cleanup_free_ char *opt = NULL;
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int r, pri;
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assert(ret);
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r = fstab_filter_options(options, "pri\0", NULL, &opt, NULL, NULL);
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if (r < 0)
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return r;
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if (r == 0 || !opt)
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return 0;
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r = safe_atoi(opt, &pri);
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if (r < 0)
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return r;
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*ret = pri;
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return 1;
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}
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static char *unquote(const char *s, const char* quotes) {
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size_t l;
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assert(s);
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/* This is rather stupid, simply removes the heading and
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* trailing quotes if there is one. Doesn't care about
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* escaping or anything.
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*
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* DON'T USE THIS FOR NEW CODE ANYMORE! */
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l = strlen(s);
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if (l < 2)
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return strdup(s);
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if (strchr(quotes, s[0]) && s[l-1] == s[0])
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return strndup(s+1, l-2);
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return strdup(s);
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}
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static char *tag_to_udev_node(const char *tagvalue, const char *by) {
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_cleanup_free_ char *t = NULL, *u = NULL;
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size_t enc_len;
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u = unquote(tagvalue, QUOTES);
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if (!u)
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return NULL;
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enc_len = strlen(u) * 4 + 1;
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t = new(char, enc_len);
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if (!t)
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return NULL;
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if (encode_devnode_name(u, t, enc_len) < 0)
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return NULL;
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return strjoin("/dev/disk/by-", by, "/", t);
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}
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char *fstab_node_to_udev_node(const char *p) {
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const char *q;
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assert(p);
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q = startswith(p, "LABEL=");
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if (q)
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return tag_to_udev_node(q, "label");
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q = startswith(p, "UUID=");
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if (q)
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return tag_to_udev_node(q, "uuid");
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q = startswith(p, "PARTUUID=");
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if (q)
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return tag_to_udev_node(q, "partuuid");
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q = startswith(p, "PARTLABEL=");
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if (q)
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return tag_to_udev_node(q, "partlabel");
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return strdup(p);
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}
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bool fstab_is_bind(const char *options, const char *fstype) {
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if (fstab_test_option(options, "bind\0" "rbind\0"))
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return true;
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if (fstype && STR_IN_SET(fstype, "bind", "rbind"))
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return true;
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return false;
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}
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