| /* SPDX-License-Identifier: LGPL-2.1-or-later */ |
| |
| #include <errno.h> |
| #include <stdio.h> |
| #include <stdlib.h> |
| |
| #include "alloc-util.h" |
| #include "device-nodes.h" |
| #include "fstab-util.h" |
| #include "initrd-util.h" |
| #include "macro.h" |
| #include "mount-util.h" |
| #include "nulstr-util.h" |
| #include "parse-util.h" |
| #include "path-util.h" |
| #include "string-util.h" |
| #include "strv.h" |
| |
| int fstab_has_fstype(const char *fstype) { |
| _cleanup_endmntent_ FILE *f = NULL; |
| struct mntent *m; |
| |
| f = setmntent(fstab_path(), "re"); |
| if (!f) |
| return errno == ENOENT ? false : -errno; |
| |
| for (;;) { |
| errno = 0; |
| m = getmntent(f); |
| if (!m) |
| return errno != 0 ? -errno : false; |
| |
| if (streq(m->mnt_type, fstype)) |
| return true; |
| } |
| return false; |
| } |
| |
| bool fstab_is_extrinsic(const char *mount, const char *opts) { |
| |
| /* Don't bother with the OS data itself */ |
| if (PATH_IN_SET(mount, |
| "/", |
| "/usr", |
| "/etc")) |
| return true; |
| |
| if (PATH_STARTSWITH_SET(mount, |
| "/run/initramfs", /* This should stay around from before we boot until after we shutdown */ |
| "/proc", /* All of this is API VFS */ |
| "/sys", /* … dito … */ |
| "/dev")) /* … dito … */ |
| return true; |
| |
| /* If this is an initrd mount, and we are not in the initrd, then leave |
| * this around forever, too. */ |
| if (opts && fstab_test_option(opts, "x-initrd.mount\0") && !in_initrd()) |
| return true; |
| |
| return false; |
| } |
| |
| int fstab_is_mount_point(const char *mount) { |
| _cleanup_endmntent_ FILE *f = NULL; |
| struct mntent *m; |
| |
| f = setmntent(fstab_path(), "re"); |
| if (!f) |
| return errno == ENOENT ? false : -errno; |
| |
| for (;;) { |
| errno = 0; |
| m = getmntent(f); |
| if (!m) |
| return errno != 0 ? -errno : false; |
| |
| if (path_equal(m->mnt_dir, mount)) |
| return true; |
| } |
| return false; |
| } |
| |
| int fstab_filter_options( |
| const char *opts, |
| const char *names, |
| const char **ret_namefound, |
| char **ret_value, |
| char ***ret_values, |
| char **ret_filtered) { |
| |
| const char *namefound = NULL, *x; |
| _cleanup_strv_free_ char **stor = NULL, **values = NULL; |
| _cleanup_free_ char *value = NULL, **filtered = NULL; |
| int r; |
| |
| assert(names && *names); |
| assert(!(ret_value && ret_values)); |
| |
| if (!opts) |
| goto answer; |
| |
| /* Finds any options matching 'names', and returns: |
| * - the last matching option name in ret_namefound, |
| * - the last matching value in ret_value, |
| * - any matching values in ret_values, |
| * - the rest of the option string in ret_filtered. |
| * |
| * If !ret_value and !ret_values and !ret_filtered, this function is not allowed to fail. |
| * |
| * Returns negative on error, true if any matching options were found, false otherwise. */ |
| |
| if (ret_filtered || ret_value || ret_values) { |
| /* For backwards compatibility, we need to pass-through escape characters. |
| * The only ones we "consume" are the ones used as "\," or "\\". */ |
| r = strv_split_full(&stor, opts, ",", EXTRACT_UNESCAPE_SEPARATORS | EXTRACT_UNESCAPE_RELAX); |
| if (r < 0) |
| return r; |
| |
| filtered = memdup(stor, sizeof(char*) * (strv_length(stor) + 1)); |
| if (!filtered) |
| return -ENOMEM; |
| |
| char **t = filtered; |
| for (char **s = t; *s; s++) { |
| NULSTR_FOREACH(name, names) { |
| x = startswith(*s, name); |
| if (!x) |
| continue; |
| /* Match name, but when ret_values, only when followed by assignment. */ |
| if (*x == '=' || (!ret_values && *x == '\0')) { |
| /* Keep the last occurrence found */ |
| namefound = name; |
| goto found; |
| } |
| } |
| |
| *t = *s; |
| t++; |
| continue; |
| found: |
| if (ret_value || ret_values) { |
| assert(IN_SET(*x, '=', '\0')); |
| |
| if (ret_value) { |
| r = free_and_strdup(&value, *x == '=' ? x + 1 : NULL); |
| if (r < 0) |
| return r; |
| } else if (*x) { |
| r = strv_extend(&values, x + 1); |
| if (r < 0) |
| return r; |
| } |
| } |
| } |
| *t = NULL; |
| } else |
| for (const char *word = opts;;) { |
| const char *end = word; |
| |
| /* Look for a *non-escaped* comma separator. Only commas and backslashes can be |
| * escaped, so "\," and "\\" are the only valid escape sequences, and we can do a |
| * very simple test here. */ |
| for (;;) { |
| end += strcspn(end, ",\\"); |
| |
| if (IN_SET(*end, ',', '\0')) |
| break; |
| assert(*end == '\\'); |
| end ++; /* Skip the backslash */ |
| if (*end != '\0') |
| end ++; /* Skip the escaped char, but watch out for a trailing comma */ |
| } |
| |
| NULSTR_FOREACH(name, names) { |
| if (end < word + strlen(name)) |
| continue; |
| if (!strneq(word, name, strlen(name))) |
| continue; |
| |
| /* We know that the string is NUL terminated, so *x is valid */ |
| x = word + strlen(name); |
| if (IN_SET(*x, '\0', '=', ',')) { |
| namefound = name; |
| break; |
| } |
| } |
| |
| if (*end) |
| word = end + 1; |
| else |
| break; |
| } |
| |
| answer: |
| if (ret_namefound) |
| *ret_namefound = namefound; |
| if (ret_filtered) { |
| char *f; |
| |
| f = strv_join_full(filtered, ",", NULL, true); |
| if (!f) |
| return -ENOMEM; |
| |
| *ret_filtered = f; |
| } |
| if (ret_value) |
| *ret_value = TAKE_PTR(value); |
| if (ret_values) |
| *ret_values = TAKE_PTR(values); |
| |
| return !!namefound; |
| } |
| |
| int fstab_find_pri(const char *options, int *ret) { |
| _cleanup_free_ char *opt = NULL; |
| int r, pri; |
| |
| assert(ret); |
| |
| r = fstab_filter_options(options, "pri\0", NULL, &opt, NULL, NULL); |
| if (r < 0) |
| return r; |
| if (r == 0 || !opt) |
| return 0; |
| |
| r = safe_atoi(opt, &pri); |
| if (r < 0) |
| return r; |
| |
| *ret = pri; |
| return 1; |
| } |
| |
| static char *unquote(const char *s, const char* quotes) { |
| size_t l; |
| assert(s); |
| |
| /* This is rather stupid, simply removes the heading and |
| * trailing quotes if there is one. Doesn't care about |
| * escaping or anything. |
| * |
| * DON'T USE THIS FOR NEW CODE ANYMORE! */ |
| |
| l = strlen(s); |
| if (l < 2) |
| return strdup(s); |
| |
| if (strchr(quotes, s[0]) && s[l-1] == s[0]) |
| return strndup(s+1, l-2); |
| |
| return strdup(s); |
| } |
| |
| static char *tag_to_udev_node(const char *tagvalue, const char *by) { |
| _cleanup_free_ char *t = NULL, *u = NULL; |
| size_t enc_len; |
| |
| u = unquote(tagvalue, QUOTES); |
| if (!u) |
| return NULL; |
| |
| enc_len = strlen(u) * 4 + 1; |
| t = new(char, enc_len); |
| if (!t) |
| return NULL; |
| |
| if (encode_devnode_name(u, t, enc_len) < 0) |
| return NULL; |
| |
| return strjoin("/dev/disk/by-", by, "/", t); |
| } |
| |
| char *fstab_node_to_udev_node(const char *p) { |
| assert(p); |
| |
| if (startswith(p, "LABEL=")) |
| return tag_to_udev_node(p+6, "label"); |
| |
| if (startswith(p, "UUID=")) |
| return tag_to_udev_node(p+5, "uuid"); |
| |
| if (startswith(p, "PARTUUID=")) |
| return tag_to_udev_node(p+9, "partuuid"); |
| |
| if (startswith(p, "PARTLABEL=")) |
| return tag_to_udev_node(p+10, "partlabel"); |
| |
| return strdup(p); |
| } |
