/* SPDX-License-Identifier: LGPL-2.1-or-later */ #include #include #include #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); }