/*-*- Mode: C; c-basic-offset: 8; indent-tabs-mode: nil -*-*/ /*** This file is part of systemd. Copyright 2015 Zbigniew Jędrzejewski-Szmek systemd is free software; you can redistribute it and/or modify it under the terms of the GNU Lesser General Public License as published by the Free Software Foundation; either version 2.1 of the License, or (at your option) any later version. systemd 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 Lesser General Public License for more details. You should have received a copy of the GNU Lesser General Public License along with systemd; If not, see <http://www.gnu.org/licenses/>. ***/ #include "alloc-util.h" #include "device-nodes.h" #include "fstab-util.h" #include "mount-util.h" #include "parse-util.h" #include "path-util.h" #include "string-util.h" #include "strv.h" #include "util.h" bool fstab_is_mount_point(const char *mount) { _cleanup_endmntent_ FILE *f = NULL; struct mntent *m; f = setmntent("/etc/fstab", "r"); if (!f) return false; while ((m = getmntent(f))) if (path_equal(m->mnt_dir, mount)) return true; return false; } int fstab_filter_options(const char *opts, const char *names, const char **namefound, char **value, char **filtered) { const char *name, *n = NULL, *x; _cleanup_strv_free_ char **stor = NULL; _cleanup_free_ char *v = NULL, **strv = NULL; assert(names && *names); if (!opts) goto answer; /* If !value and !filtered, this function is not allowed to fail. */ if (!filtered) { const char *word, *state; size_t l; FOREACH_WORD_SEPARATOR(word, l, opts, ",", state) NULSTR_FOREACH(name, names) { if (l < 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', '=', ',')) { n = name; if (value) { free(v); if (IN_SET(*x, '\0', ',')) v = NULL; else { assert(*x == '='); x++; v = strndup(x, l - strlen(name) - 1); if (!v) return -ENOMEM; } } } } } else { char **t, **s; stor = strv_split(opts, ","); if (!stor) return -ENOMEM; strv = memdup(stor, sizeof(char*) * (strv_length(stor) + 1)); if (!strv) return -ENOMEM; for (s = t = strv; *s; s++) { NULSTR_FOREACH(name, names) { x = startswith(*s, name); if (x && IN_SET(*x, '\0', '=')) goto found; } *t = *s; t++; continue; found: /* Keep the last occurence found */ n = name; if (value) { free(v); if (*x == '\0') v = NULL; else { assert(*x == '='); x++; v = strdup(x); if (!v) return -ENOMEM; } } } *t = NULL; } answer: if (namefound) *namefound = n; if (filtered) { char *f; f = strv_join(strv, ","); if (!f) return -ENOMEM; *filtered = f; } if (value) { *value = v; v = NULL; } return !!n; } int fstab_extract_values(const char *opts, const char *name, char ***values) { _cleanup_strv_free_ char **optsv = NULL, **res = NULL; char **s; assert(opts); assert(name); assert(values); optsv = strv_split(opts, ","); if (!optsv) return -ENOMEM; STRV_FOREACH(s, optsv) { char *arg; int r; arg = startswith(*s, name); if (!arg || *arg != '=') continue; r = strv_extend(&res, arg + 1); if (r < 0) return r; } *values = res; res = NULL; return !!*values; } int fstab_find_pri(const char *options, int *ret) { _cleanup_free_ char *opt = NULL; int r; unsigned pri; assert(ret); r = fstab_filter_options(options, "pri\0", NULL, &opt, NULL); if (r < 0) return r; if (r == 0 || !opt) return 0; r = safe_atou(opt, &pri); if (r < 0) return r; if ((int) pri < 0) return -ERANGE; *ret = (int) 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, NULL); } 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); }