| /*** |
| 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 <errno.h> |
| #include <mntent.h> |
| #include <stdio.h> |
| #include <stdlib.h> |
| #include <string.h> |
| |
| #include "alloc-util.h" |
| #include "device-nodes.h" |
| #include "fstab-util.h" |
| #include "macro.h" |
| #include "mount-util.h" |
| #include "parse-util.h" |
| #include "path-util.h" |
| #include "string-util.h" |
| #include "strv.h" |
| #include "util.h" |
| |
| int fstab_has_fstype(const char *fstype) { |
| _cleanup_endmntent_ FILE *f = NULL; |
| struct mntent *m; |
| |
| f = setmntent("/etc/fstab", "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; |
| } |
| |
| int fstab_is_mount_point(const char *mount) { |
| _cleanup_endmntent_ FILE *f = NULL; |
| struct mntent *m; |
| |
| f = setmntent("/etc/fstab", "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 **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); |
| } |
| |
| 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); |
| } |