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52ad194e | 1 | /* SPDX-License-Identifier: LGPL-2.1+ */ |
e735f4d4 MP |
2 | /*** |
3 | This file is part of systemd. | |
4 | ||
5 | Copyright 2015 Zbigniew Jędrzejewski-Szmek | |
6 | ||
7 | systemd is free software; you can redistribute it and/or modify it | |
8 | under the terms of the GNU Lesser General Public License as published by | |
9 | the Free Software Foundation; either version 2.1 of the License, or | |
10 | (at your option) any later version. | |
11 | ||
12 | systemd is distributed in the hope that it will be useful, but | |
13 | WITHOUT ANY WARRANTY; without even the implied warranty of | |
14 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU | |
15 | Lesser General Public License for more details. | |
16 | ||
17 | You should have received a copy of the GNU Lesser General Public License | |
18 | along with systemd; If not, see <http://www.gnu.org/licenses/>. | |
19 | ***/ | |
20 | ||
4c89c718 MP |
21 | #include <errno.h> |
22 | #include <mntent.h> | |
23 | #include <stdio.h> | |
24 | #include <stdlib.h> | |
25 | #include <string.h> | |
26 | ||
db2df898 MP |
27 | #include "alloc-util.h" |
28 | #include "device-nodes.h" | |
e735f4d4 | 29 | #include "fstab-util.h" |
4c89c718 | 30 | #include "macro.h" |
db2df898 MP |
31 | #include "mount-util.h" |
32 | #include "parse-util.h" | |
6300502b | 33 | #include "path-util.h" |
db2df898 | 34 | #include "string-util.h" |
e735f4d4 MP |
35 | #include "strv.h" |
36 | #include "util.h" | |
37 | ||
81c58355 | 38 | int fstab_has_fstype(const char *fstype) { |
6300502b MP |
39 | _cleanup_endmntent_ FILE *f = NULL; |
40 | struct mntent *m; | |
41 | ||
2897b343 | 42 | f = setmntent("/etc/fstab", "re"); |
6300502b | 43 | if (!f) |
81c58355 | 44 | return errno == ENOENT ? false : -errno; |
6300502b | 45 | |
81c58355 MB |
46 | for (;;) { |
47 | errno = 0; | |
48 | m = getmntent(f); | |
49 | if (!m) | |
50 | return errno != 0 ? -errno : false; | |
51 | ||
52 | if (streq(m->mnt_type, fstype)) | |
6300502b | 53 | return true; |
81c58355 MB |
54 | } |
55 | return false; | |
56 | } | |
57 | ||
58 | int fstab_is_mount_point(const char *mount) { | |
59 | _cleanup_endmntent_ FILE *f = NULL; | |
60 | struct mntent *m; | |
6300502b | 61 | |
81c58355 MB |
62 | f = setmntent("/etc/fstab", "re"); |
63 | if (!f) | |
64 | return errno == ENOENT ? false : -errno; | |
65 | ||
66 | for (;;) { | |
67 | errno = 0; | |
68 | m = getmntent(f); | |
69 | if (!m) | |
70 | return errno != 0 ? -errno : false; | |
71 | ||
72 | if (path_equal(m->mnt_dir, mount)) | |
73 | return true; | |
74 | } | |
6300502b MP |
75 | return false; |
76 | } | |
77 | ||
e735f4d4 MP |
78 | int fstab_filter_options(const char *opts, const char *names, |
79 | const char **namefound, char **value, char **filtered) { | |
80 | const char *name, *n = NULL, *x; | |
81 | _cleanup_strv_free_ char **stor = NULL; | |
82 | _cleanup_free_ char *v = NULL, **strv = NULL; | |
83 | ||
84 | assert(names && *names); | |
85 | ||
86 | if (!opts) | |
87 | goto answer; | |
88 | ||
89 | /* If !value and !filtered, this function is not allowed to fail. */ | |
90 | ||
91 | if (!filtered) { | |
92 | const char *word, *state; | |
93 | size_t l; | |
94 | ||
95 | FOREACH_WORD_SEPARATOR(word, l, opts, ",", state) | |
96 | NULSTR_FOREACH(name, names) { | |
97 | if (l < strlen(name)) | |
98 | continue; | |
99 | if (!strneq(word, name, strlen(name))) | |
100 | continue; | |
101 | ||
102 | /* we know that the string is NUL | |
103 | * terminated, so *x is valid */ | |
104 | x = word + strlen(name); | |
105 | if (IN_SET(*x, '\0', '=', ',')) { | |
106 | n = name; | |
107 | if (value) { | |
108 | free(v); | |
109 | if (IN_SET(*x, '\0', ',')) | |
110 | v = NULL; | |
111 | else { | |
112 | assert(*x == '='); | |
113 | x++; | |
114 | v = strndup(x, l - strlen(name) - 1); | |
115 | if (!v) | |
116 | return -ENOMEM; | |
117 | } | |
118 | } | |
119 | } | |
120 | } | |
121 | } else { | |
122 | char **t, **s; | |
123 | ||
124 | stor = strv_split(opts, ","); | |
125 | if (!stor) | |
126 | return -ENOMEM; | |
127 | strv = memdup(stor, sizeof(char*) * (strv_length(stor) + 1)); | |
128 | if (!strv) | |
129 | return -ENOMEM; | |
130 | ||
131 | for (s = t = strv; *s; s++) { | |
132 | NULSTR_FOREACH(name, names) { | |
133 | x = startswith(*s, name); | |
134 | if (x && IN_SET(*x, '\0', '=')) | |
135 | goto found; | |
136 | } | |
137 | ||
138 | *t = *s; | |
139 | t++; | |
140 | continue; | |
141 | found: | |
142 | /* Keep the last occurence found */ | |
143 | n = name; | |
144 | if (value) { | |
145 | free(v); | |
146 | if (*x == '\0') | |
147 | v = NULL; | |
148 | else { | |
149 | assert(*x == '='); | |
150 | x++; | |
151 | v = strdup(x); | |
152 | if (!v) | |
153 | return -ENOMEM; | |
154 | } | |
155 | } | |
156 | } | |
157 | *t = NULL; | |
158 | } | |
159 | ||
160 | answer: | |
161 | if (namefound) | |
162 | *namefound = n; | |
163 | if (filtered) { | |
164 | char *f; | |
165 | ||
166 | f = strv_join(strv, ","); | |
167 | if (!f) | |
168 | return -ENOMEM; | |
169 | ||
170 | *filtered = f; | |
171 | } | |
172 | if (value) { | |
173 | *value = v; | |
174 | v = NULL; | |
175 | } | |
176 | ||
177 | return !!n; | |
178 | } | |
179 | ||
e3bff60a MP |
180 | int fstab_extract_values(const char *opts, const char *name, char ***values) { |
181 | _cleanup_strv_free_ char **optsv = NULL, **res = NULL; | |
182 | char **s; | |
183 | ||
184 | assert(opts); | |
185 | assert(name); | |
186 | assert(values); | |
187 | ||
188 | optsv = strv_split(opts, ","); | |
189 | if (!optsv) | |
190 | return -ENOMEM; | |
191 | ||
192 | STRV_FOREACH(s, optsv) { | |
193 | char *arg; | |
194 | int r; | |
195 | ||
196 | arg = startswith(*s, name); | |
197 | if (!arg || *arg != '=') | |
198 | continue; | |
199 | r = strv_extend(&res, arg + 1); | |
200 | if (r < 0) | |
201 | return r; | |
202 | } | |
203 | ||
204 | *values = res; | |
205 | res = NULL; | |
206 | ||
207 | return !!*values; | |
208 | } | |
209 | ||
e735f4d4 MP |
210 | int fstab_find_pri(const char *options, int *ret) { |
211 | _cleanup_free_ char *opt = NULL; | |
212 | int r; | |
213 | unsigned pri; | |
214 | ||
215 | assert(ret); | |
216 | ||
217 | r = fstab_filter_options(options, "pri\0", NULL, &opt, NULL); | |
218 | if (r < 0) | |
219 | return r; | |
220 | if (r == 0 || !opt) | |
221 | return 0; | |
222 | ||
223 | r = safe_atou(opt, &pri); | |
224 | if (r < 0) | |
225 | return r; | |
226 | ||
227 | if ((int) pri < 0) | |
228 | return -ERANGE; | |
229 | ||
230 | *ret = (int) pri; | |
231 | return 1; | |
232 | } | |
db2df898 MP |
233 | |
234 | static char *unquote(const char *s, const char* quotes) { | |
235 | size_t l; | |
236 | assert(s); | |
237 | ||
238 | /* This is rather stupid, simply removes the heading and | |
239 | * trailing quotes if there is one. Doesn't care about | |
240 | * escaping or anything. | |
241 | * | |
2897b343 | 242 | * DON'T USE THIS FOR NEW CODE ANYMORE! */ |
db2df898 MP |
243 | |
244 | l = strlen(s); | |
245 | if (l < 2) | |
246 | return strdup(s); | |
247 | ||
248 | if (strchr(quotes, s[0]) && s[l-1] == s[0]) | |
249 | return strndup(s+1, l-2); | |
250 | ||
251 | return strdup(s); | |
252 | } | |
253 | ||
254 | static char *tag_to_udev_node(const char *tagvalue, const char *by) { | |
255 | _cleanup_free_ char *t = NULL, *u = NULL; | |
256 | size_t enc_len; | |
257 | ||
258 | u = unquote(tagvalue, QUOTES); | |
259 | if (!u) | |
260 | return NULL; | |
261 | ||
262 | enc_len = strlen(u) * 4 + 1; | |
263 | t = new(char, enc_len); | |
264 | if (!t) | |
265 | return NULL; | |
266 | ||
267 | if (encode_devnode_name(u, t, enc_len) < 0) | |
268 | return NULL; | |
269 | ||
2897b343 | 270 | return strjoin("/dev/disk/by-", by, "/", t); |
db2df898 MP |
271 | } |
272 | ||
273 | char *fstab_node_to_udev_node(const char *p) { | |
274 | assert(p); | |
275 | ||
276 | if (startswith(p, "LABEL=")) | |
277 | return tag_to_udev_node(p+6, "label"); | |
278 | ||
279 | if (startswith(p, "UUID=")) | |
280 | return tag_to_udev_node(p+5, "uuid"); | |
281 | ||
282 | if (startswith(p, "PARTUUID=")) | |
283 | return tag_to_udev_node(p+9, "partuuid"); | |
284 | ||
285 | if (startswith(p, "PARTLABEL=")) | |
286 | return tag_to_udev_node(p+10, "partlabel"); | |
287 | ||
288 | return strdup(p); | |
289 | } |