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4d1a6904 LP |
1 | /*-*- Mode: C; c-basic-offset: 8; indent-tabs-mode: nil -*-*/ |
2 | ||
3 | /*** | |
4 | This file is part of systemd. | |
5 | ||
6 | Copyright 2012 Lennart Poettering | |
7 | ||
8 | systemd is free software; you can redistribute it and/or modify it | |
9 | under the terms of the GNU Lesser General Public License as published by | |
10 | the Free Software Foundation; either version 2.1 of the License, or | |
11 | (at your option) any later version. | |
12 | ||
13 | systemd is distributed in the hope that it will be useful, but | |
14 | WITHOUT ANY WARRANTY; without even the implied warranty of | |
15 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU | |
16 | Lesser General Public License for more details. | |
17 | ||
18 | You should have received a copy of the GNU Lesser General Public License | |
19 | along with systemd; If not, see <http://www.gnu.org/licenses/>. | |
20 | ***/ | |
21 | ||
22 | #include <limits.h> | |
23 | #include <sys/param.h> | |
24 | #include <unistd.h> | |
25 | ||
26 | #include "strv.h" | |
27 | #include "utf8.h" | |
28 | #include "util.h" | |
29 | #include "env-util.h" | |
4b549144 | 30 | #include "def.h" |
4d1a6904 LP |
31 | |
32 | #define VALID_CHARS_ENV_NAME \ | |
4b549144 | 33 | DIGITS LETTERS \ |
4d1a6904 LP |
34 | "_" |
35 | ||
36 | #ifndef ARG_MAX | |
37 | #define ARG_MAX ((size_t) sysconf(_SC_ARG_MAX)) | |
38 | #endif | |
39 | ||
40 | static bool env_name_is_valid_n(const char *e, size_t n) { | |
41 | const char *p; | |
42 | ||
43 | if (!e) | |
44 | return false; | |
45 | ||
46 | if (n <= 0) | |
47 | return false; | |
48 | ||
49 | if (e[0] >= '0' && e[0] <= '9') | |
50 | return false; | |
51 | ||
52 | /* POSIX says the overall size of the environment block cannot | |
53 | * be > ARG_MAX, an individual assignment hence cannot be | |
54 | * either. Discounting the equal sign and trailing NUL this | |
55 | * hence leaves ARG_MAX-2 as longest possible variable | |
56 | * name. */ | |
57 | if (n > ARG_MAX - 2) | |
58 | return false; | |
59 | ||
60 | for (p = e; p < e + n; p++) | |
61 | if (!strchr(VALID_CHARS_ENV_NAME, *p)) | |
62 | return false; | |
63 | ||
64 | return true; | |
65 | } | |
66 | ||
67 | bool env_name_is_valid(const char *e) { | |
68 | if (!e) | |
69 | return false; | |
70 | ||
71 | return env_name_is_valid_n(e, strlen(e)); | |
72 | } | |
73 | ||
74 | bool env_value_is_valid(const char *e) { | |
75 | if (!e) | |
76 | return false; | |
77 | ||
78 | if (!utf8_is_valid(e)) | |
79 | return false; | |
80 | ||
81 | if (string_has_cc(e)) | |
82 | return false; | |
83 | ||
84 | /* POSIX says the overall size of the environment block cannot | |
85 | * be > ARG_MAX, an individual assignment hence cannot be | |
86 | * either. Discounting the shortest possible variable name of | |
87 | * length 1, the equal sign and trailing NUL this hence leaves | |
88 | * ARG_MAX-3 as longest possible variable value. */ | |
89 | if (strlen(e) > ARG_MAX - 3) | |
90 | return false; | |
91 | ||
92 | return true; | |
93 | } | |
94 | ||
95 | bool env_assignment_is_valid(const char *e) { | |
96 | const char *eq; | |
97 | ||
98 | eq = strchr(e, '='); | |
99 | if (!eq) | |
100 | return false; | |
101 | ||
102 | if (!env_name_is_valid_n(e, eq - e)) | |
103 | return false; | |
104 | ||
105 | if (!env_value_is_valid(eq + 1)) | |
106 | return false; | |
107 | ||
108 | /* POSIX says the overall size of the environment block cannot | |
109 | * be > ARG_MAX, hence the individual variable assignments | |
5f9cfd4c | 110 | * cannot be either, but let's leave room for one trailing NUL |
4d1a6904 LP |
111 | * byte. */ |
112 | if (strlen(e) > ARG_MAX - 1) | |
113 | return false; | |
114 | ||
115 | return true; | |
116 | } | |
117 | ||
118 | bool strv_env_is_valid(char **e) { | |
119 | char **p, **q; | |
120 | ||
121 | STRV_FOREACH(p, e) { | |
122 | size_t k; | |
123 | ||
124 | if (!env_assignment_is_valid(*p)) | |
125 | return false; | |
126 | ||
127 | /* Check if there are duplicate assginments */ | |
128 | k = strcspn(*p, "="); | |
129 | STRV_FOREACH(q, p + 1) | |
641906e9 | 130 | if (strneq(*p, *q, k) && (*q)[k] == '=') |
4d1a6904 LP |
131 | return false; |
132 | } | |
133 | ||
134 | return true; | |
135 | } | |
136 | ||
123b964a LP |
137 | bool strv_env_name_or_assignment_is_valid(char **l) { |
138 | char **p, **q; | |
139 | ||
140 | STRV_FOREACH(p, l) { | |
141 | if (!env_assignment_is_valid(*p) && !env_name_is_valid(*p)) | |
142 | return false; | |
143 | ||
144 | STRV_FOREACH(q, p + 1) | |
145 | if (streq(*p, *q)) | |
146 | return false; | |
147 | } | |
148 | ||
149 | return true; | |
150 | } | |
151 | ||
4d1a6904 LP |
152 | static int env_append(char **r, char ***k, char **a) { |
153 | assert(r); | |
154 | assert(k); | |
155 | ||
156 | if (!a) | |
157 | return 0; | |
158 | ||
159 | /* Add the entries of a to *k unless they already exist in *r | |
160 | * in which case they are overridden instead. This assumes | |
161 | * there is enough space in the r array. */ | |
162 | ||
163 | for (; *a; a++) { | |
164 | char **j; | |
165 | size_t n; | |
166 | ||
167 | n = strcspn(*a, "="); | |
168 | ||
169 | if ((*a)[n] == '=') | |
170 | n++; | |
171 | ||
172 | for (j = r; j < *k; j++) | |
641906e9 | 173 | if (strneq(*j, *a, n)) |
4d1a6904 LP |
174 | break; |
175 | ||
176 | if (j >= *k) | |
177 | (*k)++; | |
178 | else | |
179 | free(*j); | |
180 | ||
181 | *j = strdup(*a); | |
182 | if (!*j) | |
183 | return -ENOMEM; | |
184 | } | |
185 | ||
186 | return 0; | |
187 | } | |
188 | ||
189 | char **strv_env_merge(unsigned n_lists, ...) { | |
190 | size_t n = 0; | |
191 | char **l, **k, **r; | |
192 | va_list ap; | |
193 | unsigned i; | |
194 | ||
195 | /* Merges an arbitrary number of environment sets */ | |
196 | ||
197 | va_start(ap, n_lists); | |
198 | for (i = 0; i < n_lists; i++) { | |
199 | l = va_arg(ap, char**); | |
200 | n += strv_length(l); | |
201 | } | |
202 | va_end(ap); | |
203 | ||
204 | r = new(char*, n+1); | |
205 | if (!r) | |
206 | return NULL; | |
207 | ||
208 | k = r; | |
209 | ||
210 | va_start(ap, n_lists); | |
211 | for (i = 0; i < n_lists; i++) { | |
212 | l = va_arg(ap, char**); | |
213 | if (env_append(r, &k, l) < 0) | |
214 | goto fail; | |
215 | } | |
216 | va_end(ap); | |
217 | ||
218 | *k = NULL; | |
219 | ||
220 | return r; | |
221 | ||
222 | fail: | |
223 | va_end(ap); | |
224 | strv_free(r); | |
225 | ||
226 | return NULL; | |
227 | } | |
228 | ||
44a6b1b6 | 229 | _pure_ static bool env_match(const char *t, const char *pattern) { |
4d1a6904 LP |
230 | assert(t); |
231 | assert(pattern); | |
232 | ||
233 | /* pattern a matches string a | |
234 | * a matches a= | |
235 | * a matches a=b | |
236 | * a= matches a= | |
237 | * a=b matches a=b | |
238 | * a= does not match a | |
239 | * a=b does not match a= | |
240 | * a=b does not match a | |
241 | * a=b does not match a=c */ | |
242 | ||
243 | if (streq(t, pattern)) | |
244 | return true; | |
245 | ||
246 | if (!strchr(pattern, '=')) { | |
247 | size_t l = strlen(pattern); | |
248 | ||
641906e9 | 249 | return strneq(t, pattern, l) && t[l] == '='; |
4d1a6904 LP |
250 | } |
251 | ||
252 | return false; | |
253 | } | |
254 | ||
255 | char **strv_env_delete(char **x, unsigned n_lists, ...) { | |
256 | size_t n, i = 0; | |
257 | char **k, **r; | |
258 | va_list ap; | |
259 | ||
260 | /* Deletes every entry from x that is mentioned in the other | |
261 | * string lists */ | |
262 | ||
263 | n = strv_length(x); | |
264 | ||
265 | r = new(char*, n+1); | |
266 | if (!r) | |
267 | return NULL; | |
268 | ||
269 | STRV_FOREACH(k, x) { | |
270 | unsigned v; | |
271 | ||
272 | va_start(ap, n_lists); | |
273 | for (v = 0; v < n_lists; v++) { | |
274 | char **l, **j; | |
275 | ||
276 | l = va_arg(ap, char**); | |
277 | STRV_FOREACH(j, l) | |
278 | if (env_match(*k, *j)) | |
279 | goto skip; | |
280 | } | |
281 | va_end(ap); | |
282 | ||
283 | r[i] = strdup(*k); | |
284 | if (!r[i]) { | |
285 | strv_free(r); | |
286 | return NULL; | |
287 | } | |
288 | ||
289 | i++; | |
290 | continue; | |
291 | ||
292 | skip: | |
293 | va_end(ap); | |
294 | } | |
295 | ||
296 | r[i] = NULL; | |
297 | ||
298 | assert(i <= n); | |
299 | ||
300 | return r; | |
301 | } | |
302 | ||
303 | char **strv_env_unset(char **l, const char *p) { | |
304 | ||
305 | char **f, **t; | |
306 | ||
307 | if (!l) | |
308 | return NULL; | |
309 | ||
310 | assert(p); | |
311 | ||
312 | /* Drops every occurrence of the env var setting p in the | |
313 | * string list. edits in-place. */ | |
314 | ||
315 | for (f = t = l; *f; f++) { | |
316 | ||
317 | if (env_match(*f, p)) { | |
318 | free(*f); | |
319 | continue; | |
320 | } | |
321 | ||
322 | *(t++) = *f; | |
323 | } | |
324 | ||
325 | *t = NULL; | |
326 | return l; | |
327 | } | |
328 | ||
329 | char **strv_env_set(char **x, const char *p) { | |
330 | ||
331 | char **k, **r; | |
332 | char* m[2] = { (char*) p, NULL }; | |
333 | ||
334 | /* Overrides the env var setting of p, returns a new copy */ | |
335 | ||
336 | r = new(char*, strv_length(x)+2); | |
337 | if (!r) | |
338 | return NULL; | |
339 | ||
340 | k = r; | |
341 | if (env_append(r, &k, x) < 0) | |
342 | goto fail; | |
343 | ||
344 | if (env_append(r, &k, m) < 0) | |
345 | goto fail; | |
346 | ||
347 | *k = NULL; | |
348 | ||
349 | return r; | |
350 | ||
351 | fail: | |
352 | strv_free(r); | |
353 | return NULL; | |
354 | } | |
355 | ||
356 | char *strv_env_get_n(char **l, const char *name, size_t k) { | |
357 | char **i; | |
358 | ||
359 | assert(name); | |
360 | ||
361 | if (k <= 0) | |
362 | return NULL; | |
363 | ||
364 | STRV_FOREACH(i, l) | |
641906e9 | 365 | if (strneq(*i, name, k) && |
4d1a6904 LP |
366 | (*i)[k] == '=') |
367 | return *i + k + 1; | |
368 | ||
369 | return NULL; | |
370 | } | |
371 | ||
372 | char *strv_env_get(char **l, const char *name) { | |
373 | assert(name); | |
374 | ||
375 | return strv_env_get_n(l, name, strlen(name)); | |
376 | } | |
377 | ||
ebc05a09 | 378 | char **strv_env_clean_log(char **e, const char *message) { |
4d1a6904 LP |
379 | char **p, **q; |
380 | int k = 0; | |
381 | ||
382 | STRV_FOREACH(p, e) { | |
383 | size_t n; | |
384 | bool duplicate = false; | |
385 | ||
386 | if (!env_assignment_is_valid(*p)) { | |
ebc05a09 HH |
387 | if (message) |
388 | log_error("Ignoring invalid environment '%s': %s", *p, message); | |
4d1a6904 LP |
389 | free(*p); |
390 | continue; | |
391 | } | |
392 | ||
393 | n = strcspn(*p, "="); | |
394 | STRV_FOREACH(q, p + 1) | |
641906e9 | 395 | if (strneq(*p, *q, n) && (*q)[n] == '=') { |
4d1a6904 LP |
396 | duplicate = true; |
397 | break; | |
398 | } | |
399 | ||
400 | if (duplicate) { | |
401 | free(*p); | |
402 | continue; | |
403 | } | |
404 | ||
405 | e[k++] = *p; | |
406 | } | |
407 | ||
408 | e[k] = NULL; | |
409 | return e; | |
410 | } | |
ebc05a09 HH |
411 | |
412 | char **strv_env_clean(char **e) { | |
413 | return strv_env_clean_log(e, NULL); | |
414 | } |