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8e1bd70d LP |
1 | /*-*- Mode: C; c-basic-offset: 8; indent-tabs-mode: nil -*-*/ |
2 | ||
3 | /*** | |
4 | This file is part of systemd. | |
5 | ||
6 | Copyright 2010 Lennart Poettering | |
7 | ||
8 | systemd is free software; you can redistribute it and/or modify it | |
5430f7f2 LP |
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 | |
8e1bd70d LP |
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 | |
5430f7f2 | 16 | Lesser General Public License for more details. |
8e1bd70d | 17 | |
5430f7f2 | 18 | You should have received a copy of the GNU Lesser General Public License |
8e1bd70d LP |
19 | along with systemd; If not, see <http://www.gnu.org/licenses/>. |
20 | ***/ | |
21 | ||
22 | #include <stdlib.h> | |
23 | #include <stdbool.h> | |
24 | #include <errno.h> | |
25 | #include <string.h> | |
8e1bd70d LP |
26 | #include <stdio.h> |
27 | #include <limits.h> | |
7a2a0b90 | 28 | #include <getopt.h> |
8e1bd70d LP |
29 | |
30 | #include "log.h" | |
db1413d7 | 31 | #include "strv.h" |
8e1bd70d | 32 | #include "util.h" |
86fc77c4 | 33 | #include "hashmap.h" |
9eb977db | 34 | #include "path-util.h" |
2c21044f | 35 | #include "conf-files.h" |
a5c32cff | 36 | #include "fileio.h" |
eb9da376 | 37 | #include "build.h" |
8e1bd70d | 38 | |
fabe5c0e | 39 | static char **arg_prefixes = NULL; |
8e1bd70d | 40 | |
fabe5c0e LP |
41 | static const char conf_file_dirs[] = |
42 | "/etc/sysctl.d\0" | |
43 | "/run/sysctl.d\0" | |
44 | "/usr/local/lib/sysctl.d\0" | |
45 | "/usr/lib/sysctl.d\0" | |
46 | #ifdef HAVE_SPLIT_USR | |
47 | "/lib/sysctl.d\0" | |
48 | #endif | |
49 | ; | |
50 | ||
51 | static char *normalize_sysctl(char *s) { | |
52 | char *n; | |
53 | ||
54 | for (n = s; *n; n++) | |
55 | if (*n == '.') | |
56 | *n = '/'; | |
57 | ||
58 | return s; | |
59 | } | |
7a2a0b90 | 60 | |
c1b664d0 | 61 | static int apply_sysctl(const char *property, const char *value) { |
fabe5c0e LP |
62 | _cleanup_free_ char *p = NULL; |
63 | char *n; | |
c1b664d0 | 64 | int r = 0, k; |
8e1bd70d LP |
65 | |
66 | log_debug("Setting '%s' to '%s'", property, value); | |
67 | ||
fabe5c0e | 68 | p = new(char, sizeof("/proc/sys/") + strlen(property)); |
0d0f0c50 SL |
69 | if (!p) |
70 | return log_oom(); | |
8e1bd70d | 71 | |
fabe5c0e | 72 | n = stpcpy(p, "/proc/sys/"); |
8e1bd70d LP |
73 | strcpy(n, property); |
74 | ||
f68c5a70 LP |
75 | if (!strv_isempty(arg_prefixes)) { |
76 | char **i; | |
77 | bool good = false; | |
78 | ||
79 | STRV_FOREACH(i, arg_prefixes) | |
80 | if (path_startswith(p, *i)) { | |
81 | good = true; | |
82 | break; | |
83 | } | |
84 | ||
85 | if (!good) { | |
86 | log_debug("Skipping %s", p); | |
f68c5a70 LP |
87 | return 0; |
88 | } | |
7a2a0b90 LP |
89 | } |
90 | ||
574d5f2d | 91 | k = write_string_file(p, value); |
7a2a0b90 | 92 | if (k < 0) { |
c1b664d0 LP |
93 | log_full(k == -ENOENT ? LOG_DEBUG : LOG_WARNING, |
94 | "Failed to write '%s' to '%s': %s", value, p, strerror(-k)); | |
24a35973 | 95 | |
c1b664d0 LP |
96 | if (k != -ENOENT && r == 0) |
97 | r = k; | |
8e1bd70d LP |
98 | } |
99 | ||
c1b664d0 | 100 | return r; |
8e1bd70d LP |
101 | } |
102 | ||
fabe5c0e | 103 | static int apply_all(Hashmap *sysctl_options) { |
86fc77c4 MS |
104 | int r = 0; |
105 | char *property, *value; | |
106 | Iterator i; | |
107 | ||
fabe5c0e LP |
108 | assert(sysctl_options); |
109 | ||
86fc77c4 MS |
110 | HASHMAP_FOREACH_KEY(value, property, sysctl_options, i) { |
111 | int k; | |
112 | ||
113 | k = apply_sysctl(property, value); | |
114 | if (k < 0 && r == 0) | |
115 | r = k; | |
116 | } | |
117 | return r; | |
118 | } | |
119 | ||
fabe5c0e LP |
120 | static int parse_file(Hashmap *sysctl_options, const char *path, bool ignore_enoent) { |
121 | _cleanup_fclose_ FILE *f = NULL; | |
122 | int r; | |
8e1bd70d LP |
123 | |
124 | assert(path); | |
125 | ||
fabe5c0e LP |
126 | r = search_and_fopen_nulstr(path, "re", conf_file_dirs, &f); |
127 | if (r < 0) { | |
6f6fad96 | 128 | if (ignore_enoent && r == -ENOENT) |
c1b664d0 LP |
129 | return 0; |
130 | ||
fabe5c0e LP |
131 | log_error("Failed to open file '%s', ignoring: %s", path, strerror(-r)); |
132 | return r; | |
8e1bd70d LP |
133 | } |
134 | ||
86fc77c4 | 135 | log_debug("parse: %s\n", path); |
8e1bd70d | 136 | while (!feof(f)) { |
fabe5c0e | 137 | char l[LINE_MAX], *p, *value, *new_value, *property, *existing; |
04bf3c1a | 138 | void *v; |
fabe5c0e | 139 | int k; |
8e1bd70d LP |
140 | |
141 | if (!fgets(l, sizeof(l), f)) { | |
142 | if (feof(f)) | |
143 | break; | |
144 | ||
145 | log_error("Failed to read file '%s', ignoring: %m", path); | |
fabe5c0e | 146 | return -errno; |
8e1bd70d LP |
147 | } |
148 | ||
149 | p = strstrip(l); | |
8e1bd70d LP |
150 | if (!*p) |
151 | continue; | |
152 | ||
d3b6d0c2 | 153 | if (strchr(COMMENTS "\n", *p)) |
8e1bd70d LP |
154 | continue; |
155 | ||
86fc77c4 MS |
156 | value = strchr(p, '='); |
157 | if (!value) { | |
8e1bd70d | 158 | log_error("Line is not an assignment in file '%s': %s", path, value); |
c1b664d0 LP |
159 | |
160 | if (r == 0) | |
161 | r = -EINVAL; | |
8e1bd70d LP |
162 | continue; |
163 | } | |
164 | ||
165 | *value = 0; | |
166 | value++; | |
167 | ||
fabe5c0e LP |
168 | p = normalize_sysctl(strstrip(p)); |
169 | value = strstrip(value); | |
170 | ||
04bf3c1a | 171 | existing = hashmap_get2(sysctl_options, p, &v); |
fabe5c0e | 172 | if (existing) { |
04bf3c1a KS |
173 | if (streq(value, existing)) |
174 | continue; | |
fabe5c0e | 175 | |
04bf3c1a KS |
176 | log_info("Overwriting earlier assignment of %s in file '%s'.", p, path); |
177 | free(hashmap_remove(sysctl_options, p)); | |
178 | free(v); | |
86fc77c4 MS |
179 | } |
180 | ||
fabe5c0e LP |
181 | property = strdup(p); |
182 | if (!property) | |
183 | return log_oom(); | |
184 | ||
185 | new_value = strdup(value); | |
86fc77c4 MS |
186 | if (!new_value) { |
187 | free(property); | |
fabe5c0e | 188 | return log_oom(); |
86fc77c4 MS |
189 | } |
190 | ||
fabe5c0e LP |
191 | k = hashmap_put(sysctl_options, property, new_value); |
192 | if (k < 0) { | |
04bf3c1a | 193 | log_error("Failed to add sysctl variable %s to hashmap: %s", property, strerror(-k)); |
86fc77c4 MS |
194 | free(property); |
195 | free(new_value); | |
fabe5c0e | 196 | return k; |
86fc77c4 | 197 | } |
8e1bd70d LP |
198 | } |
199 | ||
c1b664d0 | 200 | return r; |
8e1bd70d LP |
201 | } |
202 | ||
7a2a0b90 LP |
203 | static int help(void) { |
204 | ||
205 | printf("%s [OPTIONS...] [CONFIGURATION FILE...]\n\n" | |
206 | "Applies kernel sysctl settings.\n\n" | |
207 | " -h --help Show this help\n" | |
eb9da376 | 208 | " --version Show package version\n" |
7a2a0b90 LP |
209 | " --prefix=PATH Only apply rules that apply to paths with the specified prefix\n", |
210 | program_invocation_short_name); | |
211 | ||
212 | return 0; | |
213 | } | |
214 | ||
215 | static int parse_argv(int argc, char *argv[]) { | |
216 | ||
217 | enum { | |
eb9da376 | 218 | ARG_VERSION = 0x100, |
7a2a0b90 LP |
219 | ARG_PREFIX |
220 | }; | |
221 | ||
222 | static const struct option options[] = { | |
223 | { "help", no_argument, NULL, 'h' }, | |
eb9da376 | 224 | { "version", no_argument, NULL, ARG_VERSION }, |
7a2a0b90 | 225 | { "prefix", required_argument, NULL, ARG_PREFIX }, |
eb9da376 | 226 | {} |
7a2a0b90 LP |
227 | }; |
228 | ||
229 | int c; | |
230 | ||
231 | assert(argc >= 0); | |
232 | assert(argv); | |
233 | ||
234 | while ((c = getopt_long(argc, argv, "h", options, NULL)) >= 0) { | |
235 | ||
236 | switch (c) { | |
237 | ||
238 | case 'h': | |
eb9da376 LP |
239 | return help(); |
240 | ||
241 | case ARG_VERSION: | |
242 | puts(PACKAGE_STRING); | |
243 | puts(SYSTEMD_FEATURES); | |
7a2a0b90 LP |
244 | return 0; |
245 | ||
246 | case ARG_PREFIX: { | |
247 | char *p; | |
f68c5a70 | 248 | char **l; |
7a2a0b90 LP |
249 | |
250 | for (p = optarg; *p; p++) | |
251 | if (*p == '.') | |
252 | *p = '/'; | |
253 | ||
f68c5a70 | 254 | l = strv_append(arg_prefixes, optarg); |
0d0f0c50 SL |
255 | if (!l) |
256 | return log_oom(); | |
f68c5a70 LP |
257 | |
258 | strv_free(arg_prefixes); | |
259 | arg_prefixes = l; | |
7a2a0b90 LP |
260 | |
261 | break; | |
262 | } | |
263 | ||
264 | case '?': | |
265 | return -EINVAL; | |
266 | ||
267 | default: | |
eb9da376 | 268 | assert_not_reached("Unhandled option"); |
7a2a0b90 LP |
269 | } |
270 | } | |
271 | ||
272 | return 1; | |
273 | } | |
274 | ||
8e1bd70d | 275 | int main(int argc, char *argv[]) { |
0187f62b | 276 | int r = 0, k; |
fabe5c0e | 277 | Hashmap *sysctl_options; |
8e1bd70d | 278 | |
7a2a0b90 LP |
279 | r = parse_argv(argc, argv); |
280 | if (r <= 0) | |
281 | return r < 0 ? EXIT_FAILURE : EXIT_SUCCESS; | |
282 | ||
8e1bd70d LP |
283 | log_set_target(LOG_TARGET_AUTO); |
284 | log_parse_environment(); | |
285 | log_open(); | |
286 | ||
4c12626c LP |
287 | umask(0022); |
288 | ||
86fc77c4 MS |
289 | sysctl_options = hashmap_new(string_hash_func, string_compare_func); |
290 | if (!sysctl_options) { | |
291 | r = log_oom(); | |
292 | goto finish; | |
293 | } | |
294 | ||
0187f62b LP |
295 | r = 0; |
296 | ||
de19ece7 LP |
297 | if (argc > optind) { |
298 | int i; | |
299 | ||
300 | for (i = optind; i < argc; i++) { | |
fabe5c0e LP |
301 | k = parse_file(sysctl_options, argv[i], false); |
302 | if (k < 0 && r == 0) | |
de19ece7 LP |
303 | r = k; |
304 | } | |
305 | } else { | |
fabe5c0e LP |
306 | _cleanup_strv_free_ char **files = NULL; |
307 | char **f; | |
c1b664d0 | 308 | |
fabe5c0e | 309 | r = conf_files_list_nulstr(&files, ".conf", NULL, conf_file_dirs); |
44143309 KS |
310 | if (r < 0) { |
311 | log_error("Failed to enumerate sysctl.d files: %s", strerror(-r)); | |
312 | goto finish; | |
313 | } | |
db1413d7 | 314 | |
fabe5c0e LP |
315 | STRV_FOREACH(f, files) { |
316 | k = parse_file(sysctl_options, *f, true); | |
317 | if (k < 0 && r == 0) | |
db1413d7 KS |
318 | r = k; |
319 | } | |
8e1bd70d | 320 | } |
86fc77c4 | 321 | |
fabe5c0e LP |
322 | k = apply_all(sysctl_options); |
323 | if (k < 0 && r == 0) | |
0187f62b LP |
324 | r = k; |
325 | ||
44143309 | 326 | finish: |
fabe5c0e | 327 | hashmap_free_free_free(sysctl_options); |
f68c5a70 LP |
328 | strv_free(arg_prefixes); |
329 | ||
c1b664d0 | 330 | return r < 0 ? EXIT_FAILURE : EXIT_SUCCESS; |
8e1bd70d | 331 | } |