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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 | ||
2e573fcf | 51 | static char* normalize_sysctl(char *s) { |
fabe5c0e LP |
52 | char *n; |
53 | ||
2e573fcf ZJS |
54 | n = strpbrk(s, "/."); |
55 | /* If the first separator is a slash, the path is | |
56 | * assumed to be normalized and slashes remain slashes | |
57 | * and dots remains dots. */ | |
58 | if (!n || *n == '/') | |
59 | return s; | |
60 | ||
61 | /* Otherwise, dots become slashes and slashes become | |
62 | * dots. Fun. */ | |
63 | while (n) { | |
fabe5c0e LP |
64 | if (*n == '.') |
65 | *n = '/'; | |
2e573fcf ZJS |
66 | else |
67 | *n = '.'; | |
68 | ||
69 | n = strpbrk(n + 1, "/."); | |
70 | } | |
fabe5c0e LP |
71 | |
72 | return s; | |
73 | } | |
7a2a0b90 | 74 | |
c1b664d0 | 75 | static int apply_sysctl(const char *property, const char *value) { |
fabe5c0e LP |
76 | _cleanup_free_ char *p = NULL; |
77 | char *n; | |
c1b664d0 | 78 | int r = 0, k; |
8e1bd70d LP |
79 | |
80 | log_debug("Setting '%s' to '%s'", property, value); | |
81 | ||
f8294e41 | 82 | p = new(char, strlen("/proc/sys/") + strlen(property) + 1); |
0d0f0c50 SL |
83 | if (!p) |
84 | return log_oom(); | |
8e1bd70d | 85 | |
fabe5c0e | 86 | n = stpcpy(p, "/proc/sys/"); |
8e1bd70d LP |
87 | strcpy(n, property); |
88 | ||
f68c5a70 LP |
89 | if (!strv_isempty(arg_prefixes)) { |
90 | char **i; | |
91 | bool good = false; | |
92 | ||
93 | STRV_FOREACH(i, arg_prefixes) | |
94 | if (path_startswith(p, *i)) { | |
95 | good = true; | |
96 | break; | |
97 | } | |
98 | ||
99 | if (!good) { | |
100 | log_debug("Skipping %s", p); | |
f68c5a70 LP |
101 | return 0; |
102 | } | |
7a2a0b90 LP |
103 | } |
104 | ||
574d5f2d | 105 | k = write_string_file(p, value); |
7a2a0b90 | 106 | if (k < 0) { |
c1b664d0 LP |
107 | log_full(k == -ENOENT ? LOG_DEBUG : LOG_WARNING, |
108 | "Failed to write '%s' to '%s': %s", value, p, strerror(-k)); | |
24a35973 | 109 | |
c1b664d0 LP |
110 | if (k != -ENOENT && r == 0) |
111 | r = k; | |
8e1bd70d LP |
112 | } |
113 | ||
c1b664d0 | 114 | return r; |
8e1bd70d LP |
115 | } |
116 | ||
fabe5c0e | 117 | static int apply_all(Hashmap *sysctl_options) { |
86fc77c4 MS |
118 | int r = 0; |
119 | char *property, *value; | |
120 | Iterator i; | |
121 | ||
fabe5c0e LP |
122 | assert(sysctl_options); |
123 | ||
86fc77c4 MS |
124 | HASHMAP_FOREACH_KEY(value, property, sysctl_options, i) { |
125 | int k; | |
126 | ||
127 | k = apply_sysctl(property, value); | |
128 | if (k < 0 && r == 0) | |
129 | r = k; | |
130 | } | |
131 | return r; | |
132 | } | |
133 | ||
fabe5c0e LP |
134 | static int parse_file(Hashmap *sysctl_options, const char *path, bool ignore_enoent) { |
135 | _cleanup_fclose_ FILE *f = NULL; | |
136 | int r; | |
8e1bd70d LP |
137 | |
138 | assert(path); | |
139 | ||
4cf7ea55 | 140 | r = search_and_fopen_nulstr(path, "re", NULL, conf_file_dirs, &f); |
fabe5c0e | 141 | if (r < 0) { |
6f6fad96 | 142 | if (ignore_enoent && r == -ENOENT) |
c1b664d0 LP |
143 | return 0; |
144 | ||
fabe5c0e LP |
145 | log_error("Failed to open file '%s', ignoring: %s", path, strerror(-r)); |
146 | return r; | |
8e1bd70d LP |
147 | } |
148 | ||
9f6445e3 | 149 | log_debug("parse: %s", path); |
8e1bd70d | 150 | while (!feof(f)) { |
fabe5c0e | 151 | char l[LINE_MAX], *p, *value, *new_value, *property, *existing; |
04bf3c1a | 152 | void *v; |
fabe5c0e | 153 | int k; |
8e1bd70d LP |
154 | |
155 | if (!fgets(l, sizeof(l), f)) { | |
156 | if (feof(f)) | |
157 | break; | |
158 | ||
159 | log_error("Failed to read file '%s', ignoring: %m", path); | |
fabe5c0e | 160 | return -errno; |
8e1bd70d LP |
161 | } |
162 | ||
163 | p = strstrip(l); | |
8e1bd70d LP |
164 | if (!*p) |
165 | continue; | |
166 | ||
d3b6d0c2 | 167 | if (strchr(COMMENTS "\n", *p)) |
8e1bd70d LP |
168 | continue; |
169 | ||
86fc77c4 MS |
170 | value = strchr(p, '='); |
171 | if (!value) { | |
8e1bd70d | 172 | log_error("Line is not an assignment in file '%s': %s", path, value); |
c1b664d0 LP |
173 | |
174 | if (r == 0) | |
175 | r = -EINVAL; | |
8e1bd70d LP |
176 | continue; |
177 | } | |
178 | ||
179 | *value = 0; | |
180 | value++; | |
181 | ||
fabe5c0e LP |
182 | p = normalize_sysctl(strstrip(p)); |
183 | value = strstrip(value); | |
184 | ||
04bf3c1a | 185 | existing = hashmap_get2(sysctl_options, p, &v); |
fabe5c0e | 186 | if (existing) { |
04bf3c1a KS |
187 | if (streq(value, existing)) |
188 | continue; | |
fabe5c0e | 189 | |
04bf3c1a KS |
190 | log_info("Overwriting earlier assignment of %s in file '%s'.", p, path); |
191 | free(hashmap_remove(sysctl_options, p)); | |
192 | free(v); | |
86fc77c4 MS |
193 | } |
194 | ||
fabe5c0e LP |
195 | property = strdup(p); |
196 | if (!property) | |
197 | return log_oom(); | |
198 | ||
199 | new_value = strdup(value); | |
86fc77c4 MS |
200 | if (!new_value) { |
201 | free(property); | |
fabe5c0e | 202 | return log_oom(); |
86fc77c4 MS |
203 | } |
204 | ||
fabe5c0e LP |
205 | k = hashmap_put(sysctl_options, property, new_value); |
206 | if (k < 0) { | |
04bf3c1a | 207 | log_error("Failed to add sysctl variable %s to hashmap: %s", property, strerror(-k)); |
86fc77c4 MS |
208 | free(property); |
209 | free(new_value); | |
fabe5c0e | 210 | return k; |
86fc77c4 | 211 | } |
8e1bd70d LP |
212 | } |
213 | ||
c1b664d0 | 214 | return r; |
8e1bd70d LP |
215 | } |
216 | ||
601185b4 | 217 | static void help(void) { |
7a2a0b90 LP |
218 | printf("%s [OPTIONS...] [CONFIGURATION FILE...]\n\n" |
219 | "Applies kernel sysctl settings.\n\n" | |
220 | " -h --help Show this help\n" | |
eb9da376 | 221 | " --version Show package version\n" |
601185b4 ZJS |
222 | " --prefix=PATH Only apply rules that apply to paths with the specified prefix\n" |
223 | , program_invocation_short_name); | |
7a2a0b90 LP |
224 | } |
225 | ||
226 | static int parse_argv(int argc, char *argv[]) { | |
227 | ||
228 | enum { | |
eb9da376 | 229 | ARG_VERSION = 0x100, |
7a2a0b90 LP |
230 | ARG_PREFIX |
231 | }; | |
232 | ||
233 | static const struct option options[] = { | |
234 | { "help", no_argument, NULL, 'h' }, | |
eb9da376 | 235 | { "version", no_argument, NULL, ARG_VERSION }, |
7a2a0b90 | 236 | { "prefix", required_argument, NULL, ARG_PREFIX }, |
eb9da376 | 237 | {} |
7a2a0b90 LP |
238 | }; |
239 | ||
240 | int c; | |
241 | ||
242 | assert(argc >= 0); | |
243 | assert(argv); | |
244 | ||
601185b4 | 245 | while ((c = getopt_long(argc, argv, "h", options, NULL)) >= 0) |
7a2a0b90 LP |
246 | |
247 | switch (c) { | |
248 | ||
249 | case 'h': | |
601185b4 ZJS |
250 | help(); |
251 | return 0; | |
eb9da376 LP |
252 | |
253 | case ARG_VERSION: | |
254 | puts(PACKAGE_STRING); | |
255 | puts(SYSTEMD_FEATURES); | |
7a2a0b90 LP |
256 | return 0; |
257 | ||
258 | case ARG_PREFIX: { | |
259 | char *p; | |
260 | ||
261 | for (p = optarg; *p; p++) | |
262 | if (*p == '.') | |
263 | *p = '/'; | |
264 | ||
e3e45d4f | 265 | if (strv_extend(&arg_prefixes, optarg) < 0) |
0d0f0c50 | 266 | return log_oom(); |
f68c5a70 | 267 | |
7a2a0b90 LP |
268 | break; |
269 | } | |
270 | ||
271 | case '?': | |
272 | return -EINVAL; | |
273 | ||
274 | default: | |
eb9da376 | 275 | assert_not_reached("Unhandled option"); |
7a2a0b90 | 276 | } |
7a2a0b90 LP |
277 | |
278 | return 1; | |
279 | } | |
280 | ||
8e1bd70d | 281 | int main(int argc, char *argv[]) { |
0187f62b | 282 | int r = 0, k; |
fabe5c0e | 283 | Hashmap *sysctl_options; |
8e1bd70d | 284 | |
7a2a0b90 LP |
285 | r = parse_argv(argc, argv); |
286 | if (r <= 0) | |
287 | return r < 0 ? EXIT_FAILURE : EXIT_SUCCESS; | |
288 | ||
8e1bd70d LP |
289 | log_set_target(LOG_TARGET_AUTO); |
290 | log_parse_environment(); | |
291 | log_open(); | |
292 | ||
4c12626c LP |
293 | umask(0022); |
294 | ||
d5099efc | 295 | sysctl_options = hashmap_new(&string_hash_ops); |
86fc77c4 MS |
296 | if (!sysctl_options) { |
297 | r = log_oom(); | |
298 | goto finish; | |
299 | } | |
300 | ||
0187f62b LP |
301 | r = 0; |
302 | ||
de19ece7 LP |
303 | if (argc > optind) { |
304 | int i; | |
305 | ||
306 | for (i = optind; i < argc; i++) { | |
fabe5c0e LP |
307 | k = parse_file(sysctl_options, argv[i], false); |
308 | if (k < 0 && r == 0) | |
de19ece7 LP |
309 | r = k; |
310 | } | |
311 | } else { | |
fabe5c0e LP |
312 | _cleanup_strv_free_ char **files = NULL; |
313 | char **f; | |
c1b664d0 | 314 | |
fabe5c0e | 315 | r = conf_files_list_nulstr(&files, ".conf", NULL, conf_file_dirs); |
44143309 KS |
316 | if (r < 0) { |
317 | log_error("Failed to enumerate sysctl.d files: %s", strerror(-r)); | |
318 | goto finish; | |
319 | } | |
db1413d7 | 320 | |
fabe5c0e LP |
321 | STRV_FOREACH(f, files) { |
322 | k = parse_file(sysctl_options, *f, true); | |
323 | if (k < 0 && r == 0) | |
db1413d7 KS |
324 | r = k; |
325 | } | |
8e1bd70d | 326 | } |
86fc77c4 | 327 | |
fabe5c0e LP |
328 | k = apply_all(sysctl_options); |
329 | if (k < 0 && r == 0) | |
0187f62b LP |
330 | r = k; |
331 | ||
44143309 | 332 | finish: |
fabe5c0e | 333 | hashmap_free_free_free(sysctl_options); |
f68c5a70 LP |
334 | strv_free(arg_prefixes); |
335 | ||
c1b664d0 | 336 | return r < 0 ? EXIT_FAILURE : EXIT_SUCCESS; |
8e1bd70d | 337 | } |