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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" |
f68c5a70 | 33 | #include "strv.h" |
86fc77c4 | 34 | #include "hashmap.h" |
9eb977db | 35 | #include "path-util.h" |
2c21044f | 36 | #include "conf-files.h" |
8e1bd70d LP |
37 | |
38 | #define PROC_SYS_PREFIX "/proc/sys/" | |
39 | ||
86fc77c4 MS |
40 | static char **arg_prefixes; |
41 | static Hashmap *sysctl_options; | |
7a2a0b90 | 42 | |
c1b664d0 | 43 | static int apply_sysctl(const char *property, const char *value) { |
8e1bd70d | 44 | char *p, *n; |
c1b664d0 | 45 | int r = 0, k; |
8e1bd70d LP |
46 | |
47 | log_debug("Setting '%s' to '%s'", property, value); | |
48 | ||
7a2a0b90 | 49 | p = new(char, sizeof(PROC_SYS_PREFIX) + strlen(property)); |
0d0f0c50 SL |
50 | if (!p) |
51 | return log_oom(); | |
8e1bd70d LP |
52 | |
53 | n = stpcpy(p, PROC_SYS_PREFIX); | |
54 | strcpy(n, property); | |
55 | ||
56 | for (; *n; n++) | |
57 | if (*n == '.') | |
58 | *n = '/'; | |
59 | ||
f68c5a70 LP |
60 | if (!strv_isempty(arg_prefixes)) { |
61 | char **i; | |
62 | bool good = false; | |
63 | ||
64 | STRV_FOREACH(i, arg_prefixes) | |
65 | if (path_startswith(p, *i)) { | |
66 | good = true; | |
67 | break; | |
68 | } | |
69 | ||
70 | if (!good) { | |
71 | log_debug("Skipping %s", p); | |
72 | free(p); | |
73 | return 0; | |
74 | } | |
7a2a0b90 LP |
75 | } |
76 | ||
77 | k = write_one_line_file(p, value); | |
78 | if (k < 0) { | |
5707631e | 79 | |
c1b664d0 LP |
80 | log_full(k == -ENOENT ? LOG_DEBUG : LOG_WARNING, |
81 | "Failed to write '%s' to '%s': %s", value, p, strerror(-k)); | |
24a35973 | 82 | |
c1b664d0 LP |
83 | if (k != -ENOENT && r == 0) |
84 | r = k; | |
8e1bd70d LP |
85 | } |
86 | ||
87 | free(p); | |
c1b664d0 LP |
88 | |
89 | return r; | |
8e1bd70d LP |
90 | } |
91 | ||
86fc77c4 MS |
92 | static int apply_all(void) { |
93 | int r = 0; | |
94 | char *property, *value; | |
95 | Iterator i; | |
96 | ||
97 | HASHMAP_FOREACH_KEY(value, property, sysctl_options, i) { | |
98 | int k; | |
99 | ||
100 | k = apply_sysctl(property, value); | |
101 | if (k < 0 && r == 0) | |
102 | r = k; | |
103 | } | |
104 | return r; | |
105 | } | |
106 | ||
107 | static int parse_file(const char *path, bool ignore_enoent) { | |
8e1bd70d | 108 | FILE *f; |
c1b664d0 | 109 | int r = 0; |
8e1bd70d LP |
110 | |
111 | assert(path); | |
112 | ||
86fc77c4 MS |
113 | f = fopen(path, "re"); |
114 | if (!f) { | |
c1b664d0 LP |
115 | if (ignore_enoent && errno == ENOENT) |
116 | return 0; | |
117 | ||
8e1bd70d | 118 | log_error("Failed to open file '%s', ignoring: %m", path); |
c1b664d0 | 119 | return -errno; |
8e1bd70d LP |
120 | } |
121 | ||
86fc77c4 | 122 | log_debug("parse: %s\n", path); |
8e1bd70d | 123 | while (!feof(f)) { |
86fc77c4 | 124 | char l[LINE_MAX], *p, *value, *new_value, *property; |
8e1bd70d LP |
125 | |
126 | if (!fgets(l, sizeof(l), f)) { | |
127 | if (feof(f)) | |
128 | break; | |
129 | ||
130 | log_error("Failed to read file '%s', ignoring: %m", path); | |
c1b664d0 | 131 | r = -errno; |
8e1bd70d LP |
132 | goto finish; |
133 | } | |
134 | ||
135 | p = strstrip(l); | |
136 | ||
137 | if (!*p) | |
138 | continue; | |
139 | ||
140 | if (strchr(COMMENTS, *p)) | |
141 | continue; | |
142 | ||
86fc77c4 MS |
143 | value = strchr(p, '='); |
144 | if (!value) { | |
8e1bd70d | 145 | log_error("Line is not an assignment in file '%s': %s", path, value); |
c1b664d0 LP |
146 | |
147 | if (r == 0) | |
148 | r = -EINVAL; | |
8e1bd70d LP |
149 | continue; |
150 | } | |
151 | ||
152 | *value = 0; | |
153 | value++; | |
154 | ||
86fc77c4 MS |
155 | property = strdup(strstrip(p)); |
156 | if (!property) { | |
157 | r = log_oom(); | |
158 | goto finish; | |
159 | } | |
160 | ||
161 | new_value = strdup(strstrip(value)); | |
162 | if (!new_value) { | |
163 | free(property); | |
164 | r = log_oom(); | |
165 | goto finish; | |
166 | } | |
167 | ||
168 | r = hashmap_put(sysctl_options, property, new_value); | |
169 | if (r < 0) { | |
170 | if (r == -EEXIST) | |
171 | log_debug("Skipping previously assigned sysctl variable %s", property); | |
172 | else | |
173 | log_error("Failed to add sysctl variable %s to hashmap: %s", property, strerror(-r)); | |
174 | ||
175 | free(property); | |
176 | free(new_value); | |
177 | if (r != -EEXIST) | |
178 | goto finish; | |
179 | } | |
8e1bd70d LP |
180 | } |
181 | ||
182 | finish: | |
183 | fclose(f); | |
c1b664d0 LP |
184 | |
185 | return r; | |
8e1bd70d LP |
186 | } |
187 | ||
7a2a0b90 LP |
188 | static int help(void) { |
189 | ||
190 | printf("%s [OPTIONS...] [CONFIGURATION FILE...]\n\n" | |
191 | "Applies kernel sysctl settings.\n\n" | |
192 | " -h --help Show this help\n" | |
193 | " --prefix=PATH Only apply rules that apply to paths with the specified prefix\n", | |
194 | program_invocation_short_name); | |
195 | ||
196 | return 0; | |
197 | } | |
198 | ||
199 | static int parse_argv(int argc, char *argv[]) { | |
200 | ||
201 | enum { | |
202 | ARG_PREFIX | |
203 | }; | |
204 | ||
205 | static const struct option options[] = { | |
206 | { "help", no_argument, NULL, 'h' }, | |
207 | { "prefix", required_argument, NULL, ARG_PREFIX }, | |
208 | { NULL, 0, NULL, 0 } | |
209 | }; | |
210 | ||
211 | int c; | |
212 | ||
213 | assert(argc >= 0); | |
214 | assert(argv); | |
215 | ||
216 | while ((c = getopt_long(argc, argv, "h", options, NULL)) >= 0) { | |
217 | ||
218 | switch (c) { | |
219 | ||
220 | case 'h': | |
221 | help(); | |
222 | return 0; | |
223 | ||
224 | case ARG_PREFIX: { | |
225 | char *p; | |
f68c5a70 | 226 | char **l; |
7a2a0b90 LP |
227 | |
228 | for (p = optarg; *p; p++) | |
229 | if (*p == '.') | |
230 | *p = '/'; | |
231 | ||
f68c5a70 | 232 | l = strv_append(arg_prefixes, optarg); |
0d0f0c50 SL |
233 | if (!l) |
234 | return log_oom(); | |
f68c5a70 LP |
235 | |
236 | strv_free(arg_prefixes); | |
237 | arg_prefixes = l; | |
7a2a0b90 LP |
238 | |
239 | break; | |
240 | } | |
241 | ||
242 | case '?': | |
243 | return -EINVAL; | |
244 | ||
245 | default: | |
246 | log_error("Unknown option code %c", c); | |
247 | return -EINVAL; | |
248 | } | |
249 | } | |
250 | ||
251 | return 1; | |
252 | } | |
253 | ||
8e1bd70d | 254 | int main(int argc, char *argv[]) { |
c1b664d0 | 255 | int r = 0; |
86fc77c4 MS |
256 | char *property, *value; |
257 | Iterator it; | |
8e1bd70d | 258 | |
7a2a0b90 LP |
259 | r = parse_argv(argc, argv); |
260 | if (r <= 0) | |
261 | return r < 0 ? EXIT_FAILURE : EXIT_SUCCESS; | |
262 | ||
8e1bd70d LP |
263 | log_set_target(LOG_TARGET_AUTO); |
264 | log_parse_environment(); | |
265 | log_open(); | |
266 | ||
4c12626c LP |
267 | umask(0022); |
268 | ||
86fc77c4 MS |
269 | sysctl_options = hashmap_new(string_hash_func, string_compare_func); |
270 | if (!sysctl_options) { | |
271 | r = log_oom(); | |
272 | goto finish; | |
273 | } | |
274 | ||
de19ece7 LP |
275 | if (argc > optind) { |
276 | int i; | |
277 | ||
278 | for (i = optind; i < argc; i++) { | |
279 | int k; | |
280 | ||
86fc77c4 | 281 | k = parse_file(argv[i], false); |
de19ece7 LP |
282 | if (k < 0 && r == 0) |
283 | r = k; | |
284 | } | |
285 | } else { | |
db1413d7 | 286 | char **files, **f; |
de19ece7 | 287 | int k; |
c1b664d0 | 288 | |
44143309 | 289 | r = conf_files_list(&files, ".conf", |
44143309 | 290 | "/etc/sysctl.d", |
fc1a2e06 | 291 | "/run/sysctl.d", |
40013ebc | 292 | "/usr/local/lib/sysctl.d", |
44143309 | 293 | "/usr/lib/sysctl.d", |
de19ece7 | 294 | #ifdef HAVE_SPLIT_USR |
223a3558 | 295 | "/lib/sysctl.d", |
de19ece7 | 296 | #endif |
44143309 KS |
297 | NULL); |
298 | if (r < 0) { | |
299 | log_error("Failed to enumerate sysctl.d files: %s", strerror(-r)); | |
300 | goto finish; | |
301 | } | |
db1413d7 | 302 | |
86fc77c4 MS |
303 | /* We parse the files in decreasing order of precedence. |
304 | * parse_file() will skip keys that were already assigned. */ | |
305 | ||
306 | r = parse_file("/etc/sysctl.conf", true); | |
307 | ||
308 | f = files + strv_length(files) - 1; | |
309 | STRV_FOREACH_BACKWARDS(f, files) { | |
310 | k = parse_file(*f, true); | |
db1413d7 KS |
311 | if (k < 0 && r == 0) |
312 | r = k; | |
313 | } | |
314 | ||
315 | strv_free(files); | |
8e1bd70d | 316 | } |
86fc77c4 MS |
317 | |
318 | r = apply_all(); | |
44143309 | 319 | finish: |
86fc77c4 MS |
320 | HASHMAP_FOREACH_KEY(value, property, sysctl_options, it) { |
321 | hashmap_remove(sysctl_options, property); | |
322 | free(property); | |
323 | free(value); | |
324 | } | |
325 | hashmap_free(sysctl_options); | |
326 | ||
f68c5a70 LP |
327 | strv_free(arg_prefixes); |
328 | ||
c1b664d0 | 329 | return r < 0 ? EXIT_FAILURE : EXIT_SUCCESS; |
8e1bd70d | 330 | } |