1 /*-*- Mode: C; c-basic-offset: 8; indent-tabs-mode: nil -*-*/
4 This file is part of systemd.
6 Copyright 2010 Lennart Poettering
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.
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.
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/>.
34 #include "path-util.h"
35 #include "conf-files.h"
39 static char **arg_prefixes = NULL;
41 static const char conf_file_dirs[] = CONF_DIRS_NULSTR("sysctl");
43 static char* normalize_sysctl(char *s) {
47 /* If the first separator is a slash, the path is
48 * assumed to be normalized and slashes remain slashes
49 * and dots remains dots. */
53 /* Otherwise, dots become slashes and slashes become
61 n = strpbrk(n + 1, "/.");
67 static int apply_sysctl(const char *property, const char *value) {
68 _cleanup_free_ char *p = NULL;
72 log_debug("Setting '%s' to '%s'", property, value);
74 p = new(char, strlen("/proc/sys/") + strlen(property) + 1);
78 n = stpcpy(p, "/proc/sys/");
81 if (!strv_isempty(arg_prefixes)) {
85 STRV_FOREACH(i, arg_prefixes)
86 if (path_startswith(p, *i)) {
92 log_debug("Skipping %s", p);
97 k = write_string_file(p, value);
99 log_full(k == -ENOENT ? LOG_DEBUG : LOG_WARNING,
100 "Failed to write '%s' to '%s': %s", value, p, strerror(-k));
102 if (k != -ENOENT && r == 0)
109 static int apply_all(Hashmap *sysctl_options) {
111 char *property, *value;
114 assert(sysctl_options);
116 HASHMAP_FOREACH_KEY(value, property, sysctl_options, i) {
119 k = apply_sysctl(property, value);
126 static int parse_file(Hashmap *sysctl_options, const char *path, bool ignore_enoent) {
127 _cleanup_fclose_ FILE *f = NULL;
132 r = search_and_fopen_nulstr(path, "re", NULL, conf_file_dirs, &f);
134 if (ignore_enoent && r == -ENOENT)
137 log_error_errno(-r, "Failed to open file '%s', ignoring: %m", path);
141 log_debug("parse: %s", path);
143 char l[LINE_MAX], *p, *value, *new_value, *property, *existing;
147 if (!fgets(l, sizeof(l), f)) {
151 log_error("Failed to read file '%s', ignoring: %m", path);
159 if (strchr(COMMENTS "\n", *p))
162 value = strchr(p, '=');
164 log_error("Line is not an assignment in file '%s': %s", path, value);
174 p = normalize_sysctl(strstrip(p));
175 value = strstrip(value);
177 existing = hashmap_get2(sysctl_options, p, &v);
179 if (streq(value, existing))
182 log_info("Overwriting earlier assignment of %s in file '%s'.", p, path);
183 free(hashmap_remove(sysctl_options, p));
187 property = strdup(p);
191 new_value = strdup(value);
197 k = hashmap_put(sysctl_options, property, new_value);
199 log_error_errno(-k, "Failed to add sysctl variable %s to hashmap: %m", property);
209 static void help(void) {
210 printf("%s [OPTIONS...] [CONFIGURATION FILE...]\n\n"
211 "Applies kernel sysctl settings.\n\n"
212 " -h --help Show this help\n"
213 " --version Show package version\n"
214 " --prefix=PATH Only apply rules with the specified prefix\n"
215 , program_invocation_short_name);
218 static int parse_argv(int argc, char *argv[]) {
225 static const struct option options[] = {
226 { "help", no_argument, NULL, 'h' },
227 { "version", no_argument, NULL, ARG_VERSION },
228 { "prefix", required_argument, NULL, ARG_PREFIX },
237 while ((c = getopt_long(argc, argv, "h", options, NULL)) >= 0)
246 puts(PACKAGE_STRING);
247 puts(SYSTEMD_FEATURES);
253 /* We used to require people to specify absolute paths
254 * in /proc/sys in the past. This is kinda useless, but
255 * we need to keep compatibility. We now support any
256 * sysctl name available. */
257 normalize_sysctl(optarg);
258 if (startswith(optarg, "/proc/sys"))
261 p = strappend("/proc/sys/", optarg);
265 if (strv_consume(&arg_prefixes, p) < 0)
275 assert_not_reached("Unhandled option");
281 int main(int argc, char *argv[]) {
283 Hashmap *sysctl_options;
285 r = parse_argv(argc, argv);
287 return r < 0 ? EXIT_FAILURE : EXIT_SUCCESS;
289 log_set_target(LOG_TARGET_AUTO);
290 log_parse_environment();
295 sysctl_options = hashmap_new(&string_hash_ops);
296 if (!sysctl_options) {
306 for (i = optind; i < argc; i++) {
307 k = parse_file(sysctl_options, argv[i], false);
312 _cleanup_strv_free_ char **files = NULL;
315 r = conf_files_list_nulstr(&files, ".conf", NULL, conf_file_dirs);
317 log_error_errno(-r, "Failed to enumerate sysctl.d files: %m");
321 STRV_FOREACH(f, files) {
322 k = parse_file(sysctl_options, *f, true);
328 k = apply_all(sysctl_options);
333 hashmap_free_free_free(sysctl_options);
334 strv_free(arg_prefixes);
336 return r < 0 ? EXIT_FAILURE : EXIT_SUCCESS;