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/>.
35 #include "path-util.h"
36 #include "conf-files.h"
38 static char **arg_prefixes = NULL;
40 static const char conf_file_dirs[] =
43 "/usr/local/lib/sysctl.d\0"
50 static char *normalize_sysctl(char *s) {
60 static int apply_sysctl(const char *property, const char *value) {
61 _cleanup_free_ char *p = NULL;
65 log_debug("Setting '%s' to '%s'", property, value);
67 p = new(char, sizeof("/proc/sys/") + strlen(property));
71 n = stpcpy(p, "/proc/sys/");
74 if (!strv_isempty(arg_prefixes)) {
78 STRV_FOREACH(i, arg_prefixes)
79 if (path_startswith(p, *i)) {
85 log_debug("Skipping %s", p);
90 k = write_one_line_file(p, value);
92 log_full(k == -ENOENT ? LOG_DEBUG : LOG_WARNING,
93 "Failed to write '%s' to '%s': %s", value, p, strerror(-k));
95 if (k != -ENOENT && r == 0)
102 static int apply_all(Hashmap *sysctl_options) {
104 char *property, *value;
107 assert(sysctl_options);
109 HASHMAP_FOREACH_KEY(value, property, sysctl_options, i) {
112 k = apply_sysctl(property, value);
119 static int parse_file(Hashmap *sysctl_options, const char *path, bool ignore_enoent) {
120 _cleanup_fclose_ FILE *f = NULL;
125 r = search_and_fopen_nulstr(path, "re", conf_file_dirs, &f);
127 if (ignore_enoent && errno == -ENOENT)
130 log_error("Failed to open file '%s', ignoring: %s", path, strerror(-r));
134 log_debug("parse: %s\n", path);
136 char l[LINE_MAX], *p, *value, *new_value, *property, *existing;
139 if (!fgets(l, sizeof(l), f)) {
143 log_error("Failed to read file '%s', ignoring: %m", path);
151 if (strchr(COMMENTS, *p))
154 value = strchr(p, '=');
156 log_error("Line is not an assignment in file '%s': %s", path, value);
166 p = normalize_sysctl(strstrip(p));
167 value = strstrip(value);
169 existing = hashmap_get(sysctl_options, p);
171 if (!streq(value, existing))
172 log_warning("Two ore more conflicting assignments of %s, ignoring.", property);
177 property = strdup(p);
181 new_value = strdup(value);
187 k = hashmap_put(sysctl_options, property, new_value);
189 log_error("Failed to add sysctl variable %s to hashmap: %s", property, strerror(-r));
199 static int help(void) {
201 printf("%s [OPTIONS...] [CONFIGURATION FILE...]\n\n"
202 "Applies kernel sysctl settings.\n\n"
203 " -h --help Show this help\n"
204 " --prefix=PATH Only apply rules that apply to paths with the specified prefix\n",
205 program_invocation_short_name);
210 static int parse_argv(int argc, char *argv[]) {
216 static const struct option options[] = {
217 { "help", no_argument, NULL, 'h' },
218 { "prefix", required_argument, NULL, ARG_PREFIX },
227 while ((c = getopt_long(argc, argv, "h", options, NULL)) >= 0) {
239 for (p = optarg; *p; p++)
243 l = strv_append(arg_prefixes, optarg);
247 strv_free(arg_prefixes);
257 log_error("Unknown option code %c", c);
265 int main(int argc, char *argv[]) {
267 Hashmap *sysctl_options;
269 r = parse_argv(argc, argv);
271 return r < 0 ? EXIT_FAILURE : EXIT_SUCCESS;
273 log_set_target(LOG_TARGET_AUTO);
274 log_parse_environment();
279 sysctl_options = hashmap_new(string_hash_func, string_compare_func);
280 if (!sysctl_options) {
290 for (i = optind; i < argc; i++) {
291 k = parse_file(sysctl_options, argv[i], false);
296 _cleanup_strv_free_ char **files = NULL;
299 r = conf_files_list_nulstr(&files, ".conf", NULL, conf_file_dirs);
301 log_error("Failed to enumerate sysctl.d files: %s", strerror(-r));
305 r = parse_file(sysctl_options, "/etc/sysctl.conf", true);
307 STRV_FOREACH(f, files) {
308 k = parse_file(sysctl_options, *f, true);
314 k = apply_all(sysctl_options);
319 hashmap_free_free_free(sysctl_options);
320 strv_free(arg_prefixes);
322 return r < 0 ? EXIT_FAILURE : EXIT_SUCCESS;