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Diffstat (limited to 'src/grp-initprogs/systemd-sysctl/sysctl.c')
-rw-r--r--src/grp-initprogs/systemd-sysctl/sysctl.c287
1 files changed, 287 insertions, 0 deletions
diff --git a/src/grp-initprogs/systemd-sysctl/sysctl.c b/src/grp-initprogs/systemd-sysctl/sysctl.c
new file mode 100644
index 0000000000..c44aa0aabb
--- /dev/null
+++ b/src/grp-initprogs/systemd-sysctl/sysctl.c
@@ -0,0 +1,287 @@
+/***
+ This file is part of systemd.
+
+ Copyright 2010 Lennart Poettering
+
+ systemd is free software; you can redistribute it and/or modify it
+ under the terms of the GNU Lesser General Public License as published by
+ the Free Software Foundation; either version 2.1 of the License, or
+ (at your option) any later version.
+
+ systemd is distributed in the hope that it will be useful, but
+ WITHOUT ANY WARRANTY; without even the implied warranty of
+ MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
+ Lesser General Public License for more details.
+
+ You should have received a copy of the GNU Lesser General Public License
+ along with systemd; If not, see <http://www.gnu.org/licenses/>.
+***/
+
+#include <errno.h>
+#include <getopt.h>
+#include <limits.h>
+#include <stdbool.h>
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+
+#include "basic/conf-files.h"
+#include "basic/def.h"
+#include "basic/fd-util.h"
+#include "basic/fileio.h"
+#include "basic/hashmap.h"
+#include "basic/log.h"
+#include "basic/path-util.h"
+#include "basic/string-util.h"
+#include "basic/strv.h"
+#include "basic/util.h"
+#include "shared/sysctl-util.h"
+
+static char **arg_prefixes = NULL;
+
+static const char conf_file_dirs[] = CONF_PATHS_NULSTR("sysctl.d");
+
+static int apply_all(Hashmap *sysctl_options) {
+ char *property, *value;
+ Iterator i;
+ int r = 0;
+
+ HASHMAP_FOREACH_KEY(value, property, sysctl_options, i) {
+ int k;
+
+ k = sysctl_write(property, value);
+ if (k < 0) {
+ log_full_errno(k == -ENOENT ? LOG_INFO : LOG_WARNING, k,
+ "Couldn't write '%s' to '%s', ignoring: %m", value, property);
+
+ if (r == 0 && k != -ENOENT)
+ r = k;
+ }
+ }
+
+ return r;
+}
+
+static int parse_file(Hashmap *sysctl_options, const char *path, bool ignore_enoent) {
+ _cleanup_fclose_ FILE *f = NULL;
+ int r;
+
+ assert(path);
+
+ r = search_and_fopen_nulstr(path, "re", NULL, conf_file_dirs, &f);
+ if (r < 0) {
+ if (ignore_enoent && r == -ENOENT)
+ return 0;
+
+ return log_error_errno(r, "Failed to open file '%s', ignoring: %m", path);
+ }
+
+ log_debug("Parsing %s", path);
+ while (!feof(f)) {
+ char l[LINE_MAX], *p, *value, *new_value, *property, *existing;
+ void *v;
+ int k;
+
+ if (!fgets(l, sizeof(l), f)) {
+ if (feof(f))
+ break;
+
+ return log_error_errno(errno, "Failed to read file '%s', ignoring: %m", path);
+ }
+
+ p = strstrip(l);
+ if (!*p)
+ continue;
+
+ if (strchr(COMMENTS "\n", *p))
+ continue;
+
+ value = strchr(p, '=');
+ if (!value) {
+ log_error("Line is not an assignment in file '%s': %s", path, value);
+
+ if (r == 0)
+ r = -EINVAL;
+ continue;
+ }
+
+ *value = 0;
+ value++;
+
+ p = sysctl_normalize(strstrip(p));
+ value = strstrip(value);
+
+ if (!strv_isempty(arg_prefixes)) {
+ char **i, *t;
+ STRV_FOREACH(i, arg_prefixes) {
+ t = path_startswith(*i, "/proc/sys/");
+ if (t == NULL)
+ t = *i;
+ if (path_startswith(p, t))
+ goto found;
+ }
+ /* not found */
+ continue;
+ }
+
+found:
+ existing = hashmap_get2(sysctl_options, p, &v);
+ if (existing) {
+ if (streq(value, existing))
+ continue;
+
+ log_debug("Overwriting earlier assignment of %s in file '%s'.", p, path);
+ free(hashmap_remove(sysctl_options, p));
+ free(v);
+ }
+
+ property = strdup(p);
+ if (!property)
+ return log_oom();
+
+ new_value = strdup(value);
+ if (!new_value) {
+ free(property);
+ return log_oom();
+ }
+
+ k = hashmap_put(sysctl_options, property, new_value);
+ if (k < 0) {
+ log_error_errno(k, "Failed to add sysctl variable %s to hashmap: %m", property);
+ free(property);
+ free(new_value);
+ return k;
+ }
+ }
+
+ return r;
+}
+
+static void help(void) {
+ printf("%s [OPTIONS...] [CONFIGURATION FILE...]\n\n"
+ "Applies kernel sysctl settings.\n\n"
+ " -h --help Show this help\n"
+ " --version Show package version\n"
+ " --prefix=PATH Only apply rules with the specified prefix\n"
+ , program_invocation_short_name);
+}
+
+static int parse_argv(int argc, char *argv[]) {
+
+ enum {
+ ARG_VERSION = 0x100,
+ ARG_PREFIX
+ };
+
+ static const struct option options[] = {
+ { "help", no_argument, NULL, 'h' },
+ { "version", no_argument, NULL, ARG_VERSION },
+ { "prefix", required_argument, NULL, ARG_PREFIX },
+ {}
+ };
+
+ int c;
+
+ assert(argc >= 0);
+ assert(argv);
+
+ while ((c = getopt_long(argc, argv, "h", options, NULL)) >= 0)
+
+ switch (c) {
+
+ case 'h':
+ help();
+ return 0;
+
+ case ARG_VERSION:
+ return version();
+
+ case ARG_PREFIX: {
+ char *p;
+
+ /* We used to require people to specify absolute paths
+ * in /proc/sys in the past. This is kinda useless, but
+ * we need to keep compatibility. We now support any
+ * sysctl name available. */
+ sysctl_normalize(optarg);
+
+ if (startswith(optarg, "/proc/sys"))
+ p = strdup(optarg);
+ else
+ p = strappend("/proc/sys/", optarg);
+ if (!p)
+ return log_oom();
+
+ if (strv_consume(&arg_prefixes, p) < 0)
+ return log_oom();
+
+ break;
+ }
+
+ case '?':
+ return -EINVAL;
+
+ default:
+ assert_not_reached("Unhandled option");
+ }
+
+ return 1;
+}
+
+int main(int argc, char *argv[]) {
+ int r = 0, k;
+ Hashmap *sysctl_options;
+
+ r = parse_argv(argc, argv);
+ if (r <= 0)
+ return r < 0 ? EXIT_FAILURE : EXIT_SUCCESS;
+
+ log_set_target(LOG_TARGET_AUTO);
+ log_parse_environment();
+ log_open();
+
+ umask(0022);
+
+ sysctl_options = hashmap_new(&string_hash_ops);
+ if (!sysctl_options) {
+ r = log_oom();
+ goto finish;
+ }
+
+ r = 0;
+
+ if (argc > optind) {
+ int i;
+
+ for (i = optind; i < argc; i++) {
+ k = parse_file(sysctl_options, argv[i], false);
+ if (k < 0 && r == 0)
+ r = k;
+ }
+ } else {
+ _cleanup_strv_free_ char **files = NULL;
+ char **f;
+
+ r = conf_files_list_nulstr(&files, ".conf", NULL, conf_file_dirs);
+ if (r < 0) {
+ log_error_errno(r, "Failed to enumerate sysctl.d files: %m");
+ goto finish;
+ }
+
+ STRV_FOREACH(f, files) {
+ k = parse_file(sysctl_options, *f, true);
+ if (k < 0 && r == 0)
+ r = k;
+ }
+ }
+
+ k = apply_all(sysctl_options);
+ if (k < 0 && r == 0)
+ r = k;
+
+finish:
+ hashmap_free_free_free(sysctl_options);
+ strv_free(arg_prefixes);
+
+ return r < 0 ? EXIT_FAILURE : EXIT_SUCCESS;
+}
generated by cgit v1.2.3-54-g00ecf (git 2.45.2) at 2024-11-07 17:29:19 +0000