/*-*- Mode: C; c-basic-offset: 8; indent-tabs-mode: nil -*-*/
/***
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 .
***/
#include
#include
#include
#include
#include
#include
#include
#include "log.h"
#include "strv.h"
#include "util.h"
#include "hashmap.h"
#include "path-util.h"
#include "conf-files.h"
#include "fileio.h"
#include "build.h"
#include "sysctl-util.h"
static char **arg_prefixes = NULL;
static const char conf_file_dirs[] = CONF_DIRS_NULSTR("sysctl");
static int apply_all(Hashmap *sysctl_options) {
int r = 0;
char *property, *value;
Iterator i;
assert(sysctl_options);
HASHMAP_FOREACH_KEY(value, property, sysctl_options, i) {
int k;
k = sysctl_write(property, value);
if (k < 0) {
log_full(k == -ENOENT ? LOG_DEBUG : LOG_WARNING,
"Failed to write '%s' to '%s': %s", value, property, strerror(-k));
if (r == 0)
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("parse: %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;
log_error_errno(errno, "Failed to read file '%s', ignoring: %m", path);
return -errno;
}
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:
puts(PACKAGE_STRING);
puts(SYSTEMD_FEATURES);
return 0;
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;
}