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/*-*- 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 General Public License as published by
the Free Software Foundation; either version 2 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
General Public License for more details.
You should have received a copy of the GNU General Public License
along with systemd; If not, see <http://www.gnu.org/licenses/>.
***/
#include <stdlib.h>
#include <stdbool.h>
#include <errno.h>
#include <string.h>
#include <stdio.h>
#include <limits.h>
#include <getopt.h>
#include "log.h"
#include "strv.h"
#include "util.h"
#include "strv.h"
#define PROC_SYS_PREFIX "/proc/sys/"
static char **arg_prefixes = NULL;
static int apply_sysctl(const char *property, const char *value) {
char *p, *n;
int r = 0, k;
log_debug("Setting '%s' to '%s'", property, value);
p = new(char, sizeof(PROC_SYS_PREFIX) + strlen(property));
if (!p) {
log_error("Out of memory");
return -ENOMEM;
}
n = stpcpy(p, PROC_SYS_PREFIX);
strcpy(n, property);
for (; *n; n++)
if (*n == '.')
*n = '/';
if (!strv_isempty(arg_prefixes)) {
char **i;
bool good = false;
STRV_FOREACH(i, arg_prefixes)
if (path_startswith(p, *i)) {
good = true;
break;
}
if (!good) {
log_debug("Skipping %s", p);
free(p);
return 0;
}
}
k = write_one_line_file(p, value);
if (k < 0) {
log_full(k == -ENOENT ? LOG_DEBUG : LOG_WARNING,
"Failed to write '%s' to '%s': %s", value, p, strerror(-k));
if (k != -ENOENT && r == 0)
r = k;
}
free(p);
return r;
}
static int apply_file(const char *path, bool ignore_enoent) {
FILE *f;
int r = 0;
assert(path);
if (!(f = fopen(path, "re"))) {
if (ignore_enoent && errno == ENOENT)
return 0;
log_error("Failed to open file '%s', ignoring: %m", path);
return -errno;
}
log_debug("apply: %s\n", path);
while (!feof(f)) {
char l[LINE_MAX], *p, *value;
int k;
if (!fgets(l, sizeof(l), f)) {
if (feof(f))
break;
log_error("Failed to read file '%s', ignoring: %m", path);
r = -errno;
goto finish;
}
p = strstrip(l);
if (!*p)
continue;
if (strchr(COMMENTS, *p))
continue;
if (!(value = strchr(p, '='))) {
log_error("Line is not an assignment in file '%s': %s", path, value);
if (r == 0)
r = -EINVAL;
continue;
}
*value = 0;
value++;
if ((k = apply_sysctl(strstrip(p), strstrip(value))) < 0 && r == 0)
r = k;
}
finish:
fclose(f);
return r;
}
static int help(void) {
printf("%s [OPTIONS...] [CONFIGURATION FILE...]\n\n"
"Applies kernel sysctl settings.\n\n"
" -h --help Show this help\n"
" --prefix=PATH Only apply rules that apply to paths with the specified prefix\n",
program_invocation_short_name);
return 0;
}
static int parse_argv(int argc, char *argv[]) {
enum {
ARG_PREFIX
};
static const struct option options[] = {
{ "help", no_argument, NULL, 'h' },
{ "prefix", required_argument, NULL, ARG_PREFIX },
{ NULL, 0, NULL, 0 }
};
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_PREFIX: {
char *p;
char **l;
for (p = optarg; *p; p++)
if (*p == '.')
*p = '/';
l = strv_append(arg_prefixes, optarg);
if (!l) {
log_error("Out of memory");
return -ENOMEM;
}
strv_free(arg_prefixes);
arg_prefixes = l;
break;
}
case '?':
return -EINVAL;
default:
log_error("Unknown option code %c", c);
return -EINVAL;
}
}
return 1;
}
int main(int argc, char *argv[]) {
int r = 0;
r = parse_argv(argc, argv);
if (r <= 0)
return r < 0 ? EXIT_FAILURE : EXIT_SUCCESS;
if (argc-optind > 1) {
log_error("This program expects one or no arguments.");
return EXIT_FAILURE;
}
log_set_target(LOG_TARGET_AUTO);
log_parse_environment();
log_open();
umask(0022);
if (argc > optind)
r = apply_file(argv[optind], false);
else {
char **files, **f;
r = conf_files_list(&files, ".conf",
"/etc/sysctl.d",
"/run/sysctl.d",
"/usr/local/lib/sysctl.d",
"/usr/lib/sysctl.d",
"/lib/sysctl.d",
NULL);
if (r < 0) {
log_error("Failed to enumerate sysctl.d files: %s", strerror(-r));
goto finish;
}
STRV_FOREACH(f, files) {
int k;
k = apply_file(*f, true);
if (k < 0 && r == 0)
r = k;
}
apply_file("/etc/sysctl.conf", true);
strv_free(files);
}
finish:
strv_free(arg_prefixes);
return r < 0 ? EXIT_FAILURE : EXIT_SUCCESS;
}
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