337 lines
9.3 KiB
C
337 lines
9.3 KiB
C
/*-*- Mode: C; c-basic-offset: 8; indent-tabs-mode: nil -*-*/
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/***
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This file is part of systemd.
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Copyright 2010 Lennart Poettering
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systemd is free software; you can redistribute it and/or modify it
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under the terms of the GNU Lesser General Public License as published by
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the Free Software Foundation; either version 2.1 of the License, or
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(at your option) any later version.
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systemd is distributed in the hope that it will be useful, but
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WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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Lesser General Public License for more details.
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You should have received a copy of the GNU Lesser General Public License
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along with systemd; If not, see <http://www.gnu.org/licenses/>.
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***/
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#include <stdlib.h>
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#include <stdbool.h>
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#include <errno.h>
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#include <string.h>
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#include <stdio.h>
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#include <limits.h>
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#include <getopt.h>
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#include "log.h"
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#include "strv.h"
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#include "util.h"
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#include "strv.h"
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#include "hashmap.h"
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#include "path-util.h"
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#include "conf-files.h"
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#define PROC_SYS_PREFIX "/proc/sys/"
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static char **arg_prefixes;
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static Hashmap *sysctl_options;
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static int apply_sysctl(const char *property, const char *value) {
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char *p, *n;
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int r = 0, k;
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log_debug("Setting '%s' to '%s'", property, value);
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p = new(char, sizeof(PROC_SYS_PREFIX) + strlen(property));
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if (!p)
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return log_oom();
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n = stpcpy(p, PROC_SYS_PREFIX);
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strcpy(n, property);
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for (; *n; n++)
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if (*n == '.')
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*n = '/';
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if (!strv_isempty(arg_prefixes)) {
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char **i;
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bool good = false;
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STRV_FOREACH(i, arg_prefixes)
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if (path_startswith(p, *i)) {
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good = true;
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break;
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}
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if (!good) {
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log_debug("Skipping %s", p);
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free(p);
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return 0;
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}
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}
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k = write_one_line_file(p, value);
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if (k < 0) {
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log_full(k == -ENOENT ? LOG_DEBUG : LOG_WARNING,
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"Failed to write '%s' to '%s': %s", value, p, strerror(-k));
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if (k != -ENOENT && r == 0)
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r = k;
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}
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free(p);
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return r;
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}
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static int apply_all(void) {
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int r = 0;
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char *property, *value;
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Iterator i;
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HASHMAP_FOREACH_KEY(value, property, sysctl_options, i) {
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int k;
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k = apply_sysctl(property, value);
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if (k < 0 && r == 0)
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r = k;
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}
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return r;
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}
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static int parse_file(const char *path, bool ignore_enoent) {
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FILE *f;
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int r = 0;
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assert(path);
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f = fopen(path, "re");
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if (!f) {
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if (ignore_enoent && errno == ENOENT)
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return 0;
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log_error("Failed to open file '%s', ignoring: %m", path);
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return -errno;
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}
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log_debug("parse: %s\n", path);
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while (!feof(f)) {
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char l[LINE_MAX], *p, *value, *new_value, *property;
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if (!fgets(l, sizeof(l), f)) {
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if (feof(f))
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break;
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log_error("Failed to read file '%s', ignoring: %m", path);
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r = -errno;
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goto finish;
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}
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p = strstrip(l);
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if (!*p)
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continue;
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if (strchr(COMMENTS, *p))
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continue;
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value = strchr(p, '=');
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if (!value) {
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log_error("Line is not an assignment in file '%s': %s", path, value);
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if (r == 0)
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r = -EINVAL;
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continue;
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}
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*value = 0;
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value++;
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property = strdup(strstrip(p));
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if (!property) {
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r = log_oom();
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goto finish;
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}
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new_value = strdup(strstrip(value));
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if (!new_value) {
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free(property);
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r = log_oom();
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goto finish;
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}
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r = hashmap_put(sysctl_options, property, new_value);
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if (r < 0) {
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if (r == -EEXIST) {
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/* ignore this "error" to avoid returning it
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* for the function when this is the last key
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* in the file being parsed. */
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r = 0;
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log_debug("Skipping previously assigned sysctl variable %s", property);
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} else
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log_error("Failed to add sysctl variable %s to hashmap: %s", property, strerror(-r));
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free(property);
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free(new_value);
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if (r != 0)
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goto finish;
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}
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}
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finish:
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fclose(f);
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return r;
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}
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static int help(void) {
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printf("%s [OPTIONS...] [CONFIGURATION FILE...]\n\n"
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"Applies kernel sysctl settings.\n\n"
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" -h --help Show this help\n"
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" --prefix=PATH Only apply rules that apply to paths with the specified prefix\n",
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program_invocation_short_name);
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return 0;
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}
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static int parse_argv(int argc, char *argv[]) {
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enum {
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ARG_PREFIX
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};
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static const struct option options[] = {
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{ "help", no_argument, NULL, 'h' },
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{ "prefix", required_argument, NULL, ARG_PREFIX },
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{ NULL, 0, NULL, 0 }
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};
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int c;
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assert(argc >= 0);
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assert(argv);
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while ((c = getopt_long(argc, argv, "h", options, NULL)) >= 0) {
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switch (c) {
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case 'h':
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help();
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return 0;
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case ARG_PREFIX: {
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char *p;
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char **l;
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for (p = optarg; *p; p++)
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if (*p == '.')
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*p = '/';
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l = strv_append(arg_prefixes, optarg);
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if (!l)
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return log_oom();
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strv_free(arg_prefixes);
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arg_prefixes = l;
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break;
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}
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case '?':
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return -EINVAL;
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default:
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log_error("Unknown option code %c", c);
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return -EINVAL;
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}
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}
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return 1;
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}
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int main(int argc, char *argv[]) {
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int r = 0, k;
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char *property, *value;
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Iterator it;
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r = parse_argv(argc, argv);
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if (r <= 0)
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return r < 0 ? EXIT_FAILURE : EXIT_SUCCESS;
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log_set_target(LOG_TARGET_AUTO);
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log_parse_environment();
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log_open();
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umask(0022);
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sysctl_options = hashmap_new(string_hash_func, string_compare_func);
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if (!sysctl_options) {
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r = log_oom();
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goto finish;
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}
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r = 0;
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if (argc > optind) {
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int i;
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for (i = optind; i < argc; i++) {
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k = parse_file(argv[i], false);
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if (k < 0)
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r = k;
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}
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} else {
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char **files, **f;
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r = conf_files_list(&files, ".conf",
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"/etc/sysctl.d",
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"/run/sysctl.d",
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"/usr/local/lib/sysctl.d",
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"/usr/lib/sysctl.d",
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#ifdef HAVE_SPLIT_USR
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"/lib/sysctl.d",
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#endif
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NULL);
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if (r < 0) {
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log_error("Failed to enumerate sysctl.d files: %s", strerror(-r));
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goto finish;
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}
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/* We parse the files in decreasing order of precedence.
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* parse_file() will skip keys that were already assigned. */
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r = parse_file("/etc/sysctl.conf", true);
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f = files + strv_length(files) - 1;
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STRV_FOREACH_BACKWARDS(f, files) {
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k = parse_file(*f, true);
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if (k < 0)
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r = k;
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}
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strv_free(files);
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}
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k = apply_all();
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if (k < 0)
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r = k;
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finish:
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HASHMAP_FOREACH_KEY(value, property, sysctl_options, it) {
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hashmap_remove(sysctl_options, property);
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free(property);
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free(value);
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}
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hashmap_free(sysctl_options);
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strv_free(arg_prefixes);
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return r < 0 ? EXIT_FAILURE : EXIT_SUCCESS;
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}
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