5430f7f2bc
We finally got the OK from all contributors with non-trivial commits to relicense systemd from GPL2+ to LGPL2.1+. Some udev bits continue to be GPL2+ for now, but we are looking into relicensing them too, to allow free copy/paste of all code within systemd. The bits that used to be MIT continue to be MIT. The big benefit of the relicensing is that closed source code may now link against libsystemd-login.so and friends.
273 lines
7.3 KiB
C
273 lines
7.3 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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#define PROC_SYS_PREFIX "/proc/sys/"
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static char **arg_prefixes = NULL;
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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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log_error("Out of memory");
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return -ENOMEM;
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}
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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_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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if (!(f = fopen(path, "re"))) {
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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("apply: %s\n", path);
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while (!feof(f)) {
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char l[LINE_MAX], *p, *value;
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int k;
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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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if (!(value = strchr(p, '='))) {
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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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if ((k = apply_sysctl(strstrip(p), strstrip(value))) < 0 && r == 0)
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r = k;
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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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log_error("Out of memory");
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return -ENOMEM;
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}
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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;
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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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if (argc > optind) {
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int i;
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for (i = optind; i < argc; i++) {
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int k;
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k = apply_file(argv[i], false);
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if (k < 0 && r == 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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int k;
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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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STRV_FOREACH(f, files) {
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k = apply_file(*f, true);
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if (k < 0 && r == 0)
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r = k;
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}
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k = apply_file("/etc/sysctl.conf", true);
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if (k < 0 && r == 0)
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r = k;
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strv_free(files);
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}
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finish:
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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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