338 lines
9.4 KiB
C
338 lines
9.4 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 "hashmap.h"
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#include "path-util.h"
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#include "conf-files.h"
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#include "fileio.h"
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#include "build.h"
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static char **arg_prefixes = NULL;
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static const char conf_file_dirs[] =
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"/etc/sysctl.d\0"
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"/run/sysctl.d\0"
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"/usr/local/lib/sysctl.d\0"
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"/usr/lib/sysctl.d\0"
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#ifdef HAVE_SPLIT_USR
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"/lib/sysctl.d\0"
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#endif
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;
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static char* normalize_sysctl(char *s) {
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char *n;
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n = strpbrk(s, "/.");
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/* If the first separator is a slash, the path is
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* assumed to be normalized and slashes remain slashes
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* and dots remains dots. */
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if (!n || *n == '/')
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return s;
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/* Otherwise, dots become slashes and slashes become
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* dots. Fun. */
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while (n) {
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if (*n == '.')
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*n = '/';
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else
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*n = '.';
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n = strpbrk(n + 1, "/.");
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}
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return s;
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}
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static int apply_sysctl(const char *property, const char *value) {
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_cleanup_free_ char *p = NULL;
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char *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, strlen("/proc/sys/") + strlen(property) + 1);
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if (!p)
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return log_oom();
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n = stpcpy(p, "/proc/sys/");
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strcpy(n, property);
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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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return 0;
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}
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}
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k = write_string_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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return r;
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}
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static int apply_all(Hashmap *sysctl_options) {
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int r = 0;
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char *property, *value;
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Iterator i;
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assert(sysctl_options);
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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(Hashmap *sysctl_options, const char *path, bool ignore_enoent) {
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_cleanup_fclose_ FILE *f = NULL;
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int r;
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assert(path);
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r = search_and_fopen_nulstr(path, "re", NULL, conf_file_dirs, &f);
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if (r < 0) {
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if (ignore_enoent && r == -ENOENT)
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return 0;
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log_error("Failed to open file '%s', ignoring: %s", path, strerror(-r));
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return r;
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}
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log_debug("parse: %s", path);
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while (!feof(f)) {
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char l[LINE_MAX], *p, *value, *new_value, *property, *existing;
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void *v;
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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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return -errno;
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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 "\n", *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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p = normalize_sysctl(strstrip(p));
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value = strstrip(value);
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existing = hashmap_get2(sysctl_options, p, &v);
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if (existing) {
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if (streq(value, existing))
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continue;
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log_info("Overwriting earlier assignment of %s in file '%s'.", p, path);
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free(hashmap_remove(sysctl_options, p));
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free(v);
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}
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property = strdup(p);
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if (!property)
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return log_oom();
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new_value = strdup(value);
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if (!new_value) {
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free(property);
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return log_oom();
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}
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k = hashmap_put(sysctl_options, property, new_value);
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if (k < 0) {
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log_error("Failed to add sysctl variable %s to hashmap: %s", property, strerror(-k));
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free(property);
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free(new_value);
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return k;
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}
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}
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return r;
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}
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static void 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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" --version Show package version\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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}
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static int parse_argv(int argc, char *argv[]) {
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enum {
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ARG_VERSION = 0x100,
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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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{ "version", no_argument, NULL, ARG_VERSION },
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{ "prefix", required_argument, NULL, ARG_PREFIX },
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{}
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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_VERSION:
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puts(PACKAGE_STRING);
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puts(SYSTEMD_FEATURES);
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return 0;
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case ARG_PREFIX: {
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char *p;
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for (p = optarg; *p; p++)
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if (*p == '.')
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*p = '/';
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if (strv_extend(&arg_prefixes, optarg) < 0)
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return log_oom();
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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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assert_not_reached("Unhandled option");
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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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Hashmap *sysctl_options;
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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_ops);
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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(sysctl_options, 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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_cleanup_strv_free_ char **files = NULL;
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char **f;
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r = conf_files_list_nulstr(&files, ".conf", NULL, conf_file_dirs);
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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 = parse_file(sysctl_options, *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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}
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k = apply_all(sysctl_options);
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if (k < 0 && r == 0)
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r = k;
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finish:
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hashmap_free_free_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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