601185b43d
getopt is usually good at printing out a nice error message when commandline options are invalid. It distinguishes between an unknown option and a known option with a missing arg. It is better to let it do its job and not use opterr=0 unless we actually want to suppress messages. So remove opterr=0 in the few places where it wasn't really useful. When an error in options is encountered, we should not print a lengthy help() and overwhelm the user, when we know precisely what is wrong with the commandline. In addition, since help() prints to stdout, it should not be used except when requested with -h or --help. Also, simplify things here and there.
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_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(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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