/*** 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 Lesser General Public License as published by the Free Software Foundation; either version 2.1 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 Lesser General Public License for more details. You should have received a copy of the GNU Lesser General Public License along with systemd; If not, see <http://www.gnu.org/licenses/>. ***/ #include <errno.h> #include <getopt.h> #include <limits.h> #include <stdbool.h> #include <stdio.h> #include <stdlib.h> #include <string.h> #include "conf-files.h" #include "def.h" #include "fd-util.h" #include "fileio.h" #include "hashmap.h" #include "log.h" #include "path-util.h" #include "string-util.h" #include "strv.h" #include "sysctl-util.h" #include "util.h" static char **arg_prefixes = NULL; static const char conf_file_dirs[] = CONF_PATHS_NULSTR("sysctl.d"); static int apply_all(Hashmap *sysctl_options) { char *property, *value; Iterator i; int r = 0; HASHMAP_FOREACH_KEY(value, property, sysctl_options, i) { int k; k = sysctl_write(property, value); if (k < 0) { log_full_errno(k == -ENOENT ? LOG_INFO : LOG_WARNING, k, "Couldn't write '%s' to '%s', ignoring: %m", value, property); if (r == 0 && k != -ENOENT) r = k; } } return r; } static int parse_file(Hashmap *sysctl_options, const char *path, bool ignore_enoent) { _cleanup_fclose_ FILE *f = NULL; int r; assert(path); r = search_and_fopen_nulstr(path, "re", NULL, conf_file_dirs, &f); if (r < 0) { if (ignore_enoent && r == -ENOENT) return 0; return log_error_errno(r, "Failed to open file '%s', ignoring: %m", path); } log_debug("Parsing %s", path); while (!feof(f)) { char l[LINE_MAX], *p, *value, *new_value, *property, *existing; void *v; int k; if (!fgets(l, sizeof(l), f)) { if (feof(f)) break; return log_error_errno(errno, "Failed to read file '%s', ignoring: %m", path); } p = strstrip(l); if (!*p) continue; if (strchr(COMMENTS "\n", *p)) continue; value = strchr(p, '='); if (!value) { log_error("Line is not an assignment in file '%s': %s", path, value); if (r == 0) r = -EINVAL; continue; } *value = 0; value++; p = sysctl_normalize(strstrip(p)); value = strstrip(value); if (!strv_isempty(arg_prefixes)) { char **i, *t; STRV_FOREACH(i, arg_prefixes) { t = path_startswith(*i, "/proc/sys/"); if (t == NULL) t = *i; if (path_startswith(p, t)) goto found; } /* not found */ continue; } found: existing = hashmap_get2(sysctl_options, p, &v); if (existing) { if (streq(value, existing)) continue; log_debug("Overwriting earlier assignment of %s in file '%s'.", p, path); free(hashmap_remove(sysctl_options, p)); free(v); } property = strdup(p); if (!property) return log_oom(); new_value = strdup(value); if (!new_value) { free(property); return log_oom(); } k = hashmap_put(sysctl_options, property, new_value); if (k < 0) { log_error_errno(k, "Failed to add sysctl variable %s to hashmap: %m", property); free(property); free(new_value); return k; } } return r; } static void help(void) { printf("%s [OPTIONS...] [CONFIGURATION FILE...]\n\n" "Applies kernel sysctl settings.\n\n" " -h --help Show this help\n" " --version Show package version\n" " --prefix=PATH Only apply rules with the specified prefix\n" , program_invocation_short_name); } static int parse_argv(int argc, char *argv[]) { enum { ARG_VERSION = 0x100, ARG_PREFIX }; static const struct option options[] = { { "help", no_argument, NULL, 'h' }, { "version", no_argument, NULL, ARG_VERSION }, { "prefix", required_argument, NULL, ARG_PREFIX }, {} }; 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_VERSION: return version(); case ARG_PREFIX: { char *p; /* We used to require people to specify absolute paths * in /proc/sys in the past. This is kinda useless, but * we need to keep compatibility. We now support any * sysctl name available. */ sysctl_normalize(optarg); if (startswith(optarg, "/proc/sys")) p = strdup(optarg); else p = strappend("/proc/sys/", optarg); if (!p) return log_oom(); if (strv_consume(&arg_prefixes, p) < 0) return log_oom(); break; } case '?': return -EINVAL; default: assert_not_reached("Unhandled option"); } return 1; } int main(int argc, char *argv[]) { int r = 0, k; Hashmap *sysctl_options; r = parse_argv(argc, argv); if (r <= 0) return r < 0 ? EXIT_FAILURE : EXIT_SUCCESS; log_set_target(LOG_TARGET_AUTO); log_parse_environment(); log_open(); umask(0022); sysctl_options = hashmap_new(&string_hash_ops); if (!sysctl_options) { r = log_oom(); goto finish; } r = 0; if (argc > optind) { int i; for (i = optind; i < argc; i++) { k = parse_file(sysctl_options, argv[i], false); if (k < 0 && r == 0) r = k; } } else { _cleanup_strv_free_ char **files = NULL; char **f; r = conf_files_list_nulstr(&files, ".conf", NULL, conf_file_dirs); if (r < 0) { log_error_errno(r, "Failed to enumerate sysctl.d files: %m"); goto finish; } STRV_FOREACH(f, files) { k = parse_file(sysctl_options, *f, true); if (k < 0 && r == 0) r = k; } } k = apply_all(sysctl_options); if (k < 0 && r == 0) r = k; finish: hashmap_free_free_free(sysctl_options); strv_free(arg_prefixes); return r < 0 ? EXIT_FAILURE : EXIT_SUCCESS; }