| /*-*- Mode: C; c-basic-offset: 8; indent-tabs-mode: nil -*-*/ |
| |
| /*** |
| 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 <stdlib.h> |
| #include <stdbool.h> |
| #include <errno.h> |
| #include <string.h> |
| #include <stdio.h> |
| #include <limits.h> |
| #include <getopt.h> |
| |
| #include "log.h" |
| #include "strv.h" |
| #include "util.h" |
| #include "hashmap.h" |
| #include "path-util.h" |
| #include "conf-files.h" |
| #include "fileio.h" |
| #include "build.h" |
| |
| static char **arg_prefixes = NULL; |
| |
| static const char conf_file_dirs[] = |
| "/etc/sysctl.d\0" |
| "/run/sysctl.d\0" |
| "/usr/local/lib/sysctl.d\0" |
| "/usr/lib/sysctl.d\0" |
| #ifdef HAVE_SPLIT_USR |
| "/lib/sysctl.d\0" |
| #endif |
| ; |
| |
| static char* normalize_sysctl(char *s) { |
| char *n; |
| |
| n = strpbrk(s, "/."); |
| /* If the first separator is a slash, the path is |
| * assumed to be normalized and slashes remain slashes |
| * and dots remains dots. */ |
| if (!n || *n == '/') |
| return s; |
| |
| /* Otherwise, dots become slashes and slashes become |
| * dots. Fun. */ |
| while (n) { |
| if (*n == '.') |
| *n = '/'; |
| else |
| *n = '.'; |
| |
| n = strpbrk(n + 1, "/."); |
| } |
| |
| return s; |
| } |
| |
| static int apply_sysctl(const char *property, const char *value) { |
| _cleanup_free_ char *p = NULL; |
| char *n; |
| int r = 0, k; |
| |
| log_debug("Setting '%s' to '%s'", property, value); |
| |
| p = new(char, strlen("/proc/sys/") + strlen(property) + 1); |
| if (!p) |
| return log_oom(); |
| |
| n = stpcpy(p, "/proc/sys/"); |
| strcpy(n, property); |
| |
| if (!strv_isempty(arg_prefixes)) { |
| char **i; |
| bool good = false; |
| |
| STRV_FOREACH(i, arg_prefixes) |
| if (path_startswith(p, *i)) { |
| good = true; |
| break; |
| } |
| |
| if (!good) { |
| log_debug("Skipping %s", p); |
| return 0; |
| } |
| } |
| |
| k = write_string_file(p, value); |
| if (k < 0) { |
| log_full(k == -ENOENT ? LOG_DEBUG : LOG_WARNING, |
| "Failed to write '%s' to '%s': %s", value, p, strerror(-k)); |
| |
| if (k != -ENOENT && r == 0) |
| r = k; |
| } |
| |
| return r; |
| } |
| |
| static int apply_all(Hashmap *sysctl_options) { |
| int r = 0; |
| char *property, *value; |
| Iterator i; |
| |
| assert(sysctl_options); |
| |
| HASHMAP_FOREACH_KEY(value, property, sysctl_options, i) { |
| int k; |
| |
| k = apply_sysctl(property, value); |
| if (k < 0 && r == 0) |
| 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; |
| |
| log_error("Failed to open file '%s', ignoring: %s", path, strerror(-r)); |
| return r; |
| } |
| |
| log_debug("parse: %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; |
| |
| log_error("Failed to read file '%s', ignoring: %m", path); |
| return -errno; |
| } |
| |
| 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 = normalize_sysctl(strstrip(p)); |
| value = strstrip(value); |
| |
| existing = hashmap_get2(sysctl_options, p, &v); |
| if (existing) { |
| if (streq(value, existing)) |
| continue; |
| |
| log_info("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("Failed to add sysctl variable %s to hashmap: %s", property, strerror(-k)); |
| 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: |
| puts(PACKAGE_STRING); |
| puts(SYSTEMD_FEATURES); |
| return 0; |
| |
| 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. */ |
| normalize_sysctl(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("Failed to enumerate sysctl.d files: %s", strerror(-r)); |
| 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; |
| } |