/*-*- 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 "strv.h" #include "hashmap.h" #include "path-util.h" #include "conf-files.h" #define PROC_SYS_PREFIX "/proc/sys/" static char **arg_prefixes; static Hashmap *sysctl_options; static int apply_sysctl(const char *property, const char *value) { char *p, *n; int r = 0, k; log_debug("Setting '%s' to '%s'", property, value); p = new(char, sizeof(PROC_SYS_PREFIX) + strlen(property)); if (!p) return log_oom(); n = stpcpy(p, PROC_SYS_PREFIX); strcpy(n, property); for (; *n; n++) if (*n == '.') *n = '/'; 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); free(p); return 0; } } k = write_one_line_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; } free(p); return r; } static int apply_all(void) { int r = 0; char *property, *value; Iterator i; 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(const char *path, bool ignore_enoent) { FILE *f; int r = 0; assert(path); f = fopen(path, "re"); if (!f) { if (ignore_enoent && errno == ENOENT) return 0; log_error("Failed to open file '%s', ignoring: %m", path); return -errno; } log_debug("parse: %s\n", path); while (!feof(f)) { char l[LINE_MAX], *p, *value, *new_value, *property; if (!fgets(l, sizeof(l), f)) { if (feof(f)) break; log_error("Failed to read file '%s', ignoring: %m", path); r = -errno; goto finish; } p = strstrip(l); if (!*p) continue; if (strchr(COMMENTS, *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++; property = strdup(strstrip(p)); if (!property) { r = log_oom(); goto finish; } new_value = strdup(strstrip(value)); if (!new_value) { free(property); r = log_oom(); goto finish; } r = hashmap_put(sysctl_options, property, new_value); if (r < 0) { if (r == -EEXIST) { /* ignore this "error" to avoid returning it * for the function when this is the last key * in the file being parsed. */ r = 0; log_debug("Skipping previously assigned sysctl variable %s", property); } else log_error("Failed to add sysctl variable %s to hashmap: %s", property, strerror(-r)); free(property); free(new_value); if (r != 0) goto finish; } } finish: fclose(f); return r; } static int help(void) { printf("%s [OPTIONS...] [CONFIGURATION FILE...]\n\n" "Applies kernel sysctl settings.\n\n" " -h --help Show this help\n" " --prefix=PATH Only apply rules that apply to paths with the specified prefix\n", program_invocation_short_name); return 0; } static int parse_argv(int argc, char *argv[]) { enum { ARG_PREFIX }; static const struct option options[] = { { "help", no_argument, NULL, 'h' }, { "prefix", required_argument, NULL, ARG_PREFIX }, { NULL, 0, NULL, 0 } }; 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_PREFIX: { char *p; char **l; for (p = optarg; *p; p++) if (*p == '.') *p = '/'; l = strv_append(arg_prefixes, optarg); if (!l) return log_oom(); strv_free(arg_prefixes); arg_prefixes = l; break; } case '?': return -EINVAL; default: log_error("Unknown option code %c", c); return -EINVAL; } } return 1; } int main(int argc, char *argv[]) { int r = 0, k; char *property, *value; Iterator it; 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_func, string_compare_func); if (!sysctl_options) { r = log_oom(); goto finish; } r = 0; if (argc > optind) { int i; for (i = optind; i < argc; i++) { k = parse_file(argv[i], false); if (k < 0) r = k; } } else { char **files, **f; r = conf_files_list(&files, ".conf", "/etc/sysctl.d", "/run/sysctl.d", "/usr/local/lib/sysctl.d", "/usr/lib/sysctl.d", #ifdef HAVE_SPLIT_USR "/lib/sysctl.d", #endif NULL); if (r < 0) { log_error("Failed to enumerate sysctl.d files: %s", strerror(-r)); goto finish; } /* We parse the files in decreasing order of precedence. * parse_file() will skip keys that were already assigned. */ r = parse_file("/etc/sysctl.conf", true); f = files + strv_length(files) - 1; STRV_FOREACH_BACKWARDS(f, files) { k = parse_file(*f, true); if (k < 0) r = k; } strv_free(files); } k = apply_all(); if (k < 0) r = k; finish: HASHMAP_FOREACH_KEY(value, property, sysctl_options, it) { hashmap_remove(sysctl_options, property); free(property); free(value); } hashmap_free(sysctl_options); strv_free(arg_prefixes); return r < 0 ? EXIT_FAILURE : EXIT_SUCCESS; }