diff options
Diffstat (limited to 'src/sysctl.c')
| -rw-r--r-- | src/sysctl.c | 272 |
1 files changed, 272 insertions, 0 deletions
diff --git a/src/sysctl.c b/src/sysctl.c new file mode 100644 index 0000000000..17c6719841 --- /dev/null +++ b/src/sysctl.c @@ -0,0 +1,272 @@ +/*-*- 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 General Public License as published by + the Free Software Foundation; either version 2 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 + General Public License for more details. + + You should have received a copy of the GNU 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" + +#define PROC_SYS_PREFIX "/proc/sys/" + +static char **arg_prefixes = NULL; + +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) { + log_error("Out of memory"); + return -ENOMEM; + } + + 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_file(const char *path, bool ignore_enoent) { + FILE *f; + int r = 0; + + assert(path); + + if (!(f = fopen(path, "re"))) { + if (ignore_enoent && errno == ENOENT) + return 0; + + log_error("Failed to open file '%s', ignoring: %m", path); + return -errno; + } + + log_debug("apply: %s\n", path); + while (!feof(f)) { + char l[LINE_MAX], *p, *value; + int k; + + 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; + + if (!(value = strchr(p, '='))) { + log_error("Line is not an assignment in file '%s': %s", path, value); + + if (r == 0) + r = -EINVAL; + continue; + } + + *value = 0; + value++; + + if ((k = apply_sysctl(strstrip(p), strstrip(value))) < 0 && r == 0) + r = k; + } + +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) { + log_error("Out of memory"); + return -ENOMEM; + } + + 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; + + 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); + + if (argc > optind) { + int i; + + for (i = optind; i < argc; i++) { + int k; + + k = apply_file(argv[i], false); + if (k < 0 && r == 0) + r = k; + } + } else { + char **files, **f; + int k; + + 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; + } + + STRV_FOREACH(f, files) { + k = apply_file(*f, true); + if (k < 0 && r == 0) + r = k; + } + + k = apply_file("/etc/sysctl.conf", true); + if (k < 0 && r == 0) + r = k; + + strv_free(files); + } +finish: + strv_free(arg_prefixes); + + return r < 0 ? EXIT_FAILURE : EXIT_SUCCESS; +} |