src/modules-load/modules-load.c

   1 /***
   2   This file is part of systemd.
   3
   4   Copyright 2010 Lennart Poettering
   5
   6   systemd is free software; you can redistribute it and/or modify it
   7   under the terms of the GNU Lesser General Public License as published by
   8   the Free Software Foundation; either version 2.1 of the License, or
   9   (at your option) any later version.
  10
  11   systemd is distributed in the hope that it will be useful, but
  12   WITHOUT ANY WARRANTY; without even the implied warranty of
  13   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
  14   Lesser General Public License for more details.
  15
  16   You should have received a copy of the GNU Lesser General Public License
  17   along with systemd; If not, see <http://www.gnu.org/licenses/>.
  18 ***/
  19
  20 #include <errno.h>
  21 #include <getopt.h>
  22 #include <libkmod.h>
  23 #include <limits.h>
  24 #include <string.h>
  25 #include <sys/stat.h>
  26
  27 #include "conf-files.h"
  28 #include "def.h"
  29 #include "fd-util.h"
  30 #include "fileio.h"
  31 #include "log.h"
  32 #include "proc-cmdline.h"
  33 #include "string-util.h"
  34 #include "strv.h"
  35 #include "util.h"
  36
  37 static char **arg_proc_cmdline_modules = NULL;
  38
  39 static const char conf_file_dirs[] = CONF_PATHS_NULSTR("modules-load.d");
  40
  41 static void systemd_kmod_log(void *data, int priority, const char *file, int line,
  42                              const char *fn, const char *format, va_list args) {
  43
  44         DISABLE_WARNING_FORMAT_NONLITERAL;
  45         log_internalv(priority, 0, file, line, fn, format, args);
  46         REENABLE_WARNING;
  47 }
  48
  49 static int add_modules(const char *p) {
  50         _cleanup_strv_free_ char **k = NULL;
  51
  52         k = strv_split(p, ",");
  53         if (!k)
  54                 return log_oom();
  55
  56         if (strv_extend_strv(&arg_proc_cmdline_modules, k, true) < 0)
  57                 return log_oom();
  58
  59         return 0;
  60 }
  61
  62 static int parse_proc_cmdline_item(const char *key, const char *value, void *data) {
  63         int r;
  64
  65         if (streq(key, "modules-load") && value) {
  66                 r = add_modules(value);
  67                 if (r < 0)
  68                         return r;
  69         }
  70
  71         return 0;
  72 }
  73
  74 static int load_module(struct kmod_ctx *ctx, const char *m) {
  75         const int probe_flags = KMOD_PROBE_APPLY_BLACKLIST;
  76         struct kmod_list *itr, *modlist = NULL;
  77         int r = 0;
  78
  79         log_debug("load: %s", m);
  80
  81         r = kmod_module_new_from_lookup(ctx, m, &modlist);
  82         if (r < 0)
  83                 return log_error_errno(r, "Failed to lookup alias '%s': %m", m);
  84
  85         if (!modlist) {
  86                 log_error("Failed to find module '%s'", m);
  87                 return -ENOENT;
  88         }
  89
  90         kmod_list_foreach(itr, modlist) {
  91                 struct kmod_module *mod;
  92                 int state, err;
  93
  94                 mod = kmod_module_get_module(itr);
  95                 state = kmod_module_get_initstate(mod);
  96
  97                 switch (state) {
  98                 case KMOD_MODULE_BUILTIN:
  99                         log_info("Module '%s' is builtin", kmod_module_get_name(mod));
 100                         break;
 101
 102                 case KMOD_MODULE_LIVE:
 103                         log_debug("Module '%s' is already loaded", kmod_module_get_name(mod));
 104                         break;
 105
 106                 default:
 107                         err = kmod_module_probe_insert_module(mod, probe_flags,
 108                                                               NULL, NULL, NULL, NULL);
 109
 110                         if (err == 0)
 111                                 log_info("Inserted module '%s'", kmod_module_get_name(mod));
 112                         else if (err == KMOD_PROBE_APPLY_BLACKLIST)
 113                                 log_info("Module '%s' is blacklisted", kmod_module_get_name(mod));
 114                         else {
 115                                 log_error_errno(err, "Failed to insert '%s': %m", kmod_module_get_name(mod));
 116                                 r = err;
 117                         }
 118                 }
 119
 120                 kmod_module_unref(mod);
 121         }
 122
 123         kmod_module_unref_list(modlist);
 124
 125         return r;
 126 }
 127
 128 static int apply_file(struct kmod_ctx *ctx, const char *path, bool ignore_enoent) {
 129         _cleanup_fclose_ FILE *f = NULL;
 130         int r;
 131
 132         assert(ctx);
 133         assert(path);
 134
 135         r = search_and_fopen_nulstr(path, "re", NULL, conf_file_dirs, &f);
 136         if (r < 0) {
 137                 if (ignore_enoent && r == -ENOENT)
 138                         return 0;
 139
 140                 return log_error_errno(r, "Failed to open %s, ignoring: %m", path);
 141         }
 142
 143         log_debug("apply: %s", path);
 144         for (;;) {
 145                 char line[LINE_MAX], *l;
 146                 int k;
 147
 148                 if (!fgets(line, sizeof(line), f)) {
 149                         if (feof(f))
 150                                 break;
 151
 152                         return log_error_errno(errno, "Failed to read file '%s', ignoring: %m", path);
 153                 }
 154
 155                 l = strstrip(line);
 156                 if (!*l)
 157                         continue;
 158                 if (strchr(COMMENTS "\n", *l))
 159                         continue;
 160
 161                 k = load_module(ctx, l);
 162                 if (k < 0 && r == 0)
 163                         r = k;
 164         }
 165
 166         return r;
 167 }
 168
 169 static void help(void) {
 170         printf("%s [OPTIONS...] [CONFIGURATION FILE...]\n\n"
 171                "Loads statically configured kernel modules.\n\n"
 172                "  -h --help             Show this help\n"
 173                "     --version          Show package version\n",
 174                program_invocation_short_name);
 175 }
 176
 177 static int parse_argv(int argc, char *argv[]) {
 178
 179         enum {
 180                 ARG_VERSION = 0x100,
 181         };
 182
 183         static const struct option options[] = {
 184                 { "help",      no_argument,       NULL, 'h'           },
 185                 { "version",   no_argument,       NULL, ARG_VERSION   },
 186                 {}
 187         };
 188
 189         int c;
 190
 191         assert(argc >= 0);
 192         assert(argv);
 193
 194         while ((c = getopt_long(argc, argv, "h", options, NULL)) >= 0)
 195
 196                 switch (c) {
 197
 198                 case 'h':
 199                         help();
 200                         return 0;
 201
 202                 case ARG_VERSION:
 203                         return version();
 204
 205                 case '?':
 206                         return -EINVAL;
 207
 208                 default:
 209                         assert_not_reached("Unhandled option");
 210                 }
 211
 212         return 1;
 213 }
 214
 215 int main(int argc, char *argv[]) {
 216         int r, k;
 217         struct kmod_ctx *ctx;
 218
 219         r = parse_argv(argc, argv);
 220         if (r <= 0)
 221                 return r < 0 ? EXIT_FAILURE : EXIT_SUCCESS;
 222
 223         log_set_target(LOG_TARGET_AUTO);
 224         log_parse_environment();
 225         log_open();
 226
 227         umask(0022);
 228
 229         r = parse_proc_cmdline(parse_proc_cmdline_item, NULL, true);
 230         if (r < 0)
 231                 log_warning_errno(r, "Failed to parse kernel command line, ignoring: %m");
 232
 233         ctx = kmod_new(NULL, NULL);
 234         if (!ctx) {
 235                 log_error("Failed to allocate memory for kmod.");
 236                 goto finish;
 237         }
 238
 239         kmod_load_resources(ctx);
 240         kmod_set_log_fn(ctx, systemd_kmod_log, NULL);
 241
 242         r = 0;
 243
 244         if (argc > optind) {
 245                 int i;
 246
 247                 for (i = optind; i < argc; i++) {
 248                         k = apply_file(ctx, argv[i], false);
 249                         if (k < 0 && r == 0)
 250                                 r = k;
 251                 }
 252
 253         } else {
 254                 _cleanup_strv_free_ char **files = NULL;
 255                 char **fn, **i;
 256
 257                 STRV_FOREACH(i, arg_proc_cmdline_modules) {
 258                         k = load_module(ctx, *i);
 259                         if (k < 0 && r == 0)
 260                                 r = k;
 261                 }
 262
 263                 k = conf_files_list_nulstr(&files, ".conf", NULL, conf_file_dirs);
 264                 if (k < 0) {
 265                         log_error_errno(k, "Failed to enumerate modules-load.d files: %m");
 266                         if (r == 0)
 267                                 r = k;
 268                         goto finish;
 269                 }
 270
 271                 STRV_FOREACH(fn, files) {
 272                         k = apply_file(ctx, *fn, true);
 273                         if (k < 0 && r == 0)
 274                                 r = k;
 275                 }
 276         }
 277
 278 finish:
 279         kmod_unref(ctx);
 280         strv_free(arg_proc_cmdline_modules);
 281
 282         return r < 0 ? EXIT_FAILURE : EXIT_SUCCESS;
 283 }