src/modules-load/modules-load.c

   1 /*-*- Mode: C; c-basic-offset: 8; indent-tabs-mode: nil -*-*/
   2
   3 /***
   4   This file is part of systemd.
   5
   6   Copyright 2010 Lennart Poettering
   7
   8   systemd is free software; you can redistribute it and/or modify it
   9   under the terms of the GNU Lesser General Public License as published by
  10   the Free Software Foundation; either version 2.1 of the License, or
  11   (at your option) any later version.
  12
  13   systemd is distributed in the hope that it will be useful, but
  14   WITHOUT ANY WARRANTY; without even the implied warranty of
  15   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
  16   Lesser General Public License for more details.
  17
  18   You should have received a copy of the GNU Lesser General Public License
  19   along with systemd; If not, see <http://www.gnu.org/licenses/>.
  20 ***/
  21
  22 #include <unistd.h>
  23 #include <fcntl.h>
  24 #include <errno.h>
  25 #include <string.h>
  26 #include <sys/stat.h>
  27 #include <limits.h>
  28 #include <dirent.h>
  29 #include <getopt.h>
  30 #include <libkmod.h>
  31
  32 #include "log.h"
  33 #include "util.h"
  34 #include "strv.h"
  35 #include "conf-files.h"
  36 #include "virt.h"
  37 #include "fileio.h"
  38
  39 static char **arg_proc_cmdline_modules = NULL;
  40
  41 static const char conf_file_dirs[] =
  42         "/etc/modules-load.d\0"
  43         "/run/modules-load.d\0"
  44         "/usr/local/lib/modules-load.d\0"
  45         "/usr/lib/modules-load.d\0"
  46 #ifdef HAVE_SPLIT_USR
  47         "/lib/modules-load.d\0"
  48 #endif
  49         ;
  50
  51 #pragma GCC diagnostic push
  52 #pragma GCC diagnostic ignored "-Wformat-nonliteral"
  53 static void systemd_kmod_log(void *data, int priority, const char *file, int line,
  54                              const char *fn, const char *format, va_list args)
  55 {
  56         log_metav(priority, file, line, fn, format, args);
  57 }
  58 #pragma GCC diagnostic pop
  59
  60 static int add_modules(const char *p) {
  61         char **t;
  62         _cleanup_strv_free_ char **k = NULL;
  63
  64         k = strv_split(p, ",");
  65         if (!k)
  66                 return log_oom();
  67
  68         t = strv_merge(arg_proc_cmdline_modules, k);
  69         if (!t)
  70                 return log_oom();
  71
  72         strv_free(arg_proc_cmdline_modules);
  73         arg_proc_cmdline_modules = t;
  74
  75         return 0;
  76 }
  77
  78 static int parse_proc_cmdline(void) {
  79         char _cleanup_free_ *line = NULL;
  80         char *w, *state;
  81         int r;
  82         size_t l;
  83
  84         if (detect_container(NULL) > 0)
  85                 return 0;
  86
  87         r = read_one_line_file("/proc/cmdline", &line);
  88         if (r < 0) {
  89                 log_warning("Failed to read /proc/cmdline, ignoring: %s", strerror(-r));
  90                 return 0;
  91         }
  92
  93         FOREACH_WORD_QUOTED(w, l, line, state) {
  94                 char _cleanup_free_ *word;
  95
  96                 word = strndup(w, l);
  97                 if (!word)
  98                         return log_oom();
  99
 100                 if (startswith(word, "modules-load=")) {
 101
 102                         r = add_modules(word + 13);
 103                         if (r < 0)
 104                                 return r;
 105
 106                 } else if (startswith(word, "rd.modules-load=")) {
 107
 108                         if (in_initrd()) {
 109                                 r = add_modules(word + 16);
 110                                 if (r < 0)
 111                                         return r;
 112                         }
 113
 114                 }
 115         }
 116
 117         return 0;
 118 }
 119
 120 static int load_module(struct kmod_ctx *ctx, const char *m) {
 121         const int probe_flags = KMOD_PROBE_APPLY_BLACKLIST;
 122         struct kmod_list *itr, *modlist = NULL;
 123         int r = 0;
 124
 125         log_debug("load: %s\n", m);
 126
 127         r = kmod_module_new_from_lookup(ctx, m, &modlist);
 128         if (r < 0) {
 129                 log_error("Failed to lookup alias '%s': %s", m, strerror(-r));
 130                 return r;
 131         }
 132
 133         if (!modlist) {
 134                 log_error("Failed to find module '%s'", m);
 135                 return -ENOENT;
 136         }
 137
 138         kmod_list_foreach(itr, modlist) {
 139                 struct kmod_module *mod;
 140                 int state, err;
 141
 142                 mod = kmod_module_get_module(itr);
 143                 state = kmod_module_get_initstate(mod);
 144
 145                 switch (state) {
 146                 case KMOD_MODULE_BUILTIN:
 147                         log_info("Module '%s' is builtin", kmod_module_get_name(mod));
 148                         break;
 149
 150                 case KMOD_MODULE_LIVE:
 151                         log_debug("Module '%s' is already loaded", kmod_module_get_name(mod));
 152                         break;
 153
 154                 default:
 155                         err = kmod_module_probe_insert_module(mod, probe_flags,
 156                                                               NULL, NULL, NULL, NULL);
 157
 158                         if (err == 0)
 159                                 log_info("Inserted module '%s'", kmod_module_get_name(mod));
 160                         else if (err == KMOD_PROBE_APPLY_BLACKLIST)
 161                                 log_info("Module '%s' is blacklisted", kmod_module_get_name(mod));
 162                         else {
 163                                 log_error("Failed to insert '%s': %s", kmod_module_get_name(mod),
 164                                           strerror(-err));
 165                                 r = err;
 166                         }
 167                 }
 168
 169                 kmod_module_unref(mod);
 170         }
 171
 172         kmod_module_unref_list(modlist);
 173
 174         return r;
 175 }
 176
 177 static int apply_file(struct kmod_ctx *ctx, const char *path, bool ignore_enoent) {
 178         _cleanup_fclose_ FILE *f = NULL;
 179         int r;
 180
 181         assert(ctx);
 182         assert(path);
 183
 184         r = search_and_fopen_nulstr(path, "re", conf_file_dirs, &f);
 185         if (r < 0) {
 186                 if (ignore_enoent && r == -ENOENT)
 187                         return 0;
 188
 189                 log_error("Failed to open %s, ignoring: %s", path, strerror(-r));
 190                 return r;
 191         }
 192
 193         log_debug("apply: %s\n", path);
 194         for (;;) {
 195                 char line[LINE_MAX], *l;
 196                 int k;
 197
 198                 if (!fgets(line, sizeof(line), f)) {
 199                         if (feof(f))
 200                                 break;
 201
 202                         log_error("Failed to read file '%s', ignoring: %m", path);
 203                         return -errno;
 204                 }
 205
 206                 l = strstrip(line);
 207                 if (!*l)
 208                         continue;
 209                 if (strchr(COMMENTS "\n", *l))
 210                         continue;
 211
 212                 k = load_module(ctx, l);
 213                 if (k < 0 && r == 0)
 214                         r = k;
 215         }
 216
 217         return r;
 218 }
 219
 220 static int help(void) {
 221
 222         printf("%s [OPTIONS...] [CONFIGURATION FILE...]\n\n"
 223                "Loads statically configured kernel modules.\n\n"
 224                "  -h --help             Show this help\n",
 225                program_invocation_short_name);
 226
 227         return 0;
 228 }
 229
 230 static int parse_argv(int argc, char *argv[]) {
 231
 232         static const struct option options[] = {
 233                 { "help",      no_argument,       NULL, 'h'           },
 234                 { NULL,        0,                 NULL, 0             }
 235         };
 236
 237         int c;
 238
 239         assert(argc >= 0);
 240         assert(argv);
 241
 242         while ((c = getopt_long(argc, argv, "h", options, NULL)) >= 0) {
 243
 244                 switch (c) {
 245
 246                 case 'h':
 247                         help();
 248                         return 0;
 249
 250                 case '?':
 251                         return -EINVAL;
 252
 253                 default:
 254                         log_error("Unknown option code %c", c);
 255                         return -EINVAL;
 256                 }
 257         }
 258
 259         return 1;
 260 }
 261
 262 int main(int argc, char *argv[]) {
 263         int r, k;
 264         struct kmod_ctx *ctx;
 265
 266         r = parse_argv(argc, argv);
 267         if (r <= 0)
 268                 return r < 0 ? EXIT_FAILURE : EXIT_SUCCESS;
 269
 270         log_set_target(LOG_TARGET_AUTO);
 271         log_parse_environment();
 272         log_open();
 273
 274         umask(0022);
 275
 276         if (parse_proc_cmdline() < 0)
 277                 return EXIT_FAILURE;
 278
 279         ctx = kmod_new(NULL, NULL);
 280         if (!ctx) {
 281                 log_error("Failed to allocate memory for kmod.");
 282                 goto finish;
 283         }
 284
 285         kmod_load_resources(ctx);
 286         kmod_set_log_fn(ctx, systemd_kmod_log, NULL);
 287
 288         r = 0;
 289
 290         if (argc > optind) {
 291                 int i;
 292
 293                 for (i = optind; i < argc; i++) {
 294                         k = apply_file(ctx, argv[i], false);
 295                         if (k < 0 && r == 0)
 296                                 r = k;
 297                 }
 298
 299         } else {
 300                 _cleanup_free_ char **files = NULL;
 301                 char **fn, **i;
 302
 303                 STRV_FOREACH(i, arg_proc_cmdline_modules) {
 304                         k = load_module(ctx, *i);
 305                         if (k < 0)
 306                                 r = EXIT_FAILURE;
 307                 }
 308
 309                 r = conf_files_list_nulstr(&files, ".conf", NULL, conf_file_dirs);
 310                 if (r < 0) {
 311                         log_error("Failed to enumerate modules-load.d files: %s", strerror(-r));
 312                         goto finish;
 313                 }
 314
 315                 STRV_FOREACH(fn, files) {
 316                         k = apply_file(ctx, *fn, true);
 317                         if (k < 0 && r == 0)
 318                                 r = k;
 319                 }
 320         }
 321
 322 finish:
 323         kmod_unref(ctx);
 324         strv_free(arg_proc_cmdline_modules);
 325
 326         return r < 0 ? EXIT_FAILURE : EXIT_SUCCESS;
 327 }