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 (proc_cmdline_key_streq(key, "modules_load")) {
  66
  67                 if (proc_cmdline_value_missing(key, value))
  68                         return 0;
  69
  70                 r = add_modules(value);
  71                 if (r < 0)
  72                         return r;
  73         }
  74
  75         return 0;
  76 }
  77
  78 static int load_module(struct kmod_ctx *ctx, const char *m) {
  79         const int probe_flags = KMOD_PROBE_APPLY_BLACKLIST;
  80         struct kmod_list *itr, *modlist = NULL;
  81         int r = 0;
  82
  83         log_debug("load: %s", m);
  84
  85         r = kmod_module_new_from_lookup(ctx, m, &modlist);
  86         if (r < 0)
  87                 return log_error_errno(r, "Failed to lookup alias '%s': %m", m);
  88
  89         if (!modlist) {
  90                 log_error("Failed to find module '%s'", m);
  91                 return -ENOENT;
  92         }
  93
  94         kmod_list_foreach(itr, modlist) {
  95                 struct kmod_module *mod;
  96                 int state, err;
  97
  98                 mod = kmod_module_get_module(itr);
  99                 state = kmod_module_get_initstate(mod);
 100
 101                 switch (state) {
 102                 case KMOD_MODULE_BUILTIN:
 103                         log_info("Module '%s' is builtin", kmod_module_get_name(mod));
 104                         break;
 105
 106                 case KMOD_MODULE_LIVE:
 107                         log_debug("Module '%s' is already loaded", kmod_module_get_name(mod));
 108                         break;
 109
 110                 default:
 111                         err = kmod_module_probe_insert_module(mod, probe_flags,
 112                                                               NULL, NULL, NULL, NULL);
 113
 114                         if (err == 0)
 115                                 log_info("Inserted module '%s'", kmod_module_get_name(mod));
 116                         else if (err == KMOD_PROBE_APPLY_BLACKLIST)
 117                                 log_info("Module '%s' is blacklisted", kmod_module_get_name(mod));
 118                         else {
 119                                 log_error_errno(err, "Failed to insert '%s': %m", kmod_module_get_name(mod));
 120                                 r = err;
 121                         }
 122                 }
 123
 124                 kmod_module_unref(mod);
 125         }
 126
 127         kmod_module_unref_list(modlist);
 128
 129         return r;
 130 }
 131
 132 static int apply_file(struct kmod_ctx *ctx, const char *path, bool ignore_enoent) {
 133         _cleanup_fclose_ FILE *f = NULL;
 134         int r;
 135
 136         assert(ctx);
 137         assert(path);
 138
 139         r = search_and_fopen_nulstr(path, "re", NULL, conf_file_dirs, &f);
 140         if (r < 0) {
 141                 if (ignore_enoent && r == -ENOENT)
 142                         return 0;
 143
 144                 return log_error_errno(r, "Failed to open %s, ignoring: %m", path);
 145         }
 146
 147         log_debug("apply: %s", path);
 148         for (;;) {
 149                 char line[LINE_MAX], *l;
 150                 int k;
 151
 152                 if (!fgets(line, sizeof(line), f)) {
 153                         if (feof(f))
 154                                 break;
 155
 156                         return log_error_errno(errno, "Failed to read file '%s', ignoring: %m", path);
 157                 }
 158
 159                 l = strstrip(line);
 160                 if (!*l)
 161                         continue;
 162                 if (strchr(COMMENTS "\n", *l))
 163                         continue;
 164
 165                 k = load_module(ctx, l);
 166                 if (k < 0 && r == 0)
 167                         r = k;
 168         }
 169
 170         return r;
 171 }
 172
 173 static void help(void) {
 174         printf("%s [OPTIONS...] [CONFIGURATION FILE...]\n\n"
 175                "Loads statically configured kernel modules.\n\n"
 176                "  -h --help             Show this help\n"
 177                "     --version          Show package version\n",
 178                program_invocation_short_name);
 179 }
 180
 181 static int parse_argv(int argc, char *argv[]) {
 182
 183         enum {
 184                 ARG_VERSION = 0x100,
 185         };
 186
 187         static const struct option options[] = {
 188                 { "help",      no_argument,       NULL, 'h'           },
 189                 { "version",   no_argument,       NULL, ARG_VERSION   },
 190                 {}
 191         };
 192
 193         int c;
 194
 195         assert(argc >= 0);
 196         assert(argv);
 197
 198         while ((c = getopt_long(argc, argv, "h", options, NULL)) >= 0)
 199
 200                 switch (c) {
 201
 202                 case 'h':
 203                         help();
 204                         return 0;
 205
 206                 case ARG_VERSION:
 207                         return version();
 208
 209                 case '?':
 210                         return -EINVAL;
 211
 212                 default:
 213                         assert_not_reached("Unhandled option");
 214                 }
 215
 216         return 1;
 217 }
 218
 219 int main(int argc, char *argv[]) {
 220         int r, k;
 221         struct kmod_ctx *ctx;
 222
 223         r = parse_argv(argc, argv);
 224         if (r <= 0)
 225                 return r < 0 ? EXIT_FAILURE : EXIT_SUCCESS;
 226
 227         log_set_target(LOG_TARGET_AUTO);
 228         log_parse_environment();
 229         log_open();
 230
 231         umask(0022);
 232
 233         r = proc_cmdline_parse(parse_proc_cmdline_item, NULL, PROC_CMDLINE_STRIP_RD_PREFIX);
 234         if (r < 0)
 235                 log_warning_errno(r, "Failed to parse kernel command line, ignoring: %m");
 236
 237         ctx = kmod_new(NULL, NULL);
 238         if (!ctx) {
 239                 log_error("Failed to allocate memory for kmod.");
 240                 goto finish;
 241         }
 242
 243         kmod_load_resources(ctx);
 244         kmod_set_log_fn(ctx, systemd_kmod_log, NULL);
 245
 246         r = 0;
 247
 248         if (argc > optind) {
 249                 int i;
 250
 251                 for (i = optind; i < argc; i++) {
 252                         k = apply_file(ctx, argv[i], false);
 253                         if (k < 0 && r == 0)
 254                                 r = k;
 255                 }
 256
 257         } else {
 258                 _cleanup_strv_free_ char **files = NULL;
 259                 char **fn, **i;
 260
 261                 STRV_FOREACH(i, arg_proc_cmdline_modules) {
 262                         k = load_module(ctx, *i);
 263                         if (k < 0 && r == 0)
 264                                 r = k;
 265                 }
 266
 267                 k = conf_files_list_nulstr(&files, ".conf", NULL, conf_file_dirs);
 268                 if (k < 0) {
 269                         log_error_errno(k, "Failed to enumerate modules-load.d files: %m");
 270                         if (r == 0)
 271                                 r = k;
 272                         goto finish;
 273                 }
 274
 275                 STRV_FOREACH(fn, files) {
 276                         k = apply_file(ctx, *fn, true);
 277                         if (k < 0 && r == 0)
 278                                 r = k;
 279                 }
 280         }
 281
 282 finish:
 283         kmod_unref(ctx);
 284         strv_free(arg_proc_cmdline_modules);
 285
 286         return r < 0 ? EXIT_FAILURE : EXIT_SUCCESS;
 287 }