tools/modinfo.c

   1 /*
   2  * kmod-modinfo - query kernel module information using libkmod.
   3  *
   4  * Copyright (C) 2011-2013  ProFUSION embedded systems
   5  *
   6  * This program is free software: you can redistribute it and/or modify
   7  * it under the terms of the GNU General Public License as published by
   8  * the Free Software Foundation, either version 2 of the License, or
   9  * (at your option) any later version.
  10  *
  11  * This program is distributed in the hope that it will be useful,
  12  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  13  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  14  * GNU General Public License for more details.
  15  *
  16  * You should have received a copy of the GNU General Public License
  17  * along with this program.  If not, see <http://www.gnu.org/licenses/>.
  18  */
  19
  20 #include <errno.h>
  21 #include <getopt.h>
  22 #include <limits.h>
  23 #include <stdbool.h>
  24 #include <stdio.h>
  25 #include <stdlib.h>
  26 #include <string.h>
  27 #include <sys/stat.h>
  28 #include <sys/utsname.h>
  29
  30 #include <shared/util.h>
  31
  32 #include <libkmod/libkmod.h>
  33
  34 #include "kmod.h"
  35
  36 static char separator = '\n';
  37 static const char *field = NULL;
  38
  39 struct param {
  40         struct param *next;
  41         const char *name;
  42         const char *param;
  43         const char *type;
  44         int namelen;
  45         int paramlen;
  46         int typelen;
  47 };
  48
  49 static struct param *add_param(const char *name, int namelen, const char *param, int paramlen, const char *type, int typelen, struct param **list)
  50 {
  51         struct param *it;
  52
  53         for (it = *list; it != NULL; it = it->next) {
  54                 if (it->namelen == namelen &&
  55                         memcmp(it->name, name, namelen) == 0)
  56                         break;
  57         }
  58
  59         if (it == NULL) {
  60                 it = malloc(sizeof(struct param));
  61                 if (it == NULL)
  62                         return NULL;
  63                 it->next = *list;
  64                 *list = it;
  65                 it->name = name;
  66                 it->namelen = namelen;
  67                 it->param = NULL;
  68                 it->type = NULL;
  69                 it->paramlen = 0;
  70                 it->typelen = 0;
  71         }
  72
  73         if (param != NULL) {
  74                 it->param = param;
  75                 it->paramlen = paramlen;
  76         }
  77
  78         if (type != NULL) {
  79                 it->type = type;
  80                 it->typelen = typelen;
  81         }
  82
  83         return it;
  84 }
  85
  86 static int process_parm(const char *key, const char *value, struct param **params)
  87 {
  88         const char *name, *param, *type;
  89         int namelen, paramlen, typelen;
  90         struct param *it;
  91         const char *colon = strchr(value, ':');
  92         if (colon == NULL) {
  93                 ERR("Found invalid \"%s=%s\": missing ':'\n",
  94                     key, value);
  95                 return 0;
  96         }
  97
  98         name = value;
  99         namelen = colon - value;
 100         if (streq(key, "parm")) {
 101                 param = colon + 1;
 102                 paramlen = strlen(param);
 103                 type = NULL;
 104                 typelen = 0;
 105         } else {
 106                 param = NULL;
 107                 paramlen = 0;
 108                 type = colon + 1;
 109                 typelen = strlen(type);
 110         }
 111
 112         it = add_param(name, namelen, param, paramlen, type, typelen, params);
 113         if (it == NULL) {
 114                 ERR("Out of memory!\n");
 115                 return -ENOMEM;
 116         }
 117
 118         return 0;
 119 }
 120
 121 static int modinfo_params_do(const struct kmod_list *list)
 122 {
 123         const struct kmod_list *l;
 124         struct param *params = NULL;
 125         int err = 0;
 126
 127         kmod_list_foreach(l, list) {
 128                 const char *key = kmod_module_info_get_key(l);
 129                 const char *value = kmod_module_info_get_value(l);
 130                 if (!streq(key, "parm") && !streq(key, "parmtype"))
 131                         continue;
 132
 133                 err = process_parm(key, value, &params);
 134                 if (err < 0)
 135                         goto end;
 136         }
 137
 138         while (params != NULL) {
 139                 struct param *p = params;
 140                 params = p->next;
 141
 142                 if (p->param == NULL)
 143                         printf("%.*s: (%.*s)%c",
 144                                p->namelen, p->name, p->typelen, p->type,
 145                                separator);
 146                 else if (p->type != NULL)
 147                         printf("%.*s:%.*s (%.*s)%c",
 148                                p->namelen, p->name,
 149                                p->paramlen, p->param,
 150                                p->typelen, p->type,
 151                                separator);
 152                 else
 153                         printf("%.*s:%.*s%c",
 154                                p->namelen, p->name,
 155                                p->paramlen, p->param,
 156                                separator);
 157
 158                 free(p);
 159         }
 160
 161 end:
 162         while (params != NULL) {
 163                 void *tmp = params;
 164                 params = params->next;
 165                 free(tmp);
 166         }
 167
 168         return err;
 169 }
 170
 171 static int modinfo_do(struct kmod_module *mod)
 172 {
 173         struct kmod_list *l, *list = NULL;
 174         struct param *params = NULL;
 175         int err, is_builtin;
 176         const char *filename = kmod_module_get_path(mod);
 177
 178         is_builtin = (filename == NULL);
 179
 180         if (is_builtin) {
 181                 if (field == NULL)
 182                         printf("%-16s%s%c", "name:",
 183                                kmod_module_get_name(mod), separator);
 184                 else if (field != NULL && streq(field, "name"))
 185                         printf("%s%c", kmod_module_get_name(mod), separator);
 186                 filename = "(builtin)";
 187         }
 188
 189         if (field != NULL && streq(field, "filename")) {
 190                 printf("%s%c", filename, separator);
 191                 return 0;
 192         } else if (field == NULL) {
 193                 printf("%-16s%s%c", "filename:",
 194                        filename, separator);
 195         }
 196
 197         err = kmod_module_get_info(mod, &list);
 198         if (err < 0) {
 199                 if (is_builtin && err == -ENOENT) {
 200                         /*
 201                          * This is an old kernel that does not have a file
 202                          * with information about built-in modules.
 203                          */
 204                         return 0;
 205                 }
 206                 ERR("could not get modinfo from '%s': %s\n",
 207                         kmod_module_get_name(mod), strerror(-err));
 208                 return err;
 209         }
 210
 211         if (field != NULL && streq(field, "parm")) {
 212                 err = modinfo_params_do(list);
 213                 goto end;
 214         }
 215
 216         kmod_list_foreach(l, list) {
 217                 const char *key = kmod_module_info_get_key(l);
 218                 const char *value = kmod_module_info_get_value(l);
 219                 int keylen;
 220
 221                 if (field != NULL) {
 222                         if (!streq(field, key))
 223                                 continue;
 224                         /* filtered output contains no key, just value */
 225                         printf("%s%c", value, separator);
 226                         continue;
 227                 }
 228
 229                 if (streq(key, "parm") || streq(key, "parmtype")) {
 230                         err = process_parm(key, value, &params);
 231                         if (err < 0)
 232                                 goto end;
 233                         continue;
 234                 }
 235
 236                 if (separator == '\0') {
 237                         printf("%s=%s%c", key, value, separator);
 238                         continue;
 239                 }
 240
 241                 keylen = strlen(key);
 242                 printf("%s:%-*s%s%c", key, 15 - keylen, "", value, separator);
 243         }
 244
 245         if (field != NULL)
 246                 goto end;
 247
 248         while (params != NULL) {
 249                 struct param *p = params;
 250                 params = p->next;
 251
 252                 if (p->param == NULL)
 253                         printf("%-16s%.*s:%.*s%c", "parm:",
 254                                p->namelen, p->name, p->typelen, p->type,
 255                                separator);
 256                 else if (p->type != NULL)
 257                         printf("%-16s%.*s:%.*s (%.*s)%c", "parm:",
 258                                p->namelen, p->name,
 259                                p->paramlen, p->param,
 260                                p->typelen, p->type,
 261                                separator);
 262                 else
 263                         printf("%-16s%.*s:%.*s%c",
 264                                "parm:",
 265                                p->namelen, p->name,
 266                                p->paramlen, p->param,
 267                                separator);
 268
 269                 free(p);
 270         }
 271
 272 end:
 273         while (params != NULL) {
 274                 void *tmp = params;
 275                 params = params->next;
 276                 free(tmp);
 277         }
 278         kmod_module_info_free_list(list);
 279
 280         return err;
 281 }
 282
 283 static int modinfo_path_do(struct kmod_ctx *ctx, const char *path)
 284 {
 285         struct kmod_module *mod;
 286         int err = kmod_module_new_from_path(ctx, path, &mod);
 287         if (err < 0) {
 288                 ERR("Module file %s not found.\n", path);
 289                 return err;
 290         }
 291         err = modinfo_do(mod);
 292         kmod_module_unref(mod);
 293         return err;
 294 }
 295
 296 static int modinfo_alias_do(struct kmod_ctx *ctx, const char *alias)
 297 {
 298         struct kmod_list *l, *list = NULL;
 299         int err = kmod_module_new_from_lookup(ctx, alias, &list);
 300         if (err < 0) {
 301                 ERR("Module alias %s not found.\n", alias);
 302                 return err;
 303         }
 304
 305         if (list == NULL) {
 306                 ERR("Module %s not found.\n", alias);
 307                 return -ENOENT;
 308         }
 309
 310         kmod_list_foreach(l, list) {
 311                 struct kmod_module *mod = kmod_module_get_module(l);
 312                 int r = modinfo_do(mod);
 313                 kmod_module_unref(mod);
 314                 if (r < 0)
 315                         err = r;
 316         }
 317         kmod_module_unref_list(list);
 318         return err;
 319 }
 320
 321 static const char cmdopts_s[] = "adlpn0F:k:b:Vh";
 322 static const struct option cmdopts[] = {
 323         {"author", no_argument, 0, 'a'},
 324         {"description", no_argument, 0, 'd'},
 325         {"license", no_argument, 0, 'l'},
 326         {"parameters", no_argument, 0, 'p'},
 327         {"filename", no_argument, 0, 'n'},
 328         {"null", no_argument, 0, '0'},
 329         {"field", required_argument, 0, 'F'},
 330         {"set-version", required_argument, 0, 'k'},
 331         {"basedir", required_argument, 0, 'b'},
 332         {"version", no_argument, 0, 'V'},
 333         {"help", no_argument, 0, 'h'},
 334         {NULL, 0, 0, 0}
 335 };
 336
 337 static void help(void)
 338 {
 339         printf("Usage:\n"
 340                 "\t%s [options] filename [args]\n"
 341                 "Options:\n"
 342                 "\t-a, --author                Print only 'author'\n"
 343                 "\t-d, --description           Print only 'description'\n"
 344                 "\t-l, --license               Print only 'license'\n"
 345                 "\t-p, --parameters            Print only 'parm'\n"
 346                 "\t-n, --filename              Print only 'filename'\n"
 347                 "\t-0, --null                  Use \\0 instead of \\n\n"
 348                 "\t-F, --field=FIELD           Print only provided FIELD\n"
 349                 "\t-k, --set-version=VERSION   Use VERSION instead of `uname -r`\n"
 350                 "\t-b, --basedir=DIR           Use DIR as filesystem root for /lib/modules\n"
 351                 "\t-V, --version               Show version\n"
 352                 "\t-h, --help                  Show this help\n",
 353                 program_invocation_short_name);
 354 }
 355
 356 static bool is_module_filename(const char *name)
 357 {
 358         struct stat st;
 359
 360         if (stat(name, &st) == 0 && S_ISREG(st.st_mode) &&
 361                 path_ends_with_kmod_ext(name, strlen(name)))
 362                         return true;
 363
 364         return false;
 365 }
 366
 367 static int do_modinfo(int argc, char *argv[])
 368 {
 369         struct kmod_ctx *ctx;
 370         char dirname_buf[PATH_MAX];
 371         const char *dirname = NULL;
 372         const char *kversion = NULL;
 373         const char *root = NULL;
 374         const char *null_config = NULL;
 375         int i, err;
 376
 377         for (;;) {
 378                 int c, idx = 0;
 379                 c = getopt_long(argc, argv, cmdopts_s, cmdopts, &idx);
 380                 if (c == -1)
 381                         break;
 382                 switch (c) {
 383                 case 'a':
 384                         field = "author";
 385                         break;
 386                 case 'd':
 387                         field = "description";
 388                         break;
 389                 case 'l':
 390                         field = "license";
 391                         break;
 392                 case 'p':
 393                         field = "parm";
 394                         break;
 395                 case 'n':
 396                         field = "filename";
 397                         break;
 398                 case '0':
 399                         separator = '\0';
 400                         break;
 401                 case 'F':
 402                         field = optarg;
 403                         break;
 404                 case 'k':
 405                         kversion = optarg;
 406                         break;
 407                 case 'b':
 408                         root = optarg;
 409                         break;
 410                 case 'h':
 411                         help();
 412                         return EXIT_SUCCESS;
 413                 case 'V':
 414                         puts(PACKAGE " version " VERSION);
 415                         puts(KMOD_FEATURES);
 416                         return EXIT_SUCCESS;
 417                 case '?':
 418                         return EXIT_FAILURE;
 419                 default:
 420                         ERR("unexpected getopt_long() value '%c'.\n", c);
 421                         return EXIT_FAILURE;
 422                 }
 423         }
 424
 425         if (optind >= argc) {
 426                 ERR("missing module or filename.\n");
 427                 return EXIT_FAILURE;
 428         }
 429
 430         if (root != NULL || kversion != NULL) {
 431                 struct utsname u;
 432                 if (root == NULL)
 433                         root = "";
 434                 if (kversion == NULL) {
 435                         if (uname(&u) < 0) {
 436                                 ERR("uname() failed: %m\n");
 437                                 return EXIT_FAILURE;
 438                         }
 439                         kversion = u.release;
 440                 }
 441                 snprintf(dirname_buf, sizeof(dirname_buf), "%s/lib/modules/%s",
 442                          root, kversion);
 443                 dirname = dirname_buf;
 444         }
 445
 446         ctx = kmod_new(dirname, &null_config);
 447         if (!ctx) {
 448                 ERR("kmod_new() failed!\n");
 449                 return EXIT_FAILURE;
 450         }
 451
 452         err = 0;
 453         for (i = optind; i < argc; i++) {
 454                 const char *name = argv[i];
 455                 int r;
 456
 457                 if (is_module_filename(name))
 458                         r = modinfo_path_do(ctx, name);
 459                 else
 460                         r = modinfo_alias_do(ctx, name);
 461
 462                 if (r < 0)
 463                         err = r;
 464         }
 465
 466         kmod_unref(ctx);
 467         return err >= 0 ? EXIT_SUCCESS : EXIT_FAILURE;
 468 }
 469
 470 const struct kmod_cmd kmod_cmd_compat_modinfo = {
 471         .name = "modinfo",
 472         .cmd = do_modinfo,
 473         .help = "compat modinfo command",
 474 };