udevinfo.c

   1 /*
   2  * udevinfo - fetches attributes for a device
   3  *
   4  * Copyright (C) 2004 Kay Sievers <kay.sievers@vrfy.org>
   5  *
   6  *
   7  *      This program is free software; you can redistribute it and/or modify it
   8  *      under the terms of the GNU General Public License as published by the
   9  *      Free Software Foundation version 2 of the License.
  10  *
  11  *      This program 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  *      General Public License for more details.
  15  *
  16  *      You should have received a copy of the GNU General Public License along
  17  *      with this program; if not, write to the Free Software Foundation, Inc.,
  18  *      675 Mass Ave, Cambridge, MA 02139, USA.
  19  *
  20  */
  21
  22 #include <stdlib.h>
  23 #include <string.h>
  24 #include <stdio.h>
  25 #include <ctype.h>
  26 #include <stdarg.h>
  27 #include <unistd.h>
  28 #include <errno.h>
  29
  30 #include "udev.h"
  31 #include "udev_version.h"
  32 #include "logging.h"
  33 #include "udevdb.h"
  34 #include "libsysfs/libsysfs.h"
  35
  36
  37 # define SYSFS_VALUE_MAX 200
  38
  39 char **main_argv;
  40 int main_argc;
  41 unsigned char logname[42];
  42
  43 static int print_all_attributes(const char *path)
  44 {
  45         struct dlist *attributes;
  46         struct sysfs_attribute *attr;
  47         struct sysfs_directory *sysfs_dir;
  48         char value[SYSFS_VALUE_MAX];
  49         int len;
  50         int retval = 0;
  51
  52         sysfs_dir = sysfs_open_directory(path);
  53         if (sysfs_dir == NULL)
  54                 return -1;
  55
  56         attributes = sysfs_get_dir_attributes(sysfs_dir);
  57         if (attributes == NULL) {
  58                 retval = -1;
  59                 goto exit;
  60         }
  61
  62         dlist_for_each_data(attributes, attr, struct sysfs_attribute) {
  63                 if (attr->value != NULL) {
  64                         strncpy(value, attr->value, SYSFS_VALUE_MAX);
  65                         len = strlen(value);
  66                         if (len == 0)
  67                                 continue;
  68
  69                         /* remove trailing newline */
  70                         if (value[len-1] == '\n') {
  71                                 value[len-1] = '\0';
  72                                 len--;
  73                         }
  74
  75                         /* skip nonprintable values */
  76                         while (len) {
  77                                 if (isprint(value[len-1]) == 0)
  78                                         break;
  79                                 len--;
  80                         }
  81                         if (len == 0)
  82                                 printf("    SYSFS_%s=\"%s\"\n", attr->name, value);
  83                 }
  84         }
  85         printf("\n");
  86
  87 exit:
  88         sysfs_close_directory(sysfs_dir);
  89
  90         return retval;
  91 }
  92
  93 /* callback for database dump */
  94 static int print_record(char *path, struct udevice *dev)
  95 {
  96         printf("P: %s\n", path);
  97         printf("N: %s\n", dev->name);
  98         printf("M: %#o\n", dev->mode);
  99         printf("S: %s\n", dev->symlink);
 100         printf("O: %s\n", dev->owner);
 101         printf("G: %s\n", dev->group);
 102         printf("\n");
 103         return 0;
 104 }
 105
 106 enum query_type {
 107         NONE,
 108         NAME,
 109         PATH,
 110         SYMLINK,
 111         MODE,
 112         OWNER,
 113         GROUP
 114 };
 115
 116 static int print_device_chain(const char *path)
 117 {
 118         struct sysfs_class_device *class_dev;
 119         struct sysfs_class_device *class_dev_parent;
 120         struct sysfs_attribute *attr;
 121         struct sysfs_device *sysfs_dev;
 122         struct sysfs_device *sysfs_dev_parent;
 123         int retval = 0;
 124
 125         /*  get the class dev */
 126         class_dev = sysfs_open_class_device_path(path);
 127         if (class_dev == NULL) {
 128                 printf("couldn't get the class device\n");
 129                 return -1;
 130         }
 131
 132         /* read the 'dev' file for major/minor*/
 133         attr = sysfs_get_classdev_attr(class_dev, "dev");
 134         if (attr == NULL) {
 135                 printf("couldn't get the \"dev\" file\n");
 136                 retval = -1;
 137                 goto exit;
 138         }
 139         printf("\ndevice '%s' has major:minor %s", class_dev->path, attr->value);
 140         sysfs_close_attribute(attr);
 141
 142         /* open sysfs class device directory and print all attributes */
 143         printf("  looking at class device '%s':\n", class_dev->path);
 144         if (print_all_attributes(class_dev->path) != 0) {
 145                 printf("couldn't open class device directory\n");
 146                 retval = -1;
 147                 goto exit;
 148         }
 149
 150         /* get the device link (if parent exists look here) */
 151         class_dev_parent = sysfs_get_classdev_parent(class_dev);
 152         if (class_dev_parent != NULL) {
 153                 //sysfs_close_class_device(class_dev);
 154                 class_dev = class_dev_parent;
 155         }
 156         sysfs_dev = sysfs_get_classdev_device(class_dev);
 157         if (sysfs_dev != NULL)
 158                 printf("follow the class device's \"device\"\n");
 159
 160         /* look the device chain upwards */
 161         while (sysfs_dev != NULL) {
 162                 printf("  looking at the device chain at '%s':\n", sysfs_dev->path);
 163                 printf("    BUS=\"%s\"\n", sysfs_dev->bus);
 164                 printf("    ID=\"%s\"\n", sysfs_dev->bus_id);
 165
 166                 /* open sysfs device directory and print all attributes */
 167                 print_all_attributes(sysfs_dev->path);
 168
 169                 sysfs_dev_parent = sysfs_get_device_parent(sysfs_dev);
 170                 if (sysfs_dev_parent == NULL)
 171                         break;
 172
 173                 //sysfs_close_device(sysfs_dev);
 174                 sysfs_dev = sysfs_dev_parent;
 175         }
 176         sysfs_close_device(sysfs_dev);
 177
 178 exit:
 179         //sysfs_close_class_device(class_dev);
 180         return retval;
 181 }
 182
 183 static int process_options(void)
 184 {
 185         static const char short_options[] = "adn:p:q:rVh";
 186         int option;
 187         int retval = 1;
 188         struct udevice dev;
 189         int root = 0;
 190         int attributes = 0;
 191         enum query_type query = NONE;
 192         char result[NAME_SIZE] = "";
 193         char path[NAME_SIZE] = "";
 194         char name[NAME_SIZE] = "";
 195         char temp[NAME_SIZE];
 196         char *pos;
 197
 198         /* get command line options */
 199         while (1) {
 200                 option = getopt(main_argc, main_argv, short_options);
 201                 if (option == -1)
 202                         break;
 203
 204                 dbg("option '%c'", option);
 205                 switch (option) {
 206                 case 'n':
 207                         dbg("udev name: %s\n", optarg);
 208                         strfieldcpy(name, optarg);
 209                         break;
 210
 211                 case 'p':
 212                         dbg("udev path: %s\n", optarg);
 213                         strfieldcpy(path, optarg);
 214                         break;
 215
 216                 case 'q':
 217                         dbg("udev query: %s\n", optarg);
 218
 219                         if (strcmp(optarg, "name") == 0) {
 220                                 query = NAME;
 221                                 break;
 222                         }
 223
 224                         if (strcmp(optarg, "symlink") == 0) {
 225                                 query = SYMLINK;
 226                                 break;
 227                         }
 228
 229                         if (strcmp(optarg, "mode") == 0) {
 230                                 query = MODE;
 231                                 break;
 232                         }
 233
 234                         if (strcmp(optarg, "owner") == 0) {
 235                                 query = OWNER;
 236                                 break;
 237                         }
 238
 239                         if (strcmp(optarg, "group") == 0) {
 240                                 query = GROUP;
 241                                 break;
 242                         }
 243
 244                         if (strcmp(optarg, "path") == 0) {
 245                                 query = PATH;
 246                                 break;
 247                         }
 248
 249                         printf("unknown query type\n");
 250                         exit(1);
 251
 252                 case 'r':
 253                         root = 1;
 254                         break;
 255
 256                 case 'a':
 257                         attributes = 1;
 258                         break;
 259
 260                 case 'd':
 261                         retval = udevdb_open_ro();
 262                         if (retval != 0) {
 263                                 printf("unable to open udev database\n");
 264                                 exit(2);
 265                         }
 266                         udevdb_call_foreach(print_record);
 267                         udevdb_exit();
 268                         exit(0);
 269
 270                 case 'V':
 271                         printf("udevinfo, version %s\n", UDEV_VERSION);
 272                         exit(0);
 273
 274                 case 'h':
 275                         retval = 0;
 276                 case '?':
 277                 default:
 278                         goto help;
 279                 }
 280         }
 281
 282         /* process options */
 283         if (query != NONE) {
 284                 retval = udevdb_open_ro();
 285                 if (retval != 0) {
 286                         printf("unable to open udev database\n");
 287                         return -EACCES;
 288                 }
 289
 290                 if (path[0] != '\0') {
 291                         /* remove sysfs_path if given */
 292                         if (strncmp(path, sysfs_path, strlen(sysfs_path)) == 0) {
 293                                 pos = path + strlen(sysfs_path);
 294                         } else {
 295                                 if (path[0] != '/') {
 296                                         /* prepend '/' if missing */
 297                                         strcat(temp, "/");
 298                                         strncat(temp, path, sizeof(path));
 299                                         pos = temp;
 300                                 } else {
 301                                         pos = path;
 302                                 }
 303                         }
 304                         retval = udevdb_get_dev(pos, &dev);
 305                         if (retval != 0) {
 306                                 printf("device not found in database\n");
 307                                 goto exit;
 308                         }
 309                         goto print;
 310                 }
 311
 312                 if (name[0] != '\0') {
 313                         /* remove udev_root if given */
 314                         if (strncmp(name, udev_root, strlen(udev_root)) == 0) {
 315                                 pos = name + strlen(udev_root);
 316                         } else
 317                                 pos = name;
 318                         retval = udevdb_get_dev_byname(pos, path, &dev);
 319                         if (retval != 0) {
 320                                 printf("device not found in database\n");
 321                                 goto exit;
 322                         }
 323                         goto print;
 324                 }
 325
 326                 printf("query needs device path(-p) or node name(-n) specified\n");
 327                 goto exit;
 328
 329 print:
 330                 switch(query) {
 331                 case NAME:
 332                         if (root)
 333                                 strfieldcpy(result, udev_root);
 334                         strncat(result, dev.name, sizeof(result));
 335                         break;
 336
 337                 case SYMLINK:
 338                         strfieldcpy(result, dev.symlink);
 339                         break;
 340
 341                 case MODE:
 342                         sprintf(result, "%#o", dev.mode);
 343                         break;
 344
 345                 case GROUP:
 346                         strfieldcpy(result, dev.group);
 347                         break;
 348
 349                 case OWNER:
 350                         strfieldcpy(result, dev.owner);
 351                         break;
 352
 353                 case PATH:
 354                         strfieldcpy(result, path);
 355                         break;
 356
 357                 default:
 358                         goto exit;
 359                 }
 360                 printf("%s\n", result);
 361
 362 exit:
 363                 udevdb_exit();
 364                 return retval;
 365         }
 366
 367         if (attributes) {
 368                 if (path[0] == '\0') {
 369                         printf("attribute walk on device chain needs path(-p) specified\n");
 370                         return -EINVAL;
 371                 } else {
 372                         if (strncmp(path, sysfs_path, strlen(sysfs_path)) != 0) {
 373                                 /* prepend sysfs mountpoint if not given */
 374                                 strfieldcpy(temp, path);
 375                                 strfieldcpy(path, sysfs_path);
 376                                 strncat(path, temp, sizeof(path));
 377                         }
 378                         print_device_chain(path);
 379                         return 0;
 380                 }
 381         }
 382
 383         if (root) {
 384                 printf("%s\n", udev_root);
 385                 return 0;
 386         }
 387
 388 help:
 389         printf("Usage: [-anpqrdVh]\n"
 390                "  -q TYPE  query database for the specified value:\n"
 391                "             'name'    name of device node\n"
 392                "             'symlink' pointing to node\n"
 393                "             'mode'    permissions of node\n"
 394                "             'owner'   of node\n"
 395                "             'group'   of node\n"
 396                "             'path'    sysfs device path\n"
 397                "  -p PATH  sysfs device path used for query or chain\n"
 398                "  -n NAME  node name used for query\n"
 399                "\n"
 400                "  -r       print udev root\n"
 401                "  -a       print all SYSFS_attributes along the device chain\n"
 402                "  -d       dump whole database\n"
 403                "  -V       print udev version\n"
 404                "  -h       print this help text\n"
 405                "\n");
 406         return retval;
 407 }
 408
 409 int main(int argc, char *argv[], char *envp[])
 410 {
 411         int retval;
 412
 413         main_argv = argv;
 414         main_argc = argc;
 415
 416         init_logging("udevinfo");
 417
 418         /* initialize our configuration */
 419         udev_init_config();
 420
 421         retval = process_options();
 422         if (retval != 0)
 423                 exit(1);
 424         exit(0);
 425 }