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 "libsysfs/sysfs/libsysfs.h"
  31 #include "libsysfs/dlist.h"
  32 #include "udev.h"
  33 #include "udev_version.h"
  34 #include "logging.h"
  35 #include "udevdb.h"
  36
  37
  38 # define SYSFS_VALUE_MAX 200
  39
  40 char **main_argv;
  41 int main_argc;
  42
  43 #ifdef LOG
  44 unsigned char logname[42];
  45 void log_message (int level, const char *format, ...)
  46 {
  47         va_list args;
  48
  49         va_start(args, format);
  50         vsyslog(level, format, args);
  51         va_end(args);
  52 }
  53 #endif
  54
  55 static int print_all_attributes(const char *path)
  56 {
  57         struct dlist *attributes;
  58         struct sysfs_attribute *attr;
  59         struct sysfs_directory *sysfs_dir;
  60         char value[SYSFS_VALUE_MAX];
  61         int len;
  62         int retval = 0;
  63
  64         sysfs_dir = sysfs_open_directory(path);
  65         if (sysfs_dir == NULL)
  66                 return -1;
  67
  68         attributes = sysfs_get_dir_attributes(sysfs_dir);
  69         if (attributes == NULL) {
  70                 retval = -1;
  71                 goto exit;
  72         }
  73
  74         dlist_for_each_data(attributes, attr, struct sysfs_attribute) {
  75                 if (attr->value != NULL) {
  76                         strfieldcpy(value, attr->value);
  77                         len = strlen(value);
  78                         if (len == 0)
  79                                 continue;
  80
  81                         /* remove trailing newline */
  82                         if (value[len-1] == '\n') {
  83                                 value[len-1] = '\0';
  84                                 len--;
  85                         }
  86
  87                         /* skip nonprintable values */
  88                         while (len) {
  89                                 if (isprint(value[len-1]) == 0)
  90                                         break;
  91                                 len--;
  92                         }
  93                         if (len == 0)
  94                                 printf("    SYSFS{%s}=\"%s\"\n", attr->name, value);
  95                 }
  96         }
  97         printf("\n");
  98
  99 exit:
 100         sysfs_close_directory(sysfs_dir);
 101
 102         return retval;
 103 }
 104
 105 /* callback for database dump */
 106 static int print_record(char *path, struct udevice *dev)
 107 {
 108         printf("P: %s\n", path);
 109         printf("N: %s\n", dev->name);
 110         printf("M: %#o\n", dev->mode);
 111         printf("S: %s\n", dev->symlink);
 112         printf("O: %s\n", dev->owner);
 113         printf("G: %s\n", dev->group);
 114         printf("\n");
 115         return 0;
 116 }
 117
 118 enum query_type {
 119         NONE,
 120         NAME,
 121         PATH,
 122         SYMLINK,
 123         MODE,
 124         OWNER,
 125         GROUP
 126 };
 127
 128 static int print_device_chain(const char *path)
 129 {
 130         struct sysfs_class_device *class_dev;
 131         struct sysfs_class_device *class_dev_parent;
 132         struct sysfs_attribute *attr;
 133         struct sysfs_device *sysfs_dev;
 134         struct sysfs_device *sysfs_dev_parent;
 135         int retval = 0;
 136
 137         /*  get the class dev */
 138         class_dev = sysfs_open_class_device_path(path);
 139         if (class_dev == NULL) {
 140                 printf("couldn't get the class device\n");
 141                 return -1;
 142         }
 143
 144         /* read the 'dev' file for major/minor*/
 145         attr = sysfs_get_classdev_attr(class_dev, "dev");
 146         if (attr == NULL) {
 147                 printf("couldn't get the \"dev\" file\n");
 148                 retval = -1;
 149                 goto exit;
 150         }
 151         printf("\ndevice '%s' has major:minor %s", class_dev->path, attr->value);
 152         sysfs_close_attribute(attr);
 153
 154         /* open sysfs class device directory and print all attributes */
 155         printf("  looking at class device '%s':\n", class_dev->path);
 156         if (print_all_attributes(class_dev->path) != 0) {
 157                 printf("couldn't open class device directory\n");
 158                 retval = -1;
 159                 goto exit;
 160         }
 161
 162         /* get the device link (if parent exists look here) */
 163         class_dev_parent = sysfs_get_classdev_parent(class_dev);
 164         if (class_dev_parent != NULL) {
 165                 //sysfs_close_class_device(class_dev);
 166                 class_dev = class_dev_parent;
 167         }
 168         sysfs_dev = sysfs_get_classdev_device(class_dev);
 169         if (sysfs_dev != NULL)
 170                 printf("follow the class device's \"device\"\n");
 171
 172         /* look the device chain upwards */
 173         while (sysfs_dev != NULL) {
 174                 printf("  looking at the device chain at '%s':\n", sysfs_dev->path);
 175                 printf("    BUS=\"%s\"\n", sysfs_dev->bus);
 176                 printf("    ID=\"%s\"\n", sysfs_dev->bus_id);
 177
 178                 /* open sysfs device directory and print all attributes */
 179                 print_all_attributes(sysfs_dev->path);
 180
 181                 sysfs_dev_parent = sysfs_get_device_parent(sysfs_dev);
 182                 if (sysfs_dev_parent == NULL)
 183                         break;
 184
 185                 //sysfs_close_device(sysfs_dev);
 186                 sysfs_dev = sysfs_dev_parent;
 187         }
 188         sysfs_close_device(sysfs_dev);
 189
 190 exit:
 191         //sysfs_close_class_device(class_dev);
 192         return retval;
 193 }
 194
 195 static int process_options(void)
 196 {
 197         static const char short_options[] = "adn:p:q:rVh";
 198         int option;
 199         int retval = 1;
 200         struct udevice dev;
 201         int root = 0;
 202         int attributes = 0;
 203         enum query_type query = NONE;
 204         char result[NAME_SIZE] = "";
 205         char path[NAME_SIZE] = "";
 206         char name[NAME_SIZE] = "";
 207         char temp[NAME_SIZE];
 208         char *pos;
 209
 210         /* get command line options */
 211         while (1) {
 212                 option = getopt(main_argc, main_argv, short_options);
 213                 if (option == -1)
 214                         break;
 215
 216                 dbg("option '%c'", option);
 217                 switch (option) {
 218                 case 'n':
 219                         dbg("udev name: %s\n", optarg);
 220                         strfieldcpy(name, optarg);
 221                         break;
 222
 223                 case 'p':
 224                         dbg("udev path: %s\n", optarg);
 225                         strfieldcpy(path, optarg);
 226                         break;
 227
 228                 case 'q':
 229                         dbg("udev query: %s\n", optarg);
 230
 231                         if (strcmp(optarg, "name") == 0) {
 232                                 query = NAME;
 233                                 break;
 234                         }
 235
 236                         if (strcmp(optarg, "symlink") == 0) {
 237                                 query = SYMLINK;
 238                                 break;
 239                         }
 240
 241                         if (strcmp(optarg, "mode") == 0) {
 242                                 query = MODE;
 243                                 break;
 244                         }
 245
 246                         if (strcmp(optarg, "owner") == 0) {
 247                                 query = OWNER;
 248                                 break;
 249                         }
 250
 251                         if (strcmp(optarg, "group") == 0) {
 252                                 query = GROUP;
 253                                 break;
 254                         }
 255
 256                         if (strcmp(optarg, "path") == 0) {
 257                                 query = PATH;
 258                                 break;
 259                         }
 260
 261                         printf("unknown query type\n");
 262                         exit(1);
 263
 264                 case 'r':
 265                         root = 1;
 266                         break;
 267
 268                 case 'a':
 269                         attributes = 1;
 270                         break;
 271
 272                 case 'd':
 273                         retval = udevdb_open_ro();
 274                         if (retval != 0) {
 275                                 printf("unable to open udev database\n");
 276                                 exit(2);
 277                         }
 278                         udevdb_call_foreach(print_record);
 279                         udevdb_exit();
 280                         exit(0);
 281
 282                 case 'V':
 283                         printf("udevinfo, version %s\n", UDEV_VERSION);
 284                         exit(0);
 285
 286                 case 'h':
 287                         retval = 0;
 288                 case '?':
 289                 default:
 290                         goto help;
 291                 }
 292         }
 293
 294         /* process options */
 295         if (query != NONE) {
 296                 retval = udevdb_open_ro();
 297                 if (retval != 0) {
 298                         printf("unable to open udev database\n");
 299                         return -EACCES;
 300                 }
 301
 302                 if (path[0] != '\0') {
 303                         /* remove sysfs_path if given */
 304                         if (strncmp(path, sysfs_path, strlen(sysfs_path)) == 0) {
 305                                 pos = path + strlen(sysfs_path);
 306                         } else {
 307                                 if (path[0] != '/') {
 308                                         /* prepend '/' if missing */
 309                                         strfieldcat(temp, "/");
 310                                         strfieldcat(temp, path);
 311                                         pos = temp;
 312                                 } else {
 313                                         pos = path;
 314                                 }
 315                         }
 316                         retval = udevdb_get_dev(pos, &dev);
 317                         if (retval != 0) {
 318                                 printf("device not found in database\n");
 319                                 goto exit;
 320                         }
 321                         goto print;
 322                 }
 323
 324                 if (name[0] != '\0') {
 325                         /* remove udev_root if given */
 326                         if (strncmp(name, udev_root, strlen(udev_root)) == 0) {
 327                                 pos = name + strlen(udev_root);
 328                         } else
 329                                 pos = name;
 330                         retval = udevdb_get_dev_byname(pos, path, &dev);
 331                         if (retval != 0) {
 332                                 printf("device not found in database\n");
 333                                 goto exit;
 334                         }
 335                         goto print;
 336                 }
 337
 338                 printf("query needs device path(-p) or node name(-n) specified\n");
 339                 goto exit;
 340
 341 print:
 342                 switch(query) {
 343                 case NAME:
 344                         if (root)
 345                                 strfieldcpy(result, udev_root);
 346                         strfieldcat(result, dev.name);
 347                         break;
 348
 349                 case SYMLINK:
 350                         strfieldcpy(result, dev.symlink);
 351                         break;
 352
 353                 case MODE:
 354                         sprintf(result, "%#o", dev.mode);
 355                         break;
 356
 357                 case GROUP:
 358                         strfieldcpy(result, dev.group);
 359                         break;
 360
 361                 case OWNER:
 362                         strfieldcpy(result, dev.owner);
 363                         break;
 364
 365                 case PATH:
 366                         strfieldcpy(result, path);
 367                         break;
 368
 369                 default:
 370                         goto exit;
 371                 }
 372                 printf("%s\n", result);
 373
 374 exit:
 375                 udevdb_exit();
 376                 return retval;
 377         }
 378
 379         if (attributes) {
 380                 if (path[0] == '\0') {
 381                         printf("attribute walk on device chain needs path(-p) specified\n");
 382                         return -EINVAL;
 383                 } else {
 384                         if (strncmp(path, sysfs_path, strlen(sysfs_path)) != 0) {
 385                                 /* prepend sysfs mountpoint if not given */
 386                                 strfieldcpy(temp, path);
 387                                 strfieldcpy(path, sysfs_path);
 388                                 strfieldcat(path, temp);
 389                         }
 390                         print_device_chain(path);
 391                         return 0;
 392                 }
 393         }
 394
 395         if (root) {
 396                 printf("%s\n", udev_root);
 397                 return 0;
 398         }
 399
 400 help:
 401         printf("Usage: [-anpqrdVh]\n"
 402                "  -q TYPE  query database for the specified value:\n"
 403                "             'name'    name of device node\n"
 404                "             'symlink' pointing to node\n"
 405                "             'mode'    permissions of node\n"
 406                "             'owner'   of node\n"
 407                "             'group'   of node\n"
 408                "             'path'    sysfs device path\n"
 409                "  -p PATH  sysfs device path used for query or chain\n"
 410                "  -n NAME  node name used for query\n"
 411                "\n"
 412                "  -r       print udev root\n"
 413                "  -a       print all SYSFS_attributes along the device chain\n"
 414                "  -d       dump whole database\n"
 415                "  -V       print udev version\n"
 416                "  -h       print this help text\n"
 417                "\n");
 418         return retval;
 419 }
 420
 421 int main(int argc, char *argv[], char *envp[])
 422 {
 423         int retval;
 424
 425         main_argv = argv;
 426         main_argc = argc;
 427
 428         init_logging("udevinfo");
 429
 430         /* initialize our configuration */
 431         udev_init_config();
 432
 433         retval = process_options();
 434         if (retval != 0)
 435                 exit(1);
 436         exit(0);
 437 }