extras/usb_id/usb_id.c

   1 /*
   2  * usb_id - identify an USB device
   3  *
   4  * Copyright (c) 2005 SUSE Linux Products GmbH, Germany
   5  *
   6  * Author:
   7  *      Hannes Reinecke <hare@suse.de>
   8  *
   9  *      This program is free software; you can redistribute it and/or modify it
  10  *      under the terms of the GNU General Public License as published by the
  11  *      Free Software Foundation version 2 of the License.
  12  */
  13
  14 #include <stdio.h>
  15 #include <stdlib.h>
  16 #include <stdarg.h>
  17 #include <unistd.h>
  18 #include <string.h>
  19 #include <ctype.h>
  20 #include <errno.h>
  21 #include <getopt.h>
  22
  23 #include "../../udev/udev.h"
  24
  25 int debug;
  26
  27 static void log_fn(struct udev *udev, int priority,
  28                    const char *file, int line, const char *fn,
  29                    const char *format, va_list args)
  30 {
  31         if (debug) {
  32                 fprintf(stderr, "%s: ", fn != NULL ? fn : file);
  33                 vfprintf(stderr, format, args);
  34         } else {
  35                 vsyslog(priority, format, args);
  36         }
  37 }
  38
  39 static char vendor_str[64];
  40 static char model_str[64];
  41 static char serial_str[UTIL_NAME_SIZE];
  42 static char revision_str[64];
  43 static char type_str[64];
  44 static char instance_str[64];
  45
  46 static int use_usb_info;
  47 static int use_num_info;
  48
  49 static void set_usb_iftype(char *to, int if_class_num, size_t len)
  50 {
  51         char *type = "generic";
  52
  53         switch (if_class_num) {
  54         case 1:
  55                 type = "audio";
  56                 break;
  57         case 2: /* CDC-Control */
  58                 break;
  59         case 3:
  60                 type = "hid";
  61                 break;
  62         case 5: /* Physical */
  63                 break;
  64         case 6:
  65                 type = "image";
  66                 break;
  67         case 7:
  68                 type = "printer";
  69                 break;
  70         case 8:
  71                 type = "storage";
  72                 break;
  73         case 9:
  74                 type = "hub";
  75                 break;
  76         case 0x0a: /* CDC-Data */
  77                 break;
  78         case 0x0b: /* Chip/Smart Card */
  79                 break;
  80         case 0x0d: /* Content Security */
  81                 break;
  82         case 0x0e:
  83                 type = "video";
  84                 break;
  85         case 0xdc: /* Diagnostic Device */
  86                 break;
  87         case 0xe0: /* Wireless Controller */
  88                 break;
  89         case 0xfe: /* Application-specific */
  90                 break;
  91         case 0xff: /* Vendor-specific */
  92                 break;
  93         default:
  94                 break;
  95         }
  96         strncpy(to, type, len);
  97         to[len-1] = '\0';
  98 }
  99
 100 static int set_usb_mass_storage_ifsubtype(char *to, const char *from, size_t len)
 101 {
 102         int type_num = 0;
 103         char *eptr;
 104         char *type = "generic";
 105
 106         type_num = strtoul(from, &eptr, 0);
 107         if (eptr != from) {
 108                 switch (type_num) {
 109                 case 2:
 110                         type = "cd";
 111                         break;
 112                 case 3:
 113                         type = "tape";
 114                         break;
 115                 case 4: /* UFI */
 116                 case 5: /* SFF-8070i */
 117                         type = "floppy";
 118                         break;
 119                 case 1: /* RBC devices */
 120                         type = "rbc";
 121                         break;
 122                 case 6: /* Transparent SPC-2 devices */
 123                         type = "scsi";
 124                         break;
 125                 default:
 126                         break;
 127                 }
 128         }
 129         util_strlcpy(to, type, len);
 130
 131         return type_num;
 132 }
 133
 134 static void set_scsi_type(char *to, const char *from, size_t len)
 135 {
 136         int type_num;
 137         char *eptr;
 138         char *type = "generic";
 139
 140         type_num = strtoul(from, &eptr, 0);
 141         if (eptr != from) {
 142                 switch (type_num) {
 143                 case 0:
 144                 case 0xe:
 145                         type = "disk";
 146                         break;
 147                 case 1:
 148                         type = "tape";
 149                         break;
 150                 case 4:
 151                 case 7:
 152                 case 0xf:
 153                         type = "optical";
 154                         break;
 155                 case 5:
 156                         type = "cd";
 157                         break;
 158                 default:
 159                         break;
 160                 }
 161         }
 162         util_strlcpy(to, type, len);
 163 }
 164
 165 /*
 166  * A unique USB identification is generated like this:
 167  *
 168  * 1.) Get the USB device type from DeviceClass, InterfaceClass
 169  *     and InterfaceSubClass
 170  * 2.) If the device type is 'Mass-Storage/SPC-2' or 'Mass-Storage/RBC'
 171  *     use the SCSI vendor and model as USB-Vendor and USB-model.
 172  * 3.) Otherwise use the USB manufacturer and product as
 173  *     USB-Vendor and USB-model. Any non-printable characters
 174  *     in those strings will be skipped; a slash '/' will be converted
 175  *     into a full stop '.'.
 176  * 4.) If that fails, too, we will use idVendor and idProduct
 177  *     as USB-Vendor and USB-model.
 178  * 5.) The USB identification is the USB-vendor and USB-model
 179  *     string concatenated with an underscore '_'.
 180  * 6.) If the device supplies a serial number, this number
 181  *     is concatenated with the identification with an underscore '_'.
 182  */
 183 static int usb_id(struct udev_device *dev)
 184 {
 185         struct udev *udev = udev_device_get_udev(dev);
 186         struct udev_device *dev_interface;
 187         struct udev_device *dev_usb;
 188         const char *if_class, *if_subclass;
 189         int if_class_num;
 190         int protocol = 0;
 191
 192         dbg(udev, "syspath %s\n", udev_device_get_syspath(dev));
 193
 194         /* usb interface directory */
 195         dev_interface = udev_device_get_parent_with_subsystem(dev, "usb");
 196         if (dev_interface == NULL) {
 197                 info(udev, "unable to access usb_interface device of '%s'\n",
 198                      udev_device_get_syspath(dev));
 199                 return 1;
 200         }
 201
 202         if_class = udev_device_get_sysattr_value(dev_interface, "bInterfaceClass");
 203         if (!if_class) {
 204                 info(udev, "%s: cannot get bInterfaceClass attribute\n",
 205                      udev_device_get_sysname(dev));
 206                 return 1;
 207         }
 208         if_class_num = strtoul(if_class, NULL, 16);
 209         if (if_class_num == 8) {
 210                 if_subclass = udev_device_get_sysattr_value(dev_interface, "bInterfaceSubClass");
 211                 if (if_subclass != NULL)
 212                         protocol = set_usb_mass_storage_ifsubtype(type_str, if_subclass, sizeof(type_str)-1);
 213         } else {
 214                 set_usb_iftype(type_str, if_class_num, sizeof(type_str)-1);
 215         }
 216
 217         info(udev, "%s: if_class %d protocol %d\n",
 218              udev_device_get_syspath(dev_interface), if_class_num, protocol);
 219
 220         /* usb device directory */
 221         dev_usb = udev_device_get_parent_with_subsystem(dev_interface, "usb");
 222         if (!dev_usb) {
 223                 info(udev, "unable to find parent 'usb' device of '%s'\n",
 224                      udev_device_get_syspath(dev));
 225                 return 1;
 226         }
 227
 228         /* mass storage */
 229         if (protocol == 6 && !use_usb_info) {
 230                 struct udev_device *dev_scsi;
 231                 const char *scsi_model, *scsi_vendor, *scsi_type, *scsi_rev;
 232                 int host, bus, target, lun;
 233
 234                 /* get scsi device */
 235                 dev_scsi = udev_device_get_parent_with_subsystem(dev, "scsi");
 236                 if (dev_scsi == NULL) {
 237                         info(udev, "unable to find parent 'scsi' device of '%s'\n",
 238                              udev_device_get_syspath(dev));
 239                         goto fallback;
 240                 }
 241                 if (sscanf(udev_device_get_sysname(dev_scsi), "%d:%d:%d:%d", &host, &bus, &target, &lun) != 4) {
 242                         info(udev, "invalid scsi device '%s'\n", udev_device_get_sysname(dev_scsi));
 243                         goto fallback;
 244                 }
 245
 246                 /* Generic SPC-2 device */
 247                 scsi_vendor = udev_device_get_sysattr_value(dev_scsi, "vendor");
 248                 if (!scsi_vendor) {
 249                         info(udev, "%s: cannot get SCSI vendor attribute\n",
 250                              udev_device_get_sysname(dev_scsi));
 251                         goto fallback;
 252                 }
 253                 udev_util_replace_whitespace(scsi_vendor, vendor_str, sizeof(vendor_str)-1);
 254                 udev_util_replace_chars(vendor_str, NULL);
 255
 256                 scsi_model = udev_device_get_sysattr_value(dev_scsi, "model");
 257                 if (!scsi_model) {
 258                         info(udev, "%s: cannot get SCSI model attribute\n",
 259                              udev_device_get_sysname(dev_scsi));
 260                         goto fallback;
 261                 }
 262                 udev_util_replace_whitespace(scsi_model, model_str, sizeof(model_str)-1);
 263                 udev_util_replace_chars(model_str, NULL);
 264
 265                 scsi_type = udev_device_get_sysattr_value(dev_scsi, "type");
 266                 if (!scsi_type) {
 267                         info(udev, "%s: cannot get SCSI type attribute\n",
 268                              udev_device_get_sysname(dev_scsi));
 269                         goto fallback;
 270                 }
 271                 set_scsi_type(type_str, scsi_type, sizeof(type_str)-1);
 272
 273                 scsi_rev = udev_device_get_sysattr_value(dev_scsi, "rev");
 274                 if (!scsi_rev) {
 275                         info(udev, "%s: cannot get SCSI revision attribute\n",
 276                              udev_device_get_sysname(dev_scsi));
 277                         goto fallback;
 278                 }
 279                 udev_util_replace_whitespace(scsi_rev, revision_str, sizeof(revision_str)-1);
 280                 udev_util_replace_chars(revision_str, NULL);
 281
 282                 /*
 283                  * some broken devices have the same identifiers
 284                  * for all luns, export the target:lun number
 285                  */
 286                 sprintf(instance_str, "%d:%d", target, lun);
 287         }
 288
 289 fallback:
 290         /* fallback to USB vendor & device */
 291         if (vendor_str[0] == '\0') {
 292                 const char *usb_vendor = NULL;
 293
 294                 if (!use_num_info)
 295                         usb_vendor = udev_device_get_sysattr_value(dev_usb, "manufacturer");
 296
 297                 if (!usb_vendor)
 298                         usb_vendor = udev_device_get_sysattr_value(dev_usb, "idVendor");
 299
 300                 if (!usb_vendor) {
 301                         info(udev, "No USB vendor information available\n");
 302                         return 1;
 303                 }
 304                 udev_util_replace_whitespace(usb_vendor, vendor_str, sizeof(vendor_str)-1);
 305                 udev_util_replace_chars(vendor_str, NULL);
 306         }
 307
 308         if (model_str[0] == '\0') {
 309                 const char *usb_model = NULL;
 310
 311                 if (!use_num_info)
 312                         usb_model = udev_device_get_sysattr_value(dev_usb, "product");
 313
 314                 if (!usb_model)
 315                         usb_model = udev_device_get_sysattr_value(dev_usb, "idProduct");
 316
 317                 if (!usb_model) {
 318                         dbg(udev, "No USB model information available\n");
 319                         return 1;
 320                 }
 321                 udev_util_replace_whitespace(usb_model, model_str, sizeof(model_str)-1);
 322                 udev_util_replace_chars(model_str, NULL);
 323         }
 324
 325         if (revision_str[0] == '\0') {
 326                 const char *usb_rev;
 327
 328                 usb_rev = udev_device_get_sysattr_value(dev_usb, "bcdDevice");
 329                 if (usb_rev) {
 330                         udev_util_replace_whitespace(usb_rev, revision_str, sizeof(revision_str)-1);
 331                         udev_util_replace_chars(revision_str, NULL);
 332                 }
 333         }
 334
 335         if (serial_str[0] == '\0') {
 336                 const char *usb_serial;
 337
 338                 usb_serial = udev_device_get_sysattr_value(dev_usb, "serial");
 339                 if (usb_serial) {
 340                         udev_util_replace_whitespace(usb_serial, serial_str, sizeof(serial_str)-1);
 341                         udev_util_replace_chars(serial_str, NULL);
 342                 }
 343         }
 344         return 0;
 345 }
 346
 347 int main(int argc, char **argv)
 348 {
 349         static const struct option options[] = {
 350                 { "usb-info", no_argument, NULL, 'u' },
 351                 { "num-info", no_argument, NULL, 'n' },
 352                 { "export", no_argument, NULL, 'x' },
 353                 { "debug", no_argument, NULL, 'd' },
 354                 { "help", no_argument, NULL, 'h' },
 355                 {}
 356         };
 357         struct udev *udev;
 358         struct udev_device *dev = NULL;
 359         char syspath[UTIL_PATH_SIZE];
 360         const char *devpath;
 361         static int export;
 362         int retval = 0;
 363
 364         udev = udev_new();
 365         if (udev == NULL)
 366                 goto exit;
 367
 368         logging_init("usb_id");
 369         udev_set_log_fn(udev, log_fn);
 370
 371         while (1) {
 372                 int option;
 373
 374                 option = getopt_long(argc, argv, "dnuxh", options, NULL);
 375                 if (option == -1)
 376                         break;
 377
 378                 switch (option) {
 379                 case 'd':
 380                         debug = 1;
 381                         if (udev_get_log_priority(udev) < LOG_INFO)
 382                                 udev_set_log_priority(udev, LOG_INFO);
 383                         break;
 384                 case 'n':
 385                         use_num_info = 1;
 386                         use_usb_info = 1;
 387                         break;
 388                 case 'u':
 389                         use_usb_info = 1;
 390                         break;
 391                 case 'x':
 392                         export = 1;
 393                         break;
 394                 case 'h':
 395                         printf("Usage: usb_id [--usb-info] [--num-info] [--export] [--help] <devpath>\n"
 396                                "  --usb-info  use usb strings instead\n"
 397                                "  --num-info  use numerical values\n"
 398                                "  --export    print values as environemt keys\n"
 399                                "  --help      print this help text\n\n");
 400                 default:
 401                         retval = 1;
 402                         goto exit;
 403                 }
 404         }
 405
 406         devpath = getenv("DEVPATH");
 407         if (devpath == NULL)
 408                 devpath = argv[optind];
 409         if (devpath == NULL) {
 410                 fprintf(stderr, "No device specified\n");
 411                 retval = 1;
 412                 goto exit;
 413         }
 414
 415         util_strlcpy(syspath, udev_get_sys_path(udev), sizeof(syspath));
 416         util_strlcat(syspath, devpath, sizeof(syspath));
 417         dev = udev_device_new_from_syspath(udev, syspath);
 418         if (dev == NULL) {
 419                 err(udev, "unable to access '%s'\n", devpath);
 420                 return 1;
 421         }
 422
 423         retval = usb_id(dev);
 424         if (retval == 0) {
 425                 char serial[256];
 426
 427                 util_strlcpy(serial, vendor_str, sizeof(serial));
 428                 util_strlcat(serial, "_", sizeof(serial));
 429                 util_strlcat(serial, model_str, sizeof(serial));
 430                 if (serial_str[0] != '\0') {
 431                         util_strlcat(serial, "_", sizeof(serial));
 432                         util_strlcat(serial, serial_str, sizeof(serial));
 433                 }
 434                 if (instance_str[0] != '\0') {
 435                         util_strlcat(serial, "-", sizeof(serial));
 436                         util_strlcat(serial, instance_str, sizeof(serial));
 437                 }
 438
 439                 if (export) {
 440                         printf("ID_VENDOR=%s\n", vendor_str);
 441                         printf("ID_MODEL=%s\n", model_str);
 442                         printf("ID_REVISION=%s\n", revision_str);
 443                         printf("ID_SERIAL=%s\n", serial);
 444                         if (serial_str[0] != '\0')
 445                                 printf("ID_SERIAL_SHORT=%s\n", serial_str);
 446                         printf("ID_TYPE=%s\n", type_str);
 447                         if (instance_str[0] != '\0')
 448                                 printf("ID_INSTANCE=%s\n", instance_str);
 449                         printf("ID_BUS=usb\n");
 450                 } else
 451                         printf("%s\n", serial);
 452         }
 453
 454 exit:
 455         udev_device_unref(dev);
 456         udev_unref(udev);
 457         logging_close();
 458         return retval;
 459 }