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 <fcntl.h>
  21 #include <errno.h>
  22 #include <getopt.h>
  23
  24 #include "../../udev/udev.h"
  25
  26 int debug;
  27
  28 static void log_fn(struct udev *udev, int priority,
  29                    const char *file, int line, const char *fn,
  30                    const char *format, va_list args)
  31 {
  32         if (debug) {
  33                 fprintf(stderr, "%s: ", fn != NULL ? fn : file);
  34                 vfprintf(stderr, format, args);
  35         } else {
  36                 vsyslog(priority, format, args);
  37         }
  38 }
  39
  40 static char vendor_str[64];
  41 static char vendor_str_enc[256];
  42 static const char *vendor_id = "";
  43 static char model_str[64];
  44 static char model_str_enc[256];
  45 static const char *product_id = "";
  46 static char serial_str[UTIL_NAME_SIZE];
  47 static char packed_if_str[UTIL_NAME_SIZE];
  48 static char revision_str[64];
  49 static char type_str[64];
  50 static char instance_str[64];
  51 static const char *ifnum;
  52 static const char *driver;
  53
  54 static int use_usb_info;
  55 static int use_num_info;
  56
  57 static void set_usb_iftype(char *to, int if_class_num, size_t len)
  58 {
  59         char *type = "generic";
  60
  61         switch (if_class_num) {
  62         case 1:
  63                 type = "audio";
  64                 break;
  65         case 2: /* CDC-Control */
  66                 break;
  67         case 3:
  68                 type = "hid";
  69                 break;
  70         case 5: /* Physical */
  71                 break;
  72         case 6:
  73                 type = "media";
  74                 break;
  75         case 7:
  76                 type = "printer";
  77                 break;
  78         case 8:
  79                 type = "storage";
  80                 break;
  81         case 9:
  82                 type = "hub";
  83                 break;
  84         case 0x0a: /* CDC-Data */
  85                 break;
  86         case 0x0b: /* Chip/Smart Card */
  87                 break;
  88         case 0x0d: /* Content Security */
  89                 break;
  90         case 0x0e:
  91                 type = "video";
  92                 break;
  93         case 0xdc: /* Diagnostic Device */
  94                 break;
  95         case 0xe0: /* Wireless Controller */
  96                 break;
  97         case 0xfe: /* Application-specific */
  98                 break;
  99         case 0xff: /* Vendor-specific */
 100                 break;
 101         default:
 102                 break;
 103         }
 104         strncpy(to, type, len);
 105         to[len-1] = '\0';
 106 }
 107
 108 static int set_usb_mass_storage_ifsubtype(char *to, const char *from, size_t len)
 109 {
 110         int type_num = 0;
 111         char *eptr;
 112         char *type = "generic";
 113
 114         type_num = strtoul(from, &eptr, 0);
 115         if (eptr != from) {
 116                 switch (type_num) {
 117                 case 2:
 118                         type = "atapi";
 119                         break;
 120                 case 3:
 121                         type = "tape";
 122                         break;
 123                 case 4: /* UFI */
 124                 case 5: /* SFF-8070i */
 125                         type = "floppy";
 126                         break;
 127                 case 1: /* RBC devices */
 128                         type = "rbc";
 129                         break;
 130                 case 6: /* Transparent SPC-2 devices */
 131                         type = "scsi";
 132                         break;
 133                 default:
 134                         break;
 135                 }
 136         }
 137         util_strscpy(to, len, type);
 138         return type_num;
 139 }
 140
 141 static void set_scsi_type(char *to, const char *from, size_t len)
 142 {
 143         int type_num;
 144         char *eptr;
 145         char *type = "generic";
 146
 147         type_num = strtoul(from, &eptr, 0);
 148         if (eptr != from) {
 149                 switch (type_num) {
 150                 case 0:
 151                 case 0xe:
 152                         type = "disk";
 153                         break;
 154                 case 1:
 155                         type = "tape";
 156                         break;
 157                 case 4:
 158                 case 7:
 159                 case 0xf:
 160                         type = "optical";
 161                         break;
 162                 case 5:
 163                         type = "cd";
 164                         break;
 165                 default:
 166                         break;
 167                 }
 168         }
 169         util_strscpy(to, len, type);
 170 }
 171
 172 #define USB_DT_DEVICE                   0x01
 173 #define USB_DT_INTERFACE                0x04
 174
 175 static int dev_if_packed_info(struct udev_device *dev, char *ifs_str, size_t len)
 176 {
 177         char *filename = NULL;
 178         int fd;
 179         ssize_t size;
 180         unsigned char buf[18 + 65535];
 181         unsigned int pos, strpos;
 182         struct usb_interface_descriptor {
 183                 u_int8_t        bLength;
 184                 u_int8_t        bDescriptorType;
 185                 u_int8_t        bInterfaceNumber;
 186                 u_int8_t        bAlternateSetting;
 187                 u_int8_t        bNumEndpoints;
 188                 u_int8_t        bInterfaceClass;
 189                 u_int8_t        bInterfaceSubClass;
 190                 u_int8_t        bInterfaceProtocol;
 191                 u_int8_t        iInterface;
 192         } __attribute__((packed));
 193         int err = 0;
 194
 195         if (asprintf(&filename, "%s/descriptors", udev_device_get_syspath(dev)) < 0) {
 196                 err = -1;
 197                 goto out;
 198         }
 199         fd = open(filename, O_RDONLY);
 200         if (fd < 0) {
 201                 fprintf(stderr, "error opening USB device 'descriptors' file\n");
 202                 err = -1;
 203                 goto out;
 204         }
 205         size = read(fd, buf, sizeof(buf));
 206         close(fd);
 207         if (size < 18 || size == sizeof(buf)) {
 208                 err = -1;
 209                 goto out;
 210         }
 211
 212         pos = 0;
 213         strpos = 0;
 214         while (pos < sizeof(buf) && strpos+7 < len) {
 215                 struct usb_interface_descriptor *desc;
 216                 char if_str[8];
 217
 218                 desc = (struct usb_interface_descriptor *) &buf[pos];
 219                 if (desc->bLength < 3)
 220                         break;
 221                 pos += desc->bLength;
 222
 223                 if (desc->bDescriptorType != USB_DT_INTERFACE)
 224                         continue;
 225
 226                 if (snprintf(if_str, 8, "%02x%02x%02x:",
 227                              desc->bInterfaceClass,
 228                              desc->bInterfaceSubClass,
 229                              desc->bInterfaceProtocol) != 7)
 230                         continue;
 231
 232                 if (strstr(ifs_str, if_str) != NULL)
 233                         continue;
 234
 235                 memcpy(&ifs_str[strpos], if_str, 8),
 236                 strpos += 7;
 237         }
 238 out:
 239         free(filename);
 240         return err;
 241 }
 242
 243 /*
 244  * A unique USB identification is generated like this:
 245  *
 246  * 1.) Get the USB device type from InterfaceClass and InterfaceSubClass
 247  * 2.) If the device type is 'Mass-Storage/SPC-2' or 'Mass-Storage/RBC'
 248  *     use the SCSI vendor and model as USB-Vendor and USB-model.
 249  * 3.) Otherwise use the USB manufacturer and product as
 250  *     USB-Vendor and USB-model. Any non-printable characters
 251  *     in those strings will be skipped; a slash '/' will be converted
 252  *     into a full stop '.'.
 253  * 4.) If that fails, too, we will use idVendor and idProduct
 254  *     as USB-Vendor and USB-model.
 255  * 5.) The USB identification is the USB-vendor and USB-model
 256  *     string concatenated with an underscore '_'.
 257  * 6.) If the device supplies a serial number, this number
 258  *     is concatenated with the identification with an underscore '_'.
 259  */
 260 static int usb_id(struct udev_device *dev)
 261 {
 262         struct udev *udev = udev_device_get_udev(dev);
 263         struct udev_device *dev_interface = NULL;
 264         struct udev_device *dev_usb = NULL;
 265         const char *if_class, *if_subclass;
 266         int if_class_num;
 267         int protocol = 0;
 268
 269         dbg(udev, "syspath %s\n", udev_device_get_syspath(dev));
 270
 271         /* shortcut, if we are called directly for a "usb_device" type */
 272         if (udev_device_get_devtype(dev) != NULL && strcmp(udev_device_get_devtype(dev), "usb_device") == 0) {
 273                 dev_if_packed_info(dev, packed_if_str, sizeof(packed_if_str));
 274                 dev_usb = dev;
 275                 goto fallback;
 276         }
 277
 278         /* usb interface directory */
 279         dev_interface = udev_device_get_parent_with_subsystem_devtype(dev, "usb", "usb_interface");
 280         if (dev_interface == NULL) {
 281                 info(udev, "unable to access usb_interface device of '%s'\n",
 282                      udev_device_get_syspath(dev));
 283                 return 1;
 284         }
 285
 286         ifnum = udev_device_get_sysattr_value(dev_interface, "bInterfaceNumber");
 287         driver = udev_device_get_sysattr_value(dev_interface, "driver");
 288
 289         if_class = udev_device_get_sysattr_value(dev_interface, "bInterfaceClass");
 290         if (!if_class) {
 291                 info(udev, "%s: cannot get bInterfaceClass attribute\n",
 292                      udev_device_get_sysname(dev));
 293                 return 1;
 294         }
 295
 296         if_class_num = strtoul(if_class, NULL, 16);
 297         if (if_class_num == 8) {
 298                 /* mass storage */
 299                 if_subclass = udev_device_get_sysattr_value(dev_interface, "bInterfaceSubClass");
 300                 if (if_subclass != NULL)
 301                         protocol = set_usb_mass_storage_ifsubtype(type_str, if_subclass, sizeof(type_str)-1);
 302         } else {
 303                 set_usb_iftype(type_str, if_class_num, sizeof(type_str)-1);
 304         }
 305
 306         info(udev, "%s: if_class %d protocol %d\n",
 307              udev_device_get_syspath(dev_interface), if_class_num, protocol);
 308
 309         /* usb device directory */
 310         dev_usb = udev_device_get_parent_with_subsystem_devtype(dev_interface, "usb", "usb_device");
 311         if (!dev_usb) {
 312                 info(udev, "unable to find parent 'usb' device of '%s'\n",
 313                      udev_device_get_syspath(dev));
 314                 return 1;
 315         }
 316
 317         /* all interfaces of the device in a single string */
 318         dev_if_packed_info(dev_usb, packed_if_str, sizeof(packed_if_str));
 319
 320         /* mass storage : SCSI or ATAPI */
 321         if ((protocol == 6 || protocol == 2) && !use_usb_info) {
 322                 struct udev_device *dev_scsi;
 323                 const char *scsi_model, *scsi_vendor, *scsi_type, *scsi_rev;
 324                 int host, bus, target, lun;
 325
 326                 /* get scsi device */
 327                 dev_scsi = udev_device_get_parent_with_subsystem_devtype(dev, "scsi", "scsi_device");
 328                 if (dev_scsi == NULL) {
 329                         info(udev, "unable to find parent 'scsi' device of '%s'\n",
 330                              udev_device_get_syspath(dev));
 331                         goto fallback;
 332                 }
 333                 if (sscanf(udev_device_get_sysname(dev_scsi), "%d:%d:%d:%d", &host, &bus, &target, &lun) != 4) {
 334                         info(udev, "invalid scsi device '%s'\n", udev_device_get_sysname(dev_scsi));
 335                         goto fallback;
 336                 }
 337
 338                 /* Generic SPC-2 device */
 339                 scsi_vendor = udev_device_get_sysattr_value(dev_scsi, "vendor");
 340                 if (!scsi_vendor) {
 341                         info(udev, "%s: cannot get SCSI vendor attribute\n",
 342                              udev_device_get_sysname(dev_scsi));
 343                         goto fallback;
 344                 }
 345                 udev_util_encode_string(scsi_vendor, vendor_str_enc, sizeof(vendor_str_enc));
 346                 udev_util_replace_whitespace(scsi_vendor, vendor_str, sizeof(vendor_str)-1);
 347                 udev_util_replace_chars(vendor_str, NULL);
 348
 349                 scsi_model = udev_device_get_sysattr_value(dev_scsi, "model");
 350                 if (!scsi_model) {
 351                         info(udev, "%s: cannot get SCSI model attribute\n",
 352                              udev_device_get_sysname(dev_scsi));
 353                         goto fallback;
 354                 }
 355                 udev_util_encode_string(scsi_model, model_str_enc, sizeof(model_str_enc));
 356                 udev_util_replace_whitespace(scsi_model, model_str, sizeof(model_str)-1);
 357                 udev_util_replace_chars(model_str, NULL);
 358
 359                 scsi_type = udev_device_get_sysattr_value(dev_scsi, "type");
 360                 if (!scsi_type) {
 361                         info(udev, "%s: cannot get SCSI type attribute\n",
 362                              udev_device_get_sysname(dev_scsi));
 363                         goto fallback;
 364                 }
 365                 set_scsi_type(type_str, scsi_type, sizeof(type_str)-1);
 366
 367                 scsi_rev = udev_device_get_sysattr_value(dev_scsi, "rev");
 368                 if (!scsi_rev) {
 369                         info(udev, "%s: cannot get SCSI revision attribute\n",
 370                              udev_device_get_sysname(dev_scsi));
 371                         goto fallback;
 372                 }
 373                 udev_util_replace_whitespace(scsi_rev, revision_str, sizeof(revision_str)-1);
 374                 udev_util_replace_chars(revision_str, NULL);
 375
 376                 /*
 377                  * some broken devices have the same identifiers
 378                  * for all luns, export the target:lun number
 379                  */
 380                 sprintf(instance_str, "%d:%d", target, lun);
 381         }
 382
 383 fallback:
 384         vendor_id = udev_device_get_sysattr_value(dev_usb, "idVendor");
 385         product_id = udev_device_get_sysattr_value(dev_usb, "idProduct");
 386
 387         /* fallback to USB vendor & device */
 388         if (vendor_str[0] == '\0') {
 389                 const char *usb_vendor = NULL;
 390
 391                 if (!use_num_info)
 392                         usb_vendor = udev_device_get_sysattr_value(dev_usb, "manufacturer");
 393
 394                 if (!usb_vendor)
 395                         usb_vendor = vendor_id;
 396
 397                 if (!usb_vendor) {
 398                         info(udev, "No USB vendor information available\n");
 399                         return 1;
 400                 }
 401                 udev_util_encode_string(usb_vendor, vendor_str_enc, sizeof(vendor_str_enc));
 402                 udev_util_replace_whitespace(usb_vendor, vendor_str, sizeof(vendor_str)-1);
 403                 udev_util_replace_chars(vendor_str, NULL);
 404         }
 405
 406         if (model_str[0] == '\0') {
 407                 const char *usb_model = NULL;
 408
 409                 if (!use_num_info)
 410                         usb_model = udev_device_get_sysattr_value(dev_usb, "product");
 411
 412                 if (!usb_model)
 413                         usb_model = product_id;
 414
 415                 if (!usb_model) {
 416                         dbg(udev, "No USB model information available\n");
 417                         return 1;
 418                 }
 419                 udev_util_encode_string(usb_model, model_str_enc, sizeof(model_str_enc));
 420                 udev_util_replace_whitespace(usb_model, model_str, sizeof(model_str)-1);
 421                 udev_util_replace_chars(model_str, NULL);
 422         }
 423
 424         if (revision_str[0] == '\0') {
 425                 const char *usb_rev;
 426
 427                 usb_rev = udev_device_get_sysattr_value(dev_usb, "bcdDevice");
 428                 if (usb_rev) {
 429                         udev_util_replace_whitespace(usb_rev, revision_str, sizeof(revision_str)-1);
 430                         udev_util_replace_chars(revision_str, NULL);
 431                 }
 432         }
 433
 434         if (serial_str[0] == '\0') {
 435                 const char *usb_serial;
 436
 437                 usb_serial = udev_device_get_sysattr_value(dev_usb, "serial");
 438                 if (usb_serial) {
 439                         udev_util_replace_whitespace(usb_serial, serial_str, sizeof(serial_str)-1);
 440                         udev_util_replace_chars(serial_str, NULL);
 441                 }
 442         }
 443         return 0;
 444 }
 445
 446 int main(int argc, char **argv)
 447 {
 448         static const struct option options[] = {
 449                 { "usb-info", no_argument, NULL, 'u' },
 450                 { "num-info", no_argument, NULL, 'n' },
 451                 { "export", no_argument, NULL, 'x' },
 452                 { "debug", no_argument, NULL, 'd' },
 453                 { "help", no_argument, NULL, 'h' },
 454                 {}
 455         };
 456         struct udev *udev;
 457         struct udev_device *dev = NULL;
 458         char syspath[UTIL_PATH_SIZE];
 459         const char *devpath;
 460         static int export;
 461         int retval = 0;
 462
 463         udev = udev_new();
 464         if (udev == NULL)
 465                 goto exit;
 466
 467         logging_init("usb_id");
 468         udev_set_log_fn(udev, log_fn);
 469
 470         while (1) {
 471                 int option;
 472
 473                 option = getopt_long(argc, argv, "dnuxh", options, NULL);
 474                 if (option == -1)
 475                         break;
 476
 477                 switch (option) {
 478                 case 'd':
 479                         debug = 1;
 480                         if (udev_get_log_priority(udev) < LOG_INFO)
 481                                 udev_set_log_priority(udev, LOG_INFO);
 482                         break;
 483                 case 'n':
 484                         use_num_info = 1;
 485                         use_usb_info = 1;
 486                         break;
 487                 case 'u':
 488                         use_usb_info = 1;
 489                         break;
 490                 case 'x':
 491                         export = 1;
 492                         break;
 493                 case 'h':
 494                         printf("Usage: usb_id [--usb-info] [--num-info] [--export] [--help] <devpath>\n"
 495                                "  --usb-info  use usb strings instead\n"
 496                                "  --num-info  use numerical values\n"
 497                                "  --export    print values as environment keys\n"
 498                                "  --help      print this help text\n\n");
 499                 default:
 500                         retval = 1;
 501                         goto exit;
 502                 }
 503         }
 504
 505         devpath = argv[optind];
 506         if (devpath == NULL) {
 507                 fprintf(stderr, "No device specified\n");
 508                 retval = 1;
 509                 goto exit;
 510         }
 511
 512         util_strscpyl(syspath, sizeof(syspath), udev_get_sys_path(udev), devpath, NULL);
 513         dev = udev_device_new_from_syspath(udev, syspath);
 514         if (dev == NULL) {
 515                 err(udev, "unable to access '%s'\n", devpath);
 516                 return 1;
 517         }
 518
 519         retval = usb_id(dev);
 520         if (retval == 0) {
 521                 char serial[256];
 522                 size_t l;
 523                 char *s;
 524
 525                 s = serial;
 526                 l = util_strpcpyl(&s, sizeof(serial), vendor_str, "_", model_str, NULL);
 527                 if (serial_str[0] != '\0')
 528                         l = util_strpcpyl(&s, l, "_", serial_str, NULL);
 529                 if (instance_str[0] != '\0')
 530                         util_strpcpyl(&s, l, "-", instance_str, NULL);
 531
 532                 if (export) {
 533                         printf("ID_VENDOR=%s\n", vendor_str);
 534                         printf("ID_VENDOR_ENC=%s\n", vendor_str_enc);
 535                         printf("ID_VENDOR_ID=%s\n", vendor_id);
 536                         printf("ID_MODEL=%s\n", model_str);
 537                         printf("ID_MODEL_ENC=%s\n", model_str_enc);
 538                         printf("ID_MODEL_ID=%s\n", product_id);
 539                         printf("ID_REVISION=%s\n", revision_str);
 540                         printf("ID_SERIAL=%s\n", serial);
 541                         if (serial_str[0] != '\0')
 542                                 printf("ID_SERIAL_SHORT=%s\n", serial_str);
 543                         if (type_str[0] != '\0')
 544                                 printf("ID_TYPE=%s\n", type_str);
 545                         if (instance_str[0] != '\0')
 546                                 printf("ID_INSTANCE=%s\n", instance_str);
 547                         printf("ID_BUS=usb\n");
 548                         if (packed_if_str[0] != '\0')
 549                                 printf("ID_USB_INTERFACES=:%s\n", packed_if_str);
 550                         if (ifnum != NULL)
 551                                 printf("ID_USB_INTERFACE_NUM=%s\n", ifnum);
 552                         if (driver != NULL)
 553                                 printf("ID_USB_DRIVER=%s\n", driver);
 554                 } else
 555                         printf("%s\n", serial);
 556         }
 557
 558 exit:
 559         udev_device_unref(dev);
 560         udev_unref(udev);
 561         logging_close();
 562         return retval;
 563 }