udev/udev-builtin-usb_id.c

   1 /*
   2  * USB device properties and persistent device path
   3  *
   4  * Copyright (c) 2005 SUSE Linux Products GmbH, Germany
   5  *   Author: Hannes Reinecke <hare@suse.de>
   6  *
   7  * Copyright (C) 2005-2011 Kay Sievers <kay.sievers@vrfy.org>
   8  *
   9  * This program is free software: you can redistribute it and/or modify
  10  * it under the terms of the GNU General Public License as published by
  11  * the Free Software Foundation, either version 2 of the License, or
  12  * (at your option) any later version.
  13  *
  14  * This program is distributed in the hope that it will be useful,
  15  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  16  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  17  * GNU General Public License for more details.
  18  *
  19  * You should have received a copy of the GNU General Public License
  20  * along with this program.  If not, see <http://www.gnu.org/licenses/>.
  21  */
  22
  23 #include <stdio.h>
  24 #include <stdlib.h>
  25 #include <stdarg.h>
  26 #include <unistd.h>
  27 #include <string.h>
  28 #include <ctype.h>
  29 #include <fcntl.h>
  30 #include <errno.h>
  31
  32 #include "udev.h"
  33
  34 static void set_usb_iftype(char *to, int if_class_num, size_t len)
  35 {
  36         char *type = "generic";
  37
  38         switch (if_class_num) {
  39         case 1:
  40                 type = "audio";
  41                 break;
  42         case 2: /* CDC-Control */
  43                 break;
  44         case 3:
  45                 type = "hid";
  46                 break;
  47         case 5: /* Physical */
  48                 break;
  49         case 6:
  50                 type = "media";
  51                 break;
  52         case 7:
  53                 type = "printer";
  54                 break;
  55         case 8:
  56                 type = "storage";
  57                 break;
  58         case 9:
  59                 type = "hub";
  60                 break;
  61         case 0x0a: /* CDC-Data */
  62                 break;
  63         case 0x0b: /* Chip/Smart Card */
  64                 break;
  65         case 0x0d: /* Content Security */
  66                 break;
  67         case 0x0e:
  68                 type = "video";
  69                 break;
  70         case 0xdc: /* Diagnostic Device */
  71                 break;
  72         case 0xe0: /* Wireless Controller */
  73                 break;
  74         case 0xfe: /* Application-specific */
  75                 break;
  76         case 0xff: /* Vendor-specific */
  77                 break;
  78         default:
  79                 break;
  80         }
  81         strncpy(to, type, len);
  82         to[len-1] = '\0';
  83 }
  84
  85 static int set_usb_mass_storage_ifsubtype(char *to, const char *from, size_t len)
  86 {
  87         int type_num = 0;
  88         char *eptr;
  89         char *type = "generic";
  90
  91         type_num = strtoul(from, &eptr, 0);
  92         if (eptr != from) {
  93                 switch (type_num) {
  94                 case 2:
  95                         type = "atapi";
  96                         break;
  97                 case 3:
  98                         type = "tape";
  99                         break;
 100                 case 4: /* UFI */
 101                 case 5: /* SFF-8070i */
 102                         type = "floppy";
 103                         break;
 104                 case 1: /* RBC devices */
 105                         type = "rbc";
 106                         break;
 107                 case 6: /* Transparent SPC-2 devices */
 108                         type = "scsi";
 109                         break;
 110                 default:
 111                         break;
 112                 }
 113         }
 114         util_strscpy(to, len, type);
 115         return type_num;
 116 }
 117
 118 static void set_scsi_type(char *to, const char *from, size_t len)
 119 {
 120         int type_num;
 121         char *eptr;
 122         char *type = "generic";
 123
 124         type_num = strtoul(from, &eptr, 0);
 125         if (eptr != from) {
 126                 switch (type_num) {
 127                 case 0:
 128                 case 0xe:
 129                         type = "disk";
 130                         break;
 131                 case 1:
 132                         type = "tape";
 133                         break;
 134                 case 4:
 135                 case 7:
 136                 case 0xf:
 137                         type = "optical";
 138                         break;
 139                 case 5:
 140                         type = "cd";
 141                         break;
 142                 default:
 143                         break;
 144                 }
 145         }
 146         util_strscpy(to, len, type);
 147 }
 148
 149 #define USB_DT_DEVICE                   0x01
 150 #define USB_DT_INTERFACE                0x04
 151
 152 static int dev_if_packed_info(struct udev_device *dev, char *ifs_str, size_t len)
 153 {
 154         char *filename = NULL;
 155         int fd;
 156         ssize_t size;
 157         unsigned char buf[18 + 65535];
 158         unsigned int pos, strpos;
 159         struct usb_interface_descriptor {
 160                 u_int8_t        bLength;
 161                 u_int8_t        bDescriptorType;
 162                 u_int8_t        bInterfaceNumber;
 163                 u_int8_t        bAlternateSetting;
 164                 u_int8_t        bNumEndpoints;
 165                 u_int8_t        bInterfaceClass;
 166                 u_int8_t        bInterfaceSubClass;
 167                 u_int8_t        bInterfaceProtocol;
 168                 u_int8_t        iInterface;
 169         } __attribute__((packed));
 170         int err = 0;
 171
 172         if (asprintf(&filename, "%s/descriptors", udev_device_get_syspath(dev)) < 0) {
 173                 err = -1;
 174                 goto out;
 175         }
 176         fd = open(filename, O_RDONLY|O_CLOEXEC);
 177         if (fd < 0) {
 178                 fprintf(stderr, "error opening USB device 'descriptors' file\n");
 179                 err = -1;
 180                 goto out;
 181         }
 182         size = read(fd, buf, sizeof(buf));
 183         close(fd);
 184         if (size < 18 || size == sizeof(buf)) {
 185                 err = -1;
 186                 goto out;
 187         }
 188
 189         pos = 0;
 190         strpos = 0;
 191         ifs_str[0] = '\0';
 192         while (pos < sizeof(buf) && strpos+7 < len-2) {
 193                 struct usb_interface_descriptor *desc;
 194                 char if_str[8];
 195
 196                 desc = (struct usb_interface_descriptor *) &buf[pos];
 197                 if (desc->bLength < 3)
 198                         break;
 199                 pos += desc->bLength;
 200
 201                 if (desc->bDescriptorType != USB_DT_INTERFACE)
 202                         continue;
 203
 204                 if (snprintf(if_str, 8, ":%02x%02x%02x",
 205                              desc->bInterfaceClass,
 206                              desc->bInterfaceSubClass,
 207                              desc->bInterfaceProtocol) != 7)
 208                         continue;
 209
 210                 if (strstr(ifs_str, if_str) != NULL)
 211                         continue;
 212
 213                 memcpy(&ifs_str[strpos], if_str, 8),
 214                 strpos += 7;
 215         }
 216         if (strpos > 0) {
 217                 ifs_str[strpos++] = ':';
 218                 ifs_str[strpos++] = '\0';
 219         }
 220 out:
 221         free(filename);
 222         return err;
 223 }
 224
 225 /*
 226  * A unique USB identification is generated like this:
 227  *
 228  * 1.) Get the USB device type from InterfaceClass and InterfaceSubClass
 229  * 2.) If the device type is 'Mass-Storage/SPC-2' or 'Mass-Storage/RBC'
 230  *     use the SCSI vendor and model as USB-Vendor and USB-model.
 231  * 3.) Otherwise use the USB manufacturer and product as
 232  *     USB-Vendor and USB-model. Any non-printable characters
 233  *     in those strings will be skipped; a slash '/' will be converted
 234  *     into a full stop '.'.
 235  * 4.) If that fails, too, we will use idVendor and idProduct
 236  *     as USB-Vendor and USB-model.
 237  * 5.) The USB identification is the USB-vendor and USB-model
 238  *     string concatenated with an underscore '_'.
 239  * 6.) If the device supplies a serial number, this number
 240  *     is concatenated with the identification with an underscore '_'.
 241  */
 242 static int builtin_usb_id(struct udev_device *dev, int argc, char *argv[], bool test)
 243 {
 244         char vendor_str[64];
 245         char vendor_str_enc[256];
 246         const char *vendor_id;
 247         char model_str[64];
 248         char model_str_enc[256];
 249         const char *product_id;
 250         char serial_str[UTIL_NAME_SIZE];
 251         char packed_if_str[UTIL_NAME_SIZE];
 252         char revision_str[64];
 253         char type_str[64];
 254         char instance_str[64];
 255         const char *ifnum = NULL;
 256         const char *driver = NULL;
 257         char serial[256];
 258
 259         struct udev *udev = udev_device_get_udev(dev);
 260         struct udev_device *dev_interface = NULL;
 261         struct udev_device *dev_usb = NULL;
 262         const char *if_class, *if_subclass;
 263         int if_class_num;
 264         int protocol = 0;
 265         size_t l;
 266         char *s;
 267
 268         vendor_str[0] = '\0';
 269         model_str[0] = '\0';
 270         serial_str[0] = '\0';
 271         packed_if_str[0] = '\0';
 272         revision_str[0] = '\0';
 273         type_str[0] = '\0';
 274         instance_str[0] = '\0';
 275
 276         dbg(udev, "syspath %s\n", udev_device_get_syspath(dev));
 277
 278         /* shortcut, if we are called directly for a "usb_device" type */
 279         if (udev_device_get_devtype(dev) != NULL && strcmp(udev_device_get_devtype(dev), "usb_device") == 0) {
 280                 dev_if_packed_info(dev, packed_if_str, sizeof(packed_if_str));
 281                 dev_usb = dev;
 282                 goto fallback;
 283         }
 284
 285         /* usb interface directory */
 286         dev_interface = udev_device_get_parent_with_subsystem_devtype(dev, "usb", "usb_interface");
 287         if (dev_interface == NULL) {
 288                 info(udev, "unable to access usb_interface device of '%s'\n",
 289                      udev_device_get_syspath(dev));
 290                 return EXIT_FAILURE;
 291         }
 292
 293         ifnum = udev_device_get_sysattr_value(dev_interface, "bInterfaceNumber");
 294         driver = udev_device_get_sysattr_value(dev_interface, "driver");
 295
 296         if_class = udev_device_get_sysattr_value(dev_interface, "bInterfaceClass");
 297         if (!if_class) {
 298                 info(udev, "%s: cannot get bInterfaceClass attribute\n",
 299                      udev_device_get_sysname(dev));
 300                 return EXIT_FAILURE;
 301         }
 302
 303         if_class_num = strtoul(if_class, NULL, 16);
 304         if (if_class_num == 8) {
 305                 /* mass storage */
 306                 if_subclass = udev_device_get_sysattr_value(dev_interface, "bInterfaceSubClass");
 307                 if (if_subclass != NULL)
 308                         protocol = set_usb_mass_storage_ifsubtype(type_str, if_subclass, sizeof(type_str)-1);
 309         } else {
 310                 set_usb_iftype(type_str, if_class_num, sizeof(type_str)-1);
 311         }
 312
 313         info(udev, "%s: if_class %d protocol %d\n",
 314              udev_device_get_syspath(dev_interface), if_class_num, protocol);
 315
 316         /* usb device directory */
 317         dev_usb = udev_device_get_parent_with_subsystem_devtype(dev_interface, "usb", "usb_device");
 318         if (!dev_usb) {
 319                 info(udev, "unable to find parent 'usb' device of '%s'\n",
 320                      udev_device_get_syspath(dev));
 321                 return EXIT_FAILURE;
 322         }
 323
 324         /* all interfaces of the device in a single string */
 325         dev_if_packed_info(dev_usb, packed_if_str, sizeof(packed_if_str));
 326
 327         /* mass storage : SCSI or ATAPI */
 328         if ((protocol == 6 || protocol == 2)) {
 329                 struct udev_device *dev_scsi;
 330                 const char *scsi_model, *scsi_vendor, *scsi_type, *scsi_rev;
 331                 int host, bus, target, lun;
 332
 333                 /* get scsi device */
 334                 dev_scsi = udev_device_get_parent_with_subsystem_devtype(dev, "scsi", "scsi_device");
 335                 if (dev_scsi == NULL) {
 336                         info(udev, "unable to find parent 'scsi' device of '%s'\n",
 337                              udev_device_get_syspath(dev));
 338                         goto fallback;
 339                 }
 340                 if (sscanf(udev_device_get_sysname(dev_scsi), "%d:%d:%d:%d", &host, &bus, &target, &lun) != 4) {
 341                         info(udev, "invalid scsi device '%s'\n", udev_device_get_sysname(dev_scsi));
 342                         goto fallback;
 343                 }
 344
 345                 /* Generic SPC-2 device */
 346                 scsi_vendor = udev_device_get_sysattr_value(dev_scsi, "vendor");
 347                 if (!scsi_vendor) {
 348                         info(udev, "%s: cannot get SCSI vendor attribute\n",
 349                              udev_device_get_sysname(dev_scsi));
 350                         goto fallback;
 351                 }
 352                 udev_util_encode_string(scsi_vendor, vendor_str_enc, sizeof(vendor_str_enc));
 353                 util_replace_whitespace(scsi_vendor, vendor_str, sizeof(vendor_str)-1);
 354                 util_replace_chars(vendor_str, NULL);
 355
 356                 scsi_model = udev_device_get_sysattr_value(dev_scsi, "model");
 357                 if (!scsi_model) {
 358                         info(udev, "%s: cannot get SCSI model attribute\n",
 359                              udev_device_get_sysname(dev_scsi));
 360                         goto fallback;
 361                 }
 362                 udev_util_encode_string(scsi_model, model_str_enc, sizeof(model_str_enc));
 363                 util_replace_whitespace(scsi_model, model_str, sizeof(model_str)-1);
 364                 util_replace_chars(model_str, NULL);
 365
 366                 scsi_type = udev_device_get_sysattr_value(dev_scsi, "type");
 367                 if (!scsi_type) {
 368                         info(udev, "%s: cannot get SCSI type attribute\n",
 369                              udev_device_get_sysname(dev_scsi));
 370                         goto fallback;
 371                 }
 372                 set_scsi_type(type_str, scsi_type, sizeof(type_str)-1);
 373
 374                 scsi_rev = udev_device_get_sysattr_value(dev_scsi, "rev");
 375                 if (!scsi_rev) {
 376                         info(udev, "%s: cannot get SCSI revision attribute\n",
 377                              udev_device_get_sysname(dev_scsi));
 378                         goto fallback;
 379                 }
 380                 util_replace_whitespace(scsi_rev, revision_str, sizeof(revision_str)-1);
 381                 util_replace_chars(revision_str, NULL);
 382
 383                 /*
 384                  * some broken devices have the same identifiers
 385                  * for all luns, export the target:lun number
 386                  */
 387                 sprintf(instance_str, "%d:%d", target, lun);
 388         }
 389
 390 fallback:
 391         vendor_id = udev_device_get_sysattr_value(dev_usb, "idVendor");
 392         product_id = udev_device_get_sysattr_value(dev_usb, "idProduct");
 393
 394         /* fallback to USB vendor & device */
 395         if (vendor_str[0] == '\0') {
 396                 const char *usb_vendor = NULL;
 397
 398                 usb_vendor = udev_device_get_sysattr_value(dev_usb, "manufacturer");
 399                 if (!usb_vendor)
 400                         usb_vendor = vendor_id;
 401                 if (!usb_vendor) {
 402                         info(udev, "No USB vendor information available\n");
 403                         return EXIT_FAILURE;
 404                 }
 405                 udev_util_encode_string(usb_vendor, vendor_str_enc, sizeof(vendor_str_enc));
 406                 util_replace_whitespace(usb_vendor, vendor_str, sizeof(vendor_str)-1);
 407                 util_replace_chars(vendor_str, NULL);
 408         }
 409
 410         if (model_str[0] == '\0') {
 411                 const char *usb_model = NULL;
 412
 413                 usb_model = udev_device_get_sysattr_value(dev_usb, "product");
 414                 if (!usb_model)
 415                         usb_model = product_id;
 416                 if (!usb_model) {
 417                         dbg(udev, "No USB model information available\n");
 418                         return EXIT_FAILURE;
 419                 }
 420                 udev_util_encode_string(usb_model, model_str_enc, sizeof(model_str_enc));
 421                 util_replace_whitespace(usb_model, model_str, sizeof(model_str)-1);
 422                 util_replace_chars(model_str, NULL);
 423         }
 424
 425         if (revision_str[0] == '\0') {
 426                 const char *usb_rev;
 427
 428                 usb_rev = udev_device_get_sysattr_value(dev_usb, "bcdDevice");
 429                 if (usb_rev) {
 430                         util_replace_whitespace(usb_rev, revision_str, sizeof(revision_str)-1);
 431                         util_replace_chars(revision_str, NULL);
 432                 }
 433         }
 434
 435         if (serial_str[0] == '\0') {
 436                 const char *usb_serial;
 437
 438                 usb_serial = udev_device_get_sysattr_value(dev_usb, "serial");
 439                 if (usb_serial) {
 440                         util_replace_whitespace(usb_serial, serial_str, sizeof(serial_str)-1);
 441                         util_replace_chars(serial_str, NULL);
 442                 }
 443         }
 444
 445         s = serial;
 446         l = util_strpcpyl(&s, sizeof(serial), vendor_str, "_", model_str, NULL);
 447         if (serial_str[0] != '\0')
 448                 l = util_strpcpyl(&s, l, "_", serial_str, NULL);
 449
 450         if (instance_str[0] != '\0')
 451                 util_strpcpyl(&s, l, "-", instance_str, NULL);
 452
 453         udev_builtin_add_property(dev, test, "ID_VENDOR", vendor_str);
 454         udev_builtin_add_property(dev, test, "ID_VENDOR_ENC", vendor_str_enc);
 455         udev_builtin_add_property(dev, test, "ID_VENDOR_ID", vendor_id);
 456         udev_builtin_add_property(dev, test, "ID_MODEL", model_str);
 457         udev_builtin_add_property(dev, test, "ID_MODEL_ENC", model_str_enc);
 458         udev_builtin_add_property(dev, test, "ID_MODEL_ID", product_id);
 459         udev_builtin_add_property(dev, test, "ID_REVISION", revision_str);
 460         udev_builtin_add_property(dev, test, "ID_SERIAL", serial);
 461         if (serial_str[0] != '\0')
 462                 udev_builtin_add_property(dev, test, "ID_SERIAL_SHORT", serial_str);
 463         if (type_str[0] != '\0')
 464                 udev_builtin_add_property(dev, test, "ID_TYPE", type_str);
 465         if (instance_str[0] != '\0')
 466                 udev_builtin_add_property(dev, test, "ID_INSTANCE", instance_str);
 467         udev_builtin_add_property(dev, test, "ID_BUS", "usb");
 468         if (packed_if_str[0] != '\0')
 469                 udev_builtin_add_property(dev, test, "ID_USB_INTERFACES", packed_if_str);
 470         if (ifnum != NULL)
 471                 udev_builtin_add_property(dev, test, "ID_USB_INTERFACE_NUM", ifnum);
 472         if (driver != NULL)
 473                 udev_builtin_add_property(dev, test, "ID_USB_DRIVER", driver);
 474         return EXIT_SUCCESS;
 475 }
 476
 477 const struct udev_builtin udev_builtin_usb_id = {
 478         .name = "usb_id",
 479         .cmd = builtin_usb_id,
 480         .help = "usb device properties",
 481         .run_once = true,
 482 };