src/udev/udev-builtin-usb_id.c

   1 /* SPDX-License-Identifier: GPL-2.0+ */
   2 /*
   3  * USB device properties and persistent device path
   4  *
   5  * Copyright (c) 2005 SUSE Linux Products GmbH, Germany
   6  *   Author: Hannes Reinecke <hare@suse.de>
   7  */
   8
   9 #include <ctype.h>
  10 #include <errno.h>
  11 #include <fcntl.h>
  12 #include <stdarg.h>
  13 #include <stdio.h>
  14 #include <stdlib.h>
  15 #include <string.h>
  16 #include <unistd.h>
  17
  18 #include "alloc-util.h"
  19 #include "device-util.h"
  20 #include "fd-util.h"
  21 #include "libudev-private.h"
  22 #include "string-util.h"
  23 #include "udev-builtin.h"
  24
  25 static void set_usb_iftype(char *to, int if_class_num, size_t len) {
  26         const char *type = "generic";
  27
  28         switch (if_class_num) {
  29         case 1:
  30                 type = "audio";
  31                 break;
  32         case 2: /* CDC-Control */
  33                 break;
  34         case 3:
  35                 type = "hid";
  36                 break;
  37         case 5: /* Physical */
  38                 break;
  39         case 6:
  40                 type = "media";
  41                 break;
  42         case 7:
  43                 type = "printer";
  44                 break;
  45         case 8:
  46                 type = "storage";
  47                 break;
  48         case 9:
  49                 type = "hub";
  50                 break;
  51         case 0x0a: /* CDC-Data */
  52                 break;
  53         case 0x0b: /* Chip/Smart Card */
  54                 break;
  55         case 0x0d: /* Content Security */
  56                 break;
  57         case 0x0e:
  58                 type = "video";
  59                 break;
  60         case 0xdc: /* Diagnostic Device */
  61                 break;
  62         case 0xe0: /* Wireless Controller */
  63                 break;
  64         case 0xfe: /* Application-specific */
  65                 break;
  66         case 0xff: /* Vendor-specific */
  67                 break;
  68         default:
  69                 break;
  70         }
  71         strncpy(to, type, len);
  72         to[len-1] = '\0';
  73 }
  74
  75 static int set_usb_mass_storage_ifsubtype(char *to, const char *from, size_t len) {
  76         int type_num = 0;
  77         char *eptr;
  78         const char *type = "generic";
  79
  80         type_num = strtoul(from, &eptr, 0);
  81         if (eptr != from) {
  82                 switch (type_num) {
  83                 case 1: /* RBC devices */
  84                         type = "rbc";
  85                         break;
  86                 case 2:
  87                         type = "atapi";
  88                         break;
  89                 case 3:
  90                         type = "tape";
  91                         break;
  92                 case 4: /* UFI */
  93                         type = "floppy";
  94                         break;
  95                 case 6: /* Transparent SPC-2 devices */
  96                         type = "scsi";
  97                         break;
  98                 default:
  99                         break;
 100                 }
 101         }
 102         strscpy(to, len, type);
 103         return type_num;
 104 }
 105
 106 static void set_scsi_type(char *to, const char *from, size_t len) {
 107         int type_num;
 108         char *eptr;
 109         const char *type = "generic";
 110
 111         type_num = strtoul(from, &eptr, 0);
 112         if (eptr != from) {
 113                 switch (type_num) {
 114                 case 0:
 115                 case 0xe:
 116                         type = "disk";
 117                         break;
 118                 case 1:
 119                         type = "tape";
 120                         break;
 121                 case 4:
 122                 case 7:
 123                 case 0xf:
 124                         type = "optical";
 125                         break;
 126                 case 5:
 127                         type = "cd";
 128                         break;
 129                 default:
 130                         break;
 131                 }
 132         }
 133         strscpy(to, len, type);
 134 }
 135
 136 #define USB_DT_DEVICE                        0x01
 137 #define USB_DT_INTERFACE                0x04
 138
 139 static int dev_if_packed_info(sd_device *dev, char *ifs_str, size_t len) {
 140         _cleanup_free_ char *filename = NULL;
 141         _cleanup_close_ int fd = -1;
 142         ssize_t size;
 143         unsigned char buf[18 + 65535];
 144         size_t pos = 0;
 145         unsigned strpos = 0;
 146         const char *syspath;
 147         int r;
 148         struct usb_interface_descriptor {
 149                 uint8_t bLength;
 150                 uint8_t bDescriptorType;
 151                 uint8_t bInterfaceNumber;
 152                 uint8_t bAlternateSetting;
 153                 uint8_t bNumEndpoints;
 154                 uint8_t bInterfaceClass;
 155                 uint8_t bInterfaceSubClass;
 156                 uint8_t bInterfaceProtocol;
 157                 uint8_t iInterface;
 158         } _packed_;
 159
 160         r = sd_device_get_syspath(dev, &syspath);
 161         if (r < 0)
 162                 return r;
 163         if (asprintf(&filename, "%s/descriptors", syspath) < 0)
 164                 return log_oom();
 165
 166         fd = open(filename, O_RDONLY|O_CLOEXEC);
 167         if (fd < 0)
 168                 return log_device_debug_errno(dev, errno, "Failed to open USB device 'descriptors' file: %m");
 169
 170         size = read(fd, buf, sizeof(buf));
 171         if (size < 18 || (size_t) size >= sizeof(buf))
 172                 return -EIO;
 173
 174         ifs_str[0] = '\0';
 175         while (pos + sizeof(struct usb_interface_descriptor) < (size_t) size &&
 176                strpos + 7 < len - 2) {
 177
 178                 struct usb_interface_descriptor *desc;
 179                 char if_str[8];
 180
 181                 desc = (struct usb_interface_descriptor *) &buf[pos];
 182                 if (desc->bLength < 3)
 183                         break;
 184                 pos += desc->bLength;
 185
 186                 if (desc->bDescriptorType != USB_DT_INTERFACE)
 187                         continue;
 188
 189                 if (snprintf(if_str, 8, ":%02x%02x%02x",
 190                              desc->bInterfaceClass,
 191                              desc->bInterfaceSubClass,
 192                              desc->bInterfaceProtocol) != 7)
 193                         continue;
 194
 195                 if (strstr(ifs_str, if_str) != NULL)
 196                         continue;
 197
 198                 memcpy(&ifs_str[strpos], if_str, 8),
 199                 strpos += 7;
 200         }
 201
 202         if (strpos > 0) {
 203                 ifs_str[strpos++] = ':';
 204                 ifs_str[strpos++] = '\0';
 205         }
 206
 207         return 0;
 208 }
 209
 210 /*
 211  * A unique USB identification is generated like this:
 212  *
 213  * 1.) Get the USB device type from InterfaceClass and InterfaceSubClass
 214  * 2.) If the device type is 'Mass-Storage/SPC-2' or 'Mass-Storage/RBC',
 215  *     use the SCSI vendor and model as USB-Vendor and USB-model.
 216  * 3.) Otherwise, use the USB manufacturer and product as
 217  *     USB-Vendor and USB-model. Any non-printable characters
 218  *     in those strings will be skipped; a slash '/' will be converted
 219  *     into a full stop '.'.
 220  * 4.) If that fails, too, we will use idVendor and idProduct
 221  *     as USB-Vendor and USB-model.
 222  * 5.) The USB identification is the USB-vendor and USB-model
 223  *     string concatenated with an underscore '_'.
 224  * 6.) If the device supplies a serial number, this number
 225  *     is concatenated with the identification with an underscore '_'.
 226  */
 227 static int builtin_usb_id(sd_device *dev, int argc, char *argv[], bool test) {
 228         char vendor_str[64] = "";
 229         char vendor_str_enc[256];
 230         const char *vendor_id;
 231         char model_str[64] = "";
 232         char model_str_enc[256];
 233         const char *product_id;
 234         char serial_str[UTIL_NAME_SIZE] = "";
 235         char packed_if_str[UTIL_NAME_SIZE] = "";
 236         char revision_str[64] = "";
 237         char type_str[64] = "";
 238         char instance_str[64] = "";
 239         const char *ifnum = NULL;
 240         const char *driver = NULL;
 241         char serial[256];
 242
 243         sd_device *dev_interface, *dev_usb;
 244         const char *if_class, *if_subclass;
 245         int if_class_num;
 246         int protocol = 0;
 247         size_t l;
 248         char *s;
 249
 250         const char *syspath, *sysname, *devtype, *interface_syspath;
 251         int r;
 252
 253         assert(dev);
 254
 255         r = sd_device_get_syspath(dev, &syspath);
 256         if (r < 0)
 257                 return r;
 258
 259         r = sd_device_get_sysname(dev, &sysname);
 260         if (r < 0)
 261                 return r;
 262
 263         /* shortcut, if we are called directly for a "usb_device" type */
 264         if (sd_device_get_devtype(dev, &devtype) >= 0 && streq(devtype, "usb_device")) {
 265                 dev_if_packed_info(dev, packed_if_str, sizeof(packed_if_str));
 266                 dev_usb = dev;
 267                 goto fallback;
 268         }
 269
 270         /* usb interface directory */
 271         r = sd_device_get_parent_with_subsystem_devtype(dev, "usb", "usb_interface", &dev_interface);
 272         if (r < 0)
 273                 return log_device_debug_errno(dev, r, "Failed to access usb_interface: %m");
 274
 275         r = sd_device_get_syspath(dev_interface, &interface_syspath);
 276         if (r < 0)
 277                 return log_device_debug_errno(dev_interface, r, "Failed to get syspath: %m");
 278         (void) sd_device_get_sysattr_value(dev_interface, "bInterfaceNumber", &ifnum);
 279         (void) sd_device_get_sysattr_value(dev_interface, "driver", &driver);
 280
 281         r = sd_device_get_sysattr_value(dev_interface, "bInterfaceClass", &if_class);
 282         if (r < 0)
 283                 return log_device_debug_errno(dev_interface, r, "Failed to get bInterfaceClass attribute: %m");
 284
 285         if_class_num = strtoul(if_class, NULL, 16);
 286         if (if_class_num == 8) {
 287                 /* mass storage */
 288                 if (sd_device_get_sysattr_value(dev_interface, "bInterfaceSubClass", &if_subclass) >= 0)
 289                         protocol = set_usb_mass_storage_ifsubtype(type_str, if_subclass, sizeof(type_str)-1);
 290         } else
 291                 set_usb_iftype(type_str, if_class_num, sizeof(type_str)-1);
 292
 293         log_device_debug(dev_interface, "if_class:%d protocol:%d", if_class_num, protocol);
 294
 295         /* usb device directory */
 296         r = sd_device_get_parent_with_subsystem_devtype(dev_interface, "usb", "usb_device", &dev_usb);
 297         if (r < 0)
 298                 return log_device_debug_errno(dev_interface, r, "Failed to find parent 'usb' device");
 299
 300         /* all interfaces of the device in a single string */
 301         dev_if_packed_info(dev_usb, packed_if_str, sizeof(packed_if_str));
 302
 303         /* mass storage : SCSI or ATAPI */
 304         if (IN_SET(protocol, 6, 2)) {
 305                 sd_device *dev_scsi;
 306                 const char *scsi_sysname, *scsi_model, *scsi_vendor, *scsi_type, *scsi_rev;
 307                 int host, bus, target, lun;
 308
 309                 /* get scsi device */
 310                 r = sd_device_get_parent_with_subsystem_devtype(dev, "scsi", "scsi_device", &dev_scsi);
 311                 if (r < 0) {
 312                         log_device_debug_errno(dev, r, "Unable to find parent SCSI device");
 313                         goto fallback;
 314                 }
 315                 if (sd_device_get_sysname(dev_scsi, &scsi_sysname) < 0)
 316                         goto fallback;
 317                 if (sscanf(scsi_sysname, "%d:%d:%d:%d", &host, &bus, &target, &lun) != 4) {
 318                         log_device_debug(dev_scsi, "Invalid SCSI device");
 319                         goto fallback;
 320                 }
 321
 322                 /* Generic SPC-2 device */
 323                 r = sd_device_get_sysattr_value(dev_scsi, "vendor", &scsi_vendor);
 324                 if (r < 0) {
 325                         log_device_debug_errno(dev_scsi, r, "Failed to get SCSI vendor attribute: %m");
 326                         goto fallback;
 327                 }
 328                 udev_util_encode_string(scsi_vendor, vendor_str_enc, sizeof(vendor_str_enc));
 329                 util_replace_whitespace(scsi_vendor, vendor_str, sizeof(vendor_str)-1);
 330                 util_replace_chars(vendor_str, NULL);
 331
 332                 r = sd_device_get_sysattr_value(dev_scsi, "model", &scsi_model);
 333                 if (r < 0) {
 334                         log_device_debug_errno(dev_scsi, r, "Failed to get SCSI model attribute: %m");
 335                         goto fallback;
 336                 }
 337                 udev_util_encode_string(scsi_model, model_str_enc, sizeof(model_str_enc));
 338                 util_replace_whitespace(scsi_model, model_str, sizeof(model_str)-1);
 339                 util_replace_chars(model_str, NULL);
 340
 341                 r = sd_device_get_sysattr_value(dev_scsi, "type", &scsi_type);
 342                 if (r < 0) {
 343                         log_device_debug_errno(dev_scsi, r, "Failed to get SCSI type attribute: %m");
 344                         goto fallback;
 345                 }
 346                 set_scsi_type(type_str, scsi_type, sizeof(type_str)-1);
 347
 348                 r = sd_device_get_sysattr_value(dev_scsi, "rev", &scsi_rev);
 349                 if (r < 0) {
 350                         log_device_debug_errno(dev_scsi, r, "Failed to get SCSI revision attribute: %m");
 351                         goto fallback;
 352                 }
 353                 util_replace_whitespace(scsi_rev, revision_str, sizeof(revision_str)-1);
 354                 util_replace_chars(revision_str, NULL);
 355
 356                 /*
 357                  * some broken devices have the same identifiers
 358                  * for all luns, export the target:lun number
 359                  */
 360                 sprintf(instance_str, "%d:%d", target, lun);
 361         }
 362
 363 fallback:
 364         r = sd_device_get_sysattr_value(dev_usb, "idVendor", &vendor_id);
 365         if (r < 0)
 366                 return log_device_debug_errno(dev_usb, r, "Failed to get idVendor attribute: %m");
 367
 368         r = sd_device_get_sysattr_value(dev_usb, "idProduct", &product_id);
 369         if (r < 0)
 370                 return log_device_debug_errno(dev_usb, r, "Failed to get idProduct attribute: %m");
 371
 372         /* fallback to USB vendor & device */
 373         if (vendor_str[0] == '\0') {
 374                 const char *usb_vendor;
 375
 376                 if (sd_device_get_sysattr_value(dev_usb, "manufacturer", &usb_vendor) < 0)
 377                         usb_vendor = vendor_id;
 378                 udev_util_encode_string(usb_vendor, vendor_str_enc, sizeof(vendor_str_enc));
 379                 util_replace_whitespace(usb_vendor, vendor_str, sizeof(vendor_str)-1);
 380                 util_replace_chars(vendor_str, NULL);
 381         }
 382
 383         if (model_str[0] == '\0') {
 384                 const char *usb_model;
 385
 386                 if (sd_device_get_sysattr_value(dev_usb, "product", &usb_model) < 0)
 387                         usb_model = product_id;
 388                 udev_util_encode_string(usb_model, model_str_enc, sizeof(model_str_enc));
 389                 util_replace_whitespace(usb_model, model_str, sizeof(model_str)-1);
 390                 util_replace_chars(model_str, NULL);
 391         }
 392
 393         if (revision_str[0] == '\0') {
 394                 const char *usb_rev;
 395
 396                 if (sd_device_get_sysattr_value(dev_usb, "bcdDevice", &usb_rev) >= 0) {
 397                         util_replace_whitespace(usb_rev, revision_str, sizeof(revision_str)-1);
 398                         util_replace_chars(revision_str, NULL);
 399                 }
 400         }
 401
 402         if (serial_str[0] == '\0') {
 403                 const char *usb_serial;
 404
 405                 if (sd_device_get_sysattr_value(dev_usb, "serial", &usb_serial) >= 0) {
 406                         const unsigned char *p;
 407
 408                         /* http://msdn.microsoft.com/en-us/library/windows/hardware/gg487321.aspx */
 409                         for (p = (unsigned char *) usb_serial; *p != '\0'; p++)
 410                                 if (*p < 0x20 || *p > 0x7f || *p == ',') {
 411                                         usb_serial = NULL;
 412                                         break;
 413                                 }
 414
 415                         if (usb_serial) {
 416                                 util_replace_whitespace(usb_serial, serial_str, sizeof(serial_str)-1);
 417                                 util_replace_chars(serial_str, NULL);
 418                         }
 419                 }
 420         }
 421
 422         s = serial;
 423         l = strpcpyl(&s, sizeof(serial), vendor_str, "_", model_str, NULL);
 424         if (!isempty(serial_str))
 425                 l = strpcpyl(&s, l, "_", serial_str, NULL);
 426
 427         if (!isempty(instance_str))
 428                 strpcpyl(&s, l, "-", instance_str, NULL);
 429
 430         udev_builtin_add_property(dev, test, "ID_VENDOR", vendor_str);
 431         udev_builtin_add_property(dev, test, "ID_VENDOR_ENC", vendor_str_enc);
 432         udev_builtin_add_property(dev, test, "ID_VENDOR_ID", vendor_id);
 433         udev_builtin_add_property(dev, test, "ID_MODEL", model_str);
 434         udev_builtin_add_property(dev, test, "ID_MODEL_ENC", model_str_enc);
 435         udev_builtin_add_property(dev, test, "ID_MODEL_ID", product_id);
 436         udev_builtin_add_property(dev, test, "ID_REVISION", revision_str);
 437         udev_builtin_add_property(dev, test, "ID_SERIAL", serial);
 438         if (!isempty(serial_str))
 439                 udev_builtin_add_property(dev, test, "ID_SERIAL_SHORT", serial_str);
 440         if (!isempty(type_str))
 441                 udev_builtin_add_property(dev, test, "ID_TYPE", type_str);
 442         if (!isempty(instance_str))
 443                 udev_builtin_add_property(dev, test, "ID_INSTANCE", instance_str);
 444         udev_builtin_add_property(dev, test, "ID_BUS", "usb");
 445         if (!isempty(packed_if_str))
 446                 udev_builtin_add_property(dev, test, "ID_USB_INTERFACES", packed_if_str);
 447         if (ifnum)
 448                 udev_builtin_add_property(dev, test, "ID_USB_INTERFACE_NUM", ifnum);
 449         if (driver)
 450                 udev_builtin_add_property(dev, test, "ID_USB_DRIVER", driver);
 451         return 0;
 452 }
 453
 454 const struct udev_builtin udev_builtin_usb_id = {
 455         .name = "usb_id",
 456         .cmd = builtin_usb_id,
 457         .help = "USB device properties",
 458         .run_once = true,
 459 };