src/udev/scsi_id/scsi_serial.c

   1 /*
   2  * Copyright (C) IBM Corp. 2003
   3  *
   4  * Author: Patrick Mansfield<patmans@us.ibm.com>
   5  *
   6  * This program is free software: you can redistribute it and/or modify
   7  * it under the terms of the GNU General Public License as published by
   8  * the Free Software Foundation, either version 2 of the License, or
   9  * (at your option) any later version.
  10  *
  11  * This program is distributed in the hope that it will be useful,
  12  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  13  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  14  * GNU General Public License for more details.
  15  *
  16  * You should have received a copy of the GNU General Public License
  17  * along with this program.  If not, see <http://www.gnu.org/licenses/>.
  18  */
  19
  20 #include <sys/types.h>
  21 #include <sys/ioctl.h>
  22 #include <sys/stat.h>
  23 #include <stdio.h>
  24 #include <errno.h>
  25 #include <string.h>
  26 #include <fcntl.h>
  27 #include <stdlib.h>
  28 #include <unistd.h>
  29 #include <time.h>
  30 #include <inttypes.h>
  31 #include <scsi/scsi.h>
  32 #include <scsi/sg.h>
  33 #include <linux/types.h>
  34 #include <linux/bsg.h>
  35
  36 #include "libudev.h"
  37 #include "libudev-private.h"
  38 #include "scsi.h"
  39 #include "scsi_id.h"
  40 #include "random-util.h"
  41
  42 /*
  43  * A priority based list of id, naa, and binary/ascii for the identifier
  44  * descriptor in VPD page 0x83.
  45  *
  46  * Brute force search for a match starting with the first value in the
  47  * following id_search_list. This is not a performance issue, since there
  48  * is normally one or some small number of descriptors.
  49  */
  50 static const struct scsi_id_search_values id_search_list[] = {
  51         { SCSI_ID_TGTGROUP,        SCSI_ID_NAA_DONT_CARE,        SCSI_ID_BINARY },
  52         { SCSI_ID_NAA,        SCSI_ID_NAA_IEEE_REG_EXTENDED,        SCSI_ID_BINARY },
  53         { SCSI_ID_NAA,        SCSI_ID_NAA_IEEE_REG_EXTENDED,        SCSI_ID_ASCII },
  54         { SCSI_ID_NAA,        SCSI_ID_NAA_IEEE_REG,        SCSI_ID_BINARY },
  55         { SCSI_ID_NAA,        SCSI_ID_NAA_IEEE_REG,        SCSI_ID_ASCII },
  56         /*
  57          * Devices already exist using NAA values that are now marked
  58          * reserved. These should not conflict with other values, or it is
  59          * a bug in the device. As long as we find the IEEE extended one
  60          * first, we really don't care what other ones are used. Using
  61          * don't care here means that a device that returns multiple
  62          * non-IEEE descriptors in a random order will get different
  63          * names.
  64          */
  65         { SCSI_ID_NAA,        SCSI_ID_NAA_DONT_CARE,        SCSI_ID_BINARY },
  66         { SCSI_ID_NAA,        SCSI_ID_NAA_DONT_CARE,        SCSI_ID_ASCII },
  67         { SCSI_ID_EUI_64,        SCSI_ID_NAA_DONT_CARE,        SCSI_ID_BINARY },
  68         { SCSI_ID_EUI_64,        SCSI_ID_NAA_DONT_CARE,        SCSI_ID_ASCII },
  69         { SCSI_ID_T10_VENDOR,        SCSI_ID_NAA_DONT_CARE,        SCSI_ID_BINARY },
  70         { SCSI_ID_T10_VENDOR,        SCSI_ID_NAA_DONT_CARE,        SCSI_ID_ASCII },
  71         { SCSI_ID_VENDOR_SPECIFIC,        SCSI_ID_NAA_DONT_CARE,        SCSI_ID_BINARY },
  72         { SCSI_ID_VENDOR_SPECIFIC,        SCSI_ID_NAA_DONT_CARE,        SCSI_ID_ASCII },
  73 };
  74
  75 static const char hex_str[]="0123456789abcdef";
  76
  77 /*
  78  * Values returned in the result/status, only the ones used by the code
  79  * are used here.
  80  */
  81
  82 #define DID_NO_CONNECT                        0x01        /* Unable to connect before timeout */
  83 #define DID_BUS_BUSY                        0x02        /* Bus remain busy until timeout */
  84 #define DID_TIME_OUT                        0x03        /* Timed out for some other reason */
  85 #define DRIVER_TIMEOUT                        0x06
  86 #define DRIVER_SENSE                        0x08        /* Sense_buffer has been set */
  87
  88 /* The following "category" function returns one of the following */
  89 #define SG_ERR_CAT_CLEAN                0        /* No errors or other information */
  90 #define SG_ERR_CAT_MEDIA_CHANGED        1        /* interpreted from sense buffer */
  91 #define SG_ERR_CAT_RESET                2        /* interpreted from sense buffer */
  92 #define SG_ERR_CAT_TIMEOUT                3
  93 #define SG_ERR_CAT_RECOVERED                4        /* Successful command after recovered err */
  94 #define SG_ERR_CAT_NOTSUPPORTED                5        /* Illegal / unsupported command */
  95 #define SG_ERR_CAT_SENSE                98        /* Something else in the sense buffer */
  96 #define SG_ERR_CAT_OTHER                99        /* Some other error/warning */
  97
  98 static int do_scsi_page80_inquiry(struct udev *udev,
  99                                   struct scsi_id_device *dev_scsi, int fd,
 100                                   char *serial, char *serial_short, int max_len);
 101
 102 static int sg_err_category_new(struct udev *udev,
 103                                int scsi_status, int msg_status, int
 104                                host_status, int driver_status, const
 105                                unsigned char *sense_buffer, int sb_len)
 106 {
 107         scsi_status &= 0x7e;
 108
 109         /*
 110          * XXX change to return only two values - failed or OK.
 111          */
 112
 113         if (!scsi_status && !host_status && !driver_status)
 114                 return SG_ERR_CAT_CLEAN;
 115
 116         if ((scsi_status == SCSI_CHECK_CONDITION) ||
 117             (scsi_status == SCSI_COMMAND_TERMINATED) ||
 118             ((driver_status & 0xf) == DRIVER_SENSE)) {
 119                 if (sense_buffer && (sb_len > 2)) {
 120                         int sense_key;
 121                         unsigned char asc;
 122
 123                         if (sense_buffer[0] & 0x2) {
 124                                 sense_key = sense_buffer[1] & 0xf;
 125                                 asc = sense_buffer[2];
 126                         } else {
 127                                 sense_key = sense_buffer[2] & 0xf;
 128                                 asc = (sb_len > 12) ? sense_buffer[12] : 0;
 129                         }
 130
 131                         if (sense_key == RECOVERED_ERROR)
 132                                 return SG_ERR_CAT_RECOVERED;
 133                         else if (sense_key == UNIT_ATTENTION) {
 134                                 if (0x28 == asc)
 135                                         return SG_ERR_CAT_MEDIA_CHANGED;
 136                                 if (0x29 == asc)
 137                                         return SG_ERR_CAT_RESET;
 138                         } else if (sense_key == ILLEGAL_REQUEST) {
 139                                 return SG_ERR_CAT_NOTSUPPORTED;
 140                         }
 141                 }
 142                 return SG_ERR_CAT_SENSE;
 143         }
 144         if (host_status) {
 145                 if ((host_status == DID_NO_CONNECT) ||
 146                     (host_status == DID_BUS_BUSY) ||
 147                     (host_status == DID_TIME_OUT))
 148                         return SG_ERR_CAT_TIMEOUT;
 149         }
 150         if (driver_status) {
 151                 if (driver_status == DRIVER_TIMEOUT)
 152                         return SG_ERR_CAT_TIMEOUT;
 153         }
 154         return SG_ERR_CAT_OTHER;
 155 }
 156
 157 static int sg_err_category3(struct udev *udev, struct sg_io_hdr *hp)
 158 {
 159         return sg_err_category_new(udev,
 160                                    hp->status, hp->msg_status,
 161                                    hp->host_status, hp->driver_status,
 162                                    hp->sbp, hp->sb_len_wr);
 163 }
 164
 165 static int sg_err_category4(struct udev *udev, struct sg_io_v4 *hp)
 166 {
 167         return sg_err_category_new(udev, hp->device_status, 0,
 168                                    hp->transport_status, hp->driver_status,
 169                                    (unsigned char *)(uintptr_t)hp->response,
 170                                    hp->response_len);
 171 }
 172
 173 static int scsi_dump_sense(struct udev *udev,
 174                            struct scsi_id_device *dev_scsi,
 175                            unsigned char *sense_buffer, int sb_len)
 176 {
 177         int s;
 178         int code;
 179         int sense_class;
 180         int sense_key;
 181         int asc, ascq;
 182 #ifdef DUMP_SENSE
 183         char out_buffer[256];
 184         int i, j;
 185 #endif
 186
 187         /*
 188          * Figure out and print the sense key, asc and ascq.
 189          *
 190          * If you want to suppress these for a particular drive model, add
 191          * a black list entry in the scsi_id config file.
 192          *
 193          * XXX We probably need to: lookup the sense/asc/ascq in a retry
 194          * table, and if found return 1 (after dumping the sense, asc, and
 195          * ascq). So, if/when we get something like a power on/reset,
 196          * we'll retry the command.
 197          */
 198
 199         if (sb_len < 1) {
 200                 log_debug("%s: sense buffer empty", dev_scsi->kernel);
 201                 return -1;
 202         }
 203
 204         sense_class = (sense_buffer[0] >> 4) & 0x07;
 205         code = sense_buffer[0] & 0xf;
 206
 207         if (sense_class == 7) {
 208                 /*
 209                  * extended sense data.
 210                  */
 211                 s = sense_buffer[7] + 8;
 212                 if (sb_len < s) {
 213                         log_debug("%s: sense buffer too small %d bytes, %d bytes too short",
 214                             dev_scsi->kernel, sb_len, s - sb_len);
 215                         return -1;
 216                 }
 217                 if ((code == 0x0) || (code == 0x1)) {
 218                         sense_key = sense_buffer[2] & 0xf;
 219                         if (s < 14) {
 220                                 /*
 221                                  * Possible?
 222                                  */
 223                                 log_debug("%s: sense result too" " small %d bytes",
 224                                     dev_scsi->kernel, s);
 225                                 return -1;
 226                         }
 227                         asc = sense_buffer[12];
 228                         ascq = sense_buffer[13];
 229                 } else if ((code == 0x2) || (code == 0x3)) {
 230                         sense_key = sense_buffer[1] & 0xf;
 231                         asc = sense_buffer[2];
 232                         ascq = sense_buffer[3];
 233                 } else {
 234                         log_debug("%s: invalid sense code 0x%x",
 235                             dev_scsi->kernel, code);
 236                         return -1;
 237                 }
 238                 log_debug("%s: sense key 0x%x ASC 0x%x ASCQ 0x%x",
 239                     dev_scsi->kernel, sense_key, asc, ascq);
 240         } else {
 241                 if (sb_len < 4) {
 242                         log_debug("%s: sense buffer too small %d bytes, %d bytes too short",
 243                             dev_scsi->kernel, sb_len, 4 - sb_len);
 244                         return -1;
 245                 }
 246
 247                 if (sense_buffer[0] < 15)
 248                         log_debug("%s: old sense key: 0x%x", dev_scsi->kernel, sense_buffer[0] & 0x0f);
 249                 else
 250                         log_debug("%s: sense = %2x %2x",
 251                             dev_scsi->kernel, sense_buffer[0], sense_buffer[2]);
 252                 log_debug("%s: non-extended sense class %d code 0x%0x",
 253                     dev_scsi->kernel, sense_class, code);
 254
 255         }
 256
 257 #ifdef DUMP_SENSE
 258         for (i = 0, j = 0; (i < s) && (j < 254); i++) {
 259                 out_buffer[j++] = hex_str[(sense_buffer[i] & 0xf0) >> 4];
 260                 out_buffer[j++] = hex_str[sense_buffer[i] & 0x0f];
 261                 out_buffer[j++] = ' ';
 262         }
 263         out_buffer[j] = '\0';
 264         log_debug("%s: sense dump:", dev_scsi->kernel);
 265         log_debug("%s: %s", dev_scsi->kernel, out_buffer);
 266
 267 #endif
 268         return -1;
 269 }
 270
 271 static int scsi_dump(struct udev *udev,
 272                      struct scsi_id_device *dev_scsi, struct sg_io_hdr *io)
 273 {
 274         if (!io->status && !io->host_status && !io->msg_status &&
 275             !io->driver_status) {
 276                 /*
 277                  * Impossible, should not be called.
 278                  */
 279                 log_debug("%s: called with no error", __FUNCTION__);
 280                 return -1;
 281         }
 282
 283         log_debug("%s: sg_io failed status 0x%x 0x%x 0x%x 0x%x",
 284             dev_scsi->kernel, io->driver_status, io->host_status, io->msg_status, io->status);
 285         if (io->status == SCSI_CHECK_CONDITION)
 286                 return scsi_dump_sense(udev, dev_scsi, io->sbp, io->sb_len_wr);
 287         else
 288                 return -1;
 289 }
 290
 291 static int scsi_dump_v4(struct udev *udev,
 292                         struct scsi_id_device *dev_scsi, struct sg_io_v4 *io)
 293 {
 294         if (!io->device_status && !io->transport_status &&
 295             !io->driver_status) {
 296                 /*
 297                  * Impossible, should not be called.
 298                  */
 299                 log_debug("%s: called with no error", __FUNCTION__);
 300                 return -1;
 301         }
 302
 303         log_debug("%s: sg_io failed status 0x%x 0x%x 0x%x",
 304             dev_scsi->kernel, io->driver_status, io->transport_status,
 305              io->device_status);
 306         if (io->device_status == SCSI_CHECK_CONDITION)
 307                 return scsi_dump_sense(udev, dev_scsi, (unsigned char *)(uintptr_t)io->response,
 308                                        io->response_len);
 309         else
 310                 return -1;
 311 }
 312
 313 static int scsi_inquiry(struct udev *udev,
 314                         struct scsi_id_device *dev_scsi, int fd,
 315                         unsigned char evpd, unsigned char page,
 316                         unsigned char *buf, unsigned int buflen)
 317 {
 318         unsigned char inq_cmd[INQUIRY_CMDLEN] =
 319                 { INQUIRY_CMD, evpd, page, 0, buflen, 0 };
 320         unsigned char sense[SENSE_BUFF_LEN];
 321         void *io_buf;
 322         struct sg_io_v4 io_v4;
 323         struct sg_io_hdr io_hdr;
 324         int retry = 3; /* rather random */
 325         int retval;
 326
 327         if (buflen > SCSI_INQ_BUFF_LEN) {
 328                 log_debug("buflen %d too long", buflen);
 329                 return -1;
 330         }
 331
 332 resend:
 333         if (dev_scsi->use_sg == 4) {
 334                 memzero(&io_v4, sizeof(struct sg_io_v4));
 335                 io_v4.guard = 'Q';
 336                 io_v4.protocol = BSG_PROTOCOL_SCSI;
 337                 io_v4.subprotocol = BSG_SUB_PROTOCOL_SCSI_CMD;
 338                 io_v4.request_len = sizeof(inq_cmd);
 339                 io_v4.request = (uintptr_t)inq_cmd;
 340                 io_v4.max_response_len = sizeof(sense);
 341                 io_v4.response = (uintptr_t)sense;
 342                 io_v4.din_xfer_len = buflen;
 343                 io_v4.din_xferp = (uintptr_t)buf;
 344                 io_buf = (void *)&io_v4;
 345         } else {
 346                 memzero(&io_hdr, sizeof(struct sg_io_hdr));
 347                 io_hdr.interface_id = 'S';
 348                 io_hdr.cmd_len = sizeof(inq_cmd);
 349                 io_hdr.mx_sb_len = sizeof(sense);
 350                 io_hdr.dxfer_direction = SG_DXFER_FROM_DEV;
 351                 io_hdr.dxfer_len = buflen;
 352                 io_hdr.dxferp = buf;
 353                 io_hdr.cmdp = inq_cmd;
 354                 io_hdr.sbp = sense;
 355                 io_hdr.timeout = DEF_TIMEOUT;
 356                 io_buf = (void *)&io_hdr;
 357         }
 358
 359         retval = ioctl(fd, SG_IO, io_buf);
 360         if (retval < 0) {
 361                 if ((errno == EINVAL || errno == ENOSYS) && dev_scsi->use_sg == 4) {
 362                         dev_scsi->use_sg = 3;
 363                         goto resend;
 364                 }
 365                 log_debug_errno(errno, "%s: ioctl failed: %m", dev_scsi->kernel);
 366                 goto error;
 367         }
 368
 369         if (dev_scsi->use_sg == 4)
 370                 retval = sg_err_category4(udev, io_buf);
 371         else
 372                 retval = sg_err_category3(udev, io_buf);
 373
 374         switch (retval) {
 375                 case SG_ERR_CAT_NOTSUPPORTED:
 376                         buf[1] = 0;
 377                         /* Fallthrough */
 378                 case SG_ERR_CAT_CLEAN:
 379                 case SG_ERR_CAT_RECOVERED:
 380                         retval = 0;
 381                         break;
 382
 383                 default:
 384                         if (dev_scsi->use_sg == 4)
 385                                 retval = scsi_dump_v4(udev, dev_scsi, io_buf);
 386                         else
 387                                 retval = scsi_dump(udev, dev_scsi, io_buf);
 388         }
 389
 390         if (!retval) {
 391                 retval = buflen;
 392         } else if (retval > 0) {
 393                 if (--retry > 0)
 394                         goto resend;
 395                 retval = -1;
 396         }
 397
 398 error:
 399         if (retval < 0)
 400                 log_debug("%s: Unable to get INQUIRY vpd %d page 0x%x.",
 401                     dev_scsi->kernel, evpd, page);
 402
 403         return retval;
 404 }
 405
 406 /* Get list of supported EVPD pages */
 407 static int do_scsi_page0_inquiry(struct udev *udev,
 408                                  struct scsi_id_device *dev_scsi, int fd,
 409                                  unsigned char *buffer, unsigned int len)
 410 {
 411         int retval;
 412
 413         memzero(buffer, len);
 414         retval = scsi_inquiry(udev, dev_scsi, fd, 1, 0x0, buffer, len);
 415         if (retval < 0)
 416                 return 1;
 417
 418         if (buffer[1] != 0) {
 419                 log_debug("%s: page 0 not available.", dev_scsi->kernel);
 420                 return 1;
 421         }
 422         if (buffer[3] > len) {
 423                 log_debug("%s: page 0 buffer too long %d", dev_scsi->kernel,         buffer[3]);
 424                 return 1;
 425         }
 426
 427         /*
 428          * Following check is based on code once included in the 2.5.x
 429          * kernel.
 430          *
 431          * Some ill behaved devices return the standard inquiry here
 432          * rather than the evpd data, snoop the data to verify.
 433          */
 434         if (buffer[3] > MODEL_LENGTH) {
 435                 /*
 436                  * If the vendor id appears in the page assume the page is
 437                  * invalid.
 438                  */
 439                 if (strneq((char *)&buffer[VENDOR_LENGTH], dev_scsi->vendor, VENDOR_LENGTH)) {
 440                         log_debug("%s: invalid page0 data", dev_scsi->kernel);
 441                         return 1;
 442                 }
 443         }
 444         return 0;
 445 }
 446
 447 /*
 448  * The caller checks that serial is long enough to include the vendor +
 449  * model.
 450  */
 451 static int prepend_vendor_model(struct udev *udev,
 452                                 struct scsi_id_device *dev_scsi, char *serial)
 453 {
 454         int ind;
 455
 456         strncpy(serial, dev_scsi->vendor, VENDOR_LENGTH);
 457         strncat(serial, dev_scsi->model, MODEL_LENGTH);
 458         ind = strlen(serial);
 459
 460         /*
 461          * This is not a complete check, since we are using strncat/cpy
 462          * above, ind will never be too large.
 463          */
 464         if (ind != (VENDOR_LENGTH + MODEL_LENGTH)) {
 465                 log_debug("%s: expected length %d, got length %d",
 466                      dev_scsi->kernel, (VENDOR_LENGTH + MODEL_LENGTH), ind);
 467                 return -1;
 468         }
 469         return ind;
 470 }
 471
 472 /*
 473  * check_fill_0x83_id - check the page 0x83 id, if OK allocate and fill
 474  * serial number.
 475  */
 476 static int check_fill_0x83_id(struct udev *udev,
 477                               struct scsi_id_device *dev_scsi,
 478                               unsigned char *page_83,
 479                               const struct scsi_id_search_values
 480                               *id_search, char *serial, char *serial_short,
 481                               int max_len, char *wwn,
 482                               char *wwn_vendor_extension, char *tgpt_group)
 483 {
 484         int i, j, s, len;
 485
 486         /*
 487          * ASSOCIATION must be with the device (value 0)
 488          * or with the target port for SCSI_ID_TGTPORT
 489          */
 490         if ((page_83[1] & 0x30) == 0x10) {
 491                 if (id_search->id_type != SCSI_ID_TGTGROUP)
 492                         return 1;
 493         } else if ((page_83[1] & 0x30) != 0) {
 494                 return 1;
 495         }
 496
 497         if ((page_83[1] & 0x0f) != id_search->id_type)
 498                 return 1;
 499
 500         /*
 501          * Possibly check NAA sub-type.
 502          */
 503         if ((id_search->naa_type != SCSI_ID_NAA_DONT_CARE) &&
 504             (id_search->naa_type != (page_83[4] & 0xf0) >> 4))
 505                 return 1;
 506
 507         /*
 508          * Check for matching code set - ASCII or BINARY.
 509          */
 510         if ((page_83[0] & 0x0f) != id_search->code_set)
 511                 return 1;
 512
 513         /*
 514          * page_83[3]: identifier length
 515          */
 516         len = page_83[3];
 517         if ((page_83[0] & 0x0f) != SCSI_ID_ASCII)
 518                 /*
 519                  * If not ASCII, use two bytes for each binary value.
 520                  */
 521                 len *= 2;
 522
 523         /*
 524          * Add one byte for the NUL termination, and one for the id_type.
 525          */
 526         len += 2;
 527         if (id_search->id_type == SCSI_ID_VENDOR_SPECIFIC)
 528                 len += VENDOR_LENGTH + MODEL_LENGTH;
 529
 530         if (max_len < len) {
 531                 log_debug("%s: length %d too short - need %d",
 532                     dev_scsi->kernel, max_len, len);
 533                 return 1;
 534         }
 535
 536         if (id_search->id_type == SCSI_ID_TGTGROUP && tgpt_group != NULL) {
 537                 unsigned int group;
 538
 539                 group = ((unsigned int)page_83[6] << 8) | page_83[7];
 540                 sprintf(tgpt_group,"%x", group);
 541                 return 1;
 542         }
 543
 544         serial[0] = hex_str[id_search->id_type];
 545
 546         /*
 547          * For SCSI_ID_VENDOR_SPECIFIC prepend the vendor and model before
 548          * the id since it is not unique across all vendors and models,
 549          * this differs from SCSI_ID_T10_VENDOR, where the vendor is
 550          * included in the identifier.
 551          */
 552         if (id_search->id_type == SCSI_ID_VENDOR_SPECIFIC)
 553                 if (prepend_vendor_model(udev, dev_scsi, &serial[1]) < 0)
 554                         return 1;
 555
 556         i = 4; /* offset to the start of the identifier */
 557         s = j = strlen(serial);
 558         if ((page_83[0] & 0x0f) == SCSI_ID_ASCII) {
 559                 /*
 560                  * ASCII descriptor.
 561                  */
 562                 while (i < (4 + page_83[3]))
 563                         serial[j++] = page_83[i++];
 564         } else {
 565                 /*
 566                  * Binary descriptor, convert to ASCII, using two bytes of
 567                  * ASCII for each byte in the page_83.
 568                  */
 569                 while (i < (4 + page_83[3])) {
 570                         serial[j++] = hex_str[(page_83[i] & 0xf0) >> 4];
 571                         serial[j++] = hex_str[page_83[i] & 0x0f];
 572                         i++;
 573                 }
 574         }
 575
 576         strcpy(serial_short, &serial[s]);
 577
 578         if (id_search->id_type == SCSI_ID_NAA && wwn != NULL) {
 579                 strncpy(wwn, &serial[s], 16);
 580                 if (wwn_vendor_extension != NULL) {
 581                         strncpy(wwn_vendor_extension, &serial[s + 16], 16);
 582                 }
 583         }
 584
 585         return 0;
 586 }
 587
 588 /* Extract the raw binary from VPD 0x83 pre-SPC devices */
 589 static int check_fill_0x83_prespc3(struct udev *udev,
 590                                    struct scsi_id_device *dev_scsi,
 591                                    unsigned char *page_83,
 592                                    const struct scsi_id_search_values
 593                                    *id_search, char *serial, char *serial_short, int max_len)
 594 {
 595         int i, j;
 596
 597         serial[0] = hex_str[id_search->id_type];
 598         /* serial has been memset to zero before */
 599         j = strlen(serial);        /* j = 1; */
 600
 601         for (i = 0; (i < page_83[3]) && (j < max_len-3); ++i) {
 602                 serial[j++] = hex_str[(page_83[4+i] & 0xf0) >> 4];
 603                 serial[j++] = hex_str[ page_83[4+i] & 0x0f];
 604         }
 605         serial[max_len-1] = 0;
 606         strncpy(serial_short, serial, max_len-1);
 607         return 0;
 608 }
 609
 610
 611 /* Get device identification VPD page */
 612 static int do_scsi_page83_inquiry(struct udev *udev,
 613                                   struct scsi_id_device *dev_scsi, int fd,
 614                                   char *serial, char *serial_short, int len,
 615                                   char *unit_serial_number, char *wwn,
 616                                   char *wwn_vendor_extension, char *tgpt_group)
 617 {
 618         int retval;
 619         unsigned int id_ind, j;
 620         unsigned char page_83[SCSI_INQ_BUFF_LEN];
 621
 622         /* also pick up the page 80 serial number */
 623         do_scsi_page80_inquiry(udev, dev_scsi, fd, NULL, unit_serial_number, MAX_SERIAL_LEN);
 624
 625         memzero(page_83, SCSI_INQ_BUFF_LEN);
 626         retval = scsi_inquiry(udev, dev_scsi, fd, 1, PAGE_83, page_83,
 627                               SCSI_INQ_BUFF_LEN);
 628         if (retval < 0)
 629                 return 1;
 630
 631         if (page_83[1] != PAGE_83) {
 632                 log_debug("%s: Invalid page 0x83", dev_scsi->kernel);
 633                 return 1;
 634         }
 635
 636         /*
 637          * XXX Some devices (IBM 3542) return all spaces for an identifier if
 638          * the LUN is not actually configured. This leads to identifiers of
 639          * the form: "1            ".
 640          */
 641
 642         /*
 643          * Model 4, 5, and (some) model 6 EMC Symmetrix devices return
 644          * a page 83 reply according to SCSI-2 format instead of SPC-2/3.
 645          *
 646          * The SCSI-2 page 83 format returns an IEEE WWN in binary
 647          * encoded hexi-decimal in the 16 bytes following the initial
 648          * 4-byte page 83 reply header.
 649          *
 650          * Both the SPC-2 and SPC-3 formats return an IEEE WWN as part
 651          * of an Identification descriptor.  The 3rd byte of the first
 652          * Identification descriptor is a reserved (BSZ) byte field.
 653          *
 654          * Reference the 7th byte of the page 83 reply to determine
 655          * whether the reply is compliant with SCSI-2 or SPC-2/3
 656          * specifications.  A zero value in the 7th byte indicates
 657          * an SPC-2/3 conformant reply, (i.e., the reserved field of the
 658          * first Identification descriptor).  This byte will be non-zero
 659          * for a SCSI-2 conformant page 83 reply from these EMC
 660          * Symmetrix models since the 7th byte of the reply corresponds
 661          * to the 4th and 5th nibbles of the 6-byte OUI for EMC, that is,
 662          * 0x006048.
 663          */
 664
 665         if (page_83[6] != 0)
 666                 return check_fill_0x83_prespc3(udev,
 667                                                dev_scsi, page_83, id_search_list,
 668                                                serial, serial_short, len);
 669
 670         /*
 671          * Search for a match in the prioritized id_search_list - since WWN ids
 672          * come first we can pick up the WWN in check_fill_0x83_id().
 673          */
 674         for (id_ind = 0;
 675              id_ind < sizeof(id_search_list)/sizeof(id_search_list[0]);
 676              id_ind++) {
 677                 /*
 678                  * Examine each descriptor returned. There is normally only
 679                  * one or a small number of descriptors.
 680                  */
 681                 for (j = 4; j <= (unsigned int)page_83[3] + 3; j += page_83[j + 3] + 4) {
 682                         retval = check_fill_0x83_id(udev,
 683                                                     dev_scsi, &page_83[j],
 684                                                     &id_search_list[id_ind],
 685                                                     serial, serial_short, len,
 686                                                     wwn, wwn_vendor_extension,
 687                                                     tgpt_group);
 688                         if (!retval)
 689                                 return retval;
 690                         else if (retval < 0)
 691                                 return retval;
 692                 }
 693         }
 694         return 1;
 695 }
 696
 697 /*
 698  * Get device identification VPD page for older SCSI-2 device which is not
 699  * compliant with either SPC-2 or SPC-3 format.
 700  *
 701  * Return the hard coded error code value 2 if the page 83 reply is not
 702  * conformant to the SCSI-2 format.
 703  */
 704 static int do_scsi_page83_prespc3_inquiry(struct udev *udev,
 705                                           struct scsi_id_device *dev_scsi, int fd,
 706                                           char *serial, char *serial_short, int len)
 707 {
 708         int retval;
 709         int i, j;
 710         unsigned char page_83[SCSI_INQ_BUFF_LEN];
 711
 712         memzero(page_83, SCSI_INQ_BUFF_LEN);
 713         retval = scsi_inquiry(udev, dev_scsi, fd, 1, PAGE_83, page_83, SCSI_INQ_BUFF_LEN);
 714         if (retval < 0)
 715                 return 1;
 716
 717         if (page_83[1] != PAGE_83) {
 718                 log_debug("%s: Invalid page 0x83", dev_scsi->kernel);
 719                 return 1;
 720         }
 721         /*
 722          * Model 4, 5, and (some) model 6 EMC Symmetrix devices return
 723          * a page 83 reply according to SCSI-2 format instead of SPC-2/3.
 724          *
 725          * The SCSI-2 page 83 format returns an IEEE WWN in binary
 726          * encoded hexi-decimal in the 16 bytes following the initial
 727          * 4-byte page 83 reply header.
 728          *
 729          * Both the SPC-2 and SPC-3 formats return an IEEE WWN as part
 730          * of an Identification descriptor.  The 3rd byte of the first
 731          * Identification descriptor is a reserved (BSZ) byte field.
 732          *
 733          * Reference the 7th byte of the page 83 reply to determine
 734          * whether the reply is compliant with SCSI-2 or SPC-2/3
 735          * specifications.  A zero value in the 7th byte indicates
 736          * an SPC-2/3 conformant reply, (i.e., the reserved field of the
 737          * first Identification descriptor).  This byte will be non-zero
 738          * for a SCSI-2 conformant page 83 reply from these EMC
 739          * Symmetrix models since the 7th byte of the reply corresponds
 740          * to the 4th and 5th nibbles of the 6-byte OUI for EMC, that is,
 741          * 0x006048.
 742          */
 743         if (page_83[6] == 0)
 744                 return 2;
 745
 746         serial[0] = hex_str[id_search_list[0].id_type];
 747         /*
 748          * The first four bytes contain data, not a descriptor.
 749          */
 750         i = 4;
 751         j = strlen(serial);
 752         /*
 753          * Binary descriptor, convert to ASCII,
 754          * using two bytes of ASCII for each byte
 755          * in the page_83.
 756          */
 757         while (i < (page_83[3]+4)) {
 758                 serial[j++] = hex_str[(page_83[i] & 0xf0) >> 4];
 759                 serial[j++] = hex_str[page_83[i] & 0x0f];
 760                 i++;
 761         }
 762         return 0;
 763 }
 764
 765 /* Get unit serial number VPD page */
 766 static int do_scsi_page80_inquiry(struct udev *udev,
 767                                   struct scsi_id_device *dev_scsi, int fd,
 768                                   char *serial, char *serial_short, int max_len)
 769 {
 770         int retval;
 771         int ser_ind;
 772         int i;
 773         int len;
 774         unsigned char buf[SCSI_INQ_BUFF_LEN];
 775
 776         memzero(buf, SCSI_INQ_BUFF_LEN);
 777         retval = scsi_inquiry(udev, dev_scsi, fd, 1, PAGE_80, buf, SCSI_INQ_BUFF_LEN);
 778         if (retval < 0)
 779                 return retval;
 780
 781         if (buf[1] != PAGE_80) {
 782                 log_debug("%s: Invalid page 0x80", dev_scsi->kernel);
 783                 return 1;
 784         }
 785
 786         len = 1 + VENDOR_LENGTH + MODEL_LENGTH + buf[3];
 787         if (max_len < len) {
 788                 log_debug("%s: length %d too short - need %d",
 789                      dev_scsi->kernel, max_len, len);
 790                 return 1;
 791         }
 792         /*
 793          * Prepend 'S' to avoid unlikely collision with page 0x83 vendor
 794          * specific type where we prepend '0' + vendor + model.
 795          */
 796         len = buf[3];
 797         if (serial != NULL) {
 798                 serial[0] = 'S';
 799                 ser_ind = prepend_vendor_model(udev, dev_scsi, &serial[1]);
 800                 if (ser_ind < 0)
 801                         return 1;
 802                 ser_ind++; /* for the leading 'S' */
 803                 for (i = 4; i < len + 4; i++, ser_ind++)
 804                         serial[ser_ind] = buf[i];
 805         }
 806         if (serial_short != NULL) {
 807                 memcpy(serial_short, &buf[4], len);
 808                 serial_short[len] = '\0';
 809         }
 810         return 0;
 811 }
 812
 813 int scsi_std_inquiry(struct udev *udev,
 814                      struct scsi_id_device *dev_scsi, const char *devname)
 815 {
 816         int fd;
 817         unsigned char buf[SCSI_INQ_BUFF_LEN];
 818         struct stat statbuf;
 819         int err = 0;
 820
 821         fd = open(devname, O_RDONLY | O_NONBLOCK | O_CLOEXEC);
 822         if (fd < 0) {
 823                 log_debug_errno(errno, "scsi_id: cannot open %s: %m", devname);
 824                 return 1;
 825         }
 826
 827         if (fstat(fd, &statbuf) < 0) {
 828                 log_debug_errno(errno, "scsi_id: cannot stat %s: %m", devname);
 829                 err = 2;
 830                 goto out;
 831         }
 832         sprintf(dev_scsi->kernel,"%d:%d", major(statbuf.st_rdev),
 833                 minor(statbuf.st_rdev));
 834
 835         memzero(buf, SCSI_INQ_BUFF_LEN);
 836         err = scsi_inquiry(udev, dev_scsi, fd, 0, 0, buf, SCSI_INQ_BUFF_LEN);
 837         if (err < 0)
 838                 goto out;
 839
 840         err = 0;
 841         memcpy(dev_scsi->vendor, buf + 8, 8);
 842         dev_scsi->vendor[8] = '\0';
 843         memcpy(dev_scsi->model, buf + 16, 16);
 844         dev_scsi->model[16] = '\0';
 845         memcpy(dev_scsi->revision, buf + 32, 4);
 846         dev_scsi->revision[4] = '\0';
 847         sprintf(dev_scsi->type,"%x", buf[0] & 0x1f);
 848
 849 out:
 850         close(fd);
 851         return err;
 852 }
 853
 854 int scsi_get_serial(struct udev *udev,
 855                     struct scsi_id_device *dev_scsi, const char *devname,
 856                     int page_code, int len)
 857 {
 858         unsigned char page0[SCSI_INQ_BUFF_LEN];
 859         int fd = -1;
 860         int cnt;
 861         int ind;
 862         int retval;
 863
 864         memzero(dev_scsi->serial, len);
 865         initialize_srand();
 866         for (cnt = 20; cnt > 0; cnt--) {
 867                 struct timespec duration;
 868
 869                 fd = open(devname, O_RDONLY | O_NONBLOCK | O_CLOEXEC);
 870                 if (fd >= 0 || errno != EBUSY)
 871                         break;
 872                 duration.tv_sec = 0;
 873                 duration.tv_nsec = (200 * 1000 * 1000) + (rand() % 100 * 1000 * 1000);
 874                 nanosleep(&duration, NULL);
 875         }
 876         if (fd < 0)
 877                 return 1;
 878
 879         if (page_code == PAGE_80) {
 880                 if (do_scsi_page80_inquiry(udev, dev_scsi, fd, dev_scsi->serial, dev_scsi->serial_short, len)) {
 881                         retval = 1;
 882                         goto completed;
 883                 } else  {
 884                         retval = 0;
 885                         goto completed;
 886                 }
 887         } else if (page_code == PAGE_83) {
 888                 if (do_scsi_page83_inquiry(udev, dev_scsi, fd, dev_scsi->serial, dev_scsi->serial_short, len, dev_scsi->unit_serial_number, dev_scsi->wwn, dev_scsi->wwn_vendor_extension, dev_scsi->tgpt_group)) {
 889                         retval = 1;
 890                         goto completed;
 891                 } else  {
 892                         retval = 0;
 893                         goto completed;
 894                 }
 895         } else if (page_code == PAGE_83_PRE_SPC3) {
 896                 retval = do_scsi_page83_prespc3_inquiry(udev, dev_scsi, fd, dev_scsi->serial, dev_scsi->serial_short, len);
 897                 if (retval) {
 898                         /*
 899                          * Fallback to servicing a SPC-2/3 compliant page 83
 900                          * inquiry if the page 83 reply format does not
 901                          * conform to pre-SPC3 expectations.
 902                          */
 903                         if (retval == 2) {
 904                                 if (do_scsi_page83_inquiry(udev, dev_scsi, fd, dev_scsi->serial, dev_scsi->serial_short, len, dev_scsi->unit_serial_number, dev_scsi->wwn, dev_scsi->wwn_vendor_extension, dev_scsi->tgpt_group)) {
 905                                         retval = 1;
 906                                         goto completed;
 907                                 } else  {
 908                                         retval = 0;
 909                                         goto completed;
 910                                 }
 911                         }
 912                         else {
 913                                 retval = 1;
 914                                 goto completed;
 915                         }
 916                 } else  {
 917                         retval = 0;
 918                         goto completed;
 919                 }
 920         } else if (page_code != 0x00) {
 921                 log_debug("%s: unsupported page code 0x%d", dev_scsi->kernel, page_code);
 922                 retval = 1;
 923                 goto completed;
 924         }
 925
 926         /*
 927          * Get page 0, the page of the pages. By default, try from best to
 928          * worst of supported pages: 0x83 then 0x80.
 929          */
 930         if (do_scsi_page0_inquiry(udev, dev_scsi, fd, page0, SCSI_INQ_BUFF_LEN)) {
 931                 /*
 932                  * Don't try anything else. Black list if a specific page
 933                  * should be used for this vendor+model, or maybe have an
 934                  * optional fall-back to page 0x80 or page 0x83.
 935                  */
 936                 retval = 1;
 937                 goto completed;
 938         }
 939
 940         for (ind = 4; ind <= page0[3] + 3; ind++)
 941                 if (page0[ind] == PAGE_83)
 942                         if (!do_scsi_page83_inquiry(udev, dev_scsi, fd,
 943                                                     dev_scsi->serial, dev_scsi->serial_short, len, dev_scsi->unit_serial_number, dev_scsi->wwn, dev_scsi->wwn_vendor_extension, dev_scsi->tgpt_group)) {
 944                                 /*
 945                                  * Success
 946                                  */
 947                                 retval = 0;
 948                                 goto completed;
 949                         }
 950
 951         for (ind = 4; ind <= page0[3] + 3; ind++)
 952                 if (page0[ind] == PAGE_80)
 953                         if (!do_scsi_page80_inquiry(udev, dev_scsi, fd,
 954                                                     dev_scsi->serial, dev_scsi->serial_short, len)) {
 955                                 /*
 956                                  * Success
 957                                  */
 958                                 retval = 0;
 959                                 goto completed;
 960                         }
 961         retval = 1;
 962
 963 completed:
 964         close(fd);
 965         return retval;
 966 }