extras/cdrom_id/cdrom_id.c

   1 /*
   2  * cdrom_id - optical drive and media information prober
   3  *
   4  * Copyright (C) 2008-2010 Kay Sievers <kay.sievers@vrfy.org>
   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 #ifndef _GNU_SOURCE
  21 #define _GNU_SOURCE 1
  22 #endif
  23
  24 #include <stdio.h>
  25 #include <stddef.h>
  26 #include <stdlib.h>
  27 #include <unistd.h>
  28 #include <string.h>
  29 #include <limits.h>
  30 #include <fcntl.h>
  31 #include <errno.h>
  32 #include <getopt.h>
  33 #include <time.h>
  34 #include <scsi/sg.h>
  35 #include <sys/types.h>
  36 #include <sys/stat.h>
  37 #include <sys/time.h>
  38 #include <sys/ioctl.h>
  39 #include <linux/cdrom.h>
  40
  41 #include "libudev.h"
  42 #include "libudev-private.h"
  43
  44 static int debug;
  45
  46 static void log_fn(struct udev *udev, int priority,
  47                    const char *file, int line, const char *fn,
  48                    const char *format, va_list args)
  49 {
  50         if (debug) {
  51                 fprintf(stderr, "%s: ", fn);
  52                 vfprintf(stderr, format, args);
  53         } else {
  54                 vsyslog(priority, format, args);
  55         }
  56 }
  57
  58 /* device info */
  59 static unsigned int cd_cd_rom = 0;
  60 static unsigned int cd_cd_r = 0;
  61 static unsigned int cd_cd_rw = 0;
  62 static unsigned int cd_dvd_rom = 0;
  63 static unsigned int cd_dvd_r = 0;
  64 static unsigned int cd_dvd_rw = 0;
  65 static unsigned int cd_dvd_ram = 0;
  66 static unsigned int cd_dvd_plus_r = 0;
  67 static unsigned int cd_dvd_plus_rw = 0;
  68 static unsigned int cd_dvd_plus_r_dl = 0;
  69 static unsigned int cd_dvd_plus_rw_dl = 0;
  70 static unsigned int cd_bd = 0;
  71 static unsigned int cd_bd_r = 0;
  72 static unsigned int cd_bd_re = 0;
  73 static unsigned int cd_hddvd = 0;
  74 static unsigned int cd_hddvd_r = 0;
  75 static unsigned int cd_hddvd_rw = 0;
  76 static unsigned int cd_mo = 0;
  77 static unsigned int cd_mrw = 0;
  78 static unsigned int cd_mrw_w = 0;
  79
  80 /* media info */
  81 static unsigned int cd_media = 0;
  82 static unsigned int cd_media_cd_rom = 0;
  83 static unsigned int cd_media_cd_r = 0;
  84 static unsigned int cd_media_cd_rw = 0;
  85 static unsigned int cd_media_dvd_rom = 0;
  86 static unsigned int cd_media_dvd_r = 0;
  87 static unsigned int cd_media_dvd_rw = 0;
  88 static unsigned int cd_media_dvd_rw_ro = 0; /* restricted overwrite mode */
  89 static unsigned int cd_media_dvd_rw_seq = 0; /* sequential mode */
  90 static unsigned int cd_media_dvd_ram = 0;
  91 static unsigned int cd_media_dvd_plus_r = 0;
  92 static unsigned int cd_media_dvd_plus_rw = 0;
  93 static unsigned int cd_media_dvd_plus_r_dl = 0;
  94 static unsigned int cd_media_dvd_plus_rw_dl = 0;
  95 static unsigned int cd_media_bd = 0;
  96 static unsigned int cd_media_bd_r = 0;
  97 static unsigned int cd_media_bd_re = 0;
  98 static unsigned int cd_media_hddvd = 0;
  99 static unsigned int cd_media_hddvd_r = 0;
 100 static unsigned int cd_media_hddvd_rw = 0;
 101 static unsigned int cd_media_mo = 0;
 102 static unsigned int cd_media_mrw = 0;
 103 static unsigned int cd_media_mrw_w = 0;
 104
 105 static const char *cd_media_state = NULL;
 106 static unsigned int cd_media_session_next = 0;
 107 static unsigned int cd_media_session_count = 0;
 108 static unsigned int cd_media_track_count = 0;
 109 static unsigned int cd_media_track_count_data = 0;
 110 static unsigned int cd_media_track_count_audio = 0;
 111 static unsigned long long int cd_media_session_last_offset = 0;
 112
 113 #define ERRCODE(s)      ((((s)[2] & 0x0F) << 16) | ((s)[12] << 8) | ((s)[13]))
 114 #define SK(errcode)     (((errcode) >> 16) & 0xF)
 115 #define ASC(errcode)    (((errcode) >> 8) & 0xFF)
 116 #define ASCQ(errcode)   ((errcode) & 0xFF)
 117
 118 static int is_mounted(const char *device)
 119 {
 120         struct stat statbuf;
 121         FILE *fp;
 122         int maj, min;
 123         int mounted = 0;
 124
 125         if (stat(device, &statbuf) < 0)
 126                 return -ENODEV;
 127
 128         fp = fopen("/proc/self/mountinfo", "r");
 129         if (fp == NULL)
 130                 return -ENOSYS;
 131         while (fscanf(fp, "%*s %*s %i:%i %*[^\n]", &maj, &min) == 2) {
 132                 if (makedev(maj, min) == statbuf.st_rdev) {
 133                         mounted = 1;
 134                         break;
 135                 }
 136         }
 137         fclose(fp);
 138         return mounted;
 139 }
 140
 141 static void info_scsi_cmd_err(struct udev *udev, char *cmd, int err)
 142 {
 143         if (err == -1) {
 144                 info(udev, "%s failed\n", cmd);
 145                 return;
 146         }
 147         info(udev, "%s failed with SK=%Xh/ASC=%02Xh/ACQ=%02Xh\n", cmd, SK(err), ASC(err), ASCQ(err));
 148 }
 149
 150 struct scsi_cmd {
 151         struct cdrom_generic_command cgc;
 152         union {
 153                 struct request_sense s;
 154                 unsigned char u[18];
 155         } _sense;
 156         struct sg_io_hdr sg_io;
 157 };
 158
 159 static void scsi_cmd_init(struct udev *udev, struct scsi_cmd *cmd, unsigned char *buf, size_t bufsize)
 160 {
 161         memset(cmd, 0x00, sizeof(struct scsi_cmd));
 162         memset(buf, 0x00, bufsize);
 163         cmd->cgc.quiet = 1;
 164         cmd->cgc.sense = &cmd->_sense.s;
 165         memset(&cmd->sg_io, 0, sizeof(cmd->sg_io));
 166         cmd->sg_io.interface_id = 'S';
 167         cmd->sg_io.mx_sb_len = sizeof(cmd->_sense);
 168         cmd->sg_io.cmdp = cmd->cgc.cmd;
 169         cmd->sg_io.sbp = cmd->_sense.u;
 170         cmd->sg_io.flags = SG_FLAG_LUN_INHIBIT | SG_FLAG_DIRECT_IO;
 171 }
 172
 173 static void scsi_cmd_set(struct udev *udev, struct scsi_cmd *cmd, size_t i, unsigned char arg)
 174 {
 175         cmd->sg_io.cmd_len = i + 1;
 176         cmd->cgc.cmd[i] = arg;
 177 }
 178
 179 #define CHECK_CONDITION 0x01
 180
 181 static int scsi_cmd_run(struct udev *udev, struct scsi_cmd *cmd, int fd, unsigned char *buf, size_t bufsize)
 182 {
 183         int ret = 0;
 184
 185         cmd->sg_io.dxferp = buf;
 186         cmd->sg_io.dxfer_len = bufsize;
 187         cmd->sg_io.dxfer_direction = SG_DXFER_FROM_DEV;
 188         if (ioctl(fd, SG_IO, &cmd->sg_io))
 189                 return -1;
 190
 191         if ((cmd->sg_io.info & SG_INFO_OK_MASK) != SG_INFO_OK) {
 192                 errno = EIO;
 193                 ret = -1;
 194                 if (cmd->sg_io.masked_status & CHECK_CONDITION) {
 195                         ret = ERRCODE(cmd->_sense.u);
 196                         if (ret == 0)
 197                                 ret = -1;
 198                 }
 199         }
 200         return ret;
 201 }
 202
 203 static int cd_capability_compat(struct udev *udev, int fd)
 204 {
 205         int capability;
 206
 207         capability = ioctl(fd, CDROM_GET_CAPABILITY, NULL);
 208         if (capability < 0) {
 209                 info(udev, "CDROM_GET_CAPABILITY failed\n");
 210                 return -1;
 211         }
 212
 213         if (capability & CDC_CD_R)
 214                 cd_cd_r = 1;
 215         if (capability & CDC_CD_RW)
 216                 cd_cd_rw = 1;
 217         if (capability & CDC_DVD)
 218                 cd_dvd_rom = 1;
 219         if (capability & CDC_DVD_R)
 220                 cd_dvd_r = 1;
 221         if (capability & CDC_DVD_RAM)
 222                 cd_dvd_ram = 1;
 223         if (capability & CDC_MRW)
 224                 cd_mrw = 1;
 225         if (capability & CDC_MRW_W)
 226                 cd_mrw_w = 1;
 227         return 0;
 228 }
 229
 230 static int cd_media_compat(struct udev *udev, int fd)
 231 {
 232         if (ioctl(fd, CDROM_DRIVE_STATUS, CDSL_CURRENT) != CDS_DISC_OK) {
 233                 info(udev, "CDROM_DRIVE_STATUS != CDS_DISC_OK\n");
 234                 return -1;
 235         }
 236         cd_media = 1;
 237         return 0;
 238 }
 239
 240 static int cd_inquiry(struct udev *udev, int fd) {
 241         struct scsi_cmd sc;
 242         unsigned char inq[128];
 243         int err;
 244
 245         scsi_cmd_init(udev, &sc, inq, sizeof(inq));
 246         scsi_cmd_set(udev, &sc, 0, 0x12);
 247         scsi_cmd_set(udev, &sc, 4, 36);
 248         scsi_cmd_set(udev, &sc, 5, 0);
 249         err = scsi_cmd_run(udev, &sc, fd, inq, 36);
 250         if ((err != 0)) {
 251                 info_scsi_cmd_err(udev, "INQUIRY", err);
 252                 return -1;
 253         }
 254
 255         if ((inq[0] & 0x1F) != 5) {
 256                 info(udev, "not an MMC unit\n");
 257                 return -1;
 258         }
 259
 260         info(udev, "INQUIRY: [%.8s][%.16s][%.4s]\n", inq + 8, inq + 16, inq + 32);
 261         return 0;
 262 }
 263
 264 static int feature_profiles(struct udev *udev, const unsigned char *profiles, size_t size)
 265 {
 266         unsigned int i;
 267
 268         for (i = 0; i+4 <= size; i += 4) {
 269                 int profile;
 270
 271                 profile = profiles[i] << 8 | profiles[i+1];
 272                 switch (profile) {
 273                 case 0x03:
 274                 case 0x04:
 275                 case 0x05:
 276                         info(udev, "profile 0x%02x mo\n", profile);
 277                         cd_mo = 1;
 278                         break;
 279                 case 0x08:
 280                         info(udev, "profile 0x%02x cd_rom\n", profile);
 281                         cd_cd_rom = 1;
 282                         break;
 283                 case 0x09:
 284                         info(udev, "profile 0x%02x cd_r\n", profile);
 285                         cd_cd_r = 1;
 286                         break;
 287                 case 0x0A:
 288                         info(udev, "profile 0x%02x cd_rw\n", profile);
 289                         cd_cd_rw = 1;
 290                         break;
 291                 case 0x10:
 292                         info(udev, "profile 0x%02x dvd_rom\n", profile);
 293                         cd_dvd_rom = 1;
 294                         break;
 295                 case 0x12:
 296                         info(udev, "profile 0x%02x dvd_ram\n", profile);
 297                         cd_dvd_ram = 1;
 298                         break;
 299                 case 0x13:
 300                 case 0x14:
 301                         info(udev, "profile 0x%02x dvd_rw\n", profile);
 302                         cd_dvd_rw = 1;
 303                         break;
 304                 case 0x1B:
 305                         info(udev, "profile 0x%02x dvd_plus_r\n", profile);
 306                         cd_dvd_plus_r = 1;
 307                         break;
 308                 case 0x1A:
 309                         info(udev, "profile 0x%02x dvd_plus_rw\n", profile);
 310                         cd_dvd_plus_rw = 1;
 311                         break;
 312                 case 0x2A:
 313                         info(udev, "profile 0x%02x dvd_plus_rw_dl\n", profile);
 314                         cd_dvd_plus_rw_dl = 1;
 315                         break;
 316                 case 0x2B:
 317                         info(udev, "profile 0x%02x dvd_plus_r_dl\n", profile);
 318                         cd_dvd_plus_r_dl = 1;
 319                         break;
 320                 case 0x40:
 321                         cd_bd = 1;
 322                         info(udev, "profile 0x%02x bd\n", profile);
 323                         break;
 324                 case 0x41:
 325                 case 0x42:
 326                         cd_bd_r = 1;
 327                         info(udev, "profile 0x%02x bd_r\n", profile);
 328                         break;
 329                 case 0x43:
 330                         cd_bd_re = 1;
 331                         info(udev, "profile 0x%02x bd_re\n", profile);
 332                         break;
 333                 case 0x50:
 334                         cd_hddvd = 1;
 335                         info(udev, "profile 0x%02x hddvd\n", profile);
 336                         break;
 337                 case 0x51:
 338                         cd_hddvd_r = 1;
 339                         info(udev, "profile 0x%02x hddvd_r\n", profile);
 340                         break;
 341                 case 0x52:
 342                         cd_hddvd_rw = 1;
 343                         info(udev, "profile 0x%02x hddvd_rw\n", profile);
 344                         break;
 345                 default:
 346                         info(udev, "profile 0x%02x <ignored>\n", profile);
 347                         break;
 348                 }
 349         }
 350         return 0;
 351 }
 352
 353 static int cd_profiles_old_mmc(struct udev *udev, int fd)
 354 {
 355         struct scsi_cmd sc;
 356         int err;
 357
 358         unsigned char header[32];
 359
 360         scsi_cmd_init(udev, &sc, header, sizeof(header));
 361         scsi_cmd_set(udev, &sc, 0, 0x51);
 362         scsi_cmd_set(udev, &sc, 8, sizeof(header));
 363         scsi_cmd_set(udev, &sc, 9, 0);
 364         err = scsi_cmd_run(udev, &sc, fd, header, sizeof(header));
 365         if ((err != 0)) {
 366                 info_scsi_cmd_err(udev, "READ DISC INFORMATION", err);
 367                 if (cd_media == 1) {
 368                         info(udev, "no current profile, but disc is present; assuming CD-ROM\n");
 369                         cd_media_cd_rom = 1;
 370                         return 0;
 371                 } else {
 372                         info(udev, "no current profile, assuming no media\n");
 373                         return -1;
 374                 }
 375         };
 376
 377         cd_media = 1;
 378
 379         if (header[2] & 16) {
 380                 cd_media_cd_rw = 1;
 381                 info(udev, "profile 0x0a media_cd_rw\n");
 382         } else if ((header[2] & 3) < 2 && cd_cd_r) {
 383                 cd_media_cd_r = 1;
 384                 info(udev, "profile 0x09 media_cd_r\n");
 385         } else {
 386                 cd_media_cd_rom = 1;
 387                 info(udev, "profile 0x08 media_cd_rom\n");
 388         }
 389         return 0;
 390 }
 391
 392 static int cd_profiles(struct udev *udev, int fd)
 393 {
 394         struct scsi_cmd sc;
 395         unsigned char features[65530];
 396         unsigned int cur_profile = 0;
 397         unsigned int len;
 398         unsigned int i;
 399         int err;
 400
 401         scsi_cmd_init(udev, &sc, features, sizeof(features));
 402         scsi_cmd_set(udev, &sc, 0, 0x46);
 403         scsi_cmd_set(udev, &sc, 7, (sizeof(features) >> 8) & 0xff);
 404         scsi_cmd_set(udev, &sc, 8, sizeof(features) & 0xff);
 405         scsi_cmd_set(udev, &sc, 9, 0);
 406         err = scsi_cmd_run(udev, &sc, fd, features, sizeof(features));
 407         if ((err != 0)) {
 408                 info_scsi_cmd_err(udev, "GET CONFIGURATION", err);
 409                 /* handle pre-MMC2 drives which do not support GET CONFIGURATION */
 410                 if (SK(err) == 0x5 && ASC(err) == 0x20) {
 411                         info(udev, "drive is pre-MMC2 and does not support 46h get configuration command\n");
 412                         info(udev, "trying to work around the problem\n");
 413                         return cd_profiles_old_mmc(udev, fd);
 414                 }
 415                 return -1;
 416         }
 417
 418         len = features[0] << 24 | features[1] << 16 | features[2] << 8 | features[3];
 419         info(udev, "GET CONFIGURATION: size of features buffer 0x%04x\n", len);
 420
 421         if (len > sizeof(features)) {
 422                 info(udev, "can not get features in a single query, truncating\n");
 423                 len = sizeof(features);
 424         }
 425
 426         /* device features */
 427         for (i = 8; i+4 < len; i += (4 + features[i+3])) {
 428                 unsigned int feature;
 429
 430                 feature = features[i] << 8 | features[i+1];
 431
 432                 switch (feature) {
 433                 case 0x00:
 434                         info(udev, "GET CONFIGURATION: feature 'profiles', with %i entries\n", features[i+3] / 4);
 435                         feature_profiles(udev, &features[i]+4, features[i+3]);
 436                         break;
 437                 default:
 438                         info(udev, "GET CONFIGURATION: feature 0x%04x <ignored>, with 0x%02x bytes\n", feature, features[i+3]);
 439                         break;
 440                 }
 441         }
 442
 443         cur_profile = features[6] << 8 | features[7];
 444         if (cur_profile > 0) {
 445                 info(udev, "current profile 0x%02x\n", cur_profile);
 446         } else {
 447                 info(udev, "no current profile, assuming no media\n");
 448                 return -1;
 449         }
 450
 451         switch (cur_profile) {
 452         case 0x03:
 453         case 0x04:
 454         case 0x05:
 455                 info(udev, "profile 0x%02x \n", cur_profile);
 456                 cd_media = 1;
 457                 cd_media_mo = 1;
 458                 break;
 459         case 0x08:
 460                 info(udev, "profile 0x%02x media_cd_rom\n", cur_profile);
 461                 cd_media = 1;
 462                 cd_media_cd_rom = 1;
 463                 break;
 464         case 0x09:
 465                 info(udev, "profile 0x%02x media_cd_r\n", cur_profile);
 466                 cd_media = 1;
 467                 cd_media_cd_r = 1;
 468                 break;
 469         case 0x0a:
 470                 info(udev, "profile 0x%02x media_cd_rw\n", cur_profile);
 471                 cd_media = 1;
 472                 cd_media_cd_rw = 1;
 473                 break;
 474         case 0x10:
 475                 info(udev, "profile 0x%02x media_dvd_ro\n", cur_profile);
 476                 cd_media = 1;
 477                 cd_media_dvd_rom = 1;
 478                 break;
 479         case 0x11:
 480                 info(udev, "profile 0x%02x media_dvd_r\n", cur_profile);
 481                 cd_media = 1;
 482                 cd_media_dvd_r = 1;
 483                 break;
 484         case 0x12:
 485                 info(udev, "profile 0x%02x media_dvd_ram\n", cur_profile);
 486                 cd_media = 1;
 487                 cd_media_dvd_ram = 1;
 488                 break;
 489         case 0x13:
 490                 info(udev, "profile 0x%02x media_dvd_rw_ro\n", cur_profile);
 491                 cd_media = 1;
 492                 cd_media_dvd_rw = 1;
 493                 cd_media_dvd_rw_ro = 1;
 494                 break;
 495         case 0x14:
 496                 info(udev, "profile 0x%02x media_dvd_rw_seq\n", cur_profile);
 497                 cd_media = 1;
 498                 cd_media_dvd_rw = 1;
 499                 cd_media_dvd_rw_seq = 1;
 500                 break;
 501         case 0x1B:
 502                 info(udev, "profile 0x%02x media_dvd_plus_r\n", cur_profile);
 503                 cd_media = 1;
 504                 cd_media_dvd_plus_r = 1;
 505                 break;
 506         case 0x1A:
 507                 info(udev, "profile 0x%02x media_dvd_plus_rw\n", cur_profile);
 508                 cd_media = 1;
 509                 cd_media_dvd_plus_rw = 1;
 510                 break;
 511         case 0x2A:
 512                 info(udev, "profile 0x%02x media_dvd_plus_rw_dl\n", cur_profile);
 513                 cd_media = 1;
 514                 cd_media_dvd_plus_rw_dl = 1;
 515                 break;
 516         case 0x2B:
 517                 info(udev, "profile 0x%02x media_dvd_plus_r_dl\n", cur_profile);
 518                 cd_media = 1;
 519                 cd_media_dvd_plus_r_dl = 1;
 520                 break;
 521         case 0x40:
 522                 info(udev, "profile 0x%02x media_bd\n", cur_profile);
 523                 cd_media = 1;
 524                 cd_media_bd = 1;
 525                 break;
 526         case 0x41:
 527         case 0x42:
 528                 info(udev, "profile 0x%02x media_bd_r\n", cur_profile);
 529                 cd_media = 1;
 530                 cd_media_bd_r = 1;
 531                 break;
 532         case 0x43:
 533                 info(udev, "profile 0x%02x media_bd_re\n", cur_profile);
 534                 cd_media = 1;
 535                 cd_media_bd_re = 1;
 536                 break;
 537         case 0x50:
 538                 info(udev, "profile 0x%02x media_hddvd\n", cur_profile);
 539                 cd_media = 1;
 540                 cd_media_hddvd = 1;
 541                 break;
 542         case 0x51:
 543                 info(udev, "profile 0x%02x media_hddvd_r\n", cur_profile);
 544                 cd_media = 1;
 545                 cd_media_hddvd_r = 1;
 546                 break;
 547         case 0x52:
 548                 info(udev, "profile 0x%02x media_hddvd_rw\n", cur_profile);
 549                 cd_media = 1;
 550                 cd_media_hddvd_rw = 1;
 551                 break;
 552         default:
 553                 info(udev, "profile 0x%02x <ignored>\n", cur_profile);
 554                 break;
 555         }
 556         return 0;
 557 }
 558
 559 static int cd_media_info(struct udev *udev, int fd)
 560 {
 561         struct scsi_cmd sc;
 562         unsigned char header[32];
 563         static const char *media_status[] = {
 564                 "blank",
 565                 "appendable",
 566                 "complete",
 567                 "other"
 568         };
 569         int err;
 570
 571         scsi_cmd_init(udev, &sc, header, sizeof(header));
 572         scsi_cmd_set(udev, &sc, 0, 0x51);
 573         scsi_cmd_set(udev, &sc, 8, sizeof(header) & 0xff);
 574         scsi_cmd_set(udev, &sc, 9, 0);
 575         err = scsi_cmd_run(udev, &sc, fd, header, sizeof(header));
 576         if ((err != 0)) {
 577                 info_scsi_cmd_err(udev, "READ DISC INFORMATION", err);
 578                 return -1;
 579         };
 580
 581         cd_media = 1;
 582         info(udev, "disk type %02x\n", header[8]);
 583         info(udev, "hardware reported media status: %s\n", media_status[header[2] & 3]);
 584
 585         /* exclude plain CDROM, some fake cdroms return 0 for "blank" media here */
 586         if (!cd_media_cd_rom)
 587                 cd_media_state = media_status[header[2] & 3];
 588
 589         /* fresh DVD-RW in restricted overwite mode reports itself as
 590          * "appendable"; change it to "blank" to make it consistent with what
 591          * gets reported after blanking, and what userspace expects  */
 592         if (cd_media_dvd_rw_ro && (header[2] & 3) == 1)
 593                 cd_media_state = media_status[0];
 594
 595         /* DVD+RW discs (and DVD-RW in restricted mode) once formatted are
 596          * always "complete", DVD-RAM are "other" or "complete" if the disc is
 597          * write protected; we need to check the contents if it is blank */
 598         if ((cd_media_dvd_rw_ro || cd_media_dvd_plus_rw || cd_media_dvd_plus_rw_dl || cd_media_dvd_ram) && (header[2] & 3) > 1) {
 599                 unsigned char buffer[32 * 2048];
 600                 unsigned char result, len;
 601                 int block, offset;
 602
 603                 if (cd_media_dvd_ram) {
 604                         /* a write protected dvd-ram may report "complete" status */
 605
 606                         unsigned char dvdstruct[8];
 607                         unsigned char format[12];
 608
 609                         scsi_cmd_init(udev, &sc, dvdstruct, sizeof(dvdstruct));
 610                         scsi_cmd_set(udev, &sc, 0, 0xAD);
 611                         scsi_cmd_set(udev, &sc, 7, 0xC0);
 612                         scsi_cmd_set(udev, &sc, 9, sizeof(dvdstruct));
 613                         scsi_cmd_set(udev, &sc, 11, 0);
 614                         err = scsi_cmd_run(udev, &sc, fd, dvdstruct, sizeof(dvdstruct));
 615                         if ((err != 0)) {
 616                                 info_scsi_cmd_err(udev, "READ DVD STRUCTURE", err);
 617                                 return -1;
 618                         }
 619                         if (dvdstruct[4] & 0x02) {
 620                                 cd_media_state = media_status[2];
 621                                 info(udev, "write-protected DVD-RAM media inserted\n");
 622                                 goto determined;
 623                         }
 624
 625                         /* let's make sure we don't try to read unformatted media */
 626                         scsi_cmd_init(udev, &sc, format, sizeof(format));
 627                         scsi_cmd_set(udev, &sc, 0, 0x23);
 628                         scsi_cmd_set(udev, &sc, 8, sizeof(format));
 629                         scsi_cmd_set(udev, &sc, 9, 0);
 630                         err = scsi_cmd_run(udev, &sc, fd, format, sizeof(format));
 631                         if ((err != 0)) {
 632                                 info_scsi_cmd_err(udev, "READ DVD FORMAT CAPACITIES", err);
 633                                 return -1;
 634                         }
 635
 636                         len = format[3];
 637                         if (len & 7 || len < 16) {
 638                                 info(udev, "invalid format capacities length\n");
 639                                 return -1;
 640                         }
 641
 642                         switch(format[8] & 3) {
 643                             case 1:
 644                                 info(udev, "unformatted DVD-RAM media inserted\n");
 645                                 /* This means that last format was interrupted
 646                                  * or failed, blank dvd-ram discs are factory
 647                                  * formatted. Take no action here as it takes
 648                                  * quite a while to reformat a dvd-ram and it's
 649                                  * not automatically started */
 650                                 goto determined;
 651
 652                             case 2:
 653                                 info(udev, "formatted DVD-RAM media inserted\n");
 654                                 break;
 655
 656                             case 3:
 657                                 cd_media = 0; //return no media
 658                                 info(udev, "format capacities returned no media\n");
 659                                 return -1;
 660                         }
 661                 }
 662
 663                 /* Take a closer look at formatted media (unformatted DVD+RW
 664                  * has "blank" status", DVD-RAM was examined earlier) and check
 665                  * for ISO and UDF PVDs or a fs superblock presence and do it
 666                  * in one ioctl (we need just sectors 0 and 16) */
 667                 scsi_cmd_init(udev, &sc, buffer, sizeof(buffer));
 668                 scsi_cmd_set(udev, &sc, 0, 0x28);
 669                 scsi_cmd_set(udev, &sc, 5, 0);
 670                 scsi_cmd_set(udev, &sc, 8, 32);
 671                 scsi_cmd_set(udev, &sc, 9, 0);
 672                 err = scsi_cmd_run(udev, &sc, fd, buffer, sizeof(buffer));
 673                 if ((err != 0)) {
 674                         info_scsi_cmd_err(udev, "READ FIRST 32 BLOCKS", err);
 675                         return -1;
 676                 }
 677
 678                 /* if any non-zero data is found in sector 16 (iso and udf) or
 679                  * eventually 0 (fat32 boot sector, ext2 superblock, etc), disc
 680                  * is assumed non-blank */
 681                 result = 0;
 682
 683                 for (block = 32768; block >= 0 && !result; block -= 32768) {
 684                         offset = block;
 685                         while (offset < (block + 2048) && !result) {
 686                                 result = buffer [offset];
 687                                 offset++;
 688                         }
 689                 }
 690
 691                 if (!result) {
 692                         cd_media_state = media_status[0];
 693                         info(udev, "no data in blocks 0 or 16, assuming blank\n");
 694                 } else {
 695                         info(udev, "data in blocks 0 or 16, assuming complete\n");
 696                 }
 697         }
 698
 699 determined:
 700         /* "other" is e. g. DVD-RAM, can't append sessions there; DVDs in
 701          * restricted overwrite mode can never append, only in sequential mode */
 702         if ((header[2] & 3) < 2 && !cd_media_dvd_rw_ro)
 703                 cd_media_session_next = header[10] << 8 | header[5];
 704         cd_media_session_count = header[9] << 8 | header[4];
 705         cd_media_track_count = header[11] << 8 | header[6];
 706
 707         return 0;
 708 }
 709
 710 static int cd_media_toc(struct udev *udev, int fd)
 711 {
 712         struct scsi_cmd sc;
 713         unsigned char header[12];
 714         unsigned char toc[2048];
 715         unsigned int len, i;
 716         unsigned char *p;
 717         int err;
 718
 719         scsi_cmd_init(udev, &sc, header, sizeof(header));
 720         scsi_cmd_set(udev, &sc, 0, 0x43);
 721         scsi_cmd_set(udev, &sc, 6, 1);
 722         scsi_cmd_set(udev, &sc, 8, sizeof(header) & 0xff);
 723         scsi_cmd_set(udev, &sc, 9, 0);
 724         err = scsi_cmd_run(udev, &sc, fd, header, sizeof(header));
 725         if ((err != 0)) {
 726                 info_scsi_cmd_err(udev, "READ TOC", err);
 727                 return -1;
 728         }
 729
 730         len = (header[0] << 8 | header[1]) + 2;
 731         info(udev, "READ TOC: len: %d\n", len);
 732         if (len > sizeof(toc))
 733                 return -1;
 734         if (len < 2)
 735                 return -1;
 736
 737         /* empty media has no tracks */
 738         if (len < 8)
 739                 return 0;
 740
 741         scsi_cmd_init(udev, &sc, toc, sizeof(toc));
 742         scsi_cmd_set(udev, &sc, 0, 0x43);
 743         scsi_cmd_set(udev, &sc, 6, header[2]); /* First Track/Session Number */
 744         scsi_cmd_set(udev, &sc, 7, (len >> 8) & 0xff);
 745         scsi_cmd_set(udev, &sc, 8, len & 0xff);
 746         scsi_cmd_set(udev, &sc, 9, 0);
 747         err = scsi_cmd_run(udev, &sc, fd, toc, len);
 748         if ((err != 0)) {
 749                 info_scsi_cmd_err(udev, "READ TOC (tracks)", err);
 750                 return -1;
 751         }
 752
 753         for (p = toc+4, i = 4; i < len-8; i += 8, p += 8) {
 754                 unsigned int block;
 755                 unsigned int is_data_track;
 756
 757                 is_data_track = (p[1] & 0x04) != 0;
 758
 759                 block = p[4] << 24 | p[5] << 16 | p[6] << 8 | p[7];
 760                 info(udev, "track=%u info=0x%x(%s) start_block=%u\n",
 761                      p[2], p[1] & 0x0f, is_data_track ? "data":"audio", block);
 762
 763                 if (is_data_track)
 764                         cd_media_track_count_data++;
 765                 else
 766                         cd_media_track_count_audio++;
 767         }
 768
 769         scsi_cmd_init(udev, &sc, header, sizeof(header));
 770         scsi_cmd_set(udev, &sc, 0, 0x43);
 771         scsi_cmd_set(udev, &sc, 2, 1); /* Session Info */
 772         scsi_cmd_set(udev, &sc, 8, sizeof(header));
 773         scsi_cmd_set(udev, &sc, 9, 0);
 774         err = scsi_cmd_run(udev, &sc, fd, header, sizeof(header));
 775         if ((err != 0)) {
 776                 info_scsi_cmd_err(udev, "READ TOC (multi session)", err);
 777                 return -1;
 778         }
 779         len = header[4+4] << 24 | header[4+5] << 16 | header[4+6] << 8 | header[4+7];
 780         info(udev, "last track %u starts at block %u\n", header[4+2], len);
 781         cd_media_session_last_offset = (unsigned long long int)len * 2048;
 782         return 0;
 783 }
 784
 785 int main(int argc, char *argv[])
 786 {
 787         struct udev *udev;
 788         static const struct option options[] = {
 789                 { "export", no_argument, NULL, 'x' },
 790                 { "debug", no_argument, NULL, 'd' },
 791                 { "help", no_argument, NULL, 'h' },
 792                 {}
 793         };
 794         const char *node = NULL;
 795         int export = 0;
 796         int fd = -1;
 797         int cnt;
 798         int rc = 0;
 799
 800         udev = udev_new();
 801         if (udev == NULL)
 802                 goto exit;
 803
 804         udev_log_init("cdrom_id");
 805         udev_set_log_fn(udev, log_fn);
 806
 807         while (1) {
 808                 int option;
 809
 810                 option = getopt_long(argc, argv, "dxh", options, NULL);
 811                 if (option == -1)
 812                         break;
 813
 814                 switch (option) {
 815                 case 'd':
 816                         debug = 1;
 817                         if (udev_get_log_priority(udev) < LOG_INFO)
 818                                 udev_set_log_priority(udev, LOG_INFO);
 819                         break;
 820                 case 'x':
 821                         export = 1;
 822                         break;
 823                 case 'h':
 824                         printf("Usage: cdrom_id [options] <device>\n"
 825                                "  --export        export key/value pairs\n"
 826                                "  --debug         debug to stderr\n"
 827                                "  --help          print this help text\n\n");
 828                         goto exit;
 829                 default:
 830                         rc = 1;
 831                         goto exit;
 832                 }
 833         }
 834
 835         node = argv[optind];
 836         if (!node) {
 837                 err(udev, "no device\n");
 838                 fprintf(stderr, "no device\n");
 839                 rc = 1;
 840                 goto exit;
 841         }
 842
 843         srand((unsigned int)getpid());
 844         for (cnt = 20; cnt > 0; cnt--) {
 845                 struct timespec duration;
 846
 847                 fd = open(node, O_RDONLY|O_NONBLOCK|(is_mounted(node) ? 0 : O_EXCL));
 848                 if (fd >= 0 || errno != EBUSY)
 849                         break;
 850                 duration.tv_sec = 0;
 851                 duration.tv_nsec = (100 * 1000 * 1000) + (rand() % 100 * 1000 * 1000);
 852                 nanosleep(&duration, NULL);
 853         }
 854         if (fd < 0) {
 855                 info(udev, "unable to open '%s'\n", node);
 856                 fprintf(stderr, "unable to open '%s'\n", node);
 857                 rc = 1;
 858                 goto exit;
 859         }
 860         info(udev, "probing: '%s'\n", node);
 861
 862         /* same data as original cdrom_id */
 863         if (cd_capability_compat(udev, fd) < 0) {
 864                 rc = 1;
 865                 goto exit;
 866         }
 867
 868         /* check for media - don't bail if there's no media as we still need to
 869          * to read profiles */
 870         cd_media_compat(udev, fd);
 871
 872         /* check if drive talks MMC */
 873         if (cd_inquiry(udev, fd) < 0)
 874                 goto print;
 875
 876         /* read drive and possibly current profile */
 877         if (cd_profiles(udev, fd) < 0)
 878                 goto print;
 879
 880         /* get session/track info */
 881         cd_media_toc(udev, fd);
 882
 883         /* get writable media state */
 884         cd_media_info(udev, fd);
 885
 886 print:
 887         printf("ID_CDROM=1\n");
 888         if (cd_cd_rom)
 889                 printf("ID_CDROM_CD=1\n");
 890         if (cd_cd_r)
 891                 printf("ID_CDROM_CD_R=1\n");
 892         if (cd_cd_rw)
 893                 printf("ID_CDROM_CD_RW=1\n");
 894         if (cd_dvd_rom)
 895                 printf("ID_CDROM_DVD=1\n");
 896         if (cd_dvd_r)
 897                 printf("ID_CDROM_DVD_R=1\n");
 898         if (cd_dvd_rw)
 899                 printf("ID_CDROM_DVD_RW=1\n");
 900         if (cd_dvd_ram)
 901                 printf("ID_CDROM_DVD_RAM=1\n");
 902         if (cd_dvd_plus_r)
 903                 printf("ID_CDROM_DVD_PLUS_R=1\n");
 904         if (cd_dvd_plus_rw)
 905                 printf("ID_CDROM_DVD_PLUS_RW=1\n");
 906         if (cd_dvd_plus_r_dl)
 907                 printf("ID_CDROM_DVD_PLUS_R_DL=1\n");
 908         if (cd_dvd_plus_rw_dl)
 909                 printf("ID_CDROM_DVD_PLUS_RW_DL=1\n");
 910         if (cd_bd)
 911                 printf("ID_CDROM_BD=1\n");
 912         if (cd_bd_r)
 913                 printf("ID_CDROM_BD_R=1\n");
 914         if (cd_bd_re)
 915                 printf("ID_CDROM_BD_RE=1\n");
 916         if (cd_hddvd)
 917                 printf("ID_CDROM_HDDVD=1\n");
 918         if (cd_hddvd_r)
 919                 printf("ID_CDROM_HDDVD_R=1\n");
 920         if (cd_hddvd_rw)
 921                 printf("ID_CDROM_HDDVD_RW=1\n");
 922         if (cd_mo)
 923                 printf("ID_CDROM_MO=1\n");
 924         if (cd_mrw)
 925                 printf("ID_CDROM_MRW=1\n");
 926         if (cd_mrw_w)
 927                 printf("ID_CDROM_MRW_W=1\n");
 928
 929         if (cd_media)
 930                 printf("ID_CDROM_MEDIA=1\n");
 931         if (cd_media_mo)
 932                 printf("ID_CDROM_MEDIA_MO=1\n");
 933         if (cd_media_mrw)
 934                 printf("ID_CDROM_MEDIA_MRW=1\n");
 935         if (cd_media_mrw_w)
 936                 printf("ID_CDROM_MEDIA_MRW_W=1\n");
 937         if (cd_media_cd_rom)
 938                 printf("ID_CDROM_MEDIA_CD=1\n");
 939         if (cd_media_cd_r)
 940                 printf("ID_CDROM_MEDIA_CD_R=1\n");
 941         if (cd_media_cd_rw)
 942                 printf("ID_CDROM_MEDIA_CD_RW=1\n");
 943         if (cd_media_dvd_rom)
 944                 printf("ID_CDROM_MEDIA_DVD=1\n");
 945         if (cd_media_dvd_r)
 946                 printf("ID_CDROM_MEDIA_DVD_R=1\n");
 947         if (cd_media_dvd_ram)
 948                 printf("ID_CDROM_MEDIA_DVD_RAM=1\n");
 949         if (cd_media_dvd_rw)
 950                 printf("ID_CDROM_MEDIA_DVD_RW=1\n");
 951         if (cd_media_dvd_plus_r)
 952                 printf("ID_CDROM_MEDIA_DVD_PLUS_R=1\n");
 953         if (cd_media_dvd_plus_rw)
 954                 printf("ID_CDROM_MEDIA_DVD_PLUS_RW=1\n");
 955         if (cd_media_dvd_plus_rw_dl)
 956                 printf("ID_CDROM_MEDIA_DVD_PLUS_RW_DL=1\n");
 957         if (cd_media_dvd_plus_r_dl)
 958                 printf("ID_CDROM_MEDIA_DVD_PLUS_R_DL=1\n");
 959         if (cd_media_bd)
 960                 printf("ID_CDROM_MEDIA_BD=1\n");
 961         if (cd_media_bd_r)
 962                 printf("ID_CDROM_MEDIA_BD_R=1\n");
 963         if (cd_media_bd_re)
 964                 printf("ID_CDROM_MEDIA_BD_RE=1\n");
 965         if (cd_media_hddvd)
 966                 printf("ID_CDROM_MEDIA_HDDVD=1\n");
 967         if (cd_media_hddvd_r)
 968                 printf("ID_CDROM_MEDIA_HDDVD_R=1\n");
 969         if (cd_media_hddvd_rw)
 970                 printf("ID_CDROM_MEDIA_HDDVD_RW=1\n");
 971
 972         if (cd_media_state != NULL)
 973                 printf("ID_CDROM_MEDIA_STATE=%s\n", cd_media_state);
 974         if (cd_media_session_next > 0)
 975                 printf("ID_CDROM_MEDIA_SESSION_NEXT=%d\n", cd_media_session_next);
 976         if (cd_media_session_count > 0)
 977                 printf("ID_CDROM_MEDIA_SESSION_COUNT=%d\n", cd_media_session_count);
 978         if (cd_media_session_count > 1 && cd_media_session_last_offset > 0)
 979                 printf("ID_CDROM_MEDIA_SESSION_LAST_OFFSET=%llu\n", cd_media_session_last_offset);
 980         if (cd_media_track_count > 0)
 981                 printf("ID_CDROM_MEDIA_TRACK_COUNT=%d\n", cd_media_track_count);
 982         if (cd_media_track_count_audio > 0)
 983                 printf("ID_CDROM_MEDIA_TRACK_COUNT_AUDIO=%d\n", cd_media_track_count_audio);
 984         if (cd_media_track_count_data > 0)
 985                 printf("ID_CDROM_MEDIA_TRACK_COUNT_DATA=%d\n", cd_media_track_count_data);
 986 exit:
 987         if (fd >= 0)
 988                 close(fd);
 989         udev_unref(udev);
 990         udev_log_close();
 991         return rc;
 992 }
 993