src/udev/cdrom_id/cdrom_id.c

   1 /* SPDX-License-Identifier: GPL-2.0+ */
   2 /*
   3  * cdrom_id - optical drive and media information prober
   4  */
   5
   6 #include <errno.h>
   7 #include <fcntl.h>
   8 #include <getopt.h>
   9 #include <limits.h>
  10 #include <linux/cdrom.h>
  11 #include <scsi/sg.h>
  12 #include <stddef.h>
  13 #include <stdio.h>
  14 #include <stdlib.h>
  15 #include <string.h>
  16 #include <sys/ioctl.h>
  17 #include <sys/stat.h>
  18 #include <sys/time.h>
  19 #include <sys/types.h>
  20 #include <time.h>
  21 #include <unistd.h>
  22
  23 #include "log.h"
  24 #include "memory-util.h"
  25 #include "random-util.h"
  26 #include "udev-util.h"
  27
  28 /* device info */
  29 static unsigned cd_cd_rom;
  30 static unsigned cd_cd_r;
  31 static unsigned cd_cd_rw;
  32 static unsigned cd_dvd_rom;
  33 static unsigned cd_dvd_r;
  34 static unsigned cd_dvd_rw;
  35 static unsigned cd_dvd_ram;
  36 static unsigned cd_dvd_plus_r;
  37 static unsigned cd_dvd_plus_rw;
  38 static unsigned cd_dvd_plus_r_dl;
  39 static unsigned cd_dvd_plus_rw_dl;
  40 static unsigned cd_bd;
  41 static unsigned cd_bd_r;
  42 static unsigned cd_bd_re;
  43 static unsigned cd_hddvd;
  44 static unsigned cd_hddvd_r;
  45 static unsigned cd_hddvd_rw;
  46 static unsigned cd_mo;
  47 static unsigned cd_mrw;
  48 static unsigned cd_mrw_w;
  49
  50 /* media info */
  51 static unsigned cd_media;
  52 static unsigned cd_media_cd_rom;
  53 static unsigned cd_media_cd_r;
  54 static unsigned cd_media_cd_rw;
  55 static unsigned cd_media_dvd_rom;
  56 static unsigned cd_media_dvd_r;
  57 static unsigned cd_media_dvd_rw;
  58 static unsigned cd_media_dvd_rw_ro; /* restricted overwrite mode */
  59 static unsigned cd_media_dvd_rw_seq; /* sequential mode */
  60 static unsigned cd_media_dvd_ram;
  61 static unsigned cd_media_dvd_plus_r;
  62 static unsigned cd_media_dvd_plus_rw;
  63 static unsigned cd_media_dvd_plus_r_dl;
  64 static unsigned cd_media_dvd_plus_rw_dl;
  65 static unsigned cd_media_bd;
  66 static unsigned cd_media_bd_r;
  67 static unsigned cd_media_bd_re;
  68 static unsigned cd_media_hddvd;
  69 static unsigned cd_media_hddvd_r;
  70 static unsigned cd_media_hddvd_rw;
  71 static unsigned cd_media_mo;
  72 static unsigned cd_media_mrw;
  73 static unsigned cd_media_mrw_w;
  74
  75 static const char *cd_media_state = NULL;
  76 static unsigned cd_media_session_next;
  77 static unsigned cd_media_session_count;
  78 static unsigned cd_media_track_count;
  79 static unsigned cd_media_track_count_data;
  80 static unsigned cd_media_track_count_audio;
  81 static unsigned long long int cd_media_session_last_offset;
  82
  83 #define ERRCODE(s)        ((((s)[2] & 0x0F) << 16) | ((s)[12] << 8) | ((s)[13]))
  84 #define SK(errcode)        (((errcode) >> 16) & 0xF)
  85 #define ASC(errcode)        (((errcode) >> 8) & 0xFF)
  86 #define ASCQ(errcode)        ((errcode) & 0xFF)
  87
  88 static bool is_mounted(const char *device) {
  89         struct stat statbuf;
  90         FILE *fp;
  91         int maj, min;
  92         bool mounted = false;
  93
  94         if (stat(device, &statbuf) < 0)
  95                 return false;
  96
  97         fp = fopen("/proc/self/mountinfo", "re");
  98         if (!fp)
  99                 return false;
 100         while (fscanf(fp, "%*s %*s %i:%i %*[^\n]", &maj, &min) == 2) {
 101                 if (makedev(maj, min) == statbuf.st_rdev) {
 102                         mounted = true;
 103                         break;
 104                 }
 105         }
 106         fclose(fp);
 107         return mounted;
 108 }
 109
 110 static void info_scsi_cmd_err(const char *cmd, int err) {
 111         if (err == -1) {
 112                 log_debug("%s failed", cmd);
 113                 return;
 114         }
 115         log_debug("%s failed with SK=%Xh/ASC=%02Xh/ACQ=%02Xh", cmd, SK(err), ASC(err), ASCQ(err));
 116 }
 117
 118 struct scsi_cmd {
 119         struct cdrom_generic_command cgc;
 120         union {
 121                 struct request_sense s;
 122                 unsigned char u[18];
 123         } _sense;
 124         struct sg_io_hdr sg_io;
 125 };
 126
 127 static void scsi_cmd_init(struct scsi_cmd *cmd) {
 128         memzero(cmd, sizeof(struct scsi_cmd));
 129         cmd->cgc.quiet = 1;
 130         cmd->cgc.sense = &cmd->_sense.s;
 131         cmd->sg_io.interface_id = 'S';
 132         cmd->sg_io.mx_sb_len = sizeof(cmd->_sense);
 133         cmd->sg_io.cmdp = cmd->cgc.cmd;
 134         cmd->sg_io.sbp = cmd->_sense.u;
 135         cmd->sg_io.flags = SG_FLAG_LUN_INHIBIT | SG_FLAG_DIRECT_IO;
 136 }
 137
 138 static void scsi_cmd_set(struct scsi_cmd *cmd, size_t i, unsigned char arg) {
 139         cmd->sg_io.cmd_len = i + 1;
 140         cmd->cgc.cmd[i] = arg;
 141 }
 142
 143 #define CHECK_CONDITION 0x01
 144
 145 static int scsi_cmd_run(struct scsi_cmd *cmd, int fd, unsigned char *buf, size_t bufsize) {
 146         int ret = 0;
 147
 148         if (bufsize > 0) {
 149                 cmd->sg_io.dxferp = buf;
 150                 cmd->sg_io.dxfer_len = bufsize;
 151                 cmd->sg_io.dxfer_direction = SG_DXFER_FROM_DEV;
 152         } else {
 153                 cmd->sg_io.dxfer_direction = SG_DXFER_NONE;
 154         }
 155         if (ioctl(fd, SG_IO, &cmd->sg_io))
 156                 return -1;
 157
 158         if ((cmd->sg_io.info & SG_INFO_OK_MASK) != SG_INFO_OK) {
 159                 errno = EIO;
 160                 ret = -1;
 161                 if (cmd->sg_io.masked_status & CHECK_CONDITION) {
 162                         ret = ERRCODE(cmd->_sense.u);
 163                         if (ret == 0)
 164                                 ret = -1;
 165                 }
 166         }
 167         return ret;
 168 }
 169
 170 static int media_lock(int fd, bool lock) {
 171         int err;
 172
 173         /* disable the kernel's lock logic */
 174         err = ioctl(fd, CDROM_CLEAR_OPTIONS, CDO_LOCK);
 175         if (err < 0)
 176                 log_debug("CDROM_CLEAR_OPTIONS, CDO_LOCK failed");
 177
 178         err = ioctl(fd, CDROM_LOCKDOOR, lock ? 1 : 0);
 179         if (err < 0)
 180                 log_debug("CDROM_LOCKDOOR failed");
 181
 182         return err;
 183 }
 184
 185 static int media_eject(int fd) {
 186         struct scsi_cmd sc;
 187         int err;
 188
 189         scsi_cmd_init(&sc);
 190         scsi_cmd_set(&sc, 0, 0x1b);
 191         scsi_cmd_set(&sc, 4, 0x02);
 192         scsi_cmd_set(&sc, 5, 0);
 193         err = scsi_cmd_run(&sc, fd, NULL, 0);
 194         if ((err != 0)) {
 195                 info_scsi_cmd_err("START_STOP_UNIT", err);
 196                 return -1;
 197         }
 198         return 0;
 199 }
 200
 201 static int cd_capability_compat(int fd) {
 202         int capability;
 203
 204         capability = ioctl(fd, CDROM_GET_CAPABILITY, NULL);
 205         if (capability < 0) {
 206                 return log_debug_errno(errno, "CDROM_GET_CAPABILITY failed");
 207         }
 208
 209         if (capability & CDC_CD_R)
 210                 cd_cd_r = 1;
 211         if (capability & CDC_CD_RW)
 212                 cd_cd_rw = 1;
 213         if (capability & CDC_DVD)
 214                 cd_dvd_rom = 1;
 215         if (capability & CDC_DVD_R)
 216                 cd_dvd_r = 1;
 217         if (capability & CDC_DVD_RAM)
 218                 cd_dvd_ram = 1;
 219         if (capability & CDC_MRW)
 220                 cd_mrw = 1;
 221         if (capability & CDC_MRW_W)
 222                 cd_mrw_w = 1;
 223         return 0;
 224 }
 225
 226 static int cd_media_compat(int fd) {
 227         if (ioctl(fd, CDROM_DRIVE_STATUS, CDSL_CURRENT) != CDS_DISC_OK) {
 228                 return log_debug_errno(errno, "CDROM_DRIVE_STATUS != CDS_DISC_OK");
 229         }
 230         cd_media = 1;
 231         return 0;
 232 }
 233
 234 static int cd_inquiry(int fd) {
 235         struct scsi_cmd sc;
 236         unsigned char inq[128];
 237         int err;
 238
 239         scsi_cmd_init(&sc);
 240         scsi_cmd_set(&sc, 0, 0x12);
 241         scsi_cmd_set(&sc, 4, 36);
 242         scsi_cmd_set(&sc, 5, 0);
 243         err = scsi_cmd_run(&sc, fd, inq, 36);
 244         if ((err != 0)) {
 245                 info_scsi_cmd_err("INQUIRY", err);
 246                 return -1;
 247         }
 248
 249         if ((inq[0] & 0x1F) != 5) {
 250                 return log_debug_errno(SYNTHETIC_ERRNO(EINVAL), "not an MMC unit");
 251         }
 252
 253         log_debug("INQUIRY: [%.8s][%.16s][%.4s]", inq + 8, inq + 16, inq + 32);
 254         return 0;
 255 }
 256
 257 static void feature_profile_media(int cur_profile) {
 258         switch (cur_profile) {
 259         case 0x03:
 260         case 0x04:
 261         case 0x05:
 262                 log_debug("profile 0x%02x ", cur_profile);
 263                 cd_media = 1;
 264                 cd_media_mo = 1;
 265                 break;
 266         case 0x08:
 267                 log_debug("profile 0x%02x media_cd_rom", cur_profile);
 268                 cd_media = 1;
 269                 cd_media_cd_rom = 1;
 270                 break;
 271         case 0x09:
 272                 log_debug("profile 0x%02x media_cd_r", cur_profile);
 273                 cd_media = 1;
 274                 cd_media_cd_r = 1;
 275                 break;
 276         case 0x0a:
 277                 log_debug("profile 0x%02x media_cd_rw", cur_profile);
 278                 cd_media = 1;
 279                 cd_media_cd_rw = 1;
 280                 break;
 281         case 0x10:
 282                 log_debug("profile 0x%02x media_dvd_ro", cur_profile);
 283                 cd_media = 1;
 284                 cd_media_dvd_rom = 1;
 285                 break;
 286         case 0x11:
 287                 log_debug("profile 0x%02x media_dvd_r", cur_profile);
 288                 cd_media = 1;
 289                 cd_media_dvd_r = 1;
 290                 break;
 291         case 0x12:
 292                 log_debug("profile 0x%02x media_dvd_ram", cur_profile);
 293                 cd_media = 1;
 294                 cd_media_dvd_ram = 1;
 295                 break;
 296         case 0x13:
 297                 log_debug("profile 0x%02x media_dvd_rw_ro", cur_profile);
 298                 cd_media = 1;
 299                 cd_media_dvd_rw = 1;
 300                 cd_media_dvd_rw_ro = 1;
 301                 break;
 302         case 0x14:
 303                 log_debug("profile 0x%02x media_dvd_rw_seq", cur_profile);
 304                 cd_media = 1;
 305                 cd_media_dvd_rw = 1;
 306                 cd_media_dvd_rw_seq = 1;
 307                 break;
 308         case 0x1B:
 309                 log_debug("profile 0x%02x media_dvd_plus_r", cur_profile);
 310                 cd_media = 1;
 311                 cd_media_dvd_plus_r = 1;
 312                 break;
 313         case 0x1A:
 314                 log_debug("profile 0x%02x media_dvd_plus_rw", cur_profile);
 315                 cd_media = 1;
 316                 cd_media_dvd_plus_rw = 1;
 317                 break;
 318         case 0x2A:
 319                 log_debug("profile 0x%02x media_dvd_plus_rw_dl", cur_profile);
 320                 cd_media = 1;
 321                 cd_media_dvd_plus_rw_dl = 1;
 322                 break;
 323         case 0x2B:
 324                 log_debug("profile 0x%02x media_dvd_plus_r_dl", cur_profile);
 325                 cd_media = 1;
 326                 cd_media_dvd_plus_r_dl = 1;
 327                 break;
 328         case 0x40:
 329                 log_debug("profile 0x%02x media_bd", cur_profile);
 330                 cd_media = 1;
 331                 cd_media_bd = 1;
 332                 break;
 333         case 0x41:
 334         case 0x42:
 335                 log_debug("profile 0x%02x media_bd_r", cur_profile);
 336                 cd_media = 1;
 337                 cd_media_bd_r = 1;
 338                 break;
 339         case 0x43:
 340                 log_debug("profile 0x%02x media_bd_re", cur_profile);
 341                 cd_media = 1;
 342                 cd_media_bd_re = 1;
 343                 break;
 344         case 0x50:
 345                 log_debug("profile 0x%02x media_hddvd", cur_profile);
 346                 cd_media = 1;
 347                 cd_media_hddvd = 1;
 348                 break;
 349         case 0x51:
 350                 log_debug("profile 0x%02x media_hddvd_r", cur_profile);
 351                 cd_media = 1;
 352                 cd_media_hddvd_r = 1;
 353                 break;
 354         case 0x52:
 355                 log_debug("profile 0x%02x media_hddvd_rw", cur_profile);
 356                 cd_media = 1;
 357                 cd_media_hddvd_rw = 1;
 358                 break;
 359         default:
 360                 log_debug("profile 0x%02x <ignored>", cur_profile);
 361                 break;
 362         }
 363 }
 364
 365 static int feature_profiles(const unsigned char *profiles, size_t size) {
 366         unsigned i;
 367
 368         for (i = 0; i+4 <= size; i += 4) {
 369                 int profile;
 370
 371                 profile = profiles[i] << 8 | profiles[i+1];
 372                 switch (profile) {
 373                 case 0x03:
 374                 case 0x04:
 375                 case 0x05:
 376                         log_debug("profile 0x%02x mo", profile);
 377                         cd_mo = 1;
 378                         break;
 379                 case 0x08:
 380                         log_debug("profile 0x%02x cd_rom", profile);
 381                         cd_cd_rom = 1;
 382                         break;
 383                 case 0x09:
 384                         log_debug("profile 0x%02x cd_r", profile);
 385                         cd_cd_r = 1;
 386                         break;
 387                 case 0x0A:
 388                         log_debug("profile 0x%02x cd_rw", profile);
 389                         cd_cd_rw = 1;
 390                         break;
 391                 case 0x10:
 392                         log_debug("profile 0x%02x dvd_rom", profile);
 393                         cd_dvd_rom = 1;
 394                         break;
 395                 case 0x12:
 396                         log_debug("profile 0x%02x dvd_ram", profile);
 397                         cd_dvd_ram = 1;
 398                         break;
 399                 case 0x13:
 400                 case 0x14:
 401                         log_debug("profile 0x%02x dvd_rw", profile);
 402                         cd_dvd_rw = 1;
 403                         break;
 404                 case 0x1B:
 405                         log_debug("profile 0x%02x dvd_plus_r", profile);
 406                         cd_dvd_plus_r = 1;
 407                         break;
 408                 case 0x1A:
 409                         log_debug("profile 0x%02x dvd_plus_rw", profile);
 410                         cd_dvd_plus_rw = 1;
 411                         break;
 412                 case 0x2A:
 413                         log_debug("profile 0x%02x dvd_plus_rw_dl", profile);
 414                         cd_dvd_plus_rw_dl = 1;
 415                         break;
 416                 case 0x2B:
 417                         log_debug("profile 0x%02x dvd_plus_r_dl", profile);
 418                         cd_dvd_plus_r_dl = 1;
 419                         break;
 420                 case 0x40:
 421                         cd_bd = 1;
 422                         log_debug("profile 0x%02x bd", profile);
 423                         break;
 424                 case 0x41:
 425                 case 0x42:
 426                         cd_bd_r = 1;
 427                         log_debug("profile 0x%02x bd_r", profile);
 428                         break;
 429                 case 0x43:
 430                         cd_bd_re = 1;
 431                         log_debug("profile 0x%02x bd_re", profile);
 432                         break;
 433                 case 0x50:
 434                         cd_hddvd = 1;
 435                         log_debug("profile 0x%02x hddvd", profile);
 436                         break;
 437                 case 0x51:
 438                         cd_hddvd_r = 1;
 439                         log_debug("profile 0x%02x hddvd_r", profile);
 440                         break;
 441                 case 0x52:
 442                         cd_hddvd_rw = 1;
 443                         log_debug("profile 0x%02x hddvd_rw", profile);
 444                         break;
 445                 default:
 446                         log_debug("profile 0x%02x <ignored>", profile);
 447                         break;
 448                 }
 449         }
 450         return 0;
 451 }
 452
 453 /* returns 0 if media was detected */
 454 static int cd_profiles_old_mmc(int fd) {
 455         struct scsi_cmd sc;
 456         int err;
 457
 458         unsigned char header[32];
 459
 460         scsi_cmd_init(&sc);
 461         scsi_cmd_set(&sc, 0, 0x51);
 462         scsi_cmd_set(&sc, 8, sizeof(header));
 463         scsi_cmd_set(&sc, 9, 0);
 464         err = scsi_cmd_run(&sc, fd, header, sizeof(header));
 465         if ((err != 0)) {
 466                 info_scsi_cmd_err("READ DISC INFORMATION", err);
 467                 if (cd_media == 1) {
 468                         log_debug("no current profile, but disc is present; assuming CD-ROM");
 469                         cd_media_cd_rom = 1;
 470                         cd_media_track_count = 1;
 471                         cd_media_track_count_data = 1;
 472                         return 0;
 473                 } else {
 474                         return log_debug_errno(SYNTHETIC_ERRNO(ENOMEDIUM),
 475                                                "no current profile, assuming no media");
 476                 }
 477         };
 478
 479         cd_media = 1;
 480
 481         if (header[2] & 16) {
 482                 cd_media_cd_rw = 1;
 483                 log_debug("profile 0x0a media_cd_rw");
 484         } else if ((header[2] & 3) < 2 && cd_cd_r) {
 485                 cd_media_cd_r = 1;
 486                 log_debug("profile 0x09 media_cd_r");
 487         } else {
 488                 cd_media_cd_rom = 1;
 489                 log_debug("profile 0x08 media_cd_rom");
 490         }
 491         return 0;
 492 }
 493
 494 /* returns 0 if media was detected */
 495 static int cd_profiles(int fd) {
 496         struct scsi_cmd sc;
 497         unsigned char features[65530];
 498         unsigned cur_profile = 0;
 499         unsigned len;
 500         unsigned i;
 501         int err;
 502         int ret;
 503
 504         ret = -1;
 505
 506         /* First query the current profile */
 507         scsi_cmd_init(&sc);
 508         scsi_cmd_set(&sc, 0, 0x46);
 509         scsi_cmd_set(&sc, 8, 8);
 510         scsi_cmd_set(&sc, 9, 0);
 511         err = scsi_cmd_run(&sc, fd, features, 8);
 512         if ((err != 0)) {
 513                 info_scsi_cmd_err("GET CONFIGURATION", err);
 514                 /* handle pre-MMC2 drives which do not support GET CONFIGURATION */
 515                 if (SK(err) == 0x5 && IN_SET(ASC(err), 0x20, 0x24)) {
 516                         log_debug("drive is pre-MMC2 and does not support 46h get configuration command");
 517                         log_debug("trying to work around the problem");
 518                         ret = cd_profiles_old_mmc(fd);
 519                 }
 520                 goto out;
 521         }
 522
 523         cur_profile = features[6] << 8 | features[7];
 524         if (cur_profile > 0) {
 525                 log_debug("current profile 0x%02x", cur_profile);
 526                 feature_profile_media(cur_profile);
 527                 ret = 0; /* we have media */
 528         } else {
 529                 log_debug("no current profile, assuming no media");
 530         }
 531
 532         len = features[0] << 24 | features[1] << 16 | features[2] << 8 | features[3];
 533         log_debug("GET CONFIGURATION: size of features buffer 0x%04x", len);
 534
 535         if (len > sizeof(features)) {
 536                 log_debug("cannot get features in a single query, truncating");
 537                 len = sizeof(features);
 538         } else if (len <= 8)
 539                 len = sizeof(features);
 540
 541         /* Now get the full feature buffer */
 542         scsi_cmd_init(&sc);
 543         scsi_cmd_set(&sc, 0, 0x46);
 544         scsi_cmd_set(&sc, 7, ( len >> 8 ) & 0xff);
 545         scsi_cmd_set(&sc, 8, len & 0xff);
 546         scsi_cmd_set(&sc, 9, 0);
 547         err = scsi_cmd_run(&sc, fd, features, len);
 548         if ((err != 0)) {
 549                 info_scsi_cmd_err("GET CONFIGURATION", err);
 550                 return -1;
 551         }
 552
 553         /* parse the length once more, in case the drive decided to have other features suddenly :) */
 554         len = features[0] << 24 | features[1] << 16 | features[2] << 8 | features[3];
 555         log_debug("GET CONFIGURATION: size of features buffer 0x%04x", len);
 556
 557         if (len > sizeof(features)) {
 558                 log_debug("cannot get features in a single query, truncating");
 559                 len = sizeof(features);
 560         }
 561
 562         /* device features */
 563         for (i = 8; i+4 < len; i += (4 + features[i+3])) {
 564                 unsigned feature;
 565
 566                 feature = features[i] << 8 | features[i+1];
 567
 568                 switch (feature) {
 569                 case 0x00:
 570                         log_debug("GET CONFIGURATION: feature 'profiles', with %i entries", features[i+3] / 4);
 571                         feature_profiles(&features[i]+4, MIN(features[i+3], len - i - 4));
 572                         break;
 573                 default:
 574                         log_debug("GET CONFIGURATION: feature 0x%04x <ignored>, with 0x%02x bytes", feature, features[i+3]);
 575                         break;
 576                 }
 577         }
 578 out:
 579         return ret;
 580 }
 581
 582 static int cd_media_info(int fd) {
 583         struct scsi_cmd sc;
 584         unsigned char header[32];
 585         static const char *const media_status[] = {
 586                 "blank",
 587                 "appendable",
 588                 "complete",
 589                 "other"
 590         };
 591         int err;
 592
 593         scsi_cmd_init(&sc);
 594         scsi_cmd_set(&sc, 0, 0x51);
 595         scsi_cmd_set(&sc, 8, sizeof(header) & 0xff);
 596         scsi_cmd_set(&sc, 9, 0);
 597         err = scsi_cmd_run(&sc, fd, header, sizeof(header));
 598         if ((err != 0)) {
 599                 info_scsi_cmd_err("READ DISC INFORMATION", err);
 600                 return -1;
 601         };
 602
 603         cd_media = 1;
 604         log_debug("disk type %02x", header[8]);
 605         log_debug("hardware reported media status: %s", media_status[header[2] & 3]);
 606
 607         /* exclude plain CDROM, some fake cdroms return 0 for "blank" media here */
 608         if (!cd_media_cd_rom)
 609                 cd_media_state = media_status[header[2] & 3];
 610
 611         /* fresh DVD-RW in restricted overwrite mode reports itself as
 612          * "appendable"; change it to "blank" to make it consistent with what
 613          * gets reported after blanking, and what userspace expects  */
 614         if (cd_media_dvd_rw_ro && (header[2] & 3) == 1)
 615                 cd_media_state = media_status[0];
 616
 617         /* DVD+RW discs (and DVD-RW in restricted mode) once formatted are
 618          * always "complete", DVD-RAM are "other" or "complete" if the disc is
 619          * write protected; we need to check the contents if it is blank */
 620         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) {
 621                 unsigned char buffer[32 * 2048];
 622                 unsigned char len;
 623                 int offset;
 624
 625                 if (cd_media_dvd_ram) {
 626                         /* a write protected dvd-ram may report "complete" status */
 627
 628                         unsigned char dvdstruct[8];
 629                         unsigned char format[12];
 630
 631                         scsi_cmd_init(&sc);
 632                         scsi_cmd_set(&sc, 0, 0xAD);
 633                         scsi_cmd_set(&sc, 7, 0xC0);
 634                         scsi_cmd_set(&sc, 9, sizeof(dvdstruct));
 635                         scsi_cmd_set(&sc, 11, 0);
 636                         err = scsi_cmd_run(&sc, fd, dvdstruct, sizeof(dvdstruct));
 637                         if ((err != 0)) {
 638                                 info_scsi_cmd_err("READ DVD STRUCTURE", err);
 639                                 return -1;
 640                         }
 641                         if (dvdstruct[4] & 0x02) {
 642                                 cd_media_state = media_status[2];
 643                                 log_debug("write-protected DVD-RAM media inserted");
 644                                 goto determined;
 645                         }
 646
 647                         /* let's make sure we don't try to read unformatted media */
 648                         scsi_cmd_init(&sc);
 649                         scsi_cmd_set(&sc, 0, 0x23);
 650                         scsi_cmd_set(&sc, 8, sizeof(format));
 651                         scsi_cmd_set(&sc, 9, 0);
 652                         err = scsi_cmd_run(&sc, fd, format, sizeof(format));
 653                         if ((err != 0)) {
 654                                 info_scsi_cmd_err("READ DVD FORMAT CAPACITIES", err);
 655                                 return -1;
 656                         }
 657
 658                         len = format[3];
 659                         if (len & 7 || len < 16) {
 660                                 return log_debug_errno(SYNTHETIC_ERRNO(EINVAL),
 661                                                        "invalid format capacities length");
 662                         }
 663
 664                         switch(format[8] & 3) {
 665                             case 1:
 666                                 log_debug("unformatted DVD-RAM media inserted");
 667                                 /* This means that last format was interrupted
 668                                  * or failed, blank dvd-ram discs are factory
 669                                  * formatted. Take no action here as it takes
 670                                  * quite a while to reformat a dvd-ram and it's
 671                                  * not automatically started */
 672                                 goto determined;
 673
 674                             case 2:
 675                                 log_debug("formatted DVD-RAM media inserted");
 676                                 break;
 677
 678                             case 3:
 679                                 cd_media = 0; //return no media
 680                                 return log_debug_errno(SYNTHETIC_ERRNO(ENOMEDIUM),
 681                                                        "format capacities returned no media");
 682                         }
 683                 }
 684
 685                 /* Take a closer look at formatted media (unformatted DVD+RW
 686                  * has "blank" status", DVD-RAM was examined earlier) and check
 687                  * for ISO and UDF PVDs or a fs superblock presence and do it
 688                  * in one ioctl (we need just sectors 0 and 16) */
 689                 scsi_cmd_init(&sc);
 690                 scsi_cmd_set(&sc, 0, 0x28);
 691                 scsi_cmd_set(&sc, 5, 0);
 692                 scsi_cmd_set(&sc, 8, 32);
 693                 scsi_cmd_set(&sc, 9, 0);
 694                 err = scsi_cmd_run(&sc, fd, buffer, sizeof(buffer));
 695                 if ((err != 0)) {
 696                         cd_media = 0;
 697                         info_scsi_cmd_err("READ FIRST 32 BLOCKS", err);
 698                         return -1;
 699                 }
 700
 701                 /* if any non-zero data is found in sector 16 (iso and udf) or
 702                  * eventually 0 (fat32 boot sector, ext2 superblock, etc), disc
 703                  * is assumed non-blank */
 704
 705                 for (offset = 32768; offset < (32768 + 2048); offset++) {
 706                         if (buffer [offset]) {
 707                                 log_debug("data in block 16, assuming complete");
 708                                 goto determined;
 709                         }
 710                 }
 711
 712                 for (offset = 0; offset < 2048; offset++) {
 713                         if (buffer [offset]) {
 714                                 log_debug("data in block 0, assuming complete");
 715                                 goto determined;
 716                         }
 717                 }
 718
 719                 cd_media_state = media_status[0];
 720                 log_debug("no data in blocks 0 or 16, assuming blank");
 721         }
 722
 723 determined:
 724         /* "other" is e. g. DVD-RAM, can't append sessions there; DVDs in
 725          * restricted overwrite mode can never append, only in sequential mode */
 726         if ((header[2] & 3) < 2 && !cd_media_dvd_rw_ro)
 727                 cd_media_session_next = header[10] << 8 | header[5];
 728         cd_media_session_count = header[9] << 8 | header[4];
 729         cd_media_track_count = header[11] << 8 | header[6];
 730
 731         return 0;
 732 }
 733
 734 static int cd_media_toc(int fd) {
 735         struct scsi_cmd sc;
 736         unsigned char header[12];
 737         unsigned char toc[65536];
 738         unsigned len, i, num_tracks;
 739         unsigned char *p;
 740         int err;
 741
 742         scsi_cmd_init(&sc);
 743         scsi_cmd_set(&sc, 0, 0x43);
 744         scsi_cmd_set(&sc, 6, 1);
 745         scsi_cmd_set(&sc, 8, sizeof(header) & 0xff);
 746         scsi_cmd_set(&sc, 9, 0);
 747         err = scsi_cmd_run(&sc, fd, header, sizeof(header));
 748         if ((err != 0)) {
 749                 info_scsi_cmd_err("READ TOC", err);
 750                 return -1;
 751         }
 752
 753         len = (header[0] << 8 | header[1]) + 2;
 754         log_debug("READ TOC: len: %d, start track: %d, end track: %d", len, header[2], header[3]);
 755         if (len > sizeof(toc))
 756                 return -1;
 757         if (len < 2)
 758                 return -1;
 759         /* 2: first track, 3: last track */
 760         num_tracks = header[3] - header[2] + 1;
 761
 762         /* empty media has no tracks */
 763         if (len < 8)
 764                 return 0;
 765
 766         scsi_cmd_init(&sc);
 767         scsi_cmd_set(&sc, 0, 0x43);
 768         scsi_cmd_set(&sc, 6, header[2]); /* First Track/Session Number */
 769         scsi_cmd_set(&sc, 7, (len >> 8) & 0xff);
 770         scsi_cmd_set(&sc, 8, len & 0xff);
 771         scsi_cmd_set(&sc, 9, 0);
 772         err = scsi_cmd_run(&sc, fd, toc, len);
 773         if ((err != 0)) {
 774                 info_scsi_cmd_err("READ TOC (tracks)", err);
 775                 return -1;
 776         }
 777
 778         /* Take care to not iterate beyond the last valid track as specified in
 779          * the TOC, but also avoid going beyond the TOC length, just in case
 780          * the last track number is invalidly large */
 781         for (p = toc+4, i = 4; i < len-8 && num_tracks > 0; i += 8, p += 8, --num_tracks) {
 782                 unsigned block;
 783                 unsigned is_data_track;
 784
 785                 is_data_track = (p[1] & 0x04) != 0;
 786
 787                 block = p[4] << 24 | p[5] << 16 | p[6] << 8 | p[7];
 788                 log_debug("track=%u info=0x%x(%s) start_block=%u",
 789                      p[2], p[1] & 0x0f, is_data_track ? "data":"audio", block);
 790
 791                 if (is_data_track)
 792                         cd_media_track_count_data++;
 793                 else
 794                         cd_media_track_count_audio++;
 795         }
 796
 797         scsi_cmd_init(&sc);
 798         scsi_cmd_set(&sc, 0, 0x43);
 799         scsi_cmd_set(&sc, 2, 1); /* Session Info */
 800         scsi_cmd_set(&sc, 8, sizeof(header));
 801         scsi_cmd_set(&sc, 9, 0);
 802         err = scsi_cmd_run(&sc, fd, header, sizeof(header));
 803         if ((err != 0)) {
 804                 info_scsi_cmd_err("READ TOC (multi session)", err);
 805                 return -1;
 806         }
 807         len = header[4+4] << 24 | header[4+5] << 16 | header[4+6] << 8 | header[4+7];
 808         log_debug("last track %u starts at block %u", header[4+2], len);
 809         cd_media_session_last_offset = (unsigned long long int)len * 2048;
 810         return 0;
 811 }
 812
 813 int main(int argc, char *argv[]) {
 814         static const struct option options[] = {
 815                 { "lock-media", no_argument, NULL, 'l' },
 816                 { "unlock-media", no_argument, NULL, 'u' },
 817                 { "eject-media", no_argument, NULL, 'e' },
 818                 { "debug", no_argument, NULL, 'd' },
 819                 { "help", no_argument, NULL, 'h' },
 820                 {}
 821         };
 822         bool eject = false;
 823         bool lock = false;
 824         bool unlock = false;
 825         const char *node = NULL;
 826         int fd = -1;
 827         int cnt;
 828         int rc = 0;
 829
 830         log_set_target(LOG_TARGET_AUTO);
 831         udev_parse_config();
 832         log_parse_environment();
 833         log_open();
 834
 835         for (;;) {
 836                 int option;
 837
 838                 option = getopt_long(argc, argv, "deluh", options, NULL);
 839                 if (option == -1)
 840                         break;
 841
 842                 switch (option) {
 843                 case 'l':
 844                         lock = true;
 845                         break;
 846                 case 'u':
 847                         unlock = true;
 848                         break;
 849                 case 'e':
 850                         eject = true;
 851                         break;
 852                 case 'd':
 853                         log_set_target(LOG_TARGET_CONSOLE);
 854                         log_set_max_level(LOG_DEBUG);
 855                         log_open();
 856                         break;
 857                 case 'h':
 858                         printf("Usage: cdrom_id [options] <device>\n"
 859                                "  -l,--lock-media    lock the media (to enable eject request events)\n"
 860                                "  -u,--unlock-media  unlock the media\n"
 861                                "  -e,--eject-media   eject the media\n"
 862                                "  -d,--debug         debug to stderr\n"
 863                                "  -h,--help          print this help text\n\n");
 864                         goto exit;
 865                 default:
 866                         rc = 1;
 867                         goto exit;
 868                 }
 869         }
 870
 871         node = argv[optind];
 872         if (!node) {
 873                 log_error("no device");
 874                 rc = 1;
 875                 goto exit;
 876         }
 877
 878         initialize_srand();
 879         for (cnt = 20; cnt > 0; cnt--) {
 880                 struct timespec duration;
 881
 882                 fd = open(node, O_RDONLY|O_NONBLOCK|O_CLOEXEC|(is_mounted(node) ? 0 : O_EXCL));
 883                 if (fd >= 0 || errno != EBUSY)
 884                         break;
 885                 duration.tv_sec = 0;
 886                 duration.tv_nsec = (100 * 1000 * 1000) + (rand() % 100 * 1000 * 1000);
 887                 nanosleep(&duration, NULL);
 888         }
 889         if (fd < 0) {
 890                 log_debug("unable to open '%s'", node);
 891                 rc = 1;
 892                 goto exit;
 893         }
 894         log_debug("probing: '%s'", node);
 895
 896         /* same data as original cdrom_id */
 897         if (cd_capability_compat(fd) < 0) {
 898                 rc = 1;
 899                 goto exit;
 900         }
 901
 902         /* check for media - don't bail if there's no media as we still need to
 903          * to read profiles */
 904         cd_media_compat(fd);
 905
 906         /* check if drive talks MMC */
 907         if (cd_inquiry(fd) < 0)
 908                 goto work;
 909
 910         /* read drive and possibly current profile */
 911         if (cd_profiles(fd) != 0)
 912                 goto work;
 913
 914         /* at this point we are guaranteed to have media in the drive - find out more about it */
 915
 916         /* get session/track info */
 917         cd_media_toc(fd);
 918
 919         /* get writable media state */
 920         cd_media_info(fd);
 921
 922 work:
 923         /* lock the media, so we enable eject button events */
 924         if (lock && cd_media) {
 925                 log_debug("PREVENT_ALLOW_MEDIUM_REMOVAL (lock)");
 926                 media_lock(fd, true);
 927         }
 928
 929         if (unlock && cd_media) {
 930                 log_debug("PREVENT_ALLOW_MEDIUM_REMOVAL (unlock)");
 931                 media_lock(fd, false);
 932         }
 933
 934         if (eject) {
 935                 log_debug("PREVENT_ALLOW_MEDIUM_REMOVAL (unlock)");
 936                 media_lock(fd, false);
 937                 log_debug("START_STOP_UNIT (eject)");
 938                 media_eject(fd);
 939         }
 940
 941         printf("ID_CDROM=1\n");
 942         if (cd_cd_rom)
 943                 printf("ID_CDROM_CD=1\n");
 944         if (cd_cd_r)
 945                 printf("ID_CDROM_CD_R=1\n");
 946         if (cd_cd_rw)
 947                 printf("ID_CDROM_CD_RW=1\n");
 948         if (cd_dvd_rom)
 949                 printf("ID_CDROM_DVD=1\n");
 950         if (cd_dvd_r)
 951                 printf("ID_CDROM_DVD_R=1\n");
 952         if (cd_dvd_rw)
 953                 printf("ID_CDROM_DVD_RW=1\n");
 954         if (cd_dvd_ram)
 955                 printf("ID_CDROM_DVD_RAM=1\n");
 956         if (cd_dvd_plus_r)
 957                 printf("ID_CDROM_DVD_PLUS_R=1\n");
 958         if (cd_dvd_plus_rw)
 959                 printf("ID_CDROM_DVD_PLUS_RW=1\n");
 960         if (cd_dvd_plus_r_dl)
 961                 printf("ID_CDROM_DVD_PLUS_R_DL=1\n");
 962         if (cd_dvd_plus_rw_dl)
 963                 printf("ID_CDROM_DVD_PLUS_RW_DL=1\n");
 964         if (cd_bd)
 965                 printf("ID_CDROM_BD=1\n");
 966         if (cd_bd_r)
 967                 printf("ID_CDROM_BD_R=1\n");
 968         if (cd_bd_re)
 969                 printf("ID_CDROM_BD_RE=1\n");
 970         if (cd_hddvd)
 971                 printf("ID_CDROM_HDDVD=1\n");
 972         if (cd_hddvd_r)
 973                 printf("ID_CDROM_HDDVD_R=1\n");
 974         if (cd_hddvd_rw)
 975                 printf("ID_CDROM_HDDVD_RW=1\n");
 976         if (cd_mo)
 977                 printf("ID_CDROM_MO=1\n");
 978         if (cd_mrw)
 979                 printf("ID_CDROM_MRW=1\n");
 980         if (cd_mrw_w)
 981                 printf("ID_CDROM_MRW_W=1\n");
 982
 983         if (cd_media)
 984                 printf("ID_CDROM_MEDIA=1\n");
 985         if (cd_media_mo)
 986                 printf("ID_CDROM_MEDIA_MO=1\n");
 987         if (cd_media_mrw)
 988                 printf("ID_CDROM_MEDIA_MRW=1\n");
 989         if (cd_media_mrw_w)
 990                 printf("ID_CDROM_MEDIA_MRW_W=1\n");
 991         if (cd_media_cd_rom)
 992                 printf("ID_CDROM_MEDIA_CD=1\n");
 993         if (cd_media_cd_r)
 994                 printf("ID_CDROM_MEDIA_CD_R=1\n");
 995         if (cd_media_cd_rw)
 996                 printf("ID_CDROM_MEDIA_CD_RW=1\n");
 997         if (cd_media_dvd_rom)
 998                 printf("ID_CDROM_MEDIA_DVD=1\n");
 999         if (cd_media_dvd_r)
1000                 printf("ID_CDROM_MEDIA_DVD_R=1\n");
1001         if (cd_media_dvd_ram)
1002                 printf("ID_CDROM_MEDIA_DVD_RAM=1\n");
1003         if (cd_media_dvd_rw)
1004                 printf("ID_CDROM_MEDIA_DVD_RW=1\n");
1005         if (cd_media_dvd_plus_r)
1006                 printf("ID_CDROM_MEDIA_DVD_PLUS_R=1\n");
1007         if (cd_media_dvd_plus_rw)
1008                 printf("ID_CDROM_MEDIA_DVD_PLUS_RW=1\n");
1009         if (cd_media_dvd_plus_rw_dl)
1010                 printf("ID_CDROM_MEDIA_DVD_PLUS_RW_DL=1\n");
1011         if (cd_media_dvd_plus_r_dl)
1012                 printf("ID_CDROM_MEDIA_DVD_PLUS_R_DL=1\n");
1013         if (cd_media_bd)
1014                 printf("ID_CDROM_MEDIA_BD=1\n");
1015         if (cd_media_bd_r)
1016                 printf("ID_CDROM_MEDIA_BD_R=1\n");
1017         if (cd_media_bd_re)
1018                 printf("ID_CDROM_MEDIA_BD_RE=1\n");
1019         if (cd_media_hddvd)
1020                 printf("ID_CDROM_MEDIA_HDDVD=1\n");
1021         if (cd_media_hddvd_r)
1022                 printf("ID_CDROM_MEDIA_HDDVD_R=1\n");
1023         if (cd_media_hddvd_rw)
1024                 printf("ID_CDROM_MEDIA_HDDVD_RW=1\n");
1025
1026         if (cd_media_state)
1027                 printf("ID_CDROM_MEDIA_STATE=%s\n", cd_media_state);
1028         if (cd_media_session_next > 0)
1029                 printf("ID_CDROM_MEDIA_SESSION_NEXT=%u\n", cd_media_session_next);
1030         if (cd_media_session_count > 0)
1031                 printf("ID_CDROM_MEDIA_SESSION_COUNT=%u\n", cd_media_session_count);
1032         if (cd_media_session_count > 1 && cd_media_session_last_offset > 0)
1033                 printf("ID_CDROM_MEDIA_SESSION_LAST_OFFSET=%llu\n", cd_media_session_last_offset);
1034         if (cd_media_track_count > 0)
1035                 printf("ID_CDROM_MEDIA_TRACK_COUNT=%u\n", cd_media_track_count);
1036         if (cd_media_track_count_audio > 0)
1037                 printf("ID_CDROM_MEDIA_TRACK_COUNT_AUDIO=%u\n", cd_media_track_count_audio);
1038         if (cd_media_track_count_data > 0)
1039                 printf("ID_CDROM_MEDIA_TRACK_COUNT_DATA=%u\n", cd_media_track_count_data);
1040 exit:
1041         if (fd >= 0)
1042                 close(fd);
1043         log_close();
1044         return rc;
1045 }