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