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 void feature_profile_media(struct udev *udev, int cur_profile)
 265 {
 266         switch (cur_profile) {
 267         case 0x03:
 268         case 0x04:
 269         case 0x05:
 270                 info(udev, "profile 0x%02x \n", cur_profile);
 271                 cd_media = 1;
 272                 cd_media_mo = 1;
 273                 break;
 274         case 0x08:
 275                 info(udev, "profile 0x%02x media_cd_rom\n", cur_profile);
 276                 cd_media = 1;
 277                 cd_media_cd_rom = 1;
 278                 break;
 279         case 0x09:
 280                 info(udev, "profile 0x%02x media_cd_r\n", cur_profile);
 281                 cd_media = 1;
 282                 cd_media_cd_r = 1;
 283                 break;
 284         case 0x0a:
 285                 info(udev, "profile 0x%02x media_cd_rw\n", cur_profile);
 286                 cd_media = 1;
 287                 cd_media_cd_rw = 1;
 288                 break;
 289         case 0x10:
 290                 info(udev, "profile 0x%02x media_dvd_ro\n", cur_profile);
 291                 cd_media = 1;
 292                 cd_media_dvd_rom = 1;
 293                 break;
 294         case 0x11:
 295                 info(udev, "profile 0x%02x media_dvd_r\n", cur_profile);
 296                 cd_media = 1;
 297                 cd_media_dvd_r = 1;
 298                 break;
 299         case 0x12:
 300                 info(udev, "profile 0x%02x media_dvd_ram\n", cur_profile);
 301                 cd_media = 1;
 302                 cd_media_dvd_ram = 1;
 303                 break;
 304         case 0x13:
 305                 info(udev, "profile 0x%02x media_dvd_rw_ro\n", cur_profile);
 306                 cd_media = 1;
 307                 cd_media_dvd_rw = 1;
 308                 cd_media_dvd_rw_ro = 1;
 309                 break;
 310         case 0x14:
 311                 info(udev, "profile 0x%02x media_dvd_rw_seq\n", cur_profile);
 312                 cd_media = 1;
 313                 cd_media_dvd_rw = 1;
 314                 cd_media_dvd_rw_seq = 1;
 315                 break;
 316         case 0x1B:
 317                 info(udev, "profile 0x%02x media_dvd_plus_r\n", cur_profile);
 318                 cd_media = 1;
 319                 cd_media_dvd_plus_r = 1;
 320                 break;
 321         case 0x1A:
 322                 info(udev, "profile 0x%02x media_dvd_plus_rw\n", cur_profile);
 323                 cd_media = 1;
 324                 cd_media_dvd_plus_rw = 1;
 325                 break;
 326         case 0x2A:
 327                 info(udev, "profile 0x%02x media_dvd_plus_rw_dl\n", cur_profile);
 328                 cd_media = 1;
 329                 cd_media_dvd_plus_rw_dl = 1;
 330                 break;
 331         case 0x2B:
 332                 info(udev, "profile 0x%02x media_dvd_plus_r_dl\n", cur_profile);
 333                 cd_media = 1;
 334                 cd_media_dvd_plus_r_dl = 1;
 335                 break;
 336         case 0x40:
 337                 info(udev, "profile 0x%02x media_bd\n", cur_profile);
 338                 cd_media = 1;
 339                 cd_media_bd = 1;
 340                 break;
 341         case 0x41:
 342         case 0x42:
 343                 info(udev, "profile 0x%02x media_bd_r\n", cur_profile);
 344                 cd_media = 1;
 345                 cd_media_bd_r = 1;
 346                 break;
 347         case 0x43:
 348                 info(udev, "profile 0x%02x media_bd_re\n", cur_profile);
 349                 cd_media = 1;
 350                 cd_media_bd_re = 1;
 351                 break;
 352         case 0x50:
 353                 info(udev, "profile 0x%02x media_hddvd\n", cur_profile);
 354                 cd_media = 1;
 355                 cd_media_hddvd = 1;
 356                 break;
 357         case 0x51:
 358                 info(udev, "profile 0x%02x media_hddvd_r\n", cur_profile);
 359                 cd_media = 1;
 360                 cd_media_hddvd_r = 1;
 361                 break;
 362         case 0x52:
 363                 info(udev, "profile 0x%02x media_hddvd_rw\n", cur_profile);
 364                 cd_media = 1;
 365                 cd_media_hddvd_rw = 1;
 366                 break;
 367         default:
 368                 info(udev, "profile 0x%02x <ignored>\n", cur_profile);
 369                 break;
 370         }
 371 }
 372
 373 static int feature_profiles(struct udev *udev, const unsigned char *profiles, size_t size)
 374 {
 375         unsigned int i;
 376
 377         for (i = 0; i+4 <= size; i += 4) {
 378                 int profile;
 379
 380                 profile = profiles[i] << 8 | profiles[i+1];
 381                 switch (profile) {
 382                 case 0x03:
 383                 case 0x04:
 384                 case 0x05:
 385                         info(udev, "profile 0x%02x mo\n", profile);
 386                         cd_mo = 1;
 387                         break;
 388                 case 0x08:
 389                         info(udev, "profile 0x%02x cd_rom\n", profile);
 390                         cd_cd_rom = 1;
 391                         break;
 392                 case 0x09:
 393                         info(udev, "profile 0x%02x cd_r\n", profile);
 394                         cd_cd_r = 1;
 395                         break;
 396                 case 0x0A:
 397                         info(udev, "profile 0x%02x cd_rw\n", profile);
 398                         cd_cd_rw = 1;
 399                         break;
 400                 case 0x10:
 401                         info(udev, "profile 0x%02x dvd_rom\n", profile);
 402                         cd_dvd_rom = 1;
 403                         break;
 404                 case 0x12:
 405                         info(udev, "profile 0x%02x dvd_ram\n", profile);
 406                         cd_dvd_ram = 1;
 407                         break;
 408                 case 0x13:
 409                 case 0x14:
 410                         info(udev, "profile 0x%02x dvd_rw\n", profile);
 411                         cd_dvd_rw = 1;
 412                         break;
 413                 case 0x1B:
 414                         info(udev, "profile 0x%02x dvd_plus_r\n", profile);
 415                         cd_dvd_plus_r = 1;
 416                         break;
 417                 case 0x1A:
 418                         info(udev, "profile 0x%02x dvd_plus_rw\n", profile);
 419                         cd_dvd_plus_rw = 1;
 420                         break;
 421                 case 0x2A:
 422                         info(udev, "profile 0x%02x dvd_plus_rw_dl\n", profile);
 423                         cd_dvd_plus_rw_dl = 1;
 424                         break;
 425                 case 0x2B:
 426                         info(udev, "profile 0x%02x dvd_plus_r_dl\n", profile);
 427                         cd_dvd_plus_r_dl = 1;
 428                         break;
 429                 case 0x40:
 430                         cd_bd = 1;
 431                         info(udev, "profile 0x%02x bd\n", profile);
 432                         break;
 433                 case 0x41:
 434                 case 0x42:
 435                         cd_bd_r = 1;
 436                         info(udev, "profile 0x%02x bd_r\n", profile);
 437                         break;
 438                 case 0x43:
 439                         cd_bd_re = 1;
 440                         info(udev, "profile 0x%02x bd_re\n", profile);
 441                         break;
 442                 case 0x50:
 443                         cd_hddvd = 1;
 444                         info(udev, "profile 0x%02x hddvd\n", profile);
 445                         break;
 446                 case 0x51:
 447                         cd_hddvd_r = 1;
 448                         info(udev, "profile 0x%02x hddvd_r\n", profile);
 449                         break;
 450                 case 0x52:
 451                         cd_hddvd_rw = 1;
 452                         info(udev, "profile 0x%02x hddvd_rw\n", profile);
 453                         break;
 454                 default:
 455                         info(udev, "profile 0x%02x <ignored>\n", profile);
 456                         break;
 457                 }
 458         }
 459         return 0;
 460 }
 461
 462 /* returns 0 if media was detected */
 463 static int cd_profiles_old_mmc(struct udev *udev, int fd)
 464 {
 465         struct scsi_cmd sc;
 466         int err;
 467
 468         unsigned char header[32];
 469
 470         scsi_cmd_init(udev, &sc, header, sizeof(header));
 471         scsi_cmd_set(udev, &sc, 0, 0x51);
 472         scsi_cmd_set(udev, &sc, 8, sizeof(header));
 473         scsi_cmd_set(udev, &sc, 9, 0);
 474         err = scsi_cmd_run(udev, &sc, fd, header, sizeof(header));
 475         if ((err != 0)) {
 476                 info_scsi_cmd_err(udev, "READ DISC INFORMATION", err);
 477                 if (cd_media == 1) {
 478                         info(udev, "no current profile, but disc is present; assuming CD-ROM\n");
 479                         cd_media_cd_rom = 1;
 480                         return 0;
 481                 } else {
 482                         info(udev, "no current profile, assuming no media\n");
 483                         return -1;
 484                 }
 485         };
 486
 487         cd_media = 1;
 488
 489         if (header[2] & 16) {
 490                 cd_media_cd_rw = 1;
 491                 info(udev, "profile 0x0a media_cd_rw\n");
 492         } else if ((header[2] & 3) < 2 && cd_cd_r) {
 493                 cd_media_cd_r = 1;
 494                 info(udev, "profile 0x09 media_cd_r\n");
 495         } else {
 496                 cd_media_cd_rom = 1;
 497                 info(udev, "profile 0x08 media_cd_rom\n");
 498         }
 499         return 0;
 500 }
 501
 502 /* returns 0 if media was detected */
 503 static int cd_profiles(struct udev *udev, int fd)
 504 {
 505         struct scsi_cmd sc;
 506         unsigned char features[65530];
 507         unsigned int cur_profile = 0;
 508         unsigned int len;
 509         unsigned int i;
 510         int err;
 511         int ret;
 512
 513         ret = -1;
 514
 515         /* First query the current profile */
 516         scsi_cmd_init(udev, &sc, features, sizeof(features));
 517         scsi_cmd_set(udev, &sc, 0, 0x46);
 518         scsi_cmd_set(udev, &sc, 8, 8);
 519         scsi_cmd_set(udev, &sc, 9, 0);
 520         err = scsi_cmd_run(udev, &sc, fd, features, 8);
 521         if ((err != 0)) {
 522                 info_scsi_cmd_err(udev, "GET CONFIGURATION", err);
 523                 /* handle pre-MMC2 drives which do not support GET CONFIGURATION */
 524                 if (SK(err) == 0x5 && ASC(err) == 0x20) {
 525                         info(udev, "drive is pre-MMC2 and does not support 46h get configuration command\n");
 526                         info(udev, "trying to work around the problem\n");
 527                         ret = cd_profiles_old_mmc(udev, fd);
 528                 }
 529                 goto out;
 530         }
 531
 532         cur_profile = features[6] << 8 | features[7];
 533         if (cur_profile > 0) {
 534                 info(udev, "current profile 0x%02x\n", cur_profile);
 535                 feature_profile_media (udev, cur_profile);
 536                 ret = 0; /* we have media */
 537         } else {
 538                 info(udev, "no current profile, assuming no media\n");
 539         }
 540
 541         len = features[0] << 24 | features[1] << 16 | features[2] << 8 | features[3];
 542         info(udev, "GET CONFIGURATION: size of features buffer 0x%04x\n", len);
 543
 544         if (len > sizeof(features)) {
 545                 info(udev, "can not get features in a single query, truncating\n");
 546                 len = sizeof(features);
 547         } else if (len <= 8) {
 548                 len = sizeof(features);
 549         }
 550
 551         /* Now get the full feature buffer */
 552         scsi_cmd_init(udev, &sc, features,  len);
 553         scsi_cmd_set(udev, &sc, 0, 0x46);
 554         scsi_cmd_set(udev, &sc, 7, ( len >> 8 ) & 0xff);
 555         scsi_cmd_set(udev, &sc, 8, len & 0xff);
 556         scsi_cmd_set(udev, &sc, 9, 0);
 557         err = scsi_cmd_run(udev, &sc, fd, features, len);
 558         if ((err != 0)) {
 559                 info_scsi_cmd_err(udev, "GET CONFIGURATION", err);
 560                 return -1;
 561         }
 562
 563         /* parse the length once more, in case the drive decided to have other features suddenly :) */
 564         len = features[0] << 24 | features[1] << 16 | features[2] << 8 | features[3];
 565         info(udev, "GET CONFIGURATION: size of features buffer 0x%04x\n", len);
 566
 567         if (len > sizeof(features)) {
 568                 info(udev, "can not get features in a single query, truncating\n");
 569                 len = sizeof(features);
 570         }
 571
 572         /* device features */
 573         for (i = 8; i+4 < len; i += (4 + features[i+3])) {
 574                 unsigned int feature;
 575
 576                 feature = features[i] << 8 | features[i+1];
 577
 578                 switch (feature) {
 579                 case 0x00:
 580                         info(udev, "GET CONFIGURATION: feature 'profiles', with %i entries\n", features[i+3] / 4);
 581                         feature_profiles(udev, &features[i]+4, features[i+3]);
 582                         break;
 583                 default:
 584                         info(udev, "GET CONFIGURATION: feature 0x%04x <ignored>, with 0x%02x bytes\n", feature, features[i+3]);
 585                         break;
 586                 }
 587         }
 588 out:
 589         return ret;
 590 }
 591
 592 static int cd_media_info(struct udev *udev, int fd)
 593 {
 594         struct scsi_cmd sc;
 595         unsigned char header[32];
 596         static const char *media_status[] = {
 597                 "blank",
 598                 "appendable",
 599                 "complete",
 600                 "other"
 601         };
 602         int err;
 603
 604         scsi_cmd_init(udev, &sc, header, sizeof(header));
 605         scsi_cmd_set(udev, &sc, 0, 0x51);
 606         scsi_cmd_set(udev, &sc, 8, sizeof(header) & 0xff);
 607         scsi_cmd_set(udev, &sc, 9, 0);
 608         err = scsi_cmd_run(udev, &sc, fd, header, sizeof(header));
 609         if ((err != 0)) {
 610                 info_scsi_cmd_err(udev, "READ DISC INFORMATION", err);
 611                 return -1;
 612         };
 613
 614         cd_media = 1;
 615         info(udev, "disk type %02x\n", header[8]);
 616         info(udev, "hardware reported media status: %s\n", media_status[header[2] & 3]);
 617
 618         /* exclude plain CDROM, some fake cdroms return 0 for "blank" media here */
 619         if (!cd_media_cd_rom)
 620                 cd_media_state = media_status[header[2] & 3];
 621
 622         /* fresh DVD-RW in restricted overwite mode reports itself as
 623          * "appendable"; change it to "blank" to make it consistent with what
 624          * gets reported after blanking, and what userspace expects  */
 625         if (cd_media_dvd_rw_ro && (header[2] & 3) == 1)
 626                 cd_media_state = media_status[0];
 627
 628         /* DVD+RW discs (and DVD-RW in restricted mode) once formatted are
 629          * always "complete", DVD-RAM are "other" or "complete" if the disc is
 630          * write protected; we need to check the contents if it is blank */
 631         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) {
 632                 unsigned char buffer[32 * 2048];
 633                 unsigned char result, len;
 634                 int block, offset;
 635
 636                 if (cd_media_dvd_ram) {
 637                         /* a write protected dvd-ram may report "complete" status */
 638
 639                         unsigned char dvdstruct[8];
 640                         unsigned char format[12];
 641
 642                         scsi_cmd_init(udev, &sc, dvdstruct, sizeof(dvdstruct));
 643                         scsi_cmd_set(udev, &sc, 0, 0xAD);
 644                         scsi_cmd_set(udev, &sc, 7, 0xC0);
 645                         scsi_cmd_set(udev, &sc, 9, sizeof(dvdstruct));
 646                         scsi_cmd_set(udev, &sc, 11, 0);
 647                         err = scsi_cmd_run(udev, &sc, fd, dvdstruct, sizeof(dvdstruct));
 648                         if ((err != 0)) {
 649                                 info_scsi_cmd_err(udev, "READ DVD STRUCTURE", err);
 650                                 return -1;
 651                         }
 652                         if (dvdstruct[4] & 0x02) {
 653                                 cd_media_state = media_status[2];
 654                                 info(udev, "write-protected DVD-RAM media inserted\n");
 655                                 goto determined;
 656                         }
 657
 658                         /* let's make sure we don't try to read unformatted media */
 659                         scsi_cmd_init(udev, &sc, format, sizeof(format));
 660                         scsi_cmd_set(udev, &sc, 0, 0x23);
 661                         scsi_cmd_set(udev, &sc, 8, sizeof(format));
 662                         scsi_cmd_set(udev, &sc, 9, 0);
 663                         err = scsi_cmd_run(udev, &sc, fd, format, sizeof(format));
 664                         if ((err != 0)) {
 665                                 info_scsi_cmd_err(udev, "READ DVD FORMAT CAPACITIES", err);
 666                                 return -1;
 667                         }
 668
 669                         len = format[3];
 670                         if (len & 7 || len < 16) {
 671                                 info(udev, "invalid format capacities length\n");
 672                                 return -1;
 673                         }
 674
 675                         switch(format[8] & 3) {
 676                             case 1:
 677                                 info(udev, "unformatted DVD-RAM media inserted\n");
 678                                 /* This means that last format was interrupted
 679                                  * or failed, blank dvd-ram discs are factory
 680                                  * formatted. Take no action here as it takes
 681                                  * quite a while to reformat a dvd-ram and it's
 682                                  * not automatically started */
 683                                 goto determined;
 684
 685                             case 2:
 686                                 info(udev, "formatted DVD-RAM media inserted\n");
 687                                 break;
 688
 689                             case 3:
 690                                 cd_media = 0; //return no media
 691                                 info(udev, "format capacities returned no media\n");
 692                                 return -1;
 693                         }
 694                 }
 695
 696                 /* Take a closer look at formatted media (unformatted DVD+RW
 697                  * has "blank" status", DVD-RAM was examined earlier) and check
 698                  * for ISO and UDF PVDs or a fs superblock presence and do it
 699                  * in one ioctl (we need just sectors 0 and 16) */
 700                 scsi_cmd_init(udev, &sc, buffer, sizeof(buffer));
 701                 scsi_cmd_set(udev, &sc, 0, 0x28);
 702                 scsi_cmd_set(udev, &sc, 5, 0);
 703                 scsi_cmd_set(udev, &sc, 8, 32);
 704                 scsi_cmd_set(udev, &sc, 9, 0);
 705                 err = scsi_cmd_run(udev, &sc, fd, buffer, sizeof(buffer));
 706                 if ((err != 0)) {
 707                         cd_media = 0;
 708                         info_scsi_cmd_err(udev, "READ FIRST 32 BLOCKS", err);
 709                         return -1;
 710                 }
 711
 712                 /* if any non-zero data is found in sector 16 (iso and udf) or
 713                  * eventually 0 (fat32 boot sector, ext2 superblock, etc), disc
 714                  * is assumed non-blank */
 715                 result = 0;
 716
 717                 for (block = 32768; block >= 0 && !result; block -= 32768) {
 718                         offset = block;
 719                         while (offset < (block + 2048) && !result) {
 720                                 result = buffer [offset];
 721                                 offset++;
 722                         }
 723                 }
 724
 725                 if (!result) {
 726                         cd_media_state = media_status[0];
 727                         info(udev, "no data in blocks 0 or 16, assuming blank\n");
 728                 } else {
 729                         info(udev, "data in blocks 0 or 16, assuming complete\n");
 730                 }
 731         }
 732
 733 determined:
 734         /* "other" is e. g. DVD-RAM, can't append sessions there; DVDs in
 735          * restricted overwrite mode can never append, only in sequential mode */
 736         if ((header[2] & 3) < 2 && !cd_media_dvd_rw_ro)
 737                 cd_media_session_next = header[10] << 8 | header[5];
 738         cd_media_session_count = header[9] << 8 | header[4];
 739         cd_media_track_count = header[11] << 8 | header[6];
 740
 741         return 0;
 742 }
 743
 744 static int cd_media_toc(struct udev *udev, int fd)
 745 {
 746         struct scsi_cmd sc;
 747         unsigned char header[12];
 748         unsigned char toc[65536];
 749         unsigned int len, i, num_tracks;
 750         unsigned char *p;
 751         int err;
 752
 753         scsi_cmd_init(udev, &sc, header, sizeof(header));
 754         scsi_cmd_set(udev, &sc, 0, 0x43);
 755         scsi_cmd_set(udev, &sc, 6, 1);
 756         scsi_cmd_set(udev, &sc, 8, sizeof(header) & 0xff);
 757         scsi_cmd_set(udev, &sc, 9, 0);
 758         err = scsi_cmd_run(udev, &sc, fd, header, sizeof(header));
 759         if ((err != 0)) {
 760                 info_scsi_cmd_err(udev, "READ TOC", err);
 761                 return -1;
 762         }
 763
 764         len = (header[0] << 8 | header[1]) + 2;
 765         info(udev, "READ TOC: len: %d, start track: %d, end track: %d\n", len, header[2], header[3]);
 766         if (len > sizeof(toc))
 767                 return -1;
 768         if (len < 2)
 769                 return -1;
 770         /* 2: first track, 3: last track */
 771         num_tracks = header[3] - header[2] + 1;
 772
 773         /* empty media has no tracks */
 774         if (len < 8)
 775                 return 0;
 776
 777         scsi_cmd_init(udev, &sc, toc, sizeof(toc));
 778         scsi_cmd_set(udev, &sc, 0, 0x43);
 779         scsi_cmd_set(udev, &sc, 6, header[2]); /* First Track/Session Number */
 780         scsi_cmd_set(udev, &sc, 7, (len >> 8) & 0xff);
 781         scsi_cmd_set(udev, &sc, 8, len & 0xff);
 782         scsi_cmd_set(udev, &sc, 9, 0);
 783         err = scsi_cmd_run(udev, &sc, fd, toc, len);
 784         if ((err != 0)) {
 785                 info_scsi_cmd_err(udev, "READ TOC (tracks)", err);
 786                 return -1;
 787         }
 788
 789         /* Take care to not iterate beyond the last valid track as specified in
 790          * the TOC, but also avoid going beyond the TOC length, just in case
 791          * the last track number is invalidly large */
 792         for (p = toc+4, i = 4; i < len-8 && num_tracks > 0; i += 8, p += 8, --num_tracks) {
 793                 unsigned int block;
 794                 unsigned int is_data_track;
 795
 796                 is_data_track = (p[1] & 0x04) != 0;
 797
 798                 block = p[4] << 24 | p[5] << 16 | p[6] << 8 | p[7];
 799                 info(udev, "track=%u info=0x%x(%s) start_block=%u\n",
 800                      p[2], p[1] & 0x0f, is_data_track ? "data":"audio", block);
 801
 802                 if (is_data_track)
 803                         cd_media_track_count_data++;
 804                 else
 805                         cd_media_track_count_audio++;
 806         }
 807
 808         scsi_cmd_init(udev, &sc, header, sizeof(header));
 809         scsi_cmd_set(udev, &sc, 0, 0x43);
 810         scsi_cmd_set(udev, &sc, 2, 1); /* Session Info */
 811         scsi_cmd_set(udev, &sc, 8, sizeof(header));
 812         scsi_cmd_set(udev, &sc, 9, 0);
 813         err = scsi_cmd_run(udev, &sc, fd, header, sizeof(header));
 814         if ((err != 0)) {
 815                 info_scsi_cmd_err(udev, "READ TOC (multi session)", err);
 816                 return -1;
 817         }
 818         len = header[4+4] << 24 | header[4+5] << 16 | header[4+6] << 8 | header[4+7];
 819         info(udev, "last track %u starts at block %u\n", header[4+2], len);
 820         cd_media_session_last_offset = (unsigned long long int)len * 2048;
 821         return 0;
 822 }
 823
 824 int main(int argc, char *argv[])
 825 {
 826         struct udev *udev;
 827         static const struct option options[] = {
 828                 { "export", no_argument, NULL, 'x' },
 829                 { "debug", no_argument, NULL, 'd' },
 830                 { "help", no_argument, NULL, 'h' },
 831                 {}
 832         };
 833         const char *node = NULL;
 834         int export = 0;
 835         int fd = -1;
 836         int cnt;
 837         int rc = 0;
 838
 839         udev = udev_new();
 840         if (udev == NULL)
 841                 goto exit;
 842
 843         udev_log_init("cdrom_id");
 844         udev_set_log_fn(udev, log_fn);
 845
 846         while (1) {
 847                 int option;
 848
 849                 option = getopt_long(argc, argv, "dxh", options, NULL);
 850                 if (option == -1)
 851                         break;
 852
 853                 switch (option) {
 854                 case 'd':
 855                         debug = 1;
 856                         if (udev_get_log_priority(udev) < LOG_INFO)
 857                                 udev_set_log_priority(udev, LOG_INFO);
 858                         break;
 859                 case 'x':
 860                         export = 1;
 861                         break;
 862                 case 'h':
 863                         printf("Usage: cdrom_id [options] <device>\n"
 864                                "  --export        export key/value pairs\n"
 865                                "  --debug         debug to stderr\n"
 866                                "  --help          print this help text\n\n");
 867                         goto exit;
 868                 default:
 869                         rc = 1;
 870                         goto exit;
 871                 }
 872         }
 873
 874         node = argv[optind];
 875         if (!node) {
 876                 err(udev, "no device\n");
 877                 fprintf(stderr, "no device\n");
 878                 rc = 1;
 879                 goto exit;
 880         }
 881
 882         srand((unsigned int)getpid());
 883         for (cnt = 20; cnt > 0; cnt--) {
 884                 struct timespec duration;
 885
 886                 fd = open(node, O_RDONLY|O_NONBLOCK|(is_mounted(node) ? 0 : O_EXCL));
 887                 if (fd >= 0 || errno != EBUSY)
 888                         break;
 889                 duration.tv_sec = 0;
 890                 duration.tv_nsec = (100 * 1000 * 1000) + (rand() % 100 * 1000 * 1000);
 891                 nanosleep(&duration, NULL);
 892         }
 893         if (fd < 0) {
 894                 info(udev, "unable to open '%s'\n", node);
 895                 fprintf(stderr, "unable to open '%s'\n", node);
 896                 rc = 1;
 897                 goto exit;
 898         }
 899         info(udev, "probing: '%s'\n", node);
 900
 901         /* same data as original cdrom_id */
 902         if (cd_capability_compat(udev, fd) < 0) {
 903                 rc = 1;
 904                 goto exit;
 905         }
 906
 907         /* check for media - don't bail if there's no media as we still need to
 908          * to read profiles */
 909         cd_media_compat(udev, fd);
 910
 911         /* check if drive talks MMC */
 912         if (cd_inquiry(udev, fd) < 0)
 913                 goto print;
 914
 915         /* read drive and possibly current profile */
 916         if (cd_profiles(udev, fd) != 0)
 917                 goto print;
 918
 919         /* at this point we are guaranteed to have media in the
 920          * drive - find out more about it */
 921
 922         /* get session/track info */
 923         cd_media_toc(udev, fd);
 924
 925         /* get writable media state */
 926         cd_media_info(udev, fd);
 927
 928 print:
 929         printf("ID_CDROM=1\n");
 930         if (cd_cd_rom)
 931                 printf("ID_CDROM_CD=1\n");
 932         if (cd_cd_r)
 933                 printf("ID_CDROM_CD_R=1\n");
 934         if (cd_cd_rw)
 935                 printf("ID_CDROM_CD_RW=1\n");
 936         if (cd_dvd_rom)
 937                 printf("ID_CDROM_DVD=1\n");
 938         if (cd_dvd_r)
 939                 printf("ID_CDROM_DVD_R=1\n");
 940         if (cd_dvd_rw)
 941                 printf("ID_CDROM_DVD_RW=1\n");
 942         if (cd_dvd_ram)
 943                 printf("ID_CDROM_DVD_RAM=1\n");
 944         if (cd_dvd_plus_r)
 945                 printf("ID_CDROM_DVD_PLUS_R=1\n");
 946         if (cd_dvd_plus_rw)
 947                 printf("ID_CDROM_DVD_PLUS_RW=1\n");
 948         if (cd_dvd_plus_r_dl)
 949                 printf("ID_CDROM_DVD_PLUS_R_DL=1\n");
 950         if (cd_dvd_plus_rw_dl)
 951                 printf("ID_CDROM_DVD_PLUS_RW_DL=1\n");
 952         if (cd_bd)
 953                 printf("ID_CDROM_BD=1\n");
 954         if (cd_bd_r)
 955                 printf("ID_CDROM_BD_R=1\n");
 956         if (cd_bd_re)
 957                 printf("ID_CDROM_BD_RE=1\n");
 958         if (cd_hddvd)
 959                 printf("ID_CDROM_HDDVD=1\n");
 960         if (cd_hddvd_r)
 961                 printf("ID_CDROM_HDDVD_R=1\n");
 962         if (cd_hddvd_rw)
 963                 printf("ID_CDROM_HDDVD_RW=1\n");
 964         if (cd_mo)
 965                 printf("ID_CDROM_MO=1\n");
 966         if (cd_mrw)
 967                 printf("ID_CDROM_MRW=1\n");
 968         if (cd_mrw_w)
 969                 printf("ID_CDROM_MRW_W=1\n");
 970
 971         if (cd_media)
 972                 printf("ID_CDROM_MEDIA=1\n");
 973         if (cd_media_mo)
 974                 printf("ID_CDROM_MEDIA_MO=1\n");
 975         if (cd_media_mrw)
 976                 printf("ID_CDROM_MEDIA_MRW=1\n");
 977         if (cd_media_mrw_w)
 978                 printf("ID_CDROM_MEDIA_MRW_W=1\n");
 979         if (cd_media_cd_rom)
 980                 printf("ID_CDROM_MEDIA_CD=1\n");
 981         if (cd_media_cd_r)
 982                 printf("ID_CDROM_MEDIA_CD_R=1\n");
 983         if (cd_media_cd_rw)
 984                 printf("ID_CDROM_MEDIA_CD_RW=1\n");
 985         if (cd_media_dvd_rom)
 986                 printf("ID_CDROM_MEDIA_DVD=1\n");
 987         if (cd_media_dvd_r)
 988                 printf("ID_CDROM_MEDIA_DVD_R=1\n");
 989         if (cd_media_dvd_ram)
 990                 printf("ID_CDROM_MEDIA_DVD_RAM=1\n");
 991         if (cd_media_dvd_rw)
 992                 printf("ID_CDROM_MEDIA_DVD_RW=1\n");
 993         if (cd_media_dvd_plus_r)
 994                 printf("ID_CDROM_MEDIA_DVD_PLUS_R=1\n");
 995         if (cd_media_dvd_plus_rw)
 996                 printf("ID_CDROM_MEDIA_DVD_PLUS_RW=1\n");
 997         if (cd_media_dvd_plus_rw_dl)
 998                 printf("ID_CDROM_MEDIA_DVD_PLUS_RW_DL=1\n");
 999         if (cd_media_dvd_plus_r_dl)
1000                 printf("ID_CDROM_MEDIA_DVD_PLUS_R_DL=1\n");
1001         if (cd_media_bd)
1002                 printf("ID_CDROM_MEDIA_BD=1\n");
1003         if (cd_media_bd_r)
1004                 printf("ID_CDROM_MEDIA_BD_R=1\n");
1005         if (cd_media_bd_re)
1006                 printf("ID_CDROM_MEDIA_BD_RE=1\n");
1007         if (cd_media_hddvd)
1008                 printf("ID_CDROM_MEDIA_HDDVD=1\n");
1009         if (cd_media_hddvd_r)
1010                 printf("ID_CDROM_MEDIA_HDDVD_R=1\n");
1011         if (cd_media_hddvd_rw)
1012                 printf("ID_CDROM_MEDIA_HDDVD_RW=1\n");
1013
1014         if (cd_media_state != NULL)
1015                 printf("ID_CDROM_MEDIA_STATE=%s\n", cd_media_state);
1016         if (cd_media_session_next > 0)
1017                 printf("ID_CDROM_MEDIA_SESSION_NEXT=%d\n", cd_media_session_next);
1018         if (cd_media_session_count > 0)
1019                 printf("ID_CDROM_MEDIA_SESSION_COUNT=%d\n", cd_media_session_count);
1020         if (cd_media_session_count > 1 && cd_media_session_last_offset > 0)
1021                 printf("ID_CDROM_MEDIA_SESSION_LAST_OFFSET=%llu\n", cd_media_session_last_offset);
1022         if (cd_media_track_count > 0)
1023                 printf("ID_CDROM_MEDIA_TRACK_COUNT=%d\n", cd_media_track_count);
1024         if (cd_media_track_count_audio > 0)
1025                 printf("ID_CDROM_MEDIA_TRACK_COUNT_AUDIO=%d\n", cd_media_track_count_audio);
1026         if (cd_media_track_count_data > 0)
1027                 printf("ID_CDROM_MEDIA_TRACK_COUNT_DATA=%d\n", cd_media_track_count_data);
1028 exit:
1029         if (fd >= 0)
1030                 close(fd);
1031         udev_unref(udev);
1032         udev_log_close();
1033         return rc;
1034 }
1035