src/udev/cdrom_id/cdrom_id.c

   1 /*
   2  * cdrom_id - optical drive and media information prober
   3  *
   4  * Copyright (C) 2008-2010 Kay Sievers <kay@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 #include <stdio.h>
  21 #include <stddef.h>
  22 #include <stdlib.h>
  23 #include <unistd.h>
  24 #include <string.h>
  25 #include <limits.h>
  26 #include <fcntl.h>
  27 #include <errno.h>
  28 #include <getopt.h>
  29 #include <time.h>
  30 #include <scsi/sg.h>
  31 #include <sys/types.h>
  32 #include <sys/stat.h>
  33 #include <sys/time.h>
  34 #include <sys/ioctl.h>
  35 #include <linux/cdrom.h>
  36
  37 #include "libudev.h"
  38 #include "libudev-private.h"
  39
  40 static bool debug;
  41
  42 static void log_fn(struct udev *udev, int priority,
  43                    const char *file, int line, const char *fn,
  44                    const char *format, va_list args)
  45 {
  46         if (debug) {
  47                 fprintf(stderr, "%s: ", fn);
  48                 vfprintf(stderr, format, args);
  49         } else {
  50                 vsyslog(priority, format, args);
  51         }
  52 }
  53
  54 /* device info */
  55 static unsigned int cd_cd_rom;
  56 static unsigned int cd_cd_r;
  57 static unsigned int cd_cd_rw;
  58 static unsigned int cd_dvd_rom;
  59 static unsigned int cd_dvd_r;
  60 static unsigned int cd_dvd_rw;
  61 static unsigned int cd_dvd_ram;
  62 static unsigned int cd_dvd_plus_r;
  63 static unsigned int cd_dvd_plus_rw;
  64 static unsigned int cd_dvd_plus_r_dl;
  65 static unsigned int cd_dvd_plus_rw_dl;
  66 static unsigned int cd_bd;
  67 static unsigned int cd_bd_r;
  68 static unsigned int cd_bd_re;
  69 static unsigned int cd_hddvd;
  70 static unsigned int cd_hddvd_r;
  71 static unsigned int cd_hddvd_rw;
  72 static unsigned int cd_mo;
  73 static unsigned int cd_mrw;
  74 static unsigned int cd_mrw_w;
  75
  76 /* media info */
  77 static unsigned int cd_media;
  78 static unsigned int cd_media_cd_rom;
  79 static unsigned int cd_media_cd_r;
  80 static unsigned int cd_media_cd_rw;
  81 static unsigned int cd_media_dvd_rom;
  82 static unsigned int cd_media_dvd_r;
  83 static unsigned int cd_media_dvd_rw;
  84 static unsigned int cd_media_dvd_rw_ro; /* restricted overwrite mode */
  85 static unsigned int cd_media_dvd_rw_seq; /* sequential mode */
  86 static unsigned int cd_media_dvd_ram;
  87 static unsigned int cd_media_dvd_plus_r;
  88 static unsigned int cd_media_dvd_plus_rw;
  89 static unsigned int cd_media_dvd_plus_r_dl;
  90 static unsigned int cd_media_dvd_plus_rw_dl;
  91 static unsigned int cd_media_bd;
  92 static unsigned int cd_media_bd_r;
  93 static unsigned int cd_media_bd_re;
  94 static unsigned int cd_media_hddvd;
  95 static unsigned int cd_media_hddvd_r;
  96 static unsigned int cd_media_hddvd_rw;
  97 static unsigned int cd_media_mo;
  98 static unsigned int cd_media_mrw;
  99 static unsigned int cd_media_mrw_w;
 100
 101 static const char *cd_media_state = NULL;
 102 static unsigned int cd_media_session_next;
 103 static unsigned int cd_media_session_count;
 104 static unsigned int cd_media_track_count;
 105 static unsigned int cd_media_track_count_data;
 106 static unsigned int cd_media_track_count_audio;
 107 static unsigned long long int cd_media_session_last_offset;
 108
 109 #define ERRCODE(s)        ((((s)[2] & 0x0F) << 16) | ((s)[12] << 8) | ((s)[13]))
 110 #define SK(errcode)        (((errcode) >> 16) & 0xF)
 111 #define ASC(errcode)        (((errcode) >> 8) & 0xFF)
 112 #define ASCQ(errcode)        ((errcode) & 0xFF)
 113
 114 static bool is_mounted(const char *device)
 115 {
 116         struct stat statbuf;
 117         FILE *fp;
 118         int maj, min;
 119         bool mounted = false;
 120
 121         if (stat(device, &statbuf) < 0)
 122                 return -ENODEV;
 123
 124         fp = fopen("/proc/self/mountinfo", "re");
 125         if (fp == NULL)
 126                 return -ENOSYS;
 127         while (fscanf(fp, "%*s %*s %i:%i %*[^\n]", &maj, &min) == 2) {
 128                 if (makedev(maj, min) == statbuf.st_rdev) {
 129                         mounted = true;
 130                         break;
 131                 }
 132         }
 133         fclose(fp);
 134         return mounted;
 135 }
 136
 137 static void info_scsi_cmd_err(struct udev *udev, const char *cmd, int err)
 138 {
 139         if (err == -1) {
 140                 log_debug("%s failed\n", cmd);
 141                 return;
 142         }
 143         log_debug("%s failed with SK=%Xh/ASC=%02Xh/ACQ=%02Xh\n", cmd, SK(err), ASC(err), ASCQ(err));
 144 }
 145
 146 struct scsi_cmd {
 147         struct cdrom_generic_command cgc;
 148         union {
 149                 struct request_sense s;
 150                 unsigned char u[18];
 151         } _sense;
 152         struct sg_io_hdr sg_io;
 153 };
 154
 155 static void scsi_cmd_init(struct udev *udev, struct scsi_cmd *cmd)
 156 {
 157         memset(cmd, 0x00, sizeof(struct scsi_cmd));
 158         cmd->cgc.quiet = 1;
 159         cmd->cgc.sense = &cmd->_sense.s;
 160         cmd->sg_io.interface_id = 'S';
 161         cmd->sg_io.mx_sb_len = sizeof(cmd->_sense);
 162         cmd->sg_io.cmdp = cmd->cgc.cmd;
 163         cmd->sg_io.sbp = cmd->_sense.u;
 164         cmd->sg_io.flags = SG_FLAG_LUN_INHIBIT | SG_FLAG_DIRECT_IO;
 165 }
 166
 167 static void scsi_cmd_set(struct udev *udev, struct scsi_cmd *cmd, size_t i, unsigned char arg)
 168 {
 169         cmd->sg_io.cmd_len = i + 1;
 170         cmd->cgc.cmd[i] = arg;
 171 }
 172
 173 #define CHECK_CONDITION 0x01
 174
 175 static int scsi_cmd_run(struct udev *udev, struct scsi_cmd *cmd, int fd, unsigned char *buf, size_t bufsize)
 176 {
 177         int ret = 0;
 178
 179         if (bufsize > 0) {
 180                 cmd->sg_io.dxferp = buf;
 181                 cmd->sg_io.dxfer_len = bufsize;
 182                 cmd->sg_io.dxfer_direction = SG_DXFER_FROM_DEV;
 183         } else {
 184                 cmd->sg_io.dxfer_direction = SG_DXFER_NONE;
 185         }
 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 media_lock(struct udev *udev, int fd, bool lock)
 202 {
 203         int err;
 204
 205         /* disable the kernel's lock logic */
 206         err = ioctl(fd, CDROM_CLEAR_OPTIONS, CDO_LOCK);
 207         if (err < 0)
 208                 log_debug("CDROM_CLEAR_OPTIONS, CDO_LOCK failed\n");
 209
 210         err = ioctl(fd, CDROM_LOCKDOOR, lock ? 1 : 0);
 211         if (err < 0)
 212                 log_debug("CDROM_LOCKDOOR failed\n");
 213
 214         return err;
 215 }
 216
 217 static int media_eject(struct udev *udev, int fd)
 218 {
 219         struct scsi_cmd sc;
 220         int err;
 221
 222         scsi_cmd_init(udev, &sc);
 223         scsi_cmd_set(udev, &sc, 0, 0x1b);
 224         scsi_cmd_set(udev, &sc, 4, 0x02);
 225         scsi_cmd_set(udev, &sc, 5, 0);
 226         err = scsi_cmd_run(udev, &sc, fd, NULL, 0);
 227         if ((err != 0)) {
 228                 info_scsi_cmd_err(udev, "START_STOP_UNIT", err);
 229                 return -1;
 230         }
 231         return 0;
 232 }
 233
 234 static int cd_capability_compat(struct udev *udev, int fd)
 235 {
 236         int capability;
 237
 238         capability = ioctl(fd, CDROM_GET_CAPABILITY, NULL);
 239         if (capability < 0) {
 240                 log_debug("CDROM_GET_CAPABILITY failed\n");
 241                 return -1;
 242         }
 243
 244         if (capability & CDC_CD_R)
 245                 cd_cd_r = 1;
 246         if (capability & CDC_CD_RW)
 247                 cd_cd_rw = 1;
 248         if (capability & CDC_DVD)
 249                 cd_dvd_rom = 1;
 250         if (capability & CDC_DVD_R)
 251                 cd_dvd_r = 1;
 252         if (capability & CDC_DVD_RAM)
 253                 cd_dvd_ram = 1;
 254         if (capability & CDC_MRW)
 255                 cd_mrw = 1;
 256         if (capability & CDC_MRW_W)
 257                 cd_mrw_w = 1;
 258         return 0;
 259 }
 260
 261 static int cd_media_compat(struct udev *udev, int fd)
 262 {
 263         if (ioctl(fd, CDROM_DRIVE_STATUS, CDSL_CURRENT) != CDS_DISC_OK) {
 264                 log_debug("CDROM_DRIVE_STATUS != CDS_DISC_OK\n");
 265                 return -1;
 266         }
 267         cd_media = 1;
 268         return 0;
 269 }
 270
 271 static int cd_inquiry(struct udev *udev, int fd)
 272 {
 273         struct scsi_cmd sc;
 274         unsigned char inq[128];
 275         int err;
 276
 277         scsi_cmd_init(udev, &sc);
 278         scsi_cmd_set(udev, &sc, 0, 0x12);
 279         scsi_cmd_set(udev, &sc, 4, 36);
 280         scsi_cmd_set(udev, &sc, 5, 0);
 281         err = scsi_cmd_run(udev, &sc, fd, inq, 36);
 282         if ((err != 0)) {
 283                 info_scsi_cmd_err(udev, "INQUIRY", err);
 284                 return -1;
 285         }
 286
 287         if ((inq[0] & 0x1F) != 5) {
 288                 log_debug("not an MMC unit\n");
 289                 return -1;
 290         }
 291
 292         log_debug("INQUIRY: [%.8s][%.16s][%.4s]\n", inq + 8, inq + 16, inq + 32);
 293         return 0;
 294 }
 295
 296 static void feature_profile_media(struct udev *udev, int cur_profile)
 297 {
 298         switch (cur_profile) {
 299         case 0x03:
 300         case 0x04:
 301         case 0x05:
 302                 log_debug("profile 0x%02x \n", cur_profile);
 303                 cd_media = 1;
 304                 cd_media_mo = 1;
 305                 break;
 306         case 0x08:
 307                 log_debug("profile 0x%02x media_cd_rom\n", cur_profile);
 308                 cd_media = 1;
 309                 cd_media_cd_rom = 1;
 310                 break;
 311         case 0x09:
 312                 log_debug("profile 0x%02x media_cd_r\n", cur_profile);
 313                 cd_media = 1;
 314                 cd_media_cd_r = 1;
 315                 break;
 316         case 0x0a:
 317                 log_debug("profile 0x%02x media_cd_rw\n", cur_profile);
 318                 cd_media = 1;
 319                 cd_media_cd_rw = 1;
 320                 break;
 321         case 0x10:
 322                 log_debug("profile 0x%02x media_dvd_ro\n", cur_profile);
 323                 cd_media = 1;
 324                 cd_media_dvd_rom = 1;
 325                 break;
 326         case 0x11:
 327                 log_debug("profile 0x%02x media_dvd_r\n", cur_profile);
 328                 cd_media = 1;
 329                 cd_media_dvd_r = 1;
 330                 break;
 331         case 0x12:
 332                 log_debug("profile 0x%02x media_dvd_ram\n", cur_profile);
 333                 cd_media = 1;
 334                 cd_media_dvd_ram = 1;
 335                 break;
 336         case 0x13:
 337                 log_debug("profile 0x%02x media_dvd_rw_ro\n", cur_profile);
 338                 cd_media = 1;
 339                 cd_media_dvd_rw = 1;
 340                 cd_media_dvd_rw_ro = 1;
 341                 break;
 342         case 0x14:
 343                 log_debug("profile 0x%02x media_dvd_rw_seq\n", cur_profile);
 344                 cd_media = 1;
 345                 cd_media_dvd_rw = 1;
 346                 cd_media_dvd_rw_seq = 1;
 347                 break;
 348         case 0x1B:
 349                 log_debug("profile 0x%02x media_dvd_plus_r\n", cur_profile);
 350                 cd_media = 1;
 351                 cd_media_dvd_plus_r = 1;
 352                 break;
 353         case 0x1A:
 354                 log_debug("profile 0x%02x media_dvd_plus_rw\n", cur_profile);
 355                 cd_media = 1;
 356                 cd_media_dvd_plus_rw = 1;
 357                 break;
 358         case 0x2A:
 359                 log_debug("profile 0x%02x media_dvd_plus_rw_dl\n", cur_profile);
 360                 cd_media = 1;
 361                 cd_media_dvd_plus_rw_dl = 1;
 362                 break;
 363         case 0x2B:
 364                 log_debug("profile 0x%02x media_dvd_plus_r_dl\n", cur_profile);
 365                 cd_media = 1;
 366                 cd_media_dvd_plus_r_dl = 1;
 367                 break;
 368         case 0x40:
 369                 log_debug("profile 0x%02x media_bd\n", cur_profile);
 370                 cd_media = 1;
 371                 cd_media_bd = 1;
 372                 break;
 373         case 0x41:
 374         case 0x42:
 375                 log_debug("profile 0x%02x media_bd_r\n", cur_profile);
 376                 cd_media = 1;
 377                 cd_media_bd_r = 1;
 378                 break;
 379         case 0x43:
 380                 log_debug("profile 0x%02x media_bd_re\n", cur_profile);
 381                 cd_media = 1;
 382                 cd_media_bd_re = 1;
 383                 break;
 384         case 0x50:
 385                 log_debug("profile 0x%02x media_hddvd\n", cur_profile);
 386                 cd_media = 1;
 387                 cd_media_hddvd = 1;
 388                 break;
 389         case 0x51:
 390                 log_debug("profile 0x%02x media_hddvd_r\n", cur_profile);
 391                 cd_media = 1;
 392                 cd_media_hddvd_r = 1;
 393                 break;
 394         case 0x52:
 395                 log_debug("profile 0x%02x media_hddvd_rw\n", cur_profile);
 396                 cd_media = 1;
 397                 cd_media_hddvd_rw = 1;
 398                 break;
 399         default:
 400                 log_debug("profile 0x%02x <ignored>\n", cur_profile);
 401                 break;
 402         }
 403 }
 404
 405 static int feature_profiles(struct udev *udev, const unsigned char *profiles, size_t size)
 406 {
 407         unsigned int i;
 408
 409         for (i = 0; i+4 <= size; i += 4) {
 410                 int profile;
 411
 412                 profile = profiles[i] << 8 | profiles[i+1];
 413                 switch (profile) {
 414                 case 0x03:
 415                 case 0x04:
 416                 case 0x05:
 417                         log_debug("profile 0x%02x mo\n", profile);
 418                         cd_mo = 1;
 419                         break;
 420                 case 0x08:
 421                         log_debug("profile 0x%02x cd_rom\n", profile);
 422                         cd_cd_rom = 1;
 423                         break;
 424                 case 0x09:
 425                         log_debug("profile 0x%02x cd_r\n", profile);
 426                         cd_cd_r = 1;
 427                         break;
 428                 case 0x0A:
 429                         log_debug("profile 0x%02x cd_rw\n", profile);
 430                         cd_cd_rw = 1;
 431                         break;
 432                 case 0x10:
 433                         log_debug("profile 0x%02x dvd_rom\n", profile);
 434                         cd_dvd_rom = 1;
 435                         break;
 436                 case 0x12:
 437                         log_debug("profile 0x%02x dvd_ram\n", profile);
 438                         cd_dvd_ram = 1;
 439                         break;
 440                 case 0x13:
 441                 case 0x14:
 442                         log_debug("profile 0x%02x dvd_rw\n", profile);
 443                         cd_dvd_rw = 1;
 444                         break;
 445                 case 0x1B:
 446                         log_debug("profile 0x%02x dvd_plus_r\n", profile);
 447                         cd_dvd_plus_r = 1;
 448                         break;
 449                 case 0x1A:
 450                         log_debug("profile 0x%02x dvd_plus_rw\n", profile);
 451                         cd_dvd_plus_rw = 1;
 452                         break;
 453                 case 0x2A:
 454                         log_debug("profile 0x%02x dvd_plus_rw_dl\n", profile);
 455                         cd_dvd_plus_rw_dl = 1;
 456                         break;
 457                 case 0x2B:
 458                         log_debug("profile 0x%02x dvd_plus_r_dl\n", profile);
 459                         cd_dvd_plus_r_dl = 1;
 460                         break;
 461                 case 0x40:
 462                         cd_bd = 1;
 463                         log_debug("profile 0x%02x bd\n", profile);
 464                         break;
 465                 case 0x41:
 466                 case 0x42:
 467                         cd_bd_r = 1;
 468                         log_debug("profile 0x%02x bd_r\n", profile);
 469                         break;
 470                 case 0x43:
 471                         cd_bd_re = 1;
 472                         log_debug("profile 0x%02x bd_re\n", profile);
 473                         break;
 474                 case 0x50:
 475                         cd_hddvd = 1;
 476                         log_debug("profile 0x%02x hddvd\n", profile);
 477                         break;
 478                 case 0x51:
 479                         cd_hddvd_r = 1;
 480                         log_debug("profile 0x%02x hddvd_r\n", profile);
 481                         break;
 482                 case 0x52:
 483                         cd_hddvd_rw = 1;
 484                         log_debug("profile 0x%02x hddvd_rw\n", profile);
 485                         break;
 486                 default:
 487                         log_debug("profile 0x%02x <ignored>\n", profile);
 488                         break;
 489                 }
 490         }
 491         return 0;
 492 }
 493
 494 /* returns 0 if media was detected */
 495 static int cd_profiles_old_mmc(struct udev *udev, int fd)
 496 {
 497         struct scsi_cmd sc;
 498         int err;
 499
 500         unsigned char header[32];
 501
 502         scsi_cmd_init(udev, &sc);
 503         scsi_cmd_set(udev, &sc, 0, 0x51);
 504         scsi_cmd_set(udev, &sc, 8, sizeof(header));
 505         scsi_cmd_set(udev, &sc, 9, 0);
 506         err = scsi_cmd_run(udev, &sc, fd, header, sizeof(header));
 507         if ((err != 0)) {
 508                 info_scsi_cmd_err(udev, "READ DISC INFORMATION", err);
 509                 if (cd_media == 1) {
 510                         log_debug("no current profile, but disc is present; assuming CD-ROM\n");
 511                         cd_media_cd_rom = 1;
 512                         cd_media_track_count = 1;
 513                         cd_media_track_count_data = 1;
 514                         return 0;
 515                 } else {
 516                         log_debug("no current profile, assuming no media\n");
 517                         return -1;
 518                 }
 519         };
 520
 521         cd_media = 1;
 522
 523         if (header[2] & 16) {
 524                 cd_media_cd_rw = 1;
 525                 log_debug("profile 0x0a media_cd_rw\n");
 526         } else if ((header[2] & 3) < 2 && cd_cd_r) {
 527                 cd_media_cd_r = 1;
 528                 log_debug("profile 0x09 media_cd_r\n");
 529         } else {
 530                 cd_media_cd_rom = 1;
 531                 log_debug("profile 0x08 media_cd_rom\n");
 532         }
 533         return 0;
 534 }
 535
 536 /* returns 0 if media was detected */
 537 static int cd_profiles(struct udev *udev, int fd)
 538 {
 539         struct scsi_cmd sc;
 540         unsigned char features[65530];
 541         unsigned int cur_profile = 0;
 542         unsigned int len;
 543         unsigned int i;
 544         int err;
 545         int ret;
 546
 547         ret = -1;
 548
 549         /* First query the current profile */
 550         scsi_cmd_init(udev, &sc);
 551         scsi_cmd_set(udev, &sc, 0, 0x46);
 552         scsi_cmd_set(udev, &sc, 8, 8);
 553         scsi_cmd_set(udev, &sc, 9, 0);
 554         err = scsi_cmd_run(udev, &sc, fd, features, 8);
 555         if ((err != 0)) {
 556                 info_scsi_cmd_err(udev, "GET CONFIGURATION", err);
 557                 /* handle pre-MMC2 drives which do not support GET CONFIGURATION */
 558                 if (SK(err) == 0x5 && ASC(err) == 0x20) {
 559                         log_debug("drive is pre-MMC2 and does not support 46h get configuration command\n");
 560                         log_debug("trying to work around the problem\n");
 561                         ret = cd_profiles_old_mmc(udev, fd);
 562                 }
 563                 goto out;
 564         }
 565
 566         cur_profile = features[6] << 8 | features[7];
 567         if (cur_profile > 0) {
 568                 log_debug("current profile 0x%02x\n", cur_profile);
 569                 feature_profile_media (udev, cur_profile);
 570                 ret = 0; /* we have media */
 571         } else {
 572                 log_debug("no current profile, assuming no media\n");
 573         }
 574
 575         len = features[0] << 24 | features[1] << 16 | features[2] << 8 | features[3];
 576         log_debug("GET CONFIGURATION: size of features buffer 0x%04x\n", len);
 577
 578         if (len > sizeof(features)) {
 579                 log_debug("can not get features in a single query, truncating\n");
 580                 len = sizeof(features);
 581         } else if (len <= 8) {
 582                 len = sizeof(features);
 583         }
 584
 585         /* Now get the full feature buffer */
 586         scsi_cmd_init(udev, &sc);
 587         scsi_cmd_set(udev, &sc, 0, 0x46);
 588         scsi_cmd_set(udev, &sc, 7, ( len >> 8 ) & 0xff);
 589         scsi_cmd_set(udev, &sc, 8, len & 0xff);
 590         scsi_cmd_set(udev, &sc, 9, 0);
 591         err = scsi_cmd_run(udev, &sc, fd, features, len);
 592         if ((err != 0)) {
 593                 info_scsi_cmd_err(udev, "GET CONFIGURATION", err);
 594                 return -1;
 595         }
 596
 597         /* parse the length once more, in case the drive decided to have other features suddenly :) */
 598         len = features[0] << 24 | features[1] << 16 | features[2] << 8 | features[3];
 599         log_debug("GET CONFIGURATION: size of features buffer 0x%04x\n", len);
 600
 601         if (len > sizeof(features)) {
 602                 log_debug("can not get features in a single query, truncating\n");
 603                 len = sizeof(features);
 604         }
 605
 606         /* device features */
 607         for (i = 8; i+4 < len; i += (4 + features[i+3])) {
 608                 unsigned int feature;
 609
 610                 feature = features[i] << 8 | features[i+1];
 611
 612                 switch (feature) {
 613                 case 0x00:
 614                         log_debug("GET CONFIGURATION: feature 'profiles', with %i entries\n", features[i+3] / 4);
 615                         feature_profiles(udev, &features[i]+4, features[i+3]);
 616                         break;
 617                 default:
 618                         log_debug("GET CONFIGURATION: feature 0x%04x <ignored>, with 0x%02x bytes\n", feature, features[i+3]);
 619                         break;
 620                 }
 621         }
 622 out:
 623         return ret;
 624 }
 625
 626 static int cd_media_info(struct udev *udev, int fd)
 627 {
 628         struct scsi_cmd sc;
 629         unsigned char header[32];
 630         static const char *media_status[] = {
 631                 "blank",
 632                 "appendable",
 633                 "complete",
 634                 "other"
 635         };
 636         int err;
 637
 638         scsi_cmd_init(udev, &sc);
 639         scsi_cmd_set(udev, &sc, 0, 0x51);
 640         scsi_cmd_set(udev, &sc, 8, sizeof(header) & 0xff);
 641         scsi_cmd_set(udev, &sc, 9, 0);
 642         err = scsi_cmd_run(udev, &sc, fd, header, sizeof(header));
 643         if ((err != 0)) {
 644                 info_scsi_cmd_err(udev, "READ DISC INFORMATION", err);
 645                 return -1;
 646         };
 647
 648         cd_media = 1;
 649         log_debug("disk type %02x\n", header[8]);
 650         log_debug("hardware reported media status: %s\n", media_status[header[2] & 3]);
 651
 652         /* exclude plain CDROM, some fake cdroms return 0 for "blank" media here */
 653         if (!cd_media_cd_rom)
 654                 cd_media_state = media_status[header[2] & 3];
 655
 656         /* fresh DVD-RW in restricted overwite mode reports itself as
 657          * "appendable"; change it to "blank" to make it consistent with what
 658          * gets reported after blanking, and what userspace expects  */
 659         if (cd_media_dvd_rw_ro && (header[2] & 3) == 1)
 660                 cd_media_state = media_status[0];
 661
 662         /* DVD+RW discs (and DVD-RW in restricted mode) once formatted are
 663          * always "complete", DVD-RAM are "other" or "complete" if the disc is
 664          * write protected; we need to check the contents if it is blank */
 665         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) {
 666                 unsigned char buffer[32 * 2048];
 667                 unsigned char result, len;
 668                 int block, offset;
 669
 670                 if (cd_media_dvd_ram) {
 671                         /* a write protected dvd-ram may report "complete" status */
 672
 673                         unsigned char dvdstruct[8];
 674                         unsigned char format[12];
 675
 676                         scsi_cmd_init(udev, &sc);
 677                         scsi_cmd_set(udev, &sc, 0, 0xAD);
 678                         scsi_cmd_set(udev, &sc, 7, 0xC0);
 679                         scsi_cmd_set(udev, &sc, 9, sizeof(dvdstruct));
 680                         scsi_cmd_set(udev, &sc, 11, 0);
 681                         err = scsi_cmd_run(udev, &sc, fd, dvdstruct, sizeof(dvdstruct));
 682                         if ((err != 0)) {
 683                                 info_scsi_cmd_err(udev, "READ DVD STRUCTURE", err);
 684                                 return -1;
 685                         }
 686                         if (dvdstruct[4] & 0x02) {
 687                                 cd_media_state = media_status[2];
 688                                 log_debug("write-protected DVD-RAM media inserted\n");
 689                                 goto determined;
 690                         }
 691
 692                         /* let's make sure we don't try to read unformatted media */
 693                         scsi_cmd_init(udev, &sc);
 694                         scsi_cmd_set(udev, &sc, 0, 0x23);
 695                         scsi_cmd_set(udev, &sc, 8, sizeof(format));
 696                         scsi_cmd_set(udev, &sc, 9, 0);
 697                         err = scsi_cmd_run(udev, &sc, fd, format, sizeof(format));
 698                         if ((err != 0)) {
 699                                 info_scsi_cmd_err(udev, "READ DVD FORMAT CAPACITIES", err);
 700                                 return -1;
 701                         }
 702
 703                         len = format[3];
 704                         if (len & 7 || len < 16) {
 705                                 log_debug("invalid format capacities length\n");
 706                                 return -1;
 707                         }
 708
 709                         switch(format[8] & 3) {
 710                             case 1:
 711                                 log_debug("unformatted DVD-RAM media inserted\n");
 712                                 /* This means that last format was interrupted
 713                                  * or failed, blank dvd-ram discs are factory
 714                                  * formatted. Take no action here as it takes
 715                                  * quite a while to reformat a dvd-ram and it's
 716                                  * not automatically started */
 717                                 goto determined;
 718
 719                             case 2:
 720                                 log_debug("formatted DVD-RAM media inserted\n");
 721                                 break;
 722
 723                             case 3:
 724                                 cd_media = 0; //return no media
 725                                 log_debug("format capacities returned no media\n");
 726                                 return -1;
 727                         }
 728                 }
 729
 730                 /* Take a closer look at formatted media (unformatted DVD+RW
 731                  * has "blank" status", DVD-RAM was examined earlier) and check
 732                  * for ISO and UDF PVDs or a fs superblock presence and do it
 733                  * in one ioctl (we need just sectors 0 and 16) */
 734                 scsi_cmd_init(udev, &sc);
 735                 scsi_cmd_set(udev, &sc, 0, 0x28);
 736                 scsi_cmd_set(udev, &sc, 5, 0);
 737                 scsi_cmd_set(udev, &sc, 8, 32);
 738                 scsi_cmd_set(udev, &sc, 9, 0);
 739                 err = scsi_cmd_run(udev, &sc, fd, buffer, sizeof(buffer));
 740                 if ((err != 0)) {
 741                         cd_media = 0;
 742                         info_scsi_cmd_err(udev, "READ FIRST 32 BLOCKS", err);
 743                         return -1;
 744                 }
 745
 746                 /* if any non-zero data is found in sector 16 (iso and udf) or
 747                  * eventually 0 (fat32 boot sector, ext2 superblock, etc), disc
 748                  * is assumed non-blank */
 749                 result = 0;
 750
 751                 for (block = 32768; block >= 0 && !result; block -= 32768) {
 752                         offset = block;
 753                         while (offset < (block + 2048) && !result) {
 754                                 result = buffer [offset];
 755                                 offset++;
 756                         }
 757                 }
 758
 759                 if (!result) {
 760                         cd_media_state = media_status[0];
 761                         log_debug("no data in blocks 0 or 16, assuming blank\n");
 762                 } else {
 763                         log_debug("data in blocks 0 or 16, assuming complete\n");
 764                 }
 765         }
 766
 767 determined:
 768         /* "other" is e. g. DVD-RAM, can't append sessions there; DVDs in
 769          * restricted overwrite mode can never append, only in sequential mode */
 770         if ((header[2] & 3) < 2 && !cd_media_dvd_rw_ro)
 771                 cd_media_session_next = header[10] << 8 | header[5];
 772         cd_media_session_count = header[9] << 8 | header[4];
 773         cd_media_track_count = header[11] << 8 | header[6];
 774
 775         return 0;
 776 }
 777
 778 static int cd_media_toc(struct udev *udev, int fd)
 779 {
 780         struct scsi_cmd sc;
 781         unsigned char header[12];
 782         unsigned char toc[65536];
 783         unsigned int len, i, num_tracks;
 784         unsigned char *p;
 785         int err;
 786
 787         scsi_cmd_init(udev, &sc);
 788         scsi_cmd_set(udev, &sc, 0, 0x43);
 789         scsi_cmd_set(udev, &sc, 6, 1);
 790         scsi_cmd_set(udev, &sc, 8, sizeof(header) & 0xff);
 791         scsi_cmd_set(udev, &sc, 9, 0);
 792         err = scsi_cmd_run(udev, &sc, fd, header, sizeof(header));
 793         if ((err != 0)) {
 794                 info_scsi_cmd_err(udev, "READ TOC", err);
 795                 return -1;
 796         }
 797
 798         len = (header[0] << 8 | header[1]) + 2;
 799         log_debug("READ TOC: len: %d, start track: %d, end track: %d\n", len, header[2], header[3]);
 800         if (len > sizeof(toc))
 801                 return -1;
 802         if (len < 2)
 803                 return -1;
 804         /* 2: first track, 3: last track */
 805         num_tracks = header[3] - header[2] + 1;
 806
 807         /* empty media has no tracks */
 808         if (len < 8)
 809                 return 0;
 810
 811         scsi_cmd_init(udev, &sc);
 812         scsi_cmd_set(udev, &sc, 0, 0x43);
 813         scsi_cmd_set(udev, &sc, 6, header[2]); /* First Track/Session Number */
 814         scsi_cmd_set(udev, &sc, 7, (len >> 8) & 0xff);
 815         scsi_cmd_set(udev, &sc, 8, len & 0xff);
 816         scsi_cmd_set(udev, &sc, 9, 0);
 817         err = scsi_cmd_run(udev, &sc, fd, toc, len);
 818         if ((err != 0)) {
 819                 info_scsi_cmd_err(udev, "READ TOC (tracks)", err);
 820                 return -1;
 821         }
 822
 823         /* Take care to not iterate beyond the last valid track as specified in
 824          * the TOC, but also avoid going beyond the TOC length, just in case
 825          * the last track number is invalidly large */
 826         for (p = toc+4, i = 4; i < len-8 && num_tracks > 0; i += 8, p += 8, --num_tracks) {
 827                 unsigned int block;
 828                 unsigned int is_data_track;
 829
 830                 is_data_track = (p[1] & 0x04) != 0;
 831
 832                 block = p[4] << 24 | p[5] << 16 | p[6] << 8 | p[7];
 833                 log_debug("track=%u info=0x%x(%s) start_block=%u\n",
 834                      p[2], p[1] & 0x0f, is_data_track ? "data":"audio", block);
 835
 836                 if (is_data_track)
 837                         cd_media_track_count_data++;
 838                 else
 839                         cd_media_track_count_audio++;
 840         }
 841
 842         scsi_cmd_init(udev, &sc);
 843         scsi_cmd_set(udev, &sc, 0, 0x43);
 844         scsi_cmd_set(udev, &sc, 2, 1); /* Session Info */
 845         scsi_cmd_set(udev, &sc, 8, sizeof(header));
 846         scsi_cmd_set(udev, &sc, 9, 0);
 847         err = scsi_cmd_run(udev, &sc, fd, header, sizeof(header));
 848         if ((err != 0)) {
 849                 info_scsi_cmd_err(udev, "READ TOC (multi session)", err);
 850                 return -1;
 851         }
 852         len = header[4+4] << 24 | header[4+5] << 16 | header[4+6] << 8 | header[4+7];
 853         log_debug("last track %u starts at block %u\n", header[4+2], len);
 854         cd_media_session_last_offset = (unsigned long long int)len * 2048;
 855         return 0;
 856 }
 857
 858 int main(int argc, char *argv[])
 859 {
 860         struct udev *udev;
 861         static const struct option options[] = {
 862                 { "lock-media", no_argument, NULL, 'l' },
 863                 { "unlock-media", no_argument, NULL, 'u' },
 864                 { "eject-media", no_argument, NULL, 'e' },
 865                 { "debug", no_argument, NULL, 'd' },
 866                 { "help", no_argument, NULL, 'h' },
 867                 {}
 868         };
 869         bool eject = false;
 870         bool lock = false;
 871         bool unlock = false;
 872         const char *node = NULL;
 873         int fd = -1;
 874         int cnt;
 875         int rc = 0;
 876
 877         udev = udev_new();
 878         if (udev == NULL)
 879                 goto exit;
 880
 881         log_open();
 882         udev_set_log_fn(udev, log_fn);
 883
 884         while (1) {
 885                 int option;
 886
 887                 option = getopt_long(argc, argv, "deluh", options, NULL);
 888                 if (option == -1)
 889                         break;
 890
 891                 switch (option) {
 892                 case 'l':
 893                         lock = true;
 894                         break;
 895                 case 'u':
 896                         unlock = true;
 897                         break;
 898                 case 'e':
 899                         eject = true;
 900                         break;
 901                 case 'd':
 902                         debug = true;
 903                         log_set_max_level(LOG_DEBUG);
 904                         udev_set_log_priority(udev, LOG_DEBUG);
 905                         break;
 906                 case 'h':
 907                         printf("Usage: cdrom_id [options] <device>\n"
 908                                "  --lock-media    lock the media (to enable eject request events)\n"
 909                                "  --unlock-media  unlock the media\n"
 910                                "  --eject-media   eject the media\n"
 911                                "  --debug         debug to stderr\n"
 912                                "  --help          print this help text\n\n");
 913                         goto exit;
 914                 default:
 915                         rc = 1;
 916                         goto exit;
 917                 }
 918         }
 919
 920         node = argv[optind];
 921         if (!node) {
 922                 log_error("no device\n");
 923                 fprintf(stderr, "no device\n");
 924                 rc = 1;
 925                 goto exit;
 926         }
 927
 928         srand((unsigned int)getpid());
 929         for (cnt = 20; cnt > 0; cnt--) {
 930                 struct timespec duration;
 931
 932                 fd = open(node, O_RDONLY|O_NONBLOCK|(is_mounted(node) ? 0 : O_EXCL));
 933                 if (fd >= 0 || errno != EBUSY)
 934                         break;
 935                 duration.tv_sec = 0;
 936                 duration.tv_nsec = (100 * 1000 * 1000) + (rand() % 100 * 1000 * 1000);
 937                 nanosleep(&duration, NULL);
 938         }
 939         if (fd < 0) {
 940                 log_debug("unable to open '%s'\n", node);
 941                 fprintf(stderr, "unable to open '%s'\n", node);
 942                 rc = 1;
 943                 goto exit;
 944         }
 945         log_debug("probing: '%s'\n", node);
 946
 947         /* same data as original cdrom_id */
 948         if (cd_capability_compat(udev, fd) < 0) {
 949                 rc = 1;
 950                 goto exit;
 951         }
 952
 953         /* check for media - don't bail if there's no media as we still need to
 954          * to read profiles */
 955         cd_media_compat(udev, fd);
 956
 957         /* check if drive talks MMC */
 958         if (cd_inquiry(udev, fd) < 0)
 959                 goto work;
 960
 961         /* read drive and possibly current profile */
 962         if (cd_profiles(udev, fd) != 0)
 963                 goto work;
 964
 965         /* at this point we are guaranteed to have media in the drive - find out more about it */
 966
 967         /* get session/track info */
 968         cd_media_toc(udev, fd);
 969
 970         /* get writable media state */
 971         cd_media_info(udev, fd);
 972
 973 work:
 974         /* lock the media, so we enable eject button events */
 975         if (lock && cd_media) {
 976                 log_debug("PREVENT_ALLOW_MEDIUM_REMOVAL (lock)\n");
 977                 media_lock(udev, fd, true);
 978         }
 979
 980         if (unlock && cd_media) {
 981                 log_debug("PREVENT_ALLOW_MEDIUM_REMOVAL (unlock)\n");
 982                 media_lock(udev, fd, false);
 983         }
 984
 985         if (eject) {
 986                 log_debug("PREVENT_ALLOW_MEDIUM_REMOVAL (unlock)\n");
 987                 media_lock(udev, fd, false);
 988                 log_debug("START_STOP_UNIT (eject)\n");
 989                 media_eject(udev, fd);
 990         }
 991
 992         printf("ID_CDROM=1\n");
 993         if (cd_cd_rom)
 994                 printf("ID_CDROM_CD=1\n");
 995         if (cd_cd_r)
 996                 printf("ID_CDROM_CD_R=1\n");
 997         if (cd_cd_rw)
 998                 printf("ID_CDROM_CD_RW=1\n");
 999         if (cd_dvd_rom)
1000                 printf("ID_CDROM_DVD=1\n");
1001         if (cd_dvd_r)
1002                 printf("ID_CDROM_DVD_R=1\n");
1003         if (cd_dvd_rw)
1004                 printf("ID_CDROM_DVD_RW=1\n");
1005         if (cd_dvd_ram)
1006                 printf("ID_CDROM_DVD_RAM=1\n");
1007         if (cd_dvd_plus_r)
1008                 printf("ID_CDROM_DVD_PLUS_R=1\n");
1009         if (cd_dvd_plus_rw)
1010                 printf("ID_CDROM_DVD_PLUS_RW=1\n");
1011         if (cd_dvd_plus_r_dl)
1012                 printf("ID_CDROM_DVD_PLUS_R_DL=1\n");
1013         if (cd_dvd_plus_rw_dl)
1014                 printf("ID_CDROM_DVD_PLUS_RW_DL=1\n");
1015         if (cd_bd)
1016                 printf("ID_CDROM_BD=1\n");
1017         if (cd_bd_r)
1018                 printf("ID_CDROM_BD_R=1\n");
1019         if (cd_bd_re)
1020                 printf("ID_CDROM_BD_RE=1\n");
1021         if (cd_hddvd)
1022                 printf("ID_CDROM_HDDVD=1\n");
1023         if (cd_hddvd_r)
1024                 printf("ID_CDROM_HDDVD_R=1\n");
1025         if (cd_hddvd_rw)
1026                 printf("ID_CDROM_HDDVD_RW=1\n");
1027         if (cd_mo)
1028                 printf("ID_CDROM_MO=1\n");
1029         if (cd_mrw)
1030                 printf("ID_CDROM_MRW=1\n");
1031         if (cd_mrw_w)
1032                 printf("ID_CDROM_MRW_W=1\n");
1033
1034         if (cd_media)
1035                 printf("ID_CDROM_MEDIA=1\n");
1036         if (cd_media_mo)
1037                 printf("ID_CDROM_MEDIA_MO=1\n");
1038         if (cd_media_mrw)
1039                 printf("ID_CDROM_MEDIA_MRW=1\n");
1040         if (cd_media_mrw_w)
1041                 printf("ID_CDROM_MEDIA_MRW_W=1\n");
1042         if (cd_media_cd_rom)
1043                 printf("ID_CDROM_MEDIA_CD=1\n");
1044         if (cd_media_cd_r)
1045                 printf("ID_CDROM_MEDIA_CD_R=1\n");
1046         if (cd_media_cd_rw)
1047                 printf("ID_CDROM_MEDIA_CD_RW=1\n");
1048         if (cd_media_dvd_rom)
1049                 printf("ID_CDROM_MEDIA_DVD=1\n");
1050         if (cd_media_dvd_r)
1051                 printf("ID_CDROM_MEDIA_DVD_R=1\n");
1052         if (cd_media_dvd_ram)
1053                 printf("ID_CDROM_MEDIA_DVD_RAM=1\n");
1054         if (cd_media_dvd_rw)
1055                 printf("ID_CDROM_MEDIA_DVD_RW=1\n");
1056         if (cd_media_dvd_plus_r)
1057                 printf("ID_CDROM_MEDIA_DVD_PLUS_R=1\n");
1058         if (cd_media_dvd_plus_rw)
1059                 printf("ID_CDROM_MEDIA_DVD_PLUS_RW=1\n");
1060         if (cd_media_dvd_plus_rw_dl)
1061                 printf("ID_CDROM_MEDIA_DVD_PLUS_RW_DL=1\n");
1062         if (cd_media_dvd_plus_r_dl)
1063                 printf("ID_CDROM_MEDIA_DVD_PLUS_R_DL=1\n");
1064         if (cd_media_bd)
1065                 printf("ID_CDROM_MEDIA_BD=1\n");
1066         if (cd_media_bd_r)
1067                 printf("ID_CDROM_MEDIA_BD_R=1\n");
1068         if (cd_media_bd_re)
1069                 printf("ID_CDROM_MEDIA_BD_RE=1\n");
1070         if (cd_media_hddvd)
1071                 printf("ID_CDROM_MEDIA_HDDVD=1\n");
1072         if (cd_media_hddvd_r)
1073                 printf("ID_CDROM_MEDIA_HDDVD_R=1\n");
1074         if (cd_media_hddvd_rw)
1075                 printf("ID_CDROM_MEDIA_HDDVD_RW=1\n");
1076
1077         if (cd_media_state != NULL)
1078                 printf("ID_CDROM_MEDIA_STATE=%s\n", cd_media_state);
1079         if (cd_media_session_next > 0)
1080                 printf("ID_CDROM_MEDIA_SESSION_NEXT=%d\n", cd_media_session_next);
1081         if (cd_media_session_count > 0)
1082                 printf("ID_CDROM_MEDIA_SESSION_COUNT=%d\n", cd_media_session_count);
1083         if (cd_media_session_count > 1 && cd_media_session_last_offset > 0)
1084                 printf("ID_CDROM_MEDIA_SESSION_LAST_OFFSET=%llu\n", cd_media_session_last_offset);
1085         if (cd_media_track_count > 0)
1086                 printf("ID_CDROM_MEDIA_TRACK_COUNT=%d\n", cd_media_track_count);
1087         if (cd_media_track_count_audio > 0)
1088                 printf("ID_CDROM_MEDIA_TRACK_COUNT_AUDIO=%d\n", cd_media_track_count_audio);
1089         if (cd_media_track_count_data > 0)
1090                 printf("ID_CDROM_MEDIA_TRACK_COUNT_DATA=%d\n", cd_media_track_count_data);
1091 exit:
1092         if (fd >= 0)
1093                 close(fd);
1094         udev_unref(udev);
1095         log_close();
1096         return rc;
1097 }