src/udev/cdrom_id/cdrom_id.c

   1 /* SPDX-License-Identifier: GPL-2.0+ */
   2 /*
   3  * cdrom_id - optical drive and media information prober
   4  *
   5  * Copyright (C) 2008-2010 Kay Sievers <kay@vrfy.org>
   6  *
   7  * This program is free software: you can redistribute it and/or modify
   8  * it under the terms of the GNU General Public License as published by
   9  * the Free Software Foundation, either version 2 of the License, or
  10  * (at your option) any later version.
  11  *
  12  * This program is distributed in the hope that it will be useful,
  13  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  14  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  15  * GNU General Public License for more details.
  16  *
  17  * You should have received a copy of the GNU General Public License
  18  * along with this program.  If not, see <http://www.gnu.org/licenses/>.
  19  */
  20
  21 #include <errno.h>
  22 #include <fcntl.h>
  23 #include <getopt.h>
  24 #include <limits.h>
  25 #include <linux/cdrom.h>
  26 #include <scsi/sg.h>
  27 #include <stddef.h>
  28 #include <stdio.h>
  29 #include <stdlib.h>
  30 #include <string.h>
  31 #include <sys/ioctl.h>
  32 #include <sys/stat.h>
  33 #include <sys/time.h>
  34 #include <sys/types.h>
  35 #include <time.h>
  36 #include <unistd.h>
  37
  38 #include "libudev.h"
  39
  40 #include "libudev-private.h"
  41 #include "random-util.h"
  42 #include "udev-util.h"
  43
  44 /* device info */
  45 static unsigned int cd_cd_rom;
  46 static unsigned int cd_cd_r;
  47 static unsigned int cd_cd_rw;
  48 static unsigned int cd_dvd_rom;
  49 static unsigned int cd_dvd_r;
  50 static unsigned int cd_dvd_rw;
  51 static unsigned int cd_dvd_ram;
  52 static unsigned int cd_dvd_plus_r;
  53 static unsigned int cd_dvd_plus_rw;
  54 static unsigned int cd_dvd_plus_r_dl;
  55 static unsigned int cd_dvd_plus_rw_dl;
  56 static unsigned int cd_bd;
  57 static unsigned int cd_bd_r;
  58 static unsigned int cd_bd_re;
  59 static unsigned int cd_hddvd;
  60 static unsigned int cd_hddvd_r;
  61 static unsigned int cd_hddvd_rw;
  62 static unsigned int cd_mo;
  63 static unsigned int cd_mrw;
  64 static unsigned int cd_mrw_w;
  65
  66 /* media info */
  67 static unsigned int cd_media;
  68 static unsigned int cd_media_cd_rom;
  69 static unsigned int cd_media_cd_r;
  70 static unsigned int cd_media_cd_rw;
  71 static unsigned int cd_media_dvd_rom;
  72 static unsigned int cd_media_dvd_r;
  73 static unsigned int cd_media_dvd_rw;
  74 static unsigned int cd_media_dvd_rw_ro; /* restricted overwrite mode */
  75 static unsigned int cd_media_dvd_rw_seq; /* sequential mode */
  76 static unsigned int cd_media_dvd_ram;
  77 static unsigned int cd_media_dvd_plus_r;
  78 static unsigned int cd_media_dvd_plus_rw;
  79 static unsigned int cd_media_dvd_plus_r_dl;
  80 static unsigned int cd_media_dvd_plus_rw_dl;
  81 static unsigned int cd_media_bd;
  82 static unsigned int cd_media_bd_r;
  83 static unsigned int cd_media_bd_re;
  84 static unsigned int cd_media_hddvd;
  85 static unsigned int cd_media_hddvd_r;
  86 static unsigned int cd_media_hddvd_rw;
  87 static unsigned int cd_media_mo;
  88 static unsigned int cd_media_mrw;
  89 static unsigned int cd_media_mrw_w;
  90
  91 static const char *cd_media_state = NULL;
  92 static unsigned int cd_media_session_next;
  93 static unsigned int cd_media_session_count;
  94 static unsigned int cd_media_track_count;
  95 static unsigned int cd_media_track_count_data;
  96 static unsigned int cd_media_track_count_audio;
  97 static unsigned long long int cd_media_session_last_offset;
  98
  99 #define ERRCODE(s)        ((((s)[2] & 0x0F) << 16) | ((s)[12] << 8) | ((s)[13]))
 100 #define SK(errcode)        (((errcode) >> 16) & 0xF)
 101 #define ASC(errcode)        (((errcode) >> 8) & 0xFF)
 102 #define ASCQ(errcode)        ((errcode) & 0xFF)
 103
 104 static bool is_mounted(const char *device)
 105 {
 106         struct stat statbuf;
 107         FILE *fp;
 108         int maj, min;
 109         bool mounted = false;
 110
 111         if (stat(device, &statbuf) < 0)
 112                 return false;
 113
 114         fp = fopen("/proc/self/mountinfo", "re");
 115         if (fp == NULL)
 116                 return false;
 117         while (fscanf(fp, "%*s %*s %i:%i %*[^\n]", &maj, &min) == 2) {
 118                 if (makedev(maj, min) == statbuf.st_rdev) {
 119                         mounted = true;
 120                         break;
 121                 }
 122         }
 123         fclose(fp);
 124         return mounted;
 125 }
 126
 127 static void info_scsi_cmd_err(struct udev *udev, const char *cmd, int err)
 128 {
 129         if (err == -1) {
 130                 log_debug("%s failed", cmd);
 131                 return;
 132         }
 133         log_debug("%s failed with SK=%Xh/ASC=%02Xh/ACQ=%02Xh", cmd, SK(err), ASC(err), ASCQ(err));
 134 }
 135
 136 struct scsi_cmd {
 137         struct cdrom_generic_command cgc;
 138         union {
 139                 struct request_sense s;
 140                 unsigned char u[18];
 141         } _sense;
 142         struct sg_io_hdr sg_io;
 143 };
 144
 145 static void scsi_cmd_init(struct udev *udev, struct scsi_cmd *cmd)
 146 {
 147         memzero(cmd, sizeof(struct scsi_cmd));
 148         cmd->cgc.quiet = 1;
 149         cmd->cgc.sense = &cmd->_sense.s;
 150         cmd->sg_io.interface_id = 'S';
 151         cmd->sg_io.mx_sb_len = sizeof(cmd->_sense);
 152         cmd->sg_io.cmdp = cmd->cgc.cmd;
 153         cmd->sg_io.sbp = cmd->_sense.u;
 154         cmd->sg_io.flags = SG_FLAG_LUN_INHIBIT | SG_FLAG_DIRECT_IO;
 155 }
 156
 157 static void scsi_cmd_set(struct udev *udev, struct scsi_cmd *cmd, size_t i, unsigned char arg)
 158 {
 159         cmd->sg_io.cmd_len = i + 1;
 160         cmd->cgc.cmd[i] = arg;
 161 }
 162
 163 #define CHECK_CONDITION 0x01
 164
 165 static int scsi_cmd_run(struct udev *udev, struct scsi_cmd *cmd, int fd, unsigned char *buf, size_t bufsize)
 166 {
 167         int ret = 0;
 168
 169         if (bufsize > 0) {
 170                 cmd->sg_io.dxferp = buf;
 171                 cmd->sg_io.dxfer_len = bufsize;
 172                 cmd->sg_io.dxfer_direction = SG_DXFER_FROM_DEV;
 173         } else {
 174                 cmd->sg_io.dxfer_direction = SG_DXFER_NONE;
 175         }
 176         if (ioctl(fd, SG_IO, &cmd->sg_io))
 177                 return -1;
 178
 179         if ((cmd->sg_io.info & SG_INFO_OK_MASK) != SG_INFO_OK) {
 180                 errno = EIO;
 181                 ret = -1;
 182                 if (cmd->sg_io.masked_status & CHECK_CONDITION) {
 183                         ret = ERRCODE(cmd->_sense.u);
 184                         if (ret == 0)
 185                                 ret = -1;
 186                 }
 187         }
 188         return ret;
 189 }
 190
 191 static int media_lock(struct udev *udev, int fd, bool lock)
 192 {
 193         int err;
 194
 195         /* disable the kernel's lock logic */
 196         err = ioctl(fd, CDROM_CLEAR_OPTIONS, CDO_LOCK);
 197         if (err < 0)
 198                 log_debug("CDROM_CLEAR_OPTIONS, CDO_LOCK failed");
 199
 200         err = ioctl(fd, CDROM_LOCKDOOR, lock ? 1 : 0);
 201         if (err < 0)
 202                 log_debug("CDROM_LOCKDOOR failed");
 203
 204         return err;
 205 }
 206
 207 static int media_eject(struct udev *udev, int fd)
 208 {
 209         struct scsi_cmd sc;
 210         int err;
 211
 212         scsi_cmd_init(udev, &sc);
 213         scsi_cmd_set(udev, &sc, 0, 0x1b);
 214         scsi_cmd_set(udev, &sc, 4, 0x02);
 215         scsi_cmd_set(udev, &sc, 5, 0);
 216         err = scsi_cmd_run(udev, &sc, fd, NULL, 0);
 217         if ((err != 0)) {
 218                 info_scsi_cmd_err(udev, "START_STOP_UNIT", err);
 219                 return -1;
 220         }
 221         return 0;
 222 }
 223
 224 static int cd_capability_compat(struct udev *udev, int fd)
 225 {
 226         int capability;
 227
 228         capability = ioctl(fd, CDROM_GET_CAPABILITY, NULL);
 229         if (capability < 0) {
 230                 log_debug("CDROM_GET_CAPABILITY failed");
 231                 return -1;
 232         }
 233
 234         if (capability & CDC_CD_R)
 235                 cd_cd_r = 1;
 236         if (capability & CDC_CD_RW)
 237                 cd_cd_rw = 1;
 238         if (capability & CDC_DVD)
 239                 cd_dvd_rom = 1;
 240         if (capability & CDC_DVD_R)
 241                 cd_dvd_r = 1;
 242         if (capability & CDC_DVD_RAM)
 243                 cd_dvd_ram = 1;
 244         if (capability & CDC_MRW)
 245                 cd_mrw = 1;
 246         if (capability & CDC_MRW_W)
 247                 cd_mrw_w = 1;
 248         return 0;
 249 }
 250
 251 static int cd_media_compat(struct udev *udev, int fd)
 252 {
 253         if (ioctl(fd, CDROM_DRIVE_STATUS, CDSL_CURRENT) != CDS_DISC_OK) {
 254                 log_debug("CDROM_DRIVE_STATUS != CDS_DISC_OK");
 255                 return -1;
 256         }
 257         cd_media = 1;
 258         return 0;
 259 }
 260
 261 static int cd_inquiry(struct udev *udev, int fd)
 262 {
 263         struct scsi_cmd sc;
 264         unsigned char inq[128];
 265         int err;
 266
 267         scsi_cmd_init(udev, &sc);
 268         scsi_cmd_set(udev, &sc, 0, 0x12);
 269         scsi_cmd_set(udev, &sc, 4, 36);
 270         scsi_cmd_set(udev, &sc, 5, 0);
 271         err = scsi_cmd_run(udev, &sc, fd, inq, 36);
 272         if ((err != 0)) {
 273                 info_scsi_cmd_err(udev, "INQUIRY", err);
 274                 return -1;
 275         }
 276
 277         if ((inq[0] & 0x1F) != 5) {
 278                 log_debug("not an MMC unit");
 279                 return -1;
 280         }
 281
 282         log_debug("INQUIRY: [%.8s][%.16s][%.4s]", inq + 8, inq + 16, inq + 32);
 283         return 0;
 284 }
 285
 286 static void feature_profile_media(struct udev *udev, int cur_profile)
 287 {
 288         switch (cur_profile) {
 289         case 0x03:
 290         case 0x04:
 291         case 0x05:
 292                 log_debug("profile 0x%02x ", cur_profile);
 293                 cd_media = 1;
 294                 cd_media_mo = 1;
 295                 break;
 296         case 0x08:
 297                 log_debug("profile 0x%02x media_cd_rom", cur_profile);
 298                 cd_media = 1;
 299                 cd_media_cd_rom = 1;
 300                 break;
 301         case 0x09:
 302                 log_debug("profile 0x%02x media_cd_r", cur_profile);
 303                 cd_media = 1;
 304                 cd_media_cd_r = 1;
 305                 break;
 306         case 0x0a:
 307                 log_debug("profile 0x%02x media_cd_rw", cur_profile);
 308                 cd_media = 1;
 309                 cd_media_cd_rw = 1;
 310                 break;
 311         case 0x10:
 312                 log_debug("profile 0x%02x media_dvd_ro", cur_profile);
 313                 cd_media = 1;
 314                 cd_media_dvd_rom = 1;
 315                 break;
 316         case 0x11:
 317                 log_debug("profile 0x%02x media_dvd_r", cur_profile);
 318                 cd_media = 1;
 319                 cd_media_dvd_r = 1;
 320                 break;
 321         case 0x12:
 322                 log_debug("profile 0x%02x media_dvd_ram", cur_profile);
 323                 cd_media = 1;
 324                 cd_media_dvd_ram = 1;
 325                 break;
 326         case 0x13:
 327                 log_debug("profile 0x%02x media_dvd_rw_ro", cur_profile);
 328                 cd_media = 1;
 329                 cd_media_dvd_rw = 1;
 330                 cd_media_dvd_rw_ro = 1;
 331                 break;
 332         case 0x14:
 333                 log_debug("profile 0x%02x media_dvd_rw_seq", cur_profile);
 334                 cd_media = 1;
 335                 cd_media_dvd_rw = 1;
 336                 cd_media_dvd_rw_seq = 1;
 337                 break;
 338         case 0x1B:
 339                 log_debug("profile 0x%02x media_dvd_plus_r", cur_profile);
 340                 cd_media = 1;
 341                 cd_media_dvd_plus_r = 1;
 342                 break;
 343         case 0x1A:
 344                 log_debug("profile 0x%02x media_dvd_plus_rw", cur_profile);
 345                 cd_media = 1;
 346                 cd_media_dvd_plus_rw = 1;
 347                 break;
 348         case 0x2A:
 349                 log_debug("profile 0x%02x media_dvd_plus_rw_dl", cur_profile);
 350                 cd_media = 1;
 351                 cd_media_dvd_plus_rw_dl = 1;
 352                 break;
 353         case 0x2B:
 354                 log_debug("profile 0x%02x media_dvd_plus_r_dl", cur_profile);
 355                 cd_media = 1;
 356                 cd_media_dvd_plus_r_dl = 1;
 357                 break;
 358         case 0x40:
 359                 log_debug("profile 0x%02x media_bd", cur_profile);
 360                 cd_media = 1;
 361                 cd_media_bd = 1;
 362                 break;
 363         case 0x41:
 364         case 0x42:
 365                 log_debug("profile 0x%02x media_bd_r", cur_profile);
 366                 cd_media = 1;
 367                 cd_media_bd_r = 1;
 368                 break;
 369         case 0x43:
 370                 log_debug("profile 0x%02x media_bd_re", cur_profile);
 371                 cd_media = 1;
 372                 cd_media_bd_re = 1;
 373                 break;
 374         case 0x50:
 375                 log_debug("profile 0x%02x media_hddvd", cur_profile);
 376                 cd_media = 1;
 377                 cd_media_hddvd = 1;
 378                 break;
 379         case 0x51:
 380                 log_debug("profile 0x%02x media_hddvd_r", cur_profile);
 381                 cd_media = 1;
 382                 cd_media_hddvd_r = 1;
 383                 break;
 384         case 0x52:
 385                 log_debug("profile 0x%02x media_hddvd_rw", cur_profile);
 386                 cd_media = 1;
 387                 cd_media_hddvd_rw = 1;
 388                 break;
 389         default:
 390                 log_debug("profile 0x%02x <ignored>", cur_profile);
 391                 break;
 392         }
 393 }
 394
 395 static int feature_profiles(struct udev *udev, const unsigned char *profiles, size_t size)
 396 {
 397         unsigned int i;
 398
 399         for (i = 0; i+4 <= size; i += 4) {
 400                 int profile;
 401
 402                 profile = profiles[i] << 8 | profiles[i+1];
 403                 switch (profile) {
 404                 case 0x03:
 405                 case 0x04:
 406                 case 0x05:
 407                         log_debug("profile 0x%02x mo", profile);
 408                         cd_mo = 1;
 409                         break;
 410                 case 0x08:
 411                         log_debug("profile 0x%02x cd_rom", profile);
 412                         cd_cd_rom = 1;
 413                         break;
 414                 case 0x09:
 415                         log_debug("profile 0x%02x cd_r", profile);
 416                         cd_cd_r = 1;
 417                         break;
 418                 case 0x0A:
 419                         log_debug("profile 0x%02x cd_rw", profile);
 420                         cd_cd_rw = 1;
 421                         break;
 422                 case 0x10:
 423                         log_debug("profile 0x%02x dvd_rom", profile);
 424                         cd_dvd_rom = 1;
 425                         break;
 426                 case 0x12:
 427                         log_debug("profile 0x%02x dvd_ram", profile);
 428                         cd_dvd_ram = 1;
 429                         break;
 430                 case 0x13:
 431                 case 0x14:
 432                         log_debug("profile 0x%02x dvd_rw", profile);
 433                         cd_dvd_rw = 1;
 434                         break;
 435                 case 0x1B:
 436                         log_debug("profile 0x%02x dvd_plus_r", profile);
 437                         cd_dvd_plus_r = 1;
 438                         break;
 439                 case 0x1A:
 440                         log_debug("profile 0x%02x dvd_plus_rw", profile);
 441                         cd_dvd_plus_rw = 1;
 442                         break;
 443                 case 0x2A:
 444                         log_debug("profile 0x%02x dvd_plus_rw_dl", profile);
 445                         cd_dvd_plus_rw_dl = 1;
 446                         break;
 447                 case 0x2B:
 448                         log_debug("profile 0x%02x dvd_plus_r_dl", profile);
 449                         cd_dvd_plus_r_dl = 1;
 450                         break;
 451                 case 0x40:
 452                         cd_bd = 1;
 453                         log_debug("profile 0x%02x bd", profile);
 454                         break;
 455                 case 0x41:
 456                 case 0x42:
 457                         cd_bd_r = 1;
 458                         log_debug("profile 0x%02x bd_r", profile);
 459                         break;
 460                 case 0x43:
 461                         cd_bd_re = 1;
 462                         log_debug("profile 0x%02x bd_re", profile);
 463                         break;
 464                 case 0x50:
 465                         cd_hddvd = 1;
 466                         log_debug("profile 0x%02x hddvd", profile);
 467                         break;
 468                 case 0x51:
 469                         cd_hddvd_r = 1;
 470                         log_debug("profile 0x%02x hddvd_r", profile);
 471                         break;
 472                 case 0x52:
 473                         cd_hddvd_rw = 1;
 474                         log_debug("profile 0x%02x hddvd_rw", profile);
 475                         break;
 476                 default:
 477                         log_debug("profile 0x%02x <ignored>", profile);
 478                         break;
 479                 }
 480         }
 481         return 0;
 482 }
 483
 484 /* returns 0 if media was detected */
 485 static int cd_profiles_old_mmc(struct udev *udev, int fd)
 486 {
 487         struct scsi_cmd sc;
 488         int err;
 489
 490         unsigned char header[32];
 491
 492         scsi_cmd_init(udev, &sc);
 493         scsi_cmd_set(udev, &sc, 0, 0x51);
 494         scsi_cmd_set(udev, &sc, 8, sizeof(header));
 495         scsi_cmd_set(udev, &sc, 9, 0);
 496         err = scsi_cmd_run(udev, &sc, fd, header, sizeof(header));
 497         if ((err != 0)) {
 498                 info_scsi_cmd_err(udev, "READ DISC INFORMATION", err);
 499                 if (cd_media == 1) {
 500                         log_debug("no current profile, but disc is present; assuming CD-ROM");
 501                         cd_media_cd_rom = 1;
 502                         cd_media_track_count = 1;
 503                         cd_media_track_count_data = 1;
 504                         return 0;
 505                 } else {
 506                         log_debug("no current profile, assuming no media");
 507                         return -1;
 508                 }
 509         };
 510
 511         cd_media = 1;
 512
 513         if (header[2] & 16) {
 514                 cd_media_cd_rw = 1;
 515                 log_debug("profile 0x0a media_cd_rw");
 516         } else if ((header[2] & 3) < 2 && cd_cd_r) {
 517                 cd_media_cd_r = 1;
 518                 log_debug("profile 0x09 media_cd_r");
 519         } else {
 520                 cd_media_cd_rom = 1;
 521                 log_debug("profile 0x08 media_cd_rom");
 522         }
 523         return 0;
 524 }
 525
 526 /* returns 0 if media was detected */
 527 static int cd_profiles(struct udev *udev, int fd)
 528 {
 529         struct scsi_cmd sc;
 530         unsigned char features[65530];
 531         unsigned int cur_profile = 0;
 532         unsigned int len;
 533         unsigned int i;
 534         int err;
 535         int ret;
 536
 537         ret = -1;
 538
 539         /* First query the current profile */
 540         scsi_cmd_init(udev, &sc);
 541         scsi_cmd_set(udev, &sc, 0, 0x46);
 542         scsi_cmd_set(udev, &sc, 8, 8);
 543         scsi_cmd_set(udev, &sc, 9, 0);
 544         err = scsi_cmd_run(udev, &sc, fd, features, 8);
 545         if ((err != 0)) {
 546                 info_scsi_cmd_err(udev, "GET CONFIGURATION", err);
 547                 /* handle pre-MMC2 drives which do not support GET CONFIGURATION */
 548                 if (SK(err) == 0x5 && IN_SET(ASC(err), 0x20, 0x24)) {
 549                         log_debug("drive is pre-MMC2 and does not support 46h get configuration command");
 550                         log_debug("trying to work around the problem");
 551                         ret = cd_profiles_old_mmc(udev, fd);
 552                 }
 553                 goto out;
 554         }
 555
 556         cur_profile = features[6] << 8 | features[7];
 557         if (cur_profile > 0) {
 558                 log_debug("current profile 0x%02x", cur_profile);
 559                 feature_profile_media (udev, cur_profile);
 560                 ret = 0; /* we have media */
 561         } else {
 562                 log_debug("no current profile, assuming no media");
 563         }
 564
 565         len = features[0] << 24 | features[1] << 16 | features[2] << 8 | features[3];
 566         log_debug("GET CONFIGURATION: size of features buffer 0x%04x", len);
 567
 568         if (len > sizeof(features)) {
 569                 log_debug("cannot get features in a single query, truncating");
 570                 len = sizeof(features);
 571         } else if (len <= 8)
 572                 len = sizeof(features);
 573
 574         /* Now get the full feature buffer */
 575         scsi_cmd_init(udev, &sc);
 576         scsi_cmd_set(udev, &sc, 0, 0x46);
 577         scsi_cmd_set(udev, &sc, 7, ( len >> 8 ) & 0xff);
 578         scsi_cmd_set(udev, &sc, 8, len & 0xff);
 579         scsi_cmd_set(udev, &sc, 9, 0);
 580         err = scsi_cmd_run(udev, &sc, fd, features, len);
 581         if ((err != 0)) {
 582                 info_scsi_cmd_err(udev, "GET CONFIGURATION", err);
 583                 return -1;
 584         }
 585
 586         /* parse the length once more, in case the drive decided to have other features suddenly :) */
 587         len = features[0] << 24 | features[1] << 16 | features[2] << 8 | features[3];
 588         log_debug("GET CONFIGURATION: size of features buffer 0x%04x", len);
 589
 590         if (len > sizeof(features)) {
 591                 log_debug("cannot get features in a single query, truncating");
 592                 len = sizeof(features);
 593         }
 594
 595         /* device features */
 596         for (i = 8; i+4 < len; i += (4 + features[i+3])) {
 597                 unsigned int feature;
 598
 599                 feature = features[i] << 8 | features[i+1];
 600
 601                 switch (feature) {
 602                 case 0x00:
 603                         log_debug("GET CONFIGURATION: feature 'profiles', with %i entries", features[i+3] / 4);
 604                         feature_profiles(udev, &features[i]+4, MIN(features[i+3], len - i - 4));
 605                         break;
 606                 default:
 607                         log_debug("GET CONFIGURATION: feature 0x%04x <ignored>, with 0x%02x bytes", feature, features[i+3]);
 608                         break;
 609                 }
 610         }
 611 out:
 612         return ret;
 613 }
 614
 615 static int cd_media_info(struct udev *udev, int fd)
 616 {
 617         struct scsi_cmd sc;
 618         unsigned char header[32];
 619         static const char *media_status[] = {
 620                 "blank",
 621                 "appendable",
 622                 "complete",
 623                 "other"
 624         };
 625         int err;
 626
 627         scsi_cmd_init(udev, &sc);
 628         scsi_cmd_set(udev, &sc, 0, 0x51);
 629         scsi_cmd_set(udev, &sc, 8, sizeof(header) & 0xff);
 630         scsi_cmd_set(udev, &sc, 9, 0);
 631         err = scsi_cmd_run(udev, &sc, fd, header, sizeof(header));
 632         if ((err != 0)) {
 633                 info_scsi_cmd_err(udev, "READ DISC INFORMATION", err);
 634                 return -1;
 635         };
 636
 637         cd_media = 1;
 638         log_debug("disk type %02x", header[8]);
 639         log_debug("hardware reported media status: %s", media_status[header[2] & 3]);
 640
 641         /* exclude plain CDROM, some fake cdroms return 0 for "blank" media here */
 642         if (!cd_media_cd_rom)
 643                 cd_media_state = media_status[header[2] & 3];
 644
 645         /* fresh DVD-RW in restricted overwite mode reports itself as
 646          * "appendable"; change it to "blank" to make it consistent with what
 647          * gets reported after blanking, and what userspace expects  */
 648         if (cd_media_dvd_rw_ro && (header[2] & 3) == 1)
 649                 cd_media_state = media_status[0];
 650
 651         /* DVD+RW discs (and DVD-RW in restricted mode) once formatted are
 652          * always "complete", DVD-RAM are "other" or "complete" if the disc is
 653          * write protected; we need to check the contents if it is blank */
 654         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) {
 655                 unsigned char buffer[32 * 2048];
 656                 unsigned char len;
 657                 int offset;
 658
 659                 if (cd_media_dvd_ram) {
 660                         /* a write protected dvd-ram may report "complete" status */
 661
 662                         unsigned char dvdstruct[8];
 663                         unsigned char format[12];
 664
 665                         scsi_cmd_init(udev, &sc);
 666                         scsi_cmd_set(udev, &sc, 0, 0xAD);
 667                         scsi_cmd_set(udev, &sc, 7, 0xC0);
 668                         scsi_cmd_set(udev, &sc, 9, sizeof(dvdstruct));
 669                         scsi_cmd_set(udev, &sc, 11, 0);
 670                         err = scsi_cmd_run(udev, &sc, fd, dvdstruct, sizeof(dvdstruct));
 671                         if ((err != 0)) {
 672                                 info_scsi_cmd_err(udev, "READ DVD STRUCTURE", err);
 673                                 return -1;
 674                         }
 675                         if (dvdstruct[4] & 0x02) {
 676                                 cd_media_state = media_status[2];
 677                                 log_debug("write-protected DVD-RAM media inserted");
 678                                 goto determined;
 679                         }
 680
 681                         /* let's make sure we don't try to read unformatted media */
 682                         scsi_cmd_init(udev, &sc);
 683                         scsi_cmd_set(udev, &sc, 0, 0x23);
 684                         scsi_cmd_set(udev, &sc, 8, sizeof(format));
 685                         scsi_cmd_set(udev, &sc, 9, 0);
 686                         err = scsi_cmd_run(udev, &sc, fd, format, sizeof(format));
 687                         if ((err != 0)) {
 688                                 info_scsi_cmd_err(udev, "READ DVD FORMAT CAPACITIES", err);
 689                                 return -1;
 690                         }
 691
 692                         len = format[3];
 693                         if (len & 7 || len < 16) {
 694                                 log_debug("invalid format capacities length");
 695                                 return -1;
 696                         }
 697
 698                         switch(format[8] & 3) {
 699                             case 1:
 700                                 log_debug("unformatted DVD-RAM media inserted");
 701                                 /* This means that last format was interrupted
 702                                  * or failed, blank dvd-ram discs are factory
 703                                  * formatted. Take no action here as it takes
 704                                  * quite a while to reformat a dvd-ram and it's
 705                                  * not automatically started */
 706                                 goto determined;
 707
 708                             case 2:
 709                                 log_debug("formatted DVD-RAM media inserted");
 710                                 break;
 711
 712                             case 3:
 713                                 cd_media = 0; //return no media
 714                                 log_debug("format capacities returned no media");
 715                                 return -1;
 716                         }
 717                 }
 718
 719                 /* Take a closer look at formatted media (unformatted DVD+RW
 720                  * has "blank" status", DVD-RAM was examined earlier) and check
 721                  * for ISO and UDF PVDs or a fs superblock presence and do it
 722                  * in one ioctl (we need just sectors 0 and 16) */
 723                 scsi_cmd_init(udev, &sc);
 724                 scsi_cmd_set(udev, &sc, 0, 0x28);
 725                 scsi_cmd_set(udev, &sc, 5, 0);
 726                 scsi_cmd_set(udev, &sc, 8, 32);
 727                 scsi_cmd_set(udev, &sc, 9, 0);
 728                 err = scsi_cmd_run(udev, &sc, fd, buffer, sizeof(buffer));
 729                 if ((err != 0)) {
 730                         cd_media = 0;
 731                         info_scsi_cmd_err(udev, "READ FIRST 32 BLOCKS", err);
 732                         return -1;
 733                 }
 734
 735                 /* if any non-zero data is found in sector 16 (iso and udf) or
 736                  * eventually 0 (fat32 boot sector, ext2 superblock, etc), disc
 737                  * is assumed non-blank */
 738
 739                 for (offset = 32768; offset < (32768 + 2048); offset++) {
 740                         if (buffer [offset]) {
 741                                 log_debug("data in block 16, assuming complete");
 742                                 goto determined;
 743                         }
 744                 }
 745
 746                 for (offset = 0; offset < 2048; offset++) {
 747                         if (buffer [offset]) {
 748                                 log_debug("data in block 0, assuming complete");
 749                                 goto determined;
 750                         }
 751                 }
 752
 753                 cd_media_state = media_status[0];
 754                 log_debug("no data in blocks 0 or 16, assuming blank");
 755         }
 756
 757 determined:
 758         /* "other" is e. g. DVD-RAM, can't append sessions there; DVDs in
 759          * restricted overwrite mode can never append, only in sequential mode */
 760         if ((header[2] & 3) < 2 && !cd_media_dvd_rw_ro)
 761                 cd_media_session_next = header[10] << 8 | header[5];
 762         cd_media_session_count = header[9] << 8 | header[4];
 763         cd_media_track_count = header[11] << 8 | header[6];
 764
 765         return 0;
 766 }
 767
 768 static int cd_media_toc(struct udev *udev, int fd)
 769 {
 770         struct scsi_cmd sc;
 771         unsigned char header[12];
 772         unsigned char toc[65536];
 773         unsigned int len, i, num_tracks;
 774         unsigned char *p;
 775         int err;
 776
 777         scsi_cmd_init(udev, &sc);
 778         scsi_cmd_set(udev, &sc, 0, 0x43);
 779         scsi_cmd_set(udev, &sc, 6, 1);
 780         scsi_cmd_set(udev, &sc, 8, sizeof(header) & 0xff);
 781         scsi_cmd_set(udev, &sc, 9, 0);
 782         err = scsi_cmd_run(udev, &sc, fd, header, sizeof(header));
 783         if ((err != 0)) {
 784                 info_scsi_cmd_err(udev, "READ TOC", err);
 785                 return -1;
 786         }
 787
 788         len = (header[0] << 8 | header[1]) + 2;
 789         log_debug("READ TOC: len: %d, start track: %d, end track: %d", len, header[2], header[3]);
 790         if (len > sizeof(toc))
 791                 return -1;
 792         if (len < 2)
 793                 return -1;
 794         /* 2: first track, 3: last track */
 795         num_tracks = header[3] - header[2] + 1;
 796
 797         /* empty media has no tracks */
 798         if (len < 8)
 799                 return 0;
 800
 801         scsi_cmd_init(udev, &sc);
 802         scsi_cmd_set(udev, &sc, 0, 0x43);
 803         scsi_cmd_set(udev, &sc, 6, header[2]); /* First Track/Session Number */
 804         scsi_cmd_set(udev, &sc, 7, (len >> 8) & 0xff);
 805         scsi_cmd_set(udev, &sc, 8, len & 0xff);
 806         scsi_cmd_set(udev, &sc, 9, 0);
 807         err = scsi_cmd_run(udev, &sc, fd, toc, len);
 808         if ((err != 0)) {
 809                 info_scsi_cmd_err(udev, "READ TOC (tracks)", err);
 810                 return -1;
 811         }
 812
 813         /* Take care to not iterate beyond the last valid track as specified in
 814          * the TOC, but also avoid going beyond the TOC length, just in case
 815          * the last track number is invalidly large */
 816         for (p = toc+4, i = 4; i < len-8 && num_tracks > 0; i += 8, p += 8, --num_tracks) {
 817                 unsigned int block;
 818                 unsigned int is_data_track;
 819
 820                 is_data_track = (p[1] & 0x04) != 0;
 821
 822                 block = p[4] << 24 | p[5] << 16 | p[6] << 8 | p[7];
 823                 log_debug("track=%u info=0x%x(%s) start_block=%u",
 824                      p[2], p[1] & 0x0f, is_data_track ? "data":"audio", block);
 825
 826                 if (is_data_track)
 827                         cd_media_track_count_data++;
 828                 else
 829                         cd_media_track_count_audio++;
 830         }
 831
 832         scsi_cmd_init(udev, &sc);
 833         scsi_cmd_set(udev, &sc, 0, 0x43);
 834         scsi_cmd_set(udev, &sc, 2, 1); /* Session Info */
 835         scsi_cmd_set(udev, &sc, 8, sizeof(header));
 836         scsi_cmd_set(udev, &sc, 9, 0);
 837         err = scsi_cmd_run(udev, &sc, fd, header, sizeof(header));
 838         if ((err != 0)) {
 839                 info_scsi_cmd_err(udev, "READ TOC (multi session)", err);
 840                 return -1;
 841         }
 842         len = header[4+4] << 24 | header[4+5] << 16 | header[4+6] << 8 | header[4+7];
 843         log_debug("last track %u starts at block %u", header[4+2], len);
 844         cd_media_session_last_offset = (unsigned long long int)len * 2048;
 845         return 0;
 846 }
 847
 848 int main(int argc, char *argv[]) {
 849         struct udev *udev;
 850         static const struct option options[] = {
 851                 { "lock-media", no_argument, NULL, 'l' },
 852                 { "unlock-media", no_argument, NULL, 'u' },
 853                 { "eject-media", no_argument, NULL, 'e' },
 854                 { "debug", no_argument, NULL, 'd' },
 855                 { "help", no_argument, NULL, 'h' },
 856                 {}
 857         };
 858         bool eject = false;
 859         bool lock = false;
 860         bool unlock = false;
 861         const char *node = NULL;
 862         int fd = -1;
 863         int cnt;
 864         int rc = 0;
 865
 866         log_set_target(LOG_TARGET_AUTO);
 867         udev_parse_config();
 868         log_parse_environment();
 869         log_open();
 870
 871         udev = udev_new();
 872         if (udev == NULL)
 873                 goto exit;
 874
 875         for (;;) {
 876                 int option;
 877
 878                 option = getopt_long(argc, argv, "deluh", options, NULL);
 879                 if (option == -1)
 880                         break;
 881
 882                 switch (option) {
 883                 case 'l':
 884                         lock = true;
 885                         break;
 886                 case 'u':
 887                         unlock = true;
 888                         break;
 889                 case 'e':
 890                         eject = true;
 891                         break;
 892                 case 'd':
 893                         log_set_target(LOG_TARGET_CONSOLE);
 894                         log_set_max_level(LOG_DEBUG);
 895                         log_open();
 896                         break;
 897                 case 'h':
 898                         printf("Usage: cdrom_id [options] <device>\n"
 899                                "  -l,--lock-media    lock the media (to enable eject request events)\n"
 900                                "  -u,--unlock-media  unlock the media\n"
 901                                "  -e,--eject-media   eject the media\n"
 902                                "  -d,--debug         debug to stderr\n"
 903                                "  -h,--help          print this help text\n\n");
 904                         goto exit;
 905                 default:
 906                         rc = 1;
 907                         goto exit;
 908                 }
 909         }
 910
 911         node = argv[optind];
 912         if (!node) {
 913                 log_error("no device");
 914                 fprintf(stderr, "no device\n");
 915                 rc = 1;
 916                 goto exit;
 917         }
 918
 919         initialize_srand();
 920         for (cnt = 20; cnt > 0; cnt--) {
 921                 struct timespec duration;
 922
 923                 fd = open(node, O_RDONLY|O_NONBLOCK|O_CLOEXEC|(is_mounted(node) ? 0 : O_EXCL));
 924                 if (fd >= 0 || errno != EBUSY)
 925                         break;
 926                 duration.tv_sec = 0;
 927                 duration.tv_nsec = (100 * 1000 * 1000) + (rand() % 100 * 1000 * 1000);
 928                 nanosleep(&duration, NULL);
 929         }
 930         if (fd < 0) {
 931                 log_debug("unable to open '%s'", node);
 932                 fprintf(stderr, "unable to open '%s'\n", node);
 933                 rc = 1;
 934                 goto exit;
 935         }
 936         log_debug("probing: '%s'", node);
 937
 938         /* same data as original cdrom_id */
 939         if (cd_capability_compat(udev, fd) < 0) {
 940                 rc = 1;
 941                 goto exit;
 942         }
 943
 944         /* check for media - don't bail if there's no media as we still need to
 945          * to read profiles */
 946         cd_media_compat(udev, fd);
 947
 948         /* check if drive talks MMC */
 949         if (cd_inquiry(udev, fd) < 0)
 950                 goto work;
 951
 952         /* read drive and possibly current profile */
 953         if (cd_profiles(udev, fd) != 0)
 954                 goto work;
 955
 956         /* at this point we are guaranteed to have media in the drive - find out more about it */
 957
 958         /* get session/track info */
 959         cd_media_toc(udev, fd);
 960
 961         /* get writable media state */
 962         cd_media_info(udev, fd);
 963
 964 work:
 965         /* lock the media, so we enable eject button events */
 966         if (lock && cd_media) {
 967                 log_debug("PREVENT_ALLOW_MEDIUM_REMOVAL (lock)");
 968                 media_lock(udev, fd, true);
 969         }
 970
 971         if (unlock && cd_media) {
 972                 log_debug("PREVENT_ALLOW_MEDIUM_REMOVAL (unlock)");
 973                 media_lock(udev, fd, false);
 974         }
 975
 976         if (eject) {
 977                 log_debug("PREVENT_ALLOW_MEDIUM_REMOVAL (unlock)");
 978                 media_lock(udev, fd, false);
 979                 log_debug("START_STOP_UNIT (eject)");
 980                 media_eject(udev, fd);
 981         }
 982
 983         printf("ID_CDROM=1\n");
 984         if (cd_cd_rom)
 985                 printf("ID_CDROM_CD=1\n");
 986         if (cd_cd_r)
 987                 printf("ID_CDROM_CD_R=1\n");
 988         if (cd_cd_rw)
 989                 printf("ID_CDROM_CD_RW=1\n");
 990         if (cd_dvd_rom)
 991                 printf("ID_CDROM_DVD=1\n");
 992         if (cd_dvd_r)
 993                 printf("ID_CDROM_DVD_R=1\n");
 994         if (cd_dvd_rw)
 995                 printf("ID_CDROM_DVD_RW=1\n");
 996         if (cd_dvd_ram)
 997                 printf("ID_CDROM_DVD_RAM=1\n");
 998         if (cd_dvd_plus_r)
 999                 printf("ID_CDROM_DVD_PLUS_R=1\n");
1000         if (cd_dvd_plus_rw)
1001                 printf("ID_CDROM_DVD_PLUS_RW=1\n");
1002         if (cd_dvd_plus_r_dl)
1003                 printf("ID_CDROM_DVD_PLUS_R_DL=1\n");
1004         if (cd_dvd_plus_rw_dl)
1005                 printf("ID_CDROM_DVD_PLUS_RW_DL=1\n");
1006         if (cd_bd)
1007                 printf("ID_CDROM_BD=1\n");
1008         if (cd_bd_r)
1009                 printf("ID_CDROM_BD_R=1\n");
1010         if (cd_bd_re)
1011                 printf("ID_CDROM_BD_RE=1\n");
1012         if (cd_hddvd)
1013                 printf("ID_CDROM_HDDVD=1\n");
1014         if (cd_hddvd_r)
1015                 printf("ID_CDROM_HDDVD_R=1\n");
1016         if (cd_hddvd_rw)
1017                 printf("ID_CDROM_HDDVD_RW=1\n");
1018         if (cd_mo)
1019                 printf("ID_CDROM_MO=1\n");
1020         if (cd_mrw)
1021                 printf("ID_CDROM_MRW=1\n");
1022         if (cd_mrw_w)
1023                 printf("ID_CDROM_MRW_W=1\n");
1024
1025         if (cd_media)
1026                 printf("ID_CDROM_MEDIA=1\n");
1027         if (cd_media_mo)
1028                 printf("ID_CDROM_MEDIA_MO=1\n");
1029         if (cd_media_mrw)
1030                 printf("ID_CDROM_MEDIA_MRW=1\n");
1031         if (cd_media_mrw_w)
1032                 printf("ID_CDROM_MEDIA_MRW_W=1\n");
1033         if (cd_media_cd_rom)
1034                 printf("ID_CDROM_MEDIA_CD=1\n");
1035         if (cd_media_cd_r)
1036                 printf("ID_CDROM_MEDIA_CD_R=1\n");
1037         if (cd_media_cd_rw)
1038                 printf("ID_CDROM_MEDIA_CD_RW=1\n");
1039         if (cd_media_dvd_rom)
1040                 printf("ID_CDROM_MEDIA_DVD=1\n");
1041         if (cd_media_dvd_r)
1042                 printf("ID_CDROM_MEDIA_DVD_R=1\n");
1043         if (cd_media_dvd_ram)
1044                 printf("ID_CDROM_MEDIA_DVD_RAM=1\n");
1045         if (cd_media_dvd_rw)
1046                 printf("ID_CDROM_MEDIA_DVD_RW=1\n");
1047         if (cd_media_dvd_plus_r)
1048                 printf("ID_CDROM_MEDIA_DVD_PLUS_R=1\n");
1049         if (cd_media_dvd_plus_rw)
1050                 printf("ID_CDROM_MEDIA_DVD_PLUS_RW=1\n");
1051         if (cd_media_dvd_plus_rw_dl)
1052                 printf("ID_CDROM_MEDIA_DVD_PLUS_RW_DL=1\n");
1053         if (cd_media_dvd_plus_r_dl)
1054                 printf("ID_CDROM_MEDIA_DVD_PLUS_R_DL=1\n");
1055         if (cd_media_bd)
1056                 printf("ID_CDROM_MEDIA_BD=1\n");
1057         if (cd_media_bd_r)
1058                 printf("ID_CDROM_MEDIA_BD_R=1\n");
1059         if (cd_media_bd_re)
1060                 printf("ID_CDROM_MEDIA_BD_RE=1\n");
1061         if (cd_media_hddvd)
1062                 printf("ID_CDROM_MEDIA_HDDVD=1\n");
1063         if (cd_media_hddvd_r)
1064                 printf("ID_CDROM_MEDIA_HDDVD_R=1\n");
1065         if (cd_media_hddvd_rw)
1066                 printf("ID_CDROM_MEDIA_HDDVD_RW=1\n");
1067
1068         if (cd_media_state != NULL)
1069                 printf("ID_CDROM_MEDIA_STATE=%s\n", cd_media_state);
1070         if (cd_media_session_next > 0)
1071                 printf("ID_CDROM_MEDIA_SESSION_NEXT=%u\n", cd_media_session_next);
1072         if (cd_media_session_count > 0)
1073                 printf("ID_CDROM_MEDIA_SESSION_COUNT=%u\n", cd_media_session_count);
1074         if (cd_media_session_count > 1 && cd_media_session_last_offset > 0)
1075                 printf("ID_CDROM_MEDIA_SESSION_LAST_OFFSET=%llu\n", cd_media_session_last_offset);
1076         if (cd_media_track_count > 0)
1077                 printf("ID_CDROM_MEDIA_TRACK_COUNT=%u\n", cd_media_track_count);
1078         if (cd_media_track_count_audio > 0)
1079                 printf("ID_CDROM_MEDIA_TRACK_COUNT_AUDIO=%u\n", cd_media_track_count_audio);
1080         if (cd_media_track_count_data > 0)
1081                 printf("ID_CDROM_MEDIA_TRACK_COUNT_DATA=%u\n", cd_media_track_count_data);
1082 exit:
1083         if (fd >= 0)
1084                 close(fd);
1085         udev_unref(udev);
1086         log_close();
1087         return rc;
1088 }