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c8a202b7d4
systemd/src/udev/cdrom_id/cdrom_id.c
Lennart Poettering c8a202b7d4 everywhere: always use O_CLOEXEC where it makes sense
2014-02-13 14:59:56 +01:00

1099 lines
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/*
* cdrom_id - optical drive and media information prober
*
* Copyright (C) 2008-2010 Kay Sievers <kay@vrfy.org>
*
* This program is free software: you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation, either version 2 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program. If not, see <http://www.gnu.org/licenses/>.
*/
#include <stdio.h>
#include <stddef.h>
#include <stdlib.h>
#include <unistd.h>
#include <string.h>
#include <limits.h>
#include <fcntl.h>
#include <errno.h>
#include <getopt.h>
#include <time.h>
#include <scsi/sg.h>
#include <sys/types.h>
#include <sys/stat.h>
#include <sys/time.h>
#include <sys/ioctl.h>
#include <linux/cdrom.h>
#include "libudev.h"
#include "libudev-private.h"
static bool debug;
_printf_(6,0)
static void log_fn(struct udev *udev, int priority,
const char *file, int line, const char *fn,
const char *format, va_list args)
{
if (debug) {
fprintf(stderr, "%s: ", fn);
vfprintf(stderr, format, args);
} else {
vsyslog(priority, format, args);
}
}
/* device info */
static unsigned int cd_cd_rom;
static unsigned int cd_cd_r;
static unsigned int cd_cd_rw;
static unsigned int cd_dvd_rom;
static unsigned int cd_dvd_r;
static unsigned int cd_dvd_rw;
static unsigned int cd_dvd_ram;
static unsigned int cd_dvd_plus_r;
static unsigned int cd_dvd_plus_rw;
static unsigned int cd_dvd_plus_r_dl;
static unsigned int cd_dvd_plus_rw_dl;
static unsigned int cd_bd;
static unsigned int cd_bd_r;
static unsigned int cd_bd_re;
static unsigned int cd_hddvd;
static unsigned int cd_hddvd_r;
static unsigned int cd_hddvd_rw;
static unsigned int cd_mo;
static unsigned int cd_mrw;
static unsigned int cd_mrw_w;
/* media info */
static unsigned int cd_media;
static unsigned int cd_media_cd_rom;
static unsigned int cd_media_cd_r;
static unsigned int cd_media_cd_rw;
static unsigned int cd_media_dvd_rom;
static unsigned int cd_media_dvd_r;
static unsigned int cd_media_dvd_rw;
static unsigned int cd_media_dvd_rw_ro; /* restricted overwrite mode */
static unsigned int cd_media_dvd_rw_seq; /* sequential mode */
static unsigned int cd_media_dvd_ram;
static unsigned int cd_media_dvd_plus_r;
static unsigned int cd_media_dvd_plus_rw;
static unsigned int cd_media_dvd_plus_r_dl;
static unsigned int cd_media_dvd_plus_rw_dl;
static unsigned int cd_media_bd;
static unsigned int cd_media_bd_r;
static unsigned int cd_media_bd_re;
static unsigned int cd_media_hddvd;
static unsigned int cd_media_hddvd_r;
static unsigned int cd_media_hddvd_rw;
static unsigned int cd_media_mo;
static unsigned int cd_media_mrw;
static unsigned int cd_media_mrw_w;
static const char *cd_media_state = NULL;
static unsigned int cd_media_session_next;
static unsigned int cd_media_session_count;
static unsigned int cd_media_track_count;
static unsigned int cd_media_track_count_data;
static unsigned int cd_media_track_count_audio;
static unsigned long long int cd_media_session_last_offset;
#define ERRCODE(s) ((((s)[2] & 0x0F) << 16) | ((s)[12] << 8) | ((s)[13]))
#define SK(errcode) (((errcode) >> 16) & 0xF)
#define ASC(errcode) (((errcode) >> 8) & 0xFF)
#define ASCQ(errcode) ((errcode) & 0xFF)
static bool is_mounted(const char *device)
{
struct stat statbuf;
FILE *fp;
int maj, min;
bool mounted = false;
if (stat(device, &statbuf) < 0)
return -ENODEV;
fp = fopen("/proc/self/mountinfo", "re");
if (fp == NULL)
return -ENOSYS;
while (fscanf(fp, "%*s %*s %i:%i %*[^\n]", &maj, &min) == 2) {
if (makedev(maj, min) == statbuf.st_rdev) {
mounted = true;
break;
}
}
fclose(fp);
return mounted;
}
static void info_scsi_cmd_err(struct udev *udev, const char *cmd, int err)
{
if (err == -1) {
log_debug("%s failed", cmd);
return;
}
log_debug("%s failed with SK=%Xh/ASC=%02Xh/ACQ=%02Xh", cmd, SK(err), ASC(err), ASCQ(err));
}
struct scsi_cmd {
struct cdrom_generic_command cgc;
union {
struct request_sense s;
unsigned char u[18];
} _sense;
struct sg_io_hdr sg_io;
};
static void scsi_cmd_init(struct udev *udev, struct scsi_cmd *cmd)
{
memzero(cmd, sizeof(struct scsi_cmd));
cmd->cgc.quiet = 1;
cmd->cgc.sense = &cmd->_sense.s;
cmd->sg_io.interface_id = 'S';
cmd->sg_io.mx_sb_len = sizeof(cmd->_sense);
cmd->sg_io.cmdp = cmd->cgc.cmd;
cmd->sg_io.sbp = cmd->_sense.u;
cmd->sg_io.flags = SG_FLAG_LUN_INHIBIT | SG_FLAG_DIRECT_IO;
}
static void scsi_cmd_set(struct udev *udev, struct scsi_cmd *cmd, size_t i, unsigned char arg)
{
cmd->sg_io.cmd_len = i + 1;
cmd->cgc.cmd[i] = arg;
}
#define CHECK_CONDITION 0x01
static int scsi_cmd_run(struct udev *udev, struct scsi_cmd *cmd, int fd, unsigned char *buf, size_t bufsize)
{
int ret = 0;
if (bufsize > 0) {
cmd->sg_io.dxferp = buf;
cmd->sg_io.dxfer_len = bufsize;
cmd->sg_io.dxfer_direction = SG_DXFER_FROM_DEV;
} else {
cmd->sg_io.dxfer_direction = SG_DXFER_NONE;
}
if (ioctl(fd, SG_IO, &cmd->sg_io))
return -1;
if ((cmd->sg_io.info & SG_INFO_OK_MASK) != SG_INFO_OK) {
errno = EIO;
ret = -1;
if (cmd->sg_io.masked_status & CHECK_CONDITION) {
ret = ERRCODE(cmd->_sense.u);
if (ret == 0)
ret = -1;
}
}
return ret;
}
static int media_lock(struct udev *udev, int fd, bool lock)
{
int err;
/* disable the kernel's lock logic */
err = ioctl(fd, CDROM_CLEAR_OPTIONS, CDO_LOCK);
if (err < 0)
log_debug("CDROM_CLEAR_OPTIONS, CDO_LOCK failed");
err = ioctl(fd, CDROM_LOCKDOOR, lock ? 1 : 0);
if (err < 0)
log_debug("CDROM_LOCKDOOR failed");
return err;
}
static int media_eject(struct udev *udev, int fd)
{
struct scsi_cmd sc;
int err;
scsi_cmd_init(udev, &sc);
scsi_cmd_set(udev, &sc, 0, 0x1b);
scsi_cmd_set(udev, &sc, 4, 0x02);
scsi_cmd_set(udev, &sc, 5, 0);
err = scsi_cmd_run(udev, &sc, fd, NULL, 0);
if ((err != 0)) {
info_scsi_cmd_err(udev, "START_STOP_UNIT", err);
return -1;
}
return 0;
}
static int cd_capability_compat(struct udev *udev, int fd)
{
int capability;
capability = ioctl(fd, CDROM_GET_CAPABILITY, NULL);
if (capability < 0) {
log_debug("CDROM_GET_CAPABILITY failed");
return -1;
}
if (capability & CDC_CD_R)
cd_cd_r = 1;
if (capability & CDC_CD_RW)
cd_cd_rw = 1;
if (capability & CDC_DVD)
cd_dvd_rom = 1;
if (capability & CDC_DVD_R)
cd_dvd_r = 1;
if (capability & CDC_DVD_RAM)
cd_dvd_ram = 1;
if (capability & CDC_MRW)
cd_mrw = 1;
if (capability & CDC_MRW_W)
cd_mrw_w = 1;
return 0;
}
static int cd_media_compat(struct udev *udev, int fd)
{
if (ioctl(fd, CDROM_DRIVE_STATUS, CDSL_CURRENT) != CDS_DISC_OK) {
log_debug("CDROM_DRIVE_STATUS != CDS_DISC_OK");
return -1;
}
cd_media = 1;
return 0;
}
static int cd_inquiry(struct udev *udev, int fd)
{
struct scsi_cmd sc;
unsigned char inq[128];
int err;
scsi_cmd_init(udev, &sc);
scsi_cmd_set(udev, &sc, 0, 0x12);
scsi_cmd_set(udev, &sc, 4, 36);
scsi_cmd_set(udev, &sc, 5, 0);
err = scsi_cmd_run(udev, &sc, fd, inq, 36);
if ((err != 0)) {
info_scsi_cmd_err(udev, "INQUIRY", err);
return -1;
}
if ((inq[0] & 0x1F) != 5) {
log_debug("not an MMC unit");
return -1;
}
log_debug("INQUIRY: [%.8s][%.16s][%.4s]", inq + 8, inq + 16, inq + 32);
return 0;
}
static void feature_profile_media(struct udev *udev, int cur_profile)
{
switch (cur_profile) {
case 0x03:
case 0x04:
case 0x05:
log_debug("profile 0x%02x ", cur_profile);
cd_media = 1;
cd_media_mo = 1;
break;
case 0x08:
log_debug("profile 0x%02x media_cd_rom", cur_profile);
cd_media = 1;
cd_media_cd_rom = 1;
break;
case 0x09:
log_debug("profile 0x%02x media_cd_r", cur_profile);
cd_media = 1;
cd_media_cd_r = 1;
break;
case 0x0a:
log_debug("profile 0x%02x media_cd_rw", cur_profile);
cd_media = 1;
cd_media_cd_rw = 1;
break;
case 0x10:
log_debug("profile 0x%02x media_dvd_ro", cur_profile);
cd_media = 1;
cd_media_dvd_rom = 1;
break;
case 0x11:
log_debug("profile 0x%02x media_dvd_r", cur_profile);
cd_media = 1;
cd_media_dvd_r = 1;
break;
case 0x12:
log_debug("profile 0x%02x media_dvd_ram", cur_profile);
cd_media = 1;
cd_media_dvd_ram = 1;
break;
case 0x13:
log_debug("profile 0x%02x media_dvd_rw_ro", cur_profile);
cd_media = 1;
cd_media_dvd_rw = 1;
cd_media_dvd_rw_ro = 1;
break;
case 0x14:
log_debug("profile 0x%02x media_dvd_rw_seq", cur_profile);
cd_media = 1;
cd_media_dvd_rw = 1;
cd_media_dvd_rw_seq = 1;
break;
case 0x1B:
log_debug("profile 0x%02x media_dvd_plus_r", cur_profile);
cd_media = 1;
cd_media_dvd_plus_r = 1;
break;
case 0x1A:
log_debug("profile 0x%02x media_dvd_plus_rw", cur_profile);
cd_media = 1;
cd_media_dvd_plus_rw = 1;
break;
case 0x2A:
log_debug("profile 0x%02x media_dvd_plus_rw_dl", cur_profile);
cd_media = 1;
cd_media_dvd_plus_rw_dl = 1;
break;
case 0x2B:
log_debug("profile 0x%02x media_dvd_plus_r_dl", cur_profile);
cd_media = 1;
cd_media_dvd_plus_r_dl = 1;
break;
case 0x40:
log_debug("profile 0x%02x media_bd", cur_profile);
cd_media = 1;
cd_media_bd = 1;
break;
case 0x41:
case 0x42:
log_debug("profile 0x%02x media_bd_r", cur_profile);
cd_media = 1;
cd_media_bd_r = 1;
break;
case 0x43:
log_debug("profile 0x%02x media_bd_re", cur_profile);
cd_media = 1;
cd_media_bd_re = 1;
break;
case 0x50:
log_debug("profile 0x%02x media_hddvd", cur_profile);
cd_media = 1;
cd_media_hddvd = 1;
break;
case 0x51:
log_debug("profile 0x%02x media_hddvd_r", cur_profile);
cd_media = 1;
cd_media_hddvd_r = 1;
break;
case 0x52:
log_debug("profile 0x%02x media_hddvd_rw", cur_profile);
cd_media = 1;
cd_media_hddvd_rw = 1;
break;
default:
log_debug("profile 0x%02x <ignored>", cur_profile);
break;
}
}
static int feature_profiles(struct udev *udev, const unsigned char *profiles, size_t size)
{
unsigned int i;
for (i = 0; i+4 <= size; i += 4) {
int profile;
profile = profiles[i] << 8 | profiles[i+1];
switch (profile) {
case 0x03:
case 0x04:
case 0x05:
log_debug("profile 0x%02x mo", profile);
cd_mo = 1;
break;
case 0x08:
log_debug("profile 0x%02x cd_rom", profile);
cd_cd_rom = 1;
break;
case 0x09:
log_debug("profile 0x%02x cd_r", profile);
cd_cd_r = 1;
break;
case 0x0A:
log_debug("profile 0x%02x cd_rw", profile);
cd_cd_rw = 1;
break;
case 0x10:
log_debug("profile 0x%02x dvd_rom", profile);
cd_dvd_rom = 1;
break;
case 0x12:
log_debug("profile 0x%02x dvd_ram", profile);
cd_dvd_ram = 1;
break;
case 0x13:
case 0x14:
log_debug("profile 0x%02x dvd_rw", profile);
cd_dvd_rw = 1;
break;
case 0x1B:
log_debug("profile 0x%02x dvd_plus_r", profile);
cd_dvd_plus_r = 1;
break;
case 0x1A:
log_debug("profile 0x%02x dvd_plus_rw", profile);
cd_dvd_plus_rw = 1;
break;
case 0x2A:
log_debug("profile 0x%02x dvd_plus_rw_dl", profile);
cd_dvd_plus_rw_dl = 1;
break;
case 0x2B:
log_debug("profile 0x%02x dvd_plus_r_dl", profile);
cd_dvd_plus_r_dl = 1;
break;
case 0x40:
cd_bd = 1;
log_debug("profile 0x%02x bd", profile);
break;
case 0x41:
case 0x42:
cd_bd_r = 1;
log_debug("profile 0x%02x bd_r", profile);
break;
case 0x43:
cd_bd_re = 1;
log_debug("profile 0x%02x bd_re", profile);
break;
case 0x50:
cd_hddvd = 1;
log_debug("profile 0x%02x hddvd", profile);
break;
case 0x51:
cd_hddvd_r = 1;
log_debug("profile 0x%02x hddvd_r", profile);
break;
case 0x52:
cd_hddvd_rw = 1;
log_debug("profile 0x%02x hddvd_rw", profile);
break;
default:
log_debug("profile 0x%02x <ignored>", profile);
break;
}
}
return 0;
}
/* returns 0 if media was detected */
static int cd_profiles_old_mmc(struct udev *udev, int fd)
{
struct scsi_cmd sc;
int err;
unsigned char header[32];
scsi_cmd_init(udev, &sc);
scsi_cmd_set(udev, &sc, 0, 0x51);
scsi_cmd_set(udev, &sc, 8, sizeof(header));
scsi_cmd_set(udev, &sc, 9, 0);
err = scsi_cmd_run(udev, &sc, fd, header, sizeof(header));
if ((err != 0)) {
info_scsi_cmd_err(udev, "READ DISC INFORMATION", err);
if (cd_media == 1) {
log_debug("no current profile, but disc is present; assuming CD-ROM");
cd_media_cd_rom = 1;
cd_media_track_count = 1;
cd_media_track_count_data = 1;
return 0;
} else {
log_debug("no current profile, assuming no media");
return -1;
}
};
cd_media = 1;
if (header[2] & 16) {
cd_media_cd_rw = 1;
log_debug("profile 0x0a media_cd_rw");
} else if ((header[2] & 3) < 2 && cd_cd_r) {
cd_media_cd_r = 1;
log_debug("profile 0x09 media_cd_r");
} else {
cd_media_cd_rom = 1;
log_debug("profile 0x08 media_cd_rom");
}
return 0;
}
/* returns 0 if media was detected */
static int cd_profiles(struct udev *udev, int fd)
{
struct scsi_cmd sc;
unsigned char features[65530];
unsigned int cur_profile = 0;
unsigned int len;
unsigned int i;
int err;
int ret;
ret = -1;
/* First query the current profile */
scsi_cmd_init(udev, &sc);
scsi_cmd_set(udev, &sc, 0, 0x46);
scsi_cmd_set(udev, &sc, 8, 8);
scsi_cmd_set(udev, &sc, 9, 0);
err = scsi_cmd_run(udev, &sc, fd, features, 8);
if ((err != 0)) {
info_scsi_cmd_err(udev, "GET CONFIGURATION", err);
/* handle pre-MMC2 drives which do not support GET CONFIGURATION */
if (SK(err) == 0x5 && ASC(err) == 0x20) {
log_debug("drive is pre-MMC2 and does not support 46h get configuration command");
log_debug("trying to work around the problem");
ret = cd_profiles_old_mmc(udev, fd);
}
goto out;
}
cur_profile = features[6] << 8 | features[7];
if (cur_profile > 0) {
log_debug("current profile 0x%02x", cur_profile);
feature_profile_media (udev, cur_profile);
ret = 0; /* we have media */
} else {
log_debug("no current profile, assuming no media");
}
len = features[0] << 24 | features[1] << 16 | features[2] << 8 | features[3];
log_debug("GET CONFIGURATION: size of features buffer 0x%04x", len);
if (len > sizeof(features)) {
log_debug("can not get features in a single query, truncating");
len = sizeof(features);
} else if (len <= 8) {
len = sizeof(features);
}
/* Now get the full feature buffer */
scsi_cmd_init(udev, &sc);
scsi_cmd_set(udev, &sc, 0, 0x46);
scsi_cmd_set(udev, &sc, 7, ( len >> 8 ) & 0xff);
scsi_cmd_set(udev, &sc, 8, len & 0xff);
scsi_cmd_set(udev, &sc, 9, 0);
err = scsi_cmd_run(udev, &sc, fd, features, len);
if ((err != 0)) {
info_scsi_cmd_err(udev, "GET CONFIGURATION", err);
return -1;
}
/* parse the length once more, in case the drive decided to have other features suddenly :) */
len = features[0] << 24 | features[1] << 16 | features[2] << 8 | features[3];
log_debug("GET CONFIGURATION: size of features buffer 0x%04x", len);
if (len > sizeof(features)) {
log_debug("can not get features in a single query, truncating");
len = sizeof(features);
}
/* device features */
for (i = 8; i+4 < len; i += (4 + features[i+3])) {
unsigned int feature;
feature = features[i] << 8 | features[i+1];
switch (feature) {
case 0x00:
log_debug("GET CONFIGURATION: feature 'profiles', with %i entries", features[i+3] / 4);
feature_profiles(udev, &features[i]+4, features[i+3]);
break;
default:
log_debug("GET CONFIGURATION: feature 0x%04x <ignored>, with 0x%02x bytes", feature, features[i+3]);
break;
}
}
out:
return ret;
}
static int cd_media_info(struct udev *udev, int fd)
{
struct scsi_cmd sc;
unsigned char header[32];
static const char *media_status[] = {
"blank",
"appendable",
"complete",
"other"
};
int err;
scsi_cmd_init(udev, &sc);
scsi_cmd_set(udev, &sc, 0, 0x51);
scsi_cmd_set(udev, &sc, 8, sizeof(header) & 0xff);
scsi_cmd_set(udev, &sc, 9, 0);
err = scsi_cmd_run(udev, &sc, fd, header, sizeof(header));
if ((err != 0)) {
info_scsi_cmd_err(udev, "READ DISC INFORMATION", err);
return -1;
};
cd_media = 1;
log_debug("disk type %02x", header[8]);
log_debug("hardware reported media status: %s", media_status[header[2] & 3]);
/* exclude plain CDROM, some fake cdroms return 0 for "blank" media here */
if (!cd_media_cd_rom)
cd_media_state = media_status[header[2] & 3];
/* fresh DVD-RW in restricted overwite mode reports itself as
* "appendable"; change it to "blank" to make it consistent with what
* gets reported after blanking, and what userspace expects */
if (cd_media_dvd_rw_ro && (header[2] & 3) == 1)
cd_media_state = media_status[0];
/* DVD+RW discs (and DVD-RW in restricted mode) once formatted are
* always "complete", DVD-RAM are "other" or "complete" if the disc is
* write protected; we need to check the contents if it is blank */
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) {
unsigned char buffer[32 * 2048];
unsigned char result, len;
int block, offset;
if (cd_media_dvd_ram) {
/* a write protected dvd-ram may report "complete" status */
unsigned char dvdstruct[8];
unsigned char format[12];
scsi_cmd_init(udev, &sc);
scsi_cmd_set(udev, &sc, 0, 0xAD);
scsi_cmd_set(udev, &sc, 7, 0xC0);
scsi_cmd_set(udev, &sc, 9, sizeof(dvdstruct));
scsi_cmd_set(udev, &sc, 11, 0);
err = scsi_cmd_run(udev, &sc, fd, dvdstruct, sizeof(dvdstruct));
if ((err != 0)) {
info_scsi_cmd_err(udev, "READ DVD STRUCTURE", err);
return -1;
}
if (dvdstruct[4] & 0x02) {
cd_media_state = media_status[2];
log_debug("write-protected DVD-RAM media inserted");
goto determined;
}
/* let's make sure we don't try to read unformatted media */
scsi_cmd_init(udev, &sc);
scsi_cmd_set(udev, &sc, 0, 0x23);
scsi_cmd_set(udev, &sc, 8, sizeof(format));
scsi_cmd_set(udev, &sc, 9, 0);
err = scsi_cmd_run(udev, &sc, fd, format, sizeof(format));
if ((err != 0)) {
info_scsi_cmd_err(udev, "READ DVD FORMAT CAPACITIES", err);
return -1;
}
len = format[3];
if (len & 7 || len < 16) {
log_debug("invalid format capacities length");
return -1;
}
switch(format[8] & 3) {
case 1:
log_debug("unformatted DVD-RAM media inserted");
/* This means that last format was interrupted
* or failed, blank dvd-ram discs are factory
* formatted. Take no action here as it takes
* quite a while to reformat a dvd-ram and it's
* not automatically started */
goto determined;
case 2:
log_debug("formatted DVD-RAM media inserted");
break;
case 3:
cd_media = 0; //return no media
log_debug("format capacities returned no media");
return -1;
}
}
/* Take a closer look at formatted media (unformatted DVD+RW
* has "blank" status", DVD-RAM was examined earlier) and check
* for ISO and UDF PVDs or a fs superblock presence and do it
* in one ioctl (we need just sectors 0 and 16) */
scsi_cmd_init(udev, &sc);
scsi_cmd_set(udev, &sc, 0, 0x28);
scsi_cmd_set(udev, &sc, 5, 0);
scsi_cmd_set(udev, &sc, 8, 32);
scsi_cmd_set(udev, &sc, 9, 0);
err = scsi_cmd_run(udev, &sc, fd, buffer, sizeof(buffer));
if ((err != 0)) {
cd_media = 0;
info_scsi_cmd_err(udev, "READ FIRST 32 BLOCKS", err);
return -1;
}
/* if any non-zero data is found in sector 16 (iso and udf) or
* eventually 0 (fat32 boot sector, ext2 superblock, etc), disc
* is assumed non-blank */
result = 0;
for (block = 32768; block >= 0 && !result; block -= 32768) {
offset = block;
while (offset < (block + 2048) && !result) {
result = buffer [offset];
offset++;
}
}
if (!result) {
cd_media_state = media_status[0];
log_debug("no data in blocks 0 or 16, assuming blank");
} else {
log_debug("data in blocks 0 or 16, assuming complete");
}
}
determined:
/* "other" is e. g. DVD-RAM, can't append sessions there; DVDs in
* restricted overwrite mode can never append, only in sequential mode */
if ((header[2] & 3) < 2 && !cd_media_dvd_rw_ro)
cd_media_session_next = header[10] << 8 | header[5];
cd_media_session_count = header[9] << 8 | header[4];
cd_media_track_count = header[11] << 8 | header[6];
return 0;
}
static int cd_media_toc(struct udev *udev, int fd)
{
struct scsi_cmd sc;
unsigned char header[12];
unsigned char toc[65536];
unsigned int len, i, num_tracks;
unsigned char *p;
int err;
scsi_cmd_init(udev, &sc);
scsi_cmd_set(udev, &sc, 0, 0x43);
scsi_cmd_set(udev, &sc, 6, 1);
scsi_cmd_set(udev, &sc, 8, sizeof(header) & 0xff);
scsi_cmd_set(udev, &sc, 9, 0);
err = scsi_cmd_run(udev, &sc, fd, header, sizeof(header));
if ((err != 0)) {
info_scsi_cmd_err(udev, "READ TOC", err);
return -1;
}
len = (header[0] << 8 | header[1]) + 2;
log_debug("READ TOC: len: %d, start track: %d, end track: %d", len, header[2], header[3]);
if (len > sizeof(toc))
return -1;
if (len < 2)
return -1;
/* 2: first track, 3: last track */
num_tracks = header[3] - header[2] + 1;
/* empty media has no tracks */
if (len < 8)
return 0;
scsi_cmd_init(udev, &sc);
scsi_cmd_set(udev, &sc, 0, 0x43);
scsi_cmd_set(udev, &sc, 6, header[2]); /* First Track/Session Number */
scsi_cmd_set(udev, &sc, 7, (len >> 8) & 0xff);
scsi_cmd_set(udev, &sc, 8, len & 0xff);
scsi_cmd_set(udev, &sc, 9, 0);
err = scsi_cmd_run(udev, &sc, fd, toc, len);
if ((err != 0)) {
info_scsi_cmd_err(udev, "READ TOC (tracks)", err);
return -1;
}
/* Take care to not iterate beyond the last valid track as specified in
* the TOC, but also avoid going beyond the TOC length, just in case
* the last track number is invalidly large */
for (p = toc+4, i = 4; i < len-8 && num_tracks > 0; i += 8, p += 8, --num_tracks) {
unsigned int block;
unsigned int is_data_track;
is_data_track = (p[1] & 0x04) != 0;
block = p[4] << 24 | p[5] << 16 | p[6] << 8 | p[7];
log_debug("track=%u info=0x%x(%s) start_block=%u",
p[2], p[1] & 0x0f, is_data_track ? "data":"audio", block);
if (is_data_track)
cd_media_track_count_data++;
else
cd_media_track_count_audio++;
}
scsi_cmd_init(udev, &sc);
scsi_cmd_set(udev, &sc, 0, 0x43);
scsi_cmd_set(udev, &sc, 2, 1); /* Session Info */
scsi_cmd_set(udev, &sc, 8, sizeof(header));
scsi_cmd_set(udev, &sc, 9, 0);
err = scsi_cmd_run(udev, &sc, fd, header, sizeof(header));
if ((err != 0)) {
info_scsi_cmd_err(udev, "READ TOC (multi session)", err);
return -1;
}
len = header[4+4] << 24 | header[4+5] << 16 | header[4+6] << 8 | header[4+7];
log_debug("last track %u starts at block %u", header[4+2], len);
cd_media_session_last_offset = (unsigned long long int)len * 2048;
return 0;
}
int main(int argc, char *argv[])
{
struct udev *udev;
static const struct option options[] = {
{ "lock-media", no_argument, NULL, 'l' },
{ "unlock-media", no_argument, NULL, 'u' },
{ "eject-media", no_argument, NULL, 'e' },
{ "debug", no_argument, NULL, 'd' },
{ "help", no_argument, NULL, 'h' },
{}
};
bool eject = false;
bool lock = false;
bool unlock = false;
const char *node = NULL;
int fd = -1;
int cnt;
int rc = 0;
udev = udev_new();
if (udev == NULL)
goto exit;
log_open();
udev_set_log_fn(udev, log_fn);
while (1) {
int option;
option = getopt_long(argc, argv, "deluh", options, NULL);
if (option == -1)
break;
switch (option) {
case 'l':
lock = true;
break;
case 'u':
unlock = true;
break;
case 'e':
eject = true;
break;
case 'd':
debug = true;
log_set_max_level(LOG_DEBUG);
udev_set_log_priority(udev, LOG_DEBUG);
break;
case 'h':
printf("Usage: cdrom_id [options] <device>\n"
" --lock-media lock the media (to enable eject request events)\n"
" --unlock-media unlock the media\n"
" --eject-media eject the media\n"
" --debug debug to stderr\n"
" --help print this help text\n\n");
goto exit;
default:
rc = 1;
goto exit;
}
}
node = argv[optind];
if (!node) {
log_error("no device");
fprintf(stderr, "no device\n");
rc = 1;
goto exit;
}
srand((unsigned int)getpid());
for (cnt = 20; cnt > 0; cnt--) {
struct timespec duration;
fd = open(node, O_RDONLY|O_NONBLOCK|O_CLOEXEC|(is_mounted(node) ? 0 : O_EXCL));
if (fd >= 0 || errno != EBUSY)
break;
duration.tv_sec = 0;
duration.tv_nsec = (100 * 1000 * 1000) + (rand() % 100 * 1000 * 1000);
nanosleep(&duration, NULL);
}
if (fd < 0) {
log_debug("unable to open '%s'", node);
fprintf(stderr, "unable to open '%s'\n", node);
rc = 1;
goto exit;
}
log_debug("probing: '%s'", node);
/* same data as original cdrom_id */
if (cd_capability_compat(udev, fd) < 0) {
rc = 1;
goto exit;
}
/* check for media - don't bail if there's no media as we still need to
* to read profiles */
cd_media_compat(udev, fd);
/* check if drive talks MMC */
if (cd_inquiry(udev, fd) < 0)
goto work;
/* read drive and possibly current profile */
if (cd_profiles(udev, fd) != 0)
goto work;
/* at this point we are guaranteed to have media in the drive - find out more about it */
/* get session/track info */
cd_media_toc(udev, fd);
/* get writable media state */
cd_media_info(udev, fd);
work:
/* lock the media, so we enable eject button events */
if (lock && cd_media) {
log_debug("PREVENT_ALLOW_MEDIUM_REMOVAL (lock)");
media_lock(udev, fd, true);
}
if (unlock && cd_media) {
log_debug("PREVENT_ALLOW_MEDIUM_REMOVAL (unlock)");
media_lock(udev, fd, false);
}
if (eject) {
log_debug("PREVENT_ALLOW_MEDIUM_REMOVAL (unlock)");
media_lock(udev, fd, false);
log_debug("START_STOP_UNIT (eject)");
media_eject(udev, fd);
}
printf("ID_CDROM=1\n");
if (cd_cd_rom)
printf("ID_CDROM_CD=1\n");
if (cd_cd_r)
printf("ID_CDROM_CD_R=1\n");
if (cd_cd_rw)
printf("ID_CDROM_CD_RW=1\n");
if (cd_dvd_rom)
printf("ID_CDROM_DVD=1\n");
if (cd_dvd_r)
printf("ID_CDROM_DVD_R=1\n");
if (cd_dvd_rw)
printf("ID_CDROM_DVD_RW=1\n");
if (cd_dvd_ram)
printf("ID_CDROM_DVD_RAM=1\n");
if (cd_dvd_plus_r)
printf("ID_CDROM_DVD_PLUS_R=1\n");
if (cd_dvd_plus_rw)
printf("ID_CDROM_DVD_PLUS_RW=1\n");
if (cd_dvd_plus_r_dl)
printf("ID_CDROM_DVD_PLUS_R_DL=1\n");
if (cd_dvd_plus_rw_dl)
printf("ID_CDROM_DVD_PLUS_RW_DL=1\n");
if (cd_bd)
printf("ID_CDROM_BD=1\n");
if (cd_bd_r)
printf("ID_CDROM_BD_R=1\n");
if (cd_bd_re)
printf("ID_CDROM_BD_RE=1\n");
if (cd_hddvd)
printf("ID_CDROM_HDDVD=1\n");
if (cd_hddvd_r)
printf("ID_CDROM_HDDVD_R=1\n");
if (cd_hddvd_rw)
printf("ID_CDROM_HDDVD_RW=1\n");
if (cd_mo)
printf("ID_CDROM_MO=1\n");
if (cd_mrw)
printf("ID_CDROM_MRW=1\n");
if (cd_mrw_w)
printf("ID_CDROM_MRW_W=1\n");
if (cd_media)
printf("ID_CDROM_MEDIA=1\n");
if (cd_media_mo)
printf("ID_CDROM_MEDIA_MO=1\n");
if (cd_media_mrw)
printf("ID_CDROM_MEDIA_MRW=1\n");
if (cd_media_mrw_w)
printf("ID_CDROM_MEDIA_MRW_W=1\n");
if (cd_media_cd_rom)
printf("ID_CDROM_MEDIA_CD=1\n");
if (cd_media_cd_r)
printf("ID_CDROM_MEDIA_CD_R=1\n");
if (cd_media_cd_rw)
printf("ID_CDROM_MEDIA_CD_RW=1\n");
if (cd_media_dvd_rom)
printf("ID_CDROM_MEDIA_DVD=1\n");
if (cd_media_dvd_r)
printf("ID_CDROM_MEDIA_DVD_R=1\n");
if (cd_media_dvd_ram)
printf("ID_CDROM_MEDIA_DVD_RAM=1\n");
if (cd_media_dvd_rw)
printf("ID_CDROM_MEDIA_DVD_RW=1\n");
if (cd_media_dvd_plus_r)
printf("ID_CDROM_MEDIA_DVD_PLUS_R=1\n");
if (cd_media_dvd_plus_rw)
printf("ID_CDROM_MEDIA_DVD_PLUS_RW=1\n");
if (cd_media_dvd_plus_rw_dl)
printf("ID_CDROM_MEDIA_DVD_PLUS_RW_DL=1\n");
if (cd_media_dvd_plus_r_dl)
printf("ID_CDROM_MEDIA_DVD_PLUS_R_DL=1\n");
if (cd_media_bd)
printf("ID_CDROM_MEDIA_BD=1\n");
if (cd_media_bd_r)
printf("ID_CDROM_MEDIA_BD_R=1\n");
if (cd_media_bd_re)
printf("ID_CDROM_MEDIA_BD_RE=1\n");
if (cd_media_hddvd)
printf("ID_CDROM_MEDIA_HDDVD=1\n");
if (cd_media_hddvd_r)
printf("ID_CDROM_MEDIA_HDDVD_R=1\n");
if (cd_media_hddvd_rw)
printf("ID_CDROM_MEDIA_HDDVD_RW=1\n");
if (cd_media_state != NULL)
printf("ID_CDROM_MEDIA_STATE=%s\n", cd_media_state);
if (cd_media_session_next > 0)
printf("ID_CDROM_MEDIA_SESSION_NEXT=%d\n", cd_media_session_next);
if (cd_media_session_count > 0)
printf("ID_CDROM_MEDIA_SESSION_COUNT=%d\n", cd_media_session_count);
if (cd_media_session_count > 1 && cd_media_session_last_offset > 0)
printf("ID_CDROM_MEDIA_SESSION_LAST_OFFSET=%llu\n", cd_media_session_last_offset);
if (cd_media_track_count > 0)
printf("ID_CDROM_MEDIA_TRACK_COUNT=%d\n", cd_media_track_count);
if (cd_media_track_count_audio > 0)
printf("ID_CDROM_MEDIA_TRACK_COUNT_AUDIO=%d\n", cd_media_track_count_audio);
if (cd_media_track_count_data > 0)
printf("ID_CDROM_MEDIA_TRACK_COUNT_DATA=%d\n", cd_media_track_count_data);
exit:
if (fd >= 0)
close(fd);
udev_unref(udev);
log_close();
return rc;
}
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