merge udev/, libudev/, systemd/ files in src/; move extras/ to src/

1 files changed, 1099 insertions, 0 deletions

diff --git a/src/extras/cdrom_id/cdrom_id.c b/src/extras/cdrom_id/cdrom_id.c
new file mode 100644
index 0000000000..664a00d2c7
--- /dev/null
+++ b/src/extras/cdrom_id/cdrom_id.c
@@ -0,0 +1,1099 @@
+/*
+ * cdrom_id - optical drive and media information prober
+ *
+ * Copyright (C) 2008-2010 Kay Sievers <kay.sievers@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/>.
+ */
+
+#ifndef _GNU_SOURCE
+#define _GNU_SOURCE 1
+#endif
+
+#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;
+
+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 = 0;
+static unsigned int cd_cd_r = 0;
+static unsigned int cd_cd_rw = 0;
+static unsigned int cd_dvd_rom = 0;
+static unsigned int cd_dvd_r = 0;
+static unsigned int cd_dvd_rw = 0;
+static unsigned int cd_dvd_ram = 0;
+static unsigned int cd_dvd_plus_r = 0;
+static unsigned int cd_dvd_plus_rw = 0;
+static unsigned int cd_dvd_plus_r_dl = 0;
+static unsigned int cd_dvd_plus_rw_dl = 0;
+static unsigned int cd_bd = 0;
+static unsigned int cd_bd_r = 0;
+static unsigned int cd_bd_re = 0;
+static unsigned int cd_hddvd = 0;
+static unsigned int cd_hddvd_r = 0;
+static unsigned int cd_hddvd_rw = 0;
+static unsigned int cd_mo = 0;
+static unsigned int cd_mrw = 0;
+static unsigned int cd_mrw_w = 0;
+
+/* media info */
+static unsigned int cd_media = 0;
+static unsigned int cd_media_cd_rom = 0;
+static unsigned int cd_media_cd_r = 0;
+static unsigned int cd_media_cd_rw = 0;
+static unsigned int cd_media_dvd_rom = 0;
+static unsigned int cd_media_dvd_r = 0;
+static unsigned int cd_media_dvd_rw = 0;
+static unsigned int cd_media_dvd_rw_ro = 0; /* restricted overwrite mode */
+static unsigned int cd_media_dvd_rw_seq = 0; /* sequential mode */
+static unsigned int cd_media_dvd_ram = 0;
+static unsigned int cd_media_dvd_plus_r = 0;
+static unsigned int cd_media_dvd_plus_rw = 0;
+static unsigned int cd_media_dvd_plus_r_dl = 0;
+static unsigned int cd_media_dvd_plus_rw_dl = 0;
+static unsigned int cd_media_bd = 0;
+static unsigned int cd_media_bd_r = 0;
+static unsigned int cd_media_bd_re = 0;
+static unsigned int cd_media_hddvd = 0;
+static unsigned int cd_media_hddvd_r = 0;
+static unsigned int cd_media_hddvd_rw = 0;
+static unsigned int cd_media_mo = 0;
+static unsigned int cd_media_mrw = 0;
+static unsigned int cd_media_mrw_w = 0;
+
+static const char *cd_media_state = NULL;
+static unsigned int cd_media_session_next = 0;
+static unsigned int cd_media_session_count = 0;
+static unsigned int cd_media_track_count = 0;
+static unsigned int cd_media_track_count_data = 0;
+static unsigned int cd_media_track_count_audio = 0;
+static unsigned long long int cd_media_session_last_offset = 0;
+
+#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 int is_mounted(const char *device)
+{
+	struct stat statbuf;
+	FILE *fp;
+	int maj, min;
+	int mounted = 0;
+
+	if (stat(device, &statbuf) < 0)
+		return -ENODEV;
+
+	fp = fopen("/proc/self/mountinfo", "r");
+	if (fp == NULL)
+		return -ENOSYS;
+	while (fscanf(fp, "%*s %*s %i:%i %*[^\n]", &maj, &min) == 2) {
+		if (makedev(maj, min) == statbuf.st_rdev) {
+			mounted = 1;
+			break;
+		}
+	}
+	fclose(fp);
+	return mounted;
+}
+
+static void info_scsi_cmd_err(struct udev *udev, char *cmd, int err)
+{
+	if (err == -1) {
+		info(udev, "%s failed\n", cmd);
+		return;
+	}
+	info(udev, "%s failed with SK=%Xh/ASC=%02Xh/ACQ=%02Xh\n", 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)
+{
+	memset(cmd, 0x00, 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)
+		info(udev, "CDROM_CLEAR_OPTIONS, CDO_LOCK failed\n");
+
+	err = ioctl(fd, CDROM_LOCKDOOR, lock ? 1 : 0);
+	if (err < 0)
+		info(udev, "CDROM_LOCKDOOR failed\n");
+
+	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) {
+		info(udev, "CDROM_GET_CAPABILITY failed\n");
+		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) {
+		info(udev, "CDROM_DRIVE_STATUS != CDS_DISC_OK\n");
+		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) {
+		info(udev, "not an MMC unit\n");
+		return -1;
+	}
+
+	info(udev, "INQUIRY: [%.8s][%.16s][%.4s]\n", 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:
+		info(udev, "profile 0x%02x \n", cur_profile);
+		cd_media = 1;
+		cd_media_mo = 1;
+		break;
+	case 0x08:
+		info(udev, "profile 0x%02x media_cd_rom\n", cur_profile);
+		cd_media = 1;
+		cd_media_cd_rom = 1;
+		break;
+	case 0x09:
+		info(udev, "profile 0x%02x media_cd_r\n", cur_profile);
+		cd_media = 1;
+		cd_media_cd_r = 1;
+		break;
+	case 0x0a:
+		info(udev, "profile 0x%02x media_cd_rw\n", cur_profile);
+		cd_media = 1;
+		cd_media_cd_rw = 1;
+		break;
+	case 0x10:
+		info(udev, "profile 0x%02x media_dvd_ro\n", cur_profile);
+		cd_media = 1;
+		cd_media_dvd_rom = 1;
+		break;
+	case 0x11:
+		info(udev, "profile 0x%02x media_dvd_r\n", cur_profile);
+		cd_media = 1;
+		cd_media_dvd_r = 1;
+		break;
+	case 0x12:
+		info(udev, "profile 0x%02x media_dvd_ram\n", cur_profile);
+		cd_media = 1;
+		cd_media_dvd_ram = 1;
+		break;
+	case 0x13:
+		info(udev, "profile 0x%02x media_dvd_rw_ro\n", cur_profile);
+		cd_media = 1;
+		cd_media_dvd_rw = 1;
+		cd_media_dvd_rw_ro = 1;
+		break;
+	case 0x14:
+		info(udev, "profile 0x%02x media_dvd_rw_seq\n", cur_profile);
+		cd_media = 1;
+		cd_media_dvd_rw = 1;
+		cd_media_dvd_rw_seq = 1;
+		break;
+	case 0x1B:
+		info(udev, "profile 0x%02x media_dvd_plus_r\n", cur_profile);
+		cd_media = 1;
+		cd_media_dvd_plus_r = 1;
+		break;
+	case 0x1A:
+		info(udev, "profile 0x%02x media_dvd_plus_rw\n", cur_profile);
+		cd_media = 1;
+		cd_media_dvd_plus_rw = 1;
+		break;
+	case 0x2A:
+		info(udev, "profile 0x%02x media_dvd_plus_rw_dl\n", cur_profile);
+		cd_media = 1;
+		cd_media_dvd_plus_rw_dl = 1;
+		break;
+	case 0x2B:
+		info(udev, "profile 0x%02x media_dvd_plus_r_dl\n", cur_profile);
+		cd_media = 1;
+		cd_media_dvd_plus_r_dl = 1;
+		break;
+	case 0x40:
+		info(udev, "profile 0x%02x media_bd\n", cur_profile);
+		cd_media = 1;
+		cd_media_bd = 1;
+		break;
+	case 0x41:
+	case 0x42:
+		info(udev, "profile 0x%02x media_bd_r\n", cur_profile);
+		cd_media = 1;
+		cd_media_bd_r = 1;
+		break;
+	case 0x43:
+		info(udev, "profile 0x%02x media_bd_re\n", cur_profile);
+		cd_media = 1;
+		cd_media_bd_re = 1;
+		break;
+	case 0x50:
+		info(udev, "profile 0x%02x media_hddvd\n", cur_profile);
+		cd_media = 1;
+		cd_media_hddvd = 1;
+		break;
+	case 0x51:
+		info(udev, "profile 0x%02x media_hddvd_r\n", cur_profile);
+		cd_media = 1;
+		cd_media_hddvd_r = 1;
+		break;
+	case 0x52:
+		info(udev, "profile 0x%02x media_hddvd_rw\n", cur_profile);
+		cd_media = 1;
+		cd_media_hddvd_rw = 1;
+		break;
+	default:
+		info(udev, "profile 0x%02x <ignored>\n", 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:
+			info(udev, "profile 0x%02x mo\n", profile);
+			cd_mo = 1;
+			break;
+		case 0x08:
+			info(udev, "profile 0x%02x cd_rom\n", profile);
+			cd_cd_rom = 1;
+			break;
+		case 0x09:
+			info(udev, "profile 0x%02x cd_r\n", profile);
+			cd_cd_r = 1;
+			break;
+		case 0x0A:
+			info(udev, "profile 0x%02x cd_rw\n", profile);
+			cd_cd_rw = 1;
+			break;
+		case 0x10:
+			info(udev, "profile 0x%02x dvd_rom\n", profile);
+			cd_dvd_rom = 1;
+			break;
+		case 0x12:
+			info(udev, "profile 0x%02x dvd_ram\n", profile);
+			cd_dvd_ram = 1;
+			break;
+		case 0x13:
+		case 0x14:
+			info(udev, "profile 0x%02x dvd_rw\n", profile);
+			cd_dvd_rw = 1;
+			break;
+		case 0x1B:
+			info(udev, "profile 0x%02x dvd_plus_r\n", profile);
+			cd_dvd_plus_r = 1;
+			break;
+		case 0x1A:
+			info(udev, "profile 0x%02x dvd_plus_rw\n", profile);
+			cd_dvd_plus_rw = 1;
+			break;
+		case 0x2A:
+			info(udev, "profile 0x%02x dvd_plus_rw_dl\n", profile);
+			cd_dvd_plus_rw_dl = 1;
+			break;
+		case 0x2B:
+			info(udev, "profile 0x%02x dvd_plus_r_dl\n", profile);
+			cd_dvd_plus_r_dl = 1;
+			break;
+		case 0x40:
+			cd_bd = 1;
+			info(udev, "profile 0x%02x bd\n", profile);
+			break;
+		case 0x41:
+		case 0x42:
+			cd_bd_r = 1;
+			info(udev, "profile 0x%02x bd_r\n", profile);
+			break;
+		case 0x43:
+			cd_bd_re = 1;
+			info(udev, "profile 0x%02x bd_re\n", profile);
+			break;
+		case 0x50:
+			cd_hddvd = 1;
+			info(udev, "profile 0x%02x hddvd\n", profile);
+			break;
+		case 0x51:
+			cd_hddvd_r = 1;
+			info(udev, "profile 0x%02x hddvd_r\n", profile);
+			break;
+		case 0x52:
+			cd_hddvd_rw = 1;
+			info(udev, "profile 0x%02x hddvd_rw\n", profile);
+			break;
+		default:
+			info(udev, "profile 0x%02x <ignored>\n", 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) {
+			info(udev, "no current profile, but disc is present; assuming CD-ROM\n");
+			cd_media_cd_rom = 1;
+			return 0;
+		} else {
+			info(udev, "no current profile, assuming no media\n");
+			return -1;
+		}
+	};
+
+	cd_media = 1;
+
+	if (header[2] & 16) {
+		cd_media_cd_rw = 1;
+		info(udev, "profile 0x0a media_cd_rw\n");
+	} else if ((header[2] & 3) < 2 && cd_cd_r) {
+		cd_media_cd_r = 1;
+		info(udev, "profile 0x09 media_cd_r\n");
+	} else {
+		cd_media_cd_rom = 1;
+		info(udev, "profile 0x08 media_cd_rom\n");
+	}
+	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) {
+			info(udev, "drive is pre-MMC2 and does not support 46h get configuration command\n");
+			info(udev, "trying to work around the problem\n");
+			ret = cd_profiles_old_mmc(udev, fd);
+		}
+		goto out;
+	}
+
+	cur_profile = features[6] << 8 | features[7];
+	if (cur_profile > 0) {
+		info(udev, "current profile 0x%02x\n", cur_profile);
+		feature_profile_media (udev, cur_profile);
+		ret = 0; /* we have media */
+	} else {
+		info(udev, "no current profile, assuming no media\n");
+	}
+
+	len = features[0] << 24 | features[1] << 16 | features[2] << 8 | features[3];
+	info(udev, "GET CONFIGURATION: size of features buffer 0x%04x\n", len);
+
+	if (len > sizeof(features)) {
+		info(udev, "can not get features in a single query, truncating\n");
+		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];
+	info(udev, "GET CONFIGURATION: size of features buffer 0x%04x\n", len);
+
+	if (len > sizeof(features)) {
+		info(udev, "can not get features in a single query, truncating\n");
+		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:
+			info(udev, "GET CONFIGURATION: feature 'profiles', with %i entries\n", features[i+3] / 4);
+			feature_profiles(udev, &features[i]+4, features[i+3]);
+			break;
+		default:
+			info(udev, "GET CONFIGURATION: feature 0x%04x <ignored>, with 0x%02x bytes\n", 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;
+	info(udev, "disk type %02x\n", header[8]);
+	info(udev, "hardware reported media status: %s\n", 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];
+				info(udev, "write-protected DVD-RAM media inserted\n");
+				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) {
+				info(udev, "invalid format capacities length\n");
+				return -1;
+			}
+
+			switch(format[8] & 3) {
+			    case 1:
+				info(udev, "unformatted DVD-RAM media inserted\n");
+				/* 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:
+				info(udev, "formatted DVD-RAM media inserted\n");
+				break;
+
+			    case 3:
+				cd_media = 0; //return no media
+				info(udev, "format capacities returned no media\n");
+				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];
+			info(udev, "no data in blocks 0 or 16, assuming blank\n");
+		} else {
+			info(udev, "data in blocks 0 or 16, assuming complete\n");
+		}
+	}
+
+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;
+	info(udev, "READ TOC: len: %d, start track: %d, end track: %d\n", 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];
+		info(udev, "track=%u info=0x%x(%s) start_block=%u\n",
+		     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];
+	info(udev, "last track %u starts at block %u\n", 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;
+
+	udev_log_init("cdrom_id");
+	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;
+			if (udev_get_log_priority(udev) < LOG_INFO)
+				udev_set_log_priority(udev, LOG_INFO);
+			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) {
+		err(udev, "no device\n");
+		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|(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) {
+		info(udev, "unable to open '%s'\n", node);
+		fprintf(stderr, "unable to open '%s'\n", node);
+		rc = 1;
+		goto exit;
+	}
+	info(udev, "probing: '%s'\n", 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) {
+		info(udev, "PREVENT_ALLOW_MEDIUM_REMOVAL (lock)\n");
+		media_lock(udev, fd, true);
+	}
+
+	if (unlock && cd_media) {
+		info(udev, "PREVENT_ALLOW_MEDIUM_REMOVAL (unlock)\n");
+		media_lock(udev, fd, false);
+	}
+
+	if (eject) {
+		info(udev, "PREVENT_ALLOW_MEDIUM_REMOVAL (unlock)\n");
+		media_lock(udev, fd, false);
+		info(udev, "START_STOP_UNIT (eject)\n");
+		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);
+	udev_log_close();
+	return rc;
+}