Adding upstream version 252.22.upstream/252.22upstream

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>

1 files changed, 1017 insertions, 0 deletions

diff --git a/src/udev/cdrom_id/cdrom_id.c b/src/udev/cdrom_id/cdrom_id.c
new file mode 100644
index 0000000..1d3201a
--- /dev/null
+++ b/src/udev/cdrom_id/cdrom_id.c
@@ -0,0 +1,1017 @@
+/* SPDX-License-Identifier: GPL-2.0-or-later */
+/*
+ * cdrom_id - optical drive and media information prober
+ */
+
+#include <fcntl.h>
+#include <getopt.h>
+#include <linux/cdrom.h>
+#include <scsi/sg.h>
+#include <sys/ioctl.h>
+#include <unistd.h>
+
+#include "fd-util.h"
+#include "main-func.h"
+#include "memory-util.h"
+#include "random-util.h"
+#include "sort-util.h"
+#include "string-table.h"
+#include "string-util.h"
+#include "udev-util.h"
+#include "unaligned.h"
+
+static bool arg_eject = false;
+static bool arg_lock = false;
+static bool arg_unlock = false;
+static const char *arg_node = NULL;
+
+typedef enum Feature {
+        FEATURE_RW_NONREMOVABLE = 0x01,
+        FEATURE_RW_REMOVABLE    = 0x02,
+
+        FEATURE_MO_SE           = 0x03, /* sector erase */
+        FEATURE_MO_WO           = 0x04, /* write once */
+        FEATURE_MO_AS           = 0x05, /* advance storage */
+
+        FEATURE_CD_ROM          = 0x08,
+        FEATURE_CD_R            = 0x09,
+        FEATURE_CD_RW           = 0x0a,
+
+        FEATURE_DVD_ROM         = 0x10,
+        FEATURE_DVD_R           = 0x11,
+        FEATURE_DVD_RAM         = 0x12,
+        FEATURE_DVD_RW_RO       = 0x13, /* restricted overwrite mode */
+        FEATURE_DVD_RW_SEQ      = 0x14, /* sequential mode */
+        FEATURE_DVD_R_DL_SEQ    = 0x15, /* sequential recording */
+        FEATURE_DVD_R_DL_JR     = 0x16, /* jump recording */
+        FEATURE_DVD_RW_DL       = 0x17,
+        FEATURE_DVD_R_DDR       = 0x18, /* download disc recording - dvd for css managed recording */
+        FEATURE_DVD_PLUS_RW     = 0x1a,
+        FEATURE_DVD_PLUS_R      = 0x1b,
+
+        FEATURE_DDCD_ROM        = 0x20,
+        FEATURE_DDCD_R          = 0x21,
+        FEATURE_DDCD_RW         = 0x22,
+
+        FEATURE_DVD_PLUS_RW_DL  = 0x2a,
+        FEATURE_DVD_PLUS_R_DL   = 0x2b,
+
+        FEATURE_BD              = 0x40,
+        FEATURE_BD_R_SRM        = 0x41, /* sequential recording mode */
+        FEATURE_BD_R_RRM        = 0x42, /* random recording mode */
+        FEATURE_BD_RE           = 0x43,
+
+        FEATURE_HDDVD           = 0x50,
+        FEATURE_HDDVD_R         = 0x51,
+        FEATURE_HDDVD_RAM       = 0x52,
+        FEATURE_HDDVD_RW        = 0x53,
+        FEATURE_HDDVD_R_DL      = 0x58,
+        FEATURE_HDDVD_RW_DL     = 0x5a,
+
+        FEATURE_MRW,
+        FEATURE_MRW_W,
+
+        _FEATURE_MAX,
+        _FEATURE_INVALID = -EINVAL,
+} Feature;
+
+typedef enum MediaState {
+        MEDIA_STATE_BLANK      = 0,
+        MEDIA_STATE_APPENDABLE = 1,
+        MEDIA_STATE_COMPLETE   = 2,
+        MEDIA_STATE_OTHER      = 3,
+        _MEDIA_STATE_MAX,
+        _MEDIA_STATE_INVALID = -EINVAL,
+} MediaState;
+
+typedef struct Context {
+        int fd;
+
+        Feature *drive_features;
+        size_t n_drive_feature;
+
+        Feature media_feature;
+        bool has_media;
+
+        MediaState media_state;
+        unsigned media_session_next;
+        unsigned media_session_count;
+        unsigned media_track_count;
+        unsigned media_track_count_data;
+        unsigned media_track_count_audio;
+        uint64_t media_session_last_offset;
+} Context;
+
+#define CONTEXT_EMPTY {                                 \
+                .fd = -1,                               \
+                .media_feature = _FEATURE_INVALID,      \
+                .media_state = _MEDIA_STATE_INVALID,    \
+        }
+
+static void context_clear(Context *c) {
+        if (!c)
+                return;
+
+        safe_close(c->fd);
+        free(c->drive_features);
+}
+
+static bool drive_has_feature(const Context *c, Feature f) {
+        assert(c);
+
+        for (size_t i = 0; i < c->n_drive_feature; i++)
+                if (c->drive_features[i] == f)
+                        return true;
+
+        return false;
+}
+
+static int set_drive_feature(Context *c, Feature f) {
+        assert(c);
+
+        if (drive_has_feature(c, f))
+                return 0;
+
+        if (!GREEDY_REALLOC(c->drive_features, c->n_drive_feature + 1))
+                return -ENOMEM;
+
+        c->drive_features[c->n_drive_feature++] = f;
+        return 1;
+}
+
+#define ERRCODE(s)      ((((s)[2] & 0x0F) << 16) | ((s)[12] << 8) | ((s)[13]))
+#define SK(errcode)     (((errcode) >> 16) & 0xFU)
+#define ASC(errcode)    (((errcode) >> 8) & 0xFFU)
+#define ASCQ(errcode)   ((errcode) & 0xFFU)
+#define CHECK_CONDITION 0x01
+
+static int log_scsi_debug_errno(int error, const char *msg) {
+        assert(error != 0);
+
+        /* error < 0 means errno-style error, error > 0 means SCSI error */
+
+        if (error < 0)
+                return log_debug_errno(error, "Failed to %s: %m", msg);
+
+        return log_debug_errno(SYNTHETIC_ERRNO(EIO),
+                               "Failed to %s with SK=%X/ASC=%02X/ACQ=%02X",
+                               msg, SK(error), ASC(error), ASCQ(error));
+}
+
+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 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 scsi_cmd *cmd, size_t i, unsigned char arg) {
+        cmd->sg_io.cmd_len = i + 1;
+        cmd->cgc.cmd[i] = arg;
+}
+
+static int scsi_cmd_run(struct scsi_cmd *cmd, int fd, unsigned char *buf, size_t bufsize) {
+        int r;
+
+        assert(cmd);
+        assert(fd >= 0);
+        assert(buf || bufsize == 0);
+
+        /* Return 0 on success. On failure, return negative errno or positive error code. */
+
+        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) < 0)
+                return -errno;
+
+        if ((cmd->sg_io.info & SG_INFO_OK_MASK) != SG_INFO_OK) {
+                if (cmd->sg_io.masked_status & CHECK_CONDITION) {
+                        r = ERRCODE(cmd->_sense.u);
+                        if (r != 0)
+                                return r;
+                }
+                return -EIO;
+        }
+
+        return 0;
+}
+
+static int scsi_cmd_run_and_log(struct scsi_cmd *cmd, int fd, unsigned char *buf, size_t bufsize, const char *msg) {
+        int r;
+
+        assert(msg);
+
+        r = scsi_cmd_run(cmd, fd, buf, bufsize);
+        if (r != 0)
+                return log_scsi_debug_errno(r, msg);
+
+        return 0;
+}
+
+static int media_lock(int fd, bool lock) {
+        /* disable the kernel's lock logic */
+        if (ioctl(fd, CDROM_CLEAR_OPTIONS, CDO_LOCK) < 0)
+                log_debug_errno(errno, "Failed to issue ioctl(CDROM_CLEAR_OPTIONS, CDO_LOCK), ignoring: %m");
+
+        if (ioctl(fd, CDROM_LOCKDOOR, lock ? 1 : 0) < 0)
+                return log_debug_errno(errno, "Failed to issue ioctl(CDROM_LOCKDOOR): %m");
+
+        return 0;
+}
+
+static int media_eject(int fd) {
+        struct scsi_cmd sc;
+
+        scsi_cmd_init(&sc);
+        scsi_cmd_set(&sc, 0, GPCMD_START_STOP_UNIT);
+        scsi_cmd_set(&sc, 4, 0x02);
+        scsi_cmd_set(&sc, 5, 0);
+
+        return scsi_cmd_run_and_log(&sc, fd, NULL, 0, "start/stop unit");
+}
+
+static int cd_capability_compat(Context *c) {
+        int capability, r;
+
+        assert(c);
+
+        capability = ioctl(c->fd, CDROM_GET_CAPABILITY, NULL);
+        if (capability < 0)
+                return log_debug_errno(errno, "CDROM_GET_CAPABILITY failed");
+
+        if (capability & CDC_CD_R) {
+                r = set_drive_feature(c, FEATURE_CD_R);
+                if (r < 0)
+                        return log_oom_debug();
+        }
+        if (capability & CDC_CD_RW) {
+                r = set_drive_feature(c, FEATURE_CD_RW);
+                if (r < 0)
+                        return log_oom_debug();
+        }
+        if (capability & CDC_DVD) {
+                r = set_drive_feature(c, FEATURE_DVD_ROM);
+                if (r < 0)
+                        return log_oom_debug();
+        }
+        if (capability & CDC_DVD_R) {
+                r = set_drive_feature(c, FEATURE_DVD_R);
+                if (r < 0)
+                        return log_oom_debug();
+        }
+        if (capability & CDC_DVD_RAM) {
+                r = set_drive_feature(c, FEATURE_DVD_RAM);
+                if (r < 0)
+                        return log_oom_debug();
+        }
+        if (capability & CDC_MRW) {
+                r = set_drive_feature(c, FEATURE_MRW);
+                if (r < 0)
+                        return log_oom_debug();
+        }
+        if (capability & CDC_MRW_W) {
+                r = set_drive_feature(c, FEATURE_MRW_W);
+                if (r < 0)
+                        return log_oom_debug();
+        }
+
+        return 0;
+}
+
+static int cd_media_compat(Context *c) {
+        int r;
+
+        assert(c);
+
+        r = ioctl(c->fd, CDROM_DRIVE_STATUS, CDSL_CURRENT);
+        if (r < 0)
+                return log_debug_errno(errno, "ioctl(CDROM_DRIVE_STATUS) failed: %m");
+        if (r != CDS_DISC_OK)
+                return log_debug_errno(SYNTHETIC_ERRNO(ENOMEDIUM),
+                                       "ioctl(CDROM_DRIVE_STATUS) → %d (%s), ignoring.",
+                                       r,
+                                       r == CDS_NO_INFO ? "no info" :
+                                       r == CDS_NO_DISC ? "no disc" :
+                                       r == CDS_TRAY_OPEN ? "tray open" :
+                                       r == CDS_DRIVE_NOT_READY ? "drive not ready" :
+                                       "unknown status");
+
+        c->has_media = true;
+        return 0;
+}
+
+static int cd_inquiry(Context *c) {
+        struct scsi_cmd sc;
+        unsigned char inq[36];
+        int r;
+
+        assert(c);
+
+        scsi_cmd_init(&sc);
+        scsi_cmd_set(&sc, 0, GPCMD_INQUIRY);
+        scsi_cmd_set(&sc, 4, sizeof(inq));
+        scsi_cmd_set(&sc, 5, 0);
+        r = scsi_cmd_run_and_log(&sc, c->fd, inq, sizeof(inq), "inquire");
+        if (r < 0)
+                return r;
+
+        if ((inq[0] & 0x1F) != 5)
+                return log_debug_errno(SYNTHETIC_ERRNO(EINVAL), "Not an MMC unit.");
+
+        log_debug("INQUIRY: [%.8s][%.16s][%.4s]", inq + 8, inq + 16, inq + 32);
+        return 0;
+}
+
+static int feature_profiles(Context *c, const unsigned char *profiles, size_t size) {
+        int r;
+
+        assert(c);
+
+        for (size_t i = 0; i + 4 <= size; i += 4) {
+                r = set_drive_feature(c, (Feature) unaligned_read_be16(&profiles[i]));
+                if (r < 0)
+                        return log_oom_debug();
+        }
+
+        return 1;
+}
+
+static int cd_profiles_old_mmc(Context *c) {
+        disc_information discinfo;
+        struct scsi_cmd sc;
+        size_t len;
+        int r;
+
+        assert(c);
+
+        scsi_cmd_init(&sc);
+        scsi_cmd_set(&sc, 0, GPCMD_READ_DISC_INFO);
+        scsi_cmd_set(&sc, 8, sizeof(discinfo.disc_information_length));
+        scsi_cmd_set(&sc, 9, 0);
+        r = scsi_cmd_run_and_log(&sc, c->fd, (unsigned char *)&discinfo.disc_information_length, sizeof(discinfo.disc_information_length), "read disc information");
+        if (r >= 0) {
+                /* Not all drives have the same disc_info length, so requeue
+                 * packet with the length the drive tells us it can supply */
+                len = be16toh(discinfo.disc_information_length) + sizeof(discinfo.disc_information_length);
+                if (len > sizeof(discinfo))
+                        len = sizeof(discinfo);
+
+                scsi_cmd_init(&sc);
+                scsi_cmd_set(&sc, 0, GPCMD_READ_DISC_INFO);
+                scsi_cmd_set(&sc, 8, len);
+                scsi_cmd_set(&sc, 9, 0);
+                r = scsi_cmd_run_and_log(&sc, c->fd, (unsigned char *)&discinfo, len, "read disc information");
+        }
+        if (r < 0) {
+                if (c->has_media) {
+                        log_debug("No current profile, but disc is present; assuming CD-ROM.");
+                        c->media_feature = FEATURE_CD_ROM;
+                        c->media_track_count = 1;
+                        c->media_track_count_data = 1;
+                        return 1;
+                } else
+                        return log_debug_errno(SYNTHETIC_ERRNO(ENOMEDIUM),
+                                               "no current profile, assuming no media.");
+        };
+
+        c->has_media = true;
+
+        if (discinfo.erasable)
+                c->media_feature = FEATURE_CD_RW;
+        else if (discinfo.disc_status < 2 && drive_has_feature(c, FEATURE_CD_R))
+                c->media_feature = FEATURE_CD_R;
+        else
+                c->media_feature = FEATURE_CD_ROM;
+
+        return 0;
+}
+
+static int cd_profiles(Context *c) {
+        struct scsi_cmd sc;
+        unsigned char features[65530];
+        unsigned cur_profile;
+        size_t len;
+        int r;
+
+        assert(c);
+
+        /* First query the current profile */
+        scsi_cmd_init(&sc);
+        scsi_cmd_set(&sc, 0, GPCMD_GET_CONFIGURATION);
+        scsi_cmd_set(&sc, 8, 8);
+        scsi_cmd_set(&sc, 9, 0);
+        r = scsi_cmd_run(&sc, c->fd, features, 8);
+        if (r != 0) {
+                /* handle pre-MMC2 drives which do not support GET CONFIGURATION */
+                if (r > 0 && SK(r) == 0x5 && IN_SET(ASC(r), 0x20, 0x24)) {
+                        log_debug("Drive is pre-MMC2 and does not support 46h get configuration command; "
+                                  "trying to work around the problem.");
+                        return cd_profiles_old_mmc(c);
+                }
+
+                return log_scsi_debug_errno(r, "get configuration");
+        }
+
+        cur_profile = unaligned_read_be16(&features[6]);
+        if (cur_profile > 0) {
+                log_debug("current profile 0x%02x", cur_profile);
+                c->media_feature = (Feature) cur_profile;
+                c->has_media = true;
+        } else {
+                log_debug("no current profile, assuming no media");
+                c->has_media = false;
+        }
+
+        len = unaligned_read_be32(features);
+        log_debug("GET CONFIGURATION: size of features buffer %zu", len);
+
+        if (len > sizeof(features)) {
+                log_debug("Cannot 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(&sc);
+        scsi_cmd_set(&sc, 0, GPCMD_GET_CONFIGURATION);
+        scsi_cmd_set(&sc, 7, (len >> 8) & 0xff);
+        scsi_cmd_set(&sc, 8, len & 0xff);
+        scsi_cmd_set(&sc, 9, 0);
+        r = scsi_cmd_run_and_log(&sc, c->fd, features, len, "get configuration");
+        if (r < 0)
+                return r;
+
+        /* parse the length once more, in case the drive decided to have other features suddenly :) */
+        len = unaligned_read_be32(features);
+        log_debug("GET CONFIGURATION: size of features buffer %zu", len);
+
+        if (len > sizeof(features)) {
+                log_debug("Cannot get features in a single query, truncating.");
+                len = sizeof(features);
+        }
+
+        /* device features */
+        for (size_t i = 8; i + 4 < len; i += 4 + features[i + 3]) {
+                unsigned feature;
+
+                feature = unaligned_read_be16(&features[i]);
+
+                switch (feature) {
+                case 0x00:
+                        log_debug("GET CONFIGURATION: feature 'profiles', with %u entries", features[i + 3] / 4);
+                        feature_profiles(c, features + i + 4, MIN(features[i + 3], len - i - 4));
+                        break;
+                default:
+                        log_debug("GET CONFIGURATION: feature 0x%04x <ignored>, with 0x%02x bytes", feature, features[i + 3]);
+                        break;
+                }
+        }
+
+        return c->has_media;
+}
+
+static const char * const media_state_table[_MEDIA_STATE_MAX] = {
+        [MEDIA_STATE_BLANK]      = "blank",
+        [MEDIA_STATE_APPENDABLE] = "appendable",
+        [MEDIA_STATE_COMPLETE]   = "complete",
+        [MEDIA_STATE_OTHER]      = "other",
+};
+
+DEFINE_PRIVATE_STRING_TABLE_LOOKUP_TO_STRING(media_state, MediaState);
+
+static int dvd_ram_media_update_state(Context *c) {
+        struct scsi_cmd sc;
+        unsigned char dvdstruct[8];
+        unsigned char format[12];
+        unsigned char len;
+        int r;
+
+        assert(c);
+
+        /* Return 1 if media state is determined. */
+
+        if (c->media_feature != FEATURE_DVD_RAM)
+                return 0;
+
+        /* a write protected dvd-ram may report "complete" status */
+        scsi_cmd_init(&sc);
+        scsi_cmd_set(&sc, 0, GPCMD_READ_DVD_STRUCTURE);
+        scsi_cmd_set(&sc, 7, 0xC0);
+        scsi_cmd_set(&sc, 9, sizeof(dvdstruct));
+        scsi_cmd_set(&sc, 11, 0);
+        r = scsi_cmd_run_and_log(&sc, c->fd, dvdstruct, sizeof(dvdstruct), "read DVD structure");
+        if (r < 0)
+                return r;
+
+        if (dvdstruct[4] & 0x02) {
+                c->media_state = MEDIA_STATE_COMPLETE;
+                log_debug("Write-protected DVD-RAM media inserted");
+                return 1;
+        }
+
+        /* let's make sure we don't try to read unformatted media */
+        scsi_cmd_init(&sc);
+        scsi_cmd_set(&sc, 0, GPCMD_READ_FORMAT_CAPACITIES);
+        scsi_cmd_set(&sc, 8, sizeof(format));
+        scsi_cmd_set(&sc, 9, 0);
+        r = scsi_cmd_run_and_log(&sc, c->fd, format, sizeof(format), "read DVD format capacities");
+        if (r < 0)
+                return r;
+
+        len = format[3];
+        if (len & 7 || len < 16)
+                return log_debug_errno(SYNTHETIC_ERRNO(EINVAL),
+                                       "Invalid format capacities length.");
+
+        switch (format[8] & 3) {
+        case 1:
+                /* 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. */
+                log_debug("Unformatted DVD-RAM media inserted.");
+                return 1;
+
+        case 2:
+                log_debug("Formatted DVD-RAM media inserted.");
+                return 0;
+
+        case 3:
+                c->has_media = false;
+                return log_debug_errno(SYNTHETIC_ERRNO(ENOMEDIUM),
+                                       "Format capacities returned no media.");
+        }
+
+        return 0;
+}
+
+static int dvd_media_update_state(Context *c) {
+        struct scsi_cmd sc;
+        unsigned char buffer[32 * 2048];
+        int r;
+
+        r = dvd_ram_media_update_state(c);
+        if (r != 0)
+                return r;
+
+        /* 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(&sc);
+        scsi_cmd_set(&sc, 0, GPCMD_READ_10);
+        scsi_cmd_set(&sc, 5, 0);
+        scsi_cmd_set(&sc, 8, sizeof(buffer)/2048);
+        scsi_cmd_set(&sc, 9, 0);
+        r = scsi_cmd_run_and_log(&sc, c->fd, buffer, sizeof(buffer), "read first 32 blocks");
+        if (r < 0) {
+                c->has_media = false;
+                return r;
+        }
+
+        /* 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 */
+
+        for (size_t offset = 32768; offset < 32768 + 2048; offset++)
+                if (buffer[offset] != 0) {
+                        log_debug("Data in block 16, assuming complete.");
+                        return 0;
+                }
+
+        for (size_t offset = 0; offset < 2048; offset++)
+                if (buffer[offset] != 0) {
+                        log_debug("Data in block 0, assuming complete.");
+                        return 0;
+                }
+
+        log_debug("No data in blocks 0 or 16, assuming blank.");
+        c->media_state = MEDIA_STATE_BLANK;
+        return 0;
+}
+
+static int cd_media_info(Context *c) {
+        struct scsi_cmd sc;
+        unsigned char header[32];
+        MediaState state;
+        int r;
+
+        assert(c);
+
+        scsi_cmd_init(&sc);
+        scsi_cmd_set(&sc, 0, GPCMD_READ_DISC_INFO);
+        scsi_cmd_set(&sc, 8, sizeof(header));
+        scsi_cmd_set(&sc, 9, 0);
+        r = scsi_cmd_run_and_log(&sc, c->fd, header, sizeof(header), "read disc information");
+        if (r < 0)
+                return r;
+
+        c->has_media = true;
+        log_debug("disk type %02x", header[8]);
+
+        state = (MediaState) (header[2] & 0x03);
+        log_debug("hardware reported media status: %s", strna(media_state_to_string(state)));
+
+        /* exclude plain CDROM, some fake cdroms return 0 for "blank" media here */
+        if (c->media_feature != FEATURE_CD_ROM)
+                c->media_state = state;
+
+        /* fresh DVD-RW in restricted overwrite mode reports itself as
+         * "appendable"; change it to "blank" to make it consistent with what
+         * gets reported after blanking, and what userspace expects. */
+        if (c->media_feature == FEATURE_DVD_RW_RO && state == MEDIA_STATE_APPENDABLE)
+                c->media_state = MEDIA_STATE_BLANK;
+
+        /* 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 (IN_SET(c->media_feature, FEATURE_DVD_RW_RO, FEATURE_DVD_PLUS_RW, FEATURE_DVD_PLUS_RW_DL, FEATURE_DVD_RAM) &&
+            IN_SET(state, MEDIA_STATE_COMPLETE, MEDIA_STATE_OTHER)) {
+                r = dvd_media_update_state(c);
+                if (r < 0)
+                        return r;
+        }
+
+        /* "other" is e. g. DVD-RAM, can't append sessions there; DVDs in
+         * restricted overwrite mode can never append, only in sequential mode */
+        if (c->media_feature != FEATURE_DVD_RW_RO && IN_SET(state, MEDIA_STATE_BLANK, MEDIA_STATE_APPENDABLE))
+                c->media_session_next = header[10] << 8 | header[5];
+        c->media_session_count = header[9] << 8 | header[4];
+        c->media_track_count = header[11] << 8 | header[6];
+
+        return 0;
+}
+
+static int cd_media_toc(Context *c) {
+        struct scsi_cmd sc;
+        unsigned char header[12];
+        unsigned char toc[65536];
+        unsigned num_tracks;
+        size_t len;
+        int r;
+
+        assert(c);
+
+        scsi_cmd_init(&sc);
+        scsi_cmd_set(&sc, 0, GPCMD_READ_TOC_PMA_ATIP);
+        scsi_cmd_set(&sc, 6, 1);
+        scsi_cmd_set(&sc, 8, sizeof(header));
+        scsi_cmd_set(&sc, 9, 0);
+        r = scsi_cmd_run_and_log(&sc, c->fd, header, sizeof(header), "read TOC");
+        if (r < 0)
+                return r;
+
+        len = unaligned_read_be16(header) + 2;
+        log_debug("READ TOC: len: %zu, start track: %u, end track: %u", len, header[2], header[3]);
+
+        if (len > sizeof(toc))
+                return -1;
+        /* empty media has no tracks */
+        if (len < 8)
+                return 0;
+
+        /* 2: first track, 3: last track */
+        num_tracks = header[3] - header[2] + 1;
+
+        scsi_cmd_init(&sc);
+        scsi_cmd_set(&sc, 0, GPCMD_READ_TOC_PMA_ATIP);
+        scsi_cmd_set(&sc, 6, header[2]); /* First Track/Session Number */
+        scsi_cmd_set(&sc, 7, (len >> 8) & 0xff);
+        scsi_cmd_set(&sc, 8, len & 0xff);
+        scsi_cmd_set(&sc, 9, 0);
+        r = scsi_cmd_run_and_log(&sc, c->fd, toc, len, "read TOC (tracks)");
+        if (r < 0)
+                return r;
+
+        /* 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 (size_t i = 4; i + 8 <= len && num_tracks > 0; i += 8, --num_tracks) {
+                bool is_data_track;
+                uint32_t block;
+
+                is_data_track = (toc[i + 1] & 0x04) != 0;
+                block = unaligned_read_be32(&toc[i + 4]);
+
+                log_debug("track=%u info=0x%x(%s) start_block=%"PRIu32,
+                          toc[i + 2], toc[i + 1] & 0x0FU, is_data_track ? "data":"audio", block);
+
+                if (is_data_track)
+                        c->media_track_count_data++;
+                else
+                        c->media_track_count_audio++;
+        }
+
+        scsi_cmd_init(&sc);
+        scsi_cmd_set(&sc, 0, GPCMD_READ_TOC_PMA_ATIP);
+        scsi_cmd_set(&sc, 2, 1); /* Session Info */
+        scsi_cmd_set(&sc, 8, sizeof(header));
+        scsi_cmd_set(&sc, 9, 0);
+        r = scsi_cmd_run_and_log(&sc, c->fd, header, sizeof(header), "read TOC (multi session)");
+        if (r < 0)
+                return r;
+
+        len = unaligned_read_be32(&header[8]);
+        log_debug("last track %u starts at block %zu", header[4+2], len);
+        c->media_session_last_offset = (uint64_t) len * 2048;
+
+        return 0;
+}
+
+static int open_drive(Context *c) {
+        int fd;
+
+        assert(c);
+        assert(c->fd < 0);
+
+        for (int cnt = 0;; cnt++) {
+                fd = open(arg_node, O_RDONLY|O_NONBLOCK|O_CLOEXEC|O_NOCTTY);
+                if (fd >= 0)
+                        break;
+                if (++cnt >= 20 || errno != EBUSY)
+                        return log_debug_errno(errno, "Unable to open '%s': %m", arg_node);
+
+                (void) usleep(100 * USEC_PER_MSEC + random_u64_range(100 * USEC_PER_MSEC));
+        }
+
+        log_debug("probing: '%s'", arg_node);
+        c->fd = fd;
+        return 0;
+}
+
+typedef struct FeatureToString {
+        Feature feature;
+        const char *str;
+} FeatureToString;
+
+static const FeatureToString feature_to_string[] = {
+        { .feature = FEATURE_RW_NONREMOVABLE, .str = "RW_NONREMOVABLE", },
+        { .feature = FEATURE_RW_REMOVABLE,    .str = "RW_REMOVABLE", },
+
+        { .feature = FEATURE_MO_SE,           .str = "MO_SE", },
+        { .feature = FEATURE_MO_WO,           .str = "MO_WO", },
+        { .feature = FEATURE_MO_AS,           .str = "MO_AS", },
+
+        { .feature = FEATURE_CD_ROM,          .str = "CD", },
+        { .feature = FEATURE_CD_R,            .str = "CD_R", },
+        { .feature = FEATURE_CD_RW,           .str = "CD_RW", },
+
+        { .feature = FEATURE_DVD_ROM,         .str = "DVD", },
+        { .feature = FEATURE_DVD_R,           .str = "DVD_R", },
+        { .feature = FEATURE_DVD_RAM,         .str = "DVD_RAM", },
+        { .feature = FEATURE_DVD_RW_RO,       .str = "DVD_RW_RO", },
+        { .feature = FEATURE_DVD_RW_SEQ,      .str = "DVD_RW_SEQ", },
+        { .feature = FEATURE_DVD_R_DL_SEQ,    .str = "DVD_R_DL_SEQ", },
+        { .feature = FEATURE_DVD_R_DL_JR,     .str = "DVD_R_DL_JR", },
+        { .feature = FEATURE_DVD_RW_DL,       .str = "DVD_RW_DL", },
+        { .feature = FEATURE_DVD_R_DDR,       .str = "DVD_R_DDR", },
+        { .feature = FEATURE_DVD_PLUS_RW,     .str = "DVD_PLUS_RW", },
+        { .feature = FEATURE_DVD_PLUS_R,      .str = "DVD_PLUS_R", },
+
+        { .feature = FEATURE_DDCD_ROM,        .str = "DDCD", },
+        { .feature = FEATURE_DDCD_R,          .str = "DDCD_R", },
+        { .feature = FEATURE_DDCD_RW,         .str = "DDCD_RW", },
+
+        { .feature = FEATURE_DVD_PLUS_RW_DL,  .str = "DVD_PLUS_RW_DL", },
+        { .feature = FEATURE_DVD_PLUS_R_DL,   .str = "DVD_PLUS_R_DL", },
+
+        { .feature = FEATURE_BD,              .str = "BD", },
+        { .feature = FEATURE_BD_R_SRM,        .str = "BD_R_SRM", },
+        { .feature = FEATURE_BD_R_RRM,        .str = "BD_R_RRM", },
+        { .feature = FEATURE_BD_RE,           .str = "BD_RE", },
+
+        { .feature = FEATURE_HDDVD,           .str = "HDDVD", },
+        { .feature = FEATURE_HDDVD_R,         .str = "HDDVD_R", },
+        { .feature = FEATURE_HDDVD_RAM,       .str = "HDDVD_RAM", },
+        { .feature = FEATURE_HDDVD_RW,        .str = "HDDVD_RW", },
+        { .feature = FEATURE_HDDVD_R_DL,      .str = "HDDVD_R_DL", },
+        { .feature = FEATURE_HDDVD_RW_DL,     .str = "HDDVD_RW_DL", },
+
+        { .feature = FEATURE_MRW,             .str = "MRW", },
+        { .feature = FEATURE_MRW_W,           .str = "MRW_W", },
+};
+
+static int feature_to_string_compare_func(const FeatureToString *a, const FeatureToString *b) {
+        assert(a);
+        assert(b);
+
+        return CMP(a->feature, b->feature);
+}
+
+static void print_feature(Feature feature, const char *prefix) {
+        const FeatureToString *found, in = {
+                .feature = feature,
+        };
+
+        assert(prefix);
+
+        found = typesafe_bsearch(&in, feature_to_string, ELEMENTSOF(feature_to_string), feature_to_string_compare_func);
+        if (!found)
+                return (void) log_debug("Unknown feature 0x%02x, ignoring.", (unsigned) feature);
+
+        printf("%s_%s=1\n", prefix, found->str);
+}
+
+static void print_properties(const Context *c) {
+        const char *state;
+
+        assert(c);
+
+        printf("ID_CDROM=1\n");
+        for (size_t i = 0; i < c->n_drive_feature; i++)
+                print_feature(c->drive_features[i], "ID_CDROM");
+
+        if (drive_has_feature(c, FEATURE_MO_SE) ||
+            drive_has_feature(c, FEATURE_MO_WO) ||
+            drive_has_feature(c, FEATURE_MO_AS))
+                printf("ID_CDROM_MO=1\n");
+
+        if (drive_has_feature(c, FEATURE_DVD_RW_RO) ||
+            drive_has_feature(c, FEATURE_DVD_RW_SEQ))
+                printf("ID_CDROM_DVD_RW=1\n");
+
+        if (drive_has_feature(c, FEATURE_DVD_R_DL_SEQ) ||
+            drive_has_feature(c, FEATURE_DVD_R_DL_JR))
+                printf("ID_CDROM_DVD_R_DL=1\n");
+
+        if (drive_has_feature(c, FEATURE_DVD_R_DDR))
+                printf("ID_CDROM_DVD_R=1\n");
+
+        if (drive_has_feature(c, FEATURE_BD_R_SRM) ||
+            drive_has_feature(c, FEATURE_BD_R_RRM))
+                printf("ID_CDROM_BD_R=1\n");
+
+        if (c->has_media) {
+                printf("ID_CDROM_MEDIA=1\n");
+                print_feature(c->media_feature, "ID_CDROM_MEDIA");
+
+                if (IN_SET(c->media_feature, FEATURE_MO_SE, FEATURE_MO_WO, FEATURE_MO_AS))
+                        printf("ID_CDROM_MEDIA_MO=1\n");
+
+                if (IN_SET(c->media_feature, FEATURE_DVD_RW_RO, FEATURE_DVD_RW_SEQ))
+                        printf("ID_CDROM_MEDIA_DVD_RW=1\n");
+
+                if (IN_SET(c->media_feature, FEATURE_DVD_R_DL_SEQ, FEATURE_DVD_R_DL_JR))
+                        printf("ID_CDROM_MEDIA_DVD_R_DL=1\n");
+
+                if (c->media_feature == FEATURE_DVD_R_DDR)
+                        printf("ID_CDROM_MEDIA_DVD_R=1\n");
+
+                if (IN_SET(c->media_feature, FEATURE_BD_R_SRM, FEATURE_BD_R_RRM))
+                        printf("ID_CDROM_MEDIA_BD_R=1\n");
+        }
+
+        state = media_state_to_string(c->media_state);
+        if (state)
+                printf("ID_CDROM_MEDIA_STATE=%s\n", state);
+        if (c->media_session_next > 0)
+                printf("ID_CDROM_MEDIA_SESSION_NEXT=%u\n", c->media_session_next);
+        if (c->media_session_count > 0)
+                printf("ID_CDROM_MEDIA_SESSION_COUNT=%u\n", c->media_session_count);
+        if (c->media_session_count > 1 && c->media_session_last_offset > 0)
+                printf("ID_CDROM_MEDIA_SESSION_LAST_OFFSET=%" PRIu64 "\n", c->media_session_last_offset);
+        if (c->media_track_count > 0)
+                printf("ID_CDROM_MEDIA_TRACK_COUNT=%u\n", c->media_track_count);
+        if (c->media_track_count_audio > 0)
+                printf("ID_CDROM_MEDIA_TRACK_COUNT_AUDIO=%u\n", c->media_track_count_audio);
+        if (c->media_track_count_data > 0)
+                printf("ID_CDROM_MEDIA_TRACK_COUNT_DATA=%u\n", c->media_track_count_data);
+}
+
+static int help(void) {
+        printf("Usage: %s [options] <device>\n"
+               "  -l --lock-media    lock the media (to enable eject request events)\n"
+               "  -u --unlock-media  unlock the media\n"
+               "  -e --eject-media   eject the media\n"
+               "  -d --debug         print debug messages to stderr\n"
+               "  -h --help          print this help text\n"
+               "\n",
+               program_invocation_short_name);
+
+        return 0;
+}
+
+static int parse_argv(int argc, char *argv[]) {
+        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' },
+                {}
+        };
+        int c;
+
+        while ((c = getopt_long(argc, argv, "deluh", options, NULL)) >= 0)
+                switch (c) {
+                case 'l':
+                        arg_lock = true;
+                        break;
+                case 'u':
+                        arg_unlock = true;
+                        break;
+                case 'e':
+                        arg_eject = true;
+                        break;
+                case 'd':
+                        log_set_target(LOG_TARGET_CONSOLE);
+                        log_set_max_level(LOG_DEBUG);
+                        log_open();
+                        break;
+                case 'h':
+                        return help();
+                default:
+                        assert_not_reached();
+                }
+
+        arg_node = argv[optind];
+        if (!arg_node)
+                return log_error_errno(SYNTHETIC_ERRNO(EINVAL), "No device specified.");
+
+        return 1;
+}
+
+static int run(int argc, char *argv[]) {
+        _cleanup_(context_clear) Context c = CONTEXT_EMPTY;
+        int r;
+
+        log_set_target(LOG_TARGET_AUTO);
+        udev_parse_config();
+        log_parse_environment();
+        log_open();
+
+        r = parse_argv(argc, argv);
+        if (r <= 0)
+                return r;
+
+        r = open_drive(&c);
+        if (r < 0)
+                return r;
+
+        /* same data as original cdrom_id */
+        r = cd_capability_compat(&c);
+        if (r < 0)
+                return r;
+
+        /* check for media - don't bail if there's no media as we still need to
+         * to read profiles */
+        (void) cd_media_compat(&c);
+
+        /* check if drive talks MMC */
+        if (cd_inquiry(&c) < 0)
+                goto work;
+
+        r = cd_profiles(&c); /* read drive and possibly current profile */
+        if (r > 0) {
+                /* at this point we are guaranteed to have media in the drive - find out more about it */
+
+                /* get session/track info */
+                (void) cd_media_toc(&c);
+
+                /* get writable media state */
+                (void) cd_media_info(&c);
+        }
+
+work:
+        /* lock the media, so we enable eject button events */
+        if (arg_lock && c.has_media) {
+                log_debug("PREVENT_ALLOW_MEDIUM_REMOVAL (lock)");
+                (void) media_lock(c.fd, true);
+        }
+
+        if (arg_unlock && c.has_media) {
+                log_debug("PREVENT_ALLOW_MEDIUM_REMOVAL (unlock)");
+                (void) media_lock(c.fd, false);
+        }
+
+        if (arg_eject) {
+                log_debug("PREVENT_ALLOW_MEDIUM_REMOVAL (unlock)");
+                (void) media_lock(c.fd, false);
+                log_debug("START_STOP_UNIT (eject)");
+                (void) media_eject(c.fd);
+        }
+
+        print_properties(&c);
+
+        return 0;
+}
+
+DEFINE_MAIN_FUNCTION(run);