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/*
* Copyright (C) 1999 by Andries Brouwer
* Copyright (C) 1999, 2000, 2003 by Theodore Ts'o
* Copyright (C) 2001 by Andreas Dilger
* Copyright (C) 2004 Kay Sievers <kay.sievers@vrfy.org>
* Copyright (C) 2008 Karel Zak <kzak@redhat.com>
*
* Inspired also by libvolume_id by
* Kay Sievers <kay.sievers@vrfy.org>
*
* This file may be redistributed under the terms of the
* GNU Lesser General Public License.
*/
#include <stdio.h>
#include <stdlib.h>
#include <unistd.h>
#include <string.h>
#include <stdint.h>
#include <ctype.h>
#include "superblocks.h"
#include "cctype.h"
struct iso9660_date {
unsigned char year[4];
unsigned char month[2];
unsigned char day[2];
unsigned char hour[2];
unsigned char minute[2];
unsigned char second[2];
unsigned char hundredth[2];
unsigned char offset;
} __attribute__ ((packed));
/* PVD - Primary volume descriptor */
struct iso_volume_descriptor {
unsigned char vd_type;
unsigned char vd_id[5];
unsigned char vd_version;
unsigned char flags;
unsigned char system_id[32];
unsigned char volume_id[32];
unsigned char unused[8];
unsigned char space_size[8];
unsigned char escape_sequences[8];
unsigned char unused2[94];
unsigned char volume_set_id[128];
unsigned char publisher_id[128];
unsigned char data_preparer_id[128];
unsigned char application_id[128];
unsigned char unused3[111];
struct iso9660_date created;
struct iso9660_date modified;
} __attribute__((packed));
/* Boot Record */
struct boot_record {
unsigned char vd_type;
unsigned char vd_id[5];
unsigned char vd_version;
unsigned char boot_system_id[32];
unsigned char boot_id[32];
unsigned char unused[1];
} __attribute__((packed));
#define ISO_SUPERBLOCK_OFFSET 0x8000
#define ISO_SECTOR_SIZE 0x800
#define ISO_VD_BOOT_RECORD 0x0
#define ISO_VD_PRIMARY 0x1
#define ISO_VD_SUPPLEMENTARY 0x2
#define ISO_VD_END 0xff
#define ISO_VD_MAX 16
struct high_sierra_volume_descriptor {
unsigned char foo[8];
unsigned char type;
unsigned char id[5];
unsigned char version;
unsigned char unused1;
unsigned char system_id[32];
unsigned char volume_id[32];
} __attribute__((packed));
/* old High Sierra format */
static int probe_iso9660_hsfs(blkid_probe pr, const struct blkid_idmag *mag)
{
struct high_sierra_volume_descriptor *iso;
iso = blkid_probe_get_sb(pr, mag, struct high_sierra_volume_descriptor);
if (!iso)
return errno ? -errno : 1;
blkid_probe_set_block_size(pr, ISO_SECTOR_SIZE);
blkid_probe_set_version(pr, "High Sierra");
blkid_probe_set_label(pr, iso->volume_id, sizeof(iso->volume_id));
return 0;
}
static int probe_iso9660_set_uuid (blkid_probe pr, const struct iso9660_date *date)
{
unsigned char buffer[16];
unsigned int i, zeros = 0;
buffer[0] = date->year[0];
buffer[1] = date->year[1];
buffer[2] = date->year[2];
buffer[3] = date->year[3];
buffer[4] = date->month[0];
buffer[5] = date->month[1];
buffer[6] = date->day[0];
buffer[7] = date->day[1];
buffer[8] = date->hour[0];
buffer[9] = date->hour[1];
buffer[10] = date->minute[0];
buffer[11] = date->minute[1];
buffer[12] = date->second[0];
buffer[13] = date->second[1];
buffer[14] = date->hundredth[0];
buffer[15] = date->hundredth[1];
/* count the number of zeros ('0') in the date buffer */
for (i = 0, zeros = 0; i < sizeof(buffer); i++)
if (buffer[i] == '0')
zeros++;
/* due to the iso9660 standard if all date fields are '0' and offset is 0, the date is unset */
if (zeros == sizeof(buffer) && date->offset == 0)
return 0;
/* generate an UUID using this date and return success */
blkid_probe_sprintf_uuid (pr, buffer, sizeof(buffer),
"%c%c%c%c-%c%c-%c%c-%c%c-%c%c-%c%c-%c%c",
buffer[0], buffer[1], buffer[2], buffer[3],
buffer[4], buffer[5],
buffer[6], buffer[7],
buffer[8], buffer[9],
buffer[10], buffer[11],
buffer[12], buffer[13],
buffer[14], buffer[15]);
return 1;
}
static int is_str_empty(const unsigned char *str, size_t len)
{
size_t i;
if (!str || !*str)
return 1;
for (i = 0; i < len; i++)
if (!isspace(str[i]))
return 0;
return 1;
}
static int is_utf16be_str_empty(unsigned char *utf16, size_t len)
{
size_t i;
for (i = 0; i < len; i += 2) {
if (utf16[i] != 0x0 || !isspace(utf16[i + 1]))
return 0;
}
return 1;
}
/* if @utf16 is prefix of @ascii (ignoring non-representable characters and upper-case conversion)
* then reconstruct prefix from @utf16 and @ascii, append suffix from @ascii, fill it into @out
* and returns length of bytes written into @out; otherwise returns zero */
static size_t merge_utf16be_ascii(unsigned char *out, const unsigned char *utf16, const unsigned char *ascii, size_t len)
{
size_t o, a, u;
for (o = 0, a = 0, u = 0; u + 1 < len && a < len; o += 2, a++, u += 2) {
/* Surrogate pair with code point above U+FFFF */
if (utf16[u] >= 0xD8 && utf16[u] <= 0xDB && u + 3 < len &&
utf16[u + 2] >= 0xDC && utf16[u + 2] <= 0xDF) {
out[o++] = utf16[u++];
out[o++] = utf16[u++];
}
/* Value '_' is replacement for non-representable character */
if (ascii[a] == '_') {
out[o] = utf16[u];
out[o + 1] = utf16[u + 1];
} else if (utf16[u] == 0x00 && utf16[u + 1] == '_') {
out[o] = 0x00;
out[o + 1] = ascii[a];
} else if (utf16[u] == 0x00 && c_toupper(ascii[a]) == c_toupper(utf16[u + 1])) {
out[o] = 0x00;
out[o + 1] = c_isupper(ascii[a]) ? utf16[u + 1] : ascii[a];
} else {
return 0;
}
}
for (; a < len; o += 2, a++) {
out[o] = 0x00;
out[o + 1] = ascii[a];
}
return o;
}
/* iso9660 [+ Microsoft Joliet Extension] */
static int probe_iso9660(blkid_probe pr, const struct blkid_idmag *mag)
{
struct boot_record *boot = NULL;
struct iso_volume_descriptor *pvd = NULL;
struct iso_volume_descriptor *joliet = NULL;
unsigned char buf[256];
size_t len;
int is_unicode_empty;
int is_ascii_empty;
int i;
uint64_t off;
if (blkid_probe_get_hint(pr, mag->hoff, &off) < 0)
off = 0;
if (off % ISO_SECTOR_SIZE)
return 1;
if (strcmp(mag->magic, "CDROM") == 0)
return probe_iso9660_hsfs(pr, mag);
for (i = 0, off += ISO_SUPERBLOCK_OFFSET; i < ISO_VD_MAX && (!boot || !pvd || !joliet); i++, off += ISO_SECTOR_SIZE) {
unsigned char *desc =
blkid_probe_get_buffer(pr,
off,
max(sizeof(struct boot_record),
sizeof(struct iso_volume_descriptor)));
if (desc == NULL || desc[0] == ISO_VD_END)
break;
else if (!boot && desc[0] == ISO_VD_BOOT_RECORD)
boot = (struct boot_record *)desc;
else if (!pvd && desc[0] == ISO_VD_PRIMARY)
pvd = (struct iso_volume_descriptor *)desc;
else if (!joliet && desc[0] == ISO_VD_SUPPLEMENTARY) {
joliet = (struct iso_volume_descriptor *)desc;
if (memcmp(joliet->escape_sequences, "%/@", 3) != 0 &&
memcmp(joliet->escape_sequences, "%/C", 3) != 0 &&
memcmp(joliet->escape_sequences, "%/E", 3) != 0)
joliet = NULL;
}
}
if (!pvd)
return errno ? -errno : 1;
blkid_probe_set_block_size(pr, ISO_SECTOR_SIZE);
if (joliet && (len = merge_utf16be_ascii(buf, joliet->system_id, pvd->system_id, sizeof(pvd->system_id))) != 0)
blkid_probe_set_utf8_id_label(pr, "SYSTEM_ID", buf, len, UL_ENCODE_UTF16BE);
else if (joliet)
blkid_probe_set_utf8_id_label(pr, "SYSTEM_ID", joliet->system_id, sizeof(joliet->system_id), UL_ENCODE_UTF16BE);
else
blkid_probe_set_id_label(pr, "SYSTEM_ID", pvd->system_id, sizeof(pvd->system_id));
if (joliet && (len = merge_utf16be_ascii(buf, joliet->volume_set_id, pvd->volume_set_id, sizeof(pvd->volume_set_id))) != 0)
blkid_probe_set_utf8_id_label(pr, "VOLUME_SET_ID", buf, len, UL_ENCODE_UTF16BE);
else if (joliet)
blkid_probe_set_utf8_id_label(pr, "VOLUME_SET_ID", joliet->volume_set_id, sizeof(joliet->volume_set_id), UL_ENCODE_UTF16BE);
else
blkid_probe_set_id_label(pr, "VOLUME_SET_ID", pvd->volume_set_id, sizeof(pvd->volume_set_id));
is_ascii_empty = (is_str_empty(pvd->publisher_id, sizeof(pvd->publisher_id)) || pvd->publisher_id[0] == '_');
is_unicode_empty = (!joliet || is_utf16be_str_empty(joliet->publisher_id, sizeof(joliet->publisher_id)) || (joliet->publisher_id[0] == 0x00 && joliet->publisher_id[1] == '_'));
if (!is_unicode_empty && !is_ascii_empty && (len = merge_utf16be_ascii(buf, joliet->publisher_id, pvd->publisher_id, sizeof(pvd->publisher_id))) != 0)
blkid_probe_set_utf8_id_label(pr, "PUBLISHER_ID", buf, len, UL_ENCODE_UTF16BE);
else if (!is_unicode_empty)
blkid_probe_set_utf8_id_label(pr, "PUBLISHER_ID", joliet->publisher_id, sizeof(joliet->publisher_id), UL_ENCODE_UTF16BE);
else if (!is_ascii_empty)
blkid_probe_set_id_label(pr, "PUBLISHER_ID", pvd->publisher_id, sizeof(pvd->publisher_id));
is_ascii_empty = (is_str_empty(pvd->data_preparer_id, sizeof(pvd->data_preparer_id)) || pvd->data_preparer_id[0] == '_');
is_unicode_empty = (!joliet || is_utf16be_str_empty(joliet->data_preparer_id, sizeof(joliet->data_preparer_id)) || (joliet->data_preparer_id[0] == 0x00 && joliet->data_preparer_id[1] == '_'));
if (!is_unicode_empty && !is_ascii_empty && (len = merge_utf16be_ascii(buf, joliet->data_preparer_id, pvd->data_preparer_id, sizeof(pvd->data_preparer_id))) != 0)
blkid_probe_set_utf8_id_label(pr, "DATA_PREPARER_ID", buf, len, UL_ENCODE_UTF16BE);
else if (!is_unicode_empty)
blkid_probe_set_utf8_id_label(pr, "DATA_PREPARER_ID", joliet->data_preparer_id, sizeof(joliet->data_preparer_id), UL_ENCODE_UTF16BE);
else if (!is_ascii_empty)
blkid_probe_set_id_label(pr, "DATA_PREPARER_ID", pvd->data_preparer_id, sizeof(pvd->data_preparer_id));
is_ascii_empty = (is_str_empty(pvd->application_id, sizeof(pvd->application_id)) || pvd->application_id[0] == '_');
is_unicode_empty = (!joliet || is_utf16be_str_empty(joliet->application_id, sizeof(joliet->application_id)) || (joliet->application_id[0] == 0x00 && joliet->application_id[1] == '_'));
if (!is_unicode_empty && !is_ascii_empty && (len = merge_utf16be_ascii(buf, joliet->application_id, pvd->application_id, sizeof(pvd->application_id))) != 0)
blkid_probe_set_utf8_id_label(pr, "APPLICATION_ID", buf, len, UL_ENCODE_UTF16BE);
else if (!is_unicode_empty)
blkid_probe_set_utf8_id_label(pr, "APPLICATION_ID", joliet->application_id, sizeof(joliet->application_id), UL_ENCODE_UTF16BE);
else if (!is_ascii_empty)
blkid_probe_set_id_label(pr, "APPLICATION_ID", pvd->application_id, sizeof(pvd->application_id));
/* create an UUID using the modified/created date */
if (! probe_iso9660_set_uuid(pr, &pvd->modified))
probe_iso9660_set_uuid(pr, &pvd->created);
if (boot)
blkid_probe_set_id_label(pr, "BOOT_SYSTEM_ID",
boot->boot_system_id,
sizeof(boot->boot_system_id));
if (joliet)
blkid_probe_set_version(pr, "Joliet Extension");
/* Label in Joliet is UNICODE (UTF16BE) but can contain only 16 characters. Label in PVD is
* subset of ASCII but can contain up to the 32 characters. Non-representable characters are
* stored as replacement character '_'. Label in Joliet is in most cases trimmed but UNICODE
* version of label in PVD. Based on these facts try to reconstruct original label if label
* in Joliet is prefix of the label in PVD (ignoring non-representable characters).
*/
if (joliet && (len = merge_utf16be_ascii(buf, joliet->volume_id, pvd->volume_id, sizeof(pvd->volume_id))) != 0)
blkid_probe_set_utf8label(pr, buf, len, UL_ENCODE_UTF16BE);
else if (joliet)
blkid_probe_set_utf8label(pr, joliet->volume_id, sizeof(joliet->volume_id), UL_ENCODE_UTF16BE);
else
blkid_probe_set_label(pr, pvd->volume_id, sizeof(pvd->volume_id));
return 0;
}
const struct blkid_idinfo iso9660_idinfo =
{
.name = "iso9660",
.usage = BLKID_USAGE_FILESYSTEM,
.probefunc = probe_iso9660,
.flags = BLKID_IDINFO_TOLERANT,
.magics =
{
{ .magic = "CD001", .len = 5, .kboff = 32, .sboff = 1, .hoff = "session_offset" },
{ .magic = "CDROM", .len = 5, .kboff = 32, .sboff = 9, .hoff = "session_offset" },
{ NULL }
}
};
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