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libisoburn/libisoburn/isofs_wrap.c

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/*
cc -g -c isofs_wrap.c
*/
/*
libisofs related functions of libisoburn.
Copyright 2007 - 2009 Vreixo Formoso Lopes <metalpain2002@yahoo.es>
Copyright 2007 - 2020 Thomas Schmitt <scdbackup@gmx.net>
Provided under GPL version 2 or later.
*/
#ifdef HAVE_CONFIG_H
#include "../config.h"
#endif
#include <stdlib.h>
#include <string.h>
#include <stdio.h>
#ifndef Xorriso_standalonE
#include <libburn/libburn.h>
#include <libisofs/libisofs.h>
#else /* ! Xorriso_standalonE */
#include "../libisofs/libisofs.h"
#include "../libburn/libburn.h"
#endif /* Xorriso_standalonE */
#include "libisoburn.h"
#include "isoburn.h"
#define BP(a,b) [(b) - (a) + 1]
struct ecma119_pri_vol_desc
{
uint8_t vol_desc_type BP(1, 1);
uint8_t std_identifier BP(2, 6);
uint8_t vol_desc_version BP(7, 7);
uint8_t unused1 BP(8, 8);
uint8_t system_id BP(9, 40);
uint8_t volume_id BP(41, 72);
uint8_t unused2 BP(73, 80);
uint8_t vol_space_size BP(81, 88);
uint8_t unused3 BP(89, 120);
uint8_t vol_set_size BP(121, 124);
uint8_t vol_seq_number BP(125, 128);
uint8_t block_size BP(129, 132);
uint8_t path_table_size BP(133, 140);
uint8_t l_path_table_pos BP(141, 144);
uint8_t opt_l_path_table_pos BP(145, 148);
uint8_t m_path_table_pos BP(149, 152);
uint8_t opt_m_path_table_pos BP(153, 156);
uint8_t root_dir_record BP(157, 190);
uint8_t vol_set_id BP(191, 318);
uint8_t publisher_id BP(319, 446);
uint8_t data_prep_id BP(447, 574);
uint8_t application_id BP(575, 702);
uint8_t copyright_file_id BP(703, 739);
uint8_t abstract_file_id BP(740, 776);
uint8_t bibliographic_file_id BP(777, 813);
uint8_t vol_creation_time BP(814, 830);
uint8_t vol_modification_time BP(831, 847);
uint8_t vol_expiration_time BP(848, 864);
uint8_t vol_effective_time BP(865, 881);
uint8_t file_structure_version BP(882, 882);
uint8_t reserved1 BP(883, 883);
uint8_t app_use BP(884, 1395);
uint8_t reserved2 BP(1396, 2048);
};
static
uint32_t iso_read_lsb(const uint8_t *buf, int bytes)
{
int i;
uint32_t ret = 0;
for (i=0; i<bytes; i++) {
ret += ((uint32_t) buf[i]) << (i*8);
}
return ret;
}
/* API function. See libisoburn.h
*/
IsoImage *isoburn_get_attached_image(struct burn_drive *d)
{
int ret;
struct isoburn *o= NULL;
ret = isoburn_find_emulator(&o, d, 0);
if (ret < 0)
return NULL;
if (o == NULL) {
return NULL;
}
iso_image_ref(o->image);
return o->image;
}
/* API */
int isoburn_get_attached_start_lba(struct burn_drive *d)
{
int ret;
struct isoburn *o= NULL;
ret = isoburn_find_emulator(&o, d, 0);
if (ret < 0 || o == NULL)
return -1;
if(o->image == NULL)
return -1;
return o->image_start_lba;
}
static void isoburn_idle_free_function(void *ignored)
{
return;
}
int isoburn_root_defaults(IsoImage *image, int flag)
{
IsoNode *root_node;
mode_t root_mode= 0755;
root_node= (IsoNode *) iso_image_get_root(image);
iso_node_set_permissions(root_node, root_mode);
return(1);
}
/* API function. See libisoburn.h
*/
int isoburn_read_image(struct burn_drive *d,
struct isoburn_read_opts *read_opts,
IsoImage **image)
{
int ret, int_num, dummy, ignore_aclea= 0;
IsoReadOpts *ropts= NULL;
IsoReadImageFeatures *features= NULL;
uint32_t ms_block;
char *msg= NULL;
enum burn_disc_status status= BURN_DISC_BLANK;
IsoDataSource *ds= NULL;
struct isoburn *o= NULL;
IsoImage *new_image= NULL;
msg= calloc(1, 160);
if(d != NULL) {
ret = isoburn_find_emulator(&o, d, 0);
if (ret < 0 || o == NULL)
{ret= 0; goto ex;}
status = isoburn_disc_get_status(d);
o->image_start_lba= -1;
}
if(read_opts==NULL) {
isoburn_msgs_submit(o, 0x00060000,
"Program error: isoburn_read_image: read_opts==NULL",
0, "FATAL", 0);
{ret= -1; goto ex;}
}
if (d == NULL || status == BURN_DISC_BLANK || read_opts->pretend_blank) {
create_blank_image:;
/*
* Blank disc, we create a new image without files.
*/
if (d == NULL) {
/* New empty image without relation to a drive */
if (image==NULL) {
isoburn_msgs_submit(o, 0x00060000,
"Program error: isoburn_read_image: image==NULL",
0, "FATAL", 0);
{ret= -1; goto ex;}
}
/* create a new image */
ret = iso_image_new("ISOIMAGE", image);
if (ret < 0) {
isoburn_report_iso_error(ret, "Cannot create image", 0, "FATAL", 0);
goto ex;
}
new_image= *image;
} else {
/* Blank new image for the drive */
if(o->image != NULL)
ignore_aclea= iso_image_get_ignore_aclea(o->image);
iso_image_unref(o->image);
ret = iso_image_new("ISOIMAGE", &o->image);
if (ret < 0) {
isoburn_report_iso_error(ret, "Cannot create image", 0, "FATAL", 0);
goto ex;
}
if (image != NULL) {
*image = o->image;
iso_image_ref(*image); /*protects object from premature free*/
}
iso_image_set_ignore_aclea(o->image, ignore_aclea);
ret= isoburn_root_defaults(o->image, 0);
if(ret <= 0)
goto ex;
new_image= o->image;
}
ret= iso_image_set_truncate_mode(new_image, read_opts->truncate_mode,
read_opts->truncate_length);
if(ret < 0)
goto ex;
{ret= 1; goto ex;}
}
if (status != BURN_DISC_APPENDABLE && status != BURN_DISC_FULL) {
isoburn_msgs_submit(o, 0x00060000,
"Program error: isoburn_read_image: incorrect disc status",
0, "FATAL", 0);
{ret= -4; goto ex;}
}
ret = isoburn_disc_get_msc1(d, &int_num);
if (ret <= 0)
{ret= -2; goto ex;}
ms_block= int_num;
if (o != NULL)
o->image_start_lba= ms_block;
ret = isoburn_read_iso_head(d, int_num, &dummy, NULL, 0);
if (ret <= 0) {
sprintf(msg, "No ISO 9660 image at LBA %d. Creating blank image.", int_num);
isoburn_msgs_submit(o, 0x00060000, msg, 0, "WARNING", 0);
goto create_blank_image;
}
if(read_opts->displacement != 0 && abs(read_opts->displacement_sign) == 1) {
/* Apply reverse displacement to session start */
if(read_opts->displacement_sign == -1) {
if(ms_block+ read_opts->displacement < ms_block) {
displacement_rollover:;
sprintf(msg, "Displacement offset leads outside 32 bit range.");
isoburn_msgs_submit(o, 0x00060000, msg, 0, "FAILURE", 0);
{ret= 0; goto ex;}
}
ms_block+= read_opts->displacement;
} else {
if(ms_block < read_opts->displacement)
goto displacement_rollover;
ms_block-= read_opts->displacement;
}
}
/* create the data source */
ret = iso_read_opts_new(&ropts, 0);
if (ret < 0) {
isoburn_report_iso_error(ret, "Cannot create write opts", 0, "FATAL", 0);
goto ex;
}
/* Important: do not return until iso_read_opts_free() */
iso_read_opts_set_start_block(ropts, ms_block);
iso_read_opts_set_no_rockridge(ropts, read_opts->norock);
iso_read_opts_set_no_aaip(ropts, read_opts->noaaip);
if(read_opts->nomd5 == 2)
int_num= 2;
else if(read_opts->nomd5 == 1)
int_num= 1;
else
int_num= 0;
iso_read_opts_set_no_md5(ropts, int_num);
if(read_opts->do_ecma119_map)
iso_read_opts_set_ecma119_map(ropts, read_opts->map_mode);
if(read_opts->do_joliet_map)
iso_read_opts_set_joliet_map(ropts, read_opts->joliet_map_mode);
iso_read_opts_set_new_inos(ropts, read_opts->noino);
iso_read_opts_set_no_joliet(ropts, read_opts->nojoliet);
iso_read_opts_set_no_iso1999(ropts, read_opts->noiso1999);
iso_read_opts_set_preferjoliet(ropts, read_opts->preferjoliet);
iso_read_opts_set_default_permissions(ropts,
read_opts->mode, read_opts->dirmode);
iso_read_opts_set_default_uid(ropts, read_opts->uid);
iso_read_opts_set_default_gid(ropts, read_opts->gid);
iso_read_opts_set_input_charset(ropts, read_opts->input_charset);
iso_read_opts_auto_input_charset(ropts, read_opts->auto_input_charset);
iso_read_opts_load_system_area(ropts, 1);
iso_read_opts_keep_import_src(ropts, 1);
ret= iso_image_set_truncate_mode(o->image, read_opts->truncate_mode,
read_opts->truncate_length);
if(ret < 0)
goto ex;
ds = isoburn_data_source_new(d, read_opts->displacement,
read_opts->displacement_sign,
read_opts->cache_tiles, read_opts->cache_tile_blocks);
if (ds == NULL) {
isoburn_report_iso_error(ret, "Cannot create IsoDataSource object", 0,
"FATAL", 0);
ret= -1; goto ex;
}
if(o->iso_data_source!=NULL)
iso_data_source_unref(o->iso_data_source);
o->iso_data_source= ds;
iso_image_attach_data(o->image, o->read_pacifier_handle,
isoburn_idle_free_function);
if(o->read_pacifier_handle==NULL)
iso_tree_set_report_callback(o->image, NULL);
else
iso_tree_set_report_callback(o->image, o->read_pacifier);
ret = iso_image_import(o->image, ds, ropts, &features);
iso_tree_set_report_callback(o->image, NULL);
iso_read_opts_free(ropts);
ropts= NULL;
if (ret < 0) {
isoburn_report_iso_error(ret, "Cannot import image", 0, "FAILURE", 0);
goto ex;
}
/* Important: do not return until free(features) */
if (image!=NULL) {
*image = o->image;
iso_image_ref(*image); /*protects object from premature free*/
}
read_opts->hasRR = iso_read_image_features_has_rockridge(features);
read_opts->hasJoliet = iso_read_image_features_has_joliet(features);
read_opts->hasIso1999 = iso_read_image_features_has_iso1999(features);
read_opts->hasElTorito = iso_read_image_features_has_eltorito(features);
read_opts->size = iso_read_image_features_get_size(features);
read_opts->tree_loaded = iso_read_image_features_tree_loaded(features);
read_opts->rr_loaded = iso_read_image_features_rr_loaded(features);
ret= 1;
ex:;
if(msg != NULL)
free(msg);
if(ropts != NULL)
iso_read_opts_free(ropts);
if(features != NULL)
iso_read_image_features_destroy(features);
return(ret);
}
/* API function. See libisoburn.h
*/
int isoburn_attach_image(struct burn_drive *d, IsoImage *image)
{
int ret;
struct isoburn *o;
ret = isoburn_find_emulator(&o, d, 0);
if (ret < 0 || o == NULL)
return 0;
if (image == NULL) {
isoburn_msgs_submit(o, 0x00060000,
"Program error: isoburn_attach_image: image==NULL",
0, "FATAL", 0);
return -1;
}
if(o->image != NULL)
iso_image_unref(o->image);
o->image = image;
o->image_start_lba = -1;
return(1);
}
/* API */
int isoburn_attach_start_lba(struct burn_drive *d, int lba, int flag)
{
int ret;
struct isoburn *o;
ret = isoburn_find_emulator(&o, d, 0);
if(ret < 0)
return ret;
if(o == NULL)
return 0;
if(o->image == NULL)
return 0;
o->image_start_lba = lba;
return 1;
}
/* API function. See libisoburn.h
*/
int isoburn_activate_session(struct burn_drive *drive)
{
int ret, do_sync = 1;
struct isoburn *o;
ret = isoburn_find_emulator(&o, drive, 0);
if (ret < 0)
return -1;
if (o->emulation_mode != 1)
return 1; /* don't need to activate session */
if (o->fabricated_msc2 >= 0)
return 1; /* blind growing: do not alter anything outside the session */
if (!(o->fabricated_disc_status == BURN_DISC_APPENDABLE ||
(o->fabricated_disc_status == BURN_DISC_BLANK &&
o->zero_nwa > 0)))
return 1;
ret = burn_drive_get_drive_role(drive);
if (ret != 1)
do_sync = !! o->do_fsync;
ret = burn_random_access_write(drive, (off_t) 0, (char*)o->target_iso_head,
o->target_iso_head_size, do_sync);
return ret;
}
/** API @since 0.6.2
*/
int isoburn_get_img_partition_offset(struct burn_drive *drive,
uint32_t *block_offset_2k)
{
int ret;
struct isoburn *o;
ret = isoburn_find_emulator(&o, drive, 0);
if(ret < 0 || o == NULL)
return -1;
*block_offset_2k= o->loaded_partition_offset;
if(o->loaded_partition_offset == 0)
return(0);
if(o->target_iso_head_size == (off_t) Libisoburn_target_head_sizE
+ (off_t) 2048 * (off_t) o->loaded_partition_offset)
return(1);
return(2);
}
/* Check for MBR signature and a first partition that starts at a 2k block
and ends where the image ends.
If not too large or too small, accept its start as partition offset.
*/
static int isoburn_inspect_partition(struct isoburn *o, uint32_t img_size,
int flag)
{
uint8_t *mbr, *part, *buf= NULL;
uint32_t offst, numsec;
struct ecma119_pri_vol_desc *pvm;
off_t data_count;
int ret;
char *msg= NULL;
static int max_offst= 512 - 32;
buf= (uint8_t *) calloc(1, 2048);
msg= calloc(1, 160);
if(buf == NULL || msg == NULL)
{ret= -1; goto ex;}
mbr= o->target_iso_head;
part= mbr + 446;
if(mbr[510] != 0x55 || mbr[511] != 0xAA)
{ret= 2; goto ex;} /* not an MBR */
/* Does the first partition entry look credible ? */
if(part[0] != 0x80 && part[0] != 0x00)
{ret= 2; goto ex;} /* Invalid partition status */
if(part[1] == 0 && part[2] == 0 && part[3] == 0)
{ret= 2; goto ex;} /* Zero C/H/S start address */
/* Does it match the normal ISO image ? */
offst= iso_read_lsb(part + 8, 4);
numsec= iso_read_lsb(part + 12, 4);
if(offst < 64)
{ret= 2; goto ex;} /* Zero or unusably small partition start */
if((offst % 4) || (numsec % 4))
{ret= 2; goto ex;} /* Not aligned to 2k */
if(numsec < 72)
{ret= 2; goto ex;} /* No room for volume descriptors */
offst/= 4;
numsec/= 4;
if(offst + numsec > img_size)
{ret= 2; goto ex;} /* Partition end exceeds image end */
/* Is there a PVD at the partition start ? */
ret = burn_read_data(o->drive, (off_t) (offst + 16) * (off_t) 2048,
(char*) buf, 2048, &data_count, 32);
if(ret <= 0)
{ret= 2; goto ex;}
pvm = (struct ecma119_pri_vol_desc *) buf;
if (strncmp((char*) pvm->std_identifier, "CD001", 5) != 0)
{ret= 2; goto ex;} /* not a PVD */
if (pvm->vol_desc_type[0] != 1 || pvm->vol_desc_version[0] != 1
|| pvm->file_structure_version[0] != 1 )
{ret= 2; goto ex;} /* failed sanity check */
if(iso_read_lsb(pvm->vol_space_size, 4) + offst > img_size)
{ret= 2; goto ex;} /* Image ends do not match plausibly */
/* Now it is credible. Not yet clear is whether it is acceptable. */
o->loaded_partition_offset= offst;
/* If the partition start is too large: Report but do not accept. */
if(offst > (uint32_t) max_offst) {/* Not more than 1 MB of .target_iso_head */
sprintf(msg,
"Detected partition offset of %.f blocks. Maximum for load buffer is %d",
(double) offst, max_offst);
isoburn_msgs_submit(NULL, 0x00060000, msg, 0, "WARNING", 0);
{ret= 3; goto ex;}
}
/* Accept partition start and adjust buffer size */
ret= isoburn_adjust_target_iso_head(o, offst, 0);
if(ret <= 0)
goto ex;
ret= 1;
ex:;
if(buf != NULL)
free(buf);
if(msg != NULL)
free(msg);
return(ret);
}
/** Initialize the emulation of multi-session on random access media.
The need for emulation is confirmed already.
@param o A freshly created isoburn object. isoburn_create_data_source() was
already called, nevertheless.
@param flag bit0= read-only
@return <=0 error , 1 = success
*/
int isoburn_start_emulation(struct isoburn *o, int flag)
{
int ret, i, capacity = -1, role, dummy;
off_t data_count, to_read;
struct burn_drive *drive;
struct ecma119_pri_vol_desc *pvm;
enum burn_disc_status s;
char *path= NULL, *msg= NULL;
path= calloc(1, BURN_DRIVE_ADR_LEN);
msg= calloc(1, 2 * BURN_DRIVE_ADR_LEN);
if(path == NULL || msg == NULL)
{ret= -1; goto ex;}
if(o==NULL) {
isoburn_msgs_submit(NULL, 0x00060000,
"Program error: isoburn_start_emulation: o==NULL",
0, "FATAL", 0);
{ret= -1; goto ex;}
}
drive= o->drive;
if(flag & 1)
o->fabricated_disc_status= BURN_DISC_FULL;
/* We can assume 0 as start block for image.
The data there point to the most recent session.
*/
role = burn_drive_get_drive_role(drive);
ret = burn_get_read_capacity(drive, &capacity, 0);
if (ret <= 0)
capacity = -1;
if (role == 5) { /* random access write-only medium */
s = burn_disc_get_status(drive);
o->fabricated_disc_status= s;
burn_disc_track_lba_nwa(drive, NULL, 0, &dummy, &(o->nwa));
if(o->nwa < o->zero_nwa)
o->zero_nwa= 0;
{ret= 1; goto ex;}
} else if (capacity > 0 || role == 2 || role == 4) {
/* Might be a block device on a system where libburn cannot determine its
size. Try to read anyway. */
to_read = o->target_iso_head_size;
memset(o->target_iso_head, 0, to_read);
if(capacity > 0 && (off_t) capacity * (off_t) 2048 < to_read)
to_read = (off_t) capacity * (off_t) 2048;
ret = burn_read_data(drive, (off_t) 0, (char*)o->target_iso_head,
to_read, &data_count, 32 | 8);
if (ret <= 0) {
/* an error means a disc with no ISO image */
o->media_read_error= 1;
if (ret == -2) {
path[0]= 0;
burn_drive_d_get_adr(drive, path);
sprintf(msg, "Pseudo drive '%s' does not allow reading", path);
isoburn_msgs_submit(NULL, 0x00060000, msg, 0, "NOTE", 0);
o->fabricated_disc_status= BURN_DISC_BLANK;
} else if (capacity > 0)
o->fabricated_disc_status= BURN_DISC_FULL;
else if(!(flag & 1))
o->fabricated_disc_status= BURN_DISC_BLANK;
{ret= 1; goto ex;}
}
} else {
/* No read capacity means blank medium */
if(!(flag & 1))
o->fabricated_disc_status= BURN_DISC_BLANK;
{ret= 1; goto ex;}
}
/* check first 64K. If 0's, the disc is treated as a blank disc, and thus
overwritten without extra check. */
i = Libisoburn_target_head_sizE;
while (i && !o->target_iso_head[i-1])
--i;
if (!i) {
if(!(flag & 1))
o->fabricated_disc_status= BURN_DISC_BLANK;
{ret= 1; goto ex;}
}
pvm = (struct ecma119_pri_vol_desc *)(o->target_iso_head + 16 * 2048);
if (strncmp((char*)pvm->std_identifier, "CD001", 5) == 0) {
off_t size;
/* sanity check */
if (pvm->vol_desc_type[0] != 1 || pvm->vol_desc_version[0] != 1
|| pvm->file_structure_version[0] != 1 ) {
/* TODO for now I treat this as a full disc */
o->fabricated_disc_status= BURN_DISC_FULL;
{ret= 1; goto ex;}
}
/* ok, PVM found, set size */
size = (off_t) iso_read_lsb(pvm->vol_space_size, 4);
ret= isoburn_inspect_partition(o, (uint32_t) size, 0);
if (ret <= 0)
goto ex;
size *= (off_t) 2048; /* block size in bytes */
isoburn_set_start_byte(o, size, 0);
if(!(flag & 1))
o->fabricated_disc_status= BURN_DISC_APPENDABLE;
} else if (strncmp((char*)pvm->std_identifier, "CDXX1", 5) == 0 ||
(strncmp((char*)pvm->std_identifier, "CDxx1", 5) == 0 &&
pvm->vol_desc_type[0] == 'x')) {
/* empty image */
isoburn_set_start_byte(o, o->zero_nwa * 2048, 0);
if(!(flag & 1))
o->fabricated_disc_status= BURN_DISC_BLANK;
} else {
/* treat any disc in an unknown format as full */
o->fabricated_disc_status= BURN_DISC_FULL;
}
ret= 1;
ex:;
if(path != NULL)
free(path);
if(msg != NULL)
free(msg);
return(ret);
}
/** Alters and writes the first 64 kB of a "medium" to invalidate
an ISO image. (It shall stay restorable by skilled humans, though).
The result shall especially keep libisoburn from accepting the medium
image as ISO filesystem.
@param o A fully activated isoburn object. isoburn_start_emulation()
was already called.
@return <=0 error , 1 = success
*/
int isoburn_invalidate_iso(struct isoburn *o, int flag)
{
int end_ed_found= 0, i;
char *head;
head= (char *) o->target_iso_head;
/*
* replace CD001 with CDXX1 in PVM.
*/
memcpy(head + 16 * 2048 + 1, "CDXX1", 5);
/* Invalidate further ECMA-119 volume descriptors and possible UDF volume
recognition sequence */
for(i= 17 * 2048; i < 32 * 2048; i+= 2048) {
if(end_ed_found) {
if(head[i] == 0 && strncmp(head + i + 1, "BEA01", 5) == 0)
memcpy(head + i + 1, "BEAX1", 5);
else if(head[i] == 0 && strncmp(head + i + 1, "NSR", 3) == 0)
memcpy(head + i + 1, "NSRX", 4);
else if(head[i] == 0 && strncmp(head + i + 1, "TEA", 3) == 0)
memcpy(head + i + 1, "TEAX", 4);
} else if(strncmp(head + i + 1, "CD001", 5) == 0) {
if(((unsigned char *) head)[i] == 0xff)
end_ed_found= 1;
memcpy(head + i + 3, "XX", 2);
}
}
return isoburn_activate_session(o->drive);
}
/* API @since 0.1.0 */
int isoburn_set_read_pacifier(struct burn_drive *drive,
int (*read_pacifier)(IsoImage*, IsoFileSource*),
void *read_handle)
{
int ret;
struct isoburn *o;
ret = isoburn_find_emulator(&o, drive, 0);
if(ret < 0 || o == NULL)
return -1;
o->read_pacifier_handle= read_handle;
o->read_pacifier= read_pacifier;
return(1);
}
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