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New API call iso_write_opts_set_scdbackup_tag()

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This commit is contained in:
Thomas Schmitt
2009-08-31 23:09:16 +02:00
parent 9cfa55345e
commit c992687200
6 changed files with 193 additions and 40 deletions
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36
libisofs/ecma119.c
View File

@ -31,11 +31,13 @@
#include "md5.h"
#endif
#include <ctype.h>
#include <stdlib.h>
#include <time.h>
#include <string.h>
#include <locale.h>
#include <langinfo.h>
#include <stdio.h>
/*
* TODO #00011 : guard against bad path table usage with more than 65535 dirs
@ -1132,6 +1134,7 @@ int ecma119_image_new(IsoImage *src, IsoWriteOpts *opts, Ecma119Image **img)
target->md5_file_checksums = opts->md5_file_checksums;
target->md5_session_checksum = opts->md5_session_checksum;
strcpy(target->scdbackup_tag_parm, opts->scdbackup_tag_parm);
target->checksum_idx_counter = 0;
target->checksum_ctx = NULL;
target->checksum_counter = 0;
@ -1866,6 +1869,39 @@ int iso_write_opts_set_record_md5(IsoWriteOpts *opts, int session, int files)
return ISO_SUCCESS;
}
int iso_write_opts_set_scdbackup_tag(IsoWriteOpts *opts,
char *name, char *timestamp)
{
#ifdef Libisofs_with_checksumS
char eff_name[81], eff_time[19];
int i;
for (i = 0; name[i] != 0 && i < 80; i++)
if (isspace((int) ((unsigned char *) name)[i]))
eff_name[i] = '_';
else
eff_name[i] = name[i];
if (i == 0)
eff_name[i++] = '_';
eff_name[i] = 0;
for (i = 0; timestamp[i] != 0 && i < 18; i++)
if (isspace((int) ((unsigned char *) timestamp)[i]))
eff_time[i] = '_';
else
eff_time[i] = timestamp[i];
if (i == 0)
eff_time[i++] = '_';
eff_time[i] = 0;
sprintf(opts->scdbackup_tag_parm, "%s %s", eff_name, eff_time);
#endif /* Libisofs_with_checksumS */
return ISO_SUCCESS;
}
int iso_write_opts_set_replace_mode(IsoWriteOpts *opts, int dir_mode,
int file_mode, int uid, int gid)
{

11
libisofs/ecma119.h
View File

@ -281,6 +281,15 @@ struct iso_write_opts {
*/
uint32_t data_start_lba;
/**
* If not empty: A text holding parameters "name" and "timestamp" for
* a scdbackup stream checksum tag. See scdbackup/README appendix VERIFY.
* It makes sense only for single session images which start at LBA 0.
* Such a tag may be part of a libisofs checksum tag block after the
* session tag line. It then covers the whole session up to its own start
* position.
*/
char scdbackup_tag_parm[100];
};
typedef struct ecma119_image Ecma119Image;
@ -464,6 +473,8 @@ struct ecma119_image
is submitted with ecma119_image_new() ?
*/
char scdbackup_tag_parm[96];
#endif /* Libisofs_with_checksumS */
/* Buffer for communication between burn_source and writer thread */

28
libisofs/libisofs.h
View File

@ -1446,6 +1446,27 @@ int iso_write_opts_set_sort_files(IsoWriteOpts *opts, int sort);
*/
int iso_write_opts_set_record_md5(IsoWriteOpts *opts, int session, int files);
/**
* Set the parameters "name" and "timestamp" for a scdbackup checksum tag.
* It will be appended to the libisofs session tag if the image starts at
* LBA 0 (see iso_write_opts_set_ms_block()). The scdbackup tag can be used
* to verify the image by command scdbackup_verify <device> -auto_end.
* See scdbackup/README appendix VERIFY for its inner details.
*
* @param name
* A word of up to 80 characters. Typically <volno>_<totalno> telling
* that this is volume <volno> of a total of <totalno> volumes.
* @param timestamp
* A string of 13 characters YYMMDD.hhmmss (e.g. A90831.190324).
* A9 = 2009, B0 = 2010, B1 = 2011, ... C0 = 2020, ...
* @return
* 1 indicates success, <0 is error
*
* @since 0.6.24
*/
int iso_write_opts_set_scdbackup_tag(IsoWriteOpts *opts,
char *name, char *timestamp);
/**
* Whether to set default values for files and directory permissions, gid and
* uid. All these take one of three values: 0, 1 or 2.
@ -5522,6 +5543,13 @@ int iso_md5_match(char first_md5[16], char second_md5[16]);
*/
#define ISO_MD5_STREAM_CHANGE 0xE430FE9A
/**
* Session does not start at LBA 0. scdbackup checksum tag not written.
* (WARNING, HIGH, -359)
* @since 0.6.24
*/
#define ISO_SCDBACKUP_TAG_NOT_0 0xD030FE99
/* ! PLACE NEW ERROR CODES HERE ! */

143
libisofs/md5.c
View File

@ -698,6 +698,66 @@ int checksum_writer_create(Ecma119Image *target)
}
static
int iso_md5_write_scdbackup_tag(Ecma119Image *t, char *tag_block, int flag)
{
#ifdef Libisofs_with_checksumS
void *ctx = NULL;
off_t pos = 0, line_start;
int record_len, block_len, res, i;
char postext[20], md5[16], record[160];
line_start = strlen(tag_block);
iso_md5_compute(t->checksum_ctx, tag_block, line_start);
res = iso_md5_clone(t->checksum_ctx, &ctx);
if (res < 0)
goto ex;
res = iso_md5_end(&ctx, md5);
pos = (off_t) t->checksum_tag_pos * (off_t) 2048 + line_start;
if(pos >= 1000000000)
sprintf(postext, "%u%9.9u", (unsigned int) (pos / 1000000000),
(unsigned int) (pos % 1000000000));
else
sprintf(postext, "%u", (unsigned int) pos),
sprintf(record, "%s %s ", t->scdbackup_tag_parm, postext);
record_len = strlen(record);
for (i = 0; i < 16; i++)
sprintf(record + record_len + 2 * i,
"%2.2x", ((unsigned char *) md5)[i]);
record_len+= 32;
res = iso_md5_start(&ctx);
if (res < 0)
goto ex;
iso_md5_compute(ctx, record, record_len);
iso_md5_end(&ctx, md5);
sprintf(tag_block + line_start, "scdbackup_checksum_tag_v0.1 %s %d %s ",
postext, record_len, record);
block_len = strlen(tag_block);
for (i = 0; i < 16; i++)
sprintf(tag_block + block_len + 2 * i,
"%2.2x", ((unsigned char *) md5)[i]);
block_len+= 32;
tag_block[block_len++]= '\n';
res = ISO_SUCCESS;
ex:;
if (ctx != NULL)
iso_md5_end(&ctx, md5);
return res;
#else
return ISO_SUCCESS;
#endif /* Libisofs_with_checksumS */
}
/* Write stream detectable checksum tag to extra block.
* @flag bit0-7= tag type
* 1= session tag (End checksumming.)
@ -719,11 +779,16 @@ int iso_md5_write_tag(Ecma119Image *t, int flag)
start = t->checksum_range_start;
memset(tag_block, 0, 2048);
mode = flag & 255;
if (mode < 1 || mode > 4)
return ISO_WRONG_ARG_VALUE;
res = iso_md5_clone(t->checksum_ctx, &ctx);
if (res < 0)
return res;
res = iso_md5_end(&ctx, md5);
if (mode == 1) {
res = iso_md5_end(&(t->checksum_ctx), md5);
size = t->checksum_range_size;
pos = t->checksum_tag_pos;
} else if (mode >= 2 && mode <= 4) {
} else {
if (mode == 2) {
pos = t->checksum_sb_tag_pos;
} else if (mode == 3) {
@ -733,46 +798,51 @@ int iso_md5_write_tag(Ecma119Image *t, int flag)
start = pos - (pos % 32);
}
size = pos - start;
res = iso_md5_clone(t->checksum_ctx, &ctx);
if (res < 0)
return res;
res = iso_md5_end(&ctx, md5);
} else {
return ISO_WRONG_ARG_VALUE;
}
if (res > 0) {
iso_util_tag_magic(mode, &tag_id, &tag_id_len, 0);
sprintf(tag_block,
"%s pos=%u range_start=%u range_size=%u",
tag_id, pos, start, size);
if (res < 0)
goto ex;
l = strlen(tag_block);
if (mode == 2) {
sprintf(tag_block + l, " next=%u", t->checksum_tree_tag_pos);
} else if (mode == 3) {
sprintf(tag_block + l, " next=%u", t->checksum_tag_pos);
} else if (mode == 4) {
sprintf(tag_block + l, " session_start=%u", t->ms_block);
}
strcat(tag_block + l, " md5=");
l = strlen(tag_block);
iso_util_tag_magic(mode, &tag_id, &tag_id_len, 0);
sprintf(tag_block, "%s pos=%u range_start=%u range_size=%u",
tag_id, pos, start, size);
l = strlen(tag_block);
if (mode == 2) {
sprintf(tag_block + l, " next=%u", t->checksum_tree_tag_pos);
} else if (mode == 3) {
sprintf(tag_block + l, " next=%u", t->checksum_tag_pos);
} else if (mode == 4) {
sprintf(tag_block + l, " session_start=%u", t->ms_block);
}
strcat(tag_block + l, " md5=");
l = strlen(tag_block);
for (i = 0; i < 16; i++)
sprintf(tag_block + l + 2 * i, "%2.2x",
((unsigned char *) md5)[i]);
l+= 32;
res = iso_md5_start(&ctx);
if (res > 0) {
iso_md5_compute(ctx, tag_block, l);
iso_md5_end(&ctx, md5);
strcpy(tag_block + l, " self=");
l += 6;
for (i = 0; i < 16; i++)
sprintf(tag_block + l + 2 * i, "%2.2x",
((unsigned char *) md5)[i]);
l+= 32;
res = iso_md5_start(&ctx);
if (res > 0) {
iso_md5_compute(ctx, tag_block, l);
iso_md5_end(&ctx, md5);
strcpy(tag_block + l, " self=");
l += 6;
for (i = 0; i < 16; i++)
sprintf(tag_block + l + 2 * i, "%2.2x",
((unsigned char *) md5)[i]);
}
tag_block[l + 32] = '\n';
}
tag_block[l + 32] = '\n';
if (mode == 1 && t->scdbackup_tag_parm[0]) {
if (t->ms_block > 0) {
iso_msg_submit(t->image->id, ISO_SCDBACKUP_TAG_NOT_0, 0, NULL);
} else {
res = iso_md5_write_scdbackup_tag(t, tag_block, 0);
if (res < 0)
goto ex;
}
}
if (mode == 4) {
if (t->opts_overwrite != NULL)
memcpy(t->opts_overwrite + pos * 2048, tag_block, 2048);
@ -783,6 +853,7 @@ int iso_md5_write_tag(Ecma119Image *t, int flag)
goto ex;
}
}
res = ISO_SUCCESS;
ex:;
if (ctx != NULL)

2
libisofs/messages.c
View File

@ -274,6 +274,8 @@ const char *iso_error_to_msg(int errcode)
return "Checksum tag with unexpected address range encountered";
case ISO_MD5_STREAM_CHANGE:
return "Detected file content changes while it was written into the image";
case ISO_SCDBACKUP_TAG_NOT_0:
return "Session does not start at LBA 0. scdbackup checksum tag not written.";
default:
return "Unknown error";
}