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/*
** blkcat
** The Sleuth Kit
**
** Given an image , block number, and size, display the contents
** of the block to stdout.
**
** Brian Carrier [carrier <at> sleuthkit [dot] org]
** Copyright (c) 2006-2011 Brian Carrier, Basis Technology. All Rights reserved
** Copyright (c) 2003-2005 Brian Carrier. All rights reserved
**
** TASK
** Copyright (c) 2002 Brian Carrier, @stake Inc. All rights reserved
**
** TCTUTILs
** Copyright (c) 2001 Brian Carrier. All rights reserved
**
**
** This software is distributed under the Common Public License 1.0
**
*/
#include "tsk_fs_i.h"
#include <ctype.h>
/**
* \file dcat_lib.c
* Contains the library API functions used by the TSK blkcat command
* line tool.
*/
/**
* \internal
* Print block statistics to stdout
*
* @param fs File system to analyze
*/
static void
stats(TSK_FS_INFO * fs)
{
tsk_printf("%d: Size of Addressable Unit\n", fs->block_size);
}
/**
* Read a specific number of blocks and print the contents to STDOUT
*
* @param fs File system to analyze
* @param lclflags flags
* @param addr Starting block address to read from
* @param read_num_units Number of blocks to read
*
* @return 1 on error and 0 on success
*/
uint8_t
tsk_fs_blkcat(TSK_FS_INFO * fs, TSK_FS_BLKCAT_FLAG_ENUM lclflags,
TSK_DADDR_T addr, TSK_DADDR_T read_num_units)
{
char *buf;
TSK_DADDR_T i;
if (lclflags & TSK_FS_BLKCAT_STAT) {
stats(fs);
return 0;
}
if (addr + read_num_units - 1 > fs->last_block) {
tsk_error_reset();
tsk_error_set_errno(TSK_ERR_FS_ARG);
tsk_error_set_errstr
("tsk_fs_blkcat: requested size is larger than last block in image (%"
PRIuDADDR ")", fs->last_block);
return 1;
}
#ifdef TSK_WIN32
if (-1 == _setmode(_fileno(stdout), _O_BINARY)) {
tsk_error_reset();
tsk_error_set_errno(TSK_ERR_FS_WRITE);
tsk_error_set_errstr
("blkcat_lib: error setting stdout to binary: %s",
strerror(errno));
return 1;
}
#endif
if (lclflags & TSK_FS_BLKCAT_HTML) {
tsk_printf("<html>\n");
tsk_printf("<head>\n");
tsk_printf("<title>Unit: %" PRIuDADDR " Size: %" PRIuDADDR
" bytes</title>\n", addr, read_num_units * fs->block_size);
tsk_printf("</head>\n");
tsk_printf("<body>\n");
}
if ((lclflags & TSK_FS_BLKCAT_HEX) && (lclflags & TSK_FS_BLKCAT_HTML))
tsk_printf("<table border=0>\n");
if ((buf = tsk_malloc(fs->block_size)) == NULL)
return 1;
for (i = 0; i < read_num_units; i++) {
ssize_t cnt;
/* Read the block */
cnt = tsk_fs_read_block(fs, addr + i, buf, fs->block_size);
if (cnt != fs->block_size) {
if (cnt >= 0) {
tsk_error_reset();
tsk_error_set_errno(TSK_ERR_FS_READ);
}
tsk_error_set_errstr("blkcat: Error reading block at %"
PRIuDADDR, addr);
return 1;
}
/* do a hexdump like printout */
if (lclflags & TSK_FS_BLKCAT_HEX) {
TSK_OFF_T idx1, idx2;
for (idx1 = 0; idx1 < fs->block_size; idx1 += 16) {
/* Print the offset */
if (lclflags & TSK_FS_BLKCAT_HTML)
tsk_printf("<tr><td>%" PRIdOFF "</td>",
i * fs->block_size + idx1);
else
tsk_printf("%" PRIdOFF "\t",
i * fs->block_size + idx1);
/* Print the hex */
for (idx2 = 0; idx2 < 16; idx2++) {
if ((lclflags & TSK_FS_BLKCAT_HTML)
&& (0 == (idx2 % 4)))
tsk_printf("<td>");
tsk_printf("%.2x", buf[idx2 + idx1] & 0xff);
if (3 == (idx2 % 4)) {
if (lclflags & TSK_FS_BLKCAT_HTML)
tsk_printf("</td>");
else
tsk_printf(" ");
}
}
/* Print the ASCII */
tsk_printf("\t");
for (idx2 = 0; idx2 < 16; idx2++) {
if ((lclflags & TSK_FS_BLKCAT_HTML)
&& (0 == (idx2 % 4)))
tsk_printf("<td>");
if ((isascii((int) buf[idx2 + idx1])) &&
(!iscntrl((int) buf[idx2 + idx1])))
tsk_printf("%c", buf[idx2 + idx1]);
else
tsk_printf(".");
if (3 == (idx2 % 4)) {
if (lclflags & TSK_FS_BLKCAT_HTML)
tsk_printf("</td>");
else
tsk_printf(" ");
}
}
if (lclflags & TSK_FS_BLKCAT_HTML)
tsk_printf("</tr>");
tsk_printf("\n");
}
}
/* print in all ASCII */
else if (lclflags & TSK_FS_BLKCAT_ASCII) {
TSK_OFF_T idx;
for (idx = 0; idx < fs->block_size; idx++) {
if ((isprint((int) buf[idx]))
|| (buf[idx] == '\t')) {
tsk_printf("%c", buf[idx]);
}
else if ((buf[idx] == '\n')
|| (buf[idx] == '\r')) {
if (lclflags & TSK_FS_BLKCAT_HTML)
tsk_printf("<br>");
tsk_printf("%c", buf[idx]);
}
else
tsk_printf(".");
}
}
/* print raw */
else {
if (fwrite(buf, fs->block_size, 1, stdout) != 1) {
tsk_error_reset();
tsk_error_set_errno(TSK_ERR_FS_WRITE);
tsk_error_set_errstr
("blkcat_lib: error writing to stdout: %s",
strerror(errno));
free(buf);
return 1;
}
}
}
free(buf);
if (lclflags & TSK_FS_BLKCAT_HEX) {
if (lclflags & TSK_FS_BLKCAT_HTML)
tsk_printf("</table>\n");
else
tsk_printf("\n");
}
else if (lclflags & TSK_FS_BLKCAT_ASCII) {
if (lclflags & TSK_FS_BLKCAT_HTML)
tsk_printf("<br>");
tsk_printf("\n");
}
else {
if (lclflags & TSK_FS_BLKCAT_HTML)
tsk_printf("<br>");
}
if (lclflags & TSK_FS_BLKCAT_HTML)
tsk_printf("</body>\n</html>\n");
return 0;
}
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