99 lines
3.6 KiB
C
99 lines
3.6 KiB
C
/*
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File: file_evt.c
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Copyright (C) 2007-2008 Christophe GRENIER <grenier@cgsecurity.org>
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This software is free software; you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation; either version 2 of the License, or
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(at your option) any later version.
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This program is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License along
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with this program; if not, write the Free Software Foundation, Inc., 51
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Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
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*/
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#ifdef HAVE_CONFIG_H
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#include <config.h>
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#endif
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#ifdef HAVE_STRING_H
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#include <string.h>
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#endif
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#include <stdio.h>
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#include "types.h"
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#include "common.h"
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#include "filegen.h"
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#include "log.h"
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static void register_header_check_evt(file_stat_t *file_stat);
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static int header_check_evt(const unsigned char *buffer, const unsigned int buffer_size, const unsigned int safe_header_only, const file_recovery_t *file_recovery, file_recovery_t *file_recovery_new);
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static int data_check_evt(const unsigned char *buffer, const unsigned int buffer_size, file_recovery_t *file_recovery);
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const file_hint_t file_hint_evt= {
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.extension="evt",
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.description="Windows Event Log",
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.min_header_distance=0,
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.max_filesize=PHOTOREC_MAX_FILE_SIZE,
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.recover=1,
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.enable_by_default=1,
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.register_header_check=®ister_header_check_evt
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};
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static const unsigned char evt_header[8]= {0x30, 0x00, 0x00, 0x00, 'L', 'f', 'L', 'e'};
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static void register_header_check_evt(file_stat_t *file_stat)
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{
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register_header_check(0, evt_header,sizeof(evt_header), &header_check_evt, file_stat);
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}
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static int header_check_evt(const unsigned char *buffer, const unsigned int buffer_size, const unsigned int safe_header_only, const file_recovery_t *file_recovery, file_recovery_t *file_recovery_new)
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{
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if(memcmp(buffer,evt_header,sizeof(evt_header))==0)
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{
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reset_file_recovery(file_recovery_new);
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file_recovery_new->calculated_file_size=buffer[0] + (buffer[1]<<8) + (buffer[2]<<16) + (buffer[3]<<24);
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file_recovery_new->data_check=&data_check_evt;
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file_recovery_new->file_check=&file_check_size;
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file_recovery_new->extension=file_hint_evt.extension;
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return 1;
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}
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return 0;
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}
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static int data_check_evt(const unsigned char *buffer, const unsigned int buffer_size, file_recovery_t *file_recovery)
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{
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while(file_recovery->calculated_file_size + buffer_size/2 >= file_recovery->file_size &&
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file_recovery->calculated_file_size + 8 < file_recovery->file_size + buffer_size/2)
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{
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unsigned int i=file_recovery->calculated_file_size - file_recovery->file_size + buffer_size/2;
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if((buffer[i+4]=='L' && buffer[i+5]=='f' && buffer[i+6]=='L' && buffer[i+7]=='e') ||
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(buffer[i+4]==0x11 && buffer[i+5]==0x11 && buffer[i+6]==0x11 && buffer[i+7]==0x11) ||
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(buffer[i+4]==0x22 && buffer[i+5]==0x22 && buffer[i+6]==0x22 && buffer[i+7]==0x22) ||
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(buffer[i+4]==0x33 && buffer[i+5]==0x33 && buffer[i+6]==0x33 && buffer[i+7]==0x33) ||
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(buffer[i+4]==0x44 && buffer[i+5]==0x44 && buffer[i+6]==0x44 && buffer[i+7]==0x44))
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{
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unsigned int length=(buffer[i+0] + (buffer[i+1]<<8) + (buffer[i+2]<<16) + (buffer[i+3]<<24));
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if(length<8)
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{
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return 2;
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}
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file_recovery->calculated_file_size+=length;
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}
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else
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{
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return 2;
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}
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}
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/*
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log_trace("data_check_evt record_offset=0x%x\n\n",record_offset);
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*/
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return 1;
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}
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