1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
|
/*
File: file_addressbook.c
Copyright (C) 2007-2008 Christophe GRENIER <grenier@cgsecurity.org>
This software is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation; either version 2 of the License, or
(at your option) any later version.
This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License along
with this program; if not, write the Free Software Foundation, Inc., 51
Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
*/
#if !defined(SINGLE_FORMAT) || defined(SINGLE_FORMAT_addressbook)
#ifdef HAVE_CONFIG_H
#include <config.h>
#endif
#include <stdio.h>
#include "types.h"
#include "common.h"
#include "filegen.h"
#include "log.h"
/*@ requires valid_register_header_check(file_stat); */
static void register_header_check_ab(file_stat_t *file_stat);
const file_hint_t file_hint_addressbook= {
.extension="ab",
.description="MAC Address Book",
.max_filesize=PHOTOREC_MAX_FILE_SIZE,
.recover=1,
.enable_by_default=1,
.register_header_check=®ister_header_check_ab
};
struct ab_header
{
char magic[4];
uint32_t size;
} __attribute__ ((gcc_struct, __packed__));
/*@
@ requires file_recovery->data_check==&data_check_addressbook;
@ requires valid_data_check_param(buffer, buffer_size, file_recovery);
@ terminates \true;
@ ensures valid_data_check_result(\result, file_recovery);
@ assigns file_recovery->calculated_file_size;
@*/
static data_check_t data_check_addressbook(const unsigned char *buffer, const unsigned int buffer_size, file_recovery_t *file_recovery)
{
/*@ assert file_recovery->calculated_file_size <= PHOTOREC_MAX_FILE_SIZE; */
/*@ assert file_recovery->file_size <= PHOTOREC_MAX_FILE_SIZE; */
/*@
@ loop assigns file_recovery->calculated_file_size;
@ loop variant file_recovery->file_size + buffer_size/2 - (file_recovery->calculated_file_size + 8);
@*/
while(file_recovery->calculated_file_size + buffer_size/2 >= file_recovery->file_size &&
file_recovery->calculated_file_size + 8 < file_recovery->file_size + buffer_size/2)
{
const unsigned int i=file_recovery->calculated_file_size + buffer_size/2 - file_recovery->file_size;
/*@ assert 0 <= i < buffer_size - 8; */
const struct ab_header *ab=(const struct ab_header *)&buffer[i];
const unsigned int length=be32(ab->size);
#ifdef DEBUG_AB
log_debug("data_check_addressbook i=0x%x buffer_size=0x%x calculated_file_size=%lu file_size=%lu\n",
i, buffer_size,
(long unsigned)file_recovery->calculated_file_size,
(long unsigned)file_recovery->file_size);
dump_log(buffer+i,8);
#endif
if(ab->magic[0]!='L' || ab->magic[1]!='J' || ab->magic[3]!=0x00 || length<8)
return DC_STOP;
file_recovery->calculated_file_size+=length;
}
return DC_CONTINUE;
}
/*@
@ requires buffer_size >= sizeof(struct ab_header);
@ requires separation: \separated(&file_hint_addressbook, buffer+(..), file_recovery, file_recovery_new);
@ requires valid_header_check_param(buffer, buffer_size, safe_header_only, file_recovery, file_recovery_new);
@ terminates \true;
@ ensures valid_header_check_result(\result, file_recovery_new);
@ assigns *file_recovery_new;
@*/
static int header_check_addressbook(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)
{
const struct ab_header *ab=(const struct ab_header *)buffer;
const unsigned int length=be32(ab->size);
if(ab->magic[0]!='L' || ab->magic[1]!='J' || ab->magic[3]!=0x00 || length<8)
return 0;
if(ab->magic[2]!=0x1a && ab->magic[2]!=0x0a)
return 0;
reset_file_recovery(file_recovery_new);
file_recovery_new->extension=file_hint_addressbook.extension;
if(file_recovery_new->blocksize >= 8)
{
file_recovery_new->calculated_file_size=length;
file_recovery_new->data_check=&data_check_addressbook;
file_recovery_new->file_check=&file_check_size;
}
return 1;
}
static void register_header_check_ab(file_stat_t *file_stat)
{
static const unsigned char ab_header[2]={ 'L', 'J' };
register_header_check(0, ab_header,sizeof(ab_header), &header_check_addressbook, file_stat);
}
#endif
|
