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
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
|
/***************************************************************************
* __________ __ ___.
* Open \______ \ ____ ____ | | _\_ |__ _______ ___
* Source | _// _ \_/ ___\| |/ /| __ \ / _ \ \/ /
* Jukebox | | ( <_> ) \___| < | \_\ ( <_> > < <
* Firmware |____|_ /\____/ \___ >__|_ \|___ /\____/__/\_ \
* \/ \/ \/ \/ \/
* $Id$
*
* Copyright (C) 2017 Amaury Pouly
*
* This program 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 software is distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY
* KIND, either express or implied.
*
****************************************************************************/
#include <string.h>
#include <stdlib.h>
#include <ctype.h>
#include "misc.h"
#include "fw.h"
#include "afi.h"
#define FW_SIG_SIZE 4
#define FW_ENTRIES 240
struct fw_entry_t
{
char name[8];
char ext[3];
uint8_t attr;
uint8_t res[2];
uint16_t version;
uint32_t block_offset; // offset shift by 9
uint32_t size;
uint32_t unk;
uint32_t checksum;
} __attribute__((packed));
struct fw_hdr_t
{
uint8_t sig[FW_SIG_SIZE];
uint32_t res[4];
uint8_t year[2];
uint8_t month;
uint8_t day;
uint16_t usb_vid;
uint16_t usb_pid;
uint32_t checksum;
char productor[16];
char str2[16];
char str3[32];
char dev_name[32];
uint8_t res2[8 * 16];
char usb_name1[8];
char usb_name2[8];
char res3[4 * 16 + 1];
char mtp_name1[33];
char mtp_name2[33];
char mtp_ver[33];
uint16_t mtp_vid;
uint16_t mtp_pid;
char fw_ver[64];
uint32_t res4[2];
struct fw_entry_t entry[FW_ENTRIES];
} __attribute__((packed));
/* the s1fwx source code has a layout but it does not make any sense for firmwares
* found in ATJ2127 for example. In doubt just don't do anything */
struct fw_hdr_f0_t
{
uint8_t sig[FW_SIG_SIZE];
uint8_t res[12];
uint32_t checksum;
uint8_t res2[492];
struct fw_entry_t entry[FW_ENTRIES];
} __attribute__((packed));
const uint8_t g_fw_signature_f2[FW_SIG_SIZE] =
{
0x55, 0xaa, 0xf2, 0x0f
};
const uint8_t g_fw_signature_f0[FW_SIG_SIZE] =
{
0x55, 0xaa, 0xf0, 0x0f
};
static void build_filename_fw(char buf[16], struct fw_entry_t *ent)
{
int pos = 0;
for(int i = 0; i < 8 && ent->name[i] != ' '; i++)
buf[pos++] = ent->name[i];
buf[pos++] = '.';
for(int i = 0; i < 3 && ent->ext[i] != ' '; i++)
buf[pos++] = ent->ext[i];
buf[pos] = 0;
}
int fw_unpack(uint8_t *buf, size_t size, fw_extract_callback_t unpack_cb)
{
struct fw_hdr_t *hdr = (void *)buf;
if(size < sizeof(struct fw_hdr_t))
{
cprintf(GREY, "File too small\n");
return 1;
}
cprintf(BLUE, "Header\n");
cprintf(GREEN, " Signature:");
for(int i = 0; i < FW_SIG_SIZE; i++)
cprintf(YELLOW, " %02x", hdr->sig[i]);
int variant = 0;
if(memcmp(hdr->sig, g_fw_signature_f2, FW_SIG_SIZE) == 0)
{
variant = 0xf2;
cprintf(RED, " Ok (f2 variant)\n");
}
else if(memcmp(hdr->sig, g_fw_signature_f0, FW_SIG_SIZE) == 0)
{
variant = 0xf0;
cprintf(RED, " Ok (f0 variant)\n");
}
else
{
cprintf(RED, " Mismatch\n");
return 1;
}
/* both variants have the same header size, only the fields differ */
if(variant == 0xf2)
{
cprintf_field(" USB VID: ", "0x%x\n", hdr->usb_vid);
cprintf_field(" USB PID: ", "0x%x\n", hdr->usb_pid);
cprintf_field(" Date: ", "%x/%x/%02x%02x\n", hdr->day, hdr->month, hdr->year[0], hdr->year[1]);
cprintf_field(" Checksum: ", "%x\n", hdr->checksum);
cprintf_field(" Productor: ", "%.16s\n", hdr->productor);
cprintf_field(" String 2: ", "%.16s\n", hdr->str2);
cprintf_field(" String 3: ", "%.32s\n", hdr->str3);
cprintf_field(" Device Name: ", "%.32s\n", hdr->dev_name);
cprintf(GREEN, " Unknown:\n");
for(int i = 0; i < 8; i++)
{
cprintf(YELLOW, " ");
for(int j = 0; j < 16; j++)
cprintf(YELLOW, "%02x ", hdr->res2[i * 16 + j]);
cprintf(YELLOW, "\n");
}
cprintf_field(" USB Name 1: ", "%.8s\n", hdr->usb_name1);
cprintf_field(" USB Name 2: ", "%.8s\n", hdr->usb_name2);
cprintf_field(" MTP Name 1: ", "%.32s\n", hdr->mtp_name1);
cprintf_field(" MTP Name 2: ", "%.32s\n", hdr->mtp_name2);
cprintf_field(" MTP Version: ", "%.32s\n", hdr->mtp_ver);
cprintf_field(" MTP VID: ", "0x%x\n", hdr->mtp_vid);
cprintf_field(" MTP PID: ", "0x%x\n", hdr->mtp_pid);
cprintf_field(" FW Version: ", "%.64s\n", hdr->fw_ver);
}
else
{
/* struct fw_hdr_f0_t *hdr_f0 = (void *)hdr; */
cprintf(GREEN, " Header not dumped because format is unclear.\n");
}
cprintf(BLUE, "Entries\n");
for(int i = 0; i < FW_ENTRIES; i++)
{
if(hdr->entry[i].name[0] == 0)
continue;
struct fw_entry_t *entry = &hdr->entry[i];
char filename[16];
build_filename_fw(filename, entry);
cprintf(RED, " %s\n", filename);
cprintf_field(" Attr: ", "%02x\n", entry->attr);
cprintf_field(" Offset: ", "0x%x\n", entry->block_offset << 9);
cprintf_field(" Size: ", "0x%x\n", entry->size);
cprintf_field(" Unknown: ", "%x\n", entry->unk);
cprintf_field(" Checksum: ", "0x%x ", entry->checksum);
uint32_t chk = afi_checksum(buf + (entry->block_offset << 9), entry->size);
if(chk != entry->checksum)
{
cprintf(RED, "Mismatch\n");
return 1;
}
else
cprintf(RED, "Ok\n");
int ret = unpack_cb(filename, buf + (entry->block_offset << 9), entry->size);
if(ret != 0)
return ret;
}
return 0;
}
bool fw_check(uint8_t *buf, size_t size)
{
struct fw_hdr_t *hdr = (void *)buf;
if(size < sizeof(struct fw_hdr_t))
return false;
if(memcmp(hdr->sig, g_fw_signature_f2, FW_SIG_SIZE) == 0)
return true;
if(memcmp(hdr->sig, g_fw_signature_f0, FW_SIG_SIZE) == 0)
return true;
return false;
}
|
