2 * Thanks to Vassily Galinsky for this tool
3 *****************************************************************************
4 AIRLINK AR525W firmware image structure
5 -8:-5 Extended (httpd) header checksum - sum2
6 -4:-1 Extended (httpd) header magic - "ARRN" - 0x4e525241
7 0: 3 Standard (tftpd) header magic - "GMTK" - 0x4b544d47
8 4: 7 Standard (tftpd) header checksum - sum1
10 c: f Size of compressed linux kernel
11 10:13 Size of firmware image file with standard header
12 14:17 Product code - 0x5
13 18:1b Bootloader checksum - sum0
15 20: Compressed linux kernel
16 - Squashfs or jffs2 file system - kernel dependent - either 32 bytes or sector aligned
17 *****************************************************************************/
22 #include <sys/types.h>
26 typedef unsigned long u32
;
27 typedef unsigned char uchar
;
30 0x00000000, 0x77073096, 0xee0e612c, 0x990951ba,
31 0x076dc419, 0x706af48f, 0xe963a535, 0x9e6495a3,
32 0x0edb8832, 0x79dcb8a4, 0xe0d5e91e, 0x97d2d988,
33 0x09b64c2b, 0x7eb17cbd, 0xe7b82d07, 0x90bf1d91,
34 0x1db71064, 0x6ab020f2, 0xf3b97148, 0x84be41de,
35 0x1adad47d, 0x6ddde4eb, 0xf4d4b551, 0x83d385c7,
36 0x136c9856, 0x646ba8c0, 0xfd62f97a, 0x8a65c9ec,
37 0x14015c4f, 0x63066cd9, 0xfa0f3d63, 0x8d080df5,
38 0x3b6e20c8, 0x4c69105e, 0xd56041e4, 0xa2677172,
39 0x3c03e4d1, 0x4b04d447, 0xd20d85fd, 0xa50ab56b,
40 0x35b5a8fa, 0x42b2986c, 0xdbbbc9d6, 0xacbcf940,
41 0x32d86ce3, 0x45df5c75, 0xdcd60dcf, 0xabd13d59,
42 0x26d930ac, 0x51de003a, 0xc8d75180, 0xbfd06116,
43 0x21b4f4b5, 0x56b3c423, 0xcfba9599, 0xb8bda50f,
44 0x2802b89e, 0x5f058808, 0xc60cd9b2, 0xb10be924,
45 0x2f6f7c87, 0x58684c11, 0xc1611dab, 0xb6662d3d,
46 0x76dc4190, 0x01db7106, 0x98d220bc, 0xefd5102a,
47 0x71b18589, 0x06b6b51f, 0x9fbfe4a5, 0xe8b8d433,
48 0x7807c9a2, 0x0f00f934, 0x9609a88e, 0xe10e9818,
49 0x7f6a0dbb, 0x086d3d2d, 0x91646c97, 0xe6635c01,
50 0x6b6b51f4, 0x1c6c6162, 0x856530d8, 0xf262004e,
51 0x6c0695ed, 0x1b01a57b, 0x8208f4c1, 0xf50fc457,
52 0x65b0d9c6, 0x12b7e950, 0x8bbeb8ea, 0xfcb9887c,
53 0x62dd1ddf, 0x15da2d49, 0x8cd37cf3, 0xfbd44c65,
54 0x4db26158, 0x3ab551ce, 0xa3bc0074, 0xd4bb30e2,
55 0x4adfa541, 0x3dd895d7, 0xa4d1c46d, 0xd3d6f4fb,
56 0x4369e96a, 0x346ed9fc, 0xad678846, 0xda60b8d0,
57 0x44042d73, 0x33031de5, 0xaa0a4c5f, 0xdd0d7cc9,
58 0x5005713c, 0x270241aa, 0xbe0b1010, 0xc90c2086,
59 0x5768b525, 0x206f85b3, 0xb966d409, 0xce61e49f,
60 0x5edef90e, 0x29d9c998, 0xb0d09822, 0xc7d7a8b4,
61 0x59b33d17, 0x2eb40d81, 0xb7bd5c3b, 0xc0ba6cad,
62 0xedb88320, 0x9abfb3b6, 0x03b6e20c, 0x74b1d29a,
63 0xead54739, 0x9dd277af, 0x04db2615, 0x73dc1683,
64 0xe3630b12, 0x94643b84, 0x0d6d6a3e, 0x7a6a5aa8,
65 0xe40ecf0b, 0x9309ff9d, 0x0a00ae27, 0x7d079eb1,
66 0xf00f9344, 0x8708a3d2, 0x1e01f268, 0x6906c2fe,
67 0xf762575d, 0x806567cb, 0x196c3671, 0x6e6b06e7,
68 0xfed41b76, 0x89d32be0, 0x10da7a5a, 0x67dd4acc,
69 0xf9b9df6f, 0x8ebeeff9, 0x17b7be43, 0x60b08ed5,
70 0xd6d6a3e8, 0xa1d1937e, 0x38d8c2c4, 0x4fdff252,
71 0xd1bb67f1, 0xa6bc5767, 0x3fb506dd, 0x48b2364b,
72 0xd80d2bda, 0xaf0a1b4c, 0x36034af6, 0x41047a60,
73 0xdf60efc3, 0xa867df55, 0x316e8eef, 0x4669be79,
74 0xcb61b38c, 0xbc66831a, 0x256fd2a0, 0x5268e236,
75 0xcc0c7795, 0xbb0b4703, 0x220216b9, 0x5505262f,
76 0xc5ba3bbe, 0xb2bd0b28, 0x2bb45a92, 0x5cb36a04,
77 0xc2d7ffa7, 0xb5d0cf31, 0x2cd99e8b, 0x5bdeae1d,
78 0x9b64c2b0, 0xec63f226, 0x756aa39c, 0x026d930a,
79 0x9c0906a9, 0xeb0e363f, 0x72076785, 0x05005713,
80 0x95bf4a82, 0xe2b87a14, 0x7bb12bae, 0x0cb61b38,
81 0x92d28e9b, 0xe5d5be0d, 0x7cdcefb7, 0x0bdbdf21,
82 0x86d3d2d4, 0xf1d4e242, 0x68ddb3f8, 0x1fda836e,
83 0x81be16cd, 0xf6b9265b, 0x6fb077e1, 0x18b74777,
84 0x88085ae6, 0xff0f6a70, 0x66063bca, 0x11010b5c,
85 0x8f659eff, 0xf862ae69, 0x616bffd3, 0x166ccf45,
86 0xa00ae278, 0xd70dd2ee, 0x4e048354, 0x3903b3c2,
87 0xa7672661, 0xd06016f7, 0x4969474d, 0x3e6e77db,
88 0xaed16a4a, 0xd9d65adc, 0x40df0b66, 0x37d83bf0,
89 0xa9bcae53, 0xdebb9ec5, 0x47b2cf7f, 0x30b5ffe9,
90 0xbdbdf21c, 0xcabac28a, 0x53b39330, 0x24b4a3a6,
91 0xbad03605, 0xcdd70693, 0x54de5729, 0x23d967bf,
92 0xb3667a2e, 0xc4614ab8, 0x5d681b02, 0x2a6f2b94,
93 0xb40bbe37, 0xc30c8ea1, 0x5a05df1b, 0x2d02ef8d,
98 0x00000000, 0x4e525241,
99 0x4b544d47, 0x00000000, 0x00000000, 0x000afd4a,
100 0x00000000, 0x00000005, 0x00000000, 0x00000000
103 static int JFFS2
= 0;
105 int generate_image(char *kname
, char *fsname
, char *fname
, int EHDR
)
112 fkd
= open(kname
, O_RDONLY
);
113 ffd
= creat(fname
, 0x644);
114 if ((fkd
< 0) || (ffd
< 0))
117 fsd
= open(fsname
, O_RDONLY
);
121 lenk
= lseek(fkd
, 0, SEEK_END
);
123 bk
= (uchar
*) mmap(NULL
, lenk
, PROT_READ
, MAP_SHARED
, fkd
, 0);
124 if (bk
== MAP_FAILED
)
127 lens
= lseek(fsd
, 0, SEEK_END
);
128 bs
= (uchar
*) mmap(NULL
, lens
, PROT_READ
, MAP_SHARED
, fsd
,
130 if (bs
== MAP_FAILED
)
134 write(ffd
, header
, 0x28);
136 write(ffd
, header
+ 2, 0x20);
137 write(ffd
, bk
, lenk
);
140 printf("Padding header+kernel - 0x%x + 0x%x = 0x%x\n",
141 lenk
+ 0x20, ((lenk
+ 0x20) | pad
) + 1 - lenk
- 0x20,
142 ((lenk
+ 0x20) | pad
) + 1);
143 for (i
= 0; i
< ((lenk
+ 0x20) | pad
) + 1 - lenk
- 0x20; i
++)
144 write(ffd
, header
, 1);
146 write(ffd
, bs
, lens
);
154 u32
crc32(uchar
* buf
, u32 len
)
160 for (i
= 0; i
< len
; i
++) {
161 s0
= (s0
>> 8) ^ crctab
[(uchar
) (s0
& 0xFF) ^ buf
[i
]];
167 void usage(char *prog
)
169 printf("Usage: %s [-b 0/1] image_filename \n", prog
);
170 printf(" update checksums for firmware file\n");
172 ("Usage: %s [-b 0/1] [-j] [-e] kernel filesystem image_filename \n",
174 printf(" generate firmware file and update checksums\n");
175 printf("--------------------------------------------------\n");
176 printf(" -e - generate header for web upload\n");
177 printf(" -j - generate header for jffs2 filesystem\n");
178 printf(" -b 0/1 - clear/update bootloader checksum\n");
181 int main(int argc
, char **argv
)
188 extern int optind
, optopt
;
190 while ((c
= getopt(argc
, argv
, "b:e:j")) != -1) {
193 if (optarg
[0] == '1')
203 fprintf(stderr
, "\nError: unknown arg %c\n\n\n",
209 if (((argc
- optind
) < 1) && ((argc
- optind
) > 3)) {
213 if ((argc
- optind
) == 3)
215 (argv
[optind
], argv
[optind
+ 1], argv
[optind
+ 2],
218 "\nError generating image file %s\n\n\n",
223 if ((argc
- optind
) == 2)
225 (argv
[optind
], NULL
, argv
[optind
+ 1], EHDR
)) {
227 "\nError generating image file %s\n\n\n",
233 fd
= open(argv
[argc
- 1], O_RDWR
);
235 fprintf(stderr
, "\nImage file not found %s\n\n\n",
240 long i
, len
= lseek(fd
, 0, SEEK_END
);
241 lseek(fd
, 0, SEEK_SET
);
242 uchar
*buf
= malloc(len
);
245 u32 MagicS
= 0x4b544d47;
246 u32 MagicE
= 0x4e525241;
247 if (*((u32
*) buf
) == MagicS
) {
249 "Image without extra 8 bytes - Standard header\n");
250 *((u32
*) (buf
+ 0x10)) = len
;
251 lseek(fd
, 0x10, SEEK_SET
);
252 write(fd
, buf
+ 0x10, 0x4);
254 } else if ((*((u32
*) (buf
+ 0x8)) == MagicS
)
255 && ((*((u32
*) (buf
+ 0x4)) == MagicE
))) {
257 "Image with extra 8 bytes - Extended header\n");
258 *((u32
*) (buf
+ 0x18)) = len
- 8;
259 lseek(fd
, 0x18, SEEK_SET
);
260 write(fd
, buf
+ 0x18, 0x4);
263 } else if (len
== *((u32
*) (buf
+ 0x10))) {
265 "Image without extra 8 bytes - Standard header\n");
267 } else if (len
== *((u32
*) (buf
+ 0x18)) + 8) {
269 "Image with extra 8 bytes - Extended header\n");
273 fprintf(stderr
, "ERROR: Wrong image size\n");
276 l0
= *((u32
*) & buf
[0x10]);
278 *((u32
*) & buf
[0x18]) = 0;
279 unsigned long sum0
= *((u32
*) & buf
[0x18]);
280 unsigned long sum1
= *((u32
*) & buf
[0x4]);
281 *((u32
*) & buf
[0x4]) = 0x0L
;
282 for (i
= 0; i
< 0x100; i
++)
284 for (i
= 0; i
< 0x100; i
++)
285 b
[0x100 + i
] = buf
[(l0
>> 1) + i
];
286 for (i
= 0; i
< 0x200; i
++)
287 b
[0x200 + i
] = buf
[l0
- 0x200 + i
];
288 *((u32
*) & b
[0x18]) = 0x0L
;
290 sum
= crc32(b
, 0x400);
291 printf("CRC32 sum0 - (%x, %x, %x)\n", sum
, sum0
, 0x400);
293 lseek(fd
, 0x20, SEEK_SET
);
295 lseek(fd
, 0x18, SEEK_SET
);
297 *((u32
*) & buf
[0x18]) = sum
;
299 *((u32
*) & buf
[0x18]) = sum0
;
300 write(fd
, &buf
[0x18], 0x4);
302 sum
= crc32(buf
, l0
);
303 printf("CRC32 sum1 - (%x, %x, %x)\n", sum
, sum1
, l0
);
305 lseek(fd
, 0xC, SEEK_SET
);
307 lseek(fd
, 0x4, SEEK_SET
);
308 *((u32
*) & buf
[0x4]) = sum
;
309 write(fd
, &buf
[0x4], 0x4);
311 unsigned long sum2
= *((u32
*) & buf
[-0x8]);
312 *((u32
*) & buf
[-0x8]) = 0L;
313 sum
= crc32(buf
- 0x4, len
- 0x4);
315 printf("CRC32 sum2 - (%x, %x, %x)\n", sum
, sum2
,
317 lseek(fd
, 0, SEEK_SET
);
318 *((u32
*) & buf
[-0x8]) = sum
;
319 write(fd
, &buf
[-0x8], 0x4);
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