OpenWrt – Blame information for rev 4

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4 office 1 /*
2 * WRT400n - Firmware Generation Creator
3 *
4 * Creates a firmware image for the Linksys WRT400n router,
5 * that can be uploaded via the firmware upload page,
6 * from a kernel image file and root fs file
7 *
8 * Author: Sandeep Mistry
9 */
10 #include <arpa/inet.h>
11 #include <fcntl.h>
12 #include <stdio.h>
13 #include <stdint.h>
14 #include <string.h>
15 #include <sys/types.h>
16 #include <sys/stat.h>
17 #include <unistd.h>
18  
19 #include "cyg_crc.h"
20  
21 // https://dev.openwrt.org/browser/trunk/target/linux/rdc-2.6/files/drivers/mtd/maps/rdc3210.c
22 static uint32_t crctab[257] =
23 {
24 0x00000000, 0x77073096, 0xee0e612c, 0x990951ba,
25 0x076dc419, 0x706af48f, 0xe963a535, 0x9e6495a3,
26 0x0edb8832, 0x79dcb8a4, 0xe0d5e91e, 0x97d2d988,
27 0x09b64c2b, 0x7eb17cbd, 0xe7b82d07, 0x90bf1d91,
28 0x1db71064, 0x6ab020f2, 0xf3b97148, 0x84be41de,
29 0x1adad47d, 0x6ddde4eb, 0xf4d4b551, 0x83d385c7,
30 0x136c9856, 0x646ba8c0, 0xfd62f97a, 0x8a65c9ec,
31 0x14015c4f, 0x63066cd9, 0xfa0f3d63, 0x8d080df5,
32 0x3b6e20c8, 0x4c69105e, 0xd56041e4, 0xa2677172,
33 0x3c03e4d1, 0x4b04d447, 0xd20d85fd, 0xa50ab56b,
34 0x35b5a8fa, 0x42b2986c, 0xdbbbc9d6, 0xacbcf940,
35 0x32d86ce3, 0x45df5c75, 0xdcd60dcf, 0xabd13d59,
36 0x26d930ac, 0x51de003a, 0xc8d75180, 0xbfd06116,
37 0x21b4f4b5, 0x56b3c423, 0xcfba9599, 0xb8bda50f,
38 0x2802b89e, 0x5f058808, 0xc60cd9b2, 0xb10be924,
39 0x2f6f7c87, 0x58684c11, 0xc1611dab, 0xb6662d3d,
40 0x76dc4190, 0x01db7106, 0x98d220bc, 0xefd5102a,
41 0x71b18589, 0x06b6b51f, 0x9fbfe4a5, 0xe8b8d433,
42 0x7807c9a2, 0x0f00f934, 0x9609a88e, 0xe10e9818,
43 0x7f6a0dbb, 0x086d3d2d, 0x91646c97, 0xe6635c01,
44 0x6b6b51f4, 0x1c6c6162, 0x856530d8, 0xf262004e,
45 0x6c0695ed, 0x1b01a57b, 0x8208f4c1, 0xf50fc457,
46 0x65b0d9c6, 0x12b7e950, 0x8bbeb8ea, 0xfcb9887c,
47 0x62dd1ddf, 0x15da2d49, 0x8cd37cf3, 0xfbd44c65,
48 0x4db26158, 0x3ab551ce, 0xa3bc0074, 0xd4bb30e2,
49 0x4adfa541, 0x3dd895d7, 0xa4d1c46d, 0xd3d6f4fb,
50 0x4369e96a, 0x346ed9fc, 0xad678846, 0xda60b8d0,
51 0x44042d73, 0x33031de5, 0xaa0a4c5f, 0xdd0d7cc9,
52 0x5005713c, 0x270241aa, 0xbe0b1010, 0xc90c2086,
53 0x5768b525, 0x206f85b3, 0xb966d409, 0xce61e49f,
54 0x5edef90e, 0x29d9c998, 0xb0d09822, 0xc7d7a8b4,
55 0x59b33d17, 0x2eb40d81, 0xb7bd5c3b, 0xc0ba6cad,
56 0xedb88320, 0x9abfb3b6, 0x03b6e20c, 0x74b1d29a,
57 0xead54739, 0x9dd277af, 0x04db2615, 0x73dc1683,
58 0xe3630b12, 0x94643b84, 0x0d6d6a3e, 0x7a6a5aa8,
59 0xe40ecf0b, 0x9309ff9d, 0x0a00ae27, 0x7d079eb1,
60 0xf00f9344, 0x8708a3d2, 0x1e01f268, 0x6906c2fe,
61 0xf762575d, 0x806567cb, 0x196c3671, 0x6e6b06e7,
62 0xfed41b76, 0x89d32be0, 0x10da7a5a, 0x67dd4acc,
63 0xf9b9df6f, 0x8ebeeff9, 0x17b7be43, 0x60b08ed5,
64 0xd6d6a3e8, 0xa1d1937e, 0x38d8c2c4, 0x4fdff252,
65 0xd1bb67f1, 0xa6bc5767, 0x3fb506dd, 0x48b2364b,
66 0xd80d2bda, 0xaf0a1b4c, 0x36034af6, 0x41047a60,
67 0xdf60efc3, 0xa867df55, 0x316e8eef, 0x4669be79,
68 0xcb61b38c, 0xbc66831a, 0x256fd2a0, 0x5268e236,
69 0xcc0c7795, 0xbb0b4703, 0x220216b9, 0x5505262f,
70 0xc5ba3bbe, 0xb2bd0b28, 0x2bb45a92, 0x5cb36a04,
71 0xc2d7ffa7, 0xb5d0cf31, 0x2cd99e8b, 0x5bdeae1d,
72 0x9b64c2b0, 0xec63f226, 0x756aa39c, 0x026d930a,
73 0x9c0906a9, 0xeb0e363f, 0x72076785, 0x05005713,
74 0x95bf4a82, 0xe2b87a14, 0x7bb12bae, 0x0cb61b38,
75 0x92d28e9b, 0xe5d5be0d, 0x7cdcefb7, 0x0bdbdf21,
76 0x86d3d2d4, 0xf1d4e242, 0x68ddb3f8, 0x1fda836e,
77 0x81be16cd, 0xf6b9265b, 0x6fb077e1, 0x18b74777,
78 0x88085ae6, 0xff0f6a70, 0x66063bca, 0x11010b5c,
79 0x8f659eff, 0xf862ae69, 0x616bffd3, 0x166ccf45,
80 0xa00ae278, 0xd70dd2ee, 0x4e048354, 0x3903b3c2,
81 0xa7672661, 0xd06016f7, 0x4969474d, 0x3e6e77db,
82 0xaed16a4a, 0xd9d65adc, 0x40df0b66, 0x37d83bf0,
83 0xa9bcae53, 0xdebb9ec5, 0x47b2cf7f, 0x30b5ffe9,
84 0xbdbdf21c, 0xcabac28a, 0x53b39330, 0x24b4a3a6,
85 0xbad03605, 0xcdd70693, 0x54de5729, 0x23d967bf,
86 0xb3667a2e, 0xc4614ab8, 0x5d681b02, 0x2a6f2b94,
87 0xb40bbe37, 0xc30c8ea1, 0x5a05df1b, 0x2d02ef8d,
88  
89 };
90  
91 static uint32_t crc32(uint8_t* buf, uint32_t len)
92 {
93 register int i;
94 uint32_t sum;
95 register uint32_t s0;
96 s0 = ~0;
97 for (i = 0; i < len; i++)
98 {
99 s0 = (s0 >> 8) ^ crctab[(uint8_t) (s0 & 0xFF) ^ buf[i]];
100 }
101 sum = ~s0;
102 return sum;
103 }
104  
105 #define HEADERSIZE 60
106 #define MAGIC "GMTKRT400N"
107  
108 // global variables
109 uint8_t kernelbuf[0x100000]; // kernel - lzma - uImage
110 uint8_t rootfsbuf[0x2FFFC4]; // root - squashfs
111  
112 uint8_t buf[0x400000]; // buffer for image
113  
114  
115 // Header format:
116 //
117 // GPL Tarball: http://downloads.linksysbycisco.com/downloads/WRT400N_1.0.01.19_US.tar,0.gz
118 // File: WRT400N_1.0.01.19_US/FW_WRT400N_1.0.01.19_US_20081229/GTK/user/include/fw_upgrade.h
119 //
120 //
121 // Struct:
122 // typedef struct
123 // {
124 // UINT32 checksum; /* CRC32 */
125 // UINT8 magic[11]; /* The value of GTIMG_MAGIC */
126 // UINT32 kernel_length; /* The length of the kernel image */
127 // //UINT32 kernel_entry_point; /* Kernel's entry point for RedBoot's information */
128 // UINT32 kernel_upgrade_flag; /* Set to 1 if we need to upgrade the kernel parition of the Flash */
129 // UINT32 rootfs_length; /* The length of the rootfs image */
130 // //UINT32 rootfs_entry_point; /* Not in use */
131 // UINT32 rootfs_upgrade_flag; /* Set to 1 if we need to upgrade the rootfs parition of the Flash */
132 //
133 // // Add 3 items by Vic Yu, 2006-05/10
134 // UINT32 kernel_checksum;
135 // UINT32 rootfs_checksum;
136 // UINT32 fw_totalsize;
137 // UINT32 reserved[4];
138 // }imghdr_t , *pLinuxFWHeader_T;
139 //
140 //
141 // Description
142 // - checksum: CRC32 of kernel and root fs, back to back
143 // - magic: GMTKRT400N
144 // - kernel_length: kernel length in bytes
145 // - kernel_upgrade_flag: should we upgrade the kernel - set to 1
146 // - rootfs_length: root fs length in byte
147 // - rootfs_upgrade_flag: should we upgrade the root fs - set to 1
148 // - kernel_checksum: Gary S. Brown's 32 bit CRC algorithm for kernel, with remaining bits
149 // set to 0xFF upto 0x100000 bytes (total length)
150 // - rootfs_checksum: Gary S. Brown's 32 bit CRC algorithm for root fs, with remaining bits
151 // set to 0xFF upto 0x2FFFC4 bytes (total length)
152 // - fw_totalsize: total firmware image file length (header length + kernel length + root fs length)
153 // - reserved[4]: reserved ??? - set to all 0xFF
154  
155  
156  
157 int main(int argc, char *argv[])
158 {
159 // file descriptors ...
160 int kernelfd = -1;
161 int rootfsfd = -1;
162 int outfd = -1;
163  
164 char* kernelfilename = NULL;
165 char* rootfsfilename = NULL;
166 char* outputfilename = NULL;
167  
168 // file sizes
169 uint32_t kernelsize = 0;
170 uint32_t rootfssize = 0;
171 uint32_t totalsize = 0;
172  
173 // header flags
174 uint32_t kernelflag = 0;
175 uint32_t rootfsflag = 0;
176  
177 // checksums
178 uint32_t kernelchecksum = 0;
179 uint32_t rootfschecksum = 0;
180 uint32_t crc = 0;
181  
182 if(argc != 4)
183 {
184 printf("Usage:\n\t%s <kernel file> <rootfs file> <output file>\n", argv[0]);
185 return 1;
186 }
187  
188 kernelfilename = argv[1];
189 rootfsfilename = argv[2];
190 outputfilename = argv[3];
191  
192 // Fill the kernel, rootfs, main buffer
193 memset(kernelbuf, 0xFF, sizeof(kernelbuf));
194 memset(rootfsbuf, 0xFF, sizeof(rootfsbuf));
195 memset(buf, 0xFF, sizeof(buf));
196  
197 // open the kernel ..
198 kernelfd = open(kernelfilename, O_RDONLY);
199  
200 if(kernelfd == -1)
201 {
202 printf("Error: opening '%s'\n", kernelfilename);
203 goto done;
204 }
205  
206 // read in the kernel ...
207 kernelsize = read(kernelfd, kernelbuf, sizeof(kernelbuf));
208  
209 if(kernelsize == -1)
210 {
211 printf("Error: reading '%s'\n", kernelfilename);
212 goto done;
213 }
214  
215 // calculate the kernel checksum ...
216 kernelchecksum = cyg_crc32_accumulate(0, kernelbuf, sizeof(kernelbuf));
217  
218 // print out stats
219 printf("%s: size %d (0x%x), crc32 = 0x%x\n", kernelfilename, kernelsize, kernelsize, kernelchecksum);
220  
221  
222 // open the root fs ..
223 rootfsfd = open(rootfsfilename, O_RDONLY);
224  
225 if(rootfsfd == -1)
226 {
227 printf("Error: opening '%s'\n", rootfsfilename);
228 goto done;
229 }
230  
231 // read in the root fs ..
232 rootfssize = read(rootfsfd, rootfsbuf, sizeof(rootfsbuf));
233  
234 if(rootfssize == -1)
235 {
236 printf("Error: reading '%s'\n", rootfsfilename);
237 goto done;
238 }
239  
240 // calculate the root fs checksum ...
241 rootfschecksum = cyg_crc32_accumulate(0, rootfsbuf, sizeof(rootfsbuf));
242  
243 // print out stats
244 printf("%s: size %d (0x%x), crc32 = 0x%x\n", rootfsfilename, rootfssize, rootfssize, rootfschecksum);
245  
246  
247 // now for the header ...
248  
249 totalsize = HEADERSIZE;
250  
251 // copy over kernel
252 memcpy(buf + totalsize, kernelbuf, kernelsize);
253 totalsize += kernelsize;
254  
255 // copy over root fs
256 memcpy(buf + totalsize, rootfsbuf, rootfssize);
257 totalsize += rootfssize;
258  
259 // calculate crc
260 crc = crc32(buf + HEADERSIZE, totalsize - HEADERSIZE);
261  
262 // print some stats out
263 printf("crc = 0x%x, total size = %d (0x%x)\n", crc, totalsize, totalsize);
264  
265 // copy crc into header
266 crc = htonl(crc);
267 memcpy(buf, &crc, sizeof(crc));
268  
269 // copy over magic
270 strcpy((char *)buf + 4, MAGIC);
271  
272 // copy over kernel size
273 kernelsize = htonl(kernelsize);
274 memcpy(buf + 16, &kernelsize, sizeof(kernelsize));
275  
276 // copy over kernal flag
277 kernelflag = htonl(0x1);
278 memcpy(buf + 20, &kernelflag, sizeof(kernelflag));
279  
280 // copy over root fs size
281 rootfssize = htonl(rootfssize);
282 memcpy(buf + 24, &rootfssize, sizeof(rootfssize));
283  
284 // copy over root fs flag
285 rootfsflag = htonl(0x1);
286 memcpy(buf + 28, &rootfsflag, sizeof(rootfsflag));
287  
288 // copy over kernel check sum
289 kernelchecksum = htonl(kernelchecksum);
290 memcpy(buf + 32, &kernelchecksum, sizeof(kernelchecksum));
291  
292 // copy over root fs checksum
293 rootfschecksum = htonl(rootfschecksum);
294 memcpy(buf + 36, &rootfschecksum, sizeof(rootfschecksum));
295  
296 // copy over total size
297 totalsize = htonl(totalsize);
298 memcpy(buf + 40, &totalsize, sizeof(totalsize));
299  
300 // undo the htonl (for write)
301 totalsize = htonl(totalsize);
302  
303  
304 // write out the file from the buffer
305 outfd = open(outputfilename, O_CREAT | O_WRONLY | O_TRUNC, S_IRUSR | S_IWUSR | S_IRGRP | S_IROTH);
306  
307 if(outfd == -1)
308 {
309 printf("ERROR: opening '%s' for write\n", outputfilename);
310 }
311  
312 write(outfd, buf, totalsize);
313  
314 done:
315 // close open fd's
316  
317 if(kernelfd != -1)
318 {
319 close(kernelfd);
320 kernelfd = -1;
321 }
322  
323 if(rootfsfd != -1)
324 {
325 close(rootfsfd);
326 rootfsfd = -1;
327 }
328  
329 if(outfd != -1)
330 {
331 close(outfd);
332 outfd = -1;
333 }
334  
335 return 0;
336 }