OpenWrt – Blame information for rev 1
?pathlinks?
Rev | Author | Line No. | Line |
---|---|---|---|
1 | office | 1 | /* |
2 | * Copyright (C) 2015 Thomas Hebb <tommyhebb@gmail.com> |
||
3 | * Copyright (C) 2016 Christian Lamparter <chunkeey@googlemail.com> |
||
4 | * |
||
5 | * The format of the header this tool generates was first documented by |
||
6 | * Chris Blake <chrisrblake93 (at) gmail.com> in a shell script of the |
||
7 | * same purpose. I have created this reimplementation at his request. The |
||
8 | * original script can be found at: |
||
9 | * <https://github.com/riptidewave93/meraki-partbuilder> |
||
10 | * |
||
11 | * Support for the old header format, which is used by the Cisco Z1 AP |
||
12 | * has been reverse engineered from the nandloader's nand_load_bk function. |
||
13 | * The original code is part of Cisco's GPL code and can be found at: |
||
14 | * <https://github.com/riptidewave93/meraki-linux> |
||
15 | * |
||
16 | * This program is free software; you can redistribute it and/or modify it |
||
17 | * under the terms of the GNU General Public License version 2 as published |
||
18 | * by the Free Software Foundation. |
||
19 | * |
||
20 | */ |
||
21 | |||
22 | #include <stdio.h> |
||
23 | #include <stdlib.h> |
||
24 | #include <stdbool.h> |
||
25 | #include <string.h> |
||
26 | #include <libgen.h> |
||
27 | #include <endian.h> |
||
28 | #include <getopt.h> |
||
29 | #include <errno.h> |
||
30 | #include <arpa/inet.h> |
||
31 | |||
32 | #define PADDING_BYTE 0xff |
||
33 | |||
34 | #define HDR_LENGTH 0x00000020 |
||
35 | #define HDR_OFF_MAGIC1 0 |
||
36 | #define HDR_OFF_LOAD_ADDR 4 |
||
37 | #define HDR_OFF_IMAGELEN 8 |
||
38 | #define HDR_OFF_ENTRY 12 |
||
39 | #define HDR_OFF_CHECKSUM 16 |
||
40 | #define HDR_OFF_FILLER0 20 |
||
41 | #define HDR_OFF_FILLER1 24 |
||
42 | #define HDR_OFF_FILLER2 28 |
||
43 | |||
44 | struct board_info { |
||
45 | char *id; |
||
46 | char *description; |
||
47 | uint32_t magic; |
||
48 | uint32_t imagelen; |
||
49 | uint32_t load_addr; |
||
50 | uint32_t entry; |
||
51 | }; |
||
52 | |||
53 | /* |
||
54 | * Globals |
||
55 | */ |
||
56 | static char *progname; |
||
57 | static bool strip_padding; |
||
58 | |||
59 | static char *board_id; |
||
60 | static const struct board_info *board; |
||
61 | |||
62 | static const struct board_info boards[] = { |
||
63 | { |
||
64 | .id = "z1", |
||
65 | .description = "Meraki Z1 Access Point", |
||
66 | .magic = 0x4d495053, |
||
67 | .imagelen = 0x007e0000, |
||
68 | .load_addr = 0x80060000, |
||
69 | .entry = 0x80060000 |
||
70 | }, { |
||
71 | /* terminating entry */ |
||
72 | } |
||
73 | }; |
||
74 | |||
75 | /* |
||
76 | * Message macros |
||
77 | */ |
||
78 | #define ERR(fmt, ...) do { \ |
||
79 | fflush(0); \ |
||
80 | fprintf(stderr, "[%s] *** error: " fmt "\n", \ |
||
81 | progname, ## __VA_ARGS__); \ |
||
82 | } while (0) |
||
83 | |||
84 | #define ERRS(fmt, ...) do { \ |
||
85 | int save = errno; \ |
||
86 | fflush(0); \ |
||
87 | fprintf(stderr, "[%s] *** error: " fmt "\n", \ |
||
88 | progname, ## __VA_ARGS__, strerror(save)); \ |
||
89 | } while (0) |
||
90 | |||
91 | static const struct board_info *find_board(const char *id) |
||
92 | { |
||
93 | const struct board_info *ret; |
||
94 | const struct board_info *board; |
||
95 | |||
96 | ret = NULL; |
||
97 | for (board = boards; board->id != NULL; board++) { |
||
98 | if (strcasecmp(id, board->id) == 0) { |
||
99 | ret = board; |
||
100 | break; |
||
101 | } |
||
102 | } |
||
103 | |||
104 | return ret; |
||
105 | } |
||
106 | |||
107 | static void usage(int status) |
||
108 | { |
||
109 | FILE *stream = (status != EXIT_SUCCESS) ? stderr : stdout; |
||
110 | const struct board_info *board; |
||
111 | |||
112 | fprintf(stream, "Usage: %s [OPTIONS...]\n", progname); |
||
113 | fprintf(stream, |
||
114 | "\n" |
||
115 | "Options:\n" |
||
116 | " -B <board> create image for the board specified with <board>\n" |
||
117 | " -i <file> read kernel image from the file <file>\n" |
||
118 | " -o <file> write output to the file <file>\n" |
||
119 | " -s strip padding from the end of the image\n" |
||
120 | " -h show this screen\n" |
||
121 | ); |
||
122 | |||
123 | fprintf(stream, "\nBoards:\n"); |
||
124 | for (board = boards; board->id != NULL; board++) |
||
125 | fprintf(stream, " %-16s%s\n", board->id, board->description); |
||
126 | |||
127 | exit(status); |
||
128 | } |
||
129 | |||
130 | static void writel(unsigned char *buf, size_t offset, uint32_t value) |
||
131 | { |
||
132 | value = htonl(value); |
||
133 | memcpy(buf + offset, &value, sizeof(uint32_t)); |
||
134 | } |
||
135 | |||
136 | static const uint32_t crc32_table[] = { |
||
137 | 0x00000000, 0x77073096, 0xee0e612c, 0x990951ba, |
||
138 | 0x076dc419, 0x706af48f, 0xe963a535, 0x9e6495a3, |
||
139 | 0x0edb8832, 0x79dcb8a4, 0xe0d5e91e, 0x97d2d988, |
||
140 | 0x09b64c2b, 0x7eb17cbd, 0xe7b82d07, 0x90bf1d91, |
||
141 | 0x1db71064, 0x6ab020f2, 0xf3b97148, 0x84be41de, |
||
142 | 0x1adad47d, 0x6ddde4eb, 0xf4d4b551, 0x83d385c7, |
||
143 | 0x136c9856, 0x646ba8c0, 0xfd62f97a, 0x8a65c9ec, |
||
144 | 0x14015c4f, 0x63066cd9, 0xfa0f3d63, 0x8d080df5, |
||
145 | 0x3b6e20c8, 0x4c69105e, 0xd56041e4, 0xa2677172, |
||
146 | 0x3c03e4d1, 0x4b04d447, 0xd20d85fd, 0xa50ab56b, |
||
147 | 0x35b5a8fa, 0x42b2986c, 0xdbbbc9d6, 0xacbcf940, |
||
148 | 0x32d86ce3, 0x45df5c75, 0xdcd60dcf, 0xabd13d59, |
||
149 | 0x26d930ac, 0x51de003a, 0xc8d75180, 0xbfd06116, |
||
150 | 0x21b4f4b5, 0x56b3c423, 0xcfba9599, 0xb8bda50f, |
||
151 | 0x2802b89e, 0x5f058808, 0xc60cd9b2, 0xb10be924, |
||
152 | 0x2f6f7c87, 0x58684c11, 0xc1611dab, 0xb6662d3d, |
||
153 | 0x76dc4190, 0x01db7106, 0x98d220bc, 0xefd5102a, |
||
154 | 0x71b18589, 0x06b6b51f, 0x9fbfe4a5, 0xe8b8d433, |
||
155 | 0x7807c9a2, 0x0f00f934, 0x9609a88e, 0xe10e9818, |
||
156 | 0x7f6a0dbb, 0x086d3d2d, 0x91646c97, 0xe6635c01, |
||
157 | 0x6b6b51f4, 0x1c6c6162, 0x856530d8, 0xf262004e, |
||
158 | 0x6c0695ed, 0x1b01a57b, 0x8208f4c1, 0xf50fc457, |
||
159 | 0x65b0d9c6, 0x12b7e950, 0x8bbeb8ea, 0xfcb9887c, |
||
160 | 0x62dd1ddf, 0x15da2d49, 0x8cd37cf3, 0xfbd44c65, |
||
161 | 0x4db26158, 0x3ab551ce, 0xa3bc0074, 0xd4bb30e2, |
||
162 | 0x4adfa541, 0x3dd895d7, 0xa4d1c46d, 0xd3d6f4fb, |
||
163 | 0x4369e96a, 0x346ed9fc, 0xad678846, 0xda60b8d0, |
||
164 | 0x44042d73, 0x33031de5, 0xaa0a4c5f, 0xdd0d7cc9, |
||
165 | 0x5005713c, 0x270241aa, 0xbe0b1010, 0xc90c2086, |
||
166 | 0x5768b525, 0x206f85b3, 0xb966d409, 0xce61e49f, |
||
167 | 0x5edef90e, 0x29d9c998, 0xb0d09822, 0xc7d7a8b4, |
||
168 | 0x59b33d17, 0x2eb40d81, 0xb7bd5c3b, 0xc0ba6cad, |
||
169 | 0xedb88320, 0x9abfb3b6, 0x03b6e20c, 0x74b1d29a, |
||
170 | 0xead54739, 0x9dd277af, 0x04db2615, 0x73dc1683, |
||
171 | 0xe3630b12, 0x94643b84, 0x0d6d6a3e, 0x7a6a5aa8, |
||
172 | 0xe40ecf0b, 0x9309ff9d, 0x0a00ae27, 0x7d079eb1, |
||
173 | 0xf00f9344, 0x8708a3d2, 0x1e01f268, 0x6906c2fe, |
||
174 | 0xf762575d, 0x806567cb, 0x196c3671, 0x6e6b06e7, |
||
175 | 0xfed41b76, 0x89d32be0, 0x10da7a5a, 0x67dd4acc, |
||
176 | 0xf9b9df6f, 0x8ebeeff9, 0x17b7be43, 0x60b08ed5, |
||
177 | 0xd6d6a3e8, 0xa1d1937e, 0x38d8c2c4, 0x4fdff252, |
||
178 | 0xd1bb67f1, 0xa6bc5767, 0x3fb506dd, 0x48b2364b, |
||
179 | 0xd80d2bda, 0xaf0a1b4c, 0x36034af6, 0x41047a60, |
||
180 | 0xdf60efc3, 0xa867df55, 0x316e8eef, 0x4669be79, |
||
181 | 0xcb61b38c, 0xbc66831a, 0x256fd2a0, 0x5268e236, |
||
182 | 0xcc0c7795, 0xbb0b4703, 0x220216b9, 0x5505262f, |
||
183 | 0xc5ba3bbe, 0xb2bd0b28, 0x2bb45a92, 0x5cb36a04, |
||
184 | 0xc2d7ffa7, 0xb5d0cf31, 0x2cd99e8b, 0x5bdeae1d, |
||
185 | 0x9b64c2b0, 0xec63f226, 0x756aa39c, 0x026d930a, |
||
186 | 0x9c0906a9, 0xeb0e363f, 0x72076785, 0x05005713, |
||
187 | 0x95bf4a82, 0xe2b87a14, 0x7bb12bae, 0x0cb61b38, |
||
188 | 0x92d28e9b, 0xe5d5be0d, 0x7cdcefb7, 0x0bdbdf21, |
||
189 | 0x86d3d2d4, 0xf1d4e242, 0x68ddb3f8, 0x1fda836e, |
||
190 | 0x81be16cd, 0xf6b9265b, 0x6fb077e1, 0x18b74777, |
||
191 | 0x88085ae6, 0xff0f6a70, 0x66063bca, 0x11010b5c, |
||
192 | 0x8f659eff, 0xf862ae69, 0x616bffd3, 0x166ccf45, |
||
193 | 0xa00ae278, 0xd70dd2ee, 0x4e048354, 0x3903b3c2, |
||
194 | 0xa7672661, 0xd06016f7, 0x4969474d, 0x3e6e77db, |
||
195 | 0xaed16a4a, 0xd9d65adc, 0x40df0b66, 0x37d83bf0, |
||
196 | 0xa9bcae53, 0xdebb9ec5, 0x47b2cf7f, 0x30b5ffe9, |
||
197 | 0xbdbdf21c, 0xcabac28a, 0x53b39330, 0x24b4a3a6, |
||
198 | 0xbad03605, 0xcdd70693, 0x54de5729, 0x23d967bf, |
||
199 | 0xb3667a2e, 0xc4614ab8, 0x5d681b02, 0x2a6f2b94, |
||
200 | 0xb40bbe37, 0xc30c8ea1, 0x5a05df1b, 0x2d02ef8d, |
||
201 | }; |
||
202 | |||
203 | static inline uint32_t crc32_accumulate_8(const uint32_t crc, const uint8_t ch) |
||
204 | { |
||
205 | return crc32_table[(crc ^ ch) & 0xff] ^ (crc >> 8); |
||
206 | } |
||
207 | |||
208 | static void crc32_csum(uint8_t *buf, const size_t len) |
||
209 | { |
||
210 | uint32_t crc; |
||
211 | size_t i; |
||
212 | |||
213 | crc = ~0; |
||
214 | for (i = 0; i < len; i += 4) { |
||
215 | crc = crc32_accumulate_8(crc, buf[i + 3]); |
||
216 | crc = crc32_accumulate_8(crc, buf[i + 2]); |
||
217 | crc = crc32_accumulate_8(crc, buf[i + 1]); |
||
218 | crc = crc32_accumulate_8(crc, buf[i]); |
||
219 | } |
||
220 | crc = ~crc; |
||
221 | |||
222 | writel(buf, HDR_OFF_CHECKSUM, crc); |
||
223 | } |
||
224 | |||
225 | |||
226 | static int meraki_build_hdr(const struct board_info *board, const size_t klen, |
||
227 | FILE *out, FILE *in) |
||
228 | { |
||
229 | unsigned char *kernel; |
||
230 | unsigned char *buf; |
||
231 | size_t buflen; |
||
232 | size_t kspace; |
||
233 | |||
234 | size_t rc; |
||
235 | buflen = board->imagelen; |
||
236 | kspace = buflen - HDR_LENGTH; |
||
237 | |||
238 | if (klen > kspace) { |
||
239 | ERR("kernel file is too big - max size: 0x%08lX\n", kspace); |
||
240 | return EXIT_FAILURE; |
||
241 | } |
||
242 | |||
243 | /* If requested, resize buffer to remove padding */ |
||
244 | if (strip_padding) |
||
245 | buflen = klen + HDR_LENGTH; |
||
246 | |||
247 | /* Allocate and initialize buffer for final image */ |
||
248 | buf = malloc(buflen); |
||
249 | if (buf == NULL) { |
||
250 | ERRS("no memory for buffer: %s\n"); |
||
251 | return EXIT_FAILURE; |
||
252 | } |
||
253 | memset(buf, PADDING_BYTE, buflen); |
||
254 | |||
255 | /* Load kernel */ |
||
256 | kernel = buf + HDR_LENGTH; |
||
257 | fread(kernel, klen, 1, in); |
||
258 | |||
259 | /* Write magic values and filler */ |
||
260 | writel(buf, HDR_OFF_MAGIC1, board->magic); |
||
261 | writel(buf, HDR_OFF_FILLER0, 0); |
||
262 | writel(buf, HDR_OFF_FILLER1, 0); |
||
263 | writel(buf, HDR_OFF_FILLER2, 0); |
||
264 | |||
265 | /* Write load and kernel entry point address */ |
||
266 | writel(buf, HDR_OFF_LOAD_ADDR, board->load_addr); |
||
267 | writel(buf, HDR_OFF_ENTRY, board->entry); |
||
268 | |||
269 | /* Write header and image length */ |
||
270 | writel(buf, HDR_OFF_IMAGELEN, klen); |
||
271 | |||
272 | /* this gets replaced later, after the checksum has been calculated */ |
||
273 | writel(buf, HDR_OFF_CHECKSUM, 0); |
||
274 | |||
275 | /* Write checksum */ |
||
276 | crc32_csum(buf, klen + HDR_LENGTH); |
||
277 | |||
278 | rc = fwrite(buf, buflen, 1, out); |
||
279 | |||
280 | free(buf); |
||
281 | |||
282 | return rc == 1 ? EXIT_SUCCESS : EXIT_FAILURE; |
||
283 | } |
||
284 | |||
285 | int main(int argc, char *argv[]) |
||
286 | { |
||
287 | int ret = EXIT_FAILURE; |
||
288 | char *ofname = NULL, *ifname = NULL; |
||
289 | FILE *out, *in; |
||
290 | size_t klen; |
||
291 | |||
292 | progname = basename(argv[0]); |
||
293 | |||
294 | while (1) { |
||
295 | int c; |
||
296 | |||
297 | c = getopt(argc, argv, "B:i:o:sh"); |
||
298 | if (c == -1) |
||
299 | break; |
||
300 | |||
301 | switch (c) { |
||
302 | case 'B': |
||
303 | board_id = optarg; |
||
304 | break; |
||
305 | case 'i': |
||
306 | ifname = optarg; |
||
307 | break; |
||
308 | case 'o': |
||
309 | ofname = optarg; |
||
310 | break; |
||
311 | case 's': |
||
312 | strip_padding = true; |
||
313 | break; |
||
314 | case 'h': |
||
315 | usage(EXIT_SUCCESS); |
||
316 | break; |
||
317 | default: |
||
318 | usage(EXIT_FAILURE); |
||
319 | break; |
||
320 | } |
||
321 | } |
||
322 | |||
323 | if (board_id == NULL) { |
||
324 | ERR("no board specified"); |
||
325 | goto err; |
||
326 | } |
||
327 | |||
328 | board = find_board(board_id); |
||
329 | if (board == NULL) { |
||
330 | ERR("unknown board \"%s\"", board_id); |
||
331 | goto err; |
||
332 | } |
||
333 | |||
334 | if (ifname == NULL) { |
||
335 | ERR("no input file specified"); |
||
336 | goto err; |
||
337 | } |
||
338 | |||
339 | if (ofname == NULL) { |
||
340 | ERR("no output file specified"); |
||
341 | goto err; |
||
342 | } |
||
343 | |||
344 | in = fopen(ifname, "r"); |
||
345 | if (in == NULL) { |
||
346 | ERRS("could not open \"%s\" for reading: %s", ifname); |
||
347 | goto err; |
||
348 | } |
||
349 | |||
350 | /* Get kernel length */ |
||
351 | fseek(in, 0, SEEK_END); |
||
352 | klen = ftell(in); |
||
353 | rewind(in); |
||
354 | |||
355 | out = fopen(ofname, "w"); |
||
356 | if (out == NULL) { |
||
357 | ERRS("could not open \"%s\" for writing: %s", ofname); |
||
358 | goto err_close_in; |
||
359 | } |
||
360 | |||
361 | ret = meraki_build_hdr(board, klen, out, in); |
||
362 | fclose(out); |
||
363 | |||
364 | err_close_in: |
||
365 | fclose(in); |
||
366 | |||
367 | err: |
||
368 | return ret; |
||
369 | } |