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4 office 1 /* vi: set sw=4 ts=4: */
2 /*
3 * Copyright (C) 2008, Alpha Networks, Inc.
4 * Created by David Hsieh <david_hsieh@alphanetworks.com>
5 * All right reserved.
6 *
7 * (SEA)ttle i(MA)ge is the image which used in project seattle.
8 *
9 * Redistribution and use in source and binary forms, with or
10 * without modification, are permitted provided that the following
11 * conditions are met:
12 *
13 * 1. Redistributions of source code must retain the above
14 * copyright notice, this list of conditions and the following
15 * disclaimer.
16 *
17 * 2. Redistributions in binary form must reproduce the above
18 * copyright notice, this list of conditions and the following
19 * disclaimer in the documentation and/or other materials
20 * provided with the distribution.
21 *
22 * 3. The name of the author may not be used to endorse or promote
23 * products derived from this software without specific prior
24 * written permission.
25 *
26 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY
27 * EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO,
28 * THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A
29 * PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR
30 * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
31 * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED
32 * TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
33 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
34 * ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
35 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING
36 * IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF
37 * THE POSSIBILITY OF SUCH DAMAGE.
38 *
39 */
40  
41 #include <stdio.h>
42 #include <stdint.h>
43 #include <stdlib.h>
44 #include <stdarg.h>
45 #include <sys/types.h>
46 #include <sys/stat.h>
47 #include <unistd.h>
48 #include <string.h>
49 #include <arpa/inet.h>
50  
51 #include "md5.h"
52 #include "seama.h"
53  
54 #define PROGNAME "seama"
55 #define VERSION "0.20"
56 #define MAX_SEAMA_META_SIZE 1024
57 #define MAX_META 128
58 #define MAX_IMAGE 128
59  
60 extern int optind;
61 extern char * optarg;
62  
63 static int o_verbose = 0; /* verbose mode. */
64 static char * o_dump = NULL; /* Seama file to dump. */
65 static char * o_seal = NULL; /* Seal the input images when file name exist. */
66 static char * o_extract = NULL; /* Extract the seama file. */
67 static char * o_images[MAX_IMAGE];/* The image files to pack or seal */
68 static int o_isize = 0; /* number of images */
69 static char * o_meta[MAX_META]; /* meta data array */
70 static int o_msize = 0; /* size of meta array */
71  
72 static void verbose(const char * format, ...)
73 {
74 va_list marker;
75 if (o_verbose)
76 {
77 va_start(marker, format);
78 vfprintf(stdout, format, marker);
79 va_end(marker);
80 }
81 }
82  
83 static void cleanup_exit(int exit_code)
84 {
85 verbose("%s: exit with code %d\n", PROGNAME, exit_code);
86 exit(exit_code);
87 }
88  
89 static void show_usage(int exit_code)
90 {
91 printf( PROGNAME " version " VERSION "\n"
92 "usage: " PROGNAME " [OPTIONS]\n"
93 " -h show this help message.\n"
94 " -v verbose mode.\n"
95 " -m {META data} META data.\n"
96 " -d {file} dump the info of the seama file.\n"
97 " -i {input file} image file name.\n"
98 " -s {file} Seal the images to the seama file.\n"
99 " -x {seama file} Extract the seama file.\n"
100 "\n"
101 " SEAMA can pack the input file (with -i) into a seama file.\n"
102 " ex: seama -i target.file\n"
103 " SEAMA can also seal multiple seama files into a single seama file.\n"
104 " ex: seama -s final.file -i taget1.seama -i target2.seama\n"
105 " To extract the raw image from SEAMA, you need to specify the meta.\n"
106 " The first image match the specified meta will be extract to\n"
107 " the output file which was specified with '-x'.\n"
108 " ex: seama -x output -i seama.image -m file=sealpac\n"
109 );
110 cleanup_exit(exit_code);
111 }
112  
113 static int parse_args(int argc, char * argv[])
114 {
115 int opt;
116  
117 while ((opt = getopt(argc, argv, "hvd:s:i:m:x:")) > 0)
118 {
119 switch (opt)
120 {
121 default: show_usage(-1); break;
122 case 'h': show_usage(0); break;
123 case 'v': o_verbose++; break;
124 case 'd': o_dump = optarg; break;
125 case 's': o_seal = optarg; break;
126 case 'x': o_extract = optarg; break;
127 case 'i':
128 if (o_isize < MAX_IMAGE) o_images[o_isize++] = optarg;
129 else printf("Exceed the maximum acceptable image files.!\n");
130 break;
131 case 'm':
132 if (o_msize < MAX_META) o_meta[o_msize++] = optarg;
133 else printf("Exceed the maximum acceptable META data.!\n");
134 break;
135 }
136 }
137 return 0;
138 }
139  
140 /*******************************************************************/
141  
142 static size_t calculate_digest(FILE * fh, size_t size, uint8_t * digest)
143 {
144 MD5_CTX ctx;
145 size_t bytes_left, bytes_read, i;
146 uint8_t buf[MAX_SEAMA_META_SIZE];
147  
148 bytes_left = size ? size : sizeof(buf);
149 bytes_read = 0;
150  
151 MD5_Init(&ctx);
152 while (!feof(fh) && !ferror(fh) && bytes_left > 0)
153 {
154 i = bytes_left < sizeof(buf) ? bytes_left : sizeof(buf);
155 i = fread(buf, sizeof(char), i, fh);
156 if (i > 0)
157 {
158 MD5_Update(&ctx, buf, i);
159 bytes_read += i;
160 }
161 if (size) bytes_left -= i;
162 }
163 MD5_Final(digest, &ctx);
164 return bytes_read;
165 }
166  
167 #define READ_BUFF_SIZE 8*1024
168 static size_t copy_file(FILE * to, FILE * from)
169 {
170 size_t i, fsize = 0;
171 uint8_t buf[READ_BUFF_SIZE];
172  
173 while (!feof(from) && !ferror(from))
174 {
175 i = fread(buf, sizeof(uint8_t), READ_BUFF_SIZE, from);
176 if (i > 0)
177 {
178 fsize += i;
179 fwrite(buf, sizeof(uint8_t), i, to);
180 }
181 }
182 return fsize;
183 }
184  
185 static int verify_seama(const char * fname, int msg)
186 {
187 FILE * fh = NULL;
188 struct stat st;
189 seamahdr_t shdr;
190 uint8_t checksum[16];
191 uint8_t digest[16];
192 uint8_t buf[MAX_SEAMA_META_SIZE];
193 size_t msize, isize, i;
194 int ret = -1;
195  
196 #define ERRBREAK(fmt, args...) { if (msg) printf(fmt, ##args); break; }
197  
198 do
199 {
200 if (stat(fname, &st) < 0) ERRBREAK("Unable to get the info of '%s'\n",fname);
201 if ((fh = fopen(fname, "r+"))==NULL) ERRBREAK("Unable to open '%s' for reading!\n",fname);
202  
203 /* Dump SEAMA header */
204 if (msg) printf("FILE - %s (%d bytes)\n", fname, (int)st.st_size);
205  
206 /* SEAMA */
207 while (!feof(fh) && !ferror(fh))
208 {
209 /* read header */
210 if (fread(&shdr, sizeof(shdr), 1, fh) != 1) break;
211  
212 /* Check the magic number */
213 if (shdr.magic != htonl(SEAMA_MAGIC)) ERRBREAK("Invalid SEAMA magic. Probably no more SEAMA!\n");
214  
215 /* Get the size */
216 isize = ntohl(shdr.size);
217 msize = ntohs(shdr.metasize);
218  
219 /* The checksum exist only if size is greater than zero. */
220 if (isize > 0)
221 {
222 if (fread(checksum, sizeof(checksum), 1, fh) != 1)
223 ERRBREAK("Error reading checksum !\n");
224 }
225  
226 /* Check the META size. */
227 if (msize > sizeof(buf)) ERRBREAK("META data in SEAMA header is too large!\n");
228  
229 /* Read META data. */
230 if (fread(buf, sizeof(char), msize, fh) != msize)
231 ERRBREAK("Unable to read SEAMA META data!\n");
232  
233 /* dump header */
234 if (msg)
235 {
236 printf("SEAMA ==========================================\n");
237 printf(" magic : %08x\n", ntohl(shdr.magic));
238 printf(" meta size : %zu bytes\n", msize);
239 for (i=0; i<msize; i+=(strlen((const char *)&buf[i])+1))
240 printf(" meta data : %s\n", &buf[i]);
241 printf(" image size : %zu bytes\n", isize);
242 }
243  
244 /* verify checksum */
245 if (isize > 0)
246 {
247 if (msg)
248 {
249 printf(" checksum : ");
250 for (i=0; i<16; i++) printf("%02X", checksum[i]);
251 printf("\n");
252 }
253  
254 /* Calculate the checksum */
255 calculate_digest(fh, isize, digest);
256 if (msg)
257 {
258 printf(" digest : ");
259 for (i=0; i<16; i++) printf("%02X", digest[i]);
260 printf("\n");
261 }
262  
263 if (memcmp(checksum, digest, 16)!=0) ERRBREAK("!!ERROR!! checksum error !!\n");
264 ret = 0;
265 }
266 }
267 if (msg) printf("================================================\n");
268 } while (0);
269 if (fh) fclose(fh);
270 return ret;
271 }
272  
273 static size_t write_seama_header(FILE * fh, char * meta[], size_t msize, size_t size)
274 {
275 seamahdr_t shdr;
276 size_t i;
277 uint16_t metasize = 0;
278  
279 /* Calculate the META size */
280 for (i=0; i<msize; i++) metasize += (strlen(meta[i]) + 1);
281 //+++ let meta data end on 4 alignment by siyou. 2010/3/1 03:58pm
282 metasize = ((metasize+3)/4)*4;
283 verbose("SEAMA META : %d bytes\n", metasize);
284  
285 /* Fill up the header, all the data endian should be network byte order. */
286 shdr.magic = htonl(SEAMA_MAGIC);
287 shdr.reserved = 0;
288 shdr.metasize = htons(metasize);
289 shdr.size = htonl(size);
290  
291 /* Write the header */
292 return fwrite(&shdr, sizeof(seamahdr_t), 1, fh);
293 }
294  
295 static size_t write_checksum(FILE * fh, uint8_t * checksum)
296 {
297 return fwrite(checksum, sizeof(uint8_t), 16, fh);
298 }
299  
300 static size_t write_meta_data(FILE * fh, char * meta[], size_t size)
301 {
302 size_t i,j;
303 size_t ret = 0;
304  
305 for (i=0; i<size; i++)
306 {
307 verbose("SEAMA META data : %s\n", meta[i]);
308 j = fwrite(meta[i], sizeof(char), strlen(meta[i])+1, fh);
309 if (j != strlen(meta[i])+1) return 0;
310 ret += j;
311 }
312 //+++ let meta data end on 4 alignment by siyou. 2010/3/1 03:58pm
313 j = ((ret+3)/4)*4;
314 for ( ; ret < j; ret++)
315 fwrite("", sizeof(char), 1, fh);
316  
317 return ret;
318 }
319  
320 /*******************************************************************/
321  
322 static void dump_seama(const char * fname)
323 {
324 verify_seama(fname, 1);
325 }
326  
327 static void seal_files(const char * file)
328 {
329 FILE * fh;
330 FILE * ifh;
331 size_t i;
332  
333 /* Each image should be seama. */
334 for (i = 0; i < o_isize; i++)
335 {
336 if (verify_seama(o_images[i], 0) < 0)
337 {
338 printf("'%s' is not a seama file !\n",o_images[i]);
339 return;
340 }
341 }
342  
343 /* Open file for write */
344 fh = fopen(file, "w+");
345 if (fh)
346 {
347 /* Write the header. */
348 write_seama_header(fh, o_meta, o_msize, 0);
349 write_meta_data(fh, o_meta, o_msize);
350  
351 /* Write image files */
352 for (i=0; i<o_isize; i++)
353 {
354 ifh = fopen(o_images[i], "r+");
355 if (ifh)
356 {
357 copy_file(fh, ifh);
358 fclose(ifh);
359 }
360 }
361  
362 fclose(fh);
363 }
364 }
365  
366 static void pack_files(void)
367 {
368 FILE * fh;
369 FILE * ifh;
370 size_t i, fsize;
371 char filename[512];
372 uint8_t digest[16];
373  
374 for (i=0; i<o_isize; i++)
375 {
376 /* Open the input file. */
377 ifh = fopen(o_images[i], "r+");
378 if (ifh)
379 {
380 fsize = calculate_digest(ifh, 0, digest);
381 verbose("file size (%s) : %d\n", o_images[i], fsize);
382 rewind(ifh);
383  
384 /* Open the output file. */
385 sprintf(filename, "%s.seama", o_images[i]);
386 fh = fopen(filename, "w+");
387 if (fh)
388 {
389 write_seama_header(fh, o_meta, o_msize, fsize);
390 write_checksum(fh, digest);
391 write_meta_data(fh, o_meta, o_msize);
392 copy_file(fh, ifh);
393 fclose(fh);
394 }
395 fclose(ifh);
396 }
397 else
398 {
399 printf("Unable to open image file '%s'\n",o_images[i]);
400 }
401 }
402 }
403  
404 /**************************************************************************/
405  
406 static int match_meta(const char * meta, size_t size)
407 {
408 size_t i, j;
409 int match;
410  
411 for (i = 0; i < o_msize; i++)
412 {
413 for (match = 0, j = 0; j < size; j += (strlen(&meta[j])+1))
414 if (strcmp(&meta[j], o_meta[i])==0) { match++; break; }
415 if (!match) return 0;
416 }
417 return 1;
418 }
419  
420  
421 static void extract_file(const char * output)
422 {
423 FILE * ifh = NULL;
424 FILE * ofh = NULL;
425 size_t msize, isize, i, m;
426 seamahdr_t shdr;
427 uint8_t buf[MAX_SEAMA_META_SIZE];
428 int done = 0;
429  
430 /* We need meta for searching the target image. */
431 if (o_msize == 0)
432 {
433 printf("SEAMA: need meta for searching image.\n");
434 return;
435 }
436  
437 /* Walk through each input file */
438 for (i = 0; i < o_isize; i++)
439 {
440 /* verify the input file */
441 if (verify_seama(o_images[i], 0) < 0)
442 {
443 printf("SEAMA: '%s' is not a seama file !\n", o_images[i]);
444 continue;
445 }
446 /* open the input file */
447 ifh = fopen(o_images[i], "r");
448 if (!ifh) continue;
449 /* read file */
450 while (!feof(ifh) && !ferror(ifh))
451 {
452 /* read header */
453 fread(&shdr, sizeof(shdr), 1, ifh);
454 if (shdr.magic != htonl(SEAMA_MAGIC)) break;
455 /* Get the size */
456 isize = ntohl(shdr.size);
457 msize = ntohs(shdr.metasize);
458 if (isize == 0)
459 {
460 while (msize > 0)
461 {
462 m = fread(buf, sizeof(char), (msize < MAX_SEAMA_META_SIZE) ? msize : MAX_SEAMA_META_SIZE, ifh);
463 if (m <= 0) break;
464 msize -= m;
465 }
466 continue;
467 }
468 /* read checksum */
469 fread(buf, sizeof(char), 16, ifh);
470 if (msize > 0)
471 {
472 /* read META */
473 fread(buf, sizeof(char), msize, ifh);
474 if (match_meta((const char *)buf, msize))
475 {
476 printf("SEAMA: found image @ '%s', image size: %zu\n", o_images[i], isize);
477 /* open output file */
478 ofh = fopen(output, "w");
479 if (!ofh) printf("SEAMA: unable to open '%s' for writting.\n",output);
480 else
481 {
482 while (isize > 0)
483 {
484 m = fread(buf, sizeof(char), (isize < MAX_SEAMA_META_SIZE) ? isize : MAX_SEAMA_META_SIZE, ifh);
485 if (m <= 0) break;
486 fwrite(buf, sizeof(char), m, ofh);
487 isize -= m;
488 }
489 fclose(ofh);
490 }
491 done++;
492 break;
493 }
494 }
495 while (isize > 0)
496 {
497 m = fread(buf, sizeof(char), (isize < MAX_SEAMA_META_SIZE) ? isize : MAX_SEAMA_META_SIZE, ifh);
498 if (m <= 0) break;
499 isize -= m;
500 }
501 }
502 /* close the file. */
503 fclose(ifh);
504 if (done) break;
505 }
506 return;
507 }
508  
509 /*******************************************************************/
510 #ifdef RGBIN_BOX
511 int seama_main(int argc, char * argv[], char * env[])
512 #else
513 int main(int argc, char * argv[], char * env[])
514 #endif
515 {
516 verbose("SEAMA version " VERSION "\n");
517  
518 /* parse the arguments */
519 if (parse_args(argc, argv) < 0) show_usage(9);
520  
521 /* Do the works */
522 if (o_dump) dump_seama(o_dump);
523 else if (o_seal) seal_files(o_seal);
524 else if (o_extract) extract_file(o_extract);
525 else pack_files();
526  
527 cleanup_exit(0);
528 return 0;
529 }