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[proxmark3-svn] / client / reveng / cli.c
1 /* cli.c
2 * Greg Cook, 27/Jun/2016
3 */
4
5 /* CRC RevEng: arbitrary-precision CRC calculator and algorithm finder
6 * Copyright (C) 2010, 2011, 2012, 2013, 2014, 2015, 2016 Gregory Cook
7 *
8 * This file is part of CRC RevEng.
9 *
10 * CRC RevEng is free software: you can redistribute it and/or modify
11 * it under the terms of the GNU General Public License as published by
12 * the Free Software Foundation, either version 3 of the License, or
13 * (at your option) any later version.
14 *
15 * CRC RevEng is distributed in the hope that it will be useful,
16 * but WITHOUT ANY WARRANTY; without even the implied warranty of
17 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
18 * GNU General Public License for more details.
19 *
20 * You should have received a copy of the GNU General Public License
21 * along with CRC RevEng. If not, see <https://www.gnu.org/licenses/>.
22 */
23
24 /* 2016-06-27: -P sets width like -k
25 * 2015-04-03: added -z
26 * 2013-09-16: do not search with -M
27 * 2013-06-11: uprog() suppresses first progress report
28 * 2013-04-22: uprog() prints poly same as mtostr()
29 * 2013-02-07: added -q, uprog(), removed -W, R_ODDLY
30 * 2012-05-24: -D dumps parameters of all models
31 * 2012-03-03: added code to test sort order of model table
32 * 2012-02-20: set stdin to binary (MinGW). offer -D if preset unknown.
33 * 2011-09-06: -s reads arguments once. stdin not closed.
34 * 2011-09-06: fixed bad argument-freeing loops.
35 * 2011-08-27: validates BMP_C()
36 * 2011-08-26: validates BMPBIT and BMPSUB
37 * 2011-08-25: fixed Init/Xorout reflection logic in -V and -v
38 * 2011-01-17: fixed ANSI C warnings
39 * 2011-01-15: added NOFORCE
40 * 2011-01-14: added -k, -P
41 * 2011-01-10: reorganised switches, added -V, -X
42 * 2010-12-26: renamed CRC RevEng
43 * 2010-12-18: implemented -c, -C
44 * 2010-12-14: added and implemented -d, -D, fixed -ipx entry
45 * 2010-12-11: implemented -e. first tests
46 * 2010-12-10: finalised option processing. started input validation
47 * 2010-12-07: started cli
48 */
49
50 #include <stdio.h>
51 #include <stdlib.h>
52 #include "getopt.h"
53 #ifdef _WIN32
54 # include <io.h>
55 # include <fcntl.h>
56 # ifndef STDIN_FILENO
57 # define STDIN_FILENO 0
58 # endif /* STDIN_FILENO */
59 #endif /* _WIN32 */
60
61 #include "reveng.h"
62
63 static FILE *oread(const char *);
64 static poly_t rdpoly(const char *, int, int);
65 static void usage(void);
66
67 static const char *myname = "reveng"; /* name of our program */
68
69 int reveng_main(int argc, char *argv[]) {
70 /* Command-line interface for CRC RevEng.
71 * Process options and switches in the argument list and
72 * run the required function.
73 */
74
75 /* default values */
76 model_t model = {
77 PZERO, /* no CRC polynomial, user must specify */
78 PZERO, /* Init = 0 */
79 P_BE, /* RefIn = false, RefOut = false, plus P_RTJUST setting in reveng.h */
80 PZERO, /* XorOut = 0 */
81 PZERO, /* check value unused */
82 NULL /* no model name */
83 };
84 int ibperhx = 8, obperhx = 8;
85 int rflags = 0, uflags = 0; /* search and UI flags */
86
87 unsigned long width = 0UL;
88 int c, mode = 0, args, psets, pass;
89 poly_t apoly, crc, qpoly = PZERO, *apolys, *pptr = NULL, *qptr = NULL;
90 model_t pset = model, *candmods, *mptr;
91 char *string;
92
93 myname = argv[0];
94
95 /* stdin must be binary */
96 #ifdef _WIN32
97 _setmode(STDIN_FILENO, _O_BINARY);
98 #endif /* _WIN32 */
99
100 SETBMP();
101
102 pos=0;
103 optind=1;
104 do {
105 c=getopt(argc, argv, "?A:BDFLMP:SVXa:bcdefhi:k:lm:p:q:rstuvw:x:yz");
106 switch(c) {
107 case 'A': /* A: bits per output character */
108 case 'a': /* a: bits per character */
109 if((obperhx = atoi(optarg)) > BMP_BIT) {
110 fprintf(stderr,"%s: argument to -%c must be between 1 and %d\n", myname, c, BMP_BIT);
111 return 0;
112 //exit(EXIT_FAILURE);
113 }
114 if(c == 'a') ibperhx = obperhx;
115 break;
116 case 'b': /* b big-endian (RefIn = false, RefOut = false ) */
117 model.flags &= ~P_REFIN;
118 rflags |= R_HAVERI;
119 /* fall through: */
120 case 'B': /* B big-endian output (RefOut = false) */
121 model.flags &= ~P_REFOUT;
122 rflags |= R_HAVERO;
123 mnovel(&model);
124 /* fall through: */
125 case 'r': /* r right-justified */
126 model.flags |= P_RTJUST;
127 break;
128 case 'c': /* c calculate CRC */
129 case 'D': /* D list primary model names */
130 case 'd': /* d dump CRC model */
131 case 'e': /* e echo arguments */
132 case 's': /* s search for algorithm */
133 case 'v': /* v calculate reversed CRC */
134 if(mode) {
135 fprintf(stderr,"%s: more than one mode switch specified. Use %s -h for help.\n", myname, myname);
136 return 0;
137 //exit(EXIT_FAILURE);
138 }
139 mode = c;
140 break;
141 case 'F': /* F force search */
142 #ifndef NOFORCE
143 uflags |= C_FORCE;
144 #endif
145 break;
146 case 'f': /* f arguments are filenames */
147 uflags |= C_INFILE;
148 break;
149 case 'h': /* h get help / usage */
150 case 'u': /* u get help / usage */
151 case '?': /* ? get help / usage */
152 default:
153 usage();
154 return 0;
155 //exit(EXIT_FAILURE);
156 break;
157 case 'i': /* i: Init value */
158 pptr = &model.init;
159 rflags |= R_HAVEI;
160 goto ipqx;
161 case 'P': /* P: reversed polynomial */
162 case 'k': /* k: polynomial in Koopman notation */
163 pfree(&model.spoly);
164 model.spoly = strtop(optarg, 0, 4);
165 pkchop(&model.spoly);
166 width = plen(model.spoly);
167 rflags |= R_HAVEP;
168 if(c == 'P')
169 prcp(&model.spoly);
170 mnovel(&model);
171 break;
172 case 'l': /* l little-endian input and output */
173 model.flags |= P_REFIN;
174 rflags |= R_HAVERI;
175 /* fall through: */
176 case 'L': /* L little-endian output */
177 model.flags |= P_REFOUT;
178 rflags |= R_HAVERO;
179 mnovel(&model);
180 /* fall through: */
181 case 't': /* t left-justified */
182 model.flags &= ~P_RTJUST;
183 break;
184 case 'm': /* m: select preset CRC model */
185 if(!(c = mbynam(&model, optarg))) {
186 fprintf(stderr,"%s: preset model '%s' not found. Use %s -D to list presets.\n", myname, optarg, myname);
187 return 0;
188 //exit(EXIT_FAILURE);
189 }
190 if(c < 0){
191 uerror("no preset models available");
192 return 0;
193 }
194 /* must set width so that parameter to -ipx is not zeroed */
195 width = plen(model.spoly);
196 rflags |= R_HAVEP | R_HAVEI | R_HAVERI | R_HAVERO | R_HAVEX;
197 break;
198 case 'M': /* M non-augmenting algorithm */
199 model.flags &= ~P_MULXN;
200 break;
201 case 'p': /* p: polynomial */
202 pptr = &model.spoly;
203 rflags &= ~R_HAVEQ;
204 rflags |= R_HAVEP;
205 ipqx:
206 pfree(pptr);
207 *pptr = strtop(optarg, 0, 4);
208 pright(pptr, width);
209 mnovel(&model);
210 break;
211 case 'q': /* q: range end polynomial */
212 pptr = &qpoly;
213 rflags &= ~R_HAVEP;
214 rflags |= R_HAVEQ;
215 goto ipqx;
216 case 'S': /* s space between output characters */
217 model.flags |= P_SPACE;
218 break;
219 case 'V': /* v reverse algorithm */
220 /* Distinct from the -v switch as the
221 * user will have to reverse his or her
222 * own arguments. The user cannot dump
223 * the model generated by -v either.
224 */
225 mrev(&model);
226 break;
227 case 'w': /* w: CRC width = order - 1 */
228 /* no validation, WONTFIX */
229 width = (unsigned long) atol(optarg);
230 break;
231 case 'X': /* X print uppercase hex */
232 model.flags |= P_UPPER;
233 break;
234 case 'x': /* x: XorOut value */
235 pptr = &model.xorout;
236 rflags |= R_HAVEX;
237 goto ipqx;
238 case 'y': /* y little-endian byte order in files */
239 model.flags |= P_LTLBYT;
240 break;
241 case 'z': /* z raw binary arguments */
242 model.flags |= P_DIRECT;
243 break;
244 case -1: /* no more options, continue */
245 ;
246 }
247 } while(c != -1);
248
249 /* canonicalise the model, so the one we dump is the one we
250 * calculate with (not with -s, spoly may be blank which will
251 * normalise to zero and clear init and xorout.)
252 */
253 if(mode != 's')
254 mcanon(&model);
255
256 switch(mode) {
257 case 'v': /* v calculate reversed CRC */
258 /* Distinct from the -V switch as this causes
259 * the arguments and output to be reversed as well.
260 */
261 /* reciprocate Poly */
262 prcp(&model.spoly);
263
264 /* mrev() does:
265 * if(refout) prev(init); else prev(xorout);
266 * but here the entire argument polynomial is
267 * reflected, not just the characters, so RefIn
268 * and RefOut are not inverted as with -V.
269 * Consequently Init is the mirror image of the
270 * one resulting from -V, and so we have:
271 */
272 if(~model.flags & P_REFOUT) {
273 prev(&model.init);
274 prev(&model.xorout);
275 }
276
277 /* swap init and xorout */
278 apoly = model.init;
279 model.init = model.xorout;
280 model.xorout = apoly;
281
282 /* fall through: */
283 case 'c': /* c calculate CRC */
284
285 /* validate inputs */
286 /* if(plen(model.spoly) == 0) {
287 * fprintf(stderr,"%s: no polynomial specified for -%c (add -w WIDTH -p POLY)\n", myname, mode);
288 * exit(EXIT_FAILURE);
289 * }
290 */
291
292 /* in the Williams model, xorout is applied after the refout stage.
293 * as refout is part of ptostr(), we reverse xorout here.
294 */
295 if(model.flags & P_REFOUT)
296 prev(&model.xorout);
297
298 for(; optind < argc; ++optind) {
299 if(uflags & C_INFILE)
300 apoly = rdpoly(argv[optind], model.flags, ibperhx);
301 else
302 apoly = strtop(argv[optind], model.flags, ibperhx);
303
304 if(mode == 'v')
305 prev(&apoly);
306
307 crc = pcrc(apoly, model.spoly, model.init, model.xorout, model.flags);
308
309 if(mode == 'v')
310 prev(&crc);
311
312 string = ptostr(crc, model.flags, obperhx);
313 puts(string);
314 free(string);
315 pfree(&crc);
316 pfree(&apoly);
317 }
318 break;
319 case 'D': /* D dump all models */
320 args = mcount();
321 if(!args){
322 uerror("no preset models available");
323 return 0;
324 }
325 for(mode = 0; mode < args; ++mode) {
326 mbynum(&model, mode);
327 mcanon(&model);
328 ufound(&model);
329 }
330 break;
331 case 'd': /* d dump CRC model */
332 /* maybe we don't want to do this:
333 * either attaching names to arbitrary models or forcing to a preset
334 * mmatch(&model, M_OVERWR);
335 */
336 if(~model.flags & P_MULXN){
337 uerror("not a Williams model compliant algorithm");
338 return 0;
339 }
340 string = mtostr(&model);
341 puts(string);
342 free(string);
343 break;
344 case 'e': /* e echo arguments */
345 for(; optind < argc; ++optind) {
346 if(uflags & C_INFILE)
347 apoly = rdpoly(argv[optind], model.flags, ibperhx);
348 else
349 apoly = strtop(argv[optind], model.flags, ibperhx);
350
351 psum(&apoly, model.init, 0UL);
352 string = ptostr(apoly, model.flags, obperhx);
353 puts(string);
354 free(string);
355 pfree(&apoly);
356 }
357 break;
358 case 's': /* s search for algorithm */
359 if(!width){
360 uerror("must specify positive -k or -w before -s");
361 return 0;
362 }
363 if(~model.flags & P_MULXN){
364 uerror("cannot search for non-Williams compliant models");
365 return 0;
366 }
367 praloc(&model.spoly, width);
368 praloc(&model.init, width);
369 praloc(&model.xorout, width);
370 if(!plen(model.spoly))
371 palloc(&model.spoly, width);
372 else
373 width = plen(model.spoly);
374
375 /* special case if qpoly is zero, search to end of range */
376 if(!ptst(qpoly))
377 rflags &= ~R_HAVEQ;
378
379 /* allocate argument array */
380 args = argc - optind;
381 if(!(apolys = malloc(args * sizeof(poly_t)))){
382 uerror("cannot allocate memory for argument list");
383 return 0;
384 }
385
386 for(pptr = apolys; optind < argc; ++optind) {
387 if(uflags & C_INFILE)
388 *pptr++ = rdpoly(argv[optind], model.flags, ibperhx);
389 else
390 *pptr++ = strtop(argv[optind], model.flags, ibperhx);
391 }
392 /* exit value of pptr is used hereafter! */
393
394 /* if endianness not specified, try
395 * little-endian then big-endian.
396 * NB: crossed-endian algorithms will not be
397 * searched.
398 */
399
400 /* scan against preset models */
401 if(~uflags & C_FORCE) {
402 pass = 0;
403 do {
404 psets = mcount();
405 while(psets) {
406 mbynum(&pset, --psets);
407 /* skip if different width, or refin or refout don't match */
408 if(plen(pset.spoly) != width || (model.flags ^ pset.flags) & (P_REFIN | P_REFOUT))
409 continue;
410 /* skip if the preset doesn't match specified parameters */
411 if(rflags & R_HAVEP && pcmp(&model.spoly, &pset.spoly))
412 continue;
413 if(rflags & R_HAVEI && psncmp(&model.init, &pset.init))
414 continue;
415 if(rflags & R_HAVEX && psncmp(&model.xorout, &pset.xorout))
416 continue;
417 apoly = pclone(pset.xorout);
418 if(pset.flags & P_REFOUT)
419 prev(&apoly);
420 for(qptr = apolys; qptr < pptr; ++qptr) {
421 crc = pcrc(*qptr, pset.spoly, pset.init, apoly, 0);
422 if(ptst(crc)) {
423 pfree(&crc);
424 break;
425 } else
426 pfree(&crc);
427 }
428 pfree(&apoly);
429 if(qptr == pptr) {
430 /* the selected model solved all arguments */
431 mcanon(&pset);
432 ufound(&pset);
433 uflags |= C_RESULT;
434 }
435 }
436 mfree(&pset);
437
438 /* toggle refIn/refOut and reflect arguments */
439 if(~rflags & R_HAVERI) {
440 model.flags ^= P_REFIN | P_REFOUT;
441 for(qptr = apolys; qptr < pptr; ++qptr)
442 prevch(qptr, ibperhx);
443 }
444 } while(~rflags & R_HAVERI && ++pass < 2);
445 }
446 if(uflags & C_RESULT) {
447 for(qptr = apolys; qptr < pptr; ++qptr)
448 pfree(qptr);
449 return 1;
450 //exit(EXIT_SUCCESS);
451 }
452 if(!(model.flags & P_REFIN) != !(model.flags & P_REFOUT)){
453 uerror("cannot search for crossed-endian models");
454 return 0;
455 }
456 pass = 0;
457 do {
458 mptr = candmods = reveng(&model, qpoly, rflags, args, apolys);
459 if(mptr && plen(mptr->spoly))
460 uflags |= C_RESULT;
461 while(mptr && plen(mptr->spoly)) {
462 /* results were printed by the callback
463 * string = mtostr(mptr);
464 * puts(string);
465 * free(string);
466 */
467 mfree(mptr++);
468 }
469 free(candmods);
470 if(~rflags & R_HAVERI) {
471 model.flags ^= P_REFIN | P_REFOUT;
472 for(qptr = apolys; qptr < pptr; ++qptr)
473 prevch(qptr, ibperhx);
474 }
475 } while(~rflags & R_HAVERI && ++pass < 2);
476 for(qptr = apolys; qptr < pptr; ++qptr)
477 pfree(qptr);
478 free(apolys);
479 if(~uflags & C_RESULT)
480 uerror("no models found");
481 break;
482 default: /* no mode specified */
483 fprintf(stderr, "%s: no mode switch specified. Use %s -h for help.\n", myname, myname);
484 //exit(EXIT_FAILURE);
485 }
486
487 return 1;
488 //exit(EXIT_SUCCESS);
489 }
490
491 void
492 ufound(const model_t *model) {
493 /* Callback function to report each model found */
494 char *string;
495
496 if(!model) return;
497 /* generated models will be canonical */
498 string = mtostr(model);
499 puts(string);
500 free(string);
501 }
502
503 void
504 uerror(const char *msg) {
505 /* Callback function to report fatal errors */
506 fprintf(stderr, "%s: %s\n", myname, msg);
507 return;
508 //exit(EXIT_FAILURE);
509 }
510
511 void
512 uprog(const poly_t gpoly, int flags, unsigned long seq) {
513 /* Callback function to report search progress */
514 char *string;
515
516 /* Suppress first report in CLI */
517 if(!seq)
518 return;
519 string = ptostr(gpoly, P_RTJUST, 4);
520 fprintf(stderr, "%s: searching: width=%ld poly=0x%s refin=%s refout=%s\n",
521 myname, plen(gpoly), string,
522 (flags & P_REFIN ? "true" : "false"),
523 (flags & P_REFOUT ? "true" : "false")
524 );
525 free(string);
526 }
527
528 static poly_t
529 rdpoly(const char *name, int flags, int bperhx) {
530 /* read poly from file in chunks and report errors */
531
532 poly_t apoly = PZERO, chunk = PZERO;
533 FILE *input;
534
535 input = oread(name);
536 while(!feof(input) && !ferror(input)) {
537 chunk = filtop(input, BUFFER, flags, bperhx);
538 psum(&apoly, chunk, plen(apoly));
539 pfree(&chunk);
540 }
541 if(ferror(input)) {
542 fprintf(stderr,"%s: error condition on file '%s'\n", myname, name);
543 exit(EXIT_FAILURE);
544 }
545 /* close file unless stdin */
546 if(input == stdin)
547 /* reset EOF condition */
548 clearerr(input);
549 else if(fclose(input)) {
550 fprintf(stderr,"%s: error closing file '%s'\n", myname, name);
551 exit(EXIT_FAILURE);
552 }
553 return(apoly);
554 }
555
556 static FILE *
557 oread(const char *name) {
558 /* open file for reading and report errors */
559 FILE *handle;
560
561 /* recognise special name '-' as standard input */
562 if(*name == '-' && name[1] == '\0')
563 return(stdin);
564 if(!(handle = fopen(name, "rb"))) {
565 fprintf(stderr, "%s: cannot open '%s' for reading\n", myname, name);
566 return 0;
567 //exit(EXIT_FAILURE);
568 }
569 return(handle);
570 }
571
572 static void
573 usage(void) {
574 /* print usage if asked, or if syntax incorrect */
575 fprintf(stderr,
576 "CRC RevEng: arbitrary-precision CRC calculator and algorithm finder\n"
577 "Usage:\t");
578 fputs(myname, stderr);
579 fprintf(stderr,
580 "\t-cdDesvhu? [-bBfFlLMrStVXyz]\n"
581 "\t\t[-a BITS] [-A OBITS] [-i INIT] [-k KPOLY] [-m MODEL]\n"
582 "\t\t[-p POLY] [-P RPOLY] [-q QPOLY] [-w WIDTH] [-x XOROUT]\n"
583 "\t\t[STRING...]\n"
584 "Options:\n"
585 "\t-a BITS\t\tbits per character (1 to %d)\n"
586 "\t-A OBITS\tbits per output character (1 to %d)\n"
587 "\t-i INIT\t\tinitial register value\n"
588 "\t-k KPOLY\tgenerator in Koopman notation (implies WIDTH)\n"
589 "\t-m MODEL\tpreset CRC algorithm\n"
590 "\t-p POLY\t\tgenerator or search range start polynomial\n"
591 "\t-P RPOLY\treversed generator polynomial (implies WIDTH)\n",
592 BMP_BIT, BMP_BIT);
593 fprintf(stderr,
594 "\t-q QPOLY\tsearch range end polynomial\n"
595 "\t-w WIDTH\tregister size, in bits\n"
596 "\t-x XOROUT\tfinal register XOR value\n"
597 "Modifier switches:\n"
598 "\t-b big-endian CRC\t\t-B big-endian CRC output\n"
599 "\t-f read files named in STRINGs\t-F find presets less quickly\n"
600 "\t-l little-endian CRC\t\t-L little-endian CRC output\n"
601 "\t-M non-augmenting algorithm\t-r right-justified output\n"
602 "\t-S print spaces between chars\t-t left-justified output\n"
603 "\t-V reverse algorithm only\t-X print uppercase hex\n"
604 "\t-y low bytes first in files\t-z raw binary STRINGs\n");
605 fprintf(stderr,
606 "Mode switches:\n"
607 "\t-c calculate CRCs\t\t-d dump algorithm parameters\n"
608 "\t-D list preset algorithms\t-e echo (and reformat) input\n"
609 "\t-s search for algorithm\t\t-v calculate reversed CRCs\n"
610 "\t-g search for alg given hex+crc\t-h | -u | -? show this help\n"
611 "Common Use Examples:\n"
612 "\t reveng -g 01020304e3\n"
613 "\t Searches for a known/common crc preset that computes the crc\n"
614 "\t on the end of the given hex string\n"
615 "\t reveng -w 8 -s 01020304e3 010204039d\n"
616 "\t Searches for any possible 8 bit width crc calc that computes\n"
617 "\t the crc on the end of the given hex string(s)\n"
618 "\t reveng -m CRC-8 -c 01020304\n"
619 "\t Calculates the crc-8 of the given hex string\n"
620 "\t reveng -D\n"
621 "\t Outputs a list of all known/common crc models with their\n"
622 "\t preset values\n"
623 "\n"
624 "Copyright (C) 2010, 2011, 2012, 2013, 2014, 2015, 2016 Gregory Cook\n"
625 "This is free software; see the source for copying conditions. There is NO\n"
626 "warranty; not even for MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.\n"
627 "Version "
628 VERSION
629 "\t\t\t\t <http://reveng.sourceforge.net/>\n");
630 }
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