git.zerfleddert.de Git - proxmark3-svn/blob - client/cmdcrc.c

   1 //-----------------------------------------------------------------------------
   2 // Copyright (C) 2015 iceman <iceman at iuse.se>
   3 //
   4 // This code is licensed to you under the terms of the GNU GPL, version 2 or,
   5 // at your option, any later version. See the LICENSE.txt file for the text of
   6 // the license.
   7 //-----------------------------------------------------------------------------
   8 // CRC Calculations from the software reveng commands
   9 //-----------------------------------------------------------------------------
  10
  11 #include <stdlib.h>
  12 #ifdef _WIN32
  13 #  include <io.h>
  14 #  include <fcntl.h>
  15 #  ifndef STDIN_FILENO
  16 #    define STDIN_FILENO 0
  17 #  endif /* STDIN_FILENO */
  18 #endif /* _WIN32 */
  19
  20 #include <stdio.h>
  21 #include <string.h>
  22 //#include <stdlib.h>
  23 //#include <ctype.h>
  24 #include "cmdmain.h"
  25 #include "cmdcrc.h"
  26 #include "reveng/reveng.h"
  27 #include "ui.h"
  28 #include "util.h"
  29
  30 #define MAX_ARGS 20
  31
  32 int uerr(char *msg){
  33         PrintAndLog("%s",msg);
  34         return 0;
  35 }
  36
  37 int split(char *str, char *arr[MAX_ARGS]){
  38         int beginIndex = 0;
  39         int endIndex;
  40         int maxWords = MAX_ARGS;
  41         int wordCnt = 0;
  42
  43         while(1){
  44                 while(isspace(str[beginIndex])){
  45                         ++beginIndex;
  46                 }
  47                 if(str[beginIndex] == '\0')
  48                         break;
  49                         endIndex = beginIndex;
  50                 while (str[endIndex] && !isspace(str[endIndex])){
  51                         ++endIndex;
  52                 }
  53                 int len = endIndex - beginIndex;
  54                 char *tmp = calloc(len + 1, sizeof(char));
  55                 memcpy(tmp, &str[beginIndex], len);
  56                 arr[wordCnt++] = tmp;
  57                 //PrintAndLog("cnt: %d, %s",wordCnt-1, arr[wordCnt-1]);
  58                 beginIndex = endIndex;
  59                 if (wordCnt == maxWords)
  60                         break;
  61         }
  62         return wordCnt;
  63 }
  64
  65 int CmdCrc(const char *Cmd)
  66 {
  67         char name[] = {"reveng "};
  68         char Cmd2[50 + 7];
  69         memcpy(Cmd2, name, 7);
  70         memcpy(Cmd2 + 7, Cmd, 50);
  71         char *argv[MAX_ARGS];
  72         int argc = split(Cmd2, argv);
  73         //PrintAndLog("argc: %d, %s %s Cmd: %s",argc, argv[0], Cmd2, Cmd);
  74         reveng_main(argc, argv);
  75         for(int i = 0; i < argc; ++i){
  76                 //puts(arr[i]);
  77                 free(argv[i]);
  78         }
  79
  80         return 0;
  81 }
  82
  83 int GetModels(char *Models[], int *count, uint32_t *width){
  84         /* default values */
  85         static model_t model = {
  86                 PZERO,          /* no CRC polynomial, user must specify */
  87                 PZERO,          /* Init = 0 */
  88                 P_BE,           /* RefIn = false, RefOut = false, plus P_RTJUST setting in reveng.h */
  89                 PZERO,          /* XorOut = 0 */
  90                 PZERO,          /* check value unused */
  91                 NULL            /* no model name */
  92         };
  93         int ibperhx = 8;//, obperhx = 8;
  94         int rflags = 0, uflags = 0; /* search and UI flags */
  95
  96         //unsigned long width = 0UL;
  97         //int c, mode = 0, args, psets, pass;
  98         poly_t apoly, crc, qpoly = PZERO, *apolys = NULL, *pptr = NULL, *qptr = NULL;
  99         model_t pset = model, *candmods, *mptr;
 100         //char *string;
 101
 102         //myname = argv[0];
 103
 104         /* stdin must be binary */
 105         #ifdef _WIN32
 106                 _setmode(STDIN_FILENO, _O_BINARY);
 107         #endif /* _WIN32 */
 108
 109         SETBMP();
 110
 111         //pos=0;
 112         //optind=1;
 113
 114         int args = 0, psets, pass;
 115         int Cnt = 0;
 116         if (*width == 0) { //reveng -D
 117                 *count = mcount();
 118                 //PrintAndLog("Count: %d",*count);
 119                 if(!*count)
 120                         return uerr("no preset models available");
 121
 122                 for(int mode = 0; mode < *count; ++mode) {
 123                         mbynum(&model, mode);
 124                         mcanon(&model);
 125                         size_t size = (model.name && *model.name) ? strlen(model.name) : 6;
 126                         //PrintAndLog("Size: %d, %s",size,model.name);
 127                         char *tmp = calloc(size+1, sizeof(char));
 128                         if (tmp==NULL)
 129                                 return uerr("out of memory?");
 130
 131                         memcpy(tmp, model.name, size);
 132                         Models[mode] = tmp;
 133                         //ufound(&model);
 134                 }
 135         } else { //reveng -s
 136
 137                         if(~model.flags & P_MULXN)
 138                                 return uerr("cannot search for non-Williams compliant models");
 139
 140                         praloc(&model.spoly, *width);
 141                         praloc(&model.init, *width);
 142                         praloc(&model.xorout, *width);
 143                         if(!plen(model.spoly))
 144                                 palloc(&model.spoly, *width);
 145                         else
 146                                 *width = plen(model.spoly);
 147
 148                         /* special case if qpoly is zero, search to end of range */
 149                         if(!ptst(qpoly))
 150                                 rflags &= ~R_HAVEQ;
 151
 152
 153                         /* not going to be sending additional args
 154
 155                         // allocate argument array
 156                         args = argc - optind;
 157                         if(!(apolys = malloc(args * sizeof(poly_t))))
 158                                 return uerr("cannot allocate memory for argument list");
 159
 160                         for(pptr = apolys; optind < argc; ++optind) {
 161                                 if(uflags & C_INFILE)
 162                                         *pptr++ = rdpoly(argv[optind], model.flags, ibperhx);
 163                                 else
 164                                         *pptr++ = strtop(argv[optind], model.flags, ibperhx);
 165                         }
 166                         // exit value of pptr is used hereafter!
 167
 168                         */
 169
 170                         /* if endianness not specified, try
 171                          * little-endian then big-endian.
 172                          * NB: crossed-endian algorithms will not be
 173                          * searched.
 174                          */
 175                         /* scan against preset models */
 176                         if(~uflags & C_FORCE) {
 177                                 pass = 0;
 178                                 Cnt = 0;
 179                                 do {
 180                                         psets = mcount();
 181                                         //PrintAndLog("psets: %d",psets);
 182                                         while(psets) {
 183                                                 mbynum(&pset, --psets);
 184
 185                                                 /* skip if different width, or refin or refout don't match */
 186                                                 if(plen(pset.spoly) != *width || (model.flags ^ pset.flags) & (P_REFIN | P_REFOUT))
 187                                                         continue;
 188                                                 /* skip if the preset doesn't match specified parameters */
 189                                                 if(rflags & R_HAVEP && pcmp(&model.spoly, &pset.spoly))
 190                                                         continue;
 191                                                 if(rflags & R_HAVEI && psncmp(&model.init, &pset.init))
 192                                                         continue;
 193                                                 if(rflags & R_HAVEX && psncmp(&model.xorout, &pset.xorout))
 194                                                         continue;
 195
 196                                                 apoly = pclone(pset.xorout);
 197                                                 if(pset.flags & P_REFOUT)
 198                                                         prev(&apoly);
 199                                                 for(qptr = apolys; qptr < pptr; ++qptr) {
 200                                                         crc = pcrc(*qptr, pset.spoly, pset.init, apoly, 0);
 201                                                         if(ptst(crc)) {
 202                                                                 pfree(&crc);
 203                                                                 break;
 204                                                         } else
 205                                                                 pfree(&crc);
 206                                                 }
 207                                                 pfree(&apoly);
 208                                                 if(qptr == pptr) {
 209                                                         /* the selected model solved all arguments */
 210                                                         mcanon(&pset);
 211
 212                                                         size_t size = (pset.name && *pset.name) ? strlen(pset.name) : 6;
 213                                                         //PrintAndLog("Size: %d, %s, count: %d",size,pset.name, Cnt);
 214                                                         char *tmp = calloc(size+1, sizeof(char));
 215                                                         if (tmp==NULL){
 216                                                                 PrintAndLog("out of memory?");
 217                                                                 return 0;
 218                                                         }
 219                                                         memcpy(tmp, pset.name, size);
 220                                                         Models[Cnt++] = tmp;
 221                                                         *count = Cnt;
 222                                                         //ufound(&pset);
 223                                                         uflags |= C_RESULT;
 224                                                 }
 225                                         }
 226                                         mfree(&pset);
 227
 228                                         /* toggle refIn/refOut and reflect arguments */
 229                                         if(~rflags & R_HAVERI) {
 230                                                 model.flags ^= P_REFIN | P_REFOUT;
 231                                                 for(qptr = apolys; qptr < pptr; ++qptr)
 232                                                         prevch(qptr, ibperhx);
 233                                         }
 234                                 } while(~rflags & R_HAVERI && ++pass < 2);
 235                         }
 236                         if(uflags & C_RESULT) {
 237                                 for(qptr = apolys; qptr < pptr; ++qptr)
 238                                         pfree(qptr);
 239                                 return 1;
 240                                 //exit(EXIT_SUCCESS);
 241                         }
 242                         if(!(model.flags & P_REFIN) != !(model.flags & P_REFOUT))
 243                                 return uerr("cannot search for crossed-endian models");
 244                         pass = 0;
 245                         do {
 246                                 mptr = candmods = reveng(&model, qpoly, rflags, args, apolys);
 247                                 if(mptr && plen(mptr->spoly))
 248                                         uflags |= C_RESULT;
 249                                 while(mptr && plen(mptr->spoly)) {
 250                                         /* results were printed by the callback
 251                                          * string = mtostr(mptr);
 252                                          * puts(string);
 253                                          * free(string);
 254                                          */
 255                                         mfree(mptr++);
 256                                 }
 257                                 free(candmods);
 258                                 if(~rflags & R_HAVERI) {
 259                                         model.flags ^= P_REFIN | P_REFOUT;
 260                                         for(qptr = apolys; qptr < pptr; ++qptr)
 261                                                 prevch(qptr, ibperhx);
 262                                 }
 263                         } while(~rflags & R_HAVERI && ++pass < 2);
 264                         for(qptr = apolys; qptr < pptr; ++qptr)
 265                                 pfree(qptr);
 266                         free(apolys);
 267                         if(~uflags & C_RESULT)
 268                                 return uerr("no models found");
 269
 270
 271         }
 272         //PrintAndLog("DONE");
 273         return 1;
 274 }
 275
 276 //test call to GetModels
 277 int CmdrevengTest(const char *Cmd){
 278         char *Models[80];
 279         int count = 0;
 280         uint32_t width = 0;
 281         width = param_get8(Cmd, 0);
 282         //PrintAndLog("width: %d",width);
 283         if (width > 89)
 284                 return uerr("Width cannot exceed 89");
 285
 286         int ans = GetModels(Models, &count, &width);
 287         if (!ans) return 0;
 288
 289         PrintAndLog("Count: %d",count);
 290         for (int i = 0; i < count; i++){
 291                 PrintAndLog("Model %d: %s",i,Models[i]);
 292                 free(Models[i]);
 293         }
 294         return 1;
 295 }
 296
 297 //-c || -v
 298 int RunModel(char *inModel, char *inHexStr, bool reverse, char *result){
 299         /* default values */
 300         static model_t model = {
 301                 PZERO,          // no CRC polynomial, user must specify
 302                 PZERO,          // Init = 0
 303                 P_BE,             // RefIn = false, RefOut = false, plus P_RTJUST setting in reveng.h
 304                 PZERO,          // XorOut = 0
 305                 PZERO,          // check value unused
 306                 NULL              // no model name
 307         };
 308         int ibperhx = 8, obperhx = 8;
 309         int rflags = 0; // search flags
 310         int c;
 311         unsigned long width = 0UL;
 312         poly_t apoly, crc;
 313
 314         char *string;
 315
 316         // stdin must be binary
 317         #ifdef _WIN32
 318                 _setmode(STDIN_FILENO, _O_BINARY);
 319         #endif /* _WIN32 */
 320
 321         SETBMP();
 322         //set model
 323         if(!(c = mbynam(&model, inModel))) {
 324                 fprintf(stderr,"error: preset model '%s' not found.  Use reveng -D to list presets.\n", inModel);
 325                 return 0;
 326         }
 327         if(c < 0)
 328                 return uerr("no preset models available");
 329
 330         // must set width so that parameter to -ipx is not zeroed
 331         width = plen(model.spoly);
 332         rflags |= R_HAVEP | R_HAVEI | R_HAVERI | R_HAVERO | R_HAVEX;
 333
 334         mcanon(&model);
 335
 336         if (reverse) {
 337                 // v  calculate reversed CRC
 338                 /* Distinct from the -V switch as this causes
 339                  * the arguments and output to be reversed as well.
 340                  */
 341                 // reciprocate Poly
 342                 prcp(&model.spoly);
 343
 344                 /* mrev() does:
 345                  *   if(refout) prev(init); else prev(xorout);
 346                  * but here the entire argument polynomial is
 347                  * reflected, not just the characters, so RefIn
 348                  * and RefOut are not inverted as with -V.
 349                  * Consequently Init is the mirror image of the
 350                  * one resulting from -V, and so we have:
 351                  */
 352                 if(~model.flags & P_REFOUT) {
 353                         prev(&model.init);
 354                         prev(&model.xorout);
 355                 }
 356
 357                 // swap init and xorout
 358                 apoly = model.init;
 359                 model.init = model.xorout;
 360                 model.xorout = apoly;
 361         }
 362         // c  calculate CRC
 363
 364         // validate inputs
 365         /* if(plen(model.spoly) == 0) {
 366          *      fprintf(stderr,"%s: no polynomial specified for -%c (add -w WIDTH -p POLY)\n", myname, mode);
 367          *      exit(EXIT_FAILURE);
 368          * }
 369          */
 370
 371         /* in the Williams model, xorout is applied after the refout stage.
 372          * as refout is part of ptostr(), we reverse xorout here.
 373          */
 374         if(model.flags & P_REFOUT)
 375                 prev(&model.xorout);
 376
 377         apoly = strtop(inHexStr, model.flags, ibperhx);
 378
 379         if(reverse)
 380                 prev(&apoly);
 381
 382         crc = pcrc(apoly, model.spoly, model.init, model.xorout, model.flags);
 383
 384         if(reverse)
 385                 prev(&crc);
 386
 387         string = ptostr(crc, model.flags, obperhx);
 388         for (int i = 0; i < 50; i++){
 389                 result[i] = string[i];
 390                 if (result[i]==0) break;
 391         }
 392         free(string);
 393         pfree(&crc);
 394         pfree(&apoly);
 395         return 1;
 396 }
 397
 398 //test call to RunModel
 399 int CmdrevengTestC(const char *Cmd){
 400         int cmdp = 0;
 401         char inModel[30] = {0x00};
 402         char inHexStr[30] = {0x00};
 403         char result[30];
 404         int dataLen;
 405
 406         dataLen = param_getstr(Cmd, cmdp++, inModel);
 407         if (dataLen < 4) return 0;
 408         dataLen = param_getstr(Cmd, cmdp++, inHexStr);
 409         if (dataLen < 4) return 0;
 410         bool reverse = (param_get8(Cmd, cmdp)) ? true : false;
 411
 412         //PrintAndLog("mod: %s, hex: %s, rev %d", inModel, inHexStr, reverse);
 413         int ans = RunModel(inModel, inHexStr, reverse, result);
 414         if (!ans) return 0;
 415
 416         PrintAndLog("Result: %s",result);
 417         return 1;
 418 }