lib/asn1/gen_encode.c

   1 /*
   2  * Copyright (c) 1997 - 2006 Kungliga Tekniska Högskolan
   3  * (Royal Institute of Technology, Stockholm, Sweden).
   4  * All rights reserved.
   5  *
   6  * Redistribution and use in source and binary forms, with or without
   7  * modification, are permitted provided that the following conditions
   8  * are met:
   9  *
  10  * 1. Redistributions of source code must retain the above copyright
  11  *    notice, this list of conditions and the following disclaimer.
  12  *
  13  * 2. Redistributions in binary form must reproduce the above copyright
  14  *    notice, this list of conditions and the following disclaimer in the
  15  *    documentation and/or other materials provided with the distribution.
  16  *
  17  * 3. Neither the name of the Institute nor the names of its contributors
  18  *    may be used to endorse or promote products derived from this software
  19  *    without specific prior written permission.
  20  *
  21  * THIS SOFTWARE IS PROVIDED BY THE INSTITUTE AND CONTRIBUTORS ``AS IS'' AND
  22  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  23  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  24  * ARE DISCLAIMED.  IN NO EVENT SHALL THE INSTITUTE OR CONTRIBUTORS BE LIABLE
  25  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  26  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  27  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  28  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  29  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  30  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  31  * SUCH DAMAGE.
  32  */
  33
  34 #include "gen_locl.h"
  35
  36 RCSID("$Id$");
  37
  38 static void
  39 encode_primitive (const char *typename, const char *name)
  40 {
  41     fprintf (codefile,
  42              "e = der_put_%s(p, len, %s, &l);\n"
  43              "if (e) return e;\np -= l; len -= l; ret += l;\n\n",
  44              typename,
  45              name);
  46 }
  47
  48 const char *
  49 classname(Der_class class)
  50 {
  51     const char *cn[] = { "ASN1_C_UNIV", "ASN1_C_APPL",
  52                          "ASN1_C_CONTEXT", "ASN1_C_PRIV" };
  53     if(class < ASN1_C_UNIV || class > ASN1_C_PRIVATE)
  54         return "???";
  55     return cn[class];
  56 }
  57
  58
  59 const char *
  60 valuename(Der_class class, int value)
  61 {
  62     static char s[32];
  63     struct {
  64         int value;
  65         const char *s;
  66     } *p, values[] = {
  67 #define X(Y) { Y, #Y }
  68         X(UT_BMPString),
  69         X(UT_BitString),
  70         X(UT_Boolean),
  71         X(UT_EmbeddedPDV),
  72         X(UT_Enumerated),
  73         X(UT_External),
  74         X(UT_GeneralString),
  75         X(UT_GeneralizedTime),
  76         X(UT_GraphicString),
  77         X(UT_IA5String),
  78         X(UT_Integer),
  79         X(UT_Null),
  80         X(UT_NumericString),
  81         X(UT_OID),
  82         X(UT_ObjectDescriptor),
  83         X(UT_OctetString),
  84         X(UT_PrintableString),
  85         X(UT_Real),
  86         X(UT_RelativeOID),
  87         X(UT_Sequence),
  88         X(UT_Set),
  89         X(UT_TeletexString),
  90         X(UT_UTCTime),
  91         X(UT_UTF8String),
  92         X(UT_UniversalString),
  93         X(UT_VideotexString),
  94         X(UT_VisibleString),
  95 #undef X
  96         { -1, NULL }
  97     };
  98     if(class == ASN1_C_UNIV) {
  99         for(p = values; p->value != -1; p++)
 100             if(p->value == value)
 101                 return p->s;
 102     }
 103     snprintf(s, sizeof(s), "%d", value);
 104     return s;
 105 }
 106
 107 static int
 108 encode_type (const char *name, const Type *t, const char *tmpstr)
 109 {
 110     int constructed = 1;
 111
 112     switch (t->type) {
 113     case TType:
 114 #if 0
 115         encode_type (name, t->symbol->type);
 116 #endif
 117         fprintf (codefile,
 118                  "e = encode_%s(p, len, %s, &l);\n"
 119                  "if (e) return e;\np -= l; len -= l; ret += l;\n\n",
 120                  t->symbol->gen_name, name);
 121         break;
 122     case TInteger:
 123         if(t->members) {
 124             fprintf(codefile,
 125                     "{\n"
 126                     "int enumint = (int)*%s;\n",
 127                     name);
 128             encode_primitive ("integer", "&enumint");
 129             fprintf(codefile, "}\n;");
 130         } else if (t->range == NULL) {
 131             encode_primitive ("heim_integer", name);
 132         } else if (t->range->min == INT_MIN && t->range->max == INT_MAX) {
 133             encode_primitive ("integer", name);
 134         } else if (t->range->min == 0 && t->range->max == UINT_MAX) {
 135             encode_primitive ("unsigned", name);
 136         } else if (t->range->min == 0 && t->range->max == INT_MAX) {
 137             encode_primitive ("unsigned", name);
 138         } else
 139             errx(1, "%s: unsupported range %d -> %d",
 140                  name, t->range->min, t->range->max);
 141         constructed = 0;
 142         break;
 143     case TBoolean:
 144         encode_primitive ("boolean", name);
 145         constructed = 0;
 146         break;
 147     case TOctetString:
 148         encode_primitive ("octet_string", name);
 149         constructed = 0;
 150         break;
 151     case TBitString: {
 152         Member *m;
 153         int pos;
 154
 155         if (ASN1_TAILQ_EMPTY(t->members)) {
 156             encode_primitive("bit_string", name);
 157             constructed = 0;
 158             break;
 159         }
 160
 161         fprintf (codefile, "{\n"
 162                  "unsigned char c = 0;\n");
 163         if (!rfc1510_bitstring)
 164             fprintf (codefile,
 165                      "int rest = 0;\n"
 166                      "int bit_set = 0;\n");
 167 #if 0
 168         pos = t->members->prev->val;
 169         /* fix for buggy MIT (and OSF?) code */
 170         if (pos > 31)
 171             abort ();
 172 #endif
 173         /*
 174          * It seems that if we do not always set pos to 31 here, the MIT
 175          * code will do the wrong thing.
 176          *
 177          * I hate ASN.1 (and DER), but I hate it even more when everybody
 178          * has to screw it up differently.
 179          */
 180         pos = ASN1_TAILQ_LAST(t->members, memhead)->val;
 181         if (rfc1510_bitstring) {
 182             if (pos < 31)
 183                 pos = 31;
 184         }
 185
 186         ASN1_TAILQ_FOREACH_REVERSE(m, t->members, memhead, members) {
 187             while (m->val / 8 < pos / 8) {
 188                 if (!rfc1510_bitstring)
 189                     fprintf (codefile,
 190                              "if (c != 0 || bit_set) {\n");
 191                 fprintf (codefile,
 192                          "if (len < 1) return ASN1_OVERFLOW;\n"
 193                          "*p-- = c; len--; ret++;\n");
 194                 if (!rfc1510_bitstring)
 195                     fprintf (codefile,
 196                              "if (!bit_set) {\n"
 197                              "rest = 0;\n"
 198                              "while(c) { \n"
 199                              "if (c & 1) break;\n"
 200                              "c = c >> 1;\n"
 201                              "rest++;\n"
 202                              "}\n"
 203                              "bit_set = 1;\n"
 204                              "}\n"
 205                              "}\n");
 206                 fprintf (codefile,
 207                          "c = 0;\n");
 208                 pos -= 8;
 209             }
 210             fprintf (codefile,
 211                      "if((%s)->%s) {\n"
 212                      "c |= 1<<%d;\n",
 213                      name, m->gen_name, 7 - m->val % 8);
 214             fprintf (codefile,
 215                      "}\n");
 216         }
 217
 218         if (!rfc1510_bitstring)
 219             fprintf (codefile,
 220                      "if (c != 0 || bit_set) {\n");
 221         fprintf (codefile,
 222                  "if (len < 1) return ASN1_OVERFLOW;\n"
 223                  "*p-- = c; len--; ret++;\n");
 224         if (!rfc1510_bitstring)
 225             fprintf (codefile,
 226                      "if (!bit_set) {\n"
 227                      "rest = 0;\n"
 228                      "if(c) { \n"
 229                      "while(c) { \n"
 230                      "if (c & 1) break;\n"
 231                      "c = c >> 1;\n"
 232                      "rest++;\n"
 233                      "}\n"
 234                      "}\n"
 235                      "}\n"
 236                      "}\n");
 237
 238         fprintf (codefile,
 239                  "if (len < 1) return ASN1_OVERFLOW;\n"
 240                  "*p-- = %s;\n"
 241                  "len -= 1;\n"
 242                  "ret += 1;\n"
 243                  "}\n\n",
 244                  rfc1510_bitstring ? "0" : "rest");
 245         constructed = 0;
 246         break;
 247     }
 248     case TEnumerated : {
 249         encode_primitive ("enumerated", name);
 250         constructed = 0;
 251         break;
 252     }
 253
 254     case TSet:
 255     case TSequence: {
 256         Member *m;
 257
 258         if (t->members == NULL)
 259             break;
 260
 261         ASN1_TAILQ_FOREACH_REVERSE(m, t->members, memhead, members) {
 262             char *s = NULL;
 263
 264             if (m->ellipsis)
 265                 continue;
 266
 267             if (asprintf (&s, "%s(%s)->%s", m->optional ? "" : "&", name, m->gen_name) < 0 || s == NULL)
 268                 errx(1, "malloc");
 269             fprintf(codefile, "/* %s */\n", m->name);
 270             if (m->optional)
 271                 fprintf (codefile,
 272                          "if(%s) ",
 273                          s);
 274             else if(m->defval)
 275                 gen_compare_defval(s + 1, m->defval);
 276             fprintf (codefile, "{\n");
 277             fprintf (codefile, "size_t %s_oldret = ret;\n", tmpstr);
 278             fprintf (codefile, "ret = 0;\n");
 279             encode_type (s, m->type, m->gen_name);
 280             fprintf (codefile, "ret += %s_oldret;\n", tmpstr);
 281             fprintf (codefile, "}\n");
 282             free (s);
 283         }
 284         break;
 285     }
 286     case TSetOf: {
 287
 288         fprintf(codefile,
 289                 "{\n"
 290                 "struct heim_octet_string *val;\n"
 291                 "size_t elen = 0, totallen = 0;\n"
 292                 "int eret = 0;\n");
 293
 294         fprintf(codefile,
 295                 "if ((%s)->len > UINT_MAX/sizeof(val[0]))\n"
 296                 "return ERANGE;\n",
 297                 name);
 298
 299         fprintf(codefile,
 300                 "val = malloc(sizeof(val[0]) * (%s)->len);\n"
 301                 "if (val == NULL && (%s)->len != 0) return ENOMEM;\n",
 302                 name, name);
 303
 304         fprintf(codefile,
 305                 "for(i = 0; i < (%s)->len; i++) {\n",
 306                 name);
 307
 308         fprintf(codefile,
 309                 "ASN1_MALLOC_ENCODE(%s, val[i].data, "
 310                 "val[i].length, &(%s)->val[i], &elen, eret);\n",
 311                 t->subtype->symbol->gen_name,
 312                 name);
 313
 314         fprintf(codefile,
 315                 "if(eret) {\n"
 316                 "i--;\n"
 317                 "while (i >= 0) {\n"
 318                 "free(val[i].data);\n"
 319                 "i--;\n"
 320                 "}\n"
 321                 "free(val);\n"
 322                 "return eret;\n"
 323                 "}\n"
 324                 "totallen += elen;\n"
 325                 "}\n");
 326
 327         fprintf(codefile,
 328                 "if (totallen > len) {\n"
 329                 "for (i = 0; i < (%s)->len; i++) {\n"
 330                 "free(val[i].data);\n"
 331                 "}\n"
 332                 "free(val);\n"
 333                 "return ASN1_OVERFLOW;\n"
 334                 "}\n",
 335                 name);
 336
 337         fprintf(codefile,
 338                 "qsort(val, (%s)->len, sizeof(val[0]), _heim_der_set_sort);\n",
 339                 name);
 340
 341         fprintf (codefile,
 342                  "for(i = (%s)->len - 1; i >= 0; --i) {\n"
 343                  "p -= val[i].length;\n"
 344                  "ret += val[i].length;\n"
 345                  "memcpy(p + 1, val[i].data, val[i].length);\n"
 346                  "free(val[i].data);\n"
 347                  "}\n"
 348                  "free(val);\n"
 349                  "}\n",
 350                  name);
 351         break;
 352     }
 353     case TSequenceOf: {
 354         char *sname = NULL;
 355         char *n = NULL;
 356
 357         fprintf (codefile,
 358                  "for(i = (%s)->len - 1; i >= 0; --i) {\n"
 359                  "size_t %s_for_oldret = ret;\n"
 360                  "ret = 0;\n",
 361                  name, tmpstr);
 362         if (asprintf (&n, "&(%s)->val[i]", name) < 0 || n == NULL)
 363             errx(1, "malloc");
 364         if (asprintf (&sname, "%s_S_Of", tmpstr) < 0 || sname == NULL)
 365             errx(1, "malloc");
 366         encode_type (n, t->subtype, sname);
 367         fprintf (codefile,
 368                  "ret += %s_for_oldret;\n"
 369                  "}\n",
 370                  tmpstr);
 371         free (n);
 372         free (sname);
 373         break;
 374     }
 375     case TGeneralizedTime:
 376         encode_primitive ("generalized_time", name);
 377         constructed = 0;
 378         break;
 379     case TGeneralString:
 380         encode_primitive ("general_string", name);
 381         constructed = 0;
 382         break;
 383     case TTeletexString:
 384         encode_primitive ("general_string", name);
 385         constructed = 0;
 386         break;
 387     case TTag: {
 388         char *tname = NULL;
 389         int c;
 390         if (asprintf (&tname, "%s_tag", tmpstr) < 0 || tname == NULL)
 391             errx(1, "malloc");
 392         c = encode_type (name, t->subtype, tname);
 393         fprintf (codefile,
 394                  "e = der_put_length_and_tag (p, len, ret, %s, %s, %s, &l);\n"
 395                  "if (e) return e;\np -= l; len -= l; ret += l;\n\n",
 396                  classname(t->tag.tagclass),
 397                  c ? "CONS" : "PRIM",
 398                  valuename(t->tag.tagclass, t->tag.tagvalue));
 399         free (tname);
 400         break;
 401     }
 402     case TChoice:{
 403         Member *m, *have_ellipsis = NULL;
 404         char *s = NULL;
 405
 406         if (t->members == NULL)
 407             break;
 408
 409         fprintf(codefile, "\n");
 410
 411         if (asprintf (&s, "(%s)", name) < 0 || s == NULL)
 412             errx(1, "malloc");
 413         fprintf(codefile, "switch(%s->element) {\n", s);
 414
 415         ASN1_TAILQ_FOREACH_REVERSE(m, t->members, memhead, members) {
 416             char *s2 = NULL;
 417
 418             if (m->ellipsis) {
 419                 have_ellipsis = m;
 420                 continue;
 421             }
 422
 423             fprintf (codefile, "case %s: {", m->label);
 424             if (asprintf(&s2, "%s(%s)->u.%s", m->optional ? "" : "&",
 425                          s, m->gen_name) < 0 || s2 == NULL)
 426                 errx(1, "malloc");
 427             if (m->optional)
 428                 fprintf (codefile, "if(%s) {\n", s2);
 429             fprintf (codefile, "size_t %s_oldret = ret;\n", tmpstr);
 430             fprintf (codefile, "ret = 0;\n");
 431             constructed = encode_type (s2, m->type, m->gen_name);
 432             fprintf (codefile, "ret += %s_oldret;\n", tmpstr);
 433             if(m->optional)
 434                 fprintf (codefile, "}\n");
 435             fprintf(codefile, "break;\n");
 436             fprintf(codefile, "}\n");
 437             free (s2);
 438         }
 439         free (s);
 440         if (have_ellipsis) {
 441             fprintf(codefile,
 442                     "case %s: {\n"
 443                     "if (len < (%s)->u.%s.length)\n"
 444                     "return ASN1_OVERFLOW;\n"
 445                     "p -= (%s)->u.%s.length;\n"
 446                     "ret += (%s)->u.%s.length;\n"
 447                     "memcpy(p + 1, (%s)->u.%s.data, (%s)->u.%s.length);\n"
 448                     "break;\n"
 449                     "}\n",
 450                     have_ellipsis->label,
 451                     name, have_ellipsis->gen_name,
 452                     name, have_ellipsis->gen_name,
 453                     name, have_ellipsis->gen_name,
 454                     name, have_ellipsis->gen_name,
 455                     name, have_ellipsis->gen_name);
 456         }
 457         fprintf(codefile, "};\n");
 458         break;
 459     }
 460     case TOID:
 461         encode_primitive ("oid", name);
 462         constructed = 0;
 463         break;
 464     case TUTCTime:
 465         encode_primitive ("utctime", name);
 466         constructed = 0;
 467         break;
 468     case TUTF8String:
 469         encode_primitive ("utf8string", name);
 470         constructed = 0;
 471         break;
 472     case TPrintableString:
 473         encode_primitive ("printable_string", name);
 474         constructed = 0;
 475         break;
 476     case TIA5String:
 477         encode_primitive ("ia5_string", name);
 478         constructed = 0;
 479         break;
 480     case TBMPString:
 481         encode_primitive ("bmp_string", name);
 482         constructed = 0;
 483         break;
 484     case TUniversalString:
 485         encode_primitive ("universal_string", name);
 486         constructed = 0;
 487         break;
 488     case TVisibleString:
 489         encode_primitive ("visible_string", name);
 490         constructed = 0;
 491         break;
 492     case TNull:
 493         fprintf (codefile, "/* NULL */\n");
 494         constructed = 0;
 495         break;
 496     default:
 497         abort ();
 498     }
 499     return constructed;
 500 }
 501
 502 void
 503 generate_type_encode (const Symbol *s)
 504 {
 505     fprintf (codefile, "int ASN1CALL\n"
 506              "encode_%s(unsigned char *p, size_t len,"
 507              " const %s *data, size_t *size)\n"
 508              "{\n",
 509              s->gen_name, s->gen_name);
 510
 511     switch (s->type->type) {
 512     case TInteger:
 513     case TBoolean:
 514     case TOctetString:
 515     case TGeneralizedTime:
 516     case TGeneralString:
 517     case TTeletexString:
 518     case TUTCTime:
 519     case TUTF8String:
 520     case TPrintableString:
 521     case TIA5String:
 522     case TBMPString:
 523     case TUniversalString:
 524     case TVisibleString:
 525     case TNull:
 526     case TBitString:
 527     case TEnumerated:
 528     case TOID:
 529     case TSequence:
 530     case TSequenceOf:
 531     case TSet:
 532     case TSetOf:
 533     case TTag:
 534     case TType:
 535     case TChoice:
 536         fprintf (codefile,
 537                  "size_t ret = 0;\n"
 538                  "size_t l;\n"
 539                  "int i, e;\n\n");
 540         fprintf(codefile, "i = 0;\n"); /* hack to avoid `unused variable' */
 541
 542         encode_type("data", s->type, "Top");
 543
 544         fprintf (codefile, "*size = ret;\n"
 545                  "return 0;\n");
 546         break;
 547     default:
 548         abort ();
 549     }
 550     fprintf (codefile, "}\n\n");
 551 }