lib/parser_aux.c

   1 /*
   2  *      Copyright (C) 2004, 2006 Free Software Foundation
   3  *      Copyright (C) 2000,2001 Fabio Fiorina
   4  *
   5  * This file is part of LIBTASN1.
   6  *
   7  * The LIBTASN1 library is free software; you can redistribute it
   8  * and/or modify it under the terms of the GNU Lesser General Public
   9  * License as published by the Free Software Foundation; either
  10  * version 2.1 of the License, or (at your option) any later version.
  11  *
  12  * This library is distributed in the hope that it will be useful, but
  13  * WITHOUT ANY WARRANTY; without even the implied warranty of
  14  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  15  * Lesser General Public License for more details.
  16  *
  17  * You should have received a copy of the GNU Lesser General Public
  18  * License along with this library; if not, write to the Free Software
  19  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
  20  * 02110-1301, USA
  21  */
  22
  23 #include <int.h>
  24 #include <errors.h>
  25 #include "parser_aux.h"
  26 #include "gstr.h"
  27 #include "structure.h"
  28 #include "element.h"
  29
  30 char _asn1_identifierMissing[MAX_NAME_SIZE+1]; /* identifier name not found */
  31
  32 /***********************************************/
  33 /* Type: list_type                             */
  34 /* Description: type used in the list during   */
  35 /* the structure creation.                     */
  36 /***********************************************/
  37 typedef struct list_struct{
  38   node_asn           *node;
  39   struct list_struct *next;
  40 } list_type;
  41
  42
  43 /* Pointer to the first element of the list */
  44 list_type *firstElement=NULL;
  45
  46 /******************************************************/
  47 /* Function : _asn1_add_node                          */
  48 /* Description: creates a new NODE_ASN element and    */
  49 /* puts it in the list pointed by firstElement.       */
  50 /* Parameters:                                        */
  51 /*   type: type of the new element (see TYPE_         */
  52 /*         and CONST_ constants).                     */
  53 /* Return: pointer to the new element.                */
  54 /******************************************************/
  55 node_asn *
  56 _asn1_add_node(unsigned int type)
  57 {
  58   list_type *listElement;
  59   node_asn *punt;
  60
  61   punt=(node_asn *) _asn1_malloc(sizeof(node_asn));
  62   if (punt==NULL) return NULL;
  63
  64   listElement=(list_type *) _asn1_malloc(sizeof(list_type));
  65   if(listElement==NULL){
  66     _asn1_free(punt);
  67     return NULL;
  68   }
  69
  70   listElement->node=punt;
  71   listElement->next=firstElement;
  72   firstElement=listElement;
  73
  74   punt->left=NULL;
  75   punt->name=NULL;
  76   punt->type=type;
  77   punt->value=NULL;
  78   punt->down=NULL;
  79   punt->right=NULL;
  80
  81   return punt;
  82 }
  83
  84 /**
  85  * asn1_find_node:
  86  * @pointer: NODE_ASN element pointer.
  87  * @name: null terminated string with the element's name to find.
  88  *
  89  * Searches for an element called NAME starting from POINTER.  The
  90  * name is composed by differents identifiers separated by dots.  When
  91  * *POINTER has a name, the first identifier must be the name of
  92  * *POINTER, otherwise it must be the name of one child of *POINTER.
  93  *
  94  * Return value: the searching result. NULL if not found.
  95  **/
  96 ASN1_TYPE
  97 asn1_find_node(ASN1_TYPE pointer, const char *name)
  98 {
  99   node_asn *p;
 100   char *n_end,n[MAX_NAME_SIZE+1];
 101   const char *n_start;
 102
 103   if(pointer == NULL) return NULL;
 104
 105   if(name==NULL) return NULL;
 106
 107   p=pointer;
 108   n_start=name;
 109
 110   if(p->name != NULL){ /* has *pointer got a name ? */
 111     n_end=strchr(n_start,'.');     /* search the first dot */
 112     if(n_end){
 113       memcpy(n,n_start,n_end-n_start);
 114       n[n_end-n_start]=0;
 115       n_start=n_end;
 116       n_start++;
 117     }
 118     else{
 119       _asn1_str_cpy(n,sizeof(n),n_start);
 120       n_start=NULL;
 121     }
 122
 123     while(p){
 124       if((p->name) && (!strcmp(p->name,n))) break;
 125       else p=p->right;
 126     } /* while */
 127
 128     if(p==NULL) return NULL;
 129   }
 130   else{ /* *pointer doesn't have a name */
 131     if(n_start[0]==0)
 132       return p;
 133   }
 134
 135   while(n_start){   /* Has the end of NAME been reached? */
 136     n_end=strchr(n_start,'.');    /* search the next dot */
 137     if(n_end){
 138       memcpy(n,n_start,n_end-n_start);
 139       n[n_end-n_start]=0;
 140       n_start=n_end;
 141       n_start++;
 142     }
 143     else{
 144       _asn1_str_cpy(n,sizeof(n),n_start);
 145       n_start=NULL;
 146     }
 147
 148     if(p->down==NULL) return NULL;
 149
 150     p=p->down;
 151
 152     /* The identifier "?LAST" indicates the last element
 153        in the right chain. */
 154     if(!strcmp(n,"?LAST")){
 155       if(p==NULL) return NULL;
 156       while(p->right) p=p->right;
 157     }
 158     else{   /* no "?LAST" */
 159       while(p){
 160         if((p->name) && (!strcmp(p->name,n))) break;
 161         else p=p->right;
 162       }
 163       if(p==NULL) return NULL;
 164     }
 165   } /* while */
 166
 167   return p;
 168 }
 169
 170
 171 /******************************************************************/
 172 /* Function : _asn1_set_value                                     */
 173 /* Description: sets the field VALUE in a NODE_ASN element. The   */
 174 /*              previous value (if exist) will be lost            */
 175 /* Parameters:                                                    */
 176 /*   node: element pointer.                                       */
 177 /*   value: pointer to the value that you want to set.            */
 178 /*   len: character number of value.                              */
 179 /* Return: pointer to the NODE_ASN element.                       */
 180 /******************************************************************/
 181 node_asn *
 182 _asn1_set_value(node_asn *node,const unsigned char *value,unsigned int len)
 183 {
 184
 185   if(node==NULL) return node;
 186   if(node->value){
 187     _asn1_free(node->value);
 188     node->value=NULL;
 189     node->value_len = 0;
 190   }
 191   if(!len) return node;
 192   node->value=(unsigned char *) _asn1_malloc(len);
 193   if (node->value==NULL) return NULL;
 194   node->value_len = len;
 195
 196   memcpy(node->value,value,len);
 197   return node;
 198 }
 199
 200 /******************************************************************/
 201 /* Function : _asn1_set_name                                      */
 202 /* Description: sets the field NAME in a NODE_ASN element. The    */
 203 /*              previous value (if exist) will be lost            */
 204 /* Parameters:                                                    */
 205 /*   node: element pointer.                                       */
 206 /*   name: a null terminated string with the name that you want   */
 207 /*         to set.                                                */
 208 /* Return: pointer to the NODE_ASN element.                       */
 209 /******************************************************************/
 210 node_asn *
 211 _asn1_set_name(node_asn *node,const char *name)
 212 {
 213   if(node==NULL) return node;
 214
 215   if(node->name){
 216     _asn1_free(node->name);
 217     node->name=NULL;
 218   }
 219
 220   if(name==NULL) return node;
 221
 222   if(strlen(name))
 223         {
 224         node->name=(char *) _asn1_strdup( name);
 225         if (node->name==NULL) return NULL;
 226       }
 227   else node->name=NULL;
 228   return node;
 229 }
 230
 231 /******************************************************************/
 232 /* Function : _asn1_set_right                                     */
 233 /* Description: sets the field RIGHT in a NODE_ASN element.       */
 234 /* Parameters:                                                    */
 235 /*   node: element pointer.                                       */
 236 /*   right: pointer to a NODE_ASN element that you want be pointed*/
 237 /*          by NODE.                                              */
 238 /* Return: pointer to *NODE.                                      */
 239 /******************************************************************/
 240 node_asn *
 241 _asn1_set_right(node_asn *node,node_asn *right)
 242 {
 243   if(node==NULL) return node;
 244   node->right=right;
 245   if(right) right->left=node;
 246   return node;
 247 }
 248
 249 /******************************************************************/
 250 /* Function : _asn1_get_right                                     */
 251 /* Description: returns the element pointed by the RIGHT field of */
 252 /*              a NODE_ASN element.                               */
 253 /* Parameters:                                                    */
 254 /*   node: NODE_ASN element pointer.                              */
 255 /* Return: field RIGHT of NODE.                                   */
 256 /******************************************************************/
 257 node_asn *
 258 _asn1_get_right(node_asn *node)
 259 {
 260   if(node==NULL) return NULL;
 261   return node->right;
 262 }
 263
 264 /******************************************************************/
 265 /* Function : _asn1_get_last_right                                */
 266 /* Description: return the last element along the right chain.    */
 267 /* Parameters:                                                    */
 268 /*   node: starting element pointer.                              */
 269 /* Return: pointer to the last element along the right chain.     */
 270 /******************************************************************/
 271 node_asn *
 272 _asn1_get_last_right(node_asn *node)
 273 {
 274   node_asn *p;
 275
 276   if(node==NULL) return NULL;
 277   p=node;
 278   while(p->right) p=p->right;
 279   return p;
 280 }
 281
 282 /******************************************************************/
 283 /* Function : _asn1_set_down                                      */
 284 /* Description: sets the field DOWN in a NODE_ASN element.        */
 285 /* Parameters:                                                    */
 286 /*   node: element pointer.                                       */
 287 /*   down: pointer to a NODE_ASN element that you want be pointed */
 288 /*          by NODE.                                              */
 289 /* Return: pointer to *NODE.                                      */
 290 /******************************************************************/
 291 node_asn *
 292 _asn1_set_down(node_asn *node,node_asn *down)
 293 {
 294   if(node==NULL) return node;
 295   node->down=down;
 296   if(down) down->left=node;
 297   return node;
 298 }
 299
 300 /******************************************************************/
 301 /* Function : _asn1_get_down                                      */
 302 /* Description: returns the element pointed by the DOWN field of  */
 303 /*              a NODE_ASN element.                               */
 304 /* Parameters:                                                    */
 305 /*   node: NODE_ASN element pointer.                              */
 306 /* Return: field DOWN of NODE.                                    */
 307 /******************************************************************/
 308 node_asn *
 309 _asn1_get_down(node_asn *node)
 310 {
 311   if(node==NULL) return NULL;
 312   return node->down;
 313 }
 314
 315 /******************************************************************/
 316 /* Function : _asn1_get_name                                      */
 317 /* Description: returns the name of a NODE_ASN element.           */
 318 /* Parameters:                                                    */
 319 /*   node: NODE_ASN element pointer.                              */
 320 /* Return: a null terminated string.                              */
 321 /******************************************************************/
 322 char *
 323 _asn1_get_name(node_asn *node)
 324 {
 325   if(node==NULL) return NULL;
 326   return node->name;
 327 }
 328
 329 /******************************************************************/
 330 /* Function : _asn1_mod_type                                      */
 331 /* Description: change the field TYPE of an NODE_ASN element.     */
 332 /*              The new value is the old one | (bitwise or) the   */
 333 /*              paramener VALUE.                                  */
 334 /* Parameters:                                                    */
 335 /*   node: NODE_ASN element pointer.                              */
 336 /*   value: the integer value that must be or-ed with the current */
 337 /*          value of field TYPE.                                  */
 338 /* Return: NODE pointer.                                          */
 339 /******************************************************************/
 340 node_asn *
 341 _asn1_mod_type(node_asn *node,unsigned int value)
 342 {
 343   if(node==NULL) return node;
 344   node->type|=value;
 345   return node;
 346 }
 347
 348
 349 /******************************************************************/
 350 /* Function : _asn1_remove_node                                   */
 351 /* Description: gets free the memory allocated for an NODE_ASN    */
 352 /*              element (not the elements pointed by it).         */
 353 /* Parameters:                                                    */
 354 /*   node: NODE_ASN element pointer.                              */
 355 /******************************************************************/
 356 void
 357 _asn1_remove_node(node_asn *node)
 358 {
 359   if(node==NULL) return;
 360
 361   if (node->name!=NULL)
 362           _asn1_free(node->name);
 363   if (node->value!=NULL)
 364           _asn1_free(node->value);
 365   _asn1_free(node);
 366 }
 367
 368 /**
 369  * asn1_find_up:
 370  * @node: NODE_ASN element pointer.
 371  *
 372  * Return the father of the NODE_ASN element.
 373  *
 374  * Return value: Return the father of the node, or %NULL if not found.
 375  **/
 376 ASN1_TYPE
 377 asn1_find_up(ASN1_TYPE node)
 378 {
 379   node_asn *p;
 380
 381   if(node==NULL) return NULL;
 382
 383   p=node;
 384
 385   while((p->left!=NULL) && (p->left->right==p)) p=p->left;
 386
 387   return p->left;
 388 }
 389
 390 /******************************************************************/
 391 /* Function : _asn1_delete_list                                   */
 392 /* Description: deletes the list elements (not the elements       */
 393 /*  pointed by them).                                             */
 394 /******************************************************************/
 395 void
 396 _asn1_delete_list(void)
 397 {
 398   list_type *listElement;
 399
 400   while(firstElement){
 401     listElement=firstElement;
 402     firstElement=firstElement->next;
 403     _asn1_free(listElement);
 404   }
 405 }
 406
 407 /******************************************************************/
 408 /* Function : _asn1_delete_list_and nodes                         */
 409 /* Description: deletes the list elements and the elements        */
 410 /*  pointed by them.                                              */
 411 /******************************************************************/
 412 void
 413 _asn1_delete_list_and_nodes(void)
 414 {
 415   list_type *listElement;
 416
 417   while(firstElement){
 418     listElement=firstElement;
 419     firstElement=firstElement->next;
 420     _asn1_remove_node(listElement->node);
 421     _asn1_free(listElement);
 422   }
 423 }
 424
 425
 426 char *
 427 _asn1_ltostr(long v,char *str)
 428 {
 429   long d,r;
 430   char temp[20];
 431   int count,k,start;
 432
 433   if(v<0){
 434     str[0]='-';
 435     start=1;
 436     v=-v;
 437   }
 438   else start=0;
 439
 440   count=0;
 441   do{
 442     d=v/10;
 443     r=v-d*10;
 444     temp[start+count]='0'+(char)r;
 445     count++;
 446     v=d;
 447   }while(v);
 448
 449   for(k=0;k<count;k++) str[k+start]=temp[start+count-k-1];
 450   str[count+start]=0;
 451   return str;
 452 }
 453
 454
 455 /******************************************************************/
 456 /* Function : _asn1_change_integer_value                          */
 457 /* Description: converts into DER coding the value assign to an   */
 458 /*   INTEGER constant.                                            */
 459 /* Parameters:                                                    */
 460 /*   node: root of an ASN1element.                                */
 461 /* Return:                                                        */
 462 /*   ASN1_ELEMENT_NOT_FOUND if NODE is NULL,                       */
 463 /*   otherwise ASN1_SUCCESS                                             */
 464 /******************************************************************/
 465 asn1_retCode
 466 _asn1_change_integer_value(ASN1_TYPE node)
 467 {
 468   node_asn *p;
 469   unsigned char val[SIZEOF_UNSIGNED_LONG_INT];
 470   unsigned char val2[SIZEOF_UNSIGNED_LONG_INT+1];
 471   int len;
 472
 473   if(node==NULL) return ASN1_ELEMENT_NOT_FOUND;
 474
 475   p=node;
 476   while(p){
 477     if((type_field(p->type)==TYPE_INTEGER) && (p->type&CONST_ASSIGN)){
 478       if(p->value){
 479         _asn1_convert_integer(p->value,val,sizeof(val), &len);
 480         asn1_octet_der(val,len,val2,&len);
 481         _asn1_set_value(p,val2,len);
 482       }
 483     }
 484
 485     if(p->down){
 486       p=p->down;
 487     }
 488     else{
 489       if(p==node) p=NULL;
 490       else if(p->right) p=p->right;
 491       else{
 492         while(1){
 493           p=asn1_find_up(p);
 494           if(p==node){
 495             p=NULL;
 496             break;
 497           }
 498           if(p->right){
 499             p=p->right;
 500             break;
 501           }
 502         }
 503       }
 504     }
 505   }
 506
 507   return ASN1_SUCCESS;
 508 }
 509
 510
 511 /******************************************************************/
 512 /* Function : _asn1_expand_object_id                              */
 513 /* Description: expand the IDs of an OBJECT IDENTIFIER constant.  */
 514 /* Parameters:                                                    */
 515 /*   node: root of an ASN1 element.                               */
 516 /* Return:                                                        */
 517 /*   ASN1_ELEMENT_NOT_FOUND if NODE is NULL,                       */
 518 /*   otherwise ASN1_SUCCESS                                             */
 519 /******************************************************************/
 520 asn1_retCode
 521 _asn1_expand_object_id(ASN1_TYPE node)
 522 {
 523   node_asn *p,*p2,*p3,*p4,*p5;
 524   char name_root[MAX_NAME_SIZE],name2[2*MAX_NAME_SIZE+1];
 525   int move, tlen;
 526
 527   if(node==NULL) return ASN1_ELEMENT_NOT_FOUND;
 528
 529   _asn1_str_cpy(name_root, sizeof(name_root), node->name);
 530
 531   p=node;
 532   move=DOWN;
 533
 534   while(!((p==node) && (move==UP))){
 535     if(move!=UP){
 536       if((type_field(p->type)==TYPE_OBJECT_ID) && (p->type&CONST_ASSIGN)){
 537         p2=p->down;
 538         if(p2 && (type_field(p2->type)==TYPE_CONSTANT)){
 539           if(p2->value && !isdigit(p2->value[0])){
 540             _asn1_str_cpy(name2, sizeof(name2), name_root);
 541             _asn1_str_cat(name2, sizeof(name2), ".");
 542             _asn1_str_cat(name2, sizeof(name2), p2->value);
 543             p3=asn1_find_node(node,name2);
 544             if(!p3 || (type_field(p3->type)!=TYPE_OBJECT_ID) ||
 545                !(p3->type&CONST_ASSIGN)) return ASN1_ELEMENT_NOT_FOUND;
 546             _asn1_set_down(p,p2->right);
 547             _asn1_remove_node(p2);
 548             p2=p;
 549             p4=p3->down;
 550             while(p4){
 551               if(type_field(p4->type)==TYPE_CONSTANT){
 552                 p5=_asn1_add_node_only(TYPE_CONSTANT);
 553                 _asn1_set_name(p5,p4->name);
 554                 tlen = strlen( p4->value);
 555                 if (tlen > 0)
 556                     _asn1_set_value(p5,p4->value,tlen+1);
 557                 if(p2==p){
 558                   _asn1_set_right(p5,p->down);
 559                   _asn1_set_down(p,p5);
 560                 }
 561                 else{
 562                   _asn1_set_right(p5,p2->right);
 563                   _asn1_set_right(p2,p5);
 564                 }
 565                 p2=p5;
 566               }
 567               p4=p4->right;
 568             }
 569             move=DOWN;
 570             continue;
 571           }
 572         }
 573       }
 574       move=DOWN;
 575     }
 576     else move=RIGHT;
 577
 578     if(move==DOWN){
 579       if(p->down) p=p->down;
 580       else move=RIGHT;
 581     }
 582
 583     if(p==node) {move=UP; continue;}
 584
 585     if(move==RIGHT){
 586       if(p->right) p=p->right;
 587       else move=UP;
 588     }
 589     if(move==UP) p=asn1_find_up(p);
 590   }
 591
 592
 593   /*******************************/
 594   /*       expand DEFAULT        */
 595   /*******************************/
 596   p=node;
 597   move=DOWN;
 598
 599   while(!((p==node) && (move==UP))){
 600     if(move!=UP){
 601       if((type_field(p->type)==TYPE_OBJECT_ID) &&
 602          (p->type&CONST_DEFAULT)){
 603         p2=p->down;
 604         if(p2 && (type_field(p2->type)==TYPE_DEFAULT)){
 605           _asn1_str_cpy(name2, sizeof(name2), name_root);
 606           _asn1_str_cat(name2, sizeof(name2), ".");
 607           _asn1_str_cat(name2, sizeof(name2), p2->value);
 608           p3=asn1_find_node(node,name2);
 609           if(!p3 || (type_field(p3->type)!=TYPE_OBJECT_ID) ||
 610              !(p3->type&CONST_ASSIGN)) return ASN1_ELEMENT_NOT_FOUND;
 611           p4=p3->down;
 612           name2[0]=0;
 613           while(p4){
 614             if(type_field(p4->type)==TYPE_CONSTANT){
 615               if(name2[0]) _asn1_str_cat(name2,sizeof(name2),".");
 616               _asn1_str_cat(name2,sizeof(name2),p4->value);
 617             }
 618             p4=p4->right;
 619           }
 620           tlen = strlen(name2);
 621           if (tlen > 0)
 622               _asn1_set_value(p2,name2,tlen+1);
 623         }
 624       }
 625       move=DOWN;
 626     }
 627     else move=RIGHT;
 628
 629     if(move==DOWN){
 630       if(p->down) p=p->down;
 631       else move=RIGHT;
 632     }
 633
 634     if(p==node) {move=UP; continue;}
 635
 636     if(move==RIGHT){
 637       if(p->right) p=p->right;
 638       else move=UP;
 639     }
 640     if(move==UP) p=asn1_find_up(p);
 641   }
 642
 643   return ASN1_SUCCESS;
 644 }
 645
 646
 647 /******************************************************************/
 648 /* Function : _asn1_type_set_config                               */
 649 /* Description: sets the CONST_SET and CONST_NOT_USED properties  */
 650 /*   in the fields of the SET elements.                           */
 651 /* Parameters:                                                    */
 652 /*   node: root of an ASN1 element.                               */
 653 /* Return:                                                        */
 654 /*   ASN1_ELEMENT_NOT_FOUND if NODE is NULL,                       */
 655 /*   otherwise ASN1_SUCCESS                                             */
 656 /******************************************************************/
 657 asn1_retCode
 658 _asn1_type_set_config(ASN1_TYPE node)
 659 {
 660   node_asn *p,*p2;
 661   int move;
 662
 663   if(node==NULL) return ASN1_ELEMENT_NOT_FOUND;
 664
 665   p=node;
 666   move=DOWN;
 667
 668   while(!((p==node) && (move==UP))){
 669     if(move!=UP){
 670       if(type_field(p->type)==TYPE_SET){
 671         p2=p->down;
 672         while(p2){
 673           if(type_field(p2->type)!=TYPE_TAG)
 674             p2->type|=CONST_SET|CONST_NOT_USED;
 675           p2=p2->right;
 676         }
 677       }
 678       move=DOWN;
 679     }
 680     else move=RIGHT;
 681
 682     if(move==DOWN){
 683       if(p->down) p=p->down;
 684       else move=RIGHT;
 685     }
 686
 687     if(p==node) {move=UP; continue;}
 688
 689     if(move==RIGHT){
 690       if(p->right) p=p->right;
 691       else move=UP;
 692     }
 693     if(move==UP) p=asn1_find_up(p);
 694   }
 695
 696   return ASN1_SUCCESS;
 697 }
 698
 699
 700 /******************************************************************/
 701 /* Function : _asn1_check_identifier                              */
 702 /* Description: checks the definitions of all the identifiers     */
 703 /*   and the first element of an OBJECT_ID (e.g. {pkix 0 4}).     */
 704 /*   The _asn1_identifierMissing global variable is filled if     */
 705 /*   necessary.                                                   */
 706 /* Parameters:                                                    */
 707 /*   node: root of an ASN1 element.                               */
 708 /* Return:                                                        */
 709 /*   ASN1_ELEMENT_NOT_FOUND      if NODE is NULL,                 */
 710 /*   ASN1_IDENTIFIER_NOT_FOUND   if an identifier is not defined, */
 711 /*   otherwise ASN1_SUCCESS                                       */
 712 /******************************************************************/
 713 asn1_retCode
 714 _asn1_check_identifier(ASN1_TYPE node)
 715 {
 716   node_asn *p,*p2;
 717   char name2[MAX_NAME_SIZE*2+2];
 718
 719   if(node==NULL) return ASN1_ELEMENT_NOT_FOUND;
 720
 721   p=node;
 722   while(p){
 723     if(type_field(p->type)==TYPE_IDENTIFIER){
 724       _asn1_str_cpy(name2, sizeof(name2), node->name);
 725       _asn1_str_cat(name2, sizeof(name2), ".");
 726       _asn1_str_cat(name2, sizeof(name2), p->value);
 727       p2=asn1_find_node(node,name2);
 728       if(p2==NULL){
 729         strcpy(_asn1_identifierMissing,p->value);
 730         return ASN1_IDENTIFIER_NOT_FOUND;
 731       }
 732     }
 733     else if((type_field(p->type)==TYPE_OBJECT_ID) &&
 734             (p->type&CONST_DEFAULT)){
 735       p2=p->down;
 736       if(p2 && (type_field(p2->type)==TYPE_DEFAULT)){
 737         _asn1_str_cpy(name2, sizeof(name2), node->name);
 738         _asn1_str_cat(name2, sizeof(name2), ".");
 739         _asn1_str_cat(name2, sizeof(name2), p2->value);
 740         strcpy(_asn1_identifierMissing,p2->value);
 741         p2=asn1_find_node(node,name2);
 742         if(!p2 || (type_field(p2->type)!=TYPE_OBJECT_ID) ||
 743            !(p2->type&CONST_ASSIGN))
 744           return ASN1_IDENTIFIER_NOT_FOUND;
 745         else
 746           _asn1_identifierMissing[0]=0;
 747       }
 748     }
 749     else if((type_field(p->type)==TYPE_OBJECT_ID) &&
 750             (p->type&CONST_ASSIGN)){
 751       p2=p->down;
 752       if(p2 && (type_field(p2->type)==TYPE_CONSTANT)){
 753         if(p2->value && !isdigit(p2->value[0])){
 754           _asn1_str_cpy(name2, sizeof(name2), node->name);
 755           _asn1_str_cat(name2, sizeof(name2), ".");
 756           _asn1_str_cat(name2, sizeof(name2), p2->value);
 757           strcpy(_asn1_identifierMissing,p2->value);
 758           p2=asn1_find_node(node,name2);
 759           if(!p2 || (type_field(p2->type)!=TYPE_OBJECT_ID) ||
 760              !(p2->type&CONST_ASSIGN))
 761             return ASN1_IDENTIFIER_NOT_FOUND;
 762           else
 763             _asn1_identifierMissing[0]=0;
 764         }
 765       }
 766     }
 767
 768     if(p->down){
 769       p=p->down;
 770     }
 771     else if(p->right) p=p->right;
 772     else{
 773       while(1){
 774         p=asn1_find_up(p);
 775         if(p==node){
 776           p=NULL;
 777           break;
 778         }
 779         if(p->right){
 780           p=p->right;
 781           break;
 782         }
 783       }
 784     }
 785   }
 786
 787   return ASN1_SUCCESS;
 788 }
 789
 790
 791 /******************************************************************/
 792 /* Function : _asn1_set_default_tag                               */
 793 /* Description: sets the default IMPLICIT or EXPLICIT property in */
 794 /*   the tagged elements that don't have this declaration.        */
 795 /* Parameters:                                                    */
 796 /*   node: pointer to a DEFINITIONS element.                      */
 797 /* Return:                                                        */
 798 /*   ASN1_ELEMENT_NOT_FOUND if NODE is NULL or not a pointer to   */
 799 /*     a DEFINITIONS element,                                     */
 800 /*   otherwise ASN1_SUCCESS                                       */
 801 /******************************************************************/
 802 asn1_retCode
 803 _asn1_set_default_tag(ASN1_TYPE node)
 804 {
 805   node_asn *p;
 806
 807   if((node==NULL) || (type_field(node->type)!=TYPE_DEFINITIONS))
 808     return ASN1_ELEMENT_NOT_FOUND;
 809
 810   p=node;
 811   while(p){
 812     if((type_field(p->type)==TYPE_TAG) &&
 813             !(p->type&CONST_EXPLICIT) &&
 814             !(p->type&CONST_IMPLICIT)){
 815       if(node->type&CONST_EXPLICIT) p->type|=CONST_EXPLICIT;
 816       else p->type|=CONST_IMPLICIT;
 817     }
 818
 819     if(p->down){
 820       p=p->down;
 821     }
 822     else if(p->right) p=p->right;
 823     else{
 824       while(1){
 825           p=asn1_find_up(p);
 826           if(p==node){
 827             p=NULL;
 828             break;
 829           }
 830           if(p->right){
 831             p=p->right;
 832             break;
 833           }
 834       }
 835     }
 836   }
 837
 838   return ASN1_SUCCESS;
 839 }
 840
 841
 842
 843 static const char*
 844 parse_version_number( const char *s, int *number )
 845 {
 846     int val = 0;
 847
 848     if( *s == '0' && isdigit(s[1]) )
 849         return NULL; /* leading zeros are not allowed */
 850     for ( ; isdigit(*s); s++ ) {
 851         val *= 10;
 852         val += *s - '0';
 853     }
 854     *number = val;
 855     return val < 0? NULL : s;
 856 }
 857
 858 /* The parse version functions were copied from libgcrypt.
 859  */
 860 static const char *
 861 parse_version_string( const char *s, int *major, int *minor, int *micro )
 862 {
 863     s = parse_version_number( s, major );
 864     if( !s || *s != '.' )
 865         return NULL;
 866     s++;
 867     s = parse_version_number( s, minor );
 868     if( !s || *s != '.' )
 869         return NULL;
 870     s++;
 871     s = parse_version_number( s, micro );
 872     if( !s )
 873         return NULL;
 874     return s; /* patchlevel */
 875 }
 876
 877 /**
 878  * asn1_check_version - check for library version
 879  * @req_version: Required version number, or NULL.
 880  *
 881  * Check that the the version of the library is at minimum the
 882  * requested one and return the version string; return %NULL if the
 883  * condition is not satisfied.  If a %NULL is passed to this function,
 884  * no check is done, but the version string is simply returned.
 885  *
 886  * See %LIBTASN1_VERSION for a suitable @req_version string.
 887  *
 888  * Return value: Version string of run-time library, or %NULL if the
 889  *   run-time library does not meet the required version number.
 890  */
 891 const char *
 892 asn1_check_version( const char *req_version )
 893 {
 894     const char *ver = LIBTASN1_VERSION;
 895     int my_major, my_minor, my_micro;
 896     int rq_major, rq_minor, rq_micro;
 897     const char *my_plvl, *rq_plvl;
 898
 899     if ( !req_version )
 900         return ver;
 901
 902     my_plvl = parse_version_string( ver, &my_major, &my_minor, &my_micro );
 903     if ( !my_plvl )
 904         return NULL;  /* very strange our own version is bogus */
 905     rq_plvl = parse_version_string( req_version, &rq_major, &rq_minor,
 906                                                                 &rq_micro );
 907     if ( !rq_plvl )
 908         return NULL;  /* req version string is invalid */
 909
 910     if ( my_major > rq_major
 911         || (my_major == rq_major && my_minor > rq_minor)
 912         || (my_major == rq_major && my_minor == rq_minor
 913                                  && my_micro > rq_micro)
 914         || (my_major == rq_major && my_minor == rq_minor
 915                                  && my_micro == rq_micro
 916                                  && strcmp( my_plvl, rq_plvl ) >= 0) ) {
 917         return ver;
 918     }
 919     return NULL;
 920 }