1 /* decode.c - ber input decoding routines */
3 * Copyright (c) 1990 Regents of the University of Michigan.
6 * Redistribution and use in source and binary forms are permitted
7 * provided that this notice is preserved and that due credit is given
8 * to the University of Michigan at Ann Arbor. The name of the University
9 * may not be used to endorse or promote products derived from this
10 * software without specific prior written permission. This software
11 * is provided ``as is'' without express or implied warranty.
21 #if defined(NeXT) || defined(VMS) || defined(__FreeBSD__)
23 #else /* next || vms || freebsd */
25 #endif /* next || vms || freebsd */
26 #if defined(BC31) || defined(_WIN32)
28 #else /* BC31 || _WIN32 */
30 #endif /* BC31 || _WIN32 */
31 #include <sys/types.h>
32 #include <sys/socket.h>
33 #include <netinet/in.h>
39 #if defined( DOS ) || defined( _WIN32 )
51 static int ber_getnint( BerElement *ber, long *num, int len );
52 #endif /* NEEDPROTOS */
55 /* return the tag - LBER_DEFAULT returned means trouble */
57 ber_get_tag( BerElement *ber )
64 if ( ber_read( ber, (char *) &xbyte, 1 ) != 1 )
65 return( LBER_DEFAULT );
67 if ( (xbyte & LBER_BIG_TAG_MASK) != LBER_BIG_TAG_MASK )
68 return( (unsigned long) xbyte );
72 for ( i = 1; i < sizeof(long); i++ ) {
73 if ( ber_read( ber, (char *) &xbyte, 1 ) != 1 )
74 return( LBER_DEFAULT );
78 if ( ! (xbyte & LBER_MORE_TAG_MASK) )
83 if ( i == sizeof(long) )
84 return( LBER_DEFAULT );
86 /* want leading, not trailing 0's */
87 return( tag >> (sizeof(long) - i - 1) );
91 ber_skip_tag( BerElement *ber, unsigned long *len )
99 * Any ber element looks like this: tag length contents.
100 * Assuming everything's ok, we return the tag byte (we
101 * can assume a single byte), and return the length in len.
104 * 1) definite lengths
105 * 2) primitive encodings used whenever possible
109 * First, we read the tag.
112 if ( (tag = ber_get_tag( ber )) == LBER_DEFAULT )
113 return( LBER_DEFAULT );
116 * Next, read the length. The first byte contains the length of
117 * the length. If bit 8 is set, the length is the long form,
118 * otherwise it's the short form. We don't allow a length that's
119 * greater than what we can hold in an unsigned long.
123 if ( ber_read( ber, (char *) &lc, 1 ) != 1 )
124 return( LBER_DEFAULT );
126 noctets = (lc & 0x7f);
127 if ( noctets > sizeof(unsigned long) )
128 return( LBER_DEFAULT );
129 diff = sizeof(unsigned long) - noctets;
130 if ( ber_read( ber, (char *) &netlen + diff, noctets )
132 return( LBER_DEFAULT );
133 *len = LBER_NTOHL( netlen );
142 ber_peek_tag( BerElement *ber, unsigned long *len )
148 tag = ber_skip_tag( ber, len );
155 ber_getnint( BerElement *ber, long *num, int len )
162 * The tag and length have already been stripped off. We should
163 * be sitting right before len bytes of 2's complement integer,
164 * ready to be read straight into an int. We may have to sign
165 * extend after we read it in.
168 if ( len > sizeof(long) )
172 diff = sizeof(long) - len;
173 /* read into the low-order bytes of netnum */
174 if ( ber_read( ber, ((char *) &netnum) + diff, len ) != len )
177 /* sign extend if necessary */
178 p = (char *) &netnum;
179 sign = (0x80 & *(p+diff) );
180 if ( sign && len < sizeof(long) ) {
181 for ( i = 0; i < diff; i++ ) {
185 *num = LBER_NTOHL( netnum );
191 ber_get_int( BerElement *ber, long *num )
193 unsigned long tag, len;
195 if ( (tag = ber_skip_tag( ber, &len )) == LBER_DEFAULT )
196 return( LBER_DEFAULT );
198 if ( ber_getnint( ber, num, (int)len ) != len )
199 return( LBER_DEFAULT );
205 ber_get_stringb( BerElement *ber, char *buf, unsigned long *len )
207 unsigned long datalen, tag;
208 #ifdef STR_TRANSLATION
210 #endif /* STR_TRANSLATION */
212 if ( (tag = ber_skip_tag( ber, &datalen )) == LBER_DEFAULT )
213 return( LBER_DEFAULT );
214 if ( datalen > (*len - 1) )
215 return( LBER_DEFAULT );
217 if ( ber_read( ber, buf, datalen ) != datalen )
218 return( LBER_DEFAULT );
222 #ifdef STR_TRANSLATION
223 if ( datalen > 0 && ( ber->ber_options & LBER_TRANSLATE_STRINGS ) != 0
224 && ber->ber_decode_translate_proc != NULL ) {
227 if ( (*(ber->ber_decode_translate_proc))( &transbuf, &datalen,
229 return( LBER_DEFAULT );
231 if ( datalen > *len ) {
233 return( LBER_DEFAULT );
235 SAFEMEMCPY( buf, transbuf, datalen );
239 #endif /* STR_TRANSLATION */
246 ber_get_stringa( BerElement *ber, char **buf )
248 unsigned long datalen, tag;
250 if ( (tag = ber_skip_tag( ber, &datalen )) == LBER_DEFAULT )
251 return( LBER_DEFAULT );
253 if ( (*buf = (char *) malloc( (size_t)datalen + 1 )) == NULL )
254 return( LBER_DEFAULT );
256 if ( ber_read( ber, *buf, datalen ) != datalen )
257 return( LBER_DEFAULT );
258 (*buf)[datalen] = '\0';
260 #ifdef STR_TRANSLATION
261 if ( datalen > 0 && ( ber->ber_options & LBER_TRANSLATE_STRINGS ) != 0
262 && ber->ber_decode_translate_proc != NULL ) {
264 if ( (*(ber->ber_decode_translate_proc))( buf, &datalen, 1 )
267 return( LBER_DEFAULT );
270 #endif /* STR_TRANSLATION */
276 ber_get_stringal( BerElement *ber, struct berval **bv )
278 unsigned long len, tag;
280 if ( (*bv = (struct berval *) malloc( sizeof(struct berval) )) == NULL )
281 return( LBER_DEFAULT );
283 if ( (tag = ber_skip_tag( ber, &len )) == LBER_DEFAULT )
284 return( LBER_DEFAULT );
286 if ( ((*bv)->bv_val = (char *) malloc( (size_t)len + 1 )) == NULL )
287 return( LBER_DEFAULT );
289 if ( ber_read( ber, (*bv)->bv_val, len ) != len )
290 return( LBER_DEFAULT );
291 ((*bv)->bv_val)[len] = '\0';
294 #ifdef STR_TRANSLATION
295 if ( len > 0 && ( ber->ber_options & LBER_TRANSLATE_STRINGS ) != 0
296 && ber->ber_decode_translate_proc != NULL ) {
298 if ( (*(ber->ber_decode_translate_proc))( &((*bv)->bv_val),
300 free( (*bv)->bv_val );
301 return( LBER_DEFAULT );
303 (*bv)->bv_len = len - 1;
305 #endif /* STR_TRANSLATION */
311 ber_get_bitstringa( BerElement *ber, char **buf, unsigned long *blen )
313 unsigned long datalen, tag;
314 unsigned char unusedbits;
316 if ( (tag = ber_skip_tag( ber, &datalen )) == LBER_DEFAULT )
317 return( LBER_DEFAULT );
320 if ( (*buf = (char *) malloc( (size_t)datalen )) == NULL )
321 return( LBER_DEFAULT );
323 if ( ber_read( ber, (char *)&unusedbits, 1 ) != 1 )
324 return( LBER_DEFAULT );
326 if ( ber_read( ber, *buf, datalen ) != datalen )
327 return( LBER_DEFAULT );
329 *blen = datalen * 8 - unusedbits;
334 ber_get_null( BerElement *ber )
336 unsigned long len, tag;
338 if ( (tag = ber_skip_tag( ber, &len )) == LBER_DEFAULT )
339 return( LBER_DEFAULT );
342 return( LBER_DEFAULT );
348 ber_get_boolean( BerElement *ber, int *boolval )
353 rc = ber_get_int( ber, &longbool );
360 ber_first_element( BerElement *ber, unsigned long *len, char **last )
362 /* skip the sequence header, use the len to mark where to stop */
363 if ( ber_skip_tag( ber, len ) == LBER_DEFAULT ) {
364 return( LBER_DEFAULT );
367 *last = ber->ber_ptr + *len;
369 if ( *last == ber->ber_ptr ) {
370 return( LBER_DEFAULT );
373 return( ber_peek_tag( ber, len ) );
377 ber_next_element( BerElement *ber, unsigned long *len, char *last )
379 if ( ber->ber_ptr == last ) {
380 return( LBER_DEFAULT );
383 return( ber_peek_tag( ber, len ) );
389 #if defined( MACOS ) || defined( BC31 ) || defined( _WIN32 )
390 BerElement *ber, char *fmt, ... )
397 #if !defined( MACOS ) && !defined( BC31 ) && !defined( _WIN32 )
402 char *s, **ss, ***sss;
403 struct berval ***bv, **bvp, *bval;
408 #if defined( MACOS ) || defined( BC31 ) || defined( _WIN32 )
412 ber = va_arg( ap, BerElement * );
413 fmt = va_arg( ap, char * );
417 if ( lber_debug & 64 ) {
418 fprintf( stderr, "ber_scanf fmt (%s) ber:\n", fmt );
423 for ( rc = 0; *fmt && rc != LBER_DEFAULT; fmt++ ) {
425 case 'a': /* octet string - allocate storage as needed */
426 ss = va_arg( ap, char ** );
427 rc = ber_get_stringa( ber, ss );
430 case 'b': /* boolean */
431 i = va_arg( ap, int * );
432 rc = ber_get_boolean( ber, i );
435 case 'e': /* enumerated */
437 l = va_arg( ap, long * );
438 rc = ber_get_int( ber, l );
441 case 'l': /* length of next item */
442 l = va_arg( ap, long * );
443 rc = ber_peek_tag( ber, (unsigned long *)l );
447 rc = ber_get_null( ber );
450 case 's': /* octet string - in a buffer */
451 s = va_arg( ap, char * );
452 l = va_arg( ap, long * );
453 rc = ber_get_stringb( ber, s, (unsigned long *)l );
456 case 'o': /* octet string in a supplied berval */
457 bval = va_arg( ap, struct berval * );
458 ber_peek_tag( ber, &bval->bv_len );
459 rc = ber_get_stringa( ber, &bval->bv_val );
462 case 'O': /* octet string - allocate & include length */
463 bvp = va_arg( ap, struct berval ** );
464 rc = ber_get_stringal( ber, bvp );
467 case 'B': /* bit string - allocate storage as needed */
468 ss = va_arg( ap, char ** );
469 l = va_arg( ap, long * ); /* for length, in bits */
470 rc = ber_get_bitstringa( ber, ss, (unsigned long *)l );
473 case 't': /* tag of next item */
474 i = va_arg( ap, int * );
475 *i = rc = ber_peek_tag( ber, &len );
478 case 'T': /* skip tag of next item */
479 i = va_arg( ap, int * );
480 *i = rc = ber_skip_tag( ber, &len );
483 case 'v': /* sequence of strings */
484 sss = va_arg( ap, char *** );
487 for ( tag = ber_first_element( ber, &len, &last );
488 tag != LBER_DEFAULT && rc != LBER_DEFAULT;
489 tag = ber_next_element( ber, &len, last ) ) {
490 if ( *sss == NULL ) {
491 *sss = (char **) malloc(
492 2 * sizeof(char *) );
494 *sss = (char **) realloc( *sss,
495 (j + 2) * sizeof(char *) );
497 rc = ber_get_stringa( ber, &((*sss)[j]) );
504 case 'V': /* sequence of strings + lengths */
505 bv = va_arg( ap, struct berval *** );
508 for ( tag = ber_first_element( ber, &len, &last );
509 tag != LBER_DEFAULT && rc != LBER_DEFAULT;
510 tag = ber_next_element( ber, &len, last ) ) {
512 *bv = (struct berval **) malloc(
513 2 * sizeof(struct berval *) );
515 *bv = (struct berval **) realloc( *bv,
516 (j + 2) * sizeof(struct berval *) );
518 rc = ber_get_stringal( ber, &((*bv)[j]) );
525 case 'x': /* skip the next element - whatever it is */
526 if ( (rc = ber_skip_tag( ber, &len )) == LBER_DEFAULT )
531 case '{': /* begin sequence */
532 case '[': /* begin set */
533 if ( *(fmt + 1) != 'v' && *(fmt + 1) != 'V' )
534 rc = ber_skip_tag( ber, &len );
537 case '}': /* end sequence */
538 case ']': /* end set */
542 #ifndef NO_USERINTERFACE
543 fprintf( stderr, "unknown fmt %c\n", *fmt );
544 #endif /* NO_USERINTERFACE */
556 ber_bvfree( struct berval *bv )
558 if ( bv->bv_val != NULL )
564 ber_bvecfree( struct berval **bv )
568 for ( i = 0; bv[i] != NULL; i++ )
574 ber_bvdup( struct berval *bv )
578 if ( (new = (struct berval *) malloc( sizeof(struct berval) ))
582 if ( (new->bv_val = (char *) malloc( bv->bv_len + 1 )) == NULL ) {
585 SAFEMEMCPY( new->bv_val, bv->bv_val, (size_t) bv->bv_len );
586 new->bv_val[bv->bv_len] = '\0';
587 new->bv_len = bv->bv_len;
593 #ifdef STR_TRANSLATION
595 ber_set_string_translators( BerElement *ber, BERTranslateProc encode_proc,
596 BERTranslateProc decode_proc )
598 ber->ber_encode_translate_proc = encode_proc;
599 ber->ber_decode_translate_proc = decode_proc;
601 #endif /* STR_TRANSLATION */