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.
14 #define DISABLE_BRIDGE /* disable LDAP_BRIDGE code */
26 #include <ac/string.h>
32 #include <sys/types.h>
33 #include <sys/socket.h>
34 #include <netinet/in.h>
39 #if defined( DOS ) || defined( _WIN32 )
51 static int ber_getnint LDAP_P(( BerElement *ber, long *num, int len ));
53 /* return the tag - LBER_DEFAULT returned means trouble */
55 ber_get_tag( BerElement *ber )
62 if ( ber_read( ber, (char *) &xbyte, 1 ) != 1 )
63 return( LBER_DEFAULT );
65 if ( (xbyte & LBER_BIG_TAG_MASK) != LBER_BIG_TAG_MASK )
66 return( (unsigned long) xbyte );
70 for ( i = 1; i < sizeof(long); i++ ) {
71 if ( ber_read( ber, (char *) &xbyte, 1 ) != 1 )
72 return( LBER_DEFAULT );
76 if ( ! (xbyte & LBER_MORE_TAG_MASK) )
81 if ( i == sizeof(long) )
82 return( LBER_DEFAULT );
84 /* want leading, not trailing 0's */
85 return( tag >> (sizeof(long) - i - 1) );
89 ber_skip_tag( BerElement *ber, unsigned long *len )
97 * Any ber element looks like this: tag length contents.
98 * Assuming everything's ok, we return the tag byte (we
99 * can assume a single byte), and return the length in len.
102 * 1) definite lengths
103 * 2) primitive encodings used whenever possible
107 * First, we read the tag.
110 if ( (tag = ber_get_tag( ber )) == LBER_DEFAULT )
111 return( LBER_DEFAULT );
114 * Next, read the length. The first byte contains the length of
115 * the length. If bit 8 is set, the length is the long form,
116 * otherwise it's the short form. We don't allow a length that's
117 * greater than what we can hold in an unsigned long.
121 if ( ber_read( ber, (char *) &lc, 1 ) != 1 )
122 return( LBER_DEFAULT );
124 noctets = (lc & 0x7f);
125 if ( noctets > sizeof(unsigned long) )
126 return( LBER_DEFAULT );
127 diff = sizeof(unsigned long) - noctets;
128 if ( ber_read( ber, (char *) &netlen + diff, noctets )
130 return( LBER_DEFAULT );
131 *len = LBER_NTOHL( netlen );
140 ber_peek_tag( BerElement *ber, unsigned long *len )
146 tag = ber_skip_tag( ber, len );
153 ber_getnint( BerElement *ber, long *num, int len )
160 * The tag and length have already been stripped off. We should
161 * be sitting right before len bytes of 2's complement integer,
162 * ready to be read straight into an int. We may have to sign
163 * extend after we read it in.
166 if ( len > sizeof(long) )
170 diff = sizeof(long) - len;
171 /* read into the low-order bytes of netnum */
172 if ( ber_read( ber, ((char *) &netnum) + diff, len ) != len )
175 /* sign extend if necessary */
176 p = (char *) &netnum;
177 sign = (0x80 & *(p+diff) );
178 if ( sign && len < sizeof(long) ) {
179 for ( i = 0; i < diff; i++ ) {
183 *num = LBER_NTOHL( netnum );
189 ber_get_int( BerElement *ber, long *num )
191 unsigned long tag, len;
193 if ( (tag = ber_skip_tag( ber, &len )) == LBER_DEFAULT )
194 return( LBER_DEFAULT );
196 if ( ber_getnint( ber, num, (int)len ) != len )
197 return( LBER_DEFAULT );
203 ber_get_stringb( BerElement *ber, char *buf, unsigned long *len )
205 unsigned long datalen, tag;
206 #ifdef STR_TRANSLATION
208 #endif /* STR_TRANSLATION */
210 if ( (tag = ber_skip_tag( ber, &datalen )) == LBER_DEFAULT )
211 return( LBER_DEFAULT );
212 if ( datalen > (*len - 1) )
213 return( LBER_DEFAULT );
215 if ( ber_read( ber, buf, datalen ) != datalen )
216 return( LBER_DEFAULT );
220 #ifdef STR_TRANSLATION
221 if ( datalen > 0 && ( ber->ber_options & LBER_TRANSLATE_STRINGS ) != 0
222 && ber->ber_decode_translate_proc != NULL ) {
225 if ( (*(ber->ber_decode_translate_proc))( &transbuf, &datalen,
227 return( LBER_DEFAULT );
229 if ( datalen > *len ) {
231 return( LBER_DEFAULT );
233 SAFEMEMCPY( buf, transbuf, datalen );
237 #endif /* STR_TRANSLATION */
244 ber_get_stringa( BerElement *ber, char **buf )
246 unsigned long datalen, tag;
248 if ( (tag = ber_skip_tag( ber, &datalen )) == LBER_DEFAULT )
249 return( LBER_DEFAULT );
251 if ( (*buf = (char *) malloc( (size_t)datalen + 1 )) == NULL )
252 return( LBER_DEFAULT );
254 if ( ber_read( ber, *buf, datalen ) != datalen )
255 return( LBER_DEFAULT );
256 (*buf)[datalen] = '\0';
258 #ifdef STR_TRANSLATION
259 if ( datalen > 0 && ( ber->ber_options & LBER_TRANSLATE_STRINGS ) != 0
260 && ber->ber_decode_translate_proc != NULL ) {
262 if ( (*(ber->ber_decode_translate_proc))( buf, &datalen, 1 )
265 return( LBER_DEFAULT );
268 #endif /* STR_TRANSLATION */
274 ber_get_stringal( BerElement *ber, struct berval **bv )
276 unsigned long len, tag;
278 if ( (*bv = (struct berval *) malloc( sizeof(struct berval) )) == NULL )
279 return( LBER_DEFAULT );
281 if ( (tag = ber_skip_tag( ber, &len )) == LBER_DEFAULT )
282 return( LBER_DEFAULT );
284 if ( ((*bv)->bv_val = (char *) malloc( (size_t)len + 1 )) == NULL )
285 return( LBER_DEFAULT );
287 if ( ber_read( ber, (*bv)->bv_val, len ) != len )
288 return( LBER_DEFAULT );
289 ((*bv)->bv_val)[len] = '\0';
292 #ifdef STR_TRANSLATION
293 if ( len > 0 && ( ber->ber_options & LBER_TRANSLATE_STRINGS ) != 0
294 && ber->ber_decode_translate_proc != NULL ) {
296 if ( (*(ber->ber_decode_translate_proc))( &((*bv)->bv_val),
298 free( (*bv)->bv_val );
299 return( LBER_DEFAULT );
301 (*bv)->bv_len = len - 1;
303 #endif /* STR_TRANSLATION */
309 ber_get_bitstringa( BerElement *ber, char **buf, unsigned long *blen )
311 unsigned long datalen, tag;
312 unsigned char unusedbits;
314 if ( (tag = ber_skip_tag( ber, &datalen )) == LBER_DEFAULT )
315 return( LBER_DEFAULT );
318 if ( (*buf = (char *) malloc( (size_t)datalen )) == NULL )
319 return( LBER_DEFAULT );
321 if ( ber_read( ber, (char *)&unusedbits, 1 ) != 1 )
322 return( LBER_DEFAULT );
324 if ( ber_read( ber, *buf, datalen ) != datalen )
325 return( LBER_DEFAULT );
327 *blen = datalen * 8 - unusedbits;
332 ber_get_null( BerElement *ber )
334 unsigned long len, tag;
336 if ( (tag = ber_skip_tag( ber, &len )) == LBER_DEFAULT )
337 return( LBER_DEFAULT );
340 return( LBER_DEFAULT );
346 ber_get_boolean( BerElement *ber, int *boolval )
351 rc = ber_get_int( ber, &longbool );
358 ber_first_element( BerElement *ber, unsigned long *len, char **last )
360 /* skip the sequence header, use the len to mark where to stop */
361 if ( ber_skip_tag( ber, len ) == LBER_DEFAULT ) {
362 return( LBER_DEFAULT );
365 *last = ber->ber_ptr + *len;
367 if ( *last == ber->ber_ptr ) {
368 return( LBER_DEFAULT );
371 return( ber_peek_tag( ber, len ) );
375 ber_next_element( BerElement *ber, unsigned long *len, char *last )
377 if ( ber->ber_ptr == last ) {
378 return( LBER_DEFAULT );
381 return( ber_peek_tag( ber, len ) );
388 ( BerElement *ber, char *fmt, ... )
400 char *s, **ss, ***sss;
401 struct berval ***bv, **bvp, *bval;
410 ber = va_arg( ap, BerElement * );
411 fmt = va_arg( ap, char * );
415 if ( lber_debug & 64 ) {
416 fprintf( stderr, "ber_scanf fmt (%s) ber:\n", fmt );
421 for ( rc = 0; *fmt && rc != LBER_DEFAULT; fmt++ ) {
423 case 'a': /* octet string - allocate storage as needed */
424 ss = va_arg( ap, char ** );
425 rc = ber_get_stringa( ber, ss );
428 case 'b': /* boolean */
429 i = va_arg( ap, int * );
430 rc = ber_get_boolean( ber, i );
433 case 'e': /* enumerated */
435 l = va_arg( ap, long * );
436 rc = ber_get_int( ber, l );
439 case 'l': /* length of next item */
440 l = va_arg( ap, long * );
441 rc = ber_peek_tag( ber, (unsigned long *)l );
445 rc = ber_get_null( ber );
448 case 's': /* octet string - in a buffer */
449 s = va_arg( ap, char * );
450 l = va_arg( ap, long * );
451 rc = ber_get_stringb( ber, s, (unsigned long *)l );
454 case 'o': /* octet string in a supplied berval */
455 bval = va_arg( ap, struct berval * );
456 ber_peek_tag( ber, &bval->bv_len );
457 rc = ber_get_stringa( ber, &bval->bv_val );
460 case 'O': /* octet string - allocate & include length */
461 bvp = va_arg( ap, struct berval ** );
462 rc = ber_get_stringal( ber, bvp );
465 case 'B': /* bit string - allocate storage as needed */
466 ss = va_arg( ap, char ** );
467 l = va_arg( ap, long * ); /* for length, in bits */
468 rc = ber_get_bitstringa( ber, ss, (unsigned long *)l );
471 case 't': /* tag of next item */
472 i = va_arg( ap, int * );
473 *i = rc = ber_peek_tag( ber, &len );
476 case 'T': /* skip tag of next item */
477 i = va_arg( ap, int * );
478 *i = rc = ber_skip_tag( ber, &len );
481 case 'v': /* sequence of strings */
482 sss = va_arg( ap, char *** );
485 for ( tag = ber_first_element( ber, &len, &last );
486 tag != LBER_DEFAULT && rc != LBER_DEFAULT;
487 tag = ber_next_element( ber, &len, last ) ) {
488 if ( *sss == NULL ) {
489 *sss = (char **) malloc(
490 2 * sizeof(char *) );
492 *sss = (char **) realloc( *sss,
493 (j + 2) * sizeof(char *) );
495 rc = ber_get_stringa( ber, &((*sss)[j]) );
502 case 'V': /* sequence of strings + lengths */
503 bv = va_arg( ap, struct berval *** );
506 for ( tag = ber_first_element( ber, &len, &last );
507 tag != LBER_DEFAULT && rc != LBER_DEFAULT;
508 tag = ber_next_element( ber, &len, last ) ) {
510 *bv = (struct berval **) malloc(
511 2 * sizeof(struct berval *) );
513 *bv = (struct berval **) realloc( *bv,
514 (j + 2) * sizeof(struct berval *) );
516 rc = ber_get_stringal( ber, &((*bv)[j]) );
523 case 'x': /* skip the next element - whatever it is */
524 if ( (rc = ber_skip_tag( ber, &len )) == LBER_DEFAULT )
529 case '{': /* begin sequence */
530 case '[': /* begin set */
531 if ( *(fmt + 1) != 'v' && *(fmt + 1) != 'V' )
532 rc = ber_skip_tag( ber, &len );
535 case '}': /* end sequence */
536 case ']': /* end set */
541 fprintf( stderr, "unknown fmt %c\n", *fmt );
542 #endif /* LDAP_LIBUI */
554 ber_bvfree( struct berval *bv )
556 if ( bv->bv_val != NULL )
562 ber_bvecfree( struct berval **bv )
566 for ( i = 0; bv[i] != NULL; i++ )
572 ber_bvdup( struct berval *bv )
576 if ( (new = (struct berval *) malloc( sizeof(struct berval) ))
580 if ( (new->bv_val = (char *) malloc( bv->bv_len + 1 )) == NULL ) {
583 SAFEMEMCPY( new->bv_val, bv->bv_val, (size_t) bv->bv_len );
584 new->bv_val[bv->bv_len] = '\0';
585 new->bv_len = bv->bv_len;
591 #ifdef STR_TRANSLATION
593 ber_set_string_translators( BerElement *ber, BERTranslateProc encode_proc,
594 BERTranslateProc decode_proc )
596 ber->ber_encode_translate_proc = encode_proc;
597 ber->ber_decode_translate_proc = decode_proc;
599 #endif /* STR_TRANSLATION */