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 )
49 static int ber_getnint LDAP_P(( BerElement *ber, long *num, int len ));
51 /* return the tag - LBER_DEFAULT returned means trouble */
53 ber_get_tag( BerElement *ber )
60 if ( ber_read( ber, (char *) &xbyte, 1 ) != 1 )
61 return( LBER_DEFAULT );
63 if ( (xbyte & LBER_BIG_TAG_MASK) != LBER_BIG_TAG_MASK )
64 return( (unsigned long) xbyte );
68 for ( i = 1; i < sizeof(long); i++ ) {
69 if ( ber_read( ber, (char *) &xbyte, 1 ) != 1 )
70 return( LBER_DEFAULT );
74 if ( ! (xbyte & LBER_MORE_TAG_MASK) )
79 if ( i == sizeof(long) )
80 return( LBER_DEFAULT );
82 /* want leading, not trailing 0's */
83 return( tag >> (sizeof(long) - i - 1) );
87 ber_skip_tag( BerElement *ber, unsigned long *len )
95 * Any ber element looks like this: tag length contents.
96 * Assuming everything's ok, we return the tag byte (we
97 * can assume a single byte), and return the length in len.
100 * 1) definite lengths
101 * 2) primitive encodings used whenever possible
105 * First, we read the tag.
108 if ( (tag = ber_get_tag( ber )) == LBER_DEFAULT )
109 return( LBER_DEFAULT );
112 * Next, read the length. The first byte contains the length of
113 * the length. If bit 8 is set, the length is the long form,
114 * otherwise it's the short form. We don't allow a length that's
115 * greater than what we can hold in an unsigned long.
119 if ( ber_read( ber, (char *) &lc, 1 ) != 1 )
120 return( LBER_DEFAULT );
122 noctets = (lc & 0x7f);
123 if ( noctets > sizeof(unsigned long) )
124 return( LBER_DEFAULT );
125 diff = sizeof(unsigned long) - noctets;
126 if ( ber_read( ber, (char *) &netlen + diff, noctets )
128 return( LBER_DEFAULT );
129 *len = LBER_NTOHL( netlen );
138 ber_peek_tag( BerElement *ber, unsigned long *len )
144 tag = ber_skip_tag( ber, len );
151 ber_getnint( BerElement *ber, long *num, int len )
158 * The tag and length have already been stripped off. We should
159 * be sitting right before len bytes of 2's complement integer,
160 * ready to be read straight into an int. We may have to sign
161 * extend after we read it in.
164 if ( len > sizeof(long) )
168 diff = sizeof(long) - len;
169 /* read into the low-order bytes of netnum */
170 if ( ber_read( ber, ((char *) &netnum) + diff, len ) != len )
173 /* sign extend if necessary */
174 p = (char *) &netnum;
175 sign = (0x80 & *(p+diff) );
176 if ( sign && len < sizeof(long) ) {
177 for ( i = 0; i < diff; i++ ) {
181 *num = LBER_NTOHL( netnum );
187 ber_get_int( BerElement *ber, long *num )
189 unsigned long tag, len;
191 if ( (tag = ber_skip_tag( ber, &len )) == LBER_DEFAULT )
192 return( LBER_DEFAULT );
194 if ( ber_getnint( ber, num, (int)len ) != len )
195 return( LBER_DEFAULT );
201 ber_get_stringb( BerElement *ber, char *buf, unsigned long *len )
203 unsigned long datalen, tag;
204 #ifdef STR_TRANSLATION
206 #endif /* STR_TRANSLATION */
208 if ( (tag = ber_skip_tag( ber, &datalen )) == LBER_DEFAULT )
209 return( LBER_DEFAULT );
210 if ( datalen > (*len - 1) )
211 return( LBER_DEFAULT );
213 if ( ber_read( ber, buf, datalen ) != datalen )
214 return( LBER_DEFAULT );
218 #ifdef STR_TRANSLATION
219 if ( datalen > 0 && ( ber->ber_options & LBER_TRANSLATE_STRINGS ) != 0
220 && ber->ber_decode_translate_proc != NULL ) {
223 if ( (*(ber->ber_decode_translate_proc))( &transbuf, &datalen,
225 return( LBER_DEFAULT );
227 if ( datalen > *len ) {
229 return( LBER_DEFAULT );
231 SAFEMEMCPY( buf, transbuf, datalen );
235 #endif /* STR_TRANSLATION */
242 ber_get_stringa( BerElement *ber, char **buf )
244 unsigned long datalen, tag;
246 if ( (tag = ber_skip_tag( ber, &datalen )) == LBER_DEFAULT )
247 return( LBER_DEFAULT );
249 if ( (*buf = (char *) malloc( (size_t)datalen + 1 )) == NULL )
250 return( LBER_DEFAULT );
252 if ( ber_read( ber, *buf, datalen ) != datalen )
253 return( LBER_DEFAULT );
254 (*buf)[datalen] = '\0';
256 #ifdef STR_TRANSLATION
257 if ( datalen > 0 && ( ber->ber_options & LBER_TRANSLATE_STRINGS ) != 0
258 && ber->ber_decode_translate_proc != NULL ) {
260 if ( (*(ber->ber_decode_translate_proc))( buf, &datalen, 1 )
263 return( LBER_DEFAULT );
266 #endif /* STR_TRANSLATION */
272 ber_get_stringal( BerElement *ber, struct berval **bv )
274 unsigned long len, tag;
276 if ( (*bv = (struct berval *) malloc( sizeof(struct berval) )) == NULL )
277 return( LBER_DEFAULT );
279 if ( (tag = ber_skip_tag( ber, &len )) == LBER_DEFAULT )
280 return( LBER_DEFAULT );
282 if ( ((*bv)->bv_val = (char *) malloc( (size_t)len + 1 )) == NULL )
283 return( LBER_DEFAULT );
285 if ( ber_read( ber, (*bv)->bv_val, len ) != len )
286 return( LBER_DEFAULT );
287 ((*bv)->bv_val)[len] = '\0';
290 #ifdef STR_TRANSLATION
291 if ( len > 0 && ( ber->ber_options & LBER_TRANSLATE_STRINGS ) != 0
292 && ber->ber_decode_translate_proc != NULL ) {
294 if ( (*(ber->ber_decode_translate_proc))( &((*bv)->bv_val),
296 free( (*bv)->bv_val );
297 return( LBER_DEFAULT );
299 (*bv)->bv_len = len - 1;
301 #endif /* STR_TRANSLATION */
307 ber_get_bitstringa( BerElement *ber, char **buf, unsigned long *blen )
309 unsigned long datalen, tag;
310 unsigned char unusedbits;
312 if ( (tag = ber_skip_tag( ber, &datalen )) == LBER_DEFAULT )
313 return( LBER_DEFAULT );
316 if ( (*buf = (char *) malloc( (size_t)datalen )) == NULL )
317 return( LBER_DEFAULT );
319 if ( ber_read( ber, (char *)&unusedbits, 1 ) != 1 )
320 return( LBER_DEFAULT );
322 if ( ber_read( ber, *buf, datalen ) != datalen )
323 return( LBER_DEFAULT );
325 *blen = datalen * 8 - unusedbits;
330 ber_get_null( BerElement *ber )
332 unsigned long len, tag;
334 if ( (tag = ber_skip_tag( ber, &len )) == LBER_DEFAULT )
335 return( LBER_DEFAULT );
338 return( LBER_DEFAULT );
344 ber_get_boolean( BerElement *ber, int *boolval )
349 rc = ber_get_int( ber, &longbool );
356 ber_first_element( BerElement *ber, unsigned long *len, char **last )
358 /* skip the sequence header, use the len to mark where to stop */
359 if ( ber_skip_tag( ber, len ) == LBER_DEFAULT ) {
360 return( LBER_DEFAULT );
363 *last = ber->ber_ptr + *len;
365 if ( *last == ber->ber_ptr ) {
366 return( LBER_DEFAULT );
369 return( ber_peek_tag( ber, len ) );
373 ber_next_element( BerElement *ber, unsigned long *len, char *last )
375 if ( ber->ber_ptr == last ) {
376 return( LBER_DEFAULT );
379 return( ber_peek_tag( ber, len ) );
386 ( BerElement *ber, char *fmt, ... )
398 char *s, **ss, ***sss;
399 struct berval ***bv, **bvp, *bval;
408 ber = va_arg( ap, BerElement * );
409 fmt = va_arg( ap, char * );
413 if ( lber_debug & 64 ) {
414 fprintf( stderr, "ber_scanf fmt (%s) ber:\n", fmt );
419 for ( rc = 0; *fmt && rc != LBER_DEFAULT; fmt++ ) {
421 case 'a': /* octet string - allocate storage as needed */
422 ss = va_arg( ap, char ** );
423 rc = ber_get_stringa( ber, ss );
426 case 'b': /* boolean */
427 i = va_arg( ap, int * );
428 rc = ber_get_boolean( ber, i );
431 case 'e': /* enumerated */
433 l = va_arg( ap, long * );
434 rc = ber_get_int( ber, l );
437 case 'l': /* length of next item */
438 l = va_arg( ap, long * );
439 rc = ber_peek_tag( ber, (unsigned long *)l );
443 rc = ber_get_null( ber );
446 case 's': /* octet string - in a buffer */
447 s = va_arg( ap, char * );
448 l = va_arg( ap, long * );
449 rc = ber_get_stringb( ber, s, (unsigned long *)l );
452 case 'o': /* octet string in a supplied berval */
453 bval = va_arg( ap, struct berval * );
454 ber_peek_tag( ber, &bval->bv_len );
455 rc = ber_get_stringa( ber, &bval->bv_val );
458 case 'O': /* octet string - allocate & include length */
459 bvp = va_arg( ap, struct berval ** );
460 rc = ber_get_stringal( ber, bvp );
463 case 'B': /* bit string - allocate storage as needed */
464 ss = va_arg( ap, char ** );
465 l = va_arg( ap, long * ); /* for length, in bits */
466 rc = ber_get_bitstringa( ber, ss, (unsigned long *)l );
469 case 't': /* tag of next item */
470 i = va_arg( ap, int * );
471 *i = rc = ber_peek_tag( ber, &len );
474 case 'T': /* skip tag of next item */
475 i = va_arg( ap, int * );
476 *i = rc = ber_skip_tag( ber, &len );
479 case 'v': /* sequence of strings */
480 sss = va_arg( ap, char *** );
483 for ( tag = ber_first_element( ber, &len, &last );
484 tag != LBER_DEFAULT && rc != LBER_DEFAULT;
485 tag = ber_next_element( ber, &len, last ) ) {
486 if ( *sss == NULL ) {
487 *sss = (char **) malloc(
488 2 * sizeof(char *) );
490 *sss = (char **) realloc( *sss,
491 (j + 2) * sizeof(char *) );
493 rc = ber_get_stringa( ber, &((*sss)[j]) );
500 case 'V': /* sequence of strings + lengths */
501 bv = va_arg( ap, struct berval *** );
504 for ( tag = ber_first_element( ber, &len, &last );
505 tag != LBER_DEFAULT && rc != LBER_DEFAULT;
506 tag = ber_next_element( ber, &len, last ) ) {
508 *bv = (struct berval **) malloc(
509 2 * sizeof(struct berval *) );
511 *bv = (struct berval **) realloc( *bv,
512 (j + 2) * sizeof(struct berval *) );
514 rc = ber_get_stringal( ber, &((*bv)[j]) );
521 case 'x': /* skip the next element - whatever it is */
522 if ( (rc = ber_skip_tag( ber, &len )) == LBER_DEFAULT )
527 case '{': /* begin sequence */
528 case '[': /* begin set */
529 if ( *(fmt + 1) != 'v' && *(fmt + 1) != 'V' )
530 rc = ber_skip_tag( ber, &len );
533 case '}': /* end sequence */
534 case ']': /* end set */
539 fprintf( stderr, "unknown fmt %c\n", *fmt );
540 #endif /* LDAP_LIBUI */
552 ber_bvfree( struct berval *bv )
554 if ( bv->bv_val != NULL )
560 ber_bvecfree( struct berval **bv )
564 for ( i = 0; bv[i] != NULL; i++ )
570 ber_bvdup( struct berval *bv )
574 if ( (new = (struct berval *) malloc( sizeof(struct berval) ))
578 if ( (new->bv_val = (char *) malloc( bv->bv_len + 1 )) == NULL ) {
581 SAFEMEMCPY( new->bv_val, bv->bv_val, (size_t) bv->bv_len );
582 new->bv_val[bv->bv_len] = '\0';
583 new->bv_len = bv->bv_len;
589 #ifdef STR_TRANSLATION
591 ber_set_string_translators( BerElement *ber, BERTranslateProc encode_proc,
592 BERTranslateProc decode_proc )
594 ber->ber_encode_translate_proc = encode_proc;
595 ber->ber_decode_translate_proc = decode_proc;
597 #endif /* STR_TRANSLATION */