/* decode.c - ber input decoding routines */ /* * Copyright (c) 1990 Regents of the University of Michigan. * All rights reserved. * * Redistribution and use in source and binary forms are permitted * provided that this notice is preserved and that due credit is given * to the University of Michigan at Ann Arbor. The name of the University * may not be used to endorse or promote products derived from this * software without specific prior written permission. This software * is provided ``as is'' without express or implied warranty. */ #include #ifdef MACOS #include #include #include "macos.h" #else /* MACOS */ #if defined(NeXT) || defined(VMS) #include #else /* next || vms */ #include #endif /* next || vms */ #if defined(BC31) || defined(_WIN32) #include #else /* BC31 || _WIN32 */ #include #endif /* BC31 || _WIN32 */ #include #include #include #ifdef PCNFS #include #endif /* PCNFS */ #endif /* MACOS */ #if defined( DOS ) || defined( _WIN32 ) #include "msdos.h" #endif /* DOS */ #include #include "lber.h" #ifdef LDAP_DEBUG int lber_debug; #endif #ifdef NEEDPROTOS static int ber_getnint( BerElement *ber, long *num, int len ); #endif /* NEEDPROTOS */ /* return the tag - LBER_DEFAULT returned means trouble */ unsigned long ber_get_tag( BerElement *ber ) { unsigned char xbyte; unsigned long tag; char *tagp; int i; if ( ber_read( ber, (char *) &xbyte, 1 ) != 1 ) return( LBER_DEFAULT ); if ( (xbyte & LBER_BIG_TAG_MASK) != LBER_BIG_TAG_MASK ) return( (unsigned long) xbyte ); tagp = (char *) &tag; tagp[0] = xbyte; for ( i = 1; i < sizeof(long); i++ ) { if ( ber_read( ber, (char *) &xbyte, 1 ) != 1 ) return( LBER_DEFAULT ); tagp[i] = xbyte; if ( ! (xbyte & LBER_MORE_TAG_MASK) ) break; } /* tag too big! */ if ( i == sizeof(long) ) return( LBER_DEFAULT ); /* want leading, not trailing 0's */ return( tag >> (sizeof(long) - i - 1) ); } unsigned long ber_skip_tag( BerElement *ber, unsigned long *len ) { unsigned long tag; unsigned char lc; int noctets, diff; unsigned long netlen; /* * Any ber element looks like this: tag length contents. * Assuming everything's ok, we return the tag byte (we * can assume a single byte), and return the length in len. * * Assumptions: * 1) definite lengths * 2) primitive encodings used whenever possible */ /* * First, we read the tag. */ if ( (tag = ber_get_tag( ber )) == LBER_DEFAULT ) return( LBER_DEFAULT ); /* * Next, read the length. The first byte contains the length of * the length. If bit 8 is set, the length is the long form, * otherwise it's the short form. We don't allow a length that's * greater than what we can hold in an unsigned long. */ *len = netlen = 0; if ( ber_read( ber, (char *) &lc, 1 ) != 1 ) return( LBER_DEFAULT ); if ( lc & 0x80 ) { noctets = (lc & 0x7f); if ( noctets > sizeof(unsigned long) ) return( LBER_DEFAULT ); diff = sizeof(unsigned long) - noctets; if ( ber_read( ber, (char *) &netlen + diff, noctets ) != noctets ) return( LBER_DEFAULT ); *len = LBER_NTOHL( netlen ); } else { *len = lc; } return( tag ); } unsigned long ber_peek_tag( BerElement *ber, unsigned long *len ) { char *save; unsigned long tag; save = ber->ber_ptr; tag = ber_skip_tag( ber, len ); ber->ber_ptr = save; return( tag ); } static int ber_getnint( BerElement *ber, long *num, int len ) { int diff, sign, i; long netnum; /* * The tag and length have already been stripped off. We should * be sitting right before len bytes of 2's complement integer, * ready to be read straight into an int. We may have to sign * extend after we read it in. */ if ( len > sizeof(long) ) return( -1 ); netnum = 0; diff = sizeof(long) - len; /* read into the low-order bytes of netnum */ if ( ber_read( ber, ((char *) &netnum) + diff, len ) != len ) return( -1 ); /* sign extend if necessary */ sign = ((0x80 << ((len - 1) * 8)) & netnum); if ( sign && len < sizeof(long) ) { for ( i = sizeof(long) - 1; i > len - 1; i-- ) { netnum |= (0xffL << (i * 8)); } } *num = LBER_NTOHL( netnum ); return( len ); } unsigned long ber_get_int( BerElement *ber, long *num ) { unsigned long tag, len; if ( (tag = ber_skip_tag( ber, &len )) == LBER_DEFAULT ) return( LBER_DEFAULT ); if ( ber_getnint( ber, num, (int)len ) != len ) return( LBER_DEFAULT ); else return( tag ); } unsigned long ber_get_stringb( BerElement *ber, char *buf, unsigned long *len ) { unsigned long datalen, tag; #ifdef STR_TRANSLATION char *transbuf; #endif /* STR_TRANSLATION */ if ( (tag = ber_skip_tag( ber, &datalen )) == LBER_DEFAULT ) return( LBER_DEFAULT ); if ( datalen > (*len - 1) ) return( LBER_DEFAULT ); if ( ber_read( ber, buf, datalen ) != datalen ) return( LBER_DEFAULT ); buf[datalen] = '\0'; #ifdef STR_TRANSLATION if ( datalen > 0 && ( ber->ber_options & LBER_TRANSLATE_STRINGS ) != 0 && ber->ber_decode_translate_proc != NULL ) { transbuf = buf; ++datalen; if ( (*(ber->ber_decode_translate_proc))( &transbuf, &datalen, 0 ) != 0 ) { return( LBER_DEFAULT ); } if ( datalen > *len ) { free( transbuf ); return( LBER_DEFAULT ); } SAFEMEMCPY( buf, transbuf, datalen ); free( transbuf ); --datalen; } #endif /* STR_TRANSLATION */ *len = datalen; return( tag ); } unsigned long ber_get_stringa( BerElement *ber, char **buf ) { unsigned long datalen, tag; if ( (tag = ber_skip_tag( ber, &datalen )) == LBER_DEFAULT ) return( LBER_DEFAULT ); if ( (*buf = (char *) malloc( (size_t)datalen + 1 )) == NULL ) return( LBER_DEFAULT ); if ( ber_read( ber, *buf, datalen ) != datalen ) return( LBER_DEFAULT ); (*buf)[datalen] = '\0'; #ifdef STR_TRANSLATION if ( datalen > 0 && ( ber->ber_options & LBER_TRANSLATE_STRINGS ) != 0 && ber->ber_decode_translate_proc != NULL ) { ++datalen; if ( (*(ber->ber_decode_translate_proc))( buf, &datalen, 1 ) != 0 ) { free( *buf ); return( LBER_DEFAULT ); } } #endif /* STR_TRANSLATION */ return( tag ); } unsigned long ber_get_stringal( BerElement *ber, struct berval **bv ) { unsigned long len, tag; if ( (*bv = (struct berval *) malloc( sizeof(struct berval) )) == NULL ) return( LBER_DEFAULT ); if ( (tag = ber_skip_tag( ber, &len )) == LBER_DEFAULT ) return( LBER_DEFAULT ); if ( ((*bv)->bv_val = (char *) malloc( (size_t)len + 1 )) == NULL ) return( LBER_DEFAULT ); if ( ber_read( ber, (*bv)->bv_val, len ) != len ) return( LBER_DEFAULT ); ((*bv)->bv_val)[len] = '\0'; (*bv)->bv_len = len; #ifdef STR_TRANSLATION if ( len > 0 && ( ber->ber_options & LBER_TRANSLATE_STRINGS ) != 0 && ber->ber_decode_translate_proc != NULL ) { ++len; if ( (*(ber->ber_decode_translate_proc))( &((*bv)->bv_val), &len, 1 ) != 0 ) { free( (*bv)->bv_val ); return( LBER_DEFAULT ); } (*bv)->bv_len = len - 1; } #endif /* STR_TRANSLATION */ return( tag ); } unsigned long ber_get_bitstringa( BerElement *ber, char **buf, unsigned long *blen ) { unsigned long datalen, tag; unsigned char unusedbits; if ( (tag = ber_skip_tag( ber, &datalen )) == LBER_DEFAULT ) return( LBER_DEFAULT ); --datalen; if ( (*buf = (char *) malloc( (size_t)datalen )) == NULL ) return( LBER_DEFAULT ); if ( ber_read( ber, (char *)&unusedbits, 1 ) != 1 ) return( LBER_DEFAULT ); if ( ber_read( ber, *buf, datalen ) != datalen ) return( LBER_DEFAULT ); *blen = datalen * 8 - unusedbits; return( tag ); } unsigned long ber_get_null( BerElement *ber ) { unsigned long len, tag; if ( (tag = ber_skip_tag( ber, &len )) == LBER_DEFAULT ) return( LBER_DEFAULT ); if ( len != 0 ) return( LBER_DEFAULT ); return( tag ); } unsigned long ber_get_boolean( BerElement *ber, int *boolval ) { long longbool; int rc; rc = ber_get_int( ber, &longbool ); *boolval = longbool; return( rc ); } unsigned long ber_first_element( BerElement *ber, unsigned long *len, char **last ) { /* skip the sequence header, use the len to mark where to stop */ if ( ber_skip_tag( ber, len ) == LBER_DEFAULT ) { return( LBER_DEFAULT ); } *last = ber->ber_ptr + *len; if ( *last == ber->ber_ptr ) { return( LBER_DEFAULT ); } return( ber_peek_tag( ber, len ) ); } unsigned long ber_next_element( BerElement *ber, unsigned long *len, char *last ) { if ( ber->ber_ptr == last ) { return( LBER_DEFAULT ); } return( ber_peek_tag( ber, len ) ); } /* VARARGS */ unsigned long ber_scanf( #if defined( MACOS ) || defined( BC31 ) || defined( _WIN32 ) BerElement *ber, char *fmt, ... ) #else va_alist ) va_dcl #endif { va_list ap; #if !defined( MACOS ) && !defined( BC31 ) && !defined( _WIN32 ) BerElement *ber; char *fmt; #endif char *last; char *s, **ss, ***sss; struct berval ***bv, **bvp, *bval; int *i, j; long *l, rc, tag; unsigned long len; #if defined( MACOS ) || defined( BC31 ) || defined( _WIN32 ) va_start( ap, fmt ); #else va_start( ap ); ber = va_arg( ap, BerElement * ); fmt = va_arg( ap, char * ); #endif #ifdef LDAP_DEBUG if ( lber_debug & 64 ) { fprintf( stderr, "ber_scanf fmt (%s) ber:\n", fmt ); ber_dump( ber, 1 ); } #endif for ( rc = 0; *fmt && rc != LBER_DEFAULT; fmt++ ) { switch ( *fmt ) { case 'a': /* octet string - allocate storage as needed */ ss = va_arg( ap, char ** ); rc = ber_get_stringa( ber, ss ); break; case 'b': /* boolean */ i = va_arg( ap, int * ); rc = ber_get_boolean( ber, i ); break; case 'e': /* enumerated */ case 'i': /* int */ l = va_arg( ap, long * ); rc = ber_get_int( ber, l ); break; case 'l': /* length of next item */ l = va_arg( ap, long * ); rc = ber_peek_tag( ber, (unsigned long *)l ); break; case 'n': /* null */ rc = ber_get_null( ber ); break; case 's': /* octet string - in a buffer */ s = va_arg( ap, char * ); l = va_arg( ap, long * ); rc = ber_get_stringb( ber, s, (unsigned long *)l ); break; case 'o': /* octet string in a supplied berval */ bval = va_arg( ap, struct berval * ); ber_peek_tag( ber, &bval->bv_len ); rc = ber_get_stringa( ber, &bval->bv_val ); break; case 'O': /* octet string - allocate & include length */ bvp = va_arg( ap, struct berval ** ); rc = ber_get_stringal( ber, bvp ); break; case 'B': /* bit string - allocate storage as needed */ ss = va_arg( ap, char ** ); l = va_arg( ap, long * ); /* for length, in bits */ rc = ber_get_bitstringa( ber, ss, (unsigned long *)l ); break; case 't': /* tag of next item */ i = va_arg( ap, int * ); *i = rc = ber_peek_tag( ber, &len ); break; case 'T': /* skip tag of next item */ i = va_arg( ap, int * ); *i = rc = ber_skip_tag( ber, &len ); break; case 'v': /* sequence of strings */ sss = va_arg( ap, char *** ); *sss = NULL; j = 0; for ( tag = ber_first_element( ber, &len, &last ); tag != LBER_DEFAULT && rc != LBER_DEFAULT; tag = ber_next_element( ber, &len, last ) ) { if ( *sss == NULL ) { *sss = (char **) malloc( 2 * sizeof(char *) ); } else { *sss = (char **) realloc( *sss, (j + 2) * sizeof(char *) ); } rc = ber_get_stringa( ber, &((*sss)[j]) ); j++; } if ( j > 0 ) (*sss)[j] = NULL; break; case 'V': /* sequence of strings + lengths */ bv = va_arg( ap, struct berval *** ); *bv = NULL; j = 0; for ( tag = ber_first_element( ber, &len, &last ); tag != LBER_DEFAULT && rc != LBER_DEFAULT; tag = ber_next_element( ber, &len, last ) ) { if ( *bv == NULL ) { *bv = (struct berval **) malloc( 2 * sizeof(struct berval *) ); } else { *bv = (struct berval **) realloc( *bv, (j + 2) * sizeof(struct berval *) ); } rc = ber_get_stringal( ber, &((*bv)[j]) ); j++; } if ( j > 0 ) (*bv)[j] = NULL; break; case 'x': /* skip the next element - whatever it is */ if ( (rc = ber_skip_tag( ber, &len )) == LBER_DEFAULT ) break; ber->ber_ptr += len; break; case '{': /* begin sequence */ case '[': /* begin set */ if ( *(fmt + 1) != 'v' && *(fmt + 1) != 'V' ) rc = ber_skip_tag( ber, &len ); break; case '}': /* end sequence */ case ']': /* end set */ break; default: #ifndef NO_USERINTERFACE fprintf( stderr, "unknown fmt %c\n", *fmt ); #endif /* NO_USERINTERFACE */ rc = LBER_DEFAULT; break; } } va_end( ap ); return( rc ); } void ber_bvfree( struct berval *bv ) { if ( bv->bv_val != NULL ) free( bv->bv_val ); free( (char *) bv ); } void ber_bvecfree( struct berval **bv ) { int i; for ( i = 0; bv[i] != NULL; i++ ) ber_bvfree( bv[i] ); free( (char *) bv ); } struct berval * ber_bvdup( struct berval *bv ) { struct berval *new; if ( (new = (struct berval *) malloc( sizeof(struct berval) )) == NULL ) { return( NULL ); } if ( (new->bv_val = (char *) malloc( bv->bv_len + 1 )) == NULL ) { return( NULL ); } SAFEMEMCPY( new->bv_val, bv->bv_val, (size_t) bv->bv_len ); new->bv_val[bv->bv_len] = '\0'; new->bv_len = bv->bv_len; return( new ); } #ifdef STR_TRANSLATION void ber_set_string_translators( BerElement *ber, BERTranslateProc encode_proc, BERTranslateProc decode_proc ) { ber->ber_encode_translate_proc = encode_proc; ber->ber_decode_translate_proc = decode_proc; } #endif /* STR_TRANSLATION */