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822 lines
16 KiB
C
822 lines
16 KiB
C
/* Encode.c - ber output encoding routines */
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/* $OpenLDAP$ */
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/*
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* Copyright 1998-2000 The OpenLDAP Foundation, All Rights Reserved.
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* COPYING RESTRICTIONS APPLY, see COPYRIGHT file
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*/
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/* Portions
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* Copyright (c) 1990 Regents of the University of Michigan.
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms are permitted
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* provided that this notice is preserved and that due credit is given
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* to the University of Michigan at Ann Arbor. The name of the University
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* may not be used to endorse or promote products derived from this
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* software without specific prior written permission. This software
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* is provided ``as is'' without express or implied warranty.
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*/
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#include "portable.h"
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#include <stdio.h>
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#include <ac/stdlib.h>
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#include <ac/stdarg.h>
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#include <ac/socket.h>
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#include <ac/string.h>
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#include "lber-int.h"
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static int ber_put_len LDAP_P((
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BerElement *ber,
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ber_len_t len,
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int nosos ));
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static int ber_start_seqorset LDAP_P((
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BerElement *ber,
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ber_tag_t tag ));
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static int ber_put_seqorset LDAP_P(( BerElement *ber ));
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static int ber_put_int_or_enum LDAP_P((
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BerElement *ber,
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ber_int_t num,
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ber_tag_t tag ));
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static ber_len_t
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ber_calc_taglen( ber_tag_t tag )
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{
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int i;
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ber_tag_t mask;
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/* find the first non-all-zero byte in the tag */
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for ( i = sizeof(ber_tag_t) - 1; i > 0; i-- ) {
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mask = ((ber_tag_t)0xffU << (i * 8));
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/* not all zero */
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if ( tag & mask ) break;
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}
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return i + 1;
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}
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static int
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ber_put_tag(
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BerElement *ber,
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ber_tag_t tag,
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int nosos )
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{
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int rc;
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ber_len_t taglen;
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ber_len_t i;
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unsigned char nettag[sizeof(ber_tag_t)];
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assert( ber != NULL );
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assert( BER_VALID( ber ) );
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taglen = ber_calc_taglen( tag );
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for( i=0; i<taglen; i++ ) {
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nettag[(sizeof(ber_tag_t)-1) - i] = (unsigned char)(tag & 0xffU);
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tag >>= 8;
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}
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rc = ber_write( ber,
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&nettag[sizeof(ber_tag_t) - taglen],
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taglen, nosos );
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return rc;
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}
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static ber_len_t
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ber_calc_lenlen( ber_len_t len )
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{
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/*
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* short len if it's less than 128 - one byte giving the len,
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* with bit 8 0.
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*/
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if ( len <= (ber_len_t) 0x7FU )
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return 1;
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/*
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* long len otherwise - one byte with bit 8 set, giving the
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* length of the length, followed by the length itself.
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*/
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if ( len <= (ber_len_t) 0xffU )
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return 2;
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if ( len <= (ber_len_t) 0xffffU )
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return 3;
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if ( len <= (ber_len_t) 0xffffffU )
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return 4;
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return 5;
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}
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static int
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ber_put_len( BerElement *ber, ber_len_t len, int nosos )
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{
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int rc;
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int i,j;
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char lenlen;
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ber_len_t mask;
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unsigned char netlen[sizeof(ber_len_t)];
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assert( ber != NULL );
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assert( BER_VALID( ber ) );
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/*
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* short len if it's less than 128 - one byte giving the len,
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* with bit 8 0.
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*/
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if ( len <= 127 ) {
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char length_byte = (char) len;
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return ber_write( ber, &length_byte, 1, nosos );
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}
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/*
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* long len otherwise - one byte with bit 8 set, giving the
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* length of the length, followed by the length itself.
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*/
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/* find the first non-all-zero byte */
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for ( i = sizeof(ber_len_t) - 1; i > 0; i-- ) {
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mask = ((ber_len_t)0xffU << (i * 8));
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/* not all zero */
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if ( len & mask ) break;
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}
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lenlen = (unsigned char) ++i;
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if ( lenlen > 4 )
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return -1;
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lenlen |= 0x80UL;
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/* write the length of the length */
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if ( ber_write( ber, &lenlen, 1, nosos ) != 1 )
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return -1;
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for( j=0; j<i; j++) {
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netlen[(sizeof(ber_len_t)-1) - j] = (unsigned char)(len & 0xffU);
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len >>= 8;
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}
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/* write the length itself */
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rc = ber_write( ber,
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&netlen[sizeof(ber_len_t)-i],
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i, nosos );
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return rc == i ? i+1 : -1;
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}
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static int
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ber_put_int_or_enum(
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BerElement *ber,
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ber_int_t num,
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ber_tag_t tag )
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{
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int rc;
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int i, j, sign;
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ber_len_t len, lenlen, taglen;
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ber_uint_t unum, mask;
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unsigned char netnum[sizeof(ber_uint_t)];
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assert( ber != NULL );
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assert( BER_VALID( ber ) );
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sign = (num < 0);
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unum = num; /* Bit fiddling should be done with unsigned values */
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/*
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* high bit is set - look for first non-all-one byte
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* high bit is clear - look for first non-all-zero byte
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*/
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for ( i = sizeof(ber_int_t) - 1; i > 0; i-- ) {
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mask = ((ber_uint_t)0xffU << (i * 8));
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if ( sign ) {
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/* not all ones */
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if ( (unum & mask) != mask ) break;
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} else {
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/* not all zero */
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if ( unum & mask ) break;
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}
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}
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/*
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* we now have the "leading byte". if the high bit on this
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* byte matches the sign bit, we need to "back up" a byte.
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*/
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mask = (unum & ((ber_uint_t)0x80U << (i * 8)));
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if ( (mask && !sign) || (sign && !mask) ) {
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i++;
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}
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len = i + 1;
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if ( (taglen = ber_put_tag( ber, tag, 0 )) == -1 ) {
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return -1;
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}
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if ( (lenlen = ber_put_len( ber, len, 0 )) == -1 )
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return -1;
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i++;
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for( j=0; j<i; j++ ) {
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netnum[(sizeof(ber_int_t)-1) - j] = (unsigned char)(unum & 0xffU);
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unum >>= 8;
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}
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rc = ber_write( ber,
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&netnum[sizeof(ber_int_t) - i],
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i, 0 );
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/* length of tag + length + contents */
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return rc == i ? taglen + lenlen + i : -1;
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}
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int
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ber_put_enum(
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BerElement *ber,
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ber_int_t num,
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ber_tag_t tag )
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{
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assert( ber != NULL );
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assert( BER_VALID( ber ) );
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if ( tag == LBER_DEFAULT ) {
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tag = LBER_ENUMERATED;
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}
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return ber_put_int_or_enum( ber, num, tag );
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}
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int
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ber_put_int(
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BerElement *ber,
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ber_int_t num,
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ber_tag_t tag )
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{
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assert( ber != NULL );
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assert( BER_VALID( ber ) );
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if ( tag == LBER_DEFAULT ) {
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tag = LBER_INTEGER;
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}
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return ber_put_int_or_enum( ber, num, tag );
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}
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int
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ber_put_ostring(
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BerElement *ber,
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LDAP_CONST char *str,
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ber_len_t len,
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ber_tag_t tag )
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{
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ber_len_t taglen, lenlen;
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int rc;
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assert( ber != NULL );
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assert( str != NULL );
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assert( BER_VALID( ber ) );
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if ( tag == LBER_DEFAULT ) {
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tag = LBER_OCTETSTRING;
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}
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if ( (taglen = ber_put_tag( ber, tag, 0 )) == -1 )
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return -1;
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if ( (lenlen = ber_put_len( ber, len, 0 )) == -1 ||
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(ber_len_t) ber_write( ber, str, len, 0 ) != len ) {
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rc = -1;
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} else {
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/* return length of tag + length + contents */
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rc = taglen + lenlen + len;
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}
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return rc;
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}
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int
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ber_put_berval(
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BerElement *ber,
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LDAP_CONST struct berval *bv,
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ber_tag_t tag )
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{
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assert( ber != NULL );
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assert( BER_VALID( ber ) );
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if( bv == NULL || bv->bv_len == 0 ) {
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return ber_put_ostring( ber, "", (ber_len_t) 0, tag );
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}
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return ber_put_ostring( ber, bv->bv_val, bv->bv_len, tag );
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}
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int
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ber_put_string(
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BerElement *ber,
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LDAP_CONST char *str,
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ber_tag_t tag )
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{
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assert( ber != NULL );
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assert( str != NULL );
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assert( BER_VALID( ber ) );
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return ber_put_ostring( ber, str, strlen( str ), tag );
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}
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int
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ber_put_bitstring(
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BerElement *ber,
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LDAP_CONST char *str,
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ber_len_t blen /* in bits */,
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ber_tag_t tag )
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{
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ber_len_t taglen, lenlen, len;
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unsigned char unusedbits;
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assert( ber != NULL );
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assert( str != NULL );
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assert( BER_VALID( ber ) );
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if ( tag == LBER_DEFAULT ) {
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tag = LBER_BITSTRING;
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}
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if ( (taglen = ber_put_tag( ber, tag, 0 )) == -1 ) {
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return -1;
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}
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len = ( blen + 7 ) / 8;
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unusedbits = (unsigned char) ((len * 8) - blen);
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if ( (lenlen = ber_put_len( ber, len + 1, 0 )) == -1 ) {
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return -1;
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}
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if ( ber_write( ber, (char *)&unusedbits, 1, 0 ) != 1 ) {
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return -1;
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}
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if ( (ber_len_t) ber_write( ber, str, len, 0 ) != len ) {
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return -1;
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}
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/* return length of tag + length + unused bit count + contents */
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return taglen + 1 + lenlen + len;
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}
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int
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ber_put_null( BerElement *ber, ber_tag_t tag )
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{
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ber_len_t taglen;
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assert( ber != NULL );
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assert( BER_VALID( ber ) );
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if ( tag == LBER_DEFAULT ) {
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tag = LBER_NULL;
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}
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if ( (taglen = ber_put_tag( ber, tag, 0 )) == -1 ) {
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return -1;
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}
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if ( ber_put_len( ber, 0, 0 ) != 1 ) {
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return -1;
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}
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return taglen + 1;
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}
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int
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ber_put_boolean(
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BerElement *ber,
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ber_int_t boolval,
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ber_tag_t tag )
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{
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ber_len_t taglen;
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unsigned char trueval = (unsigned char) -1;
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unsigned char falseval = 0;
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assert( ber != NULL );
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assert( BER_VALID( ber ) );
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if ( tag == LBER_DEFAULT )
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tag = LBER_BOOLEAN;
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if ( (taglen = ber_put_tag( ber, tag, 0 )) == -1 ) {
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return -1;
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}
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if ( ber_put_len( ber, 1, 0 ) != 1 ) {
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return -1;
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}
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if ( ber_write( ber, (char *)(boolval ? &trueval : &falseval), 1, 0 )
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!= 1 )
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{
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return -1;
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}
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return taglen + 2;
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}
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#define FOUR_BYTE_LEN 5
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static int
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ber_start_seqorset(
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BerElement *ber,
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ber_tag_t tag )
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{
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Seqorset *new;
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assert( ber != NULL );
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assert( BER_VALID( ber ) );
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new = (Seqorset *) LBER_CALLOC( 1, sizeof(Seqorset) );
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if ( new == NULL ) {
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return -1;
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}
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new->sos_ber = ber;
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if ( ber->ber_sos == NULL ) {
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new->sos_first = ber->ber_ptr;
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} else {
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new->sos_first = ber->ber_sos->sos_ptr;
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}
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/* Set aside room for a 4 byte length field */
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new->sos_ptr = new->sos_first + ber_calc_taglen( tag ) + FOUR_BYTE_LEN;
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new->sos_tag = tag;
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new->sos_next = ber->ber_sos;
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ber->ber_sos = new;
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return 0;
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}
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int
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ber_start_seq( BerElement *ber, ber_tag_t tag )
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{
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assert( ber != NULL );
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assert( BER_VALID( ber ) );
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if ( tag == LBER_DEFAULT ) {
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tag = LBER_SEQUENCE;
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}
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return ber_start_seqorset( ber, tag );
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}
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int
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ber_start_set( BerElement *ber, ber_tag_t tag )
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{
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assert( ber != NULL );
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assert( BER_VALID( ber ) );
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if ( tag == LBER_DEFAULT ) {
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tag = LBER_SET;
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}
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return ber_start_seqorset( ber, tag );
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}
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static int
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ber_put_seqorset( BerElement *ber )
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{
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int rc;
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ber_len_t len;
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unsigned char netlen[sizeof(ber_len_t)];
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ber_len_t taglen, lenlen;
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unsigned char ltag = 0x80U + FOUR_BYTE_LEN - 1;
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Seqorset *next;
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Seqorset **sos = &ber->ber_sos;
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assert( ber != NULL );
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assert( BER_VALID( ber ) );
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/*
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* If this is the toplevel sequence or set, we need to actually
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* write the stuff out. Otherwise, it's already been put in
|
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* the appropriate buffer and will be written when the toplevel
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* one is written. In this case all we need to do is update the
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* length and tag.
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*/
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len = (*sos)->sos_clen;
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if ( sizeof(ber_len_t) > 4 && len > 0xffffffffUL ) {
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return -1;
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}
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if ( ber->ber_options & LBER_USE_DER ) {
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lenlen = ber_calc_lenlen( len );
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} else {
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lenlen = FOUR_BYTE_LEN;
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}
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if( lenlen > 1 ) {
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ber_len_t i;
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for( i=0; i < lenlen-1; i++ ) {
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netlen[(sizeof(ber_len_t)-1) - i] =
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(unsigned char)((len >> i*8) & 0xffU);
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}
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} else {
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netlen[sizeof(ber_len_t)-1] = (unsigned char)(len & 0x7fU);
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}
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if ( (next = (*sos)->sos_next) == NULL ) {
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/* write the tag */
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if ( (taglen = ber_put_tag( ber, (*sos)->sos_tag, 1 )) == -1 )
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return( -1 );
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if ( ber->ber_options & LBER_USE_DER ) {
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/* Write the length in the minimum # of octets */
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if ( ber_put_len( ber, len, 1 ) == -1 ) {
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return -1;
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}
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|
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if (lenlen != FOUR_BYTE_LEN) {
|
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/*
|
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* We set aside FOUR_BYTE_LEN bytes for
|
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* the length field. Move the data if
|
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* we don't actually need that much
|
|
*/
|
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AC_MEMCPY( (*sos)->sos_first + taglen +
|
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lenlen, (*sos)->sos_first + taglen +
|
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FOUR_BYTE_LEN, len );
|
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}
|
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} else {
|
|
/* Fill FOUR_BYTE_LEN bytes for length field */
|
|
/* one byte of length length */
|
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if ( ber_write( ber, (char *)<ag, 1, 1 ) != 1 ) {
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return -1;
|
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}
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|
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/* the length itself */
|
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rc = ber_write( ber,
|
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&netlen[sizeof(ber_len_t) - (FOUR_BYTE_LEN-1)],
|
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FOUR_BYTE_LEN-1, 1 );
|
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|
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if( rc != FOUR_BYTE_LEN - 1 ) {
|
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return -1;
|
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}
|
|
}
|
|
/* The ber_ptr is at the set/seq start - move it to the end */
|
|
(*sos)->sos_ber->ber_ptr += len;
|
|
|
|
} else {
|
|
ber_len_t i;
|
|
unsigned char nettag[sizeof(ber_tag_t)];
|
|
ber_tag_t tmptag = (*sos)->sos_tag;
|
|
|
|
if( ber->ber_sos->sos_ptr > ber->ber_end ) {
|
|
/* The sos_ptr exceeds the end of the BerElement
|
|
* this can happen, for example, when the sos_ptr
|
|
* is near the end and no data was written for the
|
|
* 'V'. We must realloc the BerElement to ensure
|
|
* we don't overwrite the buffer when writing
|
|
* the tag and length fields.
|
|
*/
|
|
ber_len_t ext = ber->ber_sos->sos_ptr - ber->ber_end;
|
|
|
|
if( ber_realloc( ber, ext ) != 0 ) {
|
|
return -1;
|
|
}
|
|
}
|
|
|
|
/* the tag */
|
|
taglen = ber_calc_taglen( tmptag );
|
|
|
|
for( i = 0; i < taglen; i++ ) {
|
|
nettag[(sizeof(ber_tag_t)-1) - i] = (unsigned char)(tmptag & 0xffU);
|
|
tmptag >>= 8;
|
|
}
|
|
|
|
AC_FMEMCPY( (*sos)->sos_first,
|
|
&nettag[sizeof(ber_tag_t) - taglen],
|
|
taglen );
|
|
|
|
if ( ber->ber_options & LBER_USE_DER ) {
|
|
ltag = (lenlen == 1)
|
|
? (unsigned char) len
|
|
: (unsigned char) (0x80U + (lenlen - 1));
|
|
}
|
|
|
|
/* one byte of length length */
|
|
(*sos)->sos_first[1] = ltag;
|
|
|
|
if ( ber->ber_options & LBER_USE_DER ) {
|
|
if (lenlen > 1) {
|
|
/* Write the length itself */
|
|
AC_FMEMCPY( (*sos)->sos_first + 2,
|
|
&netlen[sizeof(ber_len_t) - (lenlen - 1)],
|
|
lenlen - 1 );
|
|
}
|
|
if (lenlen != FOUR_BYTE_LEN) {
|
|
/*
|
|
* We set aside FOUR_BYTE_LEN bytes for
|
|
* the length field. Move the data if
|
|
* we don't actually need that much
|
|
*/
|
|
AC_FMEMCPY( (*sos)->sos_first + taglen +
|
|
lenlen, (*sos)->sos_first + taglen +
|
|
FOUR_BYTE_LEN, len );
|
|
}
|
|
} else {
|
|
/* the length itself */
|
|
AC_FMEMCPY( (*sos)->sos_first + taglen + 1,
|
|
&netlen[sizeof(ber_len_t) - (FOUR_BYTE_LEN - 1)],
|
|
FOUR_BYTE_LEN - 1 );
|
|
}
|
|
|
|
next->sos_clen += (taglen + lenlen + len);
|
|
next->sos_ptr += (taglen + lenlen + len);
|
|
}
|
|
|
|
/* we're done with this seqorset, so free it up */
|
|
LBER_FREE( (char *) (*sos) );
|
|
*sos = next;
|
|
|
|
return taglen + lenlen + len;
|
|
}
|
|
|
|
int
|
|
ber_put_seq( BerElement *ber )
|
|
{
|
|
assert( ber != NULL );
|
|
assert( BER_VALID( ber ) );
|
|
|
|
return ber_put_seqorset( ber );
|
|
}
|
|
|
|
int
|
|
ber_put_set( BerElement *ber )
|
|
{
|
|
assert( ber != NULL );
|
|
assert( BER_VALID( ber ) );
|
|
|
|
return ber_put_seqorset( ber );
|
|
}
|
|
|
|
/* N tag */
|
|
static ber_tag_t lber_int_null = 0;
|
|
|
|
/* VARARGS */
|
|
int
|
|
ber_printf( BerElement *ber, LDAP_CONST char *fmt, ... )
|
|
{
|
|
va_list ap;
|
|
char *s, **ss;
|
|
struct berval *bv, **bvp;
|
|
int rc;
|
|
ber_int_t i;
|
|
ber_len_t len;
|
|
|
|
assert( ber != NULL );
|
|
assert( fmt != NULL );
|
|
|
|
assert( BER_VALID( ber ) );
|
|
|
|
va_start( ap, fmt );
|
|
|
|
for ( rc = 0; *fmt && rc != -1; fmt++ ) {
|
|
switch ( *fmt ) {
|
|
case '!': { /* hook */
|
|
BEREncodeCallback *f;
|
|
void *p;
|
|
|
|
f = va_arg( ap, BEREncodeCallback * );
|
|
p = va_arg( ap, void * );
|
|
|
|
rc = (*f)( ber, p );
|
|
} break;
|
|
|
|
case 'b': /* boolean */
|
|
i = va_arg( ap, ber_int_t );
|
|
rc = ber_put_boolean( ber, i, ber->ber_tag );
|
|
break;
|
|
|
|
case 'i': /* int */
|
|
i = va_arg( ap, ber_int_t );
|
|
rc = ber_put_int( ber, i, ber->ber_tag );
|
|
break;
|
|
|
|
case 'e': /* enumeration */
|
|
i = va_arg( ap, ber_int_t );
|
|
rc = ber_put_enum( ber, i, ber->ber_tag );
|
|
break;
|
|
|
|
case 'n': /* null */
|
|
rc = ber_put_null( ber, ber->ber_tag );
|
|
break;
|
|
|
|
case 'N': /* Debug NULL */
|
|
if( lber_int_null != 0 ) {
|
|
/* Insert NULL to ensure peer ignores unknown tags */
|
|
rc = ber_put_null( ber, lber_int_null );
|
|
} else {
|
|
rc = 0;
|
|
}
|
|
break;
|
|
|
|
case 'o': /* octet string (non-null terminated) */
|
|
s = va_arg( ap, char * );
|
|
len = va_arg( ap, ber_len_t );
|
|
rc = ber_put_ostring( ber, s, len, ber->ber_tag );
|
|
break;
|
|
|
|
case 'O': /* berval octet string */
|
|
bv = va_arg( ap, struct berval * );
|
|
if( bv == NULL ) break;
|
|
rc = ber_put_berval( ber, bv, ber->ber_tag );
|
|
break;
|
|
|
|
case 's': /* string */
|
|
s = va_arg( ap, char * );
|
|
rc = ber_put_string( ber, s, ber->ber_tag );
|
|
break;
|
|
|
|
case 'B': /* bit string */
|
|
case 'X': /* bit string (deprecated) */
|
|
s = va_arg( ap, char * );
|
|
len = va_arg( ap, int ); /* in bits */
|
|
rc = ber_put_bitstring( ber, s, len, ber->ber_tag );
|
|
break;
|
|
|
|
case 't': /* tag for the next element */
|
|
ber->ber_tag = va_arg( ap, ber_tag_t );
|
|
ber->ber_usertag = 1;
|
|
break;
|
|
|
|
case 'v': /* vector of strings */
|
|
if ( (ss = va_arg( ap, char ** )) == NULL )
|
|
break;
|
|
for ( i = 0; ss[i] != NULL; i++ ) {
|
|
if ( (rc = ber_put_string( ber, ss[i],
|
|
ber->ber_tag )) == -1 )
|
|
break;
|
|
}
|
|
break;
|
|
|
|
case 'V': /* sequences of strings + lengths */
|
|
if ( (bvp = va_arg( ap, struct berval ** )) == NULL )
|
|
break;
|
|
for ( i = 0; bvp[i] != NULL; i++ ) {
|
|
if ( (rc = ber_put_berval( ber, bvp[i],
|
|
ber->ber_tag )) == -1 )
|
|
break;
|
|
}
|
|
break;
|
|
|
|
case '{': /* begin sequence */
|
|
rc = ber_start_seq( ber, ber->ber_tag );
|
|
break;
|
|
|
|
case '}': /* end sequence */
|
|
rc = ber_put_seqorset( ber );
|
|
break;
|
|
|
|
case '[': /* begin set */
|
|
rc = ber_start_set( ber, ber->ber_tag );
|
|
break;
|
|
|
|
case ']': /* end set */
|
|
rc = ber_put_seqorset( ber );
|
|
break;
|
|
|
|
default:
|
|
if( ber->ber_debug ) {
|
|
#ifdef NEW_LOGGING
|
|
LDAP_LOG(( "liblber", LDAP_LEVEL_ERR,
|
|
"ber_printf: unknown fmt %c\n", *fmt ));
|
|
#else
|
|
ber_log_printf( LDAP_DEBUG_ANY, ber->ber_debug,
|
|
"ber_printf: unknown fmt %c\n", *fmt );
|
|
#endif
|
|
}
|
|
rc = -1;
|
|
break;
|
|
}
|
|
|
|
if ( ber->ber_usertag == 0 )
|
|
ber->ber_tag = LBER_DEFAULT;
|
|
else
|
|
ber->ber_usertag = 0;
|
|
}
|
|
|
|
va_end( ap );
|
|
|
|
return rc;
|
|
}
|