libraries/libldap/getattr.c

   1 /* $OpenLDAP$ */
   2 /* This work is part of OpenLDAP Software <http://www.openldap.org/>.
   3  *
   4  * Copyright 1998-2024 The OpenLDAP Foundation.
   5  * All rights reserved.
   6  *
   7  * Redistribution and use in source and binary forms, with or without
   8  * modification, are permitted only as authorized by the OpenLDAP
   9  * Public License.
  10  *
  11  * A copy of this license is available in the file LICENSE in the
  12  * top-level directory of the distribution or, alternatively, at
  13  * <http://www.OpenLDAP.org/license.html>.
  14  */
  15 /* Portions Copyright (c) 1990 Regents of the University of Michigan.
  16  * All rights reserved.
  17  */
  18
  19 #include "portable.h"
  20
  21 #include <stdio.h>
  22 #include <ac/stdlib.h>
  23
  24 #include <ac/socket.h>
  25 #include <ac/string.h>
  26 #include <ac/time.h>
  27
  28 #include "ldap-int.h"
  29
  30 char *
  31 ldap_first_attribute( LDAP *ld, LDAPMessage *entry, BerElement **berout )
  32 {
  33         int rc;
  34         ber_tag_t tag;
  35         ber_len_t len = 0;
  36         char *attr;
  37         BerElement *ber;
  38
  39         Debug0( LDAP_DEBUG_TRACE, "ldap_first_attribute\n" );
  40
  41         assert( ld != NULL );
  42         assert( LDAP_VALID( ld ) );
  43         assert( entry != NULL );
  44         assert( berout != NULL );
  45
  46         *berout = NULL;
  47
  48         ber = ldap_alloc_ber_with_options( ld );
  49         if( ber == NULL ) {
  50                 return NULL;
  51         }
  52
  53         *ber = *entry->lm_ber;
  54
  55         /*
  56          * Skip past the sequence, dn, sequence of sequence leaving
  57          * us at the first attribute.
  58          */
  59
  60         tag = ber_scanf( ber, "{xl{" /*}}*/, &len );
  61         if( tag == LBER_ERROR ) {
  62                 ld->ld_errno = LDAP_DECODING_ERROR;
  63                 ber_free( ber, 0 );
  64                 return NULL;
  65         }
  66
  67         /* set the length to avoid overrun */
  68         rc = ber_set_option( ber, LBER_OPT_REMAINING_BYTES, &len );
  69         if( rc != LBER_OPT_SUCCESS ) {
  70                 ld->ld_errno = LDAP_LOCAL_ERROR;
  71                 ber_free( ber, 0 );
  72                 return NULL;
  73         }
  74
  75         if ( ber_pvt_ber_remaining( ber ) == 0 ) {
  76                 assert( len == 0 );
  77                 ber_free( ber, 0 );
  78                 return NULL;
  79         }
  80         assert( len != 0 );
  81
  82         /* snatch the first attribute */
  83         tag = ber_scanf( ber, "{ax}", &attr );
  84         if( tag == LBER_ERROR ) {
  85                 ld->ld_errno = LDAP_DECODING_ERROR;
  86                 ber_free( ber, 0 );
  87                 return NULL;
  88         }
  89
  90         *berout = ber;
  91         return attr;
  92 }
  93
  94 /* ARGSUSED */
  95 char *
  96 ldap_next_attribute( LDAP *ld, LDAPMessage *entry, BerElement *ber )
  97 {
  98         ber_tag_t tag;
  99         char *attr;
 100
 101         Debug0( LDAP_DEBUG_TRACE, "ldap_next_attribute\n" );
 102
 103         assert( ld != NULL );
 104         assert( LDAP_VALID( ld ) );
 105         assert( entry != NULL );
 106         assert( ber != NULL );
 107
 108         if ( ber_pvt_ber_remaining( ber ) == 0 ) {
 109                 return NULL;
 110         }
 111
 112         /* skip sequence, snarf attribute type, skip values */
 113         tag = ber_scanf( ber, "{ax}", &attr );
 114         if( tag == LBER_ERROR ) {
 115                 ld->ld_errno = LDAP_DECODING_ERROR;
 116                 return NULL;
 117         }
 118
 119         return attr;
 120 }
 121
 122 /* Fetch attribute type and optionally fetch values. The type
 123  * and values are referenced in-place from the BerElement, they are
 124  * not dup'd into malloc'd memory.
 125  */
 126 /* ARGSUSED */
 127 int
 128 ldap_get_attribute_ber( LDAP *ld, LDAPMessage *entry, BerElement *ber,
 129         BerValue *attr, BerVarray *vals )
 130 {
 131         ber_tag_t tag;
 132         int rc = LDAP_SUCCESS;
 133
 134         Debug0( LDAP_DEBUG_TRACE, "ldap_get_attribute_ber\n" );
 135
 136         assert( ld != NULL );
 137         assert( LDAP_VALID( ld ) );
 138         assert( entry != NULL );
 139         assert( ber != NULL );
 140         assert( attr != NULL );
 141
 142         attr->bv_val = NULL;
 143         attr->bv_len = 0;
 144
 145         if ( ber_pvt_ber_remaining( ber ) ) {
 146                 ber_len_t siz = sizeof( BerValue );
 147
 148                 /* skip sequence, snarf attribute type */
 149                 tag = ber_scanf( ber, vals ? "{mM}" : "{mx}", attr, vals,
 150                         &siz, (ber_len_t)0 );
 151                 if( tag == LBER_ERROR ) {
 152                         rc = ld->ld_errno = LDAP_DECODING_ERROR;
 153                 }
 154         }
 155
 156         return rc;
 157 }