LDAP C API : ldap_next_attribute (ITS#778)

[markwhitehouse@home.com]

Full_Name: Mark Whitehouse
Version: 2.0.4
OS: Linux RH 6.2
URL: ftp://ftp.openldap.org/incoming/
Submission from: (NULL) (24.0.41.53)


Taken from draft-ietf-ldapext-ldap-c-api-04.txt:
  
  ldap_first_attribute() and ldap_next_attribute() will return NULL when
  the end of the attributes is reached, or if there is an error, in which
  case the error parameters in the session handle ld will be set to indi-
  cate the error.

The code below (taken from draft-ietf-ldapext-ldap-c-api-04.txt) illustrates
why this does not work correctly in OpenLDAP 2.0.4.

The last call to ldap_next_attribute() does return NULL as specified but always
sets LDAP_DECODING_ERROR flag.



---------------------------------------------begin code

#include <stdio.h>
#include <ldap.h>


/*
  draft-ietf-ldapext-ldap-c-api-04.txt:
  
  ldap_first_attribute() and ldap_next_attribute() will return NULL when
  the end of the attributes is reached, or if there is an error, in which
  case the error parameters in the session handle ld will be set to indi-
  cate the error.
*/

void checkError(LDAP *ld, char *a)
{
  if (a == NULL)
  {
    // ok we have end of attributes or error
    int ec;
    ldap_get_option(ld, LDAP_OPT_ERROR_NUMBER, &ec);
    if (ec != LDAP_SUCCESS)
    {
      // whoops we have an error here
      printf( "ERROR: %s (%d)\n", ldap_err2string(ec), ec);
    }
  }
}


main()
{
  LDAP            *ld;
  LDAPMessage     *res, *e;
  int             i, rc;
  char            *a, *dn;
  BerElement      *ptr;
  char            **vals;


  /* open an LDAP session */
  if ( (ld = ldap_init( "localhost", LDAP_PORT )) == NULL )
    return 1;
  
  /* authenticate as nobody */
  if (( rc = ldap_simple_bind_s( ld, NULL, NULL )) != LDAP_SUCCESS ) {
    fprintf( stderr, "ldap_simple_bind_s: %s\n",
             ldap_err2string( rc ));
    ldap_unbind( ld );
    return 1;
  }
  
  /* search for entries with cn of "Babs Jensen",return all attrs  */
  if (( rc = ldap_search_s( ld, "dc=mydomain,dc=com",
                            LDAP_SCOPE_SUBTREE,
                            "(objectclass=*)",
                            NULL, 0, &res ))
      != LDAP_SUCCESS )
  {
    fprintf( stderr, "ldap_search_s: %s\n",
             ldap_err2string( rc ));
    if ( res == NULL ) {
      ldap_unbind( ld );
      return 1;
    }
  }
  
  /* step through each entry returned */
  for ( e = ldap_first_entry( ld, res ); e != NULL;
        e = ldap_next_entry( ld, e ) )
  {
    /* print its name */
    dn = ldap_get_dn( ld, e );
    printf( "dn: %s\n", dn );
    ldap_memfree( dn );
    
    /* print each attribute */
    a = ldap_first_attribute( ld, e, &ptr );
    checkError(ld, a);
    while (a != NULL)
    {
      printf( "\tattribute: %s\n", a );
      
      /* print each value */
      vals = ldap_get_values( ld, e, a );
      for ( i = 0; vals[i] != NULL; i++ ) {
        printf( "\t\tvalue: %s\n", vals[i] );
      }
      ldap_value_free( vals );
      ldap_memfree( a );
      
      a = ldap_next_attribute( ld, e, ptr );
      checkError(ld, a);
    }
    if ( ptr != NULL ) {
      ber_free( ptr, 0 );
    }
  }
  
  /* free the search results */
  ldap_msgfree( res );
  
  /* close and free connection resources */
  ldap_unbind( ld );
  
  return 0;
}