/* ***** BEGIN LICENSE BLOCK *****
 * Version: MPL 1.1/GPL 2.0/LGPL 2.1
 *
 * The contents of this file are subject to the Mozilla Public License Version
 * 1.1 (the "License"); you may not use this file except in compliance with
 * the License. You may obtain a copy of the License at
 * http://www.mozilla.org/MPL/
 *
 * Software distributed under the License is distributed on an "AS IS" basis,
 * WITHOUT WARRANTY OF ANY KIND, either express or implied. See the License
 * for the specific language governing rights and limitations under the
 * License.
 *
 * The Original Code is Mozilla Communicator client code, released
 * March 31, 1998.
 *
 * The Initial Developer of the Original Code is
 * Netscape Communications Corporation.
 * Portions created by the Initial Developer are Copyright (C) 1998-1999
 * the Initial Developer. All Rights Reserved.
 *
 * Contributor(s):
 *
 * Alternatively, the contents of this file may be used under the terms of
 * either the GNU General Public License Version 2 or later (the "GPL"), or
 * the GNU Lesser General Public License Version 2.1 or later (the "LGPL"),
 * in which case the provisions of the GPL or the LGPL are applicable instead
 * of those above. If you wish to allow use of your version of this file only
 * under the terms of either the GPL or the LGPL, and not to allow others to
 * use your version of this file under the terms of the MPL, indicate your
 * decision by deleting the provisions above and replace them with the notice
 * and other provisions required by the GPL or the LGPL. If you do not delete
 * the provisions above, a recipient may use your version of this file under
 * the terms of any one of the MPL, the GPL or the LGPL.
 *
 * ***** END LICENSE BLOCK ***** */

/*
 * DNS callback functions for libldap that use the NSPR (Netscape
 * Portable Runtime) thread API.
 *
 */

#include "ldappr-int.h"

static LDAPHostEnt *prldap_gethostbyname( const char *name,
	LDAPHostEnt *result, char *buffer, int buflen, int *statusp,
	void *extradata );
static LDAPHostEnt *prldap_gethostbyaddr( const char *addr, int length,
	int type, LDAPHostEnt *result, char *buffer, int buflen,
	int *statusp, void *extradata );
static LDAPHostEnt *prldap_convert_hostent( LDAPHostEnt *ldhp,
	PRHostEnt *prhp );


/*
 * Install NSPR DNS functions into ld (if ld is NULL, they are installed
 * as the default functions for new LDAP * handles).
 *
 * Returns 0 if all goes well and -1 if not.
 */
int
prldap_install_dns_functions( LDAP *ld )
{
    struct ldap_dns_fns			dnsfns;

    memset( &dnsfns, '\0', sizeof(struct ldap_dns_fns) );
    dnsfns.lddnsfn_bufsize = PR_NETDB_BUF_SIZE;
    dnsfns.lddnsfn_gethostbyname = prldap_gethostbyname;
    dnsfns.lddnsfn_gethostbyaddr = prldap_gethostbyaddr;
    if ( ldap_set_option( ld, LDAP_OPT_DNS_FN_PTRS, (void *)&dnsfns ) != 0 ) {
	return( -1 );
    }

    return( 0 );
}


static LDAPHostEnt *
prldap_gethostbyname( const char *name, LDAPHostEnt *result,
	char *buffer, int buflen, int *statusp, void *extradata )
{
    PRHostEnt	prhent;

    if( !statusp || ( *statusp = (int)PR_GetIPNodeByName( name,
		PRLDAP_DEFAULT_ADDRESS_FAMILY, PR_AI_DEFAULT,
		buffer, buflen, &prhent )) == PR_FAILURE ) {
	return( NULL );
    }

    return( prldap_convert_hostent( result, &prhent ));
}


static LDAPHostEnt *
prldap_gethostbyaddr( const char *addr, int length, int type,
	LDAPHostEnt *result, char *buffer, int buflen, int *statusp,
	void *extradata )
{
    PRHostEnt	prhent;
    PRNetAddr	iaddr;

    if ( PR_SetNetAddr(PR_IpAddrNull, PRLDAP_DEFAULT_ADDRESS_FAMILY,
		0, &iaddr) == PR_FAILURE
		|| PR_StringToNetAddr( addr, &iaddr ) == PR_FAILURE ) {
	return( NULL );
    }

    if( !statusp || (*statusp = PR_GetHostByAddr(&iaddr, buffer,
	     buflen, &prhent )) == PR_FAILURE ) {
	return( NULL );
    }

    return( prldap_convert_hostent( result, &prhent ));
}


/*
 * Function: prldap_convert_hostent()
 * Description: copy the fields of a PRHostEnt struct to an LDAPHostEnt
 * Returns: the LDAPHostEnt pointer passed in.
 */
static LDAPHostEnt *
prldap_convert_hostent( LDAPHostEnt *ldhp, PRHostEnt *prhp )
{
	ldhp->ldaphe_name = prhp->h_name;
	ldhp->ldaphe_aliases = prhp->h_aliases;
	ldhp->ldaphe_addrtype = prhp->h_addrtype;
	ldhp->ldaphe_length =  prhp->h_length;
	ldhp->ldaphe_addr_list =  prhp->h_addr_list;
	return( ldhp );
}
