/***************************************************************************
 *   Copyright (C) 2003 by Torben Nielsen                                  *
 *   torben.nielsen@rocketmail.com                                         *
 *                                                                         *
 *   This program is free software; you can redistribute it and/or modify  *
 *   it under the terms of the GNU General Public License as published by  *
 *   the Free Software Foundation; either version 2 of the License, or     *
 *   (at your option) any later version.                                   *
 ***************************************************************************/
#include "dnshelper.h"

#include <sys/types.h>
#include <netdb.h>
#include <sys/socket.h>
#include <netinet/in.h>
#include <arpa/inet.h>

using std::string;

std::string DnsHelper::getIp(const std::string& hostname)
{
	if ( hostname == "" )
		return "";
	hostent *hostptr = gethostbyname( hostname.c_str() );

	if (hostptr == 0)
		return ("");

	in_addr *ptr;
	char **listptr = hostptr->h_addr_list;
	ptr = (struct in_addr *) *listptr;

	if (ptr == 0)
		return "not found";
	else
		return inet_ntoa(*ptr);
}

std::string DnsHelper::getHostname(const std::string& ipaddress)
{
	if ( ipaddress == "" )
		return "";

	sockaddr_in sin;

	bzero( (caddr_t *) &sin,sizeof( sin ) ); // clear out the structure
	sin.sin_family = AF_INET;  // set the family (only AF_INET is valid
	sin.sin_addr.s_addr = inet_addr( ipaddress.c_str() ); // convert from dottet decimal to 32 bit long int
	hostent *hostptr = gethostbyaddr( (char *)&(sin.sin_addr), sizeof(sin.sin_addr), (int)sin.sin_family);

	if (hostptr == 0)
		return "not found";
	else
		return hostptr->h_name;
}