/*
 * POP3Lite - 3lite POP3 Daemon
 * Copyright (C) 2000, 2001 Gergely Nagy <8@free.bsd.hu>
 *
 * This file is part of POP3Lite.
 *
 * POP3Lite 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.
 *
 * POP3LIte is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program; if not, write to the Free Software
 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
 */

/*
 * Original source: tcputils 0.6.2 by Thomas Bellman <Bellman@Lysator.LiU.Se>
 * tcputils is in the public domain.
 */

#ifdef HAVE_CONFIG_H
#	include <config.h>
#endif

#ifdef WITH_STANDALONE_SUPPORT

#include <stddef.h>
#include <string.h>
#include <stdlib.h>
#include <sys/types.h>
#include <sys/socket.h>
#include <netinet/in.h>
#include <arpa/inet.h>
#include <netdb.h>
#include <errno.h>
#include <unistd.h>

#include "standalone.h"

static const char rcsid[]="$Id: standalone.c,v 1.6 2001/01/12 15:59:00 algernon Exp $";

/*
 *  Fill in ADDR from HOST, SERVICE and PROTOCOL.
 *  PROTOCOL can be tcp or udp.
 *  Supplying a null pointer for HOST means use INADDR_ANY.
 *  Supplying a null pointer for SERVICE, means use port 0, i.e. no port.
 *
 *  Returns negative on errors, zero or positive if everything ok.
 */

int
get_inaddr ( struct sockaddr_in *addr, const char *host, const char *service,
	     const char *protocol )
{
	memset ( addr, 0, sizeof *addr );
	addr->sin_family = AF_INET;

	/*
	 *  Set host part of ADDR
	 */
	if ( host == NULL )
		addr->sin_addr.s_addr = INADDR_ANY;
	else
	{
		addr->sin_addr.s_addr = inet_addr ( host );
		if ( addr->sin_addr.s_addr == ( unsigned long ) - 1 )
		{
			struct hostent* hp;

			hp = gethostbyname ( host );
			if ( hp == NULL )
				return -1;

			memcpy ( &addr->sin_addr, hp->h_addr, hp->h_length );
			addr->sin_family = hp->h_addrtype;
		}
	}

	/*
	 *  Set port part of ADDR
	 */
	if ( service == NULL )
		addr->sin_port = htons ( 0 );
	else
	{
		char *end;
		long portno;

		portno = strtol ( service, &end, 10 );

		if ( portno > 0  &&  portno <= 65535
		     &&  end != service  &&  *end == '\0' )
			addr->sin_port = htons ( portno );
		else
		{
			struct servent *serv;

			serv = getservbyname ( service, protocol );
			if ( serv == NULL )
				return -1;
			addr->sin_port = serv->s_port;
		}
	}

	return 0;
}

/*
 *  Open a TCP socket listening on address LOCAL.
 *  Returns the file descriptor for the socket, or negative
 *  on errors.
 */

int
tcp_listen_2 ( const struct sockaddr_in *local )
{
	int s;
	struct protoent *proto;

	proto = getprotobyname ( "tcp" );
	if ( proto == NULL )
		return -1;

	s = socket ( PF_INET, SOCK_STREAM, proto->p_proto );
	if ( s < 0 )
		return -1;
	{
		int yes = 1;
		setsockopt ( s, SOL_SOCKET, SO_REUSEADDR, (char *) &yes, sizeof yes );
	}

	if ( bind ( s, (struct sockaddr *)local, sizeof *local ) < 0 )
	{
		close ( s );
		return -1;
	}

	if ( listen ( s, 256 ) < 0 ) 
	{
		close ( s );
		return -1;
	}

	return s;
}

int
tcp_listen ( const char *interface, const char *port )
{
	int s;
	struct sockaddr_in server;

	if ( get_inaddr ( &server, interface, port, "tcp" ) < 0 )
		return -1;

	s = tcp_listen_2 ( &server );

	return s;
}

#endif /* WITH_STANDALONE_SUPPORT */