hlswmaster/src/plugin_helper.c

/***************************************************************************
 *   Copyright (C) 03/2005 by Olaf Rempel                                  *
 *   razzor@kopf-tisch.de                                                  *
 *                                                                         *
 *   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.                                   *
 *                                                                         *
 *   This program 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.             *
 ***************************************************************************/
#include <stdio.h>
#include <stdlib.h>
#include <unistd.h>
#include <string.h>
#include <sys/socket.h>
#include <netinet/in.h>
#include <netinet/ip.h>
#include <arpa/inet.h>

#include "hlswmaster.h"
#include "plugin.h"
#include "netpkt.h"

/**
 * pkt_queue()
 * erzeugt ein net_pkt aus den parametern und legt es in die send queue
 *
 * @param struct in_addr *dstip - pointer auf eine IP, wenn NULL wird broadcast angenommen
 * @param unsigned int dstport - destination port
 * @param char *buf - pointer auf den zu sendenen speicherbereich
 * @param unsigned int size - groesse des speicherbereichs
 * @return false bei fehler
 */
int pkt_send(struct in_addr *dstip, unsigned int dstport, char *buf, unsigned int size) {
	struct net_pkt *pkt;

	if (!(pkt = malloc(sizeof(struct net_pkt) + size)))
		return 0;

	INIT_LIST_HEAD(&pkt->list);

	pkt->addr.sin_family = AF_INET;
	pkt->addr.sin_port = htons(dstport);
	pkt->addr.sin_addr.s_addr = (dstip ? dstip->s_addr : 0xFFFFFFFF);

	pkt->size = size;
	memcpy(pkt->buf, buf, size);

	pkt_queue(pkt);
	return 1;
}

/**
 * pkt_queue_portarr()
 * erzeugt ein net_pkt aus den parametern und legt es in die send queue
 *
 * @param char *dstip - pointer auf eine IP, wenn NULL wird broadcast angenommen
 * @param struct scan_ports *port_arr
 * @param char *buf - pointer auf den zu sendenen speicherbereich
 * @param unsigned int size - groesse des speicherbereichs
 * @return false bei fehler
 */
int pkt_send_portarr(struct in_addr *dstip, struct scan_ports *portarr, char *buf, unsigned int size) {
	unsigned short port;
	while (portarr && portarr->portlo) {
		for (port = portarr->portlo; port <= portarr->porthi; port++)
			pkt_send(dstip, port, buf, size);
		
		portarr++;
	}
	return 1;
}


/**
 * pkt_check_portarr()
 * prueft ob der src-port des pakets in der portliste vorhanden ist
 *
 * @param struct net_pkt *pkt
 * @param struct scan_ports *port_arr
 * @return die gameid der portrange oder 0 wenn nicht vorhanden
 */
int pkt_check_portarr(struct net_pkt *pkt, struct scan_ports *portarr) {
	unsigned short port;
	while (portarr && portarr->portlo) {
		for (port = portarr->portlo; port <= portarr->porthi; port++)
			if (port == ntohs(pkt->addr.sin_port))
				return portarr->gameid;
		
		portarr++;
	}
	return 0;
}

/**
 * pkt_memcmp()
 * vergleicht das Paket mit einem Speicherbereich
 *
 * @param struct net_pkt *pkt
 * @param unsigned int offset
 * @param char *search
 * @param unsigned int size
 * @return true wenn gleich
 */
int pkt_memcmp(struct net_pkt *pkt, unsigned int offset, char *search, unsigned int size) {

	if (offset >= pkt->size)
		return 1;

	if (offset + size >= pkt->size)
		size = pkt->size - offset;

	return memcmp(pkt->buf, search, size);
}

/**
 * server_add_pkt()
 * fuegt der serverliste einen server hinzu
 *
 * @param unsigned int gameid
 * @param struct net_pkt *pkt
 * @return false bei fehler
 */
int server_add_pkt(unsigned int gameid, struct net_pkt *pkt) {
	return server_add(gameid, &pkt->addr.sin_addr, pkt->addr.sin_port, 0);
}