igmp.c

Nast是一个基于Libnet 和Libpcap的sniffer包和LAN分析器。它可以在通常模式或混合模式下检查通过网络接口的数据包

/*
    nast

    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 "include/nast.h"

void handle_IGMP (FILE *output)
{
   struct libnet_ipv4_hdr *ip;
   struct libnet_igmp_hdr *igmp;
   
   ip = (struct libnet_ipv4_hdr *) (packet + offset);
   igmp = (struct libnet_igmp_hdr *) (packet + LIBNET_IPV4_H + offset);

   fprintf(output, "\n---[ IGMP ]----------------------------------------------------------\n");
   fprintf(output, "%s -> %s\n", inet_ntoa(ip->ip_src), inet_ntoa(ip->ip_dst));
   fprintf(output, "IP Version: %d\t Lenght: %d\t", ip->ip_v, ntohs(ip->ip_len));
   fprintf(output, "TTL: %d\t Code: %d\n", ip->ip_ttl, igmp->igmp_code);
   fprintf(output, "Type: ");

   switch(igmp->igmp_type)
     {
      case 0x11:
	fprintf(output, "Membreship Query v1 [get address %s]\n", inet_ntoa(igmp->igmp_group));
	break;
      case 0x12:
	fprintf(output, "Membership Report v1  %s\n", inet_ntoa(igmp->igmp_group));
	break;
      case 0x16:
	fprintf(output, "Membership Report v2  %s\n", inet_ntoa(igmp->igmp_group));
	break;
      case 0x17:
	fprintf(output, "Leave %s (v2)\n", inet_ntoa(igmp->igmp_group));
	break;
      default:
	fprintf(output, "%d\n", igmp->igmp_type);
	break;
     }
}