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/*
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"
/* read data stream */
int stream (char *dev,u_long ip_src,u_long ip_dst,u_short sport,u_short dport,int lg)
{
char errbuf[LIBNET_ERRBUF_SIZE];
struct libnet_ipv4_hdr *ip;
struct libnet_tcp_hdr *tcp;
char *data;
int n;
u_short TCP_SIZE_H;
if(lg)
{
openfile();
printf ("Running and logging to file...\n");
}
fputs("NAST TCP Stream\n\n",logd);
tm = time(NULL);
/* per avere sia ora che data si pu usare %c, ma il compilatore tira fuori dei warning decisamente noiosi:)*/
strftime(timed,60,"%b %d %T",localtime(&tm));
if ((descr = pcap_open_live (dev, BUFSIZ, PROMISC, 10, errbuf)) == NULL)
{
w_error(1, "pcap_open_live: %s\n", errbuf);
}
data = malloc (1024);
if ((offset=(device(dev,descr)))==-1) return -1;
for (;;)
{
packet = (u_char *) pcap_next(descr, &hdr);
if (packet == NULL) break;
ip = (struct libnet_ipv4_hdr *) (packet + offset);
if (ip->ip_p != IPPROTO_TCP) continue;
tcp = (struct libnet_tcp_hdr *) (packet + offset + LIBNET_IPV4_H);
TCP_SIZE_H = tcp->th_off*4;
if ((n=ntohs(ip->ip_len) - LIBNET_IPV4_H - TCP_SIZE_H)<1) continue;
/* caso diritto */
if ( ip->ip_src.s_addr == ip_src && ip->ip_dst.s_addr == ip_dst && tcp->th_sport == htons(sport) && tcp->th_dport == htons(dport) )
{
fprintf(logd,"\n%s->%s\n", libnet_addr2name4(ip_src, LIBNET_RESOLVE) , libnet_addr2name4(ip_dst, LIBNET_RESOLVE));
data = (char *) (packet + offset + LIBNET_IPV4_H + TCP_SIZE_H);
data_sniffo(data, n, logd);
}
/* caso rovescio */
else if ( ip->ip_src.s_addr == ip_dst && ip->ip_dst.s_addr == ip_src && tcp->th_sport == htons(dport) && tcp->th_dport == htons(sport))
{
fprintf(logd,"\n%s<-%s\n", libnet_addr2name4(ip_src, LIBNET_RESOLVE) , libnet_addr2name4(ip_dst, LIBNET_RESOLVE));
data = (char *) (packet + offset + LIBNET_IPV4_H + TCP_SIZE_H);
data_sniffo(data, n, logd);
}
}
pcap_close(descr);
return 0;
}
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