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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"
/* handle a tcp packet */
void handle_TCP (u_short d, u_short x, FILE *output, FILE *ldd)
{
struct libnet_ipv4_hdr *ip;
struct libnet_tcp_hdr *tcp;
struct servent *service;
u_char flags;
u_short size_ip, size_tcp, size_buf;
size_ip = LIBNET_IPV4_H;
size_buf = 0;
buf = NULL;
ip = (struct libnet_ipv4_hdr *) (packet+offset);
tcp = (struct libnet_tcp_hdr *) (packet+size_ip+offset);
size_tcp = (tcp->th_off) * 4;
n_print("princ",line_s,row_s,lg,"\n---[ TCP ]-----------------------------------------------------------\n");
service = getservbyport(htons(ntohs(tcp->th_sport)), "tcp");
n_print("princ",line_s=line_s+2,row_s,lg,"%s:%d(%s)",inet_ntoa(ip->ip_src),ntohs(tcp->th_sport),(service) ? service->s_name : "unknown");
service = getservbyport(htons(ntohs(tcp->th_dport)), "tcp");
n_print("princ",line_s,28,lg," -> ");
n_print("princ",line_s,33,lg,"%s:%d(%s)\n",inet_ntoa(ip->ip_dst),ntohs(tcp->th_dport),(service) ? service->s_name : "unknown");
n_print("princ",++line_s,row_s,lg,"TTL: %d \t", ip->ip_ttl);
n_print("princ",line_s,10,lg,"Window: %d\t", ntohs(tcp->th_win));
n_print("princ",line_s,25,lg,"Version: %d\t", ip->ip_v);
n_print("princ",line_s,39,lg,"Length: %d\n", ntohs(ip->ip_len));
n_print("princ",++line_s,row_s,lg,"FLAGS: ");
/*modifed by embyte */
flags = tcp->th_flags;
row_s = 8;
if (flags & TH_FIN) /*se mascherando con il fin ottengo 1 vuol dire che c�(l'and �1 se tutti e due sono 1) */
n_print("princ",line_s,++row_s,lg,"F");
else
n_print("princ",line_s,++row_s,lg,"-");
if (flags & TH_SYN)
n_print("princ",line_s,++row_s,lg,"S");
else
n_print("princ",line_s,++row_s,lg,"-");
if (flags & TH_RST)
n_print("princ",line_s,++row_s,lg,"R");
else
n_print("princ",line_s,++row_s,lg,"-");
if (flags & TH_PUSH)
n_print("princ",line_s,++row_s,lg,"P");
else
n_print("princ",line_s,++row_s,lg,"-");
if (flags & TH_ACK)
n_print("princ",line_s,++row_s,lg,"A");
else
n_print("princ",line_s,++row_s,lg,"-");
if (flags & TH_URG)
n_print("princ",line_s,++row_s,lg,"U");
else
n_print("princ",line_s,++row_s,lg,"-");
if (flags & 0x80)
n_print("princ",line_s,++row_s,lg,"U");
else
n_print("princ",line_s,++row_s,lg,"-");
if (flags & 0x40)
n_print("princ",line_s,++row_s,lg,"E");
n_print("princ",line_s,16,lg,"\tSEQ: %u - ACK: %u\n", ntohl(tcp->th_seq),ntohl(tcp->th_ack));
n_print("princ",++line_s,0,lg,"Packet Number: %d",npkt);
if(!graph)
printf("\n");
row_s=0;
++line_s;
size_buf = ntohs(ip->ip_len) - size_ip - size_tcp;
if (size_buf)
{
buf = (char *) (packet + offset + size_ip + size_tcp);
if (d)
{
n_print("princ",line_s,row_s,lg,"\n---[ TCP Data ]------------------------------------------------------\n");
data_sniffo (buf, size_buf, output);
}
if (x)
{
n_print("princ",line_s,row_s,lg,"\n---[ TCP Hex-Ascii Data ]--------------------------------------------");
print_ascii_hex (buf, size_buf, output);
}
/* log data (payload only) */
if (ldd)
{
service = getservbyport(htons(ntohs(tcp->th_sport)), "tcp");
fprintf(ldd, "%s:%d(%s) -> ",inet_ntoa(ip->ip_src),ntohs(tcp->th_sport),(service) ? service->s_name : "unknown");
service = getservbyport(htons(ntohs(tcp->th_dport)), "tcp");
fprintf(ldd, "%s:%d(%s) TCP\n",inet_ntoa(ip->ip_dst),ntohs(tcp->th_dport),(service) ? service->s_name : "unknown");
data_sniffo (buf, size_buf, ldd);
fprintf(ldd, "\n");
}
}
row_s = 0;
}
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