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/*
nast
Copyright (C) 2002 Snifth
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 udp packet */
void handle_UDP (u_short d, u_short x, FILE *output, FILE *ldd)
{
struct libnet_ipv4_hdr *ip;
struct libnet_udp_hdr *udp;
struct servent *service;
u_short size_buf, size_ip, size_udp;
size_ip = LIBNET_IPV4_H;
size_udp = LIBNET_UDP_H;
size_buf = 0;
ip = (struct libnet_ipv4_hdr *) (packet+offset);
udp = (struct libnet_udp_hdr *) (packet+size_ip+offset);
service = getservbyport (htons(ntohs(udp->uh_sport)), "udp");
n_print("princ",line_s,row_s,lg,"\n---[ UDP ]-----------------------------------------------------------\n");
n_print("princ",line_s=line_s+2,row_s,lg,"%s:%d(%s)", inet_ntoa (ip->ip_src), ntohs(udp->uh_sport), (service) ? service->s_name : "unknown");
service = getservbyport(htons(ntohs(udp->uh_dport)), "udp");
n_print("princ",line_s,28,lg," -> ");
n_print("princ",line_s,33,lg,"%s:%d(%s)\n", inet_ntoa(ip->ip_dst), ntohs(udp->uh_dport), (service) ? service->s_name : "unknown");
n_print("princ",++line_s,row_s,lg,"Version: %d\t Total Length: %d\t", ip->ip_v, ntohs(ip->ip_len));
n_print("princ",line_s,39,lg, "TTL: %d\n", ip->ip_ttl);
n_print("princ",++line_s,0,lg,"Packet Number: %d",npkt);
if(!graph)
printf("\n");
size_buf = ntohs(ip->ip_len) - size_ip - size_udp;
++line_s;
row_s=0;
/* there is a payload */
if (size_buf)
{
buf = (char *) (packet + size_ip + size_udp + offset);
if (d)
{
n_print("princ",line_s,row_s,lg,"\n---[ UDP Data ]------------------------------------------------------\n");
data_sniffo (buf, size_buf, output);
}
if (x)
{
n_print("princ",line_s,row_s,lg,"\n---[ UDP Hex-Ascii Data ]--------------------------------------------");
print_ascii_hex (buf, size_buf, output);
}
/* log data (payload only) */
if (ldd)
{
service = getservbyport (htons(ntohs(udp->uh_sport)), "udp");
fprintf(ldd, "%s:%d(%s) -> ", inet_ntoa (ip->ip_src), ntohs(udp->uh_sport), (service) ? service->s_name : "unknown");
service = getservbyport(htons(ntohs(udp->uh_dport)), "udp");
fprintf(ldd, "%s:%d(%s) UDP\n", inet_ntoa(ip->ip_dst), ntohs(udp->uh_dport), (service) ? service->s_name : "unknown");
data_sniffo (buf, size_buf, ldd);
fprintf(ldd, "\n");
}
}
row_s=0;
}
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