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/* packet-udp.c
* Routines for UDP packet disassembly
*
* $Id: packet-udp.c,v 1.2 1998/09/16 03:22:13 gerald Exp $
*
* Ethereal - Network traffic analyzer
* By Gerald Combs <gerald@zing.org>
* Copyright 1998 Gerald Combs
*
*
* 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.
*/
#ifdef HAVE_CONFIG_H
# include "config.h"
#endif
#include <gtk/gtk.h>
#include <stdio.h>
#ifdef HAVE_SYS_TYPES_H
# include <sys/types.h>
#endif
#ifdef HAVE_NETINET_IN_H
# include <netinet/in.h>
#endif
#include "ethereal.h"
#include "packet.h"
#include "resolv.h"
void
dissect_udp(const u_char *pd, int offset, frame_data *fd, GtkTree *tree) {
e_udphdr *uh;
guint16 uh_sport, uh_dport, uh_ulen, uh_sum;
GtkWidget *udp_tree, *ti;
/* To do: Check for {cap len,pkt len} < struct len */
uh = (e_udphdr *) &pd[offset];
uh_sport = ntohs(uh->uh_sport);
uh_dport = ntohs(uh->uh_dport);
uh_ulen = ntohs(uh->uh_ulen);
uh_sum = ntohs(uh->uh_sum);
if (fd->win_info[0]) {
strcpy(fd->win_info[3], "UDP");
sprintf(fd->win_info[4], "Source port: %s Destination port: %s",
get_udp_port(uh_sport), get_udp_port(uh_dport));
}
if (tree) {
ti = add_item_to_tree(GTK_WIDGET(tree), offset, 8,
"User Datagram Protocol");
udp_tree = gtk_tree_new();
add_subtree(ti, udp_tree, ETT_UDP);
add_item_to_tree(udp_tree, offset, 2, "Source port: %s", get_udp_port(uh_sport));
add_item_to_tree(udp_tree, offset + 2, 2, "Destination port: %s", get_udp_port(uh_dport));
add_item_to_tree(udp_tree, offset + 4, 2, "Length: %d", uh_ulen);
add_item_to_tree(udp_tree, offset + 6, 2, "Checksum: 0x%04x", uh_sum);
}
/* Skip over header */
offset += 8;
/* To do: make sure we aren't screwing ourselves with the MIN call. */
switch (MIN(uh_sport, uh_dport)) {
case UDP_PORT_BOOTPS:
dissect_bootp(pd, offset, fd, tree);
break;
case UDP_PORT_DNS:
dissect_dns(pd, offset, fd, tree);
break;
case UDP_PORT_RIP:
/* we should check the source port too (RIP: UDP src and dst port 520) */
dissect_rip(pd, offset, fd, tree);
break;
default:
dissect_data(pd, offset, fd, tree);
}
}
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