forked from osmocom/wireshark
101 lines
3.0 KiB
C
101 lines
3.0 KiB
C
/* packet-udp.c
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* Routines for UDP packet disassembly
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*
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* $Id: packet-udp.c,v 1.5 1998/10/14 04:09:13 gram Exp $
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*
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* Ethereal - Network traffic analyzer
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* By Gerald Combs <gerald@zing.org>
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* Copyright 1998 Gerald Combs
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*
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License
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* as published by the Free Software Foundation; either version 2
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* of the License, or (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
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*/
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#ifdef HAVE_CONFIG_H
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# include "config.h"
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#endif
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#include <gtk/gtk.h>
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#include <stdio.h>
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#ifdef HAVE_SYS_TYPES_H
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# include <sys/types.h>
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#endif
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#ifdef HAVE_NETINET_IN_H
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# include <netinet/in.h>
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#endif
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#include "ethereal.h"
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#include "packet.h"
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#include "resolv.h"
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void
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dissect_udp(const u_char *pd, int offset, frame_data *fd, GtkTree *tree) {
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e_udphdr *uh;
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guint16 uh_sport, uh_dport, uh_ulen, uh_sum;
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GtkWidget *udp_tree, *ti;
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/* To do: Check for {cap len,pkt len} < struct len */
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uh = (e_udphdr *) &pd[offset];
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uh_sport = ntohs(uh->uh_sport);
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uh_dport = ntohs(uh->uh_dport);
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uh_ulen = ntohs(uh->uh_ulen);
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uh_sum = ntohs(uh->uh_sum);
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if (fd->win_info[COL_NUM]) {
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strcpy(fd->win_info[COL_PROTOCOL], "UDP");
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sprintf(fd->win_info[COL_INFO], "Source port: %s Destination port: %s",
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get_udp_port(uh_sport), get_udp_port(uh_dport));
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}
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if (tree) {
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ti = add_item_to_tree(GTK_WIDGET(tree), offset, 8,
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"User Datagram Protocol");
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udp_tree = gtk_tree_new();
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add_subtree(ti, udp_tree, ETT_UDP);
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add_item_to_tree(udp_tree, offset, 2, "Source port: %s", get_udp_port(uh_sport));
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add_item_to_tree(udp_tree, offset + 2, 2, "Destination port: %s", get_udp_port(uh_dport));
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add_item_to_tree(udp_tree, offset + 4, 2, "Length: %d", uh_ulen);
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add_item_to_tree(udp_tree, offset + 6, 2, "Checksum: 0x%04x", uh_sum);
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}
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/* Skip over header */
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offset += 8;
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/* To do: make sure we aren't screwing ourselves with the MIN call. */
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switch (MIN(uh_sport, uh_dport)) {
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case UDP_PORT_BOOTPS:
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dissect_bootp(pd, offset, fd, tree);
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break;
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case UDP_PORT_DNS:
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dissect_dns(pd, offset, fd, tree);
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break;
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case UDP_PORT_RIP:
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/* we should check the source port too (RIP: UDP src and dst port 520) */
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dissect_rip(pd, offset, fd, tree);
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break;
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case UDP_PORT_NBNS:
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dissect_nbns(pd, offset, fd, tree);
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break;
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case UDP_PORT_IPX: /* RFC 1234 */
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dissect_ipx(pd, offset, fd, tree);
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break;
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default:
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dissect_data(pd, offset, fd, tree);
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}
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}
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