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/* packet-arp.c
* Routines for ARP packet disassembly
*
* 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 <pcap.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 "etypes.h"
void
dissect_arp(const u_char *pd, int offset, frame_data *fd, GtkTree *tree) {
e_ether_arp *ea;
guint16 ar_hrd, ar_pro, ar_op;
gchar *req_type[] = { "ARP request", "ARP reply",
"RARP request", "RARP reply" };
GtkWidget *arp_tree, *ti;
/* To do: Check for {cap len,pkt len} < struct len */
ea = (e_ether_arp *) &pd[offset];
ar_hrd = ntohs(ea->ar_hrd);
ar_pro = ntohs(ea->ar_pro);
/* To do: Check for bounds on ar_op */
ar_op = ntohs(ea->ar_op);
if (fd->win_info[0]) { strcpy(fd->win_info[3], "ARP"); }
if (tree) {
ti = add_item_to_tree(GTK_WIDGET(tree), offset, 28, req_type[ar_op - 1]);
arp_tree = gtk_tree_new();
add_subtree(ti, arp_tree, ETT_ARP);
add_item_to_tree(arp_tree, offset, 2,
"Hardware type: 0x%04x", ar_hrd);
add_item_to_tree(arp_tree, offset + 2, 2,
"Protocol type: 0x%04x", ar_pro);
add_item_to_tree(arp_tree, offset + 4, 1,
"Hardware size: 0x%02x", ea->ar_hln);
add_item_to_tree(arp_tree, offset + 5, 1,
"Protocol size: 0x%02x", ea->ar_pln);
add_item_to_tree(arp_tree, offset + 6, 2,
"Opcode: 0x%04x", ar_op);
add_item_to_tree(arp_tree, offset + 8, 6,
"Sender ether: %s", ether_to_str((guint8 *) ea->arp_sha));
add_item_to_tree(arp_tree, offset + 14, 4,
"Sender IP: %s", ip_to_str((guint8 *) ea->arp_spa));
add_item_to_tree(arp_tree, offset + 18, 6,
"Target ether: %s", ether_to_str((guint8 *) ea->arp_tha));
add_item_to_tree(arp_tree, offset + 24, 4,
"Target IP: %s", ip_to_str((guint8 *) ea->arp_tpa));
}
if (ar_pro != ETHERTYPE_IP && fd->win_info[0]) {
sprintf(fd->win_info[4], "h/w %d (%d) prot %d (%d) op 0x%04x",
ar_hrd, ea->ar_hln, ar_pro, ea->ar_pln, ar_op);
return;
}
switch (ar_op) {
case ARPOP_REQUEST:
if (fd->win_info[0]) {
sprintf(fd->win_info[4], "Who has %s? Tell %s",
ip_to_str((guint8 *) ea->arp_tpa), ip_to_str((guint8 *) ea->arp_spa));
}
break;
case ARPOP_REPLY:
if (fd->win_info[0]) {
sprintf(fd->win_info[4], "%s is at %s",
ip_to_str((guint8 *) ea->arp_spa),
ether_to_str((guint8 *) ea->arp_sha));
}
break;
case ARPOP_RREQUEST:
if (fd->win_info[0]) {
strcpy(fd->win_info[3], "RARP");
sprintf(fd->win_info[4], "Who is %s? Tell %s",
ether_to_str((guint8 *) ea->arp_tha),
ether_to_str((guint8 *) ea->arp_sha));
}
break;
case ARPOP_RREPLY:
if (fd->win_info[0]) {
strcpy(fd->win_info[3], "RARP");
sprintf(fd->win_info[4], "%s is at %s",
ether_to_str((guint8 *) ea->arp_sha),
ip_to_str((guint8 *) ea->arp_spa));
}
break;
}
}
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