2 * Routines for ARP packet disassembly
4 * $Id: packet-arp.c,v 1.3 1998/09/27 22:12:26 gerald Exp $
6 * Ethereal - Network traffic analyzer
7 * By Gerald Combs <gerald@zing.org>
8 * Copyright 1998 Gerald Combs
11 * This program is free software; you can redistribute it and/or
12 * modify it under the terms of the GNU General Public License
13 * as published by the Free Software Foundation; either version 2
14 * of the License, or (at your option) any later version.
16 * This program is distributed in the hope that it will be useful,
17 * but WITHOUT ANY WARRANTY; without even the implied warranty of
18 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
19 * GNU General Public License for more details.
21 * You should have received a copy of the GNU General Public License
22 * along with this program; if not, write to the Free Software
23 * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
35 #ifdef HAVE_SYS_TYPES_H
36 # include <sys/types.h>
39 #ifdef HAVE_NETINET_IN_H
40 # include <netinet/in.h>
48 dissect_arp(const u_char *pd, int offset, frame_data *fd, GtkTree *tree) {
50 guint16 ar_hrd, ar_pro, ar_op;
51 gchar *req_type[] = { "ARP request", "ARP reply",
52 "RARP request", "RARP reply" };
53 GtkWidget *arp_tree, *ti;
55 /* To do: Check for {cap len,pkt len} < struct len */
56 ea = (e_ether_arp *) &pd[offset];
57 ar_hrd = ntohs(ea->ar_hrd);
58 ar_pro = ntohs(ea->ar_pro);
59 /* To do: Check for bounds on ar_op */
60 ar_op = ntohs(ea->ar_op);
62 if (fd->win_info[COL_NUM]) { strcpy(fd->win_info[COL_PROTOCOL], "ARP"); }
65 ti = add_item_to_tree(GTK_WIDGET(tree), offset, 28, req_type[ar_op - 1]);
66 arp_tree = gtk_tree_new();
67 add_subtree(ti, arp_tree, ETT_ARP);
68 add_item_to_tree(arp_tree, offset, 2,
69 "Hardware type: 0x%04x", ar_hrd);
70 add_item_to_tree(arp_tree, offset + 2, 2,
71 "Protocol type: 0x%04x", ar_pro);
72 add_item_to_tree(arp_tree, offset + 4, 1,
73 "Hardware size: 0x%02x", ea->ar_hln);
74 add_item_to_tree(arp_tree, offset + 5, 1,
75 "Protocol size: 0x%02x", ea->ar_pln);
76 add_item_to_tree(arp_tree, offset + 6, 2,
77 "Opcode: 0x%04x", ar_op);
78 add_item_to_tree(arp_tree, offset + 8, 6,
79 "Sender ether: %s", ether_to_str((guint8 *) ea->arp_sha));
80 add_item_to_tree(arp_tree, offset + 14, 4,
81 "Sender IP: %s", ip_to_str((guint8 *) ea->arp_spa));
82 add_item_to_tree(arp_tree, offset + 18, 6,
83 "Target ether: %s", ether_to_str((guint8 *) ea->arp_tha));
84 add_item_to_tree(arp_tree, offset + 24, 4,
85 "Target IP: %s", ip_to_str((guint8 *) ea->arp_tpa));
88 if (ar_pro != ETHERTYPE_IP && fd->win_info[COL_NUM]) {
89 sprintf(fd->win_info[COL_INFO], "h/w %d (%d) prot %d (%d) op 0x%04x",
90 ar_hrd, ea->ar_hln, ar_pro, ea->ar_pln, ar_op);
95 if (fd->win_info[COL_NUM]) {
96 sprintf(fd->win_info[COL_INFO], "Who has %s? Tell %s",
97 ip_to_str((guint8 *) ea->arp_tpa), ip_to_str((guint8 *) ea->arp_spa));
101 if (fd->win_info[COL_NUM]) {
102 sprintf(fd->win_info[COL_INFO], "%s is at %s",
103 ip_to_str((guint8 *) ea->arp_spa),
104 ether_to_str((guint8 *) ea->arp_sha));
108 if (fd->win_info[COL_NUM]) {
109 strcpy(fd->win_info[COL_PROTOCOL], "RARP");
110 sprintf(fd->win_info[COL_INFO], "Who is %s? Tell %s",
111 ether_to_str((guint8 *) ea->arp_tha),
112 ether_to_str((guint8 *) ea->arp_sha));
116 if (fd->win_info[COL_NUM]) {
117 strcpy(fd->win_info[COL_PROTOCOL], "RARP");
118 sprintf(fd->win_info[COL_INFO], "%s is at %s",
119 ether_to_str((guint8 *) ea->arp_sha),
120 ip_to_str((guint8 *) ea->arp_spa));