2 * Routines for ARP packet disassembly
4 * $Id: packet-arp.c,v 1.4 1998/10/10 03:32:10 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 GtkWidget *arp_tree, *ti;
53 value_string op_vals[] = { ARPOP_REQUEST, "ARP request",
54 ARPOP_REPLY, "ARP reply",
55 ARPOP_RREQUEST, "RARP request",
56 ARPOP_RREPLY, "RARP reply" };
58 /* To do: Check for {cap len,pkt len} < struct len */
59 ea = (e_ether_arp *) &pd[offset];
60 ar_hrd = ntohs(ea->ar_hrd);
61 ar_pro = ntohs(ea->ar_pro);
62 /* To do: Check for bounds on ar_op */
63 ar_op = ntohs(ea->ar_op);
65 if (fd->win_info[COL_NUM]) { strcpy(fd->win_info[COL_PROTOCOL], "ARP"); }
68 if (op_str = match_strval(ar_op, op_vals, 4))
69 ti = add_item_to_tree(GTK_WIDGET(tree), offset, 28, op_str);
71 ti = add_item_to_tree(GTK_WIDGET(tree), offset, 28,
72 "Unkown ARP (opcode 0x%04x)", ar_op);
73 arp_tree = gtk_tree_new();
74 add_subtree(ti, arp_tree, ETT_ARP);
75 add_item_to_tree(arp_tree, offset, 2,
76 "Hardware type: 0x%04x", ar_hrd);
77 add_item_to_tree(arp_tree, offset + 2, 2,
78 "Protocol type: 0x%04x", ar_pro);
79 add_item_to_tree(arp_tree, offset + 4, 1,
80 "Hardware size: 0x%02x", ea->ar_hln);
81 add_item_to_tree(arp_tree, offset + 5, 1,
82 "Protocol size: 0x%02x", ea->ar_pln);
83 add_item_to_tree(arp_tree, offset + 6, 2,
84 "Opcode: 0x%04x (%s)", ar_op, op_str ? op_str : "Unknown");
85 add_item_to_tree(arp_tree, offset + 8, 6,
86 "Sender ether: %s", ether_to_str((guint8 *) ea->arp_sha));
87 add_item_to_tree(arp_tree, offset + 14, 4,
88 "Sender IP: %s", ip_to_str((guint8 *) ea->arp_spa));
89 add_item_to_tree(arp_tree, offset + 18, 6,
90 "Target ether: %s", ether_to_str((guint8 *) ea->arp_tha));
91 add_item_to_tree(arp_tree, offset + 24, 4,
92 "Target IP: %s", ip_to_str((guint8 *) ea->arp_tpa));
95 if (ar_pro != ETHERTYPE_IP && fd->win_info[COL_NUM]) {
96 sprintf(fd->win_info[COL_INFO], "h/w %d (%d) prot %d (%d) op 0x%04x",
97 ar_hrd, ea->ar_hln, ar_pro, ea->ar_pln, ar_op);
102 if (fd->win_info[COL_NUM]) {
103 sprintf(fd->win_info[COL_INFO], "Who has %s? Tell %s",
104 ip_to_str((guint8 *) ea->arp_tpa), ip_to_str((guint8 *) ea->arp_spa));
108 if (fd->win_info[COL_NUM]) {
109 sprintf(fd->win_info[COL_INFO], "%s is at %s",
110 ip_to_str((guint8 *) ea->arp_spa),
111 ether_to_str((guint8 *) ea->arp_sha));
115 if (fd->win_info[COL_NUM]) {
116 strcpy(fd->win_info[COL_PROTOCOL], "RARP");
117 sprintf(fd->win_info[COL_INFO], "Who is %s? Tell %s",
118 ether_to_str((guint8 *) ea->arp_tha),
119 ether_to_str((guint8 *) ea->arp_sha));
123 if (fd->win_info[COL_NUM]) {
124 strcpy(fd->win_info[COL_PROTOCOL], "RARP");
125 sprintf(fd->win_info[COL_INFO], "%s is at %s",
126 ether_to_str((guint8 *) ea->arp_sha),
127 ip_to_str((guint8 *) ea->arp_spa));