1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
|
/* packet-arp.c
* Routines for ARP packet disassembly
*
* $Id: packet-arp.c,v 1.4 1998/10/10 03:32:10 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 <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;
GtkWidget *arp_tree, *ti;
gchar *op_str;
value_string op_vals[] = { ARPOP_REQUEST, "ARP request",
ARPOP_REPLY, "ARP reply",
ARPOP_RREQUEST, "RARP request",
ARPOP_RREPLY, "RARP reply" };
/* 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[COL_NUM]) { strcpy(fd->win_info[COL_PROTOCOL], "ARP"); }
if (tree) {
if (op_str = match_strval(ar_op, op_vals, 4))
ti = add_item_to_tree(GTK_WIDGET(tree), offset, 28, op_str);
else
ti = add_item_to_tree(GTK_WIDGET(tree), offset, 28,
"Unkown ARP (opcode 0x%04x)", ar_op);
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 (%s)", ar_op, op_str ? op_str : "Unknown");
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[COL_NUM]) {
sprintf(fd->win_info[COL_INFO], "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[COL_NUM]) {
sprintf(fd->win_info[COL_INFO], "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[COL_NUM]) {
sprintf(fd->win_info[COL_INFO], "%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[COL_NUM]) {
strcpy(fd->win_info[COL_PROTOCOL], "RARP");
sprintf(fd->win_info[COL_INFO], "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[COL_NUM]) {
strcpy(fd->win_info[COL_PROTOCOL], "RARP");
sprintf(fd->win_info[COL_INFO], "%s is at %s",
ether_to_str((guint8 *) ea->arp_sha),
ip_to_str((guint8 *) ea->arp_spa));
}
break;
}
}
|
