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wireshark/packet-arp.c

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/* packet-arp.c
* Routines for ARP packet disassembly
*
* $Id: packet-arp.c,v 1.12 1999/03/23 03:14:35 gram 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
#ifdef HAVE_SYS_TYPES_H
# include <sys/types.h>
#endif
#include <glib.h>
#include "packet.h"
#include "etypes.h"
/* Definitions taken from Linux "linux/if_arp.h" header file, and from
http://www.isi.edu/in-notes/iana/assignments/arp-parameters
*/
/* ARP protocol HARDWARE identifiers. */
#define ARPHRD_NETROM 0 /* from KA9Q: NET/ROM pseudo */
#define ARPHRD_ETHER 1 /* Ethernet 10Mbps */
#define ARPHRD_EETHER 2 /* Experimental Ethernet */
#define ARPHRD_AX25 3 /* AX.25 Level 2 */
#define ARPHRD_PRONET 4 /* PROnet token ring */
#define ARPHRD_CHAOS 5 /* Chaosnet */
#define ARPHRD_IEEE802 6 /* IEEE 802.2 Ethernet/TR/TB */
#define ARPHRD_ARCNET 7 /* ARCnet */
#define ARPHRD_HYPERCH 8 /* Hyperchannel */
#define ARPHRD_LANSTAR 9 /* Lanstar */
#define ARPHRD_AUTONET 10 /* Autonet Short Address */
#define ARPHRD_LOCALTLK 11 /* Localtalk */
#define ARPHRD_LOCALNET 12 /* LocalNet (IBM PCNet/Sytek LocalNET) */
#define ARPHRD_ULTRALNK 13 /* Ultra link */
#define ARPHRD_SMDS 14 /* SMDS */
#define ARPHRD_DLCI 15 /* Frame Relay DLCI */
#define ARPHRD_ATM 16 /* ATM */
#define ARPHRD_HDLC 17 /* HDLC */
#define ARPHRD_FIBREC 18 /* Fibre Channel */
#define ARPHRD_ATM2225 19 /* ATM (RFC 2225) */
#define ARPHRD_SERIAL 20 /* Serial Line */
#define ARPHRD_ATM2 21 /* ATM */
#define ARPHRD_MS188220 22 /* MIL-STD-188-220 */
#define ARPHRD_METRICOM 23 /* Metricom STRIP */
#define ARPHRD_IEEE1394 24 /* IEEE 1394.1995 */
#define ARPHRD_MAPOS 25 /* MAPOS */
#define ARPHRD_TWINAX 26 /* Twinaxial */
#define ARPHRD_EUI_64 27 /* EUI-64 */
/* Max string length for displaying unknown type of ARP address. */
#define MAX_ADDR_STR_LEN 16
/* ARP / RARP structs and definitions */
#ifndef ARPOP_REQUEST
#define ARPOP_REQUEST 1 /* ARP request. */
#endif
#ifndef ARPOP_REPLY
#define ARPOP_REPLY 2 /* ARP reply. */
#endif
/* Some OSes have different names, or don't define these at all */
#ifndef ARPOP_RREQUEST
#define ARPOP_RREQUEST 3 /* RARP request. */
#endif
#ifndef ARPOP_RREPLY
#define ARPOP_RREPLY 4 /* RARP reply. */
#endif
static gchar *
arpaddr_to_str(guint8 *ad, int ad_len) {
static gchar str[3][MAX_ADDR_STR_LEN+3+1];
static gchar *cur;
gchar *p;
int len;
static const char hex[16] = { '0', '1', '2', '3', '4', '5', '6', '7',
'8', '9', 'A', 'B', 'C', 'D', 'E', 'F' };
if (cur == &str[0][0]) {
cur = &str[1][0];
} else if (cur == &str[1][0]) {
cur = &str[2][0];
} else {
cur = &str[0][0];
}
p = cur;
len = MAX_ADDR_STR_LEN;
while (ad_len > 0 && len > 0) {
*p++ = hex[(*ad) >> 4];
*p++ = hex[(*ad) & 0xF];
len -= 2;
ad++;
ad_len--;
}
if (ad_len != 0) {
/* Note that we're not showing the full address. */
*p++ = '.';
*p++ = '.';
*p++ = '.';
}
*p = '\0';
return cur;
}
gchar *
arphrdaddr_to_str(guint8 *ad, int ad_len, guint16 type) {
if ((type == ARPHRD_ETHER || type == ARPHRD_EETHER || type == ARPHRD_IEEE802)
&& ad_len == 6) {
/* Ethernet address (or Experimental 3Mb Ethernet, or IEEE 802.x
address, which are the same type of address). */
return ether_to_str(ad);
}
return arpaddr_to_str(ad, ad_len);
}
static gchar *
arpproaddr_to_str(guint8 *ad, int ad_len, guint16 type) {
if (type == ETHERTYPE_IP && ad_len == 4) {
/* IP address. */
return ip_to_str(ad);
}
return arpaddr_to_str(ad, ad_len);
}
gchar *
arphrdtype_to_str(guint16 hwtype, const char *fmt) {
static const value_string hrd_vals[] = {
{ARPHRD_NETROM, "NET/ROM pseudo" },
{ARPHRD_ETHER, "Ethernet" },
{ARPHRD_EETHER, "Experimental Ethernet"},
{ARPHRD_AX25, "AX.25" },
{ARPHRD_PRONET, "ProNET" },
{ARPHRD_CHAOS, "Chaos" },
{ARPHRD_IEEE802, "IEEE 802" },
{ARPHRD_ARCNET, "ARCNET" },
{ARPHRD_HYPERCH, "Hyperchannel" },
{ARPHRD_LANSTAR, "Lanstar" },
{ARPHRD_AUTONET, "Autonet Short Address"},
{ARPHRD_LOCALTLK, "Localtalk" },
{ARPHRD_LOCALNET, "LocalNet" },
{ARPHRD_ULTRALNK, "Ultra link" },
{ARPHRD_SMDS, "SMDS" },
{ARPHRD_DLCI, "Frame Relay DLCI" },
{ARPHRD_ATM, "ATM" },
{ARPHRD_HDLC, "HDLC" },
{ARPHRD_FIBREC, "Fibre Channel" },
{ARPHRD_ATM2225, "ATM (RFC 2225)" },
{ARPHRD_SERIAL, "Serial Line" },
{ARPHRD_ATM2, "ATM" },
{ARPHRD_MS188220, "MIL-STD-188-220" },
{ARPHRD_METRICOM, "Metricom STRIP" },
{ARPHRD_IEEE1394, "IEEE 1394.1995" },
{ARPHRD_MAPOS, "MAPOS" },
{ARPHRD_TWINAX, "Twinaxial" },
{ARPHRD_EUI_64, "EUI-64" },
{0, NULL } };
return val_to_str(hwtype, hrd_vals, fmt);
}
/* Offsets of fields within an ARP packet. */
#define AR_HRD 0
#define AR_PRO 2
#define AR_HLN 4
#define AR_PLN 5
#define AR_OP 6
void
dissect_arp(const u_char *pd, int offset, frame_data *fd, proto_tree *tree) {
guint16 ar_hrd;
guint16 ar_pro;
guint8 ar_hln;
guint8 ar_pln;
guint16 ar_op;
proto_tree *arp_tree;
proto_item *ti;
gchar *op_str;
int sha_offset, spa_offset, tha_offset, tpa_offset;
gchar *sha_str, *spa_str, *tha_str, *tpa_str;
static const value_string op_vals[] = {
{ARPOP_REQUEST, "ARP request" },
{ARPOP_REPLY, "ARP reply" },
{ARPOP_RREQUEST, "RARP request"},
{ARPOP_RREPLY, "RARP reply" },
{0, NULL } };
/* To do: Check for {cap len,pkt len} < struct len */
ar_hrd = pntohs(&pd[offset + AR_HRD]);
ar_pro = pntohs(&pd[offset + AR_PRO]);
ar_hln = (guint8) pd[offset + AR_HLN];
ar_pln = (guint8) pd[offset + AR_PLN];
ar_op = pntohs(&pd[offset + AR_OP]);
/* Extract the addresses. */
sha_offset = offset + 8;
sha_str = arphrdaddr_to_str((guint8 *) &pd[sha_offset], ar_hln, ar_hrd);
spa_offset = sha_offset + ar_hln;
spa_str = arpproaddr_to_str((guint8 *) &pd[spa_offset], ar_pln, ar_pro);
tha_offset = spa_offset + ar_pln;
tha_str = arphrdaddr_to_str((guint8 *) &pd[tha_offset], ar_hln, ar_hrd);
tpa_offset = tha_offset + ar_hln;
tpa_str = arpproaddr_to_str((guint8 *) &pd[tpa_offset], ar_pln, ar_pro);
if (check_col(fd, COL_PROTOCOL)) {
if ((op_str = match_strval(ar_op, op_vals)))
col_add_str(fd, COL_PROTOCOL, op_str);
else
col_add_str(fd, COL_PROTOCOL, "ARP");
}
if (check_col(fd, COL_INFO)) {
switch (ar_op) {
case ARPOP_REQUEST:
col_add_fstr(fd, COL_INFO, "Who has %s? Tell %s",
tpa_str, spa_str);
break;
case ARPOP_REPLY:
col_add_fstr(fd, COL_INFO, "%s is at %s", spa_str, sha_str);
break;
case ARPOP_RREQUEST:
col_add_fstr(fd, COL_INFO, "Who is %s? Tell %s",
tha_str, sha_str);
break;
case ARPOP_RREPLY:
col_add_fstr(fd, COL_INFO, "%s is at %s", sha_str, spa_str);
break;
default:
col_add_fstr(fd, COL_INFO, "Unknown ARP opcode 0x%04x", ar_op);
break;
}
}
if (tree) {
if ((op_str = match_strval(ar_op, op_vals)))
ti = proto_tree_add_item(tree, offset, 8 + 2*ar_hln + 2*ar_pln,
op_str);
else
ti = proto_tree_add_item(tree, offset, 8 + 2*ar_hln + 2*ar_pln,
"Unknown ARP (opcode 0x%04x)", ar_op);
arp_tree = proto_tree_new();
proto_item_add_subtree(ti, arp_tree, ETT_ARP);
proto_tree_add_item(arp_tree, offset + AR_HRD, 2,
"Hardware type: %s", arphrdtype_to_str(ar_hrd, "Unknown (0x%04x)"));
proto_tree_add_item(arp_tree, offset + AR_PRO, 2,
"Protocol type: %s", ethertype_to_str(ar_pro, "Unknown (0x%04x)"));
proto_tree_add_item(arp_tree, offset + AR_HLN, 1,
"Hardware size: %d", ar_hln);
proto_tree_add_item(arp_tree, offset + AR_PLN, 1,
"Protocol size: %d", ar_pln);
proto_tree_add_item(arp_tree, offset + AR_OP, 2,
"Opcode: 0x%04x (%s)", ar_op, op_str ? op_str : "Unknown");
proto_tree_add_item(arp_tree, sha_offset, ar_hln,
"Sender hardware address: %s", sha_str);
proto_tree_add_item(arp_tree, spa_offset, ar_pln,
"Sender protocol address: %s", spa_str);
proto_tree_add_item(arp_tree, tha_offset, ar_hln,
"Target hardware address: %s", tha_str);
proto_tree_add_item(arp_tree, tpa_offset, ar_pln,
"Target protocol address: %s", tpa_str);
}
}
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