![Guy Harris](/assets/img/avatar_default.png)
dynamically-assigned "ett_" integer values, assigned by "proto_register_subtree_array()"; this: obviates the need to update "packet.h" whenever you add a new subtree type - you only have to add a call to "proto_register_subtree_array()" to a "register" routine and an array of pointers to "ett_", if they're not already there, and add a pointer to the new "ett_" variable to the array, if they are there; would allow run-time-loaded dissectors to allocate subtree types when they're loaded. svn path=/trunk/; revision=1043
342 lines
11 KiB
C
342 lines
11 KiB
C
/* packet-arp.c
|
|
* Routines for ARP packet disassembly
|
|
*
|
|
* $Id: packet-arp.c,v 1.22 1999/11/16 11:42:24 guy 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"
|
|
|
|
static int proto_arp = -1;
|
|
static int hf_arp_hard_type = -1;
|
|
static int hf_arp_proto_type = -1;
|
|
static int hf_arp_hard_size = -1;
|
|
static int hf_arp_proto_size = -1;
|
|
static int hf_arp_opcode = -1;
|
|
static int hf_arp_src_ether = -1;
|
|
static int hf_arp_src_proto = -1;
|
|
static int hf_arp_dst_ether = -1;
|
|
static int hf_arp_dst_proto = -1;
|
|
|
|
static gint ett_arp = -1;
|
|
|
|
/* 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 */
|
|
|
|
/* 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 const value_string op_vals[] = {
|
|
{ARPOP_REQUEST, "ARP request" },
|
|
{ARPOP_REPLY, "ARP reply" },
|
|
{ARPOP_RREQUEST, "RARP request"},
|
|
{ARPOP_RREPLY, "RARP reply" },
|
|
{0, NULL } };
|
|
|
|
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 bytes_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 bytes_to_str(ad, ad_len);
|
|
}
|
|
|
|
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 } };
|
|
|
|
gchar *
|
|
arphrdtype_to_str(guint16 hwtype, const char *fmt) {
|
|
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
|
|
#define MIN_ARP_HEADER_SIZE 8
|
|
|
|
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;
|
|
|
|
if (!BYTES_ARE_IN_FRAME(offset, MIN_ARP_HEADER_SIZE)) {
|
|
dissect_data(pd, offset, fd, tree);
|
|
return;
|
|
}
|
|
|
|
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]);
|
|
|
|
if (!BYTES_ARE_IN_FRAME(offset,
|
|
MIN_ARP_HEADER_SIZE + ar_hln*2 + ar_pln*2)) {
|
|
dissect_data(pd, offset, fd, tree);
|
|
return;
|
|
}
|
|
|
|
/* Extract the addresses. */
|
|
sha_offset = offset + MIN_ARP_HEADER_SIZE;
|
|
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)) {
|
|
switch (ar_op) {
|
|
|
|
case ARPOP_REQUEST:
|
|
case ARPOP_REPLY:
|
|
default:
|
|
col_add_str(fd, COL_PROTOCOL, "ARP");
|
|
break;
|
|
|
|
case ARPOP_RREQUEST:
|
|
case ARPOP_RREPLY:
|
|
col_add_str(fd, COL_PROTOCOL, "RARP");
|
|
break;
|
|
}
|
|
}
|
|
|
|
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_format(tree, proto_arp, offset,
|
|
MIN_ARP_HEADER_SIZE + 2*ar_hln +
|
|
2*ar_pln, NULL, op_str);
|
|
else
|
|
ti = proto_tree_add_item_format(tree, proto_arp, offset,
|
|
MIN_ARP_HEADER_SIZE + 2*ar_hln +
|
|
2*ar_pln, NULL,
|
|
"Unknown ARP (opcode 0x%04x)", ar_op);
|
|
arp_tree = proto_item_add_subtree(ti, ett_arp);
|
|
proto_tree_add_item(arp_tree, hf_arp_hard_type, offset + AR_HRD, 2,
|
|
ar_hrd);
|
|
proto_tree_add_item(arp_tree, hf_arp_proto_type, offset + AR_PRO, 2,
|
|
ar_pro);
|
|
proto_tree_add_item(arp_tree, hf_arp_hard_size, offset + AR_HLN, 1,
|
|
ar_hln);
|
|
proto_tree_add_item(arp_tree, hf_arp_proto_size, offset + AR_PLN, 1,
|
|
ar_pln);
|
|
proto_tree_add_item(arp_tree, hf_arp_opcode, offset + AR_OP, 2,
|
|
ar_op);
|
|
proto_tree_add_item_format(arp_tree, hf_arp_src_ether, sha_offset, ar_hln,
|
|
&pd[sha_offset],
|
|
"Sender hardware address: %s", sha_str);
|
|
proto_tree_add_item_format(arp_tree, hf_arp_src_proto, spa_offset, ar_pln,
|
|
&pd[spa_offset],
|
|
"Sender protocol address: %s", spa_str);
|
|
proto_tree_add_item_format(arp_tree, hf_arp_dst_ether, tha_offset, ar_hln,
|
|
&pd[tha_offset],
|
|
"Target hardware address: %s", tha_str);
|
|
proto_tree_add_item_format(arp_tree, hf_arp_dst_proto, tpa_offset, ar_pln,
|
|
&pd[tpa_offset],
|
|
"Target protocol address: %s", tpa_str);
|
|
}
|
|
}
|
|
|
|
void
|
|
proto_register_arp(void)
|
|
{
|
|
static hf_register_info hf[] = {
|
|
{ &hf_arp_hard_type,
|
|
{ "Hardware type", "arp.hw.type",
|
|
FT_UINT16, BASE_HEX, VALS(hrd_vals), 0x0,
|
|
"" }},
|
|
|
|
{ &hf_arp_proto_type,
|
|
{ "Protocol type", "arp.proto.type",
|
|
FT_UINT16, BASE_HEX, VALS(etype_vals), 0x0,
|
|
"" }},
|
|
|
|
{ &hf_arp_hard_size,
|
|
{ "Hardware size", "arp.hw.size",
|
|
FT_UINT8, BASE_DEC, NULL, 0x0,
|
|
"" }},
|
|
|
|
{ &hf_arp_proto_size,
|
|
{ "Protocol size", "arp.proto.size",
|
|
FT_UINT8, BASE_DEC, NULL, 0x0,
|
|
"" }},
|
|
|
|
{ &hf_arp_opcode,
|
|
{ "Opcode", "arp.opcode",
|
|
FT_UINT16, BASE_HEX, VALS(op_vals), 0x0,
|
|
"" }},
|
|
|
|
{ &hf_arp_src_ether,
|
|
{ "Sender hardware address", "arp.src.hw",
|
|
FT_BYTES, BASE_NONE, NULL, 0x0,
|
|
"" }},
|
|
|
|
{ &hf_arp_src_proto,
|
|
{ "Sender protocol address", "arp.src.proto",
|
|
FT_BYTES, BASE_NONE, NULL, 0x0,
|
|
"" }},
|
|
|
|
{ &hf_arp_dst_ether,
|
|
{ "Target hardware address", "arp.dst.hw",
|
|
FT_BYTES, BASE_NONE, NULL, 0x0,
|
|
"" }},
|
|
|
|
{ &hf_arp_dst_proto,
|
|
{ "Target protocol address", "arp.dst.proto",
|
|
FT_BYTES, BASE_NONE, NULL, 0x0,
|
|
"" }}
|
|
};
|
|
static gint *ett[] = {
|
|
&ett_arp,
|
|
};
|
|
|
|
proto_arp = proto_register_protocol("Address Resolution Protocol", "arp");
|
|
proto_register_field_array(proto_arp, hf, array_length(hf));
|
|
proto_register_subtree_array(ett, array_length(ett));
|
|
}
|