osmith
/
wireshark
forked from osmocom/wireshark
1
0
Fork 0
Code Pull Requests Releases Wiki Activity
wireshark/packet-aarp.c

363 lines
10 KiB
C
Raw Blame History

/* packet-aarp.c
* Routines for Appletalk ARP packet disassembly
*
* $Id: packet-aarp.c,v 1.37 2002/08/28 21:00:06 jmayer Exp $
*
* Simon Wilkinson <sxw@dcs.ed.ac.uk>
*
* Ethereal - Network traffic analyzer
* By Gerald Combs <gerald@ethereal.com>
* Copyright 1998
*
* 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 <stdio.h>
#include <glib.h>
#include <epan/packet.h>
#include <epan/strutil.h>
#include "etypes.h"
static int proto_aarp = -1;
static int hf_aarp_hard_type = -1;
static int hf_aarp_proto_type = -1;
static int hf_aarp_hard_size = -1;
static int hf_aarp_proto_size = -1;
static int hf_aarp_opcode = -1;
static int hf_aarp_src_hw = -1;
static int hf_aarp_src_hw_mac = -1;
static int hf_aarp_src_proto = -1;
static int hf_aarp_src_proto_id = -1;
static int hf_aarp_dst_hw = -1;
static int hf_aarp_dst_hw_mac = -1;
static int hf_aarp_dst_proto = -1;
static int hf_aarp_dst_proto_id = -1;
static gint ett_aarp = -1;
#ifndef AARP_REQUEST
#define AARP_REQUEST 0x0001
#endif
#ifndef AARP_REPLY
#define AARP_REPLY 0x0002
#endif
#ifndef AARP_PROBE
#define AARP_PROBE 0x0003
#endif
/* The following is screwed up shit to deal with the fact that
the linux kernel edits the packet inline. */
#define AARP_REQUEST_SWAPPED 0x0100
#define AARP_REPLY_SWAPPED 0x0200
#define AARP_PROBE_SWAPPED 0x0300
static const value_string op_vals[] = {
{AARP_REQUEST, "request" },
{AARP_REPLY, "reply" },
{AARP_PROBE, "probe" },
{AARP_REQUEST_SWAPPED, "request" },
{AARP_REPLY_SWAPPED, "reply" },
{AARP_PROBE_SWAPPED, "probe" },
{0, NULL } };
/* AARP protocol HARDWARE identifiers. */
#define AARPHRD_ETHER 1 /* Ethernet 10Mbps */
#define AARPHRD_TR 2 /* Token Ring */
static const value_string hrd_vals[] = {
{AARPHRD_ETHER, "Ethernet" },
{AARPHRD_TR, "Token Ring" },
{0, NULL } };
/*
* Given the hardware address type and length, check whether an address
* is an Ethernet address - the address must be of type "Ethernet" or
* "Token Ring", and the length must be 6 bytes.
*/
#define AARP_HW_IS_ETHER(ar_hrd, ar_hln) \
(((ar_hrd) == AARPHRD_ETHER || (ar_hrd) == AARPHRD_TR) \
&& (ar_hln) == 6)
/*
* Given the protocol address type and length, check whether an address
* is an Appletalk address - the address must be of type "Appletalk",
* and the length must be 4 bytes.
*/
#define AARP_PRO_IS_ATALK(ar_pro, ar_pln) \
((ar_pro) == ETHERTYPE_ATALK && (ar_pln) == 4)
static gchar *
atalkid_to_str(const guint8 *ad) {
gint node;
static gchar str[3][16];
static gchar *cur;
if (cur == &str[0][0]) {
cur = &str[1][0];
} else if (cur == &str[1][0]) {
cur = &str[2][0];
} else {
cur = &str[0][0];
}
node=ad[1]<<8|ad[2];
sprintf(cur, "%d.%d",node,ad[3]);
return cur;
}
static gchar *
aarphrdaddr_to_str(const guint8 *ad, int ad_len, guint16 type) {
if (AARP_HW_IS_ETHER(type, ad_len)) {
/* Ethernet address (or Token Ring address, which is the same type
of address). */
return ether_to_str(ad);
}
return bytes_to_str(ad, ad_len);
}
static gchar *
aarpproaddr_to_str(const guint8 *ad, int ad_len, guint16 type) {
if (AARP_PRO_IS_ATALK(type, ad_len)) {
/* Appletalk address. */
return atalkid_to_str(ad);
}
return bytes_to_str(ad, ad_len);
}
/* Offsets of fields within an AARP packet. */
#define AR_HRD 0
#define AR_PRO 2
#define AR_HLN 4
#define AR_PLN 5
#define AR_OP 6
#define MIN_AARP_HEADER_SIZE 8
static void
dissect_aarp(tvbuff_t *tvb, packet_info *pinfo, proto_tree *tree) {
guint16 ar_hrd;
guint16 ar_pro;
guint8 ar_hln;
guint8 ar_pln;
guint16 ar_op;
proto_tree *aarp_tree;
proto_item *ti;
gchar *op_str;
int sha_offset, spa_offset, tha_offset, tpa_offset;
const guint8 *sha_val, *spa_val, *tha_val, *tpa_val;
gchar *sha_str, *spa_str, *tha_str, *tpa_str;
if(check_col(pinfo->cinfo, COL_PROTOCOL))
col_set_str(pinfo->cinfo, COL_PROTOCOL, "AARP");
if(check_col(pinfo->cinfo, COL_INFO))
col_clear(pinfo->cinfo, COL_INFO);
ar_hrd = tvb_get_ntohs(tvb, AR_HRD);
ar_pro = tvb_get_ntohs(tvb, AR_PRO);
ar_hln = tvb_get_guint8(tvb, AR_HLN);
ar_pln = tvb_get_guint8(tvb, AR_PLN);
ar_op = tvb_get_ntohs(tvb, AR_OP);
/* Get the offsets of the addresses. */
sha_offset = MIN_AARP_HEADER_SIZE;
spa_offset = sha_offset + ar_hln;
tha_offset = spa_offset + ar_pln;
tpa_offset = tha_offset + ar_hln;
/* Extract the addresses. */
sha_val = tvb_get_ptr(tvb, sha_offset, ar_hln);
sha_str = aarphrdaddr_to_str(sha_val, ar_hln, ar_hrd);
spa_val = tvb_get_ptr(tvb, spa_offset, ar_pln);
spa_str = aarpproaddr_to_str(spa_val, ar_pln, ar_pro);
tha_val = tvb_get_ptr(tvb, tha_offset, ar_hln);
tha_str = aarphrdaddr_to_str(tha_val, ar_hln, ar_hrd);
tpa_val = tvb_get_ptr(tvb, tpa_offset, ar_pln);
tpa_str = aarpproaddr_to_str(tpa_val, ar_pln, ar_pro);
if (check_col(pinfo->cinfo, COL_INFO)) {
switch (ar_op) {
case AARP_REQUEST:
case AARP_REQUEST_SWAPPED:
col_add_fstr(pinfo->cinfo, COL_INFO, "Who has %s? Tell %s", tpa_str, spa_str);
break;
case AARP_REPLY:
case AARP_REPLY_SWAPPED:
col_add_fstr(pinfo->cinfo, COL_INFO, "%s is at %s", spa_str, sha_str);
break;
case AARP_PROBE:
case AARP_PROBE_SWAPPED:
col_add_fstr(pinfo->cinfo, COL_INFO, "Is there a %s", tpa_str);
break;
default:
col_add_fstr(pinfo->cinfo, COL_INFO, "Unknown AARP opcode 0x%04x", ar_op);
break;
}
}
if (tree) {
if ((op_str = match_strval(ar_op, op_vals)))
ti = proto_tree_add_protocol_format(tree, proto_aarp, tvb, 0,
MIN_AARP_HEADER_SIZE + 2*ar_hln +
2*ar_pln, "AppleTalk Address Resolution Protocol (%s)", op_str);
else
ti = proto_tree_add_protocol_format(tree, proto_aarp, tvb, 0,
MIN_AARP_HEADER_SIZE + 2*ar_hln +
2*ar_pln,
"AppleTalk Address Resolution Protocol (opcode 0x%04x)", ar_op);
aarp_tree = proto_item_add_subtree(ti, ett_aarp);
proto_tree_add_uint(aarp_tree, hf_aarp_hard_type, tvb, AR_HRD, 2,
ar_hrd);
proto_tree_add_uint(aarp_tree, hf_aarp_proto_type, tvb, AR_PRO, 2,
ar_pro);
proto_tree_add_uint(aarp_tree, hf_aarp_hard_size, tvb, AR_HLN, 1,
ar_hln);
proto_tree_add_uint(aarp_tree, hf_aarp_proto_size, tvb, AR_PLN, 1,
ar_pln);
proto_tree_add_uint(aarp_tree, hf_aarp_opcode, tvb, AR_OP, 2,
ar_op);
if (ar_hln != 0) {
proto_tree_add_item(aarp_tree,
AARP_HW_IS_ETHER(ar_hrd, ar_hln) ? hf_aarp_src_hw_mac : hf_aarp_src_hw,
tvb, sha_offset, ar_hln, FALSE);
}
if (ar_pln != 0) {
if (AARP_PRO_IS_ATALK(ar_pro, ar_pln)) {
proto_tree_add_bytes_format(aarp_tree, hf_aarp_src_proto_id, tvb, spa_offset, ar_pln,
spa_val,
"Sender ID: %s", spa_str);
} else {
proto_tree_add_bytes_format(aarp_tree, hf_aarp_src_proto, tvb, spa_offset, ar_pln,
spa_val,
"Sender protocol address: %s", spa_str);
}
}
if (ar_hln != 0) {
proto_tree_add_item(aarp_tree,
AARP_HW_IS_ETHER(ar_hrd, ar_hln) ? hf_aarp_dst_hw_mac : hf_aarp_dst_hw,
tvb, tha_offset, ar_hln, FALSE);
}
if (ar_pln != 0) {
if (AARP_PRO_IS_ATALK(ar_pro, ar_pln)) {
proto_tree_add_bytes_format(aarp_tree, hf_aarp_dst_proto_id, tvb, tpa_offset, ar_pln,
tpa_val,
"Target ID: %s", tpa_str);
} else {
proto_tree_add_bytes_format(aarp_tree, hf_aarp_dst_proto, tvb, tpa_offset, ar_pln,
tpa_val,
"Target protocol address: %s", tpa_str);
}
}
}
}
void
proto_register_aarp(void)
{
static hf_register_info hf[] = {
{ &hf_aarp_hard_type,
{ "Hardware type", "aarp.hard.type",
FT_UINT16, BASE_HEX, VALS(hrd_vals), 0x0,
"", HFILL }},
{ &hf_aarp_proto_type,
{ "Protocol type", "aarp.proto.type",
FT_UINT16, BASE_HEX, VALS(etype_vals), 0x0,
"", HFILL }},
{ &hf_aarp_hard_size,
{ "Hardware size", "aarp.hard.size",
FT_UINT8, BASE_DEC, NULL, 0x0,
"", HFILL }},
{ &hf_aarp_proto_size,
{ "Protocol size", "aarp.proto.size",
FT_UINT8, BASE_DEC, NULL, 0x0,
"", HFILL }},
{ &hf_aarp_opcode,
{ "Opcode", "aarp.opcode",
FT_UINT16, BASE_DEC, VALS(op_vals), 0x0,
"", HFILL }},
{ &hf_aarp_src_hw,
{ "Sender hardware address", "aarp.src.hw",
FT_BYTES, BASE_NONE, NULL, 0x0,
"", HFILL }},
{ &hf_aarp_src_hw_mac,
{ "Sender MAC address", "aarp.src.hw_mac",
FT_ETHER, BASE_NONE, NULL, 0x0,
"", HFILL }},
{ &hf_aarp_src_proto,
{ "Sender protocol address", "aarp.src.proto",
FT_BYTES, BASE_NONE, NULL, 0x0,
"", HFILL }},
{ &hf_aarp_src_proto_id,
{ "Sender ID", "aarp.src.proto_id",
FT_BYTES, BASE_HEX, NULL, 0x0,
"", HFILL }},
{ &hf_aarp_dst_hw,
{ "Target hardware address", "aarp.dst.hw",
FT_BYTES, BASE_NONE, NULL, 0x0,
"", HFILL }},
{ &hf_aarp_dst_hw_mac,
{ "Target MAC address", "aarp.dst.hw_mac",
FT_ETHER, BASE_NONE, NULL, 0x0,
"", HFILL }},
{ &hf_aarp_dst_proto,
{ "Target protocol address", "aarp.dst.proto",
FT_BYTES, BASE_NONE, NULL, 0x0,
"", HFILL }},
{ &hf_aarp_dst_proto_id,
{ "Target ID", "aarp.dst.proto_id",
FT_BYTES, BASE_HEX, NULL, 0x0,
"", HFILL }},
};
static gint *ett[] = {
&ett_aarp,
};
proto_aarp = proto_register_protocol("Appletalk Address Resolution Protocol",
"AARP",
"aarp");
proto_register_field_array(proto_aarp, hf, array_length(hf));
proto_register_subtree_array(ett, array_length(ett));
}
void
proto_reg_handoff_aarp(void)
{
dissector_handle_t aarp_handle;
aarp_handle = create_dissector_handle(dissect_aarp, proto_aarp);
dissector_add("ethertype", ETHERTYPE_AARP, aarp_handle);
dissector_add("chdlctype", ETHERTYPE_AARP, aarp_handle);
}
View Git Blame Copy Permalink