299 lines
8.0 KiB
C
299 lines
8.0 KiB
C
/* packet-cisco-wireless.c
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* Routines for the disassembly of some (unknown) L2 packets
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* sent by Ciscos Access Points (Aironet)
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*
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* Copyright 2005 Joerg Mayer (see AUTHORS file)
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*
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* $Id$
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*
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* Ethereal - Network traffic analyzer
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* By Gerald Combs <gerald@ethereal.com>
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* Copyright 1998 Gerald Combs
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License
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* as published by the Free Software Foundation; either version 2
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* of the License, or (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
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*/
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/*
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* I couldn't find any documentation on this protocol. Neither
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* what it's good for nor what the elements do. This is purely
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* reverse engineered by looking at the hex dump of the packets.
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*
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* Sample capture in wiki (ciscowl.pcap.gz)
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*
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* TODO
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* - Find out more about unknown fields
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* - Currently only one type of packet is really handled at all
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*
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* Packets are sent in two possible encapsulations:
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* Ethernet V2 with type 0x872d or SNAP with OUI 0x004096
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*
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* Header (Eth V2 or SNAP)
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* Length (2 bytes)
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* Type (2 bytes)
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* 0202: Unknown, Length 36 (14 + 20 + 2)
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* 4001: Unknown, Length 48 (14 + 32 + 2)
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* 4601: Unknown, Length 34 (14 + 18 + 2)
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* 4081 on Eth V2: Name, Version Length 84 (14 + 48 + 20 + 2)
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* 4081 on 802.3: Name Length 72 (14 + 56 + 2)
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* Dst MAC (6 bytes)
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* Src MAC (6 bytes)
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* Unknown1 (2 bytes) Unknown19 + Unknown2 may be a MAC address on type 0202
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* Unknown2 (4 bytes) see Unknown19
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* 0 (17 bytes)
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* Device IP (4 bytes)
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* 0 (2 bytes)
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* Device name (8 bytes)
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* 0 (20 bytes)
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* Unknown3 (2 bytes)
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* Unknown4 (4 bytes)
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* Version string (10 bytes)
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* 0 (4 bytes)
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* 0 (2 bytes)
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*/
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#ifdef HAVE_CONFIG_H
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# include "config.h"
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#endif
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#include <string.h>
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#include <glib.h>
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#include <epan/packet.h>
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#include <epan/strutil.h>
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#include "packet-llc.h"
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#include <epan/oui.h>
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#include <epan/etypes.h>
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static int hf_llc_ciscowl_pid = -1;
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static int proto_ciscowl = -1;
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static int hf_ciscowl_length = -1;
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static int hf_ciscowl_type = -1;
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static int hf_ciscowl_srcmac = -1;
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static int hf_ciscowl_dstmac = -1;
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static int hf_ciscowl_somemac = -1;
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static int hf_ciscowl_unknown1 = -1;
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static int hf_ciscowl_unknown2 = -1;
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static int hf_ciscowl_null1 = -1;
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static int hf_ciscowl_ip = -1;
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static int hf_ciscowl_null2 = -1;
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static int hf_ciscowl_name = -1;
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static int hf_ciscowl_unknown3 = -1;
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static int hf_ciscowl_unknown4 = -1;
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static int hf_ciscowl_version = -1;
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static int hf_ciscowl_rest = -1;
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static gint ett_ciscowl = -1;
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#define PROTO_SHORT_NAME "CISCOWL-L2"
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#define PROTO_LONG_NAME "Cisco Wireless Layer 2"
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static const value_string cisco_pid_vals[] = {
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{ 0x0000, "CiscoWL" },
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{ 0, NULL }
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};
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static void
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dissect_ciscowl(tvbuff_t *tvb, packet_info *pinfo, proto_tree *tree)
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{
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proto_item *ti;
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proto_tree *ciscowl_tree = NULL;
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guint32 offset = 0;
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guint32 length, type;
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if (check_col(pinfo->cinfo, COL_PROTOCOL))
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col_set_str(pinfo->cinfo, COL_PROTOCOL, PROTO_SHORT_NAME);
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if (check_col(pinfo->cinfo, COL_INFO))
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col_set_str(pinfo->cinfo, COL_INFO, PROTO_SHORT_NAME);
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if (tree) {
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ti = proto_tree_add_item(tree, proto_ciscowl, tvb, offset, -1,
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FALSE);
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ciscowl_tree = proto_item_add_subtree(ti, ett_ciscowl);
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length = tvb_get_ntohs(tvb, offset);
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proto_tree_add_item(ciscowl_tree, hf_ciscowl_length, tvb, offset, 2,
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FALSE);
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offset += 2;
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type = tvb_get_ntohs(tvb, offset);
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proto_tree_add_item(ciscowl_tree, hf_ciscowl_type, tvb, offset, 2,
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FALSE);
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offset += 2;
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proto_tree_add_item(ciscowl_tree, hf_ciscowl_dstmac, tvb, offset, 6,
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FALSE);
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offset += 6;
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proto_tree_add_item(ciscowl_tree, hf_ciscowl_srcmac, tvb, offset, 6,
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FALSE);
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offset += 6;
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if (type == 0x0202) {
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proto_tree_add_item(ciscowl_tree, hf_ciscowl_somemac, tvb,
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offset, 6, FALSE);
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offset += 6;
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} else {
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proto_tree_add_item(ciscowl_tree, hf_ciscowl_unknown1, tvb,
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offset, 2, FALSE);
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offset += 2;
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proto_tree_add_item(ciscowl_tree, hf_ciscowl_unknown2, tvb,
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offset, 4, FALSE);
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offset += 4;
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}
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if (type == 0x4081) {
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proto_tree_add_item(ciscowl_tree, hf_ciscowl_null1, tvb,
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offset, 16, FALSE);
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offset += 16;
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proto_tree_add_item(ciscowl_tree, hf_ciscowl_ip, tvb,
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offset, 4, FALSE);
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offset += 4;
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proto_tree_add_item(ciscowl_tree, hf_ciscowl_null2, tvb,
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offset, 2, FALSE);
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offset += 2;
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proto_tree_add_item(ciscowl_tree, hf_ciscowl_name, tvb,
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offset, 28, FALSE);
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offset += 28;
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proto_tree_add_item(ciscowl_tree, hf_ciscowl_unknown3, tvb,
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offset, 2, FALSE);
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offset += 2;
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/* Frames in IEEE 802.3 format don't have a version field? */
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if (length > offset) {
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proto_tree_add_item(ciscowl_tree, hf_ciscowl_unknown4, tvb,
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offset, 4, FALSE);
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offset += 4;
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proto_tree_add_item(ciscowl_tree, hf_ciscowl_version, tvb,
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offset, 14, FALSE);
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offset += 14;
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}
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proto_tree_add_item(ciscowl_tree, hf_ciscowl_rest, tvb,
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offset, length - offset, FALSE);
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offset = length;
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} else {
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proto_tree_add_item(ciscowl_tree, hf_ciscowl_rest, tvb,
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offset, length - offset, FALSE);
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offset = length;
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}
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}
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}
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void
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proto_register_ciscowl(void)
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{
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static hf_register_info hf[] = {
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{ &hf_ciscowl_length,
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{ "Length", "ciscowl.length", FT_UINT16, BASE_DEC, NULL,
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0x0, "", HFILL }},
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{ &hf_ciscowl_type,
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{ "Type", "ciscowl.type", FT_UINT16, BASE_HEX, NULL,
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0x0, "Type(?)", HFILL }},
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{ &hf_ciscowl_srcmac,
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{ "Src MAC", "ciscowl.srcmac", FT_ETHER, BASE_NONE, NULL,
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0x0, "Source MAC", HFILL }},
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{ &hf_ciscowl_dstmac,
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{ "Dst MAC", "ciscowl.dstmac", FT_ETHER, BASE_NONE, NULL,
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0x0, "Destination MAC", HFILL }},
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{ &hf_ciscowl_somemac,
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{ "Some MAC", "ciscowl.somemac", FT_ETHER, BASE_NONE, NULL,
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0x0, "Some unknown MAC", HFILL }},
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{ &hf_ciscowl_unknown1,
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{ "Unknown1", "ciscowl.unknown1", FT_BYTES, BASE_HEX, NULL,
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0x0, "", HFILL }},
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{ &hf_ciscowl_unknown2,
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{ "Unknown2", "ciscowl.unknown2", FT_BYTES, BASE_HEX, NULL,
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0x0, "", HFILL }},
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{ &hf_ciscowl_null1,
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{ "Null1", "ciscowl.null1", FT_BYTES, BASE_HEX, NULL,
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0x0, "", HFILL }},
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{ &hf_ciscowl_ip,
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{ "IP", "ciscowl.ip", FT_IPv4, BASE_NONE, NULL,
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0x0, "Device IP", HFILL }},
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{ &hf_ciscowl_null2,
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{ "Null2", "ciscowl.null2", FT_BYTES, BASE_HEX, NULL,
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0x0, "", HFILL }},
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{ &hf_ciscowl_name,
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{ "Name", "ciscowl.name", FT_STRING, BASE_NONE, NULL,
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0x0, "Device Name", HFILL }},
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{ &hf_ciscowl_unknown3,
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{ "Unknown3", "ciscowl.unknown3", FT_BYTES, BASE_HEX, NULL,
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0x0, "", HFILL }},
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{ &hf_ciscowl_unknown4,
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{ "Unknown4", "ciscowl.unknown4", FT_BYTES, BASE_HEX, NULL,
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0x0, "", HFILL }},
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{ &hf_ciscowl_version,
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{ "Version", "ciscowl.version", FT_STRING, BASE_NONE, NULL,
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0x0, "Device Version String", HFILL }},
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{ &hf_ciscowl_rest,
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{ "Rest", "ciscowl.rest", FT_BYTES, BASE_HEX, NULL,
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0x0, "Unknown remaining data", HFILL }},
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};
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static gint *ett[] = {
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&ett_ciscowl,
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};
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proto_ciscowl = proto_register_protocol(PROTO_LONG_NAME,
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PROTO_SHORT_NAME, "ciscowl");
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proto_register_field_array(proto_ciscowl, hf, array_length(hf));
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proto_register_subtree_array(ett, array_length(ett));
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}
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void
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proto_reg_handoff_ciscowl(void)
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{
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dissector_handle_t ciscowl_handle;
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ciscowl_handle = create_dissector_handle(dissect_ciscowl, proto_ciscowl);
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dissector_add("llc.ciscowl_pid", 0x0000, ciscowl_handle);
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dissector_add("ethertype", ETHERTYPE_CISCOWL, ciscowl_handle);
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}
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void
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proto_register_ciscowl_oui(void)
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{
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static hf_register_info hf = {
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&hf_llc_ciscowl_pid,
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{ "PID", "llc.ciscowl_pid", FT_UINT16, BASE_HEX,
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VALS(cisco_pid_vals), 0x0, "", HFILL },
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};
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llc_add_oui(OUI_CISCOWL, "llc.ciscowl_pid", "Cisco Wireless OUI PID", &hf);
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}
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