![Guy Harris](/assets/img/avatar_default.png)
keys to have _uint in their names, to match the routines that handle dissector tables with string keys. (Using _port can confuse people into thinking they're intended solely for use with TCP/UDP/etc. ports when, in fact, they work better for things such as Ethernet types, where the binding of particular values to particular protocols are a lot stronger.) svn path=/trunk/; revision=35224
222 lines
6.7 KiB
C
222 lines
6.7 KiB
C
/* packet-cwids.c
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* Routines for dissecting wireless ids packets sent from a Cisco
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* access point to the WLSE (or whatever)
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*
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* $Id$
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*
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* Copyright 2006 Joerg Mayer (see AUTHORS file)
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*
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* Wireshark - Network traffic analyzer
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* By Gerald Combs <gerald@wireshark.org>
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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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/* With current IOS, you can use Cisco wireless Bridges/APs as
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* wireless sniffers and configure them to send the data to some
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* central IDS:
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* interface dot11Radio 0
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* station-role scanner
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* monitor frames endpoint ip address 172.22.1.1 port 8999 truncate 2312
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* These frames are raw, i.e. they don't have a pcap header.
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* Running wireshark at the receiving end will provide those.
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*/
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/* 2do:
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* - Find out more about the contents of the capture header
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* - Protect the address fields etc (all columns?)
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* - Create subelements and put each header and packet into it
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* - fuzz-test the dissector
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* - Find some heuristic to detect the packet automagically and
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* convert dissector into a heuristic dissector
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* - Is the TRY/CATCH stuff OK?
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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 <glib.h>
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#include <epan/packet.h>
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#include <epan/etypes.h>
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#include <epan/expert.h>
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#include <epan/prefs.h>
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static guint global_udp_port = 0;
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static int proto_cwids = -1;
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static int hf_cwids_version = -1;
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static int hf_cwids_unknown1 = -1;
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static int hf_cwids_channel = -1;
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static int hf_cwids_unknown2 = -1;
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static int hf_cwids_reallength = -1;
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static int hf_cwids_capturelen = -1;
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static int hf_cwids_unknown3 = -1;
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static gint ett_cwids = -1;
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static dissector_handle_t ieee80211_handle;
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static void
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dissect_cwids(tvbuff_t *tvb, packet_info *pinfo, proto_tree *tree)
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{
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tvbuff_t *wlan_tvb;
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proto_tree *ti, *cwids_tree;
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volatile int offset = 0;
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guint16 capturelen;
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guint remain;
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void *pd_save;
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col_set_str(pinfo->cinfo, COL_PROTOCOL, "CWIDS");
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col_set_str(pinfo->cinfo, COL_INFO, "Cwids: ");
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/* FIXME: col_set_fence(pinfo->cinfo, all-cols, only addr-cols?); */
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cwids_tree = NULL;
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while((remain = tvb_length_remaining(tvb, offset)) > 0) {
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ti = proto_tree_add_item(tree, proto_cwids, tvb, offset, 28, FALSE);
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cwids_tree = proto_item_add_subtree(ti, ett_cwids);
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proto_tree_add_item(cwids_tree, hf_cwids_version, tvb, offset, 2, FALSE);
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offset += 2;
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proto_tree_add_item(cwids_tree, hf_cwids_unknown1, tvb, offset, 7, FALSE);
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offset += 7;
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proto_tree_add_item(cwids_tree, hf_cwids_channel, tvb, offset, 1, FALSE);
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offset += 1;
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proto_tree_add_item(cwids_tree, hf_cwids_unknown2, tvb, offset, 6, FALSE);
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offset += 6;
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proto_tree_add_item(cwids_tree, hf_cwids_reallength, tvb, offset, 2, FALSE);
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offset += 2;
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capturelen = tvb_get_ntohs(tvb, offset);
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proto_tree_add_item(cwids_tree, hf_cwids_capturelen, tvb, offset, 2, FALSE);
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offset += 2;
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proto_tree_add_item(cwids_tree, hf_cwids_unknown3, tvb, offset, 8, FALSE);
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offset += 8;
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wlan_tvb = tvb_new_subset(tvb, offset, capturelen, capturelen);
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/* Continue after ieee80211 dissection errors */
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pd_save = pinfo->private_data;
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TRY {
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call_dissector(ieee80211_handle, wlan_tvb, pinfo, tree);
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} CATCH2(BoundsError, ReportedBoundsError) {
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expert_add_info_format(pinfo, NULL,
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PI_MALFORMED, PI_ERROR,
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"Malformed or short IEEE80211 subpacket");
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/* Restore the private_data structure in case one of the
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* called dissectors modified it (and, due to the exception,
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* was unable to restore it).
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*/
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pinfo->private_data = pd_save;
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if (check_col(pinfo->cinfo, COL_INFO)) {
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col_append_str(pinfo->cinfo, COL_INFO,
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" [Malformed or short IEEE80211 subpacket] " );
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col_set_fence(pinfo->cinfo, COL_INFO);
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}
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wlan_tvb = tvb_new_subset(tvb, offset, capturelen, capturelen);
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#if 0
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/* FIXME: Why does this throw an exception? */
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proto_tree_add_text(cwids_tree, wlan_tvb, offset, capturelen,
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"[Malformed or short IEEE80211 subpacket]");
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#endif
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;
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} ENDTRY;
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offset += capturelen;
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}
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}
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void proto_register_cwids(void);
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void proto_reg_handoff_cwids(void);
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void
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proto_register_cwids(void)
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{
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static hf_register_info hf[] = {
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{ &hf_cwids_version,
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{ "Capture Version", "cwids.version", FT_UINT16, BASE_DEC, NULL,
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0x0, "Version or format of record", HFILL }},
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{ &hf_cwids_unknown1,
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{ "Unknown1", "cwids.unknown1", FT_BYTES, BASE_NONE, NULL,
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0x0, "1st Unknown block - timestamp?", HFILL }},
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{ &hf_cwids_channel,
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{ "Channel", "cwids.channel", FT_UINT8, BASE_DEC, NULL,
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0x0, "Channel for this capture", HFILL }},
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{ &hf_cwids_unknown2,
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{ "Unknown2", "cwids.unknown2", FT_BYTES, BASE_NONE, NULL,
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0x0, "2nd Unknown block", HFILL }},
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{ &hf_cwids_reallength,
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{ "Original length", "cwids.reallen", FT_UINT16, BASE_DEC, NULL,
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0x0, "Original num bytes in frame", HFILL }},
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{ &hf_cwids_capturelen,
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{ "Capture length", "cwids.caplen", FT_UINT16, BASE_DEC, NULL,
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0x0, "Captured bytes in record", HFILL }},
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{ &hf_cwids_unknown3,
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{ "Unknown3", "cwids.unknown3", FT_BYTES, BASE_NONE, NULL,
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0x0, "3rd Unknown block", HFILL }},
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};
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static gint *ett[] = {
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&ett_cwids,
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};
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module_t *cwids_module;
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proto_cwids = proto_register_protocol("Cisco Wireless IDS Captures", "CWIDS", "cwids");
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proto_register_field_array(proto_cwids, hf, array_length(hf));
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proto_register_subtree_array(ett, array_length(ett));
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cwids_module = prefs_register_protocol(proto_cwids, proto_reg_handoff_cwids);
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prefs_register_uint_preference(cwids_module, "udp.port",
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"CWIDS port",
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"Set the destination UDP port Cisco wireless IDS messages",
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10, &global_udp_port);
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}
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void
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proto_reg_handoff_cwids(void)
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{
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static dissector_handle_t cwids_handle;
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static guint saved_udp_port;
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static gboolean initialized = FALSE;
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if (!initialized) {
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cwids_handle = create_dissector_handle(dissect_cwids, proto_cwids);
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dissector_add_handle("udp.port", cwids_handle);
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ieee80211_handle = find_dissector("wlan");
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initialized = TRUE;
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} else {
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if (saved_udp_port != 0) {
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dissector_delete_uint("udp.port", saved_udp_port, cwids_handle);
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}
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}
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if (global_udp_port != 0) {
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dissector_add_uint("udp.port", global_udp_port, cwids_handle);
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}
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saved_udp_port = global_udp_port;
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}
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