forked from osmocom/wireshark
227 lines
7.1 KiB
C
227 lines
7.1 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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* 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., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 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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#include "config.h"
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#include <wiretap/wtap.h>
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#include <epan/packet.h>
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#include <epan/exceptions.h>
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#include <epan/expert.h>
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#include <epan/prefs.h>
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#include <epan/show_exception.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 expert_field ie_ieee80211_subpacket = EI_INIT;
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static dissector_handle_t ieee80211_radio_handle;
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static int
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dissect_cwids(tvbuff_t *tvb, packet_info *pinfo, proto_tree *tree, void* data _U_)
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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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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(tvb_reported_length_remaining(tvb, offset) > 0) {
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struct ieee_802_11_phdr phdr;
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ti = proto_tree_add_item(tree, proto_cwids, tvb, offset, 28, ENC_NA);
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cwids_tree = proto_item_add_subtree(ti, ett_cwids);
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memset(&phdr, 0, sizeof(phdr));
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phdr.fcs_len = 0; /* no FCS */
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phdr.decrypted = FALSE;
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phdr.datapad = FALSE;
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phdr.phy = PHDR_802_11_PHY_UNKNOWN;
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proto_tree_add_item(cwids_tree, hf_cwids_version, tvb, offset, 2, ENC_BIG_ENDIAN);
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offset += 2;
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proto_tree_add_item(cwids_tree, hf_cwids_unknown1, tvb, offset, 7, ENC_NA);
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offset += 7;
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phdr.has_channel = TRUE;
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phdr.channel = tvb_get_guint8(tvb, offset);
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proto_tree_add_item(cwids_tree, hf_cwids_channel, tvb, offset, 1, ENC_BIG_ENDIAN);
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offset += 1;
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proto_tree_add_item(cwids_tree, hf_cwids_unknown2, tvb, offset, 6, ENC_NA);
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offset += 6;
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proto_tree_add_item(cwids_tree, hf_cwids_reallength, tvb, offset, 2, ENC_BIG_ENDIAN);
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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, ENC_BIG_ENDIAN);
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offset += 2;
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proto_tree_add_item(cwids_tree, hf_cwids_unknown3, tvb, offset, 8, ENC_NA);
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offset += 8;
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wlan_tvb = tvb_new_subset_length(tvb, offset, capturelen);
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/* Continue after ieee80211 dissection errors */
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TRY {
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call_dissector_with_data(ieee80211_radio_handle, wlan_tvb, pinfo, tree, &phdr);
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} CATCH_BOUNDS_ERRORS {
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show_exception(wlan_tvb, pinfo, tree, EXCEPT_CODE, GET_MESSAGE);
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expert_add_info(pinfo, ti, &ie_ieee80211_subpacket);
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} ENDTRY;
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offset += capturelen;
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}
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return tvb_captured_length(tvb);
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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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static ei_register_info ei[] = {
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{ &ie_ieee80211_subpacket, { "cwids.ieee80211_malformed", PI_MALFORMED, PI_ERROR, "Malformed or short IEEE80211 subpacket", EXPFILL }},
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};
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module_t *cwids_module;
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expert_module_t* expert_cwids;
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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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expert_cwids = expert_register_protocol(proto_cwids);
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expert_register_field_array(expert_cwids, ei, array_length(ei));
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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_for_decode_as("udp.port", cwids_handle);
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ieee80211_radio_handle = find_dissector_add_dependency("wlan_radio", proto_cwids);
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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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/*
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* Editor modelines - http://www.wireshark.org/tools/modelines.html
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*
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* Local variables:
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* c-basic-offset: 8
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* tab-width: 8
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* indent-tabs-mode: t
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* End:
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*
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* vi: set shiftwidth=8 tabstop=8 noexpandtab:
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* :indentSize=8:tabSize=8:noTabs=false:
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*/
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