8ee4a65f76
header. Add overflow checks to "BYTES_ARE_IN_FRAME()", and cast all arguments to unsigned values (negative values should never be passed) to squelch compiler warnings. svn path=/trunk/; revision=6567
281 lines
8.8 KiB
C
281 lines
8.8 KiB
C
/*
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* packet-wlancap.c
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* Decode packets with a AVS-WLAN header
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*
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* AVS linux-wlan-based products use a new sniff header to replace the
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* old prism2-specific one dissected in packet-prism2.c. This one has
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* additional fields, is designed to be non-hardware-specific, and more
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* importantly, version and length fields so it can be extended later
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* without breaking anything.
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*
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* By Solomon Peachy
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*
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* $Id: packet-wlancap.c,v 1.1 2002/11/06 21:49:29 guy Exp $
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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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* Copied from README.developer
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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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#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 <string.h>
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#include <epan/packet.h>
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#include "packet-ieee80211.h"
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#include "packet-wlancap.h"
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#define SHORT_STR 256
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/* protocol */
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static int proto_wlancap = -1;
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/* header attached during wlan monitor mode */
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struct wlan_header_v1 {
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guint32 version;
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guint32 length;
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guint64 mactime;
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guint64 hosttime;
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guint32 phytype;
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guint32 channel;
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guint32 datarate;
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guint32 antenna;
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guint32 priority;
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guint32 ssi_type;
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gint32 ssi_signal;
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gint32 ssi_noise;
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gint32 preamble;
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gint32 encoding;
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};
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static int hf_wlan_version = -1;
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static int hf_wlan_length = -1;
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static int hf_wlan_mactime = -1;
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static int hf_wlan_hosttime = -1;
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static int hf_wlan_phytype = -1;
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static int hf_wlan_channel = -1;
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static int hf_wlan_datarate = -1;
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static int hf_wlan_antenna = -1;
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static int hf_wlan_priority = -1;
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static int hf_wlan_ssi_type = -1;
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static int hf_wlan_ssi_signal = -1;
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static int hf_wlan_ssi_noise = -1;
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static int hf_wlan_preamble = -1;
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static int hf_wlan_encoding = -1;
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static gint ett_wlan = -1;
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static dissector_handle_t ieee80211_handle;
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static void
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dissect_wlancap(tvbuff_t *tvb, packet_info *pinfo, proto_tree *tree);
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void
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capture_wlancap(const guchar *pd, int offset, int len, packet_counts *ld)
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{
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/* XXX eventually add in a version test. */
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if(!BYTES_ARE_IN_FRAME(offset, len, (int)sizeof(struct wlan_header_v1))) {
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ld->other ++;
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return;
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}
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offset += sizeof(struct wlan_header_v1);
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/* 802.11 header follows */
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capture_ieee80211(pd, offset, len, ld);
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}
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void
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proto_register_wlancap(void)
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{
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static const value_string phy_type[] = {
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{ 0, "Unknown" },
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{ 1, "FHSS 802.11 '97" },
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{ 2, "DSSS 802.11 '97" },
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{ 3, "IR Baseband" },
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{ 4, "DSSS 802.11b" },
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{ 5, "PBCC 802.11b" },
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{ 6, "OFDM 802.11g" },
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{ 7, "PBCC 802.11g" },
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{ 8, "OFDM 802.11a" },
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};
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static const value_string encoding_type[] = {
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{ 0, "Unknown" },
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{ 1, "CCK" },
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{ 2, "PBCC" },
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{ 3, "OFDM" },
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};
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static const value_string ssi_type[] = {
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{ 0, "None" },
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{ 1, "Normalized RSSI" },
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{ 2, "dBm" },
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{ 3, "Raw RSSI" },
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};
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static const value_string preamble_type[] = {
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{ 0, "Unknown" },
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{ 1, "Short" },
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{ 2, "Long" },
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};
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static hf_register_info hf[] = {
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{ &hf_wlan_version, { "Header revision", "wlancap.version", FT_UINT32,
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BASE_DEC, NULL, 0x0, "", HFILL } },
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{ &hf_wlan_length, { "Header length", "wlancap.length", FT_UINT32,
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BASE_DEC, NULL, 0x0, "", HFILL } },
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{ &hf_wlan_mactime, { "MAC timestamp", "wlancap.mactime", FT_UINT64,
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BASE_DEC, NULL, 0x0, "", HFILL } },
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{ &hf_wlan_hosttime, { "Host timestamp", "wlancap.hosttime", FT_UINT64,
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BASE_DEC, NULL, 0x0, "", HFILL } },
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{ &hf_wlan_phytype, { "PHY type", "wlancap.phytype", FT_UINT32, BASE_DEC,
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VALS(phy_type), 0x0, "", HFILL } },
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{ &hf_wlan_channel, { "Channel", "wlancap.channel", FT_UINT32, BASE_DEC,
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NULL, 0x0, "", HFILL } },
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{ &hf_wlan_datarate, { "Data rate", "wlancap.datarate", FT_UINT32,
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BASE_DEC, NULL, 0x0, "", HFILL } },
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{ &hf_wlan_antenna, { "Antenna", "wlancap.antenna", FT_UINT32, BASE_DEC,
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NULL, 0x0, "", HFILL } },
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{ &hf_wlan_priority, { "Priority", "wlancap.priority", FT_UINT32, BASE_DEC,
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NULL, 0x0, "", HFILL } },
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{ &hf_wlan_ssi_type, { "SSI Type", "wlancap.ssi_type", FT_UINT32, BASE_DEC,
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VALS(ssi_type), 0x0, "", HFILL } },
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{ &hf_wlan_ssi_signal, { "SSI Signal", "wlancap.ssi_signal", FT_UINT32,
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BASE_DEC, NULL, 0x0, "", HFILL } },
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{ &hf_wlan_ssi_noise, { "SSI Noise", "wlancap.ssi_noise", FT_INT32,
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BASE_DEC, NULL, 0x0, "", HFILL } },
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{ &hf_wlan_preamble, { "Preamble", "wlancap.preamble", FT_UINT32,
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BASE_DEC, VALS(preamble_type), 0x0, "", HFILL } },
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{ &hf_wlan_encoding, { "Encoding Type", "wlancap.encoding", FT_UINT32,
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BASE_DEC, VALS(encoding_type), 0x0, "", HFILL } },
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};
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static gint *ett[] = {
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&ett_wlan
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};
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proto_wlancap = proto_register_protocol("AVS WLAN Capture header", "AVS WLANCAP", "wlancap");
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proto_register_field_array(proto_wlancap, hf, array_length(hf));
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proto_register_subtree_array(ett, array_length(ett));
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register_dissector("wlancap", dissect_wlancap, proto_wlancap);
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}
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static void
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dissect_wlancap(tvbuff_t *tvb, packet_info *pinfo, proto_tree *tree)
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{
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proto_tree *wlan_tree;
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proto_item *ti;
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tvbuff_t *next_tvb;
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int offset;
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guint32 version;
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guint32 length;
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if(check_col(pinfo->cinfo, COL_PROTOCOL))
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col_set_str(pinfo->cinfo, COL_PROTOCOL, "WLAN");
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if(check_col(pinfo->cinfo, COL_INFO))
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col_clear(pinfo->cinfo, COL_INFO);
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offset = 0;
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version = tvb_get_ntohl(tvb, offset) - WLANCAP_MAGIC_COOKIE_BASE;
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length = tvb_get_ntohl(tvb, offset+4);
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if(check_col(pinfo->cinfo, COL_INFO))
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col_add_fstr(pinfo->cinfo, COL_INFO, "AVS WLAN Capture v%x, Length %d",version, length);
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/* Dissect the packet */
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if (tree) {
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ti = proto_tree_add_protocol_format(tree, proto_wlancap,
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tvb, 0, length, "AVS WLAN Monitoring Header");
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wlan_tree = proto_item_add_subtree(ti, ett_wlan);
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proto_tree_add_uint(wlan_tree, hf_wlan_version, tvb, offset,
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4, tvb_get_ntohl(tvb, offset) - WLANCAP_MAGIC_COOKIE_BASE);
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offset+=4;
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proto_tree_add_uint(wlan_tree, hf_wlan_length, tvb, offset,
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4, tvb_get_ntohl(tvb, offset));
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offset+=4;
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proto_tree_add_item(wlan_tree, hf_wlan_mactime, tvb, offset,
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8, FALSE);
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offset+=8;
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proto_tree_add_item(wlan_tree, hf_wlan_hosttime, tvb, offset,
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8, FALSE);
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offset+=8;
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proto_tree_add_uint(wlan_tree, hf_wlan_phytype, tvb, offset,
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4, tvb_get_ntohl(tvb, offset));
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offset+=4;
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/* XXX cook channel (fh uses different numbers) */
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proto_tree_add_uint(wlan_tree, hf_wlan_channel, tvb, offset,
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4, tvb_get_ntohl(tvb, offset));
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offset+=4;
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proto_tree_add_uint_format(wlan_tree, hf_wlan_datarate, tvb, offset,
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4, tvb_get_ntohl(tvb, offset) * 100,
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"Datarate: %d kbps",
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tvb_get_ntohl(tvb, offset) * 100);
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offset+=4;
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proto_tree_add_uint(wlan_tree, hf_wlan_antenna, tvb, offset,
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4, tvb_get_ntohl(tvb, offset));
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offset+=4;
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proto_tree_add_uint(wlan_tree, hf_wlan_priority, tvb, offset,
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4, tvb_get_ntohl(tvb, offset));
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offset+=4;
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proto_tree_add_uint(wlan_tree, hf_wlan_ssi_type, tvb, offset,
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4, tvb_get_ntohl(tvb, offset));
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offset+=4;
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/* XXX cook ssi_signal (Based on type; ie format) */
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proto_tree_add_uint(wlan_tree, hf_wlan_ssi_signal, tvb, offset,
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4, tvb_get_ntohl(tvb, offset));
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offset+=4;
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/* XXX cook ssi_noise (Based on type; ie format) */
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proto_tree_add_int(wlan_tree, hf_wlan_ssi_noise, tvb, offset,
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4, tvb_get_ntohl(tvb, offset));
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offset+=4;
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proto_tree_add_uint(wlan_tree, hf_wlan_preamble, tvb, offset,
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4, tvb_get_ntohl(tvb, offset));
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offset+=4;
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proto_tree_add_uint(wlan_tree, hf_wlan_encoding, tvb, offset,
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4, tvb_get_ntohl(tvb, offset));
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offset+=4;
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}
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if (offset == 0)
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offset = length;
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/* dissect the 802.11 header next */
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next_tvb = tvb_new_subset(tvb, offset, -1, -1);
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call_dissector(ieee80211_handle, next_tvb, pinfo, tree);
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}
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void
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proto_reg_handoff_wlancap(void)
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{
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dissector_handle_t wlancap_handle;
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/* handle for 802.11 dissector */
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ieee80211_handle = find_dissector("wlan");
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wlancap_handle = create_dissector_handle(dissect_wlancap, proto_wlancap);
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dissector_add("wtap_encap", WTAP_ENCAP_WLAN_HEADER, wlancap_handle);
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}
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