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/* packet-ieee80211-airopeek.c
* Routines for pre-V9 WildPackets AiroPeek header dissection
*
* Wireshark - Network traffic analyzer
* By Gerald Combs <gerald@wireshark.org>
* Copyright 1998 Gerald Combs
*
* 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., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
*/
#include "config.h"
#include <epan/packet.h>
#include <wiretap/wtap.h>
void proto_register_ieee80211_airopeek(void);
void proto_reg_handoff_ieee80211_airopeek(void);
static dissector_handle_t ieee80211_handle;
static int proto_airopeek = -1;
static int hf_data_rate = -1;
static int hf_channel = -1;
static int hf_signal_strength = -1;
static gint ett_airopeek = -1;
static void
dissect_airopeek(tvbuff_t *tvb, packet_info *pinfo, proto_tree *tree)
{
proto_tree *airopeek_tree = NULL;
proto_item *ti;
guint8 data_rate;
guint8 signal_level;
tvbuff_t *next_tvb;
col_set_str(pinfo->cinfo, COL_PROTOCOL, "AiroPeek");
col_clear(pinfo->cinfo, COL_INFO);
/* Dissect the header */
if (tree) {
ti = proto_tree_add_item(tree, proto_airopeek, tvb, 0, 4, ENC_NA);
airopeek_tree = proto_item_add_subtree(ti, ett_airopeek);
}
data_rate = tvb_get_guint8(tvb, 0);
/* Add the radio information to the column information */
col_add_fstr(pinfo->cinfo, COL_TX_RATE, "%u.%u",
data_rate / 2,
data_rate & 1 ? 5 : 0);
if (tree) {
proto_tree_add_uint64_format_value(airopeek_tree, hf_data_rate, tvb, 0, 1,
(guint64)data_rate * 500000,
"%u.%u Mb/s",
data_rate / 2,
data_rate & 1 ? 5 : 0);
}
if (tree)
proto_tree_add_item(airopeek_tree, hf_channel, tvb, 1, 1, ENC_BIG_ENDIAN);
signal_level = tvb_get_guint8(tvb, 2);
/*
* This is signal strength as a percentage of the maximum, i.e.
* (RXVECTOR RSSI/RXVECTOR RSSI_Max)*100, or, at least, that's
* what I infer it is, given what the WildPackets note "Converting
* Signal Strength Percentage to dBm Values" says.
*
* It also says that the conversion the percentage to a dBm value is
* an adapter-dependent process, so, as we don't know what type of
* adapter was used to do the capture, we can't do the conversion.
*/
col_add_fstr(pinfo->cinfo, COL_RSSI, "%u%%", signal_level);
proto_tree_add_uint_format_value(airopeek_tree, hf_signal_strength, tvb, 2, 1,
signal_level,
"%u%%",
signal_level);
/* dissect the 802.11 header next */
pinfo->current_proto = "IEEE 802.11";
next_tvb = tvb_new_subset_remaining(tvb, 4);
call_dissector(ieee80211_handle, next_tvb, pinfo, tree);
}
void proto_register_ieee80211_airopeek(void)
{
static hf_register_info hf[] = {
{&hf_data_rate,
{"Data Rate", "airopeek.data_rate", FT_UINT64, BASE_DEC, NULL, 0,
"Data rate (b/s)", HFILL }},
{&hf_channel,
{"Channel", "airopeek.channel", FT_UINT8, BASE_DEC, NULL, 0,
"802.11 channel number that this frame was sent/received on", HFILL }},
{&hf_signal_strength,
{"Signal Strength", "airopeek.signal_strength", FT_UINT8, BASE_DEC, NULL, 0,
"Signal strength (Percentage)", HFILL }}
};
static gint *tree_array[] = {
&ett_airopeek
};
proto_airopeek = proto_register_protocol("AiroPeek 802.11 radio information",
"AiroPeek",
"airopeek");
proto_register_field_array(proto_airopeek, hf, array_length(hf));
proto_register_subtree_array(tree_array, array_length(tree_array));
}
void proto_reg_handoff_ieee80211_airopeek(void)
{
dissector_handle_t airopeek_handle;
/* Register handoff to airopeek-header dissectors */
airopeek_handle = create_dissector_handle(dissect_airopeek, proto_airopeek);
dissector_add_uint("wtap_encap", WTAP_ENCAP_IEEE_802_11_AIROPEEK,
airopeek_handle);
ieee80211_handle = find_dissector("wlan");
}
/*
* Editor modelines
*
* Local Variables:
* c-basic-offset: 2
* tab-width: 8
* indent-tabs-mode: nil
* End:
*
* ex: set shiftwidth=2 tabstop=8 expandtab:
* :indentSize=2:tabSize=8:noTabs=true:
*/
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