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wireshark/packet-tzsp.c

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/* packet-tzsp.c
*
* $Id: packet-tzsp.c,v 1.6 2004/01/29 10:58:28 guy Exp $
*
* Copyright 2002, Tazmen Technologies Inc
*
* Tazmen Sniffer Protocol for encapsulating the packets across a network
* from a remote packet sniffer. TZSP can encapsulate any other protocol.
*
* Ethereal - Network traffic analyzer
* By Gerald Combs <gerald@ethereal.com>
* 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., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
*/
#ifdef HAVE_CONFIG_H
# include "config.h"
#endif
#ifdef HAVE_SYS_TYPES_H
# include <sys/types.h>
#endif
#include <glib.h>
#include <epan/packet.h>
#define UDP_PORT_TZSP 0x9090
static int proto_tzsp = -1;
static int hf_tzsp_version = -1;
static int hf_tzsp_type = -1;
static int hf_tzsp_encap = -1;
static const value_string tzsp_type[] = {
{0, "Received tag list"},
{1, "Packet for transmit"},
{2, "Reserved"},
{3, "Configuration"},
{4, "Keepalive"},
{5, "Port opener"},
{0, NULL}
};
static gint ett_tzsp = -1;
static dissector_handle_t data_handle;
static dissector_table_t encap_dissector_table;
/* ************************************************************************* */
/* WLAN radio header felds */
/* ************************************************************************* */
static int hf_status_field = -1;
static int hf_status_msg_type = -1;
static int hf_status_pcf = -1;
static int hf_status_mac_port = -1;
static int hf_status_undecrypted = -1;
static int hf_status_fcs_error = -1;
static int hf_time = -1;
static int hf_silence = -1;
static int hf_signal = -1;
static int hf_rate = -1;
static int hf_channel = -1;
static int hf_unknown = -1;
static int hf_original_length = -1;
static int hf_sensormac = -1;
/* ************************************************************************* */
/* Encapsulation type values */
/* Note that these are not all the same as DLT_ values */
/* ************************************************************************* */
#define TZSP_ENCAP_ETHERNET 1
#define TZSP_ENCAP_IEEE_802_11 18
#define TZSP_ENCAP_PRISM_HEADER 119
#define TZSP_ENCAP_WLAN_AVS 127
/* ************************************************************************* */
/* Generic header options */
/* ************************************************************************* */
#define TZSP_HDR_PAD 0 /* Pad. */
#define TZSP_HDR_END 1 /* End of the list. */
#define TZSP_HDR_ORIGINAL_LENGTH 41 /* Length of the packet before slicing. 2 bytes. */
#define TZSP_HDR_SENSOR 60 /* Sensor MAC address packet was received on, 6 byte ethernet address.*/
/* ************************************************************************* */
/* Options for 802.11 radios */
/* ************************************************************************* */
#define WLAN_RADIO_HDR_SIGNAL 10 /* Signal strength in dBm, signed byte. */
#define WLAN_RADIO_HDR_NOISE 11 /* Noise level in dBm, signed byte. */
#define WLAN_RADIO_HDR_RATE 12 /* Data rate, unsigned byte. */
#define WLAN_RADIO_HDR_TIMESTAMP 13 /* Timestamp in us, unsigned 32-bits network byte order. */
#define WLAN_RADIO_HDR_MSG_TYPE 14 /* Packet type, unsigned byte. */
#define WLAN_RADIO_HDR_CF 15 /* Whether packet arrived during CF period, unsigned byte. */
#define WLAN_RADIO_HDR_UN_DECR 16 /* Whether packet could not be decrypted by MAC, unsigned byte. */
#define WLAN_RADIO_HDR_FCS_ERR 17 /* Whether packet contains an FCS error, unsigned byte. */
#define WLAN_RADIO_HDR_CHANNEL 18 /* Channel number packet was received on, unsigned byte.*/
/* ************************************************************************* */
/* Add option information to the display */
/* ************************************************************************* */
static int
add_option_info(tvbuff_t *tvb, int pos, proto_tree *tree, proto_item *ti)
{
guint8 tag, length, fcs_err = 0, encr = 0, seen_fcs_err = 0;
/*
* Read all option tags in an endless loop. If the packet is malformed this
* loop might be a problem.
*/
while (TRUE) {
tag = tvb_get_guint8(tvb, pos++);
switch (tag) {
case TZSP_HDR_PAD:
length = 0;
break;
case TZSP_HDR_END:
/* Fill in header with information from other tags. */
if (seen_fcs_err) {
if (tree)
proto_item_append_text(ti,"%s", fcs_err?"FCS Error":(encr?"Encrypted":"Good"));
}
return pos;
case TZSP_HDR_ORIGINAL_LENGTH:
length = tvb_get_guint8(tvb, pos++);
if (tree)
proto_tree_add_int (tree, hf_original_length, tvb, pos-2, 4,
tvb_get_ntohs(tvb, pos));
pos += length;
break;
case WLAN_RADIO_HDR_SIGNAL:
length = tvb_get_guint8(tvb, pos++);
if (tree)
proto_tree_add_int (tree, hf_signal, tvb, pos-2, 3,
tvb_get_ntohs(tvb, pos));
pos += length;
break;
case WLAN_RADIO_HDR_NOISE:
length = tvb_get_guint8(tvb, pos++);
if (tree)
proto_tree_add_int (tree, hf_silence, tvb, pos-2, 3,
tvb_get_ntohs(tvb, pos));
pos += length;
break;
case WLAN_RADIO_HDR_RATE:
length = tvb_get_guint8(tvb, pos++);
if (tree)
proto_tree_add_uint (tree, hf_rate, tvb, pos-2, 3,
tvb_get_guint8(tvb, pos));
pos += length;
break;
case WLAN_RADIO_HDR_TIMESTAMP:
length = tvb_get_guint8(tvb, pos++);
if (tree)
proto_tree_add_uint (tree, hf_time, tvb, pos-2, 6,
tvb_get_ntohl(tvb, pos));
pos += length;
break;
case WLAN_RADIO_HDR_MSG_TYPE:
length = tvb_get_guint8(tvb, pos++);
if (tree)
proto_tree_add_uint (tree, hf_status_msg_type, tvb, pos-2, 3,
tvb_get_guint8(tvb, pos));
pos += length;
break;
case WLAN_RADIO_HDR_CF:
length = tvb_get_guint8(tvb, pos++);
if (tree)
proto_tree_add_boolean (tree, hf_status_pcf, tvb, pos-2, 3,
tvb_get_guint8(tvb, pos));
pos += length;
break;
case WLAN_RADIO_HDR_UN_DECR:
length = tvb_get_guint8(tvb, pos++);
if (tree)
proto_tree_add_boolean (tree, hf_status_undecrypted, tvb, pos-2, 3,
tvb_get_guint8(tvb, pos));
encr = tvb_get_guint8(tvb, pos);
pos += length;
break;
case WLAN_RADIO_HDR_FCS_ERR:
seen_fcs_err = 1;
length = tvb_get_guint8(tvb, pos++);
if (tree)
proto_tree_add_boolean (tree, hf_status_fcs_error, tvb, pos-2, 3,
tvb_get_guint8(tvb, pos));
fcs_err = tvb_get_guint8(tvb, pos);
pos += length;
break;
case WLAN_RADIO_HDR_CHANNEL:
length = tvb_get_guint8(tvb, pos++);
if (tree)
proto_tree_add_uint (tree, hf_channel, tvb, pos-2, 3,
tvb_get_guint8(tvb, pos));
pos += length;
break;
case TZSP_HDR_SENSOR:
length = tvb_get_guint8(tvb, pos++);
if (tree)
proto_tree_add_ether(tree, hf_sensormac, tvb, pos-2, 6,
tvb_get_ptr (tvb, pos, 6));
pos += length;
break;
default:
length = tvb_get_guint8(tvb, pos++);
if (tree)
proto_tree_add_bytes(tree, hf_unknown, tvb, pos-2, length+2,
tvb_get_ptr(tvb, pos, length));
pos += length;
break;
}
}
}
/* ************************************************************************* */
/* Map TZSP encapsulation types to Wiretap encapsulation types */
/* ************************************************************************* */
struct encap_map {
guint16 tzsp_encap;
int wtap_encap;
};
static const struct encap_map map_table[] = {
{ TZSP_ENCAP_ETHERNET, WTAP_ENCAP_ETHERNET },
{ TZSP_ENCAP_PRISM_HEADER, WTAP_ENCAP_PRISM_HEADER },
{ TZSP_ENCAP_WLAN_AVS, WTAP_ENCAP_IEEE_802_11_WLAN_AVS },
{ TZSP_ENCAP_IEEE_802_11, WTAP_ENCAP_IEEE_802_11 },
{ 0, -1 }
};
static int
tzsp_encap_to_wtap_encap(guint16 encap)
{
int i;
for (i = 0; map_table[i].wtap_encap != -1; i++) {
if (map_table[i].tzsp_encap == encap)
return map_table[i].wtap_encap;
}
return -1;
}
/* ************************************************************************* */
/* Dissect a TZSP packet */
/* ************************************************************************* */
static void
dissect_tzsp(tvbuff_t *tvb, packet_info *pinfo, proto_tree *tree)
{
proto_tree *tzsp_tree = NULL;
proto_item *ti = NULL;
int pos = 0;
tvbuff_t *next_tvb;
guint16 encapsulation = 0;
int wtap_encap;
dissector_handle_t encap_dissector;
char *encap_name, *info;
guint8 type;
if (check_col(pinfo->cinfo, COL_PROTOCOL))
col_set_str(pinfo->cinfo, COL_PROTOCOL, "TZSP");
if (check_col(pinfo->cinfo, COL_INFO))
col_clear(pinfo->cinfo, COL_INFO);
type = tvb_get_guint8(tvb, 1);
/* Find the dissector. */
encapsulation = tvb_get_ntohs(tvb, 2);
if (encapsulation != 0) {
wtap_encap = tzsp_encap_to_wtap_encap(encapsulation);
if (wtap_encap != -1 &&
(encap_dissector = dissector_get_port_handle(encap_dissector_table, wtap_encap))) {
encap_name = dissector_handle_get_short_name(encap_dissector);
}
else {
encap_name = "Unknown";
}
info = encap_name;
}
else {
wtap_encap = -1;
encap_name = "Nothing";
info = tzsp_type[type].strptr;
}
if (check_col(pinfo->cinfo, COL_INFO))
col_set_str(pinfo->cinfo, COL_INFO, info);
if (tree) {
/* Adding TZSP item and subtree */
ti = proto_tree_add_protocol_format(tree, proto_tzsp, tvb, 0,
-1, "TZSP: %s: ", info);
tzsp_tree = proto_item_add_subtree(ti, ett_tzsp);
proto_tree_add_item (tzsp_tree, hf_tzsp_version, tvb, 0, 1,
FALSE);
proto_tree_add_uint (tzsp_tree, hf_tzsp_type, tvb, 1, 1,
type);
proto_tree_add_uint_format (tzsp_tree, hf_tzsp_encap, tvb, 2, 2,
encapsulation, "Encapsulates: %s (%d)",
encap_name, encapsulation);
}
if (type != 4 && type != 5) {
pos = add_option_info(tvb, 4, tzsp_tree, ti);
if (tree)
proto_item_set_end(ti, tvb, pos);
next_tvb = tvb_new_subset(tvb, pos, -1, -1);
if (encapsulation != 0
&& (wtap_encap == -1
|| !dissector_try_port(encap_dissector_table, wtap_encap,
next_tvb, pinfo, tree))) {
if (check_col(pinfo->cinfo, COL_PROTOCOL))
col_set_str(pinfo->cinfo, COL_PROTOCOL, "UNKNOWN");
if (check_col(pinfo->cinfo, COL_INFO))
col_add_fstr(pinfo->cinfo, COL_INFO, "TZSP_ENCAP = %u",
encapsulation);
call_dissector(data_handle, next_tvb, pinfo, tree);
}
}
}
/* ************************************************************************* */
/* Register the TZSP dissector */
/* ************************************************************************* */
void
proto_register_tzsp(void)
{
static const value_string msg_type[] = {
{0, "Normal"},
{1, "RFC1042 encoded"},
{2, "Bridge-tunnel encoded"},
{4, "802.11 management frame"},
{0, NULL}
};
static const true_false_string pcf_flag = {
"CF: Frame received during CF period",
"Not CF"
};
static const true_false_string undecr_flag = {
"Encrypted frame could not be decrypted",
"Unencrypted"
};
static const true_false_string fcs_err_flag = {
"FCS error, frame is corrupted",
"Frame is valid"
};
static const value_string channels[] = {
/* 802.11b/g */
{1, "1 (2.412 GHz)"},
{2, "2 (2.417 GHz)"},
{3, "3 (2.422 GHz)"},
{4, "4 (2.427 GHz)"},
{5, "5 (2.432 GHz)"},
{6, "6 (2.437 GHz)"},
{7, "7 (2.442 GHz)"},
{8, "8 (2.447 GHz)"},
{9, "9 (2.452 GHz)"},
{10, "10 (2.457 GHz)"},
{11, "11 (2.462 GHz)"},
{12, "12 (2.467 GHz)"},
{13, "13 (2.472 GHz)"},
{14, "14 (2.484 GHz)"},
/* 802.11a */
{36, "36 (5.180 GHz)"},
{40, "40 (5.200 GHz)"},
{44, "44 (5.220 GHz)"},
{48, "48 (5.240 GHz)"},
{52, "52 (5.260 GHz)"},
{56, "56 (5.280 GHz)"},
{60, "60 (5.300 GHz)"},
{64, "64 (5.320 GHz)"},
{149, "149 (5.745 GHz)"},
{153, "153 (5.765 GHz)"},
{157, "157 (5.785 GHz)"},
{161, "161 (5.805 GHz)"},
{0, NULL}
};
static const value_string rates[] = {
/* Old PRISM rates */
{0x0A, "1 Mbit/s"},
{0x14, "2 Mbit/s"},
{0x37, "5.5 Mbit/s"},
{0x6E, "11 Mbit/s"},
/* MicroAP rates */
{2, "1 Mbit/s"},
{4, "2 Mbit/s"},
{11, "5.5 Mbit/s"},
{12, "6 Mbit/s"},
{18, "9 Mbit/s"},
{22, "11 Mbit/s"},
{24, "12 Mbit/s"},
{36, "18 Mbit/s"},
{48, "24 Mbit/s"},
{72, "36 Mbit/s"},
{96, "48 Mbit/s"},
{108, "54 Mbit/s"},
{0, NULL}
};
static hf_register_info hf[] = {
{ &hf_tzsp_version, {
"Version", "tzsp.version", FT_UINT8, BASE_DEC,
NULL, 0, "Version", HFILL }},
{ &hf_tzsp_type, {
"Type", "tzsp.type", FT_UINT8, BASE_DEC,
VALS(tzsp_type), 0, "Type", HFILL }},
{ &hf_tzsp_encap, {
"Encapsulation", "tzsp.encap", FT_UINT16, BASE_DEC,
NULL, 0, "Encapsulation", HFILL }},
{ &hf_status_field, {
"Status", "tzsp.wlan.status", FT_UINT16, BASE_HEX,
NULL, 0, "Status", HFILL }},
{ &hf_status_msg_type, {
"Type", "tzsp.wlan.status.msg_type", FT_UINT8, BASE_HEX,
VALS(msg_type), 0, "Message type", HFILL }},
{ &hf_status_mac_port, {
"Port", "tzsp.wlan.status.mac_port", FT_UINT8, BASE_DEC,
NULL, 0, "MAC port", HFILL }},
{ &hf_status_pcf, {
"PCF", "tzsp.wlan.status.pcf", FT_BOOLEAN, BASE_HEX,
TFS (&pcf_flag), 0, "Point Coordination Function", HFILL }},
{ &hf_status_undecrypted, {
"Undecrypted", "tzsp.wlan.status.undecrypted", FT_BOOLEAN, BASE_HEX,
TFS (&undecr_flag), 0, "Undecrypted", HFILL }},
{ &hf_status_fcs_error, {
"FCS", "tzsp.wlan.status.fcs_err", FT_BOOLEAN, BASE_HEX,
TFS (&fcs_err_flag), 0, "Frame check sequence", HFILL }},
{ &hf_time, {
"Time", "tzsp.wlan.time", FT_UINT32, BASE_HEX,
NULL, 0, "Time", HFILL }},
{ &hf_silence, {
"Silence", "tzsp.wlan.silence", FT_INT8, BASE_HEX,
NULL, 0, "Silence", HFILL }},
{ &hf_original_length, {
"Original Length", "tzsp.original_length", FT_INT16, BASE_DEC,
NULL, 0, "OrigLength", HFILL }},
{ &hf_signal, {
"Signal", "tzsp.wlan.signal", FT_INT8, BASE_HEX,
NULL, 0, "Signal", HFILL }},
{ &hf_rate, {
"Rate", "tzsp.wlan.rate", FT_UINT8, BASE_HEX,
VALS(rates), 0, "Rate", HFILL }},
{ &hf_channel, {
"Channel", "tzsp.wlan.channel", FT_UINT8, BASE_DEC,
VALS(channels), 0, "Channel", HFILL }},
{ &hf_unknown, {
"Unknown tag", "tzsp.unknown", FT_BYTES, BASE_HEX,
NULL, 0, "Unknown", HFILL }},
{ &hf_sensormac, {
"Sensor Address", "tzsp.sensormac", FT_ETHER, BASE_HEX,
NULL, 0, "Sensor MAC", HFILL }}
};
static gint *ett[] = {
&ett_tzsp
};
proto_tzsp = proto_register_protocol("Tazmen Sniffer Protocol", "TZSP",
"tzsp");
proto_register_field_array(proto_tzsp, hf, array_length(hf));
proto_register_subtree_array(ett, array_length(ett));
}
void
proto_reg_handoff_tzsp(void)
{
dissector_handle_t tzsp_handle;
tzsp_handle = create_dissector_handle(dissect_tzsp, proto_tzsp);
dissector_add("udp.port", UDP_PORT_TZSP, tzsp_handle);
/* Get the data dissector for handling unknown encapsulation types. */
data_handle = find_dissector("data");
/* Register this protocol as an ecapsulation type. */
dissector_add("wtap_encap", WTAP_ENCAP_TZSP, tzsp_handle);
encap_dissector_table = find_dissector_table("wtap_encap");
}
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