273 lines
8.3 KiB
C
273 lines
8.3 KiB
C
/* packet-wsmp.c
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* Routines for WAVE Short Message dissection (WSMP)
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* Copyright 2013, Savari Networks (http://www.savarinetworks.com) (email: smooney@savarinetworks.com)
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* Based on packet-wsmp.c implemented by
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* Arada Systems (http://www.aradasystems.com) (email: siva@aradasystems.com)
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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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#include "config.h"
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#include <epan/packet.h>
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#include <epan/etypes.h>
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/* elemenID Types */
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#define TRANSMITPW 0x04
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#define CHANNUM 0x0F
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#define DATARATE 0x10
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#define WSMP 0x80
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#define WSMP_S 0x81
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#define WSMP_I 0x82
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void proto_register_wsmp(void);
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void proto_reg_handoff_wsmp(void);
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static const value_string wsmp_elemenid_names[] = {
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{ 0x80, "WSMP" },
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{ 0x81, "WSMP-S" },
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{ 0x82, "WSMP-I" },
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{ 0, NULL }
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};
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/* Initialize the protocol and registered fields */
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static int proto_wsmp = -1;
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static int hf_wsmp_version = -1;
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static int hf_wsmp_psid = -1;
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static int hf_wsmp_rate = -1;
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static int hf_wsmp_channel = -1;
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static int hf_wsmp_txpower = -1;
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static int hf_wsmp_WAVEid = -1;
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static int hf_wsmp_wsmlength = -1;
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static int hf_wsmp_WSMP_S_data = -1;
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/* Savari function to get the length of a psid based on the number of
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successive 1s in the most sig bits of the most sig octet. Taken
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from libwme
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*/
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static int wme_getpsidlen (guint8 *psid)
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{
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int length = 0;
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if ((psid[0] & 0xF0) == 0xF0) {
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length = 255;
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} else if ( (psid[0] & 0xF0) == 0xE0) {
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length = 4;
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} else if ( (psid[0] & 0xE0) == 0xC0) {
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length = 3;
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} else if ( (psid[0] & 0xC0) == 0x80) {
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length = 2;
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} else if ((psid[0] & 0x80) == 0x00) {
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length = 1;
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}
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return length;
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}
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/* Initialize the subtree pointers */
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static gint ett_wsmp = -1;
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static gint ett_wsmdata = -1;
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static int
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dissect_wsmp(tvbuff_t *tvb, packet_info *pinfo, proto_tree *tree, void* data _U_)
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{
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/* Set up structures needed to add the protocol subtree and manage it */
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proto_item *ti;
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proto_tree *wsmp_tree, *wsmdata_tree;
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tvbuff_t *wsmdata_tvb;
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guint16 wsmlength, offset;
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guint32 psidLen, psid, supLen;
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guint8 elemenId, elemenLen, msb;
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/* Make entries in Protocol column and Info column on summary display */
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col_set_str(pinfo->cinfo, COL_PROTOCOL, "WSMP");
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col_set_str(pinfo->cinfo, COL_INFO, "WAVE Short Message Protocol IEEE P1609.3");
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/* create display subtree for the protocol */
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ti = proto_tree_add_item(tree, proto_wsmp, tvb, 0, -1, ENC_NA);
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wsmp_tree = proto_item_add_subtree(ti, ett_wsmp);
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offset = 0;
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proto_tree_add_item(wsmp_tree,
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hf_wsmp_version, tvb, offset, 1, ENC_BIG_ENDIAN);
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offset++;
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psid = tvb_get_guint8(tvb, offset);
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psidLen = (guint32)wme_getpsidlen((guint8*)&psid);
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if (psidLen == 2)
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psid = tvb_get_ntohs(tvb, offset);
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else if (psidLen == 3)
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psid = tvb_get_ntoh24(tvb, offset);
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else if (psidLen == 4)
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psid = tvb_get_ntohl(tvb, offset);
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proto_tree_add_item(wsmp_tree,
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hf_wsmp_psid, tvb, offset, psidLen, ENC_BIG_ENDIAN);
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offset += psidLen;
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/* TLV decoder that does not display the T and L elements */
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elemenId = tvb_get_guint8(tvb, offset);
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while ((elemenId != WSMP) && (elemenId != WSMP_S) && (elemenId != WSMP_I))
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{
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offset++;
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if (elemenId == CHANNUM)
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{
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elemenLen = tvb_get_guint8(tvb, offset);
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offset++;
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proto_tree_add_item(wsmp_tree,
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hf_wsmp_channel, tvb, offset, elemenLen, ENC_BIG_ENDIAN);
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offset += elemenLen;
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}
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else if (elemenId == DATARATE)
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{
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elemenLen = tvb_get_guint8(tvb, offset);
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offset++;
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proto_tree_add_item(wsmp_tree,
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hf_wsmp_rate, tvb, offset, elemenLen, ENC_BIG_ENDIAN);
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offset += elemenLen;
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}
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else if (elemenId == TRANSMITPW)
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{
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elemenLen = tvb_get_guint8(tvb, offset);
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offset++;
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proto_tree_add_item(wsmp_tree,
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hf_wsmp_txpower, tvb, offset, elemenLen, ENC_BIG_ENDIAN);
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offset += elemenLen;
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}
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elemenId = tvb_get_guint8(tvb, offset);
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}
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proto_tree_add_item(wsmp_tree,
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hf_wsmp_WAVEid, tvb, offset, 1, ENC_BIG_ENDIAN);
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offset++;
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wsmlength = tvb_get_ntohs( tvb, offset);
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proto_tree_add_item(wsmp_tree,
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hf_wsmp_wsmlength, tvb, offset, 2, ENC_BIG_ENDIAN);
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offset += 2;
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if (elemenId == WSMP_S)
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{
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msb = 1;
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supLen = 0;
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while (msb)
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{
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msb = tvb_get_guint8(tvb, offset + supLen);
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msb = msb & 0x80;
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supLen++;
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}
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proto_tree_add_item(wsmp_tree,
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hf_wsmp_WSMP_S_data, tvb, offset, supLen, ENC_BIG_ENDIAN);
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wsmlength -= supLen;
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offset += supLen;
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}
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wsmdata_tree = proto_tree_add_subtree(wsmp_tree, tvb, offset, wsmlength,
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ett_wsmdata, NULL, "Wave Short Message");
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wsmdata_tvb = tvb_new_subset_length_caplen(tvb, offset, -1, wsmlength);
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/* TODO: Branch on the application context and display accordingly
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* Default: call the data dissector
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*/
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if (psid == 0xbff0)
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{
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call_data_dissector(wsmdata_tvb, pinfo, wsmdata_tree);
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}
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return tvb_captured_length(tvb);
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}
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void
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proto_register_wsmp(void)
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{
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static hf_register_info hf[] = {
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{ &hf_wsmp_version,
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{ "Version", "wsmp.version", FT_UINT8, BASE_DEC, NULL, 0x0,
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NULL, HFILL }},
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{ &hf_wsmp_psid,
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{ "PSID", "wsmp.psid", FT_UINT32, BASE_HEX, NULL, 0x0,
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NULL, HFILL }},
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{ &hf_wsmp_channel,
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{ "Channel", "wsmp.channel", FT_UINT8, BASE_DEC, NULL, 0x0,
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NULL, HFILL }},
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{ &hf_wsmp_rate,
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{ "Data Rate", "wsmp.rate", FT_UINT8, BASE_DEC, NULL, 0x0,
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NULL, HFILL }},
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{ &hf_wsmp_txpower,
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{ "Transmit Power", "wsmp.txpower", FT_UINT8, BASE_DEC, NULL, 0x0,
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NULL, HFILL }},
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{ &hf_wsmp_WAVEid,
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{ "WAVE element id", "wsmp.WAVEid", FT_UINT8, BASE_DEC, VALS(wsmp_elemenid_names), 0x0,
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NULL, HFILL }},
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{ &hf_wsmp_wsmlength,
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{ "WSM Length", "wsmp.wsmlength", FT_UINT16, BASE_DEC, NULL, 0x0,
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NULL, HFILL }},
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{ &hf_wsmp_WSMP_S_data,
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{ "WAVE Supplement Data", "wsmp.supplement", FT_UINT8, BASE_HEX, NULL, 0x0,
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NULL, HFILL }},
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};
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/* Setup protocol subtree array */
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static gint *ett[] = {
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&ett_wsmp,
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&ett_wsmdata,
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};
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/* Register the protocol name and description */
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proto_wsmp = proto_register_protocol("Wave Short Message Protocol(IEEE P1609.3)",
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"WSMP", "wsmp");
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/* Required function calls to register the header fields and subtrees used */
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proto_register_field_array(proto_wsmp, hf, array_length(hf));
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proto_register_subtree_array(ett, array_length(ett));
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}
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void
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proto_reg_handoff_wsmp(void)
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{
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dissector_handle_t wsmp_handle;
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wsmp_handle = create_dissector_handle(dissect_wsmp, proto_wsmp);
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dissector_add_uint("ethertype", ETHERTYPE_WSMP, wsmp_handle);
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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: 4
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* tab-width: 8
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* indent-tabs-mode: nil
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* End:
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*
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* vi: set shiftwidth=4 tabstop=8 expandtab:
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* :indentSize=4:tabSize=8:noTabs=true:
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*/
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