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