forked from osmocom/wireshark
149 lines
4.2 KiB
C
149 lines
4.2 KiB
C
/* packet-bofl.c
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* Routines for Wellfleet BOFL dissection
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* Author: Endoh Akira (endoh@netmarks.co.jp)
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*
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* Wireshark - Network traffic analyzer
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* By Gerald Combs <gerald@unicom.net>
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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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* The following information was copied from
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* http://www.protocols.com/pbook/bridge.htm#WellfleetBOFL
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*
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* The Wellfleet Breath of Life (BOFL) protocol is used as a line sensing
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* protocol on:
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*
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* - Ethernet LANs to detect transmitter jams.
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* - Synchronous lines running WFLT STD protocols to determine if the line
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* is up.
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* - Dial backup PPP lines.
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*
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* The frame format of Wellfleet BOFL is shown following the Ethernet header
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* in the following illustration:
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*
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* Destination Source 8102 PDU Sequence Padding
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* 6 6 2 4 4 n bytes
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*/
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#include "config.h"
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#include <epan/packet.h>
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#define ETHER_TYPE_BOFL 0x8102
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#define BOFL_MIN_LEN 8
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void proto_register_bofl(void);
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void proto_reg_handoff_bofl(void);
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/* Initialize the protocol and registered fields */
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static int proto_bofl = -1;
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static int hf_bofl_pdu = -1;
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static int hf_bofl_sequence = -1;
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static int hf_bofl_padding = -1;
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/* Initialize the subtree pointers */
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static gint ett_bofl = -1;
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/* Code to actually dissect the packets */
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static int
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dissect_bofl(tvbuff_t *tvb, packet_info *pinfo, proto_tree *tree, void* data _U_)
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{
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proto_item *ti;
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proto_tree *bofl_tree;
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gint len;
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guint32 pdu, sequence;
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col_set_str(pinfo->cinfo, COL_PROTOCOL, "BOFL");
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col_clear(pinfo->cinfo, COL_INFO);
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ti = proto_tree_add_item(tree, proto_bofl, tvb, 0, -1, ENC_NA);
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bofl_tree = proto_item_add_subtree(ti, ett_bofl);
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pdu = tvb_get_ntohl(tvb, 0);
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col_add_fstr(pinfo->cinfo, COL_INFO,
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"PDU: 0x%08x", pdu);
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proto_tree_add_uint(bofl_tree, hf_bofl_pdu, tvb, 0, 4, pdu);
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sequence = tvb_get_ntohl(tvb, 4);
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col_append_fstr(pinfo->cinfo, COL_INFO,
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" Sequence: %u", sequence);
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proto_tree_add_uint(bofl_tree, hf_bofl_sequence, tvb, 4, 4, sequence);
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len = tvb_reported_length_remaining(tvb, 8);
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if (len > 0)
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proto_tree_add_item(bofl_tree, hf_bofl_padding, tvb, 8, -1, ENC_NA);
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return tvb_captured_length(tvb);
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}
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void
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proto_register_bofl(void)
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{
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static hf_register_info hf[] = {
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{ &hf_bofl_pdu,
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{ "PDU", "bofl.pdu",
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FT_UINT32, BASE_HEX, NULL, 0,
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"PDU; normally equals 0x01010000 or 0x01011111", HFILL }
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},
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{ &hf_bofl_sequence,
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{ "Sequence", "bofl.sequence",
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FT_UINT32, BASE_DEC, NULL, 0,
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"incremental counter", HFILL }
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},
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{ &hf_bofl_padding,
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{ "Padding", "bofl.padding",
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FT_BYTES, BASE_NONE, NULL, 0,
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NULL, HFILL }
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}
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};
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static gint *ett[] = {
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&ett_bofl,
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};
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proto_bofl = proto_register_protocol("Wellfleet Breath of Life",
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"BOFL", "bofl");
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proto_register_field_array(proto_bofl, 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_bofl(void)
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{
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dissector_handle_t bofl_handle;
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bofl_handle = create_dissector_handle(dissect_bofl, proto_bofl);
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dissector_add_uint("ethertype", ETHER_TYPE_BOFL, bofl_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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