forked from osmocom/wireshark
987244e168
Add an IBM link for SNA, they being its creators. Point to Wayback Machine archives for the protocols.com page, as that doesn't seem to be available on protocols.com any more. Change-Id: I33633c838707f13afacde7a207a06f87b9f99bbb Reviewed-on: https://code.wireshark.org/review/20219 Reviewed-by: Guy Harris <guy@alum.mit.edu>
149 lines
4.3 KiB
C
149 lines
4.3 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://web.archive.org/web/20150608035209/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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