2012-08-02 23:55:42 +00:00
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/* packet-bpq.c
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*
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* Routines for Amateur Packet Radio protocol dissection
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* Copyright 2005,2006,2007,2008,2009,2010,2012 R.W. Stearn <richard@rns-stearn.demon.co.uk>
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*
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* $Id$
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*
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* Ethereal - Network traffic analyzer
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* By Gerald Combs <gerald@ethereal.com>
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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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2012-08-03 14:46:12 +00:00
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*
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2012-08-02 23:55:42 +00:00
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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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2012-08-03 14:46:12 +00:00
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*
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2012-08-02 23:55:42 +00:00
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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., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
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*/
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/*
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* This dissector is for:
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* Ethernet encapsulated Amateur AX.25 (AX.25 over Ethernet)
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*
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* Information was drawn from:
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* ?
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*
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* It uses Ether ID 0x08ff which is not not officially registered.
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*
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*/
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#ifdef HAVE_CONFIG_H
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# include "config.h"
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#endif
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#include <stdio.h>
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#include <stdlib.h>
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#include <string.h>
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#include <glib.h>
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#include <epan/strutil.h>
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#include <epan/packet.h>
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#include <epan/prefs.h>
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#include <epan/emem.h>
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#include <epan/etypes.h>
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#include "packet-bpq.h"
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#include "packet-ax25.h"
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#define STRLEN 80
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#define BPQ_HEADER_SIZE 2 /* length of bpq_len */
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/* Forward declaration we need below */
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void proto_reg_handoff_bpq(void);
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/* Dissector handles - all the possibles are listed */
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static dissector_handle_t ax25_handle;
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/* Initialize the protocol and registered fields */
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static int proto_bpq = -1;
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static int hf_bpq_len = -1;
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/* Initialize the subtree pointers */
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static gint ett_bpq = -1;
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/* Code to actually dissect the packets */
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static void
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dissect_bpq( tvbuff_t *tvb, packet_info *pinfo, proto_tree *parent_tree )
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{
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proto_item *ti;
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proto_tree *bpq_tree;
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int offset;
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guint16 bpq_len;
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void *saved_private_data;
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tvbuff_t *next_tvb = NULL;
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col_set_str( pinfo->cinfo, COL_PROTOCOL, "BPQ" );
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2012-08-03 14:46:12 +00:00
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2012-08-02 23:55:42 +00:00
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col_clear( pinfo->cinfo, COL_INFO );
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/* protocol offset for the BPQ header */
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offset = 0;
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bpq_len = tvb_get_letohs( tvb, offset );
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col_add_fstr( pinfo->cinfo, COL_INFO, "%u", bpq_len );
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if ( parent_tree )
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{
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/* protocol offset for the BPQ header */
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offset = 0;
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/* create display subtree for the protocol */
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ti = proto_tree_add_protocol_format( parent_tree, proto_bpq, tvb, offset, BPQ_HEADER_SIZE,
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"BPQ, Len: %u",
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bpq_len & 0xfff /* XXX - lower 12 bits? */
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);
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bpq_tree = proto_item_add_subtree( ti, ett_bpq );
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proto_tree_add_item( bpq_tree, hf_bpq_len, tvb, offset, BPQ_HEADER_SIZE, TRUE );
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}
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/* Call sub-dissectors here */
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offset += BPQ_HEADER_SIZE;
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saved_private_data = pinfo->private_data;
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/* XXX - use the length */
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next_tvb = tvb_new_subset( tvb, offset, -1, -1 );
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call_dissector( ax25_handle, next_tvb, pinfo, parent_tree );
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pinfo->private_data = saved_private_data;
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}
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void
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proto_register_bpq(void)
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2012-08-03 14:46:12 +00:00
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{
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2012-08-02 23:55:42 +00:00
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/* Setup list of header fields */
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static hf_register_info hf[] = {
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{ &hf_bpq_len,
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{ "BPQ len", "bpq.len",
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2012-08-03 14:46:12 +00:00
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FT_UINT16, BASE_DEC, NULL, 0x0,
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NULL, HFILL }
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2012-08-02 23:55:42 +00:00
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},
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};
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/* Setup protocol subtree array */
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static gint *ett[] = {
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&ett_bpq,
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};
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/* Register the protocol name and description */
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proto_bpq = proto_register_protocol( "Amateur Radio BPQ", "BPQ", "bpq" );
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/* Register the dissector */
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register_dissector( "bpq", dissect_bpq, proto_bpq );
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/* Required function calls to register the header fields and subtrees used */
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proto_register_field_array( proto_bpq, 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_bpq(void)
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{
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static gboolean inited = FALSE;
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2012-08-03 14:46:12 +00:00
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if(!inited) {
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2012-08-02 23:55:42 +00:00
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dissector_handle_t bpq_handle;
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bpq_handle = create_dissector_handle( dissect_bpq, proto_bpq );
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2012-08-03 14:46:12 +00:00
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dissector_add_uint("ethertype", ETHERTYPE_BPQ, bpq_handle);
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2012-08-02 23:55:42 +00:00
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/* BPQ is only implemented for AX.25 */
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ax25_handle = find_dissector( "ax25" );
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inited = TRUE;
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}
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}
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void
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capture_bpq( const guchar *pd, int offset, int len, packet_counts *ld)
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{
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int l_offset;
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if ( ! BYTES_ARE_IN_FRAME( offset, len, BPQ_HEADER_SIZE ) )
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{
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ld->other++;
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return;
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}
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l_offset = offset;
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l_offset += BPQ_HEADER_SIZE; /* step over bpq header to point at the AX.25 packet*/
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capture_ax25( pd, l_offset, len, ld );
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}
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