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/* packet-bpq.c
*
* Routines for Amateur Packet Radio protocol dissection
* Copyright 2005,2006,2007,2008,2009,2010,2012 R.W. Stearn <richard@rns-stearn.demon.co.uk>
*
* Wireshark - Network traffic analyzer
* By Gerald Combs <gerald@wireshark.org>
* Copyright 1998 Gerald Combs
*
* SPDX-License-Identifier: GPL-2.0-or-later
*/
/*
* This dissector is for:
* Ethernet encapsulated Amateur AX.25 (AX.25 over Ethernet)
*
* Information was drawn from:
* ?
*
* It uses Ether ID 0x08ff which is not officially registered.
*
*/
#include "config.h"
#include <epan/packet.h>
#include <epan/etypes.h>
#include <epan/capture_dissectors.h>
#define STRLEN 80
#define BPQ_HEADER_SIZE 2 /* length of bpq_len */
void proto_register_bpq(void);
void proto_reg_handoff_bpq(void);
static dissector_handle_t bpq_handle;
static dissector_handle_t ax25_handle;
static capture_dissector_handle_t ax25_cap_handle;
static int proto_bpq = -1;
static int hf_bpq_len = -1;
static gint ett_bpq = -1;
static int
dissect_bpq( tvbuff_t *tvb, packet_info *pinfo, proto_tree *parent_tree, void* data _U_ )
{
proto_item *ti;
proto_tree *bpq_tree;
int offset;
guint16 bpq_len;
tvbuff_t *next_tvb;
col_set_str( pinfo->cinfo, COL_PROTOCOL, "BPQ" );
col_clear( pinfo->cinfo, COL_INFO );
/* protocol offset for the BPQ header */
offset = 0;
bpq_len = tvb_get_letohs( tvb, offset );
col_add_fstr( pinfo->cinfo, COL_INFO, "%u", bpq_len );
if ( parent_tree )
{
/* protocol offset for the BPQ header */
offset = 0;
/* create display subtree for the protocol */
ti = proto_tree_add_protocol_format( parent_tree, proto_bpq, tvb, offset, BPQ_HEADER_SIZE,
"BPQ, Len: %u",
bpq_len & 0xfff /* XXX - lower 12 bits? */
);
bpq_tree = proto_item_add_subtree( ti, ett_bpq );
proto_tree_add_item( bpq_tree, hf_bpq_len, tvb, offset, BPQ_HEADER_SIZE, ENC_LITTLE_ENDIAN );
}
offset += BPQ_HEADER_SIZE;
/* XXX - use the length */
next_tvb = tvb_new_subset_remaining( tvb, offset );
call_dissector( ax25_handle, next_tvb, pinfo, parent_tree );
return tvb_captured_length(tvb);
}
static gboolean
capture_bpq( const guchar *pd, int offset, int len, capture_packet_info_t *cpinfo, const union wtap_pseudo_header *pseudo_header)
{
int l_offset;
if ( ! BYTES_ARE_IN_FRAME( offset, len, BPQ_HEADER_SIZE ) )
return FALSE;
l_offset = offset;
l_offset += BPQ_HEADER_SIZE; /* step over bpq header to point at the AX.25 packet*/
return call_capture_dissector( ax25_cap_handle, pd, l_offset, len, cpinfo, pseudo_header );
}
void
proto_register_bpq(void)
{
/* Setup list of header fields */
static hf_register_info hf[] = {
{ &hf_bpq_len,
{ "BPQ len", "bpq.len",
FT_UINT16, BASE_DEC, NULL, 0x0,
NULL, HFILL }
},
};
/* Setup protocol subtree array */
static gint *ett[] = {
&ett_bpq,
};
/* Register the protocol name and description */
proto_bpq = proto_register_protocol( "Amateur Radio BPQ", "BPQ", "bpq" );
/* Register the dissector */
bpq_handle = register_dissector("bpq", dissect_bpq, proto_bpq);
/* Required function calls to register the header fields and subtrees used */
proto_register_field_array( proto_bpq, hf, array_length( hf ) );
proto_register_subtree_array( ett, array_length( ett ) );
}
void
proto_reg_handoff_bpq(void)
{
capture_dissector_handle_t bpq_cap_handle;
dissector_add_uint("ethertype", ETHERTYPE_BPQ, bpq_handle);
bpq_cap_handle = create_capture_dissector_handle(capture_bpq, proto_bpq);
capture_dissector_add_uint("ethertype", ETHERTYPE_BPQ, bpq_cap_handle);
/* BPQ is only implemented for AX.25 */
ax25_handle = find_dissector_add_dependency( "ax25", proto_bpq );
ax25_cap_handle = find_capture_dissector( "ax25" );
}
/*
* Editor modelines - https://www.wireshark.org/tools/modelines.html
*
* Local variables:
* c-basic-offset: 8
* tab-width: 8
* indent-tabs-mode: t
* End:
*
* vi: set shiftwidth=8 tabstop=8 noexpandtab:
* :indentSize=8:tabSize=8:noTabs=false:
*/
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