161 lines
3.9 KiB
C
161 lines
3.9 KiB
C
/* 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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* Wireshark - Network traffic analyzer
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* By Gerald Combs <gerald@wireshark.org>
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* Copyright 1998 Gerald Combs
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*
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* SPDX-License-Identifier: GPL-2.0-or-later
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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 officially registered.
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*
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*/
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#include "config.h"
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#include <epan/packet.h>
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#include <epan/etypes.h>
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#include <epan/capture_dissectors.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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void proto_register_bpq(void);
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void proto_reg_handoff_bpq(void);
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static dissector_handle_t bpq_handle;
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static dissector_handle_t ax25_handle;
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static capture_dissector_handle_t ax25_cap_handle;
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static int proto_bpq = -1;
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static int hf_bpq_len = -1;
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static gint ett_bpq = -1;
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static int
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dissect_bpq( tvbuff_t *tvb, packet_info *pinfo, proto_tree *parent_tree, void* data _U_ )
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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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tvbuff_t *next_tvb;
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col_set_str( pinfo->cinfo, COL_PROTOCOL, "BPQ" );
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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, ENC_LITTLE_ENDIAN );
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}
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offset += BPQ_HEADER_SIZE;
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/* XXX - use the length */
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next_tvb = tvb_new_subset_remaining( tvb, offset );
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call_dissector( ax25_handle, next_tvb, pinfo, parent_tree );
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return tvb_captured_length(tvb);
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}
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static gboolean
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capture_bpq( const guchar *pd, int offset, int len, capture_packet_info_t *cpinfo, const union wtap_pseudo_header *pseudo_header)
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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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return FALSE;
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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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return call_capture_dissector( ax25_cap_handle, pd, l_offset, len, cpinfo, pseudo_header );
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}
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void
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proto_register_bpq(void)
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{
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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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FT_UINT16, BASE_DEC, NULL, 0x0,
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NULL, HFILL }
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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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bpq_handle = 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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capture_dissector_handle_t bpq_cap_handle;
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dissector_add_uint("ethertype", ETHERTYPE_BPQ, bpq_handle);
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bpq_cap_handle = create_capture_dissector_handle(capture_bpq, proto_bpq);
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capture_dissector_add_uint("ethertype", ETHERTYPE_BPQ, bpq_cap_handle);
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/* BPQ is only implemented for AX.25 */
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ax25_handle = find_dissector_add_dependency( "ax25", proto_bpq );
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ax25_cap_handle = find_capture_dissector( "ax25" );
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}
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/*
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* Editor modelines - https://www.wireshark.org/tools/modelines.html
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*
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* Local variables:
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* c-basic-offset: 8
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* tab-width: 8
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* indent-tabs-mode: t
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* End:
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*
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* vi: set shiftwidth=8 tabstop=8 noexpandtab:
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* :indentSize=8:tabSize=8:noTabs=false:
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*/
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