forked from osmocom/wireshark
159 lines
4.4 KiB
C
159 lines
4.4 KiB
C
/* packet-goose.c
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* Routines for IEC 61850 GOOSE packet dissection
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* Martin Lutz 2008
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*
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* $Id$
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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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* 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., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
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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 <glib.h>
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#include <epan/packet.h>
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#include <epan/asn1.h>
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#include <epan/etypes.h>
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#include <epan/expert.h>
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#include <epan/nstime.h>
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#include "packet-ber.h"
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#include "packet-acse.h"
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#define PNAME "GOOSE"
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#define PSNAME "GOOSE"
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#define PFNAME "goose"
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/* Initialize the protocol and registered fields */
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static int proto_goose = -1;
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static int hf_goose_appid = -1;
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static int hf_goose_length = -1;
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static int hf_goose_reserve1 = -1;
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static int hf_goose_reserve2 = -1;
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#include "packet-goose-hf.c"
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/* Initialize the subtree pointers */
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static int ett_goose = -1;
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#include "packet-goose-ett.c"
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#include "packet-goose-fn.c"
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/*
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* Dissect GOOSE PDUs inside a PPDU.
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*/
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static void
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dissect_goose(tvbuff_t *tvb, packet_info *pinfo, proto_tree *parent_tree)
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{
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int offset = 0;
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int old_offset;
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guint16 data;
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proto_item *item = NULL;
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proto_tree *tree = NULL;
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asn1_ctx_t asn1_ctx;
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asn1_ctx_init(&asn1_ctx, ASN1_ENC_BER, TRUE, pinfo);
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if (parent_tree){
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item = proto_tree_add_item(parent_tree, proto_goose, tvb, 0, -1, FALSE);
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tree = proto_item_add_subtree(item, ett_goose);
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}
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col_set_str(pinfo->cinfo, COL_PROTOCOL, PNAME);
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col_clear(pinfo->cinfo, COL_INFO);
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/* APPID */
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if (tree && tvb_reported_length_remaining(tvb, offset) >= 2) {
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data = tvb_get_ntohs(tvb, offset);
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proto_tree_add_uint(tree, hf_goose_appid, tvb, offset, 2, data);
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}
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/* Length */
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if (tree && tvb_reported_length_remaining(tvb, offset) >= 4) {
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data = tvb_get_ntohs(tvb, offset + 2);
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proto_tree_add_uint(tree, hf_goose_length, tvb, offset + 2, 2, data);
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}
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/* Reserved 1 */
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if (tree && tvb_reported_length_remaining(tvb, offset) >= 6) {
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data = tvb_get_ntohs(tvb, offset + 4);
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proto_tree_add_uint(tree, hf_goose_reserve1, tvb, offset + 4, 2, data);
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}
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/* Reserved 2 */
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if (tree && tvb_reported_length_remaining(tvb, offset) >= 8) {
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data = tvb_get_ntohs(tvb, offset + 6);
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proto_tree_add_uint(tree, hf_goose_reserve2, tvb, offset + 6, 2, data);
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}
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offset = 8;
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while (tree && tvb_reported_length_remaining(tvb, offset) > 0){
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old_offset = offset;
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offset = dissect_goose_GOOSEpdu(FALSE, tvb, offset, &asn1_ctx , tree, -1);
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if (offset == old_offset) {
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proto_tree_add_text(tree, tvb, offset, -1, "Internal error, zero-byte GOOSE PDU");
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break;
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}
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}
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}
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/*--- proto_register_goose -------------------------------------------*/
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void proto_register_goose(void) {
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/* List of fields */
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static hf_register_info hf[] =
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{
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{ &hf_goose_appid,
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{ "APPID", "goose.appid", FT_UINT16, BASE_HEX_DEC, NULL, 0x0, NULL, HFILL }},
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{ &hf_goose_length,
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{ "Length", "goose.length", FT_UINT16, BASE_DEC, NULL, 0x0, NULL, HFILL }},
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{ &hf_goose_reserve1,
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{ "Reserved 1", "goose.reserve1", FT_UINT16, BASE_HEX_DEC, NULL, 0x0, NULL, HFILL }},
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{ &hf_goose_reserve2,
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{ "Reserved 2", "goose.reserve2", FT_UINT16, BASE_HEX_DEC, NULL, 0x0, NULL, HFILL }},
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#include "packet-goose-hfarr.c"
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};
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/* List of subtrees */
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static gint *ett[] = {
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&ett_goose,
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#include "packet-goose-ettarr.c"
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};
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/* Register protocol */
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proto_goose = proto_register_protocol(PNAME, PSNAME, PFNAME);
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register_dissector("goose", dissect_goose, proto_goose);
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/* Register fields and subtrees */
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proto_register_field_array(proto_goose, hf, array_length(hf));
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proto_register_subtree_array(ett, array_length(ett));
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}
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/*--- proto_reg_handoff_goose --- */
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void proto_reg_handoff_goose(void) {
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dissector_handle_t goose_handle;
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goose_handle = find_dissector("goose");
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dissector_add_uint("ethertype", ETHERTYPE_IEC61850_GOOSE, goose_handle);
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}
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