asn1/goose/packet-goose-template.c

   1 /* packet-goose.c
   2  * Routines for IEC 61850 GOOSE packet dissection
   3  * Martin Lutz 2008
   4  *
   5  * $Id$
   6  *
   7  * Wireshark - Network traffic analyzer
   8  * By Gerald Combs <gerald@wireshark.org>
   9  * Copyright 1998 Gerald Combs
  10  *
  11  * This program is free software; you can redistribute it and/or
  12  * modify it under the terms of the GNU General Public License
  13  * as published by the Free Software Foundation; either version 2
  14  * of the License, or (at your option) any later version.
  15  *
  16  * This program is distributed in the hope that it will be useful,
  17  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  18  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  19  * GNU General Public License for more details.
  20  *
  21  * You should have received a copy of the GNU General Public License
  22  * along with this program; if not, write to the Free Software
  23  * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA  02111-1307, USA.
  24  */
  25
  26 #ifdef HAVE_CONFIG_H
  27 # include "config.h"
  28 #endif
  29
  30 #include <glib.h>
  31 #include <epan/packet.h>
  32 #include <epan/asn1.h>
  33 #include <epan/etypes.h>
  34 #include <epan/expert.h>
  35 #include <epan/nstime.h>
  36
  37 #include "packet-ber.h"
  38 #include "packet-acse.h"
  39
  40 #define PNAME  "GOOSE"
  41 #define PSNAME "GOOSE"
  42 #define PFNAME "goose"
  43
  44 /* Initialize the protocol and registered fields */
  45 static int proto_goose = -1;
  46 static int hf_goose_appid = -1;
  47 static int hf_goose_length = -1;
  48 static int hf_goose_reserve1 = -1;
  49 static int hf_goose_reserve2 = -1;
  50
  51 #include "packet-goose-hf.c"
  52
  53 /* Initialize the subtree pointers */
  54 static int ett_goose = -1;
  55
  56 #include "packet-goose-ett.c"
  57
  58 #include "packet-goose-fn.c"
  59
  60 /*
  61 * Dissect GOOSE PDUs inside a PPDU.
  62 */
  63 static void
  64 dissect_goose(tvbuff_t *tvb, packet_info *pinfo, proto_tree *parent_tree)
  65 {
  66         int offset = 0;
  67         int old_offset;
  68         guint16 length;
  69         proto_item *item = NULL;
  70         proto_tree *tree = NULL;
  71         asn1_ctx_t asn1_ctx;
  72         asn1_ctx_init(&asn1_ctx, ASN1_ENC_BER, TRUE, pinfo);
  73
  74         col_set_str(pinfo->cinfo, COL_PROTOCOL, PNAME);
  75         col_clear(pinfo->cinfo, COL_INFO);
  76
  77         if (parent_tree){
  78                 item = proto_tree_add_item(parent_tree, proto_goose, tvb, 0, -1, ENC_NA);
  79                 tree = proto_item_add_subtree(item, ett_goose);
  80
  81
  82                 /* APPID */
  83                 proto_tree_add_item(tree, hf_goose_appid, tvb, offset, 2, ENC_BIG_ENDIAN);
  84
  85                 /* Length */
  86                 length = tvb_get_ntohs(tvb, offset + 2);
  87                 proto_tree_add_item(tree, hf_goose_length, tvb, offset + 2, 2, ENC_BIG_ENDIAN);
  88
  89                 /* Reserved 1 */
  90                 proto_tree_add_item(tree, hf_goose_reserve1, tvb, offset + 4, 2, ENC_BIG_ENDIAN);
  91
  92                 /* Reserved 2 */
  93                 proto_tree_add_item(tree, hf_goose_reserve2, tvb, offset + 6, 2, ENC_BIG_ENDIAN);
  94
  95                 offset = 8;
  96                 while (offset < length){
  97                         old_offset = offset;
  98                         offset = dissect_goose_GOOSEpdu(FALSE, tvb, offset, &asn1_ctx , tree, -1);
  99                         if (offset == old_offset) {
 100                                 proto_tree_add_text(tree, tvb, offset, -1, "Internal error, zero-byte GOOSE PDU");
 101                                 return;
 102                         }
 103                 }
 104         }
 105 }
 106
 107
 108 /*--- proto_register_goose -------------------------------------------*/
 109 void proto_register_goose(void) {
 110
 111   /* List of fields */
 112   static hf_register_info hf[] =
 113   {
 114         { &hf_goose_appid,
 115         { "APPID",      "goose.appid", FT_UINT16, BASE_HEX_DEC, NULL, 0x0, NULL, HFILL }},
 116
 117         { &hf_goose_length,
 118         { "Length",     "goose.length", FT_UINT16, BASE_DEC, NULL, 0x0, NULL, HFILL }},
 119
 120         { &hf_goose_reserve1,
 121         { "Reserved 1", "goose.reserve1", FT_UINT16, BASE_HEX_DEC, NULL, 0x0, NULL, HFILL }},
 122
 123         { &hf_goose_reserve2,
 124         { "Reserved 2", "goose.reserve2", FT_UINT16, BASE_HEX_DEC, NULL, 0x0, NULL, HFILL }},
 125
 126 #include "packet-goose-hfarr.c"
 127   };
 128
 129   /* List of subtrees */
 130   static gint *ett[] = {
 131           &ett_goose,
 132 #include "packet-goose-ettarr.c"
 133   };
 134
 135         /* Register protocol */
 136         proto_goose = proto_register_protocol(PNAME, PSNAME, PFNAME);
 137         register_dissector("goose", dissect_goose, proto_goose);
 138
 139         /* Register fields and subtrees */
 140         proto_register_field_array(proto_goose, hf, array_length(hf));
 141         proto_register_subtree_array(ett, array_length(ett));
 142
 143 }
 144
 145 /*--- proto_reg_handoff_goose --- */
 146 void proto_reg_handoff_goose(void) {
 147
 148         dissector_handle_t goose_handle;
 149         goose_handle = find_dissector("goose");
 150
 151         dissector_add_uint("ethertype", ETHERTYPE_IEC61850_GOOSE, goose_handle);
 152 }