140 lines
3.5 KiB
C
140 lines
3.5 KiB
C
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/* packet-cgmp.c
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* Routines for the disassembly of the Cisco Group Management Protocol
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*
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* $Id: packet-cgmp.c,v 1.1 2000/02/05 05:54:15 guy Exp $
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*
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* Ethereal - Network traffic analyzer
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* By Gerald Combs <gerald@zing.org>
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* Copyright 1998 Gerald Combs
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*
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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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#include "config.h"
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#ifdef HAVE_SYS_TYPES_H
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#include <sys/types.h>
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#endif
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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 "packet.h"
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/*
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* See
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*
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* http://www.barnett.sk/software/bbooks/cisco_multicasting_routing/chap04.html
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*
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* for some information on CGMP.
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*/
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static int proto_cgmp = -1;
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static int hf_cgmp_version = -1;
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static int hf_cgmp_type = -1;
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static int hf_cgmp_count = -1;
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static int hf_cgmp_gda = -1;
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static int hf_cgmp_usa = -1;
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static gint ett_cgmp = -1;
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static const value_string type_vals[] = {
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{ 0, "Join" },
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{ 1, "Leave" },
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{ 0, NULL },
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};
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void
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dissect_cgmp(const u_char *pd, int offset, frame_data *fd, proto_tree *tree)
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{
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proto_item *ti;
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proto_tree *cgmp_tree = NULL;
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guint8 count;
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if (check_col(fd, COL_PROTOCOL))
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col_add_str(fd, COL_PROTOCOL, "CGMP");
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if (check_col(fd, COL_INFO))
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col_add_str(fd, COL_INFO, "Cisco Group Management Protocol");
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if (tree) {
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ti = proto_tree_add_item(tree, proto_cgmp, offset, END_OF_FRAME, NULL);
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cgmp_tree = proto_item_add_subtree(ti, ett_cgmp);
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proto_tree_add_item(cgmp_tree, hf_cgmp_version, offset, 1,
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pd[offset]);
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proto_tree_add_item(cgmp_tree, hf_cgmp_type, offset, 1,
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pd[offset]);
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offset += 1;
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offset += 2; /* skip reserved field */
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count = pd[offset];
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proto_tree_add_item(cgmp_tree, hf_cgmp_count, offset, 1,
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count);
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offset += 1;
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while (count != 0) {
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if (!BYTES_ARE_IN_FRAME(offset, 6))
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break;
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proto_tree_add_item(cgmp_tree, hf_cgmp_gda, offset, 6,
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&pd[offset]);
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offset += 6;
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if (!BYTES_ARE_IN_FRAME(offset, 6))
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break;
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proto_tree_add_item(cgmp_tree, hf_cgmp_usa, offset, 6,
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&pd[offset]);
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offset += 6;
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count--;
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}
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}
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}
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void
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proto_register_cgmp(void)
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{
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static hf_register_info hf[] = {
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{ &hf_cgmp_version,
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{ "Version", "cgmp.version", FT_UINT8, BASE_DEC, NULL, 0xF0,
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"" }},
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{ &hf_cgmp_type,
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{ "Type", "cgmp.type", FT_UINT8, BASE_DEC, VALS(type_vals), 0x0F,
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"" }},
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{ &hf_cgmp_count,
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{ "Count", "cgmp.count", FT_UINT8, BASE_DEC, NULL, 0x0,
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"" }},
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{ &hf_cgmp_gda,
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{ "Group Destination Address", "cgmp.gda", FT_ETHER, BASE_NONE, NULL, 0x0,
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"Group Destination Address" }},
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{ &hf_cgmp_usa,
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{ "Unicast Source Address", "cgmp.usa", FT_ETHER, BASE_NONE, NULL, 0x0,
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"Unicast Source Address" }},
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};
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static gint *ett[] = {
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&ett_cgmp,
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};
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proto_cgmp = proto_register_protocol("Cisco Group Management Protocol", "cgmp");
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proto_register_field_array(proto_cgmp, hf, array_length(hf));
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proto_register_subtree_array(ett, array_length(ett));
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}
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