forked from osmocom/wireshark
144 lines
3.7 KiB
C
144 lines
3.7 KiB
C
/* packet-cgmp.c
|
|
* Routines for the disassembly of the Cisco Group Management Protocol
|
|
*
|
|
* $Id: packet-cgmp.c,v 1.17 2002/08/28 21:00:08 jmayer Exp $
|
|
*
|
|
* Ethereal - Network traffic analyzer
|
|
* By Gerald Combs <gerald@ethereal.com>
|
|
* Copyright 1998 Gerald Combs
|
|
*
|
|
* This program is free software; you can redistribute it and/or
|
|
* modify it under the terms of the GNU General Public License
|
|
* as published by the Free Software Foundation; either version 2
|
|
* of the License, or (at your option) any later version.
|
|
*
|
|
* This program is distributed in the hope that it will be useful,
|
|
* but WITHOUT ANY WARRANTY; without even the implied warranty of
|
|
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
|
|
* GNU General Public License for more details.
|
|
*
|
|
* You should have received a copy of the GNU General Public License
|
|
* along with this program; if not, write to the Free Software
|
|
* Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
|
|
*/
|
|
|
|
#include "config.h"
|
|
|
|
#include <stdlib.h>
|
|
#include <string.h>
|
|
|
|
#include <glib.h>
|
|
#include <epan/packet.h>
|
|
|
|
/*
|
|
* See
|
|
*
|
|
* http://www.barnett.sk/software/bbooks/cisco_multicasting_routing/chap04.html
|
|
*
|
|
* for some information on CGMP.
|
|
*/
|
|
|
|
static int proto_cgmp = -1;
|
|
static int hf_cgmp_version = -1;
|
|
static int hf_cgmp_type = -1;
|
|
static int hf_cgmp_count = -1;
|
|
static int hf_cgmp_gda = -1;
|
|
static int hf_cgmp_usa = -1;
|
|
|
|
static gint ett_cgmp = -1;
|
|
|
|
static const value_string type_vals[] = {
|
|
{ 0, "Join" },
|
|
{ 1, "Leave" },
|
|
{ 0, NULL },
|
|
};
|
|
|
|
static void
|
|
dissect_cgmp(tvbuff_t *tvb, packet_info *pinfo, proto_tree *tree)
|
|
{
|
|
proto_item *ti;
|
|
proto_tree *cgmp_tree = NULL;
|
|
int offset = 0;
|
|
guint8 count;
|
|
|
|
if (check_col(pinfo->cinfo, COL_PROTOCOL))
|
|
col_set_str(pinfo->cinfo, COL_PROTOCOL, "CGMP");
|
|
if (check_col(pinfo->cinfo, COL_INFO))
|
|
col_set_str(pinfo->cinfo, COL_INFO, "Cisco Group Management Protocol");
|
|
|
|
if (tree) {
|
|
ti = proto_tree_add_item(tree, proto_cgmp, tvb, offset, -1,
|
|
FALSE);
|
|
cgmp_tree = proto_item_add_subtree(ti, ett_cgmp);
|
|
|
|
proto_tree_add_item(cgmp_tree, hf_cgmp_version, tvb, offset, 1,
|
|
FALSE);
|
|
proto_tree_add_item(cgmp_tree, hf_cgmp_type, tvb, offset, 1,
|
|
FALSE);
|
|
offset += 1;
|
|
|
|
offset += 2; /* skip reserved field */
|
|
|
|
count = tvb_get_guint8(tvb, offset);
|
|
proto_tree_add_uint(cgmp_tree, hf_cgmp_count, tvb, offset, 1,
|
|
count);
|
|
offset += 1;
|
|
|
|
while (count != 0) {
|
|
proto_tree_add_item(cgmp_tree, hf_cgmp_gda, tvb, offset, 6,
|
|
FALSE);
|
|
offset += 6;
|
|
|
|
proto_tree_add_item(cgmp_tree, hf_cgmp_usa, tvb, offset, 6,
|
|
FALSE);
|
|
offset += 6;
|
|
|
|
count--;
|
|
}
|
|
}
|
|
}
|
|
|
|
void
|
|
proto_register_cgmp(void)
|
|
{
|
|
static hf_register_info hf[] = {
|
|
{ &hf_cgmp_version,
|
|
{ "Version", "cgmp.version", FT_UINT8, BASE_DEC, NULL, 0xF0,
|
|
"", HFILL }},
|
|
|
|
{ &hf_cgmp_type,
|
|
{ "Type", "cgmp.type", FT_UINT8, BASE_DEC, VALS(type_vals), 0x0F,
|
|
"", HFILL }},
|
|
|
|
{ &hf_cgmp_count,
|
|
{ "Count", "cgmp.count", FT_UINT8, BASE_DEC, NULL, 0x0,
|
|
"", HFILL }},
|
|
|
|
{ &hf_cgmp_gda,
|
|
{ "Group Destination Address", "cgmp.gda", FT_ETHER, BASE_NONE, NULL, 0x0,
|
|
"Group Destination Address", HFILL }},
|
|
|
|
{ &hf_cgmp_usa,
|
|
{ "Unicast Source Address", "cgmp.usa", FT_ETHER, BASE_NONE, NULL, 0x0,
|
|
"Unicast Source Address", HFILL }},
|
|
};
|
|
static gint *ett[] = {
|
|
&ett_cgmp,
|
|
};
|
|
|
|
proto_cgmp = proto_register_protocol("Cisco Group Management Protocol",
|
|
"CGMP", "cgmp");
|
|
proto_register_field_array(proto_cgmp, hf, array_length(hf));
|
|
proto_register_subtree_array(ett, array_length(ett));
|
|
}
|
|
|
|
void
|
|
proto_reg_handoff_cgmp(void)
|
|
{
|
|
dissector_handle_t cgmp_handle;
|
|
|
|
cgmp_handle = create_dissector_handle(dissect_cgmp, proto_cgmp);
|
|
dissector_add("llc.cisco_pid", 0x2001, cgmp_handle);
|
|
dissector_add("ethertype", 0x2001, cgmp_handle);
|
|
}
|