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/* packet-rgmp.c
* Routines for IGMP/RGMP packet disassembly
* Copyright 2006 Jaap Keuter
*
* $Id$
*
* Wireshark - Network traffic analyzer
* By Gerald Combs <gerald@wireshark.org>
* 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.
*/
/*
Based on RFC3488
This is a setup for RGMP dissection, a simple protocol bolted on IGMP.
The trick is to have IGMP dissector call this function (which by itself is not
registered as dissector). IGAP and other do the same.
*/
#ifdef HAVE_CONFIG_H
# include "config.h"
#endif
#include <glib.h>
#include <epan/packet.h>
#include <epan/strutil.h>
#include "packet-igmp.h"
#include "packet-rgmp.h"
static int proto_rgmp = -1;
static int hf_type = -1;
static int hf_checksum = -1;
static int hf_checksum_bad = -1;
static int hf_maddr = -1;
static int ett_rgmp = -1;
static const value_string rgmp_types[] = {
{IGMP_RGMP_LEAVE, "Leave"},
{IGMP_RGMP_JOIN, "Join"},
{IGMP_RGMP_BYE, "Bye"},
{IGMP_RGMP_HELLO, "Hello"},
{0, NULL}
};
/* This function is only called from the IGMP dissector */
int
dissect_rgmp(tvbuff_t *tvb, packet_info *pinfo, proto_tree *parent_tree, int offset)
{
proto_tree *tree;
proto_item *item;
guint8 type;
if (!proto_is_protocol_enabled(find_protocol_by_id(proto_rgmp))) {
/* we are not enabled, skip entire packet to be nice
to the igmp layer. (so clicking on IGMP will display the data)
*/
return offset + tvb_length_remaining(tvb, offset);
}
item = proto_tree_add_item(parent_tree, proto_rgmp, tvb, offset, -1, ENC_NA);
tree = proto_item_add_subtree(item, ett_rgmp);
col_set_str(pinfo->cinfo, COL_PROTOCOL, "RGMP");
col_clear(pinfo->cinfo, COL_INFO);
type = tvb_get_guint8(tvb, offset);
if (check_col(pinfo->cinfo, COL_INFO)) {
col_add_str(pinfo->cinfo, COL_INFO,
val_to_str(type, rgmp_types, "Unknown Type: 0x%02x"));
}
proto_tree_add_uint(tree, hf_type, tvb, offset, 1, type);
offset += 1;
/* reserved */
offset += 1;
igmp_checksum(tree, tvb, hf_checksum, hf_checksum_bad, pinfo, 0);
offset += 2;
proto_tree_add_item(tree, hf_maddr, tvb, offset, 4, ENC_BIG_ENDIAN);
offset += 4;
return offset;
}
void
proto_register_rgmp(void)
{
static hf_register_info hf[] = {
{ &hf_type,
{ "Type", "rgmp.type", FT_UINT8, BASE_HEX,
VALS(rgmp_types), 0, "RGMP Packet Type", HFILL }
},
{ &hf_checksum,
{ "Checksum", "rgmp.checksum", FT_UINT16, BASE_HEX,
NULL, 0, NULL, HFILL }
},
{ &hf_checksum_bad,
{ "Bad Checksum", "rgmp.checksum_bad", FT_BOOLEAN, BASE_NONE,
NULL, 0x0, NULL, HFILL }
},
{ &hf_maddr,
{ "Multicast group address", "rgmp.maddr", FT_IPv4, BASE_NONE,
NULL, 0, NULL, HFILL }
}
};
static gint *ett[] = {
&ett_rgmp
};
proto_rgmp = proto_register_protocol
("Router-port Group Management Protocol", "RGMP", "rgmp");
proto_register_field_array(proto_rgmp, hf, array_length(hf));
proto_register_subtree_array(ett, array_length(ett));
}
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