feab79e328
svn path=/trunk/; revision=18196
335 lines
8.1 KiB
C
335 lines
8.1 KiB
C
/* packet-msnip.c 2001 Ronnie Sahlberg <See AUTHORS for email>
|
|
* Routines for IGMP/MSNIP packet disassembly
|
|
*
|
|
* $Id$
|
|
*
|
|
* 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.
|
|
*/
|
|
/*
|
|
|
|
|
|
MSNIP
|
|
code
|
|
|
|
0x23 x
|
|
0x24 x
|
|
0x25 x
|
|
|
|
MSNIP " Multicast Source Notification of Interest Protocol
|
|
Defined in draft-ietf-idmr-igmp-msnip-00.txt
|
|
*/
|
|
|
|
#ifdef HAVE_CONFIG_H
|
|
# include "config.h"
|
|
#endif
|
|
|
|
#include <stdio.h>
|
|
#include <string.h>
|
|
#include <glib.h>
|
|
|
|
#include <epan/packet.h>
|
|
#include "packet-igmp.h"
|
|
#include "packet-msnip.h"
|
|
|
|
|
|
static int proto_msnip = -1;
|
|
static int hf_checksum = -1;
|
|
static int hf_checksum_bad = -1;
|
|
static int hf_type = -1;
|
|
static int hf_count = -1;
|
|
static int hf_holdtime = -1;
|
|
static int hf_groups = -1;
|
|
static int hf_maddr = -1;
|
|
static int hf_mask = -1;
|
|
static int hf_holdtime16 = -1;
|
|
static int hf_genid = -1;
|
|
static int hf_rec_type = -1;
|
|
|
|
static int ett_msnip = -1;
|
|
static int ett_groups = -1;
|
|
|
|
|
|
#define MSNIP_GM 0x23
|
|
#define MSNIP_IS 0x24
|
|
#define MSNIP_RMR 0x25
|
|
static const value_string msnip_types[] = {
|
|
{MSNIP_GM, "Multicast Group Map"},
|
|
{MSNIP_IS, "Multicast Interest Solicitation"},
|
|
{MSNIP_RMR, "Multicast Receiver Membership Report"},
|
|
{0, NULL}
|
|
};
|
|
|
|
#define MSNIP_RECTYPE_TRANSMIT 1
|
|
#define MSNIP_RECTYPE_HOLD 2
|
|
static const value_string msnip_rec_types[] = {
|
|
{MSNIP_RECTYPE_TRANSMIT, "Request to start transmitting group"},
|
|
{MSNIP_RECTYPE_HOLD, "Request to hold transmitting group"},
|
|
{0, NULL}
|
|
};
|
|
|
|
static int
|
|
dissect_msnip_rmr(tvbuff_t *tvb, packet_info *pinfo, proto_tree *parent_tree, int offset)
|
|
{
|
|
guint8 count;
|
|
|
|
/* group count */
|
|
count = tvb_get_guint8(tvb, offset);
|
|
proto_tree_add_uint(parent_tree, hf_count, tvb, offset, 1, count);
|
|
offset += 1;
|
|
|
|
/* checksum */
|
|
igmp_checksum(parent_tree, tvb, hf_checksum, hf_checksum_bad, pinfo, 0);
|
|
offset += 2;
|
|
|
|
while (count--) {
|
|
proto_tree *tree;
|
|
proto_item *item;
|
|
guint8 rec_type;
|
|
guint32 maddr;
|
|
int old_offset = offset;
|
|
|
|
item = proto_tree_add_item(parent_tree, hf_groups,
|
|
tvb, offset, -1, FALSE);
|
|
tree = proto_item_add_subtree(item, ett_groups);
|
|
|
|
/* record type */
|
|
rec_type = tvb_get_guint8(tvb, offset);
|
|
proto_tree_add_uint(tree, hf_rec_type, tvb, offset, 1, rec_type);
|
|
offset += 1;
|
|
|
|
/* skip 3 unused bytes */
|
|
offset += 3;
|
|
|
|
/* multicast group */
|
|
maddr = tvb_get_ipv4(tvb, offset);
|
|
proto_tree_add_ipv4(tree, hf_maddr, tvb, offset, 4,
|
|
maddr);
|
|
offset += 4;
|
|
|
|
if (item) {
|
|
proto_item_set_text(item,"Group: %s %s",
|
|
ip_to_str((guint8 *)&maddr),
|
|
val_to_str(rec_type, msnip_rec_types,
|
|
"Unknown Type:0x%02x"));
|
|
|
|
proto_item_set_len(item, offset-old_offset);
|
|
}
|
|
}
|
|
|
|
return offset;
|
|
}
|
|
|
|
static int
|
|
dissect_msnip_is(tvbuff_t *tvb, packet_info *pinfo, proto_tree *parent_tree, int offset)
|
|
{
|
|
|
|
/* skip reserved byte */
|
|
offset += 1;
|
|
|
|
/* checksum */
|
|
igmp_checksum(parent_tree, tvb, hf_checksum, hf_checksum_bad, pinfo, 0);
|
|
offset += 2;
|
|
|
|
/* 16 bit holdtime */
|
|
proto_tree_add_uint(parent_tree, hf_holdtime16, tvb, offset, 2, tvb_get_ntohs(tvb, offset));
|
|
offset += 2;
|
|
|
|
/* Generation ID */
|
|
proto_tree_add_uint(parent_tree, hf_genid, tvb, offset, 2, tvb_get_ntohs(tvb, offset));
|
|
offset += 2;
|
|
|
|
return offset;
|
|
}
|
|
|
|
|
|
static int
|
|
dissect_msnip_gm(tvbuff_t *tvb, packet_info *pinfo, proto_tree *parent_tree, int offset)
|
|
{
|
|
guint8 count;
|
|
|
|
/* group count */
|
|
count = tvb_get_guint8(tvb, offset);
|
|
proto_tree_add_uint(parent_tree, hf_count, tvb, offset, 1, count);
|
|
offset += 1;
|
|
|
|
/* checksum */
|
|
igmp_checksum(parent_tree, tvb, hf_checksum, hf_checksum_bad, pinfo, 0);
|
|
offset += 2;
|
|
|
|
/* holdtime */
|
|
proto_tree_add_uint(parent_tree, hf_holdtime, tvb, offset, 4, count);
|
|
offset += 4;
|
|
|
|
while (count--) {
|
|
proto_tree *tree;
|
|
proto_item *item;
|
|
guint32 maddr;
|
|
guint8 masklen;
|
|
int old_offset = offset;
|
|
|
|
item = proto_tree_add_item(parent_tree, hf_groups,
|
|
tvb, offset, -1, FALSE);
|
|
tree = proto_item_add_subtree(item, ett_groups);
|
|
|
|
/* multicast group */
|
|
maddr = tvb_get_ipv4(tvb, offset);
|
|
proto_tree_add_ipv4(tree, hf_maddr, tvb, offset, 4,
|
|
maddr);
|
|
offset += 4;
|
|
|
|
/* mask length */
|
|
masklen = tvb_get_guint8(tvb, offset);
|
|
proto_tree_add_uint(tree, hf_mask, tvb,
|
|
offset, 1, masklen);
|
|
offset += 1;
|
|
|
|
/* skip 3 unused bytes */
|
|
offset += 3;
|
|
|
|
if (item) {
|
|
proto_item_set_text(item,"Group: %s/%d",
|
|
ip_to_str((guint8 *)&maddr), masklen);
|
|
|
|
proto_item_set_len(item, offset-old_offset);
|
|
}
|
|
}
|
|
|
|
return offset;
|
|
}
|
|
|
|
|
|
/* This function is only called from the IGMP dissector */
|
|
int
|
|
dissect_msnip(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_msnip))) {
|
|
/* 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_msnip, tvb, offset, -1, FALSE);
|
|
tree = proto_item_add_subtree(item, ett_msnip);
|
|
|
|
|
|
if (check_col(pinfo->cinfo, COL_PROTOCOL)) {
|
|
col_set_str(pinfo->cinfo, COL_PROTOCOL, "MSNIP");
|
|
}
|
|
if (check_col(pinfo->cinfo, COL_INFO)) {
|
|
col_clear(pinfo->cinfo, COL_INFO);
|
|
}
|
|
|
|
|
|
type = tvb_get_guint8(tvb, offset);
|
|
if (check_col(pinfo->cinfo, COL_INFO)) {
|
|
col_add_fstr(pinfo->cinfo, COL_INFO,
|
|
"%s",val_to_str(type, msnip_types,
|
|
"Unknown Type:0x%02x"));
|
|
}
|
|
|
|
/* type of command */
|
|
proto_tree_add_uint(tree, hf_type, tvb, offset, 1, type);
|
|
offset += 1;
|
|
|
|
switch (type) {
|
|
case MSNIP_GM:
|
|
offset = dissect_msnip_gm(tvb, pinfo, tree, offset);
|
|
break;
|
|
case MSNIP_IS:
|
|
offset = dissect_msnip_is(tvb, pinfo, tree, offset);
|
|
break;
|
|
case MSNIP_RMR:
|
|
offset = dissect_msnip_rmr(tvb, pinfo, tree, offset);
|
|
break;
|
|
}
|
|
|
|
if (item) {
|
|
proto_item_set_len(item, offset);
|
|
}
|
|
|
|
return offset;
|
|
}
|
|
|
|
|
|
void
|
|
proto_register_msnip(void)
|
|
{
|
|
static hf_register_info hf[] = {
|
|
{ &hf_type,
|
|
{ "Type", "msnip.type", FT_UINT8, BASE_HEX,
|
|
VALS(msnip_types), 0, "MSNIP Packet Type", HFILL }},
|
|
|
|
{ &hf_checksum,
|
|
{ "Checksum", "msnip.checksum", FT_UINT16, BASE_HEX,
|
|
NULL, 0, "MSNIP Checksum", HFILL }},
|
|
|
|
{ &hf_checksum_bad,
|
|
{ "Bad Checksum", "msnip.checksum_bad", FT_BOOLEAN, BASE_NONE,
|
|
NULL, 0, "Bad MSNIP Checksum", HFILL }},
|
|
|
|
{ &hf_count,
|
|
{ "Count", "msnip.count", FT_UINT8, BASE_DEC,
|
|
NULL, 0, "MSNIP Number of groups", HFILL }},
|
|
|
|
{ &hf_holdtime,
|
|
{ "Holdtime", "msnip.holdtime", FT_UINT32, BASE_DEC,
|
|
NULL, 0, "MSNIP Holdtime in seconds", HFILL }},
|
|
|
|
{ &hf_groups,
|
|
{ "Groups", "msnip.groups", FT_NONE, BASE_NONE,
|
|
NULL, 0, "MSNIP Groups", HFILL }},
|
|
|
|
{ &hf_maddr,
|
|
{ "Multicast group", "msnip.maddr", FT_IPv4, BASE_NONE,
|
|
NULL, 0, "MSNIP Multicast Group", HFILL }},
|
|
|
|
{ &hf_mask,
|
|
{ "Netmask", "msnip.netmask", FT_UINT8, BASE_DEC,
|
|
NULL, 0, "MSNIP Netmask", HFILL }},
|
|
|
|
{ &hf_holdtime16,
|
|
{ "Holdtime", "msnip.holdtime16", FT_UINT16, BASE_DEC,
|
|
NULL, 0, "MSNIP Holdtime in seconds", HFILL }},
|
|
|
|
{ &hf_genid,
|
|
{ "Generation ID", "msnip.genid", FT_UINT16, BASE_DEC,
|
|
NULL, 0, "MSNIP Generation ID", HFILL }},
|
|
|
|
{ &hf_rec_type,
|
|
{ "Record Type", "msnip.rec_type", FT_UINT8, BASE_DEC,
|
|
VALS(msnip_rec_types), 0, "MSNIP Record Type", HFILL }},
|
|
|
|
};
|
|
static gint *ett[] = {
|
|
&ett_msnip,
|
|
&ett_groups,
|
|
};
|
|
|
|
proto_msnip = proto_register_protocol("MSNIP: Multicast Source Notification of Interest Protocol",
|
|
"MSNIP", "msnip");
|
|
proto_register_field_array(proto_msnip, hf, array_length(hf));
|
|
proto_register_subtree_array(ett, array_length(ett));
|
|
}
|
|
|