forked from osmocom/wireshark
335 lines
8.2 KiB
C
335 lines
8.2 KiB
C
/* packet-msnip.c 2001 Ronnie Sahlberg <See AUTHORS for email>
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* Routines for IGMP/MSNIP packet disassembly
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*
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* $Id: packet-msnip.c,v 1.9 2003/11/16 23:17:20 guy Exp $
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*
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* Ethereal - Network traffic analyzer
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* By Gerald Combs <gerald@ethereal.com>
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* Copyright 1998 Gerald Combs
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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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/*
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MSNIP
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code
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0x23 x
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0x24 x
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0x25 x
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MSNIP " Multicast Source Notification of Interest Protocol
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Defined in draft-ietf-idmr-igmp-msnip-00.txt
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*/
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#ifdef HAVE_CONFIG_H
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# include "config.h"
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#endif
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#include <stdio.h>
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#include <string.h>
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#include <glib.h>
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#include <epan/packet.h>
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#include "packet-igmp.h"
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#include "packet-msnip.h"
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static int proto_msnip = -1;
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static int hf_checksum = -1;
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static int hf_checksum_bad = -1;
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static int hf_type = -1;
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static int hf_count = -1;
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static int hf_holdtime = -1;
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static int hf_groups = -1;
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static int hf_maddr = -1;
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static int hf_mask = -1;
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static int hf_holdtime16 = -1;
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static int hf_genid = -1;
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static int hf_rec_type = -1;
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static int ett_msnip = -1;
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static int ett_groups = -1;
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#define MSNIP_GM 0x23
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#define MSNIP_IS 0x24
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#define MSNIP_RMR 0x25
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static const value_string msnip_types[] = {
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{MSNIP_GM, "Multicast Group Map"},
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{MSNIP_IS, "Multicast Interest Solicitation"},
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{MSNIP_RMR, "Multicast Receiver Membership Report"},
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{0, NULL}
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};
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#define MSNIP_RECTYPE_TRANSMIT 1
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#define MSNIP_RECTYPE_HOLD 2
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static const value_string msnip_rec_types[] = {
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{MSNIP_RECTYPE_TRANSMIT, "Request to start transmitting group"},
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{MSNIP_RECTYPE_HOLD, "Request to hold transmitting group"},
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{0, NULL}
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};
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static int
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dissect_msnip_rmr(tvbuff_t *tvb, packet_info *pinfo, proto_tree *parent_tree, int offset)
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{
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guint8 count;
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/* group count */
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count = tvb_get_guint8(tvb, offset);
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proto_tree_add_uint(parent_tree, hf_count, tvb, offset, 1, count);
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offset += 1;
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/* checksum */
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igmp_checksum(parent_tree, tvb, hf_checksum, hf_checksum_bad, pinfo, 0);
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offset += 2;
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while (count--) {
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proto_tree *tree;
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proto_item *item;
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guint8 rec_type;
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guint32 maddr;
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int old_offset = offset;
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item = proto_tree_add_item(parent_tree, hf_groups,
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tvb, offset, -1, FALSE);
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tree = proto_item_add_subtree(item, ett_groups);
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/* record type */
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rec_type = tvb_get_guint8(tvb, offset);
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proto_tree_add_uint(tree, hf_rec_type, tvb, offset, 1, rec_type);
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offset += 1;
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/* skip 3 unused bytes */
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offset += 3;
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/* multicast group */
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tvb_memcpy(tvb, (guint8 *)&maddr, offset, 4);
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proto_tree_add_ipv4(tree, hf_maddr, tvb, offset, 4,
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maddr);
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offset += 4;
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if (item) {
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proto_item_set_text(item,"Group: %s %s",
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ip_to_str((guint8 *)&maddr),
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val_to_str(rec_type, msnip_rec_types,
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"Unknown Type:0x%02x"));
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proto_item_set_len(item, offset-old_offset);
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}
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}
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return offset;
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}
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static int
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dissect_msnip_is(tvbuff_t *tvb, packet_info *pinfo, proto_tree *parent_tree, int offset)
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{
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/* skip reserved byte */
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offset += 1;
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/* checksum */
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igmp_checksum(parent_tree, tvb, hf_checksum, hf_checksum_bad, pinfo, 0);
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offset += 2;
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/* 16 bit holdtime */
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proto_tree_add_uint(parent_tree, hf_holdtime16, tvb, offset, 2, tvb_get_ntohs(tvb, offset));
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offset += 2;
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/* Generation ID */
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proto_tree_add_uint(parent_tree, hf_genid, tvb, offset, 2, tvb_get_ntohs(tvb, offset));
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offset += 2;
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return offset;
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}
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static int
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dissect_msnip_gm(tvbuff_t *tvb, packet_info *pinfo, proto_tree *parent_tree, int offset)
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{
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guint8 count;
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/* group count */
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count = tvb_get_guint8(tvb, offset);
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proto_tree_add_uint(parent_tree, hf_count, tvb, offset, 1, count);
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offset += 1;
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/* checksum */
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igmp_checksum(parent_tree, tvb, hf_checksum, hf_checksum_bad, pinfo, 0);
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offset += 2;
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/* holdtime */
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proto_tree_add_uint(parent_tree, hf_holdtime, tvb, offset, 4, count);
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offset += 4;
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while (count--) {
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proto_tree *tree;
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proto_item *item;
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guint32 maddr;
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guint8 masklen;
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int old_offset = offset;
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item = proto_tree_add_item(parent_tree, hf_groups,
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tvb, offset, -1, FALSE);
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tree = proto_item_add_subtree(item, ett_groups);
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/* multicast group */
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tvb_memcpy(tvb, (guint8 *)&maddr, offset, 4);
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proto_tree_add_ipv4(tree, hf_maddr, tvb, offset, 4,
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maddr);
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offset += 4;
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/* mask length */
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masklen = tvb_get_guint8(tvb, offset);
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proto_tree_add_uint(tree, hf_mask, tvb,
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offset, 1, masklen);
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offset += 1;
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/* skip 3 unused bytes */
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offset += 3;
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if (item) {
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proto_item_set_text(item,"Group: %s/%d",
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ip_to_str((guint8 *)&maddr), masklen);
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proto_item_set_len(item, offset-old_offset);
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}
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}
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return offset;
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}
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/* This function is only called from the IGMP dissector */
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int
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dissect_msnip(tvbuff_t *tvb, packet_info *pinfo, proto_tree *parent_tree, int offset)
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{
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proto_tree *tree;
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proto_item *item;
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guint8 type;
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if (!proto_is_protocol_enabled(find_protocol_by_id(proto_msnip))) {
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/* we are not enabled, skip entire packet to be nice
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to the igmp layer. (so clicking on IGMP will display the data)
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*/
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return offset+tvb_length_remaining(tvb, offset);
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}
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item = proto_tree_add_item(parent_tree, proto_msnip, tvb, offset, -1, FALSE);
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tree = proto_item_add_subtree(item, ett_msnip);
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if (check_col(pinfo->cinfo, COL_PROTOCOL)) {
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col_set_str(pinfo->cinfo, COL_PROTOCOL, "MSNIP");
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}
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if (check_col(pinfo->cinfo, COL_INFO)) {
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col_clear(pinfo->cinfo, COL_INFO);
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}
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type = tvb_get_guint8(tvb, offset);
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if (check_col(pinfo->cinfo, COL_INFO)) {
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col_add_fstr(pinfo->cinfo, COL_INFO,
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"%s",val_to_str(type, msnip_types,
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"Unknown Type:0x%02x"));
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}
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/* type of command */
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proto_tree_add_uint(tree, hf_type, tvb, offset, 1, type);
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offset += 1;
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switch (type) {
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case MSNIP_GM:
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offset = dissect_msnip_gm(tvb, pinfo, tree, offset);
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break;
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case MSNIP_IS:
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offset = dissect_msnip_is(tvb, pinfo, tree, offset);
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break;
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case MSNIP_RMR:
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offset = dissect_msnip_rmr(tvb, pinfo, tree, offset);
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break;
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}
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if (item) {
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proto_item_set_len(item, offset);
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}
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return offset;
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}
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void
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proto_register_msnip(void)
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{
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static hf_register_info hf[] = {
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{ &hf_type,
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{ "Type", "msnip.type", FT_UINT8, BASE_HEX,
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VALS(msnip_types), 0, "MSNIP Packet Type", HFILL }},
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{ &hf_checksum,
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{ "Checksum", "msnip.checksum", FT_UINT16, BASE_HEX,
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NULL, 0, "MSNIP Checksum", HFILL }},
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{ &hf_checksum_bad,
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{ "Bad Checksum", "msnip.checksum_bad", FT_BOOLEAN, BASE_NONE,
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NULL, 0, "Bad MSNIP Checksum", HFILL }},
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{ &hf_count,
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{ "Count", "msnip.count", FT_UINT8, BASE_DEC,
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NULL, 0, "MSNIP Number of groups", HFILL }},
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{ &hf_holdtime,
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{ "Holdtime", "msnip.holdtime", FT_UINT32, BASE_DEC,
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NULL, 0, "MSNIP Holdtime in seconds", HFILL }},
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{ &hf_groups,
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{ "Groups", "msnip.groups", FT_NONE, BASE_NONE,
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NULL, 0, "MSNIP Groups", HFILL }},
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{ &hf_maddr,
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{ "Multicast group", "msnip.maddr", FT_IPv4, BASE_NONE,
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NULL, 0, "MSNIP Multicast Group", HFILL }},
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{ &hf_mask,
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{ "Netmask", "msnip.netmask", FT_UINT8, BASE_DEC,
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NULL, 0, "MSNIP Netmask", HFILL }},
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{ &hf_holdtime16,
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{ "Holdtime", "msnip.holdtime16", FT_UINT16, BASE_DEC,
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NULL, 0, "MSNIP Holdtime in seconds", HFILL }},
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{ &hf_genid,
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{ "Generation ID", "msnip.genid", FT_UINT16, BASE_DEC,
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NULL, 0, "MSNIP Generation ID", HFILL }},
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{ &hf_rec_type,
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{ "Record Type", "msnip.rec_type", FT_UINT8, BASE_DEC,
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VALS(msnip_rec_types), 0, "MSNIP Record Type", HFILL }},
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};
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static gint *ett[] = {
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&ett_msnip,
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&ett_groups,
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};
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proto_msnip = proto_register_protocol("MSNIP: Multicast Source Notification of Interest Protocol",
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"MSNIP", "msnip");
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proto_register_field_array(proto_msnip, hf, array_length(hf));
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proto_register_subtree_array(ett, array_length(ett));
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}
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