![Gilbert Ramirez](/assets/img/avatar_default.png)
Also move ncp222.py, x11-fields, process-x11-fields.pl, make-reg-dotc, and make-reg-dotc.py. Adjust #include lines in files that include packet-*.h files. svn path=/trunk/; revision=11410
400 lines
11 KiB
C
400 lines
11 KiB
C
/* packet-gmrp.c
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* Routines for GMRP (GARP Multicast Registration Protocol) dissection
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* Copyright 2001, Markus Seehofer <mseehofe@nt.hirschmann.de>
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*
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* Based on the code from packet-gvrp.c (GVRP) from
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* Kevin Shi <techishi@ms22.hinet.net> Copyright 2000
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*
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* $Id$
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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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#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 <stdlib.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 "llcsaps.h"
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/* Initialize the protocol and registered fields */
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static int proto_gmrp = -1;
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static int hf_gmrp_proto_id = -1;
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static int hf_gmrp_attribute_type = -1;
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static int hf_gmrp_attribute_length = -1;
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static int hf_gmrp_attribute_event = -1;
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static int hf_gmrp_attribute_value_group_membership = -1;
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static int hf_gmrp_attribute_value_service_requirement = -1;
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/*static int hf_gmrp_end_of_mark = -1;*/
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/* Initialize the subtree pointers */
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static gint ett_gmrp = -1;
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/*static gint ett_gmrp_message = -1;
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static gint ett_gmrp_attribute_list = -1;
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static gint ett_gmrp_attribute = -1;*/
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static dissector_handle_t data_handle;
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/* Constant definitions */
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#define GARP_DEFAULT_PROTOCOL_ID 0x0001
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#define GARP_END_OF_MARK 0x00
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#define GMRP_ATTRIBUTE_TYPE_GROUP_MEMBERSHIP 0x01
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#define GMRP_ATTRIBUTE_TYPE_SERVICE_REQUIREMENT 0x02
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#define GMRP_SERVICE_REQUIREMENT_FORWARD_ALL 0x00
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#define GMRP_SERVICE_REQUIREMENT_FORWARD_ALL_UNREGISTERED 0x01
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static const value_string attribute_type_vals[] = {
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{ GMRP_ATTRIBUTE_TYPE_GROUP_MEMBERSHIP ,"Group Membership" },
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{ GMRP_ATTRIBUTE_TYPE_SERVICE_REQUIREMENT ,"Service Requirement" },
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{ 0, NULL }
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};
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/* The length of GMRP LeaveAll attribute should be 2 octets (one for length
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* and the other for event) */
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#define GMRP_LENGTH_LEAVEALL (sizeof(guint8)+sizeof(guint8))
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/* The length of GMRP attribute other than LeaveAll should be:
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*
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* 8 bytes for Group Membership (1 for length, 1 for event and 6 for mac address to register)
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* or
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* 3 bytes for Service Requirement (1 for length, 1 for event, 1 for attribute value)
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*
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*/
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#define GMRP_GROUP_MEMBERSHIP_NON_LEAVEALL (sizeof(guint8)+sizeof(guint8)+(6*sizeof(guint8)))
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#define GMRP_SERVICE_REQUIREMENT_NON_LEAVEALL (sizeof(guint8)+sizeof(guint8)+sizeof(guint8))
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/* Packet offset definitions */
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#define GARP_PROTOCOL_ID 0
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/* Event definitions */
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#define GMRP_EVENT_LEAVEALL 0
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#define GMRP_EVENT_JOINEMPTY 1
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#define GMRP_EVENT_JOININ 2
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#define GMRP_EVENT_LEAVEEMPTY 3
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#define GMRP_EVENT_LEAVEIN 4
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#define GMRP_EVENT_EMPTY 5
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static const value_string event_vals[] = {
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{ GMRP_EVENT_LEAVEALL, "Leave All" },
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{ GMRP_EVENT_JOINEMPTY, "Join Empty" },
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{ GMRP_EVENT_JOININ, "Join In" },
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{ GMRP_EVENT_LEAVEEMPTY, "Leave Empty" },
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{ GMRP_EVENT_LEAVEIN, "Leave In" },
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{ GMRP_EVENT_EMPTY, "Empty" },
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{ 0, NULL }
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};
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/* Code to actually dissect the packets */
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static void
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dissect_gmrp(tvbuff_t *tvb, packet_info *pinfo, proto_tree *tree)
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{
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proto_item *ti;
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proto_tree *gmrp_tree;
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guint16 protocol_id;
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guint8 octet;
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guint8 attribute_type;
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int msg_index, attr_index, offset = 0, length = tvb_reported_length(tvb);
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if (check_col(pinfo->cinfo, COL_PROTOCOL))
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col_set_str(pinfo->cinfo, COL_PROTOCOL, "GMRP");
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if (check_col(pinfo->cinfo, COL_INFO))
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col_set_str(pinfo->cinfo, COL_INFO, "GMRP");
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if (tree)
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{
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ti = proto_tree_add_item(tree, proto_gmrp, tvb, 0, length, FALSE);
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gmrp_tree = proto_item_add_subtree(ti, ett_gmrp);
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/* Read in GARP protocol ID */
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protocol_id = tvb_get_ntohs(tvb, GARP_PROTOCOL_ID);
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proto_tree_add_uint_format(gmrp_tree, hf_gmrp_proto_id, tvb,
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GARP_PROTOCOL_ID, sizeof(guint16),
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protocol_id,
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"Protocol Identifier: 0x%04x (%s)",
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protocol_id,
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protocol_id == GARP_DEFAULT_PROTOCOL_ID ?
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"GARP Multicast Registration Protocol" :
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"Unknown Protocol");
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/* Currently only one protocol ID is supported */
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if (protocol_id != GARP_DEFAULT_PROTOCOL_ID)
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{
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proto_tree_add_text(gmrp_tree, tvb, GARP_PROTOCOL_ID, sizeof(guint16),
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" (Warning: this version of Ethereal only knows about protocol id = 1)");
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call_dissector(data_handle,
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tvb_new_subset(tvb, GARP_PROTOCOL_ID + sizeof(guint16), -1, -1),
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pinfo, tree);
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return;
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}
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offset += sizeof(guint16);
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length -= sizeof(guint16);
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msg_index = 0;
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/* Begin to parse GARP messages */
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while (length)
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{
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proto_item *msg_item;
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int msg_start = offset;
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/* Read in attribute type. */
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attribute_type = octet = tvb_get_guint8(tvb, offset);
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/* Check for end of mark */
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if (octet == GARP_END_OF_MARK)
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{
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/* End of GARP PDU */
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if (msg_index)
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{
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proto_tree_add_text(gmrp_tree, tvb, offset, sizeof(guint8),
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"End of pdu");
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break;
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}
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else
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{
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call_dissector(data_handle,
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tvb_new_subset(tvb, offset, -1, -1),
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pinfo, tree);
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return;
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}
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}
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offset += sizeof(guint8);
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length -= sizeof(guint8);
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msg_item = proto_tree_add_text(gmrp_tree, tvb, msg_start, -1,
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"Message %d", msg_index + 1);
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proto_tree_add_uint(gmrp_tree, hf_gmrp_attribute_type, tvb,
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msg_start, sizeof(guint8), octet);
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/* GMRP supports Group Membership and Service Requirement as attribute types */
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if ( (octet != GMRP_ATTRIBUTE_TYPE_GROUP_MEMBERSHIP) && (octet != GMRP_ATTRIBUTE_TYPE_SERVICE_REQUIREMENT) )
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{
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call_dissector(data_handle,
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tvb_new_subset(tvb, offset, -1, -1), pinfo,
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tree);
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return;
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}
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attr_index = 0;
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while (length)
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{
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int attr_start = offset;
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proto_item *attr_item;
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/* Read in attribute length. */
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octet = tvb_get_guint8(tvb, offset);
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/* Check for end of mark */
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if (octet == GARP_END_OF_MARK)
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{
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/* If at least one message has been already read,
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* check for another end of mark.
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*/
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if (attr_index)
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{
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proto_tree_add_text(gmrp_tree, tvb, offset,
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sizeof(guint8), " End of mark");
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offset += sizeof(guint8);
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length -= sizeof(guint8);
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proto_item_set_len(msg_item, offset - msg_start);
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break;
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}
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else
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{
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call_dissector(data_handle,
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tvb_new_subset(tvb, offset, -1, -1),
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pinfo, tree);
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return;
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}
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}
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else
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{
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guint8 event;
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offset += sizeof(guint8);
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length -= sizeof(guint8);
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attr_item = proto_tree_add_text(gmrp_tree, tvb,
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attr_start, -1, " Attribute %d", attr_index + 1);
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proto_tree_add_uint(gmrp_tree, hf_gmrp_attribute_length,
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tvb, attr_start, sizeof(guint8), octet);
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/* Read in attribute event */
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event = tvb_get_guint8(tvb, offset);
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proto_tree_add_uint(gmrp_tree, hf_gmrp_attribute_event,
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tvb, offset, sizeof(guint8), event);
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offset += sizeof(guint8);
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length -= sizeof(guint8);
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switch (event) {
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case GMRP_EVENT_LEAVEALL:
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if (octet != GMRP_LENGTH_LEAVEALL)
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{
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call_dissector(data_handle,
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tvb_new_subset(tvb, offset, -1, -1),
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pinfo, tree);
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return;
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}
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break;
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case GMRP_EVENT_JOINEMPTY:
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case GMRP_EVENT_JOININ:
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case GMRP_EVENT_LEAVEEMPTY:
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case GMRP_EVENT_LEAVEIN:
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case GMRP_EVENT_EMPTY:
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if ( (octet != GMRP_GROUP_MEMBERSHIP_NON_LEAVEALL) && (octet != GMRP_SERVICE_REQUIREMENT_NON_LEAVEALL) )
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{
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call_dissector(data_handle,
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tvb_new_subset(tvb, offset, -1, -1),
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pinfo, tree);
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return;
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}
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/* Show attribute value */
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if ( GMRP_ATTRIBUTE_TYPE_GROUP_MEMBERSHIP == attribute_type )
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{
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/* Group Membership */
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proto_tree_add_item(gmrp_tree, hf_gmrp_attribute_value_group_membership,
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tvb, offset, (6*sizeof(guint8)), FALSE);
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offset += 6*sizeof(guint8);
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length -= 6*sizeof(guint8);
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}
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else
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if ( GMRP_ATTRIBUTE_TYPE_SERVICE_REQUIREMENT == attribute_type )
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{
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/* Service Requirement */
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proto_tree_add_item(gmrp_tree, hf_gmrp_attribute_value_service_requirement,
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tvb, offset, sizeof(guint8), FALSE);
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offset += sizeof(guint8);
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length -= sizeof(guint8);
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}
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else
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{
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call_dissector(data_handle,
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tvb_new_subset(tvb, offset, -1, -1),
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pinfo, tree);
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return;
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}
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break;
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default:
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call_dissector(data_handle,
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tvb_new_subset(tvb, offset, -1, -1),
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pinfo, tree);
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return;
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}
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}
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proto_item_set_len(attr_item, offset - attr_start);
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attr_index++;
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}
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msg_index++;
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}
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}
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}
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/* Register the protocol with Ethereal */
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void
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proto_register_gmrp(void)
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{
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static hf_register_info hf[] = {
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{ &hf_gmrp_proto_id,
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{ "Protocol ID", "garp.protocol_id",
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FT_UINT16, BASE_HEX, NULL, 0x0,
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"" , HFILL }
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},
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{ &hf_gmrp_attribute_type,
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{ "Type", "garp.attribute_type",
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FT_UINT8, BASE_HEX, VALS(attribute_type_vals), 0x0,
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"" , HFILL }
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},
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{ &hf_gmrp_attribute_length,
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{ "Length", "garp.attribute_length",
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FT_UINT8, BASE_DEC, NULL, 0x0,
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"" , HFILL }
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},
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{ &hf_gmrp_attribute_event,
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{ "Event", "garp.attribute_event",
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FT_UINT8, BASE_DEC, VALS(event_vals), 0x0,
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"" , HFILL }
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},
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{ &hf_gmrp_attribute_value_group_membership,
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{ "Value", "garp.attribute_value_group_membership",
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FT_ETHER, BASE_HEX, NULL, 0x0,
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"" , HFILL }
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},
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{ &hf_gmrp_attribute_value_service_requirement,
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{ "Value", "garp.attribute_value_service_requirement",
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FT_UINT8, BASE_HEX, NULL, 0x0,
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"" , HFILL }
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}
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};
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static gint *ett[] = {
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&ett_gmrp
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};
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/* Register the protocol name and description for GMRP */
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proto_gmrp = proto_register_protocol("GARP Multicast Registration Protocol", "GMRP", "gmrp");
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/* Required function calls to register the header fields and subtrees
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* used by GMRP */
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proto_register_field_array(proto_gmrp, hf, array_length(hf));
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proto_register_subtree_array(ett, array_length(ett));
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register_dissector("gmrp", dissect_gmrp, proto_gmrp);
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}
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void
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proto_reg_handoff_gmrp(void){
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data_handle = find_dissector("data");
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}
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