forked from osmocom/wireshark
0e7c1de08a
protocols, in addition to adding structures to the list of filterable fields. Give it an extra argument that specifies a "short name" for the protocol, for use in such places as pinfo->current_proto; the dialog box for constructing filters; the preferences tab for the protocol; and so on (although we're not yet using it in all those places). Make the preference name that appears in the preferences file and the command line for the DIAMETER protocol "diameter", not "Diameter"; the convention is that the name in question be all-lower-case. Make some routines and variables that aren't exported static. Update a comment in the ICP dissector to make it clear that the dissector won't see fragments other than the first fragment of a fragmented datagram. svn path=/trunk/; revision=2810
347 lines
8.8 KiB
C
347 lines
8.8 KiB
C
/* packet-gvrp.c
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* Routines for GVRP (GARP VLAN Registration Protocol) dissection
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* Copyright 2000, Kevin Shi <techishi@ms22.hinet.net>
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*
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* $Id: packet-gvrp.c,v 1.4 2001/01/03 06:55:28 guy Exp $
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*
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* Ethereal - Network traffic analyzer
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* By Gerald Combs <gerald@zing.org>
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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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#ifdef HAVE_SYS_TYPES_H
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# include <sys/types.h>
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#endif
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#ifdef HAVE_NETINET_IN_H
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# include <netinet/in.h>
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#endif
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#include <glib.h>
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#ifdef NEED_SNPRINTF_H
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# include "snprintf.h"
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#endif
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#include "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_gvrp = -1;
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static int hf_gvrp_proto_id = -1;
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static int hf_gvrp_attribute_type = -1;
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static int hf_gvrp_attribute_length = -1;
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static int hf_gvrp_attribute_event = -1;
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static int hf_gvrp_attribute_value = -1;
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/*static int hf_gvrp_end_of_mark = -1;*/
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/* Initialize the subtree pointers */
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static gint ett_gvrp = -1;
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/*static gint ett_gvrp_message = -1;
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static gint ett_gvrp_attribute_list = -1;
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static gint ett_gvrp_attribute = -1;*/
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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 GVRP_ATTRIBUTE_TYPE 0x01
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static const value_string attribute_type_vals[] = {
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{ GVRP_ATTRIBUTE_TYPE, "VID" },
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{ 0, NULL }
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};
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/* The length of GVRP LeaveAll attribute should be 2 octets (one for length
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* and the other for event) */
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#define GVRP_LENGTH_LEAVEALL (sizeof(guint8)+sizeof(guint8))
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/* The length of GVRP attribute other than LeaveAll should be 4 octets (one
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* for length, one for event, and the last two for VID value).
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*/
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#define GVRP_LENGTH_NON_LEAVEALL (sizeof(guint8)+sizeof(guint8)+sizeof(guint16))
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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 GVRP_EVENT_LEAVEALL 0
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#define GVRP_EVENT_JOINEMPTY 1
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#define GVRP_EVENT_JOININ 2
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#define GVRP_EVENT_LEAVEEMPTY 3
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#define GVRP_EVENT_LEAVEIN 4
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#define GVRP_EVENT_EMPTY 5
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static const value_string event_vals[] = {
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{ GVRP_EVENT_LEAVEALL, "Leave All" },
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{ GVRP_EVENT_JOINEMPTY, "Join Empty" },
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{ GVRP_EVENT_JOININ, "Join In" },
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{ GVRP_EVENT_LEAVEEMPTY, "Leave Empty" },
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{ GVRP_EVENT_LEAVEIN, "Leave In" },
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{ GVRP_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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void
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dissect_gvrp(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 *gvrp_tree;
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guint16 protocol_id;
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guint8 octet;
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int msg_index, attr_index, offset = 0, length = tvb_reported_length(tvb);
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CHECK_DISPLAY_AS_DATA(proto_gvrp, tvb, pinfo, tree);
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pinfo->current_proto = "GVRP";
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if (check_col(pinfo->fd, COL_PROTOCOL))
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col_set_str(pinfo->fd, COL_PROTOCOL, "GVRP");
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if (check_col(pinfo->fd, COL_INFO))
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col_set_str(pinfo->fd, COL_INFO, "GVRP");
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if (tree)
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{
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ti = proto_tree_add_item(tree, proto_gvrp, tvb, 0, length, FALSE);
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gvrp_tree = proto_item_add_subtree(ti, ett_gvrp);
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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(gvrp_tree, hf_gvrp_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 VLAN 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(gvrp_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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dissect_data(tvb, GARP_PROTOCOL_ID + sizeof(guint16), 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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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(gvrp_tree, tvb, offset, sizeof(guint8),
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"End of mark");
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break;
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}
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else
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{
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dissect_data(tvb, offset, 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(gvrp_tree, tvb, msg_start, 0,
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"Message %d", msg_index + 1);
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proto_tree_add_uint(gvrp_tree, hf_gvrp_attribute_type, tvb,
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msg_start, sizeof(guint8), octet);
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/* GVRP only supports one attribute type. */
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if (octet != GVRP_ATTRIBUTE_TYPE)
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{
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dissect_data(tvb, offset, pinfo, 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(gvrp_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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dissect_data(tvb, offset, 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(gvrp_tree, tvb,
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attr_start, 0, " Attribute %d", attr_index + 1);
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proto_tree_add_uint(gvrp_tree, hf_gvrp_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(gvrp_tree, hf_gvrp_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 GVRP_EVENT_LEAVEALL:
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if (octet != GVRP_LENGTH_LEAVEALL)
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{
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dissect_data(tvb, offset, pinfo, tree);
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return;
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}
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break;
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case GVRP_EVENT_JOINEMPTY:
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case GVRP_EVENT_JOININ:
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case GVRP_EVENT_LEAVEEMPTY:
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case GVRP_EVENT_LEAVEIN:
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case GVRP_EVENT_EMPTY:
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if (octet != GVRP_LENGTH_NON_LEAVEALL)
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{
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dissect_data(tvb, offset, pinfo, tree);
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return;
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}
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/* Show attribute value */
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proto_tree_add_item(gvrp_tree, hf_gvrp_attribute_value,
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tvb, offset, sizeof(guint16), FALSE);
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offset += sizeof(guint16);
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length -= sizeof(guint16);
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break;
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default:
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dissect_data(tvb, offset, 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_gvrp(void)
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{
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static hf_register_info hf[] = {
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{ &hf_gvrp_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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"" }
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},
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{ &hf_gvrp_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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"" }
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},
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{ &hf_gvrp_attribute_length,
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{ "Length", "garp.attribute_length",
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FT_UINT8, BASE_DEC, NULL, 0x0,
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"" }
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},
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{ &hf_gvrp_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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"" }
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},
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{ &hf_gvrp_attribute_value,
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{ "Value", "garp.attribute_value",
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FT_UINT16, BASE_DEC, NULL, 0x0,
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"" }
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}
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};
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static gint *ett[] = {
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&ett_gvrp
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};
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/* Register the protocol name and description for GVRP */
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proto_gvrp = proto_register_protocol("GARP VLAN Registration Protocol",
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"GVRP", "gvrp");
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/* Required function calls to register the header fields and subtrees
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* used by GVRP */
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proto_register_field_array(proto_gvrp, hf, array_length(hf));
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proto_register_subtree_array(ett, array_length(ett));
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}
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