forked from osmocom/wireshark
8ed7a73e22
Cast away some implicit 64-bit-to-32-bit conversion errors due to use of sizeof. Cast away some implicit 64-bit-to-32-bit conversion errors due to use of strtol() and strtoul(). Change some data types to avoid those implicit conversion warnings. When assigning a constant to a float, make sure the constant isn't a double, by appending "f" to the constant. Constify a bunch of variables, parameters, and return values to eliminate warnings due to strings being given const qualifiers. Cast away those warnings in some cases where an API we don't control forces us to do so. Enable a bunch of additional warnings by default. Note why at least some of the other warnings aren't enabled. randpkt.c and text2pcap.c are used to build programs, so they don't need to be in EXTRA_DIST. If the user specifies --enable-warnings-as-errors, add -Werror *even if the user specified --enable-extra-gcc-flags; assume they know what they're doing and are willing to have the compile fail due to the extra GCC warnings being treated as errors. svn path=/trunk/; revision=46748
345 lines
12 KiB
C
345 lines
12 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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* $Id$
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*
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* Wireshark - Network traffic analyzer
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* By Gerald Combs <gerald@wireshark.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., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
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*/
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#include "config.h"
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#include <glib.h>
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#include <epan/packet.h>
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#include <epan/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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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 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 (int)(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 (int)(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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static 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;
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int attr_index;
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int offset = 0;
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int length = tvb_reported_length(tvb);
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col_set_str(pinfo->cinfo, COL_PROTOCOL, "GVRP");
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col_set_str(pinfo->cinfo, 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, ENC_NA);
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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, (int)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, (int)sizeof(guint16),
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" (Warning: this version of Wireshark 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 + (int)sizeof(guint16), -1, -1),
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pinfo, tree);
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return;
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}
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offset += (int)sizeof(guint16);
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length -= (int)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, (int)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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call_dissector(data_handle,
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tvb_new_subset_remaining(tvb, offset), pinfo, tree);
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return;
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}
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}
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offset += (int)sizeof(guint8);
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length -= (int)sizeof(guint8);
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msg_item = proto_tree_add_text(gvrp_tree, tvb, msg_start, -1,
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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, (int)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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call_dissector(data_handle, tvb_new_subset_remaining(tvb, offset),
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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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(int)sizeof(guint8), " End of mark");
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offset += (int)sizeof(guint8);
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length -= (int)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_remaining(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 += (int)sizeof(guint8);
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length -= (int)sizeof(guint8);
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attr_item = proto_tree_add_text(gvrp_tree, tvb,
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attr_start, -1, " 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, (int)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, (int)sizeof(guint8), event);
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offset += (int)sizeof(guint8);
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length -= (int)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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call_dissector(data_handle,
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tvb_new_subset_remaining(tvb, offset), pinfo,
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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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call_dissector(data_handle,
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tvb_new_subset_remaining(tvb, offset),pinfo,
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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, (int)sizeof(guint16), ENC_BIG_ENDIAN);
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offset += (int)sizeof(guint16);
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length -= (int)sizeof (guint16);
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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_remaining(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 Wireshark */
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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", "gvrp.protocol_id",
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FT_UINT16, BASE_HEX, NULL, 0x0,
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NULL, HFILL }
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},
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{ &hf_gvrp_attribute_type,
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{ "Type", "gvrp.attribute_type",
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FT_UINT8, BASE_HEX, VALS(attribute_type_vals), 0x0,
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NULL, HFILL }
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},
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{ &hf_gvrp_attribute_length,
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{ "Length", "gvrp.attribute_length",
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FT_UINT8, BASE_DEC, NULL, 0x0,
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NULL, HFILL }
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},
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{ &hf_gvrp_attribute_event,
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{ "Event", "gvrp.attribute_event",
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FT_UINT8, BASE_DEC, VALS(event_vals), 0x0,
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NULL, HFILL }
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},
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{ &hf_gvrp_attribute_value,
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{ "Value", "gvrp.attribute_value",
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FT_UINT16, BASE_DEC, NULL, 0x0,
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NULL, HFILL }
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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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register_dissector("gvrp", dissect_gvrp, proto_gvrp);
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}
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void
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proto_reg_handoff_gvrp(void){
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data_handle = find_dissector("data");
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}
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