362 lines
9.8 KiB
C
362 lines
9.8 KiB
C
/* packet-bfcp.c
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* Routines for Binary Floor Control Protocol(BFCP) dissection
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* Copyright 2012, Nitinkumar Yemul <nitinkumaryemul@gmail.com>
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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 modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (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 along
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* with this program; if not, write to the Free Software Foundation, Inc.,
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* 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
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*
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* BFCP Message structure is defined in RFC 4582.
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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 <glib.h>
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#include <epan/packet.h>
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#include <epan/prefs.h>
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#include <epan/expert.h>
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/* Initialize protocol and registered fields */
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static int proto_bfcp = -1;
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static gboolean bfcp_enable_heuristic_dissection = FALSE;
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static int hf_bfcp_transaction_initiator = -1;
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static int hf_bfcp_primitive = -1;
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static int hf_bfcp_payload_length = -1;
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static int hf_bfcp_conference_id = -1;
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static int hf_bfcp_transaction_id = -1;
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static int hf_bfcp_user_id = -1;
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static int hf_bfcp_payload = -1;
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static int hf_bfcp_attribute_types = -1;
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static int hf_bfcp_attribute_length = -1;
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static int hf_bfcp_request_status = -1;
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/* Initialize subtree pointers */
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static gint ett_bfcp = -1;
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/* Initialize BFCP primitives */
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static const value_string map_bfcp_primitive[] = {
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{ 0, "<Invalid Primitive>"},
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{ 1, "FloorRequest"},
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{ 2, "FloorRelease"},
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{ 3, "FloorRequestQuery"},
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{ 4, "FloorRequestStatus"},
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{ 5, "UserQuery"},
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{ 6, "UserStatus"},
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{ 7, "FloorQuery"},
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{ 8, "FloorStatus"},
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{ 9, "ChairAction"},
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{ 10, "ChairActionAck"},
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{ 11, "Hello"},
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{ 12, "HelloAck"},
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{ 13, "Error"},
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{ 14, "FloorRequestStatusAck"},
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{ 15, "ErrorAck"},
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{ 16, "FloorStatusAck"},
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{ 17, "Goodbye"},
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{ 18, "GoodbyeAck"},
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{ 0, NULL},
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};
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static const value_string map_bfcp_attribute_types[] = {
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{ 0, "<Invalid Primitive>"},
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{ 1, "BeneficiaryID"},
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{ 2, "FloorID"},
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{ 3, "FloorRequestID"},
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{ 4, "Priority"},
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{ 5, "RequestStatus"},
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{ 6, "ErrorCode"},
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{ 7, "ErrorInfo"},
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{ 8, "ParticipantProvidedInfo"},
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{ 9, "StatusInfo"},
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{ 10, "SupportedAttributes"},
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{ 11, "SupportedPrimitives"},
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{ 12, "UserDisplayName"},
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{ 13, "UserURI"},
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{ 14, "BeneficiaryInformation"},
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{ 15, "FloorRequestInformation"},
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{ 16, "RequestedByInformation"},
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{ 17, "FloorRequestStatus"},
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{ 18, "OverallRequestStatus"},
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{ 0, NULL},
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};
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static const value_string map_bfcp_request_status[] = {
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{ 0, "<Invalid Primitive>"},
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{ 1, "Pending"},
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{ 2, "Accepted"},
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{ 3, "Granted"},
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{ 4, "Denied"},
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{ 5, "Cancelled"},
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{ 6, "Released"},
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{ 7, "Revoked"},
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{ 0, NULL},
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};
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/*Define offset for fields in BFCP packet */
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#define BFCP_OFFSET_TRANSACTION_INITIATOR 0
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#define BFCP_OFFSET_PRIMITIVE 1
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#define BFCP_OFFSET_PAYLOAD_LENGTH 2
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#define BFCP_OFFSET_CONFERENCE_ID 4
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#define BFCP_OFFSET_TRANSACTION_ID 8
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#define BFCP_OFFSET_USER_ID 10
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#define BFCP_OFFSET_PAYLOAD 12
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/* Code to actually dissect BFCP packets */
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static gboolean dissect_bfcp(tvbuff_t *tvb, packet_info *pinfo, proto_tree *tree)
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{
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guint8 first_byte;
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guint8 primitive;
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const gchar *str;
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gint bfcp_payload_length;
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gint read_attr = 0;
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proto_tree *bfcp_tree = NULL;
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/* Size of smallest BFCP packet: 12 octets */
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if (tvb_length(tvb) < 12)
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return FALSE;
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/* Check version and reserved bits in first byte */
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first_byte = tvb_get_guint8(tvb, 0);
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/* If first_byte of bfcp_packet is a combination of the
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* version and the I bit. The value must be either 0x20 or 0x30
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* if the bit is set, otherwise it is not BFCP.
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*/
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if ((first_byte != 0x20) && (first_byte != 0x30))
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return FALSE;
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primitive = tvb_get_guint8(tvb, 1);
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if ((primitive < 1) || (primitive > 18))
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return FALSE;
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str = match_strval(primitive, map_bfcp_primitive);
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if (NULL == str)
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return FALSE;
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/* Make entries in Protocol column and Info column on summary display*/
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col_set_str(pinfo->cinfo, COL_PROTOCOL, "BFCP");
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col_add_str(pinfo->cinfo, COL_INFO, str);
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if (tree) {
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proto_item *ti;
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ti = proto_tree_add_item(tree, proto_bfcp, tvb, 0, -1, ENC_NA);
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bfcp_tree = proto_item_add_subtree(ti, ett_bfcp);
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/* Add items to BFCP tree */
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proto_tree_add_item(bfcp_tree, hf_bfcp_transaction_initiator, tvb,
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BFCP_OFFSET_TRANSACTION_INITIATOR, 1, ENC_BIG_ENDIAN);
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proto_tree_add_item(bfcp_tree, hf_bfcp_primitive, tvb,
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BFCP_OFFSET_PRIMITIVE, 1, ENC_BIG_ENDIAN);
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proto_tree_add_item(bfcp_tree, hf_bfcp_payload_length, tvb,
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BFCP_OFFSET_PAYLOAD_LENGTH, 2, ENC_BIG_ENDIAN);
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proto_tree_add_item(bfcp_tree, hf_bfcp_conference_id, tvb,
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BFCP_OFFSET_CONFERENCE_ID, 4, ENC_BIG_ENDIAN);
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proto_tree_add_item(bfcp_tree, hf_bfcp_transaction_id, tvb,
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BFCP_OFFSET_TRANSACTION_ID, 2, ENC_BIG_ENDIAN);
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proto_tree_add_item(bfcp_tree, hf_bfcp_user_id, tvb,
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BFCP_OFFSET_USER_ID, 2, ENC_BIG_ENDIAN);
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}
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bfcp_payload_length = tvb_get_ntohs(tvb,
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BFCP_OFFSET_PAYLOAD_LENGTH) * 4;
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while ((tvb_reported_length_remaining(tvb, BFCP_OFFSET_PAYLOAD + read_attr) >= 2) &&
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((bfcp_payload_length - read_attr) >= 2))
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{
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proto_item *ti;
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gint read = 0;
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gint length;
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guint8 first_byte;
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guint8 attribute_type;
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first_byte = tvb_get_guint8(tvb, BFCP_OFFSET_PAYLOAD + read_attr);
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/* Padding so continue to next attribute */
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if (first_byte == 0)
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{
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read_attr++;
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continue;
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}
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proto_tree_add_item(bfcp_tree, hf_bfcp_attribute_types, tvb,
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BFCP_OFFSET_PAYLOAD + read_attr,1, ENC_BIG_ENDIAN);
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attribute_type = (first_byte & 0xFE) >> 1;
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read++;
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ti = proto_tree_add_item(bfcp_tree, hf_bfcp_attribute_length, tvb,
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BFCP_OFFSET_PAYLOAD + read_attr + read,1, ENC_BIG_ENDIAN);
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length = tvb_get_guint8(tvb, BFCP_OFFSET_PAYLOAD + read_attr + read);
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read++;
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/* If RequestStatus then show what type of status it is... */
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if (attribute_type == 5)
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{
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proto_tree_add_item(bfcp_tree, hf_bfcp_request_status, tvb,
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BFCP_OFFSET_PAYLOAD + read_attr + read,1, ENC_BIG_ENDIAN);
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read++;
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}
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if (length >= read)
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{
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proto_tree_add_item(bfcp_tree, hf_bfcp_payload, tvb,
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BFCP_OFFSET_PAYLOAD + read_attr + read, length-read, ENC_NA);
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}
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else
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{
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expert_add_info_format(pinfo, ti, PI_MALFORMED, PI_ERROR,
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"Attribute length is too small (%d bytes)", length);
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break;
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}
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read_attr = read_attr + length;
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}
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return TRUE;
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}
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void proto_reg_handoff_bfcp(void);
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void proto_register_bfcp(void)
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{
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module_t *bfcp_module;
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static hf_register_info hf[] = {
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{
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&hf_bfcp_transaction_initiator,
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{ "Transaction Initiator", "bfcp.transaction_initiator",
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FT_BOOLEAN, 8,
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NULL, 0x10,
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NULL, HFILL }
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},
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{
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&hf_bfcp_primitive,
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{ "Primitive", "bfcp.primitive",
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FT_UINT8, BASE_DEC,
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VALS(map_bfcp_primitive), 0x0,
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NULL, HFILL }
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},
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{
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&hf_bfcp_payload_length,
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{ "Payload Length", "bfcp.payload_length",
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FT_UINT16, BASE_DEC,
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NULL, 0x0,
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NULL, HFILL }
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},
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{
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&hf_bfcp_conference_id,
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{ "Conference ID", "bfcp.conference_id",
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FT_UINT32, BASE_DEC,
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NULL, 0x0,
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NULL, HFILL }
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},
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{
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&hf_bfcp_transaction_id,
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{ "Transaction ID", "bfcp.transaction_id",
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FT_UINT16, BASE_DEC,
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NULL, 0x0,
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NULL, HFILL }
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},
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{
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&hf_bfcp_user_id,
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{ "User ID", "bfcp.user_id",
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FT_UINT16, BASE_DEC,
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NULL, 0x0,
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NULL, HFILL }
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},
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{
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&hf_bfcp_payload,
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{ "Payload", "bfcp.payload",
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FT_BYTES, BASE_NONE,
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NULL, 0x0, NULL,
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HFILL }
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},
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{
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&hf_bfcp_attribute_types,
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{ "Attribute Type", "bfcp.attribute_type",
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FT_UINT8, BASE_DEC,
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VALS(map_bfcp_attribute_types), 0xFE,
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NULL, HFILL }
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},
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{
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&hf_bfcp_attribute_length,
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{ "Attribute Length", "bfcp.attribute_length",
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FT_UINT16, BASE_DEC,
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NULL, 0x0,
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NULL, HFILL }
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},
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{
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&hf_bfcp_request_status,
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{ "Request Status", "bfcp.request_status",
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FT_UINT8, BASE_DEC,
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VALS(map_bfcp_request_status), 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_bfcp
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};
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/* Register protocol name and description */
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proto_bfcp = proto_register_protocol("Binary Floor Control Protocol",
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"BFCP", "bfcp");
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bfcp_module = prefs_register_protocol(proto_bfcp,
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proto_reg_handoff_bfcp);
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prefs_register_bool_preference(bfcp_module, "enable",
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"Enable BFCP heuristic dissection",
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"Enable BFCP heuristic dissection (default is disabled)",
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&bfcp_enable_heuristic_dissection);
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/* Register field and subtree array */
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proto_register_field_array(proto_bfcp, hf, array_length(hf));
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proto_register_subtree_array(ett, array_length(ett));
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}
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void proto_reg_handoff_bfcp(void)
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{
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static gboolean prefs_initialized = FALSE;
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/* "Decode As" is always available;
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* Heuristic dissection in disabled by default since
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* the heuristic is quite weak.
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*/
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if (!prefs_initialized)
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{
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dissector_handle_t bfcp_handle;
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heur_dissector_add("tcp", dissect_bfcp, proto_bfcp);
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heur_dissector_add("udp", dissect_bfcp, proto_bfcp);
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bfcp_handle = new_create_dissector_handle(dissect_bfcp, proto_bfcp);
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dissector_add_handle("tcp.port", bfcp_handle);
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dissector_add_handle("udp.port", bfcp_handle);
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prefs_initialized = TRUE;
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}
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heur_dissector_set_enabled("tcp", dissect_bfcp, proto_bfcp,
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bfcp_enable_heuristic_dissection);
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heur_dissector_set_enabled("udp", dissect_bfcp, proto_bfcp,
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bfcp_enable_heuristic_dissection);
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}
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