76 lines
2.2 KiB
C++
76 lines
2.2 KiB
C++
/*
|
|
*
|
|
* Copyright (c) 2011-2016 The University of Waikato, Hamilton, New Zealand.
|
|
* All rights reserved.
|
|
*
|
|
* This file is part of libprotoident.
|
|
*
|
|
* This code has been developed by the University of Waikato WAND
|
|
* research group. For further information please see http://www.wand.net.nz/
|
|
*
|
|
* libprotoident is free software; you can redistribute it and/or modify
|
|
* it under the terms of the GNU Lesser General Public License as published by
|
|
* the Free Software Foundation; either version 3 of the License, or
|
|
* (at your option) any later version.
|
|
*
|
|
* libprotoident is distributed in the hope that it will be useful,
|
|
* but WITHOUT ANY WARRANTY; without even the implied warranty of
|
|
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
|
|
* GNU Lesser General Public License for more details.
|
|
*
|
|
* You should have received a copy of the GNU Lesser General Public License
|
|
* along with this program. If not, see <http://www.gnu.org/licenses/>.
|
|
*
|
|
*
|
|
*/
|
|
|
|
#include <string.h>
|
|
|
|
#include "libprotoident.h"
|
|
#include "proto_manager.h"
|
|
#include "proto_common.h"
|
|
|
|
static inline bool match_rtcp_payload(uint32_t payload, uint32_t len) {
|
|
if (len == 0)
|
|
return true;
|
|
if (MATCH(payload, 0x81, 0xc8, 0x00, ANY))
|
|
return true;
|
|
if (MATCH(payload, 0x81, 0xc9, 0x00, ANY))
|
|
return true;
|
|
if (MATCH(payload, 0x80, 0xc9, 0x00, ANY))
|
|
return true;
|
|
if (MATCH(payload, 0x80, 0xc8, 0x00, ANY))
|
|
return true;
|
|
return false;
|
|
}
|
|
|
|
|
|
static inline bool match_rtcp(lpi_data_t *data, lpi_module_t *mod UNUSED) {
|
|
|
|
/* Watch out for one-way DNS... */
|
|
if (data->payload_len[0] == 0 || data->payload_len[1] == 0) {
|
|
if (data->server_port == 53 || data->client_port == 53)
|
|
return false;
|
|
}
|
|
|
|
if (!match_rtcp_payload(data->payload[0], data->payload_len[0]))
|
|
return false;
|
|
if (!match_rtcp_payload(data->payload[1], data->payload_len[1]))
|
|
return false;
|
|
return true;
|
|
|
|
}
|
|
|
|
static lpi_module_t lpi_rtcp = {
|
|
LPI_PROTO_UDP_RTCP,
|
|
LPI_CATEGORY_VOIP,
|
|
"RTCP",
|
|
3,
|
|
match_rtcp
|
|
};
|
|
|
|
void register_rtcp(LPIModuleMap *mod_map) {
|
|
register_protocol(&lpi_rtcp, mod_map);
|
|
}
|
|
|