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/*
* wsd.c
*
* Copyright (C) 2018-22 - ntop.org
*
* nDPI 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.
*
* nDPI 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 nDPI. If not, see <http://www.gnu.org/licenses/>.
*
*/
/* https://en.wikipedia.org/wiki/WS-Discovery */
#include "ndpi_protocol_ids.h"
#define NDPI_CURRENT_PROTO NDPI_PROTOCOL_WSD
#include "ndpi_api.h"
#include "ndpi_private.h"
#define WSD_PORT 3702
static void ndpi_search_wsd(struct ndpi_detection_module_struct *ndpi_struct,
struct ndpi_flow_struct *flow) {
struct ndpi_packet_struct *packet = &ndpi_struct->packet;
NDPI_LOG_DBG(ndpi_struct, "search wsd\n");
if(packet->udp
&& (
(packet->iph && ((ntohl(packet->iph->daddr) & 0xF0000000) == 0xE0000000 /* A multicast address */))
||
(packet->iphv6 && ntohl(packet->iphv6->ip6_dst.u6_addr.u6_addr32[0]) == 0xFF020000)
)
&& (ntohs(packet->udp->dest) == WSD_PORT)
&& (packet->payload_packet_len >= 40)
&& (strncmp((char*)packet->payload, "<?xml", 5) == 0)
) {
NDPI_LOG_INFO(ndpi_struct,"found wsd\n");
ndpi_set_detected_protocol(ndpi_struct, flow, NDPI_PROTOCOL_WSD, NDPI_PROTOCOL_UNKNOWN, NDPI_CONFIDENCE_DPI);
} else {
NDPI_EXCLUDE_PROTO(ndpi_struct, flow);
}
}
void init_wsd_dissector(struct ndpi_detection_module_struct *ndpi_struct, u_int32_t *id) {
ndpi_set_bitmask_protocol_detection("WSD", ndpi_struct, *id,
NDPI_PROTOCOL_WSD,
ndpi_search_wsd,
NDPI_SELECTION_BITMASK_PROTOCOL_V4_V6_UDP_WITH_PAYLOAD,
SAVE_DETECTION_BITMASK_AS_UNKNOWN,
ADD_TO_DETECTION_BITMASK);
*id += 1;
}
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