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/*
* vnc.c
*
* Copyright (C) 2016-22 - ntop.org
*
* This file is part of nDPI, an open source deep packet inspection
* library based on the OpenDPI and PACE technology by ipoque GmbH
*
* 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/>.
*
*/
#include "ndpi_protocol_ids.h"
#define NDPI_CURRENT_PROTO NDPI_PROTOCOL_VNC
#include "ndpi_api.h"
void ndpi_search_vnc_tcp(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 vnc\n");
/* search over TCP */
if(packet->tcp) {
if(flow->l4.tcp.vnc_stage == 0) {
if((packet->payload_packet_len == 12) &&
(((memcmp(packet->payload, "RFB 003.", 7) == 0) && (packet->payload[11] == 0x0a))
||
((memcmp(packet->payload, "RFB 004.", 7) == 0) && (packet->payload[11] == 0x0a)))) {
NDPI_LOG_DBG2(ndpi_struct, "reached vnc stage one\n");
flow->l4.tcp.vnc_stage = 1 + packet->packet_direction;
return;
}
} else if(flow->l4.tcp.vnc_stage == 2 - packet->packet_direction) {
if((packet->payload_packet_len == 12) &&
(((memcmp(packet->payload, "RFB 003.", 7) == 0) && (packet->payload[11] == 0x0a))
||
((memcmp(packet->payload, "RFB 004.", 7) == 0) && (packet->payload[11] == 0x0a)))) {
NDPI_LOG_INFO(ndpi_struct, "found vnc\n");
ndpi_set_detected_protocol(ndpi_struct, flow, NDPI_PROTOCOL_VNC, NDPI_PROTOCOL_UNKNOWN, NDPI_CONFIDENCE_DPI);
ndpi_set_risk(ndpi_struct, flow, NDPI_DESKTOP_OR_FILE_SHARING_SESSION); /* Remote assistance */
return;
}
}
}
NDPI_EXCLUDE_PROTO(ndpi_struct, flow);
}
void init_vnc_dissector(struct ndpi_detection_module_struct *ndpi_struct, u_int32_t *id, NDPI_PROTOCOL_BITMASK *detection_bitmask)
{
ndpi_set_bitmask_protocol_detection("VNC", ndpi_struct, detection_bitmask, *id,
NDPI_PROTOCOL_VNC,
ndpi_search_vnc_tcp,
NDPI_SELECTION_BITMASK_PROTOCOL_V4_V6_TCP_WITH_PAYLOAD_WITHOUT_RETRANSMISSION,
SAVE_DETECTION_BITMASK_AS_UNKNOWN,
ADD_TO_DETECTION_BITMASK);
*id += 1;
}
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