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/*
* cip.c
*
* Copyright (C) 2018-24 - 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/Common_Industrial_Protocol */
#include "ndpi_protocol_ids.h"
#define NDPI_CURRENT_PROTO NDPI_PROTOCOL_CIP
#define CIP_IO_PORT 2222
#include "ndpi_api.h"
#include "ndpi_private.h"
static void ndpi_search_cip(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 cip\n");
if(packet->udp
&& (ntohs(packet->udp->source) == CIP_IO_PORT) && (ntohs(packet->udp->dest) == CIP_IO_PORT)
&& (packet->payload_packet_len >= 12)
&& (packet->payload_packet_len < 64)
&& (packet->payload[1] == 0x0)
) {
u_int8_t num_items = packet->payload[0], offset = 2;
while((num_items > 0) && (packet->payload_packet_len > ((u_int32_t)offset + 4))) {
// u_int16_t type_id = *((u_int16_t*)&packet->payload[offset]);
u_int16_t lenght = (packet->payload[offset+3] << 8) + packet->payload[offset+2];
offset += 4 + lenght;
num_items--;
}
if(offset == packet->payload_packet_len) {
NDPI_LOG_INFO(ndpi_struct,"found cip\n");
ndpi_set_detected_protocol(ndpi_struct, flow, NDPI_PROTOCOL_CIP, NDPI_PROTOCOL_UNKNOWN, NDPI_CONFIDENCE_DPI);
}
} else {
/* TODO add TCP dissection */
}
NDPI_EXCLUDE_PROTO(ndpi_struct, flow);
}
void init_cip_dissector(struct ndpi_detection_module_struct *ndpi_struct, u_int32_t *id) {
ndpi_set_bitmask_protocol_detection("CIP", ndpi_struct, *id,
NDPI_PROTOCOL_CIP,
ndpi_search_cip,
NDPI_SELECTION_BITMASK_PROTOCOL_V4_V6_UDP_WITH_PAYLOAD,
SAVE_DETECTION_BITMASK_AS_UNKNOWN,
ADD_TO_DETECTION_BITMASK);
*id += 1;
}
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