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/*
* drda.c
*
* Copyright (C) 2012-22 - ntop.org
*
* This module 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.
*
* This module 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.
* If not, see <http://www.gnu.org/licenses/>.
*
*/
#include "ndpi_protocol_ids.h"
#define NDPI_CURRENT_PROTO NDPI_PROTOCOL_DRDA
#include "ndpi_api.h"
struct ndpi_drda_hdr {
u_int16_t length;
u_int8_t magic;
u_int8_t format;
u_int16_t correlID;
u_int16_t length2;
u_int16_t code_pnt;
};
void ndpi_search_drda(struct ndpi_detection_module_struct *ndpi_struct,
struct ndpi_flow_struct *flow)
{
struct ndpi_packet_struct * packet = &ndpi_struct->packet;
u_int16_t payload_len = packet->payload_packet_len;
u_int count = 0; // prevent integer overflow
NDPI_LOG_DBG(ndpi_struct, "search DRDA\n");
if(packet->tcp != NULL) {
/* check port */
if(payload_len >= sizeof(struct ndpi_drda_hdr)) {
struct ndpi_drda_hdr * drda = (struct ndpi_drda_hdr *) packet->payload;
u_int16_t len = ntohs(drda->length);
/* check first header */
if(len != ntohs(drda->length2) + 6 ||
drda->magic != 0xd0)
goto no_drda;
/* check if there are more drda headers */
if(payload_len > len) {
count = len;
while(count + sizeof(struct ndpi_drda_hdr) < payload_len)
{
/* update info */
drda = (struct ndpi_drda_hdr *)(packet->payload + count);
len = ntohs(drda->length);
if(len != ntohs(drda->length2) + 6 ||
drda->magic != 0xd0)
goto no_drda;
count += len;
}
if(count != payload_len) goto no_drda;
}
NDPI_LOG_INFO(ndpi_struct, "found DRDA\n");
ndpi_set_detected_protocol(ndpi_struct, flow, NDPI_PROTOCOL_DRDA, NDPI_PROTOCOL_UNKNOWN, NDPI_CONFIDENCE_DPI);
return;
}
}
no_drda:
NDPI_EXCLUDE_PROTO(ndpi_struct, flow);
}
/* ***************************************************************** */
void init_drda_dissector(struct ndpi_detection_module_struct *ndpi_struct, u_int32_t *id,
NDPI_PROTOCOL_BITMASK *detection_bitmask)
{
ndpi_set_bitmask_protocol_detection("DRDA", ndpi_struct, detection_bitmask, *id,
NDPI_PROTOCOL_DRDA,
ndpi_search_drda,
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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