/*
 * ldap.c
 *
 * Copyright (C) 2009-11 - ipoque GmbH
 * Copyright (C) 2011-22 - 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_LDAP

#include "ndpi_api.h"


static void ndpi_int_ldap_add_connection(struct ndpi_detection_module_struct *ndpi_struct,
					 struct ndpi_flow_struct *flow)
{
  ndpi_set_detected_protocol(ndpi_struct, flow, NDPI_PROTOCOL_LDAP, NDPI_PROTOCOL_UNKNOWN, NDPI_CONFIDENCE_DPI);
}

void ndpi_search_ldap(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 ldap\n");

	if (packet->payload_packet_len >= 14 && packet->payload[0] == 0x30) {

		// simple type
		if (packet->payload[1] == 0x0c && packet->payload_packet_len == 14 &&
			packet->payload[packet->payload_packet_len - 1] == 0x00 && packet->payload[2] == 0x02) {

			if (packet->payload[3] == 0x01 &&
				(packet->payload[5] == 0x60 || packet->payload[5] == 0x61) && packet->payload[6] == 0x07) {
				NDPI_LOG_INFO(ndpi_struct, "found ldap simple type 1\n");
				ndpi_int_ldap_add_connection(ndpi_struct, flow);
				return;
			}

			if (packet->payload[3] == 0x02 &&
				(packet->payload[6] == 0x60 || packet->payload[6] == 0x61) && packet->payload[7] == 0x07) {
				NDPI_LOG_INFO(ndpi_struct, "found ldap simple type 2\n");
				ndpi_int_ldap_add_connection(ndpi_struct, flow);
				return;
			}
		}
		// normal type
		if (packet->payload[1] == 0x84 &&
			packet->payload[2] == 0x00 && packet->payload[3] == 0x00 && packet->payload[6] == 0x02) {

			if (packet->payload[7] == 0x01 &&
				(packet->payload[9] == 0x60 || packet->payload[9] == 0x61 || packet->payload[9] == 0x63 ||
				 packet->payload[9] == 0x64) && packet->payload[10] == 0x84) {

				NDPI_LOG_INFO(ndpi_struct, "found ldap type 1\n");
				ndpi_int_ldap_add_connection(ndpi_struct, flow);
				return;
			}

			if (packet->payload[7] == 0x02 &&
				(packet->payload[10] == 0x60 || packet->payload[10] == 0x61 || packet->payload[10] == 0x63 ||
				 packet->payload[10] == 0x64) && packet->payload[11] == 0x84) {

				NDPI_LOG_INFO(ndpi_struct, "found ldap type 2\n");
				ndpi_int_ldap_add_connection(ndpi_struct, flow);
				return;
			}

			if (packet->payload[7] == 0x03 &&
				(packet->payload[11] == 0x60 || packet->payload[11] == 0x61 || packet->payload[11] == 0x63 ||
				 packet->payload[11] == 0x64 || packet->payload[11] == 0x65) && packet->payload[12] == 0x84) {

				NDPI_LOG_INFO(ndpi_struct, "found ldap type 3\n");
				ndpi_int_ldap_add_connection(ndpi_struct, flow);
				return;
			}
		}
	}


	NDPI_EXCLUDE_PROTO(ndpi_struct, flow);
}


void init_ldap_dissector(struct ndpi_detection_module_struct *ndpi_struct, u_int32_t *id, NDPI_PROTOCOL_BITMASK *detection_bitmask)
{
  ndpi_set_bitmask_protocol_detection("LDAP", ndpi_struct, detection_bitmask, *id,
				      NDPI_PROTOCOL_LDAP,
				      ndpi_search_ldap,
				      NDPI_SELECTION_BITMASK_PROTOCOL_V4_V6_TCP_OR_UDP_WITH_PAYLOAD_WITHOUT_RETRANSMISSION,
				      SAVE_DETECTION_BITMASK_AS_UNKNOWN,
				      ADD_TO_DETECTION_BITMASK);

  *id += 1;
}