/*
 * ldap.c
 *
 * Copyright (C) 2009-2011 by ipoque GmbH
 * Copyright (C) 2011-18 - 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);
}

void ndpi_search_ldap(struct ndpi_detection_module_struct *ndpi_struct, struct ndpi_flow_struct *flow)
{
    struct ndpi_packet_struct *packet = &flow->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_packet_len >= 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;
            }
        }
    }

    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;
}

