/*
 * oracle.c
 *
 * Copyright (C) 2013 Remy Mudingay <mudingay@ill.fr>
 *
 * 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_ORACLE

#include "ndpi_api.h"

static void ndpi_int_oracle_add_connection(struct ndpi_detection_module_struct
        *ndpi_struct, struct ndpi_flow_struct *flow)
{
    ndpi_set_detected_protocol(ndpi_struct, flow, NDPI_PROTOCOL_ORACLE);
}

void ndpi_search_oracle(struct ndpi_detection_module_struct *ndpi_struct, struct ndpi_flow_struct *flow)
{
    struct ndpi_packet_struct *packet = &flow->packet;
    u_int16_t dport = 0, sport = 0;

    NDPI_LOG_DBG(ndpi_struct, "search ORACLE\n");

    if(packet->tcp != NULL) {
        sport = ntohs(packet->tcp->source), dport = ntohs(packet->tcp->dest);
        NDPI_LOG_DBG2(ndpi_struct, "calculating ORACLE over tcp\n");
        /* Oracle Database 9g,10g,11g */
        if ((dport == 1521 || sport == 1521)
                &&  (((packet->payload[0] == 0x07) && (packet->payload[1] == 0xff) && (packet->payload[2] == 0x00))
                    || ((packet->payload_packet_len >= 232) && ((packet->payload[0] == 0x00) || (packet->payload[0] == 0x01))
                        && (packet->payload[1] != 0x00)
                        && (packet->payload[2] == 0x00)
                        && (packet->payload[3] == 0x00)))) {
            NDPI_LOG_INFO(ndpi_struct, "found oracle\n");
            ndpi_int_oracle_add_connection(ndpi_struct, flow);
        } else if (packet->payload_packet_len == 213 && packet->payload[0] == 0x00 &&
                packet->payload[1] == 0xd5 && packet->payload[2] == 0x00 &&
                packet->payload[3] == 0x00 ) {
            NDPI_LOG_INFO(ndpi_struct, "found oracle\n");
            ndpi_int_oracle_add_connection(ndpi_struct, flow);
        }
    } else {
        NDPI_EXCLUDE_PROTO(ndpi_struct, flow);
    }
}


void init_oracle_dissector(struct ndpi_detection_module_struct *ndpi_struct, u_int32_t *id, NDPI_PROTOCOL_BITMASK *detection_bitmask)
{
    ndpi_set_bitmask_protocol_detection("Oracle", ndpi_struct, detection_bitmask, *id,
            NDPI_PROTOCOL_ORACLE,
            ndpi_search_oracle,
            NDPI_SELECTION_BITMASK_PROTOCOL_V4_V6_TCP_WITH_PAYLOAD_WITHOUT_RETRANSMISSION,
            SAVE_DETECTION_BITMASK_AS_UNKNOWN,
            ADD_TO_DETECTION_BITMASK);

    *id += 1;
}
