/*

 * ookla.c

 *

 * Copyright (C) 2018-22 - 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/>.

 *

 */

#include "ndpi_protocol_ids.h"

#define NDPI_CURRENT_PROTO NDPI_PROTOCOL_OOKLA

#include "ndpi_api.h"

#include "ndpi_private.h"

/* #define DEBUG_OOKLA_LRU */

const u_int16_t ookla_port = 8080;

/* ************************************************************* */

static u_int64_t get_ookla_key(struct ndpi_flow_struct *flow)

{

  if(flow->is_ipv6)

    return ndpi_quick_hash64((const char *)flow->c_address.v6, 16);

  else

    return flow->c_address.v4;

}

/* ************************************************************* */

int ookla_search_into_cache(struct ndpi_detection_module_struct *ndpi_struct,

                            struct ndpi_flow_struct *flow)

{

  u_int64_t key;

  u_int16_t dummy;

  if(ndpi_struct->ookla_cache) {

    key = get_ookla_key(flow);

    if(ndpi_lru_find_cache(ndpi_struct->ookla_cache, key,

                           &dummy, 0 /* Don't remove it as it can be used for other connections */,

         ndpi_get_current_time(flow))) {

#ifdef DEBUG_OOKLA_LRU

      printf("[LRU OOKLA] Found %lu [%u <-> %u]\n", key, ntohs(flow->c_port), ntohs(flow->s_port));

#endif

      return 1;

    } else {

#ifdef DEBUG_OOKLA_LRU

      printf("[LRU OOKLA] Not found %lu [%u <-> %u]\n", key, ntohs(flow->c_port), ntohs(flow->s_port));

#endif

    }      

  }

  return 0;

}

/* ************************************************************* */

void ookla_add_to_cache(struct ndpi_detection_module_struct *ndpi_struct,

                        struct ndpi_flow_struct *flow)

{

  u_int64_t key;

  if(ndpi_struct->ookla_cache) {

    key = get_ookla_key(flow);

#ifdef DEBUG_OOKLA_LRU

    printf("[LRU OOKLA] ADDING %lu [%u <-> %u]\n", key, ntohs(flow->c_port), ntohs(flow->s_port));

#endif

    ndpi_lru_add_to_cache(ndpi_struct->ookla_cache, key, 1 /* dummy */,

                          ndpi_get_current_time(flow));

  }

}

/* ************************************************************* */

void ndpi_search_ookla(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, "Ookla detection\n");

  if(ntohs(flow->s_port) != ookla_port && ntohs(flow->c_port) != ookla_port) {

    NDPI_EXCLUDE_DISSECTOR(ndpi_struct, flow);

    return;

  }

  if(flow->packet_counter == 1 &&

     packet->payload_packet_len >= NDPI_STATICSTRING_LEN("HI") &&

     memcmp(packet->payload, "HI", NDPI_STATICSTRING_LEN("HI")) == 0) {

    flow->ookla_stage = 1;

    return;

  }

  if(flow->packet_counter == 2 &&

     flow->ookla_stage == 1 &&

     packet->payload_packet_len >= NDPI_STATICSTRING_LEN("HELLO") &&

     memcmp(packet->payload, "HELLO", NDPI_STATICSTRING_LEN("HELLO")) == 0) {

    NDPI_LOG_INFO(ndpi_struct, "found ookla (Hi + Hello)\n");

    ndpi_set_detected_protocol(ndpi_struct, flow, NDPI_PROTOCOL_OOKLA, NDPI_PROTOCOL_UNKNOWN, NDPI_CONFIDENCE_DPI);

    ookla_add_to_cache(ndpi_struct, flow);

    return;

  }

  NDPI_EXCLUDE_DISSECTOR(ndpi_struct, flow);

}

/* ************************************************************* */

void init_ookla_dissector(struct ndpi_detection_module_struct *ndpi_struct) {

  register_dissector("Ookla", ndpi_struct,

                     ndpi_search_ookla,

                     NDPI_SELECTION_BITMASK_PROTOCOL_V4_V6_TCP_OR_UDP_WITH_PAYLOAD_WITHOUT_RETRANSMISSION,

                     1, NDPI_PROTOCOL_OOKLA);

}