/*

 * haproxy.c

 *

 * Copyright (C) 2023 - 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_HAPROXY

#include "ndpi_api.h"

#include "ndpi_private.h"

static void ndpi_int_haproxy_add_connection(struct ndpi_detection_module_struct *ndpi_struct, struct ndpi_flow_struct *flow)

{

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

}

static void ndpi_search_haproxy(struct ndpi_detection_module_struct *ndpi_struct,

                                struct ndpi_flow_struct *flow)

{

  struct ndpi_packet_struct *packet = &ndpi_struct->packet;

  const uint8_t *haproxy_end;

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

  if (packet->payload_packet_len < NDPI_STATICSTRING_LEN("PROXY TCP"))

  {

    NDPI_EXCLUDE_DISSECTOR(ndpi_struct, flow);

    return;

  }

  if (strncmp((char *)packet->payload, "PROXY TCP", NDPI_STATICSTRING_LEN("PROXY TCP")) != 0)

  {

    NDPI_EXCLUDE_DISSECTOR(ndpi_struct, flow);

    return;

  }

  /* The following code may be also used in the future to call subprotocol dissectors e.g. TLS. */

  haproxy_end = (uint8_t *)ndpi_strnstr((char *)packet->payload, "\r\n", packet->payload_packet_len);

  if (haproxy_end == NULL)

  {

    NDPI_EXCLUDE_DISSECTOR(ndpi_struct, flow);

    return;

  }

  haproxy_end += 2;

  if (packet->payload_packet_len - (haproxy_end - packet->payload) == 0)

  {

    NDPI_EXCLUDE_DISSECTOR(ndpi_struct, flow);

    return;

  }

  ndpi_int_haproxy_add_connection(ndpi_struct, flow);

}

void init_haproxy_dissector(struct ndpi_detection_module_struct *ndpi_struct)

{

  register_dissector("HAProxy", ndpi_struct,

                     ndpi_search_haproxy,

                     NDPI_SELECTION_BITMASK_PROTOCOL_V4_V6_TCP_WITH_PAYLOAD_WITHOUT_RETRANSMISSION,

                     1, NDPI_PROTOCOL_HAPROXY);

}