/*
 * http_activesync.c
 *
 * Copyright (C) 2009-2011 by ipoque GmbH
 * Copyright (C) 2011-19 - 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_HTTP_ACTIVESYNC

#include "ndpi_api.h"

static void ndpi_int_activesync_add_connection(struct ndpi_detection_module_struct *ndpi_struct, struct ndpi_flow_struct *flow)
{
  ndpi_set_detected_protocol(ndpi_struct, flow, NDPI_PROTOCOL_HTTP_ACTIVESYNC, NDPI_PROTOCOL_HTTP);
}

void ndpi_search_activesync(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 activesync\n");
  if (packet->tcp != NULL) {

    if (packet->payload_packet_len > 150
	&& ((memcmp(packet->payload, "OPTIONS /Microsoft-Server-ActiveSync?", 37) == 0)
	    || (memcmp(packet->payload, "POST /Microsoft-Server-ActiveSync?", 34) == 0))) {
      ndpi_int_activesync_add_connection(ndpi_struct, flow);
      NDPI_LOG_INFO(ndpi_struct, "found ActiveSync \n");
      return;
    }
  }

  NDPI_EXCLUDE_PROTO(ndpi_struct, flow);
}

void init_http_activesync_dissector(struct ndpi_detection_module_struct *ndpi_struct,
				    u_int32_t *id, NDPI_PROTOCOL_BITMASK *detection_bitmask)
{
  ndpi_set_bitmask_protocol_detection("HTTP_Application_ActiveSync", ndpi_struct, detection_bitmask, *id,
				      NDPI_PROTOCOL_HTTP_ACTIVESYNC,
				      ndpi_search_activesync,
				      NDPI_SELECTION_BITMASK_PROTOCOL_V4_V6_TCP_WITH_PAYLOAD_WITHOUT_RETRANSMISSION,
				      SAVE_DETECTION_BITMASK_AS_UNKNOWN,
				      ADD_TO_DETECTION_BITMASK);

  *id += 1;
}