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


#include "ndpi_protocols.h"
#ifdef NDPI_PROTOCOL_CISCOVPN

static void ndpi_int_ciscovpn_add_connection(struct ndpi_detection_module_struct *ndpi_struct, struct ndpi_flow_struct *flow)
{
  ndpi_set_detected_protocol(ndpi_struct, flow, NDPI_PROTOCOL_CISCOVPN);
}

void ndpi_search_ciscovpn(struct ndpi_detection_module_struct *ndpi_struct, struct ndpi_flow_struct *flow)
{
  struct ndpi_packet_struct *packet = &flow->packet;
  u_int16_t udport = 0, usport = 0;
  u_int16_t tdport = 0, tsport = 0;


  NDPI_LOG(NDPI_PROTOCOL_CISCOVPN, ndpi_struct, NDPI_LOG_DEBUG, "search CISCOVPN.\n");

  if(packet->tcp != NULL) {
    tsport = ntohs(packet->tcp->source), tdport = ntohs(packet->tcp->dest);
    NDPI_LOG(NDPI_PROTOCOL_CISCOVPN, ndpi_struct, NDPI_LOG_DEBUG, "calculated CISCOVPN over tcp ports.\n");
  }
  if(packet->udp != NULL) {
    usport = ntohs(packet->udp->source), udport = ntohs(packet->udp->dest);
    NDPI_LOG(NDPI_PROTOCOL_CISCOVPN, ndpi_struct, NDPI_LOG_DEBUG, "calculated CISCOVPN over udp ports.\n");
  }

  if((tdport == 10000 && tsport == 10000) ||
     ((tsport == 443 || tdport == 443) &&
      (packet->payload[0] == 0x17 &&
       packet->payload[1] == 0x01 &&
       packet->payload[2] == 0x00 &&
       packet->payload[3] == 0x00)
      )
     )

    {
      /* This is a good query  17010000*/
      NDPI_LOG(NDPI_PROTOCOL_CISCOVPN, ndpi_struct, NDPI_LOG_DEBUG, "found CISCOVPN.\n");
      ndpi_int_ciscovpn_add_connection(ndpi_struct, flow);
    } 
  else if(
	  (
	   (usport == 10000 && udport == 10000)
	   &&
	   (packet->payload[0] == 0xfe &&
	    packet->payload[1] == 0x57 &&
	    packet->payload[2] == 0x7e &&
	    packet->payload[3] == 0x2b)
	   )
	  )
    {


      /* This is a good query  fe577e2b */
      NDPI_LOG(NDPI_PROTOCOL_CISCOVPN, ndpi_struct, NDPI_LOG_DEBUG, "found CISCOVPN.\n");
      ndpi_int_ciscovpn_add_connection(ndpi_struct, flow);
    } else {
    NDPI_LOG(NDPI_PROTOCOL_CISCOVPN, ndpi_struct, NDPI_LOG_DEBUG, "exclude CISCOVPN.\n");
    NDPI_ADD_PROTOCOL_TO_BITMASK(flow->excluded_protocol_bitmask, NDPI_PROTOCOL_CISCOVPN);
  }

}
#endif