text: /*
   * ciscovpn.c
   * Copyright (C) 2013 by Remy Mudingay <mudingay@ill.fr>
   *
   */
  
  #include "ndpi_protocol_ids.h"
  
  #define NDPI_CURRENT_PROTO NDPI_PROTOCOL_CISCOVPN
  
  #include "ndpi_api.h"
  
  
  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, NDPI_PROTOCOL_UNKNOWN);
  }
  
  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_DBG(ndpi_struct, "search CISCOVPN\n");
  
      if(packet->tcp != NULL) {
          tsport = ntohs(packet->tcp->source), tdport = ntohs(packet->tcp->dest);
          NDPI_LOG_DBG2(ndpi_struct, "calculated CISCOVPN over tcp ports\n");
      }
      if(packet->udp != NULL) {
          usport = ntohs(packet->udp->source), udport = ntohs(packet->udp->dest);
          NDPI_LOG_DBG2(ndpi_struct, "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_INFO(ndpi_struct, "found CISCOVPN\n");
          ndpi_int_ciscovpn_add_connection(ndpi_struct, flow);
          return;
      }
      else if(((tsport == 443 || tdport == 443) ||
               (tsport == 80 || tdport == 80)) &&
              ((packet->payload[0] == 0x17 &&
                packet->payload[1] == 0x03 &&
                packet->payload[2] == 0x03 &&
                packet->payload[3] == 0x00 &&
                packet->payload[4] == 0x3A)))
      {
          /* TLS signature of Cisco AnyConnect 0X170303003A */
          NDPI_LOG_INFO(ndpi_struct, "found CISCO Anyconnect VPN\n");
          ndpi_int_ciscovpn_add_connection(ndpi_struct, flow);
          return;
      }
      else if(((tsport == 8009 || tdport == 8009) ||
               (tsport == 8008 || tdport == 8008)) &&
              ((packet->payload[0] == 0x17 &&
                packet->payload[1] == 0x03 &&
                packet->payload[2] == 0x03 &&
                packet->payload[3] == 0x00 &&
                packet->payload[4] == 0x69)))
      {
          /* TCP signature of Cisco AnyConnect 0X1703030069 */
          NDPI_LOG_INFO(ndpi_struct, "found CISCO Anyconnect VPN\n");
          ndpi_int_ciscovpn_add_connection(ndpi_struct, flow);
          return;
      }
      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_INFO(ndpi_struct, "found CISCOVPN\n");
          ndpi_int_ciscovpn_add_connection(ndpi_struct, flow);
      } else {
          NDPI_EXCLUDE_PROTO(ndpi_struct, flow);
      }
  
  }
  
  
  void init_ciscovpn_dissector(struct ndpi_detection_module_struct *ndpi_struct, u_int32_t *id, NDPI_PROTOCOL_BITMASK *detection_bitmask)
  {
      ndpi_set_bitmask_protocol_detection("CiscoVPN", ndpi_struct, detection_bitmask, *id,
                                          NDPI_PROTOCOL_CISCOVPN,
                                          ndpi_search_ciscovpn,
                                          NDPI_SELECTION_BITMASK_PROTOCOL_TCP_OR_UDP_WITH_PAYLOAD,
                                          SAVE_DETECTION_BITMASK_AS_UNKNOWN,
                                          ADD_TO_DETECTION_BITMASK);
      *id += 1;
  }
  