text: /*
   *
   * Copyright (c) 2011-2016 The University of Waikato, Hamilton, New Zealand.
   * All rights reserved.
   *
   * This file is part of libprotoident.
   *
   * This code has been developed by the University of Waikato WAND
   * research group. For further information please see http://www.wand.net.nz/
   *
   * libprotoident 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.
   *
   * libprotoident 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 this program.  If not, see <http://www.gnu.org/licenses/>.
   *
   *
   */
  
  #include <string.h>
  
  #include "libprotoident.h"
  #include "proto_manager.h"
  #include "proto_common.h"
  
  static inline bool match_slp_req(uint32_t payload, uint32_t len) {
  
          /* According to RFC 2608, the 3rd and 4th bytes should be the 
           * length (including the SLP header). This doesn't appear to be the
           * case with any of the port 427 traffic I've seen, so either I'm
           * wrong or people fail at following RFCs */
  
          if (MATCH(payload, 0x02, 0x01, 0x00, 0x00) && len == 49) {
                  return true;
          }
  
          return false;
  
  }
  
  static inline bool match_slp_resp(uint32_t payload, uint32_t len) {
  
          /* I haven't actually observed any responses yet, so just going
           * on what the spec says :/ */
  
          if (len == 0)
                  return true;
  
          if (MATCH(payload, 0x02, 0x02, ANY, ANY)) {
                  return true;
          }
  
          return false;
  }
  
  
  static inline bool match_slp(lpi_data_t *data, lpi_module_t *mod UNUSED) {
  
  	if (data->server_port != 427 && data->client_port != 427)
                  return false;
  
          if (match_slp_req(data->payload[0], data->payload_len[0])) {
                  if (match_slp_resp(data->payload[1], data->payload_len[1]))
                          return true;
                  return false;
          }
  
          if (match_slp_req(data->payload[1], data->payload_len[1])) {
                  if (match_slp_resp(data->payload[0], data->payload_len[0]))
                          return true;
                  return false;
          }
  
  
  	return false;
  }
  
  static lpi_module_t lpi_slp = {
  	LPI_PROTO_UDP_SLP,
  	LPI_CATEGORY_SERVICES,
  	"SLP",
  	5,
  	match_slp
  };
  
  void register_slp(LPIModuleMap *mod_map) {
  	register_protocol(&lpi_slp, mod_map);
  }
  
  