/*
 *
 * (C) 2013-23 - ntop.org
 *
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation; either version 3 of the License, or
 * (at your option) any later version.
 *
 * This program 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 General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program; if not, write to the Free Software Foundation,
 * Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
 *
 */

#ifndef _MDNS_H_
#define _MDNS_H_

#include "ntop_includes.h"

class NetworkInterface;

/* ******************************* */

class MDNS {
 private:
  int udp_sock, batch_udp_sock;
  u_int32_t gatewayIPv4;
  bool sentAnyQuery;
  pthread_t resolverCheck;

  u_int16_t buildMDNSRequest(char *query, u_int8_t query_type, char *mdnsbuf,
                             u_int mdnsbuf_len, u_int16_t tid);

  u_int16_t prepareIPv4ResolveQuery(u_int32_t ipv4addr /* network byte order */,
                                    char *mdnsbuf, u_int mdnsbuf_len,
                                    u_int16_t tid = 0);
  u_int16_t prepareAnyQuery(char *query, char *mdnsbuf, u_int mdnsbuf_len,
                            u_int16_t tid = 0);
  char *decodePTRResponse(char *mdnsbuf, u_int mdnsbuf_len, char *buf,
                          u_int buf_len, u_int32_t *resolved_ip);
  char *decodeAnyResponse(char *mdnsbuf, u_int mdnsbuf_len, char *buf,
                          u_int buf_len);
  char *decodeNetBIOS(u_char *buf, u_int buf_len, char *out, u_int out_len);

 public:
  MDNS(NetworkInterface *iface);
  ~MDNS();

  void initializeResolver();

  /* Batch interface (via Lua) */
  bool sendAnyQuery(char *targetIPv4, char *query);
  bool queueResolveIPv4(u_int32_t ipv4addr, bool alsoUseGatewayDNS);
  void fetchResolveResponses(lua_State *vm, int32_t timeout_sec);
};

#endif /* _MDNS_H_ */