text: /*
   * FreeRTOS+TCP V2.0.10
   * Copyright (C) 2017 Amazon.com, Inc. or its affiliates.  All Rights Reserved.
   *
   * Permission is hereby granted, free of charge, to any person obtaining a copy of
   * this software and associated documentation files (the "Software"), to deal in
   * the Software without restriction, including without limitation the rights to
   * use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies of
   * the Software, and to permit persons to whom the Software is furnished to do so,
   * subject to the following conditions:
   *
   * The above copyright notice and this permission notice shall be included in all
   * copies or substantial portions of the Software.
   *
   * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
   * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS
   * FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR
   * COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER
   * IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
   * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
   *
   * http://aws.amazon.com/freertos
   * http://www.FreeRTOS.org
   */
  
  #ifndef FREERTOS_DNS_H
  #define FREERTOS_DNS_H
  
  #ifdef __cplusplus
  extern "C" {
  #endif
  
  /* Application level configuration options. */
  #include "FreeRTOSIPConfig.h"
  #include "IPTraceMacroDefaults.h"
  
  
  /* The Link-local Multicast Name Resolution (LLMNR)
   * is included.
   * Note that a special MAC address is required in addition to the NIC's actual
   * MAC address: 01:00:5E:00:00:FC
   *
   * The target IP address will be 224.0.0.252
   */
  #if( ipconfigBYTE_ORDER == pdFREERTOS_BIG_ENDIAN )
  	#define	ipLLMNR_IP_ADDR			0xE00000FC
  #else
  	#define	ipLLMNR_IP_ADDR			0xFC0000E0
  #endif /* ipconfigBYTE_ORDER == pdFREERTOS_BIG_ENDIAN */
  
  #define	ipLLMNR_PORT	5355 /* Standard LLMNR port. */
  #define	ipDNS_PORT		53	/* Standard DNS port. */
  #define	ipDHCP_CLIENT	67
  #define	ipDHCP_SERVER	68
  #define	ipNBNS_PORT		137	/* NetBIOS Name Service. */
  #define	ipNBDGM_PORT	138 /* Datagram Service, not included. */
  
  /*
   * The following function should be provided by the user and return true if it
   * matches the domain name.
   */
  extern BaseType_t xApplicationDNSQueryHook( const char *pcName );
  
  /*
   * LLMNR is very similar to DNS, so is handled by the DNS routines.
   */
  uint32_t ulDNSHandlePacket( NetworkBufferDescriptor_t *pxNetworkBuffer );
  
  #if( ipconfigUSE_LLMNR == 1 )
  	extern const MACAddress_t xLLMNR_MacAdress;
  #endif /* ipconfigUSE_LLMNR */
  
  #if( ipconfigUSE_NBNS != 0 )
  
  	/*
  	 * Inspect a NetBIOS Names-Service message.  If the name matches with ours
  	 * (xApplicationDNSQueryHook returns true) an answer will be sent back.
  	 * Note that LLMNR is a better protocol for name services on a LAN as it is
  	 * less polluted
  	 */
  	uint32_t ulNBNSHandlePacket (NetworkBufferDescriptor_t *pxNetworkBuffer );
  
  #endif /* ipconfigUSE_NBNS */
  
  #if( ipconfigUSE_DNS_CACHE != 0 )
  
      /* Look for the indicated host name in the DNS cache. Returns the IPv4 
      address if present, or 0x0 otherwise. */
  	uint32_t FreeRTOS_dnslookup( const char *pcHostName );
  
      /* Remove all entries from the DNS cache. */
      void FreeRTOS_dnsclear();
  #endif /* ipconfigUSE_DNS_CACHE != 0 */
  
  #if( ipconfigDNS_USE_CALLBACKS != 0 )
  
  	/*
  	 * Users may define this type of function as a callback.
  	 * It will be called when a DNS reply is received or when a timeout has been reached.
  	 */
  	typedef void (* FOnDNSEvent ) ( const char * /* pcName */, void * /* pvSearchID */, uint32_t /* ulIPAddress */ );
  
  	/*
  	 * Asynchronous version of gethostbyname()
  	 * xTimeout is in units of ms.
  	 */
  	uint32_t FreeRTOS_gethostbyname_a( const char *pcHostName, FOnDNSEvent pCallback, void *pvSearchID, TickType_t xTimeout );
  	void FreeRTOS_gethostbyname_cancel( void *pvSearchID );
  
  #endif
  
  /*
   * FULL, UP-TO-DATE AND MAINTAINED REFERENCE DOCUMENTATION FOR ALL THESE
   * FUNCTIONS IS AVAILABLE ON THE FOLLOWING URL:
   * _TBD_ Add URL
   */
  uint32_t FreeRTOS_gethostbyname( const char *pcHostName );
  
  
  #ifdef __cplusplus
  }	/* extern "C" */
  #endif
  
  #endif /* FREERTOS_DNS_H */
  
  
  
  
  
  
  
  
  
  
  
  
  
  