dns_client.h

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#ifndef _DNS_CLIENT_H
#define _DNS_CLIENT_H
 
//Dependencies
#include "core/net.h"
#include "core/socket.h"
#include "core/udp.h"
#include "dns/dns_cache.h"
 
//DNS client support
#ifndef DNS_CLIENT_SUPPORT
   #define DNS_CLIENT_SUPPORT ENABLED
#elif (DNS_CLIENT_SUPPORT != ENABLED && DNS_CLIENT_SUPPORT != DISABLED)
   #error DNS_CLIENT_SUPPORT parameter is not valid
#endif
 
//Maximum number of retransmissions of DNS queries
#ifndef DNS_CLIENT_MAX_RETRIES
   #define DNS_CLIENT_MAX_RETRIES 3
#elif (DNS_CLIENT_MAX_RETRIES < 1)
   #error DNS_CLIENT_MAX_RETRIES parameter is not valid
#endif
 
//Initial retransmission timeout
#ifndef DNS_CLIENT_INIT_TIMEOUT
   #define DNS_CLIENT_INIT_TIMEOUT 1000
#elif (DNS_CLIENT_INIT_TIMEOUT < 1000)
   #error DNS_CLIENT_INIT_TIMEOUT parameter is not valid
#endif
 
//Maximum retransmission timeout
#ifndef DNS_CLIENT_MAX_TIMEOUT
   #define DNS_CLIENT_MAX_TIMEOUT 5000
#elif (DNS_CLIENT_MAX_TIMEOUT < 1000)
   #error DNS_CLIENT_MAX_TIMEOUT parameter is not valid
#endif
 
//Minimum cache lifetime for DNS entries
#ifndef DNS_MIN_LIFETIME
   #define DNS_MIN_LIFETIME 1000
#elif (DNS_MIN_LIFETIME < 0)
   #error DNS_MIN_LIFETIME parameter is not valid
#endif
 
//Maximum cache lifetime for DNS entries
#ifndef DNS_MAX_LIFETIME
   #define DNS_MAX_LIFETIME 3600000
#elif (DNS_MAX_LIFETIME < 1000 || DNS_MAX_LIFETIME < DNS_MIN_LIFETIME)
   #error DNS_MAX_LIFETIME parameter is not valid
#endif
 
//C++ guard
#ifdef __cplusplus
extern "C" {
#endif
 
//DNS related functions
error_t dnsResolve(NetInterface *interface, const char_t *name,
   HostType type, IpAddr *ipAddr);
 
error_t dnsSendQuery(DnsCacheEntry *entry);
 
void dnsProcessResponse(NetInterface *interface,
   const IpPseudoHeader *pseudoHeader, const UdpHeader *udpHeader,
   const NetBuffer *buffer, size_t offset, const NetRxAncillary *ancillary,
   void *param);
 
void dnsSelectNextServer(DnsCacheEntry *entry);
 
//C++ guard
#ifdef __cplusplus
}
#endif
 
#endif