topical media & game development

topical media & game development

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lib-of-vs-libs-Poco-include-Poco-Net-DNS.h / h


  //
  // DNS.h
  //
  //  $Id: //poco/1.3/Net/include/Poco/Net/DNS.h#1$ 
  //
  // Library: Net
  // Package: NetCore
  // Module:  DNS
  //
  // Definition of the DNS class.
  //
  // Copyright (c) 2005-2006, Applied Informatics Software Engineering GmbH.
  // and Contributors.
  //
  // Permission is hereby granted, free of charge, to any person or organization
  // obtaining a copy of the software and accompanying documentation covered by
  // this license (the "Software") to use, reproduce, display, distribute,
  // execute, and transmit the Software, and to prepare derivative works of the
  // Software, and to permit third-parties to whom the Software is furnished to
  // do so, all subject to the following:
  // 
  // The copyright notices in the Software and this entire statement, including
  // the above license grant, this restriction and the following disclaimer,
  // must be included in all copies of the Software, in whole or in part, and
  // all derivative works of the Software, unless such copies or derivative
  // works are solely in the form of machine-executable object code generated by
  // a source language processor.
  // 
  // 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, TITLE AND NON-INFRINGEMENT. IN NO EVENT
  // SHALL THE COPYRIGHT HOLDERS OR ANYONE DISTRIBUTING THE SOFTWARE BE LIABLE
  // FOR ANY DAMAGES OR OTHER LIABILITY, WHETHER IN CONTRACT, TORT OR OTHERWISE,
  // ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
  // DEALINGS IN THE SOFTWARE.
  //
  
  ifndef Net_DNS_INCLUDED
  define Net_DNS_INCLUDED
  
  include "Poco/Net/Net.h"
  include "Poco/Net/SocketDefs.h"
  include "Poco/Net/IPAddress.h"
  include "Poco/Net/HostEntry.h"
  include "Poco/Mutex.h"
  include <map>
  
  namespace Poco {
  namespace Net {
  
  class Net_API DNS

This class provides an interface to the domain name service. An internal DNS cache is used to speed up name lookups. { public: static const HostEntry& hostByName(const std::string& hostname); Returns a HostEntry object containing the DNS information for the host with the given name. Throws a HostNotFoundException if a host with the given name cannot be found. Throws a NoAddressFoundException if no address can be found for the hostname. Throws a DNSException in case of a general DNS error. Throws an IOException in case of any other error. static const HostEntry& hostByAddress(const IPAddress& address); Returns a HostEntry object containing the DNS information for the host with the given IP address. Throws a HostNotFoundException if a host with the given name cannot be found. Throws a DNSException in case of a general DNS error. Throws an IOException in case of any other error.


          static const HostEntry& resolve(const std::string& address);

Returns a HostEntry object containing the DNS information for the host with the given IP address or host name. Throws a HostNotFoundException if a host with the given name cannot be found. Throws a NoAddressFoundException if no address can be found for the hostname. Throws a DNSException in case of a general DNS error. Throws an IOException in case of any other error. static IPAddress resolveOne(const std::string& address); Convenience method that calls resolve(address) and returns the first address from the HostInfo.


          static const HostEntry& thisHost();

Returns a HostEntry object containing the DNS information for this host. Throws a HostNotFoundException if DNS information for this host cannot be found. Throws a NoAddressFoundException if no address can be found for this host. Throws a DNSException in case of a general DNS error. Throws an IOException in case of any other error.


          static void flushCache();

Flushes the internal DNS cache.


  protected:
          static int lastError();

Returns the code of the last error. static void error(int code, const std::string& arg); Throws an exception according to the error code. private: typedef std::map<std::string, HostEntry> DNSCache; static DNSCache _cache; static Poco::FastMutex _mutex; };


  } } // namespace Poco::Net
  
  endif // Net_DNS_INCLUDED

[] readme course(s) preface I 1 2 II 3 4 III 5 6 7 IV 8 9 10 V 11 12 afterthought(s) appendix reference(s) example(s) resource(s) _

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