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IPAddress.h

//
// IPAddress.h
//
// $Id: //poco/1.2/Net/include/Poco/Net/IPAddress.h#1 $
//
// Library: Net
// Package: NetCore
// Module:  IPAddress
//
// Definition of the IPAddress 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_IPAddress_INCLUDED
#define Net_IPAddress_INCLUDED


#include "Poco/Net/Net.h"
#include "Poco/Net/SocketDefs.h"


namespace Poco {
namespace Net {


class IPAddressImpl;


00054 class Net_API IPAddress
      /// This class represents an internet (IP) host
      /// address. The address can belong either to the
      /// IPv4 or the IPv6 address family.
      ///
      /// Relational operators (==, !=, <, <=, >, >=) are
      /// supported. However, you must not interpret any
      /// special meaning into the result of these 
      /// operations, other than that the results are
      /// consistent.
      ///
      /// Especially, an IPv4 address is never equal to
      /// an IPv6 address, even if the IPv6 address is
      /// IPv4 compatible and the addresses are the same.
      ///
      /// IPv6 addresses are supported only if the target platform
      /// supports IPv6.
{
public:
00073       enum Family
            /// Possible address families for IP addresses.
      {
            IPv4,
            IPv6
      };
      
      IPAddress();
            /// Creates a wildcard (zero) IPv4 IPAddress.

      IPAddress(const IPAddress& addr);
            /// Creates an IPAddress by copying another one.

      explicit IPAddress(Family family);
            /// Creates a wildcard (zero) IPAddress for the
            /// given address family.

      explicit IPAddress(const std::string& addr);
            /// Creates an IPAddress from the string containing
            /// an IP address in presentation format (dotted decimal
            /// for IPv4, hex string for IPv6).
            /// 
            /// Depending on the format of addr, either an IPv4 or
            /// an IPv6 address is created.
            ///
            /// See toString() for details on the supported formats.
            ///
            /// Throws an InvalidAddressException if the address cannot be parsed.

      IPAddress(const std::string& addr, Family family);
            /// Creates an IPAddress from the string containing
            /// an IP address in presentation format (dotted decimal
            /// for IPv4, hex string for IPv6).

      IPAddress(const void* addr, poco_socklen_t length);
            /// Creates an IPAddress from a native internet address.
            /// A pointer to a in_addr or a in6_addr structure may be 
            /// passed.

      ~IPAddress();
            /// Destroys the IPAddress.

      IPAddress& operator = (const IPAddress& addr);
            /// Assigns an IPAddress.
            
      void swap(IPAddress& address);
            /// Swaps the IPAddress with another one.
            
      Family family() const;
            /// Returns the address family (IPv4 or IPv6) of the address.
            
      std::string toString() const;
            /// Returns a string containing a representation of the address
            /// in presentation format.
            ///
            /// For IPv4 addresses the result will be in dotted-decimal
            /// (d.d.d.d) notation.
            ///
            /// Textual representation of IPv6 address is one of the following forms:
            ///
            /// The preferred form is x:x:x:x:x:x:x:x, where the 'x's are the hexadecimal 
            /// values of the eight 16-bit pieces of the address. This is the full form.
            /// Example: 1080:0:0:0:8:600:200A:425C
            ///
            /// It is not necessary to write the leading zeros in an individual field. 
            /// However, there must be at least one numeral in every field, except as described below.
            /// 
            /// It is common for IPv6 addresses to contain long strings of zero bits. 
            /// In order to make writing addresses containing zero bits easier, a special syntax is 
            /// available to compress the zeros. The use of "::" indicates multiple groups of 16-bits of zeros. 
            /// The "::" can only appear once in an address. The "::" can also be used to compress the leading 
            /// and/or trailing zeros in an address. Example: 1080::8:600:200A:425C
            ///
            /// For dealing with IPv4 compatible addresses in a mixed environment,
            /// a special syntax is available: x:x:x:x:x:x:d.d.d.d, where the 'x's are the 
            /// hexadecimal values of the six high-order 16-bit pieces of the address, 
        /// and the 'd's are the decimal values of the four low-order 8-bit pieces of the 
        /// standard IPv4 representation address. Example: ::FFFF:192.168.1.120
      
      bool isWildcard() const;
            /// Returns true iff the address is a wildcard (all zero)
            /// address.
            
      bool isBroadcast() const;
            /// Returns true iff the address is a broadcast address.
            ///
            /// Only IPv4 addresses can be broadcast addresses. In a broadcast
            /// address, all bits are one.
            ///
            /// For a IPv6 address, returns always false.
      
      bool isLoopback() const;
            /// Returns true iff the address is a loopback address.
            ///
            /// For IPv4, the loopback address is 127.0.0.1.
            ///
            /// For IPv6, the loopback address is ::1.
      
      bool isMulticast() const;
            /// Returns true iff the address is a multicast address.
            ///
            /// IPv4 multicast addresses are in the
            /// 224.0.0.0 to 239.255.255.255 range
            /// (the first four bits have the value 1110).
            ///
            /// IPv6 multicast addresses are in the
            /// FFxx:x:x:x:x:x:x:x range.
            
      bool isUnicast() const;
            /// Returns true iff the address is a unicast address.
            ///
            /// An address is unicast if it is neither a wildcard,
            /// broadcast or multicast address.
            
      bool isLinkLocal() const;
            /// Returns true iff the address is a link local unicast address.
            ///
            /// IPv4 link local addresses are in the 169.254.0.0/16 range,
            /// according to RFC 3927.
            ///
            /// IPv6 link local addresses have 1111 1110 10 as the first
            /// 10 bits, followed by 54 zeros.
            
      bool isSiteLocal() const;
            /// Returns true iff the address is a site local unicast address.
            ///
            /// IPv4 site local addresses are in on of the 10.0.0.0/24,
            /// 192.168.0.0/16 or 172.16.0.0 to 172.31.255.255 ranges.
            ///
            /// IPv6 site local addresses have 1111 1110 11 as the first
            /// 10 bits, followed by 38 zeros.
            
      bool isIPv4Compatible() const;
            /// Returns true iff the address is IPv4 compatible.
            ///
            /// For IPv4 addresses, this is always true.
            ///
            /// For IPv6, the address must be in the ::x:x range (the
            /// first 96 bits are zero).

      bool isIPv4Mapped() const;
            /// Returns true iff the address is an IPv4 mapped IPv6 address.
            ///
            /// For IPv4 addresses, this is always true.
            ///
            /// For IPv6, the address must be in the ::FFFF:x:x range.
      
      bool isWellKnownMC() const;
            /// Returns true iff the address is a well-known multicast address.
            ///
            /// For IPv4, well-known multicast addresses are in the 
            /// 224.0.0.0/8 range.
            ///
            /// For IPv6, well-known multicast addresses are in the 
            /// FF0x:x:x:x:x:x:x:x range.
      
      bool isNodeLocalMC() const;
            /// Returns true iff the address is a node-local multicast address.
            ///
            /// IPv4 does not support node-local addresses, thus the result is
            /// always false for an IPv4 address.
            ///
            /// For IPv6, node-local multicast addresses are in the
            /// FFx1:x:x:x:x:x:x:x range.
      
      bool isLinkLocalMC() const;
            /// Returns true iff the address is a link-local multicast address.
            ///
            /// For IPv4, link-local multicast addresses are in the
            /// 224.0.0.0/24 range. Note that this overlaps with the range for well-known
            /// multicast addresses.
            ///
            /// For IPv6, link-local multicast addresses are in the
            /// FFx2:x:x:x:x:x:x:x range.

      bool isSiteLocalMC() const;
            /// Returns true iff the address is a site-local multicast address.
            ///
            /// For IPv4, site local multicast addresses are in the
            /// 239.255.0.0/16 range.
            ///
            /// For IPv6, site-local multicast addresses are in the
            /// FFx5:x:x:x:x:x:x:x range.

      bool isOrgLocalMC() const;
            /// Returns true iff the address is a organization-local multicast address.
            ///
            /// For IPv4, organization-local multicast addresses are in the
            /// 239.192.0.0/16 range.
            ///
            /// For IPv6, organization-local multicast addresses are in the
            /// FFx8:x:x:x:x:x:x:x range.

      bool isGlobalMC() const;
            /// Returns true iff the address is a global multicast address.
            ///
            /// For IPv4, global multicast addresses are in the 
            /// 224.0.1.0 to 238.255.255.255 range.
            ///
            /// For IPv6, global multicast addresses are in the
            /// FFxF:x:x:x:x:x:x:x range.
      
      bool operator == (const IPAddress& addr) const; 
      bool operator != (const IPAddress& addr) const;
      bool operator <  (const IPAddress& addr) const;
      bool operator <= (const IPAddress& addr) const;
      bool operator >  (const IPAddress& addr) const;
      bool operator >= (const IPAddress& addr) const;
            
      poco_socklen_t length() const;
            /// Returns the length in bytes of the internal socket address structure.     
            
      const void* addr() const;
            /// Returns the internal address structure.
            
      int af() const;
            /// Returns the address family (AF_INET or AF_INET6) of the address.
            
      static IPAddress parse(const std::string& addr);
            /// Creates an IPAddress from the string containing
            /// an IP address in presentation format (dotted decimal
            /// for IPv4, hex string for IPv6).
            /// 
            /// Depending on the format of addr, either an IPv4 or
            /// an IPv6 address is created.
            ///
            /// See toString() for details on the supported formats.
            ///
            /// Throws an InvalidAddressException if the address cannot be parsed.

      static bool tryParse(const std::string& addr, IPAddress& result);
            /// Tries to interpret the given address string as an
            /// IP address in presentation format (dotted decimal
            /// for IPv4, hex string for IPv6).
            ///
            /// Returns true and stores the IPAddress in result if the
            /// string contains a valid address.
            ///
            /// Returns false and leaves result unchanged otherwise.

      enum
      {
            MAX_ADDRESS_LENGTH = 
#if defined(POCO_HAVE_IPv6)
                  sizeof(struct in6_addr)
#else
                  sizeof(struct in_addr)
#endif
                  /// Maximum length in bytes of a socket address.
      };

protected:
      void init(IPAddressImpl* pImpl);

private:
      IPAddressImpl* _pImpl;
};


//
// inlines
//
inline void swap(IPAddress& a1, IPAddress& a2)
{
      a1.swap(a2);
}


} } // namespace Poco::Net


#endif // Net_IPAddress_INCLUDED

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