nat.h

贡献一份commoncpp2,有兴趣的可以研究一下

// Copyright (C) 2004 TintaDigital - STI, LDA.
//
// 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 2 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.
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// along with this program; if not, write to the Free Software
// Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
//
// As a special exception to the GNU General Public License, permission is
// granted for additional uses of the text contained in its release
// of Common C++.
//
// The exception is that, if you link the Common C++ library with other files
// to produce an executable, this does not by itself cause the
// resulting executable to be covered by the GNU General Public License.
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// Common C++, as the General Public License permits, the exception does
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/**
 * @file nat.h
 * @short Network Address Translation interface functions.
 * @author Ricardo Gameiro <rgameiro at tintadigital dot com>
 **/

#ifndef CCXX_NAT_H
#define CCXX_NAT_H

#ifdef	CCXX_NAMESPACES
namespace ost {
#endif

#ifndef	WIN32
typedef	int SOCKET;
#endif

enum natResult {
  natOK = 0,
  natSearchErr = 1,
  natNotSupported = 2,
  natDevUnavail = 3,
  natSocknameErr = 4,
  natPeernameErr = 5,
  natSockTypeErr = 6,
  natIFaceErr = 7,
  natUnkownErr = 8
};

typedef natResult natResult;

/**
 * Perform NAT address table lookup for the current socket.
 *
 * @param sfd socket to get nat info from.
 * @param nat sockaddr structure to hold results.
 */
natResult natv4Lookup( SOCKET sfd, struct sockaddr_in * nat );
#ifdef CCXX_IPV6
natResult natv6Lookup( SOCKET sfd, struct sockaddr_in6 * nat );
#endif

/**
 * Return descriptive text for the NAT Lookup return error.
 *
 * @param res result from NATLookup function.
 * @return error description.
 */
char * natErrorString( natResult res );

#ifdef	CCXX_NAMESPACES
}
#endif

#endif