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// Copyright (C) 2016 THL A29 Limited, a Tencent company. All rights reserved.

// Licensed under the MIT License (the "License"); you may not use this file except in 
// compliance with the License. You may obtain a copy of the License at
// http://opensource.org/licenses/MIT

// Unless required by applicable law or agreed to in writing, software distributed under the License is
// distributed on an "AS IS" basis, WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND,
// either express or implied. See the License for the specific language governing permissions and
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/*
 * nat64_prefix_util.h
 *
 *  Created on: 2016年6月22日
 *      Author: wutianqiang
 */

#ifndef SOCKET_NAT64_PREFIX_UTIL_H_
#define SOCKET_NAT64_PREFIX_UTIL_H_

/*
 * WARNING:All functions below may be blocked when called first time, please don't use these functions in main thread.
 * if current network is not ipv6-only, these fuction all will return false
 * */
#include <string>

#ifdef __APPLE__
    #ifndef s6_addr16
        #define	s6_addr16   __u6_addr.__u6_addr16
    #endif

    #ifndef s6_addr32
        #define	s6_addr32   __u6_addr.__u6_addr32
    #endif
#endif
/*
 * param: _nat64_prefix, return the nat64 prefix, using a string
 * return: if return false, then _nat64_prfix is empty string.
 * */
bool  GetNetworkNat64Prefix(std::string& _nat64_prefix);

/*
 * param: _nat64_prefix_in6, return the nat64 prefix, using struct in6_addr.
 * 		  _nat64_prefix_in6.s6_addr32[0~2](12 Bytes) contain the nat64 prefix
 * return: if return false, _nat64_prefix_in6 will not change.
 * */
bool  GetNetworkNat64Prefix(struct in6_addr& _nat64_prefix_in6);


/*
 * param: _v4_ip:the input v4 ip, _nat64_v6_ip the output v6 ip, which embeded _v4_ip with format RFC6052
 * return: if return false(MAY BE INVALID _v4_ip), _nat64_v6_ip will not change.
 * */
bool ConvertV4toNat64V6(const std::string& _v4_ip, std::string& _nat64_v6_ip) ;

/*
 * param: _v4_addr input v4 addr, _v6_addr the output v6 addr, which embeded _v4_addr with format RFC6052
 * return: if return false, _v6_addr will not change.
 * */
bool ConvertV4toNat64V6(const struct in_addr& _v4_addr, struct in6_addr& _v6_addr);
#endif /* SOCKET_NAT64_PREFIX_UTIL_H_ */