mirror of
https://github.com/zerotier/ZeroTierOne.git
synced 2024-12-23 23:02:23 +00:00
251 lines
6.1 KiB
C++
251 lines
6.1 KiB
C++
/*
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* ZeroTier One - Global Peer to Peer Ethernet
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* Copyright (C) 2011-2015 ZeroTier Networks
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*
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* This program is free software: you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation, either version 3 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program. If not, see <http://www.gnu.org/licenses/>.
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*
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* --
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*
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* ZeroTier may be used and distributed under the terms of the GPLv3, which
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* are available at: http://www.gnu.org/licenses/gpl-3.0.html
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*
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* If you would like to embed ZeroTier into a commercial application or
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* redistribute it in a modified binary form, please contact ZeroTier Networks
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* LLC. Start here: http://www.zerotier.com/
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*/
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#ifndef ZT_ADDRESS_HPP
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#define ZT_ADDRESS_HPP
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#include <stdio.h>
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#include <stdlib.h>
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#include <stdint.h>
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#include <string.h>
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#include <string>
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#include "Constants.hpp"
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#include "Utils.hpp"
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#include "Buffer.hpp"
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namespace ZeroTier {
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/**
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* A ZeroTier address
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*/
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class Address
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{
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public:
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Address()
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throw() :
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_a(0)
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{
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}
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Address(const Address &a)
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throw() :
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_a(a._a)
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{
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}
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Address(uint64_t a)
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throw() :
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_a(a & 0xffffffffffULL)
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{
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}
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Address(const char *s)
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throw()
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{
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unsigned char foo[ZT_ADDRESS_LENGTH];
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setTo(foo,Utils::unhex(s,foo,ZT_ADDRESS_LENGTH));
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}
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Address(const std::string &s)
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throw()
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{
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unsigned char foo[ZT_ADDRESS_LENGTH];
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setTo(foo,Utils::unhex(s.c_str(),foo,ZT_ADDRESS_LENGTH));
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}
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/**
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* @param bits Raw address -- 5 bytes, big-endian byte order
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* @param len Length of array
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*/
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Address(const void *bits,unsigned int len)
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throw()
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{
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setTo(bits,len);
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}
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inline Address &operator=(const Address &a)
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throw()
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{
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_a = a._a;
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return *this;
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}
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inline Address &operator=(const uint64_t a)
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throw()
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{
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_a = (a & 0xffffffffffULL);
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return *this;
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}
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/**
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* @param bits Raw address -- 5 bytes, big-endian byte order
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* @param len Length of array
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*/
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inline void setTo(const void *bits,unsigned int len)
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throw()
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{
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if (len < ZT_ADDRESS_LENGTH) {
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_a = 0;
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return;
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}
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const unsigned char *b = (const unsigned char *)bits;
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uint64_t a = ((uint64_t)*b++) << 32;
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a |= ((uint64_t)*b++) << 24;
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a |= ((uint64_t)*b++) << 16;
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a |= ((uint64_t)*b++) << 8;
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a |= ((uint64_t)*b);
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_a = a;
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}
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/**
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* @param bits Buffer to hold 5-byte address in big-endian byte order
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* @param len Length of array
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*/
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inline void copyTo(void *bits,unsigned int len) const
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throw()
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{
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if (len < ZT_ADDRESS_LENGTH)
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return;
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unsigned char *b = (unsigned char *)bits;
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*(b++) = (unsigned char)((_a >> 32) & 0xff);
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*(b++) = (unsigned char)((_a >> 24) & 0xff);
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*(b++) = (unsigned char)((_a >> 16) & 0xff);
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*(b++) = (unsigned char)((_a >> 8) & 0xff);
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*b = (unsigned char)(_a & 0xff);
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}
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/**
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* Append to a buffer in big-endian byte order
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*
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* @param b Buffer to append to
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*/
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template<unsigned int C>
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inline void appendTo(Buffer<C> &b) const
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throw(std::out_of_range)
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{
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unsigned char *p = (unsigned char *)b.appendField(ZT_ADDRESS_LENGTH);
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*(p++) = (unsigned char)((_a >> 32) & 0xff);
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*(p++) = (unsigned char)((_a >> 24) & 0xff);
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*(p++) = (unsigned char)((_a >> 16) & 0xff);
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*(p++) = (unsigned char)((_a >> 8) & 0xff);
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*p = (unsigned char)(_a & 0xff);
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}
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/**
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* @return Integer containing address (0 to 2^40)
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*/
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inline uint64_t toInt() const
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throw()
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{
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return _a;
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}
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/**
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* Test whether this address is within a multicast propagation prefix
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*
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* Multicast propagation prefixes are (right-to-left a.k.a. LSB to MSB)
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* bit pattern prefixes of prefixBits bits that restrict which peers are
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* visited along a given multicast graph traversal path.
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*
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* @param prefix Prefix bit pattern (LSB to MSB)
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* @param prefixBits Number of bits in prefix bit pattern
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* @return True if address is within prefix
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*/
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inline bool withinMulticastPropagationPrefix(uint64_t prefix,unsigned int prefixBits) const
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throw()
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{
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return ((_a & (0xffffffffffffffffULL >> (64 - prefixBits))) == prefix);
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}
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/**
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* @return Hexadecimal string
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*/
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inline std::string toString() const
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{
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char buf[16];
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Utils::snprintf(buf,sizeof(buf),"%.10llx",(unsigned long long)_a);
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return std::string(buf);
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};
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/**
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* @param buf Buffer to fill
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* @param len Length of buffer
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*/
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inline void toString(char *buf,unsigned int len) const
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{
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Utils::snprintf(buf,len,"%.10llx",(unsigned long long)_a);
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}
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/**
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* @return True if this address is not zero
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*/
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inline operator bool() const throw() { return (_a != 0); }
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/**
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* Set to null/zero
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*/
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inline void zero() throw() { _a = 0; }
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/**
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* Check if this address is reserved
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*
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* The all-zero null address and any address beginning with 0xff are
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* reserved. (0xff is reserved for future use to designate possibly
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* longer addresses, addresses based on IPv6 innards, etc.)
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*
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* @return True if address is reserved and may not be used
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*/
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inline bool isReserved() const
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throw()
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{
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return ((!_a)||((_a >> 32) == ZT_ADDRESS_RESERVED_PREFIX));
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}
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/**
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* @param i Value from 0 to 4 (inclusive)
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* @return Byte at said position (address interpreted in big-endian order)
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*/
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inline unsigned char operator[](unsigned int i) const throw() { return (unsigned char)((_a >> (32 - (i * 8))) & 0xff); }
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inline bool operator==(const Address &a) const throw() { return (_a == a._a); }
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inline bool operator!=(const Address &a) const throw() { return (_a != a._a); }
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inline bool operator>(const Address &a) const throw() { return (_a > a._a); }
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inline bool operator<(const Address &a) const throw() { return (_a < a._a); }
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inline bool operator>=(const Address &a) const throw() { return (_a >= a._a); }
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inline bool operator<=(const Address &a) const throw() { return (_a <= a._a); }
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private:
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uint64_t _a;
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};
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} // namespace ZeroTier
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#endif
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