monero/contrib/epee/include/net/local_ip.h

// Copyright (c) 2006-2013, Andrey N. Sabelnikov, www.sabelnikov.net
// All rights reserved.
// 
// Redistribution and use in source and binary forms, with or without
// modification, are permitted provided that the following conditions are met:
// * Redistributions of source code must retain the above copyright
// notice, this list of conditions and the following disclaimer.
// * Redistributions in binary form must reproduce the above copyright
// notice, this list of conditions and the following disclaimer in the
// documentation and/or other materials provided with the distribution.
// * Neither the name of the Andrey N. Sabelnikov nor the
// names of its contributors may be used to endorse or promote products
// derived from this software without specific prior written permission.
// 
// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND
// ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
// WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
// DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER  BE LIABLE FOR ANY
// DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
// (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
// LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
// ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
// (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
// SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
// 


#pragma once

#include <string>
#include <boost/algorithm/string/predicate.hpp>
#include <boost/asio/ip/address_v6.hpp>
#include "int-util.h"

// IP addresses are kept in network byte order
// Masks below are little endian
// -> convert from network byte order to host byte order before comparing

namespace epee
{
  namespace net_utils
  {

    inline
    bool is_ipv6_local(const std::string& ip)
    {
      auto addr = boost::asio::ip::address_v6::from_string(ip);

      // ipv6 link-local unicast addresses are fe80::/10
      bool is_link_local = addr.is_link_local();

      auto addr_bytes = addr.to_bytes();

      // ipv6 unique local unicast addresses start with fc00::/7 -- (fcXX or fdXX)
      bool is_unique_local_unicast = (addr_bytes[0] == 0xfc || addr_bytes[0] == 0xfd);

      return is_link_local || is_unique_local_unicast;
    }

    inline
    bool is_ipv6_loopback(const std::string& ip)
    {
      // ipv6 loopback is ::1
      return boost::asio::ip::address_v6::from_string(ip).is_loopback();
    }

    inline
    bool is_ip_local(uint32_t ip)
    {
      ip = SWAP32LE(ip);
      /*
      local ip area
      10.0.0.0 <EFBFBD> 10.255.255.255 
      172.16.0.0 <EFBFBD> 172.31.255.255 
      192.168.0.0 <EFBFBD> 192.168.255.255 
      */
      if( (ip | 0xffffff00) == 0xffffff0a)
        return true;

      if( (ip | 0xffff0000) == 0xffffa8c0)
        return true;

      if( (ip | 0xffffff00) == 0xffffffac)
      {
        uint32_t second_num = (ip >> 8) & 0xff;
        if(second_num >= 16 && second_num <= 31 )
          return true;
      }
      return false;
    }
    inline
    bool is_ip_loopback(uint32_t ip)
    {
      ip = SWAP32LE(ip);
      if( (ip | 0xffffff00) == 0xffffff7f)
        return true;
      //MAKE_IP
      /*
      loopback ip
      127.0.0.0 <EFBFBD> 127.255.255.255 
      */
      return false;
    }
   
  }
}