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cce4cfef10
Co-authored-by: xrplf-ai-reviewer[bot] <266832837+xrplf-ai-reviewer[bot]@users.noreply.github.com>
62 lines
1.8 KiB
C++
62 lines
1.8 KiB
C++
#include <xrpl/beast/net/IPAddressV6.h>
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#include <xrpl/beast/net/IPAddressV4.h>
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#include <boost/asio/ip/address_v6.hpp>
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namespace beast::IP {
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bool
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isPrivate(AddressV6 const& addr)
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{
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// fc00::/7 - Unique Local Address (ULA), covers fc00:: and fd00::
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if ((addr.to_bytes()[0] & 0xfe) == 0xfc)
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return true;
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if (addr.is_v4_mapped())
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return isPrivate(boost::asio::ip::make_address_v4(boost::asio::ip::v4_mapped, addr));
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return false;
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}
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bool
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isPublic(AddressV6 const& addr)
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{
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if (addr.is_loopback())
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return false;
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if (addr.is_v4_mapped())
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return isPublic(boost::asio::ip::make_address_v4(boost::asio::ip::v4_mapped, addr));
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if (isPrivate(addr))
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return false;
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if (addr.is_multicast())
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return false;
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if (addr.is_unspecified())
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return false;
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auto const b = addr.to_bytes();
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// fe80::/10 - Link-local
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if (b[0] == 0xfe && (b[1] & 0xc0) == 0x80)
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return false;
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// 100::/64 - Discard prefix (RFC 6666)
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if (b[0] == 0x01 && b[1] == 0x00 && b[2] == 0 && b[3] == 0 && b[4] == 0 && b[5] == 0 &&
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b[6] == 0 && b[7] == 0)
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return false;
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// 2001:db8::/32 - Documentation (RFC 3849)
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if (b[0] == 0x20 && b[1] == 0x01 && b[2] == 0x0d && b[3] == 0xb8)
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return false;
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// 2001::/32 - IETF Protocol Assignments / Teredo (RFC 4380)
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if (b[0] == 0x20 && b[1] == 0x01 && b[2] == 0x00 && b[3] == 0x00)
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return false;
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// 2001:20::/28 - ORCHIDv2 (RFC 7343)
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// 28-bit prefix: 0x2001002 => b[0]=0x20, b[1]=0x01, b[2]=0x00,
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// top nibble of b[3]=0x2
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if (b[0] == 0x20 && b[1] == 0x01 && b[2] == 0x00 && (b[3] & 0xf0) == 0x20)
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return false;
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// 2002::/16 - 6to4 (RFC 3056, deprecated by RFC 7526)
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if (b[0] == 0x20 && b[1] == 0x02)
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return false;
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return true;
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}
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} // namespace beast::IP
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