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/*
* Copyright 2012-2019 Max Kellermann <max.kellermann@gmail.com>
*
* 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.
*
* 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
* FOUNDATION OR CONTRIBUTORS 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.
*/
#include "IPv6Address.hxx"
#include "IPv4Address.hxx"
#include <cassert>
#include <string.h>
static const struct sockaddr_in6 *
CastToIPv6(const struct sockaddr *p) noexcept
{
assert(p->sa_family == AF_INET6);
/* cast through void to work around the bogus alignment warning */
const void *q = reinterpret_cast<const void *>(p);
return reinterpret_cast<const struct sockaddr_in6 *>(q);
}
IPv6Address::IPv6Address(SocketAddress src) noexcept
:address(*CastToIPv6(src.GetAddress())) {}
bool
IPv6Address::IsAny() const noexcept
{
assert(IsValid());
return memcmp(&address.sin6_addr,
&in6addr_any, sizeof(in6addr_any)) == 0;
}
IPv4Address
IPv6Address::UnmapV4() const noexcept
{
assert(IsV4Mapped());
struct sockaddr_in buffer{};
buffer.sin_family = AF_INET;
memcpy(&buffer.sin_addr, ((const char *)&address.sin6_addr) + 12,
sizeof(buffer.sin_addr));
buffer.sin_port = address.sin6_port;
return buffer;
}
template<typename T>
static void
BitwiseAndT(T *dest, const T *a, const T *b, size_t n)
{
while (n-- > 0)
*dest++ = *a++ & *b++;
}
static void
BitwiseAnd32(void *dest, const void *a, const void *b, size_t n)
{
using value_type = uint32_t;
using pointer = value_type *;
using const_pointer = const value_type *;
BitwiseAndT(pointer(dest), const_pointer(a), const_pointer(b),
n / sizeof(value_type));
}
IPv6Address
IPv6Address::operator&(const IPv6Address &other) const
{
IPv6Address result;
BitwiseAnd32(&result, this, &other,
sizeof(result));
return result;
}
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