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/*
* Copyright 2012-2020 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.
*/
#ifndef IPV6_ADDRESS_HXX
#define IPV6_ADDRESS_HXX
#include "SocketAddress.hxx"
#include "util/ByteOrder.hxx"
#include <cstdint>
#ifdef _WIN32
#include <winsock2.h>
#include <ws2tcpip.h>
#else
#include <netinet/in.h>
#endif
class IPv4Address;
/**
* An OO wrapper for struct sockaddr_in.
*/
class IPv6Address {
struct sockaddr_in6 address;
static constexpr struct in6_addr Construct(uint16_t a, uint16_t b,
uint16_t c, uint16_t d,
uint16_t e, uint16_t f,
uint16_t g, uint16_t h) noexcept {
struct in6_addr result{};
result.s6_addr[0] = a >> 8;
result.s6_addr[1] = a;
result.s6_addr[2] = b >> 8;
result.s6_addr[3] = b;
result.s6_addr[4] = c >> 8;
result.s6_addr[5] = c;
result.s6_addr[6] = d >> 8;
result.s6_addr[7] = d;
result.s6_addr[8] = e >> 8;
result.s6_addr[9] = e;
result.s6_addr[10] = f >> 8;
result.s6_addr[11] = f;
result.s6_addr[12] = g >> 8;
result.s6_addr[13] = g;
result.s6_addr[14] = h >> 8;
result.s6_addr[15] = h;
return result;
}
static constexpr struct sockaddr_in6 Construct(struct in6_addr address,
uint16_t port,
uint32_t scope_id) noexcept {
struct sockaddr_in6 sin{};
sin.sin6_family = AF_INET6;
sin.sin6_port = ToBE16(port);
sin.sin6_addr = address;
sin.sin6_scope_id = scope_id;
return sin;
}
public:
IPv6Address() = default;
constexpr IPv6Address(struct in6_addr _address, uint16_t port,
uint32_t scope_id=0) noexcept
:address(Construct(_address, port, scope_id)) {}
constexpr explicit IPv6Address(uint16_t port,
uint32_t scope_id=0) noexcept
:IPv6Address(IN6ADDR_ANY_INIT, port, scope_id) {}
constexpr IPv6Address(uint16_t a, uint16_t b, uint16_t c, uint16_t d,
uint16_t e, uint16_t f, uint16_t g, uint16_t h,
uint16_t port, uint32_t scope_id=0) noexcept
:IPv6Address(Construct(a, b, c, d, e, f, g, h),
port, scope_id) {}
/**
* Construct with data copied from a #SocketAddress. Its
* address family must be AF_INET6.
*/
explicit IPv6Address(SocketAddress src) noexcept;
/**
* Generate a (net-)mask with the specified prefix length.
*/
static constexpr IPv6Address MaskFromPrefix(unsigned prefix_length) noexcept {
return IPv6Address(MaskWord(prefix_length, 0),
MaskWord(prefix_length, 16),
MaskWord(prefix_length, 32),
MaskWord(prefix_length, 48),
MaskWord(prefix_length, 64),
MaskWord(prefix_length, 80),
MaskWord(prefix_length, 96),
MaskWord(prefix_length, 112),
~uint16_t(0),
~uint32_t(0));
}
/**
* Cast a #sockaddr_in6 reference to an IPv6Address reference.
*/
static constexpr const IPv6Address &Cast(const struct sockaddr_in6 &src) noexcept {
/* this reinterpret_cast works because this class is
just a wrapper for struct sockaddr_in6 */
return *(const IPv6Address *)(const void *)&src;
}
/**
* Return a downcasted reference to the address. This call is
* only legal after verifying SocketAddress::GetFamily().
*/
static constexpr const IPv6Address &Cast(const SocketAddress src) noexcept {
return Cast(src.CastTo<struct sockaddr_in6>());
}
constexpr operator SocketAddress() const noexcept {
return SocketAddress((const struct sockaddr *)(const void *)&address,
sizeof(address));
}
constexpr SocketAddress::size_type GetSize() const noexcept {
return sizeof(address);
}
constexpr bool IsDefined() const noexcept {
return address.sin6_family != AF_UNSPEC;
}
constexpr bool IsValid() const noexcept {
return address.sin6_family == AF_INET6;
}
constexpr uint16_t GetPort() const noexcept {
return FromBE16(address.sin6_port);
}
void SetPort(uint16_t port) noexcept {
address.sin6_port = ToBE16(port);
}
constexpr const struct in6_addr &GetAddress() const noexcept {
return address.sin6_addr;
}
constexpr uint32_t GetScopeId() const noexcept {
return address.sin6_scope_id;
}
/**
* Is this the IPv6 wildcard address (in6addr_any)?
*/
[[gnu::pure]]
bool IsAny() const noexcept;
/**
* Is this an IPv4 address mapped inside struct sockaddr_in6?
*/
#if defined(__linux__)
constexpr
#endif
bool IsV4Mapped() const noexcept {
return IN6_IS_ADDR_V4MAPPED(&address.sin6_addr);
}
/**
* Convert "::ffff:127.0.0.1" to "127.0.0.1".
*/
[[gnu::pure]]
IPv4Address UnmapV4() const noexcept;
/**
* Bit-wise AND of two addresses. This is useful for netmask
* calculations.
*/
[[gnu::pure]]
IPv6Address operator&(const IPv6Address &other) const;
private:
/**
* Helper function for MaskFromPrefix().
*/
static constexpr uint16_t MaskWord(unsigned prefix_length,
unsigned offset) noexcept {
return prefix_length <= offset
? 0
: (prefix_length >= offset + 16
? 0xffff
: (0xffff << (offset + 16 - prefix_length)));
}
};
#endif
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