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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.
*/
#ifndef IPV4_ADDRESS_HXX
#define IPV4_ADDRESS_HXX
#include "SocketAddress.hxx"
#include "system/ByteOrder.hxx"
#include <stdint.h>
#ifdef _WIN32
#include <winsock2.h>
#include <ws2tcpip.h>
#else
#include <netinet/in.h>
#endif
/**
* An OO wrapper for struct sockaddr_in.
*/
class IPv4Address {
struct sockaddr_in address;
#ifdef _WIN32
static constexpr struct in_addr ConstructInAddr(uint8_t a, uint8_t b,
uint8_t c, uint8_t d) noexcept {
struct in_addr result{};
result.s_net = a;
result.s_host = b;
result.s_lh = c;
result.s_impno = d;
return result;
}
#else
#ifdef __BIONIC__
typedef uint32_t in_addr_t;
#endif
static constexpr in_addr_t ConstructInAddrT(uint8_t a, uint8_t b,
uint8_t c, uint8_t d) noexcept {
return ToBE32((a << 24) | (b << 16) | (c << 8) | d);
}
static constexpr struct in_addr ConstructInAddr(uint8_t a, uint8_t b,
uint8_t c, uint8_t d) noexcept {
return ConstructInAddrBE(ConstructInAddrT(a, b, c, d));
}
#endif
/**
* @param x the 32 bit IP address in network byte order
*/
static constexpr struct in_addr ConstructInAddrBE(uint32_t x) noexcept {
struct in_addr ia{};
ia.s_addr = x;
return ia;
}
/**
* @param x the 32 bit IP address in host byte order
*/
static constexpr struct in_addr ConstructInAddr(uint32_t x) noexcept {
return ConstructInAddrBE(ToBE32(x));
}
/**
* @param port the port number in host byte order
*/
static constexpr struct sockaddr_in Construct(struct in_addr address,
uint16_t port) noexcept {
struct sockaddr_in sin{};
sin.sin_family = AF_INET;
sin.sin_port = ToBE16(port);
sin.sin_addr = address;
return sin;
}
/**
* @param x the 32 bit IP address in host byte order
* @param port the port number in host byte order
*/
static constexpr struct sockaddr_in Construct(uint32_t address,
uint16_t port) noexcept {
return Construct(ConstructInAddr(address), port);
}
public:
IPv4Address() = default;
constexpr IPv4Address(const struct sockaddr_in &_address) noexcept
:address(_address) {}
/**
* @param port the port number in host byte order
*/
constexpr IPv4Address(struct in_addr _address, uint16_t port) noexcept
:IPv4Address(Construct(_address, port)) {}
/**
* @param port the port number in host byte order
*/
constexpr IPv4Address(uint8_t a, uint8_t b, uint8_t c,
uint8_t d, uint16_t port) noexcept
:IPv4Address(ConstructInAddr(a, b, c, d), port) {}
/**
* @param port the port number in host byte order
*/
constexpr explicit IPv4Address(uint16_t port) noexcept
:IPv4Address(ConstructInAddr(INADDR_ANY), port) {}
/**
* Construct with data copied from a #SocketAddress. Its
* address family must be AF_INET.
*/
explicit IPv4Address(SocketAddress src) noexcept;
static constexpr struct in_addr Loopback() noexcept {
return ConstructInAddr(INADDR_LOOPBACK);
}
/**
* Generate a (net-)mask with the specified prefix length.
*/
static constexpr IPv4Address MaskFromPrefix(unsigned prefix_length) noexcept {
return Construct(prefix_length == 0
? 0
: (~uint32_t(0)) << (32 - prefix_length),
~uint16_t(0));
}
/**
* Return a downcasted reference to the address. This call is
* only legal after verifying SocketAddress::GetFamily().
*/
static constexpr const IPv4Address &Cast(const SocketAddress &src) noexcept {
/* this reinterpret_cast works because this class is
just a wrapper for struct sockaddr_in */
return *(const IPv4Address *)(const void *)src.GetAddress();
}
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.sin_family != AF_UNSPEC;
}
/**
* @return the port number in host byte order
*/
constexpr uint16_t GetPort() const noexcept {
return FromBE16(address.sin_port);
}
/**
* @param port the port number in host byte order
*/
void SetPort(uint16_t port) noexcept {
address.sin_port = ToBE16(port);
}
constexpr const struct in_addr &GetAddress() const noexcept {
return address.sin_addr;
}
/**
* @return the 32 bit IP address in network byte order
*/
constexpr uint32_t GetNumericAddressBE() const noexcept {
return GetAddress().s_addr;
}
/**
* @return the 32 bit IP address in host byte order
*/
constexpr uint32_t GetNumericAddress() const noexcept {
return FromBE32(GetNumericAddressBE());
}
/**
* Bit-wise AND of two addresses. This is useful for netmask
* calculations.
*/
constexpr IPv4Address operator&(const IPv4Address &other) const noexcept {
return IPv4Address(ConstructInAddrBE(GetNumericAddressBE() & other.GetNumericAddressBE()),
GetPort() & other.GetPort());
}
};
#endif
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