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/*
* Copyright 2012-2021 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 STATIC_SOCKET_ADDRESS_HXX
#define STATIC_SOCKET_ADDRESS_HXX
#include "SocketAddress.hxx" // IWYU pragma: export
#include "Features.hxx"
#include <cassert>
struct StringView;
/**
* An OO wrapper for struct sockaddr_storage.
*/
class StaticSocketAddress {
friend class SocketDescriptor;
public:
typedef SocketAddress::size_type size_type;
private:
size_type size;
struct sockaddr_storage address;
public:
StaticSocketAddress() = default;
StaticSocketAddress &operator=(SocketAddress other) noexcept;
constexpr operator SocketAddress() const noexcept {
return SocketAddress(*this, size);
}
constexpr operator struct sockaddr *() noexcept {
return (struct sockaddr *)(void *)&address;
}
constexpr operator const struct sockaddr *() const noexcept {
return (const struct sockaddr *)(const void *)&address;
}
/**
* Cast the "sockaddr" pointer to a different address type,
* e.g. "sockaddr_in". This is only legal after checking
* GetFamily().
*/
template<typename T>
constexpr const T &CastTo() const noexcept {
/* cast through void to work around the bogus
alignment warning */
const void *q = reinterpret_cast<const void *>(&address);
return *reinterpret_cast<const T *>(q);
}
constexpr size_type GetCapacity() const noexcept {
return sizeof(address);
}
size_type GetSize() const noexcept {
return size;
}
void SetSize(size_type _size) noexcept {
assert(_size > 0);
assert(size_t(_size) <= sizeof(address));
size = _size;
}
/**
* Set the size to the maximum value for this class.
*/
void SetMaxSize() {
SetSize(GetCapacity());
}
int GetFamily() const noexcept {
return address.ss_family;
}
bool IsDefined() const noexcept {
return GetFamily() != AF_UNSPEC;
}
void Clear() noexcept {
size = sizeof(address.ss_family);
address.ss_family = AF_UNSPEC;
}
#ifdef HAVE_UN
/**
* @see SocketAddress::GetLocalRaw()
*/
[[gnu::pure]]
StringView GetLocalRaw() const noexcept;
#endif
#ifdef HAVE_TCP
/**
* Extract the port number. Returns 0 if not applicable.
*/
[[gnu::pure]]
unsigned GetPort() const noexcept {
return ((SocketAddress)*this).GetPort();
}
/**
* @return true on success, false if this address cannot have
* a port number
*/
bool SetPort(unsigned port) noexcept;
#endif
[[gnu::pure]]
bool operator==(SocketAddress other) const noexcept {
return (SocketAddress)*this == other;
}
bool operator!=(SocketAddress other) const noexcept {
return !(*this == other);
}
};
#endif
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