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#ifndef TMWA_COMMON_IP_HPP
#define TMWA_COMMON_IP_HPP
// ip.hpp - classes to deal with IP addresses.
//
// Copyright © 2013 Ben Longbons <b.r.longbons@gmail.com>
//
// This file is part of The Mana World (Athena server)
//
// This program is free software: you can redistribute it and/or modify
// it under the terms of the GNU General Public License as published by
// the Free Software Foundation, either version 3 of the License, or
// (at your option) any later version.
//
// This program is distributed in the hope that it will be useful,
// but WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
// GNU General Public License for more details.
//
// You should have received a copy of the GNU General Public License
// along with this program. If not, see <http://www.gnu.org/licenses/>.
#include "sanity.hpp"
#include <netinet/in.h>
#include "extract.hpp"
#include "strings.hpp"
// TODO - in the long run ports belong here also
// and of course, IPv6 stuff.
// But what about unix socket addresses?
/// Helper function
template<class T, size_t n>
constexpr
bool _ce_a_lt(T (&a)[n], T (&b)[n], size_t i=0)
{
return (i != n
&& (a[i] < b[i]
|| (a[i] == b[i]
&& _ce_a_lt(a, b, i + 1))));
}
/// A 32-bit Ipv4 address. Does not include a port.
/// Guaranteed to be laid out like the network wants.
class IP4Address
{
uint8_t _addr[4];
public:
constexpr
IP4Address()
: _addr{}
{}
constexpr explicit
IP4Address(const uint8_t (&a)[4])
: _addr{a[0], a[1], a[2], a[3]}
{}
explicit
IP4Address(struct in_addr addr)
{
static_assert(sizeof(addr) == sizeof(_addr), "4 bytes");
*this = IP4Address(reinterpret_cast<const uint8_t (&)[4]>(addr));
}
explicit
operator struct in_addr() const
{
return reinterpret_cast<const struct in_addr&>(_addr);
}
constexpr friend
IP4Address operator & (IP4Address l, IP4Address r)
{
return IP4Address({
static_cast<uint8_t>(l._addr[0] & r._addr[0]),
static_cast<uint8_t>(l._addr[1] & r._addr[1]),
static_cast<uint8_t>(l._addr[2] & r._addr[2]),
static_cast<uint8_t>(l._addr[3] & r._addr[3]),
});
}
IP4Address& operator &= (IP4Address m)
{ return *this = *this & m; }
const uint8_t *bytes() const
{ return _addr; }
constexpr friend
bool operator < (IP4Address l, IP4Address r)
{
return _ce_a_lt(l._addr, r._addr);
}
constexpr friend
bool operator > (IP4Address l, IP4Address r)
{
return _ce_a_lt(r._addr, l._addr);
}
constexpr friend
bool operator >= (IP4Address l, IP4Address r)
{
return !_ce_a_lt(l._addr, r._addr);
}
constexpr friend
bool operator <= (IP4Address l, IP4Address r)
{
return !_ce_a_lt(r._addr, l._addr);
}
constexpr friend
bool operator == (IP4Address l, IP4Address r)
{
return !(l < r || r < l);
}
constexpr friend
bool operator != (IP4Address l, IP4Address r)
{
return (l < r || r < l);
}
};
class IP4Mask
{
IP4Address _addr, _mask;
public:
constexpr
IP4Mask() : _addr(), _mask()
{}
constexpr
IP4Mask(IP4Address a, IP4Address m) : _addr(a & m), _mask(m)
{}
constexpr
IP4Address addr() const
{ return _addr; }
constexpr
IP4Address mask() const
{ return _mask; }
constexpr
bool covers(IP4Address a) const
{
return (a & _mask) == _addr;
}
};
constexpr
IP4Address IP4_LOCALHOST({127, 0, 0, 1});
constexpr
IP4Address IP4_BROADCAST({255, 255, 255, 255});
VString<15> convert_for_printf(IP4Address a);
VString<31> convert_for_printf(IP4Mask m);
bool extract(XString str, IP4Address *iv);
bool extract(XString str, IP4Mask *iv);
#endif // TMWA_COMMON_IP_HPP
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