// public
bool IPAddress::inSubnetWithMask(const IPAddress& subnet, ByteRange mask)
const {
auto mkByteArray4 = [&]() -> ByteArray4 {
ByteArray4 ba{{0}};
std::memcpy(ba.data(), mask.begin(), std::min<size_t>(mask.size(), 4));
return ba;
};
if (bitCount() == subnet.bitCount()) {
if (isV4()) {
return asV4().inSubnetWithMask(subnet.asV4(), mkByteArray4());
} else {
ByteArray16 ba{{0}};
std::memcpy(ba.data(), mask.begin(), std::min<size_t>(mask.size(), 16));
return asV6().inSubnetWithMask(subnet.asV6(), ba);
}
}
// an IPv4 address can never belong in a IPv6 subnet unless the IPv6 is a 6to4
// address and vice-versa
if (isV6()) {
const IPAddressV6& v6addr = asV6();
const IPAddressV4& v4subnet = subnet.asV4();
if (v6addr.is6To4()) {
return v6addr.getIPv4For6To4().inSubnetWithMask(v4subnet, mkByteArray4());
}
} else if (subnet.isV6()) {
const IPAddressV6& v6subnet = subnet.asV6();
const IPAddressV4& v4addr = asV4();
if (v6subnet.is6To4()) {
return v4addr.inSubnetWithMask(v6subnet.getIPv4For6To4(), mkByteArray4());
}
}
return false;
}
// public
bool IPAddress::inSubnet(const IPAddress& subnet, uint8_t cidr) const {
if (bitCount() == subnet.bitCount()) {
if (isV4()) {
return asV4().inSubnet(subnet.asV4(), cidr);
} else {
return asV6().inSubnet(subnet.asV6(), cidr);
}
}
// an IPv4 address can never belong in a IPv6 subnet unless the IPv6 is a 6to4
// address and vice-versa
if (isV6()) {
const IPAddressV6& v6addr = asV6();
const IPAddressV4& v4subnet = subnet.asV4();
if (v6addr.is6To4()) {
return v6addr.getIPv4For6To4().inSubnet(v4subnet, cidr);
}
} else if (subnet.isV6()) {
const IPAddressV6& v6subnet = subnet.asV6();
const IPAddressV4& v4addr = asV4();
if (v6subnet.is6To4()) {
return v4addr.inSubnet(v6subnet.getIPv4For6To4(), cidr);
}
}
return false;
}