ClickHouse/src/Common/IPv6ToBinary.h

#pragma once
#include <array>
#include <base/types.h>

namespace Poco { namespace Net { class IPAddress; }}

namespace DB
{

/// Convert IP address to raw binary with IPv6 data (big endian). If it's an IPv4, map it to IPv6.
/// Saves result into the first 16 bytes of `res`.
void IPv6ToRawBinary(const Poco::Net::IPAddress & address, char * res);

/// Convert IP address to 16-byte array with IPv6 data (big endian). If it's an IPv4, map it to IPv6.
std::array<char, 16> IPv6ToBinary(const Poco::Net::IPAddress & address);

/// Returns a reference to 16-byte array containing mask with first `prefix_len` bits set to `1` and `128 - prefix_len` to `0`.
/// The reference is valid during all program execution time.
/// Values of prefix_len greater than 128 interpreted as 128 exactly.
const std::array<uint8_t, 16> & getCIDRMaskIPv6(UInt8 prefix_len);

/// Check that address contained in CIDR range
bool matchIPv4Subnet(UInt32 addr, UInt32 cidr_addr, UInt8 prefix);
bool matchIPv6Subnet(const uint8_t * addr, const uint8_t * cidr_addr, UInt8 prefix);

}