pcp.h

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// Copyright (c) 2024-present The Bitcoin Core developers
// Distributed under the MIT software license, see the accompanying
// file COPYING or https://www.opensource.org/licenses/mit-license.php.

#ifndef BITCOIN_COMMON_PCP_H
#define BITCOIN_COMMON_PCP_H

#include <netaddress.h>
#include <util/threadinterrupt.h>

#include <variant>

// RFC6886 NAT-PMP and RFC6887 Port Control Protocol (PCP) implementation.
// NAT-PMP and PCP use network byte order (big-endian).

constexpr size_t PCP_MAP_NONCE_SIZE = 12;

typedef std::array<uint8_t, PCP_MAP_NONCE_SIZE> PCPMappingNonce;

enum class MappingError {
    NETWORK_ERROR,  
    PROTOCOL_ERROR, 
    UNSUPP_VERSION, 
    NO_RESOURCES,   
};

struct MappingResult {
    MappingResult(uint8_t version, const CService &internal_in, const CService &external_in, uint32_t lifetime_in):
        version(version), internal(internal_in), external(external_in), lifetime(lifetime_in) {}
    uint8_t version;
    CService internal;
    CService external;
    uint32_t lifetime;

    std::string ToString() const;
};

std::variant<MappingResult, MappingError> NATPMPRequestPortMap(const CNetAddr &gateway, uint16_t port, uint32_t lifetime, CThreadInterrupt& interrupt, int num_tries = 3, std::chrono::milliseconds timeout_per_try = std::chrono::milliseconds(1000));

std::variant<MappingResult, MappingError> PCPRequestPortMap(const PCPMappingNonce &nonce, const CNetAddr &gateway, const CNetAddr &bind, uint16_t port, uint32_t lifetime, CThreadInterrupt& interrupt, int num_tries = 3, std::chrono::milliseconds timeout_per_try = std::chrono::milliseconds(1000));

#endif // BITCOIN_COMMON_PCP_H