/* SPDX-License-Identifier: GPL-3.0-or-later */

#pragma once

#include <netinet/in.h>
#include <stdint.h>

//
// This module implements a peer-to-peer(ish) UDP connection where one side binds
// a port and waits for the other side to connect from a specific IP address.
//
// Both sockets have IP_PMTUDISC_DO set, meaning packets larger than the
// path MTU will be dropped or fail with EMSGSIZE.
//

/// Bind to a UDP port and wait for handshake from the specified ip.
/// Returns sockfd on success, -1 on failure (errno is set).
int p2p_bind(uint16_t port, in_addr_t ip);

/// Connect to a peer-to-peer UDP socket. Timeout is in milliseconds.
/// Returns sockfd on success, -1 on failure (errno is set).
int p2p_connect(uint16_t port, in_addr_t ip, int timeout);