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/*
* Hedgewars, a free turn based strategy game
* Copyright (C) 2012 Simeon Maxein <smaxein@googlemail.com>
*
* 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 2
* 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, write to the Free Software
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
*/
/*
* Sockets for TCP networking.
*
* This layer offers some functionality over what SDL_net offers directly: listening
* sockets (called acceptors here) can be bound to port 0, which will make them listen
* on a random unused port, if one can be found. To support this feature, you can also
* query the local port that an acceptor is listening on.
*
* Further, we support nonblocking reads here.
*/
#ifndef SOCKET_H_
#define SOCKET_H_
#include <stdbool.h>
#include <stdint.h>
typedef struct _flib_tcpsocket flib_tcpsocket;
typedef struct _flib_acceptor flib_acceptor;
/**
* Create a new acceptor which will listen for incoming TCP connections
* on the given port. If port is 0, this will listen on a random
* unused port which can then be queried with flib_acceptor_listenport.
*
* Returns NULL on error.
*/
flib_acceptor *flib_acceptor_create(uint16_t port);
/**
* Return the port on which the acceptor is listening.
*/
uint16_t flib_acceptor_listenport(flib_acceptor *acceptor);
/**
* Close the acceptor and free its memory. NULL-safe.
*/
void flib_acceptor_close(flib_acceptor *acceptor);
/**
* Try to accept a connection from an acceptor (listening socket).
* if localOnly is true, this will only accept connections which came from 127.0.0.1
* Returns NULL if nothing can be accepted.
*/
flib_tcpsocket *flib_socket_accept(flib_acceptor *acceptor, bool localOnly);
/**
* Try to connect to the server at the given address.
*/
flib_tcpsocket *flib_socket_connect(const char *host, uint16_t port);
/**
* Close the socket and free its memory. NULL-safe.
*/
void flib_socket_close(flib_tcpsocket *socket);
/**
* Attempt to receive up to maxlen bytes from the socket, but does not
* block if nothing is available.
* Returns the ammount of data received, 0 if there was nothing to receive,
* or a negative number if the connection was closed or an error occurred.
*/
int flib_socket_nbrecv(flib_tcpsocket *sock, void *data, int maxlen);
/**
* Blocking send all the data in the data buffer. Returns the actual ammount
* of data sent, or a negative value on error. If the value returned here
* is less than len, either the connection closed or an error occurred.
*/
int flib_socket_send(flib_tcpsocket *sock, const void *data, int len);
#endif /* SOCKET_H_ */
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