/**
 * \file net.h
 *
 *  Based on XySSL: Copyright (C) 2006-2008  Christophe Devine
 *
 *  Copyright (C) 2009       Paul Bakker
 *
 *  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.
 */
#ifndef POLARSSL_NET_H
#define POLARSSL_NET_H

#define POLARSSL_ERR_NET_UNKNOWN_HOST                      -0x0F00
#define POLARSSL_ERR_NET_SOCKET_FAILED                     -0x0F10
#define POLARSSL_ERR_NET_CONNECT_FAILED                    -0x0F20
#define POLARSSL_ERR_NET_BIND_FAILED                       -0x0F30
#define POLARSSL_ERR_NET_LISTEN_FAILED                     -0x0F40
#define POLARSSL_ERR_NET_ACCEPT_FAILED                     -0x0F50
#define POLARSSL_ERR_NET_RECV_FAILED                       -0x0F60
#define POLARSSL_ERR_NET_SEND_FAILED                       -0x0F70
#define POLARSSL_ERR_NET_CONN_RESET                        -0x0F80
#define POLARSSL_ERR_NET_TRY_AGAIN                         -0x0F90

#ifdef __cplusplus
extern "C" {
#endif

/**
 * \brief          Initiate a TCP connection with host:port
 *
 * \return         0 if successful, or one of:
 *                      POLARSSL_ERR_NET_SOCKET_FAILED,
 *                      POLARSSL_ERR_NET_UNKNOWN_HOST,
 *                      POLARSSL_ERR_NET_CONNECT_FAILED
 */
int net_connect( int *fd, char *host, int port );

/**
 * \brief          Create a listening socket on bind_ip:port.
 *                 If bind_ip == NULL, all interfaces are binded.
 *
 * \return         0 if successful, or one of:
 *                      POLARSSL_ERR_NET_SOCKET_FAILED,
 *                      POLARSSL_ERR_NET_BIND_FAILED,
 *                      POLARSSL_ERR_NET_LISTEN_FAILED
 */
int net_bind( int *fd, char *bind_ip, int port );

/**
 * \brief          Accept a connection from a remote client
 *
 * \return         0 if successful, POLARSSL_ERR_NET_ACCEPT_FAILED, or
 *                 POLARSSL_ERR_NET_WOULD_BLOCK is bind_fd was set to
 *                 non-blocking and accept() is blocking.
 */
int net_accept( int bind_fd, int *client_fd, void *client_ip );

/**
 * \brief          Set the socket blocking
 *
 * \return         0 if successful, or a non-zero error code
 */
int net_set_block( int fd );

/**
 * \brief          Set the socket non-blocking
 *
 * \return         0 if successful, or a non-zero error code
 */
int net_set_nonblock( int fd );

/**
 * \brief          Portable usleep helper
 *
 * \note           Real amount of time slept will not be less than
 *                 select()'s timeout granularity (typically, 10ms).
 */
void net_usleep( unsigned long usec );

/**
 * \brief          Read at most 'len' characters. len is updated to
 *                 reflect the actual number of characters read.
 *
 * \return         This function returns the number of bytes received,
 *                 or a negative error code; POLARSSL_ERR_NET_TRY_AGAIN
 *                 indicates read() is blocking.
 */
int net_recv( void *ctx, unsigned char *buf, int len );

/**
 * \brief          Write at most 'len' characters. len is updated to
 *                 reflect the number of characters _not_ written.
 *
 * \return         This function returns the number of bytes sent,
 *                 or a negative error code; POLARSSL_ERR_NET_TRY_AGAIN
 *                 indicates write() is blocking.
 */
int net_send( void *ctx, unsigned char *buf, int len );

/**
 * \brief          Gracefully shutdown the connection
 */
void net_close( int fd );

#ifdef __cplusplus
}
#endif

#endif /* net.h */