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218 lines
8 KiB
C
218 lines
8 KiB
C
/**
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* \file net.h
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*
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* \brief Network communication functions
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*
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* Copyright (C) 2006-2011, Brainspark B.V.
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*
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* This file is part of PolarSSL (http://www.polarssl.org)
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* Lead Maintainer: Paul Bakker <polarssl_maintainer at polarssl.org>
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*
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* All rights reserved.
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License along
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* with this program; if not, write to the Free Software Foundation, Inc.,
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* 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
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*/
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#ifndef POLARSSL_NET_H
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#define POLARSSL_NET_H
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#if !defined(POLARSSL_CONFIG_FILE)
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#include "config.h"
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#else
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#include POLARSSL_CONFIG_FILE
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#endif
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#include <string.h>
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#if defined(POLARSSL_HAVE_TIME)
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#if defined(_MSC_VER) && !defined(EFIX64) && !defined(EFI32)
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#include <basetsd.h>
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typedef UINT32 uint32_t;
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#else
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#include <inttypes.h>
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#endif
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#endif /* POLARSSL_HAVE_TIME */
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#define POLARSSL_ERR_NET_SOCKET_FAILED -0x0042 /**< Failed to open a socket. */
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#define POLARSSL_ERR_NET_CONNECT_FAILED -0x0044 /**< The connection to the given server / port failed. */
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#define POLARSSL_ERR_NET_BIND_FAILED -0x0046 /**< Binding of the socket failed. */
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#define POLARSSL_ERR_NET_LISTEN_FAILED -0x0048 /**< Could not listen on the socket. */
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#define POLARSSL_ERR_NET_ACCEPT_FAILED -0x004A /**< Could not accept the incoming connection. */
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#define POLARSSL_ERR_NET_RECV_FAILED -0x004C /**< Reading information from the socket failed. */
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#define POLARSSL_ERR_NET_SEND_FAILED -0x004E /**< Sending information through the socket failed. */
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#define POLARSSL_ERR_NET_CONN_RESET -0x0050 /**< Connection was reset by peer. */
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#define POLARSSL_ERR_NET_WANT_READ -0x0052 /**< Connection requires a read call. */
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#define POLARSSL_ERR_NET_WANT_WRITE -0x0054 /**< Connection requires a write call. */
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#define POLARSSL_ERR_NET_UNKNOWN_HOST -0x0056 /**< Failed to get an IP address for the given hostname. */
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#define POLARSSL_ERR_NET_TIMEOUT -0x0011 /**< The operation timed out. */
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#define POLARSSL_NET_LISTEN_BACKLOG 10 /**< The backlog that listen() should use. */
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#define NET_PROTO_TCP 0 /**< The TCP transport protocol */
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#define NET_PROTO_UDP 1 /**< The UDP transport protocol */
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#ifdef __cplusplus
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extern "C" {
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#endif
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/**
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* \brief Initiate a connection with host:port in the given protocol
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*
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* \param fd Socket to use
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* \param host Host to connect to
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* \param port Port to connect to
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* \param proto Protocol: NET_PROTO_TCP or NET_PROTO_UDP
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*
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* \return 0 if successful, or one of:
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* POLARSSL_ERR_NET_SOCKET_FAILED,
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* POLARSSL_ERR_NET_UNKNOWN_HOST,
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* POLARSSL_ERR_NET_CONNECT_FAILED
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*
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* \note Sets the socket in connected mode even with UDP.
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*/
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int net_connect( int *fd, const char *host, int port, int proto );
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/**
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* \brief Create a receiving socket on bind_ip:port in the chosen
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* protocol. If bind_ip == NULL, all interfaces are bound.
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*
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* \param fd Socket to use
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* \param bind_ip IP to bind to, can be NULL
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* \param port Port number to use
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* \param proto Protocol: NET_PROTO_TCP or NET_PROTO_UDP
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*
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* \return 0 if successful, or one of:
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* POLARSSL_ERR_NET_SOCKET_FAILED,
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* POLARSSL_ERR_NET_BIND_FAILED,
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* POLARSSL_ERR_NET_LISTEN_FAILED
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*
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* \note Regardless of the protocol, opens the sockets and binds it.
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* In addition, make the socket listening if protocol is TCP.
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*/
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int net_bind( int *fd, const char *bind_ip, int port, int proto );
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/**
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* \brief Accept a connection from a remote client
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*
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* \param bind_fd Relevant socket
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* \param client_fd Will contain the connected client socket
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* \param client_ip Will contain the client IP address
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* Must be at least 4 bytes, or 16 if IPv6 is supported
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*
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* \return 0 if successful, POLARSSL_ERR_NET_ACCEPT_FAILED, or
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* POLARSSL_ERR_NET_WANT_READ is bind_fd was set to
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* non-blocking and accept() is blocking.
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*
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* \note With UDP, connects the bind_fd to the client and just copy
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* its descriptor to client_fd. New clients will not be able
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* to connect until you close the socket and bind a new one.
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*/
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int net_accept( int bind_fd, int *client_fd, void *client_ip );
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/**
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* \brief Set the socket blocking
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*
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* \param fd Socket to set
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*
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* \return 0 if successful, or a non-zero error code
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*/
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int net_set_block( int fd );
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/**
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* \brief Set the socket non-blocking
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*
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* \param fd Socket to set
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*
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* \return 0 if successful, or a non-zero error code
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*/
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int net_set_nonblock( int fd );
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#if defined(POLARSSL_HAVE_TIME)
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/**
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* \brief Portable usleep helper
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*
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* \param usec Amount of microseconds to sleep
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*
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* \note Real amount of time slept will not be less than
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* select()'s timeout granularity (typically, 10ms).
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*/
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void net_usleep( unsigned long usec );
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#endif
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/**
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* \brief Read at most 'len' characters. If no error occurs,
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* the actual amount read is returned.
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*
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* \param ctx Socket
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* \param buf The buffer to write to
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* \param len Maximum length of the buffer
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*
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* \return This function returns the number of bytes received,
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* or a non-zero error code; POLARSSL_ERR_NET_WANT_READ
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* indicates read() is blocking.
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*/
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int net_recv( void *ctx, unsigned char *buf, size_t len );
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/**
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* \brief Write at most 'len' characters. If no error occurs,
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* the actual amount read is returned.
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*
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* \param ctx Socket
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* \param buf The buffer to read from
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* \param len The length of the buffer
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*
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* \return This function returns the number of bytes sent,
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* or a non-zero error code; POLARSSL_ERR_NET_WANT_WRITE
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* indicates write() is blocking.
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*/
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int net_send( void *ctx, const unsigned char *buf, size_t len );
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#if defined(POLARSSL_HAVE_TIME)
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/**
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* \brief Read at most 'len' characters, blocking for at most
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* 'timeout' seconds. If no error occurs, the actual amount
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* read is returned.
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*
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* \param ctx Socket
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* \param buf The buffer to write to
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* \param len Maximum length of the buffer
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* \param timeout Maximum number of milliseconds to wait for data
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*
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* \return This function returns the number of bytes received,
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* or a non-zero error code:
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* POLARSSL_ERR_NET_TIMEOUT if the operation timed out,
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* POLARSSL_ERR_NET_WANT_READ if interrupted by a signal.
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*
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* \note This function will block (until data becomes available or
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* timeout is reached) even if the socket is set to
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* non-blocking. Handling timeouts with non-blocking reads
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* requires a different strategy.
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*/
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int net_recv_timeout( void *ctx, unsigned char *buf, size_t len,
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uint32_t timeout );
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#endif /* POLARSSL_HAVE_TIME */
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/**
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* \brief Gracefully shutdown the connection
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*
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* \param fd The socket to close
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*/
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void net_close( int fd );
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#ifdef __cplusplus
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}
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#endif
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#endif /* net.h */
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