include/mbedtls/net_sockets.h - security/mbedtls - Rivoreo Source Code Repositories

 /**
  * \file net_sockets.h
  *
  * \brief Network communication functions
  */
 /*
  *  Copyright (C) 2006-2015, ARM Limited, All Rights Reserved
  *  SPDX-License-Identifier: Apache-2.0
  *
  *  Licensed under the Apache License, Version 2.0 (the "License"); you may
  *  not use this file except in compliance with the License.
  *  You may obtain a copy of the License at
  *
  *  http://www.apache.org/licenses/LICENSE-2.0
  *
  *  Unless required by applicable law or agreed to in writing, software
  *  distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
  *  WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
  *  See the License for the specific language governing permissions and
  *  limitations under the License.
  *
  *  This file is part of mbed TLS (https://tls.mbed.org)
  */
 #ifndef MBEDTLS_NET_SOCKETS_H
 #define MBEDTLS_NET_SOCKETS_H

 #if !defined(MBEDTLS_CONFIG_FILE)
 #include "config.h"
 #else
 #include MBEDTLS_CONFIG_FILE
 #endif

 #include "ssl.h"

 #include <stddef.h>
 #include <stdint.h>

 #define MBEDTLS_ERR_NET_SOCKET_FAILED                     -0x0042  /**< Failed to open a socket. */
 #define MBEDTLS_ERR_NET_CONNECT_FAILED                    -0x0044  /**< The connection to the given server / port failed. */
 #define MBEDTLS_ERR_NET_BIND_FAILED                       -0x0046  /**< Binding of the socket failed. */
 #define MBEDTLS_ERR_NET_LISTEN_FAILED                     -0x0048  /**< Could not listen on the socket. */
 #define MBEDTLS_ERR_NET_ACCEPT_FAILED                     -0x004A  /**< Could not accept the incoming connection. */
 #define MBEDTLS_ERR_NET_RECV_FAILED                       -0x004C  /**< Reading information from the socket failed. */
 #define MBEDTLS_ERR_NET_SEND_FAILED                       -0x004E  /**< Sending information through the socket failed. */
 #define MBEDTLS_ERR_NET_CONN_RESET                        -0x0050  /**< Connection was reset by peer. */
 #define MBEDTLS_ERR_NET_UNKNOWN_HOST                      -0x0052  /**< Failed to get an IP address for the given hostname. */
 #define MBEDTLS_ERR_NET_BUFFER_TOO_SMALL                  -0x0043  /**< Buffer is too small to hold the data. */
 #define MBEDTLS_ERR_NET_INVALID_CONTEXT                   -0x0045  /**< The context is invalid, eg because it was free()ed. */
 #define MBEDTLS_ERR_NET_POLL_FAILED                       -0x0047  /**< Polling the net context failed. */
 #define MBEDTLS_ERR_NET_BAD_INPUT_DATA                    -0x0049  /**< Input invalid. */

 #define MBEDTLS_NET_LISTEN_BACKLOG         10 /**< The backlog that listen() should use. */

 #define MBEDTLS_NET_PROTO_TCP 0 /**< The TCP transport protocol */
 #define MBEDTLS_NET_PROTO_UDP 1 /**< The UDP transport protocol */

 #define MBEDTLS_NET_POLL_READ  1 /**< Used in \c mbedtls_net_poll to check for pending data  */
 #define MBEDTLS_NET_POLL_WRITE 2 /**< Used in \c mbedtls_net_poll to check if write possible */

 #ifdef __cplusplus
 extern "C" {
 #endif

 /**
  * Wrapper type for sockets.
  *
  * Currently backed by just a file descriptor, but might be more in the future
  * (eg two file descriptors for combined IPv4 + IPv6 support, or additional
  * structures for hand-made UDP demultiplexing).
  */
 typedef struct
 {
     int fd;             /**< The underlying file descriptor                 */
 }
 mbedtls_net_context;

 /**
  * \brief          Initialize a context
  *                 Just makes the context ready to be used or freed safely.
  *
  * \param ctx      Context to initialize
  */
 void mbedtls_net_init( mbedtls_net_context *ctx );

 /**
  * \brief          Initiate a connection with host:port in the given protocol
  *
  * \param ctx      Socket to use
  * \param host     Host to connect to
  * \param port     Port to connect to
  * \param proto    Protocol: MBEDTLS_NET_PROTO_TCP or MBEDTLS_NET_PROTO_UDP
  *
  * \return         0 if successful, or one of:
  *                      MBEDTLS_ERR_NET_SOCKET_FAILED,
  *                      MBEDTLS_ERR_NET_UNKNOWN_HOST,
  *                      MBEDTLS_ERR_NET_CONNECT_FAILED
  *
  * \note           Sets the socket in connected mode even with UDP.
  */
 int mbedtls_net_connect( mbedtls_net_context *ctx, const char *host, const char *port, int proto );

 /**
  * \brief          Create a receiving socket on bind_ip:port in the chosen
  *                 protocol. If bind_ip == NULL, all interfaces are bound.
  *
  * \param ctx      Socket to use
  * \param bind_ip  IP to bind to, can be NULL
  * \param port     Port number to use
  * \param proto    Protocol: MBEDTLS_NET_PROTO_TCP or MBEDTLS_NET_PROTO_UDP
  *
  * \return         0 if successful, or one of:
  *                      MBEDTLS_ERR_NET_SOCKET_FAILED,
  *                      MBEDTLS_ERR_NET_BIND_FAILED,
  *                      MBEDTLS_ERR_NET_LISTEN_FAILED
  *
  * \note           Regardless of the protocol, opens the sockets and binds it.
  *                 In addition, make the socket listening if protocol is TCP.
  */
 int mbedtls_net_bind( mbedtls_net_context *ctx, const char *bind_ip, const char *port, int proto );

 /**
  * \brief           Accept a connection from a remote client
  *
  * \param bind_ctx  Relevant socket
  * \param client_ctx Will contain the connected client socket
  * \param client_ip Will contain the client IP address, can be NULL
  * \param buf_size  Size of the client_ip buffer
  * \param ip_len    Will receive the size of the client IP written,
  *                  can be NULL if client_ip is null
  *
  * \return          0 if successful, or
  *                  MBEDTLS_ERR_NET_ACCEPT_FAILED, or
  *                  MBEDTLS_ERR_NET_BUFFER_TOO_SMALL if buf_size is too small,
  *                  MBEDTLS_ERR_SSL_WANT_READ if bind_fd was set to
  *                  non-blocking and accept() would block.
  */
 int mbedtls_net_accept( mbedtls_net_context *bind_ctx,
                         mbedtls_net_context *client_ctx,
                         void *client_ip, size_t buf_size, size_t *ip_len );

 /**
  * \brief          Check and wait for the context to be ready for read/write
  *
  * \param ctx      Socket to check
  * \param rw       Bitflag composed of MBEDTLS_NET_POLL_READ and
  *                 MBEDTLS_NET_POLL_WRITE specifying the events
  *                 to wait for:
  *                 - If MBEDTLS_NET_POLL_READ is set, the function
  *                   will return as soon as the net context is available
  *                   for reading.
  *                 - If MBEDTLS_NET_POLL_WRITE is set, the function
  *                   will return as soon as the net context is available
  *                   for writing.
  * \param timeout  Maximal amount of time to wait before returning,
  *                 in milliseconds. If \c timeout is zero, the
  *                 function returns immediately. If \c timeout is
  *                 -1u, the function blocks potentially indefinitely.
  *
  * \return         Bitmask composed of MBEDTLS_NET_POLL_READ/WRITE
  *                 on success or timeout, or a negative return code otherwise.
  */
 int mbedtls_net_poll( mbedtls_net_context *ctx, uint32_t rw, uint32_t timeout );

 /**
  * \brief          Set the socket blocking
  *
  * \param ctx      Socket to set
  *
  * \return         0 if successful, or a non-zero error code
  */
 int mbedtls_net_set_block( mbedtls_net_context *ctx );

 /**
  * \brief          Set the socket non-blocking
  *
  * \param ctx      Socket to set
  *
  * \return         0 if successful, or a non-zero error code
  */
 int mbedtls_net_set_nonblock( mbedtls_net_context *ctx );

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

 /**
  * \brief          Read at most 'len' characters. If no error occurs,
  *                 the actual amount read is returned.
  *
  * \param ctx      Socket
  * \param buf      The buffer to write to
  * \param len      Maximum length of the buffer
  *
  * \return         the number of bytes received,
  *                 or a non-zero error code; with a non-blocking socket,
  *                 MBEDTLS_ERR_SSL_WANT_READ indicates read() would block.
  */
 int mbedtls_net_recv( void *ctx, unsigned char *buf, size_t len );

 /**
  * \brief          Write at most 'len' characters. If no error occurs,
  *                 the actual amount read is returned.
  *
  * \param ctx      Socket
  * \param buf      The buffer to read from
  * \param len      The length of the buffer
  *
  * \return         the number of bytes sent,
  *                 or a non-zero error code; with a non-blocking socket,
  *                 MBEDTLS_ERR_SSL_WANT_WRITE indicates write() would block.
  */
 int mbedtls_net_send( void *ctx, const unsigned char *buf, size_t len );

 /**
  * \brief          Read at most 'len' characters, blocking for at most
  *                 'timeout' seconds. If no error occurs, the actual amount
  *                 read is returned.
  *
  * \param ctx      Socket
  * \param buf      The buffer to write to
  * \param len      Maximum length of the buffer
  * \param timeout  Maximum number of milliseconds to wait for data
  *                 0 means no timeout (wait forever)
  *
  * \return         the number of bytes received,
  *                 or a non-zero error code:
  *                 MBEDTLS_ERR_SSL_TIMEOUT if the operation timed out,
  *                 MBEDTLS_ERR_SSL_WANT_READ if interrupted by a signal.
  *
  * \note           This function will block (until data becomes available or
  *                 timeout is reached) even if the socket is set to
  *                 non-blocking. Handling timeouts with non-blocking reads
  *                 requires a different strategy.
  */
 int mbedtls_net_recv_timeout( void *ctx, unsigned char *buf, size_t len,
                       uint32_t timeout );

 /**
  * \brief          Gracefully shutdown the connection and free associated data
  *
  * \param ctx      The context to free
  */
 void mbedtls_net_free( mbedtls_net_context *ctx );

 #ifdef __cplusplus
 }
 #endif

 #endif /* net_sockets.h */
	/**
	* \file net_sockets.h
	*
	* \brief Network communication functions
	*/
	/*
	* Copyright (C) 2006-2015, ARM Limited, All Rights Reserved
	* SPDX-License-Identifier: Apache-2.0
	*
	* Licensed under the Apache License, Version 2.0 (the "License"); you may
	* not use this file except in compliance with the License.
	* You may obtain a copy of the License at
	*
	* http://www.apache.org/licenses/LICENSE-2.0
	*
	* Unless required by applicable law or agreed to in writing, software
	* distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
	* WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
	* See the License for the specific language governing permissions and
	* limitations under the License.
	*
	* This file is part of mbed TLS (https://tls.mbed.org)
	*/
	#ifndef MBEDTLS_NET_SOCKETS_H
	#define MBEDTLS_NET_SOCKETS_H

	#if !defined(MBEDTLS_CONFIG_FILE)
	#include "config.h"
	#else
	#include MBEDTLS_CONFIG_FILE
	#endif

	#include "ssl.h"

	#include <stddef.h>
	#include <stdint.h>

	#define MBEDTLS_ERR_NET_SOCKET_FAILED -0x0042 /*< Failed to open a socket. /
	#define MBEDTLS_ERR_NET_CONNECT_FAILED -0x0044 /*< The connection to the given server / port failed. /
	#define MBEDTLS_ERR_NET_BIND_FAILED -0x0046 /*< Binding of the socket failed. /
	#define MBEDTLS_ERR_NET_LISTEN_FAILED -0x0048 /*< Could not listen on the socket. /
	#define MBEDTLS_ERR_NET_ACCEPT_FAILED -0x004A /*< Could not accept the incoming connection. /
	#define MBEDTLS_ERR_NET_RECV_FAILED -0x004C /*< Reading information from the socket failed. /
	#define MBEDTLS_ERR_NET_SEND_FAILED -0x004E /*< Sending information through the socket failed. /
	#define MBEDTLS_ERR_NET_CONN_RESET -0x0050 /*< Connection was reset by peer. /
	#define MBEDTLS_ERR_NET_UNKNOWN_HOST -0x0052 /*< Failed to get an IP address for the given hostname. /
	#define MBEDTLS_ERR_NET_BUFFER_TOO_SMALL -0x0043 /*< Buffer is too small to hold the data. /
	#define MBEDTLS_ERR_NET_INVALID_CONTEXT -0x0045 /*< The context is invalid, eg because it was free()ed. /
	#define MBEDTLS_ERR_NET_POLL_FAILED -0x0047 /*< Polling the net context failed. /
	#define MBEDTLS_ERR_NET_BAD_INPUT_DATA -0x0049 /*< Input invalid. /

	#define MBEDTLS_NET_LISTEN_BACKLOG 10 /*< The backlog that listen() should use. /

	#define MBEDTLS_NET_PROTO_TCP 0 /*< The TCP transport protocol /
	#define MBEDTLS_NET_PROTO_UDP 1 /*< The UDP transport protocol /

	#define MBEDTLS_NET_POLL_READ 1 /*< Used in \c mbedtls_net_poll to check for pending data /
	#define MBEDTLS_NET_POLL_WRITE 2 /*< Used in \c mbedtls_net_poll to check if write possible /

	#ifdef __cplusplus
	extern "C" {
	#endif

	/**
	* Wrapper type for sockets.
	*
	* Currently backed by just a file descriptor, but might be more in the future
	* (eg two file descriptors for combined IPv4 + IPv6 support, or additional
	* structures for hand-made UDP demultiplexing).
	*/
	typedef struct
	{
	int fd; /*< The underlying file descriptor /
	}
	mbedtls_net_context;

	/**
	* \brief Initialize a context
	* Just makes the context ready to be used or freed safely.
	*
	* \param ctx Context to initialize
	*/
	void mbedtls_net_init( mbedtls_net_context *ctx );

	/**
	* \brief Initiate a connection with host:port in the given protocol
	*
	* \param ctx Socket to use
	* \param host Host to connect to
	* \param port Port to connect to
	* \param proto Protocol: MBEDTLS_NET_PROTO_TCP or MBEDTLS_NET_PROTO_UDP
	*
	* \return 0 if successful, or one of:
	* MBEDTLS_ERR_NET_SOCKET_FAILED,
	* MBEDTLS_ERR_NET_UNKNOWN_HOST,
	* MBEDTLS_ERR_NET_CONNECT_FAILED
	*
	* \note Sets the socket in connected mode even with UDP.
	*/
	int mbedtls_net_connect( mbedtls_net_context ctx, const char host, const char *port, int proto );

	/**
	* \brief Create a receiving socket on bind_ip:port in the chosen
	* protocol. If bind_ip == NULL, all interfaces are bound.
	*
	* \param ctx Socket to use
	* \param bind_ip IP to bind to, can be NULL
	* \param port Port number to use
	* \param proto Protocol: MBEDTLS_NET_PROTO_TCP or MBEDTLS_NET_PROTO_UDP
	*
	* \return 0 if successful, or one of:
	* MBEDTLS_ERR_NET_SOCKET_FAILED,
	* MBEDTLS_ERR_NET_BIND_FAILED,
	* MBEDTLS_ERR_NET_LISTEN_FAILED
	*
	* \note Regardless of the protocol, opens the sockets and binds it.
	* In addition, make the socket listening if protocol is TCP.
	*/
	int mbedtls_net_bind( mbedtls_net_context ctx, const char bind_ip, const char *port, int proto );

	/**
	* \brief Accept a connection from a remote client
	*
	* \param bind_ctx Relevant socket
	* \param client_ctx Will contain the connected client socket
	* \param client_ip Will contain the client IP address, can be NULL
	* \param buf_size Size of the client_ip buffer
	* \param ip_len Will receive the size of the client IP written,
	* can be NULL if client_ip is null
	*
	* \return 0 if successful, or
	* MBEDTLS_ERR_NET_ACCEPT_FAILED, or
	* MBEDTLS_ERR_NET_BUFFER_TOO_SMALL if buf_size is too small,
	* MBEDTLS_ERR_SSL_WANT_READ if bind_fd was set to
	* non-blocking and accept() would block.
	*/
	int mbedtls_net_accept( mbedtls_net_context *bind_ctx,
	mbedtls_net_context *client_ctx,
	void client_ip, size_t buf_size, size_t ip_len );

	/**
	* \brief Check and wait for the context to be ready for read/write
	*
	* \param ctx Socket to check
	* \param rw Bitflag composed of MBEDTLS_NET_POLL_READ and
	* MBEDTLS_NET_POLL_WRITE specifying the events
	* to wait for:
	* - If MBEDTLS_NET_POLL_READ is set, the function
	* will return as soon as the net context is available
	* for reading.
	* - If MBEDTLS_NET_POLL_WRITE is set, the function
	* will return as soon as the net context is available
	* for writing.
	* \param timeout Maximal amount of time to wait before returning,
	* in milliseconds. If \c timeout is zero, the
	* function returns immediately. If \c timeout is
	* -1u, the function blocks potentially indefinitely.
	*
	* \return Bitmask composed of MBEDTLS_NET_POLL_READ/WRITE
	* on success or timeout, or a negative return code otherwise.
	*/
	int mbedtls_net_poll( mbedtls_net_context *ctx, uint32_t rw, uint32_t timeout );

	/**
	* \brief Set the socket blocking
	*
	* \param ctx Socket to set
	*
	* \return 0 if successful, or a non-zero error code
	*/
	int mbedtls_net_set_block( mbedtls_net_context *ctx );

	/**
	* \brief Set the socket non-blocking
	*
	* \param ctx Socket to set
	*
	* \return 0 if successful, or a non-zero error code
	*/
	int mbedtls_net_set_nonblock( mbedtls_net_context *ctx );

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

	/**
	* \brief Read at most 'len' characters. If no error occurs,
	* the actual amount read is returned.
	*
	* \param ctx Socket
	* \param buf The buffer to write to
	* \param len Maximum length of the buffer
	*
	* \return the number of bytes received,
	* or a non-zero error code; with a non-blocking socket,
	* MBEDTLS_ERR_SSL_WANT_READ indicates read() would block.
	*/
	int mbedtls_net_recv( void ctx, unsigned char buf, size_t len );

	/**
	* \brief Write at most 'len' characters. If no error occurs,
	* the actual amount read is returned.
	*
	* \param ctx Socket
	* \param buf The buffer to read from
	* \param len The length of the buffer
	*
	* \return the number of bytes sent,
	* or a non-zero error code; with a non-blocking socket,
	* MBEDTLS_ERR_SSL_WANT_WRITE indicates write() would block.
	*/
	int mbedtls_net_send( void ctx, const unsigned char buf, size_t len );

	/**
	* \brief Read at most 'len' characters, blocking for at most
	* 'timeout' seconds. If no error occurs, the actual amount
	* read is returned.
	*
	* \param ctx Socket
	* \param buf The buffer to write to
	* \param len Maximum length of the buffer
	* \param timeout Maximum number of milliseconds to wait for data
	* 0 means no timeout (wait forever)
	*
	* \return the number of bytes received,
	* or a non-zero error code:
	* MBEDTLS_ERR_SSL_TIMEOUT if the operation timed out,
	* MBEDTLS_ERR_SSL_WANT_READ if interrupted by a signal.
	*
	* \note This function will block (until data becomes available or
	* timeout is reached) even if the socket is set to
	* non-blocking. Handling timeouts with non-blocking reads
	* requires a different strategy.
	*/
	int mbedtls_net_recv_timeout( void ctx, unsigned char buf, size_t len,
	uint32_t timeout );

	/**
	* \brief Gracefully shutdown the connection and free associated data
	*
	* \param ctx The context to free
	*/
	void mbedtls_net_free( mbedtls_net_context *ctx );

	#ifdef __cplusplus
	}
	#endif

	#endif /* net_sockets.h */