272 lines
11 KiB
C
272 lines
11 KiB
C
/**
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* \file net_sockets.h
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*
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* \brief Network sockets abstraction layer to integrate Mbed TLS into a
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* BSD-style sockets API.
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*
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* The network sockets module provides an example integration of the
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* Mbed TLS library into a BSD sockets implementation. The module is
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* intended to be an example of how Mbed TLS can be integrated into a
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* networking stack, as well as to be Mbed TLS's network integration
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* for its supported platforms.
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*
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* The module is intended only to be used with the Mbed TLS library and
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* is not intended to be used by third party application software
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* directly.
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*
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* The supported platforms are as follows:
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* * Microsoft Windows and Windows CE
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* * POSIX/Unix platforms including Linux, OS X
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*
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*/
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/*
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* Copyright (C) 2006-2015, ARM Limited, All Rights Reserved
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* SPDX-License-Identifier: Apache-2.0
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*
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* Licensed under the Apache License, Version 2.0 (the "License"); you may
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* not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
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* WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*
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* This file is part of mbed TLS (https://tls.mbed.org)
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*/
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#ifndef MBEDTLS_NET_SOCKETS_H
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#define MBEDTLS_NET_SOCKETS_H
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#if !defined(MBEDTLS_CONFIG_FILE)
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#include "config.h"
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#else
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#include MBEDTLS_CONFIG_FILE
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#endif
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#include "ssl.h"
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#include <stddef.h>
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#include <stdint.h>
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#define MBEDTLS_ERR_NET_SOCKET_FAILED -0x0042 /**< Failed to open a socket. */
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#define MBEDTLS_ERR_NET_CONNECT_FAILED -0x0044 /**< The connection to the given server / port failed. */
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#define MBEDTLS_ERR_NET_BIND_FAILED -0x0046 /**< Binding of the socket failed. */
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#define MBEDTLS_ERR_NET_LISTEN_FAILED -0x0048 /**< Could not listen on the socket. */
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#define MBEDTLS_ERR_NET_ACCEPT_FAILED -0x004A /**< Could not accept the incoming connection. */
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#define MBEDTLS_ERR_NET_RECV_FAILED -0x004C /**< Reading information from the socket failed. */
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#define MBEDTLS_ERR_NET_SEND_FAILED -0x004E /**< Sending information through the socket failed. */
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#define MBEDTLS_ERR_NET_CONN_RESET -0x0050 /**< Connection was reset by peer. */
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#define MBEDTLS_ERR_NET_UNKNOWN_HOST -0x0052 /**< Failed to get an IP address for the given hostname. */
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#define MBEDTLS_ERR_NET_BUFFER_TOO_SMALL -0x0043 /**< Buffer is too small to hold the data. */
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#define MBEDTLS_ERR_NET_INVALID_CONTEXT -0x0045 /**< The context is invalid, eg because it was free()ed. */
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#define MBEDTLS_ERR_NET_POLL_FAILED -0x0047 /**< Polling the net context failed. */
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#define MBEDTLS_ERR_NET_BAD_INPUT_DATA -0x0049 /**< Input invalid. */
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#define MBEDTLS_NET_LISTEN_BACKLOG 10 /**< The backlog that listen() should use. */
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#define MBEDTLS_NET_PROTO_TCP 0 /**< The TCP transport protocol */
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#define MBEDTLS_NET_PROTO_UDP 1 /**< The UDP transport protocol */
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#define MBEDTLS_NET_POLL_READ 1 /**< Used in \c mbedtls_net_poll to check for pending data */
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#define MBEDTLS_NET_POLL_WRITE 2 /**< Used in \c mbedtls_net_poll to check if write possible */
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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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* Wrapper type for sockets.
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*
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* Currently backed by just a file descriptor, but might be more in the future
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* (eg two file descriptors for combined IPv4 + IPv6 support, or additional
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* structures for hand-made UDP demultiplexing).
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*/
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typedef struct mbedtls_net_context
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{
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int fd; /**< The underlying file descriptor */
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}
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mbedtls_net_context;
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/**
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* \brief Initialize a context
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* Just makes the context ready to be used or freed safely.
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*
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* \param ctx Context to initialize
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*/
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void mbedtls_net_init( mbedtls_net_context *ctx );
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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 ctx 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: MBEDTLS_NET_PROTO_TCP or MBEDTLS_NET_PROTO_UDP
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*
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* \return 0 if successful, or one of:
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* MBEDTLS_ERR_NET_SOCKET_FAILED,
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* MBEDTLS_ERR_NET_UNKNOWN_HOST,
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* MBEDTLS_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 mbedtls_net_connect( mbedtls_net_context *ctx, const char *host, const char *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 ctx 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: MBEDTLS_NET_PROTO_TCP or MBEDTLS_NET_PROTO_UDP
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*
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* \return 0 if successful, or one of:
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* MBEDTLS_ERR_NET_SOCKET_FAILED,
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* MBEDTLS_ERR_NET_BIND_FAILED,
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* MBEDTLS_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 mbedtls_net_bind( mbedtls_net_context *ctx, const char *bind_ip, const char *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_ctx Relevant socket
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* \param client_ctx Will contain the connected client socket
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* \param client_ip Will contain the client IP address, can be NULL
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* \param buf_size Size of the client_ip buffer
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* \param ip_len Will receive the size of the client IP written,
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* can be NULL if client_ip is null
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*
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* \return 0 if successful, or
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* MBEDTLS_ERR_NET_ACCEPT_FAILED, or
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* MBEDTLS_ERR_NET_BUFFER_TOO_SMALL if buf_size is too small,
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* MBEDTLS_ERR_SSL_WANT_READ if bind_fd was set to
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* non-blocking and accept() would block.
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*/
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int mbedtls_net_accept( mbedtls_net_context *bind_ctx,
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mbedtls_net_context *client_ctx,
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void *client_ip, size_t buf_size, size_t *ip_len );
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/**
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* \brief Check and wait for the context to be ready for read/write
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*
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* \param ctx Socket to check
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* \param rw Bitflag composed of MBEDTLS_NET_POLL_READ and
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* MBEDTLS_NET_POLL_WRITE specifying the events
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* to wait for:
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* - If MBEDTLS_NET_POLL_READ is set, the function
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* will return as soon as the net context is available
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* for reading.
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* - If MBEDTLS_NET_POLL_WRITE is set, the function
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* will return as soon as the net context is available
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* for writing.
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* \param timeout Maximal amount of time to wait before returning,
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* in milliseconds. If \c timeout is zero, the
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* function returns immediately. If \c timeout is
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* -1u, the function blocks potentially indefinitely.
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*
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* \return Bitmask composed of MBEDTLS_NET_POLL_READ/WRITE
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* on success or timeout, or a negative return code otherwise.
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*/
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int mbedtls_net_poll( mbedtls_net_context *ctx, uint32_t rw, uint32_t timeout );
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/**
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* \brief Set the socket blocking
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*
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* \param ctx 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 mbedtls_net_set_block( mbedtls_net_context *ctx );
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/**
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* \brief Set the socket non-blocking
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*
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* \param ctx 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 mbedtls_net_set_nonblock( mbedtls_net_context *ctx );
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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 mbedtls_net_usleep( unsigned long usec );
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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 the number of bytes received,
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* or a non-zero error code; with a non-blocking socket,
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* MBEDTLS_ERR_SSL_WANT_READ indicates read() would block.
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*/
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int mbedtls_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 the number of bytes sent,
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* or a non-zero error code; with a non-blocking socket,
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* MBEDTLS_ERR_SSL_WANT_WRITE indicates write() would block.
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*/
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int mbedtls_net_send( void *ctx, const unsigned char *buf, size_t len );
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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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* 0 means no timeout (wait forever)
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*
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* \return the number of bytes received,
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* or a non-zero error code:
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* MBEDTLS_ERR_SSL_TIMEOUT if the operation timed out,
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* MBEDTLS_ERR_SSL_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 mbedtls_net_recv_timeout( void *ctx, unsigned char *buf, size_t len,
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uint32_t timeout );
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/**
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* \brief Gracefully shutdown the connection and free associated data
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*
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* \param ctx The context to free
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*/
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void mbedtls_net_free( mbedtls_net_context *ctx );
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#ifdef __cplusplus
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}
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#endif
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#endif /* net_sockets.h */
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