/** * \file net_sockets.h * * \brief Network communication functions */ /* * Copyright (C) 2006-2015, ARM Limited, All Rights Reserved * SPDX-License-Identifier: GPL-2.0 * * 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. * * 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 #include #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_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 */ #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 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 */