4 * \brief Network communication functions
6 * Copyright (C) 2006-2015, ARM Limited, All Rights Reserved
7 * SPDX-License-Identifier: Apache-2.0
9 * Licensed under the Apache License, Version 2.0 (the "License"); you may
10 * not use this file except in compliance with the License.
11 * You may obtain a copy of the License at
13 * http://www.apache.org/licenses/LICENSE-2.0
15 * Unless required by applicable law or agreed to in writing, software
16 * distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
17 * WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
18 * See the License for the specific language governing permissions and
19 * limitations under the License.
21 * This file is part of mbed TLS (https://tls.mbed.org)
23 #ifndef MBEDTLS_NET_SOCKETS_H
24 #define MBEDTLS_NET_SOCKETS_H
26 #if !defined(MBEDTLS_CONFIG_FILE)
29 #include MBEDTLS_CONFIG_FILE
37 #define MBEDTLS_ERR_NET_SOCKET_FAILED -0x0042 /**< Failed to open a socket. */
38 #define MBEDTLS_ERR_NET_CONNECT_FAILED -0x0044 /**< The connection to the given server / port failed. */
39 #define MBEDTLS_ERR_NET_BIND_FAILED -0x0046 /**< Binding of the socket failed. */
40 #define MBEDTLS_ERR_NET_LISTEN_FAILED -0x0048 /**< Could not listen on the socket. */
41 #define MBEDTLS_ERR_NET_ACCEPT_FAILED -0x004A /**< Could not accept the incoming connection. */
42 #define MBEDTLS_ERR_NET_RECV_FAILED -0x004C /**< Reading information from the socket failed. */
43 #define MBEDTLS_ERR_NET_SEND_FAILED -0x004E /**< Sending information through the socket failed. */
44 #define MBEDTLS_ERR_NET_CONN_RESET -0x0050 /**< Connection was reset by peer. */
45 #define MBEDTLS_ERR_NET_UNKNOWN_HOST -0x0052 /**< Failed to get an IP address for the given hostname. */
46 #define MBEDTLS_ERR_NET_BUFFER_TOO_SMALL -0x0043 /**< Buffer is too small to hold the data. */
47 #define MBEDTLS_ERR_NET_INVALID_CONTEXT -0x0045 /**< The context is invalid, eg because it was free()ed. */
49 #define MBEDTLS_NET_LISTEN_BACKLOG 10 /**< The backlog that listen() should use. */
51 #define MBEDTLS_NET_PROTO_TCP 0 /**< The TCP transport protocol */
52 #define MBEDTLS_NET_PROTO_UDP 1 /**< The UDP transport protocol */
59 * Wrapper type for sockets.
61 * Currently backed by just a file descriptor, but might be more in the future
62 * (eg two file descriptors for combined IPv4 + IPv6 support, or additional
63 * structures for hand-made UDP demultiplexing).
67 int fd; /**< The underlying file descriptor */
72 * \brief Initialize a context
73 * Just makes the context ready to be used or freed safely.
75 * \param ctx Context to initialize
77 void mbedtls_net_init( mbedtls_net_context *ctx );
80 * \brief Initiate a connection with host:port in the given protocol
82 * \param ctx Socket to use
83 * \param host Host to connect to
84 * \param port Port to connect to
85 * \param proto Protocol: MBEDTLS_NET_PROTO_TCP or MBEDTLS_NET_PROTO_UDP
87 * \return 0 if successful, or one of:
88 * MBEDTLS_ERR_NET_SOCKET_FAILED,
89 * MBEDTLS_ERR_NET_UNKNOWN_HOST,
90 * MBEDTLS_ERR_NET_CONNECT_FAILED
92 * \note Sets the socket in connected mode even with UDP.
94 int mbedtls_net_connect( mbedtls_net_context *ctx, const char *host, const char *port, int proto );
97 * \brief Create a receiving socket on bind_ip:port in the chosen
98 * protocol. If bind_ip == NULL, all interfaces are bound.
100 * \param ctx Socket to use
101 * \param bind_ip IP to bind to, can be NULL
102 * \param port Port number to use
103 * \param proto Protocol: MBEDTLS_NET_PROTO_TCP or MBEDTLS_NET_PROTO_UDP
105 * \return 0 if successful, or one of:
106 * MBEDTLS_ERR_NET_SOCKET_FAILED,
107 * MBEDTLS_ERR_NET_BIND_FAILED,
108 * MBEDTLS_ERR_NET_LISTEN_FAILED
110 * \note Regardless of the protocol, opens the sockets and binds it.
111 * In addition, make the socket listening if protocol is TCP.
113 int mbedtls_net_bind( mbedtls_net_context *ctx, const char *bind_ip, const char *port, int proto );
116 * \brief Accept a connection from a remote client
118 * \param bind_ctx Relevant socket
119 * \param client_ctx Will contain the connected client socket
120 * \param client_ip Will contain the client IP address
121 * \param buf_size Size of the client_ip buffer
122 * \param ip_len Will receive the size of the client IP written
124 * \return 0 if successful, or
125 * MBEDTLS_ERR_NET_ACCEPT_FAILED, or
126 * MBEDTLS_ERR_NET_BUFFER_TOO_SMALL if buf_size is too small,
127 * MBEDTLS_ERR_SSL_WANT_READ if bind_fd was set to
128 * non-blocking and accept() would block.
130 int mbedtls_net_accept( mbedtls_net_context *bind_ctx,
131 mbedtls_net_context *client_ctx,
132 void *client_ip, size_t buf_size, size_t *ip_len );
135 * \brief Set the socket blocking
137 * \param ctx Socket to set
139 * \return 0 if successful, or a non-zero error code
141 int mbedtls_net_set_block( mbedtls_net_context *ctx );
144 * \brief Set the socket non-blocking
146 * \param ctx Socket to set
148 * \return 0 if successful, or a non-zero error code
150 int mbedtls_net_set_nonblock( mbedtls_net_context *ctx );
153 * \brief Portable usleep helper
155 * \param usec Amount of microseconds to sleep
157 * \note Real amount of time slept will not be less than
158 * select()'s timeout granularity (typically, 10ms).
160 void mbedtls_net_usleep( unsigned long usec );
163 * \brief Read at most 'len' characters. If no error occurs,
164 * the actual amount read is returned.
167 * \param buf The buffer to write to
168 * \param len Maximum length of the buffer
170 * \return the number of bytes received,
171 * or a non-zero error code; with a non-blocking socket,
172 * MBEDTLS_ERR_SSL_WANT_READ indicates read() would block.
174 int mbedtls_net_recv( void *ctx, unsigned char *buf, size_t len );
177 * \brief Write at most 'len' characters. If no error occurs,
178 * the actual amount read is returned.
181 * \param buf The buffer to read from
182 * \param len The length of the buffer
184 * \return the number of bytes sent,
185 * or a non-zero error code; with a non-blocking socket,
186 * MBEDTLS_ERR_SSL_WANT_WRITE indicates write() would block.
188 int mbedtls_net_send( void *ctx, const unsigned char *buf, size_t len );
191 * \brief Read at most 'len' characters, blocking for at most
192 * 'timeout' seconds. If no error occurs, the actual amount
196 * \param buf The buffer to write to
197 * \param len Maximum length of the buffer
198 * \param timeout Maximum number of milliseconds to wait for data
199 * 0 means no timeout (wait forever)
201 * \return the number of bytes received,
202 * or a non-zero error code:
203 * MBEDTLS_ERR_SSL_TIMEOUT if the operation timed out,
204 * MBEDTLS_ERR_SSL_WANT_READ if interrupted by a signal.
206 * \note This function will block (until data becomes available or
207 * timeout is reached) even if the socket is set to
208 * non-blocking. Handling timeouts with non-blocking reads
209 * requires a different strategy.
211 int mbedtls_net_recv_timeout( void *ctx, unsigned char *buf, size_t len,
215 * \brief Gracefully shutdown the connection and free associated data
217 * \param ctx The context to free
219 void mbedtls_net_free( mbedtls_net_context *ctx );
225 #endif /* net_sockets.h */