net_sockets.h 11 KB

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  1. /**
  2. * \file net_sockets.h
  3. *
  4. * \brief Network sockets abstraction layer to integrate Mbed TLS into a
  5. * BSD-style sockets API.
  6. *
  7. * The network sockets module provides an example integration of the
  8. * Mbed TLS library into a BSD sockets implementation. The module is
  9. * intended to be an example of how Mbed TLS can be integrated into a
  10. * networking stack, as well as to be Mbed TLS's network integration
  11. * for its supported platforms.
  12. *
  13. * The module is intended only to be used with the Mbed TLS library and
  14. * is not intended to be used by third party application software
  15. * directly.
  16. *
  17. * The supported platforms are as follows:
  18. * * Microsoft Windows and Windows CE
  19. * * POSIX/Unix platforms including Linux, OS X
  20. *
  21. */
  22. /*
  23. * Copyright (C) 2006-2015, ARM Limited, All Rights Reserved
  24. * SPDX-License-Identifier: Apache-2.0
  25. *
  26. * Licensed under the Apache License, Version 2.0 (the "License"); you may
  27. * not use this file except in compliance with the License.
  28. * You may obtain a copy of the License at
  29. *
  30. * http://www.apache.org/licenses/LICENSE-2.0
  31. *
  32. * Unless required by applicable law or agreed to in writing, software
  33. * distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
  34. * WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
  35. * See the License for the specific language governing permissions and
  36. * limitations under the License.
  37. *
  38. * This file is part of mbed TLS (https://tls.mbed.org)
  39. */
  40. #ifndef MBEDTLS_NET_SOCKETS_H
  41. #define MBEDTLS_NET_SOCKETS_H
  42. #if !defined(MBEDTLS_CONFIG_FILE)
  43. #include "config.h"
  44. #else
  45. #include MBEDTLS_CONFIG_FILE
  46. #endif
  47. #include "ssl.h"
  48. #include <stddef.h>
  49. #include <stdint.h>
  50. #define MBEDTLS_ERR_NET_SOCKET_FAILED -0x0042 /**< Failed to open a socket. */
  51. #define MBEDTLS_ERR_NET_CONNECT_FAILED -0x0044 /**< The connection to the given server / port failed. */
  52. #define MBEDTLS_ERR_NET_BIND_FAILED -0x0046 /**< Binding of the socket failed. */
  53. #define MBEDTLS_ERR_NET_LISTEN_FAILED -0x0048 /**< Could not listen on the socket. */
  54. #define MBEDTLS_ERR_NET_ACCEPT_FAILED -0x004A /**< Could not accept the incoming connection. */
  55. #define MBEDTLS_ERR_NET_RECV_FAILED -0x004C /**< Reading information from the socket failed. */
  56. #define MBEDTLS_ERR_NET_SEND_FAILED -0x004E /**< Sending information through the socket failed. */
  57. #define MBEDTLS_ERR_NET_CONN_RESET -0x0050 /**< Connection was reset by peer. */
  58. #define MBEDTLS_ERR_NET_UNKNOWN_HOST -0x0052 /**< Failed to get an IP address for the given hostname. */
  59. #define MBEDTLS_ERR_NET_BUFFER_TOO_SMALL -0x0043 /**< Buffer is too small to hold the data. */
  60. #define MBEDTLS_ERR_NET_INVALID_CONTEXT -0x0045 /**< The context is invalid, eg because it was free()ed. */
  61. #define MBEDTLS_ERR_NET_POLL_FAILED -0x0047 /**< Polling the net context failed. */
  62. #define MBEDTLS_ERR_NET_BAD_INPUT_DATA -0x0049 /**< Input invalid. */
  63. #define MBEDTLS_NET_LISTEN_BACKLOG 10 /**< The backlog that listen() should use. */
  64. #define MBEDTLS_NET_PROTO_TCP 0 /**< The TCP transport protocol */
  65. #define MBEDTLS_NET_PROTO_UDP 1 /**< The UDP transport protocol */
  66. #define MBEDTLS_NET_POLL_READ 1 /**< Used in \c mbedtls_net_poll to check for pending data */
  67. #define MBEDTLS_NET_POLL_WRITE 2 /**< Used in \c mbedtls_net_poll to check if write possible */
  68. #ifdef __cplusplus
  69. extern "C" {
  70. #endif
  71. /**
  72. * Wrapper type for sockets.
  73. *
  74. * Currently backed by just a file descriptor, but might be more in the future
  75. * (eg two file descriptors for combined IPv4 + IPv6 support, or additional
  76. * structures for hand-made UDP demultiplexing).
  77. */
  78. typedef struct mbedtls_net_context
  79. {
  80. int fd; /**< The underlying file descriptor */
  81. }
  82. mbedtls_net_context;
  83. /**
  84. * \brief Initialize a context
  85. * Just makes the context ready to be used or freed safely.
  86. *
  87. * \param ctx Context to initialize
  88. */
  89. void mbedtls_net_init( mbedtls_net_context *ctx );
  90. /**
  91. * \brief Initiate a connection with host:port in the given protocol
  92. *
  93. * \param ctx Socket to use
  94. * \param host Host to connect to
  95. * \param port Port to connect to
  96. * \param proto Protocol: MBEDTLS_NET_PROTO_TCP or MBEDTLS_NET_PROTO_UDP
  97. *
  98. * \return 0 if successful, or one of:
  99. * MBEDTLS_ERR_NET_SOCKET_FAILED,
  100. * MBEDTLS_ERR_NET_UNKNOWN_HOST,
  101. * MBEDTLS_ERR_NET_CONNECT_FAILED
  102. *
  103. * \note Sets the socket in connected mode even with UDP.
  104. */
  105. int mbedtls_net_connect( mbedtls_net_context *ctx, const char *host, const char *port, int proto );
  106. /**
  107. * \brief Create a receiving socket on bind_ip:port in the chosen
  108. * protocol. If bind_ip == NULL, all interfaces are bound.
  109. *
  110. * \param ctx Socket to use
  111. * \param bind_ip IP to bind to, can be NULL
  112. * \param port Port number to use
  113. * \param proto Protocol: MBEDTLS_NET_PROTO_TCP or MBEDTLS_NET_PROTO_UDP
  114. *
  115. * \return 0 if successful, or one of:
  116. * MBEDTLS_ERR_NET_SOCKET_FAILED,
  117. * MBEDTLS_ERR_NET_BIND_FAILED,
  118. * MBEDTLS_ERR_NET_LISTEN_FAILED
  119. *
  120. * \note Regardless of the protocol, opens the sockets and binds it.
  121. * In addition, make the socket listening if protocol is TCP.
  122. */
  123. int mbedtls_net_bind( mbedtls_net_context *ctx, const char *bind_ip, const char *port, int proto );
  124. /**
  125. * \brief Accept a connection from a remote client
  126. *
  127. * \param bind_ctx Relevant socket
  128. * \param client_ctx Will contain the connected client socket
  129. * \param client_ip Will contain the client IP address, can be NULL
  130. * \param buf_size Size of the client_ip buffer
  131. * \param ip_len Will receive the size of the client IP written,
  132. * can be NULL if client_ip is null
  133. *
  134. * \return 0 if successful, or
  135. * MBEDTLS_ERR_NET_ACCEPT_FAILED, or
  136. * MBEDTLS_ERR_NET_BUFFER_TOO_SMALL if buf_size is too small,
  137. * MBEDTLS_ERR_SSL_WANT_READ if bind_fd was set to
  138. * non-blocking and accept() would block.
  139. */
  140. int mbedtls_net_accept( mbedtls_net_context *bind_ctx,
  141. mbedtls_net_context *client_ctx,
  142. void *client_ip, size_t buf_size, size_t *ip_len );
  143. /**
  144. * \brief Check and wait for the context to be ready for read/write
  145. *
  146. * \param ctx Socket to check
  147. * \param rw Bitflag composed of MBEDTLS_NET_POLL_READ and
  148. * MBEDTLS_NET_POLL_WRITE specifying the events
  149. * to wait for:
  150. * - If MBEDTLS_NET_POLL_READ is set, the function
  151. * will return as soon as the net context is available
  152. * for reading.
  153. * - If MBEDTLS_NET_POLL_WRITE is set, the function
  154. * will return as soon as the net context is available
  155. * for writing.
  156. * \param timeout Maximal amount of time to wait before returning,
  157. * in milliseconds. If \c timeout is zero, the
  158. * function returns immediately. If \c timeout is
  159. * -1u, the function blocks potentially indefinitely.
  160. *
  161. * \return Bitmask composed of MBEDTLS_NET_POLL_READ/WRITE
  162. * on success or timeout, or a negative return code otherwise.
  163. */
  164. int mbedtls_net_poll( mbedtls_net_context *ctx, uint32_t rw, uint32_t timeout );
  165. /**
  166. * \brief Set the socket blocking
  167. *
  168. * \param ctx Socket to set
  169. *
  170. * \return 0 if successful, or a non-zero error code
  171. */
  172. int mbedtls_net_set_block( mbedtls_net_context *ctx );
  173. /**
  174. * \brief Set the socket non-blocking
  175. *
  176. * \param ctx Socket to set
  177. *
  178. * \return 0 if successful, or a non-zero error code
  179. */
  180. int mbedtls_net_set_nonblock( mbedtls_net_context *ctx );
  181. /**
  182. * \brief Portable usleep helper
  183. *
  184. * \param usec Amount of microseconds to sleep
  185. *
  186. * \note Real amount of time slept will not be less than
  187. * select()'s timeout granularity (typically, 10ms).
  188. */
  189. void mbedtls_net_usleep( unsigned long usec );
  190. /**
  191. * \brief Read at most 'len' characters. If no error occurs,
  192. * the actual amount read is returned.
  193. *
  194. * \param ctx Socket
  195. * \param buf The buffer to write to
  196. * \param len Maximum length of the buffer
  197. *
  198. * \return the number of bytes received,
  199. * or a non-zero error code; with a non-blocking socket,
  200. * MBEDTLS_ERR_SSL_WANT_READ indicates read() would block.
  201. */
  202. int mbedtls_net_recv( void *ctx, unsigned char *buf, size_t len );
  203. /**
  204. * \brief Write at most 'len' characters. If no error occurs,
  205. * the actual amount read is returned.
  206. *
  207. * \param ctx Socket
  208. * \param buf The buffer to read from
  209. * \param len The length of the buffer
  210. *
  211. * \return the number of bytes sent,
  212. * or a non-zero error code; with a non-blocking socket,
  213. * MBEDTLS_ERR_SSL_WANT_WRITE indicates write() would block.
  214. */
  215. int mbedtls_net_send( void *ctx, const unsigned char *buf, size_t len );
  216. /**
  217. * \brief Read at most 'len' characters, blocking for at most
  218. * 'timeout' seconds. If no error occurs, the actual amount
  219. * read is returned.
  220. *
  221. * \param ctx Socket
  222. * \param buf The buffer to write to
  223. * \param len Maximum length of the buffer
  224. * \param timeout Maximum number of milliseconds to wait for data
  225. * 0 means no timeout (wait forever)
  226. *
  227. * \return the number of bytes received,
  228. * or a non-zero error code:
  229. * MBEDTLS_ERR_SSL_TIMEOUT if the operation timed out,
  230. * MBEDTLS_ERR_SSL_WANT_READ if interrupted by a signal.
  231. *
  232. * \note This function will block (until data becomes available or
  233. * timeout is reached) even if the socket is set to
  234. * non-blocking. Handling timeouts with non-blocking reads
  235. * requires a different strategy.
  236. */
  237. int mbedtls_net_recv_timeout( void *ctx, unsigned char *buf, size_t len,
  238. uint32_t timeout );
  239. /**
  240. * \brief Gracefully shutdown the connection and free associated data
  241. *
  242. * \param ctx The context to free
  243. */
  244. void mbedtls_net_free( mbedtls_net_context *ctx );
  245. #ifdef __cplusplus
  246. }
  247. #endif
  248. #endif /* net_sockets.h */