2 * TCP/IP or UDP/IP networking functions
4 * Copyright (C) 2006-2015, ARM Limited, All Rights Reserved
5 * SPDX-License-Identifier: Apache-2.0
7 * Licensed under the Apache License, Version 2.0 (the "License"); you may
8 * not use this file except in compliance with the License.
9 * You may obtain a copy of the License at
11 * http://www.apache.org/licenses/LICENSE-2.0
13 * Unless required by applicable law or agreed to in writing, software
14 * distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
15 * WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
16 * See the License for the specific language governing permissions and
17 * limitations under the License.
19 * This file is part of mbed TLS (https://tls.mbed.org)
22 #if !defined(MBEDTLS_CONFIG_FILE)
23 #include "mbedtls/config.h"
25 #include MBEDTLS_CONFIG_FILE
28 #if defined(MBEDTLS_NET_C)
30 #if !defined(unix) && !defined(__unix__) && !defined(__unix) && \
31 !defined(__APPLE__) && !defined(_WIN32)
32 #error "This module only works on Unix and Windows, see MBEDTLS_NET_C in config.h"
35 #if defined(MBEDTLS_PLATFORM_C)
36 #include "mbedtls/platform.h"
39 #define mbedtls_time_t time_t
42 #include "mbedtls/net.h"
46 #if (defined(_WIN32) || defined(_WIN32_WCE)) && !defined(EFIX64) && \
52 /* Enables getaddrinfo() & Co */
53 #define _WIN32_WINNT 0x0501
60 #if defined(_WIN32_WCE)
61 #pragma comment( lib, "ws2.lib" )
63 #pragma comment( lib, "ws2_32.lib" )
67 #define read(fd,buf,len) recv(fd,(char*)buf,(int) len,0)
68 #define write(fd,buf,len) send(fd,(char*)buf,(int) len,0)
69 #define close(fd) closesocket(fd)
71 static int wsa_init_done = 0;
73 #else /* ( _WIN32 || _WIN32_WCE ) && !EFIX64 && !EFI32 */
75 #include <sys/types.h>
76 #include <sys/socket.h>
77 #include <netinet/in.h>
78 #include <arpa/inet.h>
86 #endif /* ( _WIN32 || _WIN32_WCE ) && !EFIX64 && !EFI32 */
88 /* Some MS functions want int and MSVC warns if we pass size_t,
89 * but the standard fucntions use socklen_t, so cast only for MSVC */
91 #define MSVC_INT_CAST (int)
103 * Prepare for using the sockets interface
105 static int net_prepare( void )
107 #if ( defined(_WIN32) || defined(_WIN32_WCE) ) && !defined(EFIX64) && \
111 if( wsa_init_done == 0 )
113 if( WSAStartup( MAKEWORD(2,0), &wsaData ) != 0 )
114 return( MBEDTLS_ERR_NET_SOCKET_FAILED );
119 #if !defined(EFIX64) && !defined(EFI32)
120 signal( SIGPIPE, SIG_IGN );
127 * Initialize a context
129 void mbedtls_net_init( mbedtls_net_context *ctx )
135 * Initiate a TCP connection with host:port and the given protocol
137 int mbedtls_net_connect( mbedtls_net_context *ctx, const char *host, const char *port, int proto )
140 struct addrinfo hints, *addr_list, *cur;
142 if( ( ret = net_prepare() ) != 0 )
145 /* Do name resolution with both IPv6 and IPv4 */
146 memset( &hints, 0, sizeof( hints ) );
147 hints.ai_family = AF_UNSPEC;
148 hints.ai_socktype = proto == MBEDTLS_NET_PROTO_UDP ? SOCK_DGRAM : SOCK_STREAM;
149 hints.ai_protocol = proto == MBEDTLS_NET_PROTO_UDP ? IPPROTO_UDP : IPPROTO_TCP;
151 if( getaddrinfo( host, port, &hints, &addr_list ) != 0 )
152 return( MBEDTLS_ERR_NET_UNKNOWN_HOST );
154 /* Try the sockaddrs until a connection succeeds */
155 ret = MBEDTLS_ERR_NET_UNKNOWN_HOST;
156 for( cur = addr_list; cur != NULL; cur = cur->ai_next )
158 ctx->fd = (int) socket( cur->ai_family, cur->ai_socktype,
162 ret = MBEDTLS_ERR_NET_SOCKET_FAILED;
166 if( connect( ctx->fd, cur->ai_addr, MSVC_INT_CAST cur->ai_addrlen ) == 0 )
173 ret = MBEDTLS_ERR_NET_CONNECT_FAILED;
176 freeaddrinfo( addr_list );
182 * Create a listening socket on bind_ip:port
184 int mbedtls_net_bind( mbedtls_net_context *ctx, const char *bind_ip, const char *port, int proto )
187 struct addrinfo hints, *addr_list, *cur;
189 if( ( ret = net_prepare() ) != 0 )
192 /* Bind to IPv6 and/or IPv4, but only in the desired protocol */
193 memset( &hints, 0, sizeof( hints ) );
194 hints.ai_family = AF_UNSPEC;
195 hints.ai_socktype = proto == MBEDTLS_NET_PROTO_UDP ? SOCK_DGRAM : SOCK_STREAM;
196 hints.ai_protocol = proto == MBEDTLS_NET_PROTO_UDP ? IPPROTO_UDP : IPPROTO_TCP;
197 if( bind_ip == NULL )
198 hints.ai_flags = AI_PASSIVE;
200 if( getaddrinfo( bind_ip, port, &hints, &addr_list ) != 0 )
201 return( MBEDTLS_ERR_NET_UNKNOWN_HOST );
203 /* Try the sockaddrs until a binding succeeds */
204 ret = MBEDTLS_ERR_NET_UNKNOWN_HOST;
205 for( cur = addr_list; cur != NULL; cur = cur->ai_next )
207 ctx->fd = (int) socket( cur->ai_family, cur->ai_socktype,
211 ret = MBEDTLS_ERR_NET_SOCKET_FAILED;
216 if( setsockopt( ctx->fd, SOL_SOCKET, SO_REUSEADDR,
217 (const char *) &n, sizeof( n ) ) != 0 )
220 ret = MBEDTLS_ERR_NET_SOCKET_FAILED;
224 if( bind( ctx->fd, cur->ai_addr, MSVC_INT_CAST cur->ai_addrlen ) != 0 )
227 ret = MBEDTLS_ERR_NET_BIND_FAILED;
231 /* Listen only makes sense for TCP */
232 if( proto == MBEDTLS_NET_PROTO_TCP )
234 if( listen( ctx->fd, MBEDTLS_NET_LISTEN_BACKLOG ) != 0 )
237 ret = MBEDTLS_ERR_NET_LISTEN_FAILED;
242 /* I we ever get there, it's a success */
247 freeaddrinfo( addr_list );
253 #if ( defined(_WIN32) || defined(_WIN32_WCE) ) && !defined(EFIX64) && \
256 * Check if the requested operation would be blocking on a non-blocking socket
257 * and thus 'failed' with a negative return value.
259 static int net_would_block( const mbedtls_net_context *ctx )
262 return( WSAGetLastError() == WSAEWOULDBLOCK );
266 * Check if the requested operation would be blocking on a non-blocking socket
267 * and thus 'failed' with a negative return value.
269 * Note: on a blocking socket this function always returns 0!
271 static int net_would_block( const mbedtls_net_context *ctx )
274 * Never return 'WOULD BLOCK' on a non-blocking socket
276 if( ( fcntl( ctx->fd, F_GETFL ) & O_NONBLOCK ) != O_NONBLOCK )
284 #if defined EWOULDBLOCK && EWOULDBLOCK != EAGAIN
291 #endif /* ( _WIN32 || _WIN32_WCE ) && !EFIX64 && !EFI32 */
294 * Accept a connection from a remote client
296 int mbedtls_net_accept( mbedtls_net_context *bind_ctx,
297 mbedtls_net_context *client_ctx,
298 void *client_ip, size_t buf_size, size_t *ip_len )
303 struct sockaddr_storage client_addr;
305 #if defined(__socklen_t_defined) || defined(_SOCKLEN_T) || \
306 defined(_SOCKLEN_T_DECLARED) || defined(__DEFINED_socklen_t)
307 socklen_t n = (socklen_t) sizeof( client_addr );
308 socklen_t type_len = (socklen_t) sizeof( type );
310 int n = (int) sizeof( client_addr );
311 int type_len = (int) sizeof( type );
314 /* Is this a TCP or UDP socket? */
315 if( getsockopt( bind_ctx->fd, SOL_SOCKET, SO_TYPE,
316 (void *) &type, &type_len ) != 0 ||
317 ( type != SOCK_STREAM && type != SOCK_DGRAM ) )
319 return( MBEDTLS_ERR_NET_ACCEPT_FAILED );
322 if( type == SOCK_STREAM )
324 /* TCP: actual accept() */
325 ret = client_ctx->fd = (int) accept( bind_ctx->fd,
326 (struct sockaddr *) &client_addr, &n );
330 /* UDP: wait for a message, but keep it in the queue */
333 ret = (int) recvfrom( bind_ctx->fd, buf, sizeof( buf ), MSG_PEEK,
334 (struct sockaddr *) &client_addr, &n );
337 if( ret == SOCKET_ERROR &&
338 WSAGetLastError() == WSAEMSGSIZE )
340 /* We know buf is too small, thanks, just peeking here */
348 if( net_would_block( bind_ctx ) != 0 )
349 return( MBEDTLS_ERR_SSL_WANT_READ );
351 return( MBEDTLS_ERR_NET_ACCEPT_FAILED );
354 /* UDP: hijack the listening socket to communicate with the client,
355 * then bind a new socket to accept new connections */
356 if( type != SOCK_STREAM )
358 struct sockaddr_storage local_addr;
361 if( connect( bind_ctx->fd, (struct sockaddr *) &client_addr, n ) != 0 )
362 return( MBEDTLS_ERR_NET_ACCEPT_FAILED );
364 client_ctx->fd = bind_ctx->fd;
365 bind_ctx->fd = -1; /* In case we exit early */
367 n = sizeof( struct sockaddr_storage );
368 if( getsockname( client_ctx->fd,
369 (struct sockaddr *) &local_addr, &n ) != 0 ||
370 ( bind_ctx->fd = (int) socket( local_addr.ss_family,
371 SOCK_DGRAM, IPPROTO_UDP ) ) < 0 ||
372 setsockopt( bind_ctx->fd, SOL_SOCKET, SO_REUSEADDR,
373 (const char *) &one, sizeof( one ) ) != 0 )
375 return( MBEDTLS_ERR_NET_SOCKET_FAILED );
378 if( bind( bind_ctx->fd, (struct sockaddr *) &local_addr, n ) != 0 )
380 return( MBEDTLS_ERR_NET_BIND_FAILED );
384 if( client_ip != NULL )
386 if( client_addr.ss_family == AF_INET )
388 struct sockaddr_in *addr4 = (struct sockaddr_in *) &client_addr;
389 *ip_len = sizeof( addr4->sin_addr.s_addr );
391 if( buf_size < *ip_len )
392 return( MBEDTLS_ERR_NET_BUFFER_TOO_SMALL );
394 memcpy( client_ip, &addr4->sin_addr.s_addr, *ip_len );
398 struct sockaddr_in6 *addr6 = (struct sockaddr_in6 *) &client_addr;
399 *ip_len = sizeof( addr6->sin6_addr.s6_addr );
401 if( buf_size < *ip_len )
402 return( MBEDTLS_ERR_NET_BUFFER_TOO_SMALL );
404 memcpy( client_ip, &addr6->sin6_addr.s6_addr, *ip_len);
412 * Set the socket blocking or non-blocking
414 int mbedtls_net_set_block( mbedtls_net_context *ctx )
416 #if ( defined(_WIN32) || defined(_WIN32_WCE) ) && !defined(EFIX64) && \
419 return( ioctlsocket( ctx->fd, FIONBIO, &n ) );
421 return( fcntl( ctx->fd, F_SETFL, fcntl( ctx->fd, F_GETFL ) & ~O_NONBLOCK ) );
425 int mbedtls_net_set_nonblock( mbedtls_net_context *ctx )
427 #if ( defined(_WIN32) || defined(_WIN32_WCE) ) && !defined(EFIX64) && \
430 return( ioctlsocket( ctx->fd, FIONBIO, &n ) );
432 return( fcntl( ctx->fd, F_SETFL, fcntl( ctx->fd, F_GETFL ) | O_NONBLOCK ) );
437 * Portable usleep helper
439 void mbedtls_net_usleep( unsigned long usec )
442 Sleep( ( usec + 999 ) / 1000 );
445 tv.tv_sec = usec / 1000000;
446 #if defined(__unix__) || defined(__unix) || \
447 ( defined(__APPLE__) && defined(__MACH__) )
448 tv.tv_usec = (suseconds_t) usec % 1000000;
450 tv.tv_usec = usec % 1000000;
452 select( 0, NULL, NULL, NULL, &tv );
457 * Read at most 'len' characters
459 int mbedtls_net_recv( void *ctx, unsigned char *buf, size_t len )
462 int fd = ((mbedtls_net_context *) ctx)->fd;
465 return( MBEDTLS_ERR_NET_INVALID_CONTEXT );
467 ret = (int) read( fd, buf, len );
471 if( net_would_block( ctx ) != 0 )
472 return( MBEDTLS_ERR_SSL_WANT_READ );
474 #if ( defined(_WIN32) || defined(_WIN32_WCE) ) && !defined(EFIX64) && \
476 if( WSAGetLastError() == WSAECONNRESET )
477 return( MBEDTLS_ERR_NET_CONN_RESET );
479 if( errno == EPIPE || errno == ECONNRESET )
480 return( MBEDTLS_ERR_NET_CONN_RESET );
483 return( MBEDTLS_ERR_SSL_WANT_READ );
486 return( MBEDTLS_ERR_NET_RECV_FAILED );
493 * Read at most 'len' characters, blocking for at most 'timeout' ms
495 int mbedtls_net_recv_timeout( void *ctx, unsigned char *buf, size_t len,
501 int fd = ((mbedtls_net_context *) ctx)->fd;
504 return( MBEDTLS_ERR_NET_INVALID_CONTEXT );
506 FD_ZERO( &read_fds );
507 FD_SET( fd, &read_fds );
509 tv.tv_sec = timeout / 1000;
510 tv.tv_usec = ( timeout % 1000 ) * 1000;
512 ret = select( fd + 1, &read_fds, NULL, NULL, timeout == 0 ? NULL : &tv );
514 /* Zero fds ready means we timed out */
516 return( MBEDTLS_ERR_SSL_TIMEOUT );
520 #if ( defined(_WIN32) || defined(_WIN32_WCE) ) && !defined(EFIX64) && \
522 if( WSAGetLastError() == WSAEINTR )
523 return( MBEDTLS_ERR_SSL_WANT_READ );
526 return( MBEDTLS_ERR_SSL_WANT_READ );
529 return( MBEDTLS_ERR_NET_RECV_FAILED );
532 /* This call will not block */
533 return( mbedtls_net_recv( ctx, buf, len ) );
537 * Write at most 'len' characters
539 int mbedtls_net_send( void *ctx, const unsigned char *buf, size_t len )
542 int fd = ((mbedtls_net_context *) ctx)->fd;
545 return( MBEDTLS_ERR_NET_INVALID_CONTEXT );
547 ret = (int) write( fd, buf, len );
551 if( net_would_block( ctx ) != 0 )
552 return( MBEDTLS_ERR_SSL_WANT_WRITE );
554 #if ( defined(_WIN32) || defined(_WIN32_WCE) ) && !defined(EFIX64) && \
556 if( WSAGetLastError() == WSAECONNRESET )
557 return( MBEDTLS_ERR_NET_CONN_RESET );
559 if( errno == EPIPE || errno == ECONNRESET )
560 return( MBEDTLS_ERR_NET_CONN_RESET );
563 return( MBEDTLS_ERR_SSL_WANT_WRITE );
566 return( MBEDTLS_ERR_NET_SEND_FAILED );
573 * Gracefully close the connection
575 void mbedtls_net_free( mbedtls_net_context *ctx )
580 shutdown( ctx->fd, 2 );
586 #endif /* MBEDTLS_NET_C */