1 /* 2 * TCP/IP or UDP/IP networking functions 3 * 4 * Copyright (C) 2006-2015, ARM Limited, All Rights Reserved 5 * SPDX-License-Identifier: Apache-2.0 6 * 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 10 * 11 * http://www.apache.org/licenses/LICENSE-2.0 12 * 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. 18 * 19 * This file is part of mbed TLS (https://tls.mbed.org) 20 */ 21 22 #if !defined(MBEDTLS_CONFIG_FILE) 23 #include "mbedtls/config.h" 24 #else 25 #include MBEDTLS_CONFIG_FILE 26 #endif 27 28 #if defined(MBEDTLS_NET_C) 29 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" 33 #endif 34 35 #if defined(MBEDTLS_PLATFORM_C) 36 #include "mbedtls/platform.h" 37 #else 38 #include <stdlib.h> 39 #endif 40 41 #include "mbedtls/net_sockets.h" 42 43 #include <string.h> 44 45 #if (defined(_WIN32) || defined(_WIN32_WCE)) && !defined(EFIX64) && \ 46 !defined(EFI32) 47 48 #ifdef _WIN32_WINNT 49 #undef _WIN32_WINNT 50 #endif 51 /* Enables getaddrinfo() & Co */ 52 #define _WIN32_WINNT 0x0501 53 #include <ws2tcpip.h> 54 55 #include <winsock2.h> 56 #include <windows.h> 57 58 #if defined(_MSC_VER) 59 #if defined(_WIN32_WCE) 60 #pragma comment( lib, "ws2.lib" ) 61 #else 62 #pragma comment( lib, "ws2_32.lib" ) 63 #endif 64 #endif /* _MSC_VER */ 65 66 #define read(fd,buf,len) recv(fd,(char*)buf,(int) len,0) 67 #define write(fd,buf,len) send(fd,(char*)buf,(int) len,0) 68 #define close(fd) closesocket(fd) 69 70 static int wsa_init_done = 0; 71 72 #else /* ( _WIN32 || _WIN32_WCE ) && !EFIX64 && !EFI32 */ 73 74 #include <sys/types.h> 75 #include <sys/socket.h> 76 #include <netinet/in.h> 77 #include <arpa/inet.h> 78 #include <sys/time.h> 79 #include <unistd.h> 80 #include <signal.h> 81 #include <fcntl.h> 82 #include <netdb.h> 83 #include <errno.h> 84 85 #endif /* ( _WIN32 || _WIN32_WCE ) && !EFIX64 && !EFI32 */ 86 87 /* Some MS functions want int and MSVC warns if we pass size_t, 88 * but the standard fucntions use socklen_t, so cast only for MSVC */ 89 #if defined(_MSC_VER) 90 #define MSVC_INT_CAST (int) 91 #else 92 #define MSVC_INT_CAST 93 #endif 94 95 #include <stdio.h> 96 97 #include <time.h> 98 99 #include <stdint.h> 100 101 /* 102 * Prepare for using the sockets interface 103 */ 104 static int net_prepare( void ) 105 { 106 #if ( defined(_WIN32) || defined(_WIN32_WCE) ) && !defined(EFIX64) && \ 107 !defined(EFI32) 108 WSADATA wsaData; 109 110 if( wsa_init_done == 0 ) 111 { 112 if( WSAStartup( MAKEWORD(2,0), &wsaData ) != 0 ) 113 return( MBEDTLS_ERR_NET_SOCKET_FAILED ); 114 115 wsa_init_done = 1; 116 } 117 #else 118 #if !defined(EFIX64) && !defined(EFI32) 119 signal( SIGPIPE, SIG_IGN ); 120 #endif 121 #endif 122 return( 0 ); 123 } 124 125 /* 126 * Initialize a context 127 */ 128 void mbedtls_net_init( mbedtls_net_context *ctx ) 129 { 130 ctx->fd = -1; 131 } 132 133 /* 134 * Initiate a TCP connection with host:port and the given protocol 135 */ 136 int mbedtls_net_connect( mbedtls_net_context *ctx, const char *host, 137 const char *port, int proto ) 138 { 139 int ret; 140 struct addrinfo hints, *addr_list, *cur; 141 142 if( ( ret = net_prepare() ) != 0 ) 143 return( ret ); 144 145 /* 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; 150 151 if( getaddrinfo( host, port, &hints, &addr_list ) != 0 ) 152 return( MBEDTLS_ERR_NET_UNKNOWN_HOST ); 153 154 /* 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 ) 157 { 158 ctx->fd = (int) socket( cur->ai_family, cur->ai_socktype, 159 cur->ai_protocol ); 160 if( ctx->fd < 0 ) 161 { 162 ret = MBEDTLS_ERR_NET_SOCKET_FAILED; 163 continue; 164 } 165 166 if( connect( ctx->fd, cur->ai_addr, MSVC_INT_CAST cur->ai_addrlen ) == 0 ) 167 { 168 ret = 0; 169 break; 170 } 171 172 close( ctx->fd ); 173 ret = MBEDTLS_ERR_NET_CONNECT_FAILED; 174 } 175 176 freeaddrinfo( addr_list ); 177 178 return( ret ); 179 } 180 181 /* 182 * Create a listening socket on bind_ip:port 183 */ 184 int mbedtls_net_bind( mbedtls_net_context *ctx, const char *bind_ip, const char *port, int proto ) 185 { 186 int n, ret; 187 struct addrinfo hints, *addr_list, *cur; 188 189 if( ( ret = net_prepare() ) != 0 ) 190 return( ret ); 191 192 /* 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; 199 200 if( getaddrinfo( bind_ip, port, &hints, &addr_list ) != 0 ) 201 return( MBEDTLS_ERR_NET_UNKNOWN_HOST ); 202 203 /* 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 ) 206 { 207 ctx->fd = (int) socket( cur->ai_family, cur->ai_socktype, 208 cur->ai_protocol ); 209 if( ctx->fd < 0 ) 210 { 211 ret = MBEDTLS_ERR_NET_SOCKET_FAILED; 212 continue; 213 } 214 215 n = 1; 216 if( setsockopt( ctx->fd, SOL_SOCKET, SO_REUSEADDR, 217 (const char *) &n, sizeof( n ) ) != 0 ) 218 { 219 close( ctx->fd ); 220 ret = MBEDTLS_ERR_NET_SOCKET_FAILED; 221 continue; 222 } 223 224 if( bind( ctx->fd, cur->ai_addr, MSVC_INT_CAST cur->ai_addrlen ) != 0 ) 225 { 226 close( ctx->fd ); 227 ret = MBEDTLS_ERR_NET_BIND_FAILED; 228 continue; 229 } 230 231 /* Listen only makes sense for TCP */ 232 if( proto == MBEDTLS_NET_PROTO_TCP ) 233 { 234 if( listen( ctx->fd, MBEDTLS_NET_LISTEN_BACKLOG ) != 0 ) 235 { 236 close( ctx->fd ); 237 ret = MBEDTLS_ERR_NET_LISTEN_FAILED; 238 continue; 239 } 240 } 241 242 /* Bind was successful */ 243 ret = 0; 244 break; 245 } 246 247 freeaddrinfo( addr_list ); 248 249 return( ret ); 250 251 } 252 253 #if ( defined(_WIN32) || defined(_WIN32_WCE) ) && !defined(EFIX64) && \ 254 !defined(EFI32) 255 /* 256 * Check if the requested operation would be blocking on a non-blocking socket 257 * and thus 'failed' with a negative return value. 258 */ 259 static int net_would_block( const mbedtls_net_context *ctx ) 260 { 261 ((void) ctx); 262 return( WSAGetLastError() == WSAEWOULDBLOCK ); 263 } 264 #else 265 /* 266 * Check if the requested operation would be blocking on a non-blocking socket 267 * and thus 'failed' with a negative return value. 268 * 269 * Note: on a blocking socket this function always returns 0! 270 */ 271 static int net_would_block( const mbedtls_net_context *ctx ) 272 { 273 /* 274 * Never return 'WOULD BLOCK' on a non-blocking socket 275 */ 276 if( ( fcntl( ctx->fd, F_GETFL ) & O_NONBLOCK ) != O_NONBLOCK ) 277 return( 0 ); 278 279 switch( errno ) 280 { 281 #if defined EAGAIN 282 case EAGAIN: 283 #endif 284 #if defined EWOULDBLOCK && EWOULDBLOCK != EAGAIN 285 case EWOULDBLOCK: 286 #endif 287 return( 1 ); 288 } 289 return( 0 ); 290 } 291 #endif /* ( _WIN32 || _WIN32_WCE ) && !EFIX64 && !EFI32 */ 292 293 /* 294 * Accept a connection from a remote client 295 */ 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 ) 299 { 300 int ret; 301 int type; 302 303 struct sockaddr_storage client_addr; 304 305 #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 ); 309 #else 310 int n = (int) sizeof( client_addr ); 311 int type_len = (int) sizeof( type ); 312 #endif 313 314 /* 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 ) ) 318 { 319 return( MBEDTLS_ERR_NET_ACCEPT_FAILED ); 320 } 321 322 if( type == SOCK_STREAM ) 323 { 324 /* TCP: actual accept() */ 325 ret = client_ctx->fd = (int) accept( bind_ctx->fd, 326 (struct sockaddr *) &client_addr, &n ); 327 } 328 else 329 { 330 /* UDP: wait for a message, but keep it in the queue */ 331 char buf[1] = { 0 }; 332 333 ret = (int) recvfrom( bind_ctx->fd, buf, sizeof( buf ), MSG_PEEK, 334 (struct sockaddr *) &client_addr, &n ); 335 336 #if defined(_WIN32) 337 if( ret == SOCKET_ERROR && 338 WSAGetLastError() == WSAEMSGSIZE ) 339 { 340 /* We know buf is too small, thanks, just peeking here */ 341 ret = 0; 342 } 343 #endif 344 } 345 346 if( ret < 0 ) 347 { 348 if( net_would_block( bind_ctx ) != 0 ) 349 return( MBEDTLS_ERR_SSL_WANT_READ ); 350 351 return( MBEDTLS_ERR_NET_ACCEPT_FAILED ); 352 } 353 354 /* 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 ) 357 { 358 struct sockaddr_storage local_addr; 359 int one = 1; 360 361 if( connect( bind_ctx->fd, (struct sockaddr *) &client_addr, n ) != 0 ) 362 return( MBEDTLS_ERR_NET_ACCEPT_FAILED ); 363 364 client_ctx->fd = bind_ctx->fd; 365 bind_ctx->fd = -1; /* In case we exit early */ 366 367 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 ) 374 { 375 return( MBEDTLS_ERR_NET_SOCKET_FAILED ); 376 } 377 378 if( bind( bind_ctx->fd, (struct sockaddr *) &local_addr, n ) != 0 ) 379 { 380 return( MBEDTLS_ERR_NET_BIND_FAILED ); 381 } 382 } 383 384 if( client_ip != NULL ) 385 { 386 if( client_addr.ss_family == AF_INET ) 387 { 388 struct sockaddr_in *addr4 = (struct sockaddr_in *) &client_addr; 389 *ip_len = sizeof( addr4->sin_addr.s_addr ); 390 391 if( buf_size < *ip_len ) 392 return( MBEDTLS_ERR_NET_BUFFER_TOO_SMALL ); 393 394 memcpy( client_ip, &addr4->sin_addr.s_addr, *ip_len ); 395 } 396 else 397 { 398 struct sockaddr_in6 *addr6 = (struct sockaddr_in6 *) &client_addr; 399 *ip_len = sizeof( addr6->sin6_addr.s6_addr ); 400 401 if( buf_size < *ip_len ) 402 return( MBEDTLS_ERR_NET_BUFFER_TOO_SMALL ); 403 404 memcpy( client_ip, &addr6->sin6_addr.s6_addr, *ip_len); 405 } 406 } 407 408 return( 0 ); 409 } 410 411 /* 412 * Set the socket blocking or non-blocking 413 */ 414 int mbedtls_net_set_block( mbedtls_net_context *ctx ) 415 { 416 #if ( defined(_WIN32) || defined(_WIN32_WCE) ) && !defined(EFIX64) && \ 417 !defined(EFI32) 418 u_long n = 0; 419 return( ioctlsocket( ctx->fd, FIONBIO, &n ) ); 420 #else 421 return( fcntl( ctx->fd, F_SETFL, fcntl( ctx->fd, F_GETFL ) & ~O_NONBLOCK ) ); 422 #endif 423 } 424 425 int mbedtls_net_set_nonblock( mbedtls_net_context *ctx ) 426 { 427 #if ( defined(_WIN32) || defined(_WIN32_WCE) ) && !defined(EFIX64) && \ 428 !defined(EFI32) 429 u_long n = 1; 430 return( ioctlsocket( ctx->fd, FIONBIO, &n ) ); 431 #else 432 return( fcntl( ctx->fd, F_SETFL, fcntl( ctx->fd, F_GETFL ) | O_NONBLOCK ) ); 433 #endif 434 } 435 436 /* 437 * Portable usleep helper 438 */ 439 void mbedtls_net_usleep( unsigned long usec ) 440 { 441 #if defined(_WIN32) 442 Sleep( ( usec + 999 ) / 1000 ); 443 #else 444 struct timeval tv; 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; 449 #else 450 tv.tv_usec = usec % 1000000; 451 #endif 452 select( 0, NULL, NULL, NULL, &tv ); 453 #endif 454 } 455 456 /* 457 * Read at most 'len' characters 458 */ 459 int mbedtls_net_recv( void *ctx, unsigned char *buf, size_t len ) 460 { 461 int ret; 462 int fd = ((mbedtls_net_context *) ctx)->fd; 463 464 if( fd < 0 ) 465 return( MBEDTLS_ERR_NET_INVALID_CONTEXT ); 466 467 ret = (int) read( fd, buf, len ); 468 469 if( ret < 0 ) 470 { 471 if( net_would_block( ctx ) != 0 ) 472 return( MBEDTLS_ERR_SSL_WANT_READ ); 473 474 #if ( defined(_WIN32) || defined(_WIN32_WCE) ) && !defined(EFIX64) && \ 475 !defined(EFI32) 476 if( WSAGetLastError() == WSAECONNRESET ) 477 return( MBEDTLS_ERR_NET_CONN_RESET ); 478 #else 479 if( errno == EPIPE || errno == ECONNRESET ) 480 return( MBEDTLS_ERR_NET_CONN_RESET ); 481 482 if( errno == EINTR ) 483 return( MBEDTLS_ERR_SSL_WANT_READ ); 484 #endif 485 486 return( MBEDTLS_ERR_NET_RECV_FAILED ); 487 } 488 489 return( ret ); 490 } 491 492 /* 493 * Read at most 'len' characters, blocking for at most 'timeout' ms 494 */ 495 int mbedtls_net_recv_timeout( void *ctx, unsigned char *buf, size_t len, 496 uint32_t timeout ) 497 { 498 int ret; 499 struct timeval tv; 500 fd_set read_fds; 501 int fd = ((mbedtls_net_context *) ctx)->fd; 502 503 if( fd < 0 ) 504 return( MBEDTLS_ERR_NET_INVALID_CONTEXT ); 505 506 FD_ZERO( &read_fds ); 507 FD_SET( fd, &read_fds ); 508 509 tv.tv_sec = timeout / 1000; 510 tv.tv_usec = ( timeout % 1000 ) * 1000; 511 512 ret = select( fd + 1, &read_fds, NULL, NULL, timeout == 0 ? NULL : &tv ); 513 514 /* Zero fds ready means we timed out */ 515 if( ret == 0 ) 516 return( MBEDTLS_ERR_SSL_TIMEOUT ); 517 518 if( ret < 0 ) 519 { 520 #if ( defined(_WIN32) || defined(_WIN32_WCE) ) && !defined(EFIX64) && \ 521 !defined(EFI32) 522 if( WSAGetLastError() == WSAEINTR ) 523 return( MBEDTLS_ERR_SSL_WANT_READ ); 524 #else 525 if( errno == EINTR ) 526 return( MBEDTLS_ERR_SSL_WANT_READ ); 527 #endif 528 529 return( MBEDTLS_ERR_NET_RECV_FAILED ); 530 } 531 532 /* This call will not block */ 533 return( mbedtls_net_recv( ctx, buf, len ) ); 534 } 535 536 /* 537 * Write at most 'len' characters 538 */ 539 int mbedtls_net_send( void *ctx, const unsigned char *buf, size_t len ) 540 { 541 int ret; 542 int fd = ((mbedtls_net_context *) ctx)->fd; 543 544 if( fd < 0 ) 545 return( MBEDTLS_ERR_NET_INVALID_CONTEXT ); 546 547 ret = (int) write( fd, buf, len ); 548 549 if( ret < 0 ) 550 { 551 if( net_would_block( ctx ) != 0 ) 552 return( MBEDTLS_ERR_SSL_WANT_WRITE ); 553 554 #if ( defined(_WIN32) || defined(_WIN32_WCE) ) && !defined(EFIX64) && \ 555 !defined(EFI32) 556 if( WSAGetLastError() == WSAECONNRESET ) 557 return( MBEDTLS_ERR_NET_CONN_RESET ); 558 #else 559 if( errno == EPIPE || errno == ECONNRESET ) 560 return( MBEDTLS_ERR_NET_CONN_RESET ); 561 562 if( errno == EINTR ) 563 return( MBEDTLS_ERR_SSL_WANT_WRITE ); 564 #endif 565 566 return( MBEDTLS_ERR_NET_SEND_FAILED ); 567 } 568 569 return( ret ); 570 } 571 572 /* 573 * Gracefully close the connection 574 */ 575 void mbedtls_net_free( mbedtls_net_context *ctx ) 576 { 577 if( ctx->fd == -1 ) 578 return; 579 580 shutdown( ctx->fd, 2 ); 581 close( ctx->fd ); 582 583 ctx->fd = -1; 584 } 585 586 #endif /* MBEDTLS_NET_C */ 587