1 /*
2 * TCP/IP or UDP/IP networking functions
3 *
4 * Copyright The Mbed TLS Contributors
5 * SPDX-License-Identifier: Apache-2.0 OR GPL-2.0-or-later
6 */
7
8 /* Enable definition of getaddrinfo() even when compiling with -std=c99. Must
9 * be set before mbedtls_config.h, which pulls in glibc's features.h indirectly.
10 * Harmless on other platforms. */
11 #ifndef _POSIX_C_SOURCE
12 #define _POSIX_C_SOURCE 200112L
13 #endif
14 #ifndef _XOPEN_SOURCE
15 #define _XOPEN_SOURCE 600 /* sockaddr_storage */
16 #endif
17
18 #include "common.h"
19
20 #if defined(MBEDTLS_NET_C)
21
22 #if !defined(unix) && !defined(__unix__) && !defined(__unix) && \
23 !defined(__APPLE__) && !defined(_WIN32) && !defined(__QNXNTO__) && \
24 !defined(__HAIKU__) && !defined(__midipix__)
25 #error "This module only works on Unix and Windows, see MBEDTLS_NET_C in mbedtls_config.h"
26 #endif
27
28 #include "mbedtls/platform.h"
29
30 #include "mbedtls/net_sockets.h"
31 #include "mbedtls/error.h"
32
33 #include <string.h>
34
35 #if (defined(_WIN32) || defined(_WIN32_WCE)) && !defined(EFIX64) && \
36 !defined(EFI32)
37
38 #define IS_EINTR(ret) ((ret) == WSAEINTR)
39
40 #include <ws2tcpip.h>
41
42 #include <winsock2.h>
43 #include <windows.h>
44 #if (_WIN32_WINNT < 0x0501)
45 #include <wspiapi.h>
46 #endif
47
48 #if defined(_MSC_VER)
49 #if defined(_WIN32_WCE)
50 #pragma comment( lib, "ws2.lib" )
51 #else
52 #pragma comment( lib, "ws2_32.lib" )
53 #endif
54 #endif /* _MSC_VER */
55
56 #define read(fd, buf, len) recv(fd, (char *) (buf), (int) (len), 0)
57 #define write(fd, buf, len) send(fd, (char *) (buf), (int) (len), 0)
58 #define close(fd) closesocket(fd)
59
60 static int wsa_init_done = 0;
61
62 #else /* ( _WIN32 || _WIN32_WCE ) && !EFIX64 && !EFI32 */
63
64 #include <sys/types.h>
65 #include <sys/socket.h>
66 #include <netinet/in.h>
67 #include <arpa/inet.h>
68 #include <sys/time.h>
69 #include <unistd.h>
70 #include <signal.h>
71 #include <fcntl.h>
72 #include <netdb.h>
73 #include <errno.h>
74
75 #define IS_EINTR(ret) ((ret) == EINTR)
76 #define SOCKET int
77
78 #endif /* ( _WIN32 || _WIN32_WCE ) && !EFIX64 && !EFI32 */
79
80 /* Some MS functions want int and MSVC warns if we pass size_t,
81 * but the standard functions use socklen_t, so cast only for MSVC */
82 #if defined(_MSC_VER)
83 #define MSVC_INT_CAST (int)
84 #else
85 #define MSVC_INT_CAST
86 #endif
87
88 #include <stdio.h>
89
90 #if defined(MBEDTLS_HAVE_TIME)
91 #include <time.h>
92 #endif
93
94 #include <stdint.h>
95
96 /*
97 * Prepare for using the sockets interface
98 */
net_prepare(void)99 static int net_prepare(void)
100 {
101 #if (defined(_WIN32) || defined(_WIN32_WCE)) && !defined(EFIX64) && \
102 !defined(EFI32)
103 WSADATA wsaData;
104
105 if (wsa_init_done == 0) {
106 if (WSAStartup(MAKEWORD(2, 0), &wsaData) != 0) {
107 return MBEDTLS_ERR_NET_SOCKET_FAILED;
108 }
109
110 wsa_init_done = 1;
111 }
112 #else
113 #if !defined(EFIX64) && !defined(EFI32)
114 signal(SIGPIPE, SIG_IGN);
115 #endif
116 #endif
117 return 0;
118 }
119
120 /*
121 * Return 0 if the file descriptor is valid, an error otherwise.
122 * If for_select != 0, check whether the file descriptor is within the range
123 * allowed for fd_set used for the FD_xxx macros and the select() function.
124 */
check_fd(int fd,int for_select)125 static int check_fd(int fd, int for_select)
126 {
127 if (fd < 0) {
128 return MBEDTLS_ERR_NET_INVALID_CONTEXT;
129 }
130
131 #if (defined(_WIN32) || defined(_WIN32_WCE)) && !defined(EFIX64) && \
132 !defined(EFI32)
133 (void) for_select;
134 #else
135 /* A limitation of select() is that it only works with file descriptors
136 * that are strictly less than FD_SETSIZE. This is a limitation of the
137 * fd_set type. Error out early, because attempting to call FD_SET on a
138 * large file descriptor is a buffer overflow on typical platforms. */
139 if (for_select && fd >= FD_SETSIZE) {
140 return MBEDTLS_ERR_NET_POLL_FAILED;
141 }
142 #endif
143
144 return 0;
145 }
146
147 /*
148 * Initialize a context
149 */
mbedtls_net_init(mbedtls_net_context * ctx)150 void mbedtls_net_init(mbedtls_net_context *ctx)
151 {
152 ctx->fd = -1;
153 }
154
155 /*
156 * Initiate a TCP connection with host:port and the given protocol
157 */
mbedtls_net_connect(mbedtls_net_context * ctx,const char * host,const char * port,int proto)158 int mbedtls_net_connect(mbedtls_net_context *ctx, const char *host,
159 const char *port, int proto)
160 {
161 int ret = MBEDTLS_ERR_ERROR_CORRUPTION_DETECTED;
162 struct addrinfo hints, *addr_list, *cur;
163
164 if ((ret = net_prepare()) != 0) {
165 return ret;
166 }
167
168 /* Do name resolution with both IPv6 and IPv4 */
169 memset(&hints, 0, sizeof(hints));
170 hints.ai_family = AF_UNSPEC;
171 hints.ai_socktype = proto == MBEDTLS_NET_PROTO_UDP ? SOCK_DGRAM : SOCK_STREAM;
172 hints.ai_protocol = proto == MBEDTLS_NET_PROTO_UDP ? IPPROTO_UDP : IPPROTO_TCP;
173
174 if (getaddrinfo(host, port, &hints, &addr_list) != 0) {
175 return MBEDTLS_ERR_NET_UNKNOWN_HOST;
176 }
177
178 /* Try the sockaddrs until a connection succeeds */
179 ret = MBEDTLS_ERR_NET_UNKNOWN_HOST;
180 for (cur = addr_list; cur != NULL; cur = cur->ai_next) {
181 ctx->fd = (int) socket(cur->ai_family, cur->ai_socktype,
182 cur->ai_protocol);
183 if (ctx->fd < 0) {
184 ret = MBEDTLS_ERR_NET_SOCKET_FAILED;
185 continue;
186 }
187
188 if (connect(ctx->fd, cur->ai_addr, MSVC_INT_CAST cur->ai_addrlen) == 0) {
189 ret = 0;
190 break;
191 }
192
193 close(ctx->fd);
194 ret = MBEDTLS_ERR_NET_CONNECT_FAILED;
195 }
196
197 freeaddrinfo(addr_list);
198
199 return ret;
200 }
201
202 /*
203 * Create a listening socket on bind_ip:port
204 */
mbedtls_net_bind(mbedtls_net_context * ctx,const char * bind_ip,const char * port,int proto)205 int mbedtls_net_bind(mbedtls_net_context *ctx, const char *bind_ip, const char *port, int proto)
206 {
207 int n, ret;
208 struct addrinfo hints, *addr_list, *cur;
209
210 if ((ret = net_prepare()) != 0) {
211 return ret;
212 }
213
214 /* Bind to IPv6 and/or IPv4, but only in the desired protocol */
215 memset(&hints, 0, sizeof(hints));
216 hints.ai_family = AF_UNSPEC;
217 hints.ai_socktype = proto == MBEDTLS_NET_PROTO_UDP ? SOCK_DGRAM : SOCK_STREAM;
218 hints.ai_protocol = proto == MBEDTLS_NET_PROTO_UDP ? IPPROTO_UDP : IPPROTO_TCP;
219 if (bind_ip == NULL) {
220 hints.ai_flags = AI_PASSIVE;
221 }
222
223 if (getaddrinfo(bind_ip, port, &hints, &addr_list) != 0) {
224 return MBEDTLS_ERR_NET_UNKNOWN_HOST;
225 }
226
227 /* Try the sockaddrs until a binding succeeds */
228 ret = MBEDTLS_ERR_NET_UNKNOWN_HOST;
229 for (cur = addr_list; cur != NULL; cur = cur->ai_next) {
230 ctx->fd = (int) socket(cur->ai_family, cur->ai_socktype,
231 cur->ai_protocol);
232 if (ctx->fd < 0) {
233 ret = MBEDTLS_ERR_NET_SOCKET_FAILED;
234 continue;
235 }
236
237 n = 1;
238 if (setsockopt(ctx->fd, SOL_SOCKET, SO_REUSEADDR,
239 (const char *) &n, sizeof(n)) != 0) {
240 close(ctx->fd);
241 ret = MBEDTLS_ERR_NET_SOCKET_FAILED;
242 continue;
243 }
244
245 if (bind(ctx->fd, cur->ai_addr, MSVC_INT_CAST cur->ai_addrlen) != 0) {
246 close(ctx->fd);
247 ret = MBEDTLS_ERR_NET_BIND_FAILED;
248 continue;
249 }
250
251 /* Listen only makes sense for TCP */
252 if (proto == MBEDTLS_NET_PROTO_TCP) {
253 if (listen(ctx->fd, MBEDTLS_NET_LISTEN_BACKLOG) != 0) {
254 close(ctx->fd);
255 ret = MBEDTLS_ERR_NET_LISTEN_FAILED;
256 continue;
257 }
258 }
259
260 /* Bind was successful */
261 ret = 0;
262 break;
263 }
264
265 freeaddrinfo(addr_list);
266
267 return ret;
268
269 }
270
271 #if (defined(_WIN32) || defined(_WIN32_WCE)) && !defined(EFIX64) && \
272 !defined(EFI32)
273 /*
274 * Check if the requested operation would be blocking on a non-blocking socket
275 * and thus 'failed' with a negative return value.
276 */
net_would_block(const mbedtls_net_context * ctx)277 static int net_would_block(const mbedtls_net_context *ctx)
278 {
279 ((void) ctx);
280 return WSAGetLastError() == WSAEWOULDBLOCK;
281 }
282 #else
283 /*
284 * Check if the requested operation would be blocking on a non-blocking socket
285 * and thus 'failed' with a negative return value.
286 *
287 * Note: on a blocking socket this function always returns 0!
288 */
net_would_block(const mbedtls_net_context * ctx)289 static int net_would_block(const mbedtls_net_context *ctx)
290 {
291 int err = errno;
292
293 /*
294 * Never return 'WOULD BLOCK' on a blocking socket
295 */
296 if ((fcntl(ctx->fd, F_GETFL) & O_NONBLOCK) != O_NONBLOCK) {
297 errno = err;
298 return 0;
299 }
300
301 switch (errno = err) {
302 #if defined EAGAIN
303 case EAGAIN:
304 #endif
305 #if defined EWOULDBLOCK && EWOULDBLOCK != EAGAIN
306 case EWOULDBLOCK:
307 #endif
308 return 1;
309 }
310 return 0;
311 }
312 #endif /* ( _WIN32 || _WIN32_WCE ) && !EFIX64 && !EFI32 */
313
314 /*
315 * Accept a connection from a remote client
316 */
mbedtls_net_accept(mbedtls_net_context * bind_ctx,mbedtls_net_context * client_ctx,void * client_ip,size_t buf_size,size_t * cip_len)317 int mbedtls_net_accept(mbedtls_net_context *bind_ctx,
318 mbedtls_net_context *client_ctx,
319 void *client_ip, size_t buf_size, size_t *cip_len)
320 {
321 int ret = MBEDTLS_ERR_ERROR_CORRUPTION_DETECTED;
322 int type;
323
324 struct sockaddr_storage client_addr;
325
326 #if defined(__socklen_t_defined) || defined(_SOCKLEN_T) || \
327 defined(_SOCKLEN_T_DECLARED) || defined(__DEFINED_socklen_t) || \
328 defined(socklen_t) || (defined(_POSIX_VERSION) && _POSIX_VERSION >= 200112L)
329 socklen_t n = (socklen_t) sizeof(client_addr);
330 socklen_t type_len = (socklen_t) sizeof(type);
331 #else
332 int n = (int) sizeof(client_addr);
333 int type_len = (int) sizeof(type);
334 #endif
335
336 /* Is this a TCP or UDP socket? */
337 if (getsockopt(bind_ctx->fd, SOL_SOCKET, SO_TYPE,
338 (void *) &type, &type_len) != 0 ||
339 (type != SOCK_STREAM && type != SOCK_DGRAM)) {
340 return MBEDTLS_ERR_NET_ACCEPT_FAILED;
341 }
342
343 if (type == SOCK_STREAM) {
344 /* TCP: actual accept() */
345 ret = client_ctx->fd = (int) accept(bind_ctx->fd,
346 (struct sockaddr *) &client_addr, &n);
347 } else {
348 /* UDP: wait for a message, but keep it in the queue */
349 char buf[1] = { 0 };
350
351 ret = (int) recvfrom(bind_ctx->fd, buf, sizeof(buf), MSG_PEEK,
352 (struct sockaddr *) &client_addr, &n);
353
354 #if defined(_WIN32)
355 if (ret == SOCKET_ERROR &&
356 WSAGetLastError() == WSAEMSGSIZE) {
357 /* We know buf is too small, thanks, just peeking here */
358 ret = 0;
359 }
360 #endif
361 }
362
363 if (ret < 0) {
364 if (net_would_block(bind_ctx) != 0) {
365 return MBEDTLS_ERR_SSL_WANT_READ;
366 }
367
368 return MBEDTLS_ERR_NET_ACCEPT_FAILED;
369 }
370
371 /* UDP: hijack the listening socket to communicate with the client,
372 * then bind a new socket to accept new connections */
373 if (type != SOCK_STREAM) {
374 struct sockaddr_storage local_addr;
375 int one = 1;
376
377 if (connect(bind_ctx->fd, (struct sockaddr *) &client_addr, n) != 0) {
378 return MBEDTLS_ERR_NET_ACCEPT_FAILED;
379 }
380
381 client_ctx->fd = bind_ctx->fd;
382 bind_ctx->fd = -1; /* In case we exit early */
383
384 n = sizeof(struct sockaddr_storage);
385 if (getsockname(client_ctx->fd,
386 (struct sockaddr *) &local_addr, &n) != 0 ||
387 (bind_ctx->fd = (int) socket(local_addr.ss_family,
388 SOCK_DGRAM, IPPROTO_UDP)) < 0 ||
389 setsockopt(bind_ctx->fd, SOL_SOCKET, SO_REUSEADDR,
390 (const char *) &one, sizeof(one)) != 0) {
391 return MBEDTLS_ERR_NET_SOCKET_FAILED;
392 }
393
394 if (bind(bind_ctx->fd, (struct sockaddr *) &local_addr, n) != 0) {
395 return MBEDTLS_ERR_NET_BIND_FAILED;
396 }
397 }
398
399 if (client_ip != NULL) {
400 if (client_addr.ss_family == AF_INET) {
401 struct sockaddr_in *addr4 = (struct sockaddr_in *) &client_addr;
402 *cip_len = sizeof(addr4->sin_addr.s_addr);
403
404 if (buf_size < *cip_len) {
405 return MBEDTLS_ERR_NET_BUFFER_TOO_SMALL;
406 }
407
408 memcpy(client_ip, &addr4->sin_addr.s_addr, *cip_len);
409 } else {
410 struct sockaddr_in6 *addr6 = (struct sockaddr_in6 *) &client_addr;
411 *cip_len = sizeof(addr6->sin6_addr.s6_addr);
412
413 if (buf_size < *cip_len) {
414 return MBEDTLS_ERR_NET_BUFFER_TOO_SMALL;
415 }
416
417 memcpy(client_ip, &addr6->sin6_addr.s6_addr, *cip_len);
418 }
419 }
420
421 return 0;
422 }
423
424 /*
425 * Set the socket blocking or non-blocking
426 */
mbedtls_net_set_block(mbedtls_net_context * ctx)427 int mbedtls_net_set_block(mbedtls_net_context *ctx)
428 {
429 #if (defined(_WIN32) || defined(_WIN32_WCE)) && !defined(EFIX64) && \
430 !defined(EFI32)
431 u_long n = 0;
432 return ioctlsocket(ctx->fd, FIONBIO, &n);
433 #else
434 return fcntl(ctx->fd, F_SETFL, fcntl(ctx->fd, F_GETFL) & ~O_NONBLOCK);
435 #endif
436 }
437
mbedtls_net_set_nonblock(mbedtls_net_context * ctx)438 int mbedtls_net_set_nonblock(mbedtls_net_context *ctx)
439 {
440 #if (defined(_WIN32) || defined(_WIN32_WCE)) && !defined(EFIX64) && \
441 !defined(EFI32)
442 u_long n = 1;
443 return ioctlsocket(ctx->fd, FIONBIO, &n);
444 #else
445 return fcntl(ctx->fd, F_SETFL, fcntl(ctx->fd, F_GETFL) | O_NONBLOCK);
446 #endif
447 }
448
449 /*
450 * Check if data is available on the socket
451 */
452
mbedtls_net_poll(mbedtls_net_context * ctx,uint32_t rw,uint32_t timeout)453 int mbedtls_net_poll(mbedtls_net_context *ctx, uint32_t rw, uint32_t timeout)
454 {
455 int ret = MBEDTLS_ERR_ERROR_CORRUPTION_DETECTED;
456 struct timeval tv;
457
458 fd_set read_fds;
459 fd_set write_fds;
460
461 int fd = ctx->fd;
462
463 ret = check_fd(fd, 1);
464 if (ret != 0) {
465 return ret;
466 }
467
468 #if defined(__has_feature)
469 #if __has_feature(memory_sanitizer)
470 /* Ensure that memory sanitizers consider read_fds and write_fds as
471 * initialized even on platforms such as Glibc/x86_64 where FD_ZERO
472 * is implemented in assembly. */
473 memset(&read_fds, 0, sizeof(read_fds));
474 memset(&write_fds, 0, sizeof(write_fds));
475 #endif
476 #endif
477
478 FD_ZERO(&read_fds);
479 if (rw & MBEDTLS_NET_POLL_READ) {
480 rw &= ~MBEDTLS_NET_POLL_READ;
481 FD_SET((SOCKET) fd, &read_fds);
482 }
483
484 FD_ZERO(&write_fds);
485 if (rw & MBEDTLS_NET_POLL_WRITE) {
486 rw &= ~MBEDTLS_NET_POLL_WRITE;
487 FD_SET((SOCKET) fd, &write_fds);
488 }
489
490 if (rw != 0) {
491 return MBEDTLS_ERR_NET_BAD_INPUT_DATA;
492 }
493
494 tv.tv_sec = timeout / 1000;
495 tv.tv_usec = (timeout % 1000) * 1000;
496
497 do {
498 ret = select(fd + 1, &read_fds, &write_fds, NULL,
499 timeout == (uint32_t) -1 ? NULL : &tv);
500 } while (IS_EINTR(ret));
501
502 if (ret < 0) {
503 return MBEDTLS_ERR_NET_POLL_FAILED;
504 }
505
506 ret = 0;
507 if (FD_ISSET(fd, &read_fds)) {
508 ret |= MBEDTLS_NET_POLL_READ;
509 }
510 if (FD_ISSET(fd, &write_fds)) {
511 ret |= MBEDTLS_NET_POLL_WRITE;
512 }
513
514 return ret;
515 }
516
517 /*
518 * Portable usleep helper
519 */
mbedtls_net_usleep(unsigned long usec)520 void mbedtls_net_usleep(unsigned long usec)
521 {
522 #if defined(_WIN32)
523 Sleep((usec + 999) / 1000);
524 #else
525 struct timeval tv;
526 tv.tv_sec = usec / 1000000;
527 #if defined(__unix__) || defined(__unix) || \
528 (defined(__APPLE__) && defined(__MACH__))
529 tv.tv_usec = (suseconds_t) usec % 1000000;
530 #else
531 tv.tv_usec = usec % 1000000;
532 #endif
533 select(0, NULL, NULL, NULL, &tv);
534 #endif
535 }
536
537 /*
538 * Read at most 'len' characters
539 */
mbedtls_net_recv(void * ctx,unsigned char * buf,size_t len)540 int mbedtls_net_recv(void *ctx, unsigned char *buf, size_t len)
541 {
542 int ret = MBEDTLS_ERR_ERROR_CORRUPTION_DETECTED;
543 int fd = ((mbedtls_net_context *) ctx)->fd;
544
545 ret = check_fd(fd, 0);
546 if (ret != 0) {
547 return ret;
548 }
549
550 ret = (int) read(fd, buf, len);
551
552 if (ret < 0) {
553 if (net_would_block(ctx) != 0) {
554 return MBEDTLS_ERR_SSL_WANT_READ;
555 }
556
557 #if (defined(_WIN32) || defined(_WIN32_WCE)) && !defined(EFIX64) && \
558 !defined(EFI32)
559 if (WSAGetLastError() == WSAECONNRESET) {
560 return MBEDTLS_ERR_NET_CONN_RESET;
561 }
562 #else
563 if (errno == EPIPE || errno == ECONNRESET) {
564 return MBEDTLS_ERR_NET_CONN_RESET;
565 }
566
567 if (errno == EINTR) {
568 return MBEDTLS_ERR_SSL_WANT_READ;
569 }
570 #endif
571
572 return MBEDTLS_ERR_NET_RECV_FAILED;
573 }
574
575 return ret;
576 }
577
578 /*
579 * Read at most 'len' characters, blocking for at most 'timeout' ms
580 */
mbedtls_net_recv_timeout(void * ctx,unsigned char * buf,size_t len,uint32_t timeout)581 int mbedtls_net_recv_timeout(void *ctx, unsigned char *buf,
582 size_t len, uint32_t timeout)
583 {
584 int ret = MBEDTLS_ERR_ERROR_CORRUPTION_DETECTED;
585 struct timeval tv;
586 fd_set read_fds;
587 int fd = ((mbedtls_net_context *) ctx)->fd;
588
589 ret = check_fd(fd, 1);
590 if (ret != 0) {
591 return ret;
592 }
593
594 FD_ZERO(&read_fds);
595 FD_SET((SOCKET) fd, &read_fds);
596
597 tv.tv_sec = timeout / 1000;
598 tv.tv_usec = (timeout % 1000) * 1000;
599
600 ret = select(fd + 1, &read_fds, NULL, NULL, timeout == 0 ? NULL : &tv);
601
602 /* Zero fds ready means we timed out */
603 if (ret == 0) {
604 return MBEDTLS_ERR_SSL_TIMEOUT;
605 }
606
607 if (ret < 0) {
608 #if (defined(_WIN32) || defined(_WIN32_WCE)) && !defined(EFIX64) && \
609 !defined(EFI32)
610 if (WSAGetLastError() == WSAEINTR) {
611 return MBEDTLS_ERR_SSL_WANT_READ;
612 }
613 #else
614 if (errno == EINTR) {
615 return MBEDTLS_ERR_SSL_WANT_READ;
616 }
617 #endif
618
619 return MBEDTLS_ERR_NET_RECV_FAILED;
620 }
621
622 /* This call will not block */
623 return mbedtls_net_recv(ctx, buf, len);
624 }
625
626 /*
627 * Write at most 'len' characters
628 */
mbedtls_net_send(void * ctx,const unsigned char * buf,size_t len)629 int mbedtls_net_send(void *ctx, const unsigned char *buf, size_t len)
630 {
631 int ret = MBEDTLS_ERR_ERROR_CORRUPTION_DETECTED;
632 int fd = ((mbedtls_net_context *) ctx)->fd;
633
634 ret = check_fd(fd, 0);
635 if (ret != 0) {
636 return ret;
637 }
638
639 ret = (int) write(fd, buf, len);
640
641 if (ret < 0) {
642 if (net_would_block(ctx) != 0) {
643 return MBEDTLS_ERR_SSL_WANT_WRITE;
644 }
645
646 #if (defined(_WIN32) || defined(_WIN32_WCE)) && !defined(EFIX64) && \
647 !defined(EFI32)
648 if (WSAGetLastError() == WSAECONNRESET) {
649 return MBEDTLS_ERR_NET_CONN_RESET;
650 }
651 #else
652 if (errno == EPIPE || errno == ECONNRESET) {
653 return MBEDTLS_ERR_NET_CONN_RESET;
654 }
655
656 if (errno == EINTR) {
657 return MBEDTLS_ERR_SSL_WANT_WRITE;
658 }
659 #endif
660
661 return MBEDTLS_ERR_NET_SEND_FAILED;
662 }
663
664 return ret;
665 }
666
667 /*
668 * Close the connection
669 */
mbedtls_net_close(mbedtls_net_context * ctx)670 void mbedtls_net_close(mbedtls_net_context *ctx)
671 {
672 if (ctx->fd == -1) {
673 return;
674 }
675
676 close(ctx->fd);
677
678 ctx->fd = -1;
679 }
680
681 /*
682 * Gracefully close the connection
683 */
mbedtls_net_free(mbedtls_net_context * ctx)684 void mbedtls_net_free(mbedtls_net_context *ctx)
685 {
686 if (ctx->fd == -1) {
687 return;
688 }
689
690 shutdown(ctx->fd, 2);
691 close(ctx->fd);
692
693 ctx->fd = -1;
694 }
695
696 #endif /* MBEDTLS_NET_C */
697
