xref: /third_party/mbedtls/library/net_sockets.c (revision a8e1175b) 
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
60static 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#include "socket_compat.h"
97#ifdef USE_LWIP
98#include "lwip/sockets.h"
99#endif
100
101/*
102 * Prepare for using the sockets interface
103 */
104static 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        if (WSAStartup(MAKEWORD(2, 0), &wsaData) != 0) {
112            return MBEDTLS_ERR_NET_SOCKET_FAILED;
113        }
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 * Return 0 if the file descriptor is valid, an error otherwise.
127 * If for_select != 0, check whether the file descriptor is within the range
128 * allowed for fd_set used for the FD_xxx macros and the select() function.
129 */
130static int check_fd(int fd, int for_select)
131{
132    if (fd < 0) {
133        return MBEDTLS_ERR_NET_INVALID_CONTEXT;
134    }
135
136#if (defined(_WIN32) || defined(_WIN32_WCE)) && !defined(EFIX64) && \
137    !defined(EFI32)
138    (void) for_select;
139#else
140    /* A limitation of select() is that it only works with file descriptors
141     * that are strictly less than FD_SETSIZE. This is a limitation of the
142     * fd_set type. Error out early, because attempting to call FD_SET on a
143     * large file descriptor is a buffer overflow on typical platforms. */
144    if (for_select && fd >= FD_SETSIZE) {
145        return MBEDTLS_ERR_NET_POLL_FAILED;
146    }
147#endif
148
149    return 0;
150}
151
152/*
153 * Initialize a context
154 */
155void mbedtls_net_init(mbedtls_net_context *ctx)
156{
157    ctx->fd = -1;
158}
159
160/*
161 * Initiate a TCP connection with host:port and the given protocol
162 */
163int mbedtls_net_connect(mbedtls_net_context *ctx, const char *host,
164                        const char *port, int proto)
165{
166    int ret = MBEDTLS_ERR_ERROR_CORRUPTION_DETECTED;
167    struct addrinfo hints, *addr_list, *cur;
168
169    if ((ret = net_prepare()) != 0) {
170        return ret;
171    }
172
173    /* Do name resolution with both IPv6 and IPv4 */
174    memset(&hints, 0, sizeof(hints));
175    hints.ai_family = AF_UNSPEC;
176    hints.ai_socktype = proto == MBEDTLS_NET_PROTO_UDP ? SOCK_DGRAM : SOCK_STREAM;
177    hints.ai_protocol = proto == MBEDTLS_NET_PROTO_UDP ? IPPROTO_UDP : IPPROTO_TCP;
178
179    if (getaddrinfo(host, port, &hints, &addr_list) != 0) {
180        return MBEDTLS_ERR_NET_UNKNOWN_HOST;
181    }
182
183    /* Try the sockaddrs until a connection succeeds */
184    ret = MBEDTLS_ERR_NET_UNKNOWN_HOST;
185    for (cur = addr_list; cur != NULL; cur = cur->ai_next) {
186#ifdef LITEOS_VERSION
187        if (cur->ai_family != AF_INET || cur->ai_socktype != SOCK_STREAM) {
188            continue;
189        }
190        ctx->fd = (int) socket(AF_INET, SOCK_STREAM, 0);
191#else
192        ctx->fd = (int) socket(cur->ai_family, cur->ai_socktype,
193                               cur->ai_protocol);
194#endif
195        if(ctx->fd < 0)
196        {
197            ret = MBEDTLS_ERR_NET_SOCKET_FAILED;
198            continue;
199        }
200
201        if (connect(ctx->fd, cur->ai_addr, MSVC_INT_CAST cur->ai_addrlen) == 0) {
202            ret = 0;
203            break;
204        }
205
206#ifdef USE_LWIP
207        lwip_close(ctx->fd);
208#else
209        close(ctx->fd);
210#endif
211        ret = MBEDTLS_ERR_NET_CONNECT_FAILED;
212    }
213
214    freeaddrinfo(addr_list);
215
216    return ret;
217}
218
219/*
220 * Create a listening socket on bind_ip:port
221 */
222int mbedtls_net_bind(mbedtls_net_context *ctx, const char *bind_ip, const char *port, int proto)
223{
224    int n, ret;
225    struct addrinfo hints, *addr_list, *cur;
226
227    if ((ret = net_prepare()) != 0) {
228        return ret;
229    }
230
231    /* Bind to IPv6 and/or IPv4, but only in the desired protocol */
232    memset(&hints, 0, sizeof(hints));
233    hints.ai_family = AF_UNSPEC;
234    hints.ai_socktype = proto == MBEDTLS_NET_PROTO_UDP ? SOCK_DGRAM : SOCK_STREAM;
235    hints.ai_protocol = proto == MBEDTLS_NET_PROTO_UDP ? IPPROTO_UDP : IPPROTO_TCP;
236    if (bind_ip == NULL) {
237        hints.ai_flags = AI_PASSIVE;
238    }
239
240    if (getaddrinfo(bind_ip, port, &hints, &addr_list) != 0) {
241        return MBEDTLS_ERR_NET_UNKNOWN_HOST;
242    }
243
244    /* Try the sockaddrs until a binding succeeds */
245    ret = MBEDTLS_ERR_NET_UNKNOWN_HOST;
246    for (cur = addr_list; cur != NULL; cur = cur->ai_next) {
247        ctx->fd = (int) socket(cur->ai_family, cur->ai_socktype,
248                               cur->ai_protocol);
249        if (ctx->fd < 0) {
250            ret = MBEDTLS_ERR_NET_SOCKET_FAILED;
251            continue;
252        }
253
254        n = 1;
255        if (setsockopt(ctx->fd, SOL_SOCKET, SO_REUSEADDR,
256                       (const char *) &n, sizeof( n )) != 0) {
257#ifdef USE_LWIP
258            lwip_close(ctx->fd);
259#else
260            close(ctx->fd);
261#endif
262            ret = MBEDTLS_ERR_NET_SOCKET_FAILED;
263            continue;
264        }
265
266        if (bind(ctx->fd, cur->ai_addr, MSVC_INT_CAST cur->ai_addrlen) != 0) {
267#ifdef USE_LWIP
268            lwip_close(ctx->fd);
269#else
270            close(ctx->fd);
271#endif
272            ret = MBEDTLS_ERR_NET_BIND_FAILED;
273            continue;
274        }
275
276        /* Listen only makes sense for TCP */
277        if (proto == MBEDTLS_NET_PROTO_TCP) {
278            if (listen(ctx->fd, MBEDTLS_NET_LISTEN_BACKLOG) != 0) {
279#ifdef USE_LWIP
280                lwip_close(ctx->fd);
281#else
282                close(ctx->fd);
283#endif
284                ret = MBEDTLS_ERR_NET_LISTEN_FAILED;
285                continue;
286            }
287        }
288
289        /* Bind was successful */
290        ret = 0;
291        break;
292    }
293
294    freeaddrinfo(addr_list);
295
296    return ret;
297
298}
299
300#if (defined(_WIN32) || defined(_WIN32_WCE)) && !defined(EFIX64) && \
301    !defined(EFI32)
302/*
303 * Check if the requested operation would be blocking on a non-blocking socket
304 * and thus 'failed' with a negative return value.
305 */
306static int net_would_block(const mbedtls_net_context *ctx)
307{
308    ((void) ctx);
309    return WSAGetLastError() == WSAEWOULDBLOCK;
310}
311#else
312/*
313 * Check if the requested operation would be blocking on a non-blocking socket
314 * and thus 'failed' with a negative return value.
315 *
316 * Note: on a blocking socket this function always returns 0!
317 */
318static int net_would_block(const mbedtls_net_context *ctx)
319{
320    int err = errno;
321
322    /*
323     * Never return 'WOULD BLOCK' on a blocking socket
324     */
325#ifdef USE_LWIP
326    if ((lwip_fcntl(ctx->fd, F_GETFL, 0) & O_NONBLOCK) != O_NONBLOCK) {
327#else
328    if ((fcntl(ctx->fd, F_GETFL) & O_NONBLOCK) != O_NONBLOCK) {
329#endif
330        errno = err;
331        return 0;
332    }
333
334    switch (errno = err) {
335#if defined EAGAIN
336        case EAGAIN:
337#endif
338#if defined EWOULDBLOCK && EWOULDBLOCK != EAGAIN
339        case EWOULDBLOCK:
340#endif
341    return 1;
342    }
343    return 0;
344}
345#endif /* ( _WIN32 || _WIN32_WCE ) && !EFIX64 && !EFI32 */
346
347/*
348 * Accept a connection from a remote client
349 */
350int mbedtls_net_accept(mbedtls_net_context *bind_ctx,
351                       mbedtls_net_context *client_ctx,
352                       void *client_ip, size_t buf_size, size_t *cip_len)
353{
354    int ret = MBEDTLS_ERR_ERROR_CORRUPTION_DETECTED;
355    int type;
356
357    struct sockaddr_storage client_addr;
358
359#if defined(__socklen_t_defined) || defined(_SOCKLEN_T) ||  \
360    defined(_SOCKLEN_T_DECLARED) || defined(__DEFINED_socklen_t) || \
361    defined(socklen_t) || (defined(_POSIX_VERSION) && _POSIX_VERSION >= 200112L)
362    socklen_t n = (socklen_t) sizeof(client_addr);
363    socklen_t type_len = (socklen_t) sizeof(type);
364#else
365    int n = (int) sizeof(client_addr);
366    int type_len = (int) sizeof(type);
367#endif
368
369    /* Is this a TCP or UDP socket? */
370    if (getsockopt(bind_ctx->fd, SOL_SOCKET, SO_TYPE,
371                   (void *) &type, &type_len) != 0 ||
372        (type != SOCK_STREAM && type != SOCK_DGRAM)) {
373        return MBEDTLS_ERR_NET_ACCEPT_FAILED;
374    }
375
376    if (type == SOCK_STREAM) {
377        /* TCP: actual accept() */
378        ret = client_ctx->fd = (int) accept(bind_ctx->fd,
379                                            (struct sockaddr *) &client_addr, &n);
380    } else {
381        /* UDP: wait for a message, but keep it in the queue */
382        char buf[1] = { 0 };
383
384        ret = (int) recvfrom(bind_ctx->fd, buf, sizeof(buf), MSG_PEEK,
385                             (struct sockaddr *) &client_addr, &n);
386
387#if defined(_WIN32)
388        if (ret == SOCKET_ERROR &&
389            WSAGetLastError() == WSAEMSGSIZE) {
390            /* We know buf is too small, thanks, just peeking here */
391            ret = 0;
392        }
393#endif
394    }
395
396    if (ret < 0) {
397        if (net_would_block(bind_ctx) != 0) {
398            return MBEDTLS_ERR_SSL_WANT_READ;
399        }
400
401        return MBEDTLS_ERR_NET_ACCEPT_FAILED;
402    }
403
404    /* UDP: hijack the listening socket to communicate with the client,
405     * then bind a new socket to accept new connections */
406    if (type != SOCK_STREAM) {
407        struct sockaddr_storage local_addr;
408        int one = 1;
409
410        if (connect(bind_ctx->fd, (struct sockaddr *) &client_addr, n) != 0) {
411            return MBEDTLS_ERR_NET_ACCEPT_FAILED;
412        }
413
414        client_ctx->fd = bind_ctx->fd;
415        bind_ctx->fd   = -1; /* In case we exit early */
416
417        n = sizeof(struct sockaddr_storage);
418        if (getsockname(client_ctx->fd,
419                        (struct sockaddr *) &local_addr, &n) != 0 ||
420            (bind_ctx->fd = (int) socket(local_addr.ss_family,
421                                         SOCK_DGRAM, IPPROTO_UDP)) < 0 ||
422            setsockopt(bind_ctx->fd, SOL_SOCKET, SO_REUSEADDR,
423                       (const char *) &one, sizeof(one)) != 0) {
424            return MBEDTLS_ERR_NET_SOCKET_FAILED;
425        }
426
427        if (bind(bind_ctx->fd, (struct sockaddr *) &local_addr, n) != 0) {
428            return MBEDTLS_ERR_NET_BIND_FAILED;
429        }
430    }
431
432    if (client_ip != NULL) {
433        if (client_addr.ss_family == AF_INET) {
434            struct sockaddr_in *addr4 = (struct sockaddr_in *) &client_addr;
435            *cip_len = sizeof(addr4->sin_addr.s_addr);
436
437            if (buf_size < *cip_len) {
438                return MBEDTLS_ERR_NET_BUFFER_TOO_SMALL;
439            }
440
441            memcpy(client_ip, &addr4->sin_addr.s_addr, *cip_len);
442        } else {
443            struct sockaddr_in6 *addr6 = (struct sockaddr_in6 *) &client_addr;
444            *cip_len = sizeof(addr6->sin6_addr.s6_addr);
445
446            if (buf_size < *cip_len) {
447                return MBEDTLS_ERR_NET_BUFFER_TOO_SMALL;
448            }
449
450            memcpy(client_ip, &addr6->sin6_addr.s6_addr, *cip_len);
451        }
452    }
453
454    return 0;
455}
456
457/*
458 * Set the socket blocking or non-blocking
459 */
460int mbedtls_net_set_block(mbedtls_net_context *ctx)
461{
462#if (defined(_WIN32) || defined(_WIN32_WCE)) && !defined(EFIX64) && \
463    !defined(EFI32)
464    u_long n = 0;
465    return ioctlsocket(ctx->fd, FIONBIO, &n);
466#else
467#ifdef USE_LWIP
468    return lwip_fcntl(ctx->fd, F_SETFL, lwip_fcntl(ctx->fd, F_GETFL, 0) & ~O_NONBLOCK);
469#else
470    return fcntl(ctx->fd, F_SETFL, fcntl(ctx->fd, F_GETFL) & ~O_NONBLOCK);
471#endif // USE_LWIP
472#endif
473}
474
475int mbedtls_net_set_nonblock(mbedtls_net_context *ctx)
476{
477#if (defined(_WIN32) || defined(_WIN32_WCE)) && !defined(EFIX64) && \
478    !defined(EFI32)
479    u_long n = 1;
480    return ioctlsocket(ctx->fd, FIONBIO, &n);
481#else
482#ifdef USE_LWIP
483    return lwip_fcntl(ctx->fd, F_SETFL, lwip_fcntl(ctx->fd, F_GETFL, 0) | O_NONBLOCK);
484#else
485    return fcntl(ctx->fd, F_SETFL, fcntl(ctx->fd, F_GETFL) | O_NONBLOCK);
486#endif // USE_LWIP
487#endif
488}
489
490/*
491 * Check if data is available on the socket
492 */
493
494int mbedtls_net_poll(mbedtls_net_context *ctx, uint32_t rw, uint32_t timeout)
495{
496    int ret = MBEDTLS_ERR_ERROR_CORRUPTION_DETECTED;
497    struct timeval tv;
498
499    fd_set read_fds;
500    fd_set write_fds;
501
502    int fd = ctx->fd;
503
504    ret = check_fd(fd, 1);
505    if (ret != 0) {
506        return ret;
507    }
508
509#if defined(__has_feature)
510#if __has_feature(memory_sanitizer)
511    /* Ensure that memory sanitizers consider read_fds and write_fds as
512     * initialized even on platforms such as Glibc/x86_64 where FD_ZERO
513     * is implemented in assembly. */
514    memset(&read_fds, 0, sizeof(read_fds));
515    memset(&write_fds, 0, sizeof(write_fds));
516#endif
517#endif
518
519    FD_ZERO(&read_fds);
520    if (rw & MBEDTLS_NET_POLL_READ) {
521        rw &= ~MBEDTLS_NET_POLL_READ;
522        FD_SET((SOCKET) fd, &read_fds);
523    }
524
525    FD_ZERO(&write_fds);
526    if (rw & MBEDTLS_NET_POLL_WRITE) {
527        rw &= ~MBEDTLS_NET_POLL_WRITE;
528        FD_SET((SOCKET) fd, &write_fds);
529    }
530
531    if (rw != 0) {
532        return MBEDTLS_ERR_NET_BAD_INPUT_DATA;
533    }
534
535    tv.tv_sec  = timeout / 1000;
536    tv.tv_usec = (timeout % 1000) * 1000;
537
538    do {
539        ret = select(fd + 1, &read_fds, &write_fds, NULL,
540                     timeout == (uint32_t) -1 ? NULL : &tv);
541    } while (IS_EINTR(ret));
542
543    if (ret < 0) {
544        return MBEDTLS_ERR_NET_POLL_FAILED;
545    }
546
547    ret = 0;
548    if (FD_ISSET(fd, &read_fds)) {
549        ret |= MBEDTLS_NET_POLL_READ;
550    }
551    if (FD_ISSET(fd, &write_fds)) {
552        ret |= MBEDTLS_NET_POLL_WRITE;
553    }
554
555    return ret;
556}
557
558/*
559 * Portable usleep helper
560 */
561void mbedtls_net_usleep(unsigned long usec)
562{
563#if defined(_WIN32)
564    Sleep((usec + 999) / 1000);
565#else
566    struct timeval tv;
567    tv.tv_sec  = usec / 1000000;
568#if defined(__unix__) || defined(__unix) || \
569    (defined(__APPLE__) && defined(__MACH__))
570    tv.tv_usec = (suseconds_t) usec % 1000000;
571#else
572    tv.tv_usec = usec % 1000000;
573#endif
574    select(0, NULL, NULL, NULL, &tv);
575#endif
576}
577
578/*
579 * Read at most 'len' characters
580 */
581int mbedtls_net_recv(void *ctx, unsigned char *buf, size_t len)
582{
583    int ret = MBEDTLS_ERR_ERROR_CORRUPTION_DETECTED;
584    int fd = ((mbedtls_net_context *) ctx)->fd;
585
586    ret = check_fd(fd, 0);
587    if (ret != 0) {
588        return ret;
589    }
590#ifdef LITEOS_VERSION
591    ret = (int) recv( fd, buf, len, 0);
592#else
593
594    ret = (int) read(fd, buf, len);
595#endif
596
597    if (ret < 0) {
598        if (net_would_block(ctx) != 0) {
599            return MBEDTLS_ERR_SSL_WANT_READ;
600        }
601
602#if (defined(_WIN32) || defined(_WIN32_WCE)) && !defined(EFIX64) && \
603        !defined(EFI32)
604        if (WSAGetLastError() == WSAECONNRESET) {
605            return MBEDTLS_ERR_NET_CONN_RESET;
606        }
607#else
608        if (errno == EPIPE || errno == ECONNRESET) {
609            return MBEDTLS_ERR_NET_CONN_RESET;
610        }
611
612        if (errno == EINTR) {
613            return MBEDTLS_ERR_SSL_WANT_READ;
614        }
615#endif
616
617        return MBEDTLS_ERR_NET_RECV_FAILED;
618    }
619
620    return ret;
621}
622
623/*
624 * Read at most 'len' characters, blocking for at most 'timeout' ms
625 */
626int mbedtls_net_recv_timeout(void *ctx, unsigned char *buf,
627                             size_t len, uint32_t timeout)
628{
629    int ret = MBEDTLS_ERR_ERROR_CORRUPTION_DETECTED;
630    struct timeval tv;
631    fd_set read_fds;
632    int fd = ((mbedtls_net_context *) ctx)->fd;
633
634    ret = check_fd(fd, 1);
635    if (ret != 0) {
636        return ret;
637    }
638
639    FD_ZERO(&read_fds);
640    FD_SET((SOCKET) fd, &read_fds);
641
642    tv.tv_sec  = timeout / 1000;
643    tv.tv_usec = (timeout % 1000) * 1000;
644
645    ret = select(fd + 1, &read_fds, NULL, NULL, timeout == 0 ? NULL : &tv);
646
647    /* Zero fds ready means we timed out */
648    if (ret == 0) {
649        return MBEDTLS_ERR_SSL_TIMEOUT;
650    }
651
652    if (ret < 0) {
653#if (defined(_WIN32) || defined(_WIN32_WCE)) && !defined(EFIX64) && \
654        !defined(EFI32)
655        if (WSAGetLastError() == WSAEINTR) {
656            return MBEDTLS_ERR_SSL_WANT_READ;
657        }
658#else
659        if (errno == EINTR) {
660            return MBEDTLS_ERR_SSL_WANT_READ;
661        }
662#endif
663
664        return MBEDTLS_ERR_NET_RECV_FAILED;
665    }
666
667    /* This call will not block */
668    return mbedtls_net_recv(ctx, buf, len);
669}
670
671/*
672 * Write at most 'len' characters
673 */
674int mbedtls_net_send(void *ctx, const unsigned char *buf, size_t len)
675{
676    int ret = MBEDTLS_ERR_ERROR_CORRUPTION_DETECTED;
677    int fd = ((mbedtls_net_context *) ctx)->fd;
678
679    ret = check_fd(fd, 0);
680    if (ret != 0) {
681        return ret;
682    }
683
684#ifdef LITEOS_VERSION
685    ret = (int) send(fd, buf, len, 0);
686#else
687
688    ret = (int) write(fd, buf, len);
689#endif
690
691    if (ret < 0) {
692        if (net_would_block(ctx) != 0) {
693            return MBEDTLS_ERR_SSL_WANT_WRITE;
694        }
695
696#if (defined(_WIN32) || defined(_WIN32_WCE)) && !defined(EFIX64) && \
697        !defined(EFI32)
698        if (WSAGetLastError() == WSAECONNRESET) {
699            return MBEDTLS_ERR_NET_CONN_RESET;
700        }
701#else
702        if (errno == EPIPE || errno == ECONNRESET) {
703            return MBEDTLS_ERR_NET_CONN_RESET;
704        }
705
706        if (errno == EINTR) {
707            return MBEDTLS_ERR_SSL_WANT_WRITE;
708        }
709#endif
710
711        return MBEDTLS_ERR_NET_SEND_FAILED;
712    }
713
714    return ret;
715}
716
717/*
718 * Close the connection
719 */
720void mbedtls_net_close(mbedtls_net_context *ctx)
721{
722    if (ctx->fd == -1) {
723        return;
724    }
725#ifdef USE_LWIP
726    lwip_close(ctx->fd);
727#else
728    close(ctx->fd);
729#endif
730
731    ctx->fd = -1;
732}
733
734/*
735 * Gracefully close the connection
736 */
737void mbedtls_net_free(mbedtls_net_context *ctx)
738{
739    if (ctx->fd == -1) {
740        return;
741    }
742#ifdef USE_LWIP
743    lwip_shutdown(ctx->fd, 2);
744    lwip_close(ctx->fd);
745#else
746    shutdown(ctx->fd, 2);
747    close(ctx->fd);
748#endif
749
750    ctx->fd = -1;
751}
752
753#endif /* MBEDTLS_NET_C */
754