| /* |
| * TCP/IP or UDP/IP networking functions |
| * |
| * Copyright The Mbed TLS Contributors |
| * SPDX-License-Identifier: Apache-2.0 OR GPL-2.0-or-later |
| */ |
| |
| /* Enable definition of getaddrinfo() even when compiling with -std=c99. Must |
| * be set before mbedtls_config.h, which pulls in glibc's features.h indirectly. |
| * Harmless on other platforms. */ |
| #ifndef _POSIX_C_SOURCE |
| #define _POSIX_C_SOURCE 200112L |
| #endif |
| #ifndef _XOPEN_SOURCE |
| #define _XOPEN_SOURCE 600 /* sockaddr_storage */ |
| #endif |
| |
| #include "common.h" |
| |
| #if defined(MBEDTLS_NET_C) |
| |
| #if !defined(unix) && !defined(__unix__) && !defined(__unix) && \ |
| !defined(__APPLE__) && !defined(_WIN32) && !defined(__QNXNTO__) && \ |
| !defined(__HAIKU__) && !defined(__midipix__) |
| #error "This module only works on Unix and Windows, see MBEDTLS_NET_C in mbedtls_config.h" |
| #endif |
| |
| #include "mbedtls/platform.h" |
| |
| #include "mbedtls/net_sockets.h" |
| #include "mbedtls/error.h" |
| |
| #include <string.h> |
| |
| #if (defined(_WIN32) || defined(_WIN32_WCE)) && !defined(EFIX64) && \ |
| !defined(EFI32) |
| |
| #define IS_EINTR(ret) ((ret) == WSAEINTR) |
| |
| #include <ws2tcpip.h> |
| |
| #include <winsock2.h> |
| #include <windows.h> |
| #if (_WIN32_WINNT < 0x0501) |
| #include <wspiapi.h> |
| #endif |
| |
| #if defined(_MSC_VER) |
| #if defined(_WIN32_WCE) |
| #pragma comment( lib, "ws2.lib" ) |
| #else |
| #pragma comment( lib, "ws2_32.lib" ) |
| #endif |
| #endif /* _MSC_VER */ |
| |
| #define read(fd, buf, len) recv(fd, (char *) (buf), (int) (len), 0) |
| #define write(fd, buf, len) send(fd, (char *) (buf), (int) (len), 0) |
| #define close(fd) closesocket(fd) |
| |
| static int wsa_init_done = 0; |
| |
| #else /* ( _WIN32 || _WIN32_WCE ) && !EFIX64 && !EFI32 */ |
| |
| #include <sys/types.h> |
| #include <sys/socket.h> |
| #include <netinet/in.h> |
| #include <arpa/inet.h> |
| #include <sys/time.h> |
| #include <unistd.h> |
| #include <signal.h> |
| #include <fcntl.h> |
| #include <netdb.h> |
| #include <errno.h> |
| |
| #define IS_EINTR(ret) ((ret) == EINTR) |
| #define SOCKET int |
| |
| #endif /* ( _WIN32 || _WIN32_WCE ) && !EFIX64 && !EFI32 */ |
| |
| /* Some MS functions want int and MSVC warns if we pass size_t, |
| * but the standard functions use socklen_t, so cast only for MSVC */ |
| #if defined(_MSC_VER) |
| #define MSVC_INT_CAST (int) |
| #else |
| #define MSVC_INT_CAST |
| #endif |
| |
| #include <stdio.h> |
| |
| #if defined(MBEDTLS_HAVE_TIME) |
| #include <time.h> |
| #endif |
| |
| #include <stdint.h> |
| |
| /* |
| * Prepare for using the sockets interface |
| */ |
| static int net_prepare(void) |
| { |
| #if (defined(_WIN32) || defined(_WIN32_WCE)) && !defined(EFIX64) && \ |
| !defined(EFI32) |
| WSADATA wsaData; |
| |
| if (wsa_init_done == 0) { |
| if (WSAStartup(MAKEWORD(2, 0), &wsaData) != 0) { |
| return MBEDTLS_ERR_NET_SOCKET_FAILED; |
| } |
| |
| wsa_init_done = 1; |
| } |
| #else |
| #if !defined(EFIX64) && !defined(EFI32) |
| signal(SIGPIPE, SIG_IGN); |
| #endif |
| #endif |
| return 0; |
| } |
| |
| /* |
| * Return 0 if the file descriptor is valid, an error otherwise. |
| * If for_select != 0, check whether the file descriptor is within the range |
| * allowed for fd_set used for the FD_xxx macros and the select() function. |
| */ |
| static int check_fd(int fd, int for_select) |
| { |
| if (fd < 0) { |
| return MBEDTLS_ERR_NET_INVALID_CONTEXT; |
| } |
| |
| #if (defined(_WIN32) || defined(_WIN32_WCE)) && !defined(EFIX64) && \ |
| !defined(EFI32) |
| (void) for_select; |
| #else |
| /* A limitation of select() is that it only works with file descriptors |
| * that are strictly less than FD_SETSIZE. This is a limitation of the |
| * fd_set type. Error out early, because attempting to call FD_SET on a |
| * large file descriptor is a buffer overflow on typical platforms. */ |
| if (for_select && fd >= FD_SETSIZE) { |
| return MBEDTLS_ERR_NET_POLL_FAILED; |
| } |
| #endif |
| |
| return 0; |
| } |
| |
| /* |
| * Initialize a context |
| */ |
| void mbedtls_net_init(mbedtls_net_context *ctx) |
| { |
| ctx->fd = -1; |
| } |
| |
| /* |
| * Initiate a TCP connection with host:port and the given protocol |
| */ |
| int mbedtls_net_connect(mbedtls_net_context *ctx, const char *host, |
| const char *port, int proto) |
| { |
| int ret = MBEDTLS_ERR_ERROR_CORRUPTION_DETECTED; |
| struct addrinfo hints, *addr_list, *cur; |
| |
| if ((ret = net_prepare()) != 0) { |
| return ret; |
| } |
| |
| /* Do name resolution with both IPv6 and IPv4 */ |
| memset(&hints, 0, sizeof(hints)); |
| hints.ai_family = AF_UNSPEC; |
| hints.ai_socktype = proto == MBEDTLS_NET_PROTO_UDP ? SOCK_DGRAM : SOCK_STREAM; |
| hints.ai_protocol = proto == MBEDTLS_NET_PROTO_UDP ? IPPROTO_UDP : IPPROTO_TCP; |
| |
| if (getaddrinfo(host, port, &hints, &addr_list) != 0) { |
| return MBEDTLS_ERR_NET_UNKNOWN_HOST; |
| } |
| |
| /* Try the sockaddrs until a connection succeeds */ |
| ret = MBEDTLS_ERR_NET_UNKNOWN_HOST; |
| for (cur = addr_list; cur != NULL; cur = cur->ai_next) { |
| ctx->fd = (int) socket(cur->ai_family, cur->ai_socktype, |
| cur->ai_protocol); |
| if (ctx->fd < 0) { |
| ret = MBEDTLS_ERR_NET_SOCKET_FAILED; |
| continue; |
| } |
| |
| if (connect(ctx->fd, cur->ai_addr, MSVC_INT_CAST cur->ai_addrlen) == 0) { |
| ret = 0; |
| break; |
| } |
| |
| close(ctx->fd); |
| ret = MBEDTLS_ERR_NET_CONNECT_FAILED; |
| } |
| |
| freeaddrinfo(addr_list); |
| |
| return ret; |
| } |
| |
| /* |
| * Create a listening socket on bind_ip:port |
| */ |
| int mbedtls_net_bind(mbedtls_net_context *ctx, const char *bind_ip, const char *port, int proto) |
| { |
| int n, ret; |
| struct addrinfo hints, *addr_list, *cur; |
| |
| if ((ret = net_prepare()) != 0) { |
| return ret; |
| } |
| |
| /* Bind to IPv6 and/or IPv4, but only in the desired protocol */ |
| memset(&hints, 0, sizeof(hints)); |
| hints.ai_family = AF_UNSPEC; |
| hints.ai_socktype = proto == MBEDTLS_NET_PROTO_UDP ? SOCK_DGRAM : SOCK_STREAM; |
| hints.ai_protocol = proto == MBEDTLS_NET_PROTO_UDP ? IPPROTO_UDP : IPPROTO_TCP; |
| if (bind_ip == NULL) { |
| hints.ai_flags = AI_PASSIVE; |
| } |
| |
| if (getaddrinfo(bind_ip, port, &hints, &addr_list) != 0) { |
| return MBEDTLS_ERR_NET_UNKNOWN_HOST; |
| } |
| |
| /* Try the sockaddrs until a binding succeeds */ |
| ret = MBEDTLS_ERR_NET_UNKNOWN_HOST; |
| for (cur = addr_list; cur != NULL; cur = cur->ai_next) { |
| ctx->fd = (int) socket(cur->ai_family, cur->ai_socktype, |
| cur->ai_protocol); |
| if (ctx->fd < 0) { |
| ret = MBEDTLS_ERR_NET_SOCKET_FAILED; |
| continue; |
| } |
| |
| n = 1; |
| if (setsockopt(ctx->fd, SOL_SOCKET, SO_REUSEADDR, |
| (const char *) &n, sizeof(n)) != 0) { |
| close(ctx->fd); |
| ret = MBEDTLS_ERR_NET_SOCKET_FAILED; |
| continue; |
| } |
| |
| if (bind(ctx->fd, cur->ai_addr, MSVC_INT_CAST cur->ai_addrlen) != 0) { |
| close(ctx->fd); |
| ret = MBEDTLS_ERR_NET_BIND_FAILED; |
| continue; |
| } |
| |
| /* Listen only makes sense for TCP */ |
| if (proto == MBEDTLS_NET_PROTO_TCP) { |
| if (listen(ctx->fd, MBEDTLS_NET_LISTEN_BACKLOG) != 0) { |
| close(ctx->fd); |
| ret = MBEDTLS_ERR_NET_LISTEN_FAILED; |
| continue; |
| } |
| } |
| |
| /* Bind was successful */ |
| ret = 0; |
| break; |
| } |
| |
| freeaddrinfo(addr_list); |
| |
| return ret; |
| |
| } |
| |
| #if (defined(_WIN32) || defined(_WIN32_WCE)) && !defined(EFIX64) && \ |
| !defined(EFI32) |
| /* |
| * Check if the requested operation would be blocking on a non-blocking socket |
| * and thus 'failed' with a negative return value. |
| */ |
| static int net_would_block(const mbedtls_net_context *ctx) |
| { |
| ((void) ctx); |
| return WSAGetLastError() == WSAEWOULDBLOCK; |
| } |
| #else |
| /* |
| * Check if the requested operation would be blocking on a non-blocking socket |
| * and thus 'failed' with a negative return value. |
| * |
| * Note: on a blocking socket this function always returns 0! |
| */ |
| static int net_would_block(const mbedtls_net_context *ctx) |
| { |
| int err = errno; |
| |
| /* |
| * Never return 'WOULD BLOCK' on a blocking socket |
| */ |
| if ((fcntl(ctx->fd, F_GETFL) & O_NONBLOCK) != O_NONBLOCK) { |
| errno = err; |
| return 0; |
| } |
| |
| switch (errno = err) { |
| #if defined EAGAIN |
| case EAGAIN: |
| #endif |
| #if defined EWOULDBLOCK && EWOULDBLOCK != EAGAIN |
| case EWOULDBLOCK: |
| #endif |
| return 1; |
| } |
| return 0; |
| } |
| #endif /* ( _WIN32 || _WIN32_WCE ) && !EFIX64 && !EFI32 */ |
| |
| /* |
| * Accept a connection from a remote client |
| */ |
| int mbedtls_net_accept(mbedtls_net_context *bind_ctx, |
| mbedtls_net_context *client_ctx, |
| void *client_ip, size_t buf_size, size_t *cip_len) |
| { |
| int ret = MBEDTLS_ERR_ERROR_CORRUPTION_DETECTED; |
| int type; |
| |
| struct sockaddr_storage client_addr; |
| |
| #if defined(__socklen_t_defined) || defined(_SOCKLEN_T) || \ |
| defined(_SOCKLEN_T_DECLARED) || defined(__DEFINED_socklen_t) || \ |
| defined(socklen_t) || (defined(_POSIX_VERSION) && _POSIX_VERSION >= 200112L) |
| socklen_t n = (socklen_t) sizeof(client_addr); |
| socklen_t type_len = (socklen_t) sizeof(type); |
| #else |
| int n = (int) sizeof(client_addr); |
| int type_len = (int) sizeof(type); |
| #endif |
| |
| /* Is this a TCP or UDP socket? */ |
| if (getsockopt(bind_ctx->fd, SOL_SOCKET, SO_TYPE, |
| (void *) &type, &type_len) != 0 || |
| (type != SOCK_STREAM && type != SOCK_DGRAM)) { |
| return MBEDTLS_ERR_NET_ACCEPT_FAILED; |
| } |
| |
| if (type == SOCK_STREAM) { |
| /* TCP: actual accept() */ |
| ret = client_ctx->fd = (int) accept(bind_ctx->fd, |
| (struct sockaddr *) &client_addr, &n); |
| } else { |
| /* UDP: wait for a message, but keep it in the queue */ |
| char buf[1] = { 0 }; |
| |
| ret = (int) recvfrom(bind_ctx->fd, buf, sizeof(buf), MSG_PEEK, |
| (struct sockaddr *) &client_addr, &n); |
| |
| #if defined(_WIN32) |
| if (ret == SOCKET_ERROR && |
| WSAGetLastError() == WSAEMSGSIZE) { |
| /* We know buf is too small, thanks, just peeking here */ |
| ret = 0; |
| } |
| #endif |
| } |
| |
| if (ret < 0) { |
| if (net_would_block(bind_ctx) != 0) { |
| return MBEDTLS_ERR_SSL_WANT_READ; |
| } |
| |
| return MBEDTLS_ERR_NET_ACCEPT_FAILED; |
| } |
| |
| /* UDP: hijack the listening socket to communicate with the client, |
| * then bind a new socket to accept new connections */ |
| if (type != SOCK_STREAM) { |
| struct sockaddr_storage local_addr; |
| int one = 1; |
| |
| if (connect(bind_ctx->fd, (struct sockaddr *) &client_addr, n) != 0) { |
| return MBEDTLS_ERR_NET_ACCEPT_FAILED; |
| } |
| |
| client_ctx->fd = bind_ctx->fd; |
| bind_ctx->fd = -1; /* In case we exit early */ |
| |
| n = sizeof(struct sockaddr_storage); |
| if (getsockname(client_ctx->fd, |
| (struct sockaddr *) &local_addr, &n) != 0 || |
| (bind_ctx->fd = (int) socket(local_addr.ss_family, |
| SOCK_DGRAM, IPPROTO_UDP)) < 0 || |
| setsockopt(bind_ctx->fd, SOL_SOCKET, SO_REUSEADDR, |
| (const char *) &one, sizeof(one)) != 0) { |
| return MBEDTLS_ERR_NET_SOCKET_FAILED; |
| } |
| |
| if (bind(bind_ctx->fd, (struct sockaddr *) &local_addr, n) != 0) { |
| return MBEDTLS_ERR_NET_BIND_FAILED; |
| } |
| } |
| |
| if (client_ip != NULL) { |
| if (client_addr.ss_family == AF_INET) { |
| struct sockaddr_in *addr4 = (struct sockaddr_in *) &client_addr; |
| *cip_len = sizeof(addr4->sin_addr.s_addr); |
| |
| if (buf_size < *cip_len) { |
| return MBEDTLS_ERR_NET_BUFFER_TOO_SMALL; |
| } |
| |
| memcpy(client_ip, &addr4->sin_addr.s_addr, *cip_len); |
| } else { |
| struct sockaddr_in6 *addr6 = (struct sockaddr_in6 *) &client_addr; |
| *cip_len = sizeof(addr6->sin6_addr.s6_addr); |
| |
| if (buf_size < *cip_len) { |
| return MBEDTLS_ERR_NET_BUFFER_TOO_SMALL; |
| } |
| |
| memcpy(client_ip, &addr6->sin6_addr.s6_addr, *cip_len); |
| } |
| } |
| |
| return 0; |
| } |
| |
| /* |
| * Set the socket blocking or non-blocking |
| */ |
| int mbedtls_net_set_block(mbedtls_net_context *ctx) |
| { |
| #if (defined(_WIN32) || defined(_WIN32_WCE)) && !defined(EFIX64) && \ |
| !defined(EFI32) |
| u_long n = 0; |
| return ioctlsocket(ctx->fd, FIONBIO, &n); |
| #else |
| return fcntl(ctx->fd, F_SETFL, fcntl(ctx->fd, F_GETFL) & ~O_NONBLOCK); |
| #endif |
| } |
| |
| int mbedtls_net_set_nonblock(mbedtls_net_context *ctx) |
| { |
| #if (defined(_WIN32) || defined(_WIN32_WCE)) && !defined(EFIX64) && \ |
| !defined(EFI32) |
| u_long n = 1; |
| return ioctlsocket(ctx->fd, FIONBIO, &n); |
| #else |
| return fcntl(ctx->fd, F_SETFL, fcntl(ctx->fd, F_GETFL) | O_NONBLOCK); |
| #endif |
| } |
| |
| /* |
| * Check if data is available on the socket |
| */ |
| |
| int mbedtls_net_poll(mbedtls_net_context *ctx, uint32_t rw, uint32_t timeout) |
| { |
| int ret = MBEDTLS_ERR_ERROR_CORRUPTION_DETECTED; |
| struct timeval tv; |
| |
| fd_set read_fds; |
| fd_set write_fds; |
| |
| int fd = ctx->fd; |
| |
| ret = check_fd(fd, 1); |
| if (ret != 0) { |
| return ret; |
| } |
| |
| #if defined(__has_feature) |
| #if __has_feature(memory_sanitizer) |
| /* Ensure that memory sanitizers consider read_fds and write_fds as |
| * initialized even on platforms such as Glibc/x86_64 where FD_ZERO |
| * is implemented in assembly. */ |
| memset(&read_fds, 0, sizeof(read_fds)); |
| memset(&write_fds, 0, sizeof(write_fds)); |
| #endif |
| #endif |
| |
| FD_ZERO(&read_fds); |
| if (rw & MBEDTLS_NET_POLL_READ) { |
| rw &= ~MBEDTLS_NET_POLL_READ; |
| FD_SET((SOCKET) fd, &read_fds); |
| } |
| |
| FD_ZERO(&write_fds); |
| if (rw & MBEDTLS_NET_POLL_WRITE) { |
| rw &= ~MBEDTLS_NET_POLL_WRITE; |
| FD_SET((SOCKET) fd, &write_fds); |
| } |
| |
| if (rw != 0) { |
| return MBEDTLS_ERR_NET_BAD_INPUT_DATA; |
| } |
| |
| tv.tv_sec = timeout / 1000; |
| tv.tv_usec = (timeout % 1000) * 1000; |
| |
| do { |
| ret = select(fd + 1, &read_fds, &write_fds, NULL, |
| timeout == (uint32_t) -1 ? NULL : &tv); |
| } while (IS_EINTR(ret)); |
| |
| if (ret < 0) { |
| return MBEDTLS_ERR_NET_POLL_FAILED; |
| } |
| |
| ret = 0; |
| if (FD_ISSET(fd, &read_fds)) { |
| ret |= MBEDTLS_NET_POLL_READ; |
| } |
| if (FD_ISSET(fd, &write_fds)) { |
| ret |= MBEDTLS_NET_POLL_WRITE; |
| } |
| |
| return ret; |
| } |
| |
| /* |
| * Portable usleep helper |
| */ |
| void mbedtls_net_usleep(unsigned long usec) |
| { |
| #if defined(_WIN32) |
| Sleep((usec + 999) / 1000); |
| #else |
| struct timeval tv; |
| tv.tv_sec = usec / 1000000; |
| #if defined(__unix__) || defined(__unix) || \ |
| (defined(__APPLE__) && defined(__MACH__)) |
| tv.tv_usec = (suseconds_t) usec % 1000000; |
| #else |
| tv.tv_usec = usec % 1000000; |
| #endif |
| select(0, NULL, NULL, NULL, &tv); |
| #endif |
| } |
| |
| /* |
| * Read at most 'len' characters |
| */ |
| int mbedtls_net_recv(void *ctx, unsigned char *buf, size_t len) |
| { |
| int ret = MBEDTLS_ERR_ERROR_CORRUPTION_DETECTED; |
| int fd = ((mbedtls_net_context *) ctx)->fd; |
| |
| ret = check_fd(fd, 0); |
| if (ret != 0) { |
| return ret; |
| } |
| |
| ret = (int) read(fd, buf, len); |
| |
| if (ret < 0) { |
| if (net_would_block(ctx) != 0) { |
| return MBEDTLS_ERR_SSL_WANT_READ; |
| } |
| |
| #if (defined(_WIN32) || defined(_WIN32_WCE)) && !defined(EFIX64) && \ |
| !defined(EFI32) |
| if (WSAGetLastError() == WSAECONNRESET) { |
| return MBEDTLS_ERR_NET_CONN_RESET; |
| } |
| #else |
| if (errno == EPIPE || errno == ECONNRESET) { |
| return MBEDTLS_ERR_NET_CONN_RESET; |
| } |
| |
| if (errno == EINTR) { |
| return MBEDTLS_ERR_SSL_WANT_READ; |
| } |
| #endif |
| |
| return MBEDTLS_ERR_NET_RECV_FAILED; |
| } |
| |
| return ret; |
| } |
| |
| /* |
| * Read at most 'len' characters, blocking for at most 'timeout' ms |
| */ |
| int mbedtls_net_recv_timeout(void *ctx, unsigned char *buf, |
| size_t len, uint32_t timeout) |
| { |
| int ret = MBEDTLS_ERR_ERROR_CORRUPTION_DETECTED; |
| struct timeval tv; |
| fd_set read_fds; |
| int fd = ((mbedtls_net_context *) ctx)->fd; |
| |
| ret = check_fd(fd, 1); |
| if (ret != 0) { |
| return ret; |
| } |
| |
| FD_ZERO(&read_fds); |
| FD_SET((SOCKET) fd, &read_fds); |
| |
| tv.tv_sec = timeout / 1000; |
| tv.tv_usec = (timeout % 1000) * 1000; |
| |
| ret = select(fd + 1, &read_fds, NULL, NULL, timeout == 0 ? NULL : &tv); |
| |
| /* Zero fds ready means we timed out */ |
| if (ret == 0) { |
| return MBEDTLS_ERR_SSL_TIMEOUT; |
| } |
| |
| if (ret < 0) { |
| #if (defined(_WIN32) || defined(_WIN32_WCE)) && !defined(EFIX64) && \ |
| !defined(EFI32) |
| if (WSAGetLastError() == WSAEINTR) { |
| return MBEDTLS_ERR_SSL_WANT_READ; |
| } |
| #else |
| if (errno == EINTR) { |
| return MBEDTLS_ERR_SSL_WANT_READ; |
| } |
| #endif |
| |
| return MBEDTLS_ERR_NET_RECV_FAILED; |
| } |
| |
| /* This call will not block */ |
| return mbedtls_net_recv(ctx, buf, len); |
| } |
| |
| /* |
| * Write at most 'len' characters |
| */ |
| int mbedtls_net_send(void *ctx, const unsigned char *buf, size_t len) |
| { |
| int ret = MBEDTLS_ERR_ERROR_CORRUPTION_DETECTED; |
| int fd = ((mbedtls_net_context *) ctx)->fd; |
| |
| ret = check_fd(fd, 0); |
| if (ret != 0) { |
| return ret; |
| } |
| |
| ret = (int) write(fd, buf, len); |
| |
| if (ret < 0) { |
| if (net_would_block(ctx) != 0) { |
| return MBEDTLS_ERR_SSL_WANT_WRITE; |
| } |
| |
| #if (defined(_WIN32) || defined(_WIN32_WCE)) && !defined(EFIX64) && \ |
| !defined(EFI32) |
| if (WSAGetLastError() == WSAECONNRESET) { |
| return MBEDTLS_ERR_NET_CONN_RESET; |
| } |
| #else |
| if (errno == EPIPE || errno == ECONNRESET) { |
| return MBEDTLS_ERR_NET_CONN_RESET; |
| } |
| |
| if (errno == EINTR) { |
| return MBEDTLS_ERR_SSL_WANT_WRITE; |
| } |
| #endif |
| |
| return MBEDTLS_ERR_NET_SEND_FAILED; |
| } |
| |
| return ret; |
| } |
| |
| /* |
| * Close the connection |
| */ |
| void mbedtls_net_close(mbedtls_net_context *ctx) |
| { |
| if (ctx->fd == -1) { |
| return; |
| } |
| |
| close(ctx->fd); |
| |
| ctx->fd = -1; |
| } |
| |
| /* |
| * Gracefully close the connection |
| */ |
| void mbedtls_net_free(mbedtls_net_context *ctx) |
| { |
| if (ctx->fd == -1) { |
| return; |
| } |
| |
| shutdown(ctx->fd, 2); |
| close(ctx->fd); |
| |
| ctx->fd = -1; |
| } |
| |
| #endif /* MBEDTLS_NET_C */ |