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Diffstat (limited to 'lib/mbedtls-2.27.0/library/net_sockets.c')
-rw-r--r--lib/mbedtls-2.27.0/library/net_sockets.c713
1 files changed, 713 insertions, 0 deletions
diff --git a/lib/mbedtls-2.27.0/library/net_sockets.c b/lib/mbedtls-2.27.0/library/net_sockets.c
new file mode 100644
index 0000000..5fbe1f7
--- /dev/null
+++ b/lib/mbedtls-2.27.0/library/net_sockets.c
@@ -0,0 +1,713 @@
+/*
+ * TCP/IP or UDP/IP networking functions
+ *
+ * Copyright The Mbed TLS Contributors
+ * SPDX-License-Identifier: Apache-2.0
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License"); you may
+ * not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ * http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
+ * WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+/* Enable definition of getaddrinfo() even when compiling with -std=c99. Must
+ * be set before 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 config.h"
+#endif
+
+#if defined(MBEDTLS_PLATFORM_C)
+#include "mbedtls/platform.h"
+#else
+#include <stdlib.h>
+#endif
+
+#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 )
+
+#if !defined(_WIN32_WINNT)
+/* Enables getaddrinfo() & Co */
+#define _WIN32_WINNT 0x0501
+#endif
+
+#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 )
+
+#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>
+
+#include <time.h>
+
+#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 *ip_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;
+ *ip_len = sizeof( addr4->sin_addr.s_addr );
+
+ if( buf_size < *ip_len )
+ return( MBEDTLS_ERR_NET_BUFFER_TOO_SMALL );
+
+ memcpy( client_ip, &addr4->sin_addr.s_addr, *ip_len );
+ }
+ else
+ {
+ struct sockaddr_in6 *addr6 = (struct sockaddr_in6 *) &client_addr;
+ *ip_len = sizeof( addr6->sin6_addr.s6_addr );
+
+ if( buf_size < *ip_len )
+ return( MBEDTLS_ERR_NET_BUFFER_TOO_SMALL );
+
+ memcpy( client_ip, &addr6->sin6_addr.s6_addr, *ip_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( fd, &read_fds );
+ }
+
+ FD_ZERO( &write_fds );
+ if( rw & MBEDTLS_NET_POLL_WRITE )
+ {
+ rw &= ~MBEDTLS_NET_POLL_WRITE;
+ FD_SET( 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( 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 */
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