587 lines
15 KiB
C
587 lines
15 KiB
C
/*
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* TCP/IP or UDP/IP networking functions
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*
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* Copyright (C) 2006-2015, ARM Limited, All Rights Reserved
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* SPDX-License-Identifier: Apache-2.0
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*
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* Licensed under the Apache License, Version 2.0 (the "License"); you may
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* not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
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* WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*
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* This file is part of mbed TLS (https://tls.mbed.org)
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*/
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#if !defined(MBEDTLS_CONFIG_FILE)
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#include "mbedtls/config.h"
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#else
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#include MBEDTLS_CONFIG_FILE
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#endif
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#if defined(MBEDTLS_NET_C)
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#if !defined(unix) && !defined(__unix__) && !defined(__unix) && \
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!defined(__APPLE__) && !defined(_WIN32)
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#error "This module only works on Unix and Windows, see MBEDTLS_NET_C in config.h"
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#endif
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#if defined(MBEDTLS_PLATFORM_C)
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#include "mbedtls/platform.h"
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#else
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#include <stdlib.h>
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#endif
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#include "mbedtls/net_sockets.h"
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#include <string.h>
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#if (defined(_WIN32) || defined(_WIN32_WCE)) && !defined(EFIX64) && \
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!defined(EFI32)
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#ifdef _WIN32_WINNT
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#undef _WIN32_WINNT
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#endif
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/* Enables getaddrinfo() & Co */
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#define _WIN32_WINNT 0x0501
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#include <ws2tcpip.h>
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#include <winsock2.h>
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#include <windows.h>
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#if defined(_MSC_VER)
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#if defined(_WIN32_WCE)
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#pragma comment( lib, "ws2.lib" )
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#else
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#pragma comment( lib, "ws2_32.lib" )
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#endif
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#endif /* _MSC_VER */
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#define read(fd,buf,len) recv( fd, (char*)( buf ), (int)( len ), 0 )
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#define write(fd,buf,len) send( fd, (char*)( buf ), (int)( len ), 0 )
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#define close(fd) closesocket(fd)
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static int wsa_init_done = 0;
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#else /* ( _WIN32 || _WIN32_WCE ) && !EFIX64 && !EFI32 */
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#include <sys/types.h>
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#include <sys/socket.h>
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#include <netinet/in.h>
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#include <arpa/inet.h>
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#include <sys/time.h>
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#include <unistd.h>
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#include <signal.h>
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#include <fcntl.h>
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#include <netdb.h>
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#include <errno.h>
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#endif /* ( _WIN32 || _WIN32_WCE ) && !EFIX64 && !EFI32 */
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/* Some MS functions want int and MSVC warns if we pass size_t,
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* but the standard functions use socklen_t, so cast only for MSVC */
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#if defined(_MSC_VER)
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#define MSVC_INT_CAST (int)
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#else
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#define MSVC_INT_CAST
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#endif
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#include <stdio.h>
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#include <time.h>
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#include <stdint.h>
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/*
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* Prepare for using the sockets interface
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*/
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static int net_prepare( void )
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{
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#if ( defined(_WIN32) || defined(_WIN32_WCE) ) && !defined(EFIX64) && \
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!defined(EFI32)
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WSADATA wsaData;
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if( wsa_init_done == 0 )
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{
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if( WSAStartup( MAKEWORD(2,0), &wsaData ) != 0 )
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return( MBEDTLS_ERR_NET_SOCKET_FAILED );
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wsa_init_done = 1;
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}
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#else
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#if !defined(EFIX64) && !defined(EFI32)
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signal( SIGPIPE, SIG_IGN );
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#endif
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#endif
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return( 0 );
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}
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/*
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* Initialize a context
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*/
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void mbedtls_net_init( mbedtls_net_context *ctx )
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{
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ctx->fd = -1;
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}
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/*
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* Initiate a TCP connection with host:port and the given protocol
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*/
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int mbedtls_net_connect( mbedtls_net_context *ctx, const char *host,
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const char *port, int proto )
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{
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int ret;
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struct addrinfo hints, *addr_list, *cur;
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if( ( ret = net_prepare() ) != 0 )
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return( ret );
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/* Do name resolution with both IPv6 and IPv4 */
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memset( &hints, 0, sizeof( hints ) );
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hints.ai_family = AF_UNSPEC;
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hints.ai_socktype = proto == MBEDTLS_NET_PROTO_UDP ? SOCK_DGRAM : SOCK_STREAM;
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hints.ai_protocol = proto == MBEDTLS_NET_PROTO_UDP ? IPPROTO_UDP : IPPROTO_TCP;
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if( getaddrinfo( host, port, &hints, &addr_list ) != 0 )
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return( MBEDTLS_ERR_NET_UNKNOWN_HOST );
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/* Try the sockaddrs until a connection succeeds */
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ret = MBEDTLS_ERR_NET_UNKNOWN_HOST;
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for( cur = addr_list; cur != NULL; cur = cur->ai_next )
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{
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ctx->fd = (int) socket( cur->ai_family, cur->ai_socktype,
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cur->ai_protocol );
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if( ctx->fd < 0 )
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{
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ret = MBEDTLS_ERR_NET_SOCKET_FAILED;
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continue;
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}
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if( connect( ctx->fd, cur->ai_addr, MSVC_INT_CAST cur->ai_addrlen ) == 0 )
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{
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ret = 0;
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break;
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}
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close( ctx->fd );
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ret = MBEDTLS_ERR_NET_CONNECT_FAILED;
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}
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freeaddrinfo( addr_list );
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return( ret );
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}
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/*
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* Create a listening socket on bind_ip:port
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*/
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int mbedtls_net_bind( mbedtls_net_context *ctx, const char *bind_ip, const char *port, int proto )
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{
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int n, ret;
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struct addrinfo hints, *addr_list, *cur;
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if( ( ret = net_prepare() ) != 0 )
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return( ret );
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/* Bind to IPv6 and/or IPv4, but only in the desired protocol */
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memset( &hints, 0, sizeof( hints ) );
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hints.ai_family = AF_UNSPEC;
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hints.ai_socktype = proto == MBEDTLS_NET_PROTO_UDP ? SOCK_DGRAM : SOCK_STREAM;
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hints.ai_protocol = proto == MBEDTLS_NET_PROTO_UDP ? IPPROTO_UDP : IPPROTO_TCP;
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if( bind_ip == NULL )
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hints.ai_flags = AI_PASSIVE;
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if( getaddrinfo( bind_ip, port, &hints, &addr_list ) != 0 )
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return( MBEDTLS_ERR_NET_UNKNOWN_HOST );
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/* Try the sockaddrs until a binding succeeds */
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ret = MBEDTLS_ERR_NET_UNKNOWN_HOST;
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for( cur = addr_list; cur != NULL; cur = cur->ai_next )
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{
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ctx->fd = (int) socket( cur->ai_family, cur->ai_socktype,
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cur->ai_protocol );
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if( ctx->fd < 0 )
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{
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ret = MBEDTLS_ERR_NET_SOCKET_FAILED;
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continue;
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}
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n = 1;
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if( setsockopt( ctx->fd, SOL_SOCKET, SO_REUSEADDR,
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(const char *) &n, sizeof( n ) ) != 0 )
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{
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close( ctx->fd );
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ret = MBEDTLS_ERR_NET_SOCKET_FAILED;
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continue;
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}
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if( bind( ctx->fd, cur->ai_addr, MSVC_INT_CAST cur->ai_addrlen ) != 0 )
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{
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close( ctx->fd );
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ret = MBEDTLS_ERR_NET_BIND_FAILED;
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continue;
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}
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/* Listen only makes sense for TCP */
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if( proto == MBEDTLS_NET_PROTO_TCP )
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{
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if( listen( ctx->fd, MBEDTLS_NET_LISTEN_BACKLOG ) != 0 )
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{
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close( ctx->fd );
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ret = MBEDTLS_ERR_NET_LISTEN_FAILED;
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continue;
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}
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}
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/* Bind was successful */
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ret = 0;
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break;
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}
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freeaddrinfo( addr_list );
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return( ret );
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}
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#if ( defined(_WIN32) || defined(_WIN32_WCE) ) && !defined(EFIX64) && \
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!defined(EFI32)
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/*
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* Check if the requested operation would be blocking on a non-blocking socket
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* and thus 'failed' with a negative return value.
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*/
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static int net_would_block( const mbedtls_net_context *ctx )
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{
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((void) ctx);
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return( WSAGetLastError() == WSAEWOULDBLOCK );
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}
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#else
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/*
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* Check if the requested operation would be blocking on a non-blocking socket
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* and thus 'failed' with a negative return value.
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*
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* Note: on a blocking socket this function always returns 0!
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*/
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static int net_would_block( const mbedtls_net_context *ctx )
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{
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/*
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* Never return 'WOULD BLOCK' on a non-blocking socket
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*/
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if( ( fcntl( ctx->fd, F_GETFL ) & O_NONBLOCK ) != O_NONBLOCK )
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return( 0 );
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switch( errno )
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{
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#if defined EAGAIN
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case EAGAIN:
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#endif
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#if defined EWOULDBLOCK && EWOULDBLOCK != EAGAIN
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case EWOULDBLOCK:
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#endif
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return( 1 );
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}
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return( 0 );
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}
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#endif /* ( _WIN32 || _WIN32_WCE ) && !EFIX64 && !EFI32 */
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/*
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* Accept a connection from a remote client
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*/
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int mbedtls_net_accept( mbedtls_net_context *bind_ctx,
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mbedtls_net_context *client_ctx,
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void *client_ip, size_t buf_size, size_t *ip_len )
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{
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int ret;
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int type;
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struct sockaddr_storage client_addr;
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#if defined(__socklen_t_defined) || defined(_SOCKLEN_T) || \
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defined(_SOCKLEN_T_DECLARED) || defined(__DEFINED_socklen_t)
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socklen_t n = (socklen_t) sizeof( client_addr );
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socklen_t type_len = (socklen_t) sizeof( type );
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#else
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int n = (int) sizeof( client_addr );
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int type_len = (int) sizeof( type );
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#endif
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/* Is this a TCP or UDP socket? */
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if( getsockopt( bind_ctx->fd, SOL_SOCKET, SO_TYPE,
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(void *) &type, &type_len ) != 0 ||
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( type != SOCK_STREAM && type != SOCK_DGRAM ) )
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{
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return( MBEDTLS_ERR_NET_ACCEPT_FAILED );
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}
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if( type == SOCK_STREAM )
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{
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/* TCP: actual accept() */
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ret = client_ctx->fd = (int) accept( bind_ctx->fd,
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(struct sockaddr *) &client_addr, &n );
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}
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else
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{
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/* UDP: wait for a message, but keep it in the queue */
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char buf[1] = { 0 };
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ret = (int) recvfrom( bind_ctx->fd, buf, sizeof( buf ), MSG_PEEK,
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(struct sockaddr *) &client_addr, &n );
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#if defined(_WIN32)
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if( ret == SOCKET_ERROR &&
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WSAGetLastError() == WSAEMSGSIZE )
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{
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/* We know buf is too small, thanks, just peeking here */
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ret = 0;
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}
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#endif
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}
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if( ret < 0 )
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{
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if( net_would_block( bind_ctx ) != 0 )
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return( MBEDTLS_ERR_SSL_WANT_READ );
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return( MBEDTLS_ERR_NET_ACCEPT_FAILED );
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}
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/* UDP: hijack the listening socket to communicate with the client,
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* then bind a new socket to accept new connections */
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if( type != SOCK_STREAM )
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{
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struct sockaddr_storage local_addr;
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int one = 1;
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if( connect( bind_ctx->fd, (struct sockaddr *) &client_addr, n ) != 0 )
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return( MBEDTLS_ERR_NET_ACCEPT_FAILED );
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client_ctx->fd = bind_ctx->fd;
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bind_ctx->fd = -1; /* In case we exit early */
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n = sizeof( struct sockaddr_storage );
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if( getsockname( client_ctx->fd,
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(struct sockaddr *) &local_addr, &n ) != 0 ||
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( bind_ctx->fd = (int) socket( local_addr.ss_family,
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SOCK_DGRAM, IPPROTO_UDP ) ) < 0 ||
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setsockopt( bind_ctx->fd, SOL_SOCKET, SO_REUSEADDR,
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(const char *) &one, sizeof( one ) ) != 0 )
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{
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return( MBEDTLS_ERR_NET_SOCKET_FAILED );
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}
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if( bind( bind_ctx->fd, (struct sockaddr *) &local_addr, n ) != 0 )
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{
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return( MBEDTLS_ERR_NET_BIND_FAILED );
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}
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}
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if( client_ip != NULL )
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{
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if( client_addr.ss_family == AF_INET )
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{
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struct sockaddr_in *addr4 = (struct sockaddr_in *) &client_addr;
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*ip_len = sizeof( addr4->sin_addr.s_addr );
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if( buf_size < *ip_len )
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return( MBEDTLS_ERR_NET_BUFFER_TOO_SMALL );
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memcpy( client_ip, &addr4->sin_addr.s_addr, *ip_len );
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}
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else
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{
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struct sockaddr_in6 *addr6 = (struct sockaddr_in6 *) &client_addr;
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*ip_len = sizeof( addr6->sin6_addr.s6_addr );
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if( buf_size < *ip_len )
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return( MBEDTLS_ERR_NET_BUFFER_TOO_SMALL );
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memcpy( client_ip, &addr6->sin6_addr.s6_addr, *ip_len);
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}
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}
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return( 0 );
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}
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/*
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* Set the socket blocking or non-blocking
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*/
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int mbedtls_net_set_block( mbedtls_net_context *ctx )
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{
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#if ( defined(_WIN32) || defined(_WIN32_WCE) ) && !defined(EFIX64) && \
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!defined(EFI32)
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u_long n = 0;
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return( ioctlsocket( ctx->fd, FIONBIO, &n ) );
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#else
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return( fcntl( ctx->fd, F_SETFL, fcntl( ctx->fd, F_GETFL ) & ~O_NONBLOCK ) );
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#endif
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}
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int mbedtls_net_set_nonblock( mbedtls_net_context *ctx )
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{
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#if ( defined(_WIN32) || defined(_WIN32_WCE) ) && !defined(EFIX64) && \
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!defined(EFI32)
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u_long n = 1;
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return( ioctlsocket( ctx->fd, FIONBIO, &n ) );
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#else
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return( fcntl( ctx->fd, F_SETFL, fcntl( ctx->fd, F_GETFL ) | O_NONBLOCK ) );
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#endif
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}
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/*
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* Portable usleep helper
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*/
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void mbedtls_net_usleep( unsigned long usec )
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{
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#if defined(_WIN32)
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Sleep( ( usec + 999 ) / 1000 );
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#else
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struct timeval tv;
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tv.tv_sec = usec / 1000000;
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#if defined(__unix__) || defined(__unix) || \
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( defined(__APPLE__) && defined(__MACH__) )
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tv.tv_usec = (suseconds_t) usec % 1000000;
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#else
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tv.tv_usec = usec % 1000000;
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#endif
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select( 0, NULL, NULL, NULL, &tv );
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#endif
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}
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/*
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* Read at most 'len' characters
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*/
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int mbedtls_net_recv( void *ctx, unsigned char *buf, size_t len )
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{
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int ret;
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int fd = ((mbedtls_net_context *) ctx)->fd;
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if( fd < 0 )
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return( MBEDTLS_ERR_NET_INVALID_CONTEXT );
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ret = (int) read( fd, buf, len );
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if( ret < 0 )
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{
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if( net_would_block( ctx ) != 0 )
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return( MBEDTLS_ERR_SSL_WANT_READ );
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#if ( defined(_WIN32) || defined(_WIN32_WCE) ) && !defined(EFIX64) && \
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!defined(EFI32)
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if( WSAGetLastError() == WSAECONNRESET )
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return( MBEDTLS_ERR_NET_CONN_RESET );
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#else
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if( errno == EPIPE || errno == ECONNRESET )
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return( MBEDTLS_ERR_NET_CONN_RESET );
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if( errno == EINTR )
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return( MBEDTLS_ERR_SSL_WANT_READ );
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#endif
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return( MBEDTLS_ERR_NET_RECV_FAILED );
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}
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return( ret );
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}
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/*
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* Read at most 'len' characters, blocking for at most 'timeout' ms
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*/
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int mbedtls_net_recv_timeout( void *ctx, unsigned char *buf, size_t len,
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uint32_t timeout )
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{
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int ret;
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struct timeval tv;
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fd_set read_fds;
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int fd = ((mbedtls_net_context *) ctx)->fd;
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if( fd < 0 )
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return( MBEDTLS_ERR_NET_INVALID_CONTEXT );
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FD_ZERO( &read_fds );
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FD_SET( fd, &read_fds );
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tv.tv_sec = timeout / 1000;
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tv.tv_usec = ( timeout % 1000 ) * 1000;
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ret = select( fd + 1, &read_fds, NULL, NULL, timeout == 0 ? NULL : &tv );
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/* Zero fds ready means we timed out */
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if( ret == 0 )
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return( MBEDTLS_ERR_SSL_TIMEOUT );
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if( ret < 0 )
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{
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#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;
|
|
int fd = ((mbedtls_net_context *) ctx)->fd;
|
|
|
|
if( fd < 0 )
|
|
return( MBEDTLS_ERR_NET_INVALID_CONTEXT );
|
|
|
|
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 );
|
|
}
|
|
|
|
/*
|
|
* 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 */
|