626 lines
16 KiB
C
626 lines
16 KiB
C
/*
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* TCP/IP or UDP/IP networking functions
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*
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* Copyright (C) 2006-2014, Brainspark B.V.
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*
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* This file is part of PolarSSL (http://www.polarssl.org)
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* Lead Maintainer: Paul Bakker <polarssl_maintainer at polarssl.org>
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*
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* All rights reserved.
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License along
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* with this program; if not, write to the Free Software Foundation, Inc.,
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* 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
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*/
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#if !defined(POLARSSL_CONFIG_FILE)
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#include "polarssl/config.h"
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#else
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#include POLARSSL_CONFIG_FILE
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#endif
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#if defined(POLARSSL_NET_C)
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#include "polarssl/net.h"
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#if (defined(_WIN32) || defined(_WIN32_WCE)) && !defined(EFIX64) && \
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!defined(EFI32)
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#if defined(POLARSSL_HAVE_IPV6)
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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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#endif
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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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#if defined(POLARSSL_HAVE_TIME)
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#include <sys/time.h>
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#endif
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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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#if defined(__FreeBSD__) || defined(__OpenBSD__) || defined(__NetBSD__) || \
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defined(__DragonFly__)
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#include <sys/endian.h>
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#elif defined(__APPLE__) || defined(HAVE_MACHINE_ENDIAN_H) || \
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defined(EFIX64) || defined(EFI32)
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#include <machine/endian.h>
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#elif defined(sun)
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#include <sys/isa_defs.h>
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#elif defined(_AIX) || defined(HAVE_ARPA_NAMESER_COMPAT_H)
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#include <arpa/nameser_compat.h>
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#else
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#include <endian.h>
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#endif
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#endif /* ( _WIN32 || _WIN32_WCE ) && !EFIX64 && !EFI32 */
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#include <stdlib.h>
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#include <stdio.h>
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#if defined(_MSC_VER) && !defined snprintf && !defined(EFIX64) && \
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!defined(EFI32)
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#define snprintf _snprintf
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#endif
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#if defined(POLARSSL_HAVE_TIME)
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#include <time.h>
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#endif
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#if defined(_MSC_VER) && !defined(EFIX64) && !defined(EFI32)
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#include <basetsd.h>
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typedef UINT32 uint32_t;
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#else
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#include <inttypes.h>
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#endif
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/*
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* htons() is not always available.
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* By default go for LITTLE_ENDIAN variant. Otherwise hope for _BYTE_ORDER and
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* __BIG_ENDIAN to help determine endianness.
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*/
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#if defined(__BYTE_ORDER) && defined(__BIG_ENDIAN) && \
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__BYTE_ORDER == __BIG_ENDIAN
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#define POLARSSL_HTONS(n) (n)
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#define POLARSSL_HTONL(n) (n)
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#else
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#define POLARSSL_HTONS(n) ((((unsigned short)(n) & 0xFF ) << 8 ) | \
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(((unsigned short)(n) & 0xFF00 ) >> 8 ))
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#define POLARSSL_HTONL(n) ((((unsigned long )(n) & 0xFF ) << 24) | \
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(((unsigned long )(n) & 0xFF00 ) << 8 ) | \
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(((unsigned long )(n) & 0xFF0000 ) >> 8 ) | \
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(((unsigned long )(n) & 0xFF000000) >> 24))
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#endif
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unsigned short net_htons( unsigned short n );
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unsigned long net_htonl( unsigned long n );
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#define net_htons(n) POLARSSL_HTONS(n)
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#define net_htonl(n) POLARSSL_HTONL(n)
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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( POLARSSL_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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* Initiate a TCP connection with host:port and the given protocol
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*/
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int net_connect( int *fd, const char *host, int port, int proto )
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{
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#if defined(POLARSSL_HAVE_IPV6)
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int ret;
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struct addrinfo hints, *addr_list, *cur;
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char port_str[6];
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if( ( ret = net_prepare() ) != 0 )
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return( ret );
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/* getaddrinfo expects port as a string */
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memset( port_str, 0, sizeof( port_str ) );
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snprintf( port_str, sizeof( port_str ), "%d", port );
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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 == NET_PROTO_UDP ? SOCK_DGRAM : SOCK_STREAM;
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hints.ai_protocol = proto == NET_PROTO_UDP ? IPPROTO_UDP : IPPROTO_TCP;
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if( getaddrinfo( host, port_str, &hints, &addr_list ) != 0 )
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return( POLARSSL_ERR_NET_UNKNOWN_HOST );
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/* Try the sockaddrs until a connection succeeds */
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ret = POLARSSL_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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*fd = (int) socket( cur->ai_family, cur->ai_socktype,
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cur->ai_protocol );
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if( *fd < 0 )
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{
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ret = POLARSSL_ERR_NET_SOCKET_FAILED;
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continue;
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}
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if( connect( *fd, cur->ai_addr, 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( *fd );
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ret = POLARSSL_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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#else
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/* Legacy IPv4-only version */
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int ret;
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struct sockaddr_in server_addr;
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struct hostent *server_host;
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if( ( ret = net_prepare() ) != 0 )
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return( ret );
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if( ( server_host = gethostbyname( host ) ) == NULL )
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return( POLARSSL_ERR_NET_UNKNOWN_HOST );
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if( ( *fd = (int) socket( AF_INET,
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proto == NET_PROTO_UDP ? SOCK_DGRAM : SOCK_STREAM,
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proto == NET_PROTO_UDP ? IPPROTO_UDP : IPPROTO_TCP ) ) < 0 )
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return( POLARSSL_ERR_NET_SOCKET_FAILED );
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memcpy( (void *) &server_addr.sin_addr,
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(void *) server_host->h_addr,
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server_host->h_length );
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server_addr.sin_family = AF_INET;
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server_addr.sin_port = net_htons( port );
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if( connect( *fd, (struct sockaddr *) &server_addr,
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sizeof( server_addr ) ) < 0 )
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{
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close( *fd );
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return( POLARSSL_ERR_NET_CONNECT_FAILED );
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}
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return( 0 );
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#endif /* POLARSSL_HAVE_IPV6 */
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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 net_bind( int *fd, const char *bind_ip, int port, int proto )
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{
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#if defined(POLARSSL_HAVE_IPV6)
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int n, ret;
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struct addrinfo hints, *addr_list, *cur;
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char port_str[6];
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if( ( ret = net_prepare() ) != 0 )
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return( ret );
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/* getaddrinfo expects port as a string */
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memset( port_str, 0, sizeof( port_str ) );
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snprintf( port_str, sizeof( port_str ), "%d", port );
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/* Bind to IPv6 and/or IPv4, but only in TCP */
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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 == NET_PROTO_UDP ? SOCK_DGRAM : SOCK_STREAM;
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hints.ai_protocol = proto == 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_str, &hints, &addr_list ) != 0 )
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return( POLARSSL_ERR_NET_UNKNOWN_HOST );
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/* Try the sockaddrs until a binding succeeds */
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ret = POLARSSL_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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*fd = (int) socket( cur->ai_family, cur->ai_socktype,
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cur->ai_protocol );
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if( *fd < 0 )
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{
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ret = POLARSSL_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( *fd, SOL_SOCKET, SO_REUSEADDR,
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(const char *) &n, sizeof( n ) ) != 0 )
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{
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close( *fd );
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ret = POLARSSL_ERR_NET_SOCKET_FAILED;
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continue;
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}
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if( bind( *fd, cur->ai_addr, cur->ai_addrlen ) != 0 )
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{
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close( *fd );
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ret = POLARSSL_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 == NET_PROTO_TCP )
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{
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if( listen( *fd, POLARSSL_NET_LISTEN_BACKLOG ) != 0 )
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{
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close( *fd );
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ret = POLARSSL_ERR_NET_LISTEN_FAILED;
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continue;
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}
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}
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/* I we ever get there, it's a success */
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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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#else
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/* Legacy IPv4-only version */
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int ret, n, c[4];
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struct sockaddr_in server_addr;
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if( ( ret = net_prepare() ) != 0 )
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return( ret );
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if( ( *fd = (int) socket( AF_INET,
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proto == NET_PROTO_UDP ? SOCK_DGRAM : SOCK_STREAM,
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proto == NET_PROTO_UDP ? IPPROTO_UDP : IPPROTO_TCP ) ) < 0 )
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return( POLARSSL_ERR_NET_SOCKET_FAILED );
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n = 1;
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setsockopt( *fd, SOL_SOCKET, SO_REUSEADDR,
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(const char *) &n, sizeof( n ) );
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server_addr.sin_addr.s_addr = net_htonl( INADDR_ANY );
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server_addr.sin_family = AF_INET;
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server_addr.sin_port = net_htons( port );
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if( bind_ip != NULL )
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{
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memset( c, 0, sizeof( c ) );
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sscanf( bind_ip, "%d.%d.%d.%d", &c[0], &c[1], &c[2], &c[3] );
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for( n = 0; n < 4; n++ )
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if( c[n] < 0 || c[n] > 255 )
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break;
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if( n == 4 )
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server_addr.sin_addr.s_addr = net_htonl(
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( (uint32_t) c[0] << 24 ) |
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( (uint32_t) c[1] << 16 ) |
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( (uint32_t) c[2] << 8 ) |
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( (uint32_t) c[3] ) );
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}
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if( bind( *fd, (struct sockaddr *) &server_addr,
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sizeof( server_addr ) ) < 0 )
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{
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close( *fd );
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return( POLARSSL_ERR_NET_BIND_FAILED );
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}
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/* Listen only makes sense for TCP */
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if( proto == NET_PROTO_TCP )
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{
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if( listen( *fd, POLARSSL_NET_LISTEN_BACKLOG ) != 0 )
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{
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close( *fd );
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return( POLARSSL_ERR_NET_LISTEN_FAILED );
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}
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}
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return( 0 );
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#endif /* POLARSSL_HAVE_IPV6 */
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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( int fd )
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{
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((void) fd);
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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( int fd )
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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( 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 net_accept( int bind_fd, int *client_fd, void *client_ip )
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{
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int ret;
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int type;
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#if defined(POLARSSL_HAVE_IPV6)
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struct sockaddr_storage client_addr;
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#else
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struct sockaddr_in client_addr;
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#endif
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#if defined(__socklen_t_defined) || defined(_SOCKLEN_T) || \
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defined(_SOCKLEN_T_DECLARED)
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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_fd, SOL_SOCKET, SO_TYPE, &type, &type_len ) != 0 ||
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( type != SOCK_STREAM && type != SOCK_DGRAM ) )
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{
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return( POLARSSL_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_fd = (int) accept( bind_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 = recvfrom( bind_fd, buf, 0, MSG_PEEK,
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(struct sockaddr *) &client_addr, &n );
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}
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if( ret < 0 )
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{
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if( net_would_block( bind_fd ) != 0 )
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return( POLARSSL_ERR_NET_WANT_READ );
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return( POLARSSL_ERR_NET_ACCEPT_FAILED );
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}
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/* UDP: hijack the listening socket for communicating with the client */
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if( type != SOCK_STREAM )
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{
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if( connect( bind_fd, (struct sockaddr *) &client_addr, n ) != 0 )
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return( POLARSSL_ERR_NET_ACCEPT_FAILED );
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*client_fd = bind_fd;
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}
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if( client_ip != NULL )
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{
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#if defined(POLARSSL_HAVE_IPV6)
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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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memcpy( client_ip, &addr4->sin_addr.s_addr,
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sizeof( addr4->sin_addr.s_addr ) );
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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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memcpy( client_ip, &addr6->sin6_addr.s6_addr,
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sizeof( addr6->sin6_addr.s6_addr ) );
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}
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#else
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memcpy( client_ip, &client_addr.sin_addr.s_addr,
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sizeof( client_addr.sin_addr.s_addr ) );
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#endif /* POLARSSL_HAVE_IPV6 */
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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 net_set_block( int fd )
|
|
{
|
|
#if ( defined(_WIN32) || defined(_WIN32_WCE) ) && !defined(EFIX64) && \
|
|
!defined(EFI32)
|
|
u_long n = 0;
|
|
return( ioctlsocket( fd, FIONBIO, &n ) );
|
|
#else
|
|
return( fcntl( fd, F_SETFL, fcntl( fd, F_GETFL ) & ~O_NONBLOCK ) );
|
|
#endif
|
|
}
|
|
|
|
int net_set_nonblock( int fd )
|
|
{
|
|
#if ( defined(_WIN32) || defined(_WIN32_WCE) ) && !defined(EFIX64) && \
|
|
!defined(EFI32)
|
|
u_long n = 1;
|
|
return( ioctlsocket( fd, FIONBIO, &n ) );
|
|
#else
|
|
return( fcntl( fd, F_SETFL, fcntl( fd, F_GETFL ) | O_NONBLOCK ) );
|
|
#endif
|
|
}
|
|
|
|
#if defined(POLARSSL_HAVE_TIME)
|
|
/*
|
|
* Portable usleep helper
|
|
*/
|
|
void net_usleep( unsigned long usec )
|
|
{
|
|
struct timeval tv;
|
|
tv.tv_sec = 0;
|
|
#if !defined(_WIN32) && ( defined(__unix__) || defined(__unix) || \
|
|
( defined(__APPLE__) && defined(__MACH__) ) )
|
|
tv.tv_usec = (suseconds_t) usec;
|
|
#else
|
|
tv.tv_usec = usec;
|
|
#endif
|
|
select( 0, NULL, NULL, NULL, &tv );
|
|
}
|
|
#endif /* POLARSSL_HAVE_TIME */
|
|
|
|
/*
|
|
* Read at most 'len' characters
|
|
*/
|
|
int net_recv( void *ctx, unsigned char *buf, size_t len )
|
|
{
|
|
int fd = *((int *) ctx);
|
|
int ret = (int) read( fd, buf, len );
|
|
|
|
if( ret < 0 )
|
|
{
|
|
if( net_would_block( fd ) != 0 )
|
|
return( POLARSSL_ERR_NET_WANT_READ );
|
|
|
|
#if ( defined(_WIN32) || defined(_WIN32_WCE) ) && !defined(EFIX64) && \
|
|
!defined(EFI32)
|
|
if( WSAGetLastError() == WSAECONNRESET )
|
|
return( POLARSSL_ERR_NET_CONN_RESET );
|
|
#else
|
|
if( errno == EPIPE || errno == ECONNRESET )
|
|
return( POLARSSL_ERR_NET_CONN_RESET );
|
|
|
|
if( errno == EINTR )
|
|
return( POLARSSL_ERR_NET_WANT_READ );
|
|
#endif
|
|
|
|
return( POLARSSL_ERR_NET_RECV_FAILED );
|
|
}
|
|
|
|
return( ret );
|
|
}
|
|
|
|
/*
|
|
* Write at most 'len' characters
|
|
*/
|
|
int net_send( void *ctx, const unsigned char *buf, size_t len )
|
|
{
|
|
int fd = *((int *) ctx);
|
|
int ret = (int) write( fd, buf, len );
|
|
|
|
if( ret < 0 )
|
|
{
|
|
if( net_would_block( fd ) != 0 )
|
|
return( POLARSSL_ERR_NET_WANT_WRITE );
|
|
|
|
#if ( defined(_WIN32) || defined(_WIN32_WCE) ) && !defined(EFIX64) && \
|
|
!defined(EFI32)
|
|
if( WSAGetLastError() == WSAECONNRESET )
|
|
return( POLARSSL_ERR_NET_CONN_RESET );
|
|
#else
|
|
if( errno == EPIPE || errno == ECONNRESET )
|
|
return( POLARSSL_ERR_NET_CONN_RESET );
|
|
|
|
if( errno == EINTR )
|
|
return( POLARSSL_ERR_NET_WANT_WRITE );
|
|
#endif
|
|
|
|
return( POLARSSL_ERR_NET_SEND_FAILED );
|
|
}
|
|
|
|
return( ret );
|
|
}
|
|
|
|
/*
|
|
* Gracefully close the connection
|
|
*/
|
|
void net_close( int fd )
|
|
{
|
|
shutdown( fd, 2 );
|
|
close( fd );
|
|
}
|
|
|
|
#endif /* POLARSSL_NET_C */
|