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mbedtls/library/net.c
Paul Bakker 80025417eb net_is_block() renamed to net_would_block() and corrected behaviour on 
non-blocking sockets

net_would_block() now does not return 1 if the socket is blocking.
2014-01-23 21:00:57 +01:00

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/*
* TCP networking functions
*
* Copyright (C) 2006-2013, Brainspark B.V.
*
* This file is part of PolarSSL (http://www.polarssl.org)
* Lead Maintainer: Paul Bakker <polarssl_maintainer at polarssl.org>
*
* All rights reserved.
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License along
* with this program; if not, write to the Free Software Foundation, Inc.,
* 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
*/
#include "polarssl/config.h"
#if defined(POLARSSL_NET_C)
#include "polarssl/net.h"
#if (defined(_WIN32) || defined(_WIN32_WCE)) && !defined(EFIX64) && \
!defined(EFI32)
#if defined(POLARSSL_HAVE_IPV6)
#define _WIN32_WINNT 0x0501
#include <ws2tcpip.h>
#endif
#include <winsock2.h>
#include <windows.h>
#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
#include <sys/types.h>
#include <sys/socket.h>
#include <netinet/in.h>
#include <arpa/inet.h>
#if defined(POLARSSL_HAVE_TIME)
#include <sys/time.h>
#endif
#include <unistd.h>
#include <signal.h>
#include <fcntl.h>
#include <netdb.h>
#include <errno.h>
#if defined(__FreeBSD__) || defined(__OpenBSD__) || defined(__NetBSD__) || \
defined(__DragonflyBSD__)
#include <sys/endian.h>
#elif defined(__APPLE__) || defined(HAVE_MACHINE_ENDIAN_H) || \
defined(EFIX64) || defined(EFI32)
#include <machine/endian.h>
#elif defined(sun)
#include <sys/isa_defs.h>
#elif defined(_AIX) || defined(HAVE_ARPA_NAMESER_COMPAT_H)
#include <arpa/nameser_compat.h>
#else
#include <endian.h>
#endif
#endif
#include <stdlib.h>
#include <stdio.h>
#if defined(_MSC_VER) && !defined snprintf && !defined(EFIX64) && \
!defined(EFI32)
#define snprintf _snprintf
#endif
#if defined(POLARSSL_HAVE_TIME)
#include <time.h>
#endif
#if defined(_MSC_VER) && !defined(EFIX64) && !defined(EFI32)
#include <basetsd.h>
typedef UINT32 uint32_t;
#else
#include <inttypes.h>
#endif
/*
* htons() is not always available.
* By default go for LITTLE_ENDIAN variant. Otherwise hope for _BYTE_ORDER and __BIG_ENDIAN
* to help determine endianness.
*/
#if defined(__BYTE_ORDER) && defined(__BIG_ENDIAN) && __BYTE_ORDER == __BIG_ENDIAN
#define POLARSSL_HTONS(n) (n)
#define POLARSSL_HTONL(n) (n)
#else
#define POLARSSL_HTONS(n) ((((unsigned short)(n) & 0xFF ) << 8 ) | \
(((unsigned short)(n) & 0xFF00 ) >> 8 ))
#define POLARSSL_HTONL(n) ((((unsigned long )(n) & 0xFF ) << 24) | \
(((unsigned long )(n) & 0xFF00 ) << 8 ) | \
(((unsigned long )(n) & 0xFF0000 ) >> 8 ) | \
(((unsigned long )(n) & 0xFF000000) >> 24))
#endif
unsigned short net_htons(unsigned short n);
unsigned long net_htonl(unsigned long n);
#define net_htons(n) POLARSSL_HTONS(n)
#define net_htonl(n) POLARSSL_HTONL(n)
/*
* 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 ) == SOCKET_ERROR )
return( POLARSSL_ERR_NET_SOCKET_FAILED );
wsa_init_done = 1;
}
#else
#if !defined(EFIX64) && !defined(EFI32)
signal( SIGPIPE, SIG_IGN );
#endif
#endif
return( 0 );
}
/*
* Initiate a TCP connection with host:port
*/
int net_connect( int *fd, const char *host, int port )
{
#if defined(POLARSSL_HAVE_IPV6)
int ret;
struct addrinfo hints, *addr_list, *cur;
char port_str[6];
if( ( ret = net_prepare() ) != 0 )
return( ret );
/* getaddrinfo expects port as a string */
memset( port_str, 0, sizeof( port_str ) );
snprintf( port_str, sizeof( port_str ), "%d", port );
/* Do name resolution with both IPv6 and IPv4, but only TCP */
memset( &hints, 0, sizeof( hints ) );
hints.ai_family = AF_UNSPEC;
hints.ai_socktype = SOCK_STREAM;
hints.ai_protocol = IPPROTO_TCP;
if( getaddrinfo( host, port_str, &hints, &addr_list ) != 0 )
return( POLARSSL_ERR_NET_UNKNOWN_HOST );
/* Try the sockaddrs until a connection succeeds */
ret = POLARSSL_ERR_NET_UNKNOWN_HOST;
for( cur = addr_list; cur != NULL; cur = cur->ai_next )
{
*fd = (int) socket( cur->ai_family, cur->ai_socktype,
cur->ai_protocol );
if( *fd < 0 )
{
ret = POLARSSL_ERR_NET_SOCKET_FAILED;
continue;
}
if( connect( *fd, cur->ai_addr, cur->ai_addrlen ) == 0 )
{
ret = 0;
break;
}
close( *fd );
ret = POLARSSL_ERR_NET_CONNECT_FAILED;
}
freeaddrinfo( addr_list );
return( ret );
#else
/* Legacy IPv4-only version */
int ret;
struct sockaddr_in server_addr;
struct hostent *server_host;
if( ( ret = net_prepare() ) != 0 )
return( ret );
if( ( server_host = gethostbyname( host ) ) == NULL )
return( POLARSSL_ERR_NET_UNKNOWN_HOST );
if( ( *fd = (int) socket( AF_INET, SOCK_STREAM, IPPROTO_IP ) ) < 0 )
return( POLARSSL_ERR_NET_SOCKET_FAILED );
memcpy( (void *) &server_addr.sin_addr,
(void *) server_host->h_addr,
server_host->h_length );
server_addr.sin_family = AF_INET;
server_addr.sin_port = net_htons( port );
if( connect( *fd, (struct sockaddr *) &server_addr,
sizeof( server_addr ) ) < 0 )
{
close( *fd );
return( POLARSSL_ERR_NET_CONNECT_FAILED );
}
return( 0 );
#endif /* POLARSSL_HAVE_IPV6 */
}
/*
* Create a listening socket on bind_ip:port
*/
int net_bind( int *fd, const char *bind_ip, int port )
{
#if defined(POLARSSL_HAVE_IPV6)
int n, ret;
struct addrinfo hints, *addr_list, *cur;
char port_str[6];
if( ( ret = net_prepare() ) != 0 )
return( ret );
/* getaddrinfo expects port as a string */
memset( port_str, 0, sizeof( port_str ) );
snprintf( port_str, sizeof( port_str ), "%d", port );
/* Bind to IPv6 and/or IPv4, but only in TCP */
memset( &hints, 0, sizeof( hints ) );
hints.ai_family = AF_UNSPEC;
hints.ai_socktype = SOCK_STREAM;
hints.ai_protocol = IPPROTO_TCP;
if( bind_ip == NULL )
hints.ai_flags = AI_PASSIVE;
if( getaddrinfo( bind_ip, port_str, &hints, &addr_list ) != 0 )
return( POLARSSL_ERR_NET_UNKNOWN_HOST );
/* Try the sockaddrs until a binding succeeds */
ret = POLARSSL_ERR_NET_UNKNOWN_HOST;
for( cur = addr_list; cur != NULL; cur = cur->ai_next )
{
*fd = (int) socket( cur->ai_family, cur->ai_socktype,
cur->ai_protocol );
if( *fd < 0 )
{
ret = POLARSSL_ERR_NET_SOCKET_FAILED;
continue;
}
n = 1;
setsockopt( *fd, SOL_SOCKET, SO_REUSEADDR,
(const char *) &n, sizeof( n ) );
if( bind( *fd, cur->ai_addr, cur->ai_addrlen ) != 0 )
{
close( *fd );
ret = POLARSSL_ERR_NET_BIND_FAILED;
continue;
}
if( listen( *fd, POLARSSL_NET_LISTEN_BACKLOG ) != 0 )
{
close( *fd );
ret = POLARSSL_ERR_NET_LISTEN_FAILED;
continue;
}
/* I we ever get there, it's a success */
ret = 0;
break;
}
freeaddrinfo( addr_list );
return( ret );
#else
/* Legacy IPv4-only version */
int ret, n, c[4];
struct sockaddr_in server_addr;
if( ( ret = net_prepare() ) != 0 )
return( ret );
if( ( *fd = (int) socket( AF_INET, SOCK_STREAM, IPPROTO_IP ) ) < 0 )
return( POLARSSL_ERR_NET_SOCKET_FAILED );
n = 1;
setsockopt( *fd, SOL_SOCKET, SO_REUSEADDR,
(const char *) &n, sizeof( n ) );
server_addr.sin_addr.s_addr = net_htonl( INADDR_ANY );
server_addr.sin_family = AF_INET;
server_addr.sin_port = net_htons( port );
if( bind_ip != NULL )
{
memset( c, 0, sizeof( c ) );
sscanf( bind_ip, "%d.%d.%d.%d", &c[0], &c[1], &c[2], &c[3] );
for( n = 0; n < 4; n++ )
if( c[n] < 0 || c[n] > 255 )
break;
if( n == 4 )
server_addr.sin_addr.s_addr = net_htonl(
( (uint32_t) c[0] << 24 ) |
( (uint32_t) c[1] << 16 ) |
( (uint32_t) c[2] << 8 ) |
( (uint32_t) c[3] ) );
}
if( bind( *fd, (struct sockaddr *) &server_addr,
sizeof( server_addr ) ) < 0 )
{
close( *fd );
return( POLARSSL_ERR_NET_BIND_FAILED );
}
if( listen( *fd, POLARSSL_NET_LISTEN_BACKLOG ) != 0 )
{
close( *fd );
return( POLARSSL_ERR_NET_LISTEN_FAILED );
}
return( 0 );
#endif /* POLARSSL_HAVE_IPV6 */
}
#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( int fd )
{
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( int fd )
{
/*
* Never return 'WOULD BLOCK' on a non-blocking socket
*/
if( ( fcntl( fd, F_GETFL ) & O_NONBLOCK ) != O_NONBLOCK )
return( 0 );
switch( errno )
{
#if defined EAGAIN
case EAGAIN:
#endif
#if defined EWOULDBLOCK && EWOULDBLOCK != EAGAIN
case EWOULDBLOCK:
#endif
return( 1 );
}
return( 0 );
}
#endif
/*
* Accept a connection from a remote client
*/
int net_accept( int bind_fd, int *client_fd, void *client_ip )
{
#if defined(POLARSSL_HAVE_IPV6)
struct sockaddr_storage client_addr;
#else
struct sockaddr_in client_addr;
#endif
#if defined(__socklen_t_defined) || defined(_SOCKLEN_T) || \
defined(_SOCKLEN_T_DECLARED)
socklen_t n = (socklen_t) sizeof( client_addr );
#else
int n = (int) sizeof( client_addr );
#endif
*client_fd = (int) accept( bind_fd, (struct sockaddr *)
&client_addr, &n );
if( *client_fd < 0 )
{
if( net_would_block( *client_fd ) != 0 )
return( POLARSSL_ERR_NET_WANT_READ );
return( POLARSSL_ERR_NET_ACCEPT_FAILED );
}
if( client_ip != NULL )
{
#if defined(POLARSSL_HAVE_IPV6)
if( client_addr.ss_family == AF_INET )
{
struct sockaddr_in *addr4 = (struct sockaddr_in *) &client_addr;
memcpy( client_ip, &addr4->sin_addr.s_addr,
sizeof( addr4->sin_addr.s_addr ) );
}
else
{
struct sockaddr_in6 *addr6 = (struct sockaddr_in6 *) &client_addr;
memcpy( client_ip, &addr6->sin6_addr.s6_addr,
sizeof( addr6->sin6_addr.s6_addr ) );
}
#else
memcpy( client_ip, &client_addr.sin_addr.s_addr,
sizeof( client_addr.sin_addr.s_addr ) );
#endif /* POLARSSL_HAVE_IPV6 */
}
return( 0 );
}
/*
* Set the socket blocking or non-blocking
*/
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;
tv.tv_usec = usec;
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 = 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 = 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
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