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/**
* Portions COPYRIGHT 2016 STMicroelectronics
* Copyright (C) 2006-2015, ARM Limited, All Rights Reserved
*
******************************************************************************
* @file net_sockets.c
* @author MCD Application Team
* @brief TCP/IP or UDP/IP networking functions implementation based on LwIP API
see the file "mbedTLS/library/net_socket_template.c" for the standard
implementation
******************************************************************************
* @attention
*
* Copyright (c) 2017 STMicroelectronics.
* All rights reserved.
*
* This software is licensed under terms that can be found in the LICENSE file
* in the root directory of this software component.
* If no LICENSE file comes with this software, it is provided AS-IS.
*
******************************************************************************
*/
#if !defined(MBEDTLS_CONFIG_FILE)
#include "mbedtls/config.h"
#else
#include MBEDTLS_CONFIG_FILE
#endif
#include <string.h>
#include <stdint.h>
#if defined(MBEDTLS_NET_C)
#if defined(MBEDTLS_PLATFORM_C)
#include "mbedtls/platform.h"
#else
#include <stdlib.h>
#endif
#include "mbedtls/net_sockets.h"
#include "lwip/dhcp.h"
#include "lwip/tcpip.h"
#include "lwip/ip_addr.h"
#include "lwip/netdb.h"
#include "lwip/sockets.h"
#include "netif/ethernet.h"
#include "ethernetif.h"
#include "stm32f4xx_hal.h"
#include "main.h"
static struct netif netif;
static int initialized = 0;
struct sockaddr_storage client_addr;
static int net_would_block( const mbedtls_net_context *ctx );
/*
* Initialize LwIP stack and get a dynamic IP address.
*/
void mbedtls_net_init( mbedtls_net_context *ctx )
{
ip4_addr_t addr;
ip4_addr_t netmask;
ip4_addr_t gw;
uint32_t start;
ctx->fd = -1;
if (initialized != 0)
return;
tcpip_init(NULL, NULL);
/* IP default settings, to be overridden by DHCP */
IP4_ADDR(&addr, IP_ADDR0, IP_ADDR1, IP_ADDR2, IP_ADDR3);
IP4_ADDR(&gw, GW_ADDR0, GW_ADDR1, GW_ADDR2, GW_ADDR3);
IP4_ADDR(&netmask, MASK_ADDR0, MASK_ADDR1, MASK_ADDR2, MASK_ADDR3);
/* add the network interface */
netif_add(&netif, &addr, &netmask, &gw, NULL, ðernetif_init, ðernet_input);
/* register the default network interface. */
netif_set_default(&netif);
if (netif_is_link_up(&netif))
{
netif_set_up(&netif);
}
else
{
netif_set_down(&netif);
}
#ifdef USE_DHCP
dhcp_start(&netif);
#endif
osDelay(500);
start = HAL_GetTick();
while((netif.ip_addr.addr == 0) && (HAL_GetTick() - start < 10000))
{
}
if (netif.ip_addr.addr == 0)
{
printf(" Failed to get ip address! Please check your network configuration.\n");
Error_Handler();
}
else
{
printf("\nIpAdress = %lu.%lu.%lu.%lu\n", (netif.ip_addr.addr & 0xff), ((netif.ip_addr.addr >> 8) & 0xff)
, ((netif.ip_addr.addr >> 16) & 0xff), ((netif.ip_addr.addr >> 24)& 0xff));
initialized = 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;
struct addrinfo hints;
struct addrinfo *list;
struct addrinfo *current;
/* 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, &list) != 0)
return MBEDTLS_ERR_NET_UNKNOWN_HOST;
/* Try the sockaddrs until a connection succeeds */
ret = MBEDTLS_ERR_NET_UNKNOWN_HOST;
for( current = list; current != NULL; current = current->ai_next)
{
ctx->fd = (int) socket(current->ai_family, current->ai_socktype, current->ai_protocol);
if(ctx->fd < 0)
{
ret = MBEDTLS_ERR_NET_SOCKET_FAILED;
continue;
}
if(connect(ctx->fd, current->ai_addr, (uint32_t)current->ai_addrlen) == 0)
{
ret = 0;
break;
}
close( ctx->fd );
ret = MBEDTLS_ERR_NET_CONNECT_FAILED;
}
freeaddrinfo(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;
/* 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, (socklen_t)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;
}
}
/* I we ever get there, it's a success */
ret = 0;
break;
}
freeaddrinfo( addr_list );
return ret;
}
/*
* 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;
int type;
#if defined(__socklen_t_defined) || defined(_SOCKLEN_T) || \
defined(_SOCKLEN_T_DECLARED) || defined(__DEFINED_socklen_t)
#error _SOCKLEN_T
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, (u32_t *)(&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, (u32_t *)(&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, (u32_t *)(&n) );
}
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, (u32_t*)(&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 )
{
#if LWIP_IPV4
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 );
#endif
}
else
{
#if LWIP_IPV6
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);
#endif
}
}
return( 0 );
}
/*
* Set the socket blocking or non-blocking
*/
int mbedtls_net_set_block( mbedtls_net_context *ctx )
{
mbedtls_printf ("%s() NOT IMPLEMENTED!!\n", __FUNCTION__);
return 0;
}
int mbedtls_net_set_nonblock( mbedtls_net_context *ctx )
{
mbedtls_printf ("%s() NOT IMPLEMENTED!!\n", __FUNCTION__);
return 0;
}
/*
* Portable usleep helper
*/
void mbedtls_net_usleep( unsigned long usec )
{
mbedtls_printf ("%s() NOT IMPLEMENTED!!\n", __FUNCTION__);
}
/*
* Read at most 'len' characters
*/
int mbedtls_net_recv( void *ctx, unsigned char *buf, size_t len )
{
int32_t ret;
int32_t fd = ((mbedtls_net_context *) ctx)->fd;
if( fd < 0 )
{
return MBEDTLS_ERR_NET_INVALID_CONTEXT;
}
ret = (int32_t) read( fd, buf, len );
if( ret < 0 )
{
if(net_would_block(ctx) != 0)
{
return MBEDTLS_ERR_SSL_WANT_READ;
}
if(errno == EPIPE || errno == ECONNRESET)
{
return MBEDTLS_ERR_NET_CONN_RESET;
}
if(errno == EINTR)
{
return MBEDTLS_ERR_SSL_WANT_READ;
}
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 )
{
mbedtls_printf ("%s() NOT IMPLEMENTED!!\n", __FUNCTION__);
return mbedtls_net_recv( ctx, buf, len );
}
static int net_would_block( const mbedtls_net_context *ctx )
{
/*
* Do not return 'WOULD BLOCK' on a non-blocking socket
*/
int val = 0;
UNUSED(val);
if( ( fcntl( ctx->fd, F_GETFL, val) & 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 );
}
/*
* Write at most 'len' characters
*/
int mbedtls_net_send( void *ctx, const unsigned char *buf, size_t len )
{
int32_t ret;
int fd = ((mbedtls_net_context *) ctx)->fd;
if( fd < 0 )
{
return MBEDTLS_ERR_NET_INVALID_CONTEXT;
}
ret = (int32_t) write(fd, buf, len);
if( ret < 0 )
{
if(net_would_block(ctx) != 0)
{
return MBEDTLS_ERR_SSL_WANT_WRITE;
}
if(errno == EPIPE || errno == ECONNRESET)
{
return MBEDTLS_ERR_NET_CONN_RESET;
}
if(errno == EINTR)
{
return MBEDTLS_ERR_SSL_WANT_WRITE;
}
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;
initialized = 0;
}
#endif /* MBEDTLS_NET_C */
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