Diff: platform/mbedtls/network.cpp

Revision:

0:082731ede69f

--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/platform/mbedtls/network.cpp	Wed May 30 20:59:51 2018 +0000
@@ -0,0 +1,223 @@
+/*
+ *  TCP/IP or UDP/IP networking functions
+ *
+ *  This version of net_sockets.c is setup to use ARM easy-connect for network connectivity
+ *
+ *
+ *  Licensed under the Apache License, Version 2.0 (the "License"); you may
+ *  not use this file except in compliance with the License.
+ *  You may obtain a copy of the License at
+ *
+ *  http://www.apache.org/licenses/LICENSE-2.0
+ *
+ *  Unless required by applicable law or agreed to in writing, software
+ *  distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
+ *  WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ *  See the License for the specific language governing permissions and
+ *  limitations under the License.
+ *
+ */
+
+#include "mbed.h"
+
+#include "easy-connect.h"
+
+#define MBEDTLS_FS_IO 1
+
+#include <stdbool.h>
+#include <string.h>
+#include <timer_platform.h>
+#include <network_interface.h>
+
+#include "mbedtls/platform.h"
+#include "mbedtls/ssl.h"
+#include "mbedtls/entropy.h"
+#include "mbedtls/ctr_drbg.h"
+#include "mbedtls/error.h"
+#include "mbedtls/x509_crt.h"
+#include "mbedtls/pk.h"
+
+#if DEBUG_LEVEL > 0
+#include "mbedtls/debug.h"
+#endif
+
+#include "aws_iot_error.h"
+#include "aws_iot_log.h"
+#include "network_interface.h"
+#include "network_platform.h"
+
+#include "awscerts.h"
+
+
+NetworkInterface *network = NULL;
+TCPSocket        mbedtls_socket;
+bool             network_connected = false;
+
+/*
+ * Initialize a context
+ */
+void mbedtls_aws_init( mbedtls_net_context *ctx )
+{
+    FUNC_ENTRY;
+
+    if( network != NULL )
+        network->disconnect();       //disconnect from the current network
+
+    network_connected = false;
+    network = easy_connect(true);
+    if (!network) {
+        IOT_DEBUG("Network Connection Failed!");
+        return;
+        }
+    IOT_DEBUG("Modem SW Revision: %s", FIRMWARE_REV(network));
+    network_connected = true;
+    ctx->fd = 1;
+}
+
+/*
+ * Initiate a TCP connection with host:port and the given protocol
+ * return 0 if success, otherwise error is returned
+ */
+int mbedtls_aws_connect( mbedtls_net_context *ctx, const char *host, uint16_t port, int proto )
+{
+    FUNC_ENTRY;
+    if( !network_connected ) {
+        IOT_DEBUG("No network connection");
+        FUNC_EXIT_RC(NETWORK_ERR_NET_CONNECT_FAILED);
+        }
+
+    int ret = mbedtls_socket.open(network) || mbedtls_socket.connect(host,port);
+    if( ret != 0 ){
+        IOT_DEBUG("Socket Open Failed - %d",ret);
+        }
+
+    FUNC_EXIT_RC(ret);
+}
+
+/*
+ * Create a listening socket on bind_ip:port
+ */
+int mbedtls_aws_bind( mbedtls_net_context *ctx, const char *bind_ip, const char *port, int proto )
+{
+    FUNC_EXIT_RC(MBEDTLS_ERR_NET_BIND_FAILED);
+}
+
+/*
+ * Accept a connection from a remote client
+ */
+int mbedtls_aws_accept( mbedtls_net_context *bind_ctx,
+                        mbedtls_net_context *client_ctx,
+                        void *client_ip, size_t buf_size, size_t *ip_len )
+{
+    FUNC_ENTRY;
+    FUNC_EXIT_RC(MBEDTLS_ERR_NET_ACCEPT_FAILED );
+}
+
+/*
+ * Set the socket blocking or non-blocking
+ */
+int mbedtls_aws_set_block( mbedtls_net_context *ctx )
+{
+        mbedtls_socket.set_blocking(true);
+        return 0;
+}
+
+int mbedtls_aws_set_nonblock( mbedtls_net_context *ctx )
+{
+    mbedtls_socket.set_blocking(false);
+    return 0;
+}
+
+/*
+ * Portable usleep helper
+ */
+void mbedtls_aws_usleep( unsigned long usec )
+{
+    FUNC_ENTRY;
+    Timer t;
+    t.start();
+    while( t.read_us() < (int)usec )
+        /* wait here */ ;
+}
+
+/*
+ * Read at most 'len' characters
+ */
+int mbedtls_aws_recv( void *ctx, unsigned char *buf, size_t len )
+{
+    int ret;
+    int fd = ((mbedtls_net_context *) ctx)->fd;
+
+    FUNC_ENTRY;
+    if( fd < 0 )
+        FUNC_EXIT_RC(MBEDTLS_ERR_NET_INVALID_CONTEXT );
+
+    ret = (int) mbedtls_socket.recv( buf, len );
+
+    if( ret == NSAPI_ERROR_WOULD_BLOCK )
+        ret = MBEDTLS_ERR_SSL_WANT_READ;
+    FUNC_EXIT_RC(ret );
+}
+
+/*
+ * Read at most 'len' characters, blocking for at most 'timeout' ms
+ */
+int mbedtls_aws_recv_timeout( void *ctx, unsigned char *buf, size_t len, uint32_t timeout )
+{
+    int   ret, ttime;
+    Timer t;
+    int   fd = ((mbedtls_net_context *) ctx)->fd;
+    FUNC_ENTRY;
+    if( fd < 0 )
+        FUNC_EXIT_RC(MBEDTLS_ERR_NET_INVALID_CONTEXT );
+
+    t.start();
+    do {
+        ret = mbedtls_socket.recv( buf, len );
+        ttime = t.read_ms();
+        if( ret == 0 && ttime < (int)timeout )
+            ret = mbedtls_socket.recv( buf, len );
+       }
+    while( ttime < (int)timeout && ret == NSAPI_ERROR_WOULD_BLOCK );
+
+    if( ret < 0 && ttime >= (int)timeout )
+        ret = MBEDTLS_ERR_SSL_TIMEOUT;
+    FUNC_EXIT_RC(ret);
+}
+
+/*
+ * Write at most 'len' characters
+ */
+int mbedtls_aws_send( void *ctx, const unsigned char *buf, size_t len )
+{
+    int ret;
+    int fd = ((mbedtls_net_context *) ctx)->fd;
+
+    FUNC_ENTRY;
+
+    if( fd < 0 )
+        FUNC_EXIT_RC(MBEDTLS_ERR_NET_INVALID_CONTEXT );
+
+    while( (ret = mbedtls_socket.send(buf, len)) == NSAPI_ERROR_WOULD_BLOCK )
+        /* keep trying */;
+    if( ret < 0 ) 
+        ret = (ret == NSAPI_ERROR_WOULD_BLOCK )? MBEDTLS_ERR_SSL_WANT_WRITE : MBEDTLS_ERR_NET_SEND_FAILED;
+    FUNC_EXIT_RC( ret );
+}
+
+/*
+ * Gracefully close the connection
+ */
+void mbedtls_aws_free( mbedtls_net_context *ctx )
+{
+    FUNC_ENTRY;
+    if( !network_connected || ctx->fd < 0 ) {
+        FUNC_EXIT;
+        }
+
+    mbedtls_socket.close();
+    network->disconnect();       //disconnect from the current network
+    ctx->fd = -1;
+    FUNC_EXIT;
+}
+