Add error handling on Socket_t in transport layer. (#887)

* Set tcpSocket to SOCKETS_INVALID_SOCKET when any error occurred in TLS_FreeRTOS_Connect.

* Initialize Socket_t to NULL.

FreeRTOS-Plus/Source/Application-Protocols/network_transport/tcp_sockets_wrapper/include/tcp_sockets_wrapper.h

@@ -25,7 +25,7 @@
  */
 
 /**
- * @file sockets_wrapper.h
+ * @file tcp_sockets_wrapper.h
  * @brief TCP transport functions wrapper.
  */
 

FreeRTOS-Plus/Source/Application-Protocols/network_transport/tcp_sockets_wrapper/ports/freertos_plus_tcp/tcp_sockets_wrapper.c

@@ -170,6 +170,7 @@ BaseType_t TCP_Sockets_Connect( Socket_t * pTcpSocket,
         if( tcpSocket != FREERTOS_INVALID_SOCKET )
         {
             ( void ) FreeRTOS_closesocket( tcpSocket );
+            tcpSocket = FREERTOS_INVALID_SOCKET;
         }
     }
     else
@@ -192,7 +193,7 @@ void TCP_Sockets_Disconnect( Socket_t tcpSocket )
     BaseType_t waitForShutdownLoopCount = 0;
     uint8_t pDummyBuffer[ 2 ];
 
-    if( tcpSocket != FREERTOS_INVALID_SOCKET )
+    if( ( tcpSocket != NULL ) && ( tcpSocket != FREERTOS_INVALID_SOCKET ) )
     {
         /* Initiate graceful shutdown. */
         ( void ) FreeRTOS_shutdown( tcpSocket, FREERTOS_SHUT_RDWR );

FreeRTOS-Plus/Source/Application-Protocols/network_transport/transport_mbedtls.c

@@ -633,6 +633,7 @@ TlsTransportStatus_t TLS_FreeRTOS_Connect( NetworkContext_t * pNetworkContext,
     TlsTransportParams_t * pTlsTransportParams = NULL;
     TlsTransportStatus_t returnStatus = TLS_TRANSPORT_SUCCESS;
     BaseType_t socketStatus = 0;
+    BaseType_t isSocketConnected = pdFALSE, isTlsSetup = pdFALSE;
 
     if( ( pNetworkContext == NULL ) ||
         ( pNetworkContext->pParams == NULL ) ||
@@ -660,6 +661,10 @@ TlsTransportStatus_t TLS_FreeRTOS_Connect( NetworkContext_t * pNetworkContext,
     if( returnStatus == TLS_TRANSPORT_SUCCESS )
     {
         pTlsTransportParams = pNetworkContext->pParams;
+
+        /* Initialize tcpSocket. */
+        pTlsTransportParams->tcpSocket = NULL;
+
         socketStatus = TCP_Sockets_Connect( &( pTlsTransportParams->tcpSocket ),
                                             pHostName,
                                             port,
@@ -678,6 +683,8 @@ TlsTransportStatus_t TLS_FreeRTOS_Connect( NetworkContext_t * pNetworkContext,
     /* Initialize mbedtls. */
     if( returnStatus == TLS_TRANSPORT_SUCCESS )
     {
+        isSocketConnected = pdTRUE;
+
         returnStatus = initMbedtls( &( pTlsTransportParams->sslContext.entropyContext ),
                                     &( pTlsTransportParams->sslContext.ctrDrgbContext ) );
     }
@@ -691,17 +698,25 @@ TlsTransportStatus_t TLS_FreeRTOS_Connect( NetworkContext_t * pNetworkContext,
     /* Perform TLS handshake. */
     if( returnStatus == TLS_TRANSPORT_SUCCESS )
     {
+        isTlsSetup = pdTRUE;
+
         returnStatus = tlsHandshake( pNetworkContext, pNetworkCredentials );
     }
 
     /* Clean up on failure. */
     if( returnStatus != TLS_TRANSPORT_SUCCESS )
     {
-        if( ( pNetworkContext != NULL ) && ( pNetworkContext->pParams != NULL ) )
+        /* Free SSL context if it's setup. */
+        if( isTlsSetup == pdTRUE )
         {
             sslContextFree( &( pTlsTransportParams->sslContext ) );
+        }
 
+        /* Call Sockets_Disconnect if socket was connected. */
+        if( isSocketConnected == pdTRUE )
+        {
             TCP_Sockets_Disconnect( pTlsTransportParams->tcpSocket );
+            pTlsTransportParams->tcpSocket = NULL;
         }
     }
     else

FreeRTOS-Plus/Source/Application-Protocols/network_transport/transport_mbedtls_pkcs11.c

@@ -669,6 +669,7 @@ TlsTransportStatus_t TLS_FreeRTOS_Connect( NetworkContext_t * pNetworkContext,
     TlsTransportParams_t * pTlsTransportParams = NULL;
     TlsTransportStatus_t returnStatus = TLS_TRANSPORT_SUCCESS;
     BaseType_t socketStatus = 0;
+    BaseType_t isSocketConnected = pdFALSE;
 
     if( ( pNetworkContext == NULL ) ||
         ( pNetworkContext->pParams == NULL ) ||
@@ -696,6 +697,10 @@ TlsTransportStatus_t TLS_FreeRTOS_Connect( NetworkContext_t * pNetworkContext,
     if( returnStatus == TLS_TRANSPORT_SUCCESS )
     {
         pTlsTransportParams = pNetworkContext->pParams;
+
+        /* Initialize tcpSocket. */
+        pTlsTransportParams->tcpSocket = NULL;
+
         socketStatus = TCP_Sockets_Connect( &( pTlsTransportParams->tcpSocket ),
                                             pHostName,
                                             port,
@@ -714,13 +719,19 @@ TlsTransportStatus_t TLS_FreeRTOS_Connect( NetworkContext_t * pNetworkContext,
     /* Perform TLS handshake. */
     if( returnStatus == TLS_TRANSPORT_SUCCESS )
     {
+        isSocketConnected = pdTRUE;
+
         returnStatus = tlsSetup( pNetworkContext, pHostName, pNetworkCredentials );
     }
 
     /* Clean up on failure. */
     if( returnStatus != TLS_TRANSPORT_SUCCESS )
+    {
+        if( isSocketConnected == pdTRUE )
         {
             TCP_Sockets_Disconnect( pTlsTransportParams->tcpSocket );
+            pTlsTransportParams->tcpSocket = NULL;
+        }
     }
     else
     {

FreeRTOS-Plus/Source/Application-Protocols/network_transport/transport_plaintext.c

@@ -71,6 +71,10 @@ PlaintextTransportStatus_t Plaintext_FreeRTOS_Connect( NetworkContext_t * pNetwo
     else
     {
         pPlaintextTransportParams = pNetworkContext->pParams;
+
+        /* Initialize tcpSocket. */
+        pPlaintextTransportParams->tcpSocket = NULL;
+
         /* Establish a TCP connection with the server. */
         socketStatus = TCP_Sockets_Connect( &( pPlaintextTransportParams->tcpSocket ),
                                             pHostName,

FreeRTOS-Plus/Source/Application-Protocols/network_transport/transport_wolfSSL.c

@@ -380,7 +380,7 @@ TlsTransportStatus_t TLS_FreeRTOS_Connect( NetworkContext_t * pNetworkContext,
 {
     TlsTransportStatus_t returnStatus = TLS_TRANSPORT_SUCCESS;
     BaseType_t socketStatus = 0;
-
+    BaseType_t isSocketConnected = pdFALSE;
 
     if( ( pNetworkContext == NULL ) ||
         ( pHostName == NULL ) ||
@@ -402,6 +402,8 @@ TlsTransportStatus_t TLS_FreeRTOS_Connect( NetworkContext_t * pNetworkContext,
     /* Establish a TCP connection with the server. */
     if( returnStatus == TLS_TRANSPORT_SUCCESS )
     {
+        pNetworkContext->tcpSocket = NULL;
+
         socketStatus = TCP_Sockets_Connect( &( pNetworkContext->tcpSocket ),
                                             pHostName,
                                             port,
@@ -420,6 +422,8 @@ TlsTransportStatus_t TLS_FreeRTOS_Connect( NetworkContext_t * pNetworkContext,
     /* Initialize tls. */
     if( returnStatus == TLS_TRANSPORT_SUCCESS )
     {
+        isSocketConnected = pdTRUE;
+
         returnStatus = initTLS();
     }
 
@@ -431,8 +435,12 @@ TlsTransportStatus_t TLS_FreeRTOS_Connect( NetworkContext_t * pNetworkContext,
 
     /* Clean up on failure. */
     if( returnStatus != TLS_TRANSPORT_SUCCESS )
+    {
+        if( isSocketConnected == pdTRUE )
         {
             TCP_Sockets_Disconnect( pNetworkContext->tcpSocket );
+            pNetworkContext->tcpSocket = NULL;
+        }
     }
     else
     {