handshake in ssl_client.cpp (#2044)

* issue #2041

* handshake timeout

* seconds to milliseconds

Author: a-c-sreedhar-reddy

libraries/WiFiClientSecure/src/WiFiClientSecure.cpp

@@ -35,7 +35,7 @@ WiFiClientSecure::WiFiClientSecure()
     sslclient = new sslclient_context;
     ssl_init(sslclient);
     sslclient->socket = -1;
-
+    sslclient->handshake_timeout = 120000;
     _CA_cert = NULL;
     _cert = NULL;
     _private_key = NULL;
@@ -50,6 +50,7 @@ WiFiClientSecure::WiFiClientSecure(int sock)
     sslclient = new sslclient_context;
     ssl_init(sslclient);
     sslclient->socket = sock;
+    sslclient->handshake_timeout = 120000;
 
     if (sock >= 0) {
         _connected = true;
@@ -285,3 +286,8 @@ int WiFiClientSecure::lastError(char *buf, const size_t size)
     snprintf(buf, size, "%s", error_buf);
     return _lastError;
 }
+
+void WiFiClientSecure::setHandshakeTimeout(unsigned long handshake_timeout)
+{
+    sslclient->handshake_timeout = handshake_timeout * 1000;
+}

libraries/WiFiClientSecure/src/WiFiClientSecure.h

@@ -62,6 +62,7 @@ class WiFiClientSecure : public WiFiClient
     bool loadCertificate(Stream& stream, size_t size);
     bool loadPrivateKey(Stream& stream, size_t size);
     bool verify(const char* fingerprint, const char* domain_name);
+    void setHandshakeTimeout(unsigned long handshake_timeout);
 
     operator bool()
     {

libraries/WiFiClientSecure/src/ssl_client.cpp

@@ -158,12 +158,14 @@ int start_ssl_client(sslclient_context *ssl_client, const char *host, uint32_t p
     mbedtls_ssl_set_bio(&ssl_client->ssl_ctx, &ssl_client->socket, mbedtls_net_send, mbedtls_net_recv, NULL );
 
     log_v("Performing the SSL/TLS handshake...");
-
+    unsigned long handshake_start_time=millis();
     while ((ret = mbedtls_ssl_handshake(&ssl_client->ssl_ctx)) != 0) {
         if (ret != MBEDTLS_ERR_SSL_WANT_READ && ret != MBEDTLS_ERR_SSL_WANT_WRITE) {
             return handle_error(ret);
         }
-	vTaskDelay(10 / portTICK_PERIOD_MS);
+        if((millis()-handshake_start_time)>ssl_client->handshake_timeout)
+			return -1;
+	    vTaskDelay(10 / portTICK_PERIOD_MS);
     }
 
 

libraries/WiFiClientSecure/src/ssl_client.h

@@ -23,6 +23,8 @@ typedef struct sslclient_context {
     mbedtls_x509_crt ca_cert;
     mbedtls_x509_crt client_cert;
     mbedtls_pk_context client_key;
+
+    unsigned long handshake_timeout;
 } sslclient_context;