Richard Kuo / Mbed OS NTOUEE-mbed-Client

This is a simple mbed client example demonstrating, registration of a device with mbed Device Connector and reading and writing values as well as deregistering on different Network Interfaces including Ethernet, WiFi, 6LoWPAN ND and Thread respectively.

Fork of mbed-os-example-client by mbed-os-examples

Files at this revision

API Documentation at this revision

Revision 19:91eb6f58fd77, committed 2016-09-29

Comitter:
mbed_official
Date:
Thu Sep 29 16:15:08 2016 +0100
Parent:
18:628e22df9c41
Child:
20:5542a1afdc32
Commit message:
Merge pull request #88 from mikaleppanen/entropy

Added support for entropy poll to randomize source ports.

Commit copied from https://github.com/ARMmbed/mbed-os-example-client

Changed in this revision

main.cpp Show annotated file Show diff for this revision Revisions of this file
simpleclient.h Show annotated file Show diff for this revision Revisions of this file 
--- a/main.cpp	Wed Sep 21 07:30:08 2016 +0100
+++ b/main.cpp	Thu Sep 29 16:15:08 2016 +0100
@@ -18,6 +18,7 @@
 #include <sstream>
 #include <vector>
 #include "mbed-trace/mbed_trace.h"
+#include "mbedtls/entropy_poll.h"
 
 #include "security.h"
 
@@ -256,19 +257,29 @@
 // Entry point to the program
 int main() {
 
-#ifndef MBEDTLS_ENTROPY_HARDWARE_ALT
+    unsigned int seed;
+    size_t len;
 
-#ifdef MBEDTLS_TEST_NULL_ENTROPY
+#ifdef MBEDTLS_ENTROPY_HARDWARE_ALT
+    // Used to randomize source port
+    mbedtls_hardware_poll(NULL, (unsigned char *) &seed, sizeof seed, &len);
+
+#elif defined MBEDTLS_TEST_NULL_ENTROPY
+
 #warning "mbedTLS security feature is disabled. Connection will not be secure !! Implement proper hardware entropy for your selected hardware."
+    // Used to randomize source port
+    mbedtls_null_entropy_poll( NULL,(unsigned char *) &seed, sizeof seed, &len);
 
 #else
 
 #error "This hardware does not have entropy, endpoint will not register to Connector.\
 You need to enable NULL ENTROPY for your application, but if this configuration change is made then no security is offered by mbed TLS.\
 Add MBEDTLS_NO_DEFAULT_ENTROPY_SOURCES and MBEDTLS_TEST_NULL_ENTROPY in mbed_app.json macros to register your endpoint."
+
 #endif
 
-#endif
+    srand(seed);
+
     status_ticker.attach_us(blinky, 250000);
 
     // Keep track of the main thread

--- a/simpleclient.h	Wed Sep 21 07:30:08 2016 +0100
+++ b/simpleclient.h	Thu Sep 29 16:15:08 2016 +0100
@@ -91,7 +91,6 @@
                           void *handler=NULL) {
 	// Randomizing listening port for Certificate mode connectivity
     _server_address = server_address;
-	srand(time(NULL));
 	uint16_t port = rand() % 65535 + 12345;
 
     // create mDS interface object, this is the base object everything else attaches to