c – Implementation of the square root for real time application

For the real time control software I need square root calculation. I have heard that the sqrt function from the standard library isn’t good choice due to the unpredictable number of iterations used during calculation. Based on that information I have decided to implement the sqrt function in my own based on the Newton tangent method. So I have exploited the iteration formula

$$x_{k+1} = -frac{f(x_k)}{f'(x_k)} + x_k,$$ where $$f(x) = x^2 – a$$ and $$a$$ is the radicant.

Based on the above mentioned formulas I have

$$x_{k+1} = frac{1}{2}cdotleft(x_k + frac{a}{x_k}right)$$

I have chosen $$x(0) = 2$$ and based on my observations four iterations give good results in comparison with the sqrt from the standard library.

#define ITERATIONS 4

double squareRoot(double a)
{
    double xk  = 2.0; // x(k)
    
    uint8_t k;
    for(k = 0; k < ITERATIONS; k++)
    {
        xk  = 0.5*(xk + a/xk);
    }
    
    return xk;
}

Despite that fact I have some doubts regarding the choice of the initial value and number of iterations.

root access – Device info changer for android 11


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root access – Stopping Android updates?

Ok, so I have a question with which android apps/files are responsible for phone updates and app updates?. For instance let’s say using a standard tracfone no particular brand or if needed Samsung A21. And I have the phone set up exactly how I want it and I want absolutely no updates to any system or application files. The phone is rooted. Which files would I remove to keep it exactly like it is? Android version would be of that of the new tracphones found at any walmart.

drush – “Drupal root not found. Pass –root or a @siteAlias in order to see Drupal-specific commands”

I have multiple sites inside the same htdocs directory. In one, I removed all the folders except vendor under Web. Now drush will not work (it worked before I moved the folders). But now, it cannot find the database, which is correctly defined in web/sites/default/settings.php

/srv/www/htdocs/jar/drupal # ./drush status
 PHP binary    : /usr/bin/php
 PHP config    : /srv/www/php.ini
 PHP OS        : Linux
 Drush script  : /srv/www/htdocs/jar/drupal/vendor/drush/drush/drush
 Drush version : 10.3.6
 Drush temp    : /tmp
 Drush configs : /srv/www/htdocs/jar/drupal/vendor/drush/drush/drush.yml
 Drupal root   : /srv/www/htdocs/jar/drupal

I am running Drupal 9.0.8 and drush 10.3.6 (in /srv/www/htdocs/jar/drupal). I have removed drush using composer (2.0.3) and reinstalled it (recreating vendor in the process).

/srv/www/htdocs/jar/drupal # ./drush -vvv cr
 (preflight) Config paths: /srv/www/htdocs/jar/drupal/vendor/drush/drush/drush.yml
 (preflight) Alias paths: /srv/www/htdocs/jar/drupal/drush/sites,/srv/www/htdocs/jar/drush/sites
 (preflight) Commandfile search paths: /srv/www/htdocs/jar/drupal/vendor/drush/drush/src
 (debug) Starting bootstrap to site (0.04 sec, 8.17 MB)

In BootstrapHook.php line 32:
  (Exception)
  Bootstrap failed. Run your command with -vvv for more information.
Exception trace:
  at /srv/www/htdocs/jar/drupal/vendor/drush/drush/src/Boot/BootstrapHook.php:32
 DrushBootBootstrapHook->initialize() at /srv/www/htdocs/jar/drupal/vendor/consolidation/annotated-command/src/Hooks/Dispatchers/InitializeHookDispatcher.php:44
 ConsolidationAnnotatedCommandHooksDispatchersInitializeHookDispatcher->doInitializeHook() at /srv/www/htdocs/jar/drupal/vendor/consolidation/annotated-command/src/Hooks/Dispatchers/InitializeHookDispatcher.php:36
 ConsolidationAnnotatedCommandHooksDispatchersInitializeHookDispatcher->callInitializeHook() at /srv/www/htdocs/jar/drupal/vendor/consolidation/annotated-command/src/Hooks/Dispatchers/InitializeHookDispatcher.php:29
 ConsolidationAnnotatedCommandHooksDispatchersInitializeHookDispatcher->initialize() at /srv/www/htdocs/jar/drupal/vendor/consolidation/annotated-command/src/CommandProcessor.php:145
 ConsolidationAnnotatedCommandCommandProcessor->initializeHook() at /srv/www/htdocs/jar/drupal/vendor/consolidation/annotated-command/src/AnnotatedCommand.php:296
 ConsolidationAnnotatedCommandAnnotatedCommand->initialize() at /srv/www/htdocs/jar/drupal/vendor/symfony/console/Command/Command.php:221
 SymfonyComponentConsoleCommandCommand->run() at /srv/www/htdocs/jar/drupal/vendor/symfony/console/Application.php:1018
 SymfonyComponentConsoleApplication->doRunCommand() at /srv/www/htdocs/jar/drupal/vendor/symfony/console/Application.php:271
 SymfonyComponentConsoleApplication->doRun() at /srv/www/htdocs/jar/drupal/vendor/symfony/console/Application.php:147
 SymfonyComponentConsoleApplication->run() at /srv/www/htdocs/jar/drupal/vendor/drush/drush/src/Runtime/Runtime.php:118
 DrushRuntimeRuntime->doRun() at /srv/www/htdocs/jar/drupal/vendor/drush/drush/src/Runtime/Runtime.php:49
 DrushRuntimeRuntime->run() at /srv/www/htdocs/jar/drupal/vendor/drush/drush/drush.php:72
 require() at /srv/www/htdocs/jar/drupal/vendor/drush/drush/drush:4

I looked at all the above suggestions, but am stuck. Drush works perfectly on my other 5 sites…

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event sourcing – In CQRS/ES where does an Aggregate Root belong?

Disclaimer: This question may be related to the framework I’m using to support CQRS/ES rather than the concepts themselves but many of these frameworks implement the same strategies, making me think the two are tightly coupled regardless.

CQRS tells us to…

use a different model to update information than the model you use to read information1

And in event sourcing…

The fundamental idea of Event Sourcing is that of ensuring every change to the state of an application is captured in an event object2

My design includes aggregate root objects, upon which methods are called to make changes (in my particular case called from Commands/Handlers). Those methods check the invariants and then publish an event to a bus, which in turn updates some aspect of the aggregate, typically setting properties or adding items to a collection. These events also update my read model so that I have a projection of the most recent state of the system that can be easily queried. Most of my queries simply act upon the most recent state, but occasionally I need to create a projection for an aggregate as it existed at a point in the past (hence the use of event sourcing).

As such my aggregate root and read model share a very similar “shape”, so similar that I’ve created an interface that both implement so that I can treat them equally depending on the type of query being executed.

Given that the aggregate root and read model are so similar, and even though the aggregate appears to belong to the write model (as the commands act upon it) does it in fact belong in the read model?

Or, where does the aggregate root belong? In the write model, the read model or in a shared domain model, which seems to go against the whole CRQS idea?

javascript – How to import a component outside root in react?

I am having two react applications,

Project A

Project B

Here Project A is nothing but a simple components application and it contains the only common components.

-> src
    -> components
       -> Button

This is a very simple button component I have in the Project A.

Now the requirement is that I am in the need to use this common button component inside any other react applications.

Here in this scenario, I need to use Button component from Project A inside Project B.

For which I tried some relative import (I understand it is completely wrong) inside src/App.js file of Project B like,

import {Button} from "../../../Project A/src/components

But it gives the error as expected,

Module not found: You attempted to import ../../../Project A/src/components which falls outside of the project src/ directory. Relative imports outside of src/ are not supported.

So could anyone help me how to include the button component from Project A inside Project B ?

If a mobile app pins the Root Authority Certificate of a server and verifies its hostname, is it possible an attack via DNS-poisoning?

… it should be possible to an attacker to redirect in some way the victim to a malicious website with the same Root CA.

This will only be possible if the client blindly believes any certificate signed by this CA. This level of trust should of course not be done if the root CA might also issue certificates to an attacker, as is the case with common public CA. That’s why a TLS client is supposed to verify if the subject of the certificate matches the expectation too, i.e. if the specified target hostname or IP is covered by the certificate.

… pins the Root CA but verifies the hostname of the server which the app is connecting to

That’s what a properly written app will do.

If the attacker owns a website under the same Root CA, can he poison DNS-cache and let the app connect to his website or there are security mechanisms which prevent such behaviour?

The client should check the subject of the certificate with the intended hostname or IP. While DNS lookup of a domain might result an alias (CNAME) this will not change the intended hostname, but is only an internal step in getting the IP address. This means DNS poisoning against the client cannot be used to change the intended domain and therefore the attacker needs to have a certificate for the intended domain – which the CA should not issue since the attacker cannot proof to own it.

But, DNS poisoning against the CA might be use to fake the proof of ownership in domain validated certificates. In this case the attacker could get a valid certificate for the target domain which then can be used against the client, for example in a DNS poisoning attack against the client.

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