As an exercise in password storage i implemented a PHP function that takes a UTF-8 encoded Unicode cleartext, generates a random salt and produces a password hash using the MD5 algorithm. Please note that this is just an exercise and should not be used in production. This code has not been properly tested and has […]
Articles in Category "GNU/Linux"
Einige Bemerkungen zur neuen Webseite des Verkehrsverbundes Rhein-Neckar GmbH (VRN)
23. November 2016 in Society, Programming, Technology.
Einleitung Ich bin selbstständiger Web-Entwickler und bin immmer auf der Suche nach interessanten Fallbeispielen, und zwar nicht nur nach den Gelungenen sondern auch nach den Problematischen. Heute möchte ich ein Beispiel für Letztere aus meinem persönlichen Erfahrungsbereich präsentieren. Als zahlender Kunde freut es mich zwar, dass der öffentliche Verkehrsverbund der Region, VRN GmbH sich zu […]
USB-WLAN-Adapter mit externer, ausrichtbarer Antenne
28. Juni 2016 in GNU/Linux.
Habe jetzt den Edimax EW-7811UAC (Hersteller-Seite) am Linux-Laptop im Einsatz, um Probleme mit der Verbindungsqualität beim Einsatz im Aussenbereich zu beheben. Treiber: https://github.com/diederikdehaas/rtl8812AU Hinweis: Andere Varianten des rtl8812-Treibers haben es nicht geschafft, das Gerät zu erkennen bzw. zu initialisieren.Ich verwende Linux Kernel Version 4.1.0. Alles bestens: Das Gerät funktioniert mit diesem Treiber problemlos, es etabliert […]
Rejecting Microsoft Executables and Office Documents with Postfix
16. Juli 2020 in Administration, GNU/Linux.
Update July 16th 2020: A reader has pointed out to me that the regular expression did not (or did not always) match if the filename of the attachment contained non-ASCII characters, opening a simple way to circumvent this header check. I was able to reproduce this behavior by sending a mail with a single attachment […]
Basic Example for Response-Policy-Zones with BIND
31. Oktober 2015 in Administration, GNU/Linux.
I would like to emulate a public DNS entry that does not exist yet, while i am developing the service that will use this name on an intranet server. Let a public domain name i develop the service for be myservice.my-cool-domain.biz. When working in my intranet 192.168.2.0/24, i want to override whatever public DNS resolves […]
Ad-Blocking with BIND9 and NGINX
31. Oktober 2015 in Administration, GNU/Linux.
In my intranet, where hosts are in a subnet 192.168.2.0/24 and domain names in a domain mydomain, I use BIND9 as DNS, running on host intradns.mydomain , and NGINX as a webserver running on intraweb.mydomain. I would like to rewrite all subdomains of certain public domains (spammers and trackers) using my intranet DNS to a […]
I18n of Bourne Shell Scripts Using “gettext.sh”
18. August 2015 in GNU/Linux, Programming.
This article shows how to make a Bourne Shell script translatable by means of the “gettext” toolchain and how it then operates with natural language strings translated into the user’s language.
“jack-autostart” – Setup and Start Scripts for jackd
9. September 2015 in GNU/Linux, Multimedia, Programming, Technology.
“jack-autostart” is essentially a start script (I use it for my XFCE sessions) that starts „jackd“ with appropriate command line parameters and configures as many applications as possible to route playback to the JACK service. For this purpose, redirect all ALSA playback to JACK, and set JACK as default audiosink/-source for GStreamer.