Configuring a WordPress Network (without login loop)

Using a WordPress network seems to be interesting as soon as you run multiple WordPress instances on different domain names. You can safe a lot of work using a network installation because you have to maintain just one software installation.

That’s what we did here. There is a great page with configuration instructions found here. We chose the domain based installation and basically everything worked as expected. But unfortunately not everything (the site runs with an Apache web server on FreeBSD).

As soon as we added users to sites those users were unable to login. There seems to be some kind of redirect loop similar to what is described here. There are several other pages found on the web which describe a similar behavior. Unfortunately, the solution was not found directly and it took several hours of debugging and searching Google. A French guy brought a solution (sorry dude, can’t remember your URL).

Simply edit the following ‘define’ in your wp-config.php like this:

define( 'DOMAIN_CURRENT_SITE', $_SERVER['HTTP_HOST']);

Another question that may come up is what to do if you want to add some subfolders to your domain (on your web server) which are not under control of WordPress (such as e.g. downloads or whatever). In the WP network installation with Apache’s mod_rewrite everything will be redirected to WP. You can circumvent this by either modifying your rewrite rules in such a way that those subdirectories are excluded (done with RewriteRule ^subfolder.* - [L]) or more simply by just adding the Apache directive Alias to your server configuration.

Annoying RF_KILL on HP/Compaq 2510p

Yesterday I tried to connect an old notebook which has no Wifi adapter to the Internet through my HP 2510p. Usually not a big deal; connect through an Ethernet cable, configure IP addresses on both sides, enable packet forwarding and configure an iptables masquerading rule.

But it didn’t work. As soon as I connected the network cable my Wifi was disabled. My first guess was that the network-manager executes some ifup/down scripts. I often made bad experiences with the network-manager as soon as you try to manually reconfigure the network.

Thus, I disabled it as usual but it didn’t change the WLAN-switch-off behavior. I reloaded the iwlagn kernel module, without success. I browsed the web to find somebody with a similar problem, unfortunately without success.

The following kernel message appeared suddenly after connecting the cable.

iwlagn 0000:10:00.0: RF_KILL bit toggled to disable radio.

Rfkill showed that the Wifi is disabled by hardware. This led me to the conclusion that this could be some HP hardware “feature”. I rebooted into the BIOS. In the Built-In Device Configuration menu there is the option LAN/WLAN-Switching. The BIOS manual explains that “With this option LAN/WLAN-Switching is enabled/disabled” — very helpful…

Nevertheless, disabling this solved the problem 🙂

 

28C3 News — Day 3.828

Day 3 ist voll im Gange, da beginnt man schon etwas ans Ende des Kongresses zu denken :'(

Gestern gabs noch eine Menge interessanter VortrĂ€ge. Roger Dingledine und Jacob Applebaum gaben einen Überblick ĂŒber staatliche Angriffe auf das Tor-Netzwerk, unterlegt mit einer Menge Grafiken. Wie ĂŒblich waren die beiden ziemlich lange nach dem Vortrag noch belagert von Interessierten, die eine Menge Fragen hatten oder einfach so plaudern wollten — wie auch wir natĂŒrlich. Seit vielen Jahren bereits arbeiten wir an einer Lösung des Problems “anonymes DNS“. Auf der 25C3 haben wir OnionCat publiziert, ein Tor- bzw. I2P-basiertes VPN, cooles Projekt, hat aber das DNS-Problem nicht gelöst. Unsere neue Idee scheint zu funktioneren, auch Roger hat dem zugestimmt — great success!

Ein Dauerbrenner sind natĂŒrlich immer die VortrĂ€ge von Martin Haase, der Reden und Interviews ausgewĂ€hlter Politiker immer bis ins kleinste zerlegt. Hier nochmal eine der genialsten Folien. Danach kam wieder ein spannender Bericht von Bicyclemark.

In der Hardware-Hacking-Ecke gibt’s einen ziemlich coolen 3D-Printer, kann man um 700€ selbser bauen, eine computergesteuerte Strickmaschine und noch eine Menge anderer verrĂŒckert Hardware-basteleien.

Heute zu Mittag hat der Kongress gleich mal mit dem JahresrĂŒckblickmarathon begonnen, immer wieder schön zum Zuhören.

Am Nachmittag gab’s dann einen technische Vortrag von Haral Welte, GrĂŒnder und UnterstĂŒtzer vieler freier Projekter, u.a. OpenMoko. Er hat sehr detailliert den höchst verwirrenden und undurchsichtigen Protokollstack von GSM, GPRS und UMTS vorgestellt. Auf eine Publikumsfrage, warum der Stack bei UMTS nicht einfach entrĂŒmpelt wurde (wo die Gelegenheit dazu war meinte er: “The assumption is wrong that these systems are made to be reasonable.”.

Bald gibt’s Neues, in besonderer Erwartung auf den Fnord JahresrĂŒckblick.

 

Smrender — A New Renderer for OSM Data

Smrender

About two months ago we started a completely new projected, originally just as my personal intention. It is a new rendering software for OSM data, just because currently there are just two popular renderers, these are Mapnik and Osmarender.

The project is called smrender which is a short form for seamap render and is targeted for OpenSeamap but not limited to :).

Goals and Description

The primary development goal is to create a renderer which creates sea charts intended for print-out. Secondary goals are performance and memory efficency. The image on the right shows a chart rendered with smrender showing a part of the Croatian coastline. The image is scaled for a printout on A3 paper with a density of 300 dpi.

Smrender is a software which reads an OSM file, applies rules to the objects and creates a raster image. The output is projected and scaled adequately to be used as a paper sea chart (as long as neither the printing software nor the printer itself rescales it). The rules are defined as XML (OSM) file. Each rule consist of match options and an action which is carried out if an object matches. The rules currently support direct string compare, regex matching, match inversion (NOT), exclusion of specific tags, and function calls to shared objects. The latter is intended to be a modular interface to third-party modules. The actions may be text output, lines, polygons and image overlays.

A special feature is the auto-rotation of texts and images: the software tries to rotate an image or a string such that it does not interfere with other objects (as good as possible).

Smrender also closes open polygons such as segments of the coastline. The coastline is usually not a single closed way but rather a set of concatenated open ways for two reasons. First, because different tags may be attached to different parts of a coastline, and second  because usually you obviously just select a specific region from the OSM database and not the whole world. The OSM database will just return the ways which are within the selected bounding box. Closing those polygons is vital because you can’t fill open ones 😉

With all this, smrender can render a complete chart with all features at once, without any overlays or prerendered basemaps.

In the following there’s a snippet of a ruleset to give you an idea how it looks like and how it works…and code usually explains more than 1000 words. A short description is found below.


1 <node>
2 <tag k=’seamark:type’ v=”/>
3 <tag k=’_action_’ v=’func:pchar@./libsmfilter.so’/>
4 </node>
5 <node>
6 <tag k=’/^seamark:light:.*/’ v=”/>
7 <tag k=’_action_’ v=’img-auto:icons/Light_Magenta_90.png’/>
8 </node>
9 <node>
10 <tag k=’_action_’ v=’cap:/usr/share/fonts/truetype/ttf-liberation/LiberationSans-Italic.ttf,1.4,cm,black,auto;whit
11 e,name’/>
12 <tag k=’natural’ v=’bay’/>
13 </node>
14 <way>
15 <tag k=’highway’ v=’/^(secondary|primary|residential)$/’/>
16 <tag k=’_action_’ v=’draw:black’/>
17 </way>

Lines 1 – 4 match all nodes with the tag with the key ‘seamark:type=*’ and calls the function pchar of the shared object libsmfilter.so. The library is loaded dynamically on startup.

Lines 5 – 8 match all nodes which have any tag whose key starts with ‘seamark:light:’. Smrender uses POSIX regular expressions in that case. On a match the image with the given filename is placed into the chart and in this case it uses auto-rotation. That means that smrender samples the area around the position of the node and tries to find a place where as less as other objects are in place already. Of course this does just make sense for some specific types of nodes like the magenta light flares (see sample picture above).

Lines 9 – 13 places an auto-rotated caption at the matching nodes’ positions and lines 14 – 17 renders a simple black line for all highways. Of course there are more options such as line thickness, style, and border.

Software and download

Smrender is written from scratch, completely in C. We don’t have any download location yet because the code needs some cleanup and a face lifting in places. We are also discussing licensing issues but we will probably release it under GPL within the next weeks.

Feel free to contact us if you have any questions!

28C3 useful Links

To make live easier if you’re attending the congress you may find the following information useful: Chat/IRC (yes irc is still not dead [ref. dan kaminsky’s talk day 1]): server is on freenode (use the client of your choice and issue “/server irc.freenode.net”) /join #28c3 Just in case the wiki server is down/unreachable again:

http://28c3.dhofer.com/events.ccc.de/index.html

Streaming:

`http://28c3.fem-net.de`

YouTube Channel: `http://www.youtube.com/28c3` ….

http://28c3.dhofer.com/events.ccc.de/index.html http://28c3.fem-net.de`: http://28c3.fem-net.de

http://www.youtube.com/28c3

28C3 News — Day 2.541

Day 2 hat super begonnen mit einem sehr interessanten und unterhaltsam aufbereiteten Talk zum Thema Politik hacken, ein Danke an die beiden Speaker Alexander und Montserat. Etwas ĂŒberrascht hat mich die Sache mit dem Bundestrojaner (der mit der ausgefeilten Crypto und dem genial Netzwerkprotokoll…), der auch in Österreich eingesetzt wurde. Naja, bei uns lĂ€uft der politische Hacktivismus leider noch etwas ruhiger ab als in Deutschland. Liegt das vielleicht daran, dass hier im Hintergrund mit mehr Schmiergeldern zwischen Medien und Politik gearbeitet wird?

Bin schon gespannt wie es weitergeht zum Thema NetzneutralitÀt gleich im Anschluss, dann Wep-App-DoS von @Alech und dann noch einiges aus der Sparte Society and Politics. Zur Prime Time gibts dann Roger Dingledine und Martin Haase.

Gestern Abend an Day 1 gabs dann noch Dan Kaminisky, immer wieder Spitze zum Zuhören.

 

28C3 News — Day 1.808

Nachdem wir gestern Abend angereist und noch ausgiebig das nicht enden wollende Sortiment an verschiedenen Biersorten in der Hostel-Bar getestet hatten, sind wir heute Vormittag im BCC angekommen. Die klassische Ticket-Warteschlange war nicht besonders lang und die Abfertigung ging ziemlich schnell, da anscheinend alle Kassen funktionierten und auch die QR-Code Scanner.

Wie jedes Jahr am Day 1 mussten wir uns einmal richtig akklimatisieren, d.h. unseren Projekttisch im Hackcenter in Beschlag nahmen, Switch verkabeln, Netzwerkkabel festgaffern, Notebooks auspacken, anschließen, Netzwerk testen, Smartphones vernetzen, Eventphone-SIM-Karte wieder aktivieren und Extension registrieren — sind unter 92900 erreichbar — und was man halt noch alles tun muss.
Hase hat seine SIM-Karte vergessen, naja, macht auch nix, ein Eventhandy reicht auch fĂŒr uns. Ich habe meine Kongressschlapfen im Hostel vergessen, Hos hat sich neue gekauft, das Headset liegt auch noch in der Reisetasche…

Das CCC-Wiki ist anfangs gleich mal fĂŒr mehrere Stunden ausgefallen, mittlerweile geht es aber wieder. War aber kein Problem, denn in Zeiten von Smartphones gibt es ja die Ă€ußerst geniale 28C3-Fahrplan-App. Der ganze Tag verlief bisher mit sehr angenehm mit einer Reihe guter Talks, im Zeichen des Überwachunsstaates. Sehr interessant und gut zusammengefasst war die Causa “0zapftis“.

Ansonsten ist der Kongress in Bezug auf die Menschenmenge sehr vertrĂ€glich und angenehm, liegt vermutlich an der neuen Methode der Ticketverteilung. Besonderer Hit ist natĂŒrlich der Falling-Mate-Ringtone und der Falling-Mate-Notification-Tone, auch wurde gleich im ersten Talk der  28C3 early bottle adaptor award vergeben.

Phenoelit-Area wurde nach draußen verlegt, der Raum im Keller wurde u.a. fĂŒrs Hardware-Hacking umfunktioniert. In der Kantine wird heuer Döner verkauft, auch mit Originalbedienung. Wer sich zum ersten Mal in der Kantine anstellt ist sofort durch planloses herumirren entlarvt, es gibt nĂ€mlich drei Schlangen, deren Anfang jedoch nicht so eindeutig zu erkennen ist, insbesonders wenn gerade Saalwechsel ist. Eine Queue fĂŒr die GetrĂ€nke, eine fĂŒr die warmen Speisen und eine fĂŒr den Dönerverkauft. GetrĂ€nke gibt’s jedoch wie immer auch bei den Speisen, wo man heuer Tickets fĂŒr die Burger bekommt, nachdem man sie bezahlt hat.

Eine ganze Menge Hardware-Hacking gibt es heuer auf dem Kongress, viele coole Projekte. Besonders interessant fand ich auch den alten Fernschreiber, dessen Schnittstelle auf RS232 umgebaut wurde und dem man SMS ĂŒber das Event-GSM schicken kann. Sehr Schade dass die Nummer des Event-GSM-Netzes nicht von österreichischen Mobil-Netzen erreichbar ist.

Sonst bisher alles sehr cool hier.

Waiting for 28C3

 

After a 10 hours trip with the train we arrived in Berlin to attend teh 28C3. For the few days we live in the great Sunflower hostel near Warschauer Straße. Now, we are warming up our  computers and smartphones. Fahrplan app installed *g*

Get an impression from the picture.

We, this is creo, fhasex20, and me (aka Rahra), members of the Austrian nerd association cyperpunk.at.

We hope that we got a desk in the hackcenter, because unfortunately we missed the deadline for project registrion in the 28C3 wiki. Well, shit happens, but maybe we’re lucky.

 

We will be around in the BCC, just contact as somehow (Email, Twitter, Facebook, what ever), or just have a look in the hackcenter or in the Phoenlit area.

Projects that we are currently working on is Anonymous DNS, and a completely new rendering software for OSM data.

Downloading Android Apps Part II — The 28C3 Fahrplan

Download Android apps (APK files) with your computer always sucks — again.
Today we arrived in Berlin to attend the 28C3, one of the best nerd congresses in Europe. And there’s a great app for Android by tuxmobil. Unfortunately, it’s just available in the Android market which requires registration 🙁

So, if you want to install it directly with ADB after downloading it from the Internet, just use this link:

http://www.cypherpunk.at/download/nerd.tuxmobil.fahrplan.congress-1.apk

Have fun!

HP-Compaq 2510p – soft keys not working

Since 2007 I own a HP 2510p Notebook. It is a great device. It’s very light, has good 12″ display, and it has a very low power consumption. I ever ran Debian Linux on it, currently Debian Squeeze, Kernel 2.6.32-5-amd64 and KDE 4 desktop.

The soft keys did work also but at any time they stopped to work. I’m not sure but I think that this is some kind of software bug because the the LEDs still work if the keys are pressed, and for whatever reason they do work sometimes. However, there’s a big problem. If you close the lid the notebook will go into standby mode. For whatever reason the touchpad will be disabled. And this is really bad because you cannot activate it again if the soft keys do not work.

Usually I don’t close the lid since standby mode doesn’t work reliably, anyway. IMO standby mode sucks on most notebooks.

One time I deactivated the Wifi by pressing the “RF kill switch” (wireless soft key) but I was unable to activate it again because the key didn’t work later. Maybe there’s just a loose contact inside.

However, it is a pain in the ass without Wifi and a touchpad 😉

I updated the BIOS but it didn’t solve the problem. I also didn’t find any software which lets me enable it again. Thus I think that the enable/disable function is built-in into hardware. The solution was easy but it was hard to find it.

Reboot the notebook and enter the BIOS setup by pressing F10. Now go to “System Configuration > Built-in Device Options” and disable all devices. Save the changes and exit the setup and reenter it again after reboot. Go again into the Built-in Device Options menu and enable all devices again. That’s all!

Note that the touchpad is not listed in the menu but this trick does work, anyway. Probably there’s a software bug behind or the software is written unclean.