doomclaw.de

There are some howtos on the internet decribing how to convert a vCard based address book to LDIF, so you can import it into Claws mail personal address book. All of these use an online converter, which seemed a little bit dangerous to me, since I don’t know what the server does with my address book data aside from converting it.

But there is a much simpler way.

When you open your address book you can just go to “Book -> New vCard” and specify the path to your vCard-File in the File-field. This will create a new entry under “vCard” in your address book. All you have to do now is to copy all entries to your personal address book by dragging and dropping them. Afterwards you can delete created vCard by selecting it and clicking “Book -> Delete book”.

That’s all! Pretty easy, huh?

Some time ago I bought a Brother MFC-5490CN printer knowing that Brother provides Linux drivers for this device. Since I’m using mostly FreeBSD systems I spent some time to get that printer running on my systems. Finally I did it. Here’s how I did this:

First you need to ensure that you have print/a2ps-a4, print/a2ps-letter installed.

Then download the filter drivers for Linux from Brother. I used the .deb-Archives and extracted them to a temporary directory.
The Linux driver is installed under /usr/local, but I don’t liked that so I created a separate directory in the opt-tree.

mkdir -p /opt/brother/mfc5490cn

And copied the two important directories from the Linux drivers over to that directory. These are the lpd and inf directories in the data part of the .deb-Archive.

cp -R /tmp/brmfc5490cn/data/lpd /opt/brother/mfc5490cn/
cp -R /tmp/brmfc5490cn/data/inf /opt/brother/mfc5490cn/

Since I changed the paths to these files I had to change these within the filter driver. Edit /opt/brother/mfc5490cn/lpd/filtermfc5490cn and change the BR_PRT_PATH variable to:

BR_PRT_PATH=/opt/brother/${PRINTER}

Then you need to edit the /opt/brother/mfc5490cn/lpd/psconvertij2 file, since there is a ambiguous sed command. You need to find the line saying:

RESOLUTION=`sed -n '/\<Resolution/p' $RC_FILE`

And change it to:

RESOLUTION=`sed -n '/^Resolution/p' $RC_FILE`

In my case I also had to change the /opt/brother/mfc5490cn/inf/brmfc5490cnrc file to make the printer use A4 instead of Letter format. Change the line:

PaperType=Letter

To:

PaperType=A4

Finally You just need to setup your /etc/printcap. Just paste the following lines and change the hostname in the rm line:

mfc5490cn:\
        :mx=0:\
        :sd=/var/spool/lpd/mfc5490cn:\
        :sh:\
	:rm=gutenberg:\
	:rp=lp:\
        :if=/opt/brother/mfc5490cn/lpd/filtermfc5490cn:\
#	:lf=/var/log/spool.log:

If you run into trouble just set the lf line active and run the following commands:

touch /var/log/spool.log
chown daemon:wheel /var/log/spool.log

If you need more output from the filter just write a set -x line in the /opt/brother/mfc5490cn/lpd/filtermfc5490cn and /opt/brother/mfc5490cn/lpd/psconvertij2 files. The output will be logged to the spool.log.

I’m running a FreeBSD server at home. Since I wanted to save some energy I decided to turn it off when all clients are diconnected and turn it on again when a client starts up. So here is how I did this.

I’ve got a Linksys WRT54GL running OpenWRT for DHCP, DNS and wireless access. OpenWRT uses dnsmasq for serving DHCP and DNS and therefore is capable of executing a custom program when giving a lease to a client computer.

You just need to edit the /etc/dnsmasq.conf and add a line like this:

dhcp-script=/bin/serverwakeup

The file /bin/serverwakeup is a simple shell script containing the following lines:

#!/bin/sh
sleep 10
hosts_up=`egrep -c 'edison|newton' /var/dhcp.leases` # change clients names

if [ $hosts_up -ge 1 ]; then
        wol xx:xx:xx:xx:xx:xx # put MAC address of your server here
fi

Since I wanted to start the server only if specific clients are started I decided to filter for the wanted clients before running the WOL functionality. I’m filtering this in the leases file of dnsmasq. The script will wait for 10 seconds after being invoked,so that dnsmasq got more than enough time to write the /etc/dhcp.leases. When you take a look at this file you will find all active leases including the corresponding hostnames. The clients I wanted are named ‘edison’ and ‘newton’. So the script looks for these names in the leases file and counts the number of occurences. When the count is greater or equal 1, the WOL command is invoked.

To shutdown the server after the last client disconnects I placed the follwing script on my server:

#!/bin/sh
scp root@popow /var/dhcp.leases /tmp/
hosts_up=`egrep -c 'edison|newton' /tmp/dhcp.leases` # change clients names
rm /tmp/dhcp.leases
if [ $hosts_up -lt 1 ]; then
        acpiconf -s 4
fi

This script does nearly the same as the script above.It checks the leases file on the OpenWRT router (named ‘popow’) and checks for the clients. If the value of leases fo these clients is less than 1 it invokes the supend command (acpiconf -s 4), which puts the server in S4 state (supend-to-disk).
This script needs to be invoked from time to time to check for the hosts. So I created a cronjob by adding the following lines to /etc/crontab.

#
# Suspend to disk when no other valuable host is online anymore
*/5     *       *       *       *       root    /usr/local/bin/suspender

Update:
I’ve slightly updated the suspender script to reduce the load on the router. The server doesn’t use the router resources to check the leases file anymore. Instead it gets the file from the router, checks it by itself and deletes it afterwards.

Two other things I’ve missed to mention:

• You need to have the wol-Package installed on your WRT (opkg install wol).
• You need to have the public SSH key of your server in the authorized_keys file of your router.

What?

This is a guide on how to install Windows 7 using a syslinux-based PXE server.

Why?

Since I got a ThinkPad X61 Tablet and no X6 Tablet Ultrabase or any other external DVD drive I have to install every operating system on this laptop with USB flash drives or, and this is the prettier way, over my home network. To accomplish this I’ve set up a PXE server for all the Linuxes I use. But I still had to use CD’s and DVD’s for installing Windows.

There are some ways to install Windows XP through PXE but the problem with these solutions is that you will need a Windows Server machine for this. You could also use a Linux machine with a PXE server running and boot into a memdisk with the installation disc image loaded. But the PXE booted memdisk will only take up to 500MB of data and every (not modified) XP image is larger than this.

With the release of Windows Vista Microsoft released a new version of their Preinstallation Environment which is said to work better on Linux PXE servers. There are some howtos about this on the net but I never tried this.

Now with the upcoming release of Windows 7 there will be another new version of Windows PE. This guide will show how to accomplish the task of using Windows PE 3.0 with a syslinux-based PXE environment.

What will you need?

• A working PXE boot server with syslinux (there are plenty of howtos, just google them). If you plan to use a Linux server as I did, I would recommend to use tftpd-hpa because it supports path remappings. Without these remappings the TFTP server won’t find the correct paths in your filesystem, because some paths are hardcoded.
• An image of your Windows 7 Installation disc (I’ve just used the images I downloaded from MSDN)
• The Windows Automated Installation Kit (AIK) for Windows 7 (Download)
• A working Windows-based computer (I have used an installation of Windows XP in VirtualBox)

How?

1. Run the Windows AIK Setup on your Windows computer.
2. Start the Deployment tools command prompt.
3. Run the following shell script. It will prepare your Windows bootloader for usage with PXE. There are some variables set in the lines 5-17. You can change them to your favor.

   @echo off
   cls
   
   REM Variables
   echo Setting variables ...
   REM the path to your WAIK installation
   set WAIKPath=%ProgramFiles%\Windows AIK
   echo Set WAIK directory to %WAIKPath%.
   REM possible values are: x86, amd64 and ia64
   set ARCH=x86
   echo Set architecture to %ARCH%.
   set PEPath=C:\winpe_%ARCH%
   echo Set temporary working directory for Windows PE to %PEPath%.
   set TFTPPath=C:\tftp\Boot
   echo Set TFTP boot directory to %TFTPPath%.
   REM Don't change this one!
   set BCDStore=%TFTPPath%\BCD
   echo Set BCD store to %BCDStore%.
   echo All variables set!
   echo.
   
   REM Environment check
   echo Checking for clean environment...
   if not exist "%WAIKPATH%" set NoWAIK=1 && goto :end
   if not exist "%WAIKPath%\Tools\PETools\%ARCH%" set NoARCH=1 && goto :end
   if exist %PEPath% echo Temporary working directory not empty! Need to remove && rd %PEPath% /S
   if exist %PEPath% echo Temporary working directory still not empty! Trying again ... && cd "%WAIKPath%\Tools\%ARCH%" && imagex /unmount %PEPath%\mount && rd %PEPath% /S /Q
   if exist %PEPath% set NotClean=1 && goto :end
   if exist %TFTPPath% echo TFTP boot directory not empty! Need to remove && rd %TFTPPath% /S
   if exist %TFTPPath% set NotClean=1 && goto :end
   if exist %BCDStore% echo BCD store existing! Need to remove && del /P %BCDStore%
   if exist %BCDStore% set NotClean=1 && goto :end
   echo.
   
   REM WORK!
   echo Starting real work now ...
   cd "%WAIKPath%\Tools\PETools"
   echo Copying PE-Files ...
   call copype %ARCH% %PEPath%
   echo Mounting Windows PE image ...
   imagex /mountrw %PEPath%\winpe.wim 1 %PEPath%\mount
   md %TFTPPath% > NUL
   copy %PEPath%\mount\Windows\Boot\PXE\*.* %TFTPPath% > NUL
   copy "%WAIKPath%\Tools\PETools\%ARCH%\boot\boot.sdi" %TFTPPath% > NUL
   copy %PEPath%\winpe.wim %TFTPPath% > NUL
   cd %PEPath%\mount\Windows\System32
   bcdedit -createstore %BCDStore%
   bcdedit -store %BCDStore% -create {ramdiskoptions} /d "Ramdisk options"
   bcdedit -store %BCDStore% -set {ramdiskoptions} ramdisksdidevice  Boot
   bcdedit -store %BCDStore% -set {ramdiskoptions} ramdisksdipath  \Boot\boot.sdi
   for /f "Tokens=3" %%i in ('bcdedit /store %BCDStore% /create /d "Windows 7 Install Image" /application osloader') do set GUID=%%i
   bcdedit -store %BCDStore% -set %GUID% systemroot \Windows
   bcdedit -store %BCDStore% -set %GUID% detecthal Yes
   bcdedit -store %BCDStore% -set %GUID% winpe Yes
   bcdedit -store %BCDStore% -set %GUID% osdevice ramdisk=[boot]\Boot\boot.wim,{ramdiskoptions}
   bcdedit -store %BCDStore% -set %GUID% device ramdisk=[boot]\Boot\boot.wim,{ramdiskoptions}
   bcdedit -store %BCDStore% -create {bootmgr} /d "Windows 7 Boot Manager"
   bcdedit -store %BCDStore% -set {bootmgr} timeout 30
   bcdedit -store %BCDStore% -set {bootmgr} displayorder %GUID%
   bcdedit -store %BCDStore%
   pause
   goto :exit
   
   :end
   if %NoWAIK%=1 echo "Your WAIK directory was not found. Execution aborted." && pause && goto :exit
   if %NoARCH%=1 echo "Your Architecture doesn't seem to be right. Or at least it is not known by your WAIK installation. Execution aborted." && pause && goto :exit
   if %NotClean%=1 echo "Your environment was not clean. Execution aborted." && pause && goto :exit
   
   :exit

4. If nothing went wrong you should have some files in the directory which is set in the TFTPPath variable. Copy these files into a subdirectory of your TFTP servers boot directory. In my case this is /var/lib/tftpboot.
   If you’re not using tftpd-hpa you should place all files into a subdirectory called “Boot”. This is very essential.
   If you’re using tftpd-hpa you can place it in any subdirectory you want to, because you can remap the paths. I chose /var/lib/tftpboot/windows/7.For the remapping we need to do some extra steps:
   1. Create a remapping file called /var/lib/tftpdboot/tftpd.remap with the following content (change paths to your needs):

      re ^pxeboot\.n12 windows/7/pxeboot.n12
      re ^pxeboot\.com windows/7/pxeboot.com
      re ^pxeboot\.0 windows/7/pxeboot.n12
      re ^bootmgr\.exe windows/7/bootmgr.exe
      r ^\\Boot\\ windows/7/
      r ^\\boot\\ windows/7/
      r ^Boot/ windows/7/
      r ^/Boot/ windows/7/
      r ^boot/ windows/7/
      r ^/boot/ windows/7/
      r ^\\ windows/7/
      rg \\ /

   2. Edit your tftpd-hpa configuration in /etc/default/tftpd-hpa to parse the remappings:

      #Defaults for tftpd-hpa
      RUN_DAEMON="yes"
      OPTIONS="-l -m /var/lib/tftpboot/tftpd.remap -s /var/lib/tftpboot -vvv"

      The -vvv part is optional, but highy recommended to get the most verbose output in /var/log/syslog.

5. Now you’ll need to create some symbolic links in your Windows boot directory.

   ln -s pxeboot.n12 startrom.0
   ln -s winpe.wim boot.wim

6. To map the Image in your pxelinux menu just edit your pxelinux config and add the following lines:

   LABEL win7
           MENU LABEL Windows 7
           KERNEL Boot/startrom.0

7. Because the boot image is just a Windows PE image with a minimal shell you’ll need to make your installation source accessible over your network. For this I’ve just created a guest-readable samba share on the same server where my PXE server resides.
   You’ll need to copy the content of the sources directory on your installation media into this share.
8. The configuration is done. Let’s try to install Windows 7. Start your target computer, boot into your PXE menu and choose the Windows 7 menu point. When the system is completely booted you should get the mentioned Windows shell. To connect to your installation share and start the stup just type the following commands (where the text in squared brackets should be replaced with the appropriate data):

   net use y: \\[IP of your share server]\[name of your share]
   y:
   setup.exe

That’s all the installation of windows 7 should start now.

Additional notes:

• It is not possible to run a x86 Windows PE and start an amd64 installation from this. If you plan to install an amd64 System but only got an x86 system to do the configuration (or vice versa) you might run into errors. In this case just configure the installation source for the architecture you’re currently using. At the end you can just copy the winpe.wim you would like to use from %ProgramFiles%\Windows AIK\Tools\PETools\%ARCH% into your source and overwrite the old one.
  You can also place both files in your source directory and just change the symlink to the right file. This is the way I did it. The last option is to create a second entry in the PE boot loader with bcdedit. But this caused my boot loader to have two entries, both named “Ramdisk options” but pointing to different images (x86 and amd64). This could be confusing if you don’t remember which entry entry is for x86 or amd64.
• If you plan to use a Windows based PXE server for the installation I recommend tftpd32. I have not tried this way but the most how-to’s for installing Windows Vista by PXE recommend this one. You need to set pxeboot.com as boot file, you can skip the steps 5 and 6 and you’ll have to rename the winpe.wim to boot.wim.
• Maybe it’s possible to load the Installation image of Windows 7 directly. It’s located in the sources directory of your installation media and is named install.wim. But you’ll definitely need much RAM for this, because both images, x86 and amd64, are over 2GB in size. I was not able to try this because my laptop only got 2GB RAM, so the boot loader blocked loading of an image of this size. But I’m not sure if the error message derived from my amount of RAM or if there was another error while using this image.
• This guide should work for Windows Vista as well or at least the steps should be very similar.

Thanks to…

• Joshua Flanagan for his excelent guides [1] [2] to accomplish this with Windows Vista and tftpd32.
• Gernot Stöckl for some ideas I derived from his Wiki.

Any comments, additions and corrections are greatly appreciated.

I’m using ZNC on a Debian GNU/Linux server as irc bouncer. One thing that always bothered me was, that ZNC was not started by default when the server was restarted. This is due to the design to be started by a user. Since I don’t wanted to run it with an existing user on this server nor to add a new user which is capable of logging in to the server I’ve set up ZNC to run daemonized by a designated system user.

How?

1. Install znc as normal.

   apt-get install znc

2. Configure znc as normal with your normal user account but don’t start it at the end of the configuration.

   znc --makeconf

3. Substitute to root and create a new configuration directory for znc in /etc and move your newly created configuration to this directory. After this you can delete the /home/$USER/.znc diretory.

   mkdir /etc/znc
   mv /home/$USER/.znc/* /etc/znc/
   rm -R /home/$USER/.znc

4. Add a new systemgroup and -user for znc.

   addgroup --system znc
   adduser --system --no-create-home --ingroup znc znc

5. Set the appropriate rights for the configuration directory.

   chown -R znc:znc /etc/znc

6. Now you’ll need to create an init script for znc. You can either use the /etc/init.d/skeleton as base and rewrite it to your needs or you can take my init script and place it as znc in /etc/init.d/.

   #! /bin/sh
   ### BEGIN INIT INFO
   # Provides:          znc
   # Default-Start:     2 3 4 5
   # Default-Stop:      0 1 6
   # Short-Description: znc initscript
   # Description:       This is the init-Script for znc.
   ### END INIT INFO
   
   # Author: Henner M. Kruse 
   #
   # Please remove the "Author" lines above and replace them
   # with your own name if you copy and modify this script.
   
   # Do NOT "set -e"
   
   # PATH should only include /usr/* if it runs after the mountnfs.sh script
   PATH=/sbin:/usr/sbin:/bin:/usr/bin
   DESC="znc, an advanced modular IRC bouncer"
   NAME=znc
   DAEMON=/usr/bin/$NAME
   DAEMON_ARGS="-d /etc/znc"
   PIDFILE=/var/run/$NAME.pid
   SCRIPTNAME=/etc/init.d/$NAME
   USER=znc
   GROUP=znc
   
   # Exit if the package is not installed
   [ -x "$DAEMON" ] || exit 0
   
   # Read configuration variable file if it is present
   [ -r /etc/default/$NAME ] && . /etc/default/$NAME
   
   # Load the VERBOSE setting and other rcS variables
   . /lib/init/vars.sh
   
   # Define LSB log_* functions.
   # Depend on lsb-base (>= 3.0-6) to ensure that this file is present.
   . /lib/lsb/init-functions
   
   #
   # Function that starts the daemon/service
   #
   do_start()
   {
   	# Return
   	#   0 if daemon has been started
   	#   1 if daemon was already running
   	#   2 if daemon could not be started
   	start-stop-daemon --start --quiet --chuid $USER:$GROUP --pidfile $PIDFILE --exec $DAEMON --test > /dev/null \
   		|| return 1
   	start-stop-daemon --start --quiet --chuid $USER:$GROUP --pidfile $PIDFILE --exec $DAEMON -- \
   		$DAEMON_ARGS \
   		|| return 2
   	# Add code here, if necessary, that waits for the process to be ready
   	# to handle requests from services started subsequently which depend
   	# on this one.  As a last resort, sleep for some time.
   }
   
   #
   # Function that stops the daemon/service
   #
   do_stop()
   {
   	# Return
   	#   0 if daemon has been stopped
   	#   1 if daemon was already stopped
   	#   2 if daemon could not be stopped
   	#   other if a failure occurred
   	start-stop-daemon --stop --quiet --retry=TERM/30/KILL/5 --chuid $USER:$GROUP --pidfile $PIDFILE --name $NAME
   	RETVAL="$?"
   	[ "$RETVAL" = 2 ] && return 2
   	# Wait for children to finish too if this is a daemon that forks
   	# and if the daemon is only ever run from this initscript.
   	# If the above conditions are not satisfied then add some other code
   	# that waits for the process to drop all resources that could be
   	# needed by services started subsequently.  A last resort is to
   	# sleep for some time.
   	start-stop-daemon --stop --quiet --oknodo --retry=0/30/KILL/5 --chuid $USER:$GROUP --exec $DAEMON
   	[ "$?" = 2 ] && return 2
   	# Many daemons don't delete their pidfiles when they exit.
   	rm -f $PIDFILE
   	return "$RETVAL"
   }
   
   #
   # Function that sends a SIGHUP to the daemon/service
   #
   do_reload() {
   	#
   	# If the daemon can reload its configuration without
   	# restarting (for example, when it is sent a SIGHUP),
   	# then implement that here.
   	#
   	start-stop-daemon --stop --signal 1 --quiet --pidfile $PIDFILE --chuid $USER:$GROUP --name $NAME
   	return 0
   }
   
   case "$1" in
     start)
   	[ "$VERBOSE" != no ] && log_daemon_msg "Starting $DESC" "$NAME"
   	do_start
   	case "$?" in
   		0|1) [ "$VERBOSE" != no ] && log_end_msg 0 ;;
   		2) [ "$VERBOSE" != no ] && log_end_msg 1 ;;
   	esac
   	;;
     stop)
   	[ "$VERBOSE" != no ] && log_daemon_msg "Stopping $DESC" "$NAME"
   	do_stop
   	case "$?" in
   		0|1) [ "$VERBOSE" != no ] && log_end_msg 0 ;;
   		2) [ "$VERBOSE" != no ] && log_end_msg 1 ;;
   	esac
   	;;
     #reload|force-reload)
   	#
   	# If do_reload() is not implemented then leave this commented out
   	# and leave 'force-reload' as an alias for 'restart'.
   	#
   	#log_daemon_msg "Reloading $DESC" "$NAME"
   	#do_reload
   	#log_end_msg $?
   	#;;
     restart|force-reload)
   	#
   	# If the "reload" option is implemented then remove the
   	# 'force-reload' alias
   	#
   	log_daemon_msg "Restarting $DESC" "$NAME"
   	do_stop
   	case "$?" in
   	  0|1)
   		do_start
   		case "$?" in
   			0) log_end_msg 0 ;;
   			1) log_end_msg 1 ;; # Old process is still running
   			*) log_end_msg 1 ;; # Failed to start
   		esac
   		;;
   	  *)
   	  	# Failed to stop
   		log_end_msg 1
   		;;
   	esac
   	;;
     *)
   	#echo "Usage: $SCRIPTNAME {start|stop|restart|reload|force-reload}" >&2
   	echo "Usage: $SCRIPTNAME {start|stop|restart|force-reload}" >&2
   	exit 3
   	;;
   esac
   
   :

7. Now it’s time to run znc with this script. But first you’ll need to make it executable.

   chmod +x /etc/init.d/znc
   /etc/init.d/znc start

   You’ll be asked two questions at the first run. Just answer them and they’ll be gone the next time.

   [ ?? ] Would you like to create a new pem file? (yes/no) [yes]: yes
   [ ?? ] hostname of your shell (including the '.com' portion): domain.com

8. Now let’s just check if znc is running fine and with the correct user.

   ps -aux | grep znc

   This should produce an output like this:

   znc      26501  0.0  0.5   5864  1680 ?        Ss   10:06   0:00 /usr/bin/znc -d /etc/znc

9. If your ZNC daemon started correctly, you can tell your system to start it when your system starts with the following command

   update-rc.d znc defaults