RIGO.INFO TechBlog
Eventually I get into producing something I think is useful for others. You'll find random technical knowledge in this Blog so please be patient and use the search function. Some of these software are rather lame and old, the list is ordered by the approximate age (newest first). Unfortunately my older stuff are lost or scattered around my old CDs, not readable anymore 8(.
KopKop
kopkop_0.1.0-1.tar.gz - Stealthy and secure remote command triggering for IP networks. The kopkop daemon listens for encrypted, signed and fully random-looking command packets. Only the fields essential for the packets' travel trough the internet are filled with 'sane' data. Upon reception and after a preset timeout it executes user defined commands. This could be used to open firewalls, allow hosts, etc., so one can reduce your system's attack surface by hiding services like 22/tcp ssh or 1000/tcp webmin. The packet sending mechanism a.k.a. the kopkop client is also included. The communication is strictly unidirectional and quite minimal between the client and the server altough random padding is used to spread the packet size between 120bytes and 8Kbytes. Replay attacks are forestalled by storing and comparing monotoneously increasing packet ids on both sides.
Installing Debian Lenny and OpenVZ on an IBM xSeries
Recently I had the opportunity to install Lenny and OpenVZ on a bigger chunk of metal. You can read my full guide here.
Freemind to WikiMedia
Here you can find a modifyed version of freemind2wiki that converts freemind files to wikimedia markup.
<?xml version="1.0"?> <xsl:stylesheet version="1.0" xmlns:xsl="http://www.w3.org/1999/XSL/Transform"> <xsl:output method="text"/> <xsl:template match="/"> <xsl:apply-templates/> </xsl:template> <xsl:template name="linebreak"> <xsl:text> </xsl:text> </xsl:template> <xsl:template match="map"> <xsl:apply-templates select="child::node"/> </xsl:template> <xsl:template match="node"> <xsl:param name="commaCount">0</xsl:param> <xsl:if test="$commaCount > 0"> <xsl:call-template name="writeCommas"> <xsl:with-param name="commaCount" select="$commaCount"/> </xsl:call-template> </xsl:if> <xsl:value-of select="@TEXT"/> <xsl:call-template name="linebreak"/> <xsl:apply-templates select="child::node"> <xsl:with-param name="commaCount" select="$commaCount + 1"/> </xsl:apply-templates> </xsl:template> <xsl:template name="writeCommas"> <xsl:param name="commaCount">0</xsl:param> <xsl:if test="$commaCount > 0">*<xsl:call-template name="writeCommas"> <xsl:with-param name="commaCount" select="$commaCount - 1"/> </xsl:call-template> </xsl:if> </xsl:template> </xsl:stylesheet>
Convert Video DVD or ISO to VOB using MPlayer
My custom iso2vob bash shell script to convert video DVD to VOB editable by Avidemux using MPlayer.
#!/bin/bash info=`mplayer -ao null -vo null -frames 1 -identify -dvd-device "$1" dvd://` if [ "$2" ]; then titles="$2" titles_num=`echo "$titles" | wc -w` else titles=`echo -e "$info" | egrep "ID_DVD_TITLE_[0-9]+_LEN" | cut -f 4 -d'_' | sort -n` titles_num=`echo -e "$titles" | wc -l` fi function dvdlabel() { dd if="$1" count=1 bs=1024 skip=32 2>/dev/null | cut -b 41-72 | sed 's/[^[:alnum:]]._ -]+//g' | sed 's/^ *//g' | rev | sed 's/^ *//g' | rev } tmp=`mktemp -d` mkfifo $tmp/fifo if [ -b "$1" ]; then echo "source type: block device" label=`dvdlabel "$1"` of="dvd.$label."`date +%s` elif [ -f "$1" ]; then echo "source type: file" label=`dvdlabel "$1"` filename=`basename "$1"` of="$filename.$label.iso2vob" else echo "error: source type unknown" exit 0 fi echo "output dir: $of" mkdir -p "$of" mkdir -p "$tmp/mnt" if [ -b "$1" ]; then echo "mounting source: block device" sudo mount -t iso9660 "$1" "$tmp/mnt" elif [ -f "$1" ]; then echo "mounting source: file" sudo mount -o loop -t iso9660 "$1" "$tmp/mnt" else echo "error: source type unknown" exit 0 fi find "$tmp/mnt" | egrep -vi 'VOB$' | while read file; do cp -v "$file" "$of"; done sudo umount "$tmp/mnt" rm -f "$tmp/mnt" echo "grabbing $titles_num titles..." of="$of/$of" for x in $titles; do num=`printf '%02i' $x` echo "dumping track $x..." mplayer $2 $3 $4 $5 $6 $7 $8 $9 -ao null -vo null -dvd-device "$1" dvd://$x -dumpfile $tmp/fifo -dumpstream 2>/dev/null 1>/dev/null & pv $tmp/fifo > "$of".$num.vob done rm -rf $tmp
Check files for holes
It's quite hard to tell if a file under Linux has holes (eg. it is a sparse file). This script tries to determine this by comparing apparent and real file sizes.
#!/bin/sh where=${1:-.} find "$where" -type f | while read file; do # apparentsize=`du --apparent-size "$file" | cut -f 1` # realsize=`du "$file" | cut -f 1` blocks=`stat -c "%b" "$file"` blocksize=`stat -c "%B" "$file"` realsize=$(($blocks * $blocksize)) apparentsize=`stat -c "%s" "$file"` diff=$(($apparentsize < $realsize)) if [ $diff -eq 0 ]; then echo [has holes?] $file [real:${realsize} apparent:${apparentsize}] hole='found' fi done if [ -z $hole ]; then echo "no hole candidates found" fi
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