I recently wanted to check which servers on a large sub-net was listening on port 22/tcp.

Now nmap is obviously the tool to use, but the output was very long, and not all that clear. Here is a quick one liner I did, and maybe some one else can use this as well.

$ nmap -P0 -sT -p22 10.0.102.0/23 | perl -e 'while(<>){ chomp; push( @l, $_ ); } $lc = -1; foreach $t ( @l ) { $lc++; if( $t =~ /Interesting ports on (\d+\.\d+\.\d+\.\d+)/ ) { $ip = $1; $nlc = $lc + 2; if( $l[$nlc] =~ /open/ ) { print "IP: $ip\t\t$l[$nlc]\n"; } } }'
IP: 10.0.102.3                22/tcp open  ssh
IP: 10.0.102.4                22/tcp open  ssh
IP: 10.0.102.5                22/tcp open  ssh
IP: 10.0.102.54               22/tcp open  ssh
IP: 10.0.102.57               22/tcp open  ssh
IP: 10.0.102.58               22/tcp open  ssh
IP: 10.0.102.59               22/tcp open  ssh
IP: 10.0.102.69               22/tcp open  ssh
IP: 10.0.102.250              22/tcp open  ssh
IP: 10.0.102.251              22/tcp open  ssh
IP: 10.0.103.54               22/tcp open  ssh
IP: 10.0.103.57               22/tcp open  ssh
IP: 10.0.103.58               22/tcp open  ssh
IP: 10.0.103.59               22/tcp open  ssh
IP: 10.0.103.69               22/tcp open  ssh

A while back I introduced myself, as well as one of the projectes that I am busy playing with. The project's name is LAMPAS, and is available from SourceForge.

I have just released version 0.005 which is now available for download.

This has been a great learning experience in Apache and mod_perl, and although I am still only scratching the surface, I am very happy with what I have learned. Although some have been advising against mod_perl on Apache 2.2.2, I have succesfully compiled the two packages and have not run into major problems yet, except that I can not yet seem to find an alternative to Apache::DBI but this is so far only a minor set-back. The Apache::DBI documentation notes that "Apache::DBI version 0.90_02 and later might work under mod_perl 2.0. See the Changes file for more information. Beware that it has only been tested very lightly." - so it seems I might be the tester for Apache 2.2.2 and mod_perl here :)

My build and testing steps are documented at the LAMPAS project page. Feel free to play around. LAMPAS 0.005 is based on this build, so I am not sure how it will behave on other builds.

I will now start to focus on building the actual management interface, so hopefully releases will become more frequent. One frustrating part for me was a combination of long delays with major redesign changes between the 0.004 and 0.005 release. It might not be that aparent once you poke around the directory structure, but belief me - I changed my mind a couple of times after reading some mod_perl documentation, getting advice and trying out stuff.

Well, that's it for now. BTW: Do you belief I should make Apache 2.2.2 and mod_perl available as .deb packages? Will anybody here be interested in these packages?

Cheers

I had some trouble installing VMWare WS 5.0.0 build 13124 on Dapper, but eventually got it up and running.

I have posted some notes about this on on my personal blog for those interested.

You can try this:

# cat /etc/passwd | perl -e 'while(<>){ chomp; @f=split(/:/,$_); if( ( $f[0] eq "root" ) || ( $f[2] > 999 ) ) { $c="crontab -l -u " . $f[0]; $r=`$c`; print "USER: ",$f[0],"\n----\n\n$r\n\n"; } }'

In general, excluding anything in a *bin* directory:

# find / -type f -ls | sort -k 7 -r -n | grep -v '/bin' | head

Then, to really only exclude executables:

# find / -type f -not -perm -g=x,-o=x -ls | sort -k 7 -r -n | head

# find / -type f -perm -g=x,-o=x -ls | sort -k 7 -r -n | head

Have fun

I finally have some time to contribute again...

There are many tools to mirror a site, and the most common is almost certain to be wget(1). The problem with these programs - CLI or GUI - is all the options available. In my case, I rarely have to fidle with the options. So, I created a simple brain-dead wrapper script to quickly grab an mirrir a directory from a web server:

#!/bin/sh

# mirror a site tool => ms.sh
# -        -

# usage:
#
#       ms.sh BASEDIR URL 
#
# What this program will do is to create (mkdir) the 'basedir' and then
# run 'wget' in a mirror mode to dump the site in that directory. After
# the download is complete, the script will write the source URL in a
# file called source.txt.
#
MKDIR=/bin/mkdir
WGET=/usr/bin/wget
ECHO=/bin/echo

$MKDIR -p $1
cd $1
$WGET -t 0 -nc -c -x -nH -r -l 5 -k -p -L -np $2
$ECHO $2 > $1/source.txt

$ECHO '\nOperation Completed...\n\n'

Have fun...

This was rather interesting, but something I would like to add for us Debian admins is the start-stop-daemon(8).

With this little gem it is very easy to write your own startup scripts.

Here is my skeleton startup script:

#! /bin/sh

# /etc/init.d/jboss: start and stop the jboss daemon

SSD=/sbin/start-stop-daemon
ECHO=/bin/echo
TEST=/usr/bin/test
HOSTNAME=`/bin/hostname`
MYAPP=/path/to/app
MYAPPNAME=app

$TEST -x $MYAPP || exit 0

case "$1" in
  start)
        $ECHO -n "Starting $MYAPPNAME: $MYAPP"
        $SSD -c myusername --start -b --quiet -p /var/run/app.pid -m --exec /path/to/app
        $ECHO "."
        ;;
  stop)
        $ECHO -n "Stopping $MYAPPNAME: $MYAPP"
        $SSD --stop -p /var/run/app.pid
        $ECHO "."
        ;;

  *)
        $ECHO "Usage: /etc/init.d/$MYAPPNAME {start|stop)"
        exit 1
esac

exit 0