path: root/machine-update-beta

#!/usr/bin/perl -w
# For Emacs: -*- mode:cperl; mode:folding; -*-
#
# Get a machine's critical features, And mail/http them to the Linux Counter
#
# (c) 1999 - Harald Tveit Alvestrand, the Linux Counter Project
#     2003 - PetaMem Group (www.petamem.com)
# License:   GNU Copyleft - see bottom of file.
# Changelog: see even more bottom of the file
#
# As a matter of courtesy, if you change this file on your own,
# make sure it does NOT mail to the counter!
#
use strict;
use POSIX;

our $VERSION     = '0.20';
our $CVS_VERSION = '$Revision: 1.1 $ $Date: 2005-03-11 16:57:22 $ $Author: jonas $';
our $IsInTestHarness;
use vars qw(%values %oldvalues $errordata $debugdata); # data that is sent
use vars qw($progname %option);
use vars qw(%is_sys_account %is_user %is_account);

# Some variables are for internal use, and never prompted for in
# the loop of askquestions
our %dontask = ('uniqueid' => 1,    # Internal use
        'manual'   => 1,
        'method'   => 1,
        'owner'    => 1,    # These 2 are always prompted for
        'key'      => 1,
        'uptime'   => 1,    # We think we know how to get these
           );

# stuff that controls defaults for passwdscan & accounts subroutines
my ($UID_MIN, $UID_MAX, $got_defs) = (100, 65533, '');

# Make sure nothing happens, so that the script's routines
# can be debugged from another file
return 1 if($IsInTestHarness);

&preparation;
&options;

&readfile;
&checkconfig;

if ($option{ask}) {
  &askquestions;
} else {
  &copymanuals;
}

&writefile;
&sendfile;

# {{{ preparation

#
sub preparation {
  die "No HOME environment variable\n" if (!$ENV{HOME});
  die "No home diretory\n" if ! -d $ENV{HOME};
  my $infodir = "$ENV{HOME}/.linuxcounter";
  if (! -d $infodir) {
    mkdir($infodir, 0766) || die "Unable to make $infodir\n";
  }
  # Keep track of where I am; need it to install crontab entry
  # progname is a global.
  $progname = $0;
  if ($progname !~ /^\//) {
    my $progdir = `pwd`;
    chop $progdir;
    $progname = "$progdir/$progname";
    $progname =~ s!/./!/!;
  }
  chdir($infodir) || die "Unable to change to $infodir\n";
  my ($sysname, $nodename, $release, $version, $machine ) = POSIX::uname();
  if (! -f $nodename) {
    print STDERR "Machine-update $VERSION. Use $0 -l to display license.\n";
    print STDERR "Creating the infofile for your computer.\n";
    # Create the infodir
    open(INFO, ">$nodename");
    print INFO "uniqueid: ", randomnumber(), "\n";
    close INFO;
  }

  srand time % $$;            # do some seed "randomization"
}

# }}}
# {{{ options

#
sub options {
  my $opt;

  while (defined($ARGV[0]) && $ARGV[0] =~ /^-/) {
    $opt = shift @ARGV;
    $opt =~ /c/ && &installcrontab;
    $opt =~ /d/ && $option{DEBUG}++ && print STDERR "Debug is $option{DEBUG}\n";
    $opt =~ /h/ && &help;
    $opt =~ /i/ && ($option{ask}  = 1);
    $opt =~ /l/ && &license;
    $opt =~ /m/ && ($option{mail} = 1);
    $opt =~ /t/ && ($option{mail} = 0);
    $opt =~ /u/ && &uninstallcrontab;
    $opt =~ /v/ && die "\n\t Linux Counter machine-update version $VERSION\n"
      . "\tCVS version $CVS_VERSION\n";
    $opt =~ /x/ && ($option{info} = 1);
  }
}

# }}}

# {{{ askquestions

#
sub askquestions {
  return if ! -t STDIN || ! -t STDOUT;
  $| = 1;
  print "Here you can specify some info that the script can't know for itself\n";
  $values{owner} = askone("Your Linux Counter reg#, if any", $values{owner});
  $values{key}   = askone("Your machine's counter reg#, if any", $values{key});
  print "Here is what the program has found:\n";
  for my $key (keys(%values)) {
    if (!$dontask{$key}) {
      printf "%-10s%1s: %s\n", $key, $dontask{$key}?"*":" ", $values{$key};
    }
  }
  my $domore = &askone('Do you want to override some of the found values?', 'no');
  if ($domore =~ /^Y/i) {
    my $manual;
    for my $key (keys(%values)) {
      next if $dontask{$key};
      my $value = &askone($key, $oldvalues{$key}, $values{$key});
      if ($values{$key} eq $value) {         # go to automatic
    &Debug("auto value: $key\n");
      } else {
    &Debug("still manual value: $key\n");
    $manual .= " $key";
      }
      $values{$key} = $value;
    }
    $values{manual} = $manual;
  } else {
    delete $values{manual};
  }
}

# }}}
# {{{ askone
#
sub askone {
  my $prompt  = shift;
  my $default = shift;
  my $probed  = shift;

  print $prompt;
  if (!defined($default) && defined($probed)) {
    $default = $probed;
  }
  if (defined($default)) {
    print " [$default]";
  }
  if (defined($probed) && $probed ne $default) {
    print "(program found $probed)";
  }
  print ':';

  my $ans = <STDIN>;

  chop $ans;
  &Debug("Answer was $ans\n");
  $ans = $default if (!length($ans));

  return $ans;
}
# }}}

# {{{ copymanuals
#
sub copymanuals {
  my %keeps;
  if ($values{manual}) {
    %keeps = map {$_ => 1} split(' ', $values{manual});
  }

  &Debug('Keeping '.join(' ', keys(%keeps))."\n");
  for my $key (keys(%keeps)) {
    $values{$key} = $oldvalues{$key};
  }
}
# }}}

# {{{ readfile

#
sub readfile {
  my ($sysname, $nodename, $release, $version, $machine ) = POSIX::uname();
  open(INFO, $nodename) || die "Did not find infofile $nodename\n";
  while (<INFO>) {
    chop;
    s/#.*//;
    if (/^(\S+): *(.+)/) {
      &Debug("Read $1: $2\n");
      $values{$1} = $2;
    } else {
      print STDERR "Unparsed info line: $_ - discarded\n";
    }
  }
  close INFO;
  %oldvalues = %values;
}

# }}}
# {{{ writefile

#
sub writefile {
  my ($sysname, $nodename, $release, $version, $machine ) = POSIX::uname();

  open(INFO, ">$nodename.new");
  for my $val (sort keys(%values)) {
    &Debug("Saving $val: $values{$val}\n");
    print INFO "$val: $values{$val}\n";
  }
  close INFO;
  rename("$nodename.new", $nodename) || die "Rename failed\n";
}

# }}}
# {{{ sendfile

#
sub sendfile {
  if ($option{mail}) {
    open(MAIL, "|/usr/lib/sendmail machine-registration\@counter.li.org")
      || die "Unable to open sendmail\n";
  } else {
    warn "--------------------------------------------------------\n";
    warn "This is what will be sent to the Linux Counter if you\n";
    warn "run the program with the -m switch. Now, NOTHING IS SENT\n";
    warn "--------------------------------------------------------\n";
    open(MAIL, ">&STDOUT");
  }
  # note that $ENV{USER} isn't (always) set in a cron job...
  my $user = (getpwuid($<))[0];
  $user = "unknown-id-$<" if !$user;
  print MAIL <<EOF
From: $user
To: machine-registration\@counter.li.org
Subject: machine-update for $values{name}

//MACHINE
EOF
    ;
  for my $val (sort keys(%values)) {
    print MAIL "$val: $values{$val}\n"
      if length($values{$val}) > 0;
  }
  print MAIL "//END\n";
  # Attach possible other info
  if ($errordata) {
    print MAIL "----- Problem info gathered during probing -----\n";
    print MAIL $errordata;
  }
  $option{info} && do {
    print MAIL "----- Debug data for the script maintainer's aid -----\n";
    print MAIL $debugdata;
  };
  close MAIL;
}

# }}}

# {{{ randomnumber
#
sub randomnumber {
  return int(rand(1_000_000_000));
}
# }}}

# {{{ checkconfig

#
sub checkconfig {
  my ($sysname, $nodename, $release, $version, $machine ) = POSIX::uname();

  warn "This is not Linux, but $sysname!\n" if($sysname ne 'Linux');
  $values{method}    = "machine-update version $VERSION";
  $values{os}        = $sysname;
  $values{kernel}    = $release;
  $values{cpu_uname} = $machine;
  $values{name}      = $nodename;   # First order guess

  # Credit for some of the code below goes to
  # Denis Havlik: <havlik@ap.univie.ac.at>
  # Blame is, of course, all mine - HTA -
  # Note - there are numerous problems with df, including:
  # - early versions don't support the -l option
  # - at least some include SAMBA filesystems in the -l option
  open (TMP,"df -l -x shm |");   # exclude shmfs, its 50% of RAM (mostly)
  my $HD = 0;
  while (<TMP>) {
    my @line = split(/\s+/);
    ($line[0] =~ /\/dev/) && ($HD += $line[1]);
  }
  &Debug("$HD kbytes of disk found\n");
  $HD /= 1024;
  $values{disk}     = sprintf("%d", $HD);
  $values{accounts} = &accounts;
  $values{users}    = &active_users;

  my $uptime = &xbin('uptime');
  if($uptime) {
    $uptime = `$uptime`;
    # get the uptime string here (could be more elegant, but so it is
    # robust against various localizations)
    if ($uptime =~ /^\s+[^\s]+\s+[^\s]+\s+([^,]+), /) {
      $values{uptime} = $1;
    } else {
      &ErrorInfo("Can't parse uptime output: $uptime\n");
    }
    if ($option{info}) {
      &DebugInfo("***** Uptime output *****\n$uptime");
    }
  }
  # Not sure this is a Right Thing...so not saving it for the moment
  # This section based on a patch from Mark-Jason Dominus <mjd@plover.com>
  # try to guess mailer based on content of /usr/lib/sendmail link
  if (-l '/usr/lib/sendmail') {
    my $realsendmail = readlink('/usr/lib/sendmail');
    if ($realsendmail eq '../sbin/sendmail') {
      $realsendmail = '/usr/sbin/sendmail';
      if (-l $realsendmail) {
    $realsendmail = readlink($realsendmail);
      }
    }
    if ($realsendmail =~ m{^/var/qmail}) {
      $values{mailer} = "qmail";
    } else {
      &DebugInfo("Found sendmail as a link to $realsendmail\n");
    }
  }
  # Link method did not work. Try to guess based on presence of
  # config files. (this is more susceptible to the old-junk problem)
  if (!$values{mailer}) {
    if ( -d '/var/qmail') {
      $values{mailer} = 'qmail';
    } elsif ( -f '/etc/sendmail.cf') {
      $values{mailer} = 'sendmail';
    } elsif ( -d '/etc/postfix') {
      $values{mailer} = 'postfix';
    }
  }

  # forget about /proc/kcore: It's not reliable above 960MB. It also doesn't show
  #                           real memory, because some may be eaten by graphics
  # forget also about the "free" command: We don't want to be dependant on that
  $values{memory} = int(&getval_from_file('/proc/meminfo',1,1) / (1024*1024));
  # But actually: Shouldn't we return the total of virtual memory here? Seems to
  # be relevant to me - RJ -

  &cpuinfo;
}

# }}}

# {{{ cpuinfo

#
sub cpuinfo {
  my $cpufile   = '/proc/cpuinfo';           # Linux: Place to get info on CPU
  my %interesting = (# 2.0 and 2.2 kernels
             'bogomips'  => '+bogomips',
             'processor' => '1+processors',
             'vendor_id' => 'cpu_vendor',
             # 2.0 kernels
             'cpu'        => 'cpu_only',
             'model'      => 'cpu_model',
             'model name' => 'cpu_model_name',
             # 2.2 kernels
             'cpu MHz'    => 'cpu_mhz',
             'cpu family' => 'cpu_family',
             # from an Alpha processor
             'cycle frequency [Hz]' => 'cpu_hz',
             'BogoMIPS'             => '+bogomips',
             'cpu model'            => 'cpu_model',
             'system type'          => 'cpu_system_type',
             'cpus detected'        => 'processors',
             # from a PowerMAC
             'machine'     => 'cpu_machine',
             'clock'       => 'cpu_clock',
             'motherboard' => 'cpu_motherboard',
             # from an UltraSparc
             'BogoMips'     => '+bogomips',
             'ncpus active' => 'processors',
            );

  # Zero out the accumulative values
  $values{bogomips}   = 0;
  $values{processors} = 0;
  if (open (TMP,"<$cpufile")) {
    &DebugInfo("**** Contents of $cpufile ****\n");
    while (<TMP>) {
      &DebugInfo($_);            # Save /proc/cpuinfo to debugdata if -d
      chop;
      # A bizarre selection of names are "interesting".
      # Make a data-driven pick routine
      if (/^(\S+[^:]+\S)\s+: /) {
    my $name  = $1;
    my $value = $';
    if ($interesting{$name}) {
      if ($interesting{$name} =~ /^\+/) {
        $values{$'} += $value;
      } elsif ($interesting{$name} =~ /^1\+/) {
        $values{$'}++;
      } else {
        $values{$interesting{$name}} = $value;
      }
    }
      }
    }
  } else {
    &ErrorInfo("Could not open $cpufile\n");
  }
}

# }}}

# {{{ accounts

#
sub accounts {
  my $s;
  my $niss;
  my $ypcatbin;                # will hold path to the ypcat binary (if any)

  open (TMP,"</etc/passwd");
  $s += &passwdscan;
  &DebugErr("Found $s accounts total\n");
  &Debug("Switching to NIS passwords\n");

  $ypcatbin = &xbin('ypcat');  # get path to ypcat binary (empty if none)
  if($ypcatbin) {              # test whether ypcat was found
    open TMP, "$ypcatbin passwd 2> /dev/null|"
      || ($errordata .= "ypcat failed: $!\n");
    $niss = &passwdscan;
    $s   += $niss;
    close TMP;
    &Debug("Status of ypcat: $?\n");
    &DebugErr("Found $niss accounts in ypcat passwd\n");
  }

  &DebugErr('Sysaccounts: ', join(' ', keys(%is_sys_account)), "\n");
  &DebugErr("Found $s accounts total\n");

  return $s;
}

# }}}
# {{{ passwdscan

#
sub passwdscan {
  # Code for reading login.defs courtesy of Vassilii Khachaturov
  # <vassilii@tarunz.org>
  local (*DEFS);
  # Try importing UID_MIN and UID_MAX from /etc/login.defs, if possible
  # else just assume the above defaults for min and max non-system UID
  if (!$got_defs && open (DEFS, '/etc/login.defs')) {
    while (<DEFS>) {
      if (/^\s*(UID_(?:MIN|MAX))\s+(\d+)/) {
    # elegant, but not compatible with "strict refs":
    #${ $1 } = $2;
    if ($1 eq "UID_MIN") {
      $UID_MIN = $2;
    } else {
      $UID_MAX = $2;
    }
    &Debug("DEFS match: $1 = $2\n");
      }
    }
    close (DEFS);
    $got_defs = 1;
  }
  &Debug("UID_MIN = $UID_MIN, UID_MAX = $UID_MAX\n");
  # I suppose this is as good as it gets - 
  #   Usually user accounts have UID > 100 and 
  #   "system accounts" have UID < 100, but there is no guarantee   
  # that 
  #   this will hold for pseudo-users like "postgress" etc.
  # Also nobody is usually 99 on linux, but -1 on "standard" unices.
  # RedHat places the dividing line at 500. Others use 400...
  my @line;
  my $s = 0;

  while (<TMP>) {
    @line = split ':';
    if ($line[2] >= $UID_MIN && $line[2] <= $UID_MAX
    && !($line[0] eq 'nobody')) {
      $s++;
      $is_account{$line[0]} = 1;
    } else {
      $is_sys_account{$line[0]} = 1;
    }
  }

  return $s;
}

# }}}
# {{{ active_users

#
# This is kind of alpha, but please test it.
# It calculates the number of "active" users based on the "wtmp" entries
# unfortunately at least Mandrake 8 and 9 ship with non-world-read wtmp
# and non-set-uid last, so this does not work any more...
#
# RJ: Actually I think the best thing to do is to bury this code and be silent about it.
#
sub active_users {
  my $userslisted;

  for (qw(reboot wtmp runlevel)) {  # This sysaccounts shouldn't be counted. Who else?
    $is_sys_account{$_} = 1;
  }
  open( TMP, "/usr/bin/last 2>&1|");
  while (<TMP>) {
    chop;
    if (m!/var/log/wtmp: Permission denied!) { # RJ: ***Boom*** on every non-EN system
      &ErrorInfo("/usr/bin/last failed because /var/log/wtmp isn't readable\n");
      last;
    }
    last if(!$_);                            # RJ: quick hack to safe bad code from harm
    my @tmp  = split;
    my $name = $tmp[0];
    if ($is_sys_account{$name}) {
      # do nothing
    } elsif (defined $is_account{$name}) {
      $is_user{$name} = 1;
    } elsif (/^\s*$/) {                      # blank line - do nothing
    } elsif ($#tmp == 9) {                   # OK line, but unknown user
      $option{DEBUG} && do {
    if (!$userslisted) {
      print STDERR 'Know users are: ',
        join(' ', keys(%is_account)), "\n";
      $userslisted = 1;
    }
    print STDERR "Unknown user: $name\n";
      }
    } else {
      &DebugErr("Strange line: $_\n");
    }
  }
  close TMP;
  my $i = 0;
  for (sort keys %is_user) {
    $option{DEBUG} && printf "Active user %3d: %s\n", ++$i, $_;
  }
  &Debug("$i active users found.\n");

  return $i;
}

# }}}

# {{{ installcrontab

#
sub installcrontab {
  my $hour = int(rand(24));
  my $min  = int(rand(60));
  my $day  = int(rand(7));  # Weekday. This version runs once a week.
  my $cron;

  warn "Installing start of script into your crontab\n";
  if (open(CRON, "crontab -l |")) {
    &Debug("Checking crontab for machine-update\n");
    &Debug("Want to install as $progname\n");
    while (<CRON>) {
      if (/^#/ && $. <= 3) {    # initial comment
    &Debug("Skipping comment: $_");
    next;
      }
      if (/machine-update/) {
    if (/ $progname -m/) {
      die "Crontab entry already installed: $_\n";
    } else {
      die "Another entry with machine-update: $_\n";
    }
      }
      $cron .= $_;
    }
    close CRON;
    &Debug("Result from crontab -l: ", $? / 256, "\n");
    if ($? == 0) {
      &Debug("Crontab successfully read\n");
    } elsif ($? == 256) {
      warn "You don't seem to have a crontab. I will create one.\n";
    } else {
      die "Failed to read your crontab. Please report this as a bug: $?\n";
    }
  } else {
    &Debug("Result from crontab open(): $?\n");
    die "Unable to execute crontab command. Please check your system\n";
  }
  open(CRON, "|crontab -");
  print CRON $cron;
  print CRON "$min $hour * * $day $progname -m\n";
  close CRON;
  &Debug("Result from crontab: $?\n");
  if ($?) {
    die(<<EoF);
Installing new crontab failed.
YOUR CRONTAB MAY BE DAMAGED - use crontab -l to check it.
Here's its former content (if any):

$cron

EoF
  }
  print "Crontab entry successfully installed.\nWill run on day $day of every week, at $hour:$min\n";

  exit 0;
}

# }}}
# {{{ uninstallcrontab

#
sub uninstallcrontab {
  my $found = 0;
  my $cron;

  print STDERR "Removing $progname from your crontab\n";
  open(CRON, "crontab -l |");
  &Debug("Checking crontab for machine-update\n");
  &Debug("Want to uninstall as $progname\n");
  while (<CRON>) {
    if (/^#/ && $. <= 3) {  # initial comment
      &Debug("Skipping comment: $_");
      next;
    }
    if (/machine-update/) {
      if (/ $progname -m/) {
    print STDERR "Crontab entry found and removed\n";
    $found = 1;
    next;           # skip stuff at end....
      } else {
    die "Another entry with machine-update: $_\nUninstall manually?\n";
      }
    }
    $cron .= $_;
  }
  close CRON;
  &Debug("Result from crontab -l: $?\n");
  if ($?) {
    die "Failed to read your crontab. You may not have one?\n";
  }
  if ($found) {
    open(CRON, "|crontab -");
    print CRON $cron;
    close CRON;
    &Debug("Result from crontab: $?\n");
    if ($?) {
      die(<<EoF);
Installing new crontab failed.
YOUR CRONTAB MAY BE DAMAGED - use crontab -l to check it.
Here's its former content (if any):

$cron

EoF
    }
  } else {
    print STDERR "No instance of $progname found in your crontab\n";
  }

  exit 0;
}

# }}}

# {{{ xbin                       execute a linux binary

#
# This sub is to execute a linux binary robustly. i.e. testing
# whether it is present, where it is present, whether it is executable
#
sub xbin {
  my $bin = shift;             # get name of binary to execute

  $bin = `which $bin`;         # determine binarys full path
  chomp $bin;
  return $bin if(-x $bin);     # if there and executable: all is well - return it

  if(!$bin) {                  # if not there
    &Debug("No $bin found\n"); # state so
  } else {                     # there but not executable
    &Debug("$bin found, but not executable\n");
  }

  return '';                   # so return an empty string (binary will not exec)
}

# }}}
# {{{ getval_from_file           get value from system file @ row,col

#
sub getval_from_file {
  my $file = shift;
  my $row  = shift;
  my $col  = shift;
  my @file;
  my @cols;

  if (!(-r $file)) {
    &DebugErr("File $file not readable\n");
    return '';
  }
  sysopen(FH,$file, O_RDONLY);
  @file = <FH>;                     # read whole file to array
  close FH;

  @cols = split /\s+/, $file[$row]; # get the right row

  return $cols[$col];               # return the right column
}

# }}}

# {{{ Debug                      print debug information if flag is set

#
sub Debug {
  $option{DEBUG} && print @_;
}

# }}}
# {{{ DebugErr                   print debug on STDERR if flag is set

#
sub DebugErr {
  $option{DEBUG} && print STDERR @_;
}

# }}}
# {{{ ErrorInfo
sub ErrorInfo {
  $errordata .= join('', @_);
}
# }}}
# {{{ DebugInfo

sub DebugInfo {
  $option{info} && ($debugdata .= join('', @_));
}

# }}}

# {{{ help                       print help & exit

#
sub help {
  my $host = `uname -n`;

  print <<EoF;
machine-update version $VERSION
Send machine information to the Linux Counter

USE: machine-update [-i] [-(t|d|l|m|v|x|c|u|h)]

SWITCHES:
 -i = interactive
 -t = test (do not send e-mail, just print it ot STDOUT - default)
 -d = debug (test, and print additional debug informations)
 -l = display license
 -m = mail results to linux-counter
 -v = print version and exit
 -x = send extra info to server (Debug)
 -c = install crontab entry
 -u = uninstall crontab entry
 -h = print usage information and exit
If called interactively, will ask some questions and store the
answers in $ENV{HOME}/.linuxcounter/$host

EoF

exit 0;
}

# }}}
# {{{ license                    print license & exit

#
sub license {
  print <<EoF;

    Linux Counter Machine Update version $VERSION

    Copyright (C) 1999 Harald Tveit Alvestrand
                  2003 PetaMem Group (www.petamem.com)

    This program is free software; you can redistribute it and/or modify
    it under the terms of the GNU General Public License as published by
    the Free Software Foundation; either version 2 of the License, or
    (at your option) any later version.

    This program is distributed in the hope that it will be useful,
    but WITHOUT ANY WARRANTY; without even the implied warranty of
    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
    GNU General Public License below for more details.


            GNU GENERAL PUBLIC LICENSE
               Version 2, June 1991

 Copyright (C) 1989, 1991 Free Software Foundation, Inc.
                          675 Mass Ave, Cambridge, MA 02139, USA
 Everyone is permitted to copy and distribute verbatim copies
 of this license document, but changing it is not allowed.

                Preamble

  The licenses for most software are designed to take away your
freedom to share and change it.  By contrast, the GNU General Public
License is intended to guarantee your freedom to share and change free
software--to make sure the software is free for all its users.  This
General Public License applies to most of the Free Software
Foundation's software and to any other program whose authors commit to
using it.  (Some other Free Software Foundation software is covered by
the GNU Library General Public License instead.)  You can apply it to
your programs, too.

  When we speak of free software, we are referring to freedom, not
price.  Our General Public Licenses are designed to make sure that you
have the freedom to distribute copies of free software (and charge for
this service if you wish), that you receive source code or can get it
if you want it, that you can change the software or use pieces of it
in new free programs; and that you know you can do these things.

  To protect your rights, we need to make restrictions that forbid
anyone to deny you these rights or to ask you to surrender the rights.
These restrictions translate to certain responsibilities for you if you
distribute copies of the software, or if you modify it.

  For example, if you distribute copies of such a program, whether
gratis or for a fee, you must give the recipients all the rights that
you have.  You must make sure that they, too, receive or can get the
source code.  And you must show them these terms so they know their
rights.

  We protect your rights with two steps: (1) copyright the software, and
(2) offer you this license which gives you legal permission to copy,
distribute and/or modify the software.

  Also, for each author's protection and ours, we want to make certain
that everyone understands that there is no warranty for this free
software.  If the software is modified by someone else and passed on, we
want its recipients to know that what they have is not the original, so
that any problems introduced by others will not reflect on the original
authors' reputations.

  Finally, any free program is threatened constantly by software
patents.  We wish to avoid the danger that redistributors of a free
program will individually obtain patent licenses, in effect making the
program proprietary.  To prevent this, we have made it clear that any
patent must be licensed for everyone's free use or not licensed at all.

  The precise terms and conditions for copying, distribution and
modification follow.

            GNU GENERAL PUBLIC LICENSE
   TERMS AND CONDITIONS FOR COPYING, DISTRIBUTION AND MODIFICATION

  0. This License applies to any program or other work which contains
a notice placed by the copyright holder saying it may be distributed
under the terms of this General Public License.  The "Program", below,
refers to any such program or work, and a "work based on the Program"
means either the Program or any derivative work under copyright law:
that is to say, a work containing the Program or a portion of it,
either verbatim or with modifications and/or translated into another
language.  (Hereinafter, translation is included without limitation in
the term "modification".)  Each licensee is addressed as "you".

Activities other than copying, distribution and modification are not
covered by this License; they are outside its scope.  The act of
running the Program is not restricted, and the output from the Program
is covered only if its contents constitute a work based on the
Program (independent of having been made by running the Program).
Whether that is true depends on what the Program does.

  1. You may copy and distribute verbatim copies of the Program's
source code as you receive it, in any medium, provided that you
conspicuously and appropriately publish on each copy an appropriate
copyright notice and disclaimer of warranty; keep intact all the
notices that refer to this License and to the absence of any warranty;
and give any other recipients of the Program a copy of this License
along with the Program.

You may charge a fee for the physical act of transferring a copy, and
you may at your option offer warranty protection in exchange for a fee.

  2. You may modify your copy or copies of the Program or any portion
of it, thus forming a work based on the Program, and copy and
distribute such modifications or work under the terms of Section 1
above, provided that you also meet all of these conditions:

    a) You must cause the modified files to carry prominent notices
    stating that you changed the files and the date of any change.

    b) You must cause any work that you distribute or publish, that in
    whole or in part contains or is derived from the Program or any
    part thereof, to be licensed as a whole at no charge to all third
    parties under the terms of this License.

    c) If the modified program normally reads commands interactively
    when run, you must cause it, when started running for such
    interactive use in the most ordinary way, to print or display an
    announcement including an appropriate copyright notice and a
    notice that there is no warranty (or else, saying that you provide
    a warranty) and that users may redistribute the program under
    these conditions, and telling the user how to view a copy of this
    License.  (Exception: if the Program itself is interactive but
    does not normally print such an announcement, your work based on
    the Program is not required to print an announcement.)

These requirements apply to the modified work as a whole.  If
identifiable sections of that work are not derived from the Program,
and can be reasonably considered independent and separate works in
themselves, then this License, and its terms, do not apply to those
sections when you distribute them as separate works.  But when you
distribute the same sections as part of a whole which is a work based
on the Program, the distribution of the whole must be on the terms of
this License, whose permissions for other licensees extend to the
entire whole, and thus to each and every part regardless of who wrote it.

Thus, it is not the intent of this section to claim rights or contest
your rights to work written entirely by you; rather, the intent is to
exercise the right to control the distribution of derivative or
collective works based on the Program.

In addition, mere aggregation of another work not based on the Program
with the Program (or with a work based on the Program) on a volume of
a storage or distribution medium does not bring the other work under
the scope of this License.

  3. You may copy and distribute the Program (or a work based on it,
under Section 2) in object code or executable form under the terms of
Sections 1 and 2 above provided that you also do one of the following:

    a) Accompany it with the complete corresponding machine-readable
    source code, which must be distributed under the terms of Sections
    1 and 2 above on a medium customarily used for software interchange; or,

    b) Accompany it with a written offer, valid for at least three
    years, to give any third party, for a charge no more than your
    cost of physically performing source distribution, a complete
    machine-readable copy of the corresponding source code, to be
    distributed under the terms of Sections 1 and 2 above on a medium
    customarily used for software interchange; or,

    c) Accompany it with the information you received as to the offer
    to distribute corresponding source code.  (This alternative is
    allowed only for noncommercial distribution and only if you
    received the program in object code or executable form with such
    an offer, in accord with Subsection b above.)

The source code for a work means the preferred form of the work for
making modifications to it.  For an executable work, complete source
code means all the source code for all modules it contains, plus any
associated interface definition files, plus the scripts used to
control compilation and installation of the executable.  However, as a
special exception, the source code distributed need not include
anything that is normally distributed (in either source or binary
form) with the major components (compiler, kernel, and so on) of the
operating system on which the executable runs, unless that component
itself accompanies the executable.

If distribution of executable or object code is made by offering
access to copy from a designated place, then offering equivalent
access to copy the source code from the same place counts as
distribution of the source code, even though third parties are not
compelled to copy the source along with the object code.

  4. You may not copy, modify, sublicense, or distribute the Program
except as expressly provided under this License.  Any attempt
otherwise to copy, modify, sublicense or distribute the Program is
void, and will automatically terminate your rights under this License.
However, parties who have received copies, or rights, from you under
this License will not have their licenses terminated so long as such
parties remain in full compliance.

  5. You are not required to accept this License, since you have not
signed it.  However, nothing else grants you permission to modify or
distribute the Program or its derivative works.  These actions are
prohibited by law if you do not accept this License.  Therefore, by
modifying or distributing the Program (or any work based on the
Program), you indicate your acceptance of this License to do so, and
all its terms and conditions for copying, distributing or modifying
the Program or works based on it.

  6. Each time you redistribute the Program (or any work based on the
Program), the recipient automatically receives a license from the
original licensor to copy, distribute or modify the Program subject to
these terms and conditions.  You may not impose any further
restrictions on the recipients' exercise of the rights granted herein.
You are not responsible for enforcing compliance by third parties to
this License.

  7. If, as a consequence of a court judgment or allegation of patent
infringement or for any other reason (not limited to patent issues),
conditions are imposed on you (whether by court order, agreement or
otherwise) that contradict the conditions of this License, they do not
excuse you from the conditions of this License.  If you cannot
distribute so as to satisfy simultaneously your obligations under this
License and any other pertinent obligations, then as a consequence you
may not distribute the Program at all.  For example, if a patent
license would not permit royalty-free redistribution of the Program by
all those who receive copies directly or indirectly through you, then
the only way you could satisfy both it and this License would be to
refrain entirely from distribution of the Program.

If any portion of this section is held invalid or unenforceable under
any particular circumstance, the balance of the section is intended to
apply and the section as a whole is intended to apply in other
circumstances.

It is not the purpose of this section to induce you to infringe any
patents or other property right claims or to contest validity of any
such claims; this section has the sole purpose of protecting the
integrity of the free software distribution system, which is
implemented by public license practices.  Many people have made
generous contributions to the wide range of software distributed
through that system in reliance on consistent application of that
system; it is up to the author/donor to decide if he or she is willing
to distribute software through any other system and a licensee cannot
impose that choice.

This section is intended to make thoroughly clear what is believed to
be a consequence of the rest of this License.

  8. If the distribution and/or use of the Program is restricted in
certain countries either by patents or by copyrighted interfaces, the
original copyright holder who places the Program under this License
may add an explicit geographical distribution limitation excluding
those countries, so that distribution is permitted only in or among
countries not thus excluded.  In such case, this License incorporates
the limitation as if written in the body of this License.

  9. The Free Software Foundation may publish revised and/or new versions
of the General Public License from time to time.  Such new versions will
be similar in spirit to the present version, but may differ in detail to
address new problems or concerns.

Each version is given a distinguishing version number.  If the Program
specifies a version number of this License which applies to it and "any
later version", you have the option of following the terms and conditions
either of that version or of any later version published by the Free
Software Foundation.  If the Program does not specify a version number of
this License, you may choose any version ever published by the Free Software
Foundation.

  10. If you wish to incorporate parts of the Program into other free
programs whose distribution conditions are different, write to the author
to ask for permission.  For software which is copyrighted by the Free
Software Foundation, write to the Free Software Foundation; we sometimes
make exceptions for this.  Our decision will be guided by the two goals
of preserving the free status of all derivatives of our free software and
of promoting the sharing and reuse of software generally.

                NO WARRANTY

  11. BECAUSE THE PROGRAM IS LICENSED FREE OF CHARGE, THERE IS NO WARRANTY
FOR THE PROGRAM, TO THE EXTENT PERMITTED BY APPLICABLE LAW.  EXCEPT WHEN
OTHERWISE STATED IN WRITING THE COPYRIGHT HOLDERS AND/OR OTHER PARTIES
PROVIDE THE PROGRAM "AS IS" WITHOUT WARRANTY OF ANY KIND, EITHER EXPRESSED
OR IMPLIED, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE.  THE ENTIRE RISK AS
TO THE QUALITY AND PERFORMANCE OF THE PROGRAM IS WITH YOU.  SHOULD THE
PROGRAM PROVE DEFECTIVE, YOU ASSUME THE COST OF ALL NECESSARY SERVICING,
REPAIR OR CORRECTION.

  12. IN NO EVENT UNLESS REQUIRED BY APPLICABLE LAW OR AGREED TO IN WRITING
WILL ANY COPYRIGHT HOLDER, OR ANY OTHER PARTY WHO MAY MODIFY AND/OR
REDISTRIBUTE THE PROGRAM AS PERMITTED ABOVE, BE LIABLE TO YOU FOR DAMAGES,
INCLUDING ANY GENERAL, SPECIAL, INCIDENTAL OR CONSEQUENTIAL DAMAGES ARISING
OUT OF THE USE OR INABILITY TO USE THE PROGRAM (INCLUDING BUT NOT LIMITED
TO LOSS OF DATA OR DATA BEING RENDERED INACCURATE OR LOSSES SUSTAINED BY
YOU OR THIRD PARTIES OR A FAILURE OF THE PROGRAM TO OPERATE WITH ANY OTHER
PROGRAMS), EVEN IF SUCH HOLDER OR OTHER PARTY HAS BEEN ADVISED OF THE
POSSIBILITY OF SUCH DAMAGES.

             END OF TERMS AND CONDITIONS

EoF

  exit 0;
}

# }}}

# Changelog for 0.2
#  - indentation and folding marks
#  - made script work with -w and use strict
#  - removed some localization traps
#  - marked some BUGS - but they`re still there (mostly localization)
#  - more robust binary calls
#  - getval_from_file data acquisition method
#  - fixed df (shmfs) - but only temporarily (quick hack)
#  - various code optimizations & cleanup (removed unneded vars)
#  - Memory size detection now robst and >960MB capable
#  - slightly better randomness
#
#vim:ts=8:sw=4:sts=4