Davide Airaghi, Autore a Davide Airaghi

WordPress – Plugin to manage robots.txt

To have a simple and quick management tool to edit robots.txt in a WordPress website i realized this plugin that allows you to: add extra content to default robots.txt totally overwrite default robots.txt Plugin can be download from https://www.wordpress.org/plugins/robots-txt-quick-editor/

Linux: get UPS remaining battery time

If you have a UPS connected to your Linux box maybe you need some simple way to get how much power is left in the batteries, i’ve written a simple tool to get this information (note: you need Nut to be installed, configured and running). #!/bin/bash# device to check using “nut” utilitiesUPSDEV=”usbups@localhost”# chars to be …

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Walking Light

Walking in low light situations it may be necessary to make yourself more visible, for this reason a flashing light (with a color of your choice between 3 shades) can be really useful With “Walking Light” you have at your disposal a simple and intuitive tool that allows you to have a flashing light in …

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openSuse: Apache modules management from shell

To manage Apache Httpd on openSuse we have the classic command a2enmod, shared with many other distros, which allows to: 1) know if a module is enabled, 2) enable a module and 3) disable a module. To extend what already present in a2enmod i have written a simple wrapper to a2enmod in order to have …

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Apache Netbeans for Linux: get latest build

After having seen how to build Apache Netbeans on a Linux box here you can find how to get the latest build (no more compiling!) from Apache servers. It’a all in a couple of shell commands :

Apache NetBeans – building and installation

NetBeans is now an Apache Foundation project, but (as of today) we lost the possibility to download a specific release (Java only, PHP, C/C++, …), the standard version available (release 9+) is only built with Java support. I have created a very simple script that build Apache NetBeans including support for various programming languages (PHP included), getting sources from …

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PHP – file encryption/decryption

To have some sort of privacy while sending/receiving messages (or files) using encryption is the first choice. Below you can find a very simple PHP web application that allows you to encrypt/decrypt a file using your web browser (and a web server hosting the page).

<?php

$ALGORITHM = 'AES-128-CBC';
$IV    = '12dasdq3g5b2434b';

$error = '';

if (isset($_POST) && isset($_POST['action'])) {
  
  $password   = isset($_POST['password']) && $_POST['password']!='' ? $_POST['password'] : null;
  $action = isset($_POST['action']) && in_array($_POST['action'],array('c','d')) ? $_POST['action'] : null;
  $file     = isset($_FILES) && isset($_FILES['file']) && $_FILES['file']['error'] == UPLOAD_ERR_OK ? $_FILES['file'] : null;
  
  if ($password === null) {
    $error .= 'Invalid Password<br>';
  }
  if ($action === null) {
    $error .= 'Invalid Action<br>';
  }
  if ($file === null) {
    $error .= 'Errors occurred while elaborating the file<br>';
  }
  
  if ($error === '') {
  
    $contenuto = '';
    $nomefile  = '';
  
    $contenuto = file_get_contents($file['tmp_name']);
    $filename  = $file['name'];
  
    switch ($action) {
      case 'c':
        $contenuto = openssl_encrypt($contenuto, $ALGORITHM, $password, 0, $IV);
        $filename  = $filename . '.crypto';
        break;
      case 'd':
        $contenuto = openssl_decrypt($contenuto, $ALGORITHM, $password, 0, $IV);
        $filename  = preg_replace('#\.crypto$#','',$filename);
        break;
    }
    
    if ($contenuto === false) {
      $error .= 'Errors occurred while encrypting/decrypting the file ';
    }
    
    if ($error === '') {
    
      header("Pragma: public");
      header("Pragma: no-cache");
      header("Cache-Control: no-store, no-cache, must-revalidate, max-age=0");
      header("Cache-Control: post-check=0, pre-check=0", false);
      header("Expires: 0");
      header("Content-Type: application/octet-stream");
      header("Content-Disposition: attachment; filename=\"" . $filename . "\";");
      $size = strlen($contenuto);
      header("Content-Length: " . $size);
      echo $contenuto;    
      die;
      
    }
  
  }
  
}


?>
<html>
  <head>
    <title>Encrypt/Decrypt file</title>
    <meta charset="utf-8">
    <meta name="viewport" content="width=device-width, initial-scale=1, shrink-to-fit=no">
    <link rel="stylesheet" href="https://stackpath.bootstrapcdn.com/bootstrap/4.1.0/css/bootstrap.min.css">
  </head>
  <body>
    <div class="container">
      <div class="row">
        <div class="col-12" >
          <h1>Utility to encrypt/decrypt a file</h1>
        </div>
      </div>
      <?php if ($error != '') { ?>
      <div class="row">
        <div class="col-12 alert alert-danger" role="alert">
          <?php echo ($error); ?>
        </div>
      </div>
      <?php } ?>
      <form class="form" enctype="multipart/form-data" method="post" id="form1" name="form1" auto-complete="off">
        <div class="form-row">
          <div class="form-group">
            <label for="file">File</label>
            <input type="file" name="file" id="file" placeholder="Choose a file" required class="form-control-file"/>
          </div>
        </div>
        <div class="form-row">
          <div class="form-group">
            <label for="password">Password</label>
            <input type="password" name="password" id="password" placeholder="Insert password" required class="form-control" />
          </div>
        </div>
        <div class="form-row">
          <div class="form-group">
            <label for="action">Action</label>
            <select name="action" id="action" required class="form-control">
              <option value="">-- Choose --</option>
              <option value="c">Encrypt</option>
              <option value="d">Decrypt</option>
            </select>
          </div>
        </div>
        <div class="form-row">
          <button type="submit" class="btn btn-primary" onclick="setTimeout('document.form1.reset();',1000)">Execute</button>
          <button type="reset" class="btn btn-reset">Reset</button>
         </div>
      </form>
    </div>
    <script type="text/javascript" src="https://code.jquery.com/jquery-3.3.1.slim.min.js"></script>
    <script type="text/javascript" src="https://stackpath.bootstrapcdn.com/bootstrap/4.1.0/js/bootstrap.bundle.min.js"></script>
  </body>
</html>

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<?php

$ALGORITHM = 'AES-128-CBC';

$IV = '12dasdq3g5b2434b';

$error = '';

if (isset($_POST) && isset($_POST['action'])) {

$password = isset($_POST['password']) && $_POST['password']!='' ? $_POST['password'] : null;

$action = isset($_POST['action']) && in_array($_POST['action'],array('c','d')) ? $_POST['action'] : null;

$file = isset($_FILES) && isset($_FILES['file']) && $_FILES['file']['error'] == UPLOAD_ERR_OK ? $_FILES['file'] : null;

if ($password === null) {

$error .= 'Invalid Password<br>';

}

if ($action === null) {

$error .= 'Invalid Action<br>';

}

if ($file === null) {

$error .= 'Errors occurred while elaborating the file<br>';

}

if ($error === '') {

$contenuto = '';

$nomefile = '';

$contenuto = file_get_contents($file['tmp_name']);

$filename = $file['name'];

switch ($action) {

case 'c':

$contenuto = openssl_encrypt($contenuto, $ALGORITHM, $password, 0, $IV);

$filename = $filename . '.crypto';

break;

case 'd':

$contenuto = openssl_decrypt($contenuto, $ALGORITHM, $password, 0, $IV);

$filename = preg_replace('#\.crypto$#','',$filename);

break;

}

if ($contenuto === false) {

$error .= 'Errors occurred while encrypting/decrypting the file ';

}

if ($error === '') {

header("Pragma: public");

header("Pragma: no-cache");

header("Cache-Control: no-store, no-cache, must-revalidate, max-age=0");

header("Cache-Control: post-check=0, pre-check=0", false);

header("Expires: 0");

header("Content-Type: application/octet-stream");

header("Content-Disposition: attachment; filename=\"" . $filename . "\";");

$size = strlen($contenuto);

header("Content-Length: " . $size);

echo $contenuto;

die;

}

<html>

<head>

<title>Encrypt/Decrypt file</title>

</head>

<body>

<h1>Utility to encrypt/decrypt a file</h1>

</div>

<?php if ($error != '') { ?>

<?php echo ($error); ?>

</div>

<?php } ?>

</div>

<label for="password">Password</label>

</div>

<label for="action">Action</label>

<option value="">-- Choose --</option>

<option value="c">Encrypt</option>

<option value="d">Decrypt</option>

</select>

</div>

<button type="submit" class="btn btn-primary" onclick="setTimeout('document.form1.reset();',1000)">Execute</button>

<button type="reset" class="btn btn-reset">Reset</button>

</div>

</form>

</div>

</body>

</html>

Linux: get info about notebook battery

Below you can find a very simple shell script that gets information about every battery present in your notebook and shows a summary. create a new file (es: /usr/local/bin/battery.sh) paste inside the new file the following code

#!/bin/sh

oDIR=$( pwd )
oIFS=$IFS
IFS=$'\n'

for BATTERY in $( find /sys -name "BAT*" -type d 2>/dev/null );
do
	cd $BATTERY
	
	PRESENT=$( grep 1 present 2>/dev/null)
	if [ "$PRESENT" != "" ]; then
		PRESENT="Yes"
	else
		PRESENT="No"
	fi
	MODEL="$(cat manufacturer 2>/dev/null) $(cat model_name 2>/dev/null) $(cat technology 2>/dev/null)"
	SERIAL=$(cat serial_number 2>/dev/null | sed -es/\ //g)
	[ "$SERIAL" != "" ] && MODEL="$MODEL - s/n: $SERIAL"
	CYCLES=$( cat cycle_count 2>/dev/null )
	[ "$CYCLES" = "" ] && CYCLES="N.A."
	STATUS=$( cat status 2>/dev/null )
	[ "$STATUS" = "" ] && STATUS="N.A."
	CAPACITY=$( cat capacity_level 2>/dev/null)
	[ "$CAPACITY" = "" ] && CAPACITY="N.A."
	CAPACITY_PCT=$( cat capacity 2>/dev/null)
	[ "$CAPACITY_PCT" != "" ] && CAPACITY="${CAPACITY_PCT}% - $CAPACITY"
	ENERGY=$( cat energy_full 2>/dev/null )
	[ "$ENERGY" = "" ] && ENERGY="N.A."
	ENERGY_DESIGN=$( cat energy_full_design 2>/dev/null )
	[ "$ENERGY_DESIGN" = "" ] && ENERGY_DESIGN="N.A."
	[[ "$ENERGY_DESIGN" != "N.A." && "$ENERGY" != "N.A." ]] && ENERGY=$(( 100*$ENERGY/$ENERGY_DESIGN ))
	VOLTAGE=$( cat voltage_now 2>/dev/null )
	[ "$VOLTAGE" = "" ] && VOLTAGE="N.A."
	[ "$VOLTAGE" != "N.A." ] && VOLTAGE="$( echo $VOLTAGE | head -c2).$( echo $VOLTAGE | head -c4 | tail -c2)"
	VOLTAGE_MIN=$( cat voltage_min_design 2>/dev/null )
	[ "$VOLTAGE_MIN" = "" ] && VOLTAGE_MIN="N.A."
	[ "$VOLTAGE_MIN" != "N.A." ] && VOLTAGE_MIN="$( echo $VOLTAGE_MIN | head -c2).$( echo $VOLTAGE_MIN | head -c4 | tail -c2)"
	
	echo "Battery $(basename $BATTERY)"
	echo "- Model: $MODEL"
	echo "- Present: $PRESENT"
	echo "- Status: $STATUS"
	echo "- Capacity: $CAPACITY"
	[[ "$CYCLES" != "N.A." && "$CYCLES" != "0" ]] && echo "- Cycles: $CYCLES"
	[[ "$ENERGY" != "N.A." ]] && echo "- Max Energy: ${ENERGY}% of original"
	echo "- Voltage: $VOLTAGE (Original min: $VOLTAGE_MIN)"
	echo ""
	
done


IFS=$oIFS
cd $oDIR

#!/bin/sh

oDIR=$( pwd )

oIFS=$IFS

IFS=$'\n'

for BATTERY in $( find /sys -name "BAT*" -type d 2>/dev/null );

cd $BATTERY

PRESENT=$( grep 1 present 2>/dev/null)

if [ "$PRESENT" != "" ]; then

PRESENT="Yes"

else

PRESENT="No"

MODEL="$(cat manufacturer 2>/dev/null) $(cat model_name 2>/dev/null) $(cat technology 2>/dev/null)"

SERIAL=$(cat serial_number 2>/dev/null | sed -es/\ //g)

[ "$SERIAL" != "" ] && MODEL="$MODEL - s/n: $SERIAL"

CYCLES=$( cat cycle_count 2>/dev/null )

[ "$CYCLES" = "" ] && CYCLES="N.A."

STATUS=$( cat status 2>/dev/null )

[ "$STATUS" = "" ] && STATUS="N.A."

CAPACITY=$( cat capacity_level 2>/dev/null)

[ "$CAPACITY" = "" ] && CAPACITY="N.A."

CAPACITY_PCT=$( cat capacity 2>/dev/null)

[ "$CAPACITY_PCT" != "" ] && CAPACITY="${CAPACITY_PCT}% - $CAPACITY"

ENERGY=$( cat energy_full 2>/dev/null )

[ "$ENERGY" = "" ] && ENERGY="N.A."

ENERGY_DESIGN=$( cat energy_full_design 2>/dev/null )

[ "$ENERGY_DESIGN" = "" ] && ENERGY_DESIGN="N.A."

[[ "$ENERGY_DESIGN" != "N.A." && "$ENERGY" != "N.A." ]] && ENERGY=$(( 100*$ENERGY/$ENERGY_DESIGN ))

VOLTAGE=$( cat voltage_now 2>/dev/null )

[ "$VOLTAGE" = "" ] && VOLTAGE="N.A."

[ "$VOLTAGE" != "N.A." ] && VOLTAGE="$( echo $VOLTAGE | head -c2).$( echo $VOLTAGE | head -c4 | tail -c2)"

VOLTAGE_MIN=$( cat voltage_min_design 2>/dev/null )

[ "$VOLTAGE_MIN" = "" ] && VOLTAGE_MIN="N.A."

[ "$VOLTAGE_MIN" != "N.A." ] && VOLTAGE_MIN="$( echo $VOLTAGE_MIN | head -c2).$( echo $VOLTAGE_MIN | head -c4 | tail -c2)"

echo "Battery $(basename $BATTERY)"

echo "- Model: $MODEL"

echo "- Present: $PRESENT"

echo "- Status: $STATUS"

echo "- Capacity: $CAPACITY"

[[ "$CYCLES" != "N.A." && "$CYCLES" != "0" ]] && echo "- Cycles: $CYCLES"

[[ "$ENERGY" != "N.A." ]] && echo "- Max Energy: ${ENERGY}% of original"

echo "- Voltage: $VOLTAGE (Original min: $VOLTAGE_MIN)"

echo ""

done

IFS=$oIFS

cd $oDIR

save the file make the file executable (es: chmod +x /usr/local/bin/battery.sh) use the script (from a terminal execute: /usr/local/bin/battery.sh) …

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Automatic Wpa Supplicant restart

If wifi connection used by your Linux box is not stable and goes up&down, with wpa_supplicant requiring some manual restart you could use a simple script that does it for you. Below you can find a script i’m using on a RaspberryPi 3 with Raspian installed.

#!/bin/sh

WLAN=wlan0

DEAD=$(service wpa_supplicant status 2>/dev/null | grep -i dead)
YESIP=$( ip addr show $WLAN | grep "inet\b" | awk '{print $2}' | cut -d/ -f1 )
CMD=$( ps -eo args | grep wpa_suppl | grep -v grep )

if [ "$YESIP" == "" ]; then 
    DEAD="DEAD"
else 
    ping 8.8.8.8 -c 5 >/dev/null 2>/dev/null 
    if [ "$?" != "0" ]; then 
        DEAD="DEAD" 
    else 
        DEAD="" 
    fi
fi

if [ "$DEAD" != "" ]; then 
    pkill -9 wpa_supplicant 
    $CMD &
fi

#!/bin/sh

WLAN=wlan0

DEAD=$(service wpa_supplicant status 2>/dev/null | grep -i dead)

YESIP=$( ip addr show $WLAN | grep "inet\b" | awk '{print $2}' | cut -d/ -f1 )

CMD=$( ps -eo args | grep wpa_suppl | grep -v grep )

if [ "$YESIP" == "" ]; then

DEAD="DEAD"

else

ping 8.8.8.8 -c 5 >/dev/null 2>/dev/null

if [ "$?" != "0" ]; then

DEAD="DEAD"

else

DEAD=""

if [ "$DEAD" != "" ]; then

pkill -9 wpa_supplicant

$CMD &

Remember to use a value for WLAN corresponding to you wifi …

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Slackware: keep Gradle up-to-date

Using AndroidStudio to develop mobile apps requires you to always have an updated installation of Gradle, doing so on a Slackware system could lead to quite a lot of manual work. To help me in the process i created a small tool that on its own downloads and makes a Gradle Slackware package (thanks to these SlackBuilds). To use …

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