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As a network administrator, you have to think like a virus.From the "Windows sources" magazine, July 1997 issue, page 158, "NT admin> Stop network attacks" by David Chernicoff Visit The Light of the LAMP blog for more...
How can I get into a network?
Which points are the most vulnerable?
Once in, what's the easiest path to destruction?
@-moz-document url-prefix [www.google.com] url-prefix [https:] url-prefix [google.com] url-prefix [https:] {
span#mark-all-as-read-split-button { display: none !important; }
}
and enable the Stylish recipe when you want to feel safe. Visit The Light of the LAMP blog for more...
@namespace url [www.w3.org]
@-moz-document domain("facebook.com") {
.fbFeedTickerStory { display: none !important; }
}
Visit The Light of the LAMP blog for more...
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| [HTTPS] Everywhere Preferences window |
<?php
// initialize variables [you have to change them to their proper values]
$dbhost = "localhost";
$dbuser = "dbuser";
$dbpass = "dbpassword";
// connect to MySQL and get all database names
$db = mysql_connect( $dbhost, $dbuser, $dbpass)
or die( "MySQL connection problem: " . mysql_error());
mysql_set_charset( "utf8");
mysql_select_db( "information_schema", $db) or die( mysql_error());
$sql = "SELECT SCHEMA_NAME FROM SCHEMATA";
$u0 = mysql_query( $sql, $db) or die( mysql_error());
$alldb = array();
while ($u1 = mysql_fetch_row( $u0)) { $alldb[] = $u1[ 0]; }
// select each database found and check for active plugins
foreach( $alldb as $adb) {
$conn = mysql_select_db( $adb, $db);
// get *_options table name
$sql = "SHOW TABLES FROM $adb LIKE '%_options'";
$u0 = mysql_query( $sql, $db); // or continue;
while ($u1 = mysql_fetch_row( $u0)) {
if ($opt = $u1[0]) {
// get active plugins list
$sql = "SELECT * FROM $opt WHERE option_name='active_plugins'";
$u00 = mysql_query( $sql, $db);
if ($u01 = mysql_fetch_array( $u00)) {
$apj = $u01[ 'option_value'];
if ($apj) {
$ap = unserialize( $apj);
foreach( $ap as $apv)
echo "Database: $adb >>> $apv\n";
}
}
}
}
}
mysql_close( $db);
?>The output of this script is a list of all active plugins, one for each line, so it can be used in a shell script, for example one can find out how many of them are active:
php show_all_active_plugins.php | wc -l
or find out which blogs are using a certain plugin:
php show_all_active_plugins.php | grep akismet
Disclaimer: as usual, this script works for my setup and, for this reason, I'm sharing it here for everyone interested. I hope it will work for anyone else who tries it, but I cannot guarantee it for every possible situation. Visit The Light of the LAMP blog for more...
Visit The Light of the LAMP blog for more...
Jul 5 13:40:01 agriope2 CRON[971]: (CRON) error (grandchild #974 failed with exit status 1)
Jul 5 13:50:01 agriope2 CRON[7775]: (CRON) error (grandchild #7778 failed with exit status 1)
Jul 5 14:00:01 agriope2 CRON[14520]: (CRON) error (grandchild #14526 failed with exit status 1)
Jul 5 14:00:01 agriope2 CRON[14521]: (CRON) error (grandchild #14531 failed with exit status 1)/etc/cron.d/update-motd, which was scheduled to run every 10 minutes and tried to run /usr/sbin/update-motd. The problem is that /usr/sbin/update-motd was not present any more at its whereabouts, probably because "the functionality formerly provided by update-motd package is now integrated into pam_motd, in libpam-modules" (as the description of update-motd package says)./etc/cron.d/update-motd to another location, just in case I will need it again some time in the future.If you do not want "no mail" to be an error condition (for instance, for cron jobs), use a POSIX-compliant shell and addVisit The Light of the LAMP blog for more...
|| [ $? -eq 1 ]
to the end of the fetchmail command line, note that this leaves 0 untouched, maps 1 to 0, and maps all other codes to 1. See also item #C8 in the FAQ.
look — display lines beginning with a given stringwhich means that, for example, this command:
look what fileis equivalent to this command (with the exception that look ignores all whitespace characters at start):
grep '^what' fileWith this in mind, we can search easily for comment lines in all javascript files:
look '//' *.jsor in .bashrc
look '#' ~/.bashrcFor more, there is always grep, of course. Visit The Light of the LAMP blog for more...
Say you need to fill a file or a sheet of paper (if you print the output) with a range of consecutive dates (or dates with equal space between them). Then, the following PHP one-liner might be handy some day:for ($i=1; $i<=365; $i++) echo date( "Y-m-d", mktime( 0, 0, 0, 1, $i)). "\n";
for ($i=4; $i<=365; $i+=7) [...]Or, for next year's calendar:
for ($i=1; $i<=365; $i++) echo date( "Y-m-d", mktime( 0, 0, 0, 1, $i, 1+date("Y"))). "\n";Don't forget to change 365 with 366 for a leap year. Visit The Light of the LAMP blog for more...
locate -i jquery | grep "jquery.js" | wc -lor the 'full' version:
locate -i jquery | egrep "jquery.*\.js" | wc -land see how many files it 'll report for your hard disk. If there are more than 10 (as in my case), I'd be worried.
I admit that I'm not using Google Wave as much as I can and the main reason for this is the lack of coworkers/colleagues/friends who are actively using it. 
The tool must have a purpose, right?
aptitude install mysql-client-5.1
rm /var/lib/vnstat/eth* /var/lib/vnstat/.eth*
vnstat -u -i eth0
vnstat -u -i eth1
#!/usr/bin/php
<?php
$res = array();
exec( "file *", $res);
foreach( $res as $f) {
list( $fn, $ft) = split( ':', $f);
if (strpos( $ft, "JPEG") !== false) {
rename( $fn, $fn .".jpeg");
} else if (strpos( $ft, "PNG") !== false) {
rename( $fn, $fn .".png");
} else
echo "cannot rename $fn\n";
}
?>
head --bytes=100 /dev/zero | ./test_data
head --bytes=100k /dev/zero | ./test_data
head --bytes=100k /dev/random | ./test_data
yes "testing with sample data" | head -40 | ./test_data
Adobe AIR Application Installerand guide it to the just-downloaded file to start the installation.
Visit The Light of the LAMP blog for more...
#!/bin/bashAll it does is to keep a compressed copy of every file you want to edit in a directory named ".backup", hence I named it "backup2.backup" and I run it as:
datetime=`date +%Y%m%d_%H%M`
bdir=".backup"
mkdir $bdir 2> /dev/null
for a in $*; do
cp -av $a $bdir/$datetime.$a
done
gzip -9 $bdir/$datetime.*
backup2.backup *.php *.htmlIt doesn't check many things, but I'm using it for some time now. Feel free to enhance it as you like it.
style="text-align: right;"to right-align the numbers in a column.
$u0 = mysql_query( $sql, $db) or die( mysql_error());
$aa = array();
while ($u1 = mysql_fetch_row( $u0)) {
$id = $u1[0];
$c1 = $u1[1];
$aa[$id] = number_format($u1[2]/$c1,4) .":". sprintf("%06d", $c1);
}
arsort( $aa); reset( $aa);
while (list($k, $v) = each($aa)) {
list( $v1, $c1) = explode( ":", $v);
$c1 = intval( $c1);
$v1 = round( $v1, 2);
[......]
}
There are cases you need to update a special Twitter feed to inform your visitors about something that has happened to your site. Then, this PHP function might be very useful if you add it in your functions arsenal:
/* inform twitter about something */As you can see, it only takes a string argument; the message you want to send. It returns also a string, which is either a true/false value or an XML-formatted response, depending on the value of CURLOPT_RETURNTRANSFER.
function twit( $msg = "")
{
$username = "twitter-username";
$password = "twitter-password";
$ch = curl_init();
curl_setopt( $ch, CURLOPT_URL, "http://twitter.com/statuses/update.xml");
curl_setopt( $ch, CURLOPT_RETURNTRANSFER, TRUE); // change to FALSE for not reporting XML output
curl_setopt( $ch, CURLOPT_POST, 1);
curl_setopt( $ch, CURLOPT_POSTFIELDS, "status=" . urlencode( $msg));
curl_setopt( $ch, CURLOPT_USERPWD, "$username:$password");
ob_start();
$response = curl_exec( $ch);
ob_end_clean();
curl_close( $ch);
return $response;
}
In order to use this function, you need to have installed the cURL extension of PHP. You can check if it's installed quickly with the following command:
$ php -i | grep -i curl
If cURL is installed, you can expect an output like this:
additional .ini files parsed => /etc/php5/cli/conf.d/curl.ini,
curl
cURL support => enabled
cURL Information => libcurl/7.16.4 OpenSSL/0.9.8e zlib/1.2.3.3 libidn/1.0
If not, the package you need to install is php5-curl.
Visit The Light of the LAMP blog for more...
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