Month: April 2014

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  • 04
  • Wed

Fix Open Postfix Relay – Unauthenticated Email

If your mail server is left open, anyone can use your SMTP service to send mail, and spammers will use it. This can result in your server being blacklisted and extraneous use of system resources that neither benefit you nor your users. Postfix logoTo secure Postfix, there are a number of functions you can add […]
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  • 04
  • Mon

send: Cannot determine peer address

Looking into IO::Socket at http://search.cpan.org/src/GBARR/IO-1.2301/IO/Socket.pm reveals: [perl] sub send { @_ >= 2 && @_ <= 4 or croak ‘usage: $sock->send(BUF, [FLAGS, [TO]] +)’; my $sock = $_[0]; my $flags = $_[2] || 0; my $peer = $_[3] || $sock->peername; croak ‘send: Cannot determine peer address’ unless($peer); [/perl] So you have to take care that […]
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  • 04
  • Tue

Perl – Is a value decimal, real or a string?

Perl – Is a value decimal, real or a string? To validate if a number is a number using regex. [perl] $number = “12.3”; if ($number =~ /\D/) { print “has nondigits\n” } if ($number =~ /^\d+$/) { print “is a whole number\n” } if ($number =~ /^-?\d+$/) { print “is an integer\n” } if […]
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  • 04
  • Mon

Perl – Basic Fork Example

#!/usr/local/bin/perl   use strict; use warnings;   print "Starting main program\n"; my @childs;   for ( my $count = 1; $count <= 10; $count++) {         my $pid = fork();         if ($pid) {         # parent         #print "pid is $pid, parent $$\n";         push(@childs, $pid);         } elsif ($pid == 0) {                 # child                 sub1($count);                 exit 0;         } else […]
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  • 04
  • Mon

PHP – Basic Fork Example

<?   print "Starting main program\n"; $childs = array();   for ( $count = 1; $count <= 10; $count++) {         $pid = pcntl_fork();         if ( $pid == -1 ) {                 // Fork failed                           echo "Fork failed\n";                 exit(1);         } else if ( $pid ) {                 # parent                 #print "pid is $pid, parent $$\n";                 array_push($childs, $pid);         } […]
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  • 04
  • Mon

UNIX – Fork Explained

Mr. Peabody Explains fork() Introduction How Windows Does It How Unix Does It So Why Do People Want the Unix Way? How does it work in Perl? Introduction UNIX – Fork Explained Say, Mr Peabody. I was just reading through the Perl 5.6 release notes and noticed that a new function called fork() is now […]
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  • 04
  • Thu

Ubuntu – Which Process is Using a port?

Ubuntu – Which Process is Using a port? 1- Find what application/process is using the pro, type: sudo netstat -lpn |grep :8080 and press Enter. You will get an output similar to this one tcp6       0      0 :::8080                 :::*                    LISTEN      6782/java 2- I have got the process Id, which is 6782, now this is the […]
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  • 04
  • Thu

Heart Bleed – Exploit Example Code

Heart Bleed – Exploit Example Code If you need to test your server for the vulnerability, here is a simple Python script… [python] #!/usr/bin/python import sys import struct import socket import time import select import re from optparse import OptionParser options = OptionParser(usage=’%prog server [options]’, description=’Test for SSL heartbeat vulnerability (CVE-2014-0160)’) options.add_option(‘-p’, ‘–port’, type=’int’, default=443, […]
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  • 04
  • Thu

Ubuntu – Update OpenSSL – Fix HeartBleed Vulnerability

In case you haven’t heard, a critical bug in the widely used OpenSSL library has been disclosed this week. http://www.bbc.co.uk/news/technology-26971363 Despite the cool name and vector logo, Heartbleed is one of the scariest security bugs to hit the Internet in a long time.   I was able to query my own server to reveal memory […]
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