Nov 152011
 

Someone asked me if i can make a perl scripts that can change the ip address based on time interval, say he want ip address 1.2.3.4 used within one hour, if done next ip address will be used within next one hour..and so on. when it came to highest number of ip address in array, they will be reset back to the start. first i suggest him to look at the articles i wrote. But then i decide to write Perl script which was made for the purposes mention above.

here we are..

Postfix section:

master.cf
127.0.0.1:2527 inet  n       n       n       -       0      spawn
          user=nobody argv=/etc/postfix/ip_by_time.pl

ip1  unix -       -       n       -       -       smtp
          -o syslog_name=postfix-ip1
          -o smtp_helo_name=smtp1.example.com
          -o smtp_bind_address=1.2.3.1

ip2  unix -       -       n       -       -       smtp
          -o syslog_name=postfix-ip2
          -o smtp_helo_name=smtp2.example.com
          -o smtp_bind_address=1.2.3.2

ip3  unix -       -       n       -       -       smtp
          -o syslog_name=postfix-ip3
          -o smtp_helo_name=smtp3.example.com
          -o smtp_bind_address=1.2.3.3

ip4  unix -       -       n       -       -       smtp
          -o syslog_name=postfix-ip4
          -o smtp_helo_name=smtp4.example.com
          -o smtp_bind_address=1.2.3.4
....
....

main.cf

transport_maps = tcp:[127.0.0.1]:2527
127.0.0.1:2527_time_limit = 3600s


Perl section:

#!/usr/bin/perl
use strict;
use warnings;
use Storable;

## interval between ip switchover, one hour for example
my $ip_interval=3600;

my $hashfile="data.hash";
store {}, $hashfile unless -r $hashfile;

my @smtp_array = (
'ip1:',
'ip2:',
'ip3:',
'ip4:',
'ip5:',
'ip6:',
'ip7:',
'ip8:',
'ip9:',
'ip:'
);
# and more ips

#
# Autoflush standard output.
#
select STDOUT; $|++;

while (<>) {
        chomp;
        my $time_stamp = retrieve($hashfile);
        my $now = time();

        if (!defined $time_stamp->{'time_diff'}) {
                $time_stamp->{'time_diff'} = $now;
                $time_stamp->{'ip_index'} = 0;
                store $time_stamp, $hashfile;
        }

        if (/^get\s(.+)$/i) {
                if ($now > $time_stamp->{'time_diff'} + $ip_interval) {
                        if ($time_stamp->{'ip_index'} < scalar(@smtp_array) - 1) {
                                $time_stamp->{'ip_index'}++;
                        } else {
                                $time_stamp->{'ip_index'} = 0;
                        }
                        print "200 $smtp_array[$time_stamp->{'ip_index'}]\n";
                        $time_stamp->{'time_diff'} = $now;
                        store $time_stamp, $hashfile;
                        next;
                } else {
                        print "200 $smtp_array[$time_stamp->{'ip_index'}]\n";
                        next;
                }
        }

        ## default response 
        print "200 smtp:\n";
}

Good luck.
PS: not tested in real environtment

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  14 Responses to “Postfix Changing Outgoing IP By Time Interval Using TCP_TABLE And Perl”

Comments (14)
  1. Hey can i use this with IEM?

  2. Postfix Multiple IP & Hostname
    Already followed the instruction http://www.linuxmail.info/postfix-multiple-ip-address-smtp-greeting/
    I want that each time using 1 SMTP to send email, it just shows the information of 1 IP & 1 host name in the email header. Now I see that it always shows the information of Main IP & Main Hostname.
    Detail in https://docs.google.com/document/d/1aCk7vvbP341FR2kd4zXqDVkZlE_8DArUrT6wlOZoiH0/edit
    Thank you so much!

  3. try put header_checks in your main.cf to discard certain information

    header_checks = regexp:/etc/postfix/header_checks
    

    /etc/postfix/header_checks

    /^Received:.*s22\.vangxa1\.com.*/ IGNORE
    
  4. Thank you. But I want to use SMTP with IP 184.172.219.242 (s22.vangxa1.com) & remove the main IP information 173.193.98.197 (s27.vangxa1.com). How to make it show the information s22.vangxa1.com only?

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