Aleksjes Okolovskis aokolovskis

Based on https://controlc.de/2013/09/10/debian-selbstgehosteter-dyndns-dienst/ and https://github.com/Josef-Friedrich/dyndns

For debian 10

apt install -y bind9 bind9-host bind9utils dnsutils unattended-upgrades vim

echo unattended-upgrades unattended-upgrades/enable_auto_updates boolean true | debconf-set-selections
dpkg-reconfigure -f noninteractive unattended-upgrades

Let's Encrypt / Dovecot / Postfix / UFW firewall / Certbot

This tutorial describes how to install TLS to a mail server consisting of Postfix and/or Dovecot by using Let's Encrypt certificates with automatic renewing and firewall management.

The system used for this tutorial was:

$ lsb_release -idrc
Distributor ID: Ubuntu

	Copyright (c) 2021 Aleksejs Okolovskis
	Permission is hereby granted, free of charge, to any person obtaining a copy of this software and associated documentation files (the "Software"), to deal in the Software without restriction, including without limitation the rights to use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies of the Software, and to permit persons to whom the Software is furnished to do so, subject to the following conditions:

	The above copyright notice and this permission notice shall be included in all copies or substantial portions of the Software.

	THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE U


	import java.io.BufferedInputStream;
	import java.io.BufferedReader;
	import java.io.IOException;
	import java.io.InputStreamReader;
	import java.util.HashMap;
	import java.util.Map.Entry;
	import java.util.Random;
	import java.util.Scanner;

	#include <unistd.h>
	#include <CoreServices/CoreServices.h>
	#include <ApplicationServices/ApplicationServices.h>

	typedef int CGSConnection;
	extern OSStatus CGSGetWorkspace(const CGSConnection cid, int *workspace);
	extern OSStatus CGSSetWorkspace(const CGSConnection cid, int workspace);
	extern CGSConnection _CGSDefaultConnection(void);

	int get_space_id(void);