minecraft-server

#!/bin/bash
#::             RTD System System Managment Script
#::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::
#::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::
#:: Author:     Vonschutter
#:: Version:	1.04
#::
#::
#:: Purpose: The purpose of the script is to perform managment tasks on Linux systems
#::
#:: This is a script that will start Minecraft Server on an Ubuntu or Debian (Ubuntu) based server. It will start
#:: multiple panes using "byobu", and start the server etc there...
#::
#::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::
#::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::



#::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::
#::::::::::::::                                          ::::::::::::::::::::::
#::::::::::::::          Script Settings                 ::::::::::::::::::::::
#::::::::::::::                                          ::::::::::::::::::::::
#::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::
# Variables that govern the behavior or the script and location of files are
# set here. There should be no reason to change any of this to setup and
# get a working Minecraft server on Ubuntu. However, if you have updated scripts
# and need to download yours from someplace else you only need to change these
# setings.

# Your Minecraft version (this is a preference only), script will always
# get the latest Minecraft if it does not find a local server.
MINECRAFT_VERSION=Latest

# Your local Minecraft directory.
MINECRAFT_HOME=~/bin/minecraft.server/Minecraft.$MINECRAFT_VERSION
MINECRAFT_JAR=server.jar





#::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::
#::::::::::::::                                          ::::::::::::::::::::::
#::::::::::::::          Script Functions                ::::::::::::::::::::::
#::::::::::::::                                          ::::::::::::::::::::::
#::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::
#

function check_dependencies (){
	# Simple function to check if sofware is available and take action
	# if it is not. Software name must match command to envoke it.
	#---------------------------------------------------------------
	echo "Checking for script dependencies and install if not there..."
	#---------------------------------------------------------------
	if hash "$1" 2>/dev/null; then
		echo "I found that $1 is present on this system... thankyou for that! "
	else
		echo "You seem to have no $1... I will try to get it... "
		install_software "$1"
		if [ $? != 0 ];
		then
			echo "That install didn't work out so well."
			echo "Please manually try to add the software since I couldn't do it."
			exit
		fi
		echo "OK Done! Continuing..."
	fi
}

function install_software (){
	# Simple function to help installing software on several linux distributions
	# Should work on Fedora, SUSE, RedHat, Ubuntu, Debian etc. unless the naming
	# convention of the software package is different between distributions.
	if hash pkcon 2>/dev/null; then
		sudo pkcon -y  install "$@"
	elif hash yum 2>/dev/null; then
		sudo yum -y  install "$@"
	elif hash zypper 2>/dev/null; then
		sudo zypper install -y "$@"
	elif hash apt-get 2>/dev/null; then
		export DEBIAN_FRONTEND=noninteractive
		sudo apt-get -y -qq --allow-change-held-packages --ignore-missing install "$@"
	else
		echo -e $YELLOW "This system does not seem to have a software managment system" $ENDCOLOR
		_cleanup
		exit 1
	fi
}

function setup_minecraft_root (){
	# Setup and initiate the location of the mincraft server.
	# For us i likes to live in /home/$USER/bin/minecraft.server/Minecraft.$VERSION
	# This tests if the script files are available and downloades them if not.
	mkdir -p $MINECRAFT_HOME

	for i in start.sh announce.py server.properties eula.txt
	do
		if [ ! -f "$MINECRAFT_HOME/$i" ]; then
		$i $MINECRAFT_HOME
		fi
	done

	if [ ! -f "$MINECRAFT_HOME/$MINECRAFT_JAR" ]; then
		minecraft_update
	fi
}


function run_minecraft_server_manager (){

	# Start byobu multi screen app...
	byobu new-session -d -s $USER

	# status screen
	byobu rename-window -t $USER:0 'Minecraft Server Manager'
	byobu send-keys "bash $MINECRAFT_HOME/start.sh" C-m

	# Create new pane vertically and display htop
	byobu split-window -v
	byobu send-keys "htop " C-m

	# Split the "htop" window in 2, and start spedometer there.
	byobu split-window -h
	byobu send-keys "speedometer -r $NETINT  -t $NETINT" C-m

	# Create new window...
	byobu new-window -t $USER:1 -n 'Anouncing on Network (Press F4 to switch between windows)'
	byobu send-keys "python3 $MINECRAFT_HOME/announce.py" C-m

	# Set default window as the dev split plane
	byobu select-window -t $USER:0
	byobu-tmux select-pane -t 0

	# Attach to the session you just created
	byobu attach-session -t $USER
}


function check_java (){
	~/bin/java/bin/java --version >/dev/null
	if [ $? -eq 0 ]; then
		echo "java of some version is present. I respect your choice... and will try to run! --- OK!"
	else
		echo Java is now present where expected... will now download:
		wget https://download.oracle.com/java/19/latest/jdk-19_linux-x64_bin.tar.gz
		mkdir ~/bin/java && tar xzvf jdk-19_linux-x64_bin.tar.gz --directory ~/bin/java/ --strip 1
		#check_dependencies default-jre
	fi
}


function find_active_newtork_interface (){
	# Detect the name of the active network interface.
	NETINT=$(ip addr | awk '/state UP/ {print $2}' |grep -v "br*" |grep -v "wlp*" | head --bytes -2 )
	echo "Active network interface is: $NETINT"
	export NETINT
}


 function minecraft_update() {
	# Get minecraft version publication file and get the latest server URL
	# This is an unneccessarily complicated way by Mojang!
	cd $MINECRAFT_HOME || { echo "Failure change to Minecraft folder. Is it there?"; exit 1; }
	wget -q -O $MINECRAFT_HOME/versions --no-check-certificate https://launchermeta.mojang.com/mc/game/version_manifest.json
	JSONVERSION=$(cat versions | python3 -c "exec(\"import json,sys\nobj=json.load(sys.stdin)\nversion=obj['latest']['release']\nfor v in obj['versions']:\n   if v['id']==version:\n    print(v['url'])\")")
	wget -q -O $MINECRAFT_HOME/versions --no-check-certificate $JSONVERSION
	MC_SERVER_URL=$(cat versions | python3 -c 'import json,sys;obj=json.load(sys.stdin);print(obj["downloads"]["server"]["url"])')
	rm $MINECRAFT_HOME/versions

	# Download the latest minecraft vesrion and check if it is the same as the one installed
	wget -q -O $MINECRAFT_HOME/minecraft_server.jar.update --no-check-certificate $MC_SERVER_URL
	if [ -f $MINECRAFT_HOME/minecraft_server.jar.update ] ; then
		if diff $MINECRAFT_HOME/$MINECRAFT_JAR $MINECRAFT_HOME/minecraft_server.jar.update >/dev/null ; then
			dialog --title 'Minecraft Update' --msgbox "You are already running the latest version of $MINECRAFT_JAR." 0 0
	else
		mv $MINECRAFT_JAR $MINECRAFT_JAR.previous
		mv $MINECRAFT_HOME/minecraft_server.jar.update $MINECRAFT_HOME/$MINECRAFT_JAR
		dialog --title 'Minecraft Update' --msgbox "Minecraft successfully updated." 0 0
	fi
	else
		dialog --title 'Minecraft Update' --msgbox "Minecraft update could not be downloaded." 0 0
		echo
	fi
}


#::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::
#::::::::::::::                                          ::::::::::::::::::::::
#::::::::::::::    Script internal config repository     ::::::::::::::::::::::
#::::::::::::::                                          ::::::::::::::::::::::
#::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::
# This section contains content to written out to several configuration
# files and external scripts.


announce.py () {
	cat >> $1/announce.py <<-'EOF'
#!/bin/python3
#              RTD System System Managment Script
# :::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::
# :::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::
# :: Author:     generated by minecraft.server
# :: Version 1.02
# ::
# ::
# :: Purpose: The purpose of the script is to:
# ::          1 - Broadcast service availability to the local network.
# ::              This script is used to broadcast the minecraft server on the
# ::              same machine (see "servers"). You may have as many minecraft
# ::              servers running and broadcast as you like.
# :::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::
# :::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::

import socket
import time
import sys
import os
import urllib.request

servers = [
    ["Local Network - Minecraft Server", 25565],
]

BROADCAST_IP = "255.255.255.255"
BROADCAST_PORT = 4445

sock = socket.socket(socket.AF_INET, socket.SOCK_DGRAM)
sock.setsockopt(socket.SOL_SOCKET, socket.SO_BROADCAST, 1)

print("Broadcasting Minecraft servers to LAN on: " + os.environ['NETINT'])
print("Local IP adress: ")
print((([ip for ip in socket.gethostbyname_ex(socket.gethostname())[2] if not ip.startswith("127.")] or [[(s.connect(("8.8.8.8", 53)), s.getsockname()[0], s.close()) for s in [socket.socket(socket.AF_INET, socket.SOCK_DGRAM)]][0][1]]) + ["no IP found"])[0])

print("External IP address visible on the internet: ")
external_ip = urllib.request.urlopen('https://ident.me').read().decode('utf8')
print(external_ip)

while True:
    for server in servers:
        msg = "[MOTD]%s[/MOTD][AD]%d[/AD]" % (server[0], server[1])
        encode = str.encode(msg)
        sock.sendto(encode, (BROADCAST_IP, BROADCAST_PORT))
    time.sleep(3)
	EOF
}


start.sh () {
	cat >> $1/start.sh <<-'EOF'
#!/bin/bash
#::             RTD System System Managment Script
#::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::
#::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::
#:: Author:     generated by minecraft.server
#:: Version 1.00
#::
#::
#:: Purpose: The purpose of the script is to:
#::          1 - Launch Minecraft
#::          2 - Check that Minecraft runs for at least one minute
#::          3 - If Minecraft crashes or quits after one minute, restart Minecraft
#::
#::
#::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::
#::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::

pushd $(dirname "$0")

MC_SERVER_NAME=`cat server.properties |grep "motd=.*" `
export $MC_SERVER_NAME

while true; do

    start_epoch=$(date +%s)
    echo Starting Minecraft server $MC_SERVER_NAME ....
    ~/bin/java/bin/java -Xmx2048M -Xms2048M -jar $(dirname "$0")/server.jar noggui broadcast

    # Abort if the application exited too quickly
    duration=$(( $(date +%s) - $start_epoch ))
    if [[ "$duration" < 60 ]]; then
        echo "Program exited too quickly! Aborting Minecraft Launcher...."
        exit
    fi

done

exit
	EOF
}


server.properties () {
	cat >> $1/server.properties <<-'EOF'
# Minecraft server properties
# generated by minecraft.server
broadcast-rcon-to-ops=true
view-distance=6
max-build-height=256
server-ip=
rcon.port=25575
level-seed=
allow-nether=true
gamemode=survival
enable-command-block=true
server-port=25565
enable-rcon=false
enable-query=true
op-permission-level=3
prevent-proxy-connections=false
generator-settings=
resource-pack=
player-idle-timeout=0
level-name=world
rcon.password=
motd=\u00A7d CuteWorld
query.port=25565
force-gamemode=true
debug=false
hardcore=false
white-list=false
broadcast-console-to-ops=true
pvp=true
spawn-npcs=true
spawn-animals=true
generate-structures=true
snooper-enabled=false
difficulty=normal
network-compression-threshold=256
level-type=default
max-tick-time=-1
spawn-monsters=true
enforce-whitelist=false
max-players=10
use-native-transport=true
spawn-protection=16
resource-pack-sha1=
online-mode=true
allow-flight=false
max-world-size=29999984
	EOF
}

eula.txt () {
	cat >> $1/eula.txt <<-'EOF'
#By changing the setting below to TRUE you are indicating your agreement to our EULA (https://account.mojang.com/documents/minecraft_eula).
#Sun Feb 26 16:57:58 CET 2017
eula=true
	EOF
}


# File write template. Takes one argument "where to put the file"
filetowrite.txt () {
	cat >> $1/filetowrite.txt <<-'EOF'

	EOF
}

#::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::
#::::::::::::::                                          ::::::::::::::::::::::
#::::::::::::::          Script Executive                ::::::::::::::::::::::
#::::::::::::::                                          ::::::::::::::::::::::
#::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::


# Check that the software components of this script are available.
# iff they are not, attempt to install them.
for i in byobu speedometer htop python3 dialog
do
	check_dependencies $i
done

if echo "$@" | grep "update" ;then
	dialog --title "Update to latest Minecraft?"  --yesno "You have requested that I try to get the latest verion of Minecraft from Mojang. This means that the people playing in the server also will need the latest version. Is this OK?" 0 0
		case $? in
		0)
		minecraft_update ;;
		1)
		echo "Proceeding without update...";;
		255)
		echo "ESC pressed.";;
		esac
fi

# Basic check to see that the Minecraft folder is present and
# if not crate it and download the scripts and the server jar file
# to enable the server.
setup_minecraft_root
check_java

# Start the server and monitor the server performance
find_active_newtork_interface
run_minecraft_server_manager