#!bin/bash

a=1
while a==1
 do
	echo ""
	echo "Выберите параметр"
	echo ""
	echo "1. Имя"
	echo "2. Калькулятор маски"
	echo "3. IP-адрес" 
	echo "4. Forward и masquerade"
	echo "5. Перезагрузить машину"
	echo "6. Time zone"
	echo "0. Выход"
	echo ""
	read num
	echo ""


	if (( $num == 0 )); then
		break

	elif (( $num == 1 )); then
		echo "______________________Имя_____________________"
		read -p "Введите имя(isp.au-team.irpo): " name
		hostnamectl set-hostname $name
		exec bash
	elif (( $num == 3)); then
		echo "_____________________Enp0s3_______________________"
		read -p "Введите ip-адрес или пропустите для DHCP: " ip_s3
		if [[ -n $ip_s3 ]]; then
			read -p "Введите шлюз или пропустите: " gt_s3
			cat > /etc/NetworkManager/system-connections/enp0s3.nmconnection << EOF
[connection]
id=enp0s3
uuid=$(uuidgen)
type=ethernet
autoconnect-priority=-999
interface-name=enp0s3
timestamp=$(date +%s)

[ethernet]

[ipv4]
address1=$ip_s3
dns=8.8.8.8
gateway=$gt_s3
method=manual

[ipv6]
addr-gen-mode=eui64
method=disabled

[proxy]
EOF
			chmod 600 /etc/NetworkManager/system-connections/enp0s3.nmconnection
			systemctl restart NetworkManager
		fi
		echo ""
		echo "________________________Enp0s8_________________________"
		read -p "Введите ip-адрес или пропустите: " ip_s8
		if [[ -n $ip_s8 ]]; then
			nmcli connection modify enp0s8 ipv4.method manual ipv4.addresses $ip_s8 ipv6.method disabled
			systemctl restart NetworkManager
		fi
		echo ""
		echo "____________________________Enp0s9____________________________"
		read -p "Введите ip-адрес или пропустите: " ip_s9
		if [[ -n $ip_s9 ]]; then
			nmcli connection modify enp0s9 ipv4.method manual ipv4.addresses $ip_s9 ipv6.method disabled
			systemctl restart NetworkManager
		fi
		echo ""
		echo "___________________________Enp0s10___________________________"
		read -p "Введите ip-адрес или пропустите: " ip_s10
		if [[ -n $ip_s10 ]]; then
			nmcli connection modify enp0s10 ipv4.method manual ipv4.addresses $ip_s10 ipv6.method disabled
			systemctl restart NetworkManager
		fi
		systemctl restart NetworkManager

	elif (( $num == 4 )); then
		echo ""
		echo "_____________________________Forward и Masquerade__________________________"
		sysctl net.ipv4.ip_forward=1 >> /etc/sysctl.conf
		systemctl enable --now iptables
		iptables -F
		read -p "Введите количество ip-адресов для которых необходимо задать Masquerade: " a
		if (( $a == 2 )); then
			if [[ -n $ip_s8 || $ip_s9 ]]; then
				iptables -t nat -A POSTROUTING -s $ip_s8 -o enp0s3 -j MASQUERADE
				iptables -t nat -A POSTROUTING -s $ip_s9 -o enp0s3 -j MASQUERADE
				echo "Готово"
			else
				read -p "Введите ip-адрес для enp0s8(192.168.0.0/30): " ip_s8
				read -p "Введите ip-адрес для enp0s9(192.168.0.0/30): " ip_s9
				iptables -t nat -A POSTROUTING -s $ip_s8 -o enp0s3 -j MASQUERADE
				iptables -t nat -A POSTROUTING -s $ip_s9 -o enp0s3 -j MASQUERADE
			fi
		elif (( $a == 1)); then
			if [[ -n $ip_s8 ]]; then
				iptables -t nat -A POSTROUTING -s $ip_s8 -o enp0s3 -j MASQUERADE
				echo "Готово"
			else
				read -p "Введите ip для enp0s8: " ip_s8
				iptables -t nat -A POSTROUTING -s $ip_s8 -o enp0s3 -j MASQUERADE
			fi
		fi
		iptables-save --file /etc/sysconfig/iptables


	elif (( $num == 5)); then
		read -p "Перезвгрузить?: " r
		if (( $r == n || $r == N)); then
			echo "No"
		else
			reboot
		fi

	elif (( $num == 2)); then
		echo ""
		echo "____________________________Калькулятор____________________________"
		read -p "Введите количество PC: " mask
		mask=$(echo "sqrt($mask)" | bc)
		mask=$((32 - $mask))
		echo $mask
		echo""

	elif (( $num == 6)); then
		echo "For watch time zone inter: timedatectl list-timezones"
		echo "Inter timedatectl set-timezone 'timezone' "

	chmod 600 /etc/sudoers
	fi
done