#!/bin/bash
YUM=$(which yum)
#####
if [ "$YUM" ]; then
echo > /etc/sysctl.conf
##
tee -a /etc/sysctl.conf <<EOF
net.ipv6.conf.default.disable_ipv6 = 0
net.ipv6.conf.all.disable_ipv6 = 0
EOF
##
sysctl -p
IPC=$(curl -4 -s icanhazip.com | cut -d"." -f3)
IPD=$(curl -4 -s icanhazip.com | cut -d"." -f4)
##
if [ $IPC == 4 ]
then
   tee -a /etc/sysconfig/network-scripts/ifcfg-eth0 <<-EOF
	IPV6INIT=yes
	IPV6_AUTOCONF=no
	IPV6_DEFROUTE=yes
	IPV6_FAILURE_FATAL=no
	IPV6_ADDR_GEN_MODE=stable-privacy
	IPV6ADDR=2403:6a40:0:40::$IPD:0000/64
	IPV6_DEFAULTGW=2403:6a40:0:40::1
	EOF
elif [ $IPC == 5 ]
then
   tee -a /etc/sysconfig/network-scripts/ifcfg-eth0 <<-EOF
	IPV6INIT=yes
	IPV6_AUTOCONF=no
	IPV6_DEFROUTE=yes
	IPV6_FAILURE_FATAL=no
	IPV6_ADDR_GEN_MODE=stable-privacy
	IPV6ADDR=2403:6a40:0:41::$IPD:0000/64
	IPV6_DEFAULTGW=2403:6a40:0:41::1
	EOF
elif [ $IPC == 244 ]
then
   tee -a /etc/sysconfig/network-scripts/ifcfg-eth0 <<-EOF
	IPV6INIT=yes
	IPV6_AUTOCONF=no
	IPV6_DEFROUTE=yes
	IPV6_FAILURE_FATAL=no
	IPV6_ADDR_GEN_MODE=stable-privacy
	IPV6ADDR=2403:6a40:2000:244::$IPD:0000/64
	IPV6_DEFAULTGW=2403:6a40:2000:244::1
	EOF
else
	tee -a /etc/sysconfig/network-scripts/ifcfg-eth0 <<-EOF
	IPV6INIT=yes
	IPV6_AUTOCONF=no
	IPV6_DEFROUTE=yes
	IPV6_FAILURE_FATAL=no
	IPV6_ADDR_GEN_MODE=stable-privacy
	IPV6ADDR=2403:6a40:0:$IPC::$IPD:0000/64
	IPV6_DEFAULTGW=2403:6a40:0:$IPC::1
	EOF
fi

service network restart

rm -rf ipv6.sh
### Ubuntu  
 else
	ipv4=$(curl -4 -s icanhazip.com)
	IPC=$(curl -4 -s icanhazip.com | cut -d"." -f3)
	IPD=$(curl -4 -s icanhazip.com | cut -d"." -f4)
	INT=$(ls /sys/class/net | grep e)
	if [ "$IPC" = "4" ]; then
		IPV6_ADDRESS="2403:6a40:0:40::$IPD:0000/64"
		PREFIX_LENGTH="64"
		INTERFACE="$INT"
		GATEWAY="2403:6a40:0:40::1"
	elif [ "$IPC" = "5" ]; then
		IPV6_ADDRESS="2403:6a40:0:41::$IPD:0000/64"
		PREFIX_LENGTH="64"
		INTERFACE="$INT"
		GATEWAY="2403:6a40:0:41::1"
	elif [ "$IPC" = "244" ]; then
		IPV6_ADDRESS="2403:6a40:2000:244::$IPD:0000/64"
		PREFIX_LENGTH="64"
		INTERFACE="$INT"
		GATEWAY="2403:6a40:2000:244::1"
	else
		IPV6_ADDRESS="2403:6a40:0:$IPC::$IPD:0000/64"
		PREFIX_LENGTH="64"
		INTERFACE="$INT"
		GATEWAY="2403:6a40:0:$IPC::1"
	fi
	interface_name="$INTERFACE"  # Thay thế bằng tên giao diện mạng của bạn
	ipv6_address="$IPV6_ADDRESS"
	gateway6_address="$GATEWAY"
	# kiểm tra cấu hình card mạng
	if [ "$INT" = "ens160" ]; then
	   netplan_path="/etc/netplan/99-netcfg-vmware.yaml"  # Thay thế bằng đường dẫn tệp cấu hình Netplan của bạn
	   netplan_config=$(cat "$netplan_path")
	   new_netplan_config=$(sed "/gateway4:/i \ \ \ \ \ \ \  - $ipv6_address" <<< "$netplan_config")
	   new_netplan_config=$(sed "/gateway4:.*/a \ \ \ \ \  gateway6: $gateway6_address" <<< "$new_netplan_config")
	elif [ "$INT" = "eth0" ]; then
	   netplan_path="/etc/netplan/50-cloud-init.yaml"
	   netplan_config=$(cat "$netplan_path")
	   # Tạo đoạn cấu hình IPv6 mới
       new_netplan_config=$(sed "/gateway4:/i \ \ \ \ \ \ \ \ \ \ \ \ - $ipv6_address" <<< "$netplan_config")
       # cập nhật gateway ipv6
       new_netplan_config=$(sed "/gateway4:.*/a \ \ \ \ \ \ \ \ \ \ \ \ gateway6: $gateway6_address" <<< "$new_netplan_config")
	else
	   echo 'Khong co card mang phu hop'
	fi
	# Tạo đoạn cấu hình IPv6 mới
	
    # cập nhật gateway ipv6
    
	echo "$new_netplan_config" > "$netplan_path"

	# Áp dụng cấu hình Netplan
	sudo netplan apply
 fi
 echo 'Da tao IPV6 thanh cong!'