Option to add custom DNS servers.

Solution to Nyr#889

openvpn-install.sh

@@ -191,10 +191,22 @@ if [[ ! -e /etc/openvpn/server/server.conf ]]; then
  echo " 5) Quad9"
  echo " 6) AdGuard"
  read -p "DNS server [1]: " dns
- until [[ -z "$dns" || "$dns" =~ ^[1-6]$ ]]; do
+ until [[ -z "$dns" || "$dns" =~ ^[1-7]$ ]]; do
  echo "$dns: invalid selection."
  read -p "DNS server [1]: " dns
  done
+ if [[ "$dns" == 7 ]]; then
+ read -p "Enter custom DNS server 1: " dns_custom_1
+ until [[ "$dns_custom_1" =~ ^([0-9]{1,3}\.){3}[0-9]{1,3}$ ]]; do
+ echo "$dns_custom_1: invalid DNS server."
+ read -p "Enter custom DNS server 1: " dns_custom_1
+ done
+ read -p "Enter custom DNS server 2: " dns_custom_2
+ until [[ "$dns_custom_2" =~ ^([0-9]{1,3}\.){3}[0-9]{1,3}$ ]]; do
+ echo "$dns_custom_2: invalid DNS server."
+ read -p "Enter custom DNS server 2: " dns_custom_2
+ done
+ fi 
  echo
  echo "Enter a name for the first client:"
  read -p "Name [client]: " unsanitized_client
@@ -321,6 +333,10 @@ server 10.8.0.0 255.255.255.0" > /etc/openvpn/server/server.conf
  echo 'push "dhcp-option DNS 94.140.14.14"' >> /etc/openvpn/server/server.conf
  echo 'push "dhcp-option DNS 94.140.15.15"' >> /etc/openvpn/server/server.conf
  ;;
+ 7)
+ echo 'push "dhcp-option DNS '$dns_custom_1'"' >> /etc/openvpn/server/server.conf
+ echo 'push "dhcp-option DNS '$dns_custom_2'"' >> /etc/openvpn/server/server.conf
+ ;;
  esac
  echo 'push "block-outside-dns"' >> /etc/openvpn/server/server.conf
  echo "keepalive 10 120