Option to select no dynamic dns provider

src/freedombone-config

         data=$(tempfile 2>/dev/null)
         trap "rm -f $data" 0 1 2 5 15
         dialog --backtitle $"Freedombone Configuration" \
-               --radiolist $"Choose Dynamic DNS provider:" 15 40 14 \
+               --radiolist $"Choose Dynamic DNS provider:" 16 40 15 \
                1 dyndns off \
                2 freedns on \
                3 zoneedit off \
                11 dynsip off \
                12 sitelutions off \
                13 dnsexit off \
-               14 changeip off 2> $data
+               13 changeip off \
+               14 none off 2> $data
         sel=$?
         case $sel in
             1) exit 1;;
             12) DDNS_PROVIDER="default@sitelutions.com";;
             13) DDNS_PROVIDER="default@dnsexit.com";;
             14) DDNS_PROVIDER="default@changeip.com";;
+            15) DDNS_PROVIDER="none";;
             255) exit 1;;
         esac
         save_configuration_values
 
         valid_ddns_username=
-        while [ ! $valid_ddns_username ]
-        do
-            data=$(tempfile 2>/dev/null)
-            trap "rm -f $data" 0 1 2 5 15
-            dialog --backtitle $"Freedombone Configuration" \
-                   --inputbox $"Dynamic DNS provider username" 10 30 "$(grep 'DDNS_USERNAME' temp.cfg | awk -F '=' '{print $2}')" 2> $data
-            sel=$?
-            case $sel in
-                0)  possible_username=$(cat $data)
-                    if [ "$possible_username" ]; then
-                        if [ ${#possible_username} -gt 1 ]; then
-                            valid_ddns_username=$(cat $data)
-                            DDNS_USERNAME=$valid_ddns_username
-                            break;
+        valid_ddns_password=
+        if [[ "$DDNS_PROVIDER" == "none" ]]; then
+            if [ -f /etc/systemd/system/inadyn.service ]; then
+                systemctl stop inadyn
+                systemctl disable inadyn
+            fi
+        else
+            while [ ! $valid_ddns_username ]
+            do
+                data=$(tempfile 2>/dev/null)
+                trap "rm -f $data" 0 1 2 5 15
+                dialog --backtitle $"Freedombone Configuration" \
+                       --inputbox $"Dynamic DNS provider username" 10 30 "$(grep 'DDNS_USERNAME' temp.cfg | awk -F '=' '{print $2}')" 2> $data
+                sel=$?
+                case $sel in
+                    0)  possible_username=$(cat $data)
+                        if [ "$possible_username" ]; then
+                            if [ ${#possible_username} -gt 1 ]; then
+                                valid_ddns_username=$(cat $data)
+                                DDNS_USERNAME=$valid_ddns_username
+                                break;
+                            fi
                         fi
-                    fi
-                    ;;
-                1) exit 1;;
-                255) exit 1;;
-            esac
-        done
-        save_configuration_values
+                        ;;
+                    1) exit 1;;
+                    255) exit 1;;
+                esac
+            done
+            save_configuration_values
 
-        valid_ddns_password=
-        while [ ! $valid_ddns_password ]
-        do
-            data=$(tempfile 2>/dev/null)
-            trap "rm -f $data" 0 1 2 5 15
-            dialog --backtitle $"Freedombone Configuration" \
-                   --clear \
-                   --insecure \
-                   --passwordbox $"Dynamic DNS provider password" 10 30 "$(grep 'DDNS_PASSWORD' temp.cfg | awk -F '=' '{print $2}')" 2> $data
-            sel=$?
-            case $sel in
-                0)  possible_password=$(cat $data)
-                    if [ "$possible_password" ]; then
-                        if [ ${#possible_password} -gt 1 ]; then
-                            valid_ddns_password=$(cat $data)
-                            DDNS_PASSWORD=$valid_ddns_password
-                            break;
+            while [ ! $valid_ddns_password ]
+            do
+                data=$(tempfile 2>/dev/null)
+                trap "rm -f $data" 0 1 2 5 15
+                dialog --backtitle $"Freedombone Configuration" \
+                       --clear \
+                       --insecure \
+                       --passwordbox $"Dynamic DNS provider password" 10 30 "$(grep 'DDNS_PASSWORD' temp.cfg | awk -F '=' '{print $2}')" 2> $data
+                sel=$?
+                case $sel in
+                    0)  possible_password=$(cat $data)
+                        if [ "$possible_password" ]; then
+                            if [ ${#possible_password} -gt 1 ]; then
+                                valid_ddns_password=$(cat $data)
+                                DDNS_PASSWORD=$valid_ddns_password
+                                break;
+                            fi
                         fi
-                    fi
-                    ;;
-                1) exit 1;;
-                255) exit 1;;
-            esac
-            if [ ${#DDNS_PASSWORD} -lt $MINIMUM_PASSWORD_LENGTH ]; then
-                dialog --title $"Password quality check" --msgbox $"The password given was too short. It must be at least $MINIMUM_PASSWORD_LENGTH characters. You may need to change your password on the dynamic DNS provider's web site." 10 40
-                DDNS_PASSWORD=""
-            fi
-        done
-        save_configuration_values
+                        ;;
+                    1) exit 1;;
+                    255) exit 1;;
+                esac
+                if [ ${#DDNS_PASSWORD} -lt $MINIMUM_PASSWORD_LENGTH ]; then
+                    dialog --title $"Password quality check" --msgbox $"The password given was too short. It must be at least $MINIMUM_PASSWORD_LENGTH characters. You may need to change your password on the dynamic DNS provider's web site." 10 40
+                    DDNS_PASSWORD=""
+                fi
+            done
+            save_configuration_values
+        fi
     fi
 }