Optimize configuration, and add blacklist ip features

package/openwrt/control/postinst

@@ -2,11 +2,25 @@
 
 chmod +x /usr/sbin/smartdns
 chmod +x /etc/init.d/smartdns
+mkdir -p /var/etc/smartdns/
 
 [ "${IPKG_NO_SCRIPT}" = "1" ] && exit 0
+
+if [ ! -f "/var/etc/smartdns/address.conf" ]; then
+    cp /etc/smartdns/address.conf /var/etc/smartdns/address.conf
+fi
+
+if [ ! -f "/var/etc/smartdns/blacklist-ip.conf" ]; then
+    cp /etc/smartdns/blacklist-ip.conf /var/etc/smartdns/blacklist-ip.conf
+fi
+
+if [ ! -f "/var/etc/smartdns/custom.conf" ]; then
+    cp /etc/smartdns/custom.conf /var/etc/smartdns/custom.conf
+fi
+
 . ${IPKG_INSTROOT}/lib/functions.sh
 default_postinst $0 $@
 ret=$?
 /etc/init.d/smartdns enable
-exit $ret
+exit 0