Make Abusix lookup compatible with Dash

config/action.d/complain.conf

@@ -62,8 +62,9 @@ actioncheck =
 # Values:  CMD
 #
 actionban = oifs=${IFS}; 
-              IFS=.; SEP_IP=( <ip> ); set -- ${SEP_IP}; ADDRESSES=$(dig +short -t txt -q $4.$3.$2.$1.abuse-contacts.abusix.org); 
+            REV_IP=$(printf %%s ${IP}. | tac -s.)
-              IFS=,; ADDRESSES=$(echo $ADDRESSES)
+            ADDRESSES=$(dig +short -t txt -q ${REV_IP}abuse-contacts.abusix.org)
+            IFS=,; ADDRESSES=$(echo $ADDRESSES)
             IFS=${oifs}
             IP=<ip>
             if [ ! -z "$ADDRESSES" ]; then