Improvements to forwarding hosts in Postfix

- No more premature EOF and no more leaking of bash processes
- Log result
- Correctly treat non-CIDR entries
- Adapt to schema change from df71e97
- Correctly report SQL failure

data/conf/postfix/whitelist_forwardinghosts.sh

@@ -1,11 +1,12 @@
 #!/bin/bash
 
-while true; do
-	read QUERY
+while read QUERY; do
 	QUERY=($QUERY)
 	if [ "${QUERY[0]}" != "get" ]; then
 		echo "500 dunno"
 		continue
 	fi
-	echo $(curl -s http://172.22.1.251:8081/forwardinghosts.php?host=${QUERY[1]})
+	result=$(curl -s http://172.22.1.251:8081/forwardinghosts.php?host=${QUERY[1]})
+	logger -t whitelist_forwardinghosts -p mail.info "Look up ${QUERY[1]} on whitelist, result $result"
+	echo $result
 done