filter out IPv4 Tor exit nodes from SFS listed IPs

This list doesn't include IPv6 addresses and SFS includes those as /64
blocks so filtering them out would be a bit more complex.

stopforumspam-update

@@ -20,7 +20,9 @@ if [[ $mode == hourly ]]; then
     curl --fail-with-body https://www.stopforumspam.com/downloads/listed_ip_1.zip | gunzip | awk '{ print $1 " 1;" }' > stopforumspam-listed_ip_1_ipv46.conf.new
     mv stopforumspam-listed_ip_1_ipv46.conf.new stopforumspam-listed_ip_1_ipv46.conf
 
-    cat stopforumspam-listed_ip_30_ipv46.conf stopforumspam-listed_ip_1_ipv46.conf | sort -u > stopforumspam-listed_ip_merged_ipv46.conf
+    curl --fail-with-body https://check.torproject.org/torbulkexitlist | sort -u > torbulkexitlist.txt
+
+    cat stopforumspam-listed_ip_30_ipv46.conf stopforumspam-listed_ip_1_ipv46.conf | sort -u | comm -1 -3 torbulkexitlist.txt - > stopforumspam-listed_ip_merged_ipv46.conf
 
     nginx -s reload
 fi