Block requests by reverse DNS record

Thank you, John, this is exactly the snippet I needed to get the lookup to work

For anyone else needing this snippet I've formatted it as code

Not certain I've inserted all the new lines needed.

when RULE_INIT { 
#	Set debug to 0 for no logging 
#	Set debug to 1 to just log blocks 
#	Set debug to 2 to log blocks and valid requests 
 
	set static::debug 1 
 
	#Ensure this points to your Data Group 
	set static::domain_blacklist_dg "domain_block_blacklist" 
 
	#Set IP for your DNS Server 
	set static::my_dns 192.168.10.1 
	#Set name of VS if using a local Virtual Server 
	#set static::my_dns my_dns_vs 
} 
 
 
when CLIENT_ACCEPTED { 
	set do_lookup 1 
	set is_blocked 0 
	set full_domain "" 
	set base_domain "" 
 
	if { $static::debug > 1 } { log local0. "Connection Accepted from IP_Addr:[IP::remote_addr]" } 
} 
 
 
when HTTP_REQUEST { 
	if { $static::debug > 1 } { 
		log local0. "Processing Request from IP_Addr:[IP::remote_addr]" 
		log local0. "Do Lookup: $do_lookup Is Blocked: $is_blocked" 
		log local0. "My_DNS: $static::my_dns" 
	} 
	if { $do_lookup } { 
		# grab the client base domain reverse lookup of IP Address 
		set full_domain [RESOLV::lookup @$static::my_dns inet -ptr [IP::remote_addr]] 
		
		#grab the base domain (top level plus subdomain) from full_domain 
		set base_domain [join [lrange [split $full_domain .] end-1 end] .] 
		set do_lookup 0 
	} 
 
	if { $is_blocked } { 
		if { $static::debug > 0 } { 
			log local0. "IP_Addr:[IP::remote_addr] Reverse_Lookup:$base_domain blacklisted (Already Blocked)" 
			log local0. "Full Domain: $full_domain" } send a TCP reset reject 
		} else { 
			if { [class match $base_domain contains $static::domain_blacklist_dg] } { 
				if { $static::debug > 0 } { 
					log local0. "IP_Addr:[IP::remote_addr] Reverse_Lookup:$base_domain blacklisted (Blocked)" 
					log local0. "Full Domian: $full_domain" 
				} 
				set is_blocked 1 
				
				#send a TCP reset 
				reject 
			} else { 
				if { $static::debug > 1 } { 
					log local0. "IP_Addr:[IP::remote_addr] Reverse_Lookup:$base_domain $full_domain Accepted" 
				} 
			}
		}
}