Update expected messages.

src/client/lib/dnsmanager-client.cr

@@ -51,7 +51,11 @@ class DNSManager::Client < IPC
 	def user_domain_add(domain : String)
 		request = Request::NewDomain.new domain
 		send_now request
-		parse_message [ Response::Success ], read
+		parse_message [ Response::DomainAdded,
+		                Response::DomainAlreadyExists,
+		                Response::InvalidDomainName,
+		                Response::UnacceptableDomain
+		              ], read
 	end
 
 	# Remove a domain.

src/storage.cr

@@ -133,6 +133,8 @@ class DNSManager::Storage
 		end
 
 		matching_domains.each do |md|
+			# Prevent empty domains (from crafted requests) to be accepted.
+			return Response::InvalidDomainName.new unless (domain.chomp md).size > 2
 			Baguette::Log.info "Add new domain #{domain} (matching domain #{md})"
 		end