Diff

--- a/mod_dnsupdate/mod_dnsupdate.lua	Mon May 12 12:13:25 2025 +0200
+++ b/mod_dnsupdate/mod_dnsupdate.lua	Mon May 12 12:15:10 2025 +0200
@@ -102,26 +102,31 @@
 	print("ttl " .. tostring(opts.ttl or 60 * 60));
 
 	for _, service in ipairs(services) do
-		local ports = set.new(configured_ports[service]);
-		local records = (async.wait_for(existing_srv[service]));
-		if opts.remove or opts.reset then
+		local config_ports = set.new(configured_ports[service]);
+		local dns_ports = set.new();
+
+		if (opts.reset or opts.remove) and not opts.each then
 			print(("del _%s._tcp.%s IN SRV"):format(service, ihost));
 		else
+			local records = (async.wait_for(existing_srv[service]));
 			for _, rr in ipairs(records) do
-				if ports:contains(rr.srv.port) and target == nameprep(rr.srv.target):gsub("%.$", "") then
-					ports:remove(rr.srv.port)
-				elseif not opts.each then
-					print(("del _%s._tcp.%s IN SRV"):format(service, ihost));
-					break
-				else
+				if target == nameprep(rr.srv.target):gsub("%.$", "") then
+					dns_ports:add(rr.srv.port)
+				elseif opts.each then
 					print(("del _%s._tcp.%s IN SRV %s"):format(service, ihost, rr));
 				end
 			end
 		end
+
 		if not opts.remove then
-			for port in ports do print(("add _%s._tcp.%s IN SRV 1 1 %d %s"):format(service, ihost, port, target)); end
+			if config_ports:empty() then
+				print(("add _%s._tcp.%s IN SRV 0 0 0 ."):format(service, ihost));
+			else
+				for port in (config_ports - dns_ports) do
+					print(("add _%s._tcp.%s IN SRV 1 1 %d %s"):format(service, ihost, port, target));
+				end
+			end
 		end
-		if ports:empty() then print(("add _%s._tcp.%s IN SRV 0 0 0 ."):format(service, ihost)); end
 	end
 
 	print("show");