Add explicit DNS timeout

This makes DNS timeouts occur much more quickly and avoid clients with nonfunctional reverse DNS timing out while waiting for a response to their EHLO requests.
postalserver · Aug 17, 2022 · 6bace2c · 6bace2c
1 parent 9f0697f
commit 6bace2c
Showing 1 changed file with 4 additions and 1 deletion.
diff --git a/lib/postal/smtp_server/client.rb b/lib/postal/smtp_server/client.rb
@@ -105,7 +105,10 @@ def log(text)
       private
 
       def resolve_hostname
-        @hostname = Resolv.new.getname(@ip_address) rescue @ip_address
+        Resolv::DNS.open do |dns|
+          dns.timeouts = [10,5]
+          @hostname = dns.getname(@ip_address) rescue @ip_address
+        end
       end
 
       def proxy(data)