Use custom resolver for DNSBL lookups

src/app.ts

@@ -340,4 +340,15 @@ enum DataReturnFormat {
   Jsonp = "jsonp",
 }
 
-export { DataReturnFormat };
\ No newline at end of file
+export { DataReturnFormat };
+
+/**
+ * Resolvers to use for DNSBL lookup
+ * 
+ * Related: https://github.com/silverwind/dnsbl/issues/9
+ */
+const dnsblConfiguration = {
+  servers: ["10.250.11.51"],
+};
+
+export { dnsblConfiguration };

src/controllers/ipaddr.controller.ts

 import { NextFunction, Request, Response, Router } from "express";
 import isIp from "is-ip";
-import { promises } from "dns";
+import { promises as dnsPromises } from "dns";
 import axios from "axios";
 import compressIp from "../functions/compressIp";
 import dnsbl from "dnsbl";
+import { dnsblConfiguration } from "../app";
 
 const router: Router = Router();
 
@@ -24,7 +25,7 @@ router.get("/:ip", (req: Request, res: Response, next: NextFunction) => {
       res.redirect(301, `/ip/${compressedIp}`);
     } else {
       Promise.all([
-        promises.reverse(ipAddress).catch(catcher),
+        dnsPromises.reverse(ipAddress).catch(catcher),
         axios.get(`https://api.telcodb.net/v1/bgpann?format=json&q=${ipAddress}`).catch(catcher),
       ])
         .then(async result => {
@@ -70,8 +71,8 @@ router.get("/:ip", (req: Request, res: Response, next: NextFunction) => {
             full: false,
           };
 
-          bogon.traditional = await dnsbl.lookup(ipAddress, 'bogons.cymru.com');
-          bogon.full        = await dnsbl.lookup(ipAddress, `v${ipVersion}.fullbogons.cymru.com`);
+          bogon.traditional = await dnsbl.lookup(ipAddress, 'bogons.cymru.com', dnsblConfiguration);
+          bogon.full        = await dnsbl.lookup(ipAddress, `v${ipVersion}.fullbogons.cymru.com`, dnsblConfiguration);
 
           /**
            * Tor relay data
@@ -88,8 +89,8 @@ router.get("/:ip", (req: Request, res: Response, next: NextFunction) => {
             fingerprint: undefined,
           }
 
-          torRelay.isRelay = await dnsbl.lookup(ipAddress, 'tor.dan.me.uk');
-          torRelay.isExit = await dnsbl.lookup(ipAddress, 'torexit.dan.me.uk');
+          torRelay.isRelay = await dnsbl.lookup(ipAddress, 'tor.dan.me.uk', dnsblConfiguration);
+          torRelay.isExit = await dnsbl.lookup(ipAddress, 'torexit.dan.me.uk', dnsblConfiguration);
 
           res.render("ip/show.twig", {
             // "title": `${ipAddress} - ${reverse} - ${country} - ${isp} - IP address geolocation`,