feat(domain-intelligence): add domain intelligence lookups with RDAP and DNS enrichment

ts/smartnetwork.classes.ipintelligence.ts

@@ -50,6 +50,13 @@ export interface IIpIntelligenceOptions {
   dbMaxAge?: number;
   /** Timeout (ms) for RDAP/DNS/CDN requests. Default: 5000 */
   timeout?: number;
+  /**
+   * Optional injected smartdns client. When provided, IpIntelligence will
+   * not create or destroy its own client (the owner — typically SmartNetwork —
+   * manages lifecycle). When omitted, a short-lived client is created per
+   * Team Cymru lookup and destroyed in finally.
+   */
+  dnsClient?: InstanceType<typeof plugins.smartdns.dnsClientMod.Smartdns>;
 }
 
 // CDN URLs for GeoLite2 MMDB files (served via jsDelivr from npm packages)
@@ -93,9 +100,13 @@ export class IpIntelligence {
   private bootstrapEntries: IBootstrapEntry[] | null = null;
   private bootstrapPromise: Promise<void> | null = null;
 
+  // Optional injected smartdns client (shared by SmartNetwork)
+  private readonly sharedDnsClient: InstanceType<typeof plugins.smartdns.dnsClientMod.Smartdns> | null;
+
   constructor(options?: IIpIntelligenceOptions) {
     this.dbMaxAge = options?.dbMaxAge ?? DEFAULT_DB_MAX_AGE;
     this.timeout = options?.timeout ?? DEFAULT_TIMEOUT;
+    this.sharedDnsClient = options?.dnsClient ?? null;
   }
 
   /**
@@ -385,16 +396,19 @@ export class IpIntelligence {
    * Response: "ASN | prefix | CC | rir | date"
    */
   private async queryTeamCymru(ip: string): Promise<{ asn: number; prefix: string; country: string } | null> {
-    let dnsClient: InstanceType<typeof plugins.smartdns.dnsClientMod.Smartdns> | null = null;
+    const external = this.sharedDnsClient !== null;
+    let dnsClient = this.sharedDnsClient;
     try {
       const reversed = ip.split('.').reverse().join('.');
       const queryName = `${reversed}.origin.asn.cymru.com`;
 
-      dnsClient = new plugins.smartdns.dnsClientMod.Smartdns({
-        strategy: 'prefer-system',
-        allowDohFallback: true,
-        timeoutMs: this.timeout,
-      });
+      if (!dnsClient) {
+        dnsClient = new plugins.smartdns.dnsClientMod.Smartdns({
+          strategy: 'prefer-system',
+          allowDohFallback: true,
+          timeoutMs: this.timeout,
+        });
+      }
 
       const records = await dnsClient.getRecordsTxt(queryName);
       if (!records || records.length === 0) return null;
@@ -418,7 +432,8 @@ export class IpIntelligence {
       this.logger.debug?.(`Team Cymru DNS query failed for ${ip}: ${err.message}`);
       return null;
     } finally {
-      if (dnsClient) {
+      // Only destroy clients we created ourselves; leave injected ones alone.
+      if (!external && dnsClient) {
         dnsClient.destroy();
       }
     }