feat(smartnetwork): Add randomizable port search and switch DNS resolution to @push.rocks/smartdns; export smartdns and update docs

ts/smartnetwork.classes.smartnetwork.ts

@@ -24,6 +24,15 @@ export interface Hop {
   ip: string;
   rtt: number | null;
 }
+
+/**
+ * Options for the findFreePort method
+ */
+export interface IFindFreePortOptions {
+  /** If true, selects a random available port within the range instead of the first one */
+  randomize?: boolean;
+}
+
 export class SmartNetwork {
   /** Static registry for external plugins */
   public static pluginsRegistry: Map<string, any> = new Map();
@@ -148,9 +157,10 @@ export class SmartNetwork {
    * Find the first available port within a given range
    * @param startPort The start of the port range (inclusive)
    * @param endPort The end of the port range (inclusive)
-   * @returns The first available port number, or null if no ports are available
+   * @param options Optional configuration for port selection behavior
+   * @returns The first available port number (or random if options.randomize is true), or null if no ports are available
    */
-  public async findFreePort(startPort: number, endPort: number): Promise<number | null> {
+  public async findFreePort(startPort: number, endPort: number, options?: IFindFreePortOptions): Promise<number | null> {
     // Validate port range
     if (startPort < 1 || startPort > 65535 || endPort < 1 || endPort > 65535) {
       throw new NetworkError('Port numbers must be between 1 and 65535', 'EINVAL');
@@ -159,16 +169,38 @@ export class SmartNetwork {
       throw new NetworkError('Start port must be less than or equal to end port', 'EINVAL');
     }
 
-    // Check each port in the range
-    for (let port = startPort; port <= endPort; port++) {
-      const isUnused = await this.isLocalPortUnused(port);
-      if (isUnused) {
-        return port;
+    // If randomize option is true, collect all available ports and select randomly
+    if (options?.randomize) {
+      const availablePorts: number[] = [];
+      
+      // Scan the range to find all available ports
+      for (let port = startPort; port <= endPort; port++) {
+        const isUnused = await this.isLocalPortUnused(port);
+        if (isUnused) {
+          availablePorts.push(port);
+        }
       }
+      
+      // If there are available ports, select one randomly
+      if (availablePorts.length > 0) {
+        const randomIndex = Math.floor(Math.random() * availablePorts.length);
+        return availablePorts[randomIndex];
+      }
+      
+      // No free port found in the range
+      return null;
+    } else {
+      // Default behavior: return the first available port (sequential search)
+      for (let port = startPort; port <= endPort; port++) {
+        const isUnused = await this.isLocalPortUnused(port);
+        if (isUnused) {
+          return port;
+        }
+      }
+      
+      // No free port found in the range
+      return null;
     }
-
-    // No free port found in the range
-    return null;
   }
 
   /**
@@ -277,13 +309,30 @@ export class SmartNetwork {
     host: string,
   ): Promise<{ A: string[]; AAAA: string[]; MX: { exchange: string; priority: number }[] }> {
     try {
-      const dns = await import('dns');
-      const { resolve4, resolve6, resolveMx } = dns.promises;
-      const [A, AAAA, MX] = await Promise.all([
-        resolve4(host).catch(() => []),
-        resolve6(host).catch(() => []),
-        resolveMx(host).catch(() => []),
+      const dnsClient = new plugins.smartdns.dnsClientMod.Smartdns({
+        strategy: 'prefer-system',  // Try system resolver first (handles localhost), fallback to DoH
+        allowDohFallback: true,
+      });
+      
+      const [aRecords, aaaaRecords, mxRecords] = await Promise.all([
+        dnsClient.getRecordsA(host).catch((): any[] => []),
+        dnsClient.getRecordsAAAA(host).catch((): any[] => []),
+        dnsClient.getRecords(host, 'MX').catch((): any[] => []),
       ]);
+      
+      // Extract values from the record objects
+      const A = aRecords.map((record: any) => record.value);
+      const AAAA = aaaaRecords.map((record: any) => record.value);
+      
+      // Parse MX records - the value contains "priority exchange"
+      const MX = mxRecords.map((record: any) => {
+        const parts = record.value.split(' ');
+        return {
+          priority: parseInt(parts[0], 10),
+          exchange: parts[1] || '',
+        };
+      });
+      
       return { A, AAAA, MX };
     } catch (err: any) {
       throw new NetworkError(err.message, err.code);