fix(net): enable family fallback for pinned SSRF dispatcher

src/infra/net/ssrf.dispatcher.test.ts

@@ -0,0 +1,35 @@
+import { describe, expect, it, vi } from "vitest";
+
+const { agentCtor } = vi.hoisted(() => ({
+  agentCtor: vi.fn(function MockAgent(this: { options: unknown }, options: unknown) {
+    this.options = options;
+  }),
+}));
+
+vi.mock("undici", () => ({
+  Agent: agentCtor,
+}));
+
+import { createPinnedDispatcher, type PinnedHostname } from "./ssrf.js";
+
+describe("createPinnedDispatcher", () => {
+  it("enables network family auto-selection for pinned lookups", () => {
+    const lookup = vi.fn();
+    const pinned: PinnedHostname = {
+      hostname: "api.telegram.org",
+      addresses: ["149.154.167.220"],
+      lookup,
+    };
+
+    const dispatcher = createPinnedDispatcher(pinned);
+
+    expect(dispatcher).toBeDefined();
+    expect(agentCtor).toHaveBeenCalledWith({
+      connect: {
+        lookup,
+        autoSelectFamily: true,
+        autoSelectFamilyAttemptTimeout: 300,
+      },
+    });
+  });
+});

src/infra/net/ssrf.ts

@@ -296,6 +296,8 @@ export function createPinnedDispatcher(pinned: PinnedHostname): Dispatcher {
   return new Agent({
     connect: {
       lookup: pinned.lookup,
+      autoSelectFamily: true,
+      autoSelectFamilyAttemptTimeout: 300,
     },
   });
 }