src: network queries in getReport libuv with --report-exclude-network

Author: Tofandel

src/node_report.cc

@@ -202,7 +202,7 @@ static void WriteNodeReport(Isolate* isolate,
 
   writer.json_arraystart("libuv");
   if (env != nullptr) {
-    uv_walk(env->event_loop(), WalkHandle, static_cast<void*>(&writer));
+    uv_walk(env->event_loop(), exclude_network ? WalkHandleNoNetwork : WalkHandleNetwork, static_cast<void*>(&writer));
 
     writer.json_start();
     writer.json_keyvalue("type", "loop");

src/node_report.h

@@ -19,7 +19,8 @@
 namespace node {
 namespace report {
 // Function declarations - utility functions in src/node_report_utils.cc
-void WalkHandle(uv_handle_t* h, void* arg);
+void WalkHandleNetwork(uv_handle_t* h, void* arg);
+void WalkHandleNoNetwork(uv_handle_t* h, void* arg);
 
 template <typename T>
 std::string ValueToHexString(T value) {

src/node_report_utils.cc

@@ -12,7 +12,8 @@ static constexpr auto null = JSONWriter::Null{};
 static void ReportEndpoint(uv_handle_t* h,
                            struct sockaddr* addr,
                            const char* name,
-                           JSONWriter* writer) {
+                           JSONWriter* writer,
+                           bool exclude_network) {
   if (addr == nullptr) {
     writer->json_keyvalue(name, null);
     return;
@@ -26,7 +27,7 @@ static void ReportEndpoint(uv_handle_t* h,
                          reinterpret_cast<sockaddr_in*>(addr)->sin_port :
                          reinterpret_cast<sockaddr_in6*>(addr)->sin6_port);
 
-  if (uv_getnameinfo(h->loop, &endpoint, nullptr, addr, NI_NUMERICSERV) == 0) {
+  if (!exclude_network && uv_getnameinfo(h->loop, &endpoint, nullptr, addr, NI_NUMERICSERV) == 0) {
     host = endpoint.host;
     DCHECK_EQ(port, std::stoi(endpoint.service));
   } else {
@@ -48,7 +49,7 @@ static void ReportEndpoint(uv_handle_t* h,
 }
 
 // Utility function to format libuv socket information.
-static void ReportEndpoints(uv_handle_t* h, JSONWriter* writer) {
+static void ReportEndpoints(uv_handle_t* h, JSONWriter* writer, bool exclude_network) {
   struct sockaddr_storage addr_storage;
   struct sockaddr* addr = reinterpret_cast<sockaddr*>(&addr_storage);
   uv_any_handle* handle = reinterpret_cast<uv_any_handle*>(h);
@@ -65,7 +66,7 @@ static void ReportEndpoints(uv_handle_t* h, JSONWriter* writer) {
     default:
       break;
   }
-  ReportEndpoint(h, rc == 0 ? addr : nullptr,  "localEndpoint", writer);
+  ReportEndpoint(h, rc == 0 ? addr : nullptr,  "localEndpoint", writer, exclude_network);
 
   switch (h->type) {
     case UV_UDP:
@@ -77,7 +78,7 @@ static void ReportEndpoints(uv_handle_t* h, JSONWriter* writer) {
     default:
       break;
   }
-  ReportEndpoint(h, rc == 0 ? addr : nullptr, "remoteEndpoint", writer);
+  ReportEndpoint(h, rc == 0 ? addr : nullptr, "remoteEndpoint", writer, exclude_network);
 }
 
 // Utility function to format libuv pipe information.
@@ -155,7 +156,7 @@ static void ReportPath(uv_handle_t* h, JSONWriter* writer) {
 }
 
 // Utility function to walk libuv handles.
-void WalkHandle(uv_handle_t* h, void* arg) {
+void WalkHandle(uv_handle_t* h, void* arg, bool exclude_network = false) {
   const char* type = uv_handle_type_name(h->type);
   JSONWriter* writer = static_cast<JSONWriter*>(arg);
   uv_any_handle* handle = reinterpret_cast<uv_any_handle*>(h);
@@ -177,7 +178,7 @@ void WalkHandle(uv_handle_t* h, void* arg) {
       break;
     case UV_TCP:
     case UV_UDP:
-      ReportEndpoints(h, writer);
+      ReportEndpoints(h, writer, exclude_network);
       break;
     case UV_NAMED_PIPE:
       ReportPipeEndpoints(h, writer);
@@ -267,6 +268,11 @@ void WalkHandle(uv_handle_t* h, void* arg) {
   }
   writer->json_end();
 }
-
+void WalkHandleNetwork(uv_handle_t* h, void* arg) {
+  WalkHandle(h, arg, false);
+}
+void WalkHandleNoNetwork(uv_handle_t* h, void* arg) {
+  WalkHandle(h, arg, true);
+}
 }  // namespace report
 }  // namespace node

test/report/test-report-exclude-network.js

@@ -38,4 +38,22 @@ describe('report exclude network option', () => {
     const report = process.report.getReport();
     assert.strictEqual(report.header.networkInterfaces, undefined);
   });
+
+  it('should not do DNS queries in libuv if exclude network', async () => {
+    await fetch('http://127.0.0.1');
+
+    process.report.excludeNetwork = false;
+    let report = process.report.getReport();
+    let tcp = report.libuv.find((uv) => uv.type === 'tcp');
+    assert.notEqual(tcp, null);
+    assert.strictEqual(tcp.localEndpoint.host, 'localhost');
+    assert.strictEqual(tcp.remoteEndpoint.host, 'localhost');
+
+    process.report.excludeNetwork = true;
+    report = process.report.getReport();
+    tcp = report.libuv.find((uv) => uv.type === 'tcp');
+    assert.notEqual(tcp, null);
+    assert.strictEqual(tcp.localEndpoint.host, '127.0.0.1');
+    assert.strictEqual(tcp.remoteEndpoint.host, '127.0.0.1');
+  });
 });