report: add fallback for uv_getnameinfo() failures

Attempt to report the host and port in the case that uv_getnameinfo()
fails.

PR-URL: https://github.com/nodejs/node/pull/26140
Reviewed-By: Anna Henningsen <anna@addaleax.net>
Reviewed-By: Colin Ihrig <cjihrig@gmail.com>

src/node_report_utils.cc

@@ -7,6 +7,45 @@ using node::MallocedBuffer;
 
 static constexpr auto null = JSONWriter::Null{};
 
+// Utility function to format socket information.
+static void ReportEndpoint(uv_handle_t* h,
+                           struct sockaddr* addr,
+                           const char* name,
+                           JSONWriter* writer) {
+  if (addr == nullptr) {
+    writer->json_keyvalue(name, null);
+    return;
+  }
+
+  uv_getnameinfo_t endpoint;
+  char* host = nullptr;
+  char hostbuf[INET6_ADDRSTRLEN];
+  const int family = addr->sa_family;
+  const int port = ntohs(family == AF_INET ?
+                         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) {
+    host = endpoint.host;
+    DCHECK_EQ(port, std::stoi(endpoint.service));
+  } else {
+    const void* src = family == AF_INET ?
+                      static_cast<void*>(
+                        &(reinterpret_cast<sockaddr_in*>(addr)->sin_addr)) :
+                      static_cast<void*>(
+                        &(reinterpret_cast<sockaddr_in6*>(addr)->sin6_addr));
+    if (uv_inet_ntop(family, src, hostbuf, sizeof(hostbuf)) == 0) {
+      host = hostbuf;
+    }
+  }
+  writer->json_objectstart(name);
+  if (host != nullptr) {
+    writer->json_keyvalue("host", host);
+  }
+  writer->json_keyvalue("port", port);
+  writer->json_objectend();
+}
+
 // Utility function to format libuv socket information.
 static void ReportEndpoints(uv_handle_t* h, JSONWriter* writer) {
   struct sockaddr_storage addr_storage;
@@ -14,8 +53,6 @@ static void ReportEndpoints(uv_handle_t* h, JSONWriter* writer) {
   uv_any_handle* handle = reinterpret_cast<uv_any_handle*>(h);
   int addr_size = sizeof(addr_storage);
   int rc = -1;
-  bool wrote_local_endpoint = false;
-  bool wrote_remote_endpoint = false;
 
   switch (h->type) {
     case UV_UDP:
@@ -27,38 +64,13 @@ static void ReportEndpoints(uv_handle_t* h, JSONWriter* writer) {
     default:
       break;
   }
-  if (rc == 0) {
+  ReportEndpoint(h, rc == 0 ? addr : nullptr,  "localEndpoint", writer);
-    // uv_getnameinfo will format host and port and handle IPv4/IPv6.
-    uv_getnameinfo_t local;
-    rc = uv_getnameinfo(h->loop, &local, nullptr, addr, NI_NUMERICSERV);
-
-    if (rc == 0) {
-      writer->json_objectstart("localEndpoint");
-      writer->json_keyvalue("host", local.host);
-      writer->json_keyvalue("port", local.service);
-      writer->json_objectend();
-      wrote_local_endpoint = true;
-    }
-  }
-  if (!wrote_local_endpoint) writer->json_keyvalue("localEndpoint", null);
 
   if (h->type == UV_TCP) {
     // Get the remote end of the connection.
     rc = uv_tcp_getpeername(&handle->tcp, addr, &addr_size);
-    if (rc == 0) {
+    ReportEndpoint(h, rc == 0 ? addr : nullptr, "remoteEndpoint", writer);
-      uv_getnameinfo_t remote;
-      rc = uv_getnameinfo(h->loop, &remote, nullptr, addr, NI_NUMERICSERV);
-
-      if (rc == 0) {
-        writer->json_objectstart("remoteEndpoint");
-        writer->json_keyvalue("host", remote.host);
-        writer->json_keyvalue("port", remote.service);
-        writer->json_objectend();
-        wrote_local_endpoint = true;
-      }
-    }
   }
-  if (!wrote_remote_endpoint) writer->json_keyvalue("remoteEndpoint", null);
 }
 
 // Utility function to format libuv path information.

test/node-report/test-api-uvhandles.js

@@ -60,9 +60,7 @@ if (process.argv[2] === 'child') {
     const data = { pid: child_process.pid,
                    tcp_address: server.address(),
                    udp_address: udp_socket.address(),
-                   skip_fs_watch: (watcher === undefined ?
+                   skip_fs_watch: (watcher === undefined) };
-                     'fs.watch() unavailable' :
-                     false) };
     process.send(data);
     http.get({ port: server.address().port });
   });
@@ -74,6 +72,8 @@ if (process.argv[2] === 'child') {
   tmpdir.refresh();
   const options = { encoding: 'utf8', silent: true, cwd: tmpdir.path };
   const child = fork('--experimental-report', [__filename, 'child'], options);
+  let child_data;
+  child.on('message', (data) => { child_data = data; });
   let stderr = '';
   child.stderr.on('data', (chunk) => { stderr += chunk; });
   let stdout = '';
@@ -94,36 +94,61 @@ if (process.argv[2] === 'child') {
     assert.deepStrictEqual(reports, [], report_msg, reports);
 
     const report = JSON.parse(stdout);
-    let fs = 0;
+    const prefix = common.isWindows ? '\\\\?\\' : '';
-    let poll = 0;
+    const expected_filename = `${prefix}${__filename}`;
-    let process = 0;
+    const found_tcp = [];
-    let timer = 0;
+    // Functions are named to aid debugging when they are not called.
-    let pipe = 0;
+    const validators = {
-    let tcp = 0;
+      fs_event: common.mustCall(function fs_event_validator(handle) {
-    let udp = 0;
+        if (!child_data.skip_fs_watch) {
-    const fs_msg = 'fs_event not found';
+          assert.strictEqual(handle.filename, expected_filename);
-    const poll_msg = 'poll_event not found';
+          assert(handle.is_referenced);
-    const process_msg = 'process event not found';
+        }
-    const timer_msg = 'timer event not found';
+      }),
-    const pipe_msg = 'pipe event not found';
+      fs_poll: common.mustCall(function fs_poll_validator(handle) {
-    const tcp_msg = 'tcp event not found';
+        assert.strictEqual(handle.filename, expected_filename);
-    const udp_msg = 'udp event not found';
+        assert(handle.is_referenced);
-    for (const entry in report.libuv) {
+      }),
-      if (report.libuv[entry].type === 'fs_event') fs = 1;
+      pipe: common.mustCallAtLeast(function pipe_validator(handle) {
-      else if (report.libuv[entry].type === 'fs_poll') poll = 1;
+        assert(handle.is_referenced);
-      else if (report.libuv[entry].type === 'process') process = 1;
+      }),
-      else if (report.libuv[entry].type === 'timer') timer = 1;
+      process: common.mustCall(function process_validator(handle) {
-      else if (report.libuv[entry].type === 'pipe') pipe = 1;
+        assert.strictEqual(handle.pid, child_data.pid);
-      else if (report.libuv[entry].type === 'tcp') tcp = 1;
+        assert(handle.is_referenced);
-      else if (report.libuv[entry].type === 'udp') udp = 1;
+      }),
+      tcp: common.mustCall(function tcp_validator(handle) {
+        // TCP handles. The report should contain three sockets:
+        // 1. The server's listening socket.
+        // 2. The inbound socket making the request.
+        // 3. The outbound socket sending the response.
+        const port = child_data.tcp_address.port;
+        if (handle.localEndpoint.port === port) {
+          if (handle.remoteEndpoint === null) {
+            found_tcp.push('listening');
+          } else {
+            found_tcp.push('inbound');
+          }
+        } else if (handle.remoteEndpoint.port === port) {
+          found_tcp.push('outbound');
+        }
+        assert(handle.is_referenced);
+      }, 3),
+      timer: common.mustCall(function timer_validator(handle) {
+        assert(!handle.is_referenced);
+        assert.strictEqual(handle.repeat, 0);
+      }),
+      udp: common.mustCall(function udp_validator(handle) {
+        assert.strictEqual(handle.localEndpoint.port,
+                           child_data.udp_address.port);
+        assert(handle.is_referenced);
+      }),
+    };
+    for (const entry of report.libuv) {
+      if (validators[entry.type]) validators[entry.type](entry);
+    }
+    for (const socket of ['listening', 'inbound', 'outbound']) {
+      assert(found_tcp.includes(socket), `${socket} TCP socket was not found`);
     }
-    assert.deepStrictEqual(fs, 1, fs_msg);
-    assert.deepStrictEqual(poll, 1, poll_msg);
-    assert.deepStrictEqual(process, 1, process_msg);
-    assert.deepStrictEqual(timer, 1, timer_msg);
-    assert.deepStrictEqual(pipe, 1, pipe_msg);
-    assert.deepStrictEqual(tcp, 1, tcp_msg);
-    assert.deepStrictEqual(udp, 1, udp_msg);
 
     // Common report tests.
     helper.validateContent(stdout);