net: rework autoSelectFamily implementation

PR-URL: #46587
Backport-PR-URL: #49183
Reviewed-By: Matteo Collina <matteo.collina@gmail.com>
Reviewed-By: James M Snell <jasnell@gmail.com>

Author: ShogunPanda

doc/api/net.md

@@ -935,7 +935,7 @@ For TCP connections, available `options` are:
 * `autoSelectFamilyAttemptTimeout` {number}: The amount of time in milliseconds to wait
   for a connection attempt to finish before trying the next address when using the `autoSelectFamily` option.
   If set to a positive integer less than `10`, then the value `10` will be used instead.
-  **Default:** `250`.
+  **Default:** initially `250`, but it can be changed at runtime using [`net.setDefaultAutoSelectFamilyAttemptTimeout(value)`][]
 
 For [IPC][] connections, available `options` are:
 
@@ -1520,26 +1520,6 @@ immediately initiates connection with
 [`socket.connect(port[, host][, connectListener])`][`socket.connect(port)`],
 then returns the `net.Socket` that starts the connection.
 
-## `net.setDefaultAutoSelectFamily(value)`
-
-<!-- YAML
-added: REPLACEME
--->
-
-Sets the default value of the `autoSelectFamily` option of [`socket.connect(options)`][].
-
-* `value` {boolean} The new default value. The initial default value is `false`.
-
-## `net.getDefaultAutoSelectFamily()`
-
-<!-- YAML
-added: REPLACEME
--->
-
-Gets the current default value of the `autoSelectFamily` option of [`socket.connect(options)`][].
-
-* Returns: {boolean} The current default value of the `autoSelectFamily` option.
-
 ## `net.createServer([options][, connectionListener])`
 
 <!-- YAML
@@ -1640,6 +1620,47 @@ Use `nc` to connect to a Unix domain socket server:
 $ nc -U /tmp/echo.sock
 ```
 
+## `net.getDefaultAutoSelectFamily()`
+
+<!-- YAML
+added: v19.4.0
+-->
+
+Gets the current default value of the `autoSelectFamily` option of [`socket.connect(options)`][].
+
+* Returns: {boolean} The current default value of the `autoSelectFamily` option.
+
+## `net.setDefaultAutoSelectFamily(value)`
+
+<!-- YAML
+added: v19.4.0
+-->
+
+Sets the default value of the `autoSelectFamily` option of [`socket.connect(options)`][].
+
+* `value` {boolean} The new default value. The initial default value is `false`.
+
+## `net.getDefaultAutoSelectFamilyAttemptTimeout()`
+
+<!-- YAML
+added: REPLACEME
+-->
+
+Gets the current default value of the `autoSelectFamilyAttemptTimeout` option of [`socket.connect(options)`][].
+
+* Returns: {number} The current default value of the `autoSelectFamilyAttemptTimeout` option.
+
+## `net.setDefaultAutoSelectFamilyAttemptTimeout(value)`
+
+<!-- YAML
+added: REPLACEME
+-->
+
+Sets the default value of the `autoSelectFamilyAttemptTimeout` option of [`socket.connect(options)`][].
+
+* `value` {number} The new default value, which must be a positive number. If the number is less than `10`,
+  the value `10` is used insted The initial default value is `250`.
+
 ## `net.isIP(input)`
 
 <!-- YAML
@@ -1725,6 +1746,7 @@ net.isIPv6('fhqwhgads'); // returns false
 [`net.createConnection(port, host)`]: #netcreateconnectionport-host-connectlistener
 [`net.createServer()`]: #netcreateserveroptions-connectionlistener
 [`net.setDefaultAutoSelectFamily(value)`]: #netsetdefaultautoselectfamilyvalue
+[`net.setDefaultAutoSelectFamilyAttemptTimeout(value)`]: #netsetdefaultautoselectfamilyattempttimeoutvalue
 [`new net.Socket(options)`]: #new-netsocketoptions
 [`readable.setEncoding()`]: stream.md#readablesetencodingencoding
 [`server.close()`]: #serverclosecallback

lib/_tls_wrap.js

@@ -54,7 +54,7 @@ const EE = require('events');
 const net = require('net');
 const tls = require('tls');
 const common = require('_tls_common');
-const { kWrapConnectedHandle } = require('internal/net');
+const { kReinitializeHandle } = require('internal/net');
 const JSStreamSocket = require('internal/js_stream_socket');
 const { Buffer } = require('buffer');
 let debug = require('internal/util/debuglog').debuglog('tls', (fn) => {
@@ -633,14 +633,27 @@ TLSSocket.prototype._wrapHandle = function(wrap, handle) {
   return res;
 };
 
-TLSSocket.prototype[kWrapConnectedHandle] = function(handle) {
-  this._handle = this._wrapHandle(null, handle);
+TLSSocket.prototype[kReinitializeHandle] = function reinitializeHandle(handle) {
+  const originalServername = this._handle.getServername();
+  const originalSession = this._handle.getSession();
+
+  this.handle = this._wrapHandle(null, handle);
   this.ssl = this._handle;
+
+  net.Socket.prototype[kReinitializeHandle].call(this, this.handle);
   this._init();
 
   if (this._tlsOptions.enableTrace) {
     this._handle.enableTrace();
   }
+
+  if (originalSession) {
+    this.setSession(originalSession);
+  }
+
+  if (originalServername) {
+    this.setServername(originalServername);
+  }
 };
 
 // This eliminates a cyclic reference to TLSWrap
@@ -679,6 +692,30 @@ TLSSocket.prototype._destroySSL = function _destroySSL() {
   this[kIsVerified] = false;
 };
 
+function keylogNewListener(event) {
+  if (event !== 'keylog')
+    return;
+
+  // Guard against enableKeylogCallback after destroy
+  if (!this._handle) return;
+  this._handle.enableKeylogCallback();
+
+  // Remove this listener since it's no longer needed.
+  this.removeListener('newListener', keylogNewListener);
+}
+
+function newListener(event) {
+  if (event !== 'session')
+    return;
+
+  // Guard against enableSessionCallbacks after destroy
+  if (!this._handle) return;
+  this._handle.enableSessionCallbacks();
+
+  // Remove this listener since it's no longer needed.
+  this.removeListener('newListener', newListener);
+}
+
 // Constructor guts, arbitrarily factored out.
 let warnOnTlsKeylog = true;
 let warnOnTlsKeylogError = true;
@@ -704,18 +741,9 @@ TLSSocket.prototype._init = function(socket, wrap) {
 
   // Only call .onkeylog if there is a keylog listener.
   ssl.onkeylog = onkeylog;
-  this.on('newListener', keylogNewListener);
 
-  function keylogNewListener(event) {
-    if (event !== 'keylog')
-      return;
-
-    // Guard against enableKeylogCallback after destroy
-    if (!this._handle) return;
-    this._handle.enableKeylogCallback();
-
-    // Remove this listener since it's no longer needed.
-    this.removeListener('newListener', keylogNewListener);
+  if (this.listenerCount('newListener', keylogNewListener) === 0) {
+    this.on('newListener', keylogNewListener);
   }
 
   if (options.isServer) {
@@ -750,18 +778,8 @@ TLSSocket.prototype._init = function(socket, wrap) {
     ssl.onnewsession = onnewsessionclient;
 
     // Only call .onnewsession if there is a session listener.
-    this.on('newListener', newListener);
-
-    function newListener(event) {
-      if (event !== 'session')
-        return;
-
-      // Guard against enableSessionCallbacks after destroy
-      if (!this._handle) return;
-      this._handle.enableSessionCallbacks();
-
-      // Remove this listener since it's no longer needed.
-      this.removeListener('newListener', newListener);
+    if (this.listenerCount('newListener', newListener) === 0) {
+      this.on('newListener', newListener);
     }
   }
 

lib/internal/net.js

@@ -67,7 +67,7 @@ function makeSyncWrite(fd) {
 }
 
 module.exports = {
-  kWrapConnectedHandle: Symbol('wrapConnectedHandle'),
+  kReinitializeHandle: Symbol('reinitializeHandle'),
   isIP,
   isIPv4,
   isIPv6,

lib/net.js

@@ -43,7 +43,7 @@ let debug = require('internal/util/debuglog').debuglog('net', (fn) => {
   debug = fn;
 });
 const {
-  kWrapConnectedHandle,
+  kReinitializeHandle,
   isIP,
   isIPv4,
   isIPv6,
@@ -55,6 +55,7 @@ const {
   UV_EADDRINUSE,
   UV_EINVAL,
   UV_ENOTCONN,
+  UV_ECANCELED,
 } = internalBinding('uv');
 
 const { Buffer } = require('buffer');
@@ -132,6 +133,7 @@ let dns;
 let BlockList;
 let SocketAddress;
 let autoSelectFamilyDefault = getOptionValue('--enable-network-family-autoselection');
+let autoSelectFamilyAttemptTimeoutDefault = 250;
 
 const { clearTimeout, setTimeout } = require('timers');
 const { kTimeout } = require('internal/timers');
@@ -254,6 +256,20 @@ function setDefaultAutoSelectFamily(value) {
   autoSelectFamilyDefault = value;
 }
 
+function getDefaultAutoSelectFamilyAttemptTimeout() {
+  return autoSelectFamilyAttemptTimeoutDefault;
+}
+
+function setDefaultAutoSelectFamilyAttemptTimeout(value) {
+  validateInt32(value, 'value', 1);
+
+  if (value < 1) {
+    value = 10;
+  }
+
+  autoSelectFamilyAttemptTimeoutDefault = value;
+}
+
 // Returns an array [options, cb], where options is an object,
 // cb is either a function or null.
 // Used to normalize arguments of Socket.prototype.connect() and
@@ -694,7 +710,11 @@ function tryReadStart(socket) {
 
 // Just call handle.readStart until we have enough in the buffer
 Socket.prototype._read = function(n) {
-  debug('_read');
+  debug(
+    '_read - n', n,
+    'isConnecting?', !!this.connecting,
+    'hasHandle?', !!this._handle,
+  );
 
   if (this.connecting || !this._handle) {
     debug('_read wait for connection');
@@ -1034,7 +1054,7 @@ function internalConnect(
       localAddress = localAddress || DEFAULT_IPV6_ADDR;
       err = self._handle.bind6(localAddress, localPort, flags);
     }
-    debug('binding to localAddress: %s and localPort: %d (addressType: %d)',
+    debug('connect: binding to localAddress: %s and localPort: %d (addressType: %d)',
           localAddress, localPort, addressType);
 
     err = checkBindError(err, localPort, self._handle);
@@ -1045,6 +1065,8 @@ function internalConnect(
     }
   }
 
+  debug('connect: attempting to connect to %s:%d (addressType: %d)', address, port, addressType);
+
   if (addressType === 6 || addressType === 4) {
     const req = new TCPConnectWrap();
     req.oncomplete = afterConnect;
@@ -1081,17 +1103,17 @@ function internalConnect(
 }
 
 
-function internalConnectMultiple(context) {
+function internalConnectMultiple(context, canceled) {
   clearTimeout(context[kTimeout]);
   const self = context.socket;
-  assert(self.connecting);
 
   // All connections have been tried without success, destroy with error
-  if (context.current === context.addresses.length) {
+  if (canceled || context.current === context.addresses.length) {
     self.destroy(aggregateErrors(context.errors));
     return;
   }
 
+  assert(self.connecting);
 
   const current = context.current++;
   const handle = current === 0 ? self._handle : new TCP(TCPConstants.SOCKET);
@@ -1120,6 +1142,8 @@ function internalConnectMultiple(context) {
     }
   }
 
+  debug('connect/multiple: attempting to connect to %s:%d (addressType: %d)', address, port, addressType);
+
   const req = new TCPConnectWrap();
   req.oncomplete = FunctionPrototypeBind(afterConnectMultiple, undefined, context, current);
   req.address = address;
@@ -1213,6 +1237,15 @@ Socket.prototype.connect = function(...args) {
   return this;
 };
 
+Socket.prototype[kReinitializeHandle] = function reinitializeHandle(handle) {
+  this._handle?.close();
+
+  this._handle = handle;
+  this._handle[owner_symbol] = this;
+
+  initSocketHandle(this);
+};
+
 function socketToDnsFamily(family) {
   switch (family) {
     case 'IPv4':
@@ -1260,7 +1293,7 @@ function lookupAndConnect(self, options) {
       autoSelectFamilyAttemptTimeout = 10;
     }
   } else {
-    autoSelectFamilyAttemptTimeout = 250;
+    autoSelectFamilyAttemptTimeout = autoSelectFamilyAttemptTimeoutDefault;
   }
 
   // If host is an IP, skip performing a lookup
@@ -1302,17 +1335,19 @@ function lookupAndConnect(self, options) {
     debug('connect: autodetecting');
 
     dnsopts.all = true;
-    lookupAndConnectMultiple(
-      self,
-      async_id_symbol,
-      lookup,
-      host,
-      options,
-      dnsopts,
-      port,
-      localPort,
-      autoSelectFamilyAttemptTimeout,
-    );
+    defaultTriggerAsyncIdScope(self[async_id_symbol], function() {
+      lookupAndConnectMultiple(
+        self,
+        async_id_symbol,
+        lookup,
+        host,
+        options,
+        dnsopts,
+        port,
+        localPort,
+        autoSelectFamilyAttemptTimeout,
+      );
+    });
 
     return;
   }
@@ -1360,6 +1395,8 @@ function lookupAndConnectMultiple(self, async_id_symbol, lookup, host, options,
       if (!self.connecting) {
         return;
       } else if (err) {
+        self.emit('lookup', err, undefined, undefined, host);
+
         // net.createConnection() creates a net.Socket object and immediately
         // calls net.Socket.connect() on it (that's us). There are no event
         // listeners registered yet so defer the error event to the next tick.
@@ -1559,7 +1596,7 @@ function afterConnectMultiple(context, current, status, handle, req, readable, w
     ArrayPrototypePush(context.errors, ex);
 
     // Try the next address
-    internalConnectMultiple(context);
+    internalConnectMultiple(context, status === UV_ECANCELED);
     return;
   }
 
@@ -1570,13 +1607,9 @@ function afterConnectMultiple(context, current, status, handle, req, readable, w
     return;
   }
 
-  // Perform initialization sequence on the handle, then move on with the regular callback
-  self._handle = handle;
-  initSocketHandle(self);
-
-  if (self[kWrapConnectedHandle]) {
-    self[kWrapConnectedHandle](handle);
-    initSocketHandle(self); // This is called again to initialize the TLSWrap
+  if (context.current > 1 && self[kReinitializeHandle]) {
+    self[kReinitializeHandle](handle);
+    handle = self._handle;
   }
 
   if (hasObserver('net')) {
@@ -2295,4 +2328,6 @@ module.exports = {
   Stream: Socket, // Legacy naming
   getDefaultAutoSelectFamily,
   setDefaultAutoSelectFamily,
+  getDefaultAutoSelectFamilyAttemptTimeout,
+  setDefaultAutoSelectFamilyAttemptTimeout,
 };

test/parallel/test-http-autoselectfamily.js

@@ -7,14 +7,12 @@ const assert = require('assert');
 const dgram = require('dgram');
 const { Resolver } = require('dns');
 const { request, createServer } = require('http');
+const { setDefaultAutoSelectFamilyAttemptTimeout } = require('net');
 
 // Test that happy eyeballs algorithm is properly implemented when using HTTP.
 
-let autoSelectFamilyAttemptTimeout = common.platformTimeout(250);
-if (common.isWindows) {
-  // Some of the windows machines in the CI need more time to establish connection
-  autoSelectFamilyAttemptTimeout = common.platformTimeout(1500);
-}
+// Some of the windows machines in the CI need more time to establish connection
+setDefaultAutoSelectFamilyAttemptTimeout(common.platformTimeout(common.isWindows ? 1500 : 250));
 
 function _lookup(resolver, hostname, options, cb) {
   resolver.resolve(hostname, 'ANY', (err, replies) => {
@@ -77,7 +75,6 @@ function createDnsServer(ipv6Addr, ipv4Addr, cb) {
         {
           lookup,
           autoSelectFamily: true,
-          autoSelectFamilyAttemptTimeout
         },
         (res) => {
           assert.strictEqual(res.statusCode, 200);
@@ -122,7 +119,6 @@ if (common.hasIPv6) {
           {
             lookup,
             autoSelectFamily: true,
-            autoSelectFamilyAttemptTimeout,
           },
           (res) => {
             assert.strictEqual(res.statusCode, 200);

test/parallel/test-http2-ping-settings-heapdump.js

@@ -11,6 +11,14 @@ const v8 = require('v8');
 // after it is destroyed, either because they are detached from it or have been
 // destroyed themselves.
 
+// We use an higher autoSelectFamilyAttemptTimeout in this test as the v8.getHeapSnapshot().resume()
+// will slow the connection flow and we don't want the second connection attempt to start.
+let autoSelectFamilyAttemptTimeout = common.platformTimeout(1000);
+if (common.isWindows) {
+  // Some of the windows machines in the CI need more time to establish connection
+  autoSelectFamilyAttemptTimeout = common.platformTimeout(10000);
+}
+
 for (const variant of ['ping', 'settings']) {
   const server = http2.createServer();
   server.on('session', common.mustCall((session) => {
@@ -30,7 +38,7 @@ for (const variant of ['ping', 'settings']) {
   }));
 
   server.listen(0, common.mustCall(() => {
-    const client = http2.connect(`http://localhost:${server.address().port}`,
+    const client = http2.connect(`http://localhost:${server.address().port}`, { autoSelectFamilyAttemptTimeout },
                                  common.mustCall());
     client.on('error', (err) => {
       // We destroy the session so it's possible to get ECONNRESET here.

test/parallel/test-https-autoselectfamily.js

@@ -13,6 +13,7 @@ const assert = require('assert');
 const dgram = require('dgram');
 const { Resolver } = require('dns');
 const { request, createServer } = require('https');
+const { setDefaultAutoSelectFamilyAttemptTimeout } = require('net');
 
 if (!common.hasCrypto)
   common.skip('missing crypto');
@@ -24,11 +25,8 @@ const options = {
 
 // Test that happy eyeballs algorithm is properly implemented when using HTTP.
 
-let autoSelectFamilyAttemptTimeout = common.platformTimeout(250);
-if (common.isWindows) {
-  // Some of the windows machines in the CI need more time to establish connection
-  autoSelectFamilyAttemptTimeout = common.platformTimeout(1500);
-}
+// Some of the windows machines in the CI need more time to establish connection
+setDefaultAutoSelectFamilyAttemptTimeout(common.platformTimeout(common.isWindows ? 1500 : 250));
 
 function _lookup(resolver, hostname, options, cb) {
   resolver.resolve(hostname, 'ANY', (err, replies) => {
@@ -93,8 +91,6 @@ function createDnsServer(ipv6Addr, ipv4Addr, cb) {
           lookup,
           rejectUnauthorized: false,
           autoSelectFamily: true,
-          autoSelectFamilyAttemptTimeout,
-          servername: 'example.org',
         },
         (res) => {
           assert.strictEqual(res.statusCode, 200);
@@ -142,8 +138,6 @@ if (common.hasIPv6) {
             lookup,
             rejectUnauthorized: false,
             autoSelectFamily: true,
-            autoSelectFamilyAttemptTimeout,
-            servername: 'example.org',
           },
           (res) => {
             assert.strictEqual(res.statusCode, 200);

test/parallel/test-net-autoselectfamily-commandline-option.js

@@ -8,15 +8,12 @@ const { parseDNSPacket, writeDNSPacket } = require('../common/dns');
 const assert = require('assert');
 const dgram = require('dgram');
 const { Resolver } = require('dns');
-const { createConnection, createServer } = require('net');
+const { createConnection, createServer, setDefaultAutoSelectFamilyAttemptTimeout } = require('net');
 
 // Test that happy eyeballs algorithm can be enable from command line.
 
-let autoSelectFamilyAttemptTimeout = common.platformTimeout(250);
-if (common.isWindows) {
-  // Some of the windows machines in the CI need more time to establish connection
-  autoSelectFamilyAttemptTimeout = common.platformTimeout(1500);
-}
+// Some of the windows machines in the CI need more time to establish connection
+setDefaultAutoSelectFamilyAttemptTimeout(common.platformTimeout(common.isWindows ? 1500 : 250));
 
 function _lookup(resolver, hostname, options, cb) {
   resolver.resolve(hostname, 'ANY', (err, replies) => {
@@ -82,7 +79,6 @@ function createDnsServer(ipv6Addr, ipv4Addr, cb) {
         host: 'example.org',
         port: port,
         lookup,
-        autoSelectFamilyAttemptTimeout,
       });
 
       let response = '';

test/parallel/test-net-autoselectfamily-ipv4first.js

@@ -6,15 +6,12 @@ const { parseDNSPacket, writeDNSPacket } = require('../common/dns');
 const assert = require('assert');
 const dgram = require('dgram');
 const { Resolver } = require('dns');
-const { createConnection, createServer } = require('net');
+const { createConnection, createServer, setDefaultAutoSelectFamilyAttemptTimeout } = require('net');
 
 // Test that happy eyeballs algorithm is properly implemented when a A record is returned first.
 
-let autoSelectFamilyAttemptTimeout = common.platformTimeout(250);
-if (common.isWindows) {
-  // Some of the windows machines in the CI need more time to establish connection
-  autoSelectFamilyAttemptTimeout = common.platformTimeout(1500);
-}
+// Some of the windows machines in the CI need more time to establish connection
+setDefaultAutoSelectFamilyAttemptTimeout(common.platformTimeout(common.isWindows ? 1500 : 250));
 
 function _lookup(resolver, hostname, options, cb) {
   resolver.resolve(hostname, 'ANY', (err, replies) => {
@@ -88,7 +85,6 @@ if (common.hasIPv6) {
           port,
           lookup,
           autoSelectFamily: true,
-          autoSelectFamilyAttemptTimeout
         });
 
         let response = '';

test/parallel/test-net-autoselectfamily.js

@@ -10,11 +10,11 @@ const { createConnection, createServer } = require('net');
 
 // Test that happy eyeballs algorithm is properly implemented.
 
-let autoSelectFamilyAttemptTimeout = common.platformTimeout(250);
-if (common.isWindows) {
-  // Some of the windows machines in the CI need more time to establish connection
-  autoSelectFamilyAttemptTimeout = common.platformTimeout(1500);
-}
+// Purposely not using setDefaultAutoSelectFamilyAttemptTimeout here to test the
+// parameter is correctly used in options.
+//
+// Some of the windows machines in the CI need more time to establish connection
+const autoSelectFamilyAttemptTimeout = common.platformTimeout(common.isWindows ? 1500 : 250);
 
 function _lookup(resolver, hostname, options, cb) {
   resolver.resolve(hostname, 'ANY', (err, replies) => {

test/parallel/test-net-dns-custom-lookup.js

@@ -26,13 +26,22 @@ function check(addressType, cb) {
 
   function lookup(host, dnsopts, cb) {
     dnsopts.family = addressType;
+
     if (addressType === 4) {
       process.nextTick(function() {
-        cb(null, common.localhostIPv4, 4);
+        if (dnsopts.all) {
+          cb(null, [{ address: common.localhostIPv4, family: 4 }]);
+        } else {
+          cb(null, common.localhostIPv4, 4);
+        }
       });
     } else {
       process.nextTick(function() {
-        cb(null, '::1', 6);
+        if (dnsopts.all) {
+          cb(null, [{ address: '::1', family: 6 }]);
+        } else {
+          cb(null, '::1', 6);
+        }
       });
     }
   }
@@ -48,7 +57,11 @@ check(4, function() {
     host: 'localhost',
     port: 80,
     lookup(host, dnsopts, cb) {
-      cb(null, undefined, 4);
+      if (dnsopts.all) {
+        cb(null, [{ address: undefined, family: 4 }]);
+      } else {
+        cb(null, undefined, 4);
+      }
     }
   }).on('error', common.expectsError({ code: 'ERR_INVALID_IP_ADDRESS' }));
 }

test/parallel/test-net-dns-lookup.js

@@ -31,10 +31,10 @@ const server = net.createServer(function(client) {
 
 server.listen(0, common.mustCall(function() {
   net.connect(this.address().port, 'localhost')
-    .on('lookup', common.mustCall(function(err, ip, type, host) {
+    .on('lookup', common.mustCallAtLeast(function(err, ip, type, host) {
       assert.strictEqual(err, null);
       assert.match(ip, /^(127\.0\.0\.1|::1)$/);
       assert.match(type.toString(), /^(4|6)$/);
       assert.strictEqual(host, 'localhost');
-    }));
+    }, 1));
 }));

test/parallel/test-net-options-lookup.js

@@ -36,7 +36,11 @@ function connectDoesNotThrow(input) {
 {
   // Verify that an error is emitted when an invalid address family is returned.
   const s = connectDoesNotThrow((host, options, cb) => {
-    cb(null, '127.0.0.1', 100);
+    if (options.all) {
+      cb(null, [{ address: '127.0.0.1', family: 100 }]);
+    } else {
+      cb(null, '127.0.0.1', 100);
+    }
   });
 
   s.on('error', common.expectsError({

test/parallel/test-net-server-reset.js

@@ -20,17 +20,11 @@ server.on('close', common.mustCall());
 
 assert.strictEqual(server, server.listen(0, () => {
   net.createConnection(server.address().port)
-    .on('error', common.mustCall(
-      common.expectsError({
-        code: 'ECONNRESET',
-        name: 'Error'
-      }))
-    );
+    .on('error', common.mustCall((error) => {
+      assert.strictEqual(error.code, 'ECONNRESET');
+    }));
   net.createConnection(server.address().port)
-    .on('error', common.mustCall(
-      common.expectsError({
-        code: 'ECONNRESET',
-        name: 'Error'
-      }))
-    );
+    .on('error', common.mustCall((error) => {
+      assert.strictEqual(error.code, 'ECONNRESET');
+    }));
 }));

test/parallel/test-net-socket-connect-invalid-autoselectfamilyattempttimeout.js

@@ -1,5 +1,7 @@
 'use strict';
+
 require('../common');
+
 const assert = require('assert');
 const net = require('net');
 
@@ -11,4 +13,8 @@ for (const autoSelectFamilyAttemptTimeout of [-10, 0]) {
       autoSelectFamilyAttemptTimeout,
     });
   }, { code: 'ERR_OUT_OF_RANGE' });
+
+  assert.throws(() => {
+    net.setDefaultAutoSelectFamilyAttemptTimeout(autoSelectFamilyAttemptTimeout);
+  }, { code: 'ERR_OUT_OF_RANGE' });
 }

test/parallel/test-tls-autoselectfamily-servername.js

@@ -0,0 +1,37 @@
+'use strict';
+
+const common = require('../common');
+
+if (!common.hasCrypto) {
+  common.skip('missing crypto');
+}
+
+const { setDefaultAutoSelectFamilyAttemptTimeout } = require('net');
+const { connect } = require('tls');
+
+// Some of the windows machines in the CI need more time to establish connection
+setDefaultAutoSelectFamilyAttemptTimeout(common.platformTimeout(common.isWindows ? 1500 : 250));
+
+// Test that TLS connecting works without autoSelectFamily
+{
+  const socket = connect({
+    host: 'google.com',
+    port: 443,
+    servername: 'google.com',
+    autoSelectFamily: false,
+  });
+
+  socket.on('secureConnect', common.mustCall(() => socket.end()));
+}
+
+// Test that TLS connecting works with autoSelectFamily
+{
+  const socket = connect({
+    host: 'google.com',
+    port: 443,
+    servername: 'google.com',
+    autoSelectFamily: true,
+  });
+
+  socket.on('secureConnect', common.mustCall(() => socket.end()));
+}