test: dynamic port in dgram tests

Removed common.PORT from test-dgram-close-in-listening,
test-dgram-close-is-not-callback, test-dgram-close,
test-dgram-exclusive-implicit-bind and test-dgram-oob-buffer
in order to eliminate the possibility of port collision.

Refs: https://github.com/nodejs/node/issues/12376
PR-URL: https://github.com/nodejs/node/pull/12623
Reviewed-By: Anna Henningsen <anna@addaleax.net>

test/parallel/test-dgram-close-in-listening.js

@@ -13,6 +13,14 @@ socket.on('listening', function() {
   socket.close();
 });
 
-// adds a listener to 'listening' to send the data when
-// the socket is available
-socket.send(buf, 0, buf.length, common.PORT, 'localhost');
+// get a random port for send
+const portGetter = dgram.createSocket('udp4')
+  .bind(0, 'localhost', common.mustCall(() => {
+    // adds a listener to 'listening' to send the data when
+    // the socket is available
+    socket.send(buf, 0, buf.length,
+                portGetter.address().port,
+                portGetter.address().address);
+
+    portGetter.close();
+  }));

test/parallel/test-dgram-close-is-not-callback.js

@@ -6,9 +6,16 @@ const buf = Buffer.alloc(1024, 42);
 
 const socket = dgram.createSocket('udp4');
 
-socket.send(buf, 0, buf.length, common.PORT, 'localhost');
+// get a random port for send
+const portGetter = dgram.createSocket('udp4')
+  .bind(0, 'localhost', common.mustCall(() => {
+    socket.send(buf, 0, buf.length,
+                portGetter.address().port,
+                portGetter.address().address);
 
-// if close callback is not function, ignore the argument.
-socket.close('bad argument');
+    // if close callback is not function, ignore the argument.
+    socket.close('bad argument');
+    portGetter.close();
 
-socket.on('close', common.mustCall());
+    socket.on('close', common.mustCall());
+  }));

test/parallel/test-dgram-close.js

@@ -32,14 +32,23 @@ const buf = Buffer.alloc(1024, 42);
 let socket = dgram.createSocket('udp4');
 const handle = socket._handle;
 
-socket.send(buf, 0, buf.length, common.PORT, 'localhost');
-assert.strictEqual(socket.close(common.mustCall()), socket);
-socket.on('close', common.mustCall());
-socket = null;
-
-// Verify that accessing handle after closure doesn't throw
-setImmediate(function() {
-  setImmediate(function() {
-    console.log('Handle fd is: ', handle.fd);
-  });
-});
+// get a random port for send
+const portGetter = dgram.createSocket('udp4')
+  .bind(0, 'localhost', common.mustCall(() => {
+    socket.send(buf, 0, buf.length,
+                portGetter.address().port,
+                portGetter.address().address);
+
+    assert.strictEqual(socket.close(common.mustCall()), socket);
+    socket.on('close', common.mustCall());
+    socket = null;
+
+    // Verify that accessing handle after closure doesn't throw
+    setImmediate(function() {
+      setImmediate(function() {
+        console.log('Handle fd is: ', handle.fd);
+      });
+    });
+
+    portGetter.close();
+  }));

test/parallel/test-dgram-exclusive-implicit-bind.js

@@ -70,15 +70,15 @@ if (cluster.isMaster) {
   });
 
   target.on('listening', function() {
-    cluster.fork();
-    cluster.fork();
+    cluster.fork({PORT: target.address().port});
+    cluster.fork({PORT: target.address().port});
     if (!common.isWindows) {
-      cluster.fork({BOUND: 'y'});
-      cluster.fork({BOUND: 'y'});
+      cluster.fork({BOUND: 'y', PORT: target.address().port});
+      cluster.fork({BOUND: 'y', PORT: target.address().port});
     }
   });
 
-  target.bind({port: common.PORT, exclusive: true});
+  target.bind({port: 0, exclusive: true});
 
   return;
 }
@@ -98,7 +98,8 @@ if (process.env.BOUND === 'y') {
   source.unref();
 }
 
+assert(process.env.PORT);
 const buf = Buffer.from(process.pid.toString());
 const interval = setInterval(() => {
-  source.send(buf, common.PORT, '127.0.0.1');
+  source.send(buf, process.env.PORT, '127.0.0.1');
 }, 1).unref();

test/parallel/test-dgram-oob-buffer.js

@@ -29,12 +29,17 @@ const dgram = require('dgram');
 
 const socket = dgram.createSocket('udp4');
 const buf = Buffer.from([1, 2, 3, 4]);
+const portGetter = dgram.createSocket('udp4')
+  .bind(0, 'localhost', common.mustCall(() => {
+    const address = portGetter.address();
+    portGetter.close(common.mustCall(() => {
+      socket.send(buf, 0, 0, address.port, address.address, common.noop);
+      socket.send(buf, 0, 4, address.port, address.address, common.noop);
+      socket.send(buf, 1, 3, address.port, address.address, common.noop);
+      socket.send(buf, 3, 1, address.port, address.address, common.noop);
+      // Since length of zero means nothing, don't error despite OOB.
+      socket.send(buf, 4, 0, address.port, address.address, common.noop);
 
-socket.send(buf, 0, 0, common.PORT, '127.0.0.1', common.noop); // useful? no
-socket.send(buf, 0, 4, common.PORT, '127.0.0.1', common.noop);
-socket.send(buf, 1, 3, common.PORT, '127.0.0.1', common.noop);
-socket.send(buf, 3, 1, common.PORT, '127.0.0.1', common.noop);
-// Since length of zero means nothing, don't error despite OOB.
-socket.send(buf, 4, 0, common.PORT, '127.0.0.1', common.noop);
-
-socket.close();
+      socket.close();
+    }));
+  }));