Add test for so_reuseport stream socket option

Author: bukka

ext/standard/tests/network/so_reuseport.phpt

@@ -0,0 +1,136 @@
+--TEST--
+stream_socket_server() SO_REUSEPORT context option test
+--SKIPIF--
+<?php
+if (substr(PHP_OS, 0, 3) == "WIN") {
+    die('skip SO_REUSEPORT not available on Windows');
+}
+?>
+--FILE--
+<?php
+// SO_REUSEPORT enabled - should allow multiple servers on same port
+$context1 = stream_context_create(['socket' => ['so_reuseport' => true]]);
+$server1 = stream_socket_server("tcp://127.0.0.1:0", $errno, $errstr, 
+    STREAM_SERVER_BIND | STREAM_SERVER_LISTEN, $context1);
+
+if (!$server1) {
+    die('Unable to create server1');
+}
+
+$addr = stream_socket_get_name($server1, false);
+$port = (int)substr(strrchr($addr, ':'), 1);
+
+// Establish actual connection on server1
+$client1 = stream_socket_client("tcp://127.0.0.1:$port");
+$accepted1 = stream_socket_accept($server1, 1);
+
+// Force real TCP connection with data
+fwrite($client1, "test");
+fread($accepted1, 4);
+fwrite($accepted1, "response");
+fread($client1, 8);
+
+// Try to bind second server to SAME port with SO_REUSEPORT (while server1 still active)
+$context2 = stream_context_create(['socket' => ['so_reuseport' => true]]);
+$server2 = @stream_socket_server("tcp://127.0.0.1:$port", $errno, $errstr, 
+    STREAM_SERVER_BIND | STREAM_SERVER_LISTEN, $context2);
+
+if ($server2) {
+    echo "SO_REUSEPORT enabled: Multiple servers succeeded\n";
+    
+    // Verify server2 can also accept connections
+    $client2 = stream_socket_client("tcp://127.0.0.1:$port");
+    $accepted2_on_srv1 = @stream_socket_accept($server1, 0.1);
+    $accepted2_on_srv2 = @stream_socket_accept($server2, 0.1);
+    
+    if ($accepted2_on_srv1 || $accepted2_on_srv2) {
+        echo "SO_REUSEPORT enabled: Connections accepted\n";
+    }
+    
+    if ($accepted2_on_srv1) fclose($accepted2_on_srv1);
+    if ($accepted2_on_srv2) fclose($accepted2_on_srv2);
+    if ($client2) fclose($client2);
+    
+    fclose($server2);
+} else {
+    echo "SO_REUSEPORT enabled: Multiple servers failed\n";
+}
+
+fclose($accepted1);
+fclose($client1);
+fclose($server1);
+
+// SO_REUSEPORT disabled (default) - should NOT allow multiple servers
+$server3 = stream_socket_server("tcp://127.0.0.1:0", $errno, $errstr, 
+    STREAM_SERVER_BIND | STREAM_SERVER_LISTEN);
+
+if (!$server3) {
+    die('Unable to create server3');
+}
+
+$addr = stream_socket_get_name($server3, false);
+$port = (int)substr(strrchr($addr, ':'), 1);
+
+$client3 = stream_socket_client("tcp://127.0.0.1:$port");
+$accepted3 = stream_socket_accept($server3, 1);
+
+fwrite($client3, "test");
+fread($accepted3, 4);
+fwrite($accepted3, "response");
+fread($client3, 8);
+
+// Try to bind second server WITHOUT SO_REUSEPORT (while server3 still active)
+$server4 = @stream_socket_server("tcp://127.0.0.1:$port", $errno, $errstr, 
+    STREAM_SERVER_BIND | STREAM_SERVER_LISTEN);
+
+if ($server4) {
+    echo "SO_REUSEPORT disabled: Multiple servers succeeded\n";
+    fclose($server4);
+} else {
+    echo "SO_REUSEPORT disabled: Multiple servers failed\n";
+}
+
+fclose($accepted3);
+fclose($client3);
+fclose($server3);
+
+// SO_REUSEPORT explicitly disabled
+$context3 = stream_context_create(['socket' => ['so_reuseport' => false]]);
+$server5 = stream_socket_server("tcp://127.0.0.1:0", $errno, $errstr, 
+    STREAM_SERVER_BIND | STREAM_SERVER_LISTEN, $context3);
+
+if (!$server5) {
+    die('Unable to create server5');
+}
+
+$addr = stream_socket_get_name($server5, false);
+$port = (int)substr(strrchr($addr, ':'), 1);
+
+$client5 = stream_socket_client("tcp://127.0.0.1:$port");
+$accepted5 = stream_socket_accept($server5, 1);
+
+fwrite($client5, "test");
+fread($accepted5, 4);
+fwrite($accepted5, "response");
+fread($client5, 8);
+
+$context4 = stream_context_create(['socket' => ['so_reuseport' => false]]);
+$server6 = @stream_socket_server("tcp://127.0.0.1:$port", $errno, $errstr, 
+    STREAM_SERVER_BIND | STREAM_SERVER_LISTEN, $context4);
+
+if ($server6) {
+    echo "SO_REUSEPORT explicitly disabled: Multiple servers succeeded\n";
+    fclose($server6);
+} else {
+    echo "SO_REUSEPORT explicitly disabled: Multiple servers failed\n";
+}
+
+fclose($accepted5);
+fclose($client5);
+fclose($server5);
+?>
+--EXPECT--
+SO_REUSEPORT enabled: Multiple servers succeeded
+SO_REUSEPORT enabled: Connections accepted
+SO_REUSEPORT disabled: Multiple servers failed
+SO_REUSEPORT explicitly disabled: Multiple servers failed