ext/sockets: adding IPPROTO_ICMP* constants for socket creations.

Is to create socket for Internet Control Message Protocol context.
Due to their nature, they are meant to be used via
raw sockets rather than TCP/UDP.

close GH-16737

NEWS

@@ -45,6 +45,10 @@ PHP                                                                        NEWS
   . Fixed bug #49169 (SoapServer calls wrong function, although "SOAP action"
     header is correct). (nielsdos)
 
+- Sockets:
+  . Added IPPROTO_ICMP/IPPROTO_ICMPV6 to create raw socket for ICMP usage.
+    (David Carlier)
+
 - Standard:
   . Fixed crypt() tests on musl when using --with-external-libcrypt
     (Michael Orlitzky).

UPGRADING

@@ -129,6 +129,9 @@ PHP 8.5 UPGRADE NOTES
 - POSIX:
   . POSIX_SC_OPEN_MAX.
 
+- Sockets:
+  . IPPROTO_ICMP/IPPROTO_ICMPV6.
+
 ========================================
 11. Changes to INI File Handling
 ========================================

ext/sockets/sockets.stub.php

@@ -1647,6 +1647,20 @@
  */
 const SOL_UDPLITE = UNKNOWN;
 #endif
+#if defined(IPPROTO_ICMP) || defined(PHP_WIN32)
+/**
+ * @var int
+ * @cvalue IPPROTO_ICMP
+ */
+const IPPROTO_ICMP = UNKNOWN;
+#endif
+#if defined(IPPROTO_ICMPV6) || defined(PHP_WIN32)
+/**
+ * @var int
+ * @cvalue IPPROTO_ICMPV6
+ */
+const IPPROTO_ICMPV6 = UNKNOWN;
+#endif
 
 #ifdef HAVE_IPV6
 /**

ext/sockets/tests/socket_icmp.phpt

@@ -0,0 +1,57 @@
+--TEST--
+socket_create with IPPROTO_ICMP
+--EXTENSIONS--
+sockets
+--SKIPIF--
+<?php
+if (!defined("IPPROTO_ICMP")) die("skip IPPROTO_ICMP not available");
+// IPPROTO_ICMP* functions with raw sockets, thus requiring administrative role.
+if (PHP_OS_FAMILY !== "Windows" && (!function_exists("posix_getuid") || posix_getuid() != 0)) die('skip IPPROTO_ICMP requires root permissions.');
+?>
+--FILE--
+<?php
+
+$host = '127.0.0.1';
+
+$type = 8;
+$code = 0;
+$identifier = 16;
+$sequence = 1;
+$data = "ECHO";
+
+$socket = socket_create(AF_INET, SOCK_RAW, IPPROTO_ICMP);
+if (!$socket) {
+    die("Unable to create socket: " . socket_strerror(socket_last_error()) . "\n");
+}
+
+$header = pack('C2n3a*', $type, $code, 0, $identifier, $sequence, $data);
+$checksum = function($header): int {
+    $bit = unpack('n*', $header);
+    $sum = array_sum($bit);
+
+    while ($sum >> 16) {
+        $sum = ($sum & 0xFFFF) + ($sum >> 16);
+    }
+    return ~ $sum & 0xFFFF;
+};
+$header = pack('C2n3a*', $type, $code, $checksum($header), $identifier, $sequence, $data);
+
+if (!socket_sendto($socket, $header, strlen($header), 0, $host, 0)) {
+    die("Unable to send packet: " . socket_strerror(socket_last_error($socket)) . "\n");
+}
+
+$read = [$socket];
+$write = $except = [];
+$timeout = ['sec' => 4, 'usec' => 0];
+if (socket_select($read, $write, $except, $timeout['sec'], $timeout['usec']) > 0) {
+    $response = '';
+    socket_recv($socket, $response, 65535, 0);
+    var_dump(bin2hex($response));
+} else {
+    die("Unable to read the response\n");
+}
+
+socket_close($socket);
+?>
+--EXPECTF--
+string(64) "%s"