Add SO_MEMINFO socket option for gathering socket related info

Author: devnexen

NEWS

@@ -53,6 +53,7 @@ PHP                                                                        NEWS
 
 - Sockets:
   . Added TCP_NOTSENT_LOWAT socket option. (David Carlier)
+  . Added SO_MEMINFO socket option. (David Carlier)
 
 - Sodium:
   . Added sodium_crypto_stream_xchacha20_xor_ic(). (Scott)

ext/sockets/sockets.c

@@ -55,6 +55,9 @@
 # if HAVE_IF_NAMETOINDEX
 #  include <net/if.h>
 # endif
+# ifdef SO_MEMINFO
+#  include <linux/sock_diag.h>
+# endif
 #endif
 
 #include <stddef.h>
@@ -550,6 +553,9 @@ static PHP_MINIT_FUNCTION(sockets)
 #ifdef SO_INCOMING_CPU
 	REGISTER_LONG_CONSTANT("SO_INCOMING_CPU",   SO_INCOMING_CPU,    CONST_CS | CONST_PERSISTENT);
 #endif
+#ifdef SO_MEMINFO
+	REGISTER_LONG_CONSTANT("SO_MEMINFO", SO_MEMINFO,        CONST_CS | CONST_PERSISTENT);
+#endif
 #ifdef TCP_NODELAY
 	REGISTER_LONG_CONSTANT("TCP_NODELAY",   TCP_NODELAY,    CONST_CS | CONST_PERSISTENT);
 #endif
@@ -1836,6 +1842,37 @@ PHP_FUNCTION(socket_get_option)
 				add_assoc_long(return_value, "sec", tv.tv_sec);
 				add_assoc_long(return_value, "usec", tv.tv_usec);
 				return;
+#ifdef SO_MEMINFO
+			case SO_MEMINFO: {
+				uint32_t minfo[SK_MEMINFO_VARS];
+				optlen = sizeof(minfo);
+
+				if (getsockopt(php_sock->bsd_socket, level, optname, (char*)minfo, &optlen) != 0) {
+					PHP_SOCKET_ERROR(php_sock, "Unable to retrieve socket option", errno);
+					RETURN_FALSE;
+				}
+
+				if (UNEXPECTED(optlen != sizeof(minfo))) {
+					// unlikely since the kernel fills up the whole array if getsockopt succeeded
+					// but just an extra precaution in case.
+					php_error_docref(NULL, E_WARNING, "Unable to retrieve all socket meminfo data");
+					RETURN_FALSE;
+				}
+
+				array_init(return_value);
+
+				add_assoc_long(return_value, "rmem_alloc", minfo[SK_MEMINFO_RMEM_ALLOC]);
+				add_assoc_long(return_value, "rcvbuf", minfo[SK_MEMINFO_RCVBUF]);
+				add_assoc_long(return_value, "wmem_alloc", minfo[SK_MEMINFO_WMEM_ALLOC]);
+				add_assoc_long(return_value, "sndbuf", minfo[SK_MEMINFO_SNDBUF]);
+				add_assoc_long(return_value, "fwd_alloc", minfo[SK_MEMINFO_FWD_ALLOC]);
+				add_assoc_long(return_value, "wmem_queued", minfo[SK_MEMINFO_WMEM_QUEUED]);
+				add_assoc_long(return_value, "optmem", minfo[SK_MEMINFO_OPTMEM]);
+				add_assoc_long(return_value, "backlog", minfo[SK_MEMINFO_BACKLOG]);
+				add_assoc_long(return_value, "drops", minfo[SK_MEMINFO_DROPS]);
+				return;
+			}
+#endif
 #ifdef SO_ACCEPTFILTER
 			case SO_ACCEPTFILTER: {
 

ext/sockets/tests/socket_meminfo.phpt

@@ -0,0 +1,71 @@
+--TEST--
+socket_get_option MEMINFO;
+--EXTENSIONS--
+sockets
+--SKIPIF--
+<?php
+if (!defined("SO_MEMINFO")) die('skip SO_MEMINFO test');
+?>
+--FILE--
+<?php
+$server = socket_create(AF_INET, SOCK_STREAM, SOL_TCP);
+if (!$server) {
+    die('Unable to create AF_INET socket [server]');
+}
+
+if (!socket_bind($server, '127.0.0.1', 0)) {
+    die("Unable to bind to 127.0.0.1");
+}
+
+if (!socket_listen($server, 2)) {
+    die('Unable to listen on socket');
+}
+
+socket_getsockname($server, $unused, $port);
+
+/* Connect to it */
+$client = socket_create(AF_INET, SOCK_STREAM, SOL_TCP);
+if (!$client) {
+    die('Unable to create AF_INET socket [client]');
+}
+if (!socket_connect($client, '127.0.0.1', $port)) {
+    die('Unable to connect to server socket');
+}
+
+/* Accept that connection */
+$socket = socket_accept($server);
+if (!$socket) {
+    die('Unable to accept connection');
+}
+
+socket_write($client, "SO_MEMINFO\n");
+
+socket_read($socket, strlen("SO_MEMINFO"), PHP_BINARY_READ);
+$data = socket_get_option($socket, SOL_SOCKET, SO_MEMINFO);
+var_dump($data);
+
+socket_close($client);
+socket_close($socket);
+socket_close($server);
+?>
+--EXPECTF--
+array(9) {
+  ["rmem_alloc"]=>
+  int(%d)
+  ["rcvbuf"]=>
+  int(%d)
+  ["wmem_alloc"]=>
+  int(%d)
+  ["sndbuf"]=>
+  int(%d)
+  ["fwd_alloc"]=>
+  int(%d)
+  ["wmem_queued"]=>
+  int(%d)
+  ["optmem"]=>
+  int(%d)
+  ["backlog"]=>
+  int(%d)
+  ["drops"]=>
+  int(%d)
+}