Be wary of using stream_socket_shutdown with a TLS socket. The socket is closed without sending the "close_notify" message required by TLS protocol.
To correctly close a TLS socket, use fclose() instead, which internally calls OpenSSL's SSL_shutdown() function.
stream_socket_shutdown
(PHP 5 >= 5.2.1, PHP 7, PHP 8)
stream_socket_shutdown — Cerrar una conexión full-duplex
Descripción
Cierra (parcialmente o no) una conexión full-duplex.
Nota:
El búfer o búferes podrían o no estar vaciados.
Parámetros
-
stream -
Un flujo abierto (con stream_socket_client(), por ejemplo)
-
how -
Una de las siguientes constantes:
STREAM_SHUT_RD(deshabilita recepciones),STREAM_SHUT_WR(deshabilita transmisiones) oSTREAM_SHUT_RDWR(deshabilita recepciones y transmisiones).
Valores devueltos
Devuelve true en caso de éxito o false en caso de error.
Ejemplos
Ejemplo #1 Un ejemplo de stream_socket_shutdown()
<?php
$servidor = stream_socket_server('tcp://127.0.0.1:1337');
$cliente = stream_socket_client('tcp://127.0.0.1:1337');
var_dump(fputs($cliente, "hola"));
stream_socket_shutdown($cliente, STREAM_SHUT_WR);
var_dump(fputs($cliente, "hola")); // no funciona ahora
?>El resultado del ejemplo sería algo similar a:
int(5) Notice: fputs(): send of 5 bytes failed with errno=32 Broken pipe in test.php on line 9 int(0)
add a note
User Contributed Notes 3 notes
Daniel J ¶
3 years ago
jgotti ¶
12 years ago
Just a note to say that if you encounter problem closing some sockets using fclose in a multi client server, you should really give this one a try.
Spent a full day trying to resolve this issue using stream_socket_shutdown($clientStream,STREAM_SHUT_RDWR);
finally do the trick.
Anonymous ¶
3 years ago
As Daniel J has pointed out, stream_socket_shutdown doesn't send the TLS close_notify message. In some instances, it's a preferred function over fclose (to trigger stream_select, for example).
To use this function correctly with TLS, use stream_socket_enable_crypto($fp, false); before shutting down the socket.
