(PHP 4 >= 4.1.0, PHP 5, PHP 7, PHP 8)
socket_bind — Vincula un nombre a un socket
Vincula el nombre dado en address al socket
descrito por socket. Esto tiene que ser hecho antes
de establecer una conexión usando socket_connect()
o socket_listen().
socketUn recurso socket válido creado con socket_create().
address
Si el socket es de la familia AF_INET,
address es una IP en notación decimal con puntos
(p.ej. 127.0.0.1).
Si el socket es de la familia AF_UNIX,
address es una ruta de un
socket de dominio Unix (p.ej. /tmp/my.sock).
port (Optional)
El parámetro port sólo se usa cuando
se vincula un socket AF_INET, y designa
el puerto en el que escuchar conexiones.
Devuelve true en caso de éxito o false en caso de error.
El código de error se puede recuperar con socket_last_error(). Este código puede pasarse a socket_strerror() para obtener una explicación textual del error.
Ejemplo #1 Usar socket_bind() para establecer la dirección de origen
<?php
// Crear un nuevo socket
$sock = socket_create(AF_INET, SOCK_STREAM, SOL_TCP);
// Una lista de ejemplo de direcciones IP pertenecientes al ordenador
$sourceips['kevin'] = '127.0.0.1';
$sourceips['madcoder'] = '127.0.0.2';
// Vincular la dirección de origen
socket_bind($sock, $sourceips['madcoder']);
// Conectar a la dirección de destino
socket_connect($sock, '127.0.0.1', 80);
// Escribir
$request = 'GET / HTTP/1.1' . "\r\n" .
'Host: example.com' . "\r\n\r\n";
socket_write($sock, $request);
// Cerrar
socket_close($sock);
?>Nota:
ESta función se debe usar sobre el socket antes de socket_connect().
Nota:
Observación de compatibilidad con Windows 9x/ME: socket_last_error() puede devolver un código de error no válido si intenta vincular el socket a una dirección errónea que no pertenece a su máquina.
If you want to reuse address and port, and get rid of error: unable to bind, address already in use, you have to use socket_setopt (check actual spelling for this function in you PHP verison) before calling bind:
<?php
if (!socket_set_option($sock, SOL_SOCKET, SO_REUSEADDR, 1)) {
echo socket_strerror(socket_last_error($sock));
exit;
}
?>
This solution was found by
Christophe Dirac. Thank you Christophe!Regarding previous post:
"0" has address is no different from "0.0.0.0"
127.0.0.1 -> accept only from local host
w.x.y.z (valid local IP) -> accep only from this network
0.0.0.0 -> accept from anywhereUse 0 for port to bind a random (free) port for incoming connections:
socket_bind ($socket, $bind_address, 0);
socket_getsockname($socket, $socket_address, $socket_port);
socket_listen($socket);
...
$socket_port contains the assigned port, you might want to send it to a remote client connecting. Tested with php 5.03.I am posting this as I've spent a few hours debugging this.
If you use socket_create / socket_bind with Unix domain sockets, then using socket_close at the end is not sufficient. You will get "address already in use" the second time you run your script. Call unlink on the file that is used for Unix domain sockets, preferably before you start to create the socket.
<?php
$socket_file = "./test.sock";
if (file_exists($socket_file))
unlink($socket_file);
# optional file lock
$socket = socket_create(AF_UNIX, SOCK_STREAM, 0);
# ... socket_set_option ...
socket_bind($socket, $socket_file);
# ...
socket_close($socket);
# optional : release lock
unlink($socket_file);
?>The aforementioned tidbit about using NULL to bind to all addresses did not work for me, as I would receive an error about unknown address. Using a 0 worked for me:
socket_bind ($socket, 0, $port)
This also allows you to receive UDP broadcasts, which is what I had been trying to figure out.When doing Unix sockets, it might be necessary to chmod the socket file so as to give Write permission to Group and/or Others. Otherwise, only the owner is allowed to write data into the stream.
Example:
<?php
$sockpath = '/tmp/my.sock';
socket_bind($socket, $sockpath);
//here: write-only (socket_send) to others, only owner can fetch data.
chmod($sockpath, 0702);
?>