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 anywhere
(PHP 4 >= 4.1.0, PHP 5, PHP 7, PHP 8)
socket_bind — Vincula un nombre a un socket
$socket
, string $address
, int $port
= 0): bool
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().
socket
Un 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.
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 anywhere
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!
Use 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);
...
$socket_port contains the assigned port, you might want to send it to a remote client connecting. Tested with php 5.03.
The aforementioned tidbit about using NULL to bind to all addresses did not work for me, as I would receive an error about unknown address. Using a 0 worked for me:
socket_bind ($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);
?>
It appears for the $address parameter:
'127.0.0.1'
accepts clients from localhost (eg. 127.0.0.1)
'0.0.0.0'
accepts clients from localhost, and the server's network (eg. 127.0.0.1, 192.168.2.5, 10.20.30.40)
'0' or 0
accepts clients from localhost, the server's network, and external networks (eg. 127.0.0.1, 192.168.2.5, 10.20.30.40, 209.85.169.99)