ftp_pasv

(PHP 4, PHP 5, PHP 7, PHP 8)

ftp_pasvActiva o desactiva el modo pasivo

Descripción

ftp_pasv(resource $ftp_stream, bool $pasv): bool

ftp_pasv() activa o desactiva el modo pasivo. En modo pasivo, las conexiones de datos son iniciadas por el cliente, en lugar de por el servidor. Puede ser necesaria si el cliente está detrás de un firewall.

Tenga en cuenta que ftp_pasv() sólo puede ser llamado después de un inicio de sesión correcto o de lo contrario fallará.

Parámetros

ftp_stream

El identificador de enlace de la conexión FTP.

pasv

Si true, el modo pasivo está activado, de lo contrario estará desactivado.

Valores devueltos

Devuelve true en caso de éxito o false en caso de error.

Ejemplos

Ejemplo #1 Ejemplo de ftp_pasv()

<?php
$file
= 'somefile.txt';
$remote_file = 'readme.txt';

// establecer una conexión básica
$conn_id = ftp_connect($ftp_server);

// iniciar sesión con nombre de usuario y contraseña
$login_result = ftp_login($conn_id, $ftp_user_name, $ftp_user_pass);

// activar modo pasivo
ftp_pasv($conn_id, true);

// cargar un archivo
if (ftp_put($conn_id, $remote_file, $file, FTP_ASCII)) {
echo
"se ha cargado $file con éxito\n";
} else {
echo
"Hubo un problema al cargar $file\n";
}

// cerrar la conexión ftp
ftp_close($conn_id);
?>

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User Contributed Notes 8 notes

up
33
carda at two-wings dot net
9 years ago
It should be noted that ftp_pasv has to be called AFTER ftp_login (not after ftp_connect). May seem obvious to many but it took me three hours to find out...
up
2
rrehbein at officesupply dot com
5 years ago
For some FTP servers, it seems the sequence of passive and other commands matters more than for other FTP servers. Sorry, I don't know what vendor or version specifically.

<?php
ftp_pasv
($handle, true);
echo
"System type: ".ftp_systype($handle).PHP_EOL;
ftp_fput($handle, 'example.txt', $stream, FTP_BINARY);
?>

> PHP Warning: ftp_fput(): STOR out of sequence.

<?php
echo "System type: ".ftp_systype($handle).PHP_EOL;
ftp_pasv($handle, true);
ftp_fput($handle, 'example.txt', $stream, FTP_BINARY);
?>

> no issue
up
0
sameg14 at gmail dot com
9 years ago
If you are running filezilla in passive mode, on windows, and try to connect using PHP, you might encounter an error that reads "425 Can't open data connection for transfer of ..."
This error is not indicative of a passive mode issue, but can be resolved by using
<?php
ftp_pasv
($conn, true);
?>
up
0
marc at gutt dot it
11 years ago
If you are still having problems after choosing ftp_pasv() you should refresh the connection through ftp_close() / ftp_connect() after x files and/or y GB have been transfered.

It solved several (random) occurring problems like:

ftp_get(): Opening BINARY mode data connection

ftp_get(): Entering Passive Mode

Hint: fopen() created a file so don't forget to delete it if an error occurred ;)
up
-2
Anonymous
14 years ago
If you find that you are receiving "Illegal PORT command" errors you may want to try enabling passive mode.
up
-1
ybourbeau at edison dot ca
21 years ago
Directly from bsd FTP manual pages:

The PASV command requests that the remote server open a port for the data connection and return the address of that port.  The remote server listens on that port and the client connects to it.

                 When using the more traditional PORT command, the client listens on a port and sends that address to the remote server, who connects back to it.  Passive mode is useful when using ftp through a gateway router or host that controls the directionality of traffic.  (Note that though ftp servers are required to support the PASV command by RFC 1123, some do not.)
up
-3
mac at codegreene dot com
13 years ago
I found one place that required passive mode to function properly, but the initial error manifested itself in an odd way:

PHP Warning:  ftp_put(): TYPE is now ASCII in <file.php> on line <#>

or

PHP Warning:  ftp_put(): TYPE is now 8 BIT BINARY in <file.php> on line <#>

The other symptom is that it was taking a long time, perhaps the 90 seconds that the timeout was set to. No errors occurred upon connect, just when I tried ftp_put().

Once I turned on ftp_pasv() it worked, both in the place where active mode worked, and on the server where active mode wouldn't work.
up
-2
Anonymous
21 years ago
PASV: For ftp users behind firewall, the server LISTEN for a connection.

Non-PASV: The client LISTEN for a connection from server.
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