stream_socket_server

(PHP 5, PHP 7, PHP 8)

stream_socket_server — Crear un socket de servidor de dominio de Internet o de Unix

Descripción

stream_socket_server(
    string $local_socket,
    int &$errno = ?,
    string &$errstr = ?,
    int $flags = STREAM_SERVER_BIND | STREAM_SERVER_LISTEN,
    resource $context = ?
): resource

Crea un socket de flujo o de datagrama en local_socket.

Esta función sólo crea un socket, para empezar a aceptar conexiones use stream_socket_accept().

Parámetros

local_socket

El tipo de socket creado se determina por el transporte especificado usando el formato de URL estándar: transporte://objetivo.

Para sockets de Dominio de Internet (AF_INET) como TCP y UDP, la porción del objetivo del parámetro remote_socket debería consistir en un nombre de host o dirección IP seguida de dos puntos y un número de puerto. Para sockets de dominio de Unix, la porción del objetivo apuntará al archivo de socket del sistema de archivos.

Dependiendo del entorno, los sockets de dominio Unix pueden no estar disponibles. Una lista de transportes disponibles se puede recuperar unsado stream_get_transports(). Véase Lista de Transportes de Sockets Soportados para una lista de transportes incluidos.

errno

Si los argumentos opcionales errno y errstr están presentes, serán establecidos para indicar el error a nivel de sistema ocurrido en las llamadas a nivel de sistema de socket(), bind(), y listen(). Si el valor devuelto en errno es 0 y la función devuelve false, es una indicación de que el error ocurrió antes de la llamada a bind(). Esto es lo más probable debido a un problema de inicialización del socket. Observe que los argumentos errno y errstr siempre serán pasados por referencia.

errstr

Véase la descripción de errno.

flags

Campo de máscara de bits que puede ser establecido a cualquier combinación de banderas de conexión.

Nota:
Para sockets UDP, se debe usar STREAM_SERVER_BIND como parámetro flags.

context

Valores devueltos

Devuelve un flujo creado, o false si se produjo un error.

Ejemplos

Ejemplo #1 Usar sockets de servidor de TCP

<?php
$socket = stream_socket_server("tcp://0.0.0.0:8000", $errno, $errstr);
if (!$socket) {
  echo "$errstr ($errno)<br />\n";
} else {
  while ($conn = stream_socket_accept($socket)) {
    fwrite($conn, 'La fecha y hora actuales es ' . date('n/j/Y g:i a') . "\n");
    fclose($conn);
  }
  fclose($socket);
}
?>

El ejemplo de abajo muestra cómo actuar como un servidor de hora que responde a peticiones de hora como se muestra en un ejemplo de stream_socket_client().

Nota: La mayoría de los sistemas requieren acceso root para crear un socket de servidor sobre un puerto inferor a 1024.

Ejemplo #2 Usar sockets de servidor de UDP

<?php
$socket = stream_socket_server("udp://127.0.0.1:1113", $errno, $errstr, STREAM_SERVER_BIND);
if (!$socket) {
    die("$errstr ($errno)");
}

do {
    $pkt = stream_socket_recvfrom($socket, 1, 0, $peer);
    echo "$peer\n";
    stream_socket_sendto($socket, date("D M j H:i:s Y\r\n"), 0, $peer);
} while ($pkt !== false);

?>

Notas

Nota: Cuando se especifique una dirección numérica IPv6 (por ej., fe80::1), la IP debe ser encerrada entre corchetes — por ejemplo, tcp://[fe80::1]:80.

Ver también

stream_socket_client() - Abrir una conexión de socket de dominio de Internet o Unix
stream_set_blocking() - Establecer el modo bloqueo/no-bloqueo en un flujo
stream_set_timeout() - Establecer un perido de tiempo de espera en un flujo
fgets() - Obtiene una línea desde el puntero a un fichero
fgetss() - Obtiene un línea desde un puntero a un archivo y elimina las etiquetas HTML
fwrite() - Binary-safe file write
fclose() - Cierra un puntero a un archivo abierto
feof() - Comprueba si el puntero a un archivo está al final del archivo
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User Contributed Notes 6 notes

down

Heretic86 at roadrunner dot com ¶

3 years ago

This is an example of how to set up stream_socket_server to connect with multiple Secure Websockets on WSS (wss://) that uses SSL / TLS as a Transport.  

This runs on a Windows Apache Server with a registered domain and SSL Cert from LetsEncrypt via Certbot.

Run this script from a console "php server.php", and javascript html as a client with:
socket = new WebSocket('wss://php.net:1234');

<?php
$host = '192.168.1.2';
$port = 1234;
$path = 'C:/Certbot/live/php.net/';
$transport = 'tlsv1.3';
$ssl = ['ssl' => [
          'local_cert'  => $path . 'cert.pem',       // SSL Certificate
          'local_pk'    => $path . 'privkey.pem',    // SSL Keyfile
          'disable_compression' => true,             // TLS compression attack vulnerability
          'verify_peer'         => false,            // Set this to true if acting as an SSL client
          'ssltransport' => $transport,              // Transport Methods such as 'tlsv1.1', tlsv1.2' 
        ] ];
$ssl_context = stream_context_create($ssl);
$server = stream_socket_server($transport . '://' . $host . ':' . $port, $errno, $errstr, STREAM_SERVER_BIND|STREAM_SERVER_LISTEN, $ssl_context);
if (!$server) {  die("$errstr ($errno)"); } 
$clients = array($server);
$write  = NULL;
$except = NULL;
while (true) {
  $changed = $clients;
  stream_select($changed, $write, $except, 10);
  if (in_array($server, $changed)) {
    $client = @stream_socket_accept($server);
    if (!$client){ continue; }
    $clients[] = $client;
    $ip = stream_socket_get_name( $client, true );
    echo "New Client connected from $ip\n";
    
    stream_set_blocking($client, true);
    $headers = fread($client, 1500);
    handshake($client, $headers, $host, $port);
    stream_set_blocking($client, false);

    send_message($clients, mask($ip . ' connected'));
    $found_socket = array_search($server, $changed);
    unset($changed[$found_socket]);     
  }
  foreach ($changed as $changed_socket) {
    $ip = stream_socket_get_name( $changed_socket, true );
    $buffer = stream_get_contents($changed_socket);
        if ($buffer == false) {
      echo "Client Disconnected from $ip\n";
      @fclose($changed_socket);
            $found_socket = array_search($changed_socket, $clients);
            unset($clients[$found_socket]);
        }
    $unmasked = unmask($buffer);
    if ($unmasked != "") { echo "\nReceived a Message from $ip:\n\"$unmasked\" \n"; }
    $response = mask($unmasked);
    send_message($clients, $response);
  }
}
fclose($server);

function unmask($text) {
    $length = @ord($text[1]) & 127;
    if($length == 126) {    $masks = substr($text, 4, 4);    $data = substr($text, 8); }
    elseif($length == 127) {    $masks = substr($text, 10, 4); $data = substr($text, 14); }
    else { $masks = substr($text, 2, 4); $data = substr($text, 6); }
    $text = "";
    for ($i = 0; $i < strlen($data); ++$i) { $text .= $data[$i] ^ $masks[$i % 4];    }
    return $text;
}
function mask($text) {
    $b1 = 0x80 | (0x1 & 0x0f);
    $length = strlen($text);
    if($length <= 125)
        $header = pack('CC', $b1, $length);
    elseif($length > 125 && $length < 65536)
        $header = pack('CCn', $b1, 126, $length);
    elseif($length >= 65536)
        $header = pack('CCNN', $b1, 127, $length);
    return $header.$text;
}
function handshake($client, $rcvd, $host, $port){
    $headers = array();
    $lines = preg_split("/\r\n/", $rcvd);
    foreach($lines as $line)
    {
        $line = rtrim($line);
        if(preg_match('/\A(\S+): (.*)\z/', $line, $matches)){
            $headers[$matches[1]] = $matches[2];
        }
    }
    $secKey = $headers['Sec-WebSocket-Key'];
    $secAccept = base64_encode(pack('H*', sha1($secKey . '258EAFA5-E914-47DA-95CA-C5AB0DC85B11')));
    //hand shaking header
    $upgrade  = "HTTP/1.1 101 Web Socket Protocol Handshake\r\n" .
    "Upgrade: websocket\r\n" .
    "Connection: Upgrade\r\n" .
    "WebSocket-Origin: $host\r\n" .
    "WebSocket-Location: wss://$host:$port\r\n".
    "Sec-WebSocket-Version: 13\r\n" .
    "Sec-WebSocket-Accept:$secAccept\r\n\r\n";
  fwrite($client, $upgrade);
}
function send_message($clients, $msg){
    foreach($clients as $changed_socket){
    @fwrite($changed_socket, $msg);
    }
}
?>

down

blackmac01 at gmail dot com ¶

8 years ago

I'm writing an HTTP server and I need SSL support, but getting this to work correctly with PHP streams took a bit of trial and error. For anyone who is trying to get an HTTP SSL server working with stream_socket_server:

1) Your SSL context will need to contain 'local_cert'. If  you did not include your private key with your local_cert, you'll also need to specify 'local_pk' which is your RSA key.  Your keys and certs should be PEM encoded, which means base-64. If your certificate has intermediary certs, you will need to specify those in the correct order: Your signed cert, intermediary cert 1, intermediary cert 2, etc. Each cert in the list needs to validate the one above it, but you do not need to include the CA Root that your SSL signer provided; that should already be included with the client's software (i.e. trust root certs).

You can append your private key in the file with your certs, however I keep mine in its own file. If you see the word "encrypted" when you view your key with a text viewer, you need to enter the correct passphrase and specify the context "passphrase", otherwise you can leave that one out.

As a server, verify_peer is irrelevant and should be set to false (should always be true if you are acting as an SSL client). Both cafile and capath contexts are not needed for functioning as a SSL/TLS server, but they are needed if you are making SSL connections with PHP as the client.

Lastly, the 'ciphers' context should be set to a list of secure ciphers. Search for "mozilla recommended ciphers" and choose the string of ciphers that works for you, because not all openssl supported ciphers are secure. I went with the "intermediate" list, which provides high security and compatibility.

2) When you create the binding for stream_socket_server(), make sure that you choose the tcp:// wrapper. DO NOT USE ssl:// or tls://. Anything other than tcp:// will not work correctly AS A SERVER, those transports are what you use when making connections with PHP as a client. 

Remember that the encryption does not start until after an SSL handshake completes, so the server has to listen in non-encrypted mode for new connections, and encryption doesn't start until certs are exchanged and a cipher is selected. When a new connection arrives you accept it with stream_socket_accept() and then use stream_socket_enable_crypto() to start the SSL session.

3) Keep in mind that the SSL handshake takes time, and that the stream_socket wrappers are high level and not as responsive as the socket extension due to the additional overhead they incur. For this reason you will need to enable blocking for accepting new connections.

<enable blocking on ServerListenStream>
newConnStream = stream_socket_accept(ServerListenStream);
<disable blocking on ServerListenStream>

<enable blocking on newConnStream >
stream_socket_enable_crypto(newConnStream, true, STREAM_CRYPTO_METHOD_SSLv23_SERVER);
<disable blocking on newConnStream >

Note that this is mainly for HTTP. If you are trying to do something like SMTP then your script will have to react to the "starttls" command, but it would be similar to the above except that you would wait for the "starttls" command before invoking the  stream_socket_enable_crypto() function on the client's stream.

TLS 1.0 is generally the way to go, SSLv3 is insecure and SSLv2 is buggy. If you use the mozilla recommend cipher list in your context, you'll be fine. Hope this helps someone out!

down

davidm at marketo dot com ¶

14 years ago

In some specialized scenarios, you may want to create an AF_INET socket (UDP or TCP) but let the system select an unused port for you.  This is a standard feature of internet sockets but it doesn't seem to be documented how to do this for the stream_socket_server function.  It appears you can get this behavior by selecting zero for the port number, for example, my test below printed "127.0.0.1:4960".



<?php

  $sock = stream_socket_server("udp://127.0.0.1:0"); 

  $name = stream_socket_get_name($sock);

  echo $name;

?>

down

frxstrem ¶

14 years ago

Using the OpenSSL extension, PHP can automatically generate self-signed SSL certificates, which can be used for basic authentication and encryption (although I would recommend to use a signed certificate instead) for SSL servers.

I have extended the script by 'e at osterman dot com' to automatically create self-signed certificates:

<?php
// Hello World! SSL HTTP Server.
// Tested on PHP 5.1.2-1+b1 (cli) (built: Mar 20 2006 04:17:24)

// Certificate data:
$dn = array(
    "countryName" => "UK",
    "stateOrProvinceName" => "Somerset",
    "localityName" => "Glastonbury",
    "organizationName" => "The Brain Room Limited",
    "organizationalUnitName" => "PHP Documentation Team",
    "commonName" => "Wez Furlong",
    "emailAddress" => "wez@example.com"
);

// Generate certificate
$privkey = openssl_pkey_new();
$cert    = openssl_csr_new($dn, $privkey);
$cert    = openssl_csr_sign($cert, null, $privkey, 365);

// Generate PEM file
# Optionally change the passphrase from 'comet' to whatever you want, or leave it empty for no passphrase
$pem_passphrase = 'comet';
$pem = array();
openssl_x509_export($cert, $pem[0]);
openssl_pkey_export($privkey, $pem[1], $pem_passphrase);
$pem = implode($pem);

// Save PEM file
$pemfile = './server.pem';
file_put_contents($pemfile, $pem);

$context = stream_context_create();

// local_cert must be in PEM format
stream_context_set_option($context, 'ssl', 'local_cert', $pemfile);
// Pass Phrase (password) of private key
stream_context_set_option($context, 'ssl', 'passphrase', $pem_passphrase);

stream_context_set_option($context, 'ssl', 'allow_self_signed', true);
stream_context_set_option($context, 'ssl', 'verify_peer', false);

// Create the server socket
$server = stream_socket_server('ssl://0.0.0.0:9001', $errno, $errstr, STREAM_SERVER_BIND|STREAM_SERVER_LISTEN, $context);

while(true)
{
    $buffer = '';
    print "waiting...";
    $client = stream_socket_accept($server);
    print "accepted " . stream_socket_get_name( $client, true) . "\n";
    if( $client )
    {
        // Read until double CRLF
        while( !preg_match('/\r?\n\r?\n/', $buffer) )
            $buffer .= fread($client, 2046); 
        // Respond to client
        fwrite($client,  "200 OK HTTP/1.1\r\n"
                         . "Connection: close\r\n"
                         . "Content-Type: text/html\r\n"
                         . "\r\n"
                         . "Hello World! " . microtime(true)
                         . "<pre>{$buffer}</pre>");
        fclose($client);
    } else {
        print "error.\n";
    }
}

?>

down

andrey at php dot net ¶

20 years ago

Just a small example how to use this function and also stream_select() to make a server that accepts more than one connections (can have many clients connected):
In master we hold all opened connections. Just before calling stream select we copy the array to $read and then pass it ot stream_select(). In case that we may read from at least one socket, $read will contain socket descriptors. $master is needed not to lose references to the opened connections we have.
stream_server.php : 
<?php

$master = array();
$socket = stream_socket_server("tcp://0.0.0.0:8000", $errno, $errstr);
if (!$socket) {
    echo "$errstr ($errno)<br />\n";
} else {
    $master[] = $socket;
    $read = $master;
    while (1) {
        $read = $master;
        $mod_fd = stream_select($read, $_w = NULL, $_e = NULL, 5);
        if ($mod_fd === FALSE) {
            break;
        }
        for ($i = 0; $i < $mod_fd; ++$i) {
            if ($read[$i] === $socket) {
                $conn = stream_socket_accept($socket);
                fwrite($conn, "Hello! The time is ".date("n/j/Y g:i a")."\n");
                $master[] = $conn;
            } else {
                $sock_data = fread($read[$i], 1024);
                var_dump($sock_data);
                if (strlen($sock_data) === 0) { // connection closed
                    $key_to_del = array_search($read[$i], $master, TRUE);
                    fclose($read[$i]);
                    unset($master[$key_to_del]);
                } else if ($sock_data === FALSE) {
                    echo "Something bad happened";
                    $key_to_del = array_search($read[$i], $master, TRUE);
                    unset($master[$key_to_del]);
                } else {
                    echo "The client has sent :"; var_dump($sock_data);
                    fwrite($read[$i], "You have sent :[".$sock_data."]\n");
                    fclose($read[$i]);
                     unset($master[array_search($read[$i], $master)]);
                }
            }
        }
    }
}
?>
stream_client.php:
<?php
$fp = stream_socket_client("tcp://127.0.0.1:8000", $errno, $errstr, 30);
if (!$fp) {
    echo "$errstr ($errno)<br />\n";
} else {
    fwrite($fp, "Aloha");
    while (!feof($fp)) {
        var_dump(fgets($fp, 1024));
    }
    fclose($fp);
}
?>

Thanks

down

peterjb at me dot com ¶

14 years ago

I had a horrible time trying to shove a TLS socket into an existing TCP program.  It appears to me that functions like stream_socket_recvfrom and stream_socket_sendto don't work with TLS/SSL (which may be obvious to PHP gurus...sorry if it is, I'm in a bit over my head here).

In the end I ended up doing all my IO with fread() and fwrite(), which solved all my problems.

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