Last updated: Fri, 26 Sep 2008

stream_socket_client

(PHP 5)

stream_socket_client — Open Internet or Unix domain socket connection

Description

resource stream_socket_client ( string $remote_socket [, int &$errno [, string &$errstr [, float $timeout [, int $flags [, resource $context ]]]]] )

Initiates a stream or datagram connection to the destination specified by remote_socket . The type of socket created is determined by the transport specified using standard URL formatting: transport://target. For Internet Domain sockets (AF_INET) such as TCP and UDP, the target portion of the remote_socket parameter should consist of a hostname or IP address followed by a colon and a port number. For Unix domain sockets, the target portion should point to the socket file on the filesystem. The optional timeout can be used to set a timeout in seconds for the connect system call. flags is a bitmask field which may be set to any combination of connection flags. Currently the selection of connection flags is limited to STREAM_CLIENT_CONNECT (default), STREAM_CLIENT_ASYNC_CONNECT and STREAM_CLIENT_PERSISTENT.

Note: If you need to set a timeout for reading/writing data over the socket, use stream_set_timeout(), as the timeout parameter to stream_socket_client() only applies while connecting the socket.

Note: The timeout parameter only applies if you are not making an asynchronous connection attempt.

stream_socket_client() returns a stream resource which may be used together with the other file functions (such as fgets(), fgetss(), fwrite(), fclose(), and feof()).

If the call fails, it will return FALSE and if the optional errno and errstr arguments are present they will be set to indicate the actual system level error that occurred in the system-level connect() call. If the value returned in errno is 0 and the function returned FALSE, it is an indication that the error occurred before the connect() call. This is most likely due to a problem initializing the socket. Note that the errno and errstr arguments will always be passed by reference.

Depending on the environment, the Unix domain or the optional connect timeout may not be available. A list of available transports can be retrieved using stream_get_transports(). See List of Supported Socket Transports for a list of built in transports.

The stream will by default be opened in blocking mode. You can switch it to non-blocking mode by using stream_set_blocking().

Example #1 stream_socket_client() Example


<?php
$fp = stream_socket_client("tcp://www.example.com:80", $errno, $errstr, 30);
if (!$fp) {
    echo "$errstr ($errno)<br />\n";
} else {
    fwrite($fp, "GET / HTTP/1.0\r\nHost: www.example.com\r\nAccept: */*\r\n\r\n");
    while (!feof($fp)) {
        echo fgets($fp, 1024);
    }
    fclose($fp);
}
?>

The example below shows how to retrieve the day and time from the UDP service "daytime" (port 13) in your own machine.

Example #2 Using UDP connection


<?php
$fp = stream_socket_client("udp://127.0.0.1:13", $errno, $errstr);
if (!$fp) {
    echo "ERROR: $errno - $errstr<br />\n";
} else {
    fwrite($fp, "\n");
    echo fread($fp, 26);
    fclose($fp);
}
?>

Warning

UDP sockets will sometimes appear to have opened without an error, even if the remote host is unreachable. The error will only become apparent when you read or write data to/from the socket. The reason for this is because UDP is a "connectionless" protocol, which means that the operating system does not try to establish a link for the socket until it actually needs to send or receive data.

Note: When specifying a numerical IPv6 address (e.g. fe80::1), you must enclose the IP in square brackets—for example, tcp://[fe80::1]:80.

stream_socket_enable_crypto

stream_socket_accept

Last updated: Fri, 26 Sep 2008

add a note User Contributed Notes
stream_socket_client

robin at gareus dot org
27-Aug-2008 06:19


the httpPost() function was almost too long for a user-comment..  I've cut some newlines but to be complete the code snippet misses:



<?php

 function randomNonce($len=0) {

  $chars = "ABCDEFGHIJKMNOPQRSTUVWXYZabcdefghijkmnopqrstuvwxyz023456789";

  $i=0; $rv='';

  if ($len < 1) $len= (6+rand()%10);

  while ($i++ < $len) {

    $rv.=$chars[rand() % strlen($chars)];

  }

  return $rv;

}

?>

robin at gareus dot org
27-Aug-2008 05:34


I came here since fsockopen() does not support any SSL certificate checking in PHP5.



while curl is nice, I use stream_socket_client() to make XML-RPC POST requests via HTTPS and since I have not found any PHP code around that does this, I'll attach an example that also includes HTTP-Digest Auth (eg. trac's WikiRPCInterface2):



<?php

#################################################

# $host: hostname ; eg 'example.org' 

# $path: request' eg '/index.php?id=123'

# $data_to_send : data to POST after the HTTP header.

#

# if $opts is an  empty array() a standard  HTTP to port 80 request is performed. 

# 

# set auth['type']='basic' to use plain-text auth, 

# digest-auth will be handled automatically if $auth['username'] is set and a 401

# status is encountered. - use auth['type']='nodigest' to override.

#

##

function httpPost($host, $path, $data_to_send,

                  $opts=array('cert'=>"", 'headers'=>0, 'transport' =>'ssl', 'port'=>443),

                  $auth=array('username'=>"", 'password'=>"", 'type'=>"")

                 ) {

  $transport=''; $port=80;

  if (!empty($opts['transport'])) $transport=$opts['transport'];

  if (!empty($opts['port'])) $port=$opts['port'];

  $remote=$transport.'://'.$host.':'.$port;



  $context = stream_context_create();

  $result = stream_context_set_option($context, 'ssl', 'verify_host', true);

  if (!empty($opts['cert'])) {

    $result = stream_context_set_option($context, 'ssl', 'cafile', $opts['cert']);

    $result = stream_context_set_option($context, 'ssl', 'verify_peer', true);

  } else {

    $result = stream_context_set_option($context, 'ssl', 'allow_self_signed', true);

  }

  $fp = stream_socket_client($remote, $err, $errstr, 60, STREAM_CLIENT_CONNECT, $context);



  if (!$fp) {

    trigger_error('httpPost error: '.$errstr);

    return NULL;

  }



  $req='';

  $req.="POST $path HTTP/1.1\r\n";

  $req.="Host: $host\r\n";

  if ($auth['type']=='basic' && !empty($auth['username'])) {

    $req.="Authorization: Basic ";

    $req.=base64_encode($auth['username'].':'.$auth['password'])."\r\n";

  }

  elseif ($auth['type']=='digest' && !empty($auth['username'])) {

    $req.='Authorization: Digest ';

    foreach ($auth as $k => $v) {

      if (empty($k) || empty($v)) continue;

      if ($k=='password') continue;

      $req.=$k.'="'.$v.'", ';

    }

    $req.="\r\n";

  }

  $req.="Content-type: text/xml\r\n";

  $req.='Content-length: '. strlen($data_to_send) ."\r\n";

  $req.="Connection: close\r\n\r\n";



  fputs($fp, $req);

  fputs($fp, $data_to_send);



  while(!feof($fp)) { $res .= fgets($fp, 128); }

  fclose($fp);



  if ($auth['type']!='nodigest'

        && !empty($auth['username'])

        && $auth['type']!='digest' # prev. digest AUTH failed.

        && preg_match("/^HTTP\/[0-9\.]* 401 /", $res)) {

    if (1 == preg_match("/WWW-Authenticate: Digest ([^\n\r]*)\r\n/Us", $res, $matches)) {

      foreach (split(",", $matches[1]) as $i) {

        $ii=split("=",trim($i),2);

        if (!empty($ii[1]) && !empty($ii[0])) {

          $auth[$ii[0]]=preg_replace("/^\"/",'', preg_replace("/\"$/",'', $ii[1]));

        }

      }

      $auth['type']='digest';

      $auth['uri']='https://'.$host.$path;

      $auth['cnonce']=randomNonce();

      $auth['nc']=1;

      $a1=md5($auth['username'].':'.$auth['realm'].':'.$auth['password']);

      $a2=md5('POST'.':'.$auth['uri']);

      $auth['response']=md5($a1.':'

                           .$auth['nonce'].':'.$auth['nc'].':'

                           .$auth['cnonce'].':'.$auth['qop'].':'.$a2);

      return httpPost($host, $path, $data_to_send, $opts, $auth);

    }

  }



  if (1 != preg_match("/^HTTP\/[0-9\.]* ([0-9]{3}) ([^\r\n]*)/", $res, $matches)) {

    trigger_error('httpPost: invalid HTTP reply.');

    return NULL;

  }



  if ($matches[1] != '200') {

    trigger_error('httpPost: HTTP error: '.$matches[1].' '.$matches[2]);

    return NULL;

  }



  if (!$opts['headers']) {

    $res=preg_replace("/^.*\r\n\r\n/Us",'',$res);

  }

  return $res;

}

?>

wbeaver at afilias dot info
01-Sep-2007 04:06


# Some may find it useful to know that your caCert 

# must be in pem format, and that PHP seems to like 

# your key, cert, and cacert pem's to be concatenated

# in a single file (I suffered various "unknown chain" 

# errors, otherwise)

#

# So, (linux users), concat your components as follows:

# (where current working dir is dir where 

# cert components are stored)

#

# cat key.pem >certchain.pem

# cat cert.pem >>certchain.pem

# cat cacert.pem >>certchain.pem

#

# Then, the php....

##################################



<?php



$host = 'host.domain.tld';

$port = 1234;

$timeout = 10;



$cert = '/path/to/your/certchain/certchain.pem';

$context = stream_context_create(array('ssl'=>array('local_cert'=> $cert,

)));



if ($fp = stream_socket_client('ssl://'.$host.':'.$port, $errno, $errstr, 30,

        STREAM_CLIENT_CONNECT, $context)) {

    fwrite($fp, "\n");

    echo fread($fp,8192);

    fclose($fp);

} else {

   echo "ERROR: $errno - $errstr<br />\n";

}



?>

add a note

stream_socket_enable_crypto

stream_socket_accept

Last updated: Fri, 26 Sep 2008