socket_connect

Description

bool socket_connect ( resource socket, string address [, int port] )

Initiates a connection using the socket resource socket, which must be a valid socket resource created with socket_create().

The address parameter is either an IP address in dotted-quad notation (e.g. 127.0.0.1), if the socket is of the AF_INET family; or the pathname of a Unix domain socket, if the socket family is AF_UNIX.

The port parameter is only used when connecting to an AF_INET socket, and designates the port on the remote host to which a connection should be made.

如果成功则返回 TRUE，失败则返回 FALSE。 The error code can be retrieved with socket_last_error(). This code may be passed to socket_strerror() to get a textual explanation of the error.

add a note User Contributed Notes

ScriptBlue at nyc dot rr dot com
18-Sep-2005 12:13


If you do want to have a socket_connect operation timeout you can use the following code.

<?php

$sock = socket_create(AF_INET, SOCK_STREAM, SOL_TCP);

socket_set_nonblock($sock);

socket_connect($sock,"127.0.0.1", 80);

socket_set_block($sock);

switch(socket_select($r = array($sock), $w = array($sock), $f = array($sock), 5))

{

        case 2:

                echo "[-] Connection Refused\n";

                break;

        case 1:

                echo "[+] Connected\n";

                break;

        case 0:

                echo "[-] Timeout\n";

                break;

}

?>

This basically makes socket_connect return immediately then you can use socket_select to see how the socket reacted.

11-Jul-2005 10:26


well this solution (above) is not right because you cant ping port...

telefoontoestel at home
23-Nov-2003 04:05


In reply to the function socket_raw_connect posted by "net_del at freemail dot ru". In the function you give a return value and afterwords you try to close the connection. That won't ever work. I think you want to alter your code ;-)

seymour@itsyourdomain
02-Oct-2003 03:43


here's how you can implement timeouts with the socket functions. 



this example works for blocking sockets but will work for both blocking and nonblocking with minor modifications. first call to connect in nonblocking mode returns 115 EINPROGRESS, additional calls return 114 EALREADY if the connection has not already failed or succeeded. once the connection succeeds, the socket resource will be returned.



<?

    $host = "127.0.0.1";

    $port = "80";

    $timeout = 15;  //timeout in seconds



    $socket = socket_create(AF_INET, SOCK_STREAM, SOL_TCP)

      or die("Unable to create socket\n");



    socket_set_nonblock($socket)

      or die("Unable to set nonblock on socket\n");



    $time = time();

    while (!@socket_connect($socket, $host, $port))

    {

      $err = socket_last_error($socket);

      if ($err == 115 || $err == 114)

      {

        if ((time() - $time) >= $timeout)

        {

          socket_close($socket);

          die("Connection timed out.\n");

        }

        sleep(1);

        continue;

      }

      die(socket_strerror($err) . "\n");

    }



    socket_set_block($this->socket)

      or die("Unable to set block on socket\n");

?>

net_del at freemail dot ru
27-Aug-2003 04:54


function socket_raw_connect ($server, $port, $timeout,$request)


{


 if (!is_numeric($port) or !is_numeric($timeout)) {return false;}


 $socket = fsockopen($server, $port, $errno, $errstr, $timeout);


 fputs($socket, $request); 


 $ret = '';


 while (!feof($socket))


 { 


  $ret .= fgets($socket, 4096);


 }


 return $ret;


 fclose($socket);


}





this code for easy raw connect.





Comment by net_del[nkg] (www.nkg.ru)


I am from russia. PHP is good language!

w at ff dot st
28-Jun-2003 05:20


man page for connect :

 EINPROGRESS

The socket is non-blocking and the connection cannot be completed immediately.  It is possible to select(2) or poll(2) for completion by selecting the socket for writing. After select indicates  writability,  use  getsockopt(2)  to read the SO_ERROR option at level SOL_SOCKET to determine whether connect completed successfully (SO_ERROR is zero) or unsuccessfully (SO_ERROR is one of the usual error codes listed here, explaining the reason for the failure).



use socket_getoption($socket,SOL_SOCKET,SO_ERROR) . If you get value 115, it is connecting. If you get value different than 115 and 0, that means that an error has occured (see what error with socket_strerror()).



However, I don't know how does that works under Windows, maybe it wont work at all. It is supposed to work under Linux (man pages said that).

greg at mtechsolutions dot ca
01-May-2003 05:12


If you're using non-blocking, be sure not to turn it on until after you connect, otherwise you will get the mesasge:



PHP Warning:  socket_connect() unable to connect [115]: Operation now in progress in file.php on line 123



and socket_connect() will return false (even though it will connect).

logan at voerthegame dot com
25-Jul-2002 02:24


I had the same problem with the timeout, and i applied this solution.



It works only on linux PHP, i make a ping to the ip before connect the socket.....



$address = gethostbyname ($ip);

        $command = "ping -c 1 " . $address;  

        $r = exec($command);  

          if ($r[0]=="r")

          {        

            $socket = socket_create (AF_INET, SOCK_STREAM, 0);

            if ($socket < 0) {

                echo "socket_create() failed: reason: " . socket_strerror ($socket) . "\n";

            } else {

                echo "OK.\n";

            }

add a note