socket_close
This will give you a simple port-checker.
Note that on production-machines, you might want to alter the error reporting-level,
since unsuccessful connects will give you a "No connection could be made because
the target machine actively refused it"-error in the log.
Under Windows, make sure you enable the php_sockets.dll extension in your php.ini.
<?php
$address=$_SERVER['REMOTE_ADDR'];
if (isset($_REQUEST['port']) and
(!strlen($_REQUEST['port'])==0))
$port=$_REQUEST['port'];
else
unset($port);
if (isset($port) and
($socket=socket_create(AF_INET, SOCK_STREAM, SOL_TCP)) and
(socket_connect($socket, $address, $port)))
{
$text="Connection successful on IP $address, port $port";
socket_close($socket);
}
else
$text="Unable to connect<pre>".socket_strerror(socket_last_error())."</pre>";
echo "<html><head></head><body>".
$text.
"</body></html>";
?>
Greetz,
Peter.
socket_connect
(PHP 4 >= 4.1.0, PHP 5)
socket_connect — Inicializa uma conexão em um socket
Descrição
bool socket_connect
( resource $socket
, string $address
[, int $port
] )
Aviso
Esta função é EXPERIMENTAL. O comportamento desta função, seu nome, incluindo toda documentação pode ser modificado sem aviso em futuras versões do PHP. Esta função deve ser usada por sua própria conta e risco.
Inicializa uma conexão usando o socket resource socket , que deve ser um válido socket resource criado com socket_create().
O parâmetro address é qualquer endereço IP na notação "dotted-quad" (ex. 127.0.0.1), se o socket é da família AF_INET; ou o pathname de um Unix-domain socket, se o socket é da família AF_UNIX.
O parâmetro port é somente usado quando estiver conectando com um socket AF_INET, e determina a porta no host remoto para o qual a conexão deve ser feita.
Retorna TRUE em caso de sucesso ou FALSE em falhas. O código de erro pode ser retornado com socket_last_error(). Esse código deve ser passado para socket_strerror() para pegar uma explicação textual do erro.
Veja também socket_bind(), socket_listen(), socket_create(), socket_last_error() e socket_strerror().
add a note
User Contributed Notessocket_connect
peter at videoripper dot org
29-Oct-2009 05:29
29-Oct-2009 05:29
jerrywilborn at gmail dot com
02-Sep-2009 02:40
02-Sep-2009 02:40
This will print the banner from a true 'telnet' server (router, switch, host, etc).
$socket = socket_create(AF_INET, SOCK_STREAM, SOL_TCP);
socket_connect($socket, '127.0.0.1', 23);
while (TRUE) {
$r = array($socket);
$c = socket_select($r, $w = NULL, $e = NULL, 5);
foreach ($r as $read_socket) {
if ($r = negotiate($read_socket)) {
var_dump($r);
exit;
}
}
}
function negotiate ($socket) {
socket_recv($socket, $buffer, 1024, 0);
for ($chr = 0; $chr < strlen($buffer); $chr++) {
if ($buffer[$chr] == chr(255)) {
$send = (isset($send) ? $send . $buffer[$chr] : $buffer[$chr]);
$chr++;
if (in_array($buffer[$chr], array(chr(251), chr(252)))) $send .= chr(254);
if (in_array($buffer[$chr], array(chr(253), chr(254)))) $send .= chr(252);
$chr++;
$send .= $buffer[$chr];
} else {
break;
}
}
if (isset($send)) socket_send($socket, $send, strlen($send), 0);
if ($chr - 1 < strlen($buffer)) return substr($buffer, $chr);
}
vshih at yahoo
14-Apr-2009 05:52
14-Apr-2009 05:52
rbarnes' tip is helpful, but I found that I needed to add a check for SOCKET_EISCONN in the while loop:
...
$error = socket_last_error();
if ($error == SOCKET_EISCONN) {
$connected = true;
break;
}
...
At least on Mac OS X 10.5.
maganap
18-Sep-2008 05:15
18-Sep-2008 05:15
Hi there!
For the TCP connections: socket_create(AF_INET, SOCK_STREAM, SOL_TCP);
In case you're having problems in socket_connect() with socket_strerror() = "Permission denied", you may be having a SELinux config issue.
Check if SELinux is enabled:
# /usr/sbin/sestatus -v
In case it is, you can just type the command:
# setsebool httpd_can_network_connect=1
That's it... I read you had to reboot, but I didn't and it worked fine anyway. More info, you may check:
http://arkiv.netbsd.se/?ml=squirrelmail-users&a=2005-11&t=1523021
rbarnes at fake dot com
15-Jul-2008 03:04
15-Jul-2008 03:04
Here is an example of a non-blocking connect which should perform quite a bit faster than the one posted by Seymour below:
<?php
function msConnectSocket($remote, $port, $timeout = 30) {
# this works whether $remote is a hostname or IP
$ip = "";
if( !preg_match('/^\d+\.\d+\.\d+\.\d+$/', $remote) ) {
$ip = gethostbyname($remote);
if ($ip == $remote) {
$this->errstr = "Error Connecting Socket: Unknown host";
return NULL;
}
} else $ip = $remote;
if (!($this->_SOCK = @socket_create(AF_INET, SOCK_STREAM, SOL_TCP))) {
$this->errstr = "Error Creating Socket: ".socket_strerror(socket_last_error());
return NULL;
}
socket_set_nonblock($this->_SOCK);
$error = NULL;
$attempts = 0;
$timeout *= 1000; // adjust because we sleeping in 1 millisecond increments
$connected;
while (!($connected = @socket_connect($this->_SOCK, $remote, $port+0)) && $attempts++ < $timeout) {
$error = socket_last_error();
if ($error != SOCKET_EINPROGRESS && $error != SOCKET_EALREADY) {
$this->errstr = "Error Connecting Socket: ".socket_strerror($error);
socket_close($this->_SOCK);
return NULL;
}
usleep(1000);
}
if (!$connected) {
$this->errstr = "Error Connecting Socket: Connect Timed Out After $timeout seconds. ".socket_strerror(socket_last_error());
socket_close($this->_SOCK);
return NULL;
}
socket_set_block($this->_SOCK);
return 1;
}
?>
mike at fserve dot us
22-Feb-2008 08:14
22-Feb-2008 08:14
This probably sounds like common sense, but it is something nobody i asked thought of... you can't bind the socket to localhost, you must bind it to either the IP your router assigns you, or your public IP address. If you bind to localhost, it will give an invalid resource error.
ScriptBlue at nyc dot rr dot com
17-Sep-2005 02:13
17-Sep-2005 02:13
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 12:26
well this solution (above) is not right because you cant ping port...
telefoontoestel at home
23-Nov-2003 06:05
23-Nov-2003 06:05
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
01-Oct-2003 05:43
01-Oct-2003 05:43
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
26-Aug-2003 06:54
26-Aug-2003 06:54
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 07:20
28-Jun-2003 07:20
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
30-Apr-2003 07:12
30-Apr-2003 07:12
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
24-Jul-2002 04:24
24-Jul-2002 04:24
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";
}