Note
:
If the socket is non-blocking then this function returns
false
with an
error
Operation now in progress
.
socket_bind()
- Binds a name to a socket
socket_listen()
- Listens for a connection on a socket
socket_create()
- Create a socket (endpoint for communication)
socket_last_error()
- Returns the last error on the socket
socket_strerror()
- Return a string describing a socket error
jerrywilborn at gmail dot com
¶
14 years ago
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, $chr);
}
w at ff dot st
¶
20 years ago
man page for connect :
EINPROGRESS
The socket is non-blocking and the connection cannot be completed immediately. It is possible to select(2) or poll(2) for completion by selecting the socket for writing. After select indicates writability, use getsockopt(2) to read the SO_ERROR option at level SOL_SOCKET to determine whether connect completed successfully (SO_ERROR is zero) or unsuccessfully (SO_ERROR is one of the usual error codes listed here, explaining the reason for the failure).
use socket_getoption($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).
maganap
¶
14 years ago
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
peter at videoripper dot org
¶
13 years ago
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.
tacapi at canela dot com
¶
6 years ago
Just a heads up guys: make sure you're passing a properly formatted IP to your ping and socket functions.
E.g.: 192.168.0.18 -> OK
192.168.0.018 -> Will result in "Unkwown host"
I was getting a 11004 error and could not solve it until I realized that was the problem.
(Pode ser que seja útil para alguém: verifique que o IP passado por parâmetro para o seu ping e funções socket é um endereço de IP corretamente formatado)
rbarnes at fake dot com
¶
15 years ago
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
) {
$ip
=
""
;
if( !
preg_match
(
'/^\d+\.\d+\.\d+\.\d+$/'
,
$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
;
$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
;
}
?>
thewanderer
¶
12 years ago
Note that as of PHP5.3 it is not possible to send IPv6 multicast to link-local addresses, because socket_connect() is just a trimmed-down version of connect() and does not support passing sin6_scope_id - the scope ID is required when sending packets to ff02::1 (all-nodes), for example.
At first I thought I needed to bind the socket to the device using SO_BINDTODEVICE option (undefined constant in PHP - use numeric value 25), but it makes no difference, only requires root privileges to produce no usable results.
Also, if you think you are sending multicast packets to link local addresses just because socket_sendto() returns a positive number of bytes, you might be wrong - just returning success does not mean that packets are sent over any link at all. In my test case I was sending to ff02::1, I could detect no errors, but Wireshark showed no packets. They end up in void.
This is irrelevant to the handling of local reception sockets, so UDP listeners should still work as usual with IPv6/UDP. You might want to resort to C for implementing multicasters, though.
seymour@itsyourdomain
¶
19 years ago
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");
?>
logan at voerthegame dot com
¶
21 years ago
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.....
<?php
$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"
;
}
?>
telefoontoestel at home
¶
19 years ago
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 ;-)
