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Request #63979 Get blocking state, domain, protocol of a socket
Submitted: 2013-01-12 19:48 UTC Modified: -
Votes:1
Avg. Score:5.0 ± 0.0
Reproduced:1 of 1 (100.0%)
Same Version:1 (100.0%)
Same OS:1 (100.0%)
From: arrakaij at digitalinsanity dot de Assigned:
Status: Open Package: Sockets related
PHP Version: Irrelevant OS: Linux / Ubuntu 12.04
Private report: No CVE-ID: None
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 [2013-01-12 19:48 UTC] arrakaij at digitalinsanity dot de
Description:
------------
I am writing a oop socket wrapper for sockets in php (5.3+) and am missing some functions (names are examples):

bool socket_get_blocking($socket);
/* Return whether a socket is blocking or not. streams do have this function, however, sockets do not. this information is available in php_socket struct, but there is no way to get this information. would be required for better error handling, allowing/disallowing things etc */

(following function could be written as one, returning an array)

int socket_get_domain($socket);
/* returning AF_INET, AF_INET6, AF_UNIX and so on, whichever i gave the socket_create() command */
int socket_get_protocol($socket);
/* returning SOL_TCP, SOL_UDP and so on, whichever i gave the socket_create() command */
int socket_get_type($socket);
/* returning SOCK_STREAM, SOCK_DGRAM and so on, whichever i gave the socket_create() command */

On C-Side there is e.g. the struct sockaddr that contains the domain. So it should be no problem to adapt those information into PHP.

There is a workaround getting those last three informations, however, it is very hard to find and not safe, as #defines can change. see below

Test script:
---------------
//Workaround for getting domain, type and family of an socket

$socketProtocol = socket_get_option($socket, 1, 38); //SOL_TCP, ...
$socketType = socket_get_option($socket, SOL_SOCKET, SO_TYPE); //SOCK_STREAM, ...
$socketDomain = socket_get_option($socket, 1, 39); //AF_INET,...

Expected result:
----------------
(easy) possibility to get information that are provided to sockets in php

Actual result:
--------------
for the informations mentioned, there are no functions available

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 [2014-09-20 12:09 UTC] metamarkers at gmail dot com
This has been open for almost 2 years, still not fixed in 5.5

I'll see about submitting a pull request.

Here is a workaround.

/**
* @param resource $socket
* @return int|false
*/
function socket_getdomain($socket) {

    $address = null;

    // this is the only function that tells us anything
    if (!@socket_getsockname($socket,$address)) {

        // bad socket
        if (socket_last_error($socket)) return false;

        // retrieve domain from E_WARNING
        list($errno,$errstr) = error_get_last();
        @preg_match('/address family (\d+)$/',$errstr,$errmatch);
        return intval($errmatch[1]);
    }

    elseif (filter_var(
                $address,
                FILTER_VALIDATE_IP,
                FILTER_FLAG_IPV4
            )) return AF_INET;

    elseif (filter_var(
                $address,
                FILTER_VALIDATE_IP,
                FILTER_FLAG_IPV6
           )) return AF_INET6;

    elseif (file_exists($address)) return AF_UNIX;

    else return false;

}
 [2014-09-20 12:26 UTC] metamarkers at gmail dot com
error_get_last() actually returns an associative array. oops.

replace relevant lines in my example with:

$error = error_get_last();
$errstr = $error['message'];

you get the idea
 
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