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Bug #16877 socket_read() only gets one character (no matter what length set)
Submitted: 2002-04-27 14:41 UTC Modified: 2002-06-05 01:00 UTC
Votes:8
Avg. Score:4.8 ± 0.7
Reproduced:6 of 6 (100.0%)
Same Version:3 (50.0%)
Same OS:2 (33.3%)
From: webmaster at red-sub-tech dot ws Assigned:
Status: No Feedback Package: Sockets related
PHP Version: 4.2.0 OS: Windows 2000 Profesional
Private report: No CVE-ID: None
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Rate the importance of this bug to you:

 [2002-04-27 14:41 UTC] webmaster at red-sub-tech dot ws
The socket_read() function does not work properly, say I do this:

$text = socket_read($message_socket, 2048);

It will only get 1 character even though I said 2048 characters.

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 [2002-04-27 14:43 UTC] webmaster at red-sub-tech dot ws
The socket_read() function does not work properly, say I do this:

$text = socket_read($message_socket, 2048);

It will only get 1 character even though I said 2048 characters.
 [2002-04-27 14:57 UTC] mfischer@php.net
Please include a short, self-contained sample script (it works for me with cvs head).
 [2002-04-27 15:07 UTC] webmaster at red-sub-tech dot ws
Note this script was taken DIRECTLY from the PHP Manual (which you guys have yet to update with the new socket fixes). And I used this in Windows with a batch file (only one line on the batch file:
@c:\PHP\php-cli.exe -q c:\php\server.php )

Script:

error_reporting (E_ALL);

/* Allow the script to hang around waiting for connections. */
set_time_limit (0);

/* Turn on implicit output flushing so we see what we're getting
 * as it comes in. */
ob_implicit_flush ();

$address = 'xxx.xxx.x.xxx;
$port = 10000;

if (($sock = socket_create (AF_INET, SOCK_STREAM, 0)) < 0) {
    echo "socket_create() failed: reason: " . socket_strerror ($sock) . "\n";
}

if (($ret = socket_bind ($sock, $address, $port)) < 0) {
    echo "socket_bind() failed: reason: " . socket_strerror ($ret) . "\n";
}

if (($ret = socket_listen ($sock, 5)) < 0) {
    echo "socket_listen() failed: reason: " . socket_strerror ($ret) . "\n";
}

do {
    if (($msgsock = socket_accept($sock)) < 0) {
        echo "socket_accept() failed: reason: " . socket_strerror ($msgsock) . "\n";
        break;
    }
    /* Send instructions. */
    $msg = "\nWelcome to the PHP Test Server. \n" .
        "To quit, type 'quit'. To shut down the server type 'shutdown'.\n";
    socket_write($msgsock, $msg, strlen($msg));

    do {
        if (FALSE === ($buf = socket_read ($msgsock, 2048))) {
            echo "socket_read() failed: reason: " . socket_strerror ($ret) . "\n";
            break 2;
        }
        if (!$buf = trim ($buf)) {
            continue;
        }
        if ($buf == 'quit') {
            break;
        }
        if ($buf == 'shutdown') {
            socket_close ($msgsock);
            break 2;
        }
        $talkback = "PHP: You said '$buf'.\n";
        socket_write ($msgsock, $talkback, strlen ($talkback));
        echo "$buf\n";
    } while (true);
    socket_close ($msgsock);
} while (true);

socket_close ($sock);
 [2002-05-04 19:06 UTC] mfischer@php.net
Please try with CVS HEAD and report back. But do *not* rely on the manuals sample script, they're outdated.
 [2002-06-05 01:00 UTC] php-bugs at lists dot php dot net
No feedback was provided for this bug for over a month, so it is
being suspended automatically. If you are able to provide the
information that was originally requested, please do so and change
the status of the bug back to "Open".
 [2002-07-15 09:37 UTC] administrator at zinious dot com
Looks like a bug in the code.

I'm using Windows 2000 Server (same OS family) and am reading multiple bytes of text at one read.
 [2005-07-09 22:40 UTC] firebuddy007 at ameritech dot net
ive got one system with xp home, and one with xp pro, and socket_read only reads one character on BOTH systems
its rather frustrating
 [2007-02-03 15:31 UTC] info at tentoday dot com
This problem is still available. Currently testing on Windows XP professional SP2. Is there any workaround available? Currently the sockets are just not usable on Windows XP. I haven't tested on Windows 2003 but expect the same. Version used is: PHP 5.2.0.

Thanks for information!
 [2007-02-16 13:12 UTC] adrxc at hotmail dot com
I had spent many hours leading with that same socket_read() bugs, in Windows 2000 SP4. A way to "by-pass" the bugs is getting bytes in a loop, and omitting 'type' at socket_read() call. See the following simple telnet server:

set_time_limit (0);
ob_implicit_flush ();

$host = "127.0.0.1";
$port = 4100;

$socket = socket_create(AF_INET, SOCK_STREAM, 0) or die("Could not create socket\n");
socket_set_option($socket, SOL_SOCKET, SO_REUSEADDR, 1);
$ret = socket_bind($socket, $host, $port) or die("Could not bind to socket\n");
$ret = socket_listen($socket, 30000) or die("Could not set up socket listener\n");
$client = socket_accept($socket) or die("Could not accept incoming connection\n");

$welcome = "\n\rWelcome!";
socket_write($client, $welcome, strlen ($welcome)) or die("Could not send connect string\n");

while(1) {
	/* Ask for next input */
	$output = "\n\n\rWaiting for request ('quit' to end)... ";
	socket_write($client, $output, strlen($output)) or die("Could not write output\n");

	/* Get user message. Warning: socket_read does NOT works here if third parameter is given */
	$input = '';
	while(ord($i = socket_read($client, 1024)) != 13) {
		$input .=  $i;
		socket_write($client, $i, 1) or die("Could not write output\n");
	}
	
	/* End session? */
	if($input=="quit") {
		break;
	}

	/* Out message back */
	$output = "\n\n\rYou say '$input'";
	socket_write($client, $output, strlen($output)) or die("Could not write output\n");
}

socket_close($client);
socket_close($socket);
 [2007-11-15 05:25 UTC] mayazza at yahoo dot com
socket_read function is working but socket_write is not. is there any solution. i cannot send message from server using socket_write function.
 
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