I'm trying to make a simple UDP client server example in PHP but I face an error.
This is the client :
$fp = stream_socket_client("udp://192.168.0.12:12478", $errno, $errstr);
if ($fp)
{
fwrite($fp, "TEST 1 TEST 2 TEST 3");
$buf = fgets($fp);
var_dump($buf);
fclose($fp);
}
This is the server :
$socket = stream_socket_server("udp://192.168.0.12:12478", $errno, $errstr, STREAM_SERVER_BIND);
if ($socket)
{
while ($conn = stream_socket_accept($socket)) {
fwrite($conn, date("D M j H:i:s Y\r\n"));
fclose($conn);
}
fclose($socket);
}
All executions end with :
Warning: stream_socket_accept(): accept failed: Operation not supported
Basically, this is the example given in all PHP documentations but I can't figure what is wrong in it. Any help is greatly appreciated.
Thanks.
Here is the warning on the very same page
Warning
This function should not be used with UDP server sockets. Instead,
use stream_socket_recvfrom() and
stream_socket_sendto().
according to the documentation: "you cannot make a silk piurse from a sow's ear"
stream_socket_connect is intended for STREAMS, not datagram packets. recvfrom would be more likely to work in this scenario.
Related
I've worked hours and hours on this, and I can't figure it out. I've browsed the posts on here trying to find the solution also and to no avail.
I have a Socket Server setup for my browser-based game. I've stripped it down trying to find the issue, and it seems that fread is hanging because if I comment out "fread($fp, 10024);" then it runs fine, but of course doesn't read the response.
While I debug this, I've broken the files down to the basics.
I have the Socket Server: ChatServer.php
set_time_limit(0);
$sock = socket_create(AF_INET, SOCK_STREAM, SOL_TCP);
socket_get_option($sock, SOL_SOCKET, SO_REUSEADDR);
socket_bind($sock, "127.0.0.1", "9990");
socket_listen($sock, 4);
$chatContent = "Testing, 1, 2, 3.";
do
{
$childSocket = socket_accept($sock);
$incomingData = socket_read($childSocket, 12048);
socket_write($childSocket, $chatContent, strlen($chatContent));
} while(true);
Then I have Test.php which should open the socket and read a response.
$fp = fsockopen("127.0.0.1", "9990", $errno, $errstr, 5);
echo $errstr . "<br />";
echo fread($fp, 10024);
$errstr doesn't display an error, because when I start ChatServer.php then reload Test.php, it never reloads. It hangs for minutes and lags my entire server. I'm running on a VPS. This worked fine before, then suddenly stopped working, and I can't figure out why.
Edit: Thanks to GigaWatt, I was able to get it working. Here is the code I used if you have the same issue. :)
set_time_limit(0);
$sock = socket_create(AF_INET, SOCK_STREAM, SOL_TCP);
socket_get_option($sock, SOL_SOCKET, SO_REUSEADDR);
socket_bind($sock, "127.0.0.1", "9990");
socket_listen($sock, 4);
$chatContent = "Testing, 1, 2, 3.";
do
{
$childSocket = socket_accept($sock);
$meta = stream_get_meta_data($sock);
if($meta['unread_bytes'] > 0) {
$incomingData = socket_read($childSocket, $meta['unread_bytes']);
}
socket_write($childSocket, $chatContent, strlen($chatContent));
} while(true);
Just use stream_get_meta_data and then unread_bytes.
The call to socket_read is a blocking call, meaning everything stops until the specified number of bytes have been read.
If you need to continue processing, consider using stream_get_meta_data (the unread_bytes value) to check how much unread data is waiting.
Once it reaches the desired threshold, then call socket_read.
http://us3.php.net/manual/en/function.stream-get-meta-data.php
It does exactly what you tell it to: waits for 12048 / 10024 bytes of data or socket being closed.
You might be interested in using a non-blocking socket (socket_set_nonblock/stream_set_blocking) and a socket_select loop or libevent.
I'm trying to use fsockopen to communicate with a game server, which responds with some basic stats. It works perfectly when the server is online, but if the server is ever offline, the following code causes php to stop displaying the page that reads the data.
try {
$socket = fsockopen($host, $port, $errno, $errstr, 10);
if ($socket !== false) {
fwrite($socket, "\xFE");
$data = "";
$data = fread($socket, 1024);
fclose($socket);
if ($data !== false && substr($data, 0, 1) == "\xFF") {
// get into
} else {
// Server did not send back proper data, or reading from socket failed.
print "Server not available.";
}
} else {
// ...
}
} catch(Exception $e){
// ...
}
I've tried the try/catch, I've tried adding a custom handler to the exception. My only idea is to run this outside of the web requests and store the response so that the web request isn't initiating it.
Any thoughts?
First, I'd add a couple of echo commands, either side of the fsockopen call:
echo date("Y-m-d H:i:s")."Before open\n";
$socket = fsockopen($host, $port, $errno, $errstr, 10);
echo date("Y-m-d H:i:s")."After open (socket=".($socket===false?"Bad":"OK")."\n";
This is to confirm the 10 second timeout is working. If you never see the second message then the timeout is not working, and the problem is more obscure.
Anyway, if you are getting a valid $socket, but the lock-up happens later, then try:
if ($socket !== false) {
stream_set_timeout($socket,2); //2 second timeout
stream_set_blocking($socket,false); //no blocking
fwrite($socket, "\xFE");
...
P.S. If adding those two commands solves the problem, then experiment to see if just one of them solves it. That would give a big clue what the real problem is.
It seems that by moving the logic outside the html generation worked. The lookup happens before any html is rendered, so if it fails it doesn't interrupt the html output.
Here is the code that I am using:
if (!($fp = fsockopen('ssl://imap.gmail.com', '993', $errno, $errstr, 15)))
echo "Could not connect to host";
$server_response = fread($fp, 256);
echo $server_response;
fwrite($fp, "C01 CAPABILITY"."\r\n");
while (!feof($fp)) {
echo fgets($fp, 256);
}
I get the first response:
OK Gimap ready for requests from xx.xx.xx.xx v3if9968808ibd.15
but then the page times out. I have searched through stream_set_blocking, stream_set_timeout, stream_select, fread, etc. but could not get it to work. I need to read all the data that the server sends and then proceed with other commands (I would be retrieving emails using imap).
Thanks
Your script is hanging in the while loop at the end. This is because you have used !feof() as the condition for the loop, and the server is not closing the connection. This means the feof() will always return false and the loop will continue forever.
This will not be problem when your write a full implementation, as you will be looking for response codes and can break out of the loop accordingly, for example:
<?php
// Open a socket
if (!($fp = fsockopen('ssl://imap.gmail.com', 993, $errno, $errstr, 15))) {
die("Could not connect to host");
}
// Set timout to 1 second
if (!stream_set_timeout($fp, 1)) die("Could not set timeout");
// Fetch first line of response and echo it
echo fgets($fp);
// Send data to server
echo "Writing data...";
fwrite($fp, "C01 CAPABILITY\r\n");
echo " Done\r\n";
// Keep fetching lines until response code is correct
while ($line = fgets($fp)) {
echo $line;
$line = preg_split('/\s+/', $line, 0, PREG_SPLIT_NO_EMPTY);
$code = $line[0];
if (strtoupper($code) == 'C01') {
break;
}
}
echo "I've finished!";
Your script should be working. In fact, it is working.
See the results below on my pc when I ran your code:
* OK Gimap ready for requests from xx.xx.xx.xx l5if4585958ebb.20
* CAPABILITY IMAP4rev1 UNSELECT IDLE NAMESPACE QUOTA ID XLIST CHILDREN X-GM-EXT-1 XYZZY SASL-IR AUTH=XOAUTH
C01 OK Thats all she wrote! l5if4585958ebb.20
Since gmail doesn't disconnect you. No end of file occurs. And the page loading simply times out.
In other words: Your script will just keep waiting and waiting until gmail does disconnect, which unfortunately happens after your page load has already timed out.
I am trying to connect to an IRC server via PHP on a command line using Windows 7.
Everytime when running this:
$socket = fsockopen($irc_server, 6667, $errno, $errstr, 5);
$errno = 0, $errstr = "" and $socket = 'Resource id #4' (using die($socket);)
What is the cause of this, and how can I debug more into this.
The following code:
$s = fsockopen("google.com", 80, $errno, $errstr, 5);
die($errno.", ".$errstr.", ".$s);
...returns the following:
0, , Resource id #4
I can't use $socket. It says "Invalid resource" when I try to use it. Also, the PHP documentation notes that errno 0 indicates a wrongly opened socket.
Help is appreciated.
Could you show us a little more of your code?
What happens with this code:
$s = fsockopen($irc_server, 6667, $errno, $errstr, 5);
if ($s === false) {
die($errno.", ".$errstr.", ".$s);
} else {
// your code with socket
die("Valid socket resource");
}
?
I fixed it.
function irCmd didn't know $socket, so I put this in front of it:
global $socket;
And it worked. Thanks a bunch!
The documentation says (emphasis mine):
If the value returned in errno is 0 and the function returned FALSE, it is an indication that the error occurred before the connect() call. This is most likely due to a problem initializing the socket.
Since the function did not return false, the socket is valid. If you are having further problems, tells us what they are; fsockopen has returned normally here.
I have a very simple server php code like this
function listenForClients()
{
$this->serviceConnection = socket_create(AF_UNIX, SOCK_STREAM, 0);
socket_bind($this->serviceConnection, "\tmp\mysock", 0);
socket_listen($this->serviceConnection, 10000000);
while($clientSocket = socket_accept($this->serviceConnection))
{
$clientMessage = socket_read($clientSocket, 1024);
socket_close($clientSocket);
}
}
Then I have a very simple client that does this
for ( $counter = 0; $counter <= 1000; $counter ++) {
$fp = fsockopen("unix///tmp/mysock", 0, $errno, $errstr);
if (!$fp){
echo "Error: Could not open socket connection at " . $counter . "\n";
exit;
}else{
fputs ($fp, "hello", strlen("hello"));
fclose($fp);
}
}
For some reason, after a random number of connections (around 300-500) fsockopen will return with a warning Resource temporarily unavailable. In the beginning I was getting the warning at around 20-30 connections. But once I increased the backlog parameter in socket_listen it got a bit better to around 300-500. How do I overcome this?
What is the way to build a php server socket to accept a lot of incoming connections per second (sustained).
Thanks!
The full error:
PHP Warning: fsockopen(): unable to
connect to unix:///tmp/mysock:0
(Resource temporarily unavailable) in
test.php on line 22
Check your ulimit. Are you overflowing your file descriptor table?
EDIT: the backlog value you have in accept() is bogus. Most OS-es have the max incoming connection queue size on the scale of dozens, not thousands.
I've just been looking at this issue (got here through Google) and I've found that a solution to get rid of the error:
PHP Warning: fsockopen(): unable to connect to unix:///tmp/mysock:0 (Resource temporarily unavailable) in test.php on line 22
..is to not use fsockopen() in the writer thread; try something like this instead:
if (! ($cSock = socket_create(AF_UNIX, SOCK_STREAM, 0))) {
exit("Failed to create socket");
continue;
} else if (! socket_connect($cSock, IPC_SOCK)) {
exit("Failed to connect socket");
} else {
$bw = socket_write($cSock, $msg);
if ($bw === false) {
exit("Socket write failed, %s", array(socket_strerror(socket_last_error())));
} else {
exit("Wrote $bw bytes to socket");
}
}
socket_shutdown($cSock);
socket_close($cSock);
Better late than never ? ;-)