I want my web server to notify me through a php page when an event occurs at another TCP server, to which the PHP page has successfully connected via a socket. The event is like the TCP server wants to send a message to the web server, etc. Is there any way to accomplish this and/or any references on how to do it?
Sure:
$fp = fsockopen("tcp://example.com", 8888) OR die("could not connect");
while (!feof($fp)) {
$pc = fread($handle, 8192);
if ($pc === false || strlen($pc) == 0)
break;
//a new packet has arrived
//you should collect the read in a variable and wait
//for another packet until you know the message is complete
//(depends on the protocol)
collect_in_result($pc);
if (message_is_complete()) {
if (check_event()) {
//take action
}
}
}
Related
I am new to socket programming. I have a GPS Tracker that connects and send data to a defined public server:port through GPRS connection.
I am getting the result on the terminal.
I want to know how can I get that response in some variable so I can save those entries in database real-time.
Here is the code.
require_once("SocketServer.class.php"); // Include the File
$server = new SocketServer("xxx.xx.x.xxx",8153); // Create a Server binding to the given ip address and listen to port 31337 for connections
$server->max_clients = 10; // Allow no more than 10 people to connect at a time
$server->hook("CONNECT","handle_connect"); // Run handle_connect every time someone connects
$server->hook("INPUT","handle_input"); // Run handle_input whenever text is sent to the server
$server->infinite_loop(); // Run Server Code Until Process is terminated.
function handle_connect(&$server,&$client,$input)
{
SocketServer::socket_write_smart($client->socket,"String? ","");
}
function handle_input(&$server,&$client,$input)
{
// You probably want to sanitize your inputs here
$trim = trim($input); // Trim the input, Remove Line Endings and Extra Whitespace.
if(strtolower($trim) == "quit") // User Wants to quit the server
{
SocketServer::socket_write_smart($client->socket,"Oh... Goodbye..."); // Give the user a sad goodbye message, meany!
$server->disconnect($client->server_clients_index); // Disconnect this client.
return; // Ends the function
}
$output = strrev($trim); // Reverse the String
echo "output is".$trim;
SocketServer::socket_write_smart($client->socket,$output); // Send the Client back the String
SocketServer::socket_write_smart($client->socket,"String? ",""); // Request Another String
}
SocketServer.class.php
http://www.phpclasses.org/browse/file/31975.html
This line doesn't print the result on terminal
echo "output is".$trim;
I have tried this as well
$myfile = fopen("file.txt", "w") or die("Unable to open file!");
fwrite($myfile, $trim);
fclose($myfile);
and the file remain empty
Go to SocketServer.class.php and look for this code
the result is in this variable $input. So if you want to save data into database then add your code in else part.
if($input == null){
$this->disconnect($i);
}else{
SocketServer::debug("{$i}#{$this->clients[$i]->ip} --> {$input}");
$data= $input;
//add your code here
Note: The author has updated the code of its library. Here is the new code
https://github.com/navarr/Sockets
I'm trying to set up a TCP socket server, which should support many client connections at the same time, together with receiving and sending data.
For this purpose I'm trying to use PHP's socket_select(); due to server always hanged on socket_read(); process, where it should continue, no matter if there were data, or not. I Tried to run following code below, but it always hangs on a new client connection.
// TCP socket created
$clients = array($socket);
while (true) { // Infinite loop for server
$newsock = socket_accept($socket);
if ($newsock !== false) {
// Adds a new client
$clients[] = $newsock;
}
$read = $clients;
$write = NULL;
$except = NULL;
$num_changed_sockets = socket_select($read, $write, $except, 0);
if ($num_changed_sockets === false) {
// Error here
} else if ($num_changed_sockets > 0) {
// Something happened
if (in_array($socket, $read)) {
$key = array_search($socket, $read);
unset($read($key]);
}
foreach ($read as $read_socket) {
$data = socket_read($read_socket, 128); // This should not hang!
if ($data === false) {
// Disconnect client
}
// Reads data, sends answer...
}
}
// Something to send for all clients
}
Is it also possible to use socket_select(); without having a copy of my clients in an array, where the listener is included? Just having a clean array for clients.
Sockets are by default blocking, you should put the passive listening socket ($socket in your case) in the read set passed to socket_select as well, and it will be readable when you can accept new connections.
Just set the listening socket $socket to non-blocking mode. Clients get connected and data is being read, but the client disconnects are not handled in real time (there is a pretty big delay on it). Is there reason for that?
I've written a database application using MySQL and PHP on the server side, and Flex on the client side. I use a php socket to have it automatically update all clients whenever changes are made to the database.
The whole system works swimmingly, but every now and then the socket seems to stop responding. The strange thing is that the connection is still good – any changes a client performs are implemented, but the socket doesn't broadcast the message. The socket file isn't throwing any errors (though when I run error_log from the socket those messages appear). Memory use of the socket doesn't change on the server, and no disconnect signal is sent. Stranger still, eventually the socket starts working again, after about half an hour or so. If I restart the socket that also solves the problem.
I'm working on a hacky solution allowing the client to restart the socket if it becomes unresponsive, but that's unsatisfying and open to mistakes. What I'd really like is to learn why this might be happening. Does the socket somehow get "saturated" after a certain number of connections? Should I be doing something to clean up the socket server? I've tried three different physical servers (one local and two online) and the same thing happens, so it's definitely me.
I feel like there's something basic that I'm doing wrong. Here's the code I'm using for the socket server (it's a slightly modified version of socket written by Raymond Fain on kirupa.com, so I've left his original comment at the top):
#!/usr/bin/php -q
<?php
/*
Raymond Fain
Used for PHP5 Sockets with Flash 8 Tutorial for Kirupa.com
For any questions or concerns, email me at ray#obi-graphics.com
or simply visit the site, www.php.net, to see if you can find an answer.
*/
//ini_set('display_errors',1);
//ini_set('display_startup_errors',1);
error_reporting(E_ALL);
ini_set('error_log', 'socket_errors.log');
ini_set('log_errors', 'On');
ini_set('display_errors', 'Off');
set_time_limit(0);
ob_implicit_flush();
error_log('testing');
$address = 'xxx.xxx.xx.xx';
$port = xxxxx;
function send_Message($allclient, $socket, $buf)
{
$buf = str_replace("\0","",$buf);
//echo "<mbFeed>$buf</mbFeed>\n\0";
foreach($allclient as $client)
{
socket_write($client, "<mbFeed>$buf</mbFeed>\n\0");
}
}
echo "connecting...
";
//---- Start Socket creation for PHP 5 Socket Server -------------------------------------
if (($master = socket_create(AF_INET, SOCK_STREAM, SOL_TCP)) < 0)
{
echo "socket_create() failed, reason: " . socket_strerror($master) . "\n";
}
socket_set_option($master, SOL_SOCKET,SO_REUSEADDR, 1);
if (($ret = socket_bind($master, $address, $port)) < 0)
{
echo "socket_bind() failed, reason: " . socket_strerror($ret) . "\n";
}
echo 'socket bind successfull.
';
if (($ret = socket_listen($master, 5)) < 0)
{
echo "socket_listen() failed, reason: " . socket_strerror($ret) . "\n";
}
$read_sockets = array($master);
echo "connected.";
//---- Create Persistent Loop to continuously handle incoming socket messages ---------------------
while (true)
{
$changed_sockets = $read_sockets;
$num_changed_sockets = socket_select($changed_sockets, $write = NULL, $except = NULL, NULL);
foreach($changed_sockets as $key => $socket)
{
if ($socket == $master)
{
if (($client = socket_accept($master)) < 0)
{
echo "socket_accept() failed: reason: " . socket_strerror($msgsock) . "\n";
continue;
}
else
{
array_push($read_sockets, $client);
}
}
else
{
$bytes = socket_recv($socket, $buffer, 8192, 0);
if ($bytes == 0)
{
unset($read_sockets[$key]);
unset($changed_sockets[$key]);
socket_close($socket);
}
else
{
$allclients = $read_sockets;
array_shift($allclients);
//any messages starting with ::: are not to be broadcast, and may be used for other things. This message
//usually comes from the client.
if (substr($buffer, 0, 3) == ":::") handleSpecial(substr($buffer, 3));
else
{
//otherwise the message comes from a php file that will be closed, so the socket needs to be closed.
unset($read_sockets[$key]);
unset($changed_sockets[$key]);
socket_close($socket);
send_Message($allclients, $socket, $buffer);
}
}
}
}
}
function handleSpecial($message)
{
error_log($message);
}
?>
As the sockets in use seem to be blocking the call to socket_recv() might not return until the amount of data requested was read. And with this does not handle any other reading sockets, including the accecpting socket.
To get around this use socket_set_nonblock() to make the sockets unblocking. Please note that a call to socket_recv() on a non-blocking socket might return having read less bytes than requested, and therefore the amount of data read shall be tracked for each socket.
Here is the code that I am using:
if (!($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.
Like many people, I can do a lot of things with PHP. One problem I do face constantly is that other people can do it much cleaner, much more organized and much more structured. This also results in much faster execution times and much less bugs.
I just finished writing a basic PHP Socket Server (the real core), and am asking you if you can tell me what I should do different before I start expanding the core. I'm not asking about improvements such as encrypted data, authentication or multi-threading.
I'm more wondering about questions like "should I maybe do it in a more object oriented way (using PHP5)?", or "is the general structure of the way the script works good, or should some things be done different?". Basically, "is this how the core of a socket server should work?"
In fact, I think that if I just show you the code here many of you will immediately see room for improvements. Please be so kind to tell me. Thanks!
#!/usr/bin/php -q
<?
// config
$timelimit = 180; // amount of seconds the server should run for, 0 = run indefintely
$address = $_SERVER['SERVER_ADDR']; // the server's external IP
$port = 9000; // the port to listen on
$backlog = SOMAXCONN; // the maximum of backlog incoming connections that will be queued for processing
// configure custom PHP settings
error_reporting(1); // report all errors
ini_set('display_errors', 1); // display all errors
set_time_limit($timelimit); // timeout after x seconds
ob_implicit_flush(); // results in a flush operation after every output call
//create master IPv4 based TCP socket
if (!($master = socket_create(AF_INET, SOCK_STREAM, SOL_TCP))) die("Could not create master socket, error: ".socket_strerror(socket_last_error()));
// set socket options (local addresses can be reused)
if (!socket_set_option($master, SOL_SOCKET, SO_REUSEADDR, 1)) die("Could not set socket options, error: ".socket_strerror(socket_last_error()));
// bind to socket server
if (!socket_bind($master, $address, $port)) die("Could not bind to socket server, error: ".socket_strerror(socket_last_error()));
// start listening
if (!socket_listen($master, $backlog)) die("Could not start listening to socket, error: ".socket_strerror(socket_last_error()));
//display startup information
echo "[".date('Y-m-d H:i:s')."] SERVER CREATED (MAXCONN: ".SOMAXCONN.").\n"; //max connections is a kernel variable and can be adjusted with sysctl
echo "[".date('Y-m-d H:i:s')."] Listening on ".$address.":".$port.".\n";
$time = time(); //set startup timestamp
// init read sockets array
$read_sockets = array($master);
// continuously handle incoming socket messages, or close if time limit has been reached
while ((!$timelimit) or (time() - $time < $timelimit)) {
$changed_sockets = $read_sockets;
socket_select($changed_sockets, $write = null, $except = null, null);
foreach($changed_sockets as $socket) {
if ($socket == $master) {
if (($client = socket_accept($master)) < 0) {
echo "[".date('Y-m-d H:i:s')."] Socket_accept() failed, error: ".socket_strerror(socket_last_error())."\n";
continue;
} else {
array_push($read_sockets, $client);
echo "[".date('Y-m-d H:i:s')."] Client #".count($read_sockets)." connected (connections: ".count($read_sockets)."/".SOMAXCONN.")\n";
}
} else {
$data = #socket_read($socket, 1024, PHP_NORMAL_READ); //read a maximum of 1024 bytes until a new line has been sent
if ($data === false) { //the client disconnected
$index = array_search($socket, $read_sockets);
unset($read_sockets[$index]);
socket_close($socket);
echo "[".date('Y-m-d H:i:s')."] Client #".($index-1)." disconnected (connections: ".count($read_sockets)."/".SOMAXCONN.")\n";
} else {
if ($data = trim($data)) { //remove whitespace and continue only if the message is not empty
switch ($data) {
case "exit": //close connection when exit command is given
$index = array_search($socket, $read_sockets);
unset($read_sockets[$index]);
socket_close($socket);
echo "[".date('Y-m-d H:i:s')."] Client #".($index-1)." disconnected (connections: ".count($read_sockets)."/".SOMAXCONN.")\n";
break;
default: //for experimental purposes, write the given data back
socket_write($socket, "\n you wrote: ".$data);
}
}
}
}
}
}
socket_close($master); //close the socket
echo "[".date('Y-m-d H:i:s')."] SERVER CLOSED.\n";
?>
One small thing, personally i'd create a function for outputting instead of just using echo, that way its easy to turn it off, change the format etc.. eg
function log($message = '')
{
echo '['.date('Y-m-d H:i:s').']'.$message;
}
and then you can use :
log("SERVER CREATED (MAXCONN: ".SOMAXCONN.").\n");
instead of
echo "[".date('Y-m-d H:i:s')."] SERVER CREATED (MAXCONN: ".SOMAXCONN.").\n";
Oh and be sure to use === instead of == otherwise you might get some odd results.
I'd move your switch $data into a function as that will likely expand.
Also since it looks like you're using a text based protocol, might want to explode/strtok to get the first level command and check it against an array of valid commands. Could also have an array that describes what internal function to call and use call_user_func_array to dispatch the call.