[英]Can't connect to PHP TCP/IP Server even if the port is open?
I have a live Server (Ubuntu 14.04, running a LAMP Stack), that's working fine. 我有一个实时服务器(Ubuntu 14.04,正在运行一个LAMP Stack),工作正常。
Recently, I added in a TCP/IP Server using PHP Code. 最近,我使用PHP代码添加了TCP / IP服务器。 This is the code I used.
这是我使用的代码。 Kindly note that the IP Address is a placeholder:
请注意,IP地址是一个占位符:
<?php
error_reporting(E_ALL);
/* Allow the script to wait for connections. */
set_time_limit(0);
/* Activate the implicit exit dump, so we'll see what we're getting
* while messages come. */
ob_implicit_flush();
$address = '123.456.789.123';
$port = 1235;
if (($sock = socket_create(AF_INET, SOCK_STREAM, SOL_TCP)) === false) {
echo "socket_create() failed: reason: " . socket_strerror(socket_last_error()) . "\n";
}
if (socket_bind($sock, $address, $port) === false) {
echo "socket_bind() failed: reason: " . socket_strerror(socket_last_error($sock)) . "\n";
}
if (socket_listen($sock, 5) === false) {
echo "socket_listen() failed: reason: " . socket_strerror(socket_last_error($sock)) . "\n";
}
//clients array
$clients = array();
do {
$read = array();
$read[] = $sock;
$read = array_merge($read,$clients);
$write = NULL;
$except = NULL;
$tv_sec = 5;
// Set up a blocking call to socket_select
if(socket_select($read, $write, $except, $tv_sec) < 1)
{
// SocketServer::debug("Problem blocking socket_select?");
echo "socket continuing";
continue;
}
// Handle new Connections
if (in_array($sock, $read)) {
if (($msgsock = socket_accept($sock)) === false) {
echo "socket_accept() failed: reason: " . socket_strerror(socket_last_error($sock)) . "\n";
break;
}
$clients[] = $msgsock;
$key = array_keys($clients, $msgsock);
$msg = "\Welcome to the PHP Test Server. \n" .
"You are the customer number: {$key[0]}\n" .
"To exit, type 'quit'. To close the server type 'shutdown'.\n";
socket_write($msgsock, $msg, strlen($msg));
}
// Handle Input
foreach ($clients as $key => $client) { // for each client
if (in_array($client, $read)) {
if (false === ($buf = socket_read($client, 2048, PHP_NORMAL_READ))) {
echo "socket_read() failed: reason: " . socket_strerror(socket_last_error($client)) . "\n";
break 2;
}
if (!$buf = trim($buf)) {
continue;
}
if ($buf == 'quit') {
unset($clients[$key]);
socket_close($client);
break;
}
if ($buf == 'shutdown') {
socket_close($client);
break 2;
}
$talkback = "Client {$key}: You said '$buf'.\n";
socket_write($client, $talkback, strlen($talkback));
echo "$buf\n";
}
}
} while (true);
socket_close($sock);
?>
The code above doesn't show any errors after I uploaded it to my server and ran php filename.php
, and I think it can handle multiple connections simultaneously. 将代码上传到服务器并运行
php filename.php
,上面的代码没有显示任何错误,并且我认为它可以同时处理多个连接。
Now, to connect to the socket, I tried this php code: 现在,要连接到套接字,我尝试了以下php代码:
<?php
error_reporting(E_ALL);
$fp = fsockopen("123.456.789.123", 1235, $errno, $errstr, 30);
if (!$fp) {
echo "$errstr ($errno)<br />\n";
} else {
fwrite($fp, "You message");
while (!feof($fp)) {
echo fgets($fp, 128);
}
fclose($fp);
}
?>
Again, the IP Address is a placeholder. 同样,IP地址是一个占位符。
However, when I run this, I get the following output in my browser: 但是,运行此命令时,在浏览器中得到以下输出:
Connection refused (61)
So the first thing I do is to log in to my server, enable ufw, then allow port through. 因此,我要做的第一件事是登录服务器,启用ufw,然后允许端口通过。 After doing a verbose check on the ufw status, I have the following:
在对ufw状态进行详细检查之后,我有以下内容:
.
.
1235 ALLOW IN Anywhere
1235/tcp ALLOW IN Anywhere
1235/udp ALLOW IN Anywhere
.
.
So right now I'm not so sure what's preventing my test client from connecting to the socket. 所以现在我不太确定是什么导致我的测试客户端无法连接到套接字。
Check the IP/port match and error logs. 检查IP /端口匹配和错误日志。 Just try this:
尝试一下:
function write(&$sock,$msg) {
$msg = "$msg\n\0";
$length = strlen($msg);
while(true) {
$sent = socket_write($sock,$msg,$length);
if($sent === false) {
return false;
}
if($sent < $length) {
$msg = substr($msg, $sent);
$length -= $sent;
print("Message truncated: Resending: $msg");
} else {
return true;
}
}
return false;
}
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