PHP Warning: socket_read(): unable to read from socket [104]: Connection reset by peer

Question

I use socket_create() to create socket Resource,then I bind an IP address to it by socket_bind(), its works fine;

But after a while(more than 30 minutes) in line socket_read($sock, 2048) this error thrown :

"PHP Warning: socket_read(): unable to read from socket [104]: Connection reset by peer in test.php on line 198".

This is my simplified code:

$this->sock = socket_create(AF_INET, SOCK_STREAM, SOL_TCP);

// check if tcp socket ceated or not
if ($this->sock === false) {
    $errorcode = socket_last_error();
    $errormsg = socket_strerror($errorcode);
     die("Couldn't create socket: [$errorcode] $errormsg");
}

// Bind the source address
socket_bind($this->sock, $this->ip);
// Connect to destination address
socket_connect($this->sock, $this->mxHost, $this->port);
$buf = socket_read($this->sock, 2048);

This piece of code make a SMTP(port 25) connection to a MX Host at the other side. Maybe it's the fault on the other side of your connection, But how can I detect that the other side isn't ready for the connection right now. In the other word how can I find out the "Connection reset by peer" occurred?

dnshio · Accepted Answer · 2014-10-28 16:42:42Z

2

You should check if socket_connect() was successful before reading from it.

so you could rewrite your code like this:

-- UPDATED --

$this->sock = socket_create(AF_INET, SOCK_STREAM, SOL_TCP);
// Bind the source address
socket_bind($this->sock, $this->ip);
// Connect to destination address
if (socket_connect($this->sock, $this->mxHost, $this->port)) {
    // suppress the warning for now since we have error checking below
    $buf = @socket_read($this->sock, 2048);

    // socket_read() returns a zero length string ("") when there is no more data to read.
    // This indicates that the socket is closed on the other side. 
    if ($buf === '') 
    { 
        throw new \Exception('Connection reset by peer'); 
    } 
} else {
    // Connection was not successful. Get the last error and throw an exception
    $errorMessage = socket_strerror(socket_last_error());
    throw new \Exception($errorMessage);
}

edited Oct 28, 2014 at 16:42

answered Oct 28, 2014 at 16:31

dnshio

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4 Comments

Arash Mousavi Over a year ago

I add some code look like yours, but socket connected successfully, and passed checking if statement, then on socket_read line throws the error.

dnshio Over a year ago

I've updated the code so that it checks if the socket_read returned any data.

Arash Mousavi Over a year ago

I put socket_connect in the if statement, but socket_connect returns true, but socket_read throws that error. :(

John Over a year ago

Wouldn't your code throw a connection reset error even if the server is fully there? You only check for an empty string, that can be timeout, connection reset or simply a server that didn't send data.

itsafire · Accepted Answer · 2014-10-28 16:28:11Z

1

Hmm... Your peer reset the connection. Maybe it's the fault on the other side of your connection ? A timeout mechanism may be running on the other side.

You could test the socket before you write to it with the socket_last_error function and recreate the connection on a disconnection.

edited Oct 28, 2014 at 16:28

answered Oct 28, 2014 at 16:15

itsafire

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2 Comments

Arash Mousavi Over a year ago

socket_last_error() doesn't shows any error after socket_create().

itsafire Over a year ago

But does it show errors just before you execute the expression that's causing the warning at a given time ? You should test your socket before issue a socket_read. In case of an error reported by 'socket_last_error` recreate your SMTP session. By doing the whole socket_create part again.

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