To further my understanding of how Jabber works I have decided I should
try and write my own XMPP implementation in PHP. However, I've run into
trouble rather quickly.
To connect to a Jabber server, one must open a TCP socket to the server
(typically through port 5269) send an XML-based stream header, wait for
the server's confirmation and then log in, etc. As an initial test I
tried to open a TCP socket, send a stream header, get the server's
response, then disconnect. I did so thusly:
$server = "jabber.org"; //example server
$port = 5269; //default port
$nsStream = "http://etherx.jabber.org/streams";; // Streams namespace
$socket = stream_socket_client("tcp://$server:$port");
$header = "<stream:stream to='$server' xmlns='jabber:client'
xmlns:stream='$nsClient' xml:lang='en' version='1.0'>";
fwrite($socket, $header); //send header
echo stream_get_contents($socket); //get server confirmation
//close connection
fwrite($socket, "</stream:stream>");
fclose($socket);
I'm supposed to get something like this in reply (taken from my desktop
Jabber client's debug window):
<?xml version='1.0'?>
<stream:stream xmlns:stream='http://etherx.jabber.org/streams'
id='4468F937' xmlns='jabber:client'
from='jabber.org'>
Instead, I get this error message:
<stream:error>
<invalid-namespace
xmlns='urn:ietf:params:xml:ns:xmpp-streams'/>
</stream:error>
That I get a conformant Jabber error message suggests that I -am- at least
connecting to the server properly, but that the data is not getting to the
server intact. I am certain that the XML header is correct: I also tested
another PHP Jabber implementation[1] with the same result, even though a
search of this mailing list suggests that said implementation has been
known to work for other people. Since I tested it on two different
machines (my home Windows computer and a Linux Dreamhost Web server) using
three different versions of PHP (PHP 5.1.4 Winodws CLI, PHP 4.3.3 Windows
CLI, PHP 5.1.1 Linux FastCGI), it's pretty clear that it's not a bug in
the version of PHP I initially tested on. I also tried connecting to
three different Jabber servers (my private dark-phantasy server,
jabber.org, and a test Wildfire server on my colleague's machine) and all
three gave me similar errors (with differing levels of spec compliance...).
In short, I am stumped. If anyone with some experience in these matters
could shed some light on my problem I would be most grateful.
[1] <http://cjphp.netflint.net/>
--
J. King
http://jking.dark-phantasy.com/
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