[jdev] xmppping - simple XEP-0199 pinging script

Maciek Niedzielski machekku at uaznia.net
Fri Jan 5 12:42:51 CST 2007

Peter Saint-Andre wrote:
> See here:
> http://www.xmpp.org/internet-drafts/draft-saintandre-rfc3921bis-00.html#rules

Hmm... I just noticed something.

Let's say we're pinging a client which does not support ping namespace:

Example 9. Ping Not Supported

<iq from='juliet at capulet.com/chamber'
    to='romeo at montague.net/home'
  <ping xmlns='urn:xmpp:ping'/>
  <error type='cancel'>
    <service-unavailable xmlns='urn:ietf:params:xml:ns:xmpp-stanzas'/>

Now 3921bis says:
3. Else if the JID is of the form <user at domain/resource> and no
connected or available resource matches the full JID, the recipient's
server (...)  MUST return a <service-unavailable/> stanza error to the
sender if it is an IQ stanza

So the reply above may mean both a pong and a not-pong, and it's
impossible to tell the difference.

BTW: What happened to feature-not-implemented?

Maciek                       A: It's against natural order of reading.
 xmpp:machekku at uaznia.net   Q: Why is that?
 xmpp:machekku at chrome.pl   A: People answering above quoted text.
                          Q: What's the most annoying on newsgroups?

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