A nagios compatible check plugin for XMPP servers implementing the XMPP protocol as specified in RFC 6120.

The plugin provides the following features:

- check client to server (C2S) as well as server to server (S2S) ports - check XMPP servers on IPv6 and IPv4 addresses - support STARTTLS as specified in RFC 6120 section 5. - check the validity of the server certificate presented by the XMPP server

The plugin has been implemented because of insufficiencies in the existing check_ssl_cert and check_xmpp plugins.