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+;; jabber-ping.el - XMPP "Ping" by XEP-0199
+
+;; Copyright (C) 2009 - Evgenii Terechkov - evg@altlinux.org
+
+;; This file is a part of jabber.el.
+
+;; This program is free software; you can redistribute it and/or modify
+;; it under the terms of the GNU General Public License as published by
+;; the Free Software Foundation; either version 2 of the License, or
+;; (at your option) any later version.
+
+;; This program is distributed in the hope that it will be useful,
+;; but WITHOUT ANY WARRANTY; without even the implied warranty of
+;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+;; GNU General Public License for more details.
+
+;; You should have received a copy of the GNU General Public License
+;; along with this program; if not, write to the Free Software
+;; Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
+
+(require 'jabber-iq)
+(require 'jabber-util)
+(require 'jabber-menu)
+(require 'jabber-disco)
+
+(add-to-list 'jabber-jid-info-menu
+	     (cons "Ping" 'jabber-ping))
+
+(defun jabber-ping-send (jc to process-func on-success on-error)
+  "Send XEP-0199 ping IQ stanza. JC is connection to use, TO is
+  full JID, PROCESS-FUNC is fucntion to call to process result,
+  ON-SUCCESS and ON-ERROR is arg for this function depending on
+  result."
+  (jabber-send-iq jc to "get"
+                  '(ping ((xmlns . "urn:xmpp:ping")))
+                  process-func on-success
+                  process-func on-error))
+
+(defun jabber-ping (to)
+  "Ping XMPP entity. TO is full JID. All connected JIDs is used."
+  (interactive (list (jabber-read-jid-completing "Send ping to: " nil nil nil 'full)))
+  (dolist (jc jabber-connections)
+    (jabber-ping-send jc to 'jabber-silent-process-data 'jabber-process-ping "Ping is unsupported")))
+
+;; called by jabber-process-data
+(defun jabber-process-ping (jc xml-data)
+  "Handle results from ping requests."
+  (let ((to (jabber-xml-get-attribute xml-data 'from)))
+    (format "%s is alive" to)))
+
+(add-to-list 'jabber-iq-get-xmlns-alist (cons "urn:xmpp:ping" 'jabber-pong))
+(jabber-disco-advertise-feature "urn:xmpp:ping")
+
+(defun jabber-pong (jc xml-data)
+  "Return pong as defined in XEP-0199. Sender and Id are
+determined from the incoming packet passed in XML-DATA."
+  (let ((to (jabber-xml-get-attribute xml-data 'from))
+	(id (jabber-xml-get-attribute xml-data 'id)))
+    (jabber-send-iq jc to "result" nil nil nil nil nil id)))
+
+(provide 'jabber-ping)