--- a/mod_ipcheck/mod_ipcheck.lua	Mon Dec 02 03:08:17 2013 +0000
+++ b/mod_ipcheck/mod_ipcheck.lua	Wed Dec 04 17:37:32 2013 +0100
@@ -20,3 +20,25 @@
 		return true;
 	end
 end);
+
+module:add_feature("urn:xmpp:sic:1");
+
+module:hook("iq/bare/urn:xmpp:sic:1:address", function(event)
+	local origin, stanza = event.origin, event.stanza;
+	if stanza.attr.type == "get" then
+		if stanza.attr.to then
+			origin.send(st.error_reply(stanza, "auth", "forbidden", "You can only ask about your own IP address"));
+		elseif origin.ip then
+			local reply = st.reply(stanza):tag("address", {xmlns='urn:xmpp:sic:0'})
+				:tag("ip"):text(origin.ip):up()
+			if origin.conn and origin.conn.port then
+				reply:tag("port"):text(tostring(origin.conn:port()))
+			end
+			origin.send(reply);
+		else
+			-- IP addresses should normally be available, but in case they are not
+			origin.send(st.error_reply(stanza, "cancel", "service-unavailable", "IP address for this session is not available"));
+		end
+		return true;
+	end
+end);