On 2/27/12 9:28 PM, Olle E. Johansson wrote:
27 feb 2012 kl. 21:07 skrev Daniel-Constantin Mierla:
Hello,
an xpath invalid expression should be printed when the xpath expression is
incorrect -- I cannot say what is wrong, not being an xpath expert by hart.
However, there is a mismatching between the xml standards and SIP/SIMPLE specs.
In XML, the namespaces are bound to prefixes, while the guys at IETF added by
their own so called default namespace, which has no prefix for it. That results
in not being able to use directly xpath from libxml2 with SIMPLE bodies.
There were some discussions out there (you can google, iirc Inaki was in couple
of them), in one side, the devs of libxml2 said they don't want to break XML
standards by allowing bogus xpath queries with such namespaces. The workaround
is to define xmlns prefix in xmlops module:
http://kamailio.org/docs/modules/devel/modules/xmlops.html#xml_ns
modparam("xmlops", "xml_ns", "ri=urn:ietf:params:xml:ns:reginfo")
and try:
$xml(pub=>xpath://ri:reginfo/ri:registration@aor)
Thanks!
The weird part is that I after adding that modparam get this error message:
loading modules under
/usr/local/lib64/kamailio/modules_k/:/usr/local/lib64/kamailio/modules/
0(65556) ERROR:<core> [modparam.c:162]: set_mod_param_regex: No module
matching<xmlops> found
0(65556) :<core> [cfg.y:3504]: parse error in config file kam-modules.inc,
line 86, column 65: Can't set module parameter
This is on FreeBSD.
If I raise the debug I see the module being loaded and that it registers PVs
0(63596) DEBUG:<core> [mem/q_malloc.c:369]: qm_malloc(0x800c00000, 40)
called from xmlops: pv_xml.c: pv_parse_xml_name(448)
Weird stuff.
Kamailio 3.2.2
there was a wrong internal module name, initially I added the xml
manipulation function as part of presence_xml, but then spit them out
and made a dedicated one. But the name was not updated. The patch is now
in 3.2 branch:
http://git.sip-router.org/cgi-bin/gitweb.cgi/sip-router/?a=commit;h=3259ef734158d9cd63ce3fa94565f5cd4260e3f6
If you cannot update right now, try:
modparam("presence_xml", "xml_ns", "ri=urn:ietf:params:xml:ns:reginfo")
Not sure if it works if presence_xml is loaded, but if not, it should.
Cheers,
Daniel
--
Daniel-Constantin Mierla -- http://www.asipto.com
http://linkedin.com/in/miconda -- http://twitter.com/miconda
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