[SR-Users] Issue with xpath in kamailio 4.0.2

Daniel-Constantin Mierla miconda at gmail.com
Wed Sep 4 23:09:48 CEST 2013 

Hello,

the error is thrown by xmlXPathEvalExpression() from libxml2, meaning 
that it considers the xpath expression to be invalid.

I am not that familiar with the grammar for xpath, but probably libxml2 
has a good implementation and 
'presence/pdm:person?xmlns(pdm=urn:ietf:params:xml:ns:pidf:data-model)' 
is not a good xpath value.

What client sends it? Can you capture the http request with ngrep and 
send it here?

Cheers,
Daniel

On 9/4/13 4:34 PM, Ram Anji wrote:
> I found the following statement in log which causes to fail.
>
> xcap_server [xcap_misc.c:475]: xcaps_xpath_set(): unable to evaluate 
> xpath expression 
> [/presence/pdm:person?xmlns(pdm=urn:ietf:params:xml:ns:pidf:data-model)]
>
>
> Here are the logs which are requested.
>
> Aug 30 21:31:11 kamailio kamailio[9460]: ERROR: *** cfgtrace: 
> c=[/usr/local/etc/kamailio/kamailio.cfg] l=615 a=5 n=route
> Aug 30 21:31:11 kamailio kamailio[9520]: DEBUG: <core> [db_res.c:136]: 
> db_free_result(): freeing result set at 0xb71c3d28
> Aug 30 21:31:11 kamailio kamailio[9460]: ERROR: *** cfgtrace: 
> c=[/usr/local/etc/kamailio/kamailio.cfg] l=957 a=2 n=return
> Aug 30 21:31:11 kamailio kamailio[9520]: ERROR: xcap_server 
> [xcap_misc.c:475]: xcaps_xpath_set(): unable to evaluate xpath 
> expression 
> [/presence/pdm:person?xmlns(pdm=urn:ietf:params:xml:ns:pidf:data-model)]
> Aug 30 21:31:11 kamailio kamailio[9460]: ERROR: *** cfgtrace: 
> c=[/usr/local/etc/kamailio/kamailio.cfg] l=627 a=16 n=if
> Aug 30 21:31:11 kamailio kamailio[9520]: ERROR: xcap_server 
> [xcap_server.c:619]: w_xcaps_put(): could not update xcap document
> Aug 30 21:31:11 kamailio kamailio[9460]: ERROR: *** cfgtrace: 
> c=[/usr/local/etc/kamailio/kamailio.cfg] l=618 a=25 n=is_method
> Aug 30 21:31:11 kamailio kamailio[9520]: DEBUG: sl [sl.c:289]: 
> send_reply(): reply in stateless mode (sl)
> Aug 30 21:31:11 kamailio kamailio[9460]: ERROR: *** cfgtrace: 
> c=[/usr/local/etc/kamailio/kamailio.cfg] l=627 a=5 n=route
> Aug 30 21:31:11 kamailio kamailio[9520]: DEBUG: <core> 
> [parser/msg_parser.c:339]: parse_headers(): parse_headers: flags=8
> Aug 30 21:31:11 kamailio kamailio[9460]: ERROR: *** cfgtrace: 
> c=[/usr/local/etc/kamailio/kamailio.cfg] l=771 a=16 n=if
> Aug 30 21:31:11 kamailio kamailio[9520]: DEBUG: <core> 
> [parser/msg_parser.c:339]: parse_headers(): parse_headers: 
> flags=ffffffffffffffff
> Aug 30 21:31:11 kamailio kamailio[9460]: ERROR: *** cfgtrace: 
> c=[/usr/local/etc/kamailio/kamailio.cfg] l=731 a=24 n=has_totag
> Aug 30 21:31:11 kamailio kamailio[9520]: DEBUG: <core> 
> [msg_translator.c:206]: check_via_address(): 
> check_via_address(192.168.41.60, 192.168.41.60, 0)
> Aug 30 21:31:11 kamailio kamailio[9460]: DEBUG: siputils 
> [checks.c:103]: has_totag(): no totag
> Aug 30 21:31:11 kamailio kamailio[9520]: DEBUG: <core> 
> [tcp_main.c:1497]: _tcpconn_find(): tcpconn_find: 33  port 58665
> Aug 30 21:31:11 kamailio kamailio[9460]: ERROR: *** cfgtrace: 
> c=[/usr/local/etc/kamailio/kamailio.cfg] l=631 a=24 n=t_check_trans
> Aug 30 21:31:11 kamailio kamailio[9520]: DEBUG: <core> 
> [ip_addr.c:247]: print_ip(): tcpconn_find: ip 192.168.41.60
> Aug 30 21:31:11 kamailio kamailio[9460]: DEBUG: tm [t_lookup.c:1095]: 
> t_check_msg(): DEBUG: t_check_msg: msg id=165 global id=163 T start=(nil)
> Aug 30 21:31:11 kamailio kamailio[9520]: DEBUG: <core> 
> [tcp_main.c:1504]: _tcpconn_find(): c=0xb49ba648, c->id=33, port=58665
> Aug 30 21:31:11 kamailio kamailio[9460]: DEBUG: <core> 
> [parser/msg_parser.c:339]: parse_headers(): parse_headers: 
> flags=ffffffffffffffff
> Aug 30 21:31:11 kamailio kamailio[9520]: DEBUG: <core> 
> [ip_addr.c:247]: print_ip(): ip=192.168.41.60
> Aug 30 21:31:11 kamailio kamailio[9460]: DEBUG: <core> 
> [parser/msg_parser.c:339]: parse_headers(): parse_headers: flags=78
> Aug 30 21:31:11 kamailio kamailio[9520]: DEBUG: <core> 
> [tcp_main.c:2330]: tcpconn_send_put(): tcp_send: send from reader 
> (9520 (27)), reusing fd
> Aug 30 21:31:11 kamailio kamailio[9460]: DEBUG: tm [t_lookup.c:534]: 
> t_lookup_request(): t_lookup_request: start searching: hash=14466, isACK=0
> Aug 30 21:31:11 kamailio kamailio[9520]: DEBUG: <core> 
> [tcp_main.c:2566]: tcpconn_do_send(): tcp_send: sending...
> Aug 30 21:31:11 kamailio kamailio[9460]: DEBUG: tm [t_lookup.c:492]: 
> matching_3261(): DEBUG: RFC3261 transaction matching failed
> Aug 30 21:31:11 kamailio kamailio[9520]: DEBUG: <core> 
> [tcp_main.c:2600]: tcpconn_do_send(): tcp_send: after real write: c= 
> 0xb49ba648 n=125 fd=14
> Aug 30 21:31:11 kamailio kamailio[9460]: DEBUG: tm [t_lookup.c:716]: 
> t_lookup_request(): DEBUG: t_lookup_request: no transaction found
> Aug 30 21:31:11 kamailio kamailio[9520]: DEBUG: <core> 
> [tcp_main.c:2601]: tcpconn_do_send(): tcp_send: buf=#012HTTP/1.1 500 
> Server error#015#012Via: SIP/2.0/TCP 192.168.41.60:58665#015#012Server 
> <http://192.168.41.60:58665#015#012Server>: kamailio (4.0.2 
> (i386/linux))#015#012Content-Length: 0#015#012#015#012
> Aug 30 21:31:11 kamailio kamailio[9460]: DEBUG: tm [t_lookup.c:1164]: 
> t_check_msg(): DEBUG: t_check_msg: msg id=165 global id=165 T end=(nil)
> Aug 30 21:31:11 kamailio kamailio[9525]: DEBUG: <core> 
> [tcp_main.c:3634]: handle_ser_child(): handle_ser_child: read 
> response= b49ba648, -1, fd -1 from 27 (9520)
> Aug 30 21:31:11 kamailio kamailio[9520]: ERROR: *** cfgtrace: 
> c=[/usr/local/etc/kamailio/kamailio.cfg] l=1231 a=16 n=if
> Aug 30 21:31:11 kamailio kamailio[9460]: ERROR: *** cfgtrace: 
> c=[/usr/local/etc/kamailio/kamailio.cfg] l=634 a=5 n=route
> Aug 30 21:31:11 kamailio kamailio[9460]: ERROR: *** cfgtrace: 
> c=[/usr/local/etc/kamailio/kamailio.cfg] l=921 a=16 n=if
> Aug 30 21:31:11 kamailio kamailio[9460]: ERROR: *** cfgtrace: 
> c=[/usr/local/etc/kamailio/kamailio.cfg] l=905 a=25 n=is_method
> Aug 30 21:31:11 kamailio kamailio[9460]: ERROR: *** cfgtrace: 
> c=[/usr/local/etc/kamailio/kamailio.cfg] l=934 a=16 n=if
> Aug 30 21:31:11 kamailio kamailio[9460]: ERROR: *** cfgtrace: 
> c=[/usr/local/etc/kamailio/kamailio.cfg] l=921 a=25 n=is_method
> Aug 30 21:31:11 kamailio kamailio[9460]: DEBUG: <core> 
> [parser/parse_uri.c:1241]: parse_uri(): parsed uri:#012 type=1 
> user=<test>(6)#012 passwd=<>(0)#012 host=<kamailio.com 
> <http://kamailio.com>>(22)#012 port=<>(0): 0#012 params=<>(0)#012 
> headers=<>(0)
> Aug 30 21:31:11 kamailio kamailio[9460]: DEBUG: <core> 
> [parser/parse_uri.c:1242]: parse_uri():  uri flags :
> Aug 30 21:31:11 kamailio kamailio[9460]: DEBUG: <core> 
> [parser/parse_uri.c:1245]: parse_uri():  value=0
> Aug 30 21:31:11 kamailio kamailio[9460]: DEBUG: <core> 
> [parser/parse_uri.c:1248]: parse_uri():  uri params:#012   
> transport=<>, val=<>, proto=0
> Aug 30 21:31:11 kamailio kamailio[9460]: DEBUG: <core> 
> [parser/parse_uri.c:1251]: parse_uri():  user-param=<>, val=<>
> Aug 30 21:31:11 kamailio kamailio[9460]: DEBUG: <core> 
> [parser/parse_uri.c:1254]: parse_uri():  method=<>, val=<>
> Aug 30 21:31:11 kamailio kamailio[9460]: DEBUG: <core> 
> [parser/parse_uri.c:1257]: parse_uri():  ttl=<>, val=<>
> Aug 30 21:31:11 kamailio kamailio[9460]: DEBUG: <core> 
> [parser/parse_uri.c:1260]: parse_uri():  maddr=<>, val=<>
> Aug 30 21:31:11 kamailio kamailio[9460]: DEBUG: <core> 
> [parser/parse_uri.c:1261]: parse_uri():  lr=<>
> Aug 30 21:31:11 kamailio kamailio[9460]: DEBUG: <core> 
> [parser/parse_uri.c:1262]: parse_uri():  r2=<>
> Aug 30 21:31:11 kamailio kamailio[9460]: DEBUG: <core> 
> [socket_info.c:589]: grep_sock_info(): grep_sock_info - checking if 
> host==us: 22==25 && [kamailio.com <http://kamailio.com>] == 
> [2607:F0D0:2001:0:0:0:0:12]
> Aug 30 21:31:11 kamailio kamailio[9460]: DEBUG: <core> 
> [socket_info.c:593]: grep_sock_info(): grep_sock_info - checking if 
> port 5060 (advertise 0) matches port 5060
> Aug 30 21:31:11 kamailio kamailio[9460]: DEBUG: <core> 
> [socket_info.c:589]: grep_sock_info(): grep_sock_info - checking if 
> host==us: 22==13 && [kamailio.com <http://kamailio.com>] == 
> [192.168.41.10]
>
>
>
> Regards,
> Anzi
>
>
>
>
> _______________________________________________
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-- 
Daniel-Constantin Mierla - http://www.asipto.com
http://twitter.com/#!/miconda - http://www.linkedin.com/in/miconda
Kamailio Advanced Trainings - Berlin, Oct 21-24; Miami, Nov 11-13, 2013
   - more details about Kamailio trainings at http://www.asipto.com -

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