2009/2/26 Fabio Margarido <fabiomargar...@gmail.com>:
> I'd like to know what's the best way to check if a header is present (and
> get its contents) in a sip_t (or msg_t) structure by name (as a string) or
> if there is a way to loop through all the headers in a sip_t structure,
> checking if each one's name matches an arbitrary string the user of my
> application has passed and get the contents of the headers in case there is
> a match.
You can get msg_href_t by name with msg_find_hclass(), like
msg_href_t *href = msg_find_hclass(msg_mclass(msg), name, NULL);
msg_header_t **slot = (char *)sip + href->hr_offset;
if (href->hr_class->hc_name[0]) {
/* Well-known header */
}
else {
/* Unknown header */
}
The header contents (including its name) are in (*slot)->sh_data,
lenght in (*slot)->sh_len. In order to gain access to the unparsed
contents, you have to add NTATAG_SIP_FLAGS(MSG_FLG_EXTRACT_COPY) when
calling nua_create() or nta_agent_create()).
Alternatively, you can convert the header field to string with
sip_header_as_string(). Header field is usually a thing that you can
put on separate headers or on a a single header separated with commas.
E.g., header
Contact: <sip:192.168.1.100>, <sip:fec0::1>
contains two header fields and it could be represented as two headers
Contact: <sip:192.168.1.100>
Contact: <sip:fec0::1>
The (*slot)->sh_next pointer will contain the next header field or
next header with the same name.
The authentication headers are an exception in SIP, there the header
field contains all the comma-separated values from a single header.
Sofia SIP makes another exception for so called list headers where the
header field consists of single token, so if the original message
contains headers
Require: 100rel
Require: timer
the 100rel and timer are collected in a single list (on
sip->sip_require->k_items[] array) and they are returned in a single
call to sip_header_as_string().
If you want to make your application bomb-proof, you probably have to
go through the list of bad headers in sip->sip_error, too.
--
Pekka.Pessi mail at nokia.com
------------------------------------------------------------------------------
Open Source Business Conference (OSBC), March 24-25, 2009, San Francisco, CA
-OSBC tackles the biggest issue in open source: Open Sourcing the Enterprise
-Strategies to boost innovation and cut costs with open source participation
-Receive a $600 discount off the registration fee with the source code: SFAD
http://p.sf.net/sfu/XcvMzF8H
_______________________________________________
Sofia-sip-devel mailing list
Sofia-sip-devel@lists.sourceforge.net
https://lists.sourceforge.net/lists/listinfo/sofia-sip-devel
