[sr-dev] Header parsing/processing problem

[Daniel-Constantin Mierla]

Hello,

headers are parsed as needed -- the core has an incremental sip parser. 
By default ony few are parsed (like: call-id, csec, to, top via).

Some of the well known headers have internal flags, so parsing to locate 
them would be like (example for Authorization and Proxy-Authorization):

parse_headers(msg, HDR_PROXYAUTH_F|HDR_AUTHORIZATION_F, 0)

If this function does not return error, then you can get these headers 
via their hooks in the sip_msg_t or iterating through headers list.

If you look for undefined header, you have to parse to the end of 
headers with:

     if(parse_headers(msg, HDR_EOH_F, 0)<0)
     {
         LM_ERR("error parsing headers\n");
         return -1;
     }

Then you iterate through headers and find it by name if it is actually 
in the message.

The parser does caching, so when parsing to locate a header, all the 
headers found before it are added to the list. For example, calling 
second time parse_headers(msg, HDR_EOH_F, 0) does pretty much nothing, 
as sip_msg_t keeps a flag that message was already parsed to the last 
header.

Cheers,
Daniel

On 10/25/12 8:58 PM, Peter Dunkley wrote:
> Hi,
>
> When adding the oma.xcap-directory auid support to xcap_server I 
> couldn't get the following bit of code (in 
> xcap_server.c:xcaps_get_directory()) to work:
>
>       while (hdr != NULL)
>         {
>                 if (cmp_hdrname_strzn(&hdr->name, "Host", 4) == 0)
>                 {
>                         server_name = hdr->body;
>                         break;
>                 }
>                 hdr = hdr->next;
>         }
>
> The host header was never found.  However, simply putting 
> 'xdbg("$hdr(Host)\n");' in event_route[xhttp:request] made it start 
> working.
>
> Have I missed something in the code, or is this a bug?
>
> Regards,
>
> Peter
>
>
> -- 
> Peter Dunkley
> Technical Director
> Crocodile RCS Ltd
>
>
>
> _______________________________________________
> sr-dev mailing list
> sr-dev at lists.sip-router.org
> http://lists.sip-router.org/cgi-bin/mailman/listinfo/sr-dev

-- 
Daniel-Constantin Mierla - http://www.asipto.com
http://twitter.com/#!/miconda - http://www.linkedin.com/in/miconda
Kamailio Advanced Training, Berlin, Nov 5-8, 2012 - http://asipto.com/u/kat
Kamailio Advanced Training, Miami, USA, Nov 12-14, 2012 - http://asipto.com/u/katu

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