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
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-- 
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