[OpenSER-Devel] [ openser-Feature Requests-1793928 ] [rr] louse_roote() should import domains from domain module

Wed Nov 14 08:37:26 UTC 2007

Feature Requests item #1793928, was opened at 2007-09-13 16:56
Message generated for change (Comment added) made by bogdan_iancu
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Category: modules
Group: ver devel
Status: Open
Resolution: Postponed
Priority: 7
Private: No
Submitted By: Iñaki Baz (ibc_sf)
Assigned to: Bogdan (bogdan_iancu)
Summary: [rr] louse_roote() should import domains from domain module

Initial Comment:
In the loose_route() documentatión there is:
"There is only one exception: If the request is out-of-dialog (no to-tag) and there is only one Route: header indicating the local proxy, then the Route: header is removed and the function returns FALSE."

The problem is that the URI domain is not matched with domains of "domain" module.

This causes a problem in SIP devices which include a "Route" header in REGISTER, so it produces an infinite loop in OpenSer if there is not "alias=URI_domain" or if URI_domain doesn't appear in /etc/hosts.

Obviosly, if I work with domain modules I just want to store domains in "domain" table, and not to add them manually in openser.cfg as "alias" or in /etc/hosts.

Could "loose_route()" consult domain module entries in order to know if the URI is local or not?

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>Comment By: Bogdan (bogdan_iancu)
Date: 2007-11-14 10:37

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Dan, that is exactly what I was going for. I keep the current behaviour of
not doing DNS lookup to match the Route URI, but use only the "aliases"
list.
The idea is to extend the alias support to allow a module to register
additional aliases (except the ones from script).

Regards,
Bogdan

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Comment By: Dan (dan_pascu)
Date: 2007-11-13 22:36

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I do not think that we need to use DNS lookups on every loose_route call.
That would be very costly and unnecessary IMO. All we have to do is to
check the domains from the domains table in adition to aliases and local
IPs, because those domains are local to openser.

Otherwise it would require a SRV and/or A record lookup to determine if it
points to one of the proxy's IPs.

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Comment By: Bogdan (bogdan_iancu)
Date: 2007-11-13 20:08

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Hi,

In openser, to check if the domain is local or not is not done by
resolving via DNS to see if you end up to one of your IPs. How is done -
openser checks the domain against a list of know local domains. It is done
like this mainly because is faster and not in all the cases there is a
relation (as DNS) between the IP you use and the local SIP domain.

As the RFC makes possible the usage of names in Route (preloade route),
than we need to take this into account.

I will re-clasify this as a Feature request, rather than a bug in openser.
I would call it a bug in RFC :D...

Regards,
Bogdan

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Comment By: Iñaki Baz (ibc_sf)
Date: 2007-11-04 02:56

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Sorry but I reopen again this report.

In RFC 3261 into "16 Proxy Behavior" section we can read (page 102):

   "The URI placed in the Record-Route header field MUST resolve to
    the element inserting it (or a suitable stand-in) when the
    server location procedures of [4] are applied to it, so that
    subsequent requests reach the same SIP element."

And [4] refers to: "SIP: Locating SIP Servers" RFC 3263.

That means the "Route" header URI can be a hostname or a domain and it can
envolve a DNS query (SRV and A type).

Maybe I've understood wrongly the text above, but if not, shouldn't
"louse_roote()" do a DNS query for URI in "Route" header?

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Comment By: Iñaki Baz (ibc_sf)
Date: 2007-10-02 19:27

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In SIP_Forum's SIPconnect program to get SIP compliant devices and
services we can read:

"SIP Proxy Servers MUST use canonical hostnames in any 'Via:' and/or
'Route:' SIP header field that it inserts in the SIP message.":

http://www.zoomerang.com/web/SharedResults/SharedResultsSurveyResultsPage.aspx?ID=L234XRLBNYYH
(point 15)

So if that is true then OpenSer behaviour is correct and there is a bug in
oSIP stack because it shouldn't add a "Route" header with SIP domain value
in REGISTER messages.

Maybe this report could be closed then?

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Comment By: Klaus Darilion (klaus_darilion)
Date: 2007-09-13 17:43

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Are you sure? I think the rules for finding the IP address of the SIP URI
in the Route header is RFC 3263.

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Comment By: Nobody/Anonymous (nobody)
Date: 2007-09-13 17:35

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this request is invalid.  route header contains hostnames or host
addresses, not domains.

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