Hi Bogdan,
you are right - when the NAPTR support will be added, I plan to cumulate all t_relayxxxx() functions in a single one like: t_relay("[proto:]host[:port]")
lack of proto or port will trigger NAPTR or SRV lookups.
Hmmh, host must be optional, too. That's the situation when you really need DNS NAPTR/DNS SRV lookup.
Any idea when first versions of NAPTR-support will be available?
Thanks, best regards --Joachim
Joachim Fabini wrote:
Hi,
Initially I intended to submit a feature request for OpenSER functionality similar to t_relay_to_udp, t_relay_to_tcp but WITHOUT the need to specify the destination IP address and port. My reasoning was to let the new functions do exactly what t_relay() does but in addition force the DNS SRV query for a specific transport (udp, tcp, or tls).
Seeing the roadmap for 1.1 I realized that NAPTR solves part of this problem. Is there already any estimation when NAPTR implementation will be available in OpenSER?
I intentionally said "part of the problem" because NAPTR delegates the decision on the transport to the destination DNS. But: our own proxy might also be required to control the selected transport. It seems to me quite flexible to implement a proxy-hosted NAPTR emulation and specify the list of requested protocols, e.g. t_relay_to_transport("tls","tcp",0) specifies that t_relay should firstly generate a SRV DNS query for _sips._tcp.mydomain.org, if this fails to query for _sip._tcp.mydomain.org and then give up - if I don't want UDP.
This saves one DNS query (NAPTR) and enables a proxy to control what protocols it uses for contacting the next hop.
Finally, I believe that the interface to t_relay_naptr() (or whatever the naptr relaying will be called) should support selection of desired protocols, e.g. t_relay_to_naptr("tls", "tcp", "udp") where entries can be left empty to indicate that this transport is not desired. The argument order might even overrule the NAPTR response transport ranking - finally we connect and thus decide on what transport we prefer... ;)
Any comments warmly welcome, best regards --Joachim
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