Sorry for the way too long delay, Iäve been away for the holidays. On 12/12/06, Colin Whittaker <[EMAIL PROTECTED]> wrote: >> You are right, it does not use /etc/hosts or nsswitch.conf (or >> /etc/host.conf)
> Hmm, seems like folks setting these things up would expect an application > that uses DNS to use them. At least a lookup in /etc/hosts if DNS fails. You are absolutely correct, the folks expect them to be used, but it is a bit too hairy for my taste. If you like to add host name resolving to the nta or sresolv, please go ahead. >> That is correct. The default domain or search domains are only used >> with sres_search(). The SIP/SIPS URI are resolved using three-phase >> algorithm explained in RFC 3263 and with sres_query() which never uses >> search domains. > It doesn't appear sres_search() is used by the NUA stack. Nope, only sres_query(). sres_search() (for initial A/AAAA-record query?) should be a drop-in replacement. > There are some problems with sres_query(), too (it abandons the search > after the initial absolute query fails). > > This seems like a bad bug. If the DNS server ever looses contact, you > basically loose all functionality until you bounce the stack. > I think I have seen this. If the DNS is not up when I start a REGISTER, I > get a 503 error. Then when DNS is up, I try to REGISTER again, the stack > never sends another DNS query and I get a 503 error. Forever. seem like a > blocker to me. :-) Hm. It looks like once a permanent error occurs, the server is not tried again. I think this is not the intention. > Do you think this something easy to fix ? Should I start digging into it ? Please go ahead. I think the algorithm selecting the server in sres_send_dns_query() and sres_next_server() should work so that 1) a query is always sent once unless if all servers have a permanent error (send returns immediately -1 for every server) 2) a query is retried only when there has been "enough time" from last dns_icmp >> There are a few open issues with using /etc/hosts or search domains. >> At which point we should use /etc/hosts (or gethostbyname())? Should >> nua or nta expand a host name in URI to a FQDN before sending it to a >> network? > I don't think the URI should be modified. If the URI is entered as just a > host, I think it is reasonable to expect that all servers will be able to > resolve that host as entered in the URI. OK. > I am using NUTAG_PROXY() and NUTAG_REGISTRAR(), which take URIs, but just > specify hosts right ? > Here is where I really expected search domains to be used. I guess NUTAG_PROXY() is a special case, and there we should try to resolve host names, too. -- Pekka.Pessi mail at nokia.com ------------------------------------------------------------------------- Take Surveys. Earn Cash. Influence the Future of IT Join SourceForge.net's Techsay panel and you'll get the chance to share your opinions on IT & business topics through brief surveys - and earn cash http://www.techsay.com/default.php?page=join.php&p=sourceforge&CID=DEVDEV _______________________________________________ Sofia-sip-devel mailing list Sofia-sip-devel@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/sofia-sip-devel
