Re: Transport name resolution

[Jeff Morriss <jeff.morriss.ws () gmail com>]

On 09/16/13 14:57, Guy Harris wrote:
> On Sep 16, 2013, at 7:20 AM, Anders Broman <anders.broman () ericsson com> wrote:
>
> > In serv_name_lookup() we call getservbyport() for ports not resolved in the IANA port list the function
> > Seems quite expensive so my question is does it add any value or can I remove it?
>
> At least on UN*Xes, getservbyport() does one or more of:
>
>         1) look in /etc/services, which is probably based on a (possibly-out-of-date) version of, err, umm, the IANA 
> port list;
>
>         2) query some network service to do a lookup - and that service is probably using its own database, based on a 
> (possibly-out-of-date) version of, err, umm, the IANA port list.

... possibly with some modifications for local use.  But I imagine the 
number of people who actually go through the trouble to run a customized 
service database to be sufficiently few that it's not worth slowing 
everyone else down for.

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