Re: Transport name resolution

[Guy Harris <guy () alum mit edu>]

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        1) look in /etc/services, which is probably based on a (possibly-out-of-date) version of, err, umm, the IANA 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(possibly-out-of-date) version of, err, umm, the IANA port list.

On Windows, I don't know what it ends up doing, but I wouldn't be surprised if it were to look in a file that's based 
on a (possibly-out-of-date) version of, err, umm, the IANA port list.

So I strongly doubt getservbyport() adds any value if we have our own IANA port list file.  (We probably didn't always 
have our own file, and started using getservbyport() back when we didn't.)

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