[han.holl@pobox.com] libc/1172: rresvport should avoid well known ports

[Han Holl]

Andreas Jaeger wrote:
> 
> >>>>> Thorsten Kukuk writes:
> 
> Thorsten> On Fri, Jun 25, Andreas Jaeger wrote:
> 
> >> Check RFC1700, the ports are reserved until 1023 - and there're some
> >> well known programs in the range like kerberos,syslog,talk.
> 
> Thorsten> Stupid. 512-1023 are used on all Unix for dynamically
> Thorsten> assigned privileged ports.  If IANA uses them all for fixed
> Thorsten> programs, what should we do with RPC ?  This means, it is
> Thorsten> impossible to set up a "secure" NIS server or to make
> Thorsten> "secure" queries, means queries from a port less 1023.
> 
> I agree.  That's the problem - so what can we do?  I wouldn't call
> myself a network expert and therefore count on your opinions.
> 

Thorsten,

Is there anything very wrong with my earlier suggestion to use
getservbyport() ?

A system administrator could decide to edit in/out the ports (s)he
wants reserved for well known daemons/ free for dynamic assignment.

Am I missing something here ?

Han Holl