This is a implementation of getnetby{addr,name}() and {set,end}hostent()
that uses the DNS (RFC1101).
We have moved the old versions of getnetby{addr,name}() and
{set,end}hostent() to _getnetby{addr,name}() and _{set,end}hostent().
Our implementation querys the DNS and falls back to the old functions in
the case of a negative reply. This is done since, at this moment, few people
have entered this information in the DNS.
Because of this we have modified the {set,end}netent() functions so now
they turn on or off the resolver options "RES_STAYOPEN | RES_USEVC"
(by calling {set,end}hostent() ) AND open the /etc/networks .
We have made a test program (called nettest) that looks for information
on a network passed in the command line (either by name or by number).
gnu% ./nettest 192.138.204
Official name: net.mat.uc.pt
Net addr. type: 2
Network : 12618444 ----> 192.138.204
Aliases :
gnu% ./nettest 192.138.204.0
Official name: net.mat.uc.pt
Net addr. type: 2
Network : 3230321664 ----> 192.138.204.0
Aliases :
gnu% ./nettest net.mat.uc.pt.
Official name: net.mat.uc.pt
Net addr. type: 2
Network : 12618444 ----> 192.138.204
Aliases :
gnu% ./nettest mat.uc.pt
Official name: mat.uc.pt
Net addr. type: 2
Network : 12618444 ----> 192.138.204
Aliases :
The program nettest.local uses the functions in libresolv, that usually
read /etc/networks.
The Makefile included can also recompile netstat (if you have the
source to netstat) using these functions.
At this moment this netstat (option -r) is very slow.
It will be better when named caches negative replys and/or
more people enter this information in the DNS.
This has been tested in BSD/386 (0.9.4), in SunOS (4.0.3 and 4.1.3)
and Ultrix 4.2.
NOTE: These versions never use yellow pages (NIS).
Authors:
Carlos Leandro leandro@mat.uc.pt
Rui Salgueiro rps@mat.uc.pt
Send bugs reports, bug fixes, suggestions, etc... to rfc1101@mat.uc.pt.
These are the contents of the former NiCE NeXT User Group NeXTSTEP/OpenStep software archive, currently hosted by Netfuture.ch.