Re: Internet Worm

[jim () Tadpole COM (jim () Tadpole COM)]

Sun (at least in SunOS 4) didn't do any "mucking about" with
libresolv and YP in libc.  ypserv(e) is responsible for 
consulting the DNS, if the NIS maps  (host.byname/byaddr) are
setup with a special key/value pair.  Things are different in
Solaris.

The resolv+ package shows exactly how to replace routines in
the libc.so/sa files such that the gethostbyname()/gethostbyaddr()
lookups happen via the DNS (or NIS, or just the /etc/host file, it
depends on how you configure things).  Similar things could be done
for any routine in libc, or any other shared library, for that matter.

[Unfortunately, 'rcp' and everything in /sbin (SunOS 4 again) are staticly
linked, so if 'rcp' is important to you and you want to use the resolv+
functionality, you'll have to find the BSD source and build a copy for
yourself.]

Replacing ruserok() and friends should be trivial.

Jim