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From: karrer@bernina.ethz.ch (Andreas Karrer)
Newsgroups: comp.protocols.tcp-ip.domains
Subject: Sun's "rcp" does not use resolver
Message-ID: <1991Apr7.114340.3310@bernina.ethz.ch>
Date: 7 Apr 91 11:43:40 GMT
Organization: Swiss Federal Institute of Technology (ETH), Zurich, CH
Lines: 22

On my sun, I recently build a new shared libc.so that does hostname lookup by
first searching /etc/hosts and then asking the DNS. I believe this is the
Right Thing to do because:
 - you have hosts like "localhost" in /etc/hosts where they should be;
 - you don't do high-level protocol conversion as with the "B=-b" kludge.

Almost everything (ping/telnet/rsh/rlogin/ftp etc) works fine EXCEPT rcp.

Reason:
	% file /usr/ucb/rcp /usr/ucb/rsh
	/usr/ucb/rcp:   sparc demand paged set-uid executable
	/usr/ucb/rsh:   sparc pure dynamically linked set-uid executable

oops - rcp does not use /usr/lib/libc.so.n.n.n... And I was beginning
to hope we could throw away the hosts.* NIS maps...

Is there any (security?) reason for rcp NOT being dynamically linked?
Ok, rcp is setuid root, but then, so are rsh and rlogin.

+-----------
  Andi Karrer, Communication Systems, ETH Zuerich, Switzerland
  karrer@bernina.ethz.ch