fix to make rexd more secure

[John Bowe]

Here is a fix to rexd.c to do some security checking.  When rexd gets a
request, it finds the IP address of the requester.  The addition I made is
to find its host name and look it up in /etc/hosts.equiv.  It essentially
makes rexd as secure as rshd.

This is for OS3.x sources.  Does anyone have a fix for OS4?  We don't
have OS4 src.
 
Ed's Note: Fixes placed in archives.
 
FTP:	Hostname : titan.rice.edu (128.42.30.1)
	Directory: sun-source
	Filename : rexd.c.fixes

Archive Server Address: archive-server at rice.edu
Archive Server Command: send sun-source rexd.c.fixes
 
	John Bowe	<jbowe at bbn.com>