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+?RCS: $Id: d_hidnet.U,v 3.0 1993/08/18 12:06:20 ram Exp $
+?RCS: Copyright (c) 1991-1993, Raphael Manfredi
+?RCS: You may redistribute only under the terms of the Artistic Licence,
+?RCS: as specified in the README file that comes with the distribution.
+?RCS: You may reuse parts of this distribution only within the terms of
+?RCS: that same Artistic Licence; a copy of which may be found at the root
+?RCS: of the source tree for dist 3.0.
+?RCS: $Log: d_hidnet.U,v $
+?RCS: Revision 3.0 1993/08/18 12:06:20 ram
+?RCS: Baseline for dist 3.0 netwide release.
+?MAKE:d_hidnet hiddennet: cat sed myhostname mydomain Myread Oldconfig
+?MAKE: -pick add $@ %<
+?S: This variable conditionally defines the symbol HIDDEN_NET, which
+?S: tells the C program that it should pretend it is on a different
+?S: host for purposes of advertising a mailing address.
+?S: This variable contains the value eventually given to the symbol
+?S: HIDDEN_NET, if d_hidnet defines it. If defined, it's the name
+?S: of the host which serves as the mail server for a network that
+?S: is invisible to the outside world.
+?C: This symbol, if defined, contains the host name that you want to
+?C: advertise to the outside world. This name can be different from
+?C: your actual host name, as long as the machine you specify knows
+?C: how to forward mail to you.
+?H:#$d_hidnet HIDDEN_NET "$hiddennet" /**/
+: now get the host name to advertise as our mailing address
+case "$hiddennet" in
+Some sites are on "hidden" networks, in the sense that the network appears
+to the outside world as a single machine. The advertised name of any host
+on this hidden network is the name of one machine on the local network which
+knows how to forward mail to any other host on the hidden network.
+Do you wish to advertise a different hostname to the world than the one your
+own host ($myhostname$mydomain) has?
+rp='Use "hidden" network?'
+case "$ans" in
+n*) d_hidnet="$undef" hiddennet='';;
+ echo " "
+ case "$hiddennet" in
+ '') dflt=`echo $mydomain | $sed -e 's/^\.//'`;;
+ *) dflt="$hiddennet";;
+ rp='What hostname do you wish to advertise?'
+ . ./myread