Re: [9fans] /net like file trees and scripting.

["Russ Cox" <rsc@plan9.bell-labs.com>]

here's rlogin.

#!/bin/rc
# produce a zero byte on stdout
fn zero {
	dd -if /dev/zero -count 1 -bs 1 >[2]/dev/null
}

# translate a network address
fn cslookup {
	echo $1 | ndb/csquery >[2]/dev/null |tr -d '>'
}

# translate the network address for rlogin
x=`{cslookup net!$1!login}
if(~ $#x 0){
	echo couldn''t translate $1
	exit 'unknown host'
}
clonefile=$x(1)
dialstring=$x(2)

# hold the clone file open to keep the connection ours
<[4] $clonefile {
	netdir=`{basename -d $clonefile} ^ / ^  `{cat /fd/4}

	# write connect string to /net/tcp/N/ctl
	echo connect $dialstring >$netdir/ctl || exit 'cannot connect'

	# proxy data from remote system
	cat $netdir/data | tr -d '' &

	# must do bsd authentication protocol at beginning.
	{
		zero
	&&	echo -n $user	# local user
	&&	zero
	&&	echo -n $user	# remote user
	&&	zero
	&&	echo -n p9	# terminal type
	&&	zero
	} >$netdir/data || exit 'cannot talk bsd'

	# proxy data to remote system from keyboard
	# hold /dev/cons open to keep raw mode on
	</dev/cons >/dev/consctl {
		echo rawon
		cat >$netdir/data
	}
}