#	$OpenBSD: forwarding.sh,v 1.4 2002/03/15 13:08:56 markus Exp $#	Placed in the Public Domain.tid="local and remote forwarding"DATA=/bin/ls${EXEEXT}start_sshdbase=33last=$PORTfwd=""for j in 0 1 2; do	for i in 0 1 2; do		a=$base$j$i		b=`expr $a + 50`		c=$last		# fwd chain: $a -> $b -> $c		fwd="$fwd -L$a:127.0.0.1:$b -R$b:127.0.0.1:$c"		last=$a	donedonefor p in 1 2; do	q=`expr 3 - $p`	trace "start forwarding, fork to background"	${SSH} -$p -F $OBJ/ssh_config -f $fwd somehost sleep 10	trace "transfer over forwarded channels and check result"	${SSH} -$q -F $OBJ/ssh_config -p$last -o 'ConnectionAttempts=4' \		somehost cat $DATA > $OBJ/ls.copy	test -f $OBJ/ls.copy			|| fail "failed copy $DATA"	cmp $DATA $OBJ/ls.copy			|| fail "corrupted copy of $DATA"	sleep 10done