forwarding.sh

OpenSSH 是 SSH （Secure SHell） 协议的免费开源实现。它用安全、加密的网络连接工具代替了 telnet、ftp、 rlogin、rsh 和 rcp 工具。OpenSSH 支持

#	$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_sshd

base=33
last=$PORT
fwd=""
for j in 0 1 2; do
	for i in 0 1 2; do
		a=$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
	done
done
for 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 10
done