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tid="local and remote forwarding"
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 /bin/ls > $OBJ/ls.copy
test -f $OBJ/ls.copy || fail "failed copy /bin/ls"
cmp /bin/ls $OBJ/ls.copy || fail "corrupted copy of /bin/ls"
sleep 10
done
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