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# $OpenBSD: dynamic-forward.sh,v 1.13 2017/09/21 19:18:12 markus Exp $
# Placed in the Public Domain.
tid="dynamic forwarding"
FWDPORT=`expr $PORT + 1`
if [ -x "`which nc`" ] && nc -h 2>&1 | grep "proxy address" >/dev/null; then
proxycmd="nc -x 127.0.0.1:$FWDPORT -X"
elif [ -x "`which connect`" ]; then
proxycmd="connect -S 127.0.0.1:$FWDPORT -"
else
echo "skipped (no suitable ProxyCommand found)"
exit 0
fi
trace "will use ProxyCommand $proxycmd"
start_sshd
for d in D R; do
n=0
error="1"
trace "start dynamic forwarding, fork to background"
while [ "$error" -ne 0 -a "$n" -lt 3 ]; do
n=`expr $n + 1`
${SSH} -F $OBJ/ssh_config -f -$d $FWDPORT -q \
-oExitOnForwardFailure=yes somehost exec sh -c \
\'"echo \$\$ > $OBJ/remote_pid; exec sleep 444"\'
error=$?
if [ "$error" -ne 0 ]; then
trace "forward failed attempt $n err $error"
sleep $n
fi
done
if [ "$error" -ne 0 ]; then
fatal "failed to start dynamic forwarding"
fi
for s in 4 5; do
for h in 127.0.0.1 localhost; do
trace "testing ssh socks version $s host $h (-$d)"
${SSH} -F $OBJ/ssh_config \
-o "ProxyCommand ${proxycmd}${s} $h $PORT" \
somehost cat ${DATA} > ${COPY}
test -f ${COPY} || fail "failed copy ${DATA}"
cmp ${DATA} ${COPY} || fail "corrupted copy of ${DATA}"
done
done
if [ -f $OBJ/remote_pid ]; then
remote=`cat $OBJ/remote_pid`
trace "terminate remote shell, pid $remote"
if [ $remote -gt 1 ]; then
kill -HUP $remote
fi
else
fail "no pid file: $OBJ/remote_pid"
fi
done
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