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# $OpenBSD: dynamic-forward.sh,v 1.12 2017/04/30 23:34:55 djm Exp $
# Placed in the Public Domain.
tid="dynamic forwarding"
FWDPORT=`expr $PORT + 1`
if have_prog nc && nc -h 2>&1 | grep "proxy address" >/dev/null; then
proxycmd="nc -x 127.0.0.1:$FWDPORT -X"
elif have_prog 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 p in ${SSH_PROTOCOLS}; do
n=0
error="1"
trace "start dynamic forwarding, fork to background"
while [ "$error" -ne 0 -a "$n" -lt 3 ]; do
n=`expr $n + 1`
${SSH} -$p -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 proto $p attempt $n err $error"
sleep $n
fi
done
if [ "$error" -ne 0 ]; then
fatal "failed to start dynamic forwarding proto $p"
fi
for s in 4 5; do
for h in 127.0.0.1 localhost; do
trace "testing ssh protocol $p socks version $s host $h"
${SSH} -F $OBJ/ssh_config \
-o "ProxyCommand ${proxycmd}${s} $h $PORT" \
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"
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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