dynamic-forward.sh revision 295367 
1#	$OpenBSD: dynamic-forward.sh,v 1.11 2015/03/03 22:35:19 markus Exp $
2#	Placed in the Public Domain.
3
4tid="dynamic forwarding"
5
6FWDPORT=`expr $PORT + 1`
7
8if have_prog nc && nc -h 2>&1 | grep "proxy address" >/dev/null; then
9	proxycmd="nc -x 127.0.0.1:$FWDPORT -X"
10elif have_prog connect; then
11	proxycmd="connect -S 127.0.0.1:$FWDPORT -"
12else
13	echo "skipped (no suitable ProxyCommand found)"
14	exit 0
15fi
16trace "will use ProxyCommand $proxycmd"
17
18start_sshd
19
20for p in ${SSH_PROTOCOLS}; do
21	n=0
22	error="1"
23	trace "start dynamic forwarding, fork to background"
24	while [ "$error" -ne 0 -a "$n" -lt 3 ]; do
25		n=`expr $n + 1`
26		${SSH} -$p -F $OBJ/ssh_config -f -D $FWDPORT -q \
27		    -oExitOnForwardFailure=yes somehost exec sh -c \
28			\'"echo \$\$ > $OBJ/remote_pid; exec sleep 444"\'
29		error=$?
30		if [ "$error" -ne 0 ]; then
31			trace "forward failed proto $p attempt $n err $error"
32			sleep $n
33		fi
34	done
35	if [ "$error" -ne 0 ]; then
36		fatal "failed to start dynamic forwarding proto $p"
37	fi
38
39	for s in 4 5; do
40	    for h in 127.0.0.1 localhost; do
41		trace "testing ssh protocol $p socks version $s host $h"
42		${SSH} -F $OBJ/ssh_config \
43			-o "ProxyCommand ${proxycmd}${s} $h $PORT" \
44			somehost cat $DATA > $OBJ/ls.copy
45		test -f $OBJ/ls.copy	 || fail "failed copy $DATA"
46		cmp $DATA $OBJ/ls.copy || fail "corrupted copy of $DATA"
47	    done
48	done
49
50	if [ -f $OBJ/remote_pid ]; then
51		remote=`cat $OBJ/remote_pid`
52		trace "terminate remote shell, pid $remote"
53		if [ $remote -gt 1 ]; then
54			kill -HUP $remote
55		fi
56	else
57		fail "no pid file: $OBJ/remote_pid"
58	fi
59done
60