1# $OpenBSD: dynamic-forward.sh,v 1.10 2013/05/17 04:29:14 dtucker 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 $proxycmd" 17 18start_sshd 19 20for p in 1 2; do 21 n=0 22 error="1" 23 trace "start dynamic forwarding, fork to background" 24 while [ "$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