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