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[BackupPC-users] Solved: rsyncd via ssh-redirected port
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From: Guido S. <gs...@sc...> - 2010-01-16 14:59:24
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Guido Schmidt schrieb: > I'm now trying to backup a public host (host.example.com) via an ssh-redirected port. I don't allow any command execution on that host (and therefore cannot use the wait command), so I wrote a script (sshtunnelcontrol, see below) to open and close the tunnel when needed. It is called as DumpPreUserCmd and DumpPostUserCmd. > > What works? The opening and closing of the tunnel. > What does not? The connection to it. Nothing in the rsyncd-logs on host.example.com. > > If I leave DumpPostUserCmd empty the tunnel stays open and I can use it with rsync as user backuppc on a shell providing the password by hand: > > rsync -av --list-only --port=32323 backuppc@localhost::Alles /home/backuppc/test/ > > XferMethod is rsyncd. The problem was that BackupPC tried to connect before the tunnel was ready. Inserting sleep 3 in my tunnel-control-script solved that. In case anybody else wants to use it, here's the current version (tested only on a Linux box): -------- Begin /usr/local/bin/sshtunnelcontrol2 ---------- #!/bin/bash ### ### Provide ssh-tunnel for BackupPC ### ### by Guido Schmidt ### Version 2.2 2010/01/16 ### # Arguments BackupPC needs to provide: # 1 2 [3] [4] [5] [6] [7] [8] [9] # ACTION $client $sshPath SSH-Options local tunnelport $host rsync port ssh login ssh port # [d]start|[d]stop host.example.com /path/to/ssh -CN 11111 localhost 873 backuppc 22222 # Crude argument-handling ACTION=$1 CLIENT=$2 SSH_PATH=$3 SSH_OPTS=$4 SSH_TUNNEL_PORT=$5 SSH_HOST=$6 RSYNC_PORT=$7 SSH_USER=$8 SSH_PORT=$9 # Are we in debug-mode? case "$ACTION" in dstart) DEBUG="1" ACTION="start" ;; dstop) DEBUG="1" ACTION="stop" ;; *) esac # Base settings PRG_NAME="SSH Tunnel Control 2" RSYNC_PATH="/usr/bin/rsync" BASEDIR="/home/backuppc" PIDFILE="${BASEDIR}/sshtunnel-${CLIENT}.pid" TUNNEL_START="$SSH_PATH $SSH_OPTS -L $SSH_TUNNEL_PORT:$SSH_HOST:$RSYNC_PORT -l $SSH_USER -p $SSH_PORT $CLIENT" ### tunnel_PID () ### Check for $PIDFILE tunnel_PID () { if [ -e "${PIDFILE}" ]; then debecho "$PRG_NAME: Found ${PIDFILE}" else debecho "$PRG_NAME: ${PIDFILE} does not exist" return 1 fi } ### tunnel_proc () ### Check for process $PID tunnel_proc () { PID=`cat ${PIDFILE}` debecho "$PRG_NAME: Looking for Process $PID" if ps -ef | grep -E "^backuppc +$PID.*$CLIENT" > /dev/null ; then debecho "$PRG_NAME: Found process $PID" else debecho "$PRG_NAME: Process $PID does not exist" return 1 fi } ### rsync_connect () ### Check for connection to remote rsyncd rsync_connect () { debecho "$PRG_NAME: Trying rsync --list-only --port=$SSH_TUNNEL_PORT $SSH_USER@$SSH_HOST::" if $RSYNC_PATH --list-only --port=$SSH_TUNNEL_PORT $SSH_USER@$SSH_HOST:: ; then debecho "$PRG_NAME: Connection to remote rsyncd tested successfully" else debecho "$PRG_NAME: Connection to remote rsyncd failed" return 1 fi } ### create_tunnel () ### Open a new tunnel via SSH create_tunnel () { debecho "$PRG_NAME: Opening tunnel" debecho "$PRG_NAME: $TUNNEL_START &" $TUNNEL_START 1>/dev/null 2>/dev/null & PID=$! if [ "$PID" -gt "0" ] ; then debecho "$PRG_NAME: Process ID is $PID" if echo $PID > "${PIDFILE}" ; then debecho "$PRG_NAME: Created ${PIDFILE}" else debecho "$PRG_NAME: Error: Could not create ${PIDFILE}" return 2 fi else debecho "$PRG_NAME: Error: No Process ID" return 1 fi # wait a bit for the tunnel to get ready sleep 3 } ### destroy_tunnel () ### Close an existing tunnel destroy_tunnel () { PID=`cat ${PIDFILE}` if kill -15 $PID ; then debecho "$PRG_NAME: Process $PID killed" else debecho "$PRG_NAME: Error: Could not kill $PID" return 1 fi } ### remove_tunnel_PID () ### Remove an existing tunnel-PID-file remove_tunnel_PID () { if rm ${PIDFILE} ; then debecho "$PRG_NAME: ${PIDFILE} deleted" else debecho "$PRG_NAME: Error: Could not delete ${PIDFILE}" return 1 fi } ### debecho () ### Will echo passed parameters only if DEBUG is set to a value debecho () { if [ ! -z "$DEBUG" ]; then echo "$1" >&2 fi } case "$ACTION" in start) ### ### Action: provide tunnel ### # check for (remains of) old tunnel if tunnel_PID ; then if tunnel_proc ; then if rsync_connect ; then echo "$PRG_NAME: [$ACTION] Old tunnel still working. Nothing to do." exit 0 else if ! destroy_tunnel ; then echo "$PRG_NAME: [$ACTION] Fatal: Could not kill old tunnel-process. Aborting" exit 20 fi fi else if ! remove_tunnel_PID ; then echo "$PRG_NAME: [$ACTION] Fatal: Could not delete ${PIDFILE}. Aborting" exit 21 fi fi fi # create a new tunnel create_tunnel # check if created tunnel works as expected if tunnel_proc ; then # try to connect if rsync_connect ; then echo "$PRG_NAME: [$ACTION] Tunnel created" exit 0 else echo "$PRG_NAME: [$ACTION] Error: Tunnel not working" destroy_tunnel exit 30 fi else echo "$PRG_NAME: [$ACTION] Error: Tunnel-Process $PID not found" remove_tunnel_PID exit 31 fi ;; stop) ### ### Action: remove tunnel ### # anything to remove? if tunnel_PID ; then if tunnel_proc ; then destroy_tunnel fi remove_tunnel_PID echo "$PRG_NAME: [$ACTION] Tunnel removed" else echo "$PRG_NAME: [$ACTION] Nothing to do" fi ;; *) ### ### Action: unknown ### echo "$PRG_NAME: Usage" echo "" echo "$0 start|dstart CLIENT SSH_PATH SSH_OPTS SSH_TUNNEL_PORT SSH_HOST RSYNC_PORT SSH_USER SSH_PORT" echo "$0 stop|dstop CLIENT" echo "" echo " CLIENT: Hostname to connect to" echo " SSH_HOST: localhost" echo " SSH_USER: Username on CLIENT" echo " Debug: precede start or stop with d" exit 10 ;; esac --------- End /usr/local/bin/sshtunnelcontrol2 ----------- -- Schalloch Musikhandel GmbH Percussionsabteilung Firmensitz: Karolinenstraße 4-5, 20357 Hamburg Registergericht: Amtsgericht Hamburg, HRB 22770 Geschäftsführer: Christoph Scheffler Tel 040-43 84 94 Fax 040-430 29 47 Öffnungszeiten: Mo-Mi 10-19 Uhr Do+Fr 10-20 Uhr Sa 10-16 Uhr Sie erreichen mich: Mo 13-19 Uhr Di 10-19 Uhr Do 11-20 Uhr Jeden 2. 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