ibrdtnd: add new package

This package contains the daemon (dtnd) of IBR-DTN, a modular and lightweight
implementation of the bundle protocol (RFC 5050). https://github.com/ibrdtn/ibrdtn

Signed-off-by: Johannes Morgenroth <morgenroth@ibr.cs.tu-bs.de>

net/ibrdtnd/files/safety-wrapper.sh

@@ -0,0 +1,172 @@
+#!/bin/sh
+#
+# safety wrapper for IBR-DTN daemon
+#
+# Tasks:
+#  * start IBR-DTN daemon
+#  * restart the daemon after a crash
+#  * if respawning to fast, then slow down with backoff
+#  * check for enough space on disk and delete bundles if necessary.
+#  * clean the blob directory on startup
+#
+
+DTND=/usr/sbin/dtnd
+TMPCONF=/tmp/ibrdtn.config
+UCI=/sbin/uci
+
+getstate() {
+	$UCI -P/var/state -q get ibrdtn.$1
+	return $?
+}
+
+setstate() {
+	$UCI -P/var/state -q set ibrdtn.$1=$2
+	return $?
+}
+
+getconfig() {
+	$UCI -q get ibrdtn.$1
+	return $?
+}
+
+setconfig() {
+	$UCI -q set ibrdtn.$1=$2
+	return $?
+}
+
+# remove the old state file
+/bin/rm /var/state/ibrdtn
+
+# read uci configuration
+BLOB_PATH=`getconfig storage.blobs`
+BUNDLE_PATH=`getconfig storage.bundles`
+CONTAINER_PATH=`getconfig storage.path`
+CONTAINER_FILE=`getconfig storage.container`
+LOG_FILE=`getconfig main.logfile`
+ERR_FILE=`getconfig main.errfile`
+DEBUG_LEVEL=`getconfig main.debug`
+SAFEMODE=no
+
+# run a system check
+/bin/sh /usr/share/ibrdtn/systemcheck.sh
+
+if [ $? -eq 0 ]; then
+	# mount container if specified
+	if [ -n "$CONTAINER_FILE" ] && [ -n "$CONTAINER_PATH" ]; then
+		/bin/sh /usr/share/ibrdtn/mountcontainer.sh
+
+		# if the mount of the container failed
+		# switch to safe mode!
+		if [ $? -gt 0 ]; then
+			SAFEMODE=yes
+		fi
+	fi
+else
+	SAFEMODE=yes
+fi
+
+# create blob & bundle path
+if [ -n "$BLOB_PATH" ]; then
+	/bin/mkdir -p $BLOB_PATH
+
+	# clean the blob directory on startup
+	/bin/rm -f $BLOB_PATH/file*
+fi
+
+if [ -n "$BUNDLE_PATH" ]; then
+	/bin/mkdir -p $BUNDLE_PATH
+fi
+
+LOGGING=""
+if [ -n "$LOG_FILE" ]; then
+	LOGGING="$LOGGING > $LOG_FILE"
+else
+	LOGGING="$LOGGING > /dev/null"
+fi
+
+if [ -n "$ERR_FILE" ]; then
+	LOGGING="$LOGGING 2> $ERR_FILE"
+else
+	LOGGING="$LOGGING 2> /dev/null"
+fi
+
+if [ -z "$LOG_FILE" ] && [ -z "$ERR_FILE" ]; then
+	LOGGING="-q"
+fi
+
+# check for debugging option
+if [ -n "$DEBUG_LEVEL" ]; then
+	DEBUG_ARGS="-v -d ${DEBUG_LEVEL}"
+else
+	DEBUG_ARGS=""
+fi
+
+# create configuration
+if [ "$SAFEMODE" == "yes" ]; then
+	/bin/sh /usr/share/ibrdtn/build-config.sh --safe-mode $TMPCONF
+else
+	/bin/sh /usr/share/ibrdtn/build-config.sh $TMPCONF
+fi
+
+# set the crash counter to zero
+CRASH=0
+
+# run the daemon
+setstate state running
+
+while [ "`getstate state`" == "running" ]; do
+	# run a system check
+	/bin/sh /usr/share/ibrdtn/systemcheck.sh
+
+	# run in safe mode if the system check has failed
+	if [ $? -gt 0 ] && [ "$SAFEMODE" == "no" ]; then
+		SAFEMODE=yes
+		/usr/bin/logger -t "ibrdtn-safe-wrapper" -p 2 "system check failed! Switch to safe-mode settings."
+		/bin/sh /usr/share/ibrdtn/build-config.sh --safe-mode $TMPCONF
+	fi
+
+	# measure the running time
+	TIMESTART=`/bin/date +%s`
+	
+	# run the daemon
+	echo "${DTND} ${DEBUG_ARGS} -c ${TMPCONF} ${LOGGING}" | /bin/sh
+	
+	# measure the stopping time
+	TIMESTOP=`/bin/date +%s`
+	
+	# calc the running time
+	let TIMERUN=$TIMESTOP-$TIMESTART
+	
+	# reset the CRASH counter if there is one hour between the crashes
+	if [ $TIMERUN -ge 3600 ]; then
+		CRASH=0
+	fi
+	
+	# check if the daemon is crashed
+	if [ "`getstate state`" == "running" ]; then
+		# if the crash counter is higher than 20 switch to safe-mode settings
+		if [ $CRASH -eq 20 ] && [ "$SAFEMODE" == "no" ]; then
+			SAFEMODE=yes
+			/usr/bin/logger -t "ibrdtn-safe-wrapper" -p 2 "IBR-DTN daemon crashed 20 times! Switch to safe-mode settings."
+			/bin/sh /usr/share/ibrdtn/build-config.sh --safe-mode $TMPCONF
+		fi
+
+		# increment the crash counter
+		let CRASH=$CRASH+1
+		
+		# backoff wait timer
+		let WAIT=2**$CRASH
+		
+		# set a upper limit for the wait time
+		if [ $WAIT -ge 1800 ]; then
+			WAIT=1800
+		fi
+
+		# log the crash
+		/usr/bin/logger -t "ibrdtn-safe-wrapper" -p 2 "IBR-DTN daemon crashed $CRASH times! Wait $WAIT seconds."
+		
+		# wait sometime
+		/bin/sleep $WAIT
+	fi
+done
+