--- badi/public_scripts/canardien/canardien	2019/04/16 07:28:47	1.5
+++ badi/public_scripts/canardien/canardien	2023/08/06 20:06:51	1.6
@@ -1,12 +1,12 @@
 #!/bin/bash
 
-# canardien 0.0.4
-# (c) 2005-2019 under GPL by Adrian Zaugg
+# canardien 0.0.6
+# (c) 2005-2021 under GPL by Adrian Zaugg
 
 
 # canardien [<host> [<host> ...]]
 
-# canardiens pings a machine, originally ente.limmat.ch thus its name, 
+# canardiens pings a machine, originally ente.limmat.ch thus its name,
 # to determine wether she is gone diving.
 
 
@@ -38,7 +38,7 @@ ALIVE_ANSWER="is alive"
 
 # Max number of pakets to send before giving up. Time increases exponentially,
 # use a number < 7.
-RETRIES=4
+RETRIES=5
 
 # Temporary file path
 TMPDIR="/tmp"
@@ -78,46 +78,47 @@ function init() {
 	if [ -n "$*" ]; then
 		HOSTS="$*"
 	fi
+
+	# remove multiple spaces and trim
+	HOSTS="$(echo "$HOSTS" | sed -e "s/ \{1,\}/ /g" -e "s/^ //" -e "s/ $//")"
+
 	if [ -z "$HOSTS" ]; then
 		echo "Error: No host to ping." >&2
-		exit 0
+		exit 1
 	fi
 }
 
 
 # If a host responds to pings, it is considered up.
 function checkconnection() {
-	
-	while read -r HOST; do
-		unset UP
 
-		# ping host
-		PING_ANSWER="$($PING -R -B 2 -r $RETRIES -p 50 "$HOST" 2>&1)"
-		PING_ERRNUM=$?
-		if [ $PING_ERRNUM -gt 2 ]; then
-			echo "Error: Got error $PING_ERRNUM from fping $(head -1 "$PING_ANSWER"). Disregarding $HOST." >&2
-			continue;
-		fi
+	unset UP
 
-		# parse answer
-		if [ $(echo "$PING_ANSWER" | grep -c "$ALIVE_ANSWER") -gt 0 ]; then
-			UP=true
+	# ping host
+	PING_ANSWER="$($PING -R -B 2 -r $RETRIES -p 50 "$HOST" 2>&1)"
+	PING_ERRNUM=$?
+	if [ $PING_ERRNUM -gt 2 ]; then
+		echo "Error: Got error $PING_ERRNUM from fping $(head -1 "$PING_ANSWER"). Disregarding $HOST." >&2
+		continue;
+	fi
+
+	# parse answer
+	if [ $(echo "$PING_ANSWER" | grep -c "$ALIVE_ANSWER") -gt 0 ]; then
+		UP=true
+	fi
+	TIME_STAMP="$(date +"%a %e.%m.%y %H:%M:%S")"
+	if [ -n "$UP" ]; then
+		if [ ! "$DEBUG" = "low" ] && [ -n "$DEBUG"  ]; then
+			shout "The connection to $HOST is up."
 		fi
-		TIME_STAMP="$(date +"%a %e.%m.%y %H:%M:%S")"
-		if [ -n "$UP" ]; then
-			if [ ! "$DEBUG" = "low" ] && [ -n "$DEBUG"  ]; then
-				shout "The connection to $HOST is up."
-			fi
-		else 
-			if [ -n "$DEBUG" ]; then
-				shout "The connection to $HOST is down."
-			fi
+	else
+		if [ -n "$DEBUG" ]; then
+			shout "The connection to $HOST is down."
 		fi
-		
-		# remember a hosts state
-		rememberstate
-		
-	done <<< "$(echo "$HOSTS" | tr ' ' '\n')"
+	fi
+
+	# remember a hosts state
+	rememberstate
 }
 
 
@@ -125,7 +126,7 @@ function checkconnection() {
 function rememberstate() {
 	# Put a simple time stamp in a tmp file, when host is detected as down for the first time
 	if [ -z "$UP" ]; then
-		if [ ! -e "$TMPDIR/.canardien-$PINGHOST-$HOST" ]; then 
+		if [ ! -e "$TMPDIR/.canardien-$PINGHOST-$HOST" ]; then
 				# set time stamp
 				echo -ne "$TIME_STAMP" > "$TMPDIR/.canardien-$PINGHOST-$HOST"
 				# send alert
@@ -133,19 +134,19 @@ function rememberstate() {
 			elif [ -n "$DEBUG" ]; then
 				shout "Down since `cat $TMPDIR/.canardien-$PINGHOST-$HOST`."
 			fi
-	else 
+	else
 	  # Host is up
 		if [ -e "$TMPDIR/.canardien-$PINGHOST-$HOST" ]; then
 			if [ -n "$DEBUG" ]; then
 				shout "$HOST is up again."
 			fi
-		  # send alert
-			 ALERT_SUBJECT='"The host $HOST answers again!"'
-			 ALERT_TEXT='"[$(date +"%a %e.%m.%y %H:%M:%S")]\n\n\n$HOST is up again.\n--------------------------------------\n(downtime began $(cat "$TMPDIR/.canardien-$PINGHOST-$HOST"))\n\n\n		Kind regards, $PINGHOST."'
-			 sendalert
+			# send alert
+			ALERT_SUBJECT='"The host $HOST answers again!"'
+			ALERT_TEXT='"[$(date +"%a %e.%m.%y %H:%M:%S")]\n\n\n$HOST is up again.\n--------------------------------------\n(downtime began $(cat "$TMPDIR/.canardien-$PINGHOST-$HOST"))\n\n\n		Kind regards, $PINGHOST."'
+			sendalert
 			# delete tmp file
 			rm "$TMPDIR/.canardien-$PINGHOST-$HOST"
-		else 
+		else
 			# still running
 			if [ ! "$DEBUG" = "low" ] && [ -n "$DEBUG"  ]; then
 				shout "$HOST is up."
@@ -181,5 +182,23 @@ function shout() {
 # -----------main-----------
 
 init "$*"
-checkconnection
+
+# call an instance for each host, when multiple hosts are given
+if [[ "$HOSTS" =~ " " ]]; then
+	while read -r HOST; do
+		"$0" "$HOST" &
+	done <<< "$(echo "$HOSTS" | tr ' ' '\n')"
+	exit 0
+else
+	# process a single host
+	HOST="$HOSTS"
+	checkconnection
+fi
+
 exit 0
+
+# todo: Switches ( -q, --debug, ...)
+#	grace period: do not send a mail if down time shorter than X minutes
+#	repeat down info after x hours
+#	test port instead of ping or in addition
+