merged most of the original code from ffac (mmalte), enhanced in

from https://github.com/rubo77/gluon-ssid-changer/tree/fix-sed

Merge remote-tracking branch 'origin/fix-sed'

README.md

@@ -6,8 +6,8 @@ This script changes the SSID when there is no connection to the selected Gateway
 Once a minute it checks if there is a gateway reacheable with `batctl gwl -H` and
 decides if a change of the SSID is necessary.
 
-*It is a simplified rewrite of https://github.com/ffac/gluon-ssid-changer that doesn't check
-the tx value any more. It is in use in Freifunk Freiburg*
+*It is a fork of https://github.com/ffac/gluon-ssid-changer that doesn't check
+the tx value any more. It will be in use in Freifunk Nord*
 
 Gluon versions
 ==============

files/lib/gluon/ssid-changer/ssid-changer.sh

@@ -4,40 +4,63 @@
 MINUTES=1440 # only once every timeframe the SSID will change to OFFLINE (set to 1 minute to change every time the router gets offline)
 OFFLINE_PREFIX='FF_OFFLINE_' # use something short to leave space for the nodename (no '~' allowed!)
 
-ONLINE_SSID=$(uci get wireless.client_radio0.ssid -q)
+ONLINE_SSID="$(uci get wireless.client_radio0.ssid -q)"
 : ${ONLINE_SSID:="FREIFUNK"} # if for whatever reason ONLINE_SSID is NULL
 
 # Generate an Offline SSID with the first and last part of the nodename to allow owner to recognise wich node is down
-NODENAME=`uname -n`
-if [ ${#NODENAME} -gt $((30 - ${#OFFLINE_PREFIX})) ] ; then # 32 would be possible as well
-  HALF=$(( (28 - ${#OFFLINE_PREFIX} ) / 2 )) # calculate the length of the first part of the node identifier in the offline-ssid
-  SKIP=$(( ${#NODENAME} - $HALF )) # jump to this charakter for the last part of the name
-  OFFLINE_SSID=$OFFLINE_PREFIX${NODENAME:0:$HALF}...${NODENAME:$SKIP:${#NODENAME}} # use the first and last part of the nodename for nodes with long name
+NODENAME="$(uname -n)"
+if [ ${#NODENAME} -gt $((30 - ${#OFFLINE_PREFIX})) ]; then # 32 would be possible as well
+	HALF=$(( (28 - ${#OFFLINE_PREFIX} ) / 2 )) # calculate the length of the first part of the node identifier in the offline-ssid
+	SKIP=$(( ${#NODENAME} - $HALF )) # jump to this charakter for the last part of the name
+	OFFLINE_SSID=$OFFLINE_PREFIX${NODENAME:0:$HALF}...${NODENAME:$SKIP:${#NODENAME}} # use the first and last part of the nodename for nodes with long name
 else
-  OFFLINE_SSID="$OFFLINE_PREFIX$NODENAME" # great! we are able to use the full nodename in the offline ssid
+	OFFLINE_SSID="$OFFLINE_PREFIX$NODENAME" # great! we are able to use the full nodename in the offline ssid
 fi
-# maximum simplyfied, no more ttvn rating
+
+# maximum simplified, no more ttvn rating
 CHECK=$(batctl gwl -H|grep -v "gateways in range"|wc -l)
-HOSTAPD=/var/run/hostapd-phy0.conf
-if [ $CHECK -eq 0 ] ; then
-  if [ $(expr $(date "+%s") / 60 % $MINUTES) -eq 0 ]; then
-    CURRENT_SSID=`grep "^ssid=$ONLINE_SSID" $HOSTAPD | cut -d"=" -f2`
-    if [ "$CURRENT_SSID" == "$OFFLINE_SSID" ]; then
-      echo "$0 - still on $OFFLINE_SSID"
-      exit 0
-    fi
-    echo "$0 change ssid to $OFFLINE_SSID" | logger
-    sed -i s~^ssid=$ONLINE_SSID~ssid=$OFFLINE_SSID~ $HOSTAPD
-    killall -HUP hostapd
-  fi
+HUP_NEEDED=0
+if [ $CHECK -gt 0 ]; then
+	echo "node is online"
+	for HOSTAPD in $(ls /var/run/hostapd-phy*); do # check status for all physical devices
+	CURRENT_SSID="$(grep "^ssid=$ONLINE_SSID" $HOSTAPD | cut -d"=" -f2)"
+	if [ "$CURRENT_SSID" == "$ONLINE_SSID" ]
+	then
+		echo "SSID $CURRENT_SSID is correct, noting to do"
+		break
+	fi
+	CURRENT_SSID="$(grep "^ssid=$OFFLINE_SSID" $HOSTAPD | cut -d"=" -f2)"
+	if [ "$CURRENT_SSID" == "$OFFLINE_SSID" ]; then
+		logger -s -t "gluon-offline-ssid" -p 5 "SSID is $CURRENT_SSID, change to $ONLINE_SSID"
+		sed -i "s~^ssid=$CURRENT_SSID~ssid=$ONLINE_SSID~" $HOSTAPD
+		HUP_NEEDED=1 # HUP here would be to early for dualband devices
+	else
+		echo "There is something wrong, did not find SSID $ONLINE_SSID or $OFFLINE_SSID"
+	fi
+done
+elif [ $CHECK -eq 0 ]; then
+	echo "node is considered offline"
+	if [ $(expr $(date "+%s") / 60 % $MINUTES) -eq 0 ]; then
+		for HOSTAPD in $(ls /var/run/hostapd-phy*); do
+  		CURRENT_SSID="$(grep "^ssid=$OFFLINE_SSID" $HOSTAPD | cut -d"=" -f2)"
+  		if [ "$CURRENT_SSID" == "$OFFLINE_SSID" ]; then
+  			echo "SSID $CURRENT_SSID is correct, noting to do"
+  			break
+  		fi
+  		CURRENT_SSID="$(grep "^ssid=$ONLINE_SSID" $HOSTAPD | cut -d"=" -f2)"
+  		if [ "$CURRENT_SSID" == "$ONLINE_SSID" ]; then
+  			logger -s -t "gluon-offline-ssid" -p 5 "SSID is $CURRENT_SSID, change to $OFFLINE_SSID"
+  			sed -i "s~^ssid=$ONLINE_SSID~ssid=$OFFLINE_SSID~" $HOSTAPD
+  			HUP_NEEDED=1
+  		else
+  			echo "There is something wrong: did neither find SSID '$ONLINE_SSID' nor '$OFFLINE_SSID'"
+  		fi
+		done
+	fi
 fi
-if [ $CHECK -gt 0 ] ; then
-  CURRENT_SSID=`grep "^ssid=$ONLINE_SSID" $HOSTAPD | cut -d"=" -f2`
-  if [ "$CURRENT_SSID" == "$ONLINE_SSID" ]; then
-    echo "$0 - still on $ONLINE_SSID"
-    exit 0
-  fi
-  echo "$0 change ssid to $ONLINE_SSID"| logger
-  sed -i s~^ssid=$OFFLINE_SSID~ssid=$ONLINE_SSID~ $HOSTAPD
-  killall -HUP hostapd
+
+if [ $HUP_NEEDED == 1 ]; then
+	killall -HUP hostapd # send HUP to all hostapd to load the new SSID
+	HUP_NEEDED=0
+	echo "HUP!"
 fi