Commit 2550af34 authored by rubo77's avatar rubo77
Browse files

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'
parents f7abefe1 109bd085
......@@ -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
==============
......
......@@ -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
Markdown is supported
0% or .
You are about to add 0 people to the discussion. Proceed with caution.
Finish editing this message first!
Please register or to comment