181 lines
6.2 KiB
Bash
Executable File
181 lines
6.2 KiB
Bash
Executable File
#!/bin/sh
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#################
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# safety checks #
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#################
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safety_exit() {
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echo $1, exiting with error code 2
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exit 2
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}
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pgrep -f autoupdater >/dev/null && safety_exit 'autoupdater running'
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UT=$(sed 's/\..*//g' /proc/uptime)
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[ $UT -gt 60 ] || safety_exit 'less than one minute'
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[ $(find /var/run -name hostapd-phy* | wc -l) -gt 0 ] || safety_exit 'no hostapd-phy*'
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# only once every timeframe minutes the SSID will change to the Offline-SSID
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# (set to 1 minute to change immediately every time the router gets offline)
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MINUTES="$(uci -q get ssid-changer.settings.switch_timeframe)"
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: ${MINUTES:=30}
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# the first few minutes directly after reboot within which an Offline-SSID always may be activated
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# (must be <= switch_timeframe)
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FIRST="$(uci -q get ssid-changer.settings.first)"
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: ${FIRST:=5}
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# the Offline-SSID will start with this prefix use something short to leave space for the nodename
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# (no '~' allowed!)
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PREFIX="$(uci -q get ssid-changer.settings.prefix)"
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: ${PREFIX:='FF_Offline_'}
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if [ "$(uci -q get ssid-changer.settings.enabled)" = '0' ]; then
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DISABLED='1'
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else
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DISABLED='0'
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fi
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# generate the ssid with either 'nodename', 'mac' or to use only the prefix set to 'none'
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SETTINGS_SUFFIX="$(uci -q get ssid-changer.settings.suffix)"
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: ${SETTINGS_SUFFIX:='nodename'}
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if [ $SETTINGS_SUFFIX = 'nodename' ]; then
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SUFFIX="$(uname -n)"
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# 32 would be possible as well
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if [ ${#SUFFIX} -gt $((30 - ${#PREFIX})) ]; then
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# calculate the length of the first part of the node identifier in the offline-ssid
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HALF=$(( (28 - ${#PREFIX} ) / 2 ))
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# jump to this charakter for the last part of the name
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SKIP=$(( ${#SUFFIX} - $HALF ))
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# use the first and last part of the nodename for nodes with long name
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SUFFIX=${SUFFIX:0:$HALF}...${SUFFIX:$SKIP:${#SUFFIX}}
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fi
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elif [ $SETTINGS_SUFFIX = 'mac' ]; then
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SUFFIX="$(uci -q get network.bat0.macaddr | /bin/sed 's/://g')"
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else
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# 'none'
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SUFFIX=''
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fi
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OFFLINE_SSID="$PREFIX$SUFFIX"
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# get all SSIDs (replace \' with TICX and back to keep a possible tic in an SSID)
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ONLINE_SSIDs="$(uci show | grep wireless.client_radio[0-9]\. | grep ssid | awk -F '=' '{print $2}' | sed "s/\\\'/TICX/g" | tr \' \~ | sed "s/TICX/\\\'/g" ) "
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# if for whatever reason ONLINE_SSIDs is NULL:
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: ${ONLINE_SSIDs:="~FREIFUNK~"}
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# temp file to count the offline incidents during switch_timeframe
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TMP=/tmp/ssid-changer-count
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if [ ! -f $TMP ]; then echo "0">$TMP; fi
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OFF_COUNT=$(cat $TMP)
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TQ_LIMIT_ENABLED="$(uci -q get ssid-changer.settings.tq_limit_enabled)"
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# if true, the offline ssid will only be set if there is no gateway reacheable
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# upper and lower limit to turn the offline_ssid on and off
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# in-between these two values the SSID will never be changed to preven it from toggeling every Minute.
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: ${TQ_LIMIT_ENABLED:='0'}
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if [ $TQ_LIMIT_ENABLED = 1 ]; then
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TQ_LIMIT_MAX="$(uci -q get ssid-changer.settings.tq_limit_max)"
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# upper limit, above that the online SSID will be used
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: ${TQ_LIMIT_MAX:='45'}
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TQ_LIMIT_MIN="$(uci -q get ssid-changer.settings.tq_limit_min)"
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# lower limit, below that the offline SSID will be used
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: ${TQ_LIMIT_MIN:='35'}
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# grep the connection quality of the currently used gateway
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GATEWAY_TQ=$(batctl gwl | grep -e "^=>" -e "^\*" | awk -F '[('')]' '{print $2}' | tr -d " ")
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if [ ! $GATEWAY_TQ ]; then
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# there is no gateway
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GATEWAY_TQ=0
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fi
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MSG="TQ is $GATEWAY_TQ, "
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if [ $GATEWAY_TQ -ge $TQ_LIMIT_MAX ]; then
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CHECK=1
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elif [ $GATEWAY_TQ -lt $TQ_LIMIT_MIN ]; then
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CHECK=0
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else
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# this is just get a clean run if we are in-between the grace periode
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echo "TQ is $GATEWAY_TQ, do nothing"
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exit 0
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fi
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else
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MSG=""
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CHECK="$(batctl gwl -H|grep -v "gateways in range"|wc -l)"
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fi
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UP=$(($UT / 60))
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M=$(($UP % $MINUTES))
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HUP_NEEDED=0
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if [ "$CHECK" -gt 0 ] || [ "$DISABLED" = '1' ]; then
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echo "node is online"
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LOOP=1
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# check status for all physical devices
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for HOSTAPD in $(ls /var/run/hostapd-phy*); do
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ONLINE_SSID="$(echo $ONLINE_SSIDs | awk -F '~' -v l=$((LOOP*2)) '{print $l}')"
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LOOP=$((LOOP+1))
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CURRENT_SSID="$(grep "^ssid=$ONLINE_SSID" $HOSTAPD | cut -d"=" -f2)"
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if [ "$CURRENT_SSID" = "$ONLINE_SSID" ]; then
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echo "SSID $CURRENT_SSID is correct, nothing to do"
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break
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fi
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CURRENT_SSID="$(grep "^ssid=$OFFLINE_SSID" $HOSTAPD | cut -d"=" -f2)"
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if [ "$CURRENT_SSID" = "$OFFLINE_SSID" ]; then
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# set online
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logger -s -t "gluon-ssid-changer" -p 5 $MSG"SSID is $CURRENT_SSID, change to $ONLINE_SSID"
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sed -i "s~^ssid=$CURRENT_SSID~ssid=$ONLINE_SSID~" $HOSTAPD
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# HUP here would be to early for dualband devices
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HUP_NEEDED=1
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else
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logger -s -t "gluon-ssid-changer" -p 5 "could not set to online state: did neither find SSID '$ONLINE_SSID' nor '$OFFLINE_SSID'. Please reboot"
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fi
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done
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elif [ "$CHECK" -eq 0 ]; then
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echo "node is considered offline"
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if [ $UP -lt $FIRST ] || [ $M -eq 0 ]; then
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# set SSID offline, only if uptime is less than FIRST or exactly a multiplicative of switch_timeframe
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if [ $UP -lt $FIRST ]; then
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T=$FIRST
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else
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T=$MINUTES
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fi
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#echo minute $M, check if $OFF_COUNT is more than half of $T
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if [ $OFF_COUNT -ge $(($T / 2)) ]; then
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# node was offline more times than half of switch_timeframe (or than $FIRST)
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LOOP=1
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for HOSTAPD in $(ls /var/run/hostapd-phy*); do
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ONLINE_SSID="$(echo $ONLINE_SSIDs | awk -F '~' -v l=$((LOOP*2)) '{print $l}')"
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LOOP=$((LOOP+1))
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CURRENT_SSID="$(grep "^ssid=$OFFLINE_SSID" $HOSTAPD | cut -d"=" -f2)"
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if [ "$CURRENT_SSID" = "$OFFLINE_SSID" ]; then
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echo "SSID $CURRENT_SSID is correct, nothing to do"
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break
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fi
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CURRENT_SSID="$(grep "^ssid=$ONLINE_SSID" $HOSTAPD | cut -d"=" -f2)"
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if [ "$CURRENT_SSID" = "$ONLINE_SSID" ]; then
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# set offline
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logger -s -t "gluon-ssid-changer" -p 5 $MSG"$OFF_COUNT times offline, SSID is $CURRENT_SSID, change to $OFFLINE_SSID"
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sed -i "s~^ssid=$ONLINE_SSID~ssid=$OFFLINE_SSID~" $HOSTAPD
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HUP_NEEDED=1
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else
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logger -s -t "gluon-ssid-changer" -p 5 "could not set to offline state: did neither find SSID '$ONLINE_SSID' nor '$OFFLINE_SSID'. Please reboot"
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fi
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done
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fi
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#else echo minute $M, just count $OFF_COUNT
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fi
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echo "$(($OFF_COUNT + 1))">$TMP
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fi
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if [ $HUP_NEEDED = 1 ]; then
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# send HUP to all hostapd to load the new SSID
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killall -HUP hostapd
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HUP_NEEDED=0
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echo "HUP!"
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fi
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if [ $M -eq 0 ]; then
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# set counter to 0 if the timeframe is over
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echo "0">$TMP
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fi
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