48 lines
1.9 KiB
Bash
Executable File
48 lines
1.9 KiB
Bash
Executable File
#!/bin/bash
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gwsel_lockfile="/tmp/gwsel_lockfile" # lockfile to allow for low bandwidth settings
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if [ -z "$1" ]; then
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echo
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echo "usage: $0 <network-interface> <update_interval [sec]> <total BW up [Mbit/sec]> <total BW down [Mbit/sec]>"
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echo
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echo "e.g. $0 eth0 60 10 10"
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echo
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exit
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fi
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while true
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do
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if [ ! -e ${gwsel_lockfile} ]; then # lockfile not present
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# Bandwidth currently used (time averaged)
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R1=$(cat "/sys/class/net/$1/statistics/rx_bytes")
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T1=$(cat "/sys/class/net/$1/statistics/tx_bytes")
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sleep "$2"
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R2=$(cat "/sys/class/net/$1/statistics/rx_bytes")
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T2=$(cat "/sys/class/net/$1/statistics/tx_bytes")
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TkbitPS=$(echo "scale=0; ($T2 - $T1) / 1024 * 8 / $2" | bc -l)
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RkbitPS=$(echo "scale=0; ($R2 - $R1) / 1024 * 8 / $2" | bc -l)
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# echo "BW used -- up $1: $TkbitPS kBit/s; down $1: $RkbitPS kBit/s"
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# Remaining bandwidth available; cut-off negative values
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Tavail_kbitPS=$(echo "scale=0; if (($3 * 1024 - $TkbitPS) >0) ($3 * 1024 - $TkbitPS) else 0" | bc -l)
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Ravail_kbitPS=$(echo "scale=0; if (($4 * 1024 - $RkbitPS) >0) ($4 * 1024 - $RkbitPS) else 0" | bc -l)
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# echo "BW available -- up $1: $Tavail_kbitPS kBit/s; down $1: $Ravail_kbitPS kBit/s"
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else # lockfile present
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Tavail_kbitPS=0
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Ravail_kbitPS=0
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sleep "$2"
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fi
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for bat in /sys/class/net/bat*; do
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iface=${bat##*/}
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batctl -m $iface gw_mode server "${Ravail_kbitPS}kbit/${Tavail_kbitPS}kbit"
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done
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# Erlangen schalten wir die Gatewayselection zur Sicherheit bei 450 leases ab, damit noch etwas Puffer nach oben ist!
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leasecount=$(/usr/sbin/dhcp-lease-list --parsable --lease /var/lib/dhcp/dhcpd.leases 2>&1 | grep "10.50.100" | wc -l)
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if [ $leasecount -gt 250 ]
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then
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batctl -m bat0 gw_mode off
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fi
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done
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