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Code: Select all

#!/bin/sh

# Action script to enable/disable wpa-roam interfaces in reaction to
# ifplugd events.
#
# Copyright: Copyright (c) 2008-2010, Kel Modderman <kel@otaku42.de>
# License:   GPL-2
#

PATH=/sbin:/usr/sbin:/bin:/usr/bin

if [ ! -x /sbin/wpa_action ]; then
        exit 0
fi

# ifplugd(8) - <iface> <action>
#
# If an ifplugd managed interface is brought up, disconnect any
# wpa-roam managed interfaces so that only one "roaming" interface
# remains active on the system.

IFPLUGD_IFACE="${1}"

case "${2}" in
        up)
                COMMAND=disconnect
                ;;
        down)
                COMMAND=reconnect
                ;;
        *)
                echo "$0: unknown arguments: ${@}" >&2
                exit 1
                ;;
esac

for CTRL in /var/run/wpa_supplicant/*; do
        [ -S "${CTRL}" ] || continue

        IFACE="${CTRL#/var/run/wpa_supplicant/}"

        # skip if ifplugd is managing this interface
        if [ "${IFPLUGD_IFACE}" = "${IFACE}" ]; then
                continue
        fi

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        # ignore if the interfaces use different subnets (no roaming)
        if [ "$2" = "up" ]; then
                /etc/wpa_supplicant/action_wpa_check_subnet.sh $IFACE $IFPLUGD_IFACE
        fi
        if [ $? -eq 0 ]; then
                echo leave $IFACE up
                continue
        else
                echo bring $IFACE down
        fi

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        if wpa_action "${IFACE}" check; then
                wpa_cli -i "${IFACE}" "${COMMAND}"
        fi
done

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#!/bin/bash
#check if interface 1 and interface 2 use the same subnet. if so return 1 else return 0

IFACE1="$1"
IFACE2="$2"
echo checking $IFACE1 against $IFACE2

get_addr () {
        #echo determine IP addr for $1
        ADDR=$(LC_MESSAGES=C ifconfig $1 | grep "inet addr" | awk '{ if ( $1 == "inet" ) { print $2 } }' | cut -d: -f2)
        #echo $ADDR
}

get_mask (){
        MASK=$(LC_MESSAGES=C ifconfig $1 | grep "inet addr" | awk '{ print $4 }' | cut -d: -f2)
        #echo $MASK
}

#wait for IPs or time out
TIMEOUT=30
for (( i=0; i<$TIMEOUT; i++))
do
        IP1=$(get_addr $IFACE1)
        echo $IP1
        if [ ! -z $IP1 ]; then
                MASK1=$(get_mask $IFACE1)
                break
        fi
        sleep 1
done

for (( i=0; i<$TIMEOUT; i++))
do
        IP2=$(get_addr $IFACE2)
        echo $IP2
        if [ ! -z $IP1 ]; then
                MASK2=$(get_mask $IFACE2)
                break
        fi
        sleep 1
done

echo $IP1:$MASK1 $IP2:$MASK2
if [ "$MASK1" == "$MASK2" ]; then
        #echo identical masks
        #echo checking IPs
        for i in 1 2 3 4
        do
                #echo checking byte $i of IP
                if [ "$(echo $MASK1 | cut -d. -f$i)" == "255" ]; then
                        echo "$(echo $IP1 | cut -d. -f$i)"
                        echo "$(echo $IP2 | cut -d. -f$i)"
                        if [ "$(echo $IP1 | cut -d. -f$i)" != "$(echo $IP2 | cut -d. -f$i)" ]; then
                                #echo different subnets
                                exit 0
                        #else
                        #       echo checking next byte
                        fi
                else
                        #echo mask has ended
                        break
                fi
        done
        #echo same subnet
        exit 1
else
        #echo different masks, most likely different subnets
        exit 0
fi

exit 0