Dual NIC clients

tag

Yes, that code will only work on the specific network defined in $nwid and if the kernel names the interfaces ethX and probably only if the number of interfaces match that particular piece of hw…

Mighty nice of you to help me out here… Appreciate it.

Thanks.

Wayne Workman

@tag Well the way I write it, it’ll work with however many NICs a system has. We will need to use the new feature that @Tom-Elliott so kindly implemented maybe a month ago, the host’s Host Init field. Basically we will build an init for each of your subnets, then use groups to assign the right inits to the right computers - so that those computers in those subnets use the correct interface.

Sounds like a lot - but I really don’t think it is. I think this is going to be very easy.

Wayne Workman

I’ve been working on this.

This is my first go-round with a custom init so I’m asking that @Sebastian-Roth and @Tom-Elliott and @george1421 to take a look, too.

I’ve not tested, as I don’t readily have available a machine with multiple interfaces, but I think I’ve got a universal init that you can pass a custom kernel argument to, which will ensure the correct interface is up, and others are down. So far, I’ve coded for three possible interfaces. I already had many of these functions already written in another project I’ve been working on.

in the init, I’ve edited the file /usr/share/fog/lib/funcs.sh to include these functions:

cidr2mask() {
        #Expects CIDR notation (a single integer between 0 and 32)
        local i=""
        local mask=""
        local full_octets=$(($1/8))
        local partial_octet=$(($1%8))
        for ((i=0;i<4;i+=1)); do
        if [[ $i -lt $full_octets ]]; then
                mask+=255
        elif [[ $i -eq $full_octets ]]; then
                mask+=$((256 - 2**(8-$partial_octet)))
        else
                mask+=0
        fi
                test $i -lt 3 && mask+=.
        done
        echo $mask
}

getCidr() {
        #Expects an interface name to be passed.
        local cidr
        cidr=$(ip -f inet -o addr | grep $1 | awk -F'[ /]+' '/global/ {print $5}' | head -n2 | tail -n1)
        echo $cidr
}
mask2network() {
        #Expects IP address passed 1st, and Subnet Mask passed 2nd.
        OIFS=$IFS
        IFS='.'
        read -r i1 i2 i3 i4 <<< "$1"
        read -r m1 m2 m3 m4 <<< "$2"
        IFS=$OIFS
        printf "%d.%d.%d.%d\n"  "$((i1 & m1))" "$((i2 & m2))" "$((i3 & m3))" "$((i4 & m4))"
}
GetInterfaceInfo() {
	DIR="/"

	ip link show > $DIR/interfaces.txt

	interface1name="$(sed -n '3p' $DIR/interfaces.txt)"
	interface2name="$(sed -n '5p' $DIR/interfaces.txt)"
	interface3name="$(sed -n '7p' $DIR/interfaces.txt)"


	rm -f $DIR/interfaces.txt

	echo $interface1name | cut -d \: -f2 | cut -c2- > $DIR/interface1name.txt
	echo $interface2name | cut -d \: -f2 | cut -c2- > $DIR/interface2name.txt
	echo $interface3name | cut -d \: -f2 | cut -c2- > $DIR/interface3name.txt	

	interface1name="$(cat $DIR/interface1name.txt)"
	interface2name="$(cat $DIR/interface2name.txt)"
	interface2name="$(cat $DIR/interface2name.txt)"

	rm -f $DIR/interface1name.txt
	rm -f $DIR/interface2name.txt
	rm -f $DIR/interface3name.txt

	#Bring up interfaces.

	echo “iface $interface1name inet dhcp” >>/etc/network/interfaces
	echo “iface $interface2name inet dhcp” >>/etc/network/interfaces
	echo “iface $interface3name inet dhcp” >>/etc/network/interfaces



	ip link set $interface1name up
	ip link set $interface2name up
	ip link set $interface3name up
	sleep 4




	interface1ip="$(/sbin/ip addr show | grep $interface1name | grep -o "inet [0-9]*\.[0-9]*\.[0-9]*\.[0-9]*" | grep -o "[0-9]*\.[0-9]*\.[0-9]*\.[0-9]*")"

	interface2ip="$(/sbin/ip addr show | grep $interface2name | grep -o "inet [0-9]*\.[0-9]*\.[0-9]*\.[0-9]*" | grep -o "[0-9]*\.[0-9]*\.[0-9]*\.[0-9]*")"

	interface3ip="$(/sbin/ip addr show | grep $interface3name | grep -o "inet [0-9]*\.[0-9]*\.[0-9]*\.[0-9]*" | grep -o "[0-9]*\.[0-9]*\.[0-9]*\.[0-9]*")"


	if [[ -z $interface1ip ]]; then
		interface1ip=127.0.0.1
	fi

	if [[ -z $interface2ip ]]; then 
		interface2ip=127.0.0.1
	fi

	if [[ -z $interface3ip ]]; then 
                interface3ip=127.0.0.1
        fi
	
	interface1network=$(mask2network $interface1ip $(cidr2mask $(getCidr $interface1name)))
	interface2network=$(mask2network $interface2ip $(cidr2mask $(getCidr $interface2name)))
	interface3network=$(mask2network $interface3ip $(cidr2mask $(getCidr $interface3name)))





}

setCorrectInterface() {
for arg in $(cat /proc/cmdline) do  
    echo $arg | grep -q USE_NETWORK
    if [ $? == 0 ] then      
        val=$(echo $arg | cut -d= -f2)
        desiredNetwork=$val
    fi
done

GetInterfaceInfo

if [[ $interface1network==$desiredNetwork ]] then
        ip link set $interface1name up
        ip link set $interface2name down
        ip link set $interface3name down
elif [[ $interface2network==$desiredNetwork ]] then
	ip link set $interface1name down
       	ip link set $interface2name up
        ip link set $interface3name down
else [[ $interface3network==$desiredNetwork ]] then
	ip link set $interface1name down
        ip link set $interface2name down
        ip link set $interface3name up
fi



}

And I’ve added a call to the main function in the main fog script file /bin/fog between the usb part and the task calling, around line 10 like this:

#!/bin/bash
. /usr/share/fog/lib/funcs.sh
### If USB Boot device we need a way to get the kernel args properly
if [[ $boottype == usb && ! -z $web ]]; then
    mac=$(getMACAddresses)
    wget -q -O /tmp/hinfo.txt "http://${web}service/hostinfo.php?mac=$mac"
    [[ -f /tmp/hinfo.txt ]] && . /tmp/hinfo.txt
fi

setCorrectInterface

if [[ -n $mode && $mode != +(*debug*) ]]; then
    case $mode in
        wipe)
            fog.wipe
            ;;
        checkdisk)
            fog.testdisk
            ;;
        photorec)
            fog.photorec
            ;;
        badblocks)
            fog.surfacetest
            ;;
        clamav)
            fog.av
            ;;
        autoreg)
            fog.auto.reg
            ;;
        manreg)
            fog.man.reg
            ;;
        inventory)
            fog.inventory
            ;;
        capone)
            fog.capone
            ;;
        winpassreset)
            fog.chntpw
            ;;
        quickimage)
            fog.quickimage
            ;;
        sysinfo)
            fog.sysinfo
            ;;
        "donate.full")
            fog.donatefull
            ;;
        *)
            handleError "Fatal Error: Unknown mode :: $mode ($0)\n   Args Passed: $*"
            ;;
    esac
else
    case $type in
        down)
            fog.download
            ;;
        up)
            fog.upload
            ;;
        *)
            [[ -z $type ]] && type="Null"
            handleError "Fatal Error: Unknown request type :: $type"
            ;;
    esac
fi

With modifications to the init like this (and using fog trunk), You’d simply specify this custom init, and pass the kernel argument for the network you want to use. For example:

tag

@Wayne-Workman

That would work nicely, seeing you can use different inits. I didn’t know that as it is not possible in 1.2.0.

The caveat is that I would have to redo the server as trunk requires a newer Ubuntu according to @Quazz.

Wayne Workman

@tag correct. No getting around that.

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