USB device ID to determine network address?

[Shawn Rutledge <shawn.t.rutledge@gmail.com>]

I'm trying to come up with a way to have a different network address
assigned to different USB devices (a Zaurus and a cell phone; the
former uses usbnet, the latter usblan).  This would be a lot like the
case of having two USB ethernet devices for a router, or a USB
ethernet device and a USB cable modem.  So far in
/etc/hotplug/usb.agent I have added stuff like this:

    usb_idVendor=$((0x$1))
    usb_idProduct=$((0x$2))
    usb_bcdDevice=$((0x$3))
    ifconfig > /tmp/nets
    rm -rf /tmp/lastusb
    mkdir /tmp/lastusb
    touch /tmp/lastusb/"${usb_idVendor}:${usb_idProduct}"
    echo -n "${usb_idVendor}:${usb_idProduct}" > /tmp/lastusbdev
    /bin/sync
    sleep 1

then /etc/init.d/net.usb0 and net.usb1 both look like this:

start() {
    ebegin "Bringing ${IFACE} up"
    echo "Bringing ${IFACE} up" > /var/log/usb0.log
    if [ -e /tmp/lastusb/1245:36914 ]
    then
        /sbin/ifconfig ${IFACE} 192.168.129.200 up 2>/dev/null
    else
        /sbin/ifconfig ${IFACE} 192.168.1.1 up 2>/dev/null
    fi
    /etc/init.d/dhcp start
    eend 0
}

It's acting as though the file modifications in /tmp are not completed
before the init.d script gets called, because for example after
plugging in the zaurus, I have to plug in the phone twice before it
gets the correct address, and vice-versa.  But I added the /tmp/nets
thing to see if that is true, and actually /tmp/nets ends up
containing the network state before the hotplug, just as I would have
expected.

Anyway it's kindof inelegant, and I was wondering if this problem has
already been solved in some other way?

Actually, it might be better if there was some way to have one device
always get interface usb0 and the other always get usb1, even if only
one of them is actually plugged in; then I could just configure the
different addresses in /etc/conf.d/net.  (This is a gentoo system.)

Alternatively if the init.d script had some other way to get the
device which is being configured....

Or, if there was a config file to map devices to their properties like
network address for network devices, mount location for mass storage
devices, tty for modem devices or printers, etc. so all that stuff
could be maintained in one config file.


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