Help with udev dev.d and net script

Help with udev dev.d and net script

[Walt H]

Hello,

I've been struggling to try to get a shell script executed when my 
system starts it network interfaces. I'm running kernel 2.6.10 with 
udev-050 and the 20040923 hotplug scripts on a Gentoo based system. I've 
got 2 Intel e100 network interfaces (using kernel modules), one of which 
connects to my DSL modem and gets its IP address dynamically via DHCP.  
My ISP can be very slow in giving an IP address (30-45 seconds), which 
causes a problem with my firewall script, which is automatically 
generated by fwbuilder. What I've been trying to do, is execute a script 
under /etc/dev.d/ for my eth1 interface, which sleeps until the 
interface gets an IP address, and then runs the firewall script. 
Unfortunately, the firewall script needs an IP address for the interface 
to operate correctly, and without one, no traffic in or out will pass 
through this box.

I've tried putting the script in /etc/dev.d/eth1/ /etc/dev.d/net/eth1 
etc... but it never gets executed. I could brute force the issue by 
modifying a hotplug script or init script, but don't want to have to do 
this after each upgrade and the udev /etc/dev.d stuff seemed 
appropriate. What am I doing wrong?

My init scripts can be executed in parallel, which is what contributes 
to this problem I believe, as additional startup scripts may be executed 
before the interface is fully brought up. I could stop that I suppose, 
but I want to know why the dev.d stuff isn't working first I guess :)  
Thanks in advance,

-Walt

### /etc/dev.d/eth1/startfirewall.dev script follows:

#!/bin/bash
LOGFILE=/tmp/eth1-udev.log
echo `date` ": Starting fwbuilder firewall script...." >> $LOGFILE
NETUP=0
while [ $NETUP -eq 0 ]; do
        IP=`/sbin/ip -4 addr show dev eth1 | tail -n1` &> /dev/null
        if ! test -z "$IP"; then
                NETUP=1
                echo `date` ": eth1 up with IP: $IP" >> $LOGFILE
        else
                echo `date` ": eth1 not up yet. Will retry in 10s..." >> 
$LOGFILE
                sleep 10
        fi
done
echo `date` ": Activating firewall script now..." >> $LOGFILE
/etc/fwbuilder/Holman\ Network.fw &> /dev/null




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Re: Help with udev dev.d and net script

[Kay Sievers]

On Thu, 2004-12-30 at 10:28 -0600, Walt H wrote:
> What I've been trying to do, is execute a script 
> under /etc/dev.d/ for my eth1 interface, 

udev will not execute dev.d/ scripts for network interfaces if you don't
use udev to rename the interface. You need to hook into the hotplug call
not the udev notifier.

Kay 



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Re: Help with udev dev.d and net script

[Walt H]

Kay Sievers wrote:

>On Thu, 2004-12-30 at 10:28 -0600, Walt H wrote:
>  
>
>>What I've been trying to do, is execute a script 
>>under /etc/dev.d/ for my eth1 interface, 
>>    
>>
>
>udev will not execute dev.d/ scripts for network interfaces if you don't
>use udev to rename the interface. You need to hook into the hotplug call
>not the udev notifier.
>
>Kay 
>
>
>  
>
Thanks for the quick reply Kay.  I could've sworn I read at one point 
that I could do it with udev :)  Oh well, I guess I'll look into the 
hotplug interface instead. Thanks,

-Walt




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