[PATCH] dhclient active interface detection patch

[Martin Blapp]

Hi,

>
> Excellent work. However - we may wish to think about modifying it for
> use wiht 802.11 interfaces. Yesterday I got 4.7-RELEASE working on a
> friend's machine which is now acting as wireless backhaul from a building
> in Bow, East London with an antenna pointed at Hackney; from reboot,
> the machine associates with the AP in Hackney and invokes dhclient
> to get an IP from the AP once associated.
>
> But in order to get things to happen in the right order, I had to create
> a script /etc/start_if.wi0, and write a little program called 'waitforap'.
>
> I've attached it. It's not perfect, but it does the job; rather than
> attempting to perform a DHCPREQUEST broadcast before the interface is
> ready, it waits until wi0's status is 'associated'.

Hi,

Ehm. You should just use my dhclient patch and not need any furter scripts
and patches. I do just the same as you.

All you have to do is :

dhclient -nw wi0

Can you confirm that my patch works here too ?

+       if (ioctl(sock, SIOCGIFMEDIA, (caddr_t)&ifmr) < 0) {
+               /*
+                * Interface doesn't support SIOCGIFMEDIA, presume okay
+                */
+               close(sock);
+               return (1);
+       }
+       close(sock);
+
+       if (ifmr.ifm_count == 0) {
+               /*
+                * this is unexpected (to me), but we'll just assume
+                * that this means interface does not support SIOCGIFMEDIA
+                */
+               return (1);
+       }
+
+       if (ifmr.ifm_status & IFM_AVALID) {
+               if (ifmr.ifm_status & IFM_ACTIVE)
+                       return (1);
+       } else
+               return (0);
+
+       return (0);

Martin