udhcp and busybox

[Devin Bayer]

On Mar 26, 2006, at 13:22, Rob Landley wrote:

> On Sunday 26 March 2006 3:22 pm, Devin Bayer wrote:
>>
>> If you do what you suggest and set a gateway when another is already
>> set, you'll bork the whole system.
>
> I do it all the time, actually, and the tools I'm using delete the old
> gateway.  I can ifconfig the interface down first to be sure, though.
>
> If somebody runs a dhcp client on eth0 and another one on eth1,  
> they'll
> probably need a script.  That's not my problem.

Well that's tough to overcome. What if I make it a config option?   
Essentially to support multiple network interfaces one needs to do:

while(0 == ioctl(SIOCDELRT)) /* loop */;

before the SIOCADDRT.  It would also apply to ifup.  Untested, this  
should give you a better idea what I need:

Index: ifupdown.c
===================================================================
--- ifupdown.c  (revision 14662)
+++ ifupdown.c  (working copy)
@@ -382,6 +382,7 @@
#else
         result = execute("ifconfig %iface% [[media %media%]] [[hw % 
hwaddress%]] [[mtu %mtu%]] up", ifd, exec);
         result += execute("ifconfig %iface% add %address%/%netmask 
%", ifd, exec);
+       execute("route -A inet6 del ::/0", ifd, exec);
         result += execute("[[ route -A inet6 add ::/0 gw %gateway 
% ]]", ifd, exec);
#endif
         return ((result == 3) ? 3 : 0);
@@ -468,6 +469,7 @@
                                 "[[broadcast %broadcast%]]  
[[pointopoint %pointopoint%]] "
                                 "[[media %media%]] [[mtu %mtu%]]  
[[hw %hwaddress%]] up",
                                 ifd, exec);
+       execute("route del default", ifd, exec);
         result += execute("[[ route add default gw %gateway% %iface 
% ]]", ifd, exec);
         return ((result == 2) ? 2 : 0);
#endif

-- 
Devin Bayer