Re: [ECOS] Can't get socket's IP address w/ new stack?

[Gary Thomas <gary at mlbassoc dot com>]

On Fri, 2003-08-15 at 15:33, Grant Edwards wrote:
> On Fri, Aug 15, 2003 at 03:05:08PM -0500, Grant Edwards wrote:
> 
> > I use the following routines to get the current IP address and
> > netmask.  Both worked fine under the old network stack, but
> > with the new stack, getting the IP address retuns nothing
> > (stuct is all 0's).
> 
> >   if (ioctl(s, SIOCGIFADDR, &ifr))
> 
> OK.  The stack thinks there are two external interfaces.  The
> first one has an IP address of 0.0.0.0 and the second one has
> the IP address of 10.0.0.7 (that's the one who's IP address I'm
> trying to get).

You mean an 'eth0' and an 'eth1'?  If so, why doesn't your code
ask for the information for 'eth1'?

> 
> I've been tracing execution of the ioctl() code from in.c, and
> AFAICT, the _only_ way you can get it to return info on an
> interface other than 0.0.0.0 (the first one on the list), is to
> specify the IP address of the interface for which you want info.
> 
> IOW, you have to pass in the interface's IP address in the
> request for the interface's IP address.
> 
> Can somebody explain to me how SIOCGIFADDR is supposed to work
> in the new stack?
> 
> I've been googling all afternoon for example code using
> SIOCGIFADDR, but all the examples I can find are identical to
> what I did with the old stack -- and that doesn't work with the
> new stack.
> 

What happens if you call _show_all_interfaces() (defined in 
net/common/current/src/ifaddrs.c)?  If this shows useful information,
perhaps you could fetch what you need the same way.

(I know it's not a direct answer, but it might help)

-- 
Gary Thomas <gary@mlbassoc.com>
MLB Associates


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