Howto send a limited broadcast?

[tmm]

Boris Kochergin wrote:
> tmm wrote:
>>
>>
>> Bruce M. Simpson wrote:
>>> tmm wrote:
>>>> So, can anyone suggest how I can send a limited broadcast (on an 
>>>> interface that has been initalized with an IP and a subnet)?
>>>
>>> Use the IP_ONESBCAST option and send to the network broadcast 
>>> address for that subnet. The stack will change it into 
>>> 255.255.255.255 on output. See man page ip(4) for details.
>>>
>>> It's a hack, but it's largely due to how the stack has worked 
>>> historically.
>>>
>>> BMS
>> Thanks.  I wasn't aware of that option.
>>
>> But now I find that this option is not present in my (eCos port of) 
>> FreeBSD stack.  Either it was removed during the port, or the ported 
>> version is too old.
>>
>> Perhaps the best thing for me to do is to look at the 'normal' 
>> FreeBSD stack (as opposed to the eCos one) and see how IP_ONESBCAST 
>> is implemented.  Then perhaps I could do the same thing in my FreeBSD 
>> stack.
>>
>> Is there a way for me to download the FreeBSD source code without 
>> actually downloading, burning, and installing FreeBSD?  Looking 
>> around the FreeBSD website I don't see a source download link.
>>
>> thanks,
>> Tom.
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> You can get them via CVS: 
> http://www.freebsd.org/doc/en/books/handbook/cvsup.html.
>
> Also, although it, too, may be considered hacky, if the system you're 
> working on has pcap(3), you could just manually craft the broadcast 
> frame and send it out the interface yourself. I can provide some 
> sample code.
>
> -Boris
Yes, that is what I was looking for - I'll use cvsup/csup to get the 
sources.

I don't have pcap, but I do have access to the lower layers of the 
stack, so yes, I would be interested in seeing your code.  Doing 
something like that might turn out to be a better solution for me.

Thanks a lot.
Tom.