[Click] dhcp cookie

Eddie Kohler kohler at cs.ucla.edu
Tue Jul 17 23:18:50 EDT 2007


Nick,

Thanks so much for this patch!  I tried to apply it a long time ago but 
confused myself; eventually based on the RFCs you are right.  There are a 
couple other places in the code that followed the same pattern that you didn't 
mention, so I just changed them.  Hopefully I will test the result.

Eddie


Nick wrote:
> Hi,
> 
> I think in package dhcp, in
> DHCPClient::make_discovery
> it should be
>   memcpy(&(discover_msg->magic), DHCP_OPTIONS_COOKIE, 4);
>   option_ptr = discover_msg->options;
> instead of
>   memcpy(discover_msg->options, DHCP_OPTIONS_COOKIE, 4);
>   option_ptr = discover_msg->options + 4;
> 
> and in DHCPClient::make_release
>   memcpy((unsigned char*)&(release_msg->magic), DHCP_OPTIONS_COOKIE, 4);
>   option_ptr = release_msg->options;
> instead of
>   memcpy(release_msg->options, DHCP_OPTIONS_COOKIE, 4);
>   option_ptr = release_msg->options + 4;
> 
> otherwise I think the packages are not created correctly and seem to be 
> dropped.
> 
> Nick
> PS. Hopefully this is the correct place to send this... If not excuse 
> me. Btw click is cool!
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