DragonFly BSD
DragonFly bugs List (threaded) for 2005-01
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Re: Routing bugs: zebra/quagga are unusable => I have found the cause


From: user@xxxxxxxxxxxxxx
Date: Wed, 05 Jan 2005 11:31:38 +0000
Cc: Joerg Sonnenberger <joerg@xxxxxxxxxxxxxxxxx>


I have found the reason why ospfd crashes with segmentation faults.


The culprit is line 261 of /usr/include/net/route.h

#define sa_dst rti_info[RTAX_DST]


This macro hides some local variables from ospfd and leads to attempts to read from a null address.


This macro and the other similar macrodefintions do not exist in FreeBSD. I believe that they break a large number of networking programs. The origin of the problem is that in this case the old C tradition to use small letters for variables and capital letters for macrodefintions has not been observed. This example shows that there was a very good reason for that tradition.

I suggest to change these macros to capital letters and in the future to define macros according to the tradition, because otherwise it is impossible to avoid name conflicts and the C compiler cannot signal the error in such cases.

The panic that appears with vlan interfaces is caused by a field (ifma_lladdr) in the interface structures that remains uninitialized in DragonFly, unlike in FreeBSD, but I have yet to find where it should have been initialized.


Best regards !





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