DSPAM Hash Driver Patches
I use the fantastic DSPAM SPAM filter in my mail server. I like it very much, specially when using the built-in hash-based storage, making it very fast and really easy to setup. That is, if the documentation and administration tools weren't so lacking. On the plus side, I got to know a little better the tool that keeps my email sanity and respect the developers that make it happen.
If you are an user of the hash driver, you can't rely on the provided tools to maintain your installation. The recommended way of cleaning old messages signatures doesn't work for this driver. Also, the hash-based database has to be cleaned from time to time or it will grow too big, but the tool to do it (cssclean) just doesn't work. To handle these problems, I first had to patch DSPAM so I could get a working cssclean. The main patch was created by Frank Cusack and you can get it in his aptly named message "cssclean is a redheaded stepchild" to the dspam-dev mailing list.
The second patch isn't strictly necessary (and I fear it might violate some design principle of DSPAM), but it keeps cssclean from resetting the statistics of the database. I really can't remember where I found it, so I post it here:
diff -ru dspam-3.8.0.orig/src/tools.hash_drv/cssclean.c dspam-3.8.0/src/tools.hash_drv/cssclean.c
--- dspam-3.8.0.orig/src/tools.hash_drv/cssclean.c 2006-05-27 18:00:36.000000000 -0300
+++ dspam-3.8.0/src/tools.hash_drv/cssclean.c 2007-06-27 19:18:51.000000000 -0300
@@ -167,7 +167,7 @@
header = offset;
filepos += sizeof(struct _hash_drv_header);
}
-
+ bcopy (old.header, new.header, sizeof(struct _hash_drv_header));
_hash_drv_close(&new);
_hash_drv_close(&old);
rename(newfile, filename);
Finally, I run the following script monthly using cron:
# Clean hashes and signatures.
for u in /var/lib/dspam/data/*/*.css; do
/usr/bin/cssclean $u
done
find /var/lib/dspam/data -name *sig -type f -mtime +30 -exec rm -f {} \;
Probably you will have to adapt it to the file locations of your DSPAM installation.