back-dnssrv crashes slapd (ITS#2116)

[rick@vanrein.org]

Full_Name: Rick van Rein
Version: 2.1.5
OS: MacOS X
URL: 
Submission from: (NULL) (130.89.15.246)


Hello,

When configuring a DNSSRV backend as the last database, it crashes the slapd
daemon (more precisely, it causes a panic situation) when no dc components are
found.

The command
   ldapsearch -h localhost -b 'o=OpenFortress,c=NL'
asks for a non-supported suffix on my machine; the DNSSRV backend doesn't know
how to relay this request, and ends the slapd with the following final messages
(-d 15):
   => ldap_bv2dn(o=OpenFortress,c=NL,0)
   <= ldap_bv2dn(o=OpenFortress,c=NL,0)=0
   DNSSRV: dn="o=OpenFortress,c=NL" -> domain=""
   dnssrv.c:181: failed assertion `domain != NULL'
   daemon: select: listen=6 active_threads=1 tvp=NULL

Note: I am trying to use the backend to avoid that I need the "referral"
configfile option to point to a dc-only root server.  I want to support
dc-styled names as well as o/c-styled names.  That's not accounted for, it would
seem.

Thanks,
Rick van Rein.