Support 'virtual' users who have no homeDirectory, uidNumber or gidNumber.
Permit read-only access by a user named "anonymous", with any password.
Assume a conventional DIT with users under ou=people,dc=example,dc=com.
Read the LDAP bindPassword from a file (not baked into the code).
Log progress and problems to syslog.
The common package defines the interfaces that a protocol must implement
and contain code that can be shared among supported protocols.
This way should be easier to support new protocols