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rpc.dracd(8) System Manager's Manual rpc.dracd(8)


rpc.dracd - Dynamic Relay Authorization Control server


rpc.dracd [-i ] [ -e expire ] [ dbfile ]



rpc.dracd is the Dynamic Relay Authorization Control server. It uses the Berkeley db package to maintain a relay authorization map for sendmail, by default /etc/drac/dracd.db. POP and IMAP mail servers make an RPC call to add an entry to the authorization cache after they have authenticated each user. The daemon, rpc.dracd, adds or updates entries in the cache, and periodically expires old entries. Only trusted mail servers are permitted to communicate with rpc.dracd, as controlled by /etc/drac/dracd.allow. If this file does not exist, all local IP addresses are permitted.

Allow File Format

The Allow File file consists of entries of the form:

netmask netaddr

where both netmask and netaddr must be dotted quads.


Initialize the database on startup.
Set the expire time limit. expire is the number of minutes the entries will remain in the database. It defaults to 30 minutes.
Use a different database file name.


default database file
default allow file.


This rpc.dracd version is protected by the tcp_wrapper library. You have to give the clients access to rpc.dracd if they should be allowed to use it. To allow connects from clients of the domain you could use the following line in /etc/hosts.allow:


You have to use the daemon name dracd for the daemon name (even if the binary has a different name).

For further information please have a look at the tcpd(8) and hosts_access(5) manual pages.




The following signals have the specified effect when sent to the server process using the kill(1) command.

closes the database and terminates the server.
22 Jul 1998