Manual Reference Pages - ZEPHYRD (8)
zephyrd - Zephyr server daemon
zephyrd is the central server for the Zephyr Notification System.
It maintains a location database of all currently logged-in users, and a
subscription database for each users Zephyr clients.
zephyrd communicates with daemons running on other Zephyr server hosts, to
provide a reliable service.
While running, any unusual conditions are recorded via
syslog(3) to facility local6 at various levels.
-d option enables logging of additional debugging information.
zephyrd is executed, it requests a list of server machines from Hesiod and
initializes its state from any
zephyrds executing on the other known servers. This initialization
is only performed after the zephyrds have authenticated themselves
to each other via Kerberos.
The server then enters a dispatch loop, servicing requests from clients and
SIGUSR1 enables logging of additional debugging information.
SIGUSR2 disables the logging of additional debugging information.
zephyrd to re-read the default subscription file and to re-query Hesiod about
valid peers. Any peers which are not responding and no longer
mentioned in Hesiod are flushed; any peers not previously named by
Hesiod are added.
SIGINT and SIGTERM cause
zephyrd to gracefully shut down.
zephyrd to dump the location and subscription databases to
/var/tmp/zephyr.db in an ASCII format.
Certain notice classes are restricted by the Zephyr server. Each such
class has access control lists enumerating who may transmit (xmt-*.acl) or
subscribe to that particular class. Subscriptions may be
restricted either absolutely (sub-*.acl files), or by instance restrictions.
iws-*.acl files control subscriptions to wildcarded instances.
iui-*.acl files control subscriptions to instances which are not the
Kerberos principal identity of the subscriber.
If an access control list of a given type is absent, there is no
restriction of that type on the class, except that any notices of the
class must be authenticated.
The class registry lists all classes which are restricted.
List of classes which are restricted
Access Control Lists for instance-wildcard restrictions
Access Control Lists for instance-identity restrictions
Access Control Lists for subscribing
Access Control Lists for transmitting
Kerberos 4 Service keys
Kerberos V Service keys
Current Kerberos tickets for exchange with other servers
File containing an ASCII dump of the database.
The current implementation of the Zephyr server (zephyrd(8)) makes
no distinction between realm-announced, net-visible and net-announced
zephyr(1), zhm(8), kerberosintro(1), hesiod(3), access_control_lists(?),
Athena Technical Plan, Sections E.4.1 (Zephyr Notification Service) and
E.2.1 (Kerberos Authentication and Authorization System)
John T. Kohl, MIT Project Athena and Digital Equipment Corporation
Copyright (c) 1987,1988 by the Massachusetts Institute of Technology.
All Rights Reserved.
zephyr(1) specifies the terms and conditions for redistribution.
|MIT Project Athena ||ZEPHYRD (8) ||July 1, 1988 |
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