XDMCP Indirect

When a host attempts to connect to the login server via XDMCP-indirect, the host name is compared to the Xaccess entries to determine whether the host is allowed access to the login server. Each Xaccess entry is similar to the XDMCP-direct entries, including wildcards, except that each entry is marked with a CHOOSER string. For example:

amazon.waterloo.com   CHOOSER BROADCAST
 *.dept5.waterloo.com  CHOOSER BROADCAST
 !*		CHOOSER BROADCAST

Again, the first entry allows access to the login server from host amazon.waterloo.com, the second entry allows access from any host whose full domain name ends in dept5.waterloo.com, and the last entry disallows access from any other host.

One of the following can be listed after the CHOOSER.

• BROADCAST

• list of host names

BROADCAST tells the login server to broadcast to the login server sub-network to generate a list of available login server hosts. A list of host names tells the login server to use that list for the list of available login hosts. For example:

amazon.waterloo.com   CHOOSER shoal.waterloo.com alum.waterloo.com
 *.dept5.waterloo.com  CHOOSER BROADCAST
 !*		CHOOSER BROADCAST

If amazon.waterloo.com connects via XDMCP-indirect, it will be presented a list containing shoal and alum. If alice.dept5.waterloo.com connects, it will be presented with a list of all available login server hosts on the login server sub-network. Other XDMCP-indirect requests will be denied.

An alternative to specifying a list of host names is to define one or more macros containing the list of host names. For example:

%list1			shoal.waterloo.com alum.waterloo.com
 amazon.waterloo.com  CHOOSER %list1