NIO CommKit Host Interface Installation and System Administration Manual

3-31
Control Tables (from AT&T 255-110-127)
srvtab
Server Table Scanning Rules section. Lines in each server table file will still
match the incoming call request only if they contain the service field wild
card or if the service field matches the requested service.
If the opening of the appropriate server table file fails, the server attempts to
use the file * as the server table file. If the opening of this catchall server
table file fails, the incoming call request is rejected with an access denied
rejection code. Lines in the catchall server table file will only match the
incoming call request if they contain the service field wild card or if the ser-
vice field exactly matches the requested service.
NOTE: The server will only attempt to use the catchall server table file if the
appropriate server table file does not exist or cannot be opened. The server
only scans a single server table file for each call request.
Additional user-defined services would be provided by adding additional
server table files to the server table directory.
Take care when handling the files - and *, since these characters usually have
special meaning to editor programs and the shell, [see sh(1) in the UNIX Sys-
tem V Release 4 User’s Reference Manual]. System administrators should
use the following commands when editing these files [see vi(1) in the UNIX
System V Release 4 User’s Reference Manual]:
vi ./- # to edit the file “-”
vi ./\* # to edit the file “*”
Restart dkserver when changing to or from a directory mode server control
table for the change to take effect; all incoming requests will otherwise be
denied.
Summary
Administrators should use these server table facilities to grant remote access
to their system for authorized remote systems and users. Wild cards in origi-
nating group patterns should be used judiciously, if at all. The administrator
should thoroughly examine every entry in his/her server table file.