NIO CommKit Host Interface Installation and System Administration Manual

3-21

Control Tables (from AT&T 255-110-127)

srvtab

Server Table Scanning Rules

Several parameters are associated with each incoming call. Some of these

parameters include the requester’s originating data switch group, the

requested service name, and the requester’s user ID, if known. The server

uses these parameters to match lines in the server table during the call vali-

dation process.

Modifications to the Server Table

The server table is opened each time a call request is received from the data

switch node. Opening the server table for each incoming call allows the

administrator to make modiﬁcations that will take effect on the next incom-

ing call. There is no need to restart the server after modiﬁcations to the

table.

%r The protocol field of the dialstring, if any.

%s The pathname of the user’s shell as obtained from the /etc/passwd

file. A null shell field in the password file will be expanded as

/bin/sh.

%t The device file name that corresponds to the assigned Datakit VCS

channel, minus the initial /dev/.

%u The numeric user ID of the user placing the call.

%x The call flag applies only to originating data switch ports (for ex-

ample, TY6, TY12, etc.) which have been assigned a predefined

destination. An F is returned in place of the flag if this is the first

call from the originating device and a P if there have been previous

calls.

%z The module type flag will return the module type of the originating

device if the data switch includes this information in the dialstring

(field l of the fifth line of the dialstring).

%C The server control file (for example, srvtab) or directory name

used.

%H The originating group name truncated to the length of the hot field

of a /var/adm/utmp entry.

%U The user ID mapping file name (for example, dkuidtab) used.

Specification Description