156 lines
4.8 KiB
Groff
156 lines
4.8 KiB
Groff
.\" Copyright (c) 1995 David Nugent <davidn@blaze.net.au>
|
|
.\" All rights reserved.
|
|
.\"
|
|
.\" Redistribution and use in source and binary forms, with or without
|
|
.\" modification, is permitted provided that the following conditions
|
|
.\" are met:
|
|
.\" 1. Redistributions of source code must retain the above copyright
|
|
.\" notice immediately at the beginning of the file, without modification,
|
|
.\" this list of conditions, and the following disclaimer.
|
|
.\" 2. Redistributions in binary form must reproduce the above copyright
|
|
.\" notice, this list of conditions and the following disclaimer in the
|
|
.\" documentation and/or other materials provided with the distribution.
|
|
.\" 3. This work was done expressly for inclusion into FreeBSD. Other use
|
|
.\" is permitted provided this notation is included.
|
|
.\" 4. Absolutely no warranty of function or purpose is made by the author
|
|
.\" David Nugent.
|
|
.\" 5. Modifications may be freely made to this file providing the above
|
|
.\" conditions are met.
|
|
.\"
|
|
.\" $Id$
|
|
.\"
|
|
.Dd January 2, 1997
|
|
.Os FreeBSD
|
|
.Dt LOGIN_TIMES 3
|
|
.Sh NAME
|
|
.Nm parse_lt
|
|
.Nm in_ltm
|
|
.Nm in_ltms
|
|
.Nd Functions for parsing and checking login time periods
|
|
.Sh SYNOPSIS
|
|
.Fd #include <sys/types.h>
|
|
.Fd #include <time.h>
|
|
.Fd #include <login_cap.h>
|
|
.Ft login_time_t
|
|
.Fn parse_lt "const char *str"
|
|
.Ft int
|
|
.Fn in_ltm "const login_time_t *lt" "struct tm *t" "time_t *ends"
|
|
.Ft int
|
|
.Fn in_ltms "const login_time_t *lt" "struct tm *t" "time_t *ends"
|
|
.Sh DESCRIPTION
|
|
This set of functions may be used for parsing and checking login and
|
|
session times against a predefined list of allowed login times as
|
|
used in
|
|
.Xr login.conf 5 .
|
|
.Pp
|
|
The format of allowed and disallowed session times specified in the
|
|
.Ar times.allow
|
|
and
|
|
.Ar times.deny
|
|
capability fields in a login class are comprised of a prefix which
|
|
specifies one or more 2- or 3-character day codes, followed by
|
|
a start and end time in 24 hour format separated by a hyphen.
|
|
Day codes may be concatenated together to select specific days, or
|
|
the special mnemonics "Any" and "All" (for any/all days of the week),
|
|
"Wk" for any day of the week (excluding Saturdays and Sundays) and
|
|
"Wd" for any weekend day may be used.
|
|
.Pp
|
|
For example, the following time period:
|
|
.Dl MoThFrSa1400-2200
|
|
is interpreted as Monday, Thursday through Saturday between the hours
|
|
of 2pm and 10pm.
|
|
.Dl Wd0600-1800
|
|
means Saturday and Sunday, between the hours of 6am through 6pm, and
|
|
.Dl Any0400-1600
|
|
means any day of the week, between 4am and 4pm.
|
|
.Pp
|
|
Note that all time periods reference system local time.
|
|
.Pp
|
|
The
|
|
.Fn parse_lt
|
|
function converts the ascii representation of a time period into
|
|
a structure of type
|
|
.Ft login_time_t .
|
|
This is defined as:
|
|
.Bd -literal
|
|
typedef struct login_time
|
|
{
|
|
u_short lt_start; /* Start time */
|
|
u_short lt_end; /* End time */
|
|
u_char lt_dow; /* Days of week */
|
|
} login_time_t;
|
|
.Ed
|
|
.Pp
|
|
The
|
|
.Ar lt_start
|
|
and
|
|
.Ar lt_end
|
|
fields contain the number of minutes past midnight at which the
|
|
described period begins and ends.
|
|
The
|
|
.Ar lt_dow
|
|
field is a bit field, containing one bit for each day of the week
|
|
and one bit unused.
|
|
A series
|
|
.Em LTM_*
|
|
macros may be used for testing bits individually and in combination.
|
|
If no bits are set in this field - ie. it contains the value
|
|
.Em LTM_NONE -
|
|
then the entire period is assumed invalid.
|
|
This is used as a convention to mark the termination of an array
|
|
of login_time_t values.
|
|
If
|
|
.Fn parse_lt
|
|
returns a
|
|
.Ar login_time_t
|
|
with
|
|
.Ar lt_dow
|
|
equal to
|
|
.Em LTM_NONE
|
|
then a parsing error was encountered.
|
|
.Pp
|
|
The remaining functions provide the ability to test a given time_t or
|
|
struct tm value against a specific time period or array of time
|
|
periods.
|
|
.Fn in_ltm
|
|
determines whether the given time described by the struct tm
|
|
passed as the second parameter falls within the period described
|
|
by the first parameter.
|
|
A boolean value is returned, indicating whether or not the time
|
|
specified falls within the period.
|
|
If the time does fall within the time period, and the third
|
|
parameter to the function is not NULL, the time at which the
|
|
period ends relative to the time passed is returned.
|
|
.Pp
|
|
The
|
|
.Fn in_ltms
|
|
function is similar to
|
|
.Fn in_ltm
|
|
except that the first parameter must be a pointer to an array
|
|
of login_time_t objects, which is up to LC_MAXTIMES (64)
|
|
elements in length, and terminated by an element with its
|
|
.Ar lt_dow
|
|
field set to
|
|
.Em LTM_NONE.
|
|
.Sh RETURN VALUES
|
|
.Fn parse_lt
|
|
returns a filled in structure of type login_time_t containing the
|
|
parsed time period.
|
|
If a parsing error occurs, the lt_dow field is set to
|
|
.Em LTM_NONE
|
|
(i.e. 0).
|
|
.Pp
|
|
.Fn in_ltm
|
|
returns non-zero if the given time falls within the period described
|
|
by the login_time_t passed as the first parameter.
|
|
.Pp
|
|
.Fn in_ltms
|
|
returns the index of the first time period found in which the given
|
|
time falls, or -1 if none of them apply.
|
|
.Sh SEE ALSO
|
|
.Xr login.conf 5 ,
|
|
.Xr login_cap 3 ,
|
|
.Xr login_class 3 ,
|
|
.Xr termcap 5 ,
|
|
.Xr getcap 3
|