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