This will make a number of things easier in the future, as well as (finally!) avoiding the Id-smashing problem which has plagued developers for so long. Boy, I'm glad we're not using sup anymore. This update would have been insane otherwise.
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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.\" $FreeBSD$
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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 login.conf 5 ,
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.Xr login_cap 3 ,
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.Xr login_class 3 ,
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.Xr termcap 5 ,
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.Xr getcap 3
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