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-.\" 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_OK 3
-.Sh NAME
-.Nm auth_ttyok
-.Nm auth_hostok
-.Nm auth_timeok
-.Nd Functions for checking login class based login restrictions
-.Sh SYNOPSIS
-.Fd #include <sys/types.h>
-.Fd #include <time.h>
-.Fd #include <login_cap.h>
-.Ft int
-.Fn auth_ttyok "login_cap_t *lc" "const char *tty"
-.Ft int
-.Fn auth_hostok "login_cap_t *lc" "const char *host" "char const *ip"
-.Ft int
-.Fn auth_timeok "login_cap_t *lc" "time_t t"
-.Sh DESCRIPTION
-This set of functions checks to see if login is allowed based on login
-class capability entries in the login database,
-.Xr login.conf 5 .
-.Pp
-.Fn auth_ttyok
-checks to see if the named tty is available to users of a specific
-class, and is either in the 
-.Em ttys.allow
-access list, and not in
-the 
-.Em ttys.deny
-access list.
-An empty 
-.Em ttys.allow
-list (or if no such capability exists for
-the give login class) logins via any tty device are allowed unless
-the 
-.Em ttys.deny
-list exists and is non-empty, and the device or its
-tty group (see
-.Xr ttys 5 )
-is not in the list.
-Access to ttys may be allowed or restricted specifically by tty device
-name, a device name which includes a wildcard (e.g. ttyD* or cuaD*),
-or may name a ttygroup, when group=<name> tags have been assigned in
-.Pa /etc/ttys .
-Matching of ttys and ttygroups is case sensitive.
-Passing a 
-.Dv NULL
-or empty string as the
-.Ar tty
-parameter causes the function to return a non-zero value.
-.Pp
-.Fn auth_hostok
-checks for any host restrictions for remote logins.
-The function checks on both a host name and IP address (given in its
-text form, typically n.n.n.n) against the 
-.Em host.allow
-and 
-.Em host.deny
-login class capabilities.
-As with ttys and their groups, wildcards and character classes may be
-used in the host allow and deny capability records.
-The
-.Xr fnmatch 3
-function is used for matching, and the matching on hostnames is case
-insensitive.
-Note that this function expects that the hostname is fully expanded
-(i.e. the local domain name added if necessary) and the IP address
-is in its canonical form.
-No hostname or address lookups are attempted.
-.Pp
-It is possible to call this function with either the hostname or
-the IP address missing (i.e. 
-.Dv NULL )
-and matching will be performed
-only on the basis of the parameter given.
-Passing
-.Dv NULL
-or empty strings in both parameters will result in
-a non-zero return value.
-.Pp
-The
-.Fn auth_timeok
-function checks to see that a given time value is within the
-.Em times.allow
-login class capability and not within the
-.Em times.deny
-access lists.
-An empty or non-existent 
-.Em times.allow
-list allows access at any
-time, except if a given time is falls within a period in the
-.Em times.deny
-list.
-The format of time period records contained in both
-.Em times.allow
-and
-.Em times.deny
-capability fields is explained in detail in the
-.Xr login_times 3
-manual page.
-.Sh RETURN VALUES
-A non-zero return value from any of these functions indicates that
-login access is granted.
-A zero return value means either that the item being tested is not
-in the 
-.Em allow
-access list, or is within the
-.Em deny
-access list.
-.Sh SEE ALSO
-.Xr getcap 3 ,
-.Xr login_cap 3 ,
-.Xr login_class 3 ,
-.Xr login_times 3 ,
-.Xr login.conf 5 ,
-.Xr termcap 5