6b1e5fae2c
The pwcache functions allocate memory, and may return NULL pointers if that allocation fails and the corresponding uid or gid was not found in the local password database. Document this behavior. Sponsored by: Dell EMC Isilon
233 lines
6.6 KiB
Groff
233 lines
6.6 KiB
Groff
.\" $NetBSD: pwcache.3,v 1.17 2008/05/02 18:11:04 martin Exp $
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.\" $FreeBSD$
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.\" Copyright (c) 2002 The NetBSD Foundation, Inc.
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.\" Redistribution and use in source and binary forms, with or without
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.\" modification, are 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, 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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.\"
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.\" THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
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.\" ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
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.\" TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
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.\" PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
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.\" BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
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.\" CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
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.\" SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
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.\" INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
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.\"
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.\" @(#)pwcache.3 8.1 (Berkeley) 6/9/93
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.\"
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.Dd May 5, 2020
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.Dt PWCACHE 3
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.Os
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.Sh NAME
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.Nm pwcache ,
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.Nm user_from_uid ,
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.Nm group_from_gid
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.Nd cache password and group entries
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.Sh LIBRARY
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.Lb libc
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.Sh SYNOPSIS
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.In pwd.h
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.Ft const char *
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.Fn user_from_uid "uid_t uid" "int nouser"
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.Ft int
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.Fn uid_from_user "const char *name" "uid_t *uid"
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.Ft int
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.Fn pwcache_userdb "int (*setpassent)(int)" "void (*endpwent)(void)" "struct passwd * (*getpwnam)(const char *)" "struct passwd * (*getpwuid)(uid_t)"
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.In grp.h
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.Ft const char *
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.Fn group_from_gid "gid_t gid" "int nogroup"
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.Ft int
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.Fn gid_from_group "const char *name" "gid_t *gid"
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.Ft int
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.Fn pwcache_groupdb "int (*setgroupent)(int)" "void (*endgrent)(void)" "struct group * (*getgrnam)(const char *)" "struct group * (*getgrgid)(gid_t)"
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.Sh DESCRIPTION
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The
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.Fn user_from_uid
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function returns the user name associated with the argument
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.Fa uid .
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The user name is cached so that multiple calls with the same
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.Fa uid
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do not require additional calls to
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.Xr getpwuid 3 .
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If there is no user associated with the
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.Fa uid ,
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a pointer is returned
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to a string representation of the
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.Fa uid ,
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unless the argument
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.Fa nouser
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is non-zero, in which case a
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.Dv NULL
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pointer is returned.
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.Pp
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The
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.Fn group_from_gid
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function returns the group name associated with the argument
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.Fa gid .
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The group name is cached so that multiple calls with the same
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.Fa gid
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do not require additional calls to
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.Xr getgrgid 3 .
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If there is no group associated with the
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.Fa gid ,
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a pointer is returned
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to a string representation of the
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.Fa gid ,
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unless the argument
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.Fa nogroup
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is non-zero, in which case a
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.Dv NULL
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pointer is returned.
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.Pp
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The
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.Fn uid_from_user
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function returns the uid associated with the argument
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.Fa name .
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The uid is cached so that multiple calls with the same
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.Fa name
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do not require additional calls to
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.Xr getpwnam 3 .
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If there is no uid associated with the
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.Fa name ,
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the
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.Fn uid_from_user
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function returns \-1; otherwise it stores the uid at the location pointed to by
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.Fa uid
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and returns 0.
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.Pp
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The
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.Fn gid_from_group
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function returns the gid associated with the argument
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.Fa name .
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The gid is cached so that multiple calls with the same
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.Fa name
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do not require additional calls to
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.Xr getgrnam 3 .
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If there is no gid associated with the
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.Fa name ,
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the
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.Fn gid_from_group
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function returns \-1; otherwise it stores the gid at the location pointed to by
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.Fa gid
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and returns 0.
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.Pp
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The
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.Fn pwcache_userdb
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function changes the user database access routines which
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.Fn user_from_uid
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and
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.Fn uid_from_user
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call to search for users.
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The caches are flushed and the existing
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.Fn endpwent
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method is called before switching to the new routines.
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.Fa getpwnam
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and
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.Fa getpwuid
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must be provided, and
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.Fa setpassent
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and
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.Fa endpwent
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may be
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.Dv NULL
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pointers.
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.Pp
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The
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.Fn pwcache_groupdb
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function changes the group database access routines which
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.Fn group_from_gid
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and
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.Fn gid_from_group
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call to search for groups.
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The caches are flushed and the existing
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.Fn endgrent
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method is called before switching to the new routines.
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.Fa getgrnam
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and
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.Fa getgrgid
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must be provided, and
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.Fa setgroupent
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and
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.Fa endgrent
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may be
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.Dv NULL
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pointers.
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.Sh ERRORS
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If insufficient memory is available,
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.Fn user_from_uid
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and
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.Fn group_from_gid
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may return NULL pointers.
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.Va errno
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is set to
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.Er ENOMEM .
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.Sh SEE ALSO
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.Xr getgrgid 3 ,
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.Xr getgrnam 3 ,
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.Xr getpwnam 3 ,
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.Xr getpwuid 3
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.Sh HISTORY
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The
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.Fn user_from_uid
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and
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.Fn group_from_gid
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functions first appeared in
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.Bx 4.4 .
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.Pp
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The
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.Fn uid_from_user
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and
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.Fn gid_from_group
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functions first appeared in
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.Nx 1.4 .
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.Pp
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The
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.Fn pwcache_userdb
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and
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.Fn pwcache_groupdb
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functions first appeared in
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.Nx 1.6
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and
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.Fx 10.0 .
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