223 lines
6.0 KiB
Groff
223 lines
6.0 KiB
Groff
.\" Copyright (c) 1988, 1991, 1993
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.\" The Regents of the University of California. 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, 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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.\" 3. All advertising materials mentioning features or use of this software
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.\" must display the following acknowledgement:
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.\" This product includes software developed by the University of
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.\" California, Berkeley and its contributors.
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.\" 4. Neither the name of the University nor the names of its contributors
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.\" may be used to endorse or promote products derived from this software
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.\" without specific prior written permission.
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.\"
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.\" THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
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.\" ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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.\" IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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.\" ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
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.\" FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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.\" DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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.\" OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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.\" HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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.\" LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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.\" OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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.\" SUCH DAMAGE.
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.\"
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.\" From: @(#)getpwent.3 8.2 (Berkeley) 12/11/93
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.\" $FreeBSD$
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.\"
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.Dd September 20, 1994
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.Dt GETPWENT 3
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.Os
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.Sh NAME
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.Nm getpwent ,
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.Nm getpwnam ,
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.Nm getpwuid ,
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.Nm setpassent ,
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.Nm setpwent ,
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.Nm endpwent
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.Nd password database operations
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.Sh LIBRARY
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.Lb libc
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.Sh SYNOPSIS
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.Fd #include <sys/types.h>
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.Fd #include <pwd.h>
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.Ft struct passwd *
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.Fn getpwent void
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.Ft struct passwd *
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.Fn getpwnam "const char *login"
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.Ft struct passwd *
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.Fn getpwuid "uid_t uid"
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.Ft int
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.Fn setpassent "int stayopen"
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.Ft void
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.Fn setpwent void
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.Ft void
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.Fn endpwent void
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.Sh DESCRIPTION
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These functions
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operate on the password database file
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which is described
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in
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.Xr passwd 5 .
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Each entry in the database is defined by the structure
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.Ar passwd
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found in the include
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file
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.Aq Pa pwd.h :
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.Bd -literal -offset indent
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struct passwd {
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char *pw_name; /* user name */
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char *pw_passwd; /* encrypted password */
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uid_t pw_uid; /* user uid */
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gid_t pw_gid; /* user gid */
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time_t pw_change; /* password change time */
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char *pw_class; /* user access class */
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char *pw_gecos; /* Honeywell login info */
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char *pw_dir; /* home directory */
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char *pw_shell; /* default shell */
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time_t pw_expire; /* account expiration */
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int pw_fields; /* internal: fields filled in */
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};
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.Ed
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.Pp
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The functions
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.Fn getpwnam
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and
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.Fn getpwuid
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search the password database for the given login name or user uid,
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respectively, always returning the first one encountered.
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.Pp
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The
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.Fn getpwent
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function
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sequentially reads the password database and is intended for programs
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that wish to process the complete list of users.
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.Pp
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The
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.Fn setpassent
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function
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accomplishes two purposes.
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First, it causes
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.Fn getpwent
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to ``rewind'' to the beginning of the database.
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Additionally, if
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.Fa stayopen
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is non-zero, file descriptors are left open, significantly speeding
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up subsequent accesses for all of the routines.
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(This latter functionality is unnecessary for
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.Fn getpwent
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as it doesn't close its file descriptors by default.)
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.Pp
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It is dangerous for long-running programs to keep the file descriptors
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open as the database will become out of date if it is updated while the
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program is running.
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.Pp
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The
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.Fn setpwent
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function
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is identical to
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.Fn setpassent
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with an argument of zero.
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.Pp
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The
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.Fn endpwent
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function
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closes any open files.
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.Pp
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These routines have been written to ``shadow'' the password file, e.g.
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allow only certain programs to have access to the encrypted password.
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If the process which calls them has an effective uid of 0, the encrypted
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password will be returned, otherwise, the password field of the returned
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structure will point to the string
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.Ql * .
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.Sh YP/NIS INTERACTION
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When the
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.Xr yp 4
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password database is enabled, the
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.Fn getpwnam
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and
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.Fn getpwuid
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functions use the YP maps
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.Dq Li passwd.byname
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and
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.Dq Li passwd.byuid ,
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respectively, if the requested password entry is not found in the
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local database. The
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.Fn getpwent
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function will step through the YP map
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.Dq Li passwd.byname
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if the entire map is enabled as described in
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.Xr passwd 5 .
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.Sh RETURN VALUES
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The functions
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.Fn getpwent ,
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.Fn getpwnam ,
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and
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.Fn getpwuid ,
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return a valid pointer to a passwd structure on success
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and a null pointer if end-of-file is reached or an error occurs.
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The
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.Fn setpassent
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function returns 0 on failure and 1 on success.
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The
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.Fn endpwent
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and
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.Fn setpwent
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functions
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have no return value.
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.Sh FILES
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.Bl -tag -width /etc/master.passwd -compact
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.It Pa /etc/pwd.db
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The insecure password database file
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.It Pa /etc/spwd.db
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The secure password database file
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.It Pa /etc/master.passwd
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The current password file
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.It Pa /etc/passwd
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A Version 7 format password file
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.El
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.Sh SEE ALSO
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.Xr getlogin 2 ,
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.Xr getgrent 3 ,
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.Xr yp 4 ,
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.Xr passwd 5 ,
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.Xr pwd_mkdb 8 ,
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.Xr vipw 8
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.Sh HISTORY
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The
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.Fn getpwent ,
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.Fn getpwnam ,
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.Fn getpwuid ,
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.Fn setpwent,
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and
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.Fn endpwent
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functions appeared in
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.At v7 .
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The
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.Fn setpassent
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function appeared in
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.Bx 4.3 Reno .
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.Sh COMPATIBILITY
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The historic function
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.Xr setpwfile 3 ,
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which allowed the specification of alternate password databases,
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has been deprecated and is no longer available.
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.Sh BUGS
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The functions
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.Fn getpwent ,
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.Fn getpwnam ,
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and
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.Fn getpwuid ,
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leave their results in an internal static object and return
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a pointer to that object.
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Subsequent calls to
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the same function
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will modify the same object.
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