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One of the things I really want to do, is to get rid of the limitations of our current utmp(5) mechanism: - It only allows 8 byte TTY device names. - The hostname only allows 16 bytes of storage. I'm not a big fan of <utmpx.h>, but I think we should at least try to add parts of it. Unfortunately we cannot implement <utmpx.h>, because we miss various fields, such as ut_id, ut_pid, etc. The API provided by libulog shares some similarities with <utmpx.h>, so it shouldn't be too hard to port these applications eventually. In most simple cases, it should just be a matter of removing the ulog_ prefix everywhere. As a bonus, it also implements a function called ulog_login_pseudo(), which allows unprivileged applications to write log entries, provided they have a valid file descriptor to a pseudo-terminal master device. libulog will allow a smoother transition to a new file format by adding a library interface to deal with utmp/wtmp/lastlog files. I initially thought about adding the functionality to libutil, but because I'm not planning on keeping this library around forever, we'd better keep it separated. Next items on the todo list: 1. Port applications in the base system (and ports) to libulog, instead of letting them use <utmp.h>. 2. Remove <utmp.h>, implement <utmpx.h> and reimplement this library on top. 3. Port as many applications as possible back to <utmpx.h>.
103 lines
2.9 KiB
Groff
103 lines
2.9 KiB
Groff
.\" Copyright (c) 2009 Ed Schouten <ed@FreeBSD.org>
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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, 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 AUTHOR 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 AUTHOR 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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.\" $FreeBSD$
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.\"
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.Dd December 2, 2009
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.Os
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.Dt ULOG_LOGIN 3
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.Sh NAME
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.Nm ulog_login ,
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.Nm ulog_login_pseudo ,
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.Nm ulog_logout ,
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.Nm ulog_logout_pseudo
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.Nd manage user login records
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.Sh LIBRARY
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.Lb libulog
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.Sh SYNOPSIS
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.In ulog.h
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.Ft void
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.Fn ulog_login "const char *line" "const char *user" "const char *host"
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.Ft void
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.Fn ulog_login_pseudo "int fd" "const char *host"
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.Ft void
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.Fn ulog_logout "const char *line"
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.Ft void
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.Fn ulog_logout_pseudo "int fd"
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.Sh DESCRIPTION
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The
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.Fn ulog_login
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and
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.Fn ulog_login_pseudo
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functions register a login session on a TTY.
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The
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.Fn ulog_login
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function adds an entry for TTY
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.Fa line
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and username
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.Fa user .
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The
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.Fn ulog_login_pseudo
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function uses file descriptor to a pseudo-terminal master device
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.Fa fd
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to determine the TTY name, while using the username belonging to the
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real user ID of the calling process.
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The optional
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.Fa host
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argument denotes a remote hostname, in case the login session is
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provided by a network service.
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.Pp
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The
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.Fn ulog_logout
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and
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.Fn ulog_logout_pseudo
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functions mark the previously registered login session as being
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terminated.
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.Pp
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Because the
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.Fa line
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and
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.Fa user
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arguments of
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.Fn ulog_login
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and
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.Fn ulog_logout
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cannot be trusted, these functions require administrative privileges.
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The
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.Fn ulog_login_pseudo
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and
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.Fn ulog_logout_pseudo
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functions spawn a privileged process to perform the actual logging.
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.Sh SEE ALSO
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.Xr getuid 3 ,
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.Xr login 3 ,
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.Xr logout 3 ,
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.Xr posix_openpt 2 ,
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.Xr ptsname 3 ,
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.Xr ulog_getutxent 3 ,
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.Xr utmp 5
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.Sh HISTORY
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These functions appeared in
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.Fx 9.0 .
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