674b952dc4
As peter@ points out in pr/220953: "rwho, rwhod and ruptime are not part of the remote login suite (rsh, rlogin etc). They should *not* be in the rcmds package which is disabled by default. We rely on rwho/rwhod/ruptime in the freebsd.org cluster." This commit is a re-commit of r322029 and r322031 with a better commit log, as pointed out by ngie@. This also includes the necesary changes to OptionalObsoleteFiles.inc, as requested by jhb@. PR: 220953 Reported by: peter@, jhb@ Differential Revision: https://reviews.freebsd.org/D11743
240 lines
6.5 KiB
Groff
240 lines
6.5 KiB
Groff
.\" Copyright (c) 1983, 1991, 1993
|
|
.\" The Regents of the University of California. All rights reserved.
|
|
.\"
|
|
.\" Redistribution and use in source and binary forms, with or without
|
|
.\" modification, are permitted provided that the following conditions
|
|
.\" are met:
|
|
.\" 1. Redistributions of source code must retain the above copyright
|
|
.\" notice, 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. Neither the name of the University nor the names of its contributors
|
|
.\" may be used to endorse or promote products derived from this software
|
|
.\" without specific prior written permission.
|
|
.\"
|
|
.\" THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
|
|
.\" ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
|
|
.\" IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
|
|
.\" ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
|
|
.\" FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
|
|
.\" DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
|
|
.\" OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
|
|
.\" HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
|
|
.\" LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
|
|
.\" OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
|
|
.\" SUCH DAMAGE.
|
|
.\"
|
|
.\" @(#)rwhod.8 8.2 (Berkeley) 12/11/93
|
|
.\" $FreeBSD$
|
|
.\"
|
|
.Dd July 3, 2017
|
|
.Dt RWHOD 8
|
|
.Os
|
|
.Sh NAME
|
|
.Nm rwhod
|
|
.Nd system status server
|
|
.Sh SYNOPSIS
|
|
.Nm
|
|
.Op Fl i
|
|
.Op Fl p
|
|
.Op Fl l
|
|
.Op Fl m Op Ar ttl
|
|
.Sh DESCRIPTION
|
|
The
|
|
.Nm
|
|
utility is the server which maintains the database used by the
|
|
.Xr rwho 1
|
|
and
|
|
.Xr ruptime 1
|
|
programs.
|
|
Its operation is predicated on the ability to
|
|
.Em broadcast
|
|
or
|
|
.Em multicast
|
|
messages on a network.
|
|
.Pp
|
|
The
|
|
.Nm
|
|
utility operates as both a producer and consumer of status information,
|
|
unless the
|
|
.Fl l
|
|
(listen mode) option is specified, in which case
|
|
it acts as a consumer only.
|
|
As a producer of information it periodically
|
|
queries the state of the system and constructs
|
|
status messages which are broadcasted or multicasted on a network.
|
|
As a consumer of information, it listens for other
|
|
.Nm
|
|
servers' status messages, validating them, then recording
|
|
them in a collection of files located in the directory
|
|
.Pa /var/rwho .
|
|
.Pp
|
|
The following options are available:
|
|
.Bl -tag -width indent
|
|
.It Fl i
|
|
Enable insecure mode, which causes
|
|
.Nm
|
|
to ignore the source port on incoming packets.
|
|
.It Fl p
|
|
Ignore all
|
|
.Dv POINTOPOINT
|
|
interfaces.
|
|
This is useful if you do not wish to keep dial on demand
|
|
interfaces permanently active.
|
|
.It Fl l
|
|
Enable listen mode, which causes
|
|
.Nm
|
|
to not broadcast any information.
|
|
This allows you to monitor other machines'
|
|
.Nm
|
|
information, without broadcasting your own.
|
|
.It Fl m Op Ar ttl
|
|
Cause
|
|
.Nm
|
|
to use IP multicast (instead of
|
|
broadcast) on all interfaces that have
|
|
the IFF_MULTICAST flag set in their "ifnet" structs
|
|
(excluding the loopback interface).
|
|
The multicast
|
|
reports are sent with a time-to-live of 1, to prevent
|
|
forwarding beyond the directly-connected subnet(s).
|
|
.Pp
|
|
If the optional
|
|
.Ar ttl
|
|
argument is supplied with the
|
|
.Fl m
|
|
flag,
|
|
.Nm
|
|
will send IP multicast datagrams with a
|
|
time-to-live of
|
|
.Ar ttl ,
|
|
via a SINGLE interface rather
|
|
than all interfaces.
|
|
.Ar ttl
|
|
must be between 0 and
|
|
32 (or MAX_MULTICAST_SCOPE).
|
|
Note that
|
|
.Fl m Ar 1
|
|
is different from
|
|
.Fl m ,
|
|
in that
|
|
.Fl m Ar 1
|
|
specifies transmission on one interface only.
|
|
.Pp
|
|
When
|
|
.Fl m
|
|
is used without a
|
|
.Ar ttl
|
|
argument, the program accepts multicast
|
|
.Nm
|
|
reports from all multicast-capable interfaces.
|
|
If a
|
|
.Ar ttl
|
|
argument is given, it accepts multicast reports from only one interface, the
|
|
one on which reports are sent (which may be controlled via the host's routing
|
|
table).
|
|
Regardless of the
|
|
.Fl m
|
|
option, the program accepts broadcast or
|
|
unicast reports from all interfaces.
|
|
Thus, this program will hear the
|
|
reports of old, non-multicasting
|
|
.Nm Ns s ,
|
|
but, if multicasting is used,
|
|
those old
|
|
.Nm Ns s
|
|
will not hear the reports generated by this program.
|
|
.El
|
|
.Pp
|
|
The server transmits and receives messages at the port indicated
|
|
in the ``who'' service specification; see
|
|
.Xr services 5 .
|
|
The messages sent and received, are of the form:
|
|
.Bd -literal -offset indent
|
|
struct outmp {
|
|
char out_line[8]; /* tty name */
|
|
char out_name[8]; /* user id */
|
|
long out_time; /* time on */
|
|
};
|
|
|
|
struct whod {
|
|
char wd_vers;
|
|
char wd_type;
|
|
char wd_fill[2];
|
|
int wd_sendtime;
|
|
int wd_recvtime;
|
|
char wd_hostname[32];
|
|
int wd_loadav[3];
|
|
int wd_boottime;
|
|
struct whoent {
|
|
struct outmp we_utmp;
|
|
int we_idle;
|
|
} wd_we[1024 / sizeof (struct whoent)];
|
|
};
|
|
.Ed
|
|
.Pp
|
|
All fields are converted to network byte order prior to
|
|
transmission.
|
|
The load averages are as calculated by the
|
|
.Xr w 1
|
|
program, and represent load averages over the 5, 10, and 15 minute
|
|
intervals prior to a server's transmission; they are multiplied by 100
|
|
for representation in an integer.
|
|
The host name
|
|
included is that returned by the
|
|
.Xr gethostname 3
|
|
system call, with any trailing domain name omitted.
|
|
The array at the end of the message contains information about
|
|
the users logged in to the sending machine.
|
|
This information
|
|
includes the contents of the entry from the user accounting database
|
|
for each non-idle terminal line and a value indicating the
|
|
time in seconds since a character was last received on the terminal line.
|
|
.Pp
|
|
Messages received by the
|
|
.Nm rwho
|
|
server are discarded unless they originated at an
|
|
.Nm rwho
|
|
server's port or the
|
|
.Fl i
|
|
option was specified.
|
|
In addition, if the host's name, as specified
|
|
in the message, contains any unprintable
|
|
.Tn ASCII
|
|
characters, the
|
|
message is discarded.
|
|
Valid messages received by
|
|
.Nm
|
|
are placed in files named
|
|
.Pa whod.hostname
|
|
in the directory
|
|
.Pa /var/rwho .
|
|
These files contain only the most recent message, in the
|
|
format described above.
|
|
.Pp
|
|
Status messages are generated approximately once every
|
|
3 minutes.
|
|
The
|
|
.Nm
|
|
utility performs an
|
|
.Xr nlist 3
|
|
on
|
|
.Pa /boot/kernel/kernel
|
|
every 30 minutes to guard against
|
|
the possibility that this file is not the system
|
|
image currently operating.
|
|
.Sh SEE ALSO
|
|
.Xr ruptime 1 ,
|
|
.Xr rwho 1
|
|
.Sh HISTORY
|
|
The
|
|
.Nm
|
|
utility appeared in
|
|
.Bx 4.2 .
|
|
.Sh BUGS
|
|
Status information should be sent only upon request rather than continuously.
|
|
People often interpret the server dying
|
|
or network communication failures
|
|
as a machine going down.
|