Date: Mon, 22 Sep 2003 09:50:01 -0500 (CDT) From: Kirk Strauser <kirk@strauser.com> To: FreeBSD-gnats-submit@FreeBSD.org Subject: bin/57089: "w" does not honor the -n option Message-ID: <200309221450.h8MEo197056129@kanga.honeypot.net> Resent-Message-ID: <200309221500.h8MF0TPe052261@freefall.freebsd.org>
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>Number: 57089
>Category: bin
>Synopsis: "w" does not honor the -n option
>Confidential: no
>Severity: non-critical
>Priority: low
>Responsible: freebsd-bugs
>State: open
>Quarter:
>Keywords:
>Date-Required:
>Class: sw-bug
>Submitter-Id: current-users
>Arrival-Date: Mon Sep 22 08:00:28 PDT 2003
>Closed-Date:
>Last-Modified:
>Originator: Kirk Strauser <kirk@strauser.com>
>Release: FreeBSD 5.1-CURRENT i386
>Organization:
The Strauser Group
>Environment:
System: FreeBSD kanga.honeypot.net 5.1-CURRENT FreeBSD 5.1-CURRENT #0: Fri Sep 19 14:51:41 CDT 2003 root@kanga.honeypot.net:/usr/obj/usr/src/sys/KANGA i386
>Description:
w's -n option is supposed to prevent resolution of the network addresses
that users are connecting from. On my 5.1-CURRENT system, built on
2003-09-19, this is not the case.
w's normal output:
kirk@kanga:~$ w
9:29AM up 2 days, 17:04, 2 users, load averages: 0.42, 0.61, 0.68
USER TTY FROM LOGIN@ IDLE WHAT
kirk p0 pooh 9:22AM - w
kirk p1 pooh 9:23AM - vim /tmp/pf.eAAIb48f
With the -n option to prevent address resolution:
kirk@kanga:~$ w -n
9:29AM up 2 days, 17:04, 2 users, load averages: 0.42, 0.61, 0.68
USER TTY FROM LOGIN@ IDLE WHAT
kirk p0 pooh 9:22AM - w -n
kirk p1 pooh 9:23AM - vim /tmp/pf.eAAIb48f
>How-To-Repeat:
The problem is trivially repeatable; just re-run "w -n".
>Fix:
I don't have a lot of experience with wtmp, but it looks like the default
value for the host field is set by these lines:
strncpy(host_buf, ep->utmp.ut_host, UT_HOSTSIZE);
p = *host_buf ? host_buf : "-";
If the "nflag" variable (set if "-n" is specified at the command line) is
true, then "p" is reset to the value of the resolved address.
However, it seems that the "ep->utmp.ut_host" field is also a string
containing the resolved hostname; "p" is never assigned anything that looks
like a numeric IP.
>Release-Note:
>Audit-Trail:
>Unformatted:
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