Date: Thu, 7 Nov 1996 18:00:04 -0800 (PST) From: Chris Timmons <skynyrd@tahoma.cwu.edu> To: freebsd-bugs Subject: Re: bin/1973: pppd uses /etc/ppp/options.tty after command line args Message-ID: <199611080200.SAA27501@freefall.freebsd.org>
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The following reply was made to PR bin/1973; it has been noted by GNATS.
From: Chris Timmons <skynyrd@tahoma.cwu.edu>
To: gurney_j@efn.org
Cc: FreeBSD-gnats@freefall.freebsd.org,
GNATS Management <gnats@freefall.freebsd.org>,
freebsd-bugs@freefall.freebsd.org
Subject: Re: bin/1973: pppd uses /etc/ppp/options.tty after command line args
Date: Thu, 7 Nov 1996 17:47:59 -0800 (PST)
Hmmm... smells like a feature to me. From pppd(8):
/etc/ppp/options.ttyname
System default options for the serial port being
used, read after command-line options.
... which leads me to believe that the intention is to provide a mechanism
whereby the system administrator can lock-down certain options, like the
IP address that a normal user can't override.
If your change is committed, how else might an adminstrator lock down
options?
-Chris
On Thu, 7 Nov 1996, John-Mark Gurney wrote:
>
> >Number: 1973
> >Category: bin
> >Synopsis: pppd uses /etc/ppp/options.tty after command line args
> >Confidential: no
> >Severity: serious
> >Priority: medium
> >Responsible: freebsd-bugs
> >State: open
> >Class: sw-bug
> >Submitter-Id: current-users
> >Arrival-Date: Thu Nov 7 15:00:01 PST 1996
> >Last-Modified:
> >Originator: John-Mark Gurney
> >Organization:
> Cu Networking
> >Release: FreeBSD 2.2-960801-SNAP i386
> >Environment:
>
> a ppp server that is doing "dynamic" ip via /etc/ppp/options.tty files and
> wants to allow some others to connect a network overriding the ip address
> in options.tty file on the command line...
>
> machine is a cut down termserver
>
>
> >Description:
>
> when you try to override options that are specified in options.<tty> from the
> command line you find you can't...
>
>
>
> >How-To-Repeat:
>
> create a /etc/ppp/options.<tty> file with something like
> :1.2.3.4
> and then run:
> pppd :1.2.3.5
> you will find that when you connect you will end up with 1.2.3.4 as your ip
> address instead of 1.2.3.5... which you would expect...
>
>
> >Fix:
>
> apply this patch... (basicly swap reading sequence of options:
>
> Index: main.c
> ===================================================================
> RCS file: /usr/cvs/src/usr.sbin/pppd/main.c,v
> retrieving revision 1.5
> diff -c -r1.5 main.c
> *** main.c 1995/10/31 21:21:26 1.5
> --- main.c 1996/11/07 10:19:59
> ***************
> *** 191,198 ****
>
> if (!options_from_file(_PATH_SYSOPTIONS, REQ_SYSOPTIONS, 0) ||
> !options_from_user() ||
> ! !parse_args(argc-1, argv+1) ||
> ! !options_for_tty())
> die(1);
> check_auth_options();
> setipdefault();
> --- 191,198 ----
>
> if (!options_from_file(_PATH_SYSOPTIONS, REQ_SYSOPTIONS, 0) ||
> !options_from_user() ||
> ! !options_for_tty() ||
> ! !parse_args(argc-1, argv+1))
> die(1);
> check_auth_options();
> setipdefault();
>
>
> >Audit-Trail:
> >Unformatted:
>
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