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Date: Thu, 7 Nov 1996 18:00:04 -0800 (PST)
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To: freebsd-bugs
Cc: 
From: Chris Timmons <skynyrd@tahoma.cwu.edu>
Subject: Re: bin/1973: pppd uses /etc/ppp/options.tty after command line args
Reply-To: Chris Timmons <skynyrd@tahoma.cwu.edu>
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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:
 >