>Number:         4425
>Category:       bin
>Synopsis:       "telnet -E" doesn't ignore all characters
>Confidential:   no
>Severity:       serious
>Priority:       medium
>Responsible:    bin-bug-people (Utility Bug People)
>State:          open
>Class:          sw-bug
>Submitter-Id:   net
>Arrival-Date:   Mon Nov  3 23:50:04 1997
>Last-Modified:
>Originator:     
>Organization:
Ericsson Radio Systems AB
>Release:        NetBSD-1.3_ALPHA from 971027
>Environment:
System: NetBSD abro 1.3_ALPHA NetBSD 1.3_ALPHA (ABRO) #0: Fri Oct 31 13:05:42 MET 1997 eramer@abro:/usr/src/sys/arch/sparc/compile/ABRO sparc

>Description:

"telnet -E" is supposed to turn off the escape character handling. In
spite of this, \377 (M-DEL) will be recognised as an escape character.

>How-To-Repeat:

% telnet -E -8 localhost
<Send \377 and see telnet go into command mode>

>Fix:

This fix is for /usr/src/usr.bin/telnet. Probably,
/usr/src/domestic/usr.bin/telnet will have to be patched as well, but
what do I know? :-)

*** telnet.c.orig	Tue Jun  3 13:26:09 1997
--- telnet.c	Sun Nov  2 20:30:17 1997
***************
*** 1991,1997 ****
  		}
  		if ((sc == '\n') || (sc == '\r'))
  			bol = 1;
! 	} else if (sc == escape) {
  	    /*
  	     * Double escape is a pass through of a single escape character.
  	     */
--- 1991,1997 ----
  		}
  		if ((sc == '\n') || (sc == '\r'))
  			bol = 1;
! 	} else if (sc == escape && escape != _POSIX_VDISABLE) {
  	    /*
  	     * Double escape is a pass through of a single escape character.
  	     */
>Audit-Trail:
>Unformatted: