History log of /freebsd-11-stable/libexec/getty/chat.c
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# 344126 14-Feb-2019 se

MFC r343479: Fix potential buffer overflow and undefined behavior.

The buffer allocated in read_chat() could be 1 element too short, if the
chatstr parameter passed in is 1 or 3 charachters long (e.g. "a" or "a b").
The allocation of the pointer array does not account for the terminating
NULL pointer in that case.

Overlapping source and destination strings are undefined in strcpy().
Instead of moving a string to the left by one character just increment the
char pointer before it is assigned to the results array.


# 302408 07-Jul-2016 gjb

Copy head@r302406 to stable/11 as part of the 11.0-RELEASE cycle.
Prune svn:mergeinfo from the new branch, as nothing has been merged
here.

Additional commits post-branch will follow.

Approved by: re (implicit)
Sponsored by: The FreeBSD Foundation


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# 228582 16-Dec-2011 dim

In libexec/getty/chat.c, replace && with & in chat_send(). The intent
is to test if the CHATDEBUG_SEND bit is set in the chat_debug global.

MFC after: 1 week


# 216582 20-Dec-2010 charnier

Add __unused. Ansi prototypes.


# 144716 06-Apr-2005 stefanf

Include gettytab.h before extern.h so that the declarations of struct
gettyflags, gettynums and gettystrs are available.


# 126952 14-Mar-2004 bde

Fixed a misspelling of 0 as NULL.


# 108470 30-Dec-2002 schweikh

Fix typos, mostly s/ an / a / where appropriate and a few s/an/and/
Add FreeBSD Id tag where missing.


# 91214 25-Feb-2002 bde

Removed unused include of <sys/resource.h> instead of depending on
namespace pollution only 1 layer deep in <sys/stat.h> for its
prerequisite <sys/time.h>

Removed other unused includes.


# 90301 06-Feb-2002 imp

o __P removal
o remove register
o use strict prototypes


# 50476 27-Aug-1999 peter

$Id$ -> $FreeBSD$


# 31331 21-Nov-1997 charnier

Correct incompletes .Xrs. Remove duplicate #includes and unused variables.


# 29003 01-Sep-1997 davidn

Use cgetustr() since we handled special escapes ourselves.
Fix typo in escape parsing function.
PR: 4370
Submitted by: sumii@is.s.u-tokyo.ac.jp


# 22989 22-Feb-1997 peter

Revert $FreeBSD$ to $Id$


# 22491 09-Feb-1997 davidn

Tidy-up modem-chat handling: ensure tty modes are restored to
'sane' standard (not raw) settings before abort/exiting; move
responsibility of setting raw mode for chat-handling out of
chat.c to avoid doing redundant tc{s,g}etattr()s; move DE
pause prior setting standard mode before issue/login prompt to
avoid echoing modem connect strings. Fixed up comment styles
in a couple of places.


# 22208 02-Feb-1997 davidn

Added:
ic=expect/send script modem init script
ac=expect/send script modem answer script
ct#val chat script timeout (seconds)
rt#val recycle timeout (seconds) if 'ac' set
dc#val debug bitmask for debugging chat scripts
hw (boolean) enable crtscts handshaking
if=path 'issue' file sent prior login prompt

chat.c is a simplistic expect/send chat module.