Package: netcat-openbsd
Version: 1.219-1
Severity: normal
X-Debbugs-Cc: uklei...@debian.org
Hello,
if netcat is talking to a remote peer that implements a telnet-like
protocol (e.g. rfc2217 in my case), IAC should be quoted. That is
printf '01234\xff\xfb\x015678' | nc -t ::1 12345
should actually send
01234\xff\xff\xfb\x015678
because otherwise the stream is interpreted on the other side as a
command. On the receiving side the matching unquoting should happen.
(Look at the effect if the other side happens to be
nc -t -l :: 12345
. The problem is that nc assumes it never sent a WILL request and so
should safely reply to the DONT reply with a WONT. The fix is to quote
the IAC such that the assumption "nc never sent a WILL request" becomes
true. See https://www.rfc-editor.org/rfc/rfc854, GENERAL CONSIDERATIONS
for more details.)
Best regards
Uwe
