From mboxrd@z Thu Jan 1 00:00:00 1970 From: Jeffrey Altman Subject: Re: Serial port redirection Date: Thu, 04 Dec 2003 12:13:49 -0500 Sender: ltsp-discuss-admin-5NWGOfrQmneRv+LV9MX5uipxlwaOVQ5f@public.gmane.org Message-ID: <3FCF6B4D.2050103@columbia.edu> References: <3FCE1101.40502@columbia.edu> <3FCDDEE6.4070905@acm.org> Mime-Version: 1.0 Content-Type: multipart/signed; protocol="application/x-pkcs7-signature"; micalg=sha1; boundary="------------ms080100000807060700020702" Return-path: In-Reply-To: <3FCDDEE6.4070905-HInyCGIudOg@public.gmane.org> Errors-To: ltsp-discuss-admin-5NWGOfrQmneRv+LV9MX5uipxlwaOVQ5f@public.gmane.org List-Unsubscribe: , List-Post: List-Help: List-Subscribe: , List-Archive: To: Corey Minyard Cc: Peter Astrand , ltsp-discuss-5NWGOfrQmneRv+LV9MX5uipxlwaOVQ5f@public.gmane.org, d.sbragion-eDKEdzQQoQ4L5bzFcGmneg@public.gmane.org, linux-serial-u79uwXL29TY76Z2rM5mHXA@public.gmane.org List-Id: linux-serial@vger.kernel.org This is a cryptographically signed message in MIME format. --------------ms080100000807060700020702 Content-Type: text/plain; charset=ISO-8859-1; format=flowed Content-Transfer-Encoding: 7bit Corey Minyard wrote: > Jeffrey Altman wrote: > >> Its not a Kermit bug; If you pass the socket file descriptor to an >> external program >> the external program must understand telnet protocol. Otherwise, it >> can't send the >> correct data format. > > > No, it *is* a kermit bug. When kermit sends an 0xff character, it > needs to escape it per the standard telnet protocol. It's obviously > not doing this. > > -Corey I agree, the IAC must be quoted. The problem is that when an external protocol handler is executed as a child process, Kermit is suspended and the child process has complete control over the socket file descriptor. Kermit is not sitting between the external protocol and the host. Some versions of sz have a command line flag to handle this situation such that IAC (0xff) are not sent but are instead escaped within the zmodem protocol. 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