Bugtraq mailing list archives
Re: Wall and talkd pass binary data
From: aem () symbiosis ahp com (a.e.mossberg)
Date: Wed, 20 Jul 1994 09:40:42 -0500 (EDT)
From the desk of Rob Quinn: talkd and walld both pass binary data (on Sun's at least). Here's some source code I got from a friend. I informed Sun about the wall problem several months ago. This source just sends a string to mess up your fonts and such, but I've heard that some terminals have escape sequences that will buffer strings and re-issue them as if the user had typed them (I know there's an expression or term for that, but I can't think of it). I searced for this sequence for xterm, but didn't find one. I didn't look at any other terminal types.
This is a problem which has existed at least a decade and is well known. If you check comp.risks about 1984 or 1985 you'll see an article by me about it, and I was hardly the first. We demonstrated it via "write", or just echo'ing directly to the port, to put it in block mode, clear the screen, send the command we wanted executed, and then send the code to tell the terminal to send the contents of the screen. aem -- Andrew Mossberg Network Administrator & Juggler (305) 597-4110 fax 597-4002
Current thread:
- Re: Wall and talkd pass binary data Bob Page (Jul 19)
- Re: Wall and talkd pass binary data Craig Presson (Jul 20)
- <Possible follow-ups>
- Wall and talkd pass binary data Rob Quinn (Jul 19)
- Flash/talkd Patrick Mcdowell (Jul 20)
- Re: Flash/talkd Eric Wedaa (Jul 20)
- Re: Wall and talkd pass binary data a.e.mossberg (Jul 20)
- Flash/talkd Patrick Mcdowell (Jul 20)
- Re: Wall and talkd pass binary data Martin Sean Bennet - Sun UK - CSG Engineer (Jul 20)
- Re: Sending escape sequences to xterms via wall/talk Mike Raffety (Jul 20)
- Re: Sending escape sequences to xterms via wall/talk Christopher A. Stewart (Jul 20)
- Re: Sending escape sequences to xterms via wall/talk Andrew Beckett (Jul 21)
- setuid root programs and core dumps Rob Quinn (Jul 21)
- Re: Sending escape sequences to xterms via wall/talk Paul Daw (Jul 21)
- Re: Sending escape sequences to xterms via wall/talk Evil Pete (Jul 21)
- Re: Sending escape sequences to xterms via wall/talk Christopher A. Stewart (Jul 21)
- Re: Sending escape sequences to xterms via wall/talk pluvius (Jul 22)
- Re: Sending escape sequences to xterms via wall/talk Mike Raffety (Jul 20)
- Is starting a user program on priv port via inetd dangerous ? Doug McLaren (Jul 21)