nancy@resonex.UUCP (Nancy Blachman) (02/21/85)
When we are running experiments where we are collecting huge amounts
of data, we would prefer not to have news or uucp running because
they slow down the system.
Do you have any recommendations on how to block news and uucp?
At the moment, I have a routine called block_calls, which disables
write permission on /usr/spool/uucp, so files can't be written
to the spool directory. After the experiment is done, we turn
write permission back on.
Is there a better way of handling this? By the way, I do not want
to disconnect the modems because I want users to be able to dial up
the computer remotely.
--
/\//\//\//\//\//\//\//\//\//\//\//\//\//\//\//\//\//\//\//\//\//\//\//\//\//\/
Nancy Blachman UUCP: {allegra,hplabs,ihnp4,ucbvax!sun}!resonex!nancy
(408)720 8600 x37 ARPA: sun!resonex!nancy@ucbvax.ARPAdave@uwvax.UUCP (Dave Cohrs) (02/22/85)
> When we are running experiments where we are collecting huge amounts > of data, we would prefer not to have news or uucp running because > they slow down the system. > > Do you have any recommendations on how to block news and uucp? How about changing the password for 'uucp' or changing the login name to something else temporarily? This way, you can guarantee that uucp can't even log in. You could easily make a shellscript to do this, and also fix things so your uucp can't run either (turn off polling or whatever is necessary). It seems that if you stop up the queue directory, there could easily be lossage of news/mail. When we lose things here, especially mail, I get very redfaced, and I feel you would also. -- dave cohrs ...!{allegra,harvard,ihnp4,seismo}!uwvax!dave dave@wisc-rsch.arpa (bug? what bug? that's a feature!)
chuqui@nsc.UUCP (The Phantom) (02/23/85)
In article <233@resonex.UUCP> nancy@resonex.UUCP (Nancy Blachman) writes: > >Do you have any recommendations on how to block news and uucp? The easiest/cleanest way I've seen is simply turn off the execute bits on /usr/lib/uucp/uucico. when a uucp system logs in, it will get a message back something like 'no login shell' and time out. the break is clean, no information is lost, chances of screwups (if you have to do and undo multiple operations you can either miss something or get hit by a vulnerability window) is minimal, and the loading of a login that fails is minimal. chuq -- From behind the eight ball: Chuq Von Rospach {cbosgd,fortune,hplabs,ihnp4,seismo}!nsc!chuqui nsc!chuqui@decwrl.ARPA We'll be recording at the Paradise Friday night. Live, on the Death label.
roy@phri.UUCP (Roy Smith) (02/23/85)
> When we are running experiments [...] we would prefer not to have news > or uucp running because they slow down the system. > > Do you have any recommendations on how to block news and uucp? Instead of having /usr/lib/uucp/uucico in the shell field of /etc/passwd for your uucp logins, put in /usr/lib/uucp/checktime, which appears below. I don't actually have this running here; I made this up just now, so please don't flame me if I messed up a few details. And, yes, I'm sure this can be done just a simply with a shell file. main () { if (open ("/usr/spool/uucp/shutup", FIO_READ) < 0) exec ("/usr/lib/uucp/uucico"); else { printf ("sorry -- we're closed\n"); exit (1); } } This attempts to open the "shutup" file for reading. If the file DOES NOT EXIST, open returns an error, and you just run uucico like you usually do. If you can open the file, it exists, and you just exit. The uucico at the other end will get either a HANDSHAKE or TIMEOUT error and will give up. All you have to do when you don't want uucp's to call you up is to create this file; when you want to allow incoming uucp's again, just remove it. You might want to warn you uucp partners about this; if they happen to run uucico in debug mode, they will see the "sorry -- we're closed" message and get confused as hell. You can expand on this, I'm sure. -- The opinions expressed herein do not necessarily reflect the views of the Public Health Research Institute. {decvax,ihnp4}!vax135!timeinc\ >!phri!roy (Roy Smith) {allegra,rocky2}!cubsvax/