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logging all input and output on a tty

DISCUSSION Esben Stien 5 participants 7 messages Jan 21, 2004

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Esben Stien

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#0 lore raw

I've been trying to get an answer to tty logging for a long time without anyone able to answer. I want to log everything that is written to and from a certain tty. I expect this to be a kernel module. Anyone have any pointers where I can look?. Is there an existing module?

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b0ef
#1 lore raw
Quoted 4 lines · Esben Stien

I've been trying to get an answer to tty logging for a long time without anyone able to answer. I want to log everything that is written to and from a certain tty.

You can just cat the device, like cat /dev/tty<number>. So you can also use normal redirectors (> , >> etc) or use a pager.

Ludootje

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#4 lore raw
In reply to Esben Stien
Quoted 4 lines · Esben Stien

I've been trying to get an answer to tty logging for a long time without anyone able to answer. I want to log everything that is written to and from a certain tty. I expect this to be a kernel module. Anyone have any pointers where I can look?. Is there an existing module?

This can be done relatively easily in userspace via "script" or "screen".

Cheers, Andreas
--
Andreas Dilger
http://sourceforge.net/projects/ext2resize/
http://www-mddsp.enel.ucalgary.ca/People/adilger/

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#2 lore raw
In reply to Ludootje
Quoted 2 lines · Ludootje

You can just cat the device, like cat /dev/tty<number>. So you can also use normal redirectors (> , >> etc) or use a pager.

If I do cat /dev/tty1 on /dev/tty2, I see what I write to /dev/tty1 on /dev/tty2, but I don't see what I write to /dev/tty1 while working in /dev/tty1 (all the input is being printed on /dev/tty2) . And besides, I only see the input I type, not the output of f.ex a command (on /dev/tty2). I want to monitor users and log everything that is done on a specific tty when they log in.

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b0ef
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#5 lore raw
In reply to Andreas Dilger
Quoted 1 line · Andreas Dilger

This can be done relatively easily in userspace via "script" or "screen".

Yes, though I want this for monitoring. I don't want to start neither script nor screen when a user logs into a tty. I just want to log everything written in a tty.

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#3 lore raw
In reply to Esben Stien
Quoted 6 lines · Esben Stien
Quoted 2 lines · Ludootje

You can just cat the device, like cat /dev/tty<number>. So you can also use normal redirectors (> , >> etc) or use a pager.

If I do cat /dev/tty1 on /dev/tty2, I see what I write to /dev/tty1 on /dev/tty2, but I don't see what I write to /dev/tty1 while working in /dev/tty1 (all the input is being printed on /dev/tty2) . And besides, I only see the input I type, not the output of f.ex a command (on /dev/tty2). I want to monitor users and log everything that is done on a specific tty when they log in.

This is in debian:

Package: ttysnoop
Priority: optional
Section: admin
Installed-Size: 56
Maintainer: Alberto Gonzalez Iniesta <[email protected]>
Architecture: i386
Version: 0.12c-8
Depends: libc6 (>= 2.3.2-1)
Filename: pool/main/t/ttysnoop/ttysnoop_0.12c-8_i386.deb
Size: 15126
MD5sum: 462a28b83327bd2ae987791528e9e095
Description: TTY Snoop - allows you to spy on telnet+serial connections
TTYSnoop allows you to snoop on login tty's through another tty-device or pseudo-tty. The snoop-tty becomes a 'clone' of the original tty, redirecting both input and output from/to it.

#6 lore raw
In reply to Esben Stien

Good afternoom, Esben,

Quoted 4 lines · Esben Stien

I've been trying to get an answer to tty logging for a long time without anyone able to answer. I want to log everything that is written to and from a certain tty. I expect this to be a kernel module. Anyone have any pointers where I can look?. Is there an existing module?

User-Mode Linux can log all traffic to or from a tty to files
stored on the host.
http://user-mode-linux.sourceforge.net/tty_logging.html

Any questions about this feature should be directed to:
[email protected]
Cheers,
- Bill

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