Login or Register to Ask a Question and Join Our Community

Sponsored Content
Full Discussion: Testing ssh connection from KSH script
Top Forums Shell Programming and Scripting Testing ssh connection from KSH script Post 73409 by bakunin on Wednesday 1st of June 2005 03:49:22 AM
Old 06-01-2005
@Tom: Many thanks, the explanations are good, but i got so far already.

My (at least my, I don't know about Dylan but suppose he will run into similar problems) problem is: I can at one point make sure i have exchanged all the necessary keys and then run some script. But i cannot ensure this for any future and for any host because sometimes the exchanged keys become invalid and the next execution of ssh would ask for a new authentication.

For example: I have long worked on IBMs SP/2 platform and there was a mechanism called "distributed shell". It was a (kerberized) wrapper around rsh with which it was possible to execute a command on one, several or all nodes simultaneously. Issuing 'dsh "date"' would result in an output like:

# dsh "date"
foo1: Wed Jun 1 09:33:18 MSZ 2005
foo2: Wed Jun 1 09:33:19 MSZ 2005
foo3: Wed Jun 1 09:33:19 MSZ 2005
foo4: Wed Jun 1 09:33:18 MSZ 2005
...

Since the SP/2 (and with it PSSP and its successor Cluster/1600) is long gone I tried to write a script imitating this behavior. Neither does it run regularly nor does it always run on the same list of machines. The script is working perfectly as long as all the keys are (AND STAY) exchanged, but once a key is missing the script hangs.

Maybe i'm overseeing something really stupid here, but i haven't found out what to do in this case.

*sigh* back then in the good old days of kerberos things were less complicated - but then, who'd have guessed back then that once these times would be regarded as 'good'? ;-))

bakunin
 

10 More Discussions You Might Find Interesting

1. Shell Programming and Scripting

Remote SSH Connection Using Script

Hi, I am new to Shell Scripting. Can anybody help me in writing a Script Which Could Login from a Unix box to a Remote Unix box which accepts the user credentials automatically and display the result for checking the Disk Space Utilisation (Without running any SSH agent). (1 Reply)
Discussion started by: ajith_tg
1 Replies

2. Shell Programming and Scripting

ssh connection script

Hi all, I'm writing a script that chooses the best computer available in an open lab. The script works great except every now and then there is a dead computer in the lab that begins the ssh handshaking, but freezes after the following: debug1: Offering public key: When the script happens... (2 Replies)
Discussion started by: x-375HK-x
2 Replies

3. Shell Programming and Scripting

Testing success of AWK code in KSH script

I need a bit of help here on something simple. I have a KSH script (must be KSH) that needs to change 2 positional variables in a CSV script. The CSV script looks like this: 00001,010109,01/01/2009 00:01:01 00008,090509,09/05/2009 13:47:26 My AWK script will change $2 and $3 based... (4 Replies)
Discussion started by: kretara
4 Replies

4. Shell Programming and Scripting

Testing connection with a script

I have a box that has to start dhcpd when a certain connection is down and stop the dhcpd when the connection is up again. I would appriciate any help making this script: From server A: ping server B if connection is ok then do nothing if connection is not ok then start dhcpd until... (8 Replies)
Discussion started by: KimJensen
8 Replies

5. Shell Programming and Scripting

Mysql command after a SSH connection (Script)

Hi all, Im new at scripting and i need to run a few commands at work every hours so i decide to make a script but on 1 of the steps i have a the follwoing problem: The command i do is this: #!/bin/bash ssh root@asdasd001 'mysql -h A-db-1 -uroot -password --execute "show slave status"'... (3 Replies)
Discussion started by: Aparicio
3 Replies

6. Shell Programming and Scripting

testing postgres connection in shell script

I have a script that does db query in postgres. I'm trying to put in some error checking in the script. I keep running into the password prompt problem where when invalid credentials/or database is put it, it would prompt me for a password which hangs the script. Is there a way that I can check for... (0 Replies)
Discussion started by: zerofire123
0 Replies

7. Shell Programming and Scripting

Passing password in script for ssh connection - no except

Used the script posted on forum - unix.com/shell-programming-scripting/21597-script-change-passwords-same-user-multiple-servers.html but the last question posted on this seems to be still unanswered, tried different things with no success, can someone help giving an way to pass the password via... (5 Replies)
Discussion started by: sapadmin
5 Replies

8. Shell Programming and Scripting

ssh connection through shell script with no interruption

Hi all, I need ssh in shell script. My requirement is: - Take user_name and password from user (in PHP) - Pass this to shell script which will: - connect via ssh - Run sql query - Pass the results back in PHP - Put the results to website. I know PHP has libraries for ssh and ftp, but... (3 Replies)
Discussion started by: shekhar2010us
3 Replies

9. UNIX for Dummies Questions & Answers

Ftps connection by ksh script

Hi, I'm trying to access to FTP SERVER over SSL with this script unix : (credentials are correct) #!/usr/bin/ksh USER="test" PASSWORD="pwdtest" IP="**.***.*.***" ftp -s $IP 990 << EOF >>log_ftp user $USER $PASSWORD bin passive EOF but seems that credentials are not passed... (2 Replies)
Discussion started by: nash83
2 Replies

10. UNIX for Beginners Questions & Answers

Ssh script to validate ssh connection to multiple serves with status

Hi, I want to validate ssh connection one after one for multiple servers..... password less keys already setup but now i want to validate if ssh is working fine or not... I have .sh script like below and i have servers.txt contains all the list of servers #/bin/bash for host in $(cat... (3 Replies)
Discussion started by: sreeram4
3 Replies

LEARN ABOUT DEBIAN

ssh-argv0

SSH-ARGV0(1)						    BSD General Commands Manual 					      SSH-ARGV0(1)

NAME

     ssh-argv0 -- replaces the old ssh command-name as hostname handling

SYNOPSIS

     hostname | user@hostname [-l login_name] [command]

     hostname | user@hostname [-afgknqstvxACNTX1246] [-b bind_address] [-c cipher_spec] [-e escape_char] [-i identity_file] [-l login_name]
     [-m mac_spec] [-o option] [-p port] [-F configfile] [-L port:host:hostport] [-R port:host:hostport] [-D port] [command]

DESCRIPTION

     ssh-argv0 replaces the old ssh command-name as hostname handling.	If you link to this script with a hostname then executing the link is
     equivalent to having executed ssh with that hostname as an argument.  All other arguments are passed to ssh and will be processed normally.

OPTIONS

     See ssh(1).

FILES

     See ssh(1).

AUTHORS

     OpenSSH is a derivative of the original and free ssh 1.2.12 release by Tatu Ylonen.  Aaron Campbell, Bob Beck, Markus Friedl, Niels Provos,
     Theo de Raadt and Dug Song removed many bugs, re-added newer features and created OpenSSH.  Markus Friedl contributed the support for SSH
     protocol versions 1.5 and 2.0.  Jonathan Amery wrote this ssh-argv0 script and the associated documentation.

SEE ALSO

     ssh(1)

Debian Project							 September 7, 2001						    Debian Project
All times are GMT -4. The time now is 11:36 AM.
Unix & Linux Forums Content Copyright 1993-2022. All Rights Reserved.
Privacy Policy