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Top Forums Shell Programming and Scripting help to ping a host, is it alive or not ... Post 61002 by google on Wednesday 26th of January 2005 08:13:04 PM
Old 01-26-2005
Here is a ping node script. Look it over, create a mail.list file and set the path to this file in the script. Then add a cron entry to run the script at any interval you choose. The script will ping any host you have listed in the ping file (which you need to define and set its path to.). The script was written by the author of Mastering UNIX Shell Scripting by Wiley books (he provides his scripts for free on his website). I use the script but I have modified it so that I ping the IPs in the host file instead of a ping list. Note that I simply changed the extension on the script to preserve formatting when you open it online. Change extension back to ksh after saving.

Last edited by google; 01-26-2005 at 09:19 PM..
 

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SMRSH(8)						      System Manager's Manual							  SMRSH(8)

NAME
smrsh - restricted shell for sendmail SYNOPSIS
smrsh -c command DESCRIPTION
The smrsh program is intended as a replacement for sh for use in the ``prog'' mailer in sendmail(8) configuration files. It sharply limits the commands that can be run using the ``|program'' syntax of sendmail in order to improve the over all security of your system. Briefly, even if a ``bad guy'' can get sendmail to run a program without going through an alias or forward file, smrsh limits the set of programs that he or she can execute. Briefly, smrsh limits programs to be in a single directory, by default /usr/lib/sendmail.d/bin/ allowing the system administrator to choose the set of acceptable commands, and to the shell builtin commands ``exec'', ``exit'', and ``echo''. It also rejects any commands with the characters ``', `<', `>', `;', `$', `(', `)', ` ' (carriage return), or ` ' (newline) on the command line to prevent ``end run'' attacks. It allows ``||'' and ``&&'' to enable commands like: ``"|exec /usr/local/bin/filter || exit 75"'' Initial pathnames on programs are stripped, so forwarding to ``/usr/bin/vacation'', ``/usr/bin/vacation'', ``/home/server/mydir/bin/vaca- tion'', and ``vacation'' all actually forward to `/usr/lib/sendmail.d/bin/vacation''. System administrators should be conservative about populating the /usr/lib/sendmail.d/bin/ directory. For example, a reasonable additions is vacation(1), and the like. No matter how brow-beaten you may be, never include any shell or shell-like program (such as perl(1)) in the /usr/lib/sendmail.d/bin/ directory. Note that this does not restrict the use of shell or perl scripts in the /usr/lib/sendmail.d/bin/ directory (using the ``#!'' syntax); it simply disallows execution of arbitrary programs. Also, including mail filtering programs such as procmail(1) is a very bad idea. procmail(1) allows users to run arbitrary programs in their procmailrc(5). COMPILATION
Compilation should be trivial on most systems. You may need to use -DSMRSH_PATH="path" to adjust the default search path (defaults to ``/bin:/usr/bin'') and/or -DSMRSH_CMDDIR="dir" to change the default program directory (defaults to ``/usr/lib/sendmail.d/bin/''). FILES
/usr/lib/sendmail.d/bin/ - default directory for restricted programs on SuSE Linux SEE ALSO
sendmail(8) $Date: 2004/08/06 03:55:35 $ SMRSH(8)
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