check_ping vs check_icmp?

[Marc Powell]

> -----Original Message-----
> From: nagios-users-bounces at lists.sourceforge.net [mailto:nagios-users-
> bounces at lists.sourceforge.net] On Behalf Of Rogelio Bastardo
> Sent: Monday, July 30, 2007 6:22 PM
> To: Nagios Users
> Subject: Re: [Nagios-users] check_ping vs check_icmp?
> 
> On 7/30/07, Rogelio Bastardo <scubacuda at gmail.com> wrote:
> > > So, if you don't mind installing the plugin setuid root, I'd
recommend
> > > using check_icmp.
> >
> > Forgive my ignorance, but where can I find this?
> >
> > (I googled for "setuid root nagios check_icmp" but nothing jumped
out at
> me)
> 
> ah, I see it's a package

Actually, this is terminology detailing how a specific set of
permissions are applied to a file/program. Basically, setuid and setgid
mean that a flag is applied to the file/program with chmod such that it
will retain it's ownership for that bit when being used. For the
purposes here, setuid root means that the file should be owned by the
user root (chown root /path/to/check_icmp) and setuid (chmod u+s
/path/to/check_icmp). This will cause check_icmp to always run as the
root user no matter who is running it. This allows it to open the
necessary socket connections without requiring that the actual root user
be running it. setuid is denoted by the 's' below --

$ ls -l /usr/local/nagios/libexec/check_icmp 
-r-sr-xr-x    1 root     nagios      15424 Jun  9 21:42
/usr/local/nagios/libexec/check_icmp

$ ls -l /bin/ping
-rwsr-xr-x    1 root     root        27860 Sep 29  2005 /bin/ping

--
Marc

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