[REBOL] Re: Can I Ping in REBOL?
From: joel:neely:fedex at: 17-Apr-2001 2:47
Perhaps all is not gloomy...
Geraint Jones wrote:
> 17/04/01 13:56:29, Mat Bettinson <[mat--eurogamer--net]> wrote:
>
> >GJ> Now to the problem I have: I am a Computer Technician for a
> >GJ> college in the UK and the Network Administrator here wants to
> >GJ> write a CGI Ping tool.
> >
> >No. RT hath decreed that there is no use for ICMP in Rebol. So we've
> >had to use other languages for that task.
> >
> >GJ> will another language do it?
> >
> >Certainly.
>
> Thanks for the response, but since Perl can't use ICMP without being
> logged-in as the root user and it won't work properly with other
> protocols, which CGI language can we use to ping our own server
> periodically where security is an issue? Or is it possible to code
> our own ICMP functions in REBOL or Perl, and if so, how ...
>
What's wrong with ping? Is there some local security rule? Can you
run ping from the command line under the same account that the web
server runs as? If so, I submit the following:
> cat ping.pl.cgi
#!/usr/local/bin/perl -w
use strict;
my $HOSTNAME = "x.y.z.com"; # name changed to protect my job ;-)
open (PING, "ping -q -c 5 $HOSTNAME |");
my @results = <PING>;
close (PING);
print <<PAGE;
<html>
<head>
<title>Ping results for $HOSTNAME</title>
</head>
<body>
<h1>Ping results for $HOSTNAME</h1>
<pre>@results</pre>
</body>
</html>
PAGE
exit (0);
which I can run to get the following output:
> ./ping.pl.cgi
<html>
<head>
<title>Ping results for x.y.z.com</title>
</head>
<body>
<h1>Ping results for x.y.z.com</h1>
<pre>PING x.y.z.com (300.301.302.303) from 300.301.302.303 :
56(84) bytes of data.
--- x.y.z.com ping statistics ---
5 packets transmitted, 5 packets received, 0% packet loss
round-trip min/avg/max = 80.1/97.7/110.1 ms
</pre>
</body>
</html>
(which is actual output, except for the mangling of host name and IP
addresses).
Translating the above into REBOL "is left as an exercise for the
reader"... ;-)
-jn-
