Design idea for Ping Application

David M. Cooke cookedm+news at physics.mcmaster.ca
Tue Aug 19 23:58:24 CEST 2003


At some point, "Mike C. Fletcher" <mcfletch at rogers.com> wrote:

> Jeremy Hylton wrote:
> ...
>
>>Years ago I wrote ping in Python.  I don't have the code anymore, but
>>there's not too much too it.  One of the Stevens books has C source for
>>a simple ping, and it's not much work to adapt the basic design to
>>Python.  It's far simpler than the C code.
>>
>>If you had a simple ping library in Python, it would be easy to run
>>several Ping instances in a single select loop.  Then you don't need to
>>bother with threads and pipes and shells.
>>
> As pointed out by a previous poster, it's available from Python.org.
> We've got  a version which fixes a few (trivial) bugs (use of 'h'
> instead of 'H' in struct formats mostly, to indicate unsigned rather
> than signed ints).  Works nicely on Win32, however, I've not yet been
> able to get the code to run under Unix (where creating raw sockets is
> a no-no).

Only root can create raw sockets. You'll notice the system ping
command is setuid root so that ordinary users can use it. Running this
code as root works.

-- 
|>|\/|<
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|David M. Cooke
|cookedm(at)physics(dot)mcmaster(dot)ca




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