Groups > comp.lang.java.programmer > #10582

Re: Ping from JAVA to IP Address

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From	glen herrmannsfeldt <gah@ugcs.caltech.edu>
Newsgroups	comp.lang.java.programmer
Subject	Re: Ping from JAVA to IP Address
Date	Wed, 7 Dec 2011 08:59:26 +0000 (UTC)
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Arne Vajhøj <arne@vajhoej.dk> wrote:

(snip)
> Well - your post was far from complete.

> Raw sockets and ICMP are not exposed to the programmer in Java.

> But that does not prevent something inside Java to use ICMP.

As far as I know, at least for unix-like system, you need to
be setuid root to do raw sockets or ICMP.  Running java as
setuid root doesn't sound great for security.

I would think that it could do something like system("ping") 
to run the ping program (which is setuid root).

> The isReachable method will in fact attempt a ping on *nix.

> On Windows it uses the echo service.

> (it will also fallback to echo on *nix if no privilege to call ping)

-- glen

Thread

Ping from JAVA to IP Address sahm <sahm007@gmail.com> - 2011-10-24 11:01 -0700
  Re: Ping from JAVA to IP Address Robert Klemme <shortcutter@googlemail.com> - 2011-10-24 20:26 +0200
    Re: Ping from JAVA to IP Address markspace <-@.> - 2011-10-24 14:52 -0700
      Re: Ping from JAVA to IP Address sahm <sahm007@gmail.com> - 2011-10-24 22:31 -0700
        Re: Ping from JAVA to IP Address sahm <sahm007@gmail.com> - 2011-10-25 01:56 -0700
          Re: Ping from JAVA to IP Address Screamin Lord Byron <scre@min.dot> - 2011-10-25 11:57 +0200
          Re: Ping from JAVA to IP Address markspace <-@.> - 2011-10-25 08:12 -0700
            Re: Ping from JAVA to IP Address Screamin Lord Byron <scre@min.dot> - 2011-10-25 22:13 +0200
              Re: Ping from JAVA to IP Address markspace <-@.> - 2011-10-25 16:02 -0700
                Re: Ping from JAVA to IP Address Screamin Lord Byron <scre@min.dot> - 2011-10-26 13:16 +0200
              Re: Ping from JAVA to IP Address Arne Vajhøj <arne@vajhoej.dk> - 2011-11-06 15:29 -0500
                Re: Ping from JAVA to IP Address glen herrmannsfeldt <gah@ugcs.caltech.edu> - 2011-12-07 08:59 +0000
  Re: Ping from JAVA to IP Address Roedy Green <see_website@mindprod.com.invalid> - 2011-10-25 21:28 -0700
  Re: Ping from JAVA to IP Address Arne Vajhøj <arne@vajhoej.dk> - 2011-11-06 15:36 -0500

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