Groups > comp.lang.java.programmer > #39648

Re: InetAddress.isReachable() ?

From	Knute Johnson <knute2020@585ranch.com>
Newsgroups	comp.lang.java.programmer
Subject	Re: InetAddress.isReachable() ?
Date	2020-11-01 10:30 -0600
Organization	A noiseless patient Spider
Message-ID	<rnmnrt$bo9$1@dont-email.me> (permalink)
References	(3 earlier) <rmvsjs$1h20$1@gioia.aioe.org> <rmvt2a$nt2$1@dont-email.me> <rn144s$bq6$1@dont-email.me> <rnf8co$5ph$1@dont-email.me> <rnfrau$1htm$1@gioia.aioe.org>

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On 10/29/20 8:47 PM, Arne Vajhøj wrote:
> On 10/29/2020 4:23 PM, Knute Johnson wrote:
>> I'm not sure why Java has the privilege issue with 
>> InetAddress.isReachable() but it does.
> 
> Someone thought that use of ICMP in Linux should
> require privs.
> 
> The ping executable is rws while the java
> executable is rwx.
> 
> Arne
> 
> 

OK, so that got me curious and I checked on my Xubuntu box that I was 
using when writing this program and found this:

/usr/bin$ ls -al ping
-rwxr-xr-x 1 root root 72776 Jan 30  2020 ping

But then for fun I looked on my RaspberryPi and found:

~ $ ls -al /bin/ping
-rwsr-xr-x 1 root root 55720 Jan 13  2020 /bin/ping

The Buntus are usually fairly lax in some of their settings but I 
thought this was interesting.  Useless but interesting.

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Thread

InetAddress.isReachable() ? Knute Johnson <knute2020@585ranch.com> - 2020-10-23 11:50 -0500
  Re: InetAddress.isReachable() ? Arne Vajhøj <arne@vajhoej.dk> - 2020-10-23 13:14 -0400
    Re: InetAddress.isReachable() ? Knute Johnson <knute2020@585ranch.com> - 2020-10-23 18:10 -0500
      Re: InetAddress.isReachable() ? Arne Vajhøj <arne@vajhoej.dk> - 2020-10-23 20:30 -0400
        Re: InetAddress.isReachable() ? Knute Johnson <nospam@rabbitbrush.frazmtn.com> - 2020-10-23 19:38 -0500
          Re: InetAddress.isReachable() ? Martin Gregorie <martin@mydomain.invalid> - 2020-10-24 11:45 +0000
            Re: InetAddress.isReachable() ? Knute Johnson <nospam@rabbitbrush.frazmtn.com> - 2020-10-29 15:23 -0500
              Re: InetAddress.isReachable() ? Martin Gregorie <martin@mydomain.invalid> - 2020-10-29 21:36 +0000
              Re: InetAddress.isReachable() ? Arne Vajhøj <arne@vajhoej.dk> - 2020-10-29 21:47 -0400
                Re: InetAddress.isReachable() ? Knute Johnson <knute2020@585ranch.com> - 2020-11-01 10:30 -0600

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