Mailing-List: contact cygwin-help AT cygwin DOT com; run by ezmlm
List-Subscribe: <mailto:cygwin-subscribe AT cygwin DOT com>
List-Archive: <http://sources.redhat.com/ml/cygwin/>
List-Post: <mailto:cygwin AT cygwin DOT com>
List-Help: <mailto:cygwin-help AT cygwin DOT com>, <http://sources.redhat.com/ml/#faqs>
Sender: cygwin-owner AT cygwin DOT com
Mail-Followup-To: cygwin AT cygwin DOT com
Delivered-To: mailing list cygwin AT cygwin DOT com
From: Sam Edge <sam DOT edgeZZZ AT lineone DOT net>
To: cygwin AT cygwin DOT com
Subject: Re: ping on cygwin?
Date: Tue, 14 Jan 2003 07:30:28 +0000
Organization: .
Reply-To: cygwin AT cygwin DOT com
Message-ID: <ttd72v4rsielco7od4cjlqeom927j4i0po@4ax.com>
References: <217260-220031113163432974 AT M2W060 DOT mail2web DOT com> <3E22F92D DOT 3040908 AT isg DOT de>
In-Reply-To: <3E22F92D.3040908@isg.de>
MIME-Version: 1.0
Content-Type: text/plain; charset=us-ascii
X-Posting-Agent: Hamster/2.0.0.0
Content-Transfer-Encoding: 8bit
X-MIME-Autoconverted: from quoted-printable to 8bit by delorie.com id h0E7VjI18533

Tino Lange <tino DOT lange AT isg DOT de>  wrote in <3E22F92D DOT 3040908 AT isg DOT de>
in gmane.os.cygwin on Mon, 13 Jan 2003 18:36:45 +0100:

> Thanks! I read it once again and hence I like to (try to) contribute - 
> see below.
> 
> I learned a lot about raw icmp sockets and why only root is allowed to 
> open them - making ping a setuid program.

If you do write a better ping for Windows - whether native or Cygwin -
you can use raw sockets and construct your own ICMP datagrams but on
NT/2k/XP-Pro this will only run if you have elevated privileges, just
as on UNIX-like systems. Because there's no SUID feature available in
Windows or in Cygwin (yet!) this is something of a problem.

In case you're not aware, the Microsoft ping.exe and tracert.exe
programs use a system library called icmp.dll which provides system
calls that will send and receive ICMP Echo datagrams without needing
extra privileges. This might be useful for your version.

http://msdn.microsoft.com/library/default.asp?url=/library/en-us/wcecomm/htm/_wcesdk_internet_control_message_protocol__icmp_.asp
(Don't worry that this is under the Windows CE section, by the way. It
applies to NT/2k/XP too.)

-- 
Sam Edge

--
Unsubscribe info:      http://cygwin.com/ml/#unsubscribe-simple
Bug reporting:         http://cygwin.com/bugs.html
Documentation:         http://cygwin.com/docs.html
FAQ:                   http://cygwin.com/faq/