From:	Richard Dawe <richdawe AT bigfoot DOT com>
Newsgroups:	comp.os.msdos.djgpp
Subject:	Re: to ping an address via tcp/ip
Date:	Sun, 12 Mar 2000 13:01:01 +0000
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To:	djgpp AT delorie DOT com
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Reply-To:	djgpp AT delorie DOT com

Hello.

Warp Kez wrote:
> Out of necessity I have to rewrite most of my VB programs in C, but I am
> unfamiliar with the language.
> 
> Is there a web site that specialises in Network programming using DJGPP,
> that could give me an idea on the command structure required to ping and
> then return that machines hostname?

This really depends which operating system you want the program to run
under.

I maintain libsocket:

http://libsocket.tsx.org/

This uses some of Windows's low-level networking interfaces (virtual
device drivers) to provide networking to DOS programs running under
Windows.

You could use the RSXNT/DJ add-on for DJGPP, which allows you to create
Windows programs using DJGPP.

If you want to the program to run under DOS, then you could look at
Watt-32:

http://www.bgnett.no/~giva/

To ping a machine you need to construct an ICMP packet, which means
constructing the IP header yourself using a raw socket. Winsock 1 (well,
Microsoft's implementation) will not allow you to do this. Winsock 2 does,
but you need to run with Administrator priviledges on Windows NT. IIRC
Watt-32 has raw socket support, so you should be able to do this under
DOS.

To return the host name you'll need to do a reverse DNS lookup (numbers to
name(s)), which aren't strictly required by the RFCs. The BSD socket call
for this gethostbyaddr().

I have a bunch of links here that might help you:

http://www.phekda.freeserve.co.uk/richdawe/lsck/lsck_lnk.htm

If you're mainly concerned about Windows, then read the Winsock
Programmer's FAQ (link on the links page above). This is a good read
anyway, for general network programming.

HTH, bye,

-- 
Richard Dawe
richdawe AT bigfoot DOT com ICQ 47595498 http://www.bigfoot.com/~richdawe/

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