Date: Tue, 3 Sep 2002 11:18:15 +1000 From: Edwin Groothuis <edwin@mavetju.org> To: Tony <tony@idk.com> Cc: freebsd-questions@freebsd.org Subject: Re: Need help: gethostbyaddr Message-ID: <20020903011815.GY785@k7.mavetju> In-Reply-To: <200209030021.RAA19794@idk.com> References: <200209030021.RAA19794@idk.com>
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On Mon, Sep 02, 2002 at 05:21:50PM -0700, Tony wrote:
> I just cannot seem to understand the function gethostbyaddr, more what and
> how would one lookup an ip number.
>
> All I want to do it write a program to look up one ip number to it's host
> name. I am very confused with this function.
>
> Example?
#include <sys/types.h>
#include <sys/socket.h>
#include <netinet/in.h>
#include <arpa/inet.h>
#include <netdb.h>
#include <stdio.h>
int main(void) {
struct hostent *h;
struct in_addr in;
inet_aton("212.204.230.141",&in);
h=gethostbyaddr((char *)&in,4,AF_INET);
printf("%s is %s\n",inet_ntoa(in),h->h_name);
return 0;
}
Edwin
--
Edwin Groothuis | Personal website: http://www.MavEtJu.org
edwin@mavetju.org | Weblog: http://www.mavetju.org/weblog/weblog.php
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