From owner-freebsd-questions  Tue Jul 18 12:37:59 2000
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Date: Tue, 18 Jul 2000 15:45:35 -0400
From: Matt Gostick <matt@virtualservice.com>
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To: Drew Sanford <drew@planetwe.com>, questions@freebsd.org
Subject: Re: Mailing IP changes
References: <3974A0A5.F4632A9A@planetwe.com>
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I took a quick glance at this piece of code after I sent it and noticed
why it didn't work for all interfaces :)  It's fixed now.

#include <stdio.h>
#include <sys/types.h>
#include <sys/socket.h>
#include <sys/ioctl.h>
#include <netinet/in.h>
#include <net/if.h>

int main (int argc, char **argv) {
  int sock_fd;
  struct ifreq ifr;
  struct in_addr ip;

  /* open a socket for the ioctl calls */
  if ((sock_fd = socket(AF_INET, SOCK_DGRAM, 0)) == -1) {
    perror("socket");
    return -1;
  }

  /* make the ioctl call */
  strcpy(ifr.ifr_name, argv[1]);
  if (ioctl(sock_fd, SIOCGIFADDR, &ifr) == -1) {
    perror("ioctl(SIOCGIFADDR)");
    return -1;
  }
  ip = (struct in_addr) (((struct sockaddr_in *)
&ifr.ifr_addr)->sin_addr);
  
  /* close the socket */
  close(sock_fd);
  
  /* print the ip address */
  printf("%s\n", inet_ntoa(ip));
  
  /* success */
  return 0;
}


Drew Sanford wrote:
> 
> Hi,
>         I'd like to know if anyone has a good way of emailing a machines IP
> address to themselves when the machine (connected via PPP) has to
> reconnect and is assigned a new IP. What is the most sensible way to do
> this?
> 
> --
> Drew Sanford
> Systems Administrator
> Planetwe.com
> Email: drew@planetwe.com
> 
> To Unsubscribe: send mail to majordomo@FreeBSD.org
> with "unsubscribe freebsd-questions" in the body of the message

-- 
Matt Gostick <matt@virtualservice.com>


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