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Date: Tue, 18 Jul 2000 15:34:18 -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 wrote a C program a while ago that retrieved the ip of the tun
device.  I quoted it below.  When compiled just run it with `get_ip
tun0` or whatever your tun device is.  It doesn't work for normal
interfaces.. I'm not quite sure why... but it does what I need it to and
I left it at that :)  To get it to mail you ... I believe a file in
/etc/ppp can contain a list scripts that you want run when a connection
is established.  Just change the print below to a system call to
sendmail or whatever and pop it in there.  `man ppp` to find out what
the file is called.  I think ppp.linkup or something like that.  Good
luck.

#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 calls */
  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);
  if (ioctl(sock_fd, SIOCGIFDSTADDR, &ifr) == -1) {
    perror("ioctl(SIOCGIFDSTADDR)");
    return -1;
  }

  /* 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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