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/* @(#)get_myaddress.c 2.1 88/07/29 4.0 RPCSRC */
/*
* Sun RPC is a product of Sun Microsystems, Inc. and is provided for
* unrestricted use provided that this legend is included on all tape
* media and as a part of the software program in whole or part. Users
* may copy or modify Sun RPC without charge, but are not authorized
* to license or distribute it to anyone else except as part of a product or
* program developed by the user.
*
* SUN RPC IS PROVIDED AS IS WITH NO WARRANTIES OF ANY KIND INCLUDING THE
* WARRANTIES OF DESIGN, MERCHANTIBILITY AND FITNESS FOR A PARTICULAR
* PURPOSE, OR ARISING FROM A COURSE OF DEALING, USAGE OR TRADE PRACTICE.
*
* Sun RPC is provided with no support and without any obligation on the
* part of Sun Microsystems, Inc. to assist in its use, correction,
* modification or enhancement.
*
* SUN MICROSYSTEMS, INC. SHALL HAVE NO LIABILITY WITH RESPECT TO THE
* INFRINGEMENT OF COPYRIGHTS, TRADE SECRETS OR ANY PATENTS BY SUN RPC
* OR ANY PART THEREOF.
*
* In no event will Sun Microsystems, Inc. be liable for any lost revenue
* or profits or other special, indirect and consequential damages, even if
* Sun has been advised of the possibility of such damages.
*
* Sun Microsystems, Inc.
* 2550 Garcia Avenue
* Mountain View, California 94043
*/
#if 0
static char sccsid[] = "@(#)get_myaddress.c 1.4 87/08/11 Copyr 1984 Sun Micro";
#endif
/*
* get_myaddress.c
*
* Get client's IP address via ioctl. This avoids using the yellowpages.
* Copyright (C) 1984, Sun Microsystems, Inc.
*/
#include <rpc/types.h>
#include <rpc/clnt.h>
#include <rpc/pmap_prot.h>
#include <sys/socket.h>
#include <stdio.h>
#include <unistd.h>
#include <net/if.h>
#include <sys/ioctl.h>
/* Order of following two #includes reversed by roland@gnu */
#include <netinet/in.h>
#include <arpa/inet.h>
/*
* don't use gethostbyname, which would invoke yellow pages
*
* Avoid loopback interfaces. We return information from a loopback
* interface only if there are no other possible interfaces.
*/
void
get_myaddress (struct sockaddr_in *addr)
{
int s;
char buf[BUFSIZ];
struct ifconf ifc;
struct ifreq ifreq, *ifr;
int len, loopback = 0;
if ((s = socket (AF_INET, SOCK_DGRAM, 0)) < 0)
{
perror ("get_myaddress: socket");
exit (1);
}
ifc.ifc_len = sizeof (buf);
ifc.ifc_buf = buf;
if (ioctl (s, SIOCGIFCONF, (char *) &ifc) < 0)
{
perror ("get_myaddress: ioctl (get interface configuration)");
exit (1);
}
again:
ifr = ifc.ifc_req;
for (len = ifc.ifc_len; len; len -= sizeof ifreq)
{
ifreq = *ifr;
if (ioctl (s, SIOCGIFFLAGS, (char *) &ifreq) < 0)
{
perror ("get_myaddress: ioctl");
exit (1);
}
if ((ifreq.ifr_flags & IFF_UP) && (ifr->ifr_addr.sa_family == AF_INET)
&& (!(ifreq.ifr_flags & IFF_LOOPBACK) ||
(loopback == 1 && (ifreq.ifr_flags & IFF_LOOPBACK))))
{
*addr = *((struct sockaddr_in *) &ifr->ifr_addr);
addr->sin_port = htons (PMAPPORT);
close (s);
return;
}
ifr++;
}
if (loopback == 0)
{
loopback = 1;
goto again;
}
close (s);
}
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