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