/* @(#)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); }