1 /* $OpenBSD: get_myaddress.c,v 1.12 2005/08/08 08:05:35 espie Exp $ */ 2 /* 3 * Sun RPC is a product of Sun Microsystems, Inc. and is provided for 4 * unrestricted use provided that this legend is included on all tape 5 * media and as a part of the software program in whole or part. Users 6 * may copy or modify Sun RPC without charge, but are not authorized 7 * to license or distribute it to anyone else except as part of a product or 8 * program developed by the user. 9 * 10 * SUN RPC IS PROVIDED AS IS WITH NO WARRANTIES OF ANY KIND INCLUDING THE 11 * WARRANTIES OF DESIGN, MERCHANTIBILITY AND FITNESS FOR A PARTICULAR 12 * PURPOSE, OR ARISING FROM A COURSE OF DEALING, USAGE OR TRADE PRACTICE. 13 * 14 * Sun RPC is provided with no support and without any obligation on the 15 * part of Sun Microsystems, Inc. to assist in its use, correction, 16 * modification or enhancement. 17 * 18 * SUN MICROSYSTEMS, INC. SHALL HAVE NO LIABILITY WITH RESPECT TO THE 19 * INFRINGEMENT OF COPYRIGHTS, TRADE SECRETS OR ANY PATENTS BY SUN RPC 20 * OR ANY PART THEREOF. 21 * 22 * In no event will Sun Microsystems, Inc. be liable for any lost revenue 23 * or profits or other special, indirect and consequential damages, even if 24 * Sun has been advised of the possibility of such damages. 25 * 26 * Sun Microsystems, Inc. 27 * 2550 Garcia Avenue 28 * Mountain View, California 94043 29 */ 30 31 /* 32 * get_myaddress.c 33 * 34 * Get client's IP address via ioctl. This avoids using the yellowpages. 35 * Copyright (C) 1984, Sun Microsystems, Inc. 36 */ 37 38 #include <rpc/types.h> 39 #include <rpc/xdr.h> 40 #include <rpc/pmap_prot.h> 41 #include <sys/socket.h> 42 #include <stdio.h> 43 #include <stdlib.h> 44 #include <unistd.h> 45 #include <net/if.h> 46 #include <netinet/in.h> 47 #include <ifaddrs.h> 48 49 /* 50 * don't use gethostbyname, which would invoke yellow pages 51 * 52 * Avoid loopback interfaces. We return information from a loopback 53 * interface only if there are no other possible interfaces. 54 */ 55 int 56 get_myaddress(struct sockaddr_in *addr) 57 { 58 struct ifaddrs *ifap, *ifa; 59 int loopback = 0, gotit = 0; 60 61 if (getifaddrs(&ifap) != 0) 62 return (-1); 63 64 again: 65 for (ifa = ifap; ifa; ifa = ifa->ifa_next) { 66 if ((ifa->ifa_flags & IFF_UP) && 67 ifa->ifa_addr->sa_family == AF_INET && 68 (loopback == 1 && (ifa->ifa_flags & IFF_LOOPBACK))) { 69 *addr = *((struct sockaddr_in *)ifa->ifa_addr); 70 addr->sin_port = htons(PMAPPORT); 71 gotit = 1; 72 break; 73 } 74 } 75 if (gotit == 0 && loopback == 0) { 76 loopback = 1; 77 goto again; 78 } 79 freeifaddrs(ifap); 80 return (0); 81 } 82