1 /* 2 * Sun RPC is a product of Sun Microsystems, Inc. and is provided for 3 * unrestricted use provided that this legend is included on all tape 4 * media and as a part of the software program in whole or part. Users 5 * may copy or modify Sun RPC without charge, but are not authorized 6 * to license or distribute it to anyone else except as part of a product or 7 * program developed by the user. 8 * 9 * SUN RPC IS PROVIDED AS IS WITH NO WARRANTIES OF ANY KIND INCLUDING THE 10 * WARRANTIES OF DESIGN, MERCHANTIBILITY AND FITNESS FOR A PARTICULAR 11 * PURPOSE, OR ARISING FROM A COURSE OF DEALING, USAGE OR TRADE PRACTICE. 12 * 13 * Sun RPC is provided with no support and without any obligation on the 14 * part of Sun Microsystems, Inc. to assist in its use, correction, 15 * modification or enhancement. 16 * 17 * SUN MICROSYSTEMS, INC. SHALL HAVE NO LIABILITY WITH RESPECT TO THE 18 * INFRINGEMENT OF COPYRIGHTS, TRADE SECRETS OR ANY PATENTS BY SUN RPC 19 * OR ANY PART THEREOF. 20 * 21 * In no event will Sun Microsystems, Inc. be liable for any lost revenue 22 * or profits or other special, indirect and consequential damages, even if 23 * Sun has been advised of the possibility of such damages. 24 * 25 * Sun Microsystems, Inc. 26 * 2550 Garcia Avenue 27 * Mountain View, California 94043 28 */ 29 30 #if defined(LIBC_SCCS) && !defined(lint) 31 static char *rcsid = "$OpenBSD: get_myaddress.c,v 1.10 2000/02/25 05:06:27 itojun Exp $"; 32 #endif /* LIBC_SCCS and not lint */ 33 34 /* 35 * get_myaddress.c 36 * 37 * Get client's IP address via ioctl. This avoids using the yellowpages. 38 * Copyright (C) 1984, Sun Microsystems, Inc. 39 */ 40 41 #include <rpc/types.h> 42 #include <rpc/xdr.h> 43 #include <rpc/pmap_prot.h> 44 #include <sys/socket.h> 45 #include <stdio.h> 46 #include <stdlib.h> 47 #include <unistd.h> 48 #include <net/if.h> 49 #include <netinet/in.h> 50 #include <ifaddrs.h> 51 52 /* 53 * don't use gethostbyname, which would invoke yellow pages 54 * 55 * Avoid loopback interfaces. We return information from a loopback 56 * interface only if there are no other possible interfaces. 57 */ 58 int 59 get_myaddress(addr) 60 struct sockaddr_in *addr; 61 { 62 struct ifaddrs *ifap, *ifa; 63 int loopback = 0, gotit = 0; 64 65 if (getifaddrs(&ifap) != 0) 66 return (-1); 67 68 again: 69 for (ifa = ifap; ifa; ifa = ifa->ifa_next) { 70 if ((ifa->ifa_flags & IFF_UP) && 71 ifa->ifa_addr->sa_family == AF_INET && 72 (loopback == 1 && (ifa->ifa_flags & IFF_LOOPBACK))) { 73 *addr = *((struct sockaddr_in *)ifa->ifa_addr); 74 addr->sin_port = htons(PMAPPORT); 75 gotit = 1; 76 break; 77 } 78 } 79 if (gotit == 0 && loopback == 0) { 80 loopback = 1; 81 goto again; 82 } 83 freeifaddrs(ifap); 84 return (0); 85 } 86