1 /* @(#)get_myaddress.c 2.1 88/07/29 4.0 RPCSRC */ 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 #if !defined(lint) && defined(SCCSIDS) 31 static char sccsid[] = "@(#)get_myaddress.c 1.4 87/08/11 Copyr 1984 Sun Micro"; 32 #endif 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/pmap_prot.h> 43 #include <sys/socket.h> 44 #include <stdio.h> 45 #include <net/if.h> 46 #include <sys/ioctl.h> 47 #include <netinet/in.h> 48 #include <arpa/inet.h> 49 50 /* 51 * don't use gethostbyname, which would invoke yellow pages 52 */ 53 get_myaddress(addr) 54 struct sockaddr_in *addr; 55 { 56 int s; 57 char buf[BUFSIZ]; 58 struct ifconf ifc; 59 struct ifreq ifreq, *ifr; 60 int len, slop; 61 62 if ((s = socket(AF_INET, SOCK_DGRAM, 0)) < 0) { 63 perror("get_myaddress: socket"); 64 exit(1); 65 } 66 ifc.ifc_len = sizeof (buf); 67 ifc.ifc_buf = buf; 68 if (ioctl(s, SIOCGIFCONF, (char *)&ifc) < 0) { 69 perror("get_myaddress: ioctl (get interface configuration)"); 70 exit(1); 71 } 72 ifr = ifc.ifc_req; 73 for (len = ifc.ifc_len; len; len -= sizeof ifreq) { 74 ifreq = *ifr; 75 if (ioctl(s, SIOCGIFFLAGS, (char *)&ifreq) < 0) { 76 perror("get_myaddress: ioctl"); 77 exit(1); 78 } 79 if ((ifreq.ifr_flags & IFF_UP) && 80 ifr->ifr_addr.sa_family == AF_INET) { 81 *addr = *((struct sockaddr_in *)&ifr->ifr_addr); 82 addr->sin_port = htons(PMAPPORT); 83 break; 84 } 85 /* 86 * Deal with variable length addresses 87 */ 88 slop = ifr->ifr_addr.sa_len - sizeof (struct sockaddr); 89 if (slop) { 90 ifr = (struct ifreq *) ((caddr_t)ifr + slop); 91 len -= slop; 92 } 93 ifr++; 94 } 95 (void) close(s); 96 } 97