[df49c60] | 1 | /* |
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| 2 | * Sun RPC is a product of Sun Microsystems, Inc. and is provided for |
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| 3 | * unrestricted use provided that this legend is included on all tape |
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| 4 | * media and as a part of the software program in whole or part. Users |
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| 5 | * may copy or modify Sun RPC without charge, but are not authorized |
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| 6 | * to license or distribute it to anyone else except as part of a product or |
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| 7 | * program developed by the user. |
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| 8 | * |
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| 9 | * SUN RPC IS PROVIDED AS IS WITH NO WARRANTIES OF ANY KIND INCLUDING THE |
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| 10 | * WARRANTIES OF DESIGN, MERCHANTIBILITY AND FITNESS FOR A PARTICULAR |
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| 11 | * PURPOSE, OR ARISING FROM A COURSE OF DEALING, USAGE OR TRADE PRACTICE. |
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| 12 | * |
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| 13 | * Sun RPC is provided with no support and without any obligation on the |
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| 14 | * part of Sun Microsystems, Inc. to assist in its use, correction, |
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| 15 | * modification or enhancement. |
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| 16 | * |
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| 17 | * SUN MICROSYSTEMS, INC. SHALL HAVE NO LIABILITY WITH RESPECT TO THE |
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| 18 | * INFRINGEMENT OF COPYRIGHTS, TRADE SECRETS OR ANY PATENTS BY SUN RPC |
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| 19 | * OR ANY PART THEREOF. |
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| 20 | * |
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| 21 | * In no event will Sun Microsystems, Inc. be liable for any lost revenue |
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| 22 | * or profits or other special, indirect and consequential damages, even if |
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| 23 | * Sun has been advised of the possibility of such damages. |
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| 24 | * |
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| 25 | * Sun Microsystems, Inc. |
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| 26 | * 2550 Garcia Avenue |
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| 27 | * Mountain View, California 94043 |
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| 28 | */ |
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| 29 | |
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| 30 | #if defined(LIBC_SCCS) && !defined(lint) |
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| 31 | /*static char *sccsid = "from: @(#)get_myaddress.c 1.4 87/08/11 Copyr 1984 Sun Micro";*/ |
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| 32 | /*static char *sccsid = "from: @(#)get_myaddress.c 2.1 88/07/29 4.0 RPCSRC";*/ |
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| 33 | static char *rcsid = "$FreeBSD: src/lib/libc/rpc/get_myaddress.c,v 1.17 2000/01/27 23:06:37 jasone Exp $"; |
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| 34 | #endif |
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| 35 | |
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| 36 | /* |
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| 37 | * get_myaddress.c |
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| 38 | * |
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| 39 | * Get client's IP address via ioctl. This avoids using the yellowpages. |
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| 40 | * Copyright (C) 1984, Sun Microsystems, Inc. |
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| 41 | */ |
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| 42 | |
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| 43 | #include <rpc/types.h> |
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| 44 | #include <rpc/xdr.h> |
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| 45 | #include <rpc/pmap_prot.h> |
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| 46 | #include <sys/socket.h> |
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| 47 | #include <stdio.h> |
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| 48 | #include <unistd.h> |
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| 49 | #include <net/if.h> |
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| 50 | #include <sys/ioctl.h> |
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| 51 | #include <netinet/in.h> |
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| 52 | #include <arpa/inet.h> |
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| 53 | |
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| 54 | /* |
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| 55 | * don't use gethostbyname, which would invoke yellow pages |
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| 56 | * |
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| 57 | * Avoid loopback interfaces. We return information from a loopback |
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| 58 | * interface only if there are no other possible interfaces. |
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| 59 | */ |
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| 60 | int |
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| 61 | get_myaddress(addr) |
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| 62 | struct sockaddr_in *addr; |
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| 63 | { |
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| 64 | int s; |
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| 65 | char buf[BUFSIZ]; |
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| 66 | struct ifconf ifc; |
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| 67 | struct ifreq ifreq, *ifr, *end; |
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| 68 | int loopback = 0, gotit = 0; |
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| 69 | |
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| 70 | if ((s = socket(AF_INET, SOCK_DGRAM, 0)) < 0) { |
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| 71 | return(-1); |
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| 72 | } |
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| 73 | ifc.ifc_len = sizeof (buf); |
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| 74 | ifc.ifc_buf = buf; |
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| 75 | if (ioctl(s, SIOCGIFCONF, (char *)&ifc) < 0) { |
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[57cfaad] | 76 | _RPC_close(s); |
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[df49c60] | 77 | return(-1); |
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| 78 | } |
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| 79 | again: |
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| 80 | ifr = ifc.ifc_req; |
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| 81 | end = (struct ifreq *) (ifc.ifc_buf + ifc.ifc_len); |
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| 82 | |
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| 83 | while (ifr < end) { |
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| 84 | ifreq = *ifr; |
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| 85 | if (ioctl(s, SIOCGIFFLAGS, (char *)&ifreq) < 0) { |
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[57cfaad] | 86 | _RPC_close(s); |
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[df49c60] | 87 | return(-1); |
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| 88 | } |
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| 89 | if (((ifreq.ifr_flags & IFF_UP) && |
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| 90 | ifr->ifr_addr.sa_family == AF_INET && |
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| 91 | !(ifreq.ifr_flags & IFF_LOOPBACK)) || |
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| 92 | (loopback == 1 && (ifreq.ifr_flags & IFF_LOOPBACK) |
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| 93 | && (ifr->ifr_addr.sa_family == AF_INET) |
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| 94 | && (ifreq.ifr_flags & IFF_UP))) { |
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| 95 | *addr = *((struct sockaddr_in *)&ifr->ifr_addr); |
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| 96 | addr->sin_port = htons(PMAPPORT); |
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| 97 | gotit = 1; |
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| 98 | break; |
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| 99 | } |
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| 100 | if (ifr->ifr_addr.sa_len) |
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| 101 | ifr = (struct ifreq *) ((caddr_t) ifr + |
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| 102 | ifr->ifr_addr.sa_len - |
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| 103 | sizeof(struct sockaddr)); |
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| 104 | ifr++; |
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| 105 | } |
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| 106 | if (gotit == 0 && loopback == 0) { |
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| 107 | loopback = 1; |
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| 108 | goto again; |
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| 109 | } |
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[57cfaad] | 110 | (void)_RPC_close(s); |
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[df49c60] | 111 | return (gotit ? 0 : -1); |
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| 112 | } |
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