rpc.subproj/get_myaddress.c

   1 /*
   2  * Copyright (c) 1999 Apple Computer, Inc. All rights reserved.
   3  *
   4  * @APPLE_LICENSE_HEADER_START@
   5  *
   6  * Copyright (c) 1999-2003 Apple Computer, Inc.  All Rights Reserved.
   7  *
   8  * This file contains Original Code and/or Modifications of Original Code
   9  * as defined in and that are subject to the Apple Public Source License
  10  * Version 2.0 (the 'License'). You may not use this file except in
  11  * compliance with the License. Please obtain a copy of the License at
  12  * http://www.opensource.apple.com/apsl/ and read it before using this
  13  * file.
  14  *
  15  * The Original Code and all software distributed under the License are
  16  * distributed on an 'AS IS' basis, WITHOUT WARRANTY OF ANY KIND, EITHER
  17  * EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES,
  18  * INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY,
  19  * FITNESS FOR A PARTICULAR PURPOSE, QUIET ENJOYMENT OR NON-INFRINGEMENT.
  20  * Please see the License for the specific language governing rights and
  21  * limitations under the License.
  22  *
  23  * @APPLE_LICENSE_HEADER_END@
  24  */
  25 /*
  26  * Sun RPC is a product of Sun Microsystems, Inc. and is provided for
  27  * unrestricted use provided that this legend is included on all tape
  28  * media and as a part of the software program in whole or part.  Users
  29  * may copy or modify Sun RPC without charge, but are not authorized
  30  * to license or distribute it to anyone else except as part of a product or
  31  * program developed by the user.
  32  *
  33  * SUN RPC IS PROVIDED AS IS WITH NO WARRANTIES OF ANY KIND INCLUDING THE
  34  * WARRANTIES OF DESIGN, MERCHANTIBILITY AND FITNESS FOR A PARTICULAR
  35  * PURPOSE, OR ARISING FROM A COURSE OF DEALING, USAGE OR TRADE PRACTICE.
  36  *
  37  * Sun RPC is provided with no support and without any obligation on the
  38  * part of Sun Microsystems, Inc. to assist in its use, correction,
  39  * modification or enhancement.
  40  *
  41  * SUN MICROSYSTEMS, INC. SHALL HAVE NO LIABILITY WITH RESPECT TO THE
  42  * INFRINGEMENT OF COPYRIGHTS, TRADE SECRETS OR ANY PATENTS BY SUN RPC
  43  * OR ANY PART THEREOF.
  44  *
  45  * In no event will Sun Microsystems, Inc. be liable for any lost revenue
  46  * or profits or other special, indirect and consequential damages, even if
  47  * Sun has been advised of the possibility of such damages.
  48  *
  49  * Sun Microsystems, Inc.
  50  * 2550 Garcia Avenue
  51  * Mountain View, California  94043
  52  */
  53
  54 #if defined(LIBC_SCCS) && !defined(lint)
  55 /*static char *sccsid = "from: @(#)get_myaddress.c 1.4 87/08/11 Copyr 1984 Sun Micro";*/
  56 /*static char *sccsid = "from: @(#)get_myaddress.c      2.1 88/07/29 4.0 RPCSRC";*/
  57 static char *rcsid = "$Id: get_myaddress.c,v 1.4 2002/02/19 20:36:23 epeyton Exp $";
  58 #endif
  59
  60 /*
  61  * get_myaddress.c
  62  *
  63  * Get client's IP address via ioctl.  This avoids using the yellowpages.
  64  * Copyright (C) 1984, Sun Microsystems, Inc.
  65  *
  66  * Re-worked for 4.4BSD by Marc Majka at Apple.
  67  */
  68
  69 #include <rpc/types.h>
  70 #include <rpc/xdr.h>
  71 #include <rpc/pmap_prot.h>
  72 #include <sys/socket.h>
  73 #include <stdio.h>
  74 #include <string.h>
  75 #include <unistd.h>
  76 #include <net/if.h>
  77 #include <sys/ioctl.h>
  78 #include <netinet/in.h>
  79 #include <arpa/inet.h>
  80
  81 int
  82 get_myaddress(struct sockaddr_in *addr)
  83 {
  84         struct ifconf ifc;
  85         struct ifreq *ifr;
  86         char buf[BUFSIZ];
  87         int offset, x, addrlen, s;
  88
  89         bzero(addr, sizeof(struct sockaddr_in));
  90         addr->sin_family = AF_INET;
  91
  92         s = socket(AF_INET, SOCK_DGRAM, 0);
  93
  94         if (s < 0)
  95         {
  96                 addr->sin_addr.s_addr = htonl(INADDR_LOOPBACK);
  97                 return 0;
  98         }
  99
 100         ifc.ifc_len = sizeof(buf);
 101         ifc.ifc_buf = buf;
 102
 103         if (ioctl(s, SIOCGIFCONF, (char *)&ifc) < 0)
 104         {
 105                 addr->sin_addr.s_addr = htonl(INADDR_LOOPBACK);
 106                 close(s);
 107                 return 0;
 108         }
 109
 110         addrlen = sizeof(struct ifreq) - IFNAMSIZ;
 111         offset = 0;
 112
 113         while (offset <= ifc.ifc_len)
 114         {
 115                 ifr = (struct ifreq *)(ifc.ifc_buf + offset);
 116                 offset += IFNAMSIZ;
 117                 if (ifr->ifr_addr.sa_len > addrlen) offset += ifr->ifr_addr.sa_len;
 118                 else offset += addrlen;
 119
 120                 if (ifr->ifr_addr.sa_family != AF_INET) continue;
 121                 if (ioctl(s, SIOCGIFFLAGS, ifr) < 0) continue;
 122
 123                 x = ((struct sockaddr_in *)&(ifr->ifr_addr))->sin_addr.s_addr;
 124                 if
 125                 (
 126                         (ifr->ifr_flags & IFF_UP) &&
 127                         (!(ifr->ifr_flags & IFF_LOOPBACK)) &&
 128                         (x != 0) &&
 129                         (x != -1)
 130                 )
 131                 {
 132                         addr->sin_addr.s_addr = x;
 133                         close(s);
 134                         return 0;
 135                 }
 136         }
 137
 138         close(s);
 139         addr->sin_addr.s_addr = htonl(INADDR_LOOPBACK);
 140         return 0;
 141 }