source: rtems/cpukit/librpc/src/rpc/get_myaddress.c @ 344856b8

4.9
Last change on this file since 344856b8 was 344856b8, checked in by Jeffrey Hill <johill@…>, on 02/23/15 at 17:06:21

rpc: misaligned address exception in get_myaddress.c

updates #2249 see #1401

  • Property mode set to 100644
File size: 3.9 KB
Line 
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 *sccsid = "from: @(#)get_myaddress.c 1.4 87/08/11 Copyr 1984 Sun Micro";*/
32/*static char *sccsid = "from: @(#)get_myaddress.c      2.1 88/07/29 4.0 RPCSRC";*/
33static char *rcsid = "$FreeBSD: src/lib/libc/rpc/get_myaddress.c,v 1.17 2000/01/27 23:06:37 jasone Exp $";
34#endif
35
36/*
37 * get_myaddress.c
38 *
39 * Get client's IP address via ioctl.  This avoids using the yellowpages.
40 * Copyright (C) 1984, Sun Microsystems, Inc.
41 */
42
43#include <rpc/types.h>
44#include <rpc/xdr.h>
45#include <rpc/pmap_prot.h>
46#include <sys/socket.h>
47#include <stdio.h>
48#include <stdlib.h>
49#include <unistd.h>
50#include <net/if.h>
51#include <sys/ioctl.h>
52#include <netinet/in.h>
53#include <arpa/inet.h>
54
55
56/*
57 * Determine the size of an ifreq structure when addresses larger
58 * than the pifreq structure size may be returned from the kernel.
59 */
60static size_t ifreqSize ( struct ifreq *pifreq )
61{
62  size_t size = pifreq->ifr_addr.sa_len + sizeof(pifreq->ifr_name);
63  if ( size < sizeof ( *pifreq ) ) {
64    size = sizeof ( *pifreq );
65  }
66  return size;
67}
68
69/*
70 * don't use gethostbyname, which would invoke yellow pages
71 *
72 * Avoid loopback interfaces.  We return information from a loopback
73 * interface only if there are no other possible interfaces.
74 */
75int
76get_myaddress(
77        struct sockaddr_in *addr)
78{
79        int s;
80        struct ifconf ifc;
81        struct ifreq ifreq, *ifr;
82        int loopback = 0, gotit = 0;
83
84        if ((s = socket(AF_INET, SOCK_DGRAM, 0)) < 0) {
85                return(-1);
86        }
87again:
88        ifc.ifc_len = sizeof ( struct ifreq ) * 8u;
89        ifc.ifc_buf = malloc ( ifc.ifc_len );
90  if ( ! ifc.ifc_buf ) {
91                _RPC_close(s);
92    return -1;
93  }
94        if (ioctl(s, SIOCGIFCONF, (char *)&ifc) < 0) {
95                _RPC_close(s);
96    free ( ifc.ifc_buf );
97                return(-1);
98        }
99        ifr = ifc.ifc_req;
100
101        while ( ifc.ifc_len >= ifreqSize ( ifr ) ) {
102    ifreq = *ifr;
103                if (ioctl(s, SIOCGIFFLAGS, (char *) &ifreq ) < 0) {
104                        _RPC_close(s);
105      free ( ifc.ifc_buf );
106                        return(-1);
107                }
108                if (((ifreq.ifr_flags & IFF_UP) &&
109                    ifr->ifr_addr.sa_family == AF_INET &&
110                        !(ifreq.ifr_flags & IFF_LOOPBACK)) ||
111                    (loopback == 1 && (ifreq.ifr_flags & IFF_LOOPBACK)
112                        && (ifr->ifr_addr.sa_family == AF_INET)
113                        && (ifreq.ifr_flags &  IFF_UP))) {
114                        *addr = *((struct sockaddr_in *)&ifr->ifr_addr);
115                        addr->sin_port = htons(PMAPPORT);
116                        gotit = 1;
117                        break;
118                }
119
120    const size_t len = ifreqSize ( ifr );
121    ifc.ifc_len -= len;
122    /*
123     * RTEMS seems to require copy up to properly aligned
124     * boundary at the beginning of the buffer?
125     */
126    memmove ( ifr, len + (char *) ifr, ifc.ifc_len );
127        }
128        if (gotit == 0 && loopback == 0) {
129    free ( ifc.ifc_buf );
130                loopback = 1;
131                goto again;
132        }
133        (void)_RPC_close(s);
134  free ( ifc.ifc_buf );
135        return (gotit ? 0 : -1);
136}
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