b1d8279802
The logic in get_myaddress() is broken: it always returns the loopback
address due to the following rule:
if ((ifreq.ifr_flags & IFF_UP) &&
ifr->ifr_addr.sa_family == AF_INET &&
(loopback == 1 && (ifreq.ifr_flags & IFF_LOOPBACK))) {
The idea is that we want to select the interface address only if it's
up and it's in the AF_INET family. If it turns uout we don't have
such an interface available, we make a second pass through the loop,
this time settling for the loopback interface. But the logic inadvertently
locks out all cases when loopback == 0, so nothing is ever selected until
the second pass (when loopback == 1).
This is changed to:
if (((ifreq.ifr_flags & IFF_UP) &&
ifr->ifr_addr.sa_family == AF_INET) ||
(loopback == 1 && (ifreq.ifr_flags & IFF_LOOPBACK))) {
which I think does the right thing.
This is yet another bogon I discovered during NIS+ testing; I need
get_myaddress() to work correctly so that the callback code in the
client library will work.
110 lines
3.1 KiB
C
110 lines
3.1 KiB
C
/*
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* Sun RPC is a product of Sun Microsystems, Inc. and is provided for
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* unrestricted use provided that this legend is included on all tape
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* media and as a part of the software program in whole or part. Users
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* may copy or modify Sun RPC without charge, but are not authorized
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* to license or distribute it to anyone else except as part of a product or
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* program developed by the user.
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*
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* SUN RPC IS PROVIDED AS IS WITH NO WARRANTIES OF ANY KIND INCLUDING THE
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* WARRANTIES OF DESIGN, MERCHANTIBILITY AND FITNESS FOR A PARTICULAR
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* PURPOSE, OR ARISING FROM A COURSE OF DEALING, USAGE OR TRADE PRACTICE.
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*
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* Sun RPC is provided with no support and without any obligation on the
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* part of Sun Microsystems, Inc. to assist in its use, correction,
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* modification or enhancement.
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*
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* SUN MICROSYSTEMS, INC. SHALL HAVE NO LIABILITY WITH RESPECT TO THE
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* INFRINGEMENT OF COPYRIGHTS, TRADE SECRETS OR ANY PATENTS BY SUN RPC
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* OR ANY PART THEREOF.
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*
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* In no event will Sun Microsystems, Inc. be liable for any lost revenue
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* or profits or other special, indirect and consequential damages, even if
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* Sun has been advised of the possibility of such damages.
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*
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* Sun Microsystems, Inc.
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* 2550 Garcia Avenue
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* Mountain View, California 94043
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*/
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#if defined(LIBC_SCCS) && !defined(lint)
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/*static char *sccsid = "from: @(#)get_myaddress.c 1.4 87/08/11 Copyr 1984 Sun Micro";*/
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/*static char *sccsid = "from: @(#)get_myaddress.c 2.1 88/07/29 4.0 RPCSRC";*/
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static char *rcsid = "$Id: get_myaddress.c,v 1.11 1997/05/28 05:05:11 wpaul Exp $";
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#endif
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/*
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* get_myaddress.c
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*
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* Get client's IP address via ioctl. This avoids using the yellowpages.
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* Copyright (C) 1984, Sun Microsystems, Inc.
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*/
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#include <rpc/types.h>
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#include <rpc/xdr.h>
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#include <rpc/pmap_prot.h>
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#include <sys/socket.h>
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#include <stdio.h>
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#include <unistd.h>
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#include <net/if.h>
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#include <sys/ioctl.h>
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#include <netinet/in.h>
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#include <arpa/inet.h>
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/*
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* don't use gethostbyname, which would invoke yellow pages
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*
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* Avoid loopback interfaces. We return information from a loopback
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* interface only if there are no other possible interfaces.
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*/
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int
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get_myaddress(addr)
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struct sockaddr_in *addr;
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{
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int s;
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char buf[BUFSIZ];
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struct ifconf ifc;
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struct ifreq ifreq, *ifr, *end;
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int loopback = 0, gotit = 0;
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if ((s = socket(AF_INET, SOCK_DGRAM, 0)) < 0) {
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return(-1);
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}
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ifc.ifc_len = sizeof (buf);
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ifc.ifc_buf = buf;
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if (ioctl(s, SIOCGIFCONF, (char *)&ifc) < 0) {
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close(s);
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return(-1);
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}
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again:
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ifr = ifc.ifc_req;
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end = (struct ifreq *) (ifc.ifc_buf + ifc.ifc_len);
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while (ifr < end) {
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ifreq = *ifr;
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if (ioctl(s, SIOCGIFFLAGS, (char *)&ifreq) < 0) {
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close(s);
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return(-1);
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}
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if (((ifreq.ifr_flags & IFF_UP) &&
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ifr->ifr_addr.sa_family == AF_INET) ||
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(loopback == 1 && (ifreq.ifr_flags & IFF_LOOPBACK))) {
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*addr = *((struct sockaddr_in *)&ifr->ifr_addr);
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addr->sin_port = htons(PMAPPORT);
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gotit = 1;
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break;
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}
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if (ifr->ifr_addr.sa_len)
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ifr = (struct ifreq *) ((caddr_t) ifr +
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ifr->ifr_addr.sa_len -
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sizeof(struct sockaddr));
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ifr++;
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}
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if (gotit == 0 && loopback == 0) {
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loopback = 1;
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goto again;
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}
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(void) close(s);
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return (0);
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}
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