7019f59e32
to fail under certain circumstances. 1. In one spot, the ifr_flags member was being examined in the wrong structure, thus it contained garbage. On a machine in which only the loopback interface was up, this caused everything that wanted to talk to the portmapper to fail -- a particular problem with laptops, where the pccard ethernet interface is likely to come up long after the attempt to start mountd, nfsd, amd, etc. 2. Compounding the above problem, get_myaddress() returned a successful status even though it failed to find an address that it considered good enough.
113 lines
3.3 KiB
C
113 lines
3.3 KiB
C
/*
|
|
* Sun RPC is a product of Sun Microsystems, Inc. and is provided for
|
|
* unrestricted use provided that this legend is included on all tape
|
|
* media and as a part of the software program in whole or part. Users
|
|
* may copy or modify Sun RPC without charge, but are not authorized
|
|
* to license or distribute it to anyone else except as part of a product or
|
|
* program developed by the user.
|
|
*
|
|
* SUN RPC IS PROVIDED AS IS WITH NO WARRANTIES OF ANY KIND INCLUDING THE
|
|
* WARRANTIES OF DESIGN, MERCHANTIBILITY AND FITNESS FOR A PARTICULAR
|
|
* PURPOSE, OR ARISING FROM A COURSE OF DEALING, USAGE OR TRADE PRACTICE.
|
|
*
|
|
* Sun RPC is provided with no support and without any obligation on the
|
|
* part of Sun Microsystems, Inc. to assist in its use, correction,
|
|
* modification or enhancement.
|
|
*
|
|
* SUN MICROSYSTEMS, INC. SHALL HAVE NO LIABILITY WITH RESPECT TO THE
|
|
* INFRINGEMENT OF COPYRIGHTS, TRADE SECRETS OR ANY PATENTS BY SUN RPC
|
|
* OR ANY PART THEREOF.
|
|
*
|
|
* In no event will Sun Microsystems, Inc. be liable for any lost revenue
|
|
* or profits or other special, indirect and consequential damages, even if
|
|
* Sun has been advised of the possibility of such damages.
|
|
*
|
|
* Sun Microsystems, Inc.
|
|
* 2550 Garcia Avenue
|
|
* Mountain View, California 94043
|
|
*/
|
|
|
|
#if defined(LIBC_SCCS) && !defined(lint)
|
|
/*static char *sccsid = "from: @(#)get_myaddress.c 1.4 87/08/11 Copyr 1984 Sun Micro";*/
|
|
/*static char *sccsid = "from: @(#)get_myaddress.c 2.1 88/07/29 4.0 RPCSRC";*/
|
|
static char *rcsid = "$Id: get_myaddress.c,v 1.13 1997/09/21 23:04:51 wpaul Exp $";
|
|
#endif
|
|
|
|
/*
|
|
* get_myaddress.c
|
|
*
|
|
* Get client's IP address via ioctl. This avoids using the yellowpages.
|
|
* Copyright (C) 1984, Sun Microsystems, Inc.
|
|
*/
|
|
|
|
#include <rpc/types.h>
|
|
#include <rpc/xdr.h>
|
|
#include <rpc/pmap_prot.h>
|
|
#include <sys/socket.h>
|
|
#include <stdio.h>
|
|
#include <unistd.h>
|
|
#include <net/if.h>
|
|
#include <sys/ioctl.h>
|
|
#include <netinet/in.h>
|
|
#include <arpa/inet.h>
|
|
|
|
/*
|
|
* don't use gethostbyname, which would invoke yellow pages
|
|
*
|
|
* Avoid loopback interfaces. We return information from a loopback
|
|
* interface only if there are no other possible interfaces.
|
|
*/
|
|
int
|
|
get_myaddress(addr)
|
|
struct sockaddr_in *addr;
|
|
{
|
|
int s;
|
|
char buf[BUFSIZ];
|
|
struct ifconf ifc;
|
|
struct ifreq ifreq, *ifr, *end;
|
|
int loopback = 0, gotit = 0;
|
|
|
|
if ((s = socket(AF_INET, SOCK_DGRAM, 0)) < 0) {
|
|
return(-1);
|
|
}
|
|
ifc.ifc_len = sizeof (buf);
|
|
ifc.ifc_buf = buf;
|
|
if (ioctl(s, SIOCGIFCONF, (char *)&ifc) < 0) {
|
|
close(s);
|
|
return(-1);
|
|
}
|
|
again:
|
|
ifr = ifc.ifc_req;
|
|
end = (struct ifreq *) (ifc.ifc_buf + ifc.ifc_len);
|
|
|
|
while (ifr < end) {
|
|
ifreq = *ifr;
|
|
if (ioctl(s, SIOCGIFFLAGS, (char *)&ifreq) < 0) {
|
|
close(s);
|
|
return(-1);
|
|
}
|
|
if (((ifreq.ifr_flags & IFF_UP) &&
|
|
ifr->ifr_addr.sa_family == AF_INET &&
|
|
!(ifreq.ifr_flags & IFF_LOOPBACK)) ||
|
|
(loopback == 1 && (ifreq.ifr_flags & IFF_LOOPBACK)
|
|
&& (ifr->ifr_addr.sa_family == AF_INET)
|
|
&& (ifreq.ifr_flags & IFF_UP))) {
|
|
*addr = *((struct sockaddr_in *)&ifr->ifr_addr);
|
|
addr->sin_port = htons(PMAPPORT);
|
|
gotit = 1;
|
|
break;
|
|
}
|
|
if (ifr->ifr_addr.sa_len)
|
|
ifr = (struct ifreq *) ((caddr_t) ifr +
|
|
ifr->ifr_addr.sa_len -
|
|
sizeof(struct sockaddr));
|
|
ifr++;
|
|
}
|
|
if (gotit == 0 && loopback == 0) {
|
|
loopback = 1;
|
|
goto again;
|
|
}
|
|
(void) close(s);
|
|
return (gotit ? 0 : -1);
|
|
}
|