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Diffstat (limited to 'sunrpc/get_myaddr.c')
-rw-r--r--sunrpc/get_myaddr.c32
1 files changed, 21 insertions, 11 deletions
diff --git a/sunrpc/get_myaddr.c b/sunrpc/get_myaddr.c
index d45cb6d908..757fe06718 100644
--- a/sunrpc/get_myaddr.c
+++ b/sunrpc/get_myaddr.c
@@ -1,4 +1,4 @@
-/* @(#)get_myaddress.c 2.1 88/07/29 4.0 RPCSRC */
+/* @(#)get_myaddress.c 2.1 88/07/29 4.0 RPCSRC */
/*
* Sun RPC is a product of Sun Microsystems, Inc. and is provided for
* unrestricted use provided that this legend is included on all tape
@@ -38,13 +38,11 @@ static char sccsid[] = "@(#)get_myaddress.c 1.4 87/08/11 Copyr 1984 Sun Micro";
* Copyright (C) 1984, Sun Microsystems, Inc.
*/
-#include <unistd.h>
#include <rpc/types.h>
#include <rpc/pmap_prot.h>
#include <sys/socket.h>
#include <stdio.h>
-#undef _POSIX_SOURCE /* Ultrix <sys/param.h> needs --roland@gnu */
-#include <sys/param.h> /* Ultrix needs before net/if --roland@gnu */
+#include <unistd.h>
#include <net/if.h>
#include <sys/ioctl.h>
/* Order of following two #includes reversed by roland@gnu */
@@ -53,6 +51,9 @@ static char sccsid[] = "@(#)get_myaddress.c 1.4 87/08/11 Copyr 1984 Sun Micro";
/*
* 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.
*/
void
get_myaddress (struct sockaddr_in *addr)
@@ -61,7 +62,7 @@ get_myaddress (struct sockaddr_in *addr)
char buf[BUFSIZ];
struct ifconf ifc;
struct ifreq ifreq, *ifr;
- int len;
+ int len, loopback = 0;
if ((s = socket (AF_INET, SOCK_DGRAM, 0)) < 0)
{
@@ -75,23 +76,32 @@ get_myaddress (struct sockaddr_in *addr)
perror (_("get_myaddress: ioctl (get interface configuration)"));
exit (1);
}
+
+ again:
ifr = ifc.ifc_req;
for (len = ifc.ifc_len; len; len -= sizeof ifreq)
{
ifreq = *ifr;
if (ioctl (s, SIOCGIFFLAGS, (char *) &ifreq) < 0)
{
- perror ("get_myaddress: ioctl");
- exit (1);
+ perror ("get_myaddress: ioctl");
+ exit (1);
}
- if ((ifreq.ifr_flags & IFF_UP) &&
- ifr->ifr_addr.sa_family == AF_INET)
+ 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))))
{
*addr = *((struct sockaddr_in *) &ifr->ifr_addr);
addr->sin_port = htons (PMAPPORT);
- break;
+ close (s);
+ return;
}
ifr++;
}
- (void) close (s);
+ if (loopback == 0)
+ {
+ loopback = 1;
+ goto again;
+ }
+ close (s);
}