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.
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.
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.
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.
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.
25 * Sun Microsystems, Inc.
27 * Mountain View, California 94043
29 * @(#)get_myaddress.c 1.4 87/08/11 Copyr 1984 Sun Micro
30 * @(#)get_myaddress.c 2.1 88/07/29 4.0 RPCSRC
31 * $FreeBSD: src/lib/libc/rpc/get_myaddress.c,v 1.18.2.1 2003/01/01 23:55:34 jdp Exp $
32 * $DragonFly: src/lib/libc/rpc/get_myaddress.c,v 1.5 2007/11/25 01:28:22 swildner Exp $
38 * Get client's IP address via ioctl. This avoids using the yellowpages.
39 * Copyright (C) 1984, Sun Microsystems, Inc.
42 #include "namespace.h"
43 #include <rpc/types.h>
45 #include <rpc/pmap_prot.h>
46 #include <sys/socket.h>
51 #include <sys/ioctl.h>
52 #include <netinet/in.h>
53 #include <arpa/inet.h>
54 #include "un-namespace.h"
57 * don't use gethostbyname, which would invoke yellow pages
59 * Avoid loopback interfaces. We return information from a loopback
60 * interface only if there are no other possible interfaces.
63 get_myaddress(struct sockaddr_in
*addr
)
68 struct ifreq ifreq
, *ifr
, *end
;
69 int loopback
= 0, gotit
= 0;
71 if ((s
= _socket(AF_INET
, SOCK_DGRAM
, 0)) < 0) {
74 ifc
.ifc_len
= sizeof (buf
);
76 if (_ioctl(s
, SIOCGIFCONF
, (char *)&ifc
) < 0) {
82 end
= (struct ifreq
*) (ifc
.ifc_buf
+ ifc
.ifc_len
);
85 memcpy(&ifreq
, ifr
, sizeof(ifreq
));
86 if (_ioctl(s
, SIOCGIFFLAGS
, (char *)&ifreq
) < 0) {
90 if (((ifreq
.ifr_flags
& IFF_UP
) &&
91 ifr
->ifr_addr
.sa_family
== AF_INET
&&
92 !(ifreq
.ifr_flags
& IFF_LOOPBACK
) &&
93 ((struct sockaddr_in
*)&ifr
->ifr_addr
)->sin_addr
.s_addr
95 (loopback
== 1 && (ifreq
.ifr_flags
& IFF_LOOPBACK
)
96 && (ifr
->ifr_addr
.sa_family
== AF_INET
)
97 && (ifreq
.ifr_flags
& IFF_UP
))) {
98 *addr
= *((struct sockaddr_in
*)&ifr
->ifr_addr
);
99 addr
->sin_port
= htons(PMAPPORT
);
103 if (ifr
->ifr_addr
.sa_len
)
104 ifr
= (struct ifreq
*) ((caddr_t
) ifr
+
105 ifr
->ifr_addr
.sa_len
-
106 sizeof(struct sockaddr
));
109 if (gotit
== 0 && loopback
== 0) {
114 return (gotit
? 0 : -1);