1 /*
2 * CDDL HEADER START
3 *
4 * The contents of this file are subject to the terms of the
5 * Common Development and Distribution License, Version 1.0 only
6 * (the "License"). You may not use this file except in compliance
7 * with the License.
8 *
9 * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
10 * or http://www.opensolaris.org/os/licensing.
11 * See the License for the specific language governing permissions
12 * and limitations under the License.
13 *
14 * When distributing Covered Code, include this CDDL HEADER in each
15 * file and include the License file at usr/src/OPENSOLARIS.LICENSE.
16 * If applicable, add the following below this CDDL HEADER, with the
17 * fields enclosed by brackets "[]" replaced with your own identifying
18 * information: Portions Copyright [yyyy] [name of copyright owner]
19 *
20 * CDDL HEADER END
21 */
22
23 /*
24 * get_myaddress.c
25 *
26 * Get client's IP address via ioctl. This avoids using the NIS.
27 * Copyright (C) 1990, Sun Microsystems, Inc.
28 */
29
30 #include <rpc/types.h>
31 #include <rpc/pmap_prot.h>
32 #include <sys/socket.h>
33 #include <sys/sockio.h>
34 #include <stdio.h>
35 #include <net/if.h>
36 #include <sys/ioctl.h>
37 #include <arpa/inet.h>
38 #include <netinet/in.h>
39 #include <syslog.h>
40 #include <malloc.h>
41 #include <unistd.h>
42 #include <stropts.h>
43 #include <stdlib.h>
44 #include <errno.h>
45
46 /*
47 * don't use gethostbyname, which would invoke NIS
48 */
49 void
get_myaddress(struct sockaddr_in * addr)50 get_myaddress(struct sockaddr_in *addr)
51 {
52 int s;
53 struct ifconf ifc;
54 struct ifreq ifreq, *ifr;
55 int len, numifs;
56 int ret;
57
58 if ((s = socket(AF_INET, SOCK_DGRAM, 0)) < 0) {
59 syslog(LOG_ERR, "get_myaddress: socket: %m");
60 exit(1);
61 }
62
63 do {
64 ret = ioctl(s, SIOCGIFNUM, (char *)&numifs);
65 } while (ret < 0 && (errno == EINTR || errno == EAGAIN));
66 if (ret < 0) {
67 syslog(LOG_ERR, "get_myaddress: ioctl: %m");
68 exit(1);
69 }
70
71 ifc.ifc_len = numifs * sizeof (struct ifreq);
72 if ((ifc.ifc_buf = (caddr_t)malloc(ifc.ifc_len)) == NULL) {
73 syslog(LOG_ERR, "get_myaddress: malloc: %m");
74 exit(1);
75 }
76
77 do {
78 ret = ioctl(s, SIOCGIFCONF, (char *)&ifc);
79 } while (ret < 0 && (errno == EINTR || errno == EAGAIN));
80 if (ret < 0) {
81 syslog(LOG_ERR,
82 "get_myaddress: ioctl (get interface configuration): %m");
83 exit(1);
84 }
85
86 /*
87 * set default to loopback in case nothing is found.
88 */
89 addr->sin_family = AF_INET;
90 addr->sin_addr.s_addr = htonl(INADDR_LOOPBACK);
91 addr->sin_port = htons(PMAPPORT);
92
93 ifr = ifc.ifc_req;
94 for (len = ifc.ifc_len; len > 0; len -= sizeof (ifreq), ifr++) {
95 ifreq = *ifr;
96 do {
97 ret = ioctl(s, SIOCGIFFLAGS, (char *)&ifreq);
98 } while (ret < 0 && (errno == EINTR || errno == EAGAIN));
99 if (ret < 0) {
100 syslog(LOG_ERR, "get_myaddress: ioctl: %m");
101 exit(1);
102 }
103 if (ifr->ifr_addr.sa_family != AF_INET)
104 continue;
105 if ((ifreq.ifr_flags & IFF_UP) == 0)
106 continue;
107 if (ifreq.ifr_flags & IFF_LOOPBACK)
108 continue;
109 if ((ifreq.ifr_flags & (IFF_MULTICAST | IFF_BROADCAST)) == 0)
110 continue;
111 *addr = *((struct sockaddr_in *)&ifr->ifr_addr);
112 addr->sin_port = htons(PMAPPORT);
113 break;
114 }
115 free(ifc.ifc_buf);
116 (void) close(s);
117 }
118