1*0Sstevel@tonic-gate /*
2*0Sstevel@tonic-gate * CDDL HEADER START
3*0Sstevel@tonic-gate *
4*0Sstevel@tonic-gate * The contents of this file are subject to the terms of the
5*0Sstevel@tonic-gate * Common Development and Distribution License, Version 1.0 only
6*0Sstevel@tonic-gate * (the "License"). You may not use this file except in compliance
7*0Sstevel@tonic-gate * with the License.
8*0Sstevel@tonic-gate *
9*0Sstevel@tonic-gate * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
10*0Sstevel@tonic-gate * or http://www.opensolaris.org/os/licensing.
11*0Sstevel@tonic-gate * See the License for the specific language governing permissions
12*0Sstevel@tonic-gate * and limitations under the License.
13*0Sstevel@tonic-gate *
14*0Sstevel@tonic-gate * When distributing Covered Code, include this CDDL HEADER in each
15*0Sstevel@tonic-gate * file and include the License file at usr/src/OPENSOLARIS.LICENSE.
16*0Sstevel@tonic-gate * If applicable, add the following below this CDDL HEADER, with the
17*0Sstevel@tonic-gate * fields enclosed by brackets "[]" replaced with your own identifying
18*0Sstevel@tonic-gate * information: Portions Copyright [yyyy] [name of copyright owner]
19*0Sstevel@tonic-gate *
20*0Sstevel@tonic-gate * CDDL HEADER END
21*0Sstevel@tonic-gate */
22*0Sstevel@tonic-gate #pragma ident "%Z%%M% %I% %E% SMI"
23*0Sstevel@tonic-gate
24*0Sstevel@tonic-gate /*
25*0Sstevel@tonic-gate * get_myaddress.c
26*0Sstevel@tonic-gate *
27*0Sstevel@tonic-gate * Get client's IP address via ioctl. This avoids using the NIS.
28*0Sstevel@tonic-gate * Copyright (C) 1990, Sun Microsystems, Inc.
29*0Sstevel@tonic-gate */
30*0Sstevel@tonic-gate
31*0Sstevel@tonic-gate #include <rpc/types.h>
32*0Sstevel@tonic-gate #include <rpc/pmap_prot.h>
33*0Sstevel@tonic-gate #include <sys/socket.h>
34*0Sstevel@tonic-gate #include <sys/sockio.h>
35*0Sstevel@tonic-gate #include <stdio.h>
36*0Sstevel@tonic-gate #include <net/if.h>
37*0Sstevel@tonic-gate #include <sys/ioctl.h>
38*0Sstevel@tonic-gate #include <arpa/inet.h>
39*0Sstevel@tonic-gate #include <netinet/in.h>
40*0Sstevel@tonic-gate #include <syslog.h>
41*0Sstevel@tonic-gate #include <malloc.h>
42*0Sstevel@tonic-gate #include <unistd.h>
43*0Sstevel@tonic-gate #include <stropts.h>
44*0Sstevel@tonic-gate #include <stdlib.h>
45*0Sstevel@tonic-gate #include <errno.h>
46*0Sstevel@tonic-gate
47*0Sstevel@tonic-gate /*
48*0Sstevel@tonic-gate * don't use gethostbyname, which would invoke NIS
49*0Sstevel@tonic-gate */
50*0Sstevel@tonic-gate void
get_myaddress(struct sockaddr_in * addr)51*0Sstevel@tonic-gate get_myaddress(struct sockaddr_in *addr)
52*0Sstevel@tonic-gate {
53*0Sstevel@tonic-gate int s;
54*0Sstevel@tonic-gate struct ifconf ifc;
55*0Sstevel@tonic-gate struct ifreq ifreq, *ifr;
56*0Sstevel@tonic-gate int len, numifs;
57*0Sstevel@tonic-gate int ret;
58*0Sstevel@tonic-gate
59*0Sstevel@tonic-gate if ((s = socket(AF_INET, SOCK_DGRAM, 0)) < 0) {
60*0Sstevel@tonic-gate syslog(LOG_ERR, "get_myaddress: socket: %m");
61*0Sstevel@tonic-gate exit(1);
62*0Sstevel@tonic-gate }
63*0Sstevel@tonic-gate
64*0Sstevel@tonic-gate do {
65*0Sstevel@tonic-gate ret = ioctl(s, SIOCGIFNUM, (char *)&numifs);
66*0Sstevel@tonic-gate } while (ret < 0 && (errno == EINTR || errno == EAGAIN));
67*0Sstevel@tonic-gate if (ret < 0) {
68*0Sstevel@tonic-gate syslog(LOG_ERR, "get_myaddress: ioctl: %m");
69*0Sstevel@tonic-gate exit(1);
70*0Sstevel@tonic-gate }
71*0Sstevel@tonic-gate
72*0Sstevel@tonic-gate ifc.ifc_len = numifs * sizeof (struct ifreq);
73*0Sstevel@tonic-gate if ((ifc.ifc_buf = (caddr_t)malloc(ifc.ifc_len)) == NULL) {
74*0Sstevel@tonic-gate syslog(LOG_ERR, "get_myaddress: malloc: %m");
75*0Sstevel@tonic-gate exit(1);
76*0Sstevel@tonic-gate }
77*0Sstevel@tonic-gate
78*0Sstevel@tonic-gate do {
79*0Sstevel@tonic-gate ret = ioctl(s, SIOCGIFCONF, (char *)&ifc);
80*0Sstevel@tonic-gate } while (ret < 0 && (errno == EINTR || errno == EAGAIN));
81*0Sstevel@tonic-gate if (ret < 0) {
82*0Sstevel@tonic-gate syslog(LOG_ERR,
83*0Sstevel@tonic-gate "get_myaddress: ioctl (get interface configuration): %m");
84*0Sstevel@tonic-gate exit(1);
85*0Sstevel@tonic-gate }
86*0Sstevel@tonic-gate
87*0Sstevel@tonic-gate /*
88*0Sstevel@tonic-gate * set default to loopback in case nothing is found.
89*0Sstevel@tonic-gate */
90*0Sstevel@tonic-gate addr->sin_family = AF_INET;
91*0Sstevel@tonic-gate addr->sin_addr.s_addr = htonl(INADDR_LOOPBACK);
92*0Sstevel@tonic-gate addr->sin_port = htons(PMAPPORT);
93*0Sstevel@tonic-gate
94*0Sstevel@tonic-gate ifr = ifc.ifc_req;
95*0Sstevel@tonic-gate for (len = ifc.ifc_len; len > 0; len -= sizeof (ifreq), ifr++) {
96*0Sstevel@tonic-gate ifreq = *ifr;
97*0Sstevel@tonic-gate do {
98*0Sstevel@tonic-gate ret = ioctl(s, SIOCGIFFLAGS, (char *)&ifreq);
99*0Sstevel@tonic-gate } while (ret < 0 && (errno == EINTR || errno == EAGAIN));
100*0Sstevel@tonic-gate if (ret < 0) {
101*0Sstevel@tonic-gate syslog(LOG_ERR, "get_myaddress: ioctl: %m");
102*0Sstevel@tonic-gate exit(1);
103*0Sstevel@tonic-gate }
104*0Sstevel@tonic-gate if (ifr->ifr_addr.sa_family != AF_INET)
105*0Sstevel@tonic-gate continue;
106*0Sstevel@tonic-gate if ((ifreq.ifr_flags & IFF_UP) == 0)
107*0Sstevel@tonic-gate continue;
108*0Sstevel@tonic-gate if (ifreq.ifr_flags & IFF_LOOPBACK)
109*0Sstevel@tonic-gate continue;
110*0Sstevel@tonic-gate if ((ifreq.ifr_flags & (IFF_MULTICAST | IFF_BROADCAST)) == 0)
111*0Sstevel@tonic-gate continue;
112*0Sstevel@tonic-gate *addr = *((struct sockaddr_in *)&ifr->ifr_addr);
113*0Sstevel@tonic-gate addr->sin_port = htons(PMAPPORT);
114*0Sstevel@tonic-gate break;
115*0Sstevel@tonic-gate }
116*0Sstevel@tonic-gate free(ifc.ifc_buf);
117*0Sstevel@tonic-gate (void) close(s);
118*0Sstevel@tonic-gate }
119