1*9b7a920aSLexi Winter /*
2*9b7a920aSLexi Winter * Copyright (c) 1997, 1998, 1999, 2000
3*9b7a920aSLexi Winter * The Regents of the University of California. All rights reserved.
4*9b7a920aSLexi Winter *
5*9b7a920aSLexi Winter * Redistribution and use in source and binary forms, with or without
6*9b7a920aSLexi Winter * modification, are permitted provided that the following conditions
7*9b7a920aSLexi Winter * are met:
8*9b7a920aSLexi Winter * 1. Redistributions of source code must retain the above copyright
9*9b7a920aSLexi Winter * notice, this list of conditions and the following disclaimer.
10*9b7a920aSLexi Winter * 2. Redistributions in binary form must reproduce the above copyright
11*9b7a920aSLexi Winter * notice, this list of conditions and the following disclaimer in the
12*9b7a920aSLexi Winter * documentation and/or other materials provided with the distribution.
13*9b7a920aSLexi Winter * 3. All advertising materials mentioning features or use of this software
14*9b7a920aSLexi Winter * must display the following acknowledgement:
15*9b7a920aSLexi Winter * This product includes software developed by the Computer Systems
16*9b7a920aSLexi Winter * Engineering Group at Lawrence Berkeley Laboratory.
17*9b7a920aSLexi Winter * 4. Neither the name of the University nor of the Laboratory may be used
18*9b7a920aSLexi Winter * to endorse or promote products derived from this software without
19*9b7a920aSLexi Winter * specific prior written permission.
20*9b7a920aSLexi Winter *
21*9b7a920aSLexi Winter * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
22*9b7a920aSLexi Winter * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
23*9b7a920aSLexi Winter * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
24*9b7a920aSLexi Winter * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
25*9b7a920aSLexi Winter * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
26*9b7a920aSLexi Winter * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
27*9b7a920aSLexi Winter * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
28*9b7a920aSLexi Winter * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
29*9b7a920aSLexi Winter * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
30*9b7a920aSLexi Winter * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
31*9b7a920aSLexi Winter * SUCH DAMAGE.
32*9b7a920aSLexi Winter */
33*9b7a920aSLexi Winter
34*9b7a920aSLexi Winter #include <sys/param.h>
35*9b7a920aSLexi Winter #include <sys/file.h>
36*9b7a920aSLexi Winter #include <sys/ioctl.h>
37*9b7a920aSLexi Winter #include <sys/socket.h>
38*9b7a920aSLexi Winter #include <sys/sockio.h>
39*9b7a920aSLexi Winter #include <sys/time.h> /* concession to AIX */
40*9b7a920aSLexi Winter
41*9b7a920aSLexi Winter #if __STDC__
42*9b7a920aSLexi Winter struct mbuf;
43*9b7a920aSLexi Winter struct rtentry;
44*9b7a920aSLexi Winter #endif
45*9b7a920aSLexi Winter
46*9b7a920aSLexi Winter #include <net/if.h>
47*9b7a920aSLexi Winter #include <netinet/in.h>
48*9b7a920aSLexi Winter
49*9b7a920aSLexi Winter #include <ctype.h>
50*9b7a920aSLexi Winter #include <errno.h>
51*9b7a920aSLexi Winter #include <memory.h>
52*9b7a920aSLexi Winter #include <stdio.h>
53*9b7a920aSLexi Winter #include <stdlib.h>
54*9b7a920aSLexi Winter #include <string.h>
55*9b7a920aSLexi Winter #include <unistd.h>
56*9b7a920aSLexi Winter
57*9b7a920aSLexi Winter #include "ifaddrlist.h"
58*9b7a920aSLexi Winter
59*9b7a920aSLexi Winter /*
60*9b7a920aSLexi Winter * Return the interface list
61*9b7a920aSLexi Winter */
62*9b7a920aSLexi Winter int
ifaddrlist(register struct ifaddrlist ** ipaddrp,register char * errbuf)63*9b7a920aSLexi Winter ifaddrlist(register struct ifaddrlist **ipaddrp, register char *errbuf)
64*9b7a920aSLexi Winter {
65*9b7a920aSLexi Winter register int fd, nipaddr;
66*9b7a920aSLexi Winter size_t n;
67*9b7a920aSLexi Winter register struct ifreq *ifrp, *ifend, *ifnext;
68*9b7a920aSLexi Winter register struct sockaddr_in *sin;
69*9b7a920aSLexi Winter register struct ifaddrlist *al;
70*9b7a920aSLexi Winter struct ifconf ifc;
71*9b7a920aSLexi Winter struct ifreq ibuf[(32 * 1024) / sizeof(struct ifreq)], ifr;
72*9b7a920aSLexi Winter #define MAX_IPADDR ((int)(sizeof(ibuf) / sizeof(ibuf[0])))
73*9b7a920aSLexi Winter static struct ifaddrlist ifaddrlist[MAX_IPADDR];
74*9b7a920aSLexi Winter char device[sizeof(ifr.ifr_name) + 1];
75*9b7a920aSLexi Winter
76*9b7a920aSLexi Winter fd = socket(AF_INET, SOCK_DGRAM, 0);
77*9b7a920aSLexi Winter if (fd < 0) {
78*9b7a920aSLexi Winter (void)sprintf(errbuf, "socket: %s", strerror(errno));
79*9b7a920aSLexi Winter return (-1);
80*9b7a920aSLexi Winter }
81*9b7a920aSLexi Winter ifc.ifc_len = sizeof(ibuf);
82*9b7a920aSLexi Winter ifc.ifc_buf = (caddr_t)ibuf;
83*9b7a920aSLexi Winter
84*9b7a920aSLexi Winter if (ioctl(fd, SIOCGIFCONF, (char *)&ifc) < 0 ||
85*9b7a920aSLexi Winter ifc.ifc_len < (int)sizeof(struct ifreq)) {
86*9b7a920aSLexi Winter if (errno == EINVAL)
87*9b7a920aSLexi Winter (void)sprintf(errbuf,
88*9b7a920aSLexi Winter "SIOCGIFCONF: ifreq struct too small (%zu bytes)",
89*9b7a920aSLexi Winter sizeof(ibuf));
90*9b7a920aSLexi Winter else
91*9b7a920aSLexi Winter (void)sprintf(errbuf, "SIOCGIFCONF: %s",
92*9b7a920aSLexi Winter strerror(errno));
93*9b7a920aSLexi Winter (void)close(fd);
94*9b7a920aSLexi Winter return (-1);
95*9b7a920aSLexi Winter }
96*9b7a920aSLexi Winter ifrp = ibuf;
97*9b7a920aSLexi Winter ifend = (struct ifreq *)((char *)ibuf + ifc.ifc_len);
98*9b7a920aSLexi Winter
99*9b7a920aSLexi Winter al = ifaddrlist;
100*9b7a920aSLexi Winter nipaddr = 0;
101*9b7a920aSLexi Winter for (; ifrp < ifend; ifrp = ifnext) {
102*9b7a920aSLexi Winter n = ifrp->ifr_addr.sa_len + sizeof(ifrp->ifr_name);
103*9b7a920aSLexi Winter if (n < sizeof(*ifrp))
104*9b7a920aSLexi Winter ifnext = ifrp + 1;
105*9b7a920aSLexi Winter else
106*9b7a920aSLexi Winter ifnext = (struct ifreq *)((char *)ifrp + n);
107*9b7a920aSLexi Winter if (ifrp->ifr_addr.sa_family != AF_INET)
108*9b7a920aSLexi Winter continue;
109*9b7a920aSLexi Winter /*
110*9b7a920aSLexi Winter * Need a template to preserve address info that is
111*9b7a920aSLexi Winter * used below to locate the next entry. (Otherwise,
112*9b7a920aSLexi Winter * SIOCGIFFLAGS stomps over it because the requests
113*9b7a920aSLexi Winter * are returned in a union.)
114*9b7a920aSLexi Winter */
115*9b7a920aSLexi Winter strncpy(ifr.ifr_name, ifrp->ifr_name, sizeof(ifr.ifr_name));
116*9b7a920aSLexi Winter if (ioctl(fd, SIOCGIFFLAGS, (char *)&ifr) < 0) {
117*9b7a920aSLexi Winter if (errno == ENXIO)
118*9b7a920aSLexi Winter continue;
119*9b7a920aSLexi Winter (void)sprintf(errbuf, "SIOCGIFFLAGS: %.*s: %s",
120*9b7a920aSLexi Winter (int)sizeof(ifr.ifr_name), ifr.ifr_name,
121*9b7a920aSLexi Winter strerror(errno));
122*9b7a920aSLexi Winter (void)close(fd);
123*9b7a920aSLexi Winter return (-1);
124*9b7a920aSLexi Winter }
125*9b7a920aSLexi Winter
126*9b7a920aSLexi Winter /* Must be up */
127*9b7a920aSLexi Winter if ((ifr.ifr_flags & IFF_UP) == 0)
128*9b7a920aSLexi Winter continue;
129*9b7a920aSLexi Winter
130*9b7a920aSLexi Winter
131*9b7a920aSLexi Winter (void)strlcpy(device, ifr.ifr_name, sizeof(device));
132*9b7a920aSLexi Winter #ifdef sun
133*9b7a920aSLexi Winter /* Ignore sun virtual interfaces */
134*9b7a920aSLexi Winter if (strchr(device, ':') != NULL)
135*9b7a920aSLexi Winter continue;
136*9b7a920aSLexi Winter #endif
137*9b7a920aSLexi Winter if (ioctl(fd, SIOCGIFADDR, (char *)&ifr) < 0) {
138*9b7a920aSLexi Winter (void)sprintf(errbuf, "SIOCGIFADDR: %s: %s",
139*9b7a920aSLexi Winter device, strerror(errno));
140*9b7a920aSLexi Winter (void)close(fd);
141*9b7a920aSLexi Winter return (-1);
142*9b7a920aSLexi Winter }
143*9b7a920aSLexi Winter
144*9b7a920aSLexi Winter if (nipaddr >= MAX_IPADDR) {
145*9b7a920aSLexi Winter (void)sprintf(errbuf, "Too many interfaces (%d)",
146*9b7a920aSLexi Winter MAX_IPADDR);
147*9b7a920aSLexi Winter (void)close(fd);
148*9b7a920aSLexi Winter return (-1);
149*9b7a920aSLexi Winter }
150*9b7a920aSLexi Winter sin = (struct sockaddr_in *)&ifr.ifr_addr;
151*9b7a920aSLexi Winter al->addr = sin->sin_addr.s_addr;
152*9b7a920aSLexi Winter al->device = strdup(device);
153*9b7a920aSLexi Winter ++al;
154*9b7a920aSLexi Winter ++nipaddr;
155*9b7a920aSLexi Winter }
156*9b7a920aSLexi Winter (void)close(fd);
157*9b7a920aSLexi Winter
158*9b7a920aSLexi Winter *ipaddrp = ifaddrlist;
159*9b7a920aSLexi Winter return (nipaddr);
160*9b7a920aSLexi Winter }
161