1 /* $NetBSD: ifaddrlist.c,v 1.10 2011/09/11 01:06:26 christos Exp $ */
2
3 /*
4 * Copyright (c) 1997, 1998, 1999, 2000
5 * The Regents of the University of California. All rights reserved.
6 *
7 * Redistribution and use in source and binary forms, with or without
8 * modification, are permitted provided that the following conditions
9 * are met:
10 * 1. Redistributions of source code must retain the above copyright
11 * notice, this list of conditions and the following disclaimer.
12 * 2. Redistributions in binary form must reproduce the above copyright
13 * notice, this list of conditions and the following disclaimer in the
14 * documentation and/or other materials provided with the distribution.
15 * 3. All advertising materials mentioning features or use of this software
16 * must display the following acknowledgement:
17 * This product includes software developed by the Computer Systems
18 * Engineering Group at Lawrence Berkeley Laboratory.
19 * 4. Neither the name of the University nor of the Laboratory may be used
20 * to endorse or promote products derived from this software without
21 * specific prior written permission.
22 *
23 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
24 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
25 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
26 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
27 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
28 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
29 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
30 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
31 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
32 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
33 * SUCH DAMAGE.
34 */
35
36 #include <sys/cdefs.h>
37 #ifndef lint
38 #if 0
39 static const char rcsid[] =
40 "@(#) Header: ifaddrlist.c,v 1.2 97/04/22 13:31:05 leres Exp (LBL)";
41 "@(#) Id: ifaddrlist.c,v 1.9 2000/11/23 20:01:55 leres Exp (LBL)";
42 #else
43 __RCSID("$NetBSD: ifaddrlist.c,v 1.10 2011/09/11 01:06:26 christos Exp $");
44 #endif
45 #endif
46
47 #include <sys/param.h>
48 #include <sys/file.h>
49 #include <sys/ioctl.h>
50 #include <sys/socket.h>
51 #ifdef HAVE_SYS_SOCKIO_H
52 #include <sys/sockio.h>
53 #endif
54 #include <sys/time.h> /* concession to AIX */
55
56 struct mbuf;
57 struct rtentry;
58
59 #include <net/if.h>
60 #include <netinet/in.h>
61 #include <arpa/inet.h>
62
63 #include <ctype.h>
64 #include <errno.h>
65 #include <memory.h>
66 #include <stdio.h>
67 #include <stdlib.h>
68 #include <string.h>
69 #include <unistd.h>
70 #include <ifaddrs.h>
71
72 #include "gnuc.h"
73 #ifdef HAVE_OS_PROTO_H
74 #include "os-proto.h"
75 #endif
76
77 #include "ifaddrlist.h"
78
79 /* Not all systems have IFF_LOOPBACK */
80 #ifdef IFF_LOOPBACK
81 #define ISLOOPBACK(p) ((p)->ifa_flags & IFF_LOOPBACK)
82 #else
83 #define ISLOOPBACK(p) (strcmp((p)->ifa_name, "lo0") == 0)
84 #endif
85
86 /*
87 * Return the interface list
88 */
89 ssize_t
ifaddrlist(struct ifaddrlist ** ipaddrp,char * errbuf,size_t buflen)90 ifaddrlist(struct ifaddrlist **ipaddrp, char *errbuf, size_t buflen)
91 {
92 struct sockaddr_in *sin;
93 struct ifaddrs *ifap = NULL, *ifa;
94 struct ifaddrlist *al = NULL, *nal;
95 size_t i = 0, maxal = 10;
96
97 if (getifaddrs(&ifap) != 0)
98 goto out;
99
100 if ((al = malloc(maxal * sizeof(*al))) == NULL)
101 goto out;
102
103 for (ifa = ifap; ifa; ifa = ifa->ifa_next) {
104 if (ifa->ifa_addr->sa_family != AF_INET)
105 continue;
106
107 /* Must be up */
108 if ((ifa->ifa_flags & IFF_UP) == 0)
109 continue;
110
111 /*
112 * Must not be a loopback address (127/8)
113 */
114 sin = (struct sockaddr_in *)ifa->ifa_addr;
115 if (ISLOOPBACK(ifa))
116 if (ntohl(sin->sin_addr.s_addr) == INADDR_LOOPBACK)
117 continue;
118
119 if (i == maxal) {
120 maxal <<= 1;
121 if ((nal = realloc(al, maxal * sizeof(*al))) == NULL)
122 goto out;
123 al = nal;
124 }
125
126 al[i].addr = sin->sin_addr.s_addr;
127 if ((al[i].device = strdup(ifa->ifa_name)) == NULL)
128 goto out;
129 i++;
130 }
131 if ((nal = realloc(al, i * sizeof(*al))) == NULL)
132 goto out;
133 freeifaddrs(ifap);
134 *ipaddrp = nal;
135 return (ssize_t)i;
136 out:
137 if (ifap)
138 freeifaddrs(ifap);
139 if (al) {
140 while (i > 0)
141 free(al[--i].device);
142 free(al);
143 }
144 (void)snprintf(errbuf, buflen, "%s: %s", __func__, strerror(errno));
145 return -1;
146 }
147