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ifaddrlist.c revision 1.8 
      1 /*	$NetBSD: ifaddrlist.c,v 1.8 2011/05/10 01:52:49 christos Exp $	*/
      2 
      3 /*
      4  * Copyright (c) 1997
      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 #else
     42 __RCSID("$NetBSD: ifaddrlist.c,v 1.8 2011/05/10 01:52:49 christos Exp $");
     43 #endif
     44 #endif
     45 
     46 #include <sys/param.h>
     47 #include <sys/file.h>
     48 #include <sys/ioctl.h>
     49 #include <sys/socket.h>
     50 #ifdef HAVE_SYS_SOCKIO_H
     51 #include <sys/sockio.h>
     52 #endif
     53 #include <sys/time.h>				/* concession to AIX */
     54 
     55 struct mbuf;
     56 struct rtentry;
     57 
     58 #include <net/if.h>
     59 #include <netinet/in.h>
     60 #include <arpa/inet.h>
     61 
     62 #include <ctype.h>
     63 #include <errno.h>
     64 #include <memory.h>
     65 #include <stdio.h>
     66 #include <stdlib.h>
     67 #include <string.h>
     68 #include <unistd.h>
     69 #include <ifaddrs.h>
     70 
     71 #include "gnuc.h"
     72 #ifdef HAVE_OS_PROTO_H
     73 #include "os-proto.h"
     74 #endif
     75 
     76 #include "ifaddrlist.h"
     77 
     78 /* Not all systems have IFF_LOOPBACK */
     79 #ifdef IFF_LOOPBACK
     80 #define ISLOOPBACK(p) ((p)->ifa_flags & IFF_LOOPBACK)
     81 #else
     82 #define ISLOOPBACK(p) (strcmp((p)->ifa_name, "lo0") == 0)
     83 #endif
     84 
     85 #define MAX_IPADDR 256
     86 
     87 /*
     88  * Return the interface list
     89  */
     90 int
     91 ifaddrlist(struct ifaddrlist **ipaddrp, char *errbuf, int buflen)
     92 {
     93 	int nipaddr;
     94 	struct sockaddr_in *sin;
     95 	struct ifaddrs *ifap, *ifa;
     96 	struct ifaddrlist *al;
     97 	static struct ifaddrlist xifaddrlist[MAX_IPADDR];
     98 
     99 	al = xifaddrlist;
    100 	nipaddr = 0;
    101 
    102 	if (getifaddrs(&ifap) != 0) {
    103 		(void)snprintf(errbuf, buflen, "getifaddrs: %s",
    104 		    strerror(errno));
    105 		return (-1);
    106 	}
    107 
    108 	for (ifa = ifap; ifa; ifa = ifa->ifa_next) {
    109 		if (ifa->ifa_addr->sa_family != AF_INET)
    110 			continue;
    111 
    112 		/* Must be up */
    113 		if ((ifa->ifa_flags & IFF_UP) == 0)
    114 			continue;
    115 
    116 		/*
    117 		 * Must not be a loopback address (127/8)
    118 		 */
    119 		sin = (struct sockaddr_in *)ifa->ifa_addr;
    120 		if (ISLOOPBACK(ifa))
    121 			if (ntohl(sin->sin_addr.s_addr) == INADDR_LOOPBACK)
    122 				continue;
    123 
    124 		al->addr = sin->sin_addr.s_addr;
    125 		al->device = strdup(ifa->ifa_name);
    126 		++al;
    127 		++nipaddr;
    128 	}
    129 	*ipaddrp = xifaddrlist;
    130 	freeifaddrs(ifap);
    131 	return (nipaddr);
    132 }
    133