usr.sbin/traceroute/ifaddrlist.c

   1 /*      $NetBSD: ifaddrlist.c,v 1.6 2003/05/15 14:34:39 itojun 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 1.6 2003/05/15 14:34:39 itojun 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 ifaddrlist[MAX_IPADDR];
  98
  99         al = ifaddrlist;
 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 = ifaddrlist;
 130         freeifaddrs(ifap);
 131         return (nipaddr);
 132 }