src/bin/network/traceroute/ifaddrlist.c

   1 /*
   2  * Copyright (c) 1997, 1998, 1999, 2000
   3  *      The Regents of the University of California.  All rights reserved.
   4  *
   5  * Redistribution and use in source and binary forms, with or without
   6  * modification, are permitted provided that the following conditions
   7  * are met:
   8  * 1. Redistributions of source code must retain the above copyright
   9  *    notice, this list of conditions and the following disclaimer.
  10  * 2. Redistributions in binary form must reproduce the above copyright
  11  *    notice, this list of conditions and the following disclaimer in the
  12  *    documentation and/or other materials provided with the distribution.
  13  * 3. All advertising materials mentioning features or use of this software
  14  *    must display the following acknowledgement:
  15  *      This product includes software developed by the Computer Systems
  16  *      Engineering Group at Lawrence Berkeley Laboratory.
  17  * 4. Neither the name of the University nor of the Laboratory may be used
  18  *    to endorse or promote products derived from this software without
  19  *    specific prior written permission.
  20  *
  21  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
  22  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  23  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  24  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
  25  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  26  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  27  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  28  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  29  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  30  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  31  * SUCH DAMAGE.
  32  */
  33
  34 #ifndef lint
  35 static const char rcsid[] =
  36     "@(#) $Id: ifaddrlist.c,v 1.9 2000/11/23 20:01:55 leres Exp $ (LBL)";
  37 #endif
  38
  39 #include <sys/param.h>
  40 #include <sys/ioctl.h>
  41 #include <sys/socket.h>
  42 #ifdef HAVE_SYS_SOCKIO_H
  43 #include <sys/sockio.h>
  44 #endif
  45 #include <sys/time.h>                           /* concession to AIX */
  46
  47 #include <sys/sockio.h> /* for SIOCGIFCONF */
  48
  49 #if __STDC__
  50 struct mbuf;
  51 struct rtentry;
  52 #endif
  53
  54 #include <net/if.h>
  55 #include <netinet/in.h>
  56
  57 #include <ctype.h>
  58 #include <errno.h>
  59 #include <memory.h>
  60 #include <stdio.h>
  61 #include <stdlib.h>
  62 #include <string.h>
  63 #include <unistd.h>
  64
  65 #include "gnuc.h"
  66 #ifdef HAVE_OS_PROTO_H
  67 #include "os-proto.h"
  68 #endif
  69
  70 #include "ifaddrlist.h"
  71
  72 /*
  73  * Return the interface list
  74  */
  75 int
  76 ifaddrlist(register struct ifaddrlist **ipaddrp, register char *errbuf)
  77 {
  78         register int fd, nipaddr;
  79 #ifdef HAVE_SOCKADDR_SA_LEN
  80         register int n;
  81 #endif
  82         register struct ifreq *ifrp, *ifend, *ifnext, *mp;
  83         register struct sockaddr_in *sin;
  84         register struct ifaddrlist *al;
  85         struct ifconf ifc;
  86         struct ifreq ibuf[(32 * 1024) / sizeof(struct ifreq)], ifr;
  87 #define MAX_IPADDR (sizeof(ibuf) / sizeof(ibuf[0]))
  88         static struct ifaddrlist ifaddrlist[MAX_IPADDR];
  89         char device[sizeof(ifr.ifr_name) + 1];
  90
  91         fd = socket(AF_INET, SOCK_DGRAM, 0);
  92         if (fd < 0) {
  93                 (void)sprintf(errbuf, "socket: %s", strerror(errno));
  94                 return (-1);
  95         }
  96         ifc.ifc_len = sizeof(ibuf);
  97         ifc.ifc_buf = (caddr_t)ibuf;
  98
  99         if (ioctl(fd, SIOCGIFCONF, (char *)&ifc) < 0) {
 100                 if (errno == EINVAL)
 101                         (void)sprintf(errbuf,
 102                             "SIOCGIFCONF: ifreq struct too small (%d bytes)",
 103                             sizeof(ibuf));
 104                 else
 105                         (void)sprintf(errbuf, "SIOCGIFCONF: %s",
 106                             strerror(errno));
 107                 (void)close(fd);
 108                 return (-1);
 109         }
 110         ifrp = ibuf;
 111         ifend = (struct ifreq *)((char *)ibuf + ifc.ifc_len);
 112
 113         al = ifaddrlist;
 114         mp = NULL;
 115         nipaddr = 0;
 116         for (; ifrp < ifend; ifrp = ifnext) {
 117 #ifdef HAVE_SOCKADDR_SA_LEN
 118                 n = _SIZEOF_ADDR_IFREQ(*ifrp);
 119                 /*
 120                  * our ifreqs from SIOCGIFCONF dumps are very packed
 121                 */
 122                 ifnext = (struct ifreq *)((char *)ifrp + n);
 123                 if (ifrp->ifr_addr.sa_family != AF_INET)
 124                         continue;
 125 #else
 126                 ifnext = ifrp + 1;
 127 #endif
 128                 /*
 129                  * Need a template to preserve address info that is
 130                  * used below to locate the next entry.  (Otherwise,
 131                  * SIOCGIFFLAGS stomps over it because the requests
 132                  * are returned in a union.)
 133                  */
 134                 strncpy(ifr.ifr_name, ifrp->ifr_name, sizeof(ifr.ifr_name));
 135                 if (ioctl(fd, SIOCGIFFLAGS, (char *)&ifr, sizeof(ifr)) < 0) {
 136                         if (errno == ENXIO)
 137                                 continue;
 138                         (void)sprintf(errbuf, "SIOCGIFFLAGS: %.*s: %s",
 139                             (int)sizeof(ifr.ifr_name), ifr.ifr_name,
 140                             strerror(errno));
 141                         (void)close(fd);
 142                         return (-1);
 143                 }
 144
 145                 /* Must be up */
 146                 if ((ifr.ifr_flags & IFF_UP) == 0)
 147                         continue;
 148
 149                 /* don't use loopback */
 150                 if ((ifr.ifr_flags & IFF_LOOPBACK) != 0)
 151                         continue;
 152
 153                 (void)strncpy(device, ifr.ifr_name, sizeof(ifr.ifr_name));
 154                 device[sizeof(device) - 1] = '\0';
 155 #ifdef sun
 156                 /* Ignore sun virtual interfaces */
 157                 if (strchr(device, ':') != NULL)
 158                         continue;
 159 #endif
 160                 if (ioctl(fd, SIOCGIFADDR, (char *)&ifr, sizeof(ifr)) < 0) {
 161                         (void)sprintf(errbuf, "SIOCGIFADDR: %s: %s",
 162                             device, strerror(errno));
 163                         (void)close(fd);
 164                         return (-1);
 165                 }
 166
 167                 if (nipaddr >= MAX_IPADDR) {
 168                         (void)sprintf(errbuf, "Too many interfaces (%d)",
 169                             MAX_IPADDR);
 170                         (void)close(fd);
 171                         return (-1);
 172                 }
 173                 sin = (struct sockaddr_in *)&ifr.ifr_addr;
 174                 al->addr = sin->sin_addr.s_addr;
 175                 al->device = strdup(device);
 176                 ++al;
 177                 ++nipaddr;
 178         }
 179         (void)close(fd);
 180
 181         *ipaddrp = ifaddrlist;
 182         return (nipaddr);
 183 }