traceroute.tproj/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 1.3 2006/02/07 06:22:57 lindak Exp $ (LBL)";
  37 #endif
  38
  39 #include <sys/param.h>
  40 #include <sys/file.h>
  41 #include <sys/ioctl.h>
  42 #include <sys/socket.h>
  43 #ifdef HAVE_SYS_SOCKIO_H
  44 #include <sys/sockio.h>
  45 #endif
  46 #include <sys/time.h>                           /* concession to AIX */
  47
  48 #if __STDC__
  49 struct mbuf;
  50 struct rtentry;
  51 #endif
  52
  53 #include <net/if.h>
  54 #include <netinet/in.h>
  55
  56 #include <ctype.h>
  57 #include <errno.h>
  58 #include <memory.h>
  59 #include <stdio.h>
  60 #include <stdlib.h>
  61 #include <string.h>
  62 #include <unistd.h>
  63
  64 #include "gnuc.h"
  65 #ifdef HAVE_OS_PROTO_H
  66 #include "os-proto.h"
  67 #endif
  68
  69 #include "ifaddrlist.h"
  70
  71 /*
  72  * Return the interface list
  73  */
  74 int
  75 ifaddrlist(register struct ifaddrlist **ipaddrp, register char *errbuf)
  76 {
  77         register int fd, nipaddr;
  78 #ifdef HAVE_SOCKADDR_SA_LEN
  79         register int n;
  80 #endif
  81         register struct ifreq *ifrp, *ifend, *ifnext, *mp;
  82         register struct sockaddr_in *sin;
  83         register struct ifaddrlist *al;
  84         struct ifconf ifc;
  85         struct ifreq ibuf[(32 * 1024) / sizeof(struct ifreq)], ifr;
  86 #define MAX_IPADDR (sizeof(ibuf) / sizeof(ibuf[0]))
  87         static struct ifaddrlist ifaddrlist[MAX_IPADDR];
  88         char device[sizeof(ifr.ifr_name) + 1];
  89
  90         fd = socket(AF_INET, SOCK_DGRAM, 0);
  91         if (fd < 0) {
  92                 (void)sprintf(errbuf, "socket: %s", strerror(errno));
  93                 return (-1);
  94         }
  95         ifc.ifc_len = sizeof(ibuf);
  96         ifc.ifc_buf = (caddr_t)ibuf;
  97
  98         if (ioctl(fd, SIOCGIFCONF, (char *)&ifc) < 0 ||
  99             ifc.ifc_len < sizeof(struct ifreq)) {
 100                 if (errno == EINVAL)
 101                         (void)sprintf(errbuf,
 102                             "SIOCGIFCONF: ifreq struct too small (%d bytes)",
 103                             (int)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 = ifrp->ifr_addr.sa_len + sizeof(ifrp->ifr_name);
 119                 if (n < sizeof(*ifrp))
 120                         ifnext = ifrp + 1;
 121                 else
 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) < 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
 150                 (void)strncpy(device, ifr.ifr_name, sizeof(ifr.ifr_name));
 151                 device[sizeof(device) - 1] = '\0';
 152 #ifdef sun
 153                 /* Ignore sun virtual interfaces */
 154                 if (strchr(device, ':') != NULL)
 155                         continue;
 156 #endif
 157                 if (ioctl(fd, SIOCGIFADDR, (char *)&ifr) < 0) {
 158                         (void)sprintf(errbuf, "SIOCGIFADDR: %s: %s",
 159                             device, strerror(errno));
 160                         (void)close(fd);
 161                         return (-1);
 162                 }
 163
 164                 if (nipaddr >= MAX_IPADDR) {
 165                         (void)sprintf(errbuf, "Too many interfaces (%d)",
 166                             (int)MAX_IPADDR);
 167                         (void)close(fd);
 168                         return (-1);
 169                 }
 170                 sin = (struct sockaddr_in *)&ifr.ifr_addr;
 171                 al->addr = sin->sin_addr.s_addr;
 172                 al->device = strdup(device);
 173                 ++al;
 174                 ++nipaddr;
 175         }
 176         (void)close(fd);
 177
 178         *ipaddrp = ifaddrlist;
 179         return (nipaddr);
 180 }