The Tcpdump Group git mirrors - libpcap/blob - fad-glifc.c

   1 /* -*- Mode: c; tab-width: 8; indent-tabs-mode: 1; c-basic-offset: 8; -*- */
   2 /*
   3  * Copyright (c) 1994, 1995, 1996, 1997, 1998
   4  *      The Regents of the University of California.  All rights reserved.
   5  *
   6  * Redistribution and use in source and binary forms, with or without
   7  * modification, are permitted provided that the following conditions
   8  * are met:
   9  * 1. Redistributions of source code must retain the above copyright
  10  *    notice, this list of conditions and the following disclaimer.
  11  * 2. Redistributions in binary form must reproduce the above copyright
  12  *    notice, this list of conditions and the following disclaimer in the
  13  *    documentation and/or other materials provided with the distribution.
  14  * 3. All advertising materials mentioning features or use of this software
  15  *    must display the following acknowledgement:
  16  *      This product includes software developed by the Computer Systems
  17  *      Engineering Group at Lawrence Berkeley Laboratory.
  18  * 4. Neither the name of the University nor of the Laboratory may be used
  19  *    to endorse or promote products derived from this software without
  20  *    specific prior written permission.
  21  *
  22  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
  23  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  24  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  25  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
  26  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  27  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  28  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  29  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  30  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  31  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  32  * SUCH DAMAGE.
  33  */
  34
  35 #include <config.h>
  36
  37 #include <sys/param.h>
  38 #include <sys/file.h>
  39 #include <sys/ioctl.h>
  40 #include <sys/socket.h>
  41 #include <sys/sockio.h>
  42
  43 struct mbuf;            /* Squelch compiler warnings on some platforms for */
  44 struct rtentry;         /* declarations in <net/if.h> */
  45 #include <net/if.h>
  46 #include <netinet/in.h>
  47
  48 #include <errno.h>
  49 #include <memory.h>
  50 #include <stdio.h>
  51 #include <stdlib.h>
  52 #include <string.h>
  53 #include <unistd.h>
  54
  55 #include "pcap-int.h"
  56
  57 #ifdef HAVE_OS_PROTO_H
  58 #include "os-proto.h"
  59 #endif
  60
  61 /*
  62  * Only Solaris 10 uses this file.
  63  */
  64
  65 /*
  66  * Get a list of all interfaces that are up and that we can open.
  67  * Returns -1 on error, 0 otherwise.
  68  * The list, as returned through "alldevsp", may be null if no interfaces
  69  * were up and could be opened.
  70  *
  71  * This is the implementation used on platforms that have SIOCGLIFCONF
  72  * but don't have "getifaddrs()".  (Solaris 8 and later; we use
  73  * SIOCGLIFCONF rather than SIOCGIFCONF in order to get IPv6 addresses.)
  74  */
  75 int
  76 pcapint_findalldevs_interfaces(pcap_if_list_t *devlistp, char *errbuf,
  77     int (*check_usable)(const char *), get_if_flags_func get_flags_func)
  78 {
  79         register int fd4, fd6, fd;
  80         register struct lifreq *ifrp, *ifend;
  81         struct lifnum ifn;
  82         struct lifconf ifc;
  83         char *buf = NULL;
  84         unsigned buf_size;
  85         char *p, *q;
  86         struct lifreq ifrflags, ifrnetmask, ifrbroadaddr, ifrdstaddr;
  87         struct sockaddr *netmask, *broadaddr, *dstaddr;
  88         int ret = 0;
  89
  90         /*
  91          * Create a socket from which to fetch the list of interfaces,
  92          * and from which to fetch IPv4 information.
  93          */
  94         fd4 = socket(AF_INET, SOCK_DGRAM, 0);
  95         if (fd4 < 0) {
  96                 pcapint_fmt_errmsg_for_errno(errbuf, PCAP_ERRBUF_SIZE,
  97                     errno, "socket: AF_INET");
  98                 return (-1);
  99         }
 100
 101         /*
 102          * Create a socket from which to fetch IPv6 information.
 103          */
 104         fd6 = socket(AF_INET6, SOCK_DGRAM, 0);
 105         if (fd6 < 0) {
 106                 pcapint_fmt_errmsg_for_errno(errbuf, PCAP_ERRBUF_SIZE,
 107                     errno, "socket: AF_INET6");
 108                 (void)close(fd4);
 109                 return (-1);
 110         }
 111
 112         /*
 113          * How many entries will SIOCGLIFCONF return?
 114          */
 115         ifn.lifn_family = AF_UNSPEC;
 116         ifn.lifn_flags = 0;
 117         ifn.lifn_count = 0;
 118         if (ioctl(fd4, SIOCGLIFNUM, (char *)&ifn) < 0) {
 119                 pcapint_fmt_errmsg_for_errno(errbuf, PCAP_ERRBUF_SIZE,
 120                     errno, "SIOCGLIFNUM");
 121                 (void)close(fd6);
 122                 (void)close(fd4);
 123                 return (-1);
 124         }
 125
 126         /*
 127          * Allocate a buffer for those entries.
 128          */
 129         buf_size = ifn.lifn_count * sizeof (struct lifreq);
 130         buf = malloc(buf_size);
 131         if (buf == NULL) {
 132                 pcapint_fmt_errmsg_for_errno(errbuf, PCAP_ERRBUF_SIZE,
 133                     errno, "malloc");
 134                 (void)close(fd6);
 135                 (void)close(fd4);
 136                 return (-1);
 137         }
 138
 139         /*
 140          * Get the entries.
 141          */
 142         ifc.lifc_len = buf_size;
 143         ifc.lifc_buf = buf;
 144         ifc.lifc_family = AF_UNSPEC;
 145         ifc.lifc_flags = 0;
 146         memset(buf, 0, buf_size);
 147         if (ioctl(fd4, SIOCGLIFCONF, (char *)&ifc) < 0) {
 148                 pcapint_fmt_errmsg_for_errno(errbuf, PCAP_ERRBUF_SIZE,
 149                     errno, "SIOCGLIFCONF");
 150                 (void)close(fd6);
 151                 (void)close(fd4);
 152                 free(buf);
 153                 return (-1);
 154         }
 155
 156         /*
 157          * Loop over the entries.
 158          */
 159         ifrp = (struct lifreq *)buf;
 160         ifend = (struct lifreq *)(buf + ifc.lifc_len);
 161
 162         for (; ifrp < ifend; ifrp++) {
 163                 /*
 164                  * Skip entries that begin with "dummy".
 165                  * XXX - what are these?  Is this Linux-specific?
 166                  * Are there platforms on which we shouldn't do this?
 167                  */
 168                 if (strncmp(ifrp->lifr_name, "dummy", 5) == 0)
 169                         continue;
 170
 171                 /*
 172                  * Can we capture on this device?
 173                  */
 174                 if (!(*check_usable)(ifrp->lifr_name)) {
 175                         /*
 176                          * No.
 177                          */
 178                         continue;
 179                 }
 180
 181                 /*
 182                  * IPv6 or not?
 183                  */
 184                 if (((struct sockaddr *)&ifrp->lifr_addr)->sa_family == AF_INET6)
 185                         fd = fd6;
 186                 else
 187                         fd = fd4;
 188
 189                 /*
 190                  * Get the flags for this interface.
 191                  */
 192                 strncpy(ifrflags.lifr_name, ifrp->lifr_name,
 193                     sizeof(ifrflags.lifr_name));
 194                 if (ioctl(fd, SIOCGLIFFLAGS, (char *)&ifrflags) < 0) {
 195                         if (errno == ENXIO)
 196                                 continue;
 197                         pcapint_fmt_errmsg_for_errno(errbuf, PCAP_ERRBUF_SIZE,
 198                             errno, "SIOCGLIFFLAGS: %.*s",
 199                             (int)sizeof(ifrflags.lifr_name),
 200                             ifrflags.lifr_name);
 201                         ret = -1;
 202                         break;
 203                 }
 204
 205                 /*
 206                  * Get the netmask for this address on this interface.
 207                  */
 208                 strncpy(ifrnetmask.lifr_name, ifrp->lifr_name,
 209                     sizeof(ifrnetmask.lifr_name));
 210                 memcpy(&ifrnetmask.lifr_addr, &ifrp->lifr_addr,
 211                     sizeof(ifrnetmask.lifr_addr));
 212                 if (ioctl(fd, SIOCGLIFNETMASK, (char *)&ifrnetmask) < 0) {
 213                         if (errno == EADDRNOTAVAIL) {
 214                                 /*
 215                                  * Not available.
 216                                  */
 217                                 netmask = NULL;
 218                         } else {
 219                                 pcapint_fmt_errmsg_for_errno(errbuf,
 220                                     PCAP_ERRBUF_SIZE, errno,
 221                                     "SIOCGLIFNETMASK: %.*s",
 222                                     (int)sizeof(ifrnetmask.lifr_name),
 223                                     ifrnetmask.lifr_name);
 224                                 ret = -1;
 225                                 break;
 226                         }
 227                 } else
 228                         netmask = (struct sockaddr *)&ifrnetmask.lifr_addr;
 229
 230                 /*
 231                  * Get the broadcast address for this address on this
 232                  * interface (if any).
 233                  */
 234                 if (ifrflags.lifr_flags & IFF_BROADCAST) {
 235                         strncpy(ifrbroadaddr.lifr_name, ifrp->lifr_name,
 236                             sizeof(ifrbroadaddr.lifr_name));
 237                         memcpy(&ifrbroadaddr.lifr_addr, &ifrp->lifr_addr,
 238                             sizeof(ifrbroadaddr.lifr_addr));
 239                         if (ioctl(fd, SIOCGLIFBRDADDR,
 240                             (char *)&ifrbroadaddr) < 0) {
 241                                 if (errno == EADDRNOTAVAIL) {
 242                                         /*
 243                                          * Not available.
 244                                          */
 245                                         broadaddr = NULL;
 246                                 } else {
 247                                         pcapint_fmt_errmsg_for_errno(errbuf,
 248                                             PCAP_ERRBUF_SIZE, errno,
 249                                             "SIOCGLIFBRDADDR: %.*s",
 250                                             (int)sizeof(ifrbroadaddr.lifr_name),
 251                                             ifrbroadaddr.lifr_name);
 252                                         ret = -1;
 253                                         break;
 254                                 }
 255                         } else
 256                                 broadaddr = (struct sockaddr *)&ifrbroadaddr.lifr_broadaddr;
 257                 } else {
 258                         /*
 259                          * Not a broadcast interface, so no broadcast
 260                          * address.
 261                          */
 262                         broadaddr = NULL;
 263                 }
 264
 265                 /*
 266                  * Get the destination address for this address on this
 267                  * interface (if any).
 268                  */
 269                 if (ifrflags.lifr_flags & IFF_POINTOPOINT) {
 270                         strncpy(ifrdstaddr.lifr_name, ifrp->lifr_name,
 271                             sizeof(ifrdstaddr.lifr_name));
 272                         memcpy(&ifrdstaddr.lifr_addr, &ifrp->lifr_addr,
 273                             sizeof(ifrdstaddr.lifr_addr));
 274                         if (ioctl(fd, SIOCGLIFDSTADDR,
 275                             (char *)&ifrdstaddr) < 0) {
 276                                 if (errno == EADDRNOTAVAIL) {
 277                                         /*
 278                                          * Not available.
 279                                          */
 280                                         dstaddr = NULL;
 281                                 } else {
 282                                         pcapint_fmt_errmsg_for_errno(errbuf,
 283                                             PCAP_ERRBUF_SIZE, errno,
 284                                             "SIOCGLIFDSTADDR: %.*s",
 285                                             (int)sizeof(ifrdstaddr.lifr_name),
 286                                             ifrdstaddr.lifr_name);
 287                                         ret = -1;
 288                                         break;
 289                                 }
 290                         } else
 291                                 dstaddr = (struct sockaddr *)&ifrdstaddr.lifr_dstaddr;
 292                 } else
 293                         dstaddr = NULL;
 294
 295                 /*
 296                  * If this entry has a colon followed by a number at
 297                  * the end, it's a logical interface.  Those are just
 298                  * the way you assign multiple IP addresses to a real
 299                  * interface, so an entry for a logical interface should
 300                  * be treated like the entry for the real interface;
 301                  * we do that by stripping off the ":" and the number.
 302                  */
 303                 p = strchr(ifrp->lifr_name, ':');
 304                 if (p != NULL) {
 305                         /*
 306                          * We have a ":"; is it followed by a number?
 307                          */
 308                         q = p + 1;
 309                         while (PCAP_ISDIGIT(*q))
 310                                 q++;
 311                         if (*q == '\0') {
 312                                 /*
 313                                  * All digits after the ":" until the end.
 314                                  * Strip off the ":" and everything after
 315                                  * it.
 316                                  */
 317                                 *p = '\0';
 318                         }
 319                 }
 320
 321                 /*
 322                  * Add information for this address to the list.
 323                  */
 324                 if (pcapint_add_addr_to_if(devlistp, ifrp->lifr_name,
 325                     ifrflags.lifr_flags, get_flags_func,
 326                     (struct sockaddr *)&ifrp->lifr_addr,
 327                     sizeof (struct sockaddr_storage),
 328                     netmask, sizeof (struct sockaddr_storage),
 329                     broadaddr, sizeof (struct sockaddr_storage),
 330                     dstaddr, sizeof (struct sockaddr_storage), errbuf) < 0) {
 331                         ret = -1;
 332                         break;
 333                 }
 334         }
 335         free(buf);
 336         (void)close(fd6);
 337         (void)close(fd4);
 338
 339         return (ret);
 340 }