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fad-glifc.c

/* -*- Mode: c; tab-width: 8; indent-tabs-mode: 1; c-basic-offset: 8; -*- */
/*
 * Copyright (c) 1994, 1995, 1996, 1997, 1998
 *    The Regents of the University of California.  All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer.
 * 2. Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in the
 *    documentation and/or other materials provided with the distribution.
 * 3. All advertising materials mentioning features or use of this software
 *    must display the following acknowledgement:
 *    This product includes software developed by the Computer Systems
 *    Engineering Group at Lawrence Berkeley Laboratory.
 * 4. Neither the name of the University nor of the Laboratory may be used
 *    to endorse or promote products derived from this software without
 *    specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
 * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
 * SUCH DAMAGE.
 */

#ifndef lint
static const char rcsid[] _U_ =
    "@(#) $Header: /tcpdump/master/libpcap/fad-glifc.c,v 1.5.2.1 2005/04/19 00:54:16 guy Exp $ (LBL)";
#endif

#ifdef HAVE_CONFIG_H
#include "config.h"
#endif

#include <sys/param.h>
#include <sys/file.h>
#include <sys/ioctl.h>
#include <sys/socket.h>
#ifdef HAVE_SYS_SOCKIO_H
#include <sys/sockio.h>
#endif
#include <sys/time.h>                     /* concession to AIX */

struct mbuf;            /* Squelch compiler warnings on some platforms for */
struct rtentry;         /* declarations in <net/if.h> */
#include <net/if.h>
#include <netinet/in.h>

#include <ctype.h>
#include <errno.h>
#include <memory.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>

#include "pcap-int.h"

#ifdef HAVE_OS_PROTO_H
#include "os-proto.h"
#endif

/*
 * Get a list of all interfaces that are up and that we can open.
 * Returns -1 on error, 0 otherwise.
 * The list, as returned through "alldevsp", may be null if no interfaces
 * were up and could be opened.
 *
 * This is the implementation used on platforms that have SIOCLGIFCONF
 * but don't have "getifaddrs()".  (Solaris 8 and later; we use
 * SIOCLGIFCONF rather than SIOCGIFCONF in order to get IPv6 addresses.)
 */
int
pcap_findalldevs(pcap_if_t **alldevsp, char *errbuf)
{
      pcap_if_t *devlist = NULL;
      register int fd4, fd6, fd;
      register struct lifreq *ifrp, *ifend;
      struct lifnum ifn;
      struct lifconf ifc;
      char *buf = NULL;
      unsigned buf_size;
#ifdef HAVE_SOLARIS
      char *p, *q;
#endif
      struct lifreq ifrflags, ifrnetmask, ifrbroadaddr, ifrdstaddr;
      struct sockaddr *netmask, *broadaddr, *dstaddr;
      int ret = 0;

      /*
       * Create a socket from which to fetch the list of interfaces,
       * and from which to fetch IPv4 information.
       */
      fd4 = socket(AF_INET, SOCK_DGRAM, 0);
      if (fd4 < 0) {
            (void)snprintf(errbuf, PCAP_ERRBUF_SIZE,
                "socket: %s", pcap_strerror(errno));
            return (-1);
      }

      /*
       * Create a socket from which to fetch IPv6 information.
       */
      fd6 = socket(AF_INET6, SOCK_DGRAM, 0);
      if (fd6 < 0) {
            (void)snprintf(errbuf, PCAP_ERRBUF_SIZE,
                "socket: %s", pcap_strerror(errno));
            (void)close(fd4);
            return (-1);
      }

      /*
       * How many entries will SIOCGLIFCONF return?
       */
      ifn.lifn_family = AF_UNSPEC;
      ifn.lifn_flags = 0;
      ifn.lifn_count = 0;
      if (ioctl(fd4, SIOCGLIFNUM, (char *)&ifn) < 0) {
            (void)snprintf(errbuf, PCAP_ERRBUF_SIZE,
                "SIOCGLIFNUM: %s", pcap_strerror(errno));
            (void)close(fd6);
            (void)close(fd4);
            return (-1);
      }

      /*
       * Allocate a buffer for those entries.
       */
      buf_size = ifn.lifn_count * sizeof (struct lifreq);
      buf = malloc(buf_size);
      if (buf == NULL) {
            (void)snprintf(errbuf, PCAP_ERRBUF_SIZE,
                "malloc: %s", pcap_strerror(errno));
            (void)close(fd6);
            (void)close(fd4);
            return (-1);
      }

      /*
       * Get the entries.
       */
      ifc.lifc_len = buf_size;
      ifc.lifc_buf = buf;
      ifc.lifc_family = AF_UNSPEC;
      ifc.lifc_flags = 0;
      memset(buf, 0, buf_size);
      if (ioctl(fd4, SIOCGLIFCONF, (char *)&ifc) < 0) {
            (void)snprintf(errbuf, PCAP_ERRBUF_SIZE,
                "SIOCGLIFCONF: %s", pcap_strerror(errno));
            (void)close(fd6);
            (void)close(fd4);
            free(buf);
            return (-1);
      }

      /*
       * Loop over the entries.
       */
      ifrp = (struct lifreq *)buf;
      ifend = (struct lifreq *)(buf + ifc.lifc_len);

      for (; ifrp < ifend; ifrp++) {
            /*
             * IPv6 or not?
             */
            if (((struct sockaddr *)&ifrp->lifr_addr)->sa_family == AF_INET6)
                  fd = fd6;
            else
                  fd = fd4;

            /*
             * Skip entries that begin with "dummy".
             * XXX - what are these?  Is this Linux-specific?
             * Are there platforms on which we shouldn't do this?
             */
            if (strncmp(ifrp->lifr_name, "dummy", 5) == 0)
                  continue;

#ifdef HAVE_SOLARIS
            /*
             * Skip entries that have a ":" followed by a number
             * at the end - those are Solaris virtual interfaces
             * on which you can't capture.
             */
            p = strchr(ifrp->lifr_name, ':');
            if (p != NULL) {
                  /*
                   * We have a ":"; is it followed by a number?
                   */
                  while (isdigit((unsigned char)*p))
                        p++;
                  if (*p == '\0') {
                        /*
                         * All digits after the ":" until the end.
                         */
                        continue;
                  }
            }
#endif

            /*
             * Get the flags for this interface, and skip it if it's
             * not up.
             */
            strncpy(ifrflags.lifr_name, ifrp->lifr_name,
                sizeof(ifrflags.lifr_name));
            if (ioctl(fd, SIOCGLIFFLAGS, (char *)&ifrflags) < 0) {
                  if (errno == ENXIO)
                        continue;
                  (void)snprintf(errbuf, PCAP_ERRBUF_SIZE,
                      "SIOCGLIFFLAGS: %.*s: %s",
                      (int)sizeof(ifrflags.lifr_name),
                      ifrflags.lifr_name,
                      pcap_strerror(errno));
                  ret = -1;
                  break;
            }
            if (!(ifrflags.lifr_flags & IFF_UP))
                  continue;

            /*
             * Get the netmask for this address on this interface.
             */
            strncpy(ifrnetmask.lifr_name, ifrp->lifr_name,
                sizeof(ifrnetmask.lifr_name));
            memcpy(&ifrnetmask.lifr_addr, &ifrp->lifr_addr,
                sizeof(ifrnetmask.lifr_addr));
            if (ioctl(fd, SIOCGLIFNETMASK, (char *)&ifrnetmask) < 0) {
                  if (errno == EADDRNOTAVAIL) {
                        /*
                         * Not available.
                         */
                        netmask = NULL;
                  } else {
                        (void)snprintf(errbuf, PCAP_ERRBUF_SIZE,
                            "SIOCGLIFNETMASK: %.*s: %s",
                            (int)sizeof(ifrnetmask.lifr_name),
                            ifrnetmask.lifr_name,
                            pcap_strerror(errno));
                        ret = -1;
                        break;
                  }
            } else
                  netmask = (struct sockaddr *)&ifrnetmask.lifr_addr;

            /*
             * Get the broadcast address for this address on this
             * interface (if any).
             */
            if (ifrflags.lifr_flags & IFF_BROADCAST) {
                  strncpy(ifrbroadaddr.lifr_name, ifrp->lifr_name,
                      sizeof(ifrbroadaddr.lifr_name));
                  memcpy(&ifrbroadaddr.lifr_addr, &ifrp->lifr_addr,
                      sizeof(ifrbroadaddr.lifr_addr));
                  if (ioctl(fd, SIOCGLIFBRDADDR,
                      (char *)&ifrbroadaddr) < 0) {
                        if (errno == EADDRNOTAVAIL) {
                              /*
                               * Not available.
                               */
                              broadaddr = NULL;
                        } else {
                              (void)snprintf(errbuf, PCAP_ERRBUF_SIZE,
                                  "SIOCGLIFBRDADDR: %.*s: %s",
                                  (int)sizeof(ifrbroadaddr.lifr_name),
                                  ifrbroadaddr.lifr_name,
                                  pcap_strerror(errno));
                              ret = -1;
                              break;
                        }
                  } else
                        broadaddr = (struct sockaddr *)&ifrbroadaddr.lifr_broadaddr;
            } else {
                  /*
                   * Not a broadcast interface, so no broadcast
                   * address.
                   */
                  broadaddr = NULL;
            }

            /*
             * Get the destination address for this address on this
             * interface (if any).
             */
            if (ifrflags.lifr_flags & IFF_POINTOPOINT) {
                  strncpy(ifrdstaddr.lifr_name, ifrp->lifr_name,
                      sizeof(ifrdstaddr.lifr_name));
                  memcpy(&ifrdstaddr.lifr_addr, &ifrp->lifr_addr,
                      sizeof(ifrdstaddr.lifr_addr));
                  if (ioctl(fd, SIOCGLIFDSTADDR,
                      (char *)&ifrdstaddr) < 0) {
                        if (errno == EADDRNOTAVAIL) {
                              /*
                               * Not available.
                               */
                              dstaddr = NULL;
                        } else {
                              (void)snprintf(errbuf, PCAP_ERRBUF_SIZE,
                                  "SIOCGLIFDSTADDR: %.*s: %s",
                                  (int)sizeof(ifrdstaddr.lifr_name),
                                  ifrdstaddr.lifr_name,
                                  pcap_strerror(errno));
                              ret = -1;
                              break;
                        }
                  } else
                        dstaddr = (struct sockaddr *)&ifrdstaddr.lifr_dstaddr;
            } else
                  dstaddr = NULL;

#ifdef HAVE_SOLARIS
            /*
             * If this entry has a colon followed by a number at
             * the end, it's a logical interface.  Those are just
             * the way you assign multiple IP addresses to a real
             * interface, so an entry for a logical interface should
             * be treated like the entry for the real interface;
             * we do that by stripping off the ":" and the number.
             */
            p = strchr(ifrp->lifr_name, ':');
            if (p != NULL) {
                  /*
                   * We have a ":"; is it followed by a number?
                   */
                  q = p + 1;
                  while (isdigit((unsigned char)*q))
                        q++;
                  if (*q == '\0') {
                        /*
                         * All digits after the ":" until the end.
                         * Strip off the ":" and everything after
                         * it.
                         */
                        *p = '\0';
                  }
            }
#endif

            /*
             * Add information for this address to the list.
             */
            if (add_addr_to_iflist(&devlist, ifrp->lifr_name,
                ifrflags.lifr_flags, (struct sockaddr *)&ifrp->lifr_addr,
                sizeof (struct sockaddr_storage),
                netmask, sizeof (struct sockaddr_storage),
                broadaddr, sizeof (struct sockaddr_storage),
                dstaddr, sizeof (struct sockaddr_storage), errbuf) < 0) {
                  ret = -1;
                  break;
            }
      }
      free(buf);
      (void)close(fd6);
      (void)close(fd4);

      if (ret != -1) {
            /*
             * We haven't had any errors yet; do any platform-specific
             * operations to add devices.
             */
            if (pcap_platform_finddevs(&devlist, errbuf) < 0)
                  ret = -1;
      }

      if (ret == -1) {
            /*
             * We had an error; free the list we've been constructing.
             */
            if (devlist != NULL) {
                  pcap_freealldevs(devlist);
                  devlist = NULL;
            }
      }

      *alldevsp = devlist;
      return (ret);
}

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