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fad-win32.c

/*
 * Copyright (c) 2002 - 2005 NetGroup, Politecnico di Torino (Italy)
 * Copyright (c) 2005 - 2006 CACE Technologies, Davis (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. Neither the name of the Politecnico di Torino, CACE Technologies 
 * nor the names of its contributors may be used to endorse or promote 
 * products derived from this software without specific prior written 
 * permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS 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 COPYRIGHT
 * OWNER 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-win32.c,v 1.11.2.3 2006/02/22 17:09:32 gianluca Exp $ (LBL)";
#endif

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

#include <pcap.h>
#include <pcap-int.h>
#include <Packet32.h>

#include <errno.h>
      
/*
 * Add an entry to the list of addresses for an interface.
 * "curdev" is the entry for that interface.
 */
static int
add_addr_to_list(pcap_if_t *curdev, struct sockaddr *addr,
    struct sockaddr *netmask, struct sockaddr *broadaddr,
    struct sockaddr *dstaddr, char *errbuf)
{
      pcap_addr_t *curaddr, *prevaddr, *nextaddr;

      /*
       * Allocate the new entry and fill it in.
       */
      curaddr = (pcap_addr_t*)malloc(sizeof(pcap_addr_t));
      if (curaddr == NULL) {
            (void)snprintf(errbuf, PCAP_ERRBUF_SIZE,
                "malloc: %s", pcap_strerror(errno));
            return (-1);
      }

      curaddr->next = NULL;
      if (addr != NULL) {
            curaddr->addr = (struct sockaddr*)dup_sockaddr(addr, sizeof(struct sockaddr_storage));
            if (curaddr->addr == NULL) {
                  (void)snprintf(errbuf, PCAP_ERRBUF_SIZE,
                      "malloc: %s", pcap_strerror(errno));
                  free(curaddr);
                  return (-1);
            }
      } else
            curaddr->addr = NULL;

      if (netmask != NULL) {
            curaddr->netmask = (struct sockaddr*)dup_sockaddr(netmask, sizeof(struct sockaddr_storage));
            if (curaddr->netmask == NULL) {
                  (void)snprintf(errbuf, PCAP_ERRBUF_SIZE,
                      "malloc: %s", pcap_strerror(errno));
                  free(curaddr);
                  return (-1);
            }
      } else
            curaddr->netmask = NULL;
            
      if (broadaddr != NULL) {
            curaddr->broadaddr = (struct sockaddr*)dup_sockaddr(broadaddr, sizeof(struct sockaddr_storage));
            if (curaddr->broadaddr == NULL) {
                  (void)snprintf(errbuf, PCAP_ERRBUF_SIZE,
                      "malloc: %s", pcap_strerror(errno));
                  free(curaddr);
                  return (-1);
            }
      } else
            curaddr->broadaddr = NULL;
            
      if (dstaddr != NULL) {
            curaddr->dstaddr = (struct sockaddr*)dup_sockaddr(dstaddr, sizeof(struct sockaddr_storage));
            if (curaddr->dstaddr == NULL) {
                  (void)snprintf(errbuf, PCAP_ERRBUF_SIZE,
                      "malloc: %s", pcap_strerror(errno));
                  free(curaddr);
                  return (-1);
            }
      } else
            curaddr->dstaddr = NULL;
            
      /*
       * Find the end of the list of addresses.
       */
      for (prevaddr = curdev->addresses; prevaddr != NULL; prevaddr = nextaddr) {
            nextaddr = prevaddr->next;
            if (nextaddr == NULL) {
                  /*
                   * This is the end of the list.
                   */
                  break;
            }
      }

      if (prevaddr == NULL) {
            /*
             * The list was empty; this is the first member.
             */
            curdev->addresses = curaddr;
      } else {
            /*
             * "prevaddr" is the last member of the list; append
             * this member to it.
             */
            prevaddr->next = curaddr;
      }

      return (0);
}


static int
pcap_add_if_win32(pcap_if_t **devlist, char *name, const char *desc,
    char *errbuf)
{
      pcap_if_t *curdev;
      npf_if_addr if_addrs[MAX_NETWORK_ADDRESSES];
      LONG if_addr_size;
      int res = 0;

      if_addr_size = MAX_NETWORK_ADDRESSES;

      /*
       * Add an entry for this interface, with no addresses.
       */
      if (add_or_find_if(&curdev, devlist, name, 0, desc, errbuf) == -1) {
            /*
             * Failure.
             */
            return (-1);
      }

      /*
       * Get the list of addresses for the interface.
       */
      if (!PacketGetNetInfoEx((void *)name, if_addrs, &if_addr_size)) {
            /*
             * Failure.
             *
             * We don't return an error, because this can happen with
             * NdisWan interfaces, and we want to supply them even
             * if we can't supply their addresses.
             *
             * We return an entry with an empty address list.
             */
            return (0);
      }

      /*
       * Now add the addresses.
       */
      while (if_addr_size-- > 0) {
            /*
             * "curdev" is an entry for this interface; add an entry for
             * this address to its list of addresses.
             */
            if(curdev == NULL)
                  break;
            res = add_addr_to_list(curdev,
                (struct sockaddr *)&if_addrs[if_addr_size].IPAddress,
                (struct sockaddr *)&if_addrs[if_addr_size].SubnetMask,
                (struct sockaddr *)&if_addrs[if_addr_size].Broadcast,
                NULL,
                  errbuf);
            if (res == -1) {
                  /*
                   * Failure.
                   */
                  break;
            }
      }

      return (res);
}


/*
 * 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.
 *
 * Win32 implementation, based on WinPcap
 */
int
pcap_findalldevs(pcap_if_t **alldevsp, char *errbuf)
{
      pcap_if_t *devlist = NULL;
      int ret = 0;
      const char *desc;
      char *AdaptersName;
      ULONG NameLength;
      char *name;
      
      if (!PacketGetAdapterNames(NULL, &NameLength))
      {
            DWORD last_error = GetLastError();

            if (last_error != ERROR_INSUFFICIENT_BUFFER)
            {
                  snprintf(errbuf, PCAP_ERRBUF_SIZE,
                        "PacketGetAdapterNames: %s",
                        pcap_win32strerror());
                  return (-1);
            }
      }

      if (NameLength > 0)
            AdaptersName = (char*) malloc(NameLength);
      else
      {
            *alldevsp = NULL;
            return 0;
      }
      if (AdaptersName == NULL)
      {
            snprintf(errbuf, PCAP_ERRBUF_SIZE, "Cannot allocate enough memory to list the adapters.");
            return (-1);
      }                 

      if (!PacketGetAdapterNames(AdaptersName, &NameLength)) {
            snprintf(errbuf, PCAP_ERRBUF_SIZE,
                  "PacketGetAdapterNames: %s",
                  pcap_win32strerror());
            free(AdaptersName);
            return (-1);
      }
      
      /*
       * "PacketGetAdapterNames()" returned a list of
       * null-terminated ASCII interface name strings,
       * terminated by a null string, followed by a list
       * of null-terminated ASCII interface description
       * strings, terminated by a null string.
       * This means there are two ASCII nulls at the end
       * of the first list.
       *
       * Find the end of the first list; that's the
       * beginning of the second list.
       */
      desc = &AdaptersName[0];
      while (*desc != '\0' || *(desc + 1) != '\0')
            desc++;
      
      /*
       * Found it - "desc" points to the first of the two
       * nulls at the end of the list of names, so the
       * first byte of the list of descriptions is two bytes
       * after it.
       */
      desc += 2;
      
      /*
       * Loop over the elements in the first list.
       */
      name = &AdaptersName[0];
      while (*name != '\0') {
            /*
             * Add an entry for this interface.
             */
            if (pcap_add_if_win32(&devlist, name, desc, errbuf) == -1) {
                  /*
                   * Failure.
                   */
                  ret = -1;
                  break;
            }
            name += strlen(name) + 1;
            desc += strlen(desc) + 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;
      free(AdaptersName);
      return (ret);
}

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