external/bsd/libpcap/dist/fad-win32.c

   1 /*      $NetBSD: fad-win32.c,v 1.3 2015/03/31 21:39:42 christos Exp $   */
   2
   3 /*
   4  * Copyright (c) 2002 - 2005 NetGroup, Politecnico di Torino (Italy)
   5  * Copyright (c) 2005 - 2006 CACE Technologies, Davis (California)
   6  * All rights reserved.
   7  *
   8  * Redistribution and use in source and binary forms, with or without
   9  * modification, are permitted provided that the following conditions
  10  * are met:
  11  *
  12  * 1. Redistributions of source code must retain the above copyright
  13  * notice, this list of conditions and the following disclaimer.
  14  * 2. Redistributions in binary form must reproduce the above copyright
  15  * notice, this list of conditions and the following disclaimer in the
  16  * documentation and/or other materials provided with the distribution.
  17  * 3. Neither the name of the Politecnico di Torino, CACE Technologies
  18  * nor the names of its contributors may be used to endorse or promote
  19  * products derived from this software without specific prior written
  20  * permission.
  21  *
  22  * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
  23  * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
  24  * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
  25  * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
  26  * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
  27  * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
  28  * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
  29  * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
  30  * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
  31  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
  32  * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  33  *
  34  */
  35
  36 #include <sys/cdefs.h>
  37 __RCSID("$NetBSD: fad-win32.c,v 1.3 2015/03/31 21:39:42 christos Exp $");
  38
  39 #ifdef HAVE_CONFIG_H
  40 #include "config.h"
  41 #endif
  42
  43 #include <pcap.h>
  44 #include <pcap-int.h>
  45 #include <Packet32.h>
  46
  47 #include <errno.h>
  48
  49 static int
  50 pcap_add_if_win32(pcap_if_t **devlist, char *name, const char *desc,
  51     char *errbuf)
  52 {
  53         pcap_if_t *curdev;
  54         npf_if_addr if_addrs[MAX_NETWORK_ADDRESSES];
  55         LONG if_addr_size;
  56         int res = 0;
  57
  58         if_addr_size = MAX_NETWORK_ADDRESSES;
  59
  60         /*
  61          * Add an entry for this interface, with no addresses.
  62          */
  63         if (add_or_find_if(&curdev, devlist, name, 0, desc, errbuf) == -1) {
  64                 /*
  65                  * Failure.
  66                  */
  67                 return (-1);
  68         }
  69
  70         /*
  71          * Get the list of addresses for the interface.
  72          */
  73         if (!PacketGetNetInfoEx((void *)name, if_addrs, &if_addr_size)) {
  74                 /*
  75                  * Failure.
  76                  *
  77                  * We don't return an error, because this can happen with
  78                  * NdisWan interfaces, and we want to supply them even
  79                  * if we can't supply their addresses.
  80                  *
  81                  * We return an entry with an empty address list.
  82                  */
  83                 return (0);
  84         }
  85
  86         /*
  87          * Now add the addresses.
  88          */
  89         while (if_addr_size-- > 0) {
  90                 /*
  91                  * "curdev" is an entry for this interface; add an entry for
  92                  * this address to its list of addresses.
  93                  */
  94                 if(curdev == NULL)
  95                         break;
  96                 res = add_addr_to_dev(curdev,
  97                     (struct sockaddr *)&if_addrs[if_addr_size].IPAddress,
  98                     sizeof (struct sockaddr_storage),
  99                     (struct sockaddr *)&if_addrs[if_addr_size].SubnetMask,
 100                     sizeof (struct sockaddr_storage),
 101                     (struct sockaddr *)&if_addrs[if_addr_size].Broadcast,
 102                     sizeof (struct sockaddr_storage),
 103                     NULL,
 104                     0,
 105                     errbuf);
 106                 if (res == -1) {
 107                         /*
 108                          * Failure.
 109                          */
 110                         break;
 111                 }
 112         }
 113
 114         return (res);
 115 }
 116
 117
 118 /*
 119  * Get a list of all interfaces that are up and that we can open.
 120  * Returns -1 on error, 0 otherwise.
 121  * The list, as returned through "alldevsp", may be null if no interfaces
 122  * were up and could be opened.
 123  *
 124  * Win32 implementation, based on WinPcap
 125  */
 126 int
 127 pcap_findalldevs_interfaces(pcap_if_t **alldevsp, char *errbuf)
 128 {
 129         pcap_if_t *devlist = NULL;
 130         int ret = 0;
 131         const char *desc;
 132         char *AdaptersName;
 133         ULONG NameLength;
 134         char *name;
 135
 136         /*
 137          * Find out how big a buffer we need.
 138          *
 139          * This call should always return FALSE; if the error is
 140          * ERROR_INSUFFICIENT_BUFFER, NameLength will be set to
 141          * the size of the buffer we need, otherwise there's a
 142          * problem, and NameLength should be set to 0.
 143          *
 144          * It shouldn't require NameLength to be set, but,
 145          * at least as of WinPcap 4.1.3, it checks whether
 146          * NameLength is big enough before it checks for a
 147          * NULL buffer argument, so, while it'll still do
 148          * the right thing if NameLength is uninitialized and
 149          * whatever junk happens to be there is big enough
 150          * (because the pointer argument will be null), it's
 151          * still reading an uninitialized variable.
 152          */
 153         NameLength = 0;
 154         if (!PacketGetAdapterNames(NULL, &NameLength))
 155         {
 156                 DWORD last_error = GetLastError();
 157
 158                 if (last_error != ERROR_INSUFFICIENT_BUFFER)
 159                 {
 160                         snprintf(errbuf, PCAP_ERRBUF_SIZE,
 161                                 "PacketGetAdapterNames: %s",
 162                                 pcap_win32strerror());
 163                         return (-1);
 164                 }
 165         }
 166
 167         if (NameLength > 0)
 168                 AdaptersName = (char*) malloc(NameLength);
 169         else
 170         {
 171                 *alldevsp = NULL;
 172                 return 0;
 173         }
 174         if (AdaptersName == NULL)
 175         {
 176                 snprintf(errbuf, PCAP_ERRBUF_SIZE, "Cannot allocate enough memory to list the adapters.");
 177                 return (-1);
 178         }
 179
 180         if (!PacketGetAdapterNames(AdaptersName, &NameLength)) {
 181                 snprintf(errbuf, PCAP_ERRBUF_SIZE,
 182                         "PacketGetAdapterNames: %s",
 183                         pcap_win32strerror());
 184                 free(AdaptersName);
 185                 return (-1);
 186         }
 187
 188         /*
 189          * "PacketGetAdapterNames()" returned a list of
 190          * null-terminated ASCII interface name strings,
 191          * terminated by a null string, followed by a list
 192          * of null-terminated ASCII interface description
 193          * strings, terminated by a null string.
 194          * This means there are two ASCII nulls at the end
 195          * of the first list.
 196          *
 197          * Find the end of the first list; that's the
 198          * beginning of the second list.
 199          */
 200         desc = &AdaptersName[0];
 201         while (*desc != '\0' || *(desc + 1) != '\0')
 202                 desc++;
 203
 204         /*
 205          * Found it - "desc" points to the first of the two
 206          * nulls at the end of the list of names, so the
 207          * first byte of the list of descriptions is two bytes
 208          * after it.
 209          */
 210         desc += 2;
 211
 212         /*
 213          * Loop over the elements in the first list.
 214          */
 215         name = &AdaptersName[0];
 216         while (*name != '\0') {
 217                 /*
 218                  * Add an entry for this interface.
 219                  */
 220                 if (pcap_add_if_win32(&devlist, name, desc, errbuf) == -1) {
 221                         /*
 222                          * Failure.
 223                          */
 224                         ret = -1;
 225                         break;
 226                 }
 227                 name += strlen(name) + 1;
 228                 desc += strlen(desc) + 1;
 229         }
 230
 231         if (ret != -1) {
 232                 /*
 233                  * We haven't had any errors yet; do any platform-specific
 234                  * operations to add devices.
 235                  */
 236                 if (pcap_platform_finddevs(&devlist, errbuf) < 0)
 237                         ret = -1;
 238         }
 239
 240         if (ret == -1) {
 241                 /*
 242                  * We had an error; free the list we've been constructing.
 243                  */
 244                 if (devlist != NULL) {
 245                         pcap_freealldevs(devlist);
 246                         devlist = NULL;
 247                 }
 248         }
 249
 250         *alldevsp = devlist;
 251         free(AdaptersName);
 252         return (ret);
 253 }