The Tcpdump Group git mirrors - libpcap/blob - fad-win32.c

   1 /*
   2  * Copyright (c) 2002 - 2003
   3  * NetGroup, Politecnico di Torino (Italy)
   4  * 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  *
  10  * 1. Redistributions of source code must retain the above copyright
  11  * notice, this list of conditions and the following disclaimer.
  12  * 2. Redistributions in binary form must reproduce the above copyright
  13  * notice, this list of conditions and the following disclaimer in the
  14  * documentation and/or other materials provided with the distribution.
  15  * 3. Neither the name of the Politecnico di Torino nor the names of its
  16  * contributors may be used to endorse or promote products derived from
  17  * this software without specific prior written permission.
  18  *
  19  * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
  20  * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
  21  * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
  22  * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
  23  * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
  24  * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
  25  * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
  26  * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
  27  * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
  28  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
  29  * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  30  *
  31  */
  32
  33 #ifndef lint
  34 static const char rcsid[] _U_ =
  35     "@(#) $Header: /tcpdump/master/libpcap/fad-win32.c,v 1.11 2005-01-29 00:52:22 guy Exp $ (LBL)";
  36 #endif
  37
  38 #ifdef HAVE_CONFIG_H
  39 #include "config.h"
  40 #endif
  41
  42 #include <pcap.h>
  43 #include <pcap-int.h>
  44 #include <packet32.h>
  45
  46 #include <errno.h>
  47
  48 /*
  49  * Add an entry to the list of addresses for an interface.
  50  * "curdev" is the entry for that interface.
  51  */
  52 static int
  53 add_addr_to_list(pcap_if_t *curdev, struct sockaddr *addr,
  54     struct sockaddr *netmask, struct sockaddr *broadaddr,
  55     struct sockaddr *dstaddr, char *errbuf)
  56 {
  57         pcap_addr_t *curaddr, *prevaddr, *nextaddr;
  58
  59         /*
  60          * Allocate the new entry and fill it in.
  61          */
  62         curaddr = (pcap_addr_t*)malloc(sizeof(pcap_addr_t));
  63         if (curaddr == NULL) {
  64                 (void)snprintf(errbuf, PCAP_ERRBUF_SIZE,
  65                     "malloc: %s", pcap_strerror(errno));
  66                 return (-1);
  67         }
  68
  69         curaddr->next = NULL;
  70         if (addr != NULL) {
  71                 curaddr->addr = (struct sockaddr*)dup_sockaddr(addr, sizeof(struct sockaddr_storage));
  72                 if (curaddr->addr == NULL) {
  73                         (void)snprintf(errbuf, PCAP_ERRBUF_SIZE,
  74                             "malloc: %s", pcap_strerror(errno));
  75                         free(curaddr);
  76                         return (-1);
  77                 }
  78         } else
  79                 curaddr->addr = NULL;
  80
  81         if (netmask != NULL) {
  82                 curaddr->netmask = (struct sockaddr*)dup_sockaddr(netmask, sizeof(struct sockaddr_storage));
  83                 if (curaddr->netmask == NULL) {
  84                         (void)snprintf(errbuf, PCAP_ERRBUF_SIZE,
  85                             "malloc: %s", pcap_strerror(errno));
  86                         free(curaddr);
  87                         return (-1);
  88                 }
  89         } else
  90                 curaddr->netmask = NULL;
  91
  92         if (broadaddr != NULL) {
  93                 curaddr->broadaddr = (struct sockaddr*)dup_sockaddr(broadaddr, sizeof(struct sockaddr_storage));
  94                 if (curaddr->broadaddr == NULL) {
  95                         (void)snprintf(errbuf, PCAP_ERRBUF_SIZE,
  96                             "malloc: %s", pcap_strerror(errno));
  97                         free(curaddr);
  98                         return (-1);
  99                 }
 100         } else
 101                 curaddr->broadaddr = NULL;
 102
 103         if (dstaddr != NULL) {
 104                 curaddr->dstaddr = (struct sockaddr*)dup_sockaddr(dstaddr, sizeof(struct sockaddr_storage));
 105                 if (curaddr->dstaddr == NULL) {
 106                         (void)snprintf(errbuf, PCAP_ERRBUF_SIZE,
 107                             "malloc: %s", pcap_strerror(errno));
 108                         free(curaddr);
 109                         return (-1);
 110                 }
 111         } else
 112                 curaddr->dstaddr = NULL;
 113
 114         /*
 115          * Find the end of the list of addresses.
 116          */
 117         for (prevaddr = curdev->addresses; prevaddr != NULL; prevaddr = nextaddr) {
 118                 nextaddr = prevaddr->next;
 119                 if (nextaddr == NULL) {
 120                         /*
 121                          * This is the end of the list.
 122                          */
 123                         break;
 124                 }
 125         }
 126
 127         if (prevaddr == NULL) {
 128                 /*
 129                  * The list was empty; this is the first member.
 130                  */
 131                 curdev->addresses = curaddr;
 132         } else {
 133                 /*
 134                  * "prevaddr" is the last member of the list; append
 135                  * this member to it.
 136                  */
 137                 prevaddr->next = curaddr;
 138         }
 139
 140         return (0);
 141 }
 142
 143
 144 static int
 145 pcap_add_if_win32(pcap_if_t **devlist, char *name, const char *desc,
 146     char *errbuf)
 147 {
 148         pcap_if_t *curdev;
 149         npf_if_addr if_addrs[MAX_NETWORK_ADDRESSES];
 150         LONG if_addr_size;
 151         int res = 0;
 152
 153         if_addr_size = MAX_NETWORK_ADDRESSES;
 154
 155         /*
 156          * Add an entry for this interface, with no addresses.
 157          */
 158         if (add_or_find_if(&curdev, devlist, name, 0, desc, errbuf) == -1) {
 159                 /*
 160                  * Failure.
 161                  */
 162                 return (-1);
 163         }
 164
 165         /*
 166          * Get the list of addresses for the interface.
 167          */
 168         if (!PacketGetNetInfoEx((void *)name, if_addrs, &if_addr_size)) {
 169                 /*
 170                  * Failure.
 171                  *
 172                  * We don't return an error, because this can happen with
 173                  * NdisWan interfaces, and we want to supply them even
 174                  * if we can't supply their addresses.
 175                  *
 176                  * We return an entry with an empty address list.
 177                  */
 178                 return (0);
 179         }
 180
 181         /*
 182          * Now add the addresses.
 183          */
 184         while (if_addr_size-- > 0) {
 185                 /*
 186                  * "curdev" is an entry for this interface; add an entry for
 187                  * this address to its list of addresses.
 188                  */
 189                 if(curdev == NULL)
 190                         break;
 191                 res = add_addr_to_list(curdev,
 192                     (struct sockaddr *)&if_addrs[if_addr_size].IPAddress,
 193                     (struct sockaddr *)&if_addrs[if_addr_size].SubnetMask,
 194                     (struct sockaddr *)&if_addrs[if_addr_size].Broadcast,
 195                     NULL,
 196                         errbuf);
 197                 if (res == -1) {
 198                         /*
 199                          * Failure.
 200                          */
 201                         break;
 202                 }
 203         }
 204
 205         return (res);
 206 }
 207
 208
 209 /*
 210  * Get a list of all interfaces that are up and that we can open.
 211  * Returns -1 on error, 0 otherwise.
 212  * The list, as returned through "alldevsp", may be null if no interfaces
 213  * were up and could be opened.
 214  *
 215  * Win32 implementation, based on WinPcap
 216  */
 217 int
 218 pcap_findalldevs(pcap_if_t **alldevsp, char *errbuf)
 219 {
 220         pcap_if_t *devlist = NULL;
 221         int ret = 0;
 222         const char *desc;
 223         char *AdaptersName;
 224         ULONG NameLength;
 225         char *name;
 226
 227         PacketGetAdapterNames(NULL, &NameLength);
 228
 229         if (NameLength > 0)
 230                 AdaptersName = (char*) malloc(NameLength);
 231         else
 232         {
 233                 *alldevsp = NULL;
 234                 return 0;
 235         }
 236         if (AdaptersName == NULL)
 237         {
 238                 snprintf(errbuf, PCAP_ERRBUF_SIZE, "Cannot allocate enough memory to list the adapters.");
 239                 return (-1);
 240         }
 241
 242         if (!PacketGetAdapterNames(AdaptersName, &NameLength)) {
 243                 snprintf(errbuf, PCAP_ERRBUF_SIZE,
 244                         "PacketGetAdapterNames: %s",
 245                         pcap_win32strerror());
 246                 free(AdaptersName);
 247                 return (-1);
 248         }
 249
 250         /*
 251          * "PacketGetAdapterNames()" returned a list of
 252          * null-terminated ASCII interface name strings,
 253          * terminated by a null string, followed by a list
 254          * of null-terminated ASCII interface description
 255          * strings, terminated by a null string.
 256          * This means there are two ASCII nulls at the end
 257          * of the first list.
 258          *
 259          * Find the end of the first list; that's the
 260          * beginning of the second list.
 261          */
 262         desc = &AdaptersName[0];
 263         while (*desc != '\0' || *(desc + 1) != '\0')
 264                 desc++;
 265
 266         /*
 267          * Found it - "desc" points to the first of the two
 268          * nulls at the end of the list of names, so the
 269          * first byte of the list of descriptions is two bytes
 270          * after it.
 271          */
 272         desc += 2;
 273
 274         /*
 275          * Loop over the elements in the first list.
 276          */
 277         name = &AdaptersName[0];
 278         while (*name != '\0') {
 279                 /*
 280                  * Add an entry for this interface.
 281                  */
 282                 if (pcap_add_if_win32(&devlist, name, desc, errbuf) == -1) {
 283                         /*
 284                          * Failure.
 285                          */
 286                         ret = -1;
 287                         break;
 288                 }
 289                 name += strlen(name) + 1;
 290                 desc += strlen(desc) + 1;
 291         }
 292
 293         if (ret == -1) {
 294                 /*
 295                  * We had an error; free the list we've been constructing.
 296                  */
 297                 if (devlist != NULL) {
 298                         pcap_freealldevs(devlist);
 299                         devlist = NULL;
 300                 }
 301         }
 302
 303         *alldevsp = devlist;
 304         free(AdaptersName);
 305         return (ret);
 306 }