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

   1 /*
   2  * Copyright (c) 1999, 2002
   3  *      Politecnico di Torino.  All rights reserved.
   4  *
   5  * Redistribution and use in source and binary forms, with or without
   6  * modification, are permitted provided that: (1) source code distributions
   7  * retain the above copyright notice and this paragraph in its entirety, (2)
   8  * distributions including binary code include the above copyright notice and
   9  * this paragraph in its entirety in the documentation or other materials
  10  * provided with the distribution, and (3) all advertising materials mentioning
  11  * features or use of this software display the following acknowledgement:
  12  * ``This product includes software developed by the Politecnico
  13  * di Torino, and its contributors.'' Neither the name of
  14  * the University nor the names of its contributors may be used to endorse
  15  * or promote products derived from this software without specific prior
  16  * written permission.
  17  * THIS SOFTWARE IS PROVIDED ``AS IS'' AND WITHOUT ANY EXPRESS OR IMPLIED
  18  * WARRANTIES, INCLUDING, WITHOUT LIMITATION, THE IMPLIED WARRANTIES OF
  19  * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE.
  20  */
  21
  22 #ifndef lint
  23 static const char rcsid[] =
  24     "@(#) $Header: /tcpdump/master/libpcap/fad-win32.c,v 1.5 2003-03-12 13:28:54 risso Exp $ (LBL)";
  25 #endif
  26
  27 #ifdef HAVE_CONFIG_H
  28 #include "config.h"
  29 #endif
  30
  31 #include <pcap.h>
  32 #include <pcap-int.h>
  33 #include <packet32.h>
  34
  35 #include <errno.h>
  36
  37 #ifndef SA_LEN
  38 #ifdef HAVE_SOCKADDR_SA_LEN
  39 #define SA_LEN(addr)    ((addr)->sa_len)
  40 #else /* HAVE_SOCKADDR_SA_LEN */
  41 #define SA_LEN(addr)    (sizeof (struct sockaddr))
  42 #endif /* HAVE_SOCKADDR_SA_LEN */
  43 #endif /* SA_LEN */
  44
  45 /*
  46  * Add an entry to the list of addresses for an interface.
  47  * "curdev" is the entry for that interface.
  48  */
  49 static int
  50 add_addr_to_list(pcap_if_t *curdev, struct sockaddr *addr,
  51     struct sockaddr *netmask, struct sockaddr *broadaddr,
  52     struct sockaddr *dstaddr, char *errbuf)
  53 {
  54         pcap_addr_t *curaddr, *prevaddr, *nextaddr;
  55
  56         /*
  57          * Allocate the new entry and fill it in.
  58          */
  59         curaddr = (pcap_addr_t*)malloc(sizeof(pcap_addr_t));
  60         if (curaddr == NULL) {
  61                 (void)snprintf(errbuf, PCAP_ERRBUF_SIZE,
  62                     "malloc: %s", pcap_strerror(errno));
  63                 return (-1);
  64         }
  65
  66         curaddr->next = NULL;
  67         if (addr != NULL) {
  68                 curaddr->addr = (struct sockaddr*)dup_sockaddr(addr, SA_LEN(addr));
  69                 if (curaddr->addr == NULL) {
  70                         (void)snprintf(errbuf, PCAP_ERRBUF_SIZE,
  71                             "malloc: %s", pcap_strerror(errno));
  72                         free(curaddr);
  73                         return (-1);
  74                 }
  75         } else
  76                 curaddr->addr = NULL;
  77
  78         if (netmask != NULL) {
  79                 curaddr->netmask = (struct sockaddr*)dup_sockaddr(netmask, SA_LEN(netmask));
  80                 if (curaddr->netmask == NULL) {
  81                         (void)snprintf(errbuf, PCAP_ERRBUF_SIZE,
  82                             "malloc: %s", pcap_strerror(errno));
  83                         free(curaddr);
  84                         return (-1);
  85                 }
  86         } else
  87                 curaddr->netmask = NULL;
  88
  89         if (broadaddr != NULL) {
  90                 curaddr->broadaddr = (struct sockaddr*)dup_sockaddr(broadaddr, SA_LEN(broadaddr));
  91                 if (curaddr->broadaddr == NULL) {
  92                         (void)snprintf(errbuf, PCAP_ERRBUF_SIZE,
  93                             "malloc: %s", pcap_strerror(errno));
  94                         free(curaddr);
  95                         return (-1);
  96                 }
  97         } else
  98                 curaddr->broadaddr = NULL;
  99
 100         if (dstaddr != NULL) {
 101                 curaddr->dstaddr = (struct sockaddr*)dup_sockaddr(dstaddr, SA_LEN(dstaddr));
 102                 if (curaddr->dstaddr == NULL) {
 103                         (void)snprintf(errbuf, PCAP_ERRBUF_SIZE,
 104                             "malloc: %s", pcap_strerror(errno));
 105                         free(curaddr);
 106                         return (-1);
 107                 }
 108         } else
 109                 curaddr->dstaddr = NULL;
 110
 111         /*
 112          * Find the end of the list of addresses.
 113          */
 114         for (prevaddr = curdev->addresses; prevaddr != NULL; prevaddr = nextaddr) {
 115                 nextaddr = prevaddr->next;
 116                 if (nextaddr == NULL) {
 117                         /*
 118                          * This is the end of the list.
 119                          */
 120                         break;
 121                 }
 122         }
 123
 124         if (prevaddr == NULL) {
 125                 /*
 126                  * The list was empty; this is the first member.
 127                  */
 128                 curdev->addresses = curaddr;
 129         } else {
 130                 /*
 131                  * "prevaddr" is the last member of the list; append
 132                  * this member to it.
 133                  */
 134                 prevaddr->next = curaddr;
 135         }
 136
 137         return (0);
 138 }
 139
 140
 141 static int
 142 pcap_add_if_win32(pcap_if_t **devlist, char *name, const char *desc,
 143     char *errbuf)
 144 {
 145         pcap_if_t *curdev;
 146         npf_if_addr if_addrs[16];
 147         LONG if_addr_size;
 148         int res = 0;
 149
 150         if_addr_size = 16;
 151
 152         /*
 153          * Add an entry for this interface, with no addresses.
 154          */
 155         if (add_or_find_if(&curdev, devlist, (char *)name, 0, (char *)desc,
 156             errbuf) == -1) {
 157                 /*
 158                  * Failure.
 159                  */
 160                 return (-1);
 161         }
 162
 163         /*
 164          * Get the list of addresses for the interface.
 165          *
 166          * XXX - what about IPv6?
 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         DWORD dwVersion;
 222         DWORD dwWindowsMajorVersion;
 223         int ret = 0;
 224         const char *desc;
 225
 226         dwVersion = GetVersion();       /* get the OS version */
 227         dwWindowsMajorVersion =  (DWORD)(LOBYTE(LOWORD(dwVersion)));
 228         if (dwVersion >= 0x80000000 && dwWindowsMajorVersion >= 4) {
 229                 /*
 230                  * Windows 95, 98, ME.
 231                  */
 232                 char AdaptersName[8192];
 233                 ULONG NameLength = 8192;
 234                 char *name;
 235
 236                 if (!PacketGetAdapterNames(AdaptersName, &NameLength)) {
 237                         snprintf(errbuf, PCAP_ERRBUF_SIZE,
 238                             "PacketGetAdapterNames: %s",
 239                             pcap_win32strerror());
 240                         return (-1);
 241                 }
 242
 243                 /*
 244                  * "PacketGetAdapterNames()" returned a list of
 245                  * null-terminated ASCII interface name strings,
 246                  * terminated by a null string, followed by a list
 247                  * of null-terminated ASCII interface description
 248                  * strings, terminated by a null string.
 249                  * This means there are two ASCII nulls at the end
 250                  * of the first list.
 251                  *
 252                  * Find the end of the first list; that's the
 253                  * beginning of the second list.
 254                  */
 255                 desc = &AdaptersName[0];
 256                 while (*desc != '\0' || *(desc + 1) != '\0')
 257                         desc++;
 258
 259                 /*
 260                  * Found it - "desc" points to the first of the two
 261                  * nulls at the end of the list of names, so the
 262                  * first byte of the list of descriptions is two bytes
 263                  * after it.
 264                  */
 265                 desc += 2;
 266
 267                 /*
 268                  * Loop over the elements in the first list.
 269                  */
 270                 name = &AdaptersName[0];
 271                 while (*name != '\0') {
 272                         /*
 273                          * Add an entry for this interface.
 274                          */
 275                         if (pcap_add_if_win32(&devlist, name, desc,
 276                             errbuf) == -1) {
 277                                 /*
 278                                  * Failure.
 279                                  */
 280                                 ret = -1;
 281                                 break;
 282                         }
 283                         name += strlen(name) + 1;
 284                         desc += strlen(desc) + 1;
 285                 }
 286         } else {
 287                 /*
 288                  * Windows NT (NT 4.0, W2K, WXP).
 289                  */
 290                 WCHAR AdaptersName[8192];
 291                 ULONG NameLength = 8192;
 292                 const WCHAR *t;
 293                 WCHAR *uc_name;
 294                 char ascii_name[8192];
 295                 char ascii_desc[8192];
 296                 char *p;
 297
 298                 if (!PacketGetAdapterNames((PTSTR)AdaptersName, &NameLength)) {
 299                         snprintf(errbuf, PCAP_ERRBUF_SIZE,
 300                             "PacketGetAdapterNames: %s",
 301                             pcap_win32strerror());
 302                         return (-1);
 303                 }
 304
 305                 /*
 306                  * "PacketGetAdapterNames()" returned a list of
 307                  * null-terminated Unicode interface name strings,
 308                  * terminated by a null string, followed by a list
 309                  * of null-terminated ASCII interface description
 310                  * strings, terminated by a null string.
 311                  * This means there are two Unicode nulls at the end
 312                  * of the first list.
 313                  *
 314                  * Find the end of the first list; that's the
 315                  * beginning of the second list.
 316                  */
 317                 t = &AdaptersName[0];
 318                 while (*t != '\0' || *(t + 1) != '\0')
 319                         t++;
 320
 321                 /*
 322                  * Found it - "t" points to the first of the two
 323                  * nulls at the end of the list of names, so the
 324                  * first byte of the list of descriptions is two wide
 325                  * characters after it.
 326                  */
 327                 t += 2;
 328                 desc = (const char *)t;
 329
 330                 /*
 331                  * Loop over the elements in the first list.
 332                  *
 333                  * We assume all characters in the name string are valid
 334                  * ASCII characters.
 335                  */
 336                 uc_name = &AdaptersName[0];
 337                 while (*uc_name != '\0') {
 338                         p = ascii_name;
 339                         while ((*p++ = (char)*uc_name++) != '\0')
 340                                 ;
 341                         p = ascii_desc;
 342                         while ((*p++ = *desc++) != '\0')
 343                                 ;
 344
 345                         /*
 346                          * Add an entry for this interface.
 347                          */
 348                         if (pcap_add_if_win32(&devlist, ascii_name,
 349                             ascii_desc, errbuf) == -1) {
 350                                 /*
 351                                  * Failure.
 352                                  */
 353                                 ret = -1;
 354                                 break;
 355                         }
 356                 }
 357         }
 358
 359         if (ret == -1) {
 360                 /*
 361                  * We had an error; free the list we've been constructing.
 362                  */
 363                 if (devlist != NULL) {
 364                         pcap_freealldevs(devlist);
 365                         devlist = NULL;
 366                 }
 367         }
 368
 369         *alldevsp = devlist;
 370         return (ret);
 371 }