dlls/iphlpapi/ifenum.c

   1 /* Copyright (C) 2003 Juan Lang
   2  *
   3  * This library is free software; you can redistribute it and/or
   4  * modify it under the terms of the GNU Lesser General Public
   5  * License as published by the Free Software Foundation; either
   6  * version 2.1 of the License, or (at your option) any later version.
   7  *
   8  * This library is distributed in the hope that it will be useful,
   9  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  10  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  11  * Lesser General Public License for more details.
  12  *
  13  * You should have received a copy of the GNU Lesser General Public
  14  * License along with this library; if not, write to the Free Software
  15  * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
  16  *
  17  * Implementation notes
  18  * Interface index fun:
  19  * - Windows may rely on an index being cleared in the topmost 8 bits in some
  20  *   APIs; see GetFriendlyIfIndex and the mention of "backward compatible"
  21  *   indexes.  It isn't clear which APIs might fail with non-backward-compatible
  22  *   indexes, but I'll keep them bits clear just in case.
  23  * - Even though if_nametoindex and if_indextoname seem to be pretty portable,
  24  *   Linux, at any rate, uses the same interface index for all virtual
  25  *   interfaces of a real interface as well as for the real interface itself.
  26  *   If I used the Linux index as my index, this would break my statement that
  27  *   an index is a key, and that an interface has 0 or 1 IP addresses.
  28  *   If that behavior were consistent across UNIXen (I don't know), it could
  29  *   help me implement multiple IP addresses more in the Windows way.
  30  * I used to assert I could not use UNIX interface indexes as my iphlpapi
  31  * indexes due to restrictions in netapi32 and wsock32, but I have removed
  32  * those restrictions, so using if_nametoindex and if_indextoname rather
  33  * than my current mess would probably be better.
  34  * FIXME:
  35  * - I don't support IPv6 addresses here, since SIOCGIFCONF can't return them
  36  *
  37  * There are three implemened methods for determining the MAC address of an
  38  * interface:
  39  * - a specific IOCTL (Linux)
  40  * - looking in the ARP cache (at least Solaris)
  41  * - using the sysctl interface (FreeBSD and MacOSX)
  42  * Solaris and some others have SIOCGENADDR, but I haven't gotten that to work
  43  * on the Solaris boxes at SourceForge's compile farm, whereas SIOCGARP does.
  44  */
  45
  46 #include "config.h"
  47
  48 #include <stdarg.h>
  49 #include <stdio.h>
  50 #include <stdlib.h>
  51 #include <string.h>
  52
  53 #ifdef HAVE_UNISTD_H
  54 #include <unistd.h>
  55 #endif
  56
  57 #include <sys/types.h>
  58
  59 #ifdef HAVE_SYS_SOCKET_H
  60 #include <sys/socket.h>
  61 #endif
  62
  63 #ifdef HAVE_NETINET_IN_H
  64 #include <netinet/in.h>
  65 #endif
  66
  67 #ifdef HAVE_ARPA_INET_H
  68 #include <arpa/inet.h>
  69 #endif
  70
  71 #ifdef HAVE_NET_IF_H
  72 #include <net/if.h>
  73 #endif
  74
  75 #ifdef HAVE_NET_IF_ARP_H
  76 #include <net/if_arp.h>
  77 #endif
  78
  79 #ifdef HAVE_NET_ROUTE_H
  80 #include <net/route.h>
  81 #endif
  82
  83 #ifdef HAVE_SYS_IOCTL_H
  84 #include <sys/ioctl.h>
  85 #endif
  86
  87 #ifdef HAVE_SYS_SYSCTL_H
  88 #include <sys/sysctl.h>
  89 #endif
  90
  91 #ifdef HAVE_SYS_SOCKIO_H
  92 #include <sys/sockio.h>
  93 #endif
  94
  95 #ifdef HAVE_NET_IF_DL_H
  96 #include <net/if_dl.h>
  97 #endif
  98
  99 #ifdef HAVE_NET_IF_TYPES_H
 100 #include <net/if_types.h>
 101 #endif
 102
 103 #include "ifenum.h"
 104
 105 #ifdef HAVE_STRUCT_SOCKADDR_SA_LEN
 106 #define ifreq_len(ifr) \
 107  max(sizeof(struct ifreq), sizeof((ifr)->ifr_name)+(ifr)->ifr_addr.sa_len)
 108 #else
 109 #define ifreq_len(ifr) sizeof(struct ifreq)
 110 #endif
 111
 112 #ifndef ETH_ALEN
 113 #define ETH_ALEN 6
 114 #endif
 115
 116 #ifndef INADDR_NONE
 117 #define INADDR_NONE (~0U)
 118 #endif
 119
 120 #define INITIAL_INTERFACES_ASSUMED 4
 121
 122 #define INDEX_IS_LOOPBACK 0x00800000
 123
 124 /* Type declarations */
 125
 126 typedef struct _InterfaceNameMapEntry {
 127   char  name[IFNAMSIZ];
 128   BOOL  inUse;
 129   BOOL  usedLastPass;
 130 } InterfaceNameMapEntry;
 131
 132 typedef struct _InterfaceNameMap {
 133   DWORD numInterfaces;
 134   DWORD nextAvailable;
 135   DWORD numAllocated;
 136   InterfaceNameMapEntry table[1];
 137 } InterfaceNameMap;
 138
 139 /* Global variables */
 140
 141 static CRITICAL_SECTION mapCS;
 142 static InterfaceNameMap *gNonLoopbackInterfaceMap = NULL;
 143 static InterfaceNameMap *gLoopbackInterfaceMap = NULL;
 144
 145 /* Functions */
 146
 147 void interfaceMapInit(void)
 148 {
 149     InitializeCriticalSection(&mapCS);
 150 }
 151
 152 void interfaceMapFree(void)
 153 {
 154     DeleteCriticalSection(&mapCS);
 155     HeapFree(GetProcessHeap(), 0, gNonLoopbackInterfaceMap);
 156     HeapFree(GetProcessHeap(), 0, gLoopbackInterfaceMap);
 157 }
 158
 159 /* Sizes the passed-in map to have enough space for numInterfaces interfaces.
 160  * If map is NULL, allocates a new map.  If it is not, may reallocate the
 161  * existing map and return a map of increased size.  Returns the allocated map,
 162  * or NULL if it could not allocate a map of the requested size.
 163  */
 164 static InterfaceNameMap *sizeMap(InterfaceNameMap *map, DWORD numInterfaces)
 165 {
 166   if (!map) {
 167     numInterfaces = max(numInterfaces, INITIAL_INTERFACES_ASSUMED);
 168     map = HeapAlloc(GetProcessHeap(), HEAP_ZERO_MEMORY,
 169      sizeof(InterfaceNameMap) +
 170      (numInterfaces - 1) * sizeof(InterfaceNameMapEntry));
 171     if (map)
 172       map->numAllocated = numInterfaces;
 173   }
 174   else {
 175     if (map->numAllocated < numInterfaces) {
 176       map = HeapReAlloc(GetProcessHeap(), 0, map,
 177        sizeof(InterfaceNameMap) +
 178        (numInterfaces - 1) * sizeof(InterfaceNameMapEntry));
 179       if (map)
 180         memset(&map->table[map->numAllocated], 0,
 181          (numInterfaces - map->numAllocated) * sizeof(InterfaceNameMapEntry));
 182     }
 183   }
 184   return map;
 185 }
 186
 187 static int isLoopbackInterface(int fd, const char *name)
 188 {
 189   int ret = 0;
 190
 191   if (name) {
 192     struct ifreq ifr;
 193
 194     lstrcpynA(ifr.ifr_name, name, IFNAMSIZ);
 195     if (ioctl(fd, SIOCGIFFLAGS, &ifr) == 0)
 196       ret = ifr.ifr_flags & IFF_LOOPBACK;
 197   }
 198   return ret;
 199 }
 200
 201 static void countInterfaces(int fd, caddr_t buf, size_t len)
 202 {
 203   caddr_t ifPtr = buf;
 204   DWORD numNonLoopbackInterfaces = 0, numLoopbackInterfaces = 0;
 205
 206   while (ifPtr && ifPtr < buf + len) {
 207     struct ifreq *ifr = (struct ifreq *)ifPtr;
 208
 209     if (isLoopbackInterface(fd, ifr->ifr_name))
 210       numLoopbackInterfaces++;
 211     else
 212       numNonLoopbackInterfaces++;
 213     ifPtr += ifreq_len(ifr);
 214   }
 215   gNonLoopbackInterfaceMap = sizeMap(gNonLoopbackInterfaceMap,
 216    numNonLoopbackInterfaces);
 217   gLoopbackInterfaceMap = sizeMap(gLoopbackInterfaceMap,
 218    numLoopbackInterfaces);
 219 }
 220
 221 /* Stores the name in the given map, and increments the map's numInterfaces
 222  * member if stored successfully.  Will store in the same slot as previously if
 223  * usedLastPass is set, otherwise will store in a new slot.
 224  * Assumes map and name are not NULL, and the usedLastPass flag is set
 225  * correctly for each entry in the map, and that map->numInterfaces <
 226  * map->numAllocated.
 227  * FIXME: this is kind of expensive, doing a linear scan of the map with a
 228  * string comparison of each entry to find the old slot.
 229  */
 230 static void storeInterfaceInMap(InterfaceNameMap *map, const char *name)
 231 {
 232   if (map && name) {
 233     DWORD ndx;
 234     BOOL stored = FALSE;
 235
 236     /* look for previous slot, mark in use if so */
 237     for (ndx = 0; !stored && ndx < map->nextAvailable; ndx++) {
 238       if (map->table[ndx].usedLastPass && !strncmp(map->table[ndx].name, name,
 239        sizeof(map->table[ndx].name))) {
 240         map->table[ndx].inUse = TRUE;
 241         stored = TRUE;
 242       }
 243     }
 244     /* look for new slot */
 245     for (ndx = 0; !stored && ndx < map->numAllocated; ndx++) {
 246       if (!map->table[ndx].inUse) {
 247         lstrcpynA(map->table[ndx].name, name, IFNAMSIZ);
 248         map->table[ndx].inUse = TRUE;
 249         stored = TRUE;
 250         if (ndx >= map->nextAvailable)
 251           map->nextAvailable = ndx + 1;
 252       }
 253     }
 254     if (stored)
 255       map->numInterfaces++;
 256   }
 257 }
 258
 259 /* Sets all used entries' usedLastPass flag to their inUse flag, clears
 260  * their inUse flag, and clears their numInterfaces member.
 261  */
 262 static void markOldInterfaces(InterfaceNameMap *map)
 263 {
 264   if (map) {
 265     DWORD ndx;
 266
 267     map->numInterfaces = 0;
 268     for (ndx = 0; ndx < map->nextAvailable; ndx++) {
 269       map->table[ndx].usedLastPass = map->table[ndx].inUse;
 270       map->table[ndx].inUse = FALSE;
 271     }
 272   }
 273 }
 274
 275 static void classifyInterfaces(int fd, caddr_t buf, size_t len)
 276 {
 277   caddr_t ifPtr = buf;
 278
 279   markOldInterfaces(gNonLoopbackInterfaceMap);
 280   markOldInterfaces(gLoopbackInterfaceMap);
 281   while (ifPtr && ifPtr < buf + len) {
 282     struct ifreq *ifr = (struct ifreq *)ifPtr;
 283
 284     if (ifr->ifr_addr.sa_family == AF_INET) {
 285       if (isLoopbackInterface(fd, ifr->ifr_name))
 286         storeInterfaceInMap(gLoopbackInterfaceMap, ifr->ifr_name);
 287       else
 288         storeInterfaceInMap(gNonLoopbackInterfaceMap, ifr->ifr_name);
 289     }
 290     ifPtr += ifreq_len(ifr);
 291   }
 292 }
 293
 294 static void enumerateInterfaces(void)
 295 {
 296   int fd;
 297
 298   fd = socket(PF_INET, SOCK_DGRAM, 0);
 299   if (fd != -1) {
 300     int ret, guessedNumInterfaces;
 301     struct ifconf ifc;
 302
 303     /* try to avoid silly heap action by starting with the right size buffer */
 304     guessedNumInterfaces = 0;
 305     if (gNonLoopbackInterfaceMap)
 306       guessedNumInterfaces += gNonLoopbackInterfaceMap->numInterfaces;
 307     if (gLoopbackInterfaceMap)
 308       guessedNumInterfaces += gLoopbackInterfaceMap->numInterfaces;
 309
 310     ret = 0;
 311     memset(&ifc, 0, sizeof(ifc));
 312     /* there is no way to know the interface count beforehand,
 313        so we need to loop again and again upping our max each time
 314        until returned < max */
 315     do {
 316       if (guessedNumInterfaces == 0)
 317         guessedNumInterfaces = INITIAL_INTERFACES_ASSUMED;
 318       else
 319         guessedNumInterfaces *= 2;
 320       HeapFree(GetProcessHeap(), 0, ifc.ifc_buf);
 321       ifc.ifc_len = sizeof(struct ifreq) * guessedNumInterfaces;
 322       ifc.ifc_buf = HeapAlloc(GetProcessHeap(), 0, ifc.ifc_len);
 323       ret = ioctl(fd, SIOCGIFCONF, &ifc);
 324     } while (ret == 0 &&
 325      ifc.ifc_len == (sizeof(struct ifreq) * guessedNumInterfaces));
 326
 327     if (ret == 0) {
 328       EnterCriticalSection(&mapCS);
 329       countInterfaces(fd, ifc.ifc_buf, ifc.ifc_len);
 330       classifyInterfaces(fd, ifc.ifc_buf, ifc.ifc_len);
 331       LeaveCriticalSection(&mapCS);
 332     }
 333
 334     HeapFree(GetProcessHeap(), 0, ifc.ifc_buf);
 335     close(fd);
 336   }
 337 }
 338
 339 DWORD getNumNonLoopbackInterfaces(void)
 340 {
 341   enumerateInterfaces();
 342   return gNonLoopbackInterfaceMap ? gNonLoopbackInterfaceMap->numInterfaces : 0;
 343 }
 344
 345 DWORD getNumInterfaces(void)
 346 {
 347   DWORD ret = getNumNonLoopbackInterfaces();
 348
 349   ret += gLoopbackInterfaceMap ? gLoopbackInterfaceMap->numInterfaces : 0;
 350   return ret;
 351 }
 352
 353 const char *getInterfaceNameByIndex(DWORD index)
 354 {
 355   DWORD realIndex;
 356   InterfaceNameMap *map;
 357   const char *ret = NULL;
 358
 359   EnterCriticalSection(&mapCS);
 360   if (index & INDEX_IS_LOOPBACK) {
 361     realIndex = index ^ INDEX_IS_LOOPBACK;
 362     map = gLoopbackInterfaceMap;
 363   }
 364   else {
 365     realIndex = index;
 366     map = gNonLoopbackInterfaceMap;
 367   }
 368   if (map && realIndex < map->nextAvailable)
 369     ret = map->table[realIndex].name;
 370   LeaveCriticalSection(&mapCS);
 371   return ret;
 372 }
 373
 374 DWORD getInterfaceIndexByName(const char *name, PDWORD index)
 375 {
 376   DWORD ndx, ret;
 377   BOOL found = FALSE;
 378
 379   if (!name)
 380     return ERROR_INVALID_PARAMETER;
 381   if (!index)
 382     return ERROR_INVALID_PARAMETER;
 383
 384   EnterCriticalSection(&mapCS);
 385   for (ndx = 0; !found && gNonLoopbackInterfaceMap &&
 386    ndx < gNonLoopbackInterfaceMap->nextAvailable; ndx++)
 387     if (!strncmp(gNonLoopbackInterfaceMap->table[ndx].name, name, IFNAMSIZ)) {
 388       found = TRUE;
 389       *index = ndx;
 390     }
 391   for (ndx = 0; !found && gLoopbackInterfaceMap &&
 392    ndx < gLoopbackInterfaceMap->nextAvailable; ndx++)
 393     if (!strncmp(gLoopbackInterfaceMap->table[ndx].name, name, IFNAMSIZ)) {
 394       found = TRUE;
 395       *index = ndx | INDEX_IS_LOOPBACK;
 396     }
 397   LeaveCriticalSection(&mapCS);
 398   if (found)
 399     ret = NO_ERROR;
 400   else
 401     ret = ERROR_INVALID_DATA;
 402   return ret;
 403 }
 404
 405 static void addMapEntriesToIndexTable(InterfaceIndexTable *table,
 406  const InterfaceNameMap *map)
 407 {
 408   if (table && map) {
 409     DWORD ndx;
 410
 411     for (ndx = 0; ndx < map->nextAvailable &&
 412      table->numIndexes < table->numAllocated; ndx++)
 413       if (map->table[ndx].inUse) {
 414         DWORD externalNdx = ndx;
 415
 416         if (map == gLoopbackInterfaceMap)
 417           externalNdx |= INDEX_IS_LOOPBACK;
 418         table->indexes[table->numIndexes++] = externalNdx;
 419       }
 420   }
 421 }
 422
 423 InterfaceIndexTable *getInterfaceIndexTable(void)
 424 {
 425   DWORD numInterfaces;
 426   InterfaceIndexTable *ret;
 427
 428   EnterCriticalSection(&mapCS);
 429   numInterfaces = getNumInterfaces();
 430   ret = HeapAlloc(GetProcessHeap(), HEAP_ZERO_MEMORY,
 431    sizeof(InterfaceIndexTable) + (numInterfaces - 1) * sizeof(DWORD));
 432   if (ret) {
 433     ret->numAllocated = numInterfaces;
 434     addMapEntriesToIndexTable(ret, gNonLoopbackInterfaceMap);
 435     addMapEntriesToIndexTable(ret, gLoopbackInterfaceMap);
 436   }
 437   LeaveCriticalSection(&mapCS);
 438   return ret;
 439 }
 440
 441 InterfaceIndexTable *getNonLoopbackInterfaceIndexTable(void)
 442 {
 443   DWORD numInterfaces;
 444   InterfaceIndexTable *ret;
 445
 446   EnterCriticalSection(&mapCS);
 447   numInterfaces = getNumNonLoopbackInterfaces();
 448   ret = HeapAlloc(GetProcessHeap(), HEAP_ZERO_MEMORY,
 449    sizeof(InterfaceIndexTable) + (numInterfaces - 1) * sizeof(DWORD));
 450   if (ret) {
 451     ret->numAllocated = numInterfaces;
 452     addMapEntriesToIndexTable(ret, gNonLoopbackInterfaceMap);
 453   }
 454   LeaveCriticalSection(&mapCS);
 455   return ret;
 456 }
 457
 458 DWORD getInterfaceIPAddrByName(const char *name)
 459 {
 460   DWORD ret = INADDR_ANY;
 461
 462   if (name) {
 463     int fd = socket(PF_INET, SOCK_DGRAM, 0);
 464
 465     if (fd != -1) {
 466       struct ifreq ifr;
 467
 468       lstrcpynA(ifr.ifr_name, name, IFNAMSIZ);
 469       if (ioctl(fd, SIOCGIFADDR, &ifr) == 0)
 470         memcpy(&ret, ifr.ifr_addr.sa_data + 2, sizeof(DWORD));
 471       close(fd);
 472     }
 473   }
 474   return ret;
 475 }
 476
 477 DWORD getInterfaceIPAddrByIndex(DWORD index)
 478 {
 479   DWORD ret;
 480   const char *name = getInterfaceNameByIndex(index);
 481
 482   if (name)
 483     ret = getInterfaceIPAddrByName(name);
 484   else
 485     ret = INADDR_ANY;
 486   return ret;
 487 }
 488
 489 DWORD getInterfaceBCastAddrByName(const char *name)
 490 {
 491   DWORD ret = INADDR_ANY;
 492
 493   if (name) {
 494     int fd = socket(PF_INET, SOCK_DGRAM, 0);
 495
 496     if (fd != -1) {
 497       struct ifreq ifr;
 498
 499       lstrcpynA(ifr.ifr_name, name, IFNAMSIZ);
 500       if (ioctl(fd, SIOCGIFBRDADDR, &ifr) == 0)
 501         memcpy(&ret, ifr.ifr_addr.sa_data + 2, sizeof(DWORD));
 502       close(fd);
 503     }
 504   }
 505   return ret;
 506 }
 507
 508 DWORD getInterfaceBCastAddrByIndex(DWORD index)
 509 {
 510   DWORD ret;
 511   const char *name = getInterfaceNameByIndex(index);
 512
 513   if (name)
 514     ret = getInterfaceBCastAddrByName(name);
 515   else
 516     ret = INADDR_ANY;
 517   return ret;
 518 }
 519
 520 DWORD getInterfaceMaskByName(const char *name)
 521 {
 522   DWORD ret = INADDR_NONE;
 523
 524   if (name) {
 525     int fd = socket(PF_INET, SOCK_DGRAM, 0);
 526
 527     if (fd != -1) {
 528       struct ifreq ifr;
 529
 530       lstrcpynA(ifr.ifr_name, name, IFNAMSIZ);
 531       if (ioctl(fd, SIOCGIFNETMASK, &ifr) == 0)
 532         memcpy(&ret, ifr.ifr_addr.sa_data + 2, sizeof(DWORD));
 533       close(fd);
 534     }
 535   }
 536   return ret;
 537 }
 538
 539 DWORD getInterfaceMaskByIndex(DWORD index)
 540 {
 541   DWORD ret;
 542   const char *name = getInterfaceNameByIndex(index);
 543
 544   if (name)
 545     ret = getInterfaceMaskByName(name);
 546   else
 547     ret = INADDR_NONE;
 548   return ret;
 549 }
 550
 551 #if defined (SIOCGIFHWADDR)
 552 DWORD getInterfacePhysicalByName(const char *name, PDWORD len, PBYTE addr,
 553  PDWORD type)
 554 {
 555   DWORD ret;
 556   int fd;
 557
 558   if (!name || !len || !addr || !type)
 559     return ERROR_INVALID_PARAMETER;
 560
 561   fd = socket(PF_INET, SOCK_DGRAM, 0);
 562   if (fd != -1) {
 563     struct ifreq ifr;
 564
 565     memset(&ifr, 0, sizeof(struct ifreq));
 566     lstrcpynA(ifr.ifr_name, name, IFNAMSIZ);
 567     if ((ioctl(fd, SIOCGIFHWADDR, &ifr)))
 568       ret = ERROR_INVALID_DATA;
 569     else {
 570       unsigned int addrLen;
 571
 572       switch (ifr.ifr_hwaddr.sa_family)
 573       {
 574 #ifdef ARPHRD_LOOPBACK
 575         case ARPHRD_LOOPBACK:
 576           addrLen = 0;
 577           *type = MIB_IF_TYPE_LOOPBACK;
 578           break;
 579 #endif
 580 #ifdef ARPHRD_ETHER
 581         case ARPHRD_ETHER:
 582           addrLen = ETH_ALEN;
 583           *type = MIB_IF_TYPE_ETHERNET;
 584           break;
 585 #endif
 586 #ifdef ARPHRD_FDDI
 587         case ARPHRD_FDDI:
 588           addrLen = ETH_ALEN;
 589           *type = MIB_IF_TYPE_FDDI;
 590           break;
 591 #endif
 592 #ifdef ARPHRD_IEEE802
 593         case ARPHRD_IEEE802: /* 802.2 Ethernet && Token Ring, guess TR? */
 594           addrLen = ETH_ALEN;
 595           *type = MIB_IF_TYPE_TOKENRING;
 596           break;
 597 #endif
 598 #ifdef ARPHRD_IEEE802_TR
 599         case ARPHRD_IEEE802_TR: /* also Token Ring? */
 600           addrLen = ETH_ALEN;
 601           *type = MIB_IF_TYPE_TOKENRING;
 602           break;
 603 #endif
 604 #ifdef ARPHRD_SLIP
 605         case ARPHRD_SLIP:
 606           addrLen = 0;
 607           *type = MIB_IF_TYPE_SLIP;
 608           break;
 609 #endif
 610 #ifdef ARPHRD_PPP
 611         case ARPHRD_PPP:
 612           addrLen = 0;
 613           *type = MIB_IF_TYPE_PPP;
 614           break;
 615 #endif
 616         default:
 617           addrLen = min(MAX_INTERFACE_PHYSADDR, sizeof(ifr.ifr_hwaddr.sa_data));
 618           *type = MIB_IF_TYPE_OTHER;
 619       }
 620       if (addrLen > *len) {
 621         ret = ERROR_INSUFFICIENT_BUFFER;
 622         *len = addrLen;
 623       }
 624       else {
 625         if (addrLen > 0)
 626           memcpy(addr, ifr.ifr_hwaddr.sa_data, addrLen);
 627         /* zero out remaining bytes for broken implementations */
 628         memset(addr + addrLen, 0, *len - addrLen);
 629         *len = addrLen;
 630         ret = NO_ERROR;
 631       }
 632     }
 633     close(fd);
 634   }
 635   else
 636     ret = ERROR_NO_MORE_FILES;
 637   return ret;
 638 }
 639 #elif defined (SIOCGARP)
 640 DWORD getInterfacePhysicalByName(const char *name, PDWORD len, PBYTE addr,
 641  PDWORD type)
 642 {
 643   DWORD ret;
 644   int fd;
 645
 646   if (!name || !len || !addr || !type)
 647     return ERROR_INVALID_PARAMETER;
 648
 649   fd = socket(PF_INET, SOCK_DGRAM, 0);
 650   if (fd != -1) {
 651     if (isLoopbackInterface(fd, name)) {
 652       *type = MIB_IF_TYPE_LOOPBACK;
 653       memset(addr, 0, *len);
 654       *len = 0;
 655       ret=NOERROR;
 656     }
 657     else {
 658       struct arpreq arp;
 659       struct sockaddr_in *saddr;
 660
 661       memset(&arp, 0, sizeof(struct arpreq));
 662       arp.arp_pa.sa_family = AF_INET;
 663       saddr = (struct sockaddr_in *)&arp; /* proto addr is first member */
 664       saddr->sin_family = AF_INET;
 665       saddr->sin_addr.s_addr = getInterfaceIPAddrByName(name);
 666       if ((ioctl(fd, SIOCGARP, &arp)))
 667         ret = ERROR_INVALID_DATA;
 668       else {
 669         /* FIXME:  heh:  who said it was ethernet? */
 670         int addrLen = ETH_ALEN;
 671
 672         if (addrLen > *len) {
 673           ret = ERROR_INSUFFICIENT_BUFFER;
 674           *len = addrLen;
 675         }
 676         else {
 677           if (addrLen > 0)
 678             memcpy(addr, &arp.arp_ha.sa_data[0], addrLen);
 679           /* zero out remaining bytes for broken implementations */
 680           memset(addr + addrLen, 0, *len - addrLen);
 681           *len = addrLen;
 682           *type = MIB_IF_TYPE_ETHERNET;
 683           ret = NO_ERROR;
 684         }
 685       }
 686     }
 687     close(fd);
 688   }
 689     else
 690       ret = ERROR_NO_MORE_FILES;
 691
 692   return ret;
 693 }
 694 #elif defined (HAVE_SYS_SYSCTL_H) && defined (HAVE_NET_IF_DL_H)
 695 DWORD getInterfacePhysicalByName(const char *name, PDWORD len, PBYTE addr,
 696  PDWORD type)
 697 {
 698   DWORD ret;
 699   struct if_msghdr *ifm;
 700   struct sockaddr_dl *sdl;
 701   u_char *p, *buf;
 702   size_t mibLen;
 703   int mib[] = { CTL_NET, AF_ROUTE, 0, AF_LINK, NET_RT_IFLIST, 0 };
 704   int addrLen;
 705   BOOL found = FALSE;
 706
 707   if (!name || !len || !addr || !type)
 708     return ERROR_INVALID_PARAMETER;
 709
 710   if (sysctl(mib, 6, NULL, &mibLen, NULL, 0) < 0)
 711     return ERROR_NO_MORE_FILES;
 712
 713   buf = HeapAlloc(GetProcessHeap(), 0, mibLen);
 714   if (!buf)
 715     return ERROR_NOT_ENOUGH_MEMORY;
 716
 717   if (sysctl(mib, 6, buf, &mibLen, NULL, 0) < 0) {
 718     HeapFree(GetProcessHeap(), 0, buf);
 719     return ERROR_NO_MORE_FILES;
 720   }
 721
 722   ret = ERROR_INVALID_DATA;
 723   for (p = buf; !found && p < buf + mibLen; p += ifm->ifm_msglen) {
 724     ifm = (struct if_msghdr *)p;
 725     sdl = (struct sockaddr_dl *)(ifm + 1);
 726
 727     if (ifm->ifm_type != RTM_IFINFO || (ifm->ifm_addrs & RTA_IFP) == 0)
 728       continue;
 729
 730     if (sdl->sdl_family != AF_LINK || sdl->sdl_nlen == 0 ||
 731      memcmp(sdl->sdl_data, name, max(sdl->sdl_nlen, strlen(name))) != 0)
 732       continue;
 733
 734     found = TRUE;
 735     addrLen = min(MAX_INTERFACE_PHYSADDR, sdl->sdl_alen);
 736     if (addrLen > *len) {
 737       ret = ERROR_INSUFFICIENT_BUFFER;
 738       *len = addrLen;
 739     }
 740     else {
 741       if (addrLen > 0)
 742         memcpy(addr, LLADDR(sdl), addrLen);
 743       /* zero out remaining bytes for broken implementations */
 744       memset(addr + addrLen, 0, *len - addrLen);
 745       *len = addrLen;
 746 #if defined(HAVE_NET_IF_TYPES_H)
 747       switch (sdl->sdl_type)
 748       {
 749         case IFT_ETHER:
 750           *type = MIB_IF_TYPE_ETHERNET;
 751           break;
 752         case IFT_FDDI:
 753           *type = MIB_IF_TYPE_FDDI;
 754           break;
 755         case IFT_ISO88024: /* Token Bus */
 756           *type = MIB_IF_TYPE_TOKENRING;
 757           break;
 758         case IFT_ISO88025: /* Token Ring */
 759           *type = MIB_IF_TYPE_TOKENRING;
 760           break;
 761         case IFT_PPP:
 762           *type = MIB_IF_TYPE_PPP;
 763           break;
 764         case IFT_SLIP:
 765           *type = MIB_IF_TYPE_SLIP;
 766           break;
 767         case IFT_LOOP:
 768           *type = MIB_IF_TYPE_LOOPBACK;
 769           break;
 770         default:
 771           *type = MIB_IF_TYPE_OTHER;
 772       }
 773 #else
 774       /* default if we don't know */
 775       *type = MIB_IF_TYPE_ETHERNET;
 776 #endif
 777       ret = NO_ERROR;
 778     }
 779   }
 780   HeapFree(GetProcessHeap(), 0, buf);
 781   return ret;
 782 }
 783 #endif
 784
 785 DWORD getInterfacePhysicalByIndex(DWORD index, PDWORD len, PBYTE addr,
 786  PDWORD type)
 787 {
 788   const char *name = getInterfaceNameByIndex(index);
 789
 790   if (name)
 791     return getInterfacePhysicalByName(name, len, addr, type);
 792   else
 793     return ERROR_INVALID_DATA;
 794 }
 795
 796 DWORD getInterfaceMtuByName(const char *name, PDWORD mtu)
 797 {
 798   DWORD ret;
 799   int fd;
 800
 801   if (!name)
 802     return ERROR_INVALID_PARAMETER;
 803   if (!mtu)
 804     return ERROR_INVALID_PARAMETER;
 805
 806   fd = socket(PF_INET, SOCK_DGRAM, 0);
 807   if (fd != -1) {
 808     struct ifreq ifr;
 809
 810     lstrcpynA(ifr.ifr_name, name, IFNAMSIZ);
 811     if ((ioctl(fd, SIOCGIFMTU, &ifr)))
 812       ret = ERROR_INVALID_DATA;
 813     else {
 814 #ifndef __sun
 815       *mtu = ifr.ifr_mtu;
 816 #else
 817       *mtu = ifr.ifr_metric;
 818 #endif
 819       ret = NO_ERROR;
 820     }
 821   }
 822   else
 823     ret = ERROR_NO_MORE_FILES;
 824   return ret;
 825 }
 826
 827 DWORD getInterfaceMtuByIndex(DWORD index, PDWORD mtu)
 828 {
 829   const char *name = getInterfaceNameByIndex(index);
 830
 831   if (name)
 832     return getInterfaceMtuByName(name, mtu);
 833   else
 834     return ERROR_INVALID_DATA;
 835 }
 836
 837 DWORD getInterfaceStatusByName(const char *name, PDWORD status)
 838 {
 839   DWORD ret;
 840   int fd;
 841
 842   if (!name)
 843     return ERROR_INVALID_PARAMETER;
 844   if (!status)
 845     return ERROR_INVALID_PARAMETER;
 846
 847   fd = socket(PF_INET, SOCK_DGRAM, 0);
 848   if (fd != -1) {
 849     struct ifreq ifr;
 850
 851     lstrcpynA(ifr.ifr_name, name, IFNAMSIZ);
 852     if ((ioctl(fd, SIOCGIFFLAGS, &ifr)))
 853       ret = ERROR_INVALID_DATA;
 854     else {
 855       if (ifr.ifr_flags & IFF_UP)
 856         *status = MIB_IF_OPER_STATUS_OPERATIONAL;
 857       else
 858         *status = MIB_IF_OPER_STATUS_NON_OPERATIONAL;
 859       ret = NO_ERROR;
 860     }
 861   }
 862   else
 863     ret = ERROR_NO_MORE_FILES;
 864   return ret;
 865 }
 866
 867 DWORD getInterfaceStatusByIndex(DWORD index, PDWORD status)
 868 {
 869   const char *name = getInterfaceNameByIndex(index);
 870
 871   if (name)
 872     return getInterfaceStatusByName(name, status);
 873   else
 874     return ERROR_INVALID_DATA;
 875 }
 876
 877 DWORD getInterfaceEntryByName(const char *name, PMIB_IFROW entry)
 878 {
 879   BYTE addr[MAX_INTERFACE_PHYSADDR];
 880   DWORD ret, len = sizeof(addr), type;
 881
 882   if (!name)
 883     return ERROR_INVALID_PARAMETER;
 884   if (!entry)
 885     return ERROR_INVALID_PARAMETER;
 886
 887   if (getInterfacePhysicalByName(name, &len, addr, &type) == NO_ERROR) {
 888     WCHAR *assigner;
 889     const char *walker;
 890
 891     memset(entry, 0, sizeof(MIB_IFROW));
 892     for (assigner = entry->wszName, walker = name; *walker;
 893      walker++, assigner++)
 894       *assigner = *walker;
 895     *assigner = 0;
 896     getInterfaceIndexByName(name, &entry->dwIndex);
 897     entry->dwPhysAddrLen = len;
 898     memcpy(entry->bPhysAddr, addr, len);
 899     memset(entry->bPhysAddr + len, 0, sizeof(entry->bPhysAddr) - len);
 900     entry->dwType = type;
 901     /* FIXME: how to calculate real speed? */
 902     getInterfaceMtuByName(name, &entry->dwMtu);
 903     /* lie, there's no "administratively down" here */
 904     entry->dwAdminStatus = MIB_IF_ADMIN_STATUS_UP;
 905     getInterfaceStatusByName(name, &entry->dwOperStatus);
 906     /* punt on dwLastChange? */
 907     entry->dwDescrLen = min(strlen(name), MAX_INTERFACE_DESCRIPTION - 1);
 908     memcpy(entry->bDescr, name, entry->dwDescrLen);
 909     entry->bDescr[entry->dwDescrLen] = '\0';
 910     entry->dwDescrLen++;
 911     ret = NO_ERROR;
 912   }
 913   else
 914     ret = ERROR_INVALID_DATA;
 915   return ret;
 916 }
 917
 918 DWORD getInterfaceEntryByIndex(DWORD index, PMIB_IFROW entry)
 919 {
 920   const char *name = getInterfaceNameByIndex(index);
 921
 922   if (name)
 923     return getInterfaceEntryByName(name, entry);
 924   else
 925     return ERROR_INVALID_DATA;
 926 }
 927
 928 char *toIPAddressString(unsigned int addr, char string[16])
 929 {
 930   if (string) {
 931     struct in_addr iAddr;
 932
 933     iAddr.s_addr = addr;
 934     /* extra-anal, just to make auditors happy */
 935     lstrcpynA(string, inet_ntoa(iAddr), 16);
 936   }
 937   return string;
 938 }