dlls/iphlpapi/ifenum.c

   1 /* Copyright (C) 2003,2006 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., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301, USA
  16  *
  17  * Implementation notes
  18  * FIXME:
  19  * - I don't support IPv6 addresses here, since SIOCGIFCONF can't return them
  20  *
  21  * There are three implemented methods for determining the MAC address of an
  22  * interface:
  23  * - a specific IOCTL (Linux)
  24  * - looking in the ARP cache (at least Solaris)
  25  * - using the sysctl interface (FreeBSD and Mac OS X)
  26  * Solaris and some others have SIOCGENADDR, but I haven't gotten that to work
  27  * on the Solaris boxes at SourceForge's compile farm, whereas SIOCGARP does.
  28  */
  29
  30 #include "config.h"
  31
  32 #include <stdarg.h>
  33 #include <stdio.h>
  34 #include <stdlib.h>
  35 #include <string.h>
  36
  37 #ifdef HAVE_UNISTD_H
  38 #include <unistd.h>
  39 #endif
  40
  41 #include <sys/types.h>
  42 #ifdef HAVE_SYS_PARAM_H
  43 #include <sys/param.h>
  44 #endif
  45
  46 #ifdef HAVE_SYS_SOCKET_H
  47 #include <sys/socket.h>
  48 #endif
  49
  50 #ifdef HAVE_NETINET_IN_H
  51 #include <netinet/in.h>
  52 #endif
  53
  54 #ifdef HAVE_ARPA_INET_H
  55 #include <arpa/inet.h>
  56 #endif
  57
  58 #ifdef HAVE_NET_IF_H
  59 #include <net/if.h>
  60 #endif
  61
  62 #ifdef HAVE_NET_IF_ARP_H
  63 #include <net/if_arp.h>
  64 #endif
  65
  66 #ifdef HAVE_NET_ROUTE_H
  67 #include <net/route.h>
  68 #endif
  69
  70 #ifdef HAVE_SYS_IOCTL_H
  71 #include <sys/ioctl.h>
  72 #endif
  73
  74 #ifdef HAVE_SYS_SYSCTL_H
  75 #include <sys/sysctl.h>
  76 #endif
  77
  78 #ifdef HAVE_SYS_SOCKIO_H
  79 #include <sys/sockio.h>
  80 #endif
  81
  82 #ifdef HAVE_NET_IF_DL_H
  83 #include <net/if_dl.h>
  84 #endif
  85
  86 #ifdef HAVE_NET_IF_TYPES_H
  87 #include <net/if_types.h>
  88 #endif
  89
  90 #ifdef HAVE_IFADDRS_H
  91 #include <ifaddrs.h>
  92 #endif
  93
  94 #include "ifenum.h"
  95 #include "ws2ipdef.h"
  96
  97 #ifdef HAVE_STRUCT_SOCKADDR_SA_LEN
  98 #define ifreq_len(ifr) \
  99  max(sizeof(struct ifreq), sizeof((ifr)->ifr_name)+(ifr)->ifr_addr.sa_len)
 100 #else
 101 #define ifreq_len(ifr) sizeof(struct ifreq)
 102 #endif
 103
 104 #ifndef ETH_ALEN
 105 #define ETH_ALEN 6
 106 #endif
 107
 108 #ifndef IF_NAMESIZE
 109 #define IF_NAMESIZE 16
 110 #endif
 111
 112 #ifndef INADDR_NONE
 113 #define INADDR_NONE (~0U)
 114 #endif
 115
 116 #define INITIAL_INTERFACES_ASSUMED 4
 117
 118 /* Functions */
 119
 120 static int isLoopbackInterface(int fd, const char *name)
 121 {
 122   int ret = 0;
 123
 124   if (name) {
 125     struct ifreq ifr;
 126
 127     lstrcpynA(ifr.ifr_name, name, IFNAMSIZ);
 128     if (ioctl(fd, SIOCGIFFLAGS, &ifr) == 0)
 129       ret = ifr.ifr_flags & IFF_LOOPBACK;
 130   }
 131   return ret;
 132 }
 133
 134 /* The comments say MAX_ADAPTER_NAME is required, but really only IF_NAMESIZE
 135  * bytes are necessary.
 136  */
 137 char *getInterfaceNameByIndex(DWORD index, char *name)
 138 {
 139   return if_indextoname(index, name);
 140 }
 141
 142 DWORD getInterfaceIndexByName(const char *name, PDWORD index)
 143 {
 144   DWORD ret;
 145   unsigned int idx;
 146
 147   if (!name)
 148     return ERROR_INVALID_PARAMETER;
 149   if (!index)
 150     return ERROR_INVALID_PARAMETER;
 151   idx = if_nametoindex(name);
 152   if (idx) {
 153     *index = idx;
 154     ret = NO_ERROR;
 155   }
 156   else
 157     ret = ERROR_INVALID_DATA;
 158   return ret;
 159 }
 160
 161 BOOL isIfIndexLoopback(ULONG idx)
 162 {
 163   BOOL ret = FALSE;
 164   char name[IFNAMSIZ];
 165   int fd;
 166
 167   getInterfaceNameByIndex(idx, name);
 168   fd = socket(PF_INET, SOCK_DGRAM, 0);
 169   if (fd != -1) {
 170     ret = isLoopbackInterface(fd, name);
 171     close(fd);
 172   }
 173   return ret;
 174 }
 175
 176 DWORD getNumNonLoopbackInterfaces(void)
 177 {
 178   DWORD numInterfaces;
 179   int fd = socket(PF_INET, SOCK_DGRAM, 0);
 180
 181   if (fd != -1) {
 182     struct if_nameindex *indexes = if_nameindex();
 183
 184     if (indexes) {
 185       struct if_nameindex *p;
 186
 187       for (p = indexes, numInterfaces = 0; p && p->if_name; p++)
 188         if (!isLoopbackInterface(fd, p->if_name))
 189           numInterfaces++;
 190       if_freenameindex(indexes);
 191     }
 192     else
 193       numInterfaces = 0;
 194     close(fd);
 195   }
 196   else
 197     numInterfaces = 0;
 198   return numInterfaces;
 199 }
 200
 201 DWORD getNumInterfaces(void)
 202 {
 203   DWORD numInterfaces;
 204   struct if_nameindex *indexes = if_nameindex();
 205
 206   if (indexes) {
 207     struct if_nameindex *p;
 208
 209     for (p = indexes, numInterfaces = 0; p && p->if_name; p++)
 210       numInterfaces++;
 211     if_freenameindex(indexes);
 212   }
 213   else
 214     numInterfaces = 0;
 215   return numInterfaces;
 216 }
 217
 218 InterfaceIndexTable *getInterfaceIndexTable(void)
 219 {
 220   DWORD numInterfaces;
 221   InterfaceIndexTable *ret;
 222   struct if_nameindex *indexes = if_nameindex();
 223
 224   if (indexes) {
 225     struct if_nameindex *p;
 226     DWORD size = sizeof(InterfaceIndexTable);
 227
 228     for (p = indexes, numInterfaces = 0; p && p->if_name; p++)
 229       numInterfaces++;
 230     if (numInterfaces > 1)
 231       size += (numInterfaces - 1) * sizeof(DWORD);
 232     ret = HeapAlloc(GetProcessHeap(), 0, size);
 233     if (ret) {
 234       ret->numIndexes = 0;
 235       for (p = indexes; p && p->if_name; p++)
 236         ret->indexes[ret->numIndexes++] = p->if_index;
 237     }
 238     if_freenameindex(indexes);
 239   }
 240   else
 241     ret = NULL;
 242   return ret;
 243 }
 244
 245 InterfaceIndexTable *getNonLoopbackInterfaceIndexTable(void)
 246 {
 247   DWORD numInterfaces;
 248   InterfaceIndexTable *ret;
 249   int fd = socket(PF_INET, SOCK_DGRAM, 0);
 250
 251   if (fd != -1) {
 252     struct if_nameindex *indexes = if_nameindex();
 253
 254     if (indexes) {
 255       struct if_nameindex *p;
 256       DWORD size = sizeof(InterfaceIndexTable);
 257
 258       for (p = indexes, numInterfaces = 0; p && p->if_name; p++)
 259         if (!isLoopbackInterface(fd, p->if_name))
 260           numInterfaces++;
 261       if (numInterfaces > 1)
 262         size += (numInterfaces - 1) * sizeof(DWORD);
 263       ret = HeapAlloc(GetProcessHeap(), 0, size);
 264       if (ret) {
 265         ret->numIndexes = 0;
 266         for (p = indexes; p && p->if_name; p++)
 267           if (!isLoopbackInterface(fd, p->if_name))
 268             ret->indexes[ret->numIndexes++] = p->if_index;
 269       }
 270       if_freenameindex(indexes);
 271     }
 272     else
 273       ret = NULL;
 274     close(fd);
 275   }
 276   else
 277     ret = NULL;
 278   return ret;
 279 }
 280
 281 static DWORD getInterfaceBCastAddrByName(const char *name)
 282 {
 283   DWORD ret = INADDR_ANY;
 284
 285   if (name) {
 286     int fd = socket(PF_INET, SOCK_DGRAM, 0);
 287
 288     if (fd != -1) {
 289       struct ifreq ifr;
 290
 291       lstrcpynA(ifr.ifr_name, name, IFNAMSIZ);
 292       if (ioctl(fd, SIOCGIFBRDADDR, &ifr) == 0)
 293         memcpy(&ret, ifr.ifr_addr.sa_data + 2, sizeof(DWORD));
 294       close(fd);
 295     }
 296   }
 297   return ret;
 298 }
 299
 300 static DWORD getInterfaceMaskByName(const char *name)
 301 {
 302   DWORD ret = INADDR_NONE;
 303
 304   if (name) {
 305     int fd = socket(PF_INET, SOCK_DGRAM, 0);
 306
 307     if (fd != -1) {
 308       struct ifreq ifr;
 309
 310       lstrcpynA(ifr.ifr_name, name, IFNAMSIZ);
 311       if (ioctl(fd, SIOCGIFNETMASK, &ifr) == 0)
 312         memcpy(&ret, ifr.ifr_addr.sa_data + 2, sizeof(DWORD));
 313       close(fd);
 314     }
 315   }
 316   return ret;
 317 }
 318
 319 #if defined (SIOCGIFHWADDR) && defined (HAVE_STRUCT_IFREQ_IFR_HWADDR)
 320 static DWORD getInterfacePhysicalByName(const char *name, PDWORD len, PBYTE addr,
 321  PDWORD type)
 322 {
 323   DWORD ret;
 324   int fd;
 325
 326   if (!name || !len || !addr || !type)
 327     return ERROR_INVALID_PARAMETER;
 328
 329   fd = socket(PF_INET, SOCK_DGRAM, 0);
 330   if (fd != -1) {
 331     struct ifreq ifr;
 332
 333     memset(&ifr, 0, sizeof(struct ifreq));
 334     lstrcpynA(ifr.ifr_name, name, IFNAMSIZ);
 335     if ((ioctl(fd, SIOCGIFHWADDR, &ifr)))
 336       ret = ERROR_INVALID_DATA;
 337     else {
 338       unsigned int addrLen;
 339
 340       switch (ifr.ifr_hwaddr.sa_family)
 341       {
 342 #ifdef ARPHRD_LOOPBACK
 343         case ARPHRD_LOOPBACK:
 344           addrLen = 0;
 345           *type = MIB_IF_TYPE_LOOPBACK;
 346           break;
 347 #endif
 348 #ifdef ARPHRD_ETHER
 349         case ARPHRD_ETHER:
 350           addrLen = ETH_ALEN;
 351           *type = MIB_IF_TYPE_ETHERNET;
 352           break;
 353 #endif
 354 #ifdef ARPHRD_FDDI
 355         case ARPHRD_FDDI:
 356           addrLen = ETH_ALEN;
 357           *type = MIB_IF_TYPE_FDDI;
 358           break;
 359 #endif
 360 #ifdef ARPHRD_IEEE802
 361         case ARPHRD_IEEE802: /* 802.2 Ethernet && Token Ring, guess TR? */
 362           addrLen = ETH_ALEN;
 363           *type = MIB_IF_TYPE_TOKENRING;
 364           break;
 365 #endif
 366 #ifdef ARPHRD_IEEE802_TR
 367         case ARPHRD_IEEE802_TR: /* also Token Ring? */
 368           addrLen = ETH_ALEN;
 369           *type = MIB_IF_TYPE_TOKENRING;
 370           break;
 371 #endif
 372 #ifdef ARPHRD_SLIP
 373         case ARPHRD_SLIP:
 374           addrLen = 0;
 375           *type = MIB_IF_TYPE_SLIP;
 376           break;
 377 #endif
 378 #ifdef ARPHRD_PPP
 379         case ARPHRD_PPP:
 380           addrLen = 0;
 381           *type = MIB_IF_TYPE_PPP;
 382           break;
 383 #endif
 384         default:
 385           addrLen = min(MAX_INTERFACE_PHYSADDR, sizeof(ifr.ifr_hwaddr.sa_data));
 386           *type = MIB_IF_TYPE_OTHER;
 387       }
 388       if (addrLen > *len) {
 389         ret = ERROR_INSUFFICIENT_BUFFER;
 390         *len = addrLen;
 391       }
 392       else {
 393         if (addrLen > 0)
 394           memcpy(addr, ifr.ifr_hwaddr.sa_data, addrLen);
 395         /* zero out remaining bytes for broken implementations */
 396         memset(addr + addrLen, 0, *len - addrLen);
 397         *len = addrLen;
 398         ret = NO_ERROR;
 399       }
 400     }
 401     close(fd);
 402   }
 403   else
 404     ret = ERROR_NO_MORE_FILES;
 405   return ret;
 406 }
 407 #elif defined (SIOCGARP)
 408 static DWORD getInterfacePhysicalByName(const char *name, PDWORD len, PBYTE addr,
 409  PDWORD type)
 410 {
 411   DWORD ret;
 412   int fd;
 413
 414   if (!name || !len || !addr || !type)
 415     return ERROR_INVALID_PARAMETER;
 416
 417   fd = socket(PF_INET, SOCK_DGRAM, 0);
 418   if (fd != -1) {
 419     if (isLoopbackInterface(fd, name)) {
 420       *type = MIB_IF_TYPE_LOOPBACK;
 421       memset(addr, 0, *len);
 422       *len = 0;
 423       ret=NOERROR;
 424     }
 425     else {
 426       struct arpreq arp;
 427       struct sockaddr_in *saddr;
 428       struct ifreq ifr;
 429
 430       /* get IP addr */
 431       lstrcpynA(ifr.ifr_name, name, IFNAMSIZ);
 432       ioctl(fd, SIOCGIFADDR, &ifr);
 433       memset(&arp, 0, sizeof(struct arpreq));
 434       arp.arp_pa.sa_family = AF_INET;
 435       saddr = (struct sockaddr_in *)&arp; /* proto addr is first member */
 436       saddr->sin_family = AF_INET;
 437       memcpy(&saddr->sin_addr.s_addr, ifr.ifr_addr.sa_data + 2, sizeof(DWORD));
 438       if ((ioctl(fd, SIOCGARP, &arp)))
 439         ret = ERROR_INVALID_DATA;
 440       else {
 441         /* FIXME:  heh:  who said it was ethernet? */
 442         int addrLen = ETH_ALEN;
 443
 444         if (addrLen > *len) {
 445           ret = ERROR_INSUFFICIENT_BUFFER;
 446           *len = addrLen;
 447         }
 448         else {
 449           if (addrLen > 0)
 450             memcpy(addr, &arp.arp_ha.sa_data[0], addrLen);
 451           /* zero out remaining bytes for broken implementations */
 452           memset(addr + addrLen, 0, *len - addrLen);
 453           *len = addrLen;
 454           *type = MIB_IF_TYPE_ETHERNET;
 455           ret = NO_ERROR;
 456         }
 457       }
 458     }
 459     close(fd);
 460   }
 461     else
 462       ret = ERROR_NO_MORE_FILES;
 463
 464   return ret;
 465 }
 466 #elif defined (HAVE_SYS_SYSCTL_H) && defined (HAVE_NET_IF_DL_H)
 467 static DWORD getInterfacePhysicalByName(const char *name, PDWORD len, PBYTE addr,
 468  PDWORD type)
 469 {
 470   DWORD ret;
 471   struct if_msghdr *ifm;
 472   struct sockaddr_dl *sdl;
 473   u_char *p, *buf;
 474   size_t mibLen;
 475   int mib[] = { CTL_NET, AF_ROUTE, 0, AF_LINK, NET_RT_IFLIST, 0 };
 476   unsigned addrLen;
 477   BOOL found = FALSE;
 478
 479   if (!name || !len || !addr || !type)
 480     return ERROR_INVALID_PARAMETER;
 481
 482   if (sysctl(mib, 6, NULL, &mibLen, NULL, 0) < 0)
 483     return ERROR_NO_MORE_FILES;
 484
 485   buf = HeapAlloc(GetProcessHeap(), 0, mibLen);
 486   if (!buf)
 487     return ERROR_NOT_ENOUGH_MEMORY;
 488
 489   if (sysctl(mib, 6, buf, &mibLen, NULL, 0) < 0) {
 490     HeapFree(GetProcessHeap(), 0, buf);
 491     return ERROR_NO_MORE_FILES;
 492   }
 493
 494   ret = ERROR_INVALID_DATA;
 495   for (p = buf; !found && p < buf + mibLen; p += ifm->ifm_msglen) {
 496     ifm = (struct if_msghdr *)p;
 497     sdl = (struct sockaddr_dl *)(ifm + 1);
 498
 499     if (ifm->ifm_type != RTM_IFINFO || (ifm->ifm_addrs & RTA_IFP) == 0)
 500       continue;
 501
 502     if (sdl->sdl_family != AF_LINK || sdl->sdl_nlen == 0 ||
 503      memcmp(sdl->sdl_data, name, max(sdl->sdl_nlen, strlen(name))) != 0)
 504       continue;
 505
 506     found = TRUE;
 507     addrLen = min(MAX_INTERFACE_PHYSADDR, sdl->sdl_alen);
 508     if (addrLen > *len) {
 509       ret = ERROR_INSUFFICIENT_BUFFER;
 510       *len = addrLen;
 511     }
 512     else {
 513       if (addrLen > 0)
 514         memcpy(addr, LLADDR(sdl), addrLen);
 515       /* zero out remaining bytes for broken implementations */
 516       memset(addr + addrLen, 0, *len - addrLen);
 517       *len = addrLen;
 518 #if defined(HAVE_NET_IF_TYPES_H)
 519       switch (sdl->sdl_type)
 520       {
 521         case IFT_ETHER:
 522           *type = MIB_IF_TYPE_ETHERNET;
 523           break;
 524         case IFT_FDDI:
 525           *type = MIB_IF_TYPE_FDDI;
 526           break;
 527         case IFT_ISO88024: /* Token Bus */
 528           *type = MIB_IF_TYPE_TOKENRING;
 529           break;
 530         case IFT_ISO88025: /* Token Ring */
 531           *type = MIB_IF_TYPE_TOKENRING;
 532           break;
 533         case IFT_PPP:
 534           *type = MIB_IF_TYPE_PPP;
 535           break;
 536         case IFT_SLIP:
 537           *type = MIB_IF_TYPE_SLIP;
 538           break;
 539         case IFT_LOOP:
 540           *type = MIB_IF_TYPE_LOOPBACK;
 541           break;
 542         default:
 543           *type = MIB_IF_TYPE_OTHER;
 544       }
 545 #else
 546       /* default if we don't know */
 547       *type = MIB_IF_TYPE_ETHERNET;
 548 #endif
 549       ret = NO_ERROR;
 550     }
 551   }
 552   HeapFree(GetProcessHeap(), 0, buf);
 553   return ret;
 554 }
 555 #endif
 556
 557 DWORD getInterfacePhysicalByIndex(DWORD index, PDWORD len, PBYTE addr,
 558  PDWORD type)
 559 {
 560   char nameBuf[IF_NAMESIZE];
 561   char *name = getInterfaceNameByIndex(index, nameBuf);
 562
 563   if (name)
 564     return getInterfacePhysicalByName(name, len, addr, type);
 565   else
 566     return ERROR_INVALID_DATA;
 567 }
 568
 569 DWORD getInterfaceMtuByName(const char *name, PDWORD mtu)
 570 {
 571   DWORD ret;
 572   int fd;
 573
 574   if (!name)
 575     return ERROR_INVALID_PARAMETER;
 576   if (!mtu)
 577     return ERROR_INVALID_PARAMETER;
 578
 579   fd = socket(PF_INET, SOCK_DGRAM, 0);
 580   if (fd != -1) {
 581     struct ifreq ifr;
 582
 583     lstrcpynA(ifr.ifr_name, name, IFNAMSIZ);
 584     if ((ioctl(fd, SIOCGIFMTU, &ifr)))
 585       ret = ERROR_INVALID_DATA;
 586     else {
 587 #ifndef __sun
 588       *mtu = ifr.ifr_mtu;
 589 #else
 590       *mtu = ifr.ifr_metric;
 591 #endif
 592       ret = NO_ERROR;
 593     }
 594     close(fd);
 595   }
 596   else
 597     ret = ERROR_NO_MORE_FILES;
 598   return ret;
 599 }
 600
 601 DWORD getInterfaceStatusByName(const char *name, PDWORD status)
 602 {
 603   DWORD ret;
 604   int fd;
 605
 606   if (!name)
 607     return ERROR_INVALID_PARAMETER;
 608   if (!status)
 609     return ERROR_INVALID_PARAMETER;
 610
 611   fd = socket(PF_INET, SOCK_DGRAM, 0);
 612   if (fd != -1) {
 613     struct ifreq ifr;
 614
 615     lstrcpynA(ifr.ifr_name, name, IFNAMSIZ);
 616     if ((ioctl(fd, SIOCGIFFLAGS, &ifr)))
 617       ret = ERROR_INVALID_DATA;
 618     else {
 619       if (ifr.ifr_flags & IFF_UP)
 620         *status = MIB_IF_OPER_STATUS_OPERATIONAL;
 621       else
 622         *status = MIB_IF_OPER_STATUS_NON_OPERATIONAL;
 623       ret = NO_ERROR;
 624     }
 625     close(fd);
 626   }
 627   else
 628     ret = ERROR_NO_MORE_FILES;
 629   return ret;
 630 }
 631
 632 DWORD getInterfaceEntryByName(const char *name, PMIB_IFROW entry)
 633 {
 634   BYTE addr[MAX_INTERFACE_PHYSADDR];
 635   DWORD ret, len = sizeof(addr), type;
 636
 637   if (!name)
 638     return ERROR_INVALID_PARAMETER;
 639   if (!entry)
 640     return ERROR_INVALID_PARAMETER;
 641
 642   if (getInterfacePhysicalByName(name, &len, addr, &type) == NO_ERROR) {
 643     WCHAR *assigner;
 644     const char *walker;
 645
 646     memset(entry, 0, sizeof(MIB_IFROW));
 647     for (assigner = entry->wszName, walker = name; *walker;
 648      walker++, assigner++)
 649       *assigner = *walker;
 650     *assigner = 0;
 651     getInterfaceIndexByName(name, &entry->dwIndex);
 652     entry->dwPhysAddrLen = len;
 653     memcpy(entry->bPhysAddr, addr, len);
 654     memset(entry->bPhysAddr + len, 0, sizeof(entry->bPhysAddr) - len);
 655     entry->dwType = type;
 656     /* FIXME: how to calculate real speed? */
 657     getInterfaceMtuByName(name, &entry->dwMtu);
 658     /* lie, there's no "administratively down" here */
 659     entry->dwAdminStatus = MIB_IF_ADMIN_STATUS_UP;
 660     getInterfaceStatusByName(name, &entry->dwOperStatus);
 661     /* punt on dwLastChange? */
 662     entry->dwDescrLen = min(strlen(name), MAX_INTERFACE_DESCRIPTION - 1);
 663     memcpy(entry->bDescr, name, entry->dwDescrLen);
 664     entry->bDescr[entry->dwDescrLen] = '\0';
 665     entry->dwDescrLen++;
 666     ret = NO_ERROR;
 667   }
 668   else
 669     ret = ERROR_INVALID_DATA;
 670   return ret;
 671 }
 672
 673 /* Enumerates the IP addresses in the system using SIOCGIFCONF, returning
 674  * the count to you in *pcAddresses.  It also returns to you the struct ifconf
 675  * used by the call to ioctl, so that you may process the addresses further.
 676  * Free ifc->ifc_buf using HeapFree.
 677  * Returns NO_ERROR on success, something else on failure.
 678  */
 679 static DWORD enumIPAddresses(PDWORD pcAddresses, struct ifconf *ifc)
 680 {
 681   DWORD ret;
 682   int fd;
 683
 684   fd = socket(PF_INET, SOCK_DGRAM, 0);
 685   if (fd != -1) {
 686     int ioctlRet = 0;
 687     DWORD guessedNumAddresses = 0, numAddresses = 0;
 688     caddr_t ifPtr;
 689     int lastlen;
 690
 691     ret = NO_ERROR;
 692     ifc->ifc_len = 0;
 693     ifc->ifc_buf = NULL;
 694     /* there is no way to know the interface count beforehand,
 695        so we need to loop again and again upping our max each time
 696        until returned is constant across 2 calls */
 697     do {
 698       lastlen = ifc->ifc_len;
 699       HeapFree(GetProcessHeap(), 0, ifc->ifc_buf);
 700       if (guessedNumAddresses == 0)
 701         guessedNumAddresses = INITIAL_INTERFACES_ASSUMED;
 702       else
 703         guessedNumAddresses *= 2;
 704       ifc->ifc_len = sizeof(struct ifreq) * guessedNumAddresses;
 705       ifc->ifc_buf = HeapAlloc(GetProcessHeap(), 0, ifc->ifc_len);
 706       ioctlRet = ioctl(fd, SIOCGIFCONF, ifc);
 707     } while ((ioctlRet == 0) && (ifc->ifc_len != lastlen));
 708
 709     if (ioctlRet == 0) {
 710       ifPtr = ifc->ifc_buf;
 711       while (ifPtr && ifPtr < ifc->ifc_buf + ifc->ifc_len) {
 712         struct ifreq *ifr = (struct ifreq *)ifPtr;
 713
 714         if (ifr->ifr_addr.sa_family == AF_INET)
 715           numAddresses++;
 716
 717         ifPtr += ifreq_len((struct ifreq *)ifPtr);
 718       }
 719     }
 720     else
 721       ret = ERROR_INVALID_PARAMETER; /* FIXME: map from errno to Win32 */
 722     if (!ret)
 723       *pcAddresses = numAddresses;
 724     else
 725     {
 726       HeapFree(GetProcessHeap(), 0, ifc->ifc_buf);
 727       ifc->ifc_buf = NULL;
 728     }
 729     close(fd);
 730   }
 731   else
 732     ret = ERROR_NO_SYSTEM_RESOURCES;
 733   return ret;
 734 }
 735
 736 DWORD getNumIPAddresses(void)
 737 {
 738   DWORD numAddresses = 0;
 739   struct ifconf ifc;
 740
 741   if (!enumIPAddresses(&numAddresses, &ifc))
 742     HeapFree(GetProcessHeap(), 0, ifc.ifc_buf);
 743   return numAddresses;
 744 }
 745
 746 DWORD getIPAddrTable(PMIB_IPADDRTABLE *ppIpAddrTable, HANDLE heap, DWORD flags)
 747 {
 748   DWORD ret;
 749
 750   if (!ppIpAddrTable)
 751     ret = ERROR_INVALID_PARAMETER;
 752   else
 753   {
 754     DWORD numAddresses = 0;
 755     struct ifconf ifc;
 756
 757     ret = enumIPAddresses(&numAddresses, &ifc);
 758     if (!ret)
 759     {
 760       DWORD size = sizeof(MIB_IPADDRTABLE);
 761
 762       if (numAddresses > 1)
 763         size += (numAddresses - 1) * sizeof(MIB_IPADDRROW);
 764       *ppIpAddrTable = HeapAlloc(heap, flags, size);
 765       if (*ppIpAddrTable) {
 766         DWORD i = 0, bcast;
 767         caddr_t ifPtr;
 768
 769         ret = NO_ERROR;
 770         (*ppIpAddrTable)->dwNumEntries = numAddresses;
 771         ifPtr = ifc.ifc_buf;
 772         while (!ret && ifPtr && ifPtr < ifc.ifc_buf + ifc.ifc_len) {
 773           struct ifreq *ifr = (struct ifreq *)ifPtr;
 774
 775           ifPtr += ifreq_len(ifr);
 776
 777           if (ifr->ifr_addr.sa_family != AF_INET)
 778              continue;
 779
 780           ret = getInterfaceIndexByName(ifr->ifr_name,
 781            &(*ppIpAddrTable)->table[i].dwIndex);
 782           memcpy(&(*ppIpAddrTable)->table[i].dwAddr, ifr->ifr_addr.sa_data + 2,
 783            sizeof(DWORD));
 784           (*ppIpAddrTable)->table[i].dwMask =
 785            getInterfaceMaskByName(ifr->ifr_name);
 786           /* the dwBCastAddr member isn't the broadcast address, it indicates
 787            * whether the interface uses the 1's broadcast address (1) or the
 788            * 0's broadcast address (0).
 789            */
 790           bcast = getInterfaceBCastAddrByName(ifr->ifr_name);
 791           (*ppIpAddrTable)->table[i].dwBCastAddr =
 792            (bcast & (*ppIpAddrTable)->table[i].dwMask) ? 1 : 0;
 793           /* FIXME: hardcoded reasm size, not sure where to get it */
 794           (*ppIpAddrTable)->table[i].dwReasmSize = 65535;
 795
 796           (*ppIpAddrTable)->table[i].unused1 = 0;
 797           (*ppIpAddrTable)->table[i].wType = 0;
 798           i++;
 799         }
 800       }
 801       else
 802         ret = ERROR_OUTOFMEMORY;
 803       HeapFree(GetProcessHeap(), 0, ifc.ifc_buf);
 804     }
 805   }
 806   return ret;
 807 }
 808
 809 #ifdef HAVE_IFADDRS_H
 810 ULONG v6addressesFromIndex(DWORD index, SOCKET_ADDRESS **addrs, ULONG *num_addrs)
 811 {
 812   struct ifaddrs *ifa;
 813   ULONG ret;
 814
 815   if (!getifaddrs(&ifa))
 816   {
 817     struct ifaddrs *p;
 818     ULONG n;
 819     char name[IFNAMSIZ];
 820
 821     getInterfaceNameByIndex(index, name);
 822     for (p = ifa, n = 0; p; p = p->ifa_next)
 823       if (p->ifa_addr && p->ifa_addr->sa_family == AF_INET6 &&
 824           !strcmp(name, p->ifa_name))
 825         n++;
 826     if (n)
 827     {
 828       *addrs = HeapAlloc(GetProcessHeap(), 0, n * (sizeof(SOCKET_ADDRESS) +
 829                          sizeof(struct WS_sockaddr_in6)));
 830       if (*addrs)
 831       {
 832         struct WS_sockaddr_in6 *next_addr = (struct WS_sockaddr_in6 *)(
 833             (BYTE *)*addrs + n * sizeof(SOCKET_ADDRESS));
 834
 835         for (p = ifa, n = 0; p; p = p->ifa_next)
 836         {
 837           if (p->ifa_addr && p->ifa_addr->sa_family == AF_INET6 &&
 838               !strcmp(name, p->ifa_name))
 839           {
 840             struct sockaddr_in6 *addr = (struct sockaddr_in6 *)p->ifa_addr;
 841
 842             next_addr->sin6_family = WS_AF_INET6;
 843             next_addr->sin6_port = addr->sin6_port;
 844             next_addr->sin6_flowinfo = addr->sin6_flowinfo;
 845             memcpy(&next_addr->sin6_addr, &addr->sin6_addr,
 846              sizeof(next_addr->sin6_addr));
 847             next_addr->sin6_scope_id = addr->sin6_scope_id;
 848             (*addrs)[n].lpSockaddr = (LPSOCKADDR)next_addr;
 849             (*addrs)[n].iSockaddrLength = sizeof(struct WS_sockaddr_in6);
 850             next_addr++;
 851             n++;
 852           }
 853         }
 854         *num_addrs = n;
 855         ret = ERROR_SUCCESS;
 856       }
 857       else
 858         ret = ERROR_OUTOFMEMORY;
 859     }
 860     else
 861     {
 862       *addrs = NULL;
 863       *num_addrs = 0;
 864       ret = ERROR_SUCCESS;
 865     }
 866     freeifaddrs(ifa);
 867   }
 868   else
 869     ret = ERROR_NO_DATA;
 870   return ret;
 871 }
 872 #else
 873 ULONG v6addressesFromIndex(DWORD index, SOCKET_ADDRESS **addrs, ULONG *num_addrs)
 874 {
 875   *addrs = NULL;
 876   *num_addrs = 0;
 877   return ERROR_SUCCESS;
 878 }
 879 #endif
 880
 881 char *toIPAddressString(unsigned int addr, char string[16])
 882 {
 883   if (string) {
 884     struct in_addr iAddr;
 885
 886     iAddr.s_addr = addr;
 887     /* extra-anal, just to make auditors happy */
 888     lstrcpynA(string, inet_ntoa(iAddr), 16);
 889   }
 890   return string;
 891 }