source3/nmbd/nmbd_namelistdb.c

   1 /*
   2    Unix SMB/CIFS implementation.
   3    NBT netbios routines and daemon - version 2
   4    Copyright (C) Andrew Tridgell 1994-1998
   5    Copyright (C) Luke Kenneth Casson Leighton 1994-1998
   6    Copyright (C) Jeremy Allison 1994-2003
   7
   8    This program is free software; you can redistribute it and/or modify
   9    it under the terms of the GNU General Public License as published by
  10    the Free Software Foundation; either version 3 of the License, or
  11    (at your option) any later version.
  12
  13    This program is distributed in the hope that it will be useful,
  14    but WITHOUT ANY WARRANTY; without even the implied warranty of
  15    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  16    GNU General Public License for more details.
  17
  18    You should have received a copy of the GNU General Public License
  19    along with this program.  If not, see <http://www.gnu.org/licenses/>.
  20
  21 */
  22
  23 #include "includes.h"
  24 #include "system/filesys.h"
  25 #include "nmbd/nmbd.h"
  26
  27 uint16_t samba_nb_type = 0; /* samba's NetBIOS name type */
  28
  29
  30 /**************************************************************************
  31  Set Samba's NetBIOS name type.
  32 ***************************************************************************/
  33
  34 void set_samba_nb_type(void)
  35 {
  36         if( lp_we_are_a_wins_server() || wins_srv_count() ) {
  37                 samba_nb_type = NB_HFLAG;               /* samba is a 'hybrid' node type. */
  38         } else {
  39                 samba_nb_type = NB_BFLAG;           /* samba is broadcast-only node type. */
  40         }
  41 }
  42
  43 /***************************************************************************
  44  Convert a NetBIOS name to upper case.
  45 ***************************************************************************/
  46
  47 static bool upcase_name( struct nmb_name *target, const struct nmb_name *source )
  48 {
  49         int i;
  50         unstring targ;
  51         fstring scope;
  52
  53         if( NULL != source ) {
  54                 memcpy( target, source, sizeof( struct nmb_name ) );
  55         }
  56
  57         pull_ascii_nstring(targ, sizeof(targ), target->name);
  58         if (!strupper_m( targ )) {
  59                 return false;
  60         }
  61         push_ascii_nstring( target->name, targ);
  62
  63         pull_ascii(scope, target->scope, 64, -1, STR_TERMINATE);
  64         if (!strupper_m( scope )) {
  65                 return false;
  66         }
  67         push_ascii(target->scope, scope, 64, STR_TERMINATE);
  68
  69         /* fudge... We're using a byte-by-byte compare, so we must be sure that
  70          * unused space doesn't have garbage in it.
  71          */
  72
  73         for( i = strlen( target->name ); i < sizeof( target->name ); i++ ) {
  74                 target->name[i] = '\0';
  75         }
  76         for( i = strlen( target->scope ); i < sizeof( target->scope ); i++ ) {
  77                 target->scope[i] = '\0';
  78         }
  79         return true;
  80 }
  81
  82 /**************************************************************************
  83  Remove a name from the namelist.
  84 ***************************************************************************/
  85
  86 void remove_name_from_namelist(struct subnet_record *subrec,
  87                                 struct name_record *namerec )
  88 {
  89         if (subrec == wins_server_subnet)
  90                 remove_name_from_wins_namelist(namerec);
  91         else {
  92                 subrec->namelist_changed = True;
  93                 DLIST_REMOVE(subrec->namelist, namerec);
  94         }
  95
  96         SAFE_FREE(namerec->data.ip);
  97         ZERO_STRUCTP(namerec);
  98         SAFE_FREE(namerec);
  99 }
 100
 101 /**************************************************************************
 102  Find a name in a subnet.
 103 **************************************************************************/
 104
 105 struct name_record *find_name_on_subnet(struct subnet_record *subrec,
 106                                 const struct nmb_name *nmbname,
 107                                 bool self_only)
 108 {
 109         struct nmb_name uc_name;
 110         struct name_record *name_ret;
 111
 112         if (!upcase_name( &uc_name, nmbname )) {
 113                 return NULL;
 114         }
 115
 116         if (subrec == wins_server_subnet) {
 117                 return find_name_on_wins_subnet(&uc_name, self_only);
 118         }
 119
 120         for( name_ret = subrec->namelist; name_ret; name_ret = name_ret->next) {
 121                 if (memcmp(&uc_name, &name_ret->name, sizeof(struct nmb_name)) == 0) {
 122                         break;
 123                 }
 124         }
 125
 126         if( name_ret ) {
 127                 /* Self names only - these include permanent names. */
 128                 if( self_only && (name_ret->data.source != SELF_NAME) && (name_ret->data.source != PERMANENT_NAME) ) {
 129                         DEBUG( 9, ( "find_name_on_subnet: on subnet %s - self name %s NOT FOUND\n",
 130                                                 subrec->subnet_name, nmb_namestr(nmbname) ) );
 131                         return NULL;
 132                 }
 133
 134                 DEBUG( 9, ("find_name_on_subnet: on subnet %s - found name %s source=%d\n",
 135                         subrec->subnet_name, nmb_namestr(nmbname), name_ret->data.source) );
 136
 137                 return name_ret;
 138         }
 139
 140         DEBUG( 9, ( "find_name_on_subnet: on subnet %s - name %s NOT FOUND\n",
 141                 subrec->subnet_name, nmb_namestr(nmbname) ) );
 142
 143         return NULL;
 144 }
 145
 146 /**************************************************************************
 147  Find a name over all known broadcast subnets.
 148 ************************************************************************/
 149
 150 struct name_record *find_name_for_remote_broadcast_subnet(struct nmb_name *nmbname,
 151                                                 bool self_only)
 152 {
 153         struct subnet_record *subrec;
 154         struct name_record *namerec;
 155
 156         for( subrec = FIRST_SUBNET; subrec; subrec = NEXT_SUBNET_EXCLUDING_UNICAST(subrec) ) {
 157                 namerec = find_name_on_subnet(subrec, nmbname, self_only);
 158                 if (namerec) {
 159                         return namerec;
 160                 }
 161         }
 162
 163         return NULL;
 164 }
 165
 166 /**************************************************************************
 167  Update the ttl of an entry in a subnet name list.
 168 ***************************************************************************/
 169
 170 void update_name_ttl( struct name_record *namerec, int ttl )
 171 {
 172         time_t time_now = time(NULL);
 173
 174         if( namerec->data.death_time != PERMANENT_TTL) {
 175                 namerec->data.death_time = time_now + ttl;
 176         }
 177
 178         namerec->data.refresh_time = time_now + MIN((ttl/2), MAX_REFRESH_TIME);
 179
 180         if (namerec->subnet == wins_server_subnet) {
 181                 wins_store_changed_namerec(namerec);
 182         } else {
 183                 namerec->subnet->namelist_changed = True;
 184         }
 185 }
 186
 187 /**************************************************************************
 188  Add an entry to a subnet name list.
 189 ***********************************************************************/
 190
 191 bool add_name_to_subnet( struct subnet_record *subrec,
 192                         const char *name,
 193                         int type,
 194                         uint16_t nb_flags,
 195                         int ttl,
 196                         enum name_source source,
 197                         int num_ips,
 198                         struct in_addr *iplist)
 199 {
 200         bool ret = False;
 201         struct name_record *namerec;
 202         time_t time_now = time(NULL);
 203
 204         if (num_ips == 0) {
 205                 return false;
 206         }
 207
 208         namerec = SMB_MALLOC_P(struct name_record);
 209         if( NULL == namerec ) {
 210                 DEBUG( 0, ( "add_name_to_subnet: malloc fail.\n" ) );
 211                 return False;
 212         }
 213
 214         memset( (char *)namerec, '\0', sizeof(*namerec) );
 215         namerec->data.ip = SMB_MALLOC_ARRAY( struct in_addr, num_ips );
 216         if( NULL == namerec->data.ip ) {
 217                 DEBUG( 0, ( "add_name_to_subnet: malloc fail when creating ip_flgs.\n" ) );
 218                 ZERO_STRUCTP(namerec);
 219                 SAFE_FREE(namerec);
 220                 return False;
 221         }
 222
 223         namerec->subnet = subrec;
 224
 225         make_nmb_name(&namerec->name, name, type);
 226         if (!upcase_name(&namerec->name, NULL )) {
 227                 SAFE_FREE(namerec->data.ip);
 228                 SAFE_FREE(namerec);
 229                 return False;
 230         }
 231
 232         /* Enter the name as active. */
 233         namerec->data.nb_flags = nb_flags | NB_ACTIVE;
 234         namerec->data.wins_flags = WINS_ACTIVE;
 235
 236         /* If it's our primary name, flag it as so. */
 237         if (strequal( my_netbios_names(0), name )) {
 238                 namerec->data.nb_flags |= NB_PERM;
 239         }
 240
 241         /* Copy the IPs. */
 242         namerec->data.num_ips = num_ips;
 243         memcpy( (namerec->data.ip), iplist, num_ips * sizeof(struct in_addr) );
 244
 245         /* Data source. */
 246         namerec->data.source = source;
 247
 248         /* Setup the death_time and refresh_time. */
 249         if (ttl == PERMANENT_TTL) {
 250                 namerec->data.death_time = PERMANENT_TTL;
 251         } else {
 252                 namerec->data.death_time = time_now + ttl;
 253         }
 254
 255         namerec->data.refresh_time = time_now + MIN((ttl/2), MAX_REFRESH_TIME);
 256
 257         DEBUG( 3, ( "add_name_to_subnet: Added netbios name %s with first IP %s \
 258 ttl=%d nb_flags=%2x to subnet %s\n",
 259                 nmb_namestr( &namerec->name ),
 260                 inet_ntoa( *iplist ),
 261                 ttl,
 262                 (unsigned int)nb_flags,
 263                 subrec->subnet_name ) );
 264
 265         /* Now add the record to the name list. */
 266
 267         if (subrec == wins_server_subnet) {
 268                 ret = add_name_to_wins_subnet(namerec);
 269                 /* Free namerec - it's stored in the tdb. */
 270                 SAFE_FREE(namerec->data.ip);
 271                 SAFE_FREE(namerec);
 272         } else {
 273                 DLIST_ADD(subrec->namelist, namerec);
 274                 subrec->namelist_changed = True;
 275                 ret = True;
 276         }
 277
 278         return ret;
 279 }
 280
 281 /*******************************************************************
 282  Utility function automatically called when a name refresh or register
 283  succeeds. By definition this is a SELF_NAME (or we wouldn't be registering
 284  it).
 285  ******************************************************************/
 286
 287 void standard_success_register(struct subnet_record *subrec,
 288                              struct userdata_struct *userdata,
 289                              struct nmb_name *nmbname, uint16_t nb_flags, int ttl,
 290                              struct in_addr registered_ip)
 291 {
 292         struct name_record *namerec;
 293
 294         namerec = find_name_on_subnet( subrec, nmbname, FIND_SELF_NAME);
 295         if (namerec == NULL) {
 296                 unstring name;
 297                 pull_ascii_nstring(name, sizeof(name), nmbname->name);
 298                 add_name_to_subnet( subrec, name, nmbname->name_type,
 299                         nb_flags, ttl, SELF_NAME, 1, &registered_ip );
 300         } else {
 301                 update_name_ttl( namerec, ttl );
 302         }
 303 }
 304
 305 /*******************************************************************
 306  Utility function automatically called when a name refresh or register
 307  fails. Note that this is only ever called on a broadcast subnet with
 308  one IP address per name. This is why it can just delete the name
 309  without enumerating the IP adresses. JRA.
 310  ******************************************************************/
 311
 312 void standard_fail_register( struct subnet_record   *subrec,
 313                              struct nmb_name        *nmbname )
 314 {
 315         struct name_record *namerec;
 316
 317         namerec = find_name_on_subnet( subrec, nmbname, FIND_SELF_NAME);
 318
 319         DEBUG( 0, ( "standard_fail_register: Failed to register/refresh name %s \
 320 on subnet %s\n", nmb_namestr(nmbname), subrec->subnet_name) );
 321
 322         /* Remove the name from the subnet. */
 323         if( namerec ) {
 324                 remove_name_from_namelist(subrec, namerec);
 325         }
 326 }
 327
 328 /*******************************************************************
 329  Utility function to remove an IP address from a name record.
 330  ******************************************************************/
 331
 332 static void remove_nth_ip_in_record( struct name_record *namerec, int ind)
 333 {
 334         if( ind != namerec->data.num_ips ) {
 335                 memmove( (char *)(&namerec->data.ip[ind]),
 336                                 (char *)(&namerec->data.ip[ind+1]),
 337                                 ( namerec->data.num_ips - ind - 1) * sizeof(struct in_addr) );
 338         }
 339
 340         namerec->data.num_ips--;
 341         if (namerec->subnet == wins_server_subnet) {
 342                 wins_store_changed_namerec(namerec);
 343         } else {
 344                 namerec->subnet->namelist_changed = True;
 345         }
 346 }
 347
 348 /*******************************************************************
 349  Utility function to check if an IP address exists in a name record.
 350  ******************************************************************/
 351
 352 bool find_ip_in_name_record( struct name_record *namerec, struct in_addr ip )
 353 {
 354         int i;
 355
 356         for(i = 0; i < namerec->data.num_ips; i++) {
 357                 if(ip_equal_v4( namerec->data.ip[i], ip)) {
 358                         return True;
 359                 }
 360         }
 361
 362         return False;
 363 }
 364
 365 /*******************************************************************
 366  Utility function to add an IP address to a name record.
 367  ******************************************************************/
 368
 369 void add_ip_to_name_record( struct name_record *namerec, struct in_addr new_ip )
 370 {
 371         struct in_addr *new_list;
 372
 373         /* Don't add one we already have. */
 374         if( find_ip_in_name_record( namerec, new_ip )) {
 375                 return;
 376         }
 377
 378         new_list = SMB_MALLOC_ARRAY( struct in_addr, namerec->data.num_ips + 1);
 379         if( NULL == new_list ) {
 380                 DEBUG(0,("add_ip_to_name_record: Malloc fail !\n"));
 381                 return;
 382         }
 383
 384         memcpy( (char *)new_list, (char *)namerec->data.ip, namerec->data.num_ips * sizeof(struct in_addr) );
 385         new_list[namerec->data.num_ips] = new_ip;
 386
 387         SAFE_FREE(namerec->data.ip);
 388         namerec->data.ip = new_list;
 389         namerec->data.num_ips += 1;
 390
 391         if (namerec->subnet == wins_server_subnet) {
 392                 wins_store_changed_namerec(namerec);
 393         } else {
 394                 namerec->subnet->namelist_changed = True;
 395         }
 396 }
 397
 398 /*******************************************************************
 399  Utility function to remove an IP address from a name record.
 400  ******************************************************************/
 401
 402 void remove_ip_from_name_record( struct name_record *namerec,
 403                                  struct in_addr      remove_ip )
 404 {
 405         /* Try and find the requested ip address - remove it. */
 406         int i;
 407         int orig_num = namerec->data.num_ips;
 408
 409         for(i = 0; i < orig_num; i++) {
 410                 if( ip_equal_v4( remove_ip, namerec->data.ip[i]) ) {
 411                         remove_nth_ip_in_record( namerec, i);
 412                         break;
 413                 }
 414         }
 415 }
 416
 417 /*******************************************************************
 418  Utility function that release_name callers can plug into as the
 419  success function when a name release is successful. Used to save
 420  duplication of success_function code.
 421  ******************************************************************/
 422
 423 void standard_success_release( struct subnet_record   *subrec,
 424                                struct userdata_struct *userdata,
 425                                struct nmb_name        *nmbname,
 426                                struct in_addr          released_ip )
 427 {
 428         struct name_record *namerec;
 429
 430         namerec = find_name_on_subnet( subrec, nmbname, FIND_ANY_NAME );
 431         if( namerec == NULL ) {
 432                 DEBUG( 0, ( "standard_success_release: Name release for name %s IP %s \
 433 on subnet %s. Name was not found on subnet.\n", nmb_namestr(nmbname), inet_ntoa(released_ip),
 434                                 subrec->subnet_name) );
 435                 return;
 436         } else {
 437                 int orig_num = namerec->data.num_ips;
 438
 439                 remove_ip_from_name_record( namerec, released_ip );
 440
 441                 if( namerec->data.num_ips == orig_num ) {
 442                         DEBUG( 0, ( "standard_success_release: Name release for name %s IP %s \
 443 on subnet %s. This ip is not known for this name.\n", nmb_namestr(nmbname), inet_ntoa(released_ip), subrec->subnet_name ) );
 444                 }
 445         }
 446
 447         if( namerec->data.num_ips == 0 ) {
 448                 remove_name_from_namelist( subrec, namerec );
 449         }
 450 }
 451
 452 /*******************************************************************
 453  Expires old names in a subnet namelist.
 454  NB. Does not touch the wins_subnet - no wins specific processing here.
 455 ******************************************************************/
 456
 457 static void expire_names_on_subnet(struct subnet_record *subrec, time_t t)
 458 {
 459         struct name_record *namerec;
 460         struct name_record *next_namerec;
 461
 462         for( namerec = subrec->namelist; namerec; namerec = next_namerec ) {
 463                 next_namerec = namerec->next;
 464                 if( (namerec->data.death_time != PERMANENT_TTL) && (namerec->data.death_time < t) ) {
 465                         if( namerec->data.source == SELF_NAME ) {
 466                                 DEBUG( 3, ( "expire_names_on_subnet: Subnet %s not expiring SELF \
 467 name %s\n", subrec->subnet_name, nmb_namestr(&namerec->name) ) );
 468                                 namerec->data.death_time += 300;
 469                                 namerec->subnet->namelist_changed = True;
 470                                 continue;
 471                         }
 472
 473                         DEBUG(3,("expire_names_on_subnet: Subnet %s - removing expired name %s\n",
 474                                 subrec->subnet_name, nmb_namestr(&namerec->name)));
 475
 476                         remove_name_from_namelist(subrec, namerec );
 477                 }
 478         }
 479 }
 480
 481 /*******************************************************************
 482  Expires old names in all subnet namelists.
 483  NB. Does not touch the wins_subnet.
 484 ******************************************************************/
 485
 486 void expire_names(time_t t)
 487 {
 488         struct subnet_record *subrec;
 489
 490         for( subrec = FIRST_SUBNET; subrec; subrec = NEXT_SUBNET_INCLUDING_UNICAST(subrec) ) {
 491                 expire_names_on_subnet( subrec, t );
 492         }
 493 }
 494
 495 /****************************************************************************
 496   Add the magic samba names, useful for finding samba servers.
 497   These go directly into the name list for a particular subnet,
 498   without going through the normal registration process.
 499   When adding them to the unicast subnet, add them as a list of
 500   all broadcast subnet IP addresses.
 501 **************************************************************************/
 502
 503 void add_samba_names_to_subnet( struct subnet_record *subrec )
 504 {
 505         struct in_addr *iplist = &subrec->myip;
 506         int num_ips = 1;
 507
 508         /* These names are added permanently (ttl of zero) and will NOT be refreshed.  */
 509
 510         if( (subrec == unicast_subnet) || (subrec == wins_server_subnet) || (subrec == remote_broadcast_subnet) ) {
 511                 struct subnet_record *bcast_subrecs;
 512                 int i;
 513
 514                 /* Create an IP list containing all our known subnets. */
 515
 516                 num_ips = iface_count();
 517                 iplist = SMB_MALLOC_ARRAY( struct in_addr, num_ips);
 518                 if( NULL == iplist ) {
 519                         DEBUG(0,("add_samba_names_to_subnet: Malloc fail !\n"));
 520                         return;
 521                 }
 522
 523                 for( bcast_subrecs = FIRST_SUBNET, i = 0; bcast_subrecs &&
 524                                 i < num_ips;
 525                                 bcast_subrecs = NEXT_SUBNET_EXCLUDING_UNICAST(bcast_subrecs), i++ ) {
 526                         iplist[i] = bcast_subrecs->myip;
 527                 }
 528                 num_ips = i;
 529         }
 530
 531         add_name_to_subnet(subrec,"*",0x0,samba_nb_type, PERMANENT_TTL,
 532                                 PERMANENT_NAME, num_ips, iplist);
 533         add_name_to_subnet(subrec,"*",0x20,samba_nb_type,PERMANENT_TTL,
 534                                 PERMANENT_NAME, num_ips, iplist);
 535         add_name_to_subnet(subrec,"__SAMBA__",0x20,samba_nb_type,PERMANENT_TTL,
 536                                 PERMANENT_NAME, num_ips, iplist);
 537         add_name_to_subnet(subrec,"__SAMBA__",0x00,samba_nb_type,PERMANENT_TTL,
 538                                 PERMANENT_NAME, num_ips, iplist);
 539
 540         if(iplist != &subrec->myip) {
 541                 SAFE_FREE(iplist);
 542         }
 543 }
 544
 545 /****************************************************************************
 546  Dump a name_record struct.
 547 **************************************************************************/
 548
 549 void dump_name_record( struct name_record *namerec, FILE *fp)
 550 {
 551         const char *src_type;
 552         struct tm *tm;
 553         int i;
 554
 555         fprintf(fp,"\tName = %s\t", nmb_namestr(&namerec->name));
 556         switch(namerec->data.source) {
 557                 case LMHOSTS_NAME:
 558                         src_type = "LMHOSTS_NAME";
 559                         break;
 560                 case WINS_PROXY_NAME:
 561                         src_type = "WINS_PROXY_NAME";
 562                         break;
 563                 case REGISTER_NAME:
 564                         src_type = "REGISTER_NAME";
 565                         break;
 566                 case SELF_NAME:
 567                         src_type = "SELF_NAME";
 568                         break;
 569                 case DNS_NAME:
 570                         src_type = "DNS_NAME";
 571                         break;
 572                 case DNSFAIL_NAME:
 573                         src_type = "DNSFAIL_NAME";
 574                         break;
 575                 case PERMANENT_NAME:
 576                         src_type = "PERMANENT_NAME";
 577                         break;
 578                 default:
 579                         src_type = "unknown!";
 580                         break;
 581         }
 582
 583         fprintf(fp, "Source = %s\nb_flags = %x\t", src_type,
 584                 namerec->data.nb_flags);
 585
 586         if(namerec->data.death_time != PERMANENT_TTL) {
 587                 const char *asct;
 588                 tm = localtime(&namerec->data.death_time);
 589                 if (!tm) {
 590                         return;
 591                 }
 592                 asct = asctime(tm);
 593                 if (!asct) {
 594                         return;
 595                 }
 596                 fprintf(fp, "death_time = %s\t", asct);
 597         } else {
 598                 fprintf(fp, "death_time = PERMANENT\t");
 599         }
 600
 601         if(namerec->data.refresh_time != PERMANENT_TTL) {
 602                 const char *asct;
 603                 tm = localtime(&namerec->data.refresh_time);
 604                 if (!tm) {
 605                         return;
 606                 }
 607                 asct = asctime(tm);
 608                 if (!asct) {
 609                         return;
 610                 }
 611                 fprintf(fp, "refresh_time = %s\n", asct);
 612         } else {
 613                 fprintf(fp, "refresh_time = PERMANENT\n");
 614         }
 615
 616         fprintf(fp, "\t\tnumber of IPS = %d", namerec->data.num_ips);
 617         for(i = 0; i < namerec->data.num_ips; i++) {
 618                 fprintf(fp, "\t%s", inet_ntoa(namerec->data.ip[i]));
 619         }
 620
 621         fprintf(fp, "\n\n");
 622 }
 623
 624 /****************************************************************************
 625  Dump the contents of the namelists on all the subnets (including unicast)
 626  into a file. Initiated by SIGHUP - used to debug the state of the namelists.
 627 **************************************************************************/
 628
 629 static void dump_subnet_namelist(struct subnet_record *subrec, FILE *fp)
 630 {
 631         struct name_record *namerec;
 632         fprintf(fp, "Subnet %s\n----------------------\n", subrec->subnet_name);
 633         for( namerec = subrec->namelist; namerec; namerec = namerec->next) {
 634                 dump_name_record(namerec, fp);
 635         }
 636 }
 637
 638 /****************************************************************************
 639  Dump the contents of the namelists on all the subnets (including unicast)
 640  into a file. Initiated by SIGHUP - used to debug the state of the namelists.
 641 **************************************************************************/
 642
 643 void dump_all_namelists(void)
 644 {
 645         int fd;
 646         FILE *fp;
 647         struct subnet_record *subrec;
 648         char *dump_path;
 649
 650         dump_path = lock_path(talloc_tos(), "namelist.debug");
 651         if (dump_path == NULL) {
 652                 DEBUG(0, ("out of memory!\n"));
 653                 return;
 654         }
 655
 656         fd = open(dump_path, O_WRONLY | O_CREAT | O_TRUNC, 0644);
 657         if (fd == -1) {
 658                 DBG_ERR("Can't open file %s: %s\n", dump_path,
 659                         strerror(errno));
 660                 return;
 661         }
 662         TALLOC_FREE(dump_path);
 663
 664         fp = fdopen(fd, "w");
 665         if (!fp) {
 666                 DBG_ERR("fdopen failed: %s\n", strerror(errno));
 667                 close(fd);
 668                 return;
 669         }
 670         fd = -1;
 671
 672         for (subrec = FIRST_SUBNET; subrec; subrec = NEXT_SUBNET_INCLUDING_UNICAST(subrec)) {
 673                 dump_subnet_namelist( subrec, fp );
 674         }
 675
 676         if (!we_are_a_wins_client()) {
 677                 dump_subnet_namelist( unicast_subnet, fp );
 678         }
 679
 680         if (remote_broadcast_subnet->namelist != NULL) {
 681                 dump_subnet_namelist( remote_broadcast_subnet, fp );
 682         }
 683
 684         if (wins_server_subnet != NULL) {
 685                 dump_wins_subnet_namelist(fp );
 686         }
 687
 688         fclose( fp );
 689 }