source/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
  25 uint16 samba_nb_type = 0; /* samba's NetBIOS name type */
  26
  27
  28 /**************************************************************************
  29  Set Samba's NetBIOS name type.
  30 ***************************************************************************/
  31
  32 void set_samba_nb_type(void)
  33 {
  34         if( lp_wins_support() || wins_srv_count() ) {
  35                 samba_nb_type = NB_HFLAG;               /* samba is a 'hybrid' node type. */
  36         } else {
  37                 samba_nb_type = NB_BFLAG;           /* samba is broadcast-only node type. */
  38         }
  39 }
  40
  41 /***************************************************************************
  42  Convert a NetBIOS name to upper case.
  43 ***************************************************************************/
  44
  45 static void upcase_name( struct nmb_name *target, const struct nmb_name *source )
  46 {
  47         int i;
  48         unstring targ;
  49         fstring scope;
  50
  51         if( NULL != source ) {
  52                 memcpy( target, source, sizeof( struct nmb_name ) );
  53         }
  54
  55         pull_ascii_nstring(targ, sizeof(targ), target->name);
  56         strupper_m( targ );
  57         push_ascii_nstring( target->name, targ);
  58
  59         pull_ascii(scope, target->scope, 64, -1, STR_TERMINATE);
  60         strupper_m( scope );
  61         push_ascii(target->scope, scope, 64, STR_TERMINATE);
  62
  63         /* fudge... We're using a byte-by-byte compare, so we must be sure that
  64          * unused space doesn't have garbage in it.
  65          */
  66
  67         for( i = strlen( target->name ); i < sizeof( target->name ); i++ ) {
  68                 target->name[i] = '\0';
  69         }
  70         for( i = strlen( target->scope ); i < sizeof( target->scope ); i++ ) {
  71                 target->scope[i] = '\0';
  72         }
  73 }
  74
  75 /**************************************************************************
  76  Remove a name from the namelist.
  77 ***************************************************************************/
  78
  79 void remove_name_from_namelist(struct subnet_record *subrec,
  80                                 struct name_record *namerec )
  81 {
  82         if (subrec == wins_server_subnet)
  83                 remove_name_from_wins_namelist(namerec);
  84         else {
  85                 subrec->namelist_changed = True;
  86                 DLIST_REMOVE(subrec->namelist, namerec);
  87         }
  88
  89         SAFE_FREE(namerec->data.ip);
  90         ZERO_STRUCTP(namerec);
  91         SAFE_FREE(namerec);
  92 }
  93
  94 /**************************************************************************
  95  Find a name in a subnet.
  96 **************************************************************************/
  97
  98 struct name_record *find_name_on_subnet(struct subnet_record *subrec,
  99                                 const struct nmb_name *nmbname,
 100                                 bool self_only)
 101 {
 102         struct nmb_name uc_name;
 103         struct name_record *name_ret;
 104
 105         upcase_name( &uc_name, nmbname );
 106
 107         if (subrec == wins_server_subnet) {
 108                 return find_name_on_wins_subnet(&uc_name, self_only);
 109         }
 110
 111         for( name_ret = subrec->namelist; name_ret; name_ret = name_ret->next) {
 112                 if (memcmp(&uc_name, &name_ret->name, sizeof(struct nmb_name)) == 0) {
 113                         break;
 114                 }
 115         }
 116
 117         if( name_ret ) {
 118                 /* Self names only - these include permanent names. */
 119                 if( self_only && (name_ret->data.source != SELF_NAME) && (name_ret->data.source != PERMANENT_NAME) ) {
 120                         DEBUG( 9, ( "find_name_on_subnet: on subnet %s - self name %s NOT FOUND\n",
 121                                                 subrec->subnet_name, nmb_namestr(nmbname) ) );
 122                         return NULL;
 123                 }
 124
 125                 DEBUG( 9, ("find_name_on_subnet: on subnet %s - found name %s source=%d\n",
 126                         subrec->subnet_name, nmb_namestr(nmbname), name_ret->data.source) );
 127
 128                 return name_ret;
 129         }
 130
 131         DEBUG( 9, ( "find_name_on_subnet: on subnet %s - name %s NOT FOUND\n",
 132                 subrec->subnet_name, nmb_namestr(nmbname) ) );
 133
 134         return NULL;
 135 }
 136
 137 /**************************************************************************
 138  Find a name over all known broadcast subnets.
 139 ************************************************************************/
 140
 141 struct name_record *find_name_for_remote_broadcast_subnet(struct nmb_name *nmbname,
 142                                                 bool self_only)
 143 {
 144         struct subnet_record *subrec;
 145         struct name_record *namerec;
 146
 147         for( subrec = FIRST_SUBNET; subrec; subrec = NEXT_SUBNET_EXCLUDING_UNICAST(subrec) ) {
 148                 namerec = find_name_on_subnet(subrec, nmbname, self_only);
 149                 if (namerec) {
 150                         return namerec;
 151                 }
 152         }
 153
 154         return NULL;
 155 }
 156
 157 /**************************************************************************
 158  Update the ttl of an entry in a subnet name list.
 159 ***************************************************************************/
 160
 161 void update_name_ttl( struct name_record *namerec, int ttl )
 162 {
 163         time_t time_now = time(NULL);
 164
 165         if( namerec->data.death_time != PERMANENT_TTL) {
 166                 namerec->data.death_time = time_now + ttl;
 167         }
 168
 169         namerec->data.refresh_time = time_now + MIN((ttl/2), MAX_REFRESH_TIME);
 170
 171         if (namerec->subnet == wins_server_subnet) {
 172                 wins_store_changed_namerec(namerec);
 173         } else {
 174                 namerec->subnet->namelist_changed = True;
 175         }
 176 }
 177
 178 /**************************************************************************
 179  Add an entry to a subnet name list.
 180 ***********************************************************************/
 181
 182 bool add_name_to_subnet( struct subnet_record *subrec,
 183                         const char *name,
 184                         int type,
 185                         uint16 nb_flags,
 186                         int ttl,
 187                         enum name_source source,
 188                         int num_ips,
 189                         struct in_addr *iplist)
 190 {
 191         bool ret = False;
 192         struct name_record *namerec;
 193         time_t time_now = time(NULL);
 194
 195         if (num_ips == 0) {
 196                 return false;
 197         }
 198
 199         namerec = SMB_MALLOC_P(struct name_record);
 200         if( NULL == namerec ) {
 201                 DEBUG( 0, ( "add_name_to_subnet: malloc fail.\n" ) );
 202                 return False;
 203         }
 204
 205         memset( (char *)namerec, '\0', sizeof(*namerec) );
 206         namerec->data.ip = SMB_MALLOC_ARRAY( struct in_addr, num_ips );
 207         if( NULL == namerec->data.ip ) {
 208                 DEBUG( 0, ( "add_name_to_subnet: malloc fail when creating ip_flgs.\n" ) );
 209                 ZERO_STRUCTP(namerec);
 210                 SAFE_FREE(namerec);
 211                 return False;
 212         }
 213
 214         namerec->subnet = subrec;
 215
 216         make_nmb_name(&namerec->name, name, type);
 217         upcase_name(&namerec->name, NULL );
 218
 219         /* Enter the name as active. */
 220         namerec->data.nb_flags = nb_flags | NB_ACTIVE;
 221         namerec->data.wins_flags = WINS_ACTIVE;
 222
 223         /* If it's our primary name, flag it as so. */
 224         if (strequal( my_netbios_names(0), name )) {
 225                 namerec->data.nb_flags |= NB_PERM;
 226         }
 227
 228         /* Copy the IPs. */
 229         namerec->data.num_ips = num_ips;
 230         memcpy( (namerec->data.ip), iplist, num_ips * sizeof(struct in_addr) );
 231
 232         /* Data source. */
 233         namerec->data.source = source;
 234
 235         /* Setup the death_time and refresh_time. */
 236         if (ttl == PERMANENT_TTL) {
 237                 namerec->data.death_time = PERMANENT_TTL;
 238         } else {
 239                 namerec->data.death_time = time_now + ttl;
 240         }
 241
 242         namerec->data.refresh_time = time_now + MIN((ttl/2), MAX_REFRESH_TIME);
 243
 244         DEBUG( 3, ( "add_name_to_subnet: Added netbios name %s with first IP %s \
 245 ttl=%d nb_flags=%2x to subnet %s\n",
 246                 nmb_namestr( &namerec->name ),
 247                 inet_ntoa( *iplist ),
 248                 ttl,
 249                 (unsigned int)nb_flags,
 250                 subrec->subnet_name ) );
 251
 252         /* Now add the record to the name list. */
 253
 254         if (subrec == wins_server_subnet) {
 255                 ret = add_name_to_wins_subnet(namerec);
 256                 /* Free namerec - it's stored in the tdb. */
 257                 SAFE_FREE(namerec->data.ip);
 258                 SAFE_FREE(namerec);
 259         } else {
 260                 DLIST_ADD(subrec->namelist, namerec);
 261                 subrec->namelist_changed = True;
 262                 ret = True;
 263         }
 264
 265         return ret;
 266 }
 267
 268 /*******************************************************************
 269  Utility function automatically called when a name refresh or register
 270  succeeds. By definition this is a SELF_NAME (or we wouldn't be registering
 271  it).
 272  ******************************************************************/
 273
 274 void standard_success_register(struct subnet_record *subrec,
 275                              struct userdata_struct *userdata,
 276                              struct nmb_name *nmbname, uint16 nb_flags, int ttl,
 277                              struct in_addr registered_ip)
 278 {
 279         struct name_record *namerec;
 280
 281         namerec = find_name_on_subnet( subrec, nmbname, FIND_SELF_NAME);
 282         if (namerec == NULL) {
 283                 unstring name;
 284                 pull_ascii_nstring(name, sizeof(name), nmbname->name);
 285                 add_name_to_subnet( subrec, name, nmbname->name_type,
 286                         nb_flags, ttl, SELF_NAME, 1, &registered_ip );
 287         } else {
 288                 update_name_ttl( namerec, ttl );
 289         }
 290 }
 291
 292 /*******************************************************************
 293  Utility function automatically called when a name refresh or register
 294  fails. Note that this is only ever called on a broadcast subnet with
 295  one IP address per name. This is why it can just delete the name
 296  without enumerating the IP adresses. JRA.
 297  ******************************************************************/
 298
 299 void standard_fail_register( struct subnet_record   *subrec,
 300                              struct nmb_name        *nmbname )
 301 {
 302         struct name_record *namerec;
 303
 304         namerec = find_name_on_subnet( subrec, nmbname, FIND_SELF_NAME);
 305
 306         DEBUG( 0, ( "standard_fail_register: Failed to register/refresh name %s \
 307 on subnet %s\n", nmb_namestr(nmbname), subrec->subnet_name) );
 308
 309         /* Remove the name from the subnet. */
 310         if( namerec ) {
 311                 remove_name_from_namelist(subrec, namerec);
 312         }
 313 }
 314
 315 /*******************************************************************
 316  Utility function to remove an IP address from a name record.
 317  ******************************************************************/
 318
 319 static void remove_nth_ip_in_record( struct name_record *namerec, int ind)
 320 {
 321         if( ind != namerec->data.num_ips ) {
 322                 memmove( (char *)(&namerec->data.ip[ind]),
 323                                 (char *)(&namerec->data.ip[ind+1]),
 324                                 ( namerec->data.num_ips - ind - 1) * sizeof(struct in_addr) );
 325         }
 326
 327         namerec->data.num_ips--;
 328         if (namerec->subnet == wins_server_subnet) {
 329                 wins_store_changed_namerec(namerec);
 330         } else {
 331                 namerec->subnet->namelist_changed = True;
 332         }
 333 }
 334
 335 /*******************************************************************
 336  Utility function to check if an IP address exists in a name record.
 337  ******************************************************************/
 338
 339 bool find_ip_in_name_record( struct name_record *namerec, struct in_addr ip )
 340 {
 341         int i;
 342
 343         for(i = 0; i < namerec->data.num_ips; i++) {
 344                 if(ip_equal_v4( namerec->data.ip[i], ip)) {
 345                         return True;
 346                 }
 347         }
 348
 349         return False;
 350 }
 351
 352 /*******************************************************************
 353  Utility function to add an IP address to a name record.
 354  ******************************************************************/
 355
 356 void add_ip_to_name_record( struct name_record *namerec, struct in_addr new_ip )
 357 {
 358         struct in_addr *new_list;
 359
 360         /* Don't add one we already have. */
 361         if( find_ip_in_name_record( namerec, new_ip )) {
 362                 return;
 363         }
 364
 365         new_list = SMB_MALLOC_ARRAY( struct in_addr, namerec->data.num_ips + 1);
 366         if( NULL == new_list ) {
 367                 DEBUG(0,("add_ip_to_name_record: Malloc fail !\n"));
 368                 return;
 369         }
 370
 371         memcpy( (char *)new_list, (char *)namerec->data.ip, namerec->data.num_ips * sizeof(struct in_addr) );
 372         new_list[namerec->data.num_ips] = new_ip;
 373
 374         SAFE_FREE(namerec->data.ip);
 375         namerec->data.ip = new_list;
 376         namerec->data.num_ips += 1;
 377
 378         if (namerec->subnet == wins_server_subnet) {
 379                 wins_store_changed_namerec(namerec);
 380         } else {
 381                 namerec->subnet->namelist_changed = True;
 382         }
 383 }
 384
 385 /*******************************************************************
 386  Utility function to remove an IP address from a name record.
 387  ******************************************************************/
 388
 389 void remove_ip_from_name_record( struct name_record *namerec,
 390                                  struct in_addr      remove_ip )
 391 {
 392         /* Try and find the requested ip address - remove it. */
 393         int i;
 394         int orig_num = namerec->data.num_ips;
 395
 396         for(i = 0; i < orig_num; i++) {
 397                 if( ip_equal_v4( remove_ip, namerec->data.ip[i]) ) {
 398                         remove_nth_ip_in_record( namerec, i);
 399                         break;
 400                 }
 401         }
 402 }
 403
 404 /*******************************************************************
 405  Utility function that release_name callers can plug into as the
 406  success function when a name release is successful. Used to save
 407  duplication of success_function code.
 408  ******************************************************************/
 409
 410 void standard_success_release( struct subnet_record   *subrec,
 411                                struct userdata_struct *userdata,
 412                                struct nmb_name        *nmbname,
 413                                struct in_addr          released_ip )
 414 {
 415         struct name_record *namerec;
 416
 417         namerec = find_name_on_subnet( subrec, nmbname, FIND_ANY_NAME );
 418         if( namerec == NULL ) {
 419                 DEBUG( 0, ( "standard_success_release: Name release for name %s IP %s \
 420 on subnet %s. Name was not found on subnet.\n", nmb_namestr(nmbname), inet_ntoa(released_ip),
 421                                 subrec->subnet_name) );
 422                 return;
 423         } else {
 424                 int orig_num = namerec->data.num_ips;
 425
 426                 remove_ip_from_name_record( namerec, released_ip );
 427
 428                 if( namerec->data.num_ips == orig_num ) {
 429                         DEBUG( 0, ( "standard_success_release: Name release for name %s IP %s \
 430 on subnet %s. This ip is not known for this name.\n", nmb_namestr(nmbname), inet_ntoa(released_ip), subrec->subnet_name ) );
 431                 }
 432         }
 433
 434         if( namerec->data.num_ips == 0 ) {
 435                 remove_name_from_namelist( subrec, namerec );
 436         }
 437 }
 438
 439 /*******************************************************************
 440  Expires old names in a subnet namelist.
 441  NB. Does not touch the wins_subnet - no wins specific processing here.
 442 ******************************************************************/
 443
 444 static void expire_names_on_subnet(struct subnet_record *subrec, time_t t)
 445 {
 446         struct name_record *namerec;
 447         struct name_record *next_namerec;
 448
 449         for( namerec = subrec->namelist; namerec; namerec = next_namerec ) {
 450                 next_namerec = namerec->next;
 451                 if( (namerec->data.death_time != PERMANENT_TTL) && (namerec->data.death_time < t) ) {
 452                         if( namerec->data.source == SELF_NAME ) {
 453                                 DEBUG( 3, ( "expire_names_on_subnet: Subnet %s not expiring SELF \
 454 name %s\n", subrec->subnet_name, nmb_namestr(&namerec->name) ) );
 455                                 namerec->data.death_time += 300;
 456                                 namerec->subnet->namelist_changed = True;
 457                                 continue;
 458                         }
 459
 460                         DEBUG(3,("expire_names_on_subnet: Subnet %s - removing expired name %s\n",
 461                                 subrec->subnet_name, nmb_namestr(&namerec->name)));
 462
 463                         remove_name_from_namelist(subrec, namerec );
 464                 }
 465         }
 466 }
 467
 468 /*******************************************************************
 469  Expires old names in all subnet namelists.
 470  NB. Does not touch the wins_subnet.
 471 ******************************************************************/
 472
 473 void expire_names(time_t t)
 474 {
 475         struct subnet_record *subrec;
 476
 477         for( subrec = FIRST_SUBNET; subrec; subrec = NEXT_SUBNET_INCLUDING_UNICAST(subrec) ) {
 478                 expire_names_on_subnet( subrec, t );
 479         }
 480 }
 481
 482 /****************************************************************************
 483   Add the magic samba names, useful for finding samba servers.
 484   These go directly into the name list for a particular subnet,
 485   without going through the normal registration process.
 486   When adding them to the unicast subnet, add them as a list of
 487   all broadcast subnet IP addresses.
 488 **************************************************************************/
 489
 490 void add_samba_names_to_subnet( struct subnet_record *subrec )
 491 {
 492         struct in_addr *iplist = &subrec->myip;
 493         int num_ips = 1;
 494
 495         /* These names are added permanently (ttl of zero) and will NOT be refreshed.  */
 496
 497         if( (subrec == unicast_subnet) || (subrec == wins_server_subnet) || (subrec == remote_broadcast_subnet) ) {
 498                 struct subnet_record *bcast_subrecs;
 499                 int i;
 500
 501                 /* Create an IP list containing all our known subnets. */
 502
 503                 num_ips = iface_count();
 504                 iplist = SMB_MALLOC_ARRAY( struct in_addr, num_ips);
 505                 if( NULL == iplist ) {
 506                         DEBUG(0,("add_samba_names_to_subnet: Malloc fail !\n"));
 507                         return;
 508                 }
 509
 510                 for( bcast_subrecs = FIRST_SUBNET, i = 0; bcast_subrecs &&
 511                                 i < num_ips;
 512                                 bcast_subrecs = NEXT_SUBNET_EXCLUDING_UNICAST(bcast_subrecs), i++ ) {
 513                         iplist[i] = bcast_subrecs->myip;
 514                 }
 515                 num_ips = i;
 516         }
 517
 518         add_name_to_subnet(subrec,"*",0x0,samba_nb_type, PERMANENT_TTL,
 519                                 PERMANENT_NAME, num_ips, iplist);
 520         add_name_to_subnet(subrec,"*",0x20,samba_nb_type,PERMANENT_TTL,
 521                                 PERMANENT_NAME, num_ips, iplist);
 522         add_name_to_subnet(subrec,"__SAMBA__",0x20,samba_nb_type,PERMANENT_TTL,
 523                                 PERMANENT_NAME, num_ips, iplist);
 524         add_name_to_subnet(subrec,"__SAMBA__",0x00,samba_nb_type,PERMANENT_TTL,
 525                                 PERMANENT_NAME, num_ips, iplist);
 526
 527         if(iplist != &subrec->myip) {
 528                 SAFE_FREE(iplist);
 529         }
 530 }
 531
 532 /****************************************************************************
 533  Dump a name_record struct.
 534 **************************************************************************/
 535
 536 void dump_name_record( struct name_record *namerec, XFILE *fp)
 537 {
 538         const char *src_type;
 539         struct tm *tm;
 540         int i;
 541
 542         x_fprintf(fp,"\tName = %s\t", nmb_namestr(&namerec->name));
 543         switch(namerec->data.source) {
 544                 case LMHOSTS_NAME:
 545                         src_type = "LMHOSTS_NAME";
 546                         break;
 547                 case WINS_PROXY_NAME:
 548                         src_type = "WINS_PROXY_NAME";
 549                         break;
 550                 case REGISTER_NAME:
 551                         src_type = "REGISTER_NAME";
 552                         break;
 553                 case SELF_NAME:
 554                         src_type = "SELF_NAME";
 555                         break;
 556                 case DNS_NAME:
 557                         src_type = "DNS_NAME";
 558                         break;
 559                 case DNSFAIL_NAME:
 560                         src_type = "DNSFAIL_NAME";
 561                         break;
 562                 case PERMANENT_NAME:
 563                         src_type = "PERMANENT_NAME";
 564                         break;
 565                 default:
 566                         src_type = "unknown!";
 567                         break;
 568         }
 569
 570         x_fprintf(fp,"Source = %s\nb_flags = %x\t", src_type, namerec->data.nb_flags);
 571
 572         if(namerec->data.death_time != PERMANENT_TTL) {
 573                 const char *asct;
 574                 tm = localtime(&namerec->data.death_time);
 575                 if (!tm) {
 576                         return;
 577                 }
 578                 asct = asctime(tm);
 579                 if (!asct) {
 580                         return;
 581                 }
 582                 x_fprintf(fp, "death_time = %s\t", asct);
 583         } else {
 584                 x_fprintf(fp, "death_time = PERMANENT\t");
 585         }
 586
 587         if(namerec->data.refresh_time != PERMANENT_TTL) {
 588                 const char *asct;
 589                 tm = localtime(&namerec->data.refresh_time);
 590                 if (!tm) {
 591                         return;
 592                 }
 593                 asct = asctime(tm);
 594                 if (!asct) {
 595                         return;
 596                 }
 597                 x_fprintf(fp, "refresh_time = %s\n", asct);
 598         } else {
 599                 x_fprintf(fp, "refresh_time = PERMANENT\n");
 600         }
 601
 602         x_fprintf(fp, "\t\tnumber of IPS = %d", namerec->data.num_ips);
 603         for(i = 0; i < namerec->data.num_ips; i++) {
 604                 x_fprintf(fp, "\t%s", inet_ntoa(namerec->data.ip[i]));
 605         }
 606
 607         x_fprintf(fp, "\n\n");
 608
 609 }
 610
 611 /****************************************************************************
 612  Dump the contents of the namelists on all the subnets (including unicast)
 613  into a file. Initiated by SIGHUP - used to debug the state of the namelists.
 614 **************************************************************************/
 615
 616 static void dump_subnet_namelist( struct subnet_record *subrec, XFILE *fp)
 617 {
 618         struct name_record *namerec;
 619         x_fprintf(fp, "Subnet %s\n----------------------\n", subrec->subnet_name);
 620         for( namerec = subrec->namelist; namerec; namerec = namerec->next) {
 621                 dump_name_record(namerec, fp);
 622         }
 623 }
 624
 625 /****************************************************************************
 626  Dump the contents of the namelists on all the subnets (including unicast)
 627  into a file. Initiated by SIGHUP - used to debug the state of the namelists.
 628 **************************************************************************/
 629
 630 void dump_all_namelists(void)
 631 {
 632         XFILE *fp;
 633         struct subnet_record *subrec;
 634
 635         fp = x_fopen(lock_path("namelist.debug"),O_WRONLY|O_CREAT|O_TRUNC, 0644);
 636
 637         if (!fp) {
 638                 DEBUG(0,("dump_all_namelists: Can't open file %s. Error was %s\n",
 639                         "namelist.debug",strerror(errno)));
 640                 return;
 641         }
 642
 643         for (subrec = FIRST_SUBNET; subrec; subrec = NEXT_SUBNET_INCLUDING_UNICAST(subrec)) {
 644                 dump_subnet_namelist( subrec, fp );
 645         }
 646
 647         if (!we_are_a_wins_client()) {
 648                 dump_subnet_namelist( unicast_subnet, fp );
 649         }
 650
 651         if (remote_broadcast_subnet->namelist != NULL) {
 652                 dump_subnet_namelist( remote_broadcast_subnet, fp );
 653         }
 654
 655         if (wins_server_subnet != NULL) {
 656                 dump_wins_subnet_namelist(fp );
 657         }
 658
 659         x_fclose( fp );
 660 }