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
  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         namerec = SMB_MALLOC_P(struct name_record);
 196         if( NULL == namerec ) {
 197                 DEBUG( 0, ( "add_name_to_subnet: malloc fail.\n" ) );
 198                 return False;
 199         }
 200
 201         memset( (char *)namerec, '\0', sizeof(*namerec) );
 202         namerec->data.ip = SMB_MALLOC_ARRAY( struct in_addr, num_ips );
 203         if( NULL == namerec->data.ip ) {
 204                 DEBUG( 0, ( "add_name_to_subnet: malloc fail when creating ip_flgs.\n" ) );
 205                 ZERO_STRUCTP(namerec);
 206                 SAFE_FREE(namerec);
 207                 return False;
 208         }
 209
 210         namerec->subnet = subrec;
 211
 212         make_nmb_name(&namerec->name, name, type);
 213         upcase_name(&namerec->name, NULL );
 214
 215         /* Enter the name as active. */
 216         namerec->data.nb_flags = nb_flags | NB_ACTIVE;
 217         namerec->data.wins_flags = WINS_ACTIVE;
 218
 219         /* If it's our primary name, flag it as so. */
 220         if (strequal( my_netbios_names(0), name )) {
 221                 namerec->data.nb_flags |= NB_PERM;
 222         }
 223
 224         /* Copy the IPs. */
 225         namerec->data.num_ips = num_ips;
 226         memcpy( (namerec->data.ip), iplist, num_ips * sizeof(struct in_addr) );
 227
 228         /* Data source. */
 229         namerec->data.source = source;
 230
 231         /* Setup the death_time and refresh_time. */
 232         if (ttl == PERMANENT_TTL) {
 233                 namerec->data.death_time = PERMANENT_TTL;
 234         } else {
 235                 namerec->data.death_time = time_now + ttl;
 236         }
 237
 238         namerec->data.refresh_time = time_now + MIN((ttl/2), MAX_REFRESH_TIME);
 239
 240         DEBUG( 3, ( "add_name_to_subnet: Added netbios name %s with first IP %s \
 241 ttl=%d nb_flags=%2x to subnet %s\n",
 242                 nmb_namestr( &namerec->name ),
 243                 inet_ntoa( *iplist ),
 244                 ttl,
 245                 (unsigned int)nb_flags,
 246                 subrec->subnet_name ) );
 247
 248         /* Now add the record to the name list. */
 249
 250         if (subrec == wins_server_subnet) {
 251                 ret = add_name_to_wins_subnet(namerec);
 252                 /* Free namerec - it's stored in the tdb. */
 253                 SAFE_FREE(namerec->data.ip);
 254                 SAFE_FREE(namerec);
 255         } else {
 256                 DLIST_ADD(subrec->namelist, namerec);
 257                 subrec->namelist_changed = True;
 258                 ret = True;
 259         }
 260
 261         return ret;
 262 }
 263
 264 /*******************************************************************
 265  Utility function automatically called when a name refresh or register
 266  succeeds. By definition this is a SELF_NAME (or we wouldn't be registering
 267  it).
 268  ******************************************************************/
 269
 270 void standard_success_register(struct subnet_record *subrec,
 271                              struct userdata_struct *userdata,
 272                              struct nmb_name *nmbname, uint16 nb_flags, int ttl,
 273                              struct in_addr registered_ip)
 274 {
 275         struct name_record *namerec;
 276
 277         namerec = find_name_on_subnet( subrec, nmbname, FIND_SELF_NAME);
 278         if (namerec == NULL) {
 279                 unstring name;
 280                 pull_ascii_nstring(name, sizeof(name), nmbname->name);
 281                 add_name_to_subnet( subrec, name, nmbname->name_type,
 282                         nb_flags, ttl, SELF_NAME, 1, &registered_ip );
 283         } else {
 284                 update_name_ttl( namerec, ttl );
 285         }
 286 }
 287
 288 /*******************************************************************
 289  Utility function automatically called when a name refresh or register
 290  fails. Note that this is only ever called on a broadcast subnet with
 291  one IP address per name. This is why it can just delete the name
 292  without enumerating the IP adresses. JRA.
 293  ******************************************************************/
 294
 295 void standard_fail_register( struct subnet_record   *subrec,
 296                              struct response_record *rrec,
 297                              struct nmb_name        *nmbname )
 298 {
 299         struct name_record *namerec;
 300
 301         namerec = find_name_on_subnet( subrec, nmbname, FIND_SELF_NAME);
 302
 303         DEBUG( 0, ( "standard_fail_register: Failed to register/refresh name %s \
 304 on subnet %s\n", nmb_namestr(nmbname), subrec->subnet_name) );
 305
 306         /* Remove the name from the subnet. */
 307         if( namerec ) {
 308                 remove_name_from_namelist(subrec, namerec);
 309         }
 310 }
 311
 312 /*******************************************************************
 313  Utility function to remove an IP address from a name record.
 314  ******************************************************************/
 315
 316 static void remove_nth_ip_in_record( struct name_record *namerec, int ind)
 317 {
 318         if( ind != namerec->data.num_ips ) {
 319                 memmove( (char *)(&namerec->data.ip[ind]),
 320                                 (char *)(&namerec->data.ip[ind+1]),
 321                                 ( namerec->data.num_ips - ind - 1) * sizeof(struct in_addr) );
 322         }
 323
 324         namerec->data.num_ips--;
 325         if (namerec->subnet == wins_server_subnet) {
 326                 wins_store_changed_namerec(namerec);
 327         } else {
 328                 namerec->subnet->namelist_changed = True;
 329         }
 330 }
 331
 332 /*******************************************************************
 333  Utility function to check if an IP address exists in a name record.
 334  ******************************************************************/
 335
 336 bool find_ip_in_name_record( struct name_record *namerec, struct in_addr ip )
 337 {
 338         int i;
 339
 340         for(i = 0; i < namerec->data.num_ips; i++) {
 341                 if(ip_equal( namerec->data.ip[i], ip)) {
 342                         return True;
 343                 }
 344         }
 345
 346         return False;
 347 }
 348
 349 /*******************************************************************
 350  Utility function to add an IP address to a name record.
 351  ******************************************************************/
 352
 353 void add_ip_to_name_record( struct name_record *namerec, struct in_addr new_ip )
 354 {
 355         struct in_addr *new_list;
 356
 357         /* Don't add one we already have. */
 358         if( find_ip_in_name_record( namerec, new_ip )) {
 359                 return;
 360         }
 361
 362         new_list = SMB_MALLOC_ARRAY( struct in_addr, namerec->data.num_ips + 1);
 363         if( NULL == new_list ) {
 364                 DEBUG(0,("add_ip_to_name_record: Malloc fail !\n"));
 365                 return;
 366         }
 367
 368         memcpy( (char *)new_list, (char *)namerec->data.ip, namerec->data.num_ips * sizeof(struct in_addr) );
 369         new_list[namerec->data.num_ips] = new_ip;
 370
 371         SAFE_FREE(namerec->data.ip);
 372         namerec->data.ip = new_list;
 373         namerec->data.num_ips += 1;
 374
 375         if (namerec->subnet == wins_server_subnet) {
 376                 wins_store_changed_namerec(namerec);
 377         } else {
 378                 namerec->subnet->namelist_changed = True;
 379         }
 380 }
 381
 382 /*******************************************************************
 383  Utility function to remove an IP address from a name record.
 384  ******************************************************************/
 385
 386 void remove_ip_from_name_record( struct name_record *namerec,
 387                                  struct in_addr      remove_ip )
 388 {
 389         /* Try and find the requested ip address - remove it. */
 390         int i;
 391         int orig_num = namerec->data.num_ips;
 392
 393         for(i = 0; i < orig_num; i++) {
 394                 if( ip_equal( remove_ip, namerec->data.ip[i]) ) {
 395                         remove_nth_ip_in_record( namerec, i);
 396                         break;
 397                 }
 398         }
 399 }
 400
 401 /*******************************************************************
 402  Utility function that release_name callers can plug into as the
 403  success function when a name release is successful. Used to save
 404  duplication of success_function code.
 405  ******************************************************************/
 406
 407 void standard_success_release( struct subnet_record   *subrec,
 408                                struct userdata_struct *userdata,
 409                                struct nmb_name        *nmbname,
 410                                struct in_addr          released_ip )
 411 {
 412         struct name_record *namerec;
 413
 414         namerec = find_name_on_subnet( subrec, nmbname, FIND_ANY_NAME );
 415         if( namerec == NULL ) {
 416                 DEBUG( 0, ( "standard_success_release: Name release for name %s IP %s \
 417 on subnet %s. Name was not found on subnet.\n", nmb_namestr(nmbname), inet_ntoa(released_ip),
 418                                 subrec->subnet_name) );
 419                 return;
 420         } else {
 421                 int orig_num = namerec->data.num_ips;
 422
 423                 remove_ip_from_name_record( namerec, released_ip );
 424
 425                 if( namerec->data.num_ips == orig_num ) {
 426                         DEBUG( 0, ( "standard_success_release: Name release for name %s IP %s \
 427 on subnet %s. This ip is not known for this name.\n", nmb_namestr(nmbname), inet_ntoa(released_ip), subrec->subnet_name ) );
 428                 }
 429         }
 430
 431         if( namerec->data.num_ips == 0 ) {
 432                 remove_name_from_namelist( subrec, namerec );
 433         }
 434 }
 435
 436 /*******************************************************************
 437  Expires old names in a subnet namelist.
 438  NB. Does not touch the wins_subnet - no wins specific processing here.
 439 ******************************************************************/
 440
 441 static void expire_names_on_subnet(struct subnet_record *subrec, time_t t)
 442 {
 443         struct name_record *namerec;
 444         struct name_record *next_namerec;
 445
 446         for( namerec = subrec->namelist; namerec; namerec = next_namerec ) {
 447                 next_namerec = namerec->next;
 448                 if( (namerec->data.death_time != PERMANENT_TTL) && (namerec->data.death_time < t) ) {
 449                         if( namerec->data.source == SELF_NAME ) {
 450                                 DEBUG( 3, ( "expire_names_on_subnet: Subnet %s not expiring SELF \
 451 name %s\n", subrec->subnet_name, nmb_namestr(&namerec->name) ) );
 452                                 namerec->data.death_time += 300;
 453                                 namerec->subnet->namelist_changed = True;
 454                                 continue;
 455                         }
 456
 457                         DEBUG(3,("expire_names_on_subnet: Subnet %s - removing expired name %s\n",
 458                                 subrec->subnet_name, nmb_namestr(&namerec->name)));
 459
 460                         remove_name_from_namelist(subrec, namerec );
 461                 }
 462         }
 463 }
 464
 465 /*******************************************************************
 466  Expires old names in all subnet namelists.
 467  NB. Does not touch the wins_subnet.
 468 ******************************************************************/
 469
 470 void expire_names(time_t t)
 471 {
 472         struct subnet_record *subrec;
 473
 474         for( subrec = FIRST_SUBNET; subrec; subrec = NEXT_SUBNET_INCLUDING_UNICAST(subrec) ) {
 475                 expire_names_on_subnet( subrec, t );
 476         }
 477 }
 478
 479 /****************************************************************************
 480   Add the magic samba names, useful for finding samba servers.
 481   These go directly into the name list for a particular subnet,
 482   without going through the normal registration process.
 483   When adding them to the unicast subnet, add them as a list of
 484   all broadcast subnet IP addresses.
 485 **************************************************************************/
 486
 487 void add_samba_names_to_subnet( struct subnet_record *subrec )
 488 {
 489         struct in_addr *iplist = &subrec->myip;
 490         int num_ips = 1;
 491
 492         /* These names are added permanently (ttl of zero) and will NOT be refreshed.  */
 493
 494         if( (subrec == unicast_subnet) || (subrec == wins_server_subnet) || (subrec == remote_broadcast_subnet) ) {
 495                 struct subnet_record *bcast_subrecs;
 496                 int i;
 497
 498                 /* Create an IP list containing all our known subnets. */
 499
 500                 num_ips = iface_count();
 501                 iplist = SMB_MALLOC_ARRAY( struct in_addr, num_ips);
 502                 if( NULL == iplist ) {
 503                         DEBUG(0,("add_samba_names_to_subnet: Malloc fail !\n"));
 504                         return;
 505                 }
 506
 507                 for( bcast_subrecs = FIRST_SUBNET, i = 0; bcast_subrecs; bcast_subrecs = NEXT_SUBNET_EXCLUDING_UNICAST(bcast_subrecs), i++ )
 508                         iplist[i] = bcast_subrecs->myip;
 509         }
 510
 511         add_name_to_subnet(subrec,"*",0x0,samba_nb_type, PERMANENT_TTL,
 512                                 PERMANENT_NAME, num_ips, iplist);
 513         add_name_to_subnet(subrec,"*",0x20,samba_nb_type,PERMANENT_TTL,
 514                                 PERMANENT_NAME, num_ips, iplist);
 515         add_name_to_subnet(subrec,"__SAMBA__",0x20,samba_nb_type,PERMANENT_TTL,
 516                                 PERMANENT_NAME, num_ips, iplist);
 517         add_name_to_subnet(subrec,"__SAMBA__",0x00,samba_nb_type,PERMANENT_TTL,
 518                                 PERMANENT_NAME, num_ips, iplist);
 519
 520         if(iplist != &subrec->myip) {
 521                 SAFE_FREE(iplist);
 522         }
 523 }
 524
 525 /****************************************************************************
 526  Dump a name_record struct.
 527 **************************************************************************/
 528
 529 void dump_name_record( struct name_record *namerec, XFILE *fp)
 530 {
 531         const char *src_type;
 532         struct tm *tm;
 533         int i;
 534
 535         x_fprintf(fp,"\tName = %s\t", nmb_namestr(&namerec->name));
 536         switch(namerec->data.source) {
 537                 case LMHOSTS_NAME:
 538                         src_type = "LMHOSTS_NAME";
 539                         break;
 540                 case WINS_PROXY_NAME:
 541                         src_type = "WINS_PROXY_NAME";
 542                         break;
 543                 case REGISTER_NAME:
 544                         src_type = "REGISTER_NAME";
 545                         break;
 546                 case SELF_NAME:
 547                         src_type = "SELF_NAME";
 548                         break;
 549                 case DNS_NAME:
 550                         src_type = "DNS_NAME";
 551                         break;
 552                 case DNSFAIL_NAME:
 553                         src_type = "DNSFAIL_NAME";
 554                         break;
 555                 case PERMANENT_NAME:
 556                         src_type = "PERMANENT_NAME";
 557                         break;
 558                 default:
 559                         src_type = "unknown!";
 560                         break;
 561         }
 562
 563         x_fprintf(fp,"Source = %s\nb_flags = %x\t", src_type, namerec->data.nb_flags);
 564
 565         if(namerec->data.death_time != PERMANENT_TTL) {
 566                 const char *asct;
 567                 tm = localtime(&namerec->data.death_time);
 568                 if (!tm) {
 569                         return;
 570                 }
 571                 asct = asctime(tm);
 572                 if (!asct) {
 573                         return;
 574                 }
 575                 x_fprintf(fp, "death_time = %s\t", asct);
 576         } else {
 577                 x_fprintf(fp, "death_time = PERMANENT\t");
 578         }
 579
 580         if(namerec->data.refresh_time != PERMANENT_TTL) {
 581                 const char *asct;
 582                 tm = localtime(&namerec->data.refresh_time);
 583                 if (!tm) {
 584                         return;
 585                 }
 586                 asct = asctime(tm);
 587                 if (!asct) {
 588                         return;
 589                 }
 590                 x_fprintf(fp, "refresh_time = %s\n", asct);
 591         } else {
 592                 x_fprintf(fp, "refresh_time = PERMANENT\n");
 593         }
 594
 595         x_fprintf(fp, "\t\tnumber of IPS = %d", namerec->data.num_ips);
 596         for(i = 0; i < namerec->data.num_ips; i++) {
 597                 x_fprintf(fp, "\t%s", inet_ntoa(namerec->data.ip[i]));
 598         }
 599
 600         x_fprintf(fp, "\n\n");
 601
 602 }
 603
 604 /****************************************************************************
 605  Dump the contents of the namelists on all the subnets (including unicast)
 606  into a file. Initiated by SIGHUP - used to debug the state of the namelists.
 607 **************************************************************************/
 608
 609 static void dump_subnet_namelist( struct subnet_record *subrec, XFILE *fp)
 610 {
 611         struct name_record *namerec;
 612         x_fprintf(fp, "Subnet %s\n----------------------\n", subrec->subnet_name);
 613         for( namerec = subrec->namelist; namerec; namerec = namerec->next) {
 614                 dump_name_record(namerec, fp);
 615         }
 616 }
 617
 618 /****************************************************************************
 619  Dump the contents of the namelists on all the subnets (including unicast)
 620  into a file. Initiated by SIGHUP - used to debug the state of the namelists.
 621 **************************************************************************/
 622
 623 void dump_all_namelists(void)
 624 {
 625         XFILE *fp;
 626         struct subnet_record *subrec;
 627
 628         fp = x_fopen(lock_path("namelist.debug"),O_WRONLY|O_CREAT|O_TRUNC, 0644);
 629
 630         if (!fp) {
 631                 DEBUG(0,("dump_all_namelists: Can't open file %s. Error was %s\n",
 632                         "namelist.debug",strerror(errno)));
 633                 return;
 634         }
 635
 636         for (subrec = FIRST_SUBNET; subrec; subrec = NEXT_SUBNET_INCLUDING_UNICAST(subrec)) {
 637                 dump_subnet_namelist( subrec, fp );
 638         }
 639
 640         if (!we_are_a_wins_client()) {
 641                 dump_subnet_namelist( unicast_subnet, fp );
 642         }
 643
 644         if (remote_broadcast_subnet->namelist != NULL) {
 645                 dump_subnet_namelist( remote_broadcast_subnet, fp );
 646         }
 647
 648         if (wins_server_subnet != NULL) {
 649                 dump_wins_subnet_namelist(fp );
 650         }
 651
 652         x_fclose( fp );
 653 }