source/nmbd/nmbd_winsserver.c

   1 /*
   2    Unix SMB/CIFS implementation.
   3    NBT netbios routines and daemon - version 2
   4
   5    Copyright (C) Jeremy Allison 1994-2003
   6
   7    This program is free software; you can redistribute it and/or modify
   8    it under the terms of the GNU General Public License as published by
   9    the Free Software Foundation; either version 2 of the License, or
  10    (at your option) any later version.
  11
  12    This program is distributed in the hope that it will be useful,
  13    but WITHOUT ANY WARRANTY; without even the implied warranty of
  14    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  15    GNU General Public License for more details.
  16
  17    You should have received a copy of the GNU General Public License
  18    along with this program; if not, write to the Free Software
  19    Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
  20
  21 */
  22
  23 #include "includes.h"
  24
  25 #define WINS_LIST "wins.dat"
  26 #define WINS_VERSION 1
  27
  28 /****************************************************************************
  29  Change the wins owner address in the record.
  30 *****************************************************************************/
  31
  32 static void update_wins_owner(struct name_record *namerec, struct in_addr wins_ip)
  33 {
  34         if (namerec==NULL)
  35                 return;
  36         namerec->data.wins_ip=wins_ip;
  37 }
  38
  39 /****************************************************************************
  40  Create the wins flags based on the nb flags and the input value.
  41 *****************************************************************************/
  42
  43 static void update_wins_flag(struct name_record *namerec, int flags)
  44 {
  45         if (namerec==NULL)
  46                 return;
  47
  48         namerec->data.wins_flags=0x0;
  49
  50         /* if it's a group, it can be a normal or a special one */
  51         if (namerec->data.nb_flags & NB_GROUP) {
  52                 if (namerec->name.name_type==0x1C)
  53                         namerec->data.wins_flags|=WINS_SGROUP;
  54                 else
  55                         if (namerec->data.num_ips>1)
  56                                 namerec->data.wins_flags|=WINS_SGROUP;
  57                         else
  58                                 namerec->data.wins_flags|=WINS_NGROUP;
  59         } else {
  60                 /* can be unique or multi-homed */
  61                 if (namerec->data.num_ips>1)
  62                         namerec->data.wins_flags|=WINS_MHOMED;
  63                 else
  64                         namerec->data.wins_flags|=WINS_UNIQUE;
  65         }
  66
  67         /* the node type are the same bits */
  68         namerec->data.wins_flags|=namerec->data.nb_flags&NB_NODETYPEMASK;
  69
  70         /* the static bit is elsewhere */
  71         if (namerec->data.death_time == PERMANENT_TTL)
  72                 namerec->data.wins_flags|=WINS_STATIC;
  73
  74         /* and add the given bits */
  75         namerec->data.wins_flags|=flags;
  76
  77         DEBUG(8,("update_wins_flag: nbflags: 0x%x, ttl: 0x%d, flags: 0x%x, winsflags: 0x%x\n",
  78                  namerec->data.nb_flags, (int)namerec->data.death_time, flags, namerec->data.wins_flags));
  79 }
  80
  81 /****************************************************************************
  82  Return the general ID value and increase it if requested.
  83 *****************************************************************************/
  84
  85 static void get_global_id_and_update(SMB_BIG_UINT *current_id, BOOL update)
  86 {
  87         /*
  88          * it's kept as a static here, to prevent people from messing
  89          * with the value directly
  90          */
  91
  92         static SMB_BIG_UINT general_id = 1;
  93
  94         DEBUG(5,("get_global_id_and_update: updating version ID: %d\n", (int)general_id));
  95
  96         *current_id = general_id;
  97
  98         if (update)
  99                 general_id++;
 100 }
 101
 102 /****************************************************************************
 103  Possibly call the WINS hook external program when a WINS change is made.
 104 *****************************************************************************/
 105
 106 static void wins_hook(const char *operation, struct name_record *namerec, int ttl)
 107 {
 108         pstring command;
 109         char *cmd = lp_wins_hook();
 110         char *p;
 111         int i;
 112
 113         if (!cmd || !*cmd) return;
 114
 115         for (p=namerec->name.name; *p; p++) {
 116                 if (!(isalnum((int)*p) || strchr_m("._-",*p))) {
 117                         DEBUG(3,("not calling wins hook for invalid name %s\n", nmb_namestr(&namerec->name)));
 118                         return;
 119                 }
 120         }
 121
 122         p = command;
 123         p += slprintf(p, sizeof(command)-1, "%s %s %s %02x %d",
 124                       cmd,
 125                       operation,
 126                       nmb_namestr(&namerec->name),
 127                       namerec->name.name_type,
 128                       ttl);
 129
 130         for (i=0;i<namerec->data.num_ips;i++) {
 131                 p += slprintf(p, sizeof(command) - (p-command) -1, " %s", inet_ntoa(namerec->data.ip[i]));
 132         }
 133
 134         DEBUG(3,("calling wins hook for %s\n", nmb_namestr(&namerec->name)));
 135         smbrun(command, NULL);
 136 }
 137
 138
 139 /****************************************************************************
 140 Determine if this packet should be allocated to the WINS server.
 141 *****************************************************************************/
 142
 143 BOOL packet_is_for_wins_server(struct packet_struct *packet)
 144 {
 145         struct nmb_packet *nmb = &packet->packet.nmb;
 146
 147         /* Only unicast packets go to a WINS server. */
 148         if((wins_server_subnet == NULL) || (nmb->header.nm_flags.bcast == True)) {
 149                 DEBUG(10, ("packet_is_for_wins_server: failing WINS test #1.\n"));
 150                 return False;
 151         }
 152
 153         /* Check for node status requests. */
 154         if (nmb->question.question_type != QUESTION_TYPE_NB_QUERY)
 155                 return False;
 156
 157         switch(nmb->header.opcode) {
 158                 /*
 159                  * A WINS server issues WACKS, not receives them.
 160                  */
 161                 case NMB_WACK_OPCODE:
 162                         DEBUG(10, ("packet_is_for_wins_server: failing WINS test #2 (WACK).\n"));
 163                         return False;
 164                 /*
 165                  * A WINS server only processes registration and
 166                  * release requests, not responses.
 167                  */
 168                 case NMB_NAME_REG_OPCODE:
 169                 case NMB_NAME_MULTIHOMED_REG_OPCODE:
 170                 case NMB_NAME_REFRESH_OPCODE_8: /* ambiguity in rfc1002 about which is correct. */
 171                 case NMB_NAME_REFRESH_OPCODE_9: /* WinNT uses 8 by default. */
 172                         if(nmb->header.response) {
 173                                 DEBUG(10, ("packet_is_for_wins_server: failing WINS test #3 (response = 1).\n"));
 174                                 return False;
 175                         }
 176                         break;
 177
 178                 case NMB_NAME_RELEASE_OPCODE:
 179                         if(nmb->header.response) {
 180                                 DEBUG(10, ("packet_is_for_wins_server: failing WINS test #4 (response = 1).\n"));
 181                                 return False;
 182                         }
 183                         break;
 184
 185                 /*
 186                  * Only process unicast name queries with rd = 1.
 187                  */
 188                 case NMB_NAME_QUERY_OPCODE:
 189                         if(!nmb->header.response && !nmb->header.nm_flags.recursion_desired) {
 190                                 DEBUG(10, ("packet_is_for_wins_server: failing WINS test #5 (response = 1).\n"));
 191                                 return False;
 192                         }
 193                         break;
 194         }
 195
 196         return True;
 197 }
 198
 199 /****************************************************************************
 200 Utility function to decide what ttl to give a register/refresh request.
 201 *****************************************************************************/
 202
 203 static int get_ttl_from_packet(struct nmb_packet *nmb)
 204 {
 205         int ttl = nmb->additional->ttl;
 206
 207         if(ttl < lp_min_wins_ttl() )
 208                 ttl = lp_min_wins_ttl();
 209
 210         if(ttl > lp_max_wins_ttl() )
 211                 ttl = lp_max_wins_ttl();
 212
 213         return ttl;
 214 }
 215
 216 /****************************************************************************
 217 Load or create the WINS database.
 218 *****************************************************************************/
 219
 220 BOOL initialise_wins(void)
 221 {
 222         time_t time_now = time(NULL);
 223         XFILE *fp;
 224         pstring line;
 225
 226         if(!lp_we_are_a_wins_server())
 227                 return True;
 228
 229         add_samba_names_to_subnet(wins_server_subnet);
 230
 231         if((fp = x_fopen(lock_path(WINS_LIST),O_RDONLY,0)) == NULL) {
 232                 DEBUG(2,("initialise_wins: Can't open wins database file %s. Error was %s\n",
 233                         WINS_LIST, strerror(errno) ));
 234                 return True;
 235         }
 236
 237         while (!x_feof(fp)) {
 238                 pstring name_str, ip_str, ttl_str, nb_flags_str;
 239                 unsigned int num_ips;
 240                 pstring name;
 241                 struct in_addr *ip_list;
 242                 int type = 0;
 243                 int nb_flags;
 244                 int ttl;
 245                 const char *ptr;
 246                 char *p;
 247                 BOOL got_token;
 248                 BOOL was_ip;
 249                 int i;
 250                 unsigned int hash;
 251                 int version;
 252
 253                 /* Read a line from the wins.dat file. Strips whitespace
 254                         from the beginning and end of the line.  */
 255                 if (!fgets_slash(line,sizeof(pstring),fp))
 256                         continue;
 257
 258                 if (*line == '#')
 259                         continue;
 260
 261                 if (strncmp(line,"VERSION ", 8) == 0) {
 262                         if (sscanf(line,"VERSION %d %u", &version, &hash) != 2 ||
 263                                                 version != WINS_VERSION) {
 264                                 DEBUG(0,("Discarding invalid wins.dat file [%s]\n",line));
 265                                 x_fclose(fp);
 266                                 return True;
 267                         }
 268                         continue;
 269                 }
 270
 271                 ptr = line;
 272
 273                 /*
 274                  * Now we handle multiple IP addresses per name we need
 275                  * to iterate over the line twice. The first time to
 276                  * determine how many IP addresses there are, the second
 277                  * time to actually parse them into the ip_list array.
 278                  */
 279
 280                 if (!next_token(&ptr,name_str,NULL,sizeof(name_str))) {
 281                         DEBUG(0,("initialise_wins: Failed to parse name when parsing line %s\n", line ));
 282                         continue;
 283                 }
 284
 285                 if (!next_token(&ptr,ttl_str,NULL,sizeof(ttl_str))) {
 286                         DEBUG(0,("initialise_wins: Failed to parse time to live when parsing line %s\n", line ));
 287                         continue;
 288                 }
 289
 290                 /*
 291                  * Determine the number of IP addresses per line.
 292                  */
 293                 num_ips = 0;
 294                 do {
 295                         got_token = next_token(&ptr,ip_str,NULL,sizeof(ip_str));
 296                         was_ip = False;
 297
 298                         if(got_token && strchr(ip_str, '.')) {
 299                                 num_ips++;
 300                                 was_ip = True;
 301                         }
 302                 } while( got_token && was_ip);
 303
 304                 if(num_ips == 0) {
 305                         DEBUG(0,("initialise_wins: Missing IP address when parsing line %s\n", line ));
 306                         continue;
 307                 }
 308
 309                 if(!got_token) {
 310                         DEBUG(0,("initialise_wins: Missing nb_flags when parsing line %s\n", line ));
 311                         continue;
 312                 }
 313
 314                 /* Allocate the space for the ip_list. */
 315                 if((ip_list = (struct in_addr *)malloc( num_ips * sizeof(struct in_addr))) == NULL) {
 316                         DEBUG(0,("initialise_wins: Malloc fail !\n"));
 317                         return False;
 318                 }
 319
 320                 /* Reset and re-parse the line. */
 321                 ptr = line;
 322                 next_token(&ptr,name_str,NULL,sizeof(name_str));
 323                 next_token(&ptr,ttl_str,NULL,sizeof(ttl_str));
 324                 for(i = 0; i < num_ips; i++) {
 325                         next_token(&ptr, ip_str, NULL, sizeof(ip_str));
 326                         ip_list[i] = *interpret_addr2(ip_str);
 327                 }
 328                 next_token(&ptr,nb_flags_str,NULL, sizeof(nb_flags_str));
 329
 330                 /*
 331                  * Deal with SELF or REGISTER name encoding. Default is REGISTER
 332                  * for compatibility with old nmbds.
 333                  */
 334
 335                 if(nb_flags_str[strlen(nb_flags_str)-1] == 'S') {
 336                         DEBUG(5,("initialise_wins: Ignoring SELF name %s\n", line));
 337                         SAFE_FREE(ip_list);
 338                         continue;
 339                 }
 340
 341                 if(nb_flags_str[strlen(nb_flags_str)-1] == 'R')
 342                         nb_flags_str[strlen(nb_flags_str)-1] = '\0';
 343
 344                 /* Netbios name. # divides the name from the type (hex): netbios#xx */
 345                 pstrcpy(name,name_str);
 346
 347                 if((p = strchr(name,'#')) != NULL) {
 348                         *p = 0;
 349                         sscanf(p+1,"%x",&type);
 350                 }
 351
 352                 /* Decode the netbios flags (hex) and the time-to-live (in seconds). */
 353                 sscanf(nb_flags_str,"%x",&nb_flags);
 354                 sscanf(ttl_str,"%d",&ttl);
 355
 356                 /* add all entries that have 60 seconds or more to live */
 357                 if ((ttl - 60) > time_now || ttl == PERMANENT_TTL) {
 358                         if(ttl != PERMANENT_TTL)
 359                                 ttl -= time_now;
 360
 361                         DEBUG( 4, ("initialise_wins: add name: %s#%02x ttl = %d first IP %s flags = %2x\n",
 362                                 name, type, ttl, inet_ntoa(ip_list[0]), nb_flags));
 363
 364                         (void)add_name_to_subnet( wins_server_subnet, name, type, nb_flags,
 365                                         ttl, REGISTER_NAME, num_ips, ip_list );
 366                 } else {
 367                         DEBUG(4, ("initialise_wins: not adding name (ttl problem) %s#%02x ttl = %d first IP %s flags = %2x\n",
 368                                 name, type, ttl, inet_ntoa(ip_list[0]), nb_flags));
 369                 }
 370
 371                 SAFE_FREE(ip_list);
 372         }
 373
 374         x_fclose(fp);
 375         return True;
 376 }
 377
 378 /****************************************************************************
 379 Send a WINS WACK (Wait ACKnowledgement) response.
 380 **************************************************************************/
 381
 382 static void send_wins_wack_response(int ttl, struct packet_struct *p)
 383 {
 384         struct nmb_packet *nmb = &p->packet.nmb;
 385         unsigned char rdata[2];
 386
 387         rdata[0] = rdata[1] = 0;
 388
 389         /* Taken from nmblib.c - we need to send back almost
 390                 identical bytes from the requesting packet header. */
 391
 392         rdata[0] = (nmb->header.opcode & 0xF) << 3;
 393         if (nmb->header.nm_flags.authoritative && nmb->header.response)
 394                 rdata[0] |= 0x4;
 395         if (nmb->header.nm_flags.trunc)
 396                 rdata[0] |= 0x2;
 397         if (nmb->header.nm_flags.recursion_desired)
 398                 rdata[0] |= 0x1;
 399         if (nmb->header.nm_flags.recursion_available && nmb->header.response)
 400                 rdata[1] |= 0x80;
 401         if (nmb->header.nm_flags.bcast)
 402                 rdata[1] |= 0x10;
 403
 404         reply_netbios_packet(p,                                /* Packet to reply to. */
 405                                 0,                             /* Result code. */
 406                                 NMB_WAIT_ACK,                  /* nmbd type code. */
 407                                 NMB_WACK_OPCODE,               /* opcode. */
 408                                 ttl,                           /* ttl. */
 409                                 (char *)rdata,                 /* data to send. */
 410                                 2);                            /* data length. */
 411 }
 412
 413 /****************************************************************************
 414 Send a WINS name registration response.
 415 **************************************************************************/
 416
 417 static void send_wins_name_registration_response(int rcode, int ttl, struct packet_struct *p)
 418 {
 419         struct nmb_packet *nmb = &p->packet.nmb;
 420         char rdata[6];
 421
 422         memcpy(&rdata[0], &nmb->additional->rdata[0], 6);
 423
 424         reply_netbios_packet(p,                                /* Packet to reply to. */
 425                                 rcode,                         /* Result code. */
 426                                 WINS_REG,                      /* nmbd type code. */
 427                                 NMB_NAME_REG_OPCODE,           /* opcode. */
 428                                 ttl,                           /* ttl. */
 429                                 rdata,                         /* data to send. */
 430                                 6);                            /* data length. */
 431 }
 432
 433 /***********************************************************************
 434  Deal with a name refresh request to a WINS server.
 435 ************************************************************************/
 436
 437 void wins_process_name_refresh_request(struct subnet_record *subrec,
 438                                             struct packet_struct *p)
 439 {
 440         struct nmb_packet *nmb = &p->packet.nmb;
 441         struct nmb_name *question = &nmb->question.question_name;
 442         BOOL bcast = nmb->header.nm_flags.bcast;
 443         uint16 nb_flags = get_nb_flags(nmb->additional->rdata);
 444         BOOL group = (nb_flags & NB_GROUP) ? True : False;
 445         struct name_record *namerec = NULL;
 446         int ttl = get_ttl_from_packet(nmb);
 447         struct in_addr from_ip;
 448         struct in_addr our_fake_ip = *interpret_addr2("0.0.0.0");
 449
 450         putip((char *)&from_ip,&nmb->additional->rdata[2]);
 451
 452         if(bcast) {
 453                 /*
 454                  * We should only get unicast name refresh packets here.
 455                  * Anyone trying to refresh broadcast should not be going to a WINS
 456                  * server. Log an error here.
 457                  */
 458
 459                 DEBUG(0,("wins_process_name_refresh_request: broadcast name refresh request \
 460 received for name %s from IP %s on subnet %s. Error - should not be sent to WINS server\n",
 461                         nmb_namestr(question), inet_ntoa(from_ip), subrec->subnet_name));
 462                 return;
 463         }
 464
 465         DEBUG(3,("wins_process_name_refresh_request: Name refresh for name %s \
 466 IP %s\n", nmb_namestr(question), inet_ntoa(from_ip) ));
 467
 468         /*
 469          * See if the name already exists.
 470          */
 471
 472         namerec = find_name_on_subnet(subrec, question, FIND_ANY_NAME);
 473
 474         /*
 475          * If this is a refresh request and the name doesn't exist then
 476          * treat it like a registration request. This allows us to recover
 477          * from errors (tridge)
 478          */
 479
 480         if(namerec == NULL) {
 481                 DEBUG(3,("wins_process_name_refresh_request: Name refresh for name %s and \
 482 the name does not exist. Treating as registration.\n", nmb_namestr(question) ));
 483                 wins_process_name_registration_request(subrec,p);
 484                 return;
 485         }
 486
 487         /*
 488          * if the name is present but not active,
 489          * simply remove it and treat the request
 490          * as a registration
 491          */
 492         if (namerec != NULL && !WINS_STATE_ACTIVE(namerec)) {
 493                 DEBUG(5,("wins_process_name_refresh_request: Name (%s) in WINS was \
 494 not active - removing it.\n", nmb_namestr(question) ));
 495                 remove_name_from_namelist( subrec, namerec );
 496                 namerec = NULL;
 497                 wins_process_name_registration_request(subrec,p);
 498                 return;
 499         }
 500
 501         /*
 502          * Check that the group bits for the refreshing name and the
 503          * name in our database match.
 504          */
 505
 506         if((namerec != NULL) && ((group && !NAME_GROUP(namerec)) || (!group && NAME_GROUP(namerec))) ) {
 507                 DEBUG(3,("wins_process_name_refresh_request: Name %s group bit = %s \
 508 does not match group bit in WINS for this name.\n", nmb_namestr(question), group ? "True" : "False" ));
 509                 send_wins_name_registration_response(RFS_ERR, 0, p);
 510                 return;
 511         }
 512
 513         /*
 514          * For a unique name check that the person refreshing the name is one of the registered IP
 515          * addresses. If not - fail the refresh. Do the same for group names with a type of 0x1c.
 516          * Just return success for unique 0x1d refreshes. For normal group names update the ttl
 517          * and return success.
 518          */
 519
 520         if((!group || (group && (question->name_type == 0x1c))) && find_ip_in_name_record(namerec, from_ip )) {
 521                 /*
 522                  * Update the ttl.
 523                  */
 524                 update_name_ttl(namerec, ttl);
 525
 526                 /*
 527                  * if the record is a replica:
 528                  * we take ownership and update the version ID.
 529                  */
 530                 if (!ip_equal(namerec->data.wins_ip, our_fake_ip)) {
 531                         update_wins_owner(namerec, our_fake_ip);
 532                         get_global_id_and_update(&namerec->data.id, True);
 533                 }
 534
 535                 send_wins_name_registration_response(0, ttl, p);
 536                 wins_hook("refresh", namerec, ttl);
 537                 return;
 538         } else if(group) {
 539                 /*
 540                  * Normal groups are all registered with an IP address of 255.255.255.255
 541                  * so we can't search for the IP address.
 542                  */
 543                 update_name_ttl(namerec, ttl);
 544                 send_wins_name_registration_response(0, ttl, p);
 545                 return;
 546         } else if(!group && (question->name_type == 0x1d)) {
 547                 /*
 548                  * Special name type - just pretend the refresh succeeded.
 549                  */
 550                 send_wins_name_registration_response(0, ttl, p);
 551                 return;
 552         } else {
 553                 /*
 554                  * Fail the refresh.
 555                  */
 556
 557                 DEBUG(3,("wins_process_name_refresh_request: Name refresh for name %s with IP %s and \
 558 is IP is not known to the name.\n", nmb_namestr(question), inet_ntoa(from_ip) ));
 559                 send_wins_name_registration_response(RFS_ERR, 0, p);
 560                 return;
 561         }
 562 }
 563
 564 /***********************************************************************
 565  Deal with a name registration request query success to a client that
 566  owned the name.
 567
 568  We have a locked pointer to the original packet stashed away in the
 569  userdata pointer. The success here is actually a failure as it means
 570  the client we queried wants to keep the name, so we must return
 571  a registration failure to the original requestor.
 572 ************************************************************************/
 573
 574 static void wins_register_query_success(struct subnet_record *subrec,
 575                                              struct userdata_struct *userdata,
 576                                              struct nmb_name *question_name,
 577                                              struct in_addr ip,
 578                                              struct res_rec *answers)
 579 {
 580         struct packet_struct *orig_reg_packet;
 581
 582         memcpy((char *)&orig_reg_packet, userdata->data, sizeof(struct packet_struct *));
 583
 584         DEBUG(3,("wins_register_query_success: Original client at IP %s still wants the \
 585 name %s. Rejecting registration request.\n", inet_ntoa(ip), nmb_namestr(question_name) ));
 586
 587         send_wins_name_registration_response(RFS_ERR, 0, orig_reg_packet);
 588
 589         orig_reg_packet->locked = False;
 590         free_packet(orig_reg_packet);
 591 }
 592
 593 /***********************************************************************
 594  Deal with a name registration request query failure to a client that
 595  owned the name.
 596
 597  We have a locked pointer to the original packet stashed away in the
 598  userdata pointer. The failure here is actually a success as it means
 599  the client we queried didn't want to keep the name, so we can remove
 600  the old name record and then successfully add the new name.
 601 ************************************************************************/
 602
 603 static void wins_register_query_fail(struct subnet_record *subrec,
 604                                           struct response_record *rrec,
 605                                           struct nmb_name *question_name,
 606                                           int rcode)
 607 {
 608         struct userdata_struct *userdata = rrec->userdata;
 609         struct packet_struct *orig_reg_packet;
 610         struct name_record *namerec = NULL;
 611
 612         memcpy((char *)&orig_reg_packet, userdata->data, sizeof(struct packet_struct *));
 613
 614         /*
 615          * We want to just add the name, as we now know the original owner
 616          * didn't want it. But we can't just do that as an arbitary
 617          * amount of time may have taken place between the name query
 618          * request and this timeout/error response. So we check that
 619          * the name still exists and is in the same state - if so
 620          * we remove it and call wins_process_name_registration_request()
 621          * as we know it will do the right thing now.
 622          */
 623
 624         namerec = find_name_on_subnet(subrec, question_name, FIND_ANY_NAME);
 625
 626         if( (namerec != NULL) && (namerec->data.source == REGISTER_NAME) && ip_equal(rrec->packet->ip, *namerec->data.ip) ) {
 627                 remove_name_from_namelist( subrec, namerec);
 628                 namerec = NULL;
 629         }
 630
 631         if(namerec == NULL)
 632                 wins_process_name_registration_request(subrec, orig_reg_packet);
 633         else
 634                 DEBUG(2,("wins_register_query_fail: The state of the WINS database changed between \
 635 querying for name %s in order to replace it and this reply.\n", nmb_namestr(question_name) ));
 636
 637         orig_reg_packet->locked = False;
 638         free_packet(orig_reg_packet);
 639 }
 640
 641 /***********************************************************************
 642  Deal with a name registration request to a WINS server.
 643
 644  Use the following pseudocode :
 645
 646  registering_group
 647      |
 648      |
 649      +--------name exists
 650      |                  |
 651      |                  |
 652      |                  +--- existing name is group
 653      |                  |                      |
 654      |                  |                      |
 655      |                  |                      +--- add name (return).
 656      |                  |
 657      |                  |
 658      |                  +--- exiting name is unique
 659      |                                         |
 660      |                                         |
 661      |                                         +--- query existing owner (return).
 662      |
 663      |
 664      +--------name doesn't exist
 665                         |
 666                         |
 667                         +--- add name (return).
 668
 669  registering_unique
 670      |
 671      |
 672      +--------name exists
 673      |                  |
 674      |                  |
 675      |                  +--- existing name is group
 676      |                  |                      |
 677      |                  |                      |
 678      |                  |                      +--- fail add (return).
 679      |                  |
 680      |                  |
 681      |                  +--- exiting name is unique
 682      |                                         |
 683      |                                         |
 684      |                                         +--- query existing owner (return).
 685      |
 686      |
 687      +--------name doesn't exist
 688                         |
 689                         |
 690                         +--- add name (return).
 691
 692  As can be seen from the above, the two cases may be collapsed onto each
 693  other with the exception of the case where the name already exists and
 694  is a group name. This case we handle with an if statement.
 695
 696 ************************************************************************/
 697
 698 void wins_process_name_registration_request(struct subnet_record *subrec,
 699                                             struct packet_struct *p)
 700 {
 701         nstring name;
 702         struct nmb_packet *nmb = &p->packet.nmb;
 703         struct nmb_name *question = &nmb->question.question_name;
 704         BOOL bcast = nmb->header.nm_flags.bcast;
 705         uint16 nb_flags = get_nb_flags(nmb->additional->rdata);
 706         int ttl = get_ttl_from_packet(nmb);
 707         struct name_record *namerec = NULL;
 708         struct in_addr from_ip;
 709         BOOL registering_group_name = (nb_flags & NB_GROUP) ? True : False;
 710         struct in_addr our_fake_ip = *interpret_addr2("0.0.0.0");
 711
 712         putip((char *)&from_ip,&nmb->additional->rdata[2]);
 713
 714         if(bcast) {
 715                 /*
 716                  * We should only get unicast name registration packets here.
 717                  * Anyone trying to register broadcast should not be going to a WINS
 718                  * server. Log an error here.
 719                  */
 720
 721                 DEBUG(0,("wins_process_name_registration_request: broadcast name registration request \
 722 received for name %s from IP %s on subnet %s. Error - should not be sent to WINS server\n",
 723                         nmb_namestr(question), inet_ntoa(from_ip), subrec->subnet_name));
 724                 return;
 725         }
 726
 727         DEBUG(3,("wins_process_name_registration_request: %s name registration for name %s \
 728 IP %s\n", registering_group_name ? "Group" : "Unique", nmb_namestr(question), inet_ntoa(from_ip) ));
 729
 730         /*
 731          * See if the name already exists.
 732          */
 733
 734         namerec = find_name_on_subnet(subrec, question, FIND_ANY_NAME);
 735
 736         /*
 737          * if the record exists but NOT in active state,
 738          * consider it dead.
 739          */
 740         if ( (namerec != NULL) && !WINS_STATE_ACTIVE(namerec)) {
 741                 DEBUG(5,("wins_process_name_registration_request: Name (%s) in WINS was \
 742 not active - removing it.\n", nmb_namestr(question) ));
 743                 remove_name_from_namelist( subrec, namerec );
 744                 namerec = NULL;
 745         }
 746
 747         /*
 748          * Deal with the case where the name found was a dns entry.
 749          * Remove it as we now have a NetBIOS client registering the
 750          * name.
 751          */
 752
 753         if( (namerec != NULL) && ( (namerec->data.source == DNS_NAME) || (namerec->data.source == DNSFAIL_NAME) ) ) {
 754                 DEBUG(5,("wins_process_name_registration_request: Name (%s) in WINS was \
 755 a dns lookup - removing it.\n", nmb_namestr(question) ));
 756                 remove_name_from_namelist( subrec, namerec );
 757                 namerec = NULL;
 758         }
 759
 760         /*
 761          * Reject if the name exists and is not a REGISTER_NAME.
 762          * (ie. Don't allow any static names to be overwritten.
 763          */
 764
 765         if((namerec != NULL) && (namerec->data.source != REGISTER_NAME)) {
 766                 DEBUG( 3, ( "wins_process_name_registration_request: Attempt \
 767 to register name %s. Name already exists in WINS with source type %d.\n",
 768                         nmb_namestr(question), namerec->data.source ));
 769                 send_wins_name_registration_response(RFS_ERR, 0, p);
 770                 return;
 771         }
 772
 773         /*
 774          * Special policy decisions based on MS documentation.
 775          * 1). All group names (except names ending in 0x1c) are added as 255.255.255.255.
 776          * 2). All unique names ending in 0x1d are ignored, although a positive response is sent.
 777          */
 778
 779         /*
 780          * A group name is always added as the local broadcast address, except
 781          * for group names ending in 0x1c.
 782          * Group names with type 0x1c are registered with individual IP addresses.
 783          */
 784
 785         if(registering_group_name && (question->name_type != 0x1c))
 786                 from_ip = *interpret_addr2("255.255.255.255");
 787
 788         /*
 789          * Ignore all attempts to register a unique 0x1d name, although return success.
 790          */
 791
 792         if(!registering_group_name && (question->name_type == 0x1d)) {
 793                 DEBUG(3,("wins_process_name_registration_request: Ignoring request \
 794 to register name %s from IP %s.\n", nmb_namestr(question), inet_ntoa(p->ip) ));
 795                 send_wins_name_registration_response(0, ttl, p);
 796                 return;
 797         }
 798
 799         /*
 800          * Next two cases are the 'if statement' mentioned above.
 801          */
 802
 803         if((namerec != NULL) && NAME_GROUP(namerec)) {
 804                 if(registering_group_name) {
 805                         /*
 806                          * If we are adding a group name, the name exists and is also a group entry just add this
 807                          * IP address to it and update the ttl.
 808                          */
 809
 810                         DEBUG(3,("wins_process_name_registration_request: Adding IP %s to group name %s.\n",
 811                                 inet_ntoa(from_ip), nmb_namestr(question) ));
 812
 813                         /*
 814                          * Check the ip address is not already in the group.
 815                          */
 816
 817                         if(!find_ip_in_name_record(namerec, from_ip)) {
 818                                 add_ip_to_name_record(namerec, from_ip);
 819                                 /* we need to update the record for replication */
 820                                 get_global_id_and_update(&namerec->data.id, True);
 821
 822                                 /*
 823                                  * if the record is a replica, we must change
 824                                  * the wins owner to us to make the replication updates
 825                                  * it on the other wins servers.
 826                                  * And when the partner will receive this record,
 827                                  * it will update its own record.
 828                                  */
 829
 830                                 update_wins_owner(namerec, our_fake_ip);
 831                         }
 832                         update_name_ttl(namerec, ttl);
 833                         send_wins_name_registration_response(0, ttl, p);
 834                         return;
 835                 } else {
 836
 837                         /*
 838                          * If we are adding a unique name, the name exists in the WINS db
 839                          * and is a group name then reject the registration.
 840                          *
 841                          * explanation: groups have a higher priority than unique names.
 842                          */
 843
 844                         DEBUG(3,("wins_process_name_registration_request: Attempt to register name %s. Name \
 845 already exists in WINS as a GROUP name.\n", nmb_namestr(question) ));
 846                         send_wins_name_registration_response(RFS_ERR, 0, p);
 847                         return;
 848                 }
 849         }
 850
 851         /*
 852          * From here on down we know that if the name exists in the WINS db it is
 853          * a unique name, not a group name.
 854          */
 855
 856         /*
 857          * If the name exists and is one of our names then check the
 858          * registering IP address. If it's not one of ours then automatically
 859          * reject without doing the query - we know we will reject it.
 860          */
 861
 862         pull_ascii_nstring(name, namerec->name.name);
 863         if((namerec != NULL) && (is_myname(name)) ) {
 864                 if(!ismyip(from_ip)) {
 865                         DEBUG(3,("wins_process_name_registration_request: Attempt to register name %s. Name \
 866 is one of our (WINS server) names. Denying registration.\n", nmb_namestr(question) ));
 867                         send_wins_name_registration_response(RFS_ERR, 0, p);
 868                         return;
 869                 } else {
 870                         /*
 871                          * It's one of our names and one of our IP's - update the ttl.
 872                          */
 873                         update_name_ttl(namerec, ttl);
 874                         send_wins_name_registration_response(0, ttl, p);
 875                         wins_hook("refresh", namerec, ttl);
 876                         return;
 877                 }
 878         }
 879
 880         /*
 881          * If the name exists and it is a unique registration and the registering IP
 882          * is the same as the (single) already registered IP then just update the ttl.
 883          *
 884          * But not if the record is an active replica. IF it's a replica, it means it can be
 885          * the same client which has moved and not yet expired. So we don't update
 886          * the ttl in this case and go beyond to do a WACK and query the old client
 887          */
 888
 889         if( !registering_group_name
 890                         && (namerec != NULL)
 891                         && (namerec->data.num_ips == 1)
 892                         && ip_equal( namerec->data.ip[0], from_ip )
 893                         && ip_equal(namerec->data.wins_ip, our_fake_ip) ) {
 894                 update_name_ttl( namerec, ttl );
 895                 send_wins_name_registration_response( 0, ttl, p );
 896                 wins_hook("refresh", namerec, ttl);
 897                 return;
 898         }
 899
 900         /*
 901          * Finally if the name exists do a query to the registering machine
 902          * to see if they still claim to have the name.
 903          */
 904
 905         if( namerec != NULL ) {
 906                 long *ud[(sizeof(struct userdata_struct) + sizeof(struct packet_struct *))/sizeof(long *) + 1];
 907                 struct userdata_struct *userdata = (struct userdata_struct *)ud;
 908
 909                 /*
 910                  * First send a WACK to the registering machine.
 911                  */
 912
 913                 send_wins_wack_response(60, p);
 914
 915                 /*
 916                  * When the reply comes back we need the original packet.
 917                  * Lock this so it won't be freed and then put it into
 918                  * the userdata structure.
 919                  */
 920
 921                 p->locked = True;
 922
 923                 userdata = (struct userdata_struct *)ud;
 924
 925                 userdata->copy_fn = NULL;
 926                 userdata->free_fn = NULL;
 927                 userdata->userdata_len = sizeof(struct packet_struct *);
 928                 memcpy(userdata->data, (char *)&p, sizeof(struct packet_struct *) );
 929
 930                 /*
 931                  * Use the new call to send a query directly to an IP address.
 932                  * This sends the query directly to the IP address, and ensures
 933                  * the recursion desired flag is not set (you were right Luke :-).
 934                  * This function should *only* be called from the WINS server
 935                  * code. JRA.
 936                  */
 937
 938                 pull_ascii_nstring(name, question->name);
 939                 query_name_from_wins_server( *namerec->data.ip,
 940                                 name,
 941                                 question->name_type,
 942                                 wins_register_query_success,
 943                                 wins_register_query_fail,
 944                                 userdata );
 945                 return;
 946         }
 947
 948         /*
 949          * Name did not exist - add it.
 950          */
 951
 952         pull_ascii_nstring(name, question->name);
 953         add_name_to_subnet( subrec, name, question->name_type,
 954                         nb_flags, ttl, REGISTER_NAME, 1, &from_ip);
 955
 956         if ((namerec = find_name_on_subnet(subrec, question, FIND_ANY_NAME))) {
 957                 get_global_id_and_update(&namerec->data.id, True);
 958                 update_wins_owner(namerec, our_fake_ip);
 959                 update_wins_flag(namerec, WINS_ACTIVE);
 960                 wins_hook("add", namerec, ttl);
 961         }
 962
 963         send_wins_name_registration_response(0, ttl, p);
 964 }
 965
 966 /***********************************************************************
 967  Deal with a mutihomed name query success to the machine that
 968  requested the multihomed name registration.
 969
 970  We have a locked pointer to the original packet stashed away in the
 971  userdata pointer.
 972 ************************************************************************/
 973
 974 static void wins_multihomed_register_query_success(struct subnet_record *subrec,
 975                                              struct userdata_struct *userdata,
 976                                              struct nmb_name *question_name,
 977                                              struct in_addr ip,
 978                                              struct res_rec *answers)
 979 {
 980         struct packet_struct *orig_reg_packet;
 981         struct nmb_packet *nmb;
 982         struct name_record *namerec = NULL;
 983         struct in_addr from_ip;
 984         int ttl;
 985         struct in_addr our_fake_ip = *interpret_addr2("0.0.0.0");
 986
 987         memcpy((char *)&orig_reg_packet, userdata->data, sizeof(struct packet_struct *));
 988
 989         nmb = &orig_reg_packet->packet.nmb;
 990
 991         putip((char *)&from_ip,&nmb->additional->rdata[2]);
 992         ttl = get_ttl_from_packet(nmb);
 993
 994         /*
 995          * We want to just add the new IP, as we now know the requesting
 996          * machine claims to own it. But we can't just do that as an arbitary
 997          * amount of time may have taken place between the name query
 998          * request and this response. So we check that
 999          * the name still exists and is in the same state - if so
1000          * we just add the extra IP and update the ttl.
1001          */
1002
1003         namerec = find_name_on_subnet(subrec, question_name, FIND_ANY_NAME);
1004
1005         if( (namerec == NULL) || (namerec->data.source != REGISTER_NAME) || !WINS_STATE_ACTIVE(namerec) ) {
1006                 DEBUG(3,("wins_multihomed_register_query_success: name %s is not in the correct state to add \
1007 a subsequent IP address.\n", nmb_namestr(question_name) ));
1008                 send_wins_name_registration_response(RFS_ERR, 0, orig_reg_packet);
1009
1010                 orig_reg_packet->locked = False;
1011                 free_packet(orig_reg_packet);
1012
1013                 return;
1014         }
1015
1016         if(!find_ip_in_name_record(namerec, from_ip))
1017                 add_ip_to_name_record(namerec, from_ip);
1018
1019         get_global_id_and_update(&namerec->data.id, True);
1020         update_wins_owner(namerec, our_fake_ip);
1021         update_wins_flag(namerec, WINS_ACTIVE);
1022         update_name_ttl(namerec, ttl);
1023         send_wins_name_registration_response(0, ttl, orig_reg_packet);
1024         wins_hook("add", namerec, ttl);
1025
1026         orig_reg_packet->locked = False;
1027         free_packet(orig_reg_packet);
1028 }
1029
1030 /***********************************************************************
1031  Deal with a name registration request query failure to a client that
1032  owned the name.
1033
1034  We have a locked pointer to the original packet stashed away in the
1035  userdata pointer.
1036 ************************************************************************/
1037
1038 static void wins_multihomed_register_query_fail(struct subnet_record *subrec,
1039                                           struct response_record *rrec,
1040                                           struct nmb_name *question_name,
1041                                           int rcode)
1042 {
1043         struct userdata_struct *userdata = rrec->userdata;
1044         struct packet_struct *orig_reg_packet;
1045
1046         memcpy((char *)&orig_reg_packet, userdata->data, sizeof(struct packet_struct *));
1047
1048         DEBUG(3,("wins_multihomed_register_query_fail: Registering machine at IP %s failed to answer \
1049 query successfully for name %s.\n", inet_ntoa(orig_reg_packet->ip), nmb_namestr(question_name) ));
1050         send_wins_name_registration_response(RFS_ERR, 0, orig_reg_packet);
1051
1052         orig_reg_packet->locked = False;
1053         free_packet(orig_reg_packet);
1054         return;
1055 }
1056
1057 /***********************************************************************
1058  Deal with a multihomed name registration request to a WINS server.
1059  These cannot be group name registrations.
1060 ***********************************************************************/
1061
1062 void wins_process_multihomed_name_registration_request( struct subnet_record *subrec,
1063                                                         struct packet_struct *p)
1064 {
1065         struct nmb_packet *nmb = &p->packet.nmb;
1066         struct nmb_name *question = &nmb->question.question_name;
1067         BOOL bcast = nmb->header.nm_flags.bcast;
1068         uint16 nb_flags = get_nb_flags(nmb->additional->rdata);
1069         int ttl = get_ttl_from_packet(nmb);
1070         struct name_record *namerec = NULL;
1071         struct in_addr from_ip;
1072         BOOL group = (nb_flags & NB_GROUP) ? True : False;
1073         struct in_addr our_fake_ip = *interpret_addr2("0.0.0.0");
1074         nstring qname;
1075
1076         putip((char *)&from_ip,&nmb->additional->rdata[2]);
1077
1078         if(bcast) {
1079                 /*
1080                  * We should only get unicast name registration packets here.
1081                  * Anyone trying to register broadcast should not be going to a WINS
1082                  * server. Log an error here.
1083                  */
1084
1085                 DEBUG(0,("wins_process_multihomed_name_registration_request: broadcast name registration request \
1086 received for name %s from IP %s on subnet %s. Error - should not be sent to WINS server\n",
1087                         nmb_namestr(question), inet_ntoa(from_ip), subrec->subnet_name));
1088                 return;
1089         }
1090
1091         /*
1092          * Only unique names should be registered multihomed.
1093          */
1094
1095         if(group) {
1096                 DEBUG(0,("wins_process_multihomed_name_registration_request: group name registration request \
1097 received for name %s from IP %s on subnet %s. Errror - group names should not be multihomed.\n",
1098                         nmb_namestr(question), inet_ntoa(from_ip), subrec->subnet_name));
1099                 return;
1100         }
1101
1102         DEBUG(3,("wins_process_multihomed_name_registration_request: name registration for name %s \
1103 IP %s\n", nmb_namestr(question), inet_ntoa(from_ip) ));
1104
1105         /*
1106          * Deal with policy regarding 0x1d names.
1107          */
1108
1109         if(question->name_type == 0x1d) {
1110                 DEBUG(3,("wins_process_multihomed_name_registration_request: Ignoring request \
1111 to register name %s from IP %s.", nmb_namestr(question), inet_ntoa(p->ip) ));
1112                 send_wins_name_registration_response(0, ttl, p);
1113                 return;
1114         }
1115
1116         /*
1117          * See if the name already exists.
1118          */
1119
1120         namerec = find_name_on_subnet(subrec, question, FIND_ANY_NAME);
1121
1122         /*
1123          * if the record exists but NOT in active state,
1124          * consider it dead.
1125          */
1126
1127         if ((namerec != NULL) && !WINS_STATE_ACTIVE(namerec)) {
1128                 DEBUG(5,("wins_process_multihomed_name_registration_request: Name (%s) in WINS was not active - removing it.\n", nmb_namestr(question)));
1129                 remove_name_from_namelist(subrec, namerec);
1130                 namerec = NULL;
1131         }
1132
1133         /*
1134          * Deal with the case where the name found was a dns entry.
1135          * Remove it as we now have a NetBIOS client registering the
1136          * name.
1137          */
1138
1139         if( (namerec != NULL) && ( (namerec->data.source == DNS_NAME) || (namerec->data.source == DNSFAIL_NAME) ) ) {
1140                 DEBUG(5,("wins_process_multihomed_name_registration_request: Name (%s) in WINS was a dns lookup \
1141 - removing it.\n", nmb_namestr(question) ));
1142                 remove_name_from_namelist( subrec, namerec);
1143                 namerec = NULL;
1144         }
1145
1146         /*
1147          * Reject if the name exists and is not a REGISTER_NAME.
1148          * (ie. Don't allow any static names to be overwritten.
1149          */
1150
1151         if( (namerec != NULL) && (namerec->data.source != REGISTER_NAME) ) {
1152                 DEBUG( 3, ( "wins_process_multihomed_name_registration_request: Attempt \
1153 to register name %s. Name already exists in WINS with source type %d.\n",
1154                         nmb_namestr(question), namerec->data.source ));
1155                 send_wins_name_registration_response(RFS_ERR, 0, p);
1156                 return;
1157         }
1158
1159         /*
1160          * Reject if the name exists and is a GROUP name and is active.
1161          */
1162
1163         if((namerec != NULL) && NAME_GROUP(namerec) && WINS_STATE_ACTIVE(namerec)) {
1164                 DEBUG(3,("wins_process_multihomed_name_registration_request: Attempt to register name %s. Name \
1165 already exists in WINS as a GROUP name.\n", nmb_namestr(question) ));
1166                 send_wins_name_registration_response(RFS_ERR, 0, p);
1167                 return;
1168         }
1169
1170         /*
1171          * From here on down we know that if the name exists in the WINS db it is
1172          * a unique name, not a group name.
1173          */
1174
1175         /*
1176          * If the name exists and is one of our names then check the
1177          * registering IP address. If it's not one of ours then automatically
1178          * reject without doing the query - we know we will reject it.
1179          */
1180
1181         if((namerec != NULL) && (is_myname(namerec->name.name)) ) {
1182                 if(!ismyip(from_ip)) {
1183                         DEBUG(3,("wins_process_multihomed_name_registration_request: Attempt to register name %s. Name \
1184 is one of our (WINS server) names. Denying registration.\n", nmb_namestr(question) ));
1185                         send_wins_name_registration_response(RFS_ERR, 0, p);
1186                         return;
1187                 } else {
1188                         /*
1189                          * It's one of our names and one of our IP's. Ensure the IP is in the record and
1190                          *  update the ttl. Update the version ID to force replication.
1191                          */
1192                         if(!find_ip_in_name_record(namerec, from_ip)) {
1193                                 get_global_id_and_update(&namerec->data.id, True);
1194                                 update_wins_owner(namerec, our_fake_ip);
1195                                 update_wins_flag(namerec, WINS_ACTIVE);
1196
1197                                 add_ip_to_name_record(namerec, from_ip);
1198                                 wins_hook("add", namerec, ttl);
1199                         } else {
1200                                 wins_hook("refresh", namerec, ttl);
1201                         }
1202
1203                         update_name_ttl(namerec, ttl);
1204                         send_wins_name_registration_response(0, ttl, p);
1205                         return;
1206                 }
1207         }
1208
1209         /*
1210          * If the name exists and is active, check if the IP address is already registered
1211          * to that name. If so then update the ttl and reply success.
1212          */
1213
1214         if((namerec != NULL) && find_ip_in_name_record(namerec, from_ip) && WINS_STATE_ACTIVE(namerec)) {
1215                 update_name_ttl(namerec, ttl);
1216
1217                 /*
1218                  * If it's a replica, we need to become the wins owner
1219                  * to force the replication
1220                  */
1221                 if (!ip_equal(namerec->data.wins_ip, our_fake_ip)) {
1222                         get_global_id_and_update(&namerec->data.id, True);
1223                         update_wins_owner(namerec, our_fake_ip);
1224                         update_wins_flag(namerec, WINS_ACTIVE);
1225                 }
1226
1227                 send_wins_name_registration_response(0, ttl, p);
1228                 wins_hook("refresh", namerec, ttl);
1229                 return;
1230         }
1231
1232         /*
1233          * If the name exists do a query to the owner
1234          * to see if they still want the name.
1235          */
1236
1237         if(namerec != NULL) {
1238                 long *ud[(sizeof(struct userdata_struct) + sizeof(struct packet_struct *))/sizeof(long *) + 1];
1239                 struct userdata_struct *userdata = (struct userdata_struct *)ud;
1240
1241                 /*
1242                  * First send a WACK to the registering machine.
1243                  */
1244
1245                 send_wins_wack_response(60, p);
1246
1247                 /*
1248                  * When the reply comes back we need the original packet.
1249                  * Lock this so it won't be freed and then put it into
1250                  * the userdata structure.
1251                  */
1252
1253                 p->locked = True;
1254
1255                 userdata = (struct userdata_struct *)ud;
1256
1257                 userdata->copy_fn = NULL;
1258                 userdata->free_fn = NULL;
1259                 userdata->userdata_len = sizeof(struct packet_struct *);
1260                 memcpy(userdata->data, (char *)&p, sizeof(struct packet_struct *) );
1261
1262                 /*
1263                  * Use the new call to send a query directly to an IP address.
1264                  * This sends the query directly to the IP address, and ensures
1265                  * the recursion desired flag is not set (you were right Luke :-).
1266                  * This function should *only* be called from the WINS server
1267                  * code. JRA.
1268                  *
1269                  * Note that this packet is sent to the current owner of the name,
1270                  * not the person who sent the packet
1271                  */
1272
1273                 pull_ascii_nstring( qname, question->name);
1274                 query_name_from_wins_server( namerec->data.ip[0],
1275                                 qname,
1276                                 question->name_type,
1277                                 wins_multihomed_register_query_success,
1278                                 wins_multihomed_register_query_fail,
1279                                 userdata );
1280
1281                 return;
1282         }
1283
1284         /*
1285          * Name did not exist - add it.
1286          */
1287
1288         pull_ascii_nstring( qname, question->name);
1289         add_name_to_subnet( subrec, qname, question->name_type,
1290                         nb_flags, ttl, REGISTER_NAME, 1, &from_ip);
1291
1292         if ((namerec = find_name_on_subnet(subrec, question, FIND_ANY_NAME))) {
1293                 get_global_id_and_update(&namerec->data.id, True);
1294                 update_wins_owner(namerec, our_fake_ip);
1295                 update_wins_flag(namerec, WINS_ACTIVE);
1296                 wins_hook("add", namerec, ttl);
1297         }
1298
1299         send_wins_name_registration_response(0, ttl, p);
1300 }
1301
1302 /***********************************************************************
1303  Deal with the special name query for *<1b>.
1304 ***********************************************************************/
1305
1306 static void process_wins_dmb_query_request(struct subnet_record *subrec,
1307                                            struct packet_struct *p)
1308 {
1309         struct name_record *namerec = NULL;
1310         char *prdata;
1311         int num_ips;
1312
1313         /*
1314          * Go through all the ACTIVE names in the WINS db looking for those
1315          * ending in <1b>. Use this to calculate the number of IP
1316          * addresses we need to return.
1317          */
1318
1319         num_ips = 0;
1320         for( namerec = (struct name_record *)ubi_trFirst( subrec->namelist );
1321                         namerec; namerec = (struct name_record *)ubi_trNext( namerec ) ) {
1322                 if(WINS_STATE_ACTIVE(namerec) && namerec->name.name_type == 0x1b )
1323                         num_ips += namerec->data.num_ips;
1324         }
1325
1326         if(num_ips == 0) {
1327                 /*
1328                  * There are no 0x1b names registered. Return name query fail.
1329                  */
1330                 send_wins_name_query_response(NAM_ERR, p, NULL);
1331                 return;
1332         }
1333
1334         if((prdata = (char *)malloc( num_ips * 6 )) == NULL) {
1335                 DEBUG(0,("process_wins_dmb_query_request: Malloc fail !.\n"));
1336                 return;
1337         }
1338
1339         /*
1340          * Go through all the names again in the WINS db looking for those
1341          * ending in <1b>. Add their IP addresses into the list we will
1342          * return.
1343          */
1344
1345         num_ips = 0;
1346         for( namerec = (struct name_record *)ubi_trFirst( subrec->namelist );
1347                         namerec; namerec = (struct name_record *)ubi_trNext( namerec ) ) {
1348                 if(WINS_STATE_ACTIVE(namerec) && namerec->name.name_type == 0x1b) {
1349                         int i;
1350                         for(i = 0; i < namerec->data.num_ips; i++) {
1351                                 set_nb_flags(&prdata[num_ips * 6],namerec->data.nb_flags);
1352                                 putip((char *)&prdata[(num_ips * 6) + 2], &namerec->data.ip[i]);
1353                                 num_ips++;
1354                         }
1355                 }
1356         }
1357
1358         /*
1359          * Send back the reply containing the IP list.
1360          */
1361
1362         reply_netbios_packet(p,                                /* Packet to reply to. */
1363                                 0,                             /* Result code. */
1364                                 WINS_QUERY,                    /* nmbd type code. */
1365                                 NMB_NAME_QUERY_OPCODE,         /* opcode. */
1366                                 lp_min_wins_ttl(),             /* ttl. */
1367                                 prdata,                        /* data to send. */
1368                                 num_ips*6);                    /* data length. */
1369
1370         SAFE_FREE(prdata);
1371 }
1372
1373 /****************************************************************************
1374 Send a WINS name query response.
1375 **************************************************************************/
1376
1377 void send_wins_name_query_response(int rcode, struct packet_struct *p,
1378                                           struct name_record *namerec)
1379 {
1380         char rdata[6];
1381         char *prdata = rdata;
1382         int reply_data_len = 0;
1383         int ttl = 0;
1384         int i;
1385
1386         memset(rdata,'\0',6);
1387
1388         if(rcode == 0) {
1389                 ttl = (namerec->data.death_time != PERMANENT_TTL) ?  namerec->data.death_time - p->timestamp : lp_max_wins_ttl();
1390
1391                 /* Copy all known ip addresses into the return data. */
1392                 /* Optimise for the common case of one IP address so we don't need a malloc. */
1393
1394                 if( namerec->data.num_ips == 1 ) {
1395                         prdata = rdata;
1396                 } else {
1397                         if((prdata = (char *)malloc( namerec->data.num_ips * 6 )) == NULL) {
1398                                 DEBUG(0,("send_wins_name_query_response: malloc fail !\n"));
1399                                 return;
1400                         }
1401                 }
1402
1403                 for(i = 0; i < namerec->data.num_ips; i++) {
1404                         set_nb_flags(&prdata[i*6],namerec->data.nb_flags);
1405                         putip((char *)&prdata[2+(i*6)], &namerec->data.ip[i]);
1406                 }
1407
1408                 sort_query_replies(prdata, i, p->ip);
1409                 reply_data_len = namerec->data.num_ips * 6;
1410         }
1411
1412         reply_netbios_packet(p,                                /* Packet to reply to. */
1413                                 rcode,                         /* Result code. */
1414                                 WINS_QUERY,                    /* nmbd type code. */
1415                                 NMB_NAME_QUERY_OPCODE,         /* opcode. */
1416                                 ttl,                           /* ttl. */
1417                                 prdata,                        /* data to send. */
1418                                 reply_data_len);               /* data length. */
1419
1420         if(prdata != rdata)
1421                 SAFE_FREE(prdata);
1422 }
1423
1424 /***********************************************************************
1425  Deal with a name query.
1426 ***********************************************************************/
1427
1428 void wins_process_name_query_request(struct subnet_record *subrec,
1429                                      struct packet_struct *p)
1430 {
1431         struct nmb_packet *nmb = &p->packet.nmb;
1432         struct nmb_name *question = &nmb->question.question_name;
1433         struct name_record *namerec = NULL;
1434         nstring qname;
1435
1436         DEBUG(3,("wins_process_name_query: name query for name %s from IP %s\n",
1437                 nmb_namestr(question), inet_ntoa(p->ip) ));
1438
1439         /*
1440          * Special name code. If the queried name is *<1b> then search
1441          * the entire WINS database and return a list of all the IP addresses
1442          * registered to any <1b> name. This is to allow domain master browsers
1443          * to discover other domains that may not have a presence on their subnet.
1444          */
1445
1446         pull_ascii_nstring(qname, question->name);
1447         if(strequal( qname, "*") && (question->name_type == 0x1b)) {
1448                 process_wins_dmb_query_request( subrec, p);
1449                 return;
1450         }
1451
1452         namerec = find_name_on_subnet(subrec, question, FIND_ANY_NAME);
1453
1454         if(namerec != NULL) {
1455                 /*
1456                  * If the name is not anymore in active state then reply not found.
1457                  * it's fair even if we keep it in the cache for days.
1458                  */
1459                 if (!WINS_STATE_ACTIVE(namerec)) {
1460                         DEBUG(3,("wins_process_name_query: name query for name %s - name expired. Returning fail.\n",
1461                                 nmb_namestr(question) ));
1462                         send_wins_name_query_response(NAM_ERR, p, namerec);
1463                         return;
1464                 }
1465
1466                 /*
1467                  * If it's a DNSFAIL_NAME then reply name not found.
1468                  */
1469
1470                 if( namerec->data.source == DNSFAIL_NAME ) {
1471                         DEBUG(3,("wins_process_name_query: name query for name %s returning DNS fail.\n",
1472                                 nmb_namestr(question) ));
1473                         send_wins_name_query_response(NAM_ERR, p, namerec);
1474                         return;
1475                 }
1476
1477                 /*
1478                  * If the name has expired then reply name not found.
1479                  */
1480
1481                 if( (namerec->data.death_time != PERMANENT_TTL) && (namerec->data.death_time < p->timestamp) ) {
1482                         DEBUG(3,("wins_process_name_query: name query for name %s - name expired. Returning fail.\n",
1483                                         nmb_namestr(question) ));
1484                         send_wins_name_query_response(NAM_ERR, p, namerec);
1485                         return;
1486                 }
1487
1488                 DEBUG(3,("wins_process_name_query: name query for name %s returning first IP %s.\n",
1489                                 nmb_namestr(question), inet_ntoa(namerec->data.ip[0]) ));
1490
1491                 send_wins_name_query_response(0, p, namerec);
1492                 return;
1493         }
1494
1495         /*
1496          * Name not found in WINS - try a dns query if it's a 0x20 name.
1497          */
1498
1499         if(lp_dns_proxy() && ((question->name_type == 0x20) || question->name_type == 0)) {
1500                 DEBUG(3,("wins_process_name_query: name query for name %s not found - doing dns lookup.\n",
1501                                 nmb_namestr(question) ));
1502
1503                 queue_dns_query(p, question, &namerec);
1504                 return;
1505         }
1506
1507         /*
1508          * Name not found - return error.
1509          */
1510
1511         send_wins_name_query_response(NAM_ERR, p, NULL);
1512 }
1513
1514 /****************************************************************************
1515 Send a WINS name release response.
1516 **************************************************************************/
1517
1518 static void send_wins_name_release_response(int rcode, struct packet_struct *p)
1519 {
1520         struct nmb_packet *nmb = &p->packet.nmb;
1521         char rdata[6];
1522
1523         memcpy(&rdata[0], &nmb->additional->rdata[0], 6);
1524
1525         reply_netbios_packet(p,                               /* Packet to reply to. */
1526                                 rcode,                        /* Result code. */
1527                                 NMB_REL,                      /* nmbd type code. */
1528                                 NMB_NAME_RELEASE_OPCODE,      /* opcode. */
1529                                 0,                            /* ttl. */
1530                                 rdata,                        /* data to send. */
1531                                 6);                           /* data length. */
1532 }
1533
1534 /***********************************************************************
1535  Deal with a name release.
1536 ***********************************************************************/
1537
1538 void wins_process_name_release_request(struct subnet_record *subrec,
1539                                        struct packet_struct *p)
1540 {
1541         struct nmb_packet *nmb = &p->packet.nmb;
1542         struct nmb_name *question = &nmb->question.question_name;
1543         BOOL bcast = nmb->header.nm_flags.bcast;
1544         uint16 nb_flags = get_nb_flags(nmb->additional->rdata);
1545         struct name_record *namerec = NULL;
1546         struct in_addr from_ip;
1547         BOOL releasing_group_name = (nb_flags & NB_GROUP) ? True : False;;
1548
1549         putip((char *)&from_ip,&nmb->additional->rdata[2]);
1550
1551         if(bcast) {
1552                 /*
1553                  * We should only get unicast name registration packets here.
1554                  * Anyone trying to register broadcast should not be going to a WINS
1555                  * server. Log an error here.
1556                  */
1557
1558                 DEBUG(0,("wins_process_name_release_request: broadcast name registration request \
1559 received for name %s from IP %s on subnet %s. Error - should not be sent to WINS server\n",
1560                         nmb_namestr(question), inet_ntoa(from_ip), subrec->subnet_name));
1561                 return;
1562         }
1563
1564         DEBUG(3,("wins_process_name_release_request: %s name release for name %s \
1565 IP %s\n", releasing_group_name ? "Group" : "Unique", nmb_namestr(question), inet_ntoa(from_ip) ));
1566
1567         /*
1568          * Deal with policy regarding 0x1d names.
1569          */
1570
1571         if(!releasing_group_name && (question->name_type == 0x1d)) {
1572                 DEBUG(3,("wins_process_name_release_request: Ignoring request \
1573 to release name %s from IP %s.", nmb_namestr(question), inet_ntoa(p->ip) ));
1574                 send_wins_name_release_response(0, p);
1575                 return;
1576         }
1577
1578         /*
1579          * See if the name already exists.
1580          */
1581
1582         namerec = find_name_on_subnet(subrec, question, FIND_ANY_NAME);
1583
1584         if( (namerec == NULL) || ((namerec != NULL) && (namerec->data.source != REGISTER_NAME)) ) {
1585                 send_wins_name_release_response(NAM_ERR, p);
1586                 return;
1587         }
1588
1589         /*
1590          * Check that the sending machine has permission to release this name.
1591          * If it's a group name not ending in 0x1c then just say yes and let
1592          * the group time out.
1593          */
1594
1595         if(releasing_group_name && (question->name_type != 0x1c)) {
1596                 send_wins_name_release_response(0, p);
1597                 return;
1598         }
1599
1600         /*
1601          * Check that the releasing node is on the list of IP addresses
1602          * for this name. Disallow the release if not.
1603          */
1604
1605         if(!find_ip_in_name_record(namerec, from_ip)) {
1606                 DEBUG(3,("wins_process_name_release_request: Refusing request to \
1607 release name %s as IP %s is not one of the known IP's for this name.\n",
1608                         nmb_namestr(question), inet_ntoa(from_ip) ));
1609                 send_wins_name_release_response(NAM_ERR, p);
1610                 return;
1611         }
1612
1613         /*
1614          * Check if the record is active. IF it's already released
1615          * or tombstoned, refuse the release.
1616          */
1617
1618         if (!WINS_STATE_ACTIVE(namerec)) {
1619                 DEBUG(3,("wins_process_name_release_request: Refusing request to \
1620 release name %s as this record is not active anymore.\n", nmb_namestr(question) ));
1621                 send_wins_name_release_response(NAM_ERR, p);
1622                 return;
1623         }
1624
1625         /*
1626          * Check if the record is a 0x1c group
1627          * and has more then one ip
1628          * remove only this address.
1629          */
1630
1631         if(releasing_group_name && (question->name_type == 0x1c) && (namerec->data.num_ips > 1)) {
1632                 remove_ip_from_name_record(namerec, from_ip);
1633                 DEBUG(3,("wins_process_name_release_request: Remove IP %s from NAME: %s\n",
1634                                 inet_ntoa(from_ip),nmb_namestr(question)));
1635                 send_wins_name_release_response(0, p);
1636                 return;
1637         }
1638
1639         /*
1640          * Send a release response.
1641          * Flag the name as released and update the ttl
1642          */
1643
1644         send_wins_name_release_response(0, p);
1645
1646         namerec->data.wins_flags |= WINS_RELEASED;
1647         update_name_ttl(namerec, EXTINCTION_INTERVAL);
1648
1649         wins_hook("delete", namerec, 0);
1650 }
1651
1652 /*******************************************************************
1653  WINS time dependent processing.
1654 ******************************************************************/
1655
1656 void initiate_wins_processing(time_t t)
1657 {
1658         static time_t lasttime = 0;
1659         struct name_record *namerec;
1660         struct name_record *next_namerec;
1661         struct in_addr our_fake_ip = *interpret_addr2("0.0.0.0");
1662
1663         if (!lasttime)
1664                 lasttime = t;
1665         if (t - lasttime < 20)
1666                 return;
1667
1668         lasttime = t;
1669
1670         if(!lp_we_are_a_wins_server())
1671                 return;
1672
1673         for( namerec = (struct name_record *)ubi_trFirst( wins_server_subnet->namelist );
1674              namerec;
1675              namerec = next_namerec ) {
1676                 next_namerec = (struct name_record *)ubi_trNext( namerec );
1677
1678                 if( (namerec->data.death_time != PERMANENT_TTL)
1679                      && (namerec->data.death_time < t) ) {
1680
1681                         if( namerec->data.source == SELF_NAME ) {
1682                                 DEBUG( 3, ( "expire_names_on_subnet: Subnet %s not expiring SELF name %s\n",
1683                                            wins_server_subnet->subnet_name, nmb_namestr(&namerec->name) ) );
1684                                 namerec->data.death_time += 300;
1685                                 namerec->subnet->namelist_changed = True;
1686                                 continue;
1687                         }
1688
1689                         /* handle records, samba is the wins owner */
1690                         if (ip_equal(namerec->data.wins_ip, our_fake_ip)) {
1691                                 switch (namerec->data.wins_flags | WINS_STATE_MASK) {
1692                                         case WINS_ACTIVE:
1693                                                 namerec->data.wins_flags&=~WINS_STATE_MASK;
1694                                                 namerec->data.wins_flags|=WINS_RELEASED;
1695                                                 namerec->data.death_time = t + EXTINCTION_INTERVAL;
1696                                                 DEBUG(3,("initiate_wins_processing: expiring %s\n", nmb_namestr(&namerec->name)));
1697                                                 break;
1698                                         case WINS_RELEASED:
1699                                                 namerec->data.wins_flags&=~WINS_STATE_MASK;
1700                                                 namerec->data.wins_flags|=WINS_TOMBSTONED;
1701                                                 namerec->data.death_time = t + EXTINCTION_TIMEOUT;
1702                                                 get_global_id_and_update(&namerec->data.id, True);
1703                                                 DEBUG(3,("initiate_wins_processing: tombstoning %s\n", nmb_namestr(&namerec->name)));
1704                                                 break;
1705                                         case WINS_TOMBSTONED:
1706                                                 DEBUG(3,("initiate_wins_processing: deleting %s\n", nmb_namestr(&namerec->name)));
1707                                                 remove_name_from_namelist( wins_server_subnet, namerec );
1708                                                 break;
1709                                 }
1710                         } else {
1711                                 switch (namerec->data.wins_flags | WINS_STATE_MASK) {
1712                                         case WINS_ACTIVE:
1713                                                 /* that's not as MS says it should be */
1714                                                 namerec->data.wins_flags&=~WINS_STATE_MASK;
1715                                                 namerec->data.wins_flags|=WINS_TOMBSTONED;
1716                                                 namerec->data.death_time = t + EXTINCTION_TIMEOUT;
1717                                                 DEBUG(3,("initiate_wins_processing: tombstoning %s\n", nmb_namestr(&namerec->name)));
1718                                         case WINS_TOMBSTONED:
1719                                                 DEBUG(3,("initiate_wins_processing: deleting %s\n", nmb_namestr(&namerec->name)));
1720                                                 remove_name_from_namelist( wins_server_subnet, namerec );
1721                                                 break;
1722                                         case WINS_RELEASED:
1723                                                 DEBUG(0,("initiate_wins_processing: %s is in released state and\
1724 we are not the wins owner !\n", nmb_namestr(&namerec->name)));
1725                                                 break;
1726                                 }
1727                         }
1728
1729                 }
1730         }
1731
1732         if(wins_server_subnet->namelist_changed)
1733                 wins_write_database(True);
1734
1735         wins_server_subnet->namelist_changed = False;
1736 }
1737
1738 /*******************************************************************
1739  Write out the current WINS database.
1740 ******************************************************************/
1741
1742 void wins_write_database(BOOL background)
1743 {
1744         struct name_record *namerec;
1745         pstring fname, fnamenew;
1746
1747         XFILE *fp;
1748
1749         if(!lp_we_are_a_wins_server())
1750                 return;
1751
1752         /* We will do the writing in a child process to ensure that the parent doesn't block while this is done */
1753         if (background) {
1754                 CatchChild();
1755                 if (sys_fork()) {
1756                         return;
1757                 }
1758         }
1759
1760         slprintf(fname,sizeof(fname)-1,"%s/%s", lp_lockdir(), WINS_LIST);
1761         all_string_sub(fname,"//", "/", 0);
1762         slprintf(fnamenew,sizeof(fnamenew)-1,"%s.%u", fname, (unsigned int)sys_getpid());
1763
1764         if((fp = x_fopen(fnamenew,O_WRONLY|O_CREAT,0644)) == NULL) {
1765                 DEBUG(0,("wins_write_database: Can't open %s. Error was %s\n", fnamenew, strerror(errno)));
1766                 if (background) {
1767                         _exit(0);
1768                 }
1769                 return;
1770         }
1771
1772         DEBUG(4,("wins_write_database: Dump of WINS name list.\n"));
1773
1774         x_fprintf(fp,"VERSION %d %u\n", WINS_VERSION, 0);
1775
1776         for( namerec = (struct name_record *)ubi_trFirst( wins_server_subnet->namelist ); namerec; namerec = (struct name_record *)ubi_trNext( namerec ) ) {
1777                 int i;
1778                 struct tm *tm;
1779
1780                 DEBUGADD(4,("%-19s ", nmb_namestr(&namerec->name) ));
1781
1782                 if( namerec->data.death_time != PERMANENT_TTL ) {
1783                         char *ts, *nl;
1784
1785                         tm = LocalTime(&namerec->data.death_time);
1786                         ts = asctime(tm);
1787                         nl = strrchr( ts, '\n' );
1788                         if( NULL != nl )
1789                                 *nl = '\0';
1790                         DEBUGADD(4,("TTL = %s  ", ts ));
1791                 } else {
1792                         DEBUGADD(4,("TTL = PERMANENT                 "));
1793                 }
1794
1795                 for (i = 0; i < namerec->data.num_ips; i++)
1796                         DEBUGADD(4,("%15s ", inet_ntoa(namerec->data.ip[i]) ));
1797                 DEBUGADD(4,("%2x\n", namerec->data.nb_flags ));
1798
1799                 if( namerec->data.source == REGISTER_NAME ) {
1800                         nstring name;
1801                         pull_ascii_nstring(name, namerec->name.name);
1802                         x_fprintf(fp, "\"%s#%02x\" %d ", name,namerec->name.name_type, /* Ignore scope. */
1803                                 (int)namerec->data.death_time);
1804
1805                         for (i = 0; i < namerec->data.num_ips; i++)
1806                                 x_fprintf( fp, "%s ", inet_ntoa( namerec->data.ip[i] ) );
1807                         x_fprintf( fp, "%2xR\n", namerec->data.nb_flags );
1808                 }
1809         }
1810
1811         x_fclose(fp);
1812         chmod(fnamenew,0644);
1813         unlink(fname);
1814         rename(fnamenew,fname);
1815         if (background) {
1816                 _exit(0);
1817         }
1818 }
1819
1820 /****************************************************************************
1821  Process a internal Samba message receiving a wins record.
1822 ***************************************************************************/
1823
1824 void nmbd_wins_new_entry(int msg_type, pid_t src, void *buf, size_t len)
1825 {
1826         WINS_RECORD *record;
1827         struct name_record *namerec = NULL;
1828         struct name_record *new_namerec = NULL;
1829         struct nmb_name question;
1830         BOOL overwrite=False;
1831         struct in_addr our_fake_ip = *interpret_addr2("0.0.0.0");
1832         int i;
1833
1834         if (buf==NULL)
1835                 return;
1836
1837         /* Record should use UNIX codepage. Ensure this is so in the wrepld code. JRA. */
1838         record=(WINS_RECORD *)buf;
1839
1840         make_nmb_name(&question, record->name, record->type);
1841
1842         namerec = find_name_on_subnet(wins_server_subnet, &question, FIND_ANY_NAME);
1843
1844         /* record doesn't exist, add it */
1845         if (namerec == NULL) {
1846                 DEBUG(3,("nmbd_wins_new_entry: adding new replicated record: %s<%02x> for wins server: %s\n",
1847                           record->name, record->type, inet_ntoa(record->wins_ip)));
1848
1849                 new_namerec=add_name_to_subnet( wins_server_subnet, record->name, record->type, record->nb_flags,
1850                                                 EXTINCTION_INTERVAL, REGISTER_NAME, record->num_ips, record->ip);
1851                 if (new_namerec!=NULL) {
1852                                 update_wins_owner(new_namerec, record->wins_ip);
1853                                 update_wins_flag(new_namerec, record->wins_flags);
1854                                 new_namerec->data.id=record->id;
1855
1856                                 wins_server_subnet->namelist_changed = True;
1857                         }
1858         }
1859
1860         /* check if we have a conflict */
1861         if (namerec != NULL) {
1862                 /* both records are UNIQUE */
1863                 if (namerec->data.wins_flags&WINS_UNIQUE && record->wins_flags&WINS_UNIQUE) {
1864
1865                         /* the database record is a replica */
1866                         if (!ip_equal(namerec->data.wins_ip, our_fake_ip)) {
1867                                 if (namerec->data.wins_flags&WINS_ACTIVE && record->wins_flags&WINS_TOMBSTONED) {
1868                                         if (ip_equal(namerec->data.wins_ip, record->wins_ip))
1869                                                 overwrite=True;
1870                                 } else
1871                                         overwrite=True;
1872                         } else {
1873                         /* we are the wins owner of the database record */
1874                                 /* the 2 records have the same IP address */
1875                                 if (ip_equal(namerec->data.ip[0], record->ip[0])) {
1876                                         if (namerec->data.wins_flags&WINS_ACTIVE && record->wins_flags&WINS_TOMBSTONED)
1877                                                 get_global_id_and_update(&namerec->data.id, True);
1878                                         else
1879                                                 overwrite=True;
1880
1881                                 } else {
1882                                 /* the 2 records have different IP address */
1883                                         if (namerec->data.wins_flags&WINS_ACTIVE) {
1884                                                 if (record->wins_flags&WINS_TOMBSTONED)
1885                                                         get_global_id_and_update(&namerec->data.id, True);
1886                                                 if (record->wins_flags&WINS_ACTIVE)
1887                                                         /* send conflict challenge to the replica node */
1888                                                         ;
1889                                         } else
1890                                                 overwrite=True;
1891                                 }
1892
1893                         }
1894                 }
1895
1896                 /* the replica is a standard group */
1897                 if (record->wins_flags&WINS_NGROUP || record->wins_flags&WINS_SGROUP) {
1898                         /* if the database record is unique and active force a name release */
1899                         if (namerec->data.wins_flags&WINS_UNIQUE)
1900                                 /* send a release name to the unique node */
1901                                 ;
1902                         overwrite=True;
1903
1904                 }
1905
1906                 /* the replica is a special group */
1907                 if (record->wins_flags&WINS_SGROUP && namerec->data.wins_flags&WINS_SGROUP) {
1908                         if (namerec->data.wins_flags&WINS_ACTIVE) {
1909                                 for (i=0; i<record->num_ips; i++)
1910                                         if(!find_ip_in_name_record(namerec, record->ip[i]))
1911                                                 add_ip_to_name_record(namerec, record->ip[i]);
1912                         } else {
1913                                 overwrite=True;
1914                         }
1915                 }
1916
1917                 /* the replica is a multihomed host */
1918
1919                 /* I'm giving up on multi homed. Too much complex to understand */
1920
1921                 if (record->wins_flags&WINS_MHOMED) {
1922                         if (! (namerec->data.wins_flags&WINS_ACTIVE)) {
1923                                 if ( !(namerec->data.wins_flags&WINS_RELEASED) && !(namerec->data.wins_flags&WINS_NGROUP))
1924                                         overwrite=True;
1925                         }
1926                         else {
1927                                 if (ip_equal(record->wins_ip, namerec->data.wins_ip))
1928                                         overwrite=True;
1929
1930                                 if (ip_equal(namerec->data.wins_ip, our_fake_ip))
1931                                         if (namerec->data.wins_flags&WINS_UNIQUE)
1932                                                 get_global_id_and_update(&namerec->data.id, True);
1933
1934                         }
1935
1936                         if (record->wins_flags&WINS_ACTIVE && namerec->data.wins_flags&WINS_ACTIVE)
1937                                 if (namerec->data.wins_flags&WINS_UNIQUE ||
1938                                     namerec->data.wins_flags&WINS_MHOMED)
1939                                         if (ip_equal(record->wins_ip, namerec->data.wins_ip))
1940                                                 overwrite=True;
1941
1942                 }
1943
1944                 if (overwrite == False)
1945                         DEBUG(3, ("nmbd_wins_new_entry: conflict in adding record: %s<%02x> from wins server: %s\n",
1946                                   record->name, record->type, inet_ntoa(record->wins_ip)));
1947                 else {
1948                         DEBUG(3, ("nmbd_wins_new_entry: replacing record: %s<%02x> from wins server: %s\n",
1949                                   record->name, record->type, inet_ntoa(record->wins_ip)));
1950
1951                         /* remove the old record and add a new one */
1952                         remove_name_from_namelist( wins_server_subnet, namerec );
1953                         new_namerec=add_name_to_subnet( wins_server_subnet, record->name, record->type, record->nb_flags,
1954                                                 EXTINCTION_INTERVAL, REGISTER_NAME, record->num_ips, record->ip);
1955                         if (new_namerec!=NULL) {
1956                                 update_wins_owner(new_namerec, record->wins_ip);
1957                                 update_wins_flag(new_namerec, record->wins_flags);
1958                                 new_namerec->data.id=record->id;
1959
1960                                 wins_server_subnet->namelist_changed = True;
1961                         }
1962
1963                         wins_server_subnet->namelist_changed = True;
1964                 }
1965
1966         }
1967 }