source/wrepld/process.c

   1 /*
   2    Unix SMB/CIFS implementation.
   3    process incoming packets - main loop
   4    Copyright (C) Jean François Micouleau      1998-2002.
   5
   6    This program is free software; you can redistribute it and/or modify
   7    it under the terms of the GNU General Public License as published by
   8    the Free Software Foundation; either version 2 of the License, or
   9    (at your option) any later version.
  10
  11    This program is distributed in the hope that it will be useful,
  12    but WITHOUT ANY WARRANTY; without even the implied warranty of
  13    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  14    GNU General Public License for more details.
  15
  16    You should have received a copy of the GNU General Public License
  17    along with this program; if not, write to the Free Software
  18    Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
  19 */
  20
  21 #include "includes.h"
  22 #include "wins_repl.h"
  23
  24 extern fd_set *listen_set;
  25 extern int listen_number;
  26 extern int *sock_array;
  27
  28 WINS_OWNER global_wins_table[64][64];
  29 int partner_count;
  30
  31 TALLOC_CTX *mem_ctx;
  32
  33 #define WINS_LIST "wins.tdb"
  34 #define INFO_VERSION    "INFO/version"
  35 #define INFO_COUNT      "INFO/num_entries"
  36 #define INFO_ID_HIGH    "INFO/id_high"
  37 #define INFO_ID_LOW     "INFO/id_low"
  38 #define ENTRY_PREFIX    "ENTRY/"
  39
  40
  41 /*******************************************************************
  42 fill the header of a reply.
  43 ********************************************************************/
  44 static void fill_header(GENERIC_PACKET *g, int opcode, int ctx, int mess)
  45 {
  46         if (g==NULL)
  47                 return;
  48
  49         g->header.opcode=opcode;
  50         g->header.assoc_ctx=ctx;
  51         g->header.mess_type=mess;
  52 }
  53
  54 /*******************************************************************
  55 dump the global table, that's a debug code.
  56 ********************************************************************/
  57 static void dump_global_table(void)
  58 {
  59         int i,j;
  60
  61         for (i=0;i<partner_count;i++) {
  62                 DEBUG(0,("\n%d ", i));
  63                 for (j=0; global_wins_table[i][j].address.s_addr!=0; j++)
  64                         DEBUG(0,("%s:%d \t", inet_ntoa(global_wins_table[i][j].address),
  65                                 (int)global_wins_table[i][j].max_version));
  66         }
  67         DEBUG(0,("\n"));
  68 }
  69
  70 /*******************************************************************
  71 start association
  72 ********************************************************************/
  73 static void start_assoc_process(GENERIC_PACKET *q, GENERIC_PACKET *r)
  74 {
  75         /*
  76          * add this request to our current wins partners list
  77          * this list is used to know with who we are in contact
  78          *
  79          */
  80         r->sa_rp.assoc_ctx=time(NULL);
  81         fill_header(r, OPCODE_NON_NBT, q->sa_rq.assoc_ctx, MESSAGE_TYPE_START_ASSOC_REPLY);
  82
  83         /* reply we are a NT4 server */
  84
  85         /* w2K is min=2, maj=5 */
  86
  87         r->sa_rp.min_ver=1;
  88         r->sa_rp.maj_ver=1;
  89
  90         add_partner(r->sa_rp.assoc_ctx, q->sa_rq.assoc_ctx, False, False);
  91 }
  92
  93 /*******************************************************************
  94 start association reply
  95 ********************************************************************/
  96 static void start_assoc_reply(GENERIC_PACKET *q, GENERIC_PACKET *r)
  97 {
  98         int i;
  99
 100         /* check if we have already registered this client */
 101         if (!check_partner(q->header.assoc_ctx)) {
 102                 DEBUG(0,("start_assoc_reply: unknown client\n"));
 103                 stop_packet(q, r, STOP_REASON_USER_REASON);
 104                 return;
 105         }
 106
 107         if (!update_server_partner(q->header.assoc_ctx, q->sa_rp.assoc_ctx)) {
 108                 DEBUG(0,("start_assoc_reply: can't update server ctx\n"));
 109                 stop_packet(q, r, STOP_REASON_USER_REASON);
 110                 return;
 111         }
 112
 113         /* if pull, request map table */
 114         if (check_pull_partner(q->header.assoc_ctx)) {
 115                 fill_header(r, OPCODE_NON_NBT, get_server_assoc(q->header.assoc_ctx), MESSAGE_TYPE_REPLICATE);
 116
 117                 r->rep.msg_type=MESSAGE_REP_ADD_VERSION_REQUEST;
 118                 DEBUG(0,("start_assoc_reply: requesting map table\n"));
 119
 120                 return;
 121         }
 122
 123         /* if push, send our table */
 124         if (check_push_partner(q->header.assoc_ctx)) {
 125                 fill_header(r, OPCODE_NON_NBT, get_server_assoc(q->header.assoc_ctx), MESSAGE_TYPE_REPLICATE);
 126                 r->rep.msg_type=MESSAGE_REP_UPDATE_NOTIFY_REQUEST;
 127                 r->rep.un_rq.partner_count=partner_count;
 128
 129                 r->rep.un_rq.wins_owner=(WINS_OWNER *)talloc(mem_ctx, partner_count*sizeof(WINS_OWNER));
 130                 if (r->rep.un_rq.wins_owner==NULL) {
 131                         DEBUG(0,("start_assoc_reply: can't alloc memory\n"));
 132                         stop_packet(q, r, STOP_REASON_USER_REASON);
 133                         return;
 134                 }
 135
 136                 for (i=0; i<partner_count; i++)
 137                         r->rep.un_rq.wins_owner[i]=global_wins_table[0][i];
 138
 139                 DEBUG(0,("start_assoc_reply: sending update table\n"));
 140                 return;
 141         }
 142
 143         /* neither push/pull, stop */
 144         /* we should not come here */
 145         DEBUG(0,("we have a partner which is neither push nor pull !\n"));
 146         stop_packet(q, r, STOP_REASON_USER_REASON);
 147 }
 148
 149 /****************************************************************************
 150 initialise and fill the in-memory partner table.
 151 ****************************************************************************/
 152 int init_wins_partner_table(void)
 153 {
 154         int i=1,j=0,k;
 155         char **partner = lp_list_make(lp_wins_partners());
 156
 157         DEBUG(0, ("init_wins_partner_table: partners: %s\n", lp_wins_partners()));
 158
 159         global_wins_table[0][0].address=*iface_n_ip(0);
 160         global_wins_table[0][0].max_version=0;
 161         global_wins_table[0][0].min_version=0;
 162         global_wins_table[0][0].type=0;
 163
 164         while (partner[j]!=NULL) {
 165                 DEBUG(0,("init_wins_partner_table, adding partner: %s\n", partner[j]));
 166
 167                 global_wins_table[0][i].address=*interpret_addr2(partner[j]);
 168                 global_wins_table[0][i].max_version=0;
 169                 global_wins_table[0][i].min_version=0;
 170                 global_wins_table[0][i].type=0;
 171                 global_wins_table[0][i].last_pull=0;
 172                 global_wins_table[0][i].last_push=0;
 173
 174                 i++;
 175                 j++;
 176         }
 177
 178         for (k=1; k<i;k++)
 179                 for (j=0; j<i; j++)
 180                         global_wins_table[k][j]=global_wins_table[0][j];
 181
 182         lp_list_free (&partner);
 183
 184         return i;
 185 }
 186
 187 /****************************************************************************
 188 read the last ID from the wins tdb file.
 189 ****************************************************************************/
 190 static void get_our_last_id(WINS_OWNER *wins_owner)
 191 {
 192         TDB_CONTEXT *tdb;
 193
 194         tdb = tdb_open_log(lock_path(WINS_LIST), 0, TDB_DEFAULT, O_RDONLY, 0600);
 195         if (!tdb) {
 196                 DEBUG(2,("get_our_last_id: Can't open wins database file %s. Error was %s\n", WINS_LIST, strerror(errno) ));
 197                 return;
 198         }
 199
 200         wins_owner->max_version=((SMB_BIG_UINT)tdb_fetch_int(tdb, INFO_ID_HIGH))<<32 |
 201                                  (SMB_BIG_UINT)tdb_fetch_int(tdb, INFO_ID_LOW);
 202
 203         tdb_close(tdb);
 204 }
 205
 206 /****************************************************************************
 207 send the list of wins server we know.
 208 ****************************************************************************/
 209 static void send_version_number_map_table(GENERIC_PACKET *q, GENERIC_PACKET *r)
 210 {
 211         int i;
 212         int s_ctx=get_server_assoc(q->header.assoc_ctx);
 213
 214         if (s_ctx==0) {
 215                 DEBUG(0, ("send_entry_reply: request for a partner not in our table\n"));
 216                 stop_packet(q, r, STOP_REASON_USER_REASON);
 217                 return;
 218         }
 219
 220         /*
 221          * return an array of wins servers, we are partner with.
 222          * each entry contains the IP address and the version info
 223          * version: ID of the last entry we've got
 224          */
 225
 226         /* the first wins server must be self */
 227
 228         /*
 229          * get our last ID from the wins database
 230          * it can have been updated since last read
 231          * as nmbd got registration/release.
 232          */
 233         get_our_last_id(&global_wins_table[0][0]);
 234
 235         r->rep.avmt_rep.wins_owner=(WINS_OWNER *)talloc(mem_ctx, partner_count*sizeof(WINS_OWNER));
 236         if (r->rep.avmt_rep.wins_owner==NULL) {
 237                 stop_packet(q, r, STOP_REASON_USER_REASON);
 238                 return;
 239         }
 240
 241         DEBUG(0,("send_version_number_map_table: partner_count: %d\n", partner_count));
 242
 243         for (i=0; i<partner_count; i++) {
 244                 DEBUG(0,("send_version_number_map_table, partner: %d -> %s, \n", i, inet_ntoa(global_wins_table[0][i].address)));
 245                 r->rep.avmt_rep.wins_owner[i]=global_wins_table[0][i];
 246         }
 247
 248         r->rep.msg_type=1;
 249         r->rep.avmt_rep.partner_count=partner_count;
 250         r->rep.avmt_rep.initiating_wins_server.s_addr=0; /* blatant lie, NT4/w2K do the same ! */
 251         fill_header(r, OPCODE_NON_NBT, s_ctx, MESSAGE_TYPE_REPLICATE);
 252 }
 253
 254 /****************************************************************************
 255 for a given partner, ask it to send entries we don't have.
 256 ****************************************************************************/
 257 static BOOL check_partners_and_send_entries(GENERIC_PACKET *q, GENERIC_PACKET *r, int partner)
 258 {
 259         int server;
 260         int other;
 261         SMB_BIG_UINT temp;
 262         SMB_BIG_UINT current;
 263
 264
 265         /*
 266          * we check if our partner has more records than us.
 267          * we need to check more than our direct partners as
 268          * we can have this case:
 269          * us: A, partners: B,C, indirect partner: D
 270          * A<->B, A<->C, B<->D, C<->D
 271          *
 272          * So if we're talking to B, we need to check if between
 273          * B and C, which one have more records about D.
 274          * and also check if we don't already have the records.
 275          */
 276
 277
 278          /* check all servers even indirect */
 279          for (server=1; global_wins_table[0][server].address.s_addr!=0; server++) {
 280                 current = global_wins_table[partner][server].max_version;
 281
 282                 temp=0;
 283
 284                 for (other=1; other<partner_count; other++) {
 285                         /* skip the partner itself */
 286                         if (other==partner)
 287                                 continue;
 288
 289                         if (global_wins_table[other][server].max_version > temp)
 290                                 temp=global_wins_table[other][server].max_version;
 291                 }
 292
 293                 if (current >= temp && current > global_wins_table[0][server].max_version) {
 294                         /*
 295                          * it has more records than every body else and more than us,
 296                          * ask it the difference between what we have and what it has
 297                          */
 298                         fill_header(r, OPCODE_NON_NBT, get_server_assoc(q->header.assoc_ctx), MESSAGE_TYPE_REPLICATE);
 299
 300                         r->rep.msg_type=MESSAGE_REP_SEND_ENTRIES_REQUEST;
 301                         r->rep.se_rq.wins_owner.address=global_wins_table[partner][server].address;
 302
 303                         r->rep.se_rq.wins_owner.max_version=global_wins_table[partner][server].max_version;
 304                         r->rep.se_rq.wins_owner.min_version=global_wins_table[0][server].max_version;
 305                         r->rep.se_rq.wins_owner.type=0;
 306
 307                         write_server_assoc_table(q->header.assoc_ctx, global_wins_table[0][partner].address, global_wins_table[partner][server].address);
 308
 309                         /*
 310                          * and we update our version for this server
 311                          * as we can't use the IDs returned in the send_entries function
 312                          * the max ID can be larger than the largest ID returned
 313                          */
 314
 315                         global_wins_table[0][server].max_version=global_wins_table[partner][server].max_version;
 316
 317                         return True;
 318                 }
 319         }
 320         return False;
 321 }
 322
 323 /****************************************************************************
 324 receive the list of wins server we know.
 325 ****************************************************************************/
 326 static void receive_version_number_map_table(GENERIC_PACKET *q, GENERIC_PACKET *r)
 327 {
 328         fstring peer;
 329         struct in_addr addr;
 330         int i,j,k,l;
 331         int s_ctx=get_server_assoc(q->header.assoc_ctx);
 332
 333         if (s_ctx==0) {
 334                 DEBUG(0, ("receive_version_number_map_table: request for a partner not in our table\n"));
 335                 stop_packet(q, r, STOP_REASON_USER_REASON);
 336                 return;
 337         }
 338
 339         fstrcpy(peer,get_socket_addr(q->fd));
 340         addr=*interpret_addr2(peer);
 341
 342         get_our_last_id(&global_wins_table[0][0]);
 343
 344         DEBUG(0,("receive_version_number_map_table: received a map of %d server from: %s\n",
 345                   q->rep.avmt_rep.partner_count ,inet_ntoa(q->rep.avmt_rep.initiating_wins_server)));
 346         DEBUG(0,("real peer is: %s\n", peer));
 347
 348         for (i=0; global_wins_table[0][i].address.s_addr!=addr.s_addr && i<partner_count;i++)
 349                 ;
 350
 351         if (i==partner_count) {
 352                 DEBUG(0,("receive_version_number_map_table: unknown partner: %s\n", peer));
 353                 stop_packet(q, r, STOP_REASON_USER_REASON);
 354                 return;
 355         }
 356
 357         for (j=0; j<q->rep.avmt_rep.partner_count;j++) {
 358                 /*
 359                  * search if we already have this entry or if it's a new one
 360                  * it can be a new one in case of propagation
 361                  */
 362                 for (k=0; global_wins_table[0][k].address.s_addr!=0 &&
 363                           global_wins_table[0][k].address.s_addr!=q->rep.avmt_rep.wins_owner[j].address.s_addr; k++);
 364
 365                 global_wins_table[i][k].address.s_addr=q->rep.avmt_rep.wins_owner[j].address.s_addr;
 366                 global_wins_table[i][k].max_version=q->rep.avmt_rep.wins_owner[j].max_version;
 367                 global_wins_table[i][k].min_version=q->rep.avmt_rep.wins_owner[j].min_version;
 368                 global_wins_table[i][k].type=q->rep.avmt_rep.wins_owner[j].type;
 369
 370                 /*
 371                  * in case it's a new one, rewrite the address for all the partner
 372                  * to reserve the slot.
 373                  */
 374
 375                 for(l=0; l<partner_count; l++)
 376                         global_wins_table[l][k].address.s_addr=q->rep.avmt_rep.wins_owner[j].address.s_addr;
 377         }
 378
 379         dump_global_table();
 380
 381         /*
 382          * if this server have newer records than what we have
 383          * for several wins servers, we need to ask it.
 384          * Alas a send entry request is only on one server.
 385          * So in the send entry reply, we'll ask for the next server is required.
 386          */
 387
 388         if (check_partners_and_send_entries(q, r, i))
 389                 return;
 390
 391         /* it doesn't have more entries than us */
 392         stop_packet(q, r, STOP_REASON_USER_REASON);
 393 }
 394
 395 /****************************************************************************
 396 add an entry to the wins list we'll send.
 397 ****************************************************************************/
 398 static BOOL add_record_to_winsname(WINS_NAME **wins_name, int *max_names, char *name, int type, int wins_flags, int id, struct in_addr *ip_list, int num_ips)
 399 {
 400         WINS_NAME *temp_list;
 401         int i;
 402         int current=*max_names;
 403
 404         temp_list=talloc_realloc(mem_ctx, *wins_name, (current+1)*sizeof(WINS_NAME));
 405         if (temp_list==NULL)
 406                 return False;
 407
 408         temp_list[current].name_len=0x11;
 409
 410         safe_strcpy(temp_list[current].name, name, 15);
 411
 412         temp_list[current].type=type;
 413         temp_list[current].empty=0;
 414
 415         temp_list[current].name_flag=wins_flags;
 416
 417         if ( (wins_flags&0x03) == 1 || (wins_flags&0x03)==2)
 418                 temp_list[current].group_flag=0x01000000;
 419         else
 420                 temp_list[current].group_flag=0x00000000;
 421
 422         temp_list[current].id=id;
 423
 424         temp_list[current].owner.s_addr=ip_list[0].s_addr;
 425
 426         if (temp_list[current].name_flag & 2) {
 427                 temp_list[current].num_ip=num_ips;
 428                 temp_list[current].others=(struct in_addr *)talloc(mem_ctx, sizeof(struct in_addr)*num_ips);
 429                 if (temp_list[current].others==NULL)
 430                         return False;
 431
 432                 for (i=0; i<num_ips; i++)
 433                         temp_list[current].others[i].s_addr=ip_list[i].s_addr;
 434
 435         } else
 436                 temp_list[current].num_ip=1;
 437
 438         temp_list[current].foo=0xffffffff;
 439
 440         *wins_name=temp_list;
 441
 442         return True;
 443 }
 444
 445 /****************************************************************************
 446 send the list of name we have.
 447 ****************************************************************************/
 448 static void send_entry_request(GENERIC_PACKET *q, GENERIC_PACKET *r)
 449 {
 450         int max_names=0;
 451         int i;
 452         time_t time_now = time(NULL);
 453         WINS_OWNER *wins_owner;
 454         TDB_CONTEXT *tdb;
 455         TDB_DATA kbuf, dbuf, newkey;
 456         int s_ctx=get_server_assoc(q->header.assoc_ctx);
 457         int num_interfaces = iface_count();
 458
 459         if (s_ctx==0) {
 460                 DEBUG(0, ("send_entry_request: request for a partner not in our table\n"));
 461                 stop_packet(q, r, STOP_REASON_USER_REASON);
 462                 return;
 463         }
 464
 465
 466         wins_owner=&q->rep.se_rq.wins_owner;
 467         r->rep.se_rp.wins_name=NULL;
 468
 469         DEBUG(0,("send_entry_request: we have been asked to send the list of wins records\n"));
 470         DEBUGADD(0,("owned by: %s and between min: %d and max: %d\n", inet_ntoa(wins_owner->address),
 471                     (int)wins_owner->min_version, (int)wins_owner->max_version));
 472
 473         /*
 474          * if we are asked to send records owned by us
 475          * we overwrite the wins ip with 0.0.0.0
 476          * to make it easy in case of multihomed
 477          */
 478
 479         for (i=0; i<num_interfaces; i++)
 480                 if (ip_equal(wins_owner->address, *iface_n_ip(i))) {
 481                         wins_owner->address=*interpret_addr2("0.0.0.0");
 482                         break;
 483                 }
 484
 485
 486         tdb = tdb_open_log(lock_path(WINS_LIST), 0, TDB_DEFAULT, O_RDONLY, 0600);
 487         if (!tdb) {
 488                 DEBUG(2,("send_entry_request: Can't open wins database file %s. Error was %s\n", WINS_LIST, strerror(errno) ));
 489                 return;
 490         }
 491
 492         for (kbuf = tdb_firstkey(tdb);
 493              kbuf.dptr;
 494              newkey = tdb_nextkey(tdb, kbuf), safe_free(kbuf.dptr), kbuf=newkey) {
 495                 pstring name_type, name, ip_str;
 496                 char *p;
 497                 int type = 0;
 498                 int nb_flags;
 499                 int ttl;
 500                 unsigned int num_ips;
 501                 int low, high;
 502                 SMB_BIG_UINT version;
 503                 struct in_addr wins_ip;
 504                 struct in_addr *ip_list;
 505                 int wins_flags;
 506                 int len;
 507
 508                 if (strncmp(kbuf.dptr, ENTRY_PREFIX, strlen(ENTRY_PREFIX)) != 0)
 509                         continue;
 510
 511
 512                 dbuf = tdb_fetch(tdb, kbuf);
 513                 if (!dbuf.dptr)
 514                         continue;
 515
 516                 fstrcpy(name_type, kbuf.dptr+strlen(ENTRY_PREFIX));
 517                 pstrcpy(name, name_type);
 518
 519                 if((p = strchr(name,'#')) != NULL) {
 520                         *p = 0;
 521                         sscanf(p+1,"%x",&type);
 522                 }
 523
 524                 len = tdb_unpack(dbuf.dptr, dbuf.dsize, "dddfddd",
 525                                 &nb_flags,
 526                                 &high,
 527                                 &low,
 528                                 ip_str,
 529                                 &ttl,
 530                                 &num_ips,
 531                                 &wins_flags);
 532
 533                 wins_ip=*interpret_addr2(ip_str);
 534
 535                 /* Allocate the space for the ip_list. */
 536                 if((ip_list = (struct in_addr *)talloc(mem_ctx,  num_ips * sizeof(struct in_addr))) == NULL) {
 537                         DEBUG(0,("initialise_wins: talloc fail !\n"));
 538                         return;
 539                 }
 540
 541                 for (i = 0; i < num_ips; i++) {
 542                         len += tdb_unpack(dbuf.dptr+len, dbuf.dsize-len, "f", ip_str);
 543                         ip_list[i] = *interpret_addr2(ip_str);
 544                 }
 545
 546                 /* add all entries that have 60 seconds or more to live */
 547                 if ((ttl - 60) > time_now || ttl == PERMANENT_TTL) {
 548                         if(ttl != PERMANENT_TTL)
 549                                 ttl -= time_now;
 550
 551                         DEBUG( 4, ("send_entry_request: add name: %s#%02x ttl = %d first IP %s flags = %2x\n",
 552                             name, type, ttl, inet_ntoa(ip_list[0]), nb_flags));
 553
 554                         /* add the record to the list to send */
 555                         version=((SMB_BIG_UINT)high)<<32 | low;
 556
 557                         if (wins_owner->min_version<=version && wins_owner->max_version>=version &&
 558                             wins_owner->address.s_addr==wins_ip.s_addr) {
 559                                 if(!add_record_to_winsname(&r->rep.se_rp.wins_name, &max_names, name, type, wins_flags, version, ip_list, num_ips))
 560                                         return;
 561                                 max_names++;
 562                         }
 563
 564                 } else {
 565                         DEBUG(4, ("send_entry_request: not adding name (ttl problem) %s#%02x ttl = %d first IP %s flags = %2x\n",
 566                                   name, type, ttl, inet_ntoa(ip_list[0]), nb_flags));
 567                 }
 568         }
 569
 570         tdb_close(tdb);
 571
 572         DEBUG(0,("send_entry_request, sending %d records\n", max_names));
 573         fill_header(r, OPCODE_NON_NBT, s_ctx, MESSAGE_TYPE_REPLICATE);
 574         r->rep.msg_type=MESSAGE_REP_SEND_ENTRIES_REPLY; /* reply */
 575         r->rep.se_rp.max_names=max_names;
 576 }
 577
 578
 579 /****************************************************************************
 580 .
 581 ****************************************************************************/
 582 static void update_notify_request(GENERIC_PACKET *q, GENERIC_PACKET *r)
 583 {
 584         int i,j,k,l;
 585         UPDATE_NOTIFY_REQUEST *u;
 586         int s_ctx=get_server_assoc(q->header.assoc_ctx);
 587
 588         if (s_ctx==0) {
 589                 DEBUG(0, ("send_entry_reply: request for a partner not in our table\n"));
 590                 stop_packet(q, r, STOP_REASON_USER_REASON);
 591                 return;
 592         }
 593
 594         u=&q->rep.un_rq;
 595
 596         /* check if we already have the range of records */
 597
 598         DEBUG(0,("update_notify_request: wins server: %s offered this list of %d records:\n",
 599                 inet_ntoa(u->initiating_wins_server), u->partner_count));
 600
 601         get_our_last_id(&global_wins_table[0][0]);
 602
 603         for (i=0; i<partner_count; i++) {
 604                 if (global_wins_table[0][i].address.s_addr==u->initiating_wins_server.s_addr) {
 605                         DEBUG(0,("update_notify_request: found initiator at index %d\n", i));
 606                         break;
 607                 }
 608         }
 609
 610         /*
 611          * some explanation is required, before someone say it's crap.
 612          *
 613          * let's take an example, we have 2 wins partners, we already now
 614          * that our max id is 10, partner 1 ID is 20 and partner 2 ID is 30
 615          * the array looks like:
 616          *
 617          *      0       1       2
 618          * 0    10      20      30
 619          * 1
 620          * 2
 621          *
 622          * we receive an update from partner 2 saying he has: 1:15, 2:40, 3:50
 623          * we must enlarge the array to add partner 3, it will look like:
 624          *
 625          *      0       1       2       3
 626          * 0    10      20      30
 627          * 1
 628          * 2            15      40      50
 629          *
 630          * now we know, we should pull from partner 2, the records 30->40 of 2 and 0->50 of 3.
 631          * once the pull will be over, our table will look like:
 632          *
 633          *      0       1       2       3
 634          * 0    10      20      40      50
 635          * 1
 636          * 2            15      40      50
 637          *
 638          *
 639          */
 640
 641         for (j=0; j<u->partner_count;j++) {
 642                 /*
 643                  * search if we already have this entry or if it's a new one
 644                  * it can be a new one in case of propagation
 645                  */
 646
 647                 for (k=0; global_wins_table[0][k].address.s_addr!=0 &&
 648                           global_wins_table[0][k].address.s_addr!=u->wins_owner[j].address.s_addr; k++);
 649
 650                 global_wins_table[i][k].address.s_addr=u->wins_owner[j].address.s_addr;
 651                 global_wins_table[i][k].max_version=u->wins_owner[j].max_version;
 652                 global_wins_table[i][k].min_version=u->wins_owner[j].min_version;
 653                 global_wins_table[i][k].type=u->wins_owner[j].type;
 654
 655                 /*
 656                  * in case it's a new one, rewrite the address for all the partner
 657                  * to reserve the slot.
 658                  */
 659
 660                 for(l=0; l<partner_count; l++)
 661                         global_wins_table[l][k].address.s_addr=u->wins_owner[j].address.s_addr;
 662         }
 663
 664         dump_global_table();
 665
 666         stop_packet(q, r, STOP_REASON_USER_REASON);
 667 }
 668
 669 /****************************************************************************
 670 .
 671 ****************************************************************************/
 672 static void send_entry_reply(GENERIC_PACKET *q, GENERIC_PACKET *r)
 673 {
 674         int i,j,k;
 675         struct in_addr partner, server;
 676         pid_t pid;
 677         int s_ctx=get_server_assoc(q->header.assoc_ctx);
 678         WINS_RECORD record;
 679
 680         if (s_ctx==0) {
 681                 DEBUG(0, ("send_entry_reply: request for a partner not in our table\n"));
 682                 stop_packet(q, r, STOP_REASON_USER_REASON);
 683                 return;
 684         }
 685
 686         DEBUG(0,("send_entry_reply:got %d new records\n", q->rep.se_rp.max_names));
 687
 688         /* we got records from a wins partner but that can be from another wins server */
 689         /* hopefully we track that */
 690
 691         /* and the only doc available from MS is wrong ! */
 692
 693         get_server_assoc_table(q->header.assoc_ctx, &partner, &server);
 694
 695         for (j=0; global_wins_table[0][j].address.s_addr!=0; j++) {
 696                 if (global_wins_table[0][j].address.s_addr==server.s_addr) {
 697                         DEBUG(0,("send_entry_reply: found server at index %d\n", j));
 698                         break;
 699                 }
 700         }
 701
 702         pid = pidfile_pid("nmbd");
 703         if (pid == 0) {
 704                 DEBUG(0,("send_entry_reply: Can't find pid for nmbd\n"));
 705                 return;
 706         }
 707
 708         for (k=0; k<q->rep.se_rp.max_names; k++) {
 709                 DEBUG(0,("send_entry_reply: %s<%02x> %d\n", q->rep.se_rp.wins_name[k].name, q->rep.se_rp.wins_name[k].type,
 710                          (int)q->rep.se_rp.wins_name[k].id));
 711
 712                 safe_strcpy(record.name, q->rep.se_rp.wins_name[k].name, 16);
 713                 record.type=q->rep.se_rp.wins_name[k].type;
 714                 record.id=q->rep.se_rp.wins_name[k].id;
 715                 record.wins_flags=q->rep.se_rp.wins_name[k].name_flag&0x00ff;
 716                 record.num_ips=q->rep.se_rp.wins_name[k].num_ip;
 717
 718                 record.wins_ip.s_addr=server.s_addr;
 719
 720                 if (record.num_ips==1)
 721                         record.ip[0]=q->rep.se_rp.wins_name[k].owner;
 722                 else
 723                         for (i=0; i<record.num_ips; i++)
 724                                 record.ip[i]=q->rep.se_rp.wins_name[k].others[i];
 725
 726                 record.nb_flags=0;
 727
 728                 if (record.wins_flags&WINS_NGROUP || record.wins_flags&WINS_SGROUP)
 729                         record.nb_flags|=NB_GROUP;
 730
 731                 if (record.wins_flags&WINS_ACTIVE)
 732                         record.nb_flags|=NB_ACTIVE;
 733
 734                 record.nb_flags|=record.wins_flags&WINS_HNODE;
 735
 736                 message_send_pid(pid, MSG_WINS_NEW_ENTRY, &record, sizeof(record), False);
 737
 738         }
 739
 740         dump_global_table();
 741
 742         /*
 743          * we got some entries,
 744          * ask the partner to send us the map table again
 745          * to get the other servers entries.
 746          *
 747          * we're getting the map table 1 time more than really
 748          * required. We could remove that call, but that
 749          * would complexify the code. I prefer this trade-of.
 750          */
 751         fill_header(r, OPCODE_NON_NBT, s_ctx, MESSAGE_TYPE_REPLICATE);
 752
 753         r->rep.msg_type=MESSAGE_REP_ADD_VERSION_REQUEST;
 754 }
 755
 756 /****************************************************************************
 757 decode the replication message and reply.
 758 ****************************************************************************/
 759 static void replicate(GENERIC_PACKET *q, GENERIC_PACKET *r)
 760 {
 761         switch (q->rep.msg_type) {
 762                 case 0:
 763                         /* add version number map table request */
 764                         send_version_number_map_table(q, r);
 765                         break;
 766                 case 1:
 767                         receive_version_number_map_table(q, r);
 768                         break;
 769                 case 2:
 770                         /* send entry request */
 771                         send_entry_request(q, r);
 772                         break;
 773                 case 3:
 774                         /* send entry reply */
 775                         send_entry_reply(q, r);
 776                         break;
 777                 case 4:
 778                         /* update notification request */
 779                         update_notify_request(q, r);
 780                         break;
 781         }
 782 }
 783
 784 /****************************************************************************
 785 do a switch on the message type, and return the response size
 786 ****************************************************************************/
 787 static BOOL switch_message(GENERIC_PACKET *q, GENERIC_PACKET *r)
 788 {
 789         switch (q->header.mess_type) {
 790                 case 0:
 791                         /* Start association type */
 792                         start_assoc_process(q, r);
 793                         return True;
 794                         break;
 795                 case 1:
 796                         /* start association reply */
 797                         start_assoc_reply(q, r);
 798                         return True;
 799                         break;
 800                 case 2:
 801                         /* stop association message */
 802                         /*
 803                          * remove the partner from the list and
 804                          * reply false to NOT send a packet
 805                          */
 806                         remove_partner(q->header.assoc_ctx);
 807                         return False;
 808                         break;
 809                 case 3:
 810                         /* replication message */
 811                         replicate(q, r);
 812                         return True;
 813                         break;
 814         }
 815
 816         return False;
 817 }
 818
 819
 820 /****************************************************************************
 821   construct a reply to the incoming packet
 822 ****************************************************************************/
 823 void construct_reply(struct wins_packet_struct *p)
 824 {
 825         GENERIC_PACKET r;
 826         struct BUFFER buffer;
 827
 828         buffer.buffer=NULL;
 829         buffer.offset=0;
 830         buffer.length=0;
 831
 832         DEBUG(0,("dump: received packet\n"));
 833         dump_generic_packet(p->packet);
 834
 835         /* Verify if the request we got is from a listed partner */
 836         if (!check_partner(p->packet->header.assoc_ctx)) {
 837                 fstring peer;
 838                 struct in_addr addr;
 839                 int i;
 840                 fstrcpy(peer,get_socket_addr(p->fd));
 841                 addr=*interpret_addr2(peer);
 842
 843                 for (i=1; i<partner_count; i++)
 844                         if (ip_equal(addr, global_wins_table[0][i].address))
 845                                 break;
 846
 847                 if (i==partner_count) {
 848                         DEBUG(0,("construct_reply: got a request from a non peer machine: %s\n", peer));
 849                         stop_packet(p->packet, &r, STOP_REASON_AUTH_FAILED);
 850                         p->stop_packet=True;
 851                         encode_generic_packet(&buffer, &r);
 852                         if (!send_smb(p->fd, buffer.buffer))
 853                                 exit_server("process_smb: send_smb failed.");
 854                         return;
 855                 }
 856         }
 857
 858         if (switch_message(p->packet, &r)) {
 859                 encode_generic_packet(&buffer, &r);
 860                 DEBUG(0,("dump: sending packet\n"));
 861                 dump_generic_packet(&r);
 862
 863                 if(buffer.offset > 0) {
 864                         if (!send_smb(p->fd, buffer.buffer))
 865                                 exit_server("process_smb: send_smb failed.");
 866                 }
 867         }
 868
 869         /* if we got a stop assoc or if we send a stop assoc, close the fd after */
 870         if (p->packet->header.mess_type==MESSAGE_TYPE_STOP_ASSOC ||
 871             r.header.mess_type==MESSAGE_TYPE_STOP_ASSOC)
 872                 p->stop_packet=True;
 873 }
 874
 875 /****************************************************************************
 876   contact periodically our wins partner to do a pull replication
 877 ****************************************************************************/
 878 void run_pull_replication(time_t t)
 879 {
 880         /* we pull every 30 minutes to query about new records*/
 881         int i, s;
 882         struct BUFFER buffer;
 883         GENERIC_PACKET p;
 884
 885         buffer.buffer=NULL;
 886         buffer.offset=0;
 887         buffer.length=0;
 888
 889         for (i=1; i<partner_count; i++) {
 890                 if (global_wins_table[0][i].last_pull < t) {
 891                         global_wins_table[0][i].last_pull=t+30*60; /* next in 30 minutes */
 892
 893                         /* contact the wins server */
 894                         p.header.mess_type=MESSAGE_TYPE_START_ASSOC_REQUEST;
 895                         p.header.opcode=OPCODE_NON_NBT;
 896                         p.header.assoc_ctx=0;
 897                         p.sa_rq.assoc_ctx=(int)t;
 898                         p.sa_rq.min_ver=1;
 899                         p.sa_rq.maj_ver=1;
 900
 901                         DEBUG(3,("run_pull_replication: contacting wins server %s.\n", inet_ntoa(global_wins_table[0][i].address)));
 902                         encode_generic_packet(&buffer, &p);
 903                         dump_generic_packet(&p);
 904
 905                         /* send the packet to the server and add the descriptor to receive answers */
 906                         s=open_socket_out(SOCK_STREAM, &global_wins_table[0][i].address, 42, LONG_CONNECT_TIMEOUT);
 907                         if (s==-1) {
 908                                 DEBUG(0,("run_pull_replication: can't contact wins server %s.\n", inet_ntoa(global_wins_table[0][i].address)));
 909                                 return;
 910                         }
 911
 912                         if(buffer.offset > 0) {
 913                                 if (!send_smb(s, buffer.buffer))
 914                                         exit_server("run_pull_replication: send_smb failed.");
 915                         }
 916
 917                         add_fd_to_sock_array(s);
 918                         FD_SET(s, listen_set);
 919
 920                         /* add ourself as a client */
 921                         add_partner((int)t, 0, True, False);
 922                 }
 923         }
 924 }
 925
 926 /****************************************************************************
 927   contact periodically our wins partner to do a push replication
 928 ****************************************************************************/
 929 void run_push_replication(time_t t)
 930 {
 931         /* we push every 30 minutes or 25 new entries */
 932
 933 }
 934