source3/nmbd/nmbd_incomingdgrams.c

   1 /*
   2    Unix SMB/CIFS implementation.
   3    NBT netbios routines and daemon - version 2
   4    Copyright (C) Andrew Tridgell 1994-1998
   5    Copyright (C) Luke Kenneth Casson Leighton 1994-1998
   6    Copyright (C) Jeremy Allison 1994-1998
   7
   8    This program is free software; you can redistribute it and/or modify
   9    it under the terms of the GNU General Public License as published by
  10    the Free Software Foundation; either version 2 of the License, or
  11    (at your option) any later version.
  12
  13    This program is distributed in the hope that it will be useful,
  14    but WITHOUT ANY WARRANTY; without even the implied warranty of
  15    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  16    GNU General Public License for more details.
  17
  18    You should have received a copy of the GNU General Public License
  19    along with this program; if not, write to the Free Software
  20    Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
  21
  22 */
  23
  24 #include "includes.h"
  25
  26 extern BOOL found_lm_clients;
  27
  28 #if 0
  29
  30 /* XXXX note: This function is currently unsuitable for use, as it
  31    does not properly check that a server is in a fit state to become
  32    a backup browser before asking it to be one.
  33    The code is left here to be worked on at a later date.
  34 */
  35
  36 /****************************************************************************
  37 Tell a server to become a backup browser
  38 **************************************************************************/
  39
  40 void tell_become_backup(void)
  41 {
  42   struct subnet_record *subrec;
  43   for (subrec = FIRST_SUBNET; subrec; subrec = NEXT_SUBNET_EXCLUDING_UNICAST(subrec))
  44   {
  45     struct work_record *work;
  46     for (work = subrec->workgrouplist; work; work = work->next)
  47     {
  48       struct server_record *servrec;
  49       int num_servers = 0;
  50       int num_backups = 0;
  51
  52       for (servrec = work->serverlist; servrec; servrec = servrec->next)
  53       {
  54         num_servers++;
  55
  56         if (is_myname(servrec->serv.name))
  57           continue;
  58
  59         if (servrec->serv.type & SV_TYPE_BACKUP_BROWSER)
  60         {
  61           num_backups++;
  62           continue;
  63         }
  64
  65         if (servrec->serv.type & SV_TYPE_MASTER_BROWSER)
  66           continue;
  67
  68         if (!(servrec->serv.type & SV_TYPE_POTENTIAL_BROWSER))
  69           continue;
  70
  71         DEBUG(3,("num servers: %d num backups: %d\n",
  72               num_servers, num_backups));
  73
  74         /* make first server a backup server. thereafter make every
  75            tenth server a backup server */
  76         if (num_backups != 0 && (num_servers+9) / num_backups > 10)
  77           continue;
  78
  79         DEBUG(2,("sending become backup to %s %s for %s\n",
  80              servrec->serv.name, inet_ntoa(subrec->bcast_ip),
  81              work->work_group));
  82
  83         /* type 11 request from MYNAME(20) to WG(1e) for SERVER */
  84         do_announce_request(servrec->serv.name, work->work_group,
  85               ANN_BecomeBackup, 0x20, 0x1e, subrec->bcast_ip);
  86       }
  87     }
  88   }
  89 }
  90 #endif
  91
  92 /*******************************************************************
  93   Process an incoming host announcement packet.
  94 *******************************************************************/
  95
  96 void process_host_announce(struct subnet_record *subrec, struct packet_struct *p, char *buf)
  97 {
  98         struct dgram_packet *dgram = &p->packet.dgram;
  99         int ttl = IVAL(buf,1)/1000;
 100         unstring announce_name;
 101         uint32 servertype = IVAL(buf,23);
 102         fstring comment;
 103         struct work_record *work;
 104         struct server_record *servrec;
 105         unstring work_name;
 106         unstring source_name;
 107
 108         START_PROFILE(host_announce);
 109
 110         pull_ascii_fstring(comment, buf+31);
 111
 112         pull_ascii_nstring(announce_name, sizeof(announce_name), buf+5);
 113         pull_ascii_nstring(source_name, sizeof(source_name), dgram->source_name.name);
 114
 115         DEBUG(3,("process_host_announce: from %s<%02x> IP %s to \
 116 %s for server %s.\n", source_name, source_name[15], inet_ntoa(p->ip),
 117                         nmb_namestr(&dgram->dest_name),announce_name));
 118
 119         DEBUG(5,("process_host_announce: ttl=%d server type=%08x comment=%s\n",
 120                 ttl, servertype,comment));
 121
 122         /* Filter servertype to remove impossible bits. */
 123         servertype &= ~(SV_TYPE_LOCAL_LIST_ONLY|SV_TYPE_DOMAIN_ENUM);
 124
 125         /* A host announcement must be sent to the name WORKGROUP<1d>. */
 126         if(dgram->dest_name.name_type != 0x1d) {
 127                 DEBUG(2,("process_host_announce: incorrect name type for destination from IP %s \
 128 (was %02x) should be 0x1d. Allowing packet anyway.\n",
 129                         inet_ntoa(p->ip), dgram->dest_name.name_type));
 130                 /* Change it so it was. */
 131                 dgram->dest_name.name_type = 0x1d;
 132         }
 133
 134         /* For a host announce the workgroup name is the destination name. */
 135         pull_ascii_nstring(work_name, sizeof(work_name), dgram->dest_name.name);
 136
 137         /*
 138          * Syntax servers version 5.1 send HostAnnounce packets to
 139          * *THE WRONG NAME*. They send to LOCAL_MASTER_BROWSER_NAME<00>
 140          * instead of WORKGROUP<1d> name. So to fix this we check if
 141          * the workgroup name is our own name, and if so change it
 142          * to be our primary workgroup name.
 143          */
 144
 145         if(strequal(work_name, global_myname()))
 146                 unstrcpy(work_name,lp_workgroup());
 147
 148         /*
 149          * We are being very agressive here in adding a workgroup
 150          * name on the basis of a host announcing itself as being
 151          * in that workgroup. Maybe we should wait for the workgroup
 152          * announce instead ? JRA.
 153          */
 154
 155         work = find_workgroup_on_subnet(subrec, work_name);
 156
 157         if(servertype != 0) {
 158                 if (work ==NULL ) {
 159                         /* We have no record of this workgroup. Add it. */
 160                         if((work = create_workgroup_on_subnet(subrec, work_name, ttl))==NULL)
 161                                 goto done;
 162                 }
 163
 164                 if((servrec = find_server_in_workgroup( work, announce_name))==NULL) {
 165                         /* If this server is not already in the workgroup, add it. */
 166                         create_server_on_workgroup(work, announce_name,
 167                                 servertype|SV_TYPE_LOCAL_LIST_ONLY,
 168                                 ttl, comment);
 169                 } else {
 170                         /* Update the record. */
 171                         servrec->serv.type = servertype|SV_TYPE_LOCAL_LIST_ONLY;
 172                         update_server_ttl( servrec, ttl);
 173                         fstrcpy(servrec->serv.comment,comment);
 174                 }
 175         } else {
 176                 /*
 177                  * This server is announcing it is going down. Remove it from the
 178                  * workgroup.
 179                  */
 180                 if(!is_myname(announce_name) && (work != NULL) &&
 181                                 ((servrec = find_server_in_workgroup( work, announce_name))!=NULL)) {
 182                         remove_server_from_workgroup( work, servrec);
 183                 }
 184         }
 185
 186         subrec->work_changed = True;
 187 done:
 188
 189         END_PROFILE(host_announce);
 190 }
 191
 192 /*******************************************************************
 193   Process an incoming WORKGROUP announcement packet.
 194 *******************************************************************/
 195
 196 void process_workgroup_announce(struct subnet_record *subrec, struct packet_struct *p, char *buf)
 197 {
 198         struct dgram_packet *dgram = &p->packet.dgram;
 199         int ttl = IVAL(buf,1)/1000;
 200         unstring workgroup_announce_name;
 201         unstring master_name;
 202         uint32 servertype = IVAL(buf,23);
 203         struct work_record *work;
 204         unstring source_name;
 205         unstring dest_name;
 206
 207         START_PROFILE(workgroup_announce);
 208
 209         pull_ascii_nstring(workgroup_announce_name,sizeof(workgroup_announce_name),buf+5);
 210         pull_ascii_nstring(master_name,sizeof(master_name),buf+31);
 211         pull_ascii_nstring(source_name,sizeof(source_name),dgram->source_name.name);
 212         pull_ascii_nstring(dest_name,sizeof(dest_name),dgram->dest_name.name);
 213
 214         DEBUG(3,("process_workgroup_announce: from %s<%02x> IP %s to \
 215 %s for workgroup %s.\n", source_name, source_name[15], inet_ntoa(p->ip),
 216                         nmb_namestr(&dgram->dest_name),workgroup_announce_name));
 217
 218         DEBUG(5,("process_workgroup_announce: ttl=%d server type=%08x master browser=%s\n",
 219                 ttl, servertype, master_name));
 220
 221         /* Workgroup announcements must only go to the MSBROWSE name. */
 222         if (!strequal(dest_name, MSBROWSE) || (dgram->dest_name.name_type != 0x1)) {
 223                 DEBUG(0,("process_workgroup_announce: from IP %s should be to __MSBROWSE__<0x01> not %s\n",
 224                         inet_ntoa(p->ip), nmb_namestr(&dgram->dest_name)));
 225                 goto done;
 226         }
 227
 228         if ((work = find_workgroup_on_subnet(subrec, workgroup_announce_name))==NULL) {
 229                 /* We have no record of this workgroup. Add it. */
 230                 if((work = create_workgroup_on_subnet(subrec, workgroup_announce_name, ttl))==NULL)
 231                         goto done;
 232         } else {
 233                 /* Update the workgroup death_time. */
 234                 update_workgroup_ttl(work, ttl);
 235         }
 236
 237         if(*work->local_master_browser_name == '\0') {
 238                 /* Set the master browser name. */
 239                 set_workgroup_local_master_browser_name( work, master_name );
 240         }
 241
 242         subrec->work_changed = True;
 243
 244 done:
 245
 246         END_PROFILE(workgroup_announce);
 247 }
 248
 249 /*******************************************************************
 250   Process an incoming local master browser announcement packet.
 251 *******************************************************************/
 252
 253 void process_local_master_announce(struct subnet_record *subrec, struct packet_struct *p, char *buf)
 254 {
 255         struct dgram_packet *dgram = &p->packet.dgram;
 256         int ttl = IVAL(buf,1)/1000;
 257         unstring server_name;
 258         uint32 servertype = IVAL(buf,23);
 259         fstring comment;
 260         unstring work_name;
 261         struct work_record *work;
 262         struct server_record *servrec;
 263         unstring source_name;
 264
 265         START_PROFILE(local_master_announce);
 266
 267         pull_ascii_nstring(server_name,sizeof(server_name),buf+5);
 268         pull_ascii_fstring(comment, buf+31);
 269         pull_ascii_nstring(source_name, sizeof(source_name), dgram->source_name.name);
 270         pull_ascii_nstring(work_name, sizeof(work_name), dgram->dest_name.name);
 271
 272         DEBUG(3,("process_local_master_announce: from %s<%02x> IP %s to \
 273 %s for server %s.\n", source_name, source_name[15], inet_ntoa(p->ip),
 274                 nmb_namestr(&dgram->dest_name),server_name));
 275
 276         DEBUG(5,("process_local_master_announce: ttl=%d server type=%08x comment=%s\n",
 277                 ttl, servertype, comment));
 278
 279         /* A local master announcement must be sent to the name WORKGROUP<1e>. */
 280         if(dgram->dest_name.name_type != 0x1e) {
 281                 DEBUG(0,("process_local_master_announce: incorrect name type for destination from IP %s \
 282 (was %02x) should be 0x1e. Ignoring packet.\n",
 283                         inet_ntoa(p->ip), dgram->dest_name.name_type));
 284                 goto done;
 285         }
 286
 287         /* Filter servertype to remove impossible bits. */
 288         servertype &= ~(SV_TYPE_LOCAL_LIST_ONLY|SV_TYPE_DOMAIN_ENUM);
 289
 290         /* For a local master announce the workgroup name is the destination name. */
 291
 292         if ((work = find_workgroup_on_subnet(subrec, work_name))==NULL) {
 293                 /* Don't bother adding if it's a local master release announce. */
 294                 if(servertype == 0)
 295                         goto done;
 296
 297                 /* We have no record of this workgroup. Add it. */
 298                 if((work = create_workgroup_on_subnet(subrec, work_name, ttl))==NULL)
 299                         goto done;
 300         }
 301
 302         /* If we think we're the local master browser for this workgroup,
 303                 we should never have got this packet. We don't see our own
 304                 packets.
 305         */
 306         if(AM_LOCAL_MASTER_BROWSER(work)) {
 307                 DEBUG(0,("process_local_master_announce: Server %s at IP %s is announcing itself as \
 308 a local master browser for workgroup %s and we think we are master. Forcing election.\n",
 309                         server_name, inet_ntoa(p->ip), work_name));
 310
 311                 /* Samba nmbd versions 1.9.17 to 1.9.17p4 have a bug in that when
 312                  they have become a local master browser once, they will never
 313                  stop sending local master announcements. To fix this we send
 314                  them a reset browser packet, with level 0x2 on the __SAMBA__
 315                  name that only they should be listening to. */
 316
 317                 send_browser_reset( 0x2, "__SAMBA__" , 0x20, p->ip);
 318
 319                 /* We should demote ourself and force an election. */
 320
 321                 unbecome_local_master_browser( subrec, work, True);
 322
 323                 /* The actual election requests are handled in nmbd_election.c */
 324                 goto done;
 325         }
 326
 327         /* Find the server record on this workgroup. If it doesn't exist, add it. */
 328
 329         if(servertype != 0) {
 330                 if((servrec = find_server_in_workgroup( work, server_name))==NULL) {
 331                         /* If this server is not already in the workgroup, add it. */
 332                         create_server_on_workgroup(work, server_name,
 333                                 servertype|SV_TYPE_LOCAL_LIST_ONLY,
 334                                 ttl, comment);
 335                 } else {
 336                         /* Update the record. */
 337                         servrec->serv.type = servertype|SV_TYPE_LOCAL_LIST_ONLY;
 338                         update_server_ttl(servrec, ttl);
 339                         fstrcpy(servrec->serv.comment,comment);
 340                 }
 341
 342                 set_workgroup_local_master_browser_name( work, server_name );
 343         } else {
 344                 /*
 345                  * This server is announcing it is going down. Remove it from the
 346                  * workgroup.
 347                  */
 348                 if(!is_myname(server_name) && (work != NULL) &&
 349                                 ((servrec = find_server_in_workgroup( work, server_name))!=NULL)) {
 350                         remove_server_from_workgroup( work, servrec);
 351                 }
 352         }
 353
 354         subrec->work_changed = True;
 355 done:
 356
 357         END_PROFILE(local_master_announce);
 358 }
 359
 360 /*******************************************************************
 361   Process a domain master announcement frame.
 362   Domain master browsers receive these from local masters. The Domain
 363   master should then issue a sync with the local master, asking for
 364   that machines local server list.
 365 ******************************************************************/
 366
 367 void process_master_browser_announce(struct subnet_record *subrec,
 368                                      struct packet_struct *p,char *buf)
 369 {
 370         unstring local_master_name;
 371         struct work_record *work;
 372         struct browse_cache_record *browrec;
 373
 374         START_PROFILE(master_browser_announce);
 375
 376         pull_ascii_nstring(local_master_name,sizeof(local_master_name),buf);
 377
 378         DEBUG(3,("process_master_browser_announce: Local master announce from %s IP %s.\n",
 379                 local_master_name, inet_ntoa(p->ip)));
 380
 381         if (!lp_domain_master()) {
 382                 DEBUG(0,("process_master_browser_announce: Not configured as domain \
 383 master - ignoring master announce.\n"));
 384                 goto done;
 385         }
 386
 387         if((work = find_workgroup_on_subnet(subrec, lp_workgroup())) == NULL) {
 388                 DEBUG(0,("process_master_browser_announce: Cannot find workgroup %s on subnet %s\n",
 389                         lp_workgroup(), subrec->subnet_name));
 390                 goto done;
 391         }
 392
 393         if(!AM_DOMAIN_MASTER_BROWSER(work)) {
 394                 DEBUG(0,("process_master_browser_announce: Local master announce made to us from \
 395 %s IP %s and we are not a domain master browser.\n", local_master_name, inet_ntoa(p->ip)));
 396                 goto done;
 397         }
 398
 399         /* Add this host as a local master browser entry on the browse lists.
 400                 This causes a sync request to be made to it at a later date.
 401         */
 402
 403         if((browrec = find_browser_in_lmb_cache( local_master_name )) == NULL) {
 404                 /* Add it. */
 405                 create_browser_in_lmb_cache( work->work_group, local_master_name, p->ip);
 406         } else {
 407                 update_browser_death_time(browrec);
 408         }
 409
 410 done:
 411
 412         END_PROFILE(master_browser_announce);
 413 }
 414
 415 /*******************************************************************
 416   Process an incoming LanMan host announcement packet.
 417 *******************************************************************/
 418
 419 void process_lm_host_announce(struct subnet_record *subrec, struct packet_struct *p, char *buf, int len)
 420 {
 421         struct dgram_packet *dgram = &p->packet.dgram;
 422         uint32 servertype = IVAL(buf,1);
 423         int osmajor=CVAL(buf,5);           /* major version of node software */
 424         int osminor=CVAL(buf,6);           /* minor version of node software */
 425         int ttl = SVAL(buf,7);
 426         unstring announce_name;
 427         struct work_record *work;
 428         struct server_record *servrec;
 429         unstring work_name;
 430         unstring source_name;
 431         fstring comment;
 432         char *s = get_safe_str_ptr(buf,len,buf,9);
 433
 434         START_PROFILE(lm_host_announce);
 435         if (!s) {
 436                 goto done;
 437         }
 438         s = skip_string(buf,len,s,1);
 439         if (!s) {
 440                 goto done;
 441         }
 442         pull_ascii(comment, s, sizeof(fstring), 43, STR_TERMINATE);
 443
 444         pull_ascii_nstring(announce_name,sizeof(announce_name),buf+9);
 445         pull_ascii_nstring(source_name,sizeof(source_name),dgram->source_name.name);
 446         /* For a LanMan host announce the workgroup name is the destination name. */
 447         pull_ascii_nstring(work_name,sizeof(work_name),dgram->dest_name.name);
 448
 449         DEBUG(3,("process_lm_host_announce: LM Announcement from %s IP %s to \
 450 %s for server %s.\n", nmb_namestr(&dgram->source_name), inet_ntoa(p->ip),
 451                 nmb_namestr(&dgram->dest_name),announce_name));
 452
 453         DEBUG(5,("process_lm_host_announce: os=(%d,%d) ttl=%d server type=%08x comment=%s\n",
 454                 osmajor, osminor, ttl, servertype,comment));
 455
 456         if ((osmajor < 36) || (osmajor > 38) || (osminor !=0)) {
 457                 DEBUG(5,("process_lm_host_announce: LM Announcement packet does not \
 458 originate from OS/2 Warp client. Ignoring packet.\n"));
 459                 /* Could have been from a Windows machine (with its LM Announce enabled),
 460                         or a Samba server. Then don't disrupt the current browse list. */
 461                 goto done;
 462         }
 463
 464         /* Filter servertype to remove impossible bits. */
 465         servertype &= ~(SV_TYPE_LOCAL_LIST_ONLY|SV_TYPE_DOMAIN_ENUM);
 466
 467         /* A LanMan host announcement must be sent to the name WORKGROUP<00>. */
 468         if(dgram->dest_name.name_type != 0x00) {
 469                 DEBUG(2,("process_lm_host_announce: incorrect name type for destination from IP %s \
 470 (was %02x) should be 0x00. Allowing packet anyway.\n",
 471                         inet_ntoa(p->ip), dgram->dest_name.name_type));
 472                 /* Change it so it was. */
 473                 dgram->dest_name.name_type = 0x00;
 474         }
 475
 476         /*
 477          * Syntax servers version 5.1 send HostAnnounce packets to
 478          * *THE WRONG NAME*. They send to LOCAL_MASTER_BROWSER_NAME<00>
 479          * instead of WORKGROUP<1d> name. So to fix this we check if
 480          * the workgroup name is our own name, and if so change it
 481          * to be our primary workgroup name. This code is probably
 482          * not needed in the LanMan announce code, but it won't hurt.
 483          */
 484
 485         if(strequal(work_name, global_myname()))
 486                 unstrcpy(work_name,lp_workgroup());
 487
 488         /*
 489          * We are being very agressive here in adding a workgroup
 490          * name on the basis of a host announcing itself as being
 491          * in that workgroup. Maybe we should wait for the workgroup
 492          * announce instead ? JRA.
 493          */
 494
 495         work = find_workgroup_on_subnet(subrec, work_name);
 496
 497         if(servertype != 0) {
 498                 if (work == NULL) {
 499                         /* We have no record of this workgroup. Add it. */
 500                         if((work = create_workgroup_on_subnet(subrec, work_name, ttl))==NULL)
 501                                 goto done;
 502                 }
 503
 504                 if((servrec = find_server_in_workgroup( work, announce_name))==NULL) {
 505                         /* If this server is not already in the workgroup, add it. */
 506                         create_server_on_workgroup(work, announce_name,
 507                                         servertype|SV_TYPE_LOCAL_LIST_ONLY,
 508                                         ttl, comment);
 509                 } else {
 510                         /* Update the record. */
 511                         servrec->serv.type = servertype|SV_TYPE_LOCAL_LIST_ONLY;
 512                         update_server_ttl( servrec, ttl);
 513                         fstrcpy(servrec->serv.comment,comment);
 514                 }
 515         } else {
 516                 /*
 517                  * This server is announcing it is going down. Remove it from the
 518                  * workgroup.
 519                  */
 520                 if(!is_myname(announce_name) && (work != NULL) &&
 521                                 ((servrec = find_server_in_workgroup( work, announce_name))!=NULL)) {
 522                         remove_server_from_workgroup( work, servrec);
 523                 }
 524         }
 525
 526         subrec->work_changed = True;
 527         found_lm_clients = True;
 528
 529 done:
 530
 531         END_PROFILE(lm_host_announce);
 532 }
 533
 534 /****************************************************************************
 535   Send a backup list response.
 536 *****************************************************************************/
 537
 538 static void send_backup_list_response(struct subnet_record *subrec,
 539                                       struct work_record *work,
 540                                       struct nmb_name *send_to_name,
 541                                       unsigned char max_number_requested,
 542                                       uint32 token, struct in_addr sendto_ip,
 543                                       int port)
 544 {
 545         char outbuf[1024];
 546         char *p, *countptr;
 547         unsigned int count = 0;
 548         unstring send_to_namestr;
 549 #if 0
 550   struct server_record *servrec;
 551 #endif
 552         unstring myname;
 553
 554         memset(outbuf,'\0',sizeof(outbuf));
 555
 556         DEBUG(3,("send_backup_list_response: sending backup list for workgroup %s to %s IP %s\n",
 557                 work->work_group, nmb_namestr(send_to_name), inet_ntoa(sendto_ip)));
 558
 559         p = outbuf;
 560
 561         SCVAL(p,0,ANN_GetBackupListResp); /* Backup list response opcode. */
 562         p++;
 563
 564         countptr = p;
 565         p++;
 566
 567         SIVAL(p,0,token); /* The sender's unique info. */
 568         p += 4;
 569
 570         /* We always return at least one name - our own. */
 571         count = 1;
 572         unstrcpy(myname, global_myname());
 573         strupper_m(myname);
 574         myname[15]='\0';
 575         push_pstring_base(p, myname, outbuf);
 576
 577         p = skip_string(outbuf,sizeof(outbuf),p,1);
 578
 579         /* Look for backup browsers in this workgroup. */
 580
 581 #if 0
 582   /* we don't currently send become_backup requests so we should never
 583      send any other servers names out as backups for our
 584      workgroup. That's why this is commented out (tridge) */
 585
 586   /*
 587    * NB. Note that the struct work_record here is not neccessarily
 588    * attached to the subnet *subrec.
 589    */
 590
 591   for (servrec = work->serverlist; servrec; servrec = servrec->next)
 592   {
 593     int len = PTR_DIFF(p, outbuf);
 594     if((sizeof(outbuf) - len) < 16)
 595       break;
 596
 597     if(count >= (unsigned int)max_number_requested)
 598       break;
 599
 600     if(strnequal(servrec->serv.name, global_myname(),15))
 601       continue;
 602
 603     if(!(servrec->serv.type & SV_TYPE_BACKUP_BROWSER))
 604       continue;
 605
 606     StrnCpy(p, servrec->serv.name, 15);
 607     strupper_m(p);
 608     count++;
 609
 610     DEBUG(5,("send_backup_list_response: Adding server %s number %d\n",
 611               p, count));
 612
 613     p = skip_string(outbuf,sizeof(outbuf),p,1);
 614   }
 615 #endif
 616
 617         SCVAL(countptr, 0, count);
 618
 619         pull_ascii_nstring(send_to_namestr, sizeof(send_to_namestr), send_to_name->name);
 620
 621         DEBUG(4,("send_backup_list_response: sending response to %s<00> IP %s with %d servers.\n",
 622                 send_to_namestr, inet_ntoa(sendto_ip), count));
 623
 624         send_mailslot(True, BROWSE_MAILSLOT,
 625                 outbuf,PTR_DIFF(p,outbuf),
 626                 global_myname(), 0,
 627                 send_to_namestr,0,
 628                 sendto_ip, subrec->myip, port);
 629 }
 630
 631 /*******************************************************************
 632   Process a send backup list request packet.
 633
 634   A client sends a backup list request to ask for a list of servers on
 635   the net that maintain server lists for a domain. A server is then
 636   chosen from this list to send NetServerEnum commands to to list
 637   available servers.
 638
 639 ********************************************************************/
 640
 641 void process_get_backup_list_request(struct subnet_record *subrec,
 642                                      struct packet_struct *p,char *buf)
 643 {
 644         struct dgram_packet *dgram = &p->packet.dgram;
 645         struct work_record *work;
 646         unsigned char max_number_requested = CVAL(buf,0);
 647         uint32 token = IVAL(buf,1); /* Sender's key index for the workgroup. */
 648         int name_type = dgram->dest_name.name_type;
 649         unstring workgroup_name;
 650         struct subnet_record *search_subrec = subrec;
 651
 652         START_PROFILE(get_backup_list);
 653         pull_ascii_nstring(workgroup_name, sizeof(workgroup_name), dgram->dest_name.name);
 654
 655         DEBUG(3,("process_get_backup_list_request: request from %s IP %s to %s.\n",
 656                 nmb_namestr(&dgram->source_name), inet_ntoa(p->ip),
 657                 nmb_namestr(&dgram->dest_name)));
 658
 659         /* We have to be a master browser, or a domain master browser
 660                 for the requested workgroup. That means it must be our
 661                 workgroup. */
 662
 663         if(strequal(workgroup_name, lp_workgroup()) == False) {
 664                 DEBUG(7,("process_get_backup_list_request: Ignoring announce request for workgroup %s.\n",
 665                         workgroup_name));
 666                 goto done;
 667         }
 668
 669         if((work = find_workgroup_on_subnet(search_subrec, workgroup_name)) == NULL) {
 670                 DEBUG(0,("process_get_backup_list_request: Cannot find workgroup %s on \
 671 subnet %s.\n", workgroup_name, search_subrec->subnet_name));
 672                 goto done;
 673         }
 674
 675         /*
 676          * If the packet was sent to WORKGROUP<1b> instead
 677          * of WORKGROUP<1d> then it was unicast to us a domain master
 678          * browser. Change search subrec to unicast.
 679          */
 680
 681         if(name_type == 0x1b) {
 682                 /* We must be a domain master browser in order to
 683                         process this packet. */
 684
 685                 if(!AM_DOMAIN_MASTER_BROWSER(work)) {
 686                         DEBUG(0,("process_get_backup_list_request: domain list requested for workgroup %s \
 687 and I am not a domain master browser.\n", workgroup_name));
 688                         goto done;
 689                 }
 690
 691                 search_subrec = unicast_subnet;
 692         } else if (name_type == 0x1d) {
 693                 /* We must be a local master browser in order to process this packet. */
 694
 695                 if(!AM_LOCAL_MASTER_BROWSER(work)) {
 696                         DEBUG(0,("process_get_backup_list_request: domain list requested for workgroup %s \
 697 and I am not a local master browser.\n", workgroup_name));
 698                         goto done;
 699                 }
 700         } else {
 701                 DEBUG(0,("process_get_backup_list_request: Invalid name type %x - should be 0x1b or 0x1d.\n",
 702                         name_type));
 703                 goto done;
 704         }
 705
 706         send_backup_list_response(subrec, work, &dgram->source_name,
 707                         max_number_requested, token, p->ip, p->port);
 708
 709 done:
 710
 711         END_PROFILE(get_backup_list);
 712 }
 713
 714 /*******************************************************************
 715   Process a reset browser state packet.
 716
 717   Diagnostic packet:
 718   0x1 - Stop being a master browser and become a backup browser.
 719   0x2 - Discard browse lists, stop being a master browser, try again.
 720   0x4 - Stop being a master browser forever.
 721
 722 ******************************************************************/
 723
 724 void process_reset_browser(struct subnet_record *subrec,
 725                                   struct packet_struct *p,char *buf)
 726 {
 727         struct dgram_packet *dgram = &p->packet.dgram;
 728         int state = CVAL(buf,0);
 729         struct subnet_record *sr;
 730
 731         START_PROFILE(reset_browser);
 732
 733         DEBUG(1,("process_reset_browser: received diagnostic browser reset \
 734 request from %s IP %s state=0x%X\n",
 735                 nmb_namestr(&dgram->source_name), inet_ntoa(p->ip), state));
 736
 737         /* Stop being a local master browser on all our broadcast subnets. */
 738         if (state & 0x1) {
 739                 for (sr = FIRST_SUBNET; sr; sr = NEXT_SUBNET_EXCLUDING_UNICAST(sr)) {
 740                         struct work_record *work;
 741                         for (work = sr->workgrouplist; work; work = work->next) {
 742                                 if (AM_LOCAL_MASTER_BROWSER(work))
 743                                         unbecome_local_master_browser(sr, work, True);
 744                         }
 745                 }
 746         }
 747
 748         /* Discard our browse lists. */
 749         if (state & 0x2) {
 750                 /*
 751                  * Calling expire_workgroups_and_servers with a -1
 752                  * time causes all servers not marked with a PERMANENT_TTL
 753                  * on the workgroup lists to be discarded, and all
 754                  * workgroups with empty server lists to be discarded.
 755                  * This means we keep our own server names and workgroup
 756                  * as these have a PERMANENT_TTL.
 757                  */
 758
 759                 expire_workgroups_and_servers(-1);
 760         }
 761
 762         /* Request to stop browsing altogether. */
 763         if (state & 0x4)
 764                 DEBUG(1,("process_reset_browser: ignoring request to stop being a browser.\n"));
 765
 766         END_PROFILE(reset_browser);
 767 }
 768
 769 /*******************************************************************
 770   Process an announcement request packet.
 771   We don't respond immediately, we just check it's a request for
 772   our workgroup and then set the flag telling the announce code
 773   in nmbd_sendannounce.c:announce_my_server_names that an
 774   announcement is needed soon.
 775 ******************************************************************/
 776
 777 void process_announce_request(struct subnet_record *subrec, struct packet_struct *p, char *buf)
 778 {
 779         struct dgram_packet *dgram = &p->packet.dgram;
 780         struct work_record *work;
 781         unstring workgroup_name;
 782
 783         START_PROFILE(announce_request);
 784
 785         pull_ascii_nstring(workgroup_name, sizeof(workgroup_name), dgram->dest_name.name);
 786         DEBUG(3,("process_announce_request: Announce request from %s IP %s to %s.\n",
 787                 nmb_namestr(&dgram->source_name), inet_ntoa(p->ip),
 788                 nmb_namestr(&dgram->dest_name)));
 789
 790         /* We only send announcement requests on our workgroup. */
 791         if(strequal(workgroup_name, lp_workgroup()) == False) {
 792                 DEBUG(7,("process_announce_request: Ignoring announce request for workgroup %s.\n",
 793                         workgroup_name));
 794                 goto done;
 795         }
 796
 797         if((work = find_workgroup_on_subnet(subrec, workgroup_name)) == NULL) {
 798                 DEBUG(0,("process_announce_request: Unable to find workgroup %s on subnet !\n",
 799                         workgroup_name));
 800                 goto done;
 801         }
 802
 803         work->needannounce = True;
 804 done:
 805
 806         END_PROFILE(announce_request);
 807 }
 808
 809 /*******************************************************************
 810   Process a LanMan announcement request packet.
 811   We don't respond immediately, we just check it's a request for
 812   our workgroup and then set the flag telling that we have found
 813   a LanMan client (DOS or OS/2) and that we will have to start
 814   sending LanMan announcements (unless specifically disabled
 815   through the "lm announce" parameter in smb.conf)
 816 ******************************************************************/
 817
 818 void process_lm_announce_request(struct subnet_record *subrec, struct packet_struct *p, char *buf, int len)
 819 {
 820         struct dgram_packet *dgram = &p->packet.dgram;
 821         unstring workgroup_name;
 822
 823         START_PROFILE(lm_announce_request);
 824
 825         pull_ascii_nstring(workgroup_name, sizeof(workgroup_name), dgram->dest_name.name);
 826         DEBUG(3,("process_lm_announce_request: Announce request from %s IP %s to %s.\n",
 827                 nmb_namestr(&dgram->source_name), inet_ntoa(p->ip),
 828                 nmb_namestr(&dgram->dest_name)));
 829
 830         /* We only send announcement requests on our workgroup. */
 831         if(strequal(workgroup_name, lp_workgroup()) == False) {
 832                 DEBUG(7,("process_lm_announce_request: Ignoring announce request for workgroup %s.\n",
 833                         workgroup_name));
 834                 goto done;
 835         }
 836
 837         if(find_workgroup_on_subnet(subrec, workgroup_name) == NULL) {
 838                 DEBUG(0,("process_announce_request: Unable to find workgroup %s on subnet !\n",
 839                         workgroup_name));
 840                 goto done;
 841         }
 842
 843         found_lm_clients = True;
 844
 845 done:
 846
 847         END_PROFILE(lm_announce_request);
 848 }