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