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 3 of the License, or
  11    (at your option) any later version.
  12
  13    This program is distributed in the hope that it will be useful,
  14    but WITHOUT ANY WARRANTY; without even the implied warranty of
  15    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  16    GNU General Public License for more details.
  17
  18    You should have received a copy of the GNU General Public License
  19    along with this program.  If not, see <http://www.gnu.org/licenses/>.
  20
  21 */
  22
  23 #include "includes.h"
  24 #include "../librpc/gen_ndr/svcctl.h"
  25 #include "nmbd/nmbd.h"
  26
  27 extern bool found_lm_clients;
  28
  29 #if 0
  30
  31 /* XXXX note: This function is currently unsuitable for use, as it
  32    does not properly check that a server is in a fit state to become
  33    a backup browser before asking it to be one.
  34    The code is left here to be worked on at a later date.
  35 */
  36
  37 /****************************************************************************
  38 Tell a server to become a backup browser
  39 **************************************************************************/
  40
  41 void tell_become_backup(void)
  42 {
  43   struct subnet_record *subrec;
  44   for (subrec = FIRST_SUBNET; subrec; subrec = NEXT_SUBNET_EXCLUDING_UNICAST(subrec))
  45   {
  46     struct work_record *work;
  47     for (work = subrec->workgrouplist; work; work = work->next)
  48     {
  49       struct server_record *servrec;
  50       int num_servers = 0;
  51       int num_backups = 0;
  52
  53       for (servrec = work->serverlist; servrec; servrec = servrec->next)
  54       {
  55         num_servers++;
  56
  57         if (is_myname(servrec->serv.name))
  58           continue;
  59
  60         if (servrec->serv.type & SV_TYPE_BACKUP_BROWSER)
  61         {
  62           num_backups++;
  63           continue;
  64         }
  65
  66         if (servrec->serv.type & SV_TYPE_MASTER_BROWSER)
  67           continue;
  68
  69         if (!(servrec->serv.type & SV_TYPE_POTENTIAL_BROWSER))
  70           continue;
  71
  72         DEBUG(3,("num servers: %d num backups: %d\n",
  73               num_servers, num_backups));
  74
  75         /* make first server a backup server. thereafter make every
  76            tenth server a backup server */
  77         if (num_backups != 0 && (num_servers+9) / num_backups > 10)
  78           continue;
  79
  80         DEBUG(2,("sending become backup to %s %s for %s\n",
  81              servrec->serv.name, inet_ntoa(subrec->bcast_ip),
  82              work->work_group));
  83
  84         /* type 11 request from MYNAME(20) to WG(1e) for SERVER */
  85         do_announce_request(servrec->serv.name, work->work_group,
  86               ANN_BecomeBackup, 0x20, 0x1e, subrec->bcast_ip);
  87       }
  88     }
  89   }
  90 }
  91 #endif
  92
  93 /*******************************************************************
  94   Process an incoming host announcement packet.
  95 *******************************************************************/
  96
  97 void process_host_announce(struct subnet_record *subrec, struct packet_struct *p, char *buf)
  98 {
  99         struct dgram_packet *dgram = &p->packet.dgram;
 100         int ttl = IVAL(buf,1)/1000;
 101         unstring announce_name;
 102         uint32 servertype = IVAL(buf,23);
 103         fstring comment;
 104         struct work_record *work;
 105         struct server_record *servrec;
 106         unstring work_name;
 107         unstring source_name;
 108
 109         START_PROFILE(host_announce);
 110
 111         pull_ascii_fstring(comment, buf+31);
 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 = NULL;
 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         pull_ascii_nstring(source_name, sizeof(source_name), dgram->source_name.name);
 271         pull_ascii_nstring(work_name, sizeof(work_name), dgram->dest_name.name);
 272
 273         DEBUG(3,("process_local_master_announce: from %s<%02x> IP %s to \
 274 %s for server %s.\n", source_name, source_name[15], inet_ntoa(p->ip),
 275                 nmb_namestr(&dgram->dest_name),server_name));
 276
 277         DEBUG(5,("process_local_master_announce: ttl=%d server type=%08x comment=%s\n",
 278                 ttl, servertype, comment));
 279
 280         /* A local master announcement must be sent to the name WORKGROUP<1e>. */
 281         if(dgram->dest_name.name_type != 0x1e) {
 282                 DEBUG(0,("process_local_master_announce: incorrect name type for destination from IP %s \
 283 (was %02x) should be 0x1e. Ignoring packet.\n",
 284                         inet_ntoa(p->ip), dgram->dest_name.name_type));
 285                 goto done;
 286         }
 287
 288         /* Filter servertype to remove impossible bits. */
 289         servertype &= ~(SV_TYPE_LOCAL_LIST_ONLY|SV_TYPE_DOMAIN_ENUM);
 290
 291         /* For a local master announce the workgroup name is the destination name. */
 292
 293         if ((work = find_workgroup_on_subnet(subrec, work_name))==NULL) {
 294                 /* Don't bother adding if it's a local master release announce. */
 295                 if(servertype == 0)
 296                         goto done;
 297
 298                 /* We have no record of this workgroup. Add it. */
 299                 if((work = create_workgroup_on_subnet(subrec, work_name, ttl))==NULL)
 300                         goto done;
 301         }
 302
 303         /* If we think we're the local master browser for this workgroup,
 304                 we should never have got this packet. We don't see our own
 305                 packets.
 306         */
 307         if(AM_LOCAL_MASTER_BROWSER(work)) {
 308                 DEBUG(0,("process_local_master_announce: Server %s at IP %s is announcing itself as \
 309 a local master browser for workgroup %s and we think we are master. Forcing election.\n",
 310                         server_name, inet_ntoa(p->ip), work_name));
 311
 312                 /* Samba nmbd versions 1.9.17 to 1.9.17p4 have a bug in that when
 313                  they have become a local master browser once, they will never
 314                  stop sending local master announcements. To fix this we send
 315                  them a reset browser packet, with level 0x2 on the __SAMBA__
 316                  name that only they should be listening to. */
 317
 318                 send_browser_reset( 0x2, "__SAMBA__" , 0x20, p->ip);
 319
 320                 /* We should demote ourself and force an election. */
 321
 322                 unbecome_local_master_browser( subrec, work, True);
 323
 324                 /* The actual election requests are handled in nmbd_election.c */
 325                 goto done;
 326         }
 327
 328         /* Find the server record on this workgroup. If it doesn't exist, add it. */
 329
 330         if(servertype != 0) {
 331                 if((servrec = find_server_in_workgroup( work, server_name))==NULL) {
 332                         /* If this server is not already in the workgroup, add it. */
 333                         create_server_on_workgroup(work, server_name,
 334                                 servertype|SV_TYPE_LOCAL_LIST_ONLY,
 335                                 ttl, comment);
 336                 } else {
 337                         /* Update the record. */
 338                         servrec->serv.type = servertype|SV_TYPE_LOCAL_LIST_ONLY;
 339                         update_server_ttl(servrec, ttl);
 340                         fstrcpy(servrec->serv.comment,comment);
 341                 }
 342
 343                 set_workgroup_local_master_browser_name( work, server_name );
 344         } else {
 345                 /*
 346                  * This server is announcing it is going down. Remove it from the
 347                  * workgroup.
 348                  */
 349                 if(!is_myname(server_name) &&
 350                                 ((servrec = find_server_in_workgroup( work, server_name))!=NULL)) {
 351                         remove_server_from_workgroup( work, servrec);
 352                 }
 353         }
 354
 355         subrec->work_changed = True;
 356 done:
 357
 358         END_PROFILE(local_master_announce);
 359 }
 360
 361 /*******************************************************************
 362   Process a domain master announcement frame.
 363   Domain master browsers receive these from local masters. The Domain
 364   master should then issue a sync with the local master, asking for
 365   that machines local server list.
 366 ******************************************************************/
 367
 368 void process_master_browser_announce(struct subnet_record *subrec,
 369                                      struct packet_struct *p,char *buf)
 370 {
 371         unstring local_master_name;
 372         struct work_record *work;
 373         struct browse_cache_record *browrec;
 374
 375         START_PROFILE(master_browser_announce);
 376
 377         pull_ascii_nstring(local_master_name,sizeof(local_master_name),buf);
 378
 379         DEBUG(3,("process_master_browser_announce: Local master announce from %s IP %s.\n",
 380                 local_master_name, inet_ntoa(p->ip)));
 381
 382         if (!lp_domain_master()) {
 383                 DEBUG(0,("process_master_browser_announce: Not configured as domain \
 384 master - ignoring master announce.\n"));
 385                 goto done;
 386         }
 387
 388         if((work = find_workgroup_on_subnet(subrec, lp_workgroup())) == NULL) {
 389                 DEBUG(0,("process_master_browser_announce: Cannot find workgroup %s on subnet %s\n",
 390                         lp_workgroup(), subrec->subnet_name));
 391                 goto done;
 392         }
 393
 394         if(!AM_DOMAIN_MASTER_BROWSER(work)) {
 395                 DEBUG(0,("process_master_browser_announce: Local master announce made to us from \
 396 %s IP %s and we are not a domain master browser.\n", local_master_name, inet_ntoa(p->ip)));
 397                 goto done;
 398         }
 399
 400         /* Add this host as a local master browser entry on the browse lists.
 401                 This causes a sync request to be made to it at a later date.
 402         */
 403
 404         if((browrec = find_browser_in_lmb_cache( local_master_name )) == NULL) {
 405                 /* Add it. */
 406                 create_browser_in_lmb_cache( work->work_group, local_master_name, p->ip);
 407         } else {
 408                 update_browser_death_time(browrec);
 409         }
 410
 411 done:
 412
 413         END_PROFILE(master_browser_announce);
 414 }
 415
 416 /*******************************************************************
 417   Process an incoming LanMan host announcement packet.
 418 *******************************************************************/
 419
 420 void process_lm_host_announce(struct subnet_record *subrec, struct packet_struct *p, char *buf, int len)
 421 {
 422         struct dgram_packet *dgram = &p->packet.dgram;
 423         uint32 servertype = IVAL(buf,1);
 424         int osmajor=CVAL(buf,5);           /* major version of node software */
 425         int osminor=CVAL(buf,6);           /* minor version of node software */
 426         int ttl = SVAL(buf,7);
 427         unstring announce_name;
 428         struct work_record *work;
 429         struct server_record *servrec;
 430         unstring work_name;
 431         unstring source_name;
 432         fstring comment;
 433         char *s = get_safe_str_ptr(buf,len,buf,9);
 434
 435         START_PROFILE(lm_host_announce);
 436         if (!s) {
 437                 goto done;
 438         }
 439         s = skip_string(buf,len,s);
 440         if (!s) {
 441                 goto done;
 442         }
 443         pull_ascii(comment, s, sizeof(fstring), 43, STR_TERMINATE);
 444
 445         pull_ascii_nstring(announce_name,sizeof(announce_name),buf+9);
 446         pull_ascii_nstring(source_name,sizeof(source_name),dgram->source_name.name);
 447         /* For a LanMan host announce the workgroup name is the destination name. */
 448         pull_ascii_nstring(work_name,sizeof(work_name),dgram->dest_name.name);
 449
 450         DEBUG(3,("process_lm_host_announce: LM Announcement from %s IP %s to \
 451 %s for server %s.\n", nmb_namestr(&dgram->source_name), inet_ntoa(p->ip),
 452                 nmb_namestr(&dgram->dest_name),announce_name));
 453
 454         DEBUG(5,("process_lm_host_announce: os=(%d,%d) ttl=%d server type=%08x comment=%s\n",
 455                 osmajor, osminor, ttl, servertype,comment));
 456
 457         if ((osmajor < 36) || (osmajor > 38) || (osminor !=0)) {
 458                 DEBUG(5,("process_lm_host_announce: LM Announcement packet does not \
 459 originate from OS/2 Warp client. Ignoring packet.\n"));
 460                 /* Could have been from a Windows machine (with its LM Announce enabled),
 461                         or a Samba server. Then don't disrupt the current browse list. */
 462                 goto done;
 463         }
 464
 465         /* Filter servertype to remove impossible bits. */
 466         servertype &= ~(SV_TYPE_LOCAL_LIST_ONLY|SV_TYPE_DOMAIN_ENUM);
 467
 468         /* A LanMan host announcement must be sent to the name WORKGROUP<00>. */
 469         if(dgram->dest_name.name_type != 0x00) {
 470                 DEBUG(2,("process_lm_host_announce: incorrect name type for destination from IP %s \
 471 (was %02x) should be 0x00. Allowing packet anyway.\n",
 472                         inet_ntoa(p->ip), dgram->dest_name.name_type));
 473                 /* Change it so it was. */
 474                 dgram->dest_name.name_type = 0x00;
 475         }
 476
 477         /*
 478          * Syntax servers version 5.1 send HostAnnounce packets to
 479          * *THE WRONG NAME*. They send to LOCAL_MASTER_BROWSER_NAME<00>
 480          * instead of WORKGROUP<1d> name. So to fix this we check if
 481          * the workgroup name is our own name, and if so change it
 482          * to be our primary workgroup name. This code is probably
 483          * not needed in the LanMan announce code, but it won't hurt.
 484          */
 485
 486         if(strequal(work_name, global_myname()))
 487                 unstrcpy(work_name,lp_workgroup());
 488
 489         /*
 490          * We are being very agressive here in adding a workgroup
 491          * name on the basis of a host announcing itself as being
 492          * in that workgroup. Maybe we should wait for the workgroup
 493          * announce instead ? JRA.
 494          */
 495
 496         work = find_workgroup_on_subnet(subrec, work_name);
 497
 498         if(servertype != 0) {
 499                 if (work == NULL) {
 500                         /* We have no record of this workgroup. Add it. */
 501                         if((work = create_workgroup_on_subnet(subrec, work_name, ttl))==NULL)
 502                                 goto done;
 503                 }
 504
 505                 if((servrec = find_server_in_workgroup( work, announce_name))==NULL) {
 506                         /* If this server is not already in the workgroup, add it. */
 507                         create_server_on_workgroup(work, announce_name,
 508                                         servertype|SV_TYPE_LOCAL_LIST_ONLY,
 509                                         ttl, comment);
 510                 } else {
 511                         /* Update the record. */
 512                         servrec->serv.type = servertype|SV_TYPE_LOCAL_LIST_ONLY;
 513                         update_server_ttl( servrec, ttl);
 514                         fstrcpy(servrec->serv.comment,comment);
 515                 }
 516         } else {
 517                 /*
 518                  * This server is announcing it is going down. Remove it from the
 519                  * workgroup.
 520                  */
 521                 if(!is_myname(announce_name) && (work != NULL) &&
 522                                 ((servrec = find_server_in_workgroup( work, announce_name))!=NULL)) {
 523                         remove_server_from_workgroup( work, servrec);
 524                 }
 525         }
 526
 527         subrec->work_changed = True;
 528         found_lm_clients = True;
 529
 530 done:
 531
 532         END_PROFILE(lm_host_announce);
 533 }
 534
 535 /****************************************************************************
 536   Send a backup list response.
 537 *****************************************************************************/
 538
 539 static void send_backup_list_response(struct subnet_record *subrec,
 540                                       struct work_record *work,
 541                                       struct nmb_name *send_to_name,
 542                                       unsigned char max_number_requested,
 543                                       uint32 token, struct in_addr sendto_ip,
 544                                       int port)
 545 {
 546         char outbuf[1024];
 547         char *p, *countptr;
 548         unsigned int count = 0;
 549         unstring send_to_namestr;
 550 #if 0
 551   struct server_record *servrec;
 552 #endif
 553         unstring myname;
 554
 555         memset(outbuf,'\0',sizeof(outbuf));
 556
 557         DEBUG(3,("send_backup_list_response: sending backup list for workgroup %s to %s IP %s\n",
 558                 work->work_group, nmb_namestr(send_to_name), inet_ntoa(sendto_ip)));
 559
 560         p = outbuf;
 561
 562         SCVAL(p,0,ANN_GetBackupListResp); /* Backup list response opcode. */
 563         p++;
 564
 565         countptr = p;
 566         p++;
 567
 568         SIVAL(p,0,token); /* The sender's unique info. */
 569         p += 4;
 570
 571         /* We always return at least one name - our own. */
 572         count = 1;
 573         unstrcpy(myname, global_myname());
 574         strupper_m(myname);
 575         myname[15]='\0';
 576         push_ascii(p, myname, sizeof(outbuf)-PTR_DIFF(p,outbuf)-1, STR_TERMINATE);
 577
 578         p = skip_string(outbuf,sizeof(outbuf),p);
 579
 580         /* Look for backup browsers in this workgroup. */
 581
 582 #if 0
 583   /* we don't currently send become_backup requests so we should never
 584      send any other servers names out as backups for our
 585      workgroup. That's why this is commented out (tridge) */
 586
 587   /*
 588    * NB. Note that the struct work_record here is not neccessarily
 589    * attached to the subnet *subrec.
 590    */
 591
 592   for (servrec = work->serverlist; servrec; servrec = servrec->next)
 593   {
 594     int len = PTR_DIFF(p, outbuf);
 595     if((sizeof(outbuf) - len) < 16)
 596       break;
 597
 598     if(count >= (unsigned int)max_number_requested)
 599       break;
 600
 601     if(strnequal(servrec->serv.name, global_myname(),15))
 602       continue;
 603
 604     if(!(servrec->serv.type & SV_TYPE_BACKUP_BROWSER))
 605       continue;
 606
 607     StrnCpy(p, servrec->serv.name, 15);
 608     strupper_m(p);
 609     count++;
 610
 611     DEBUG(5,("send_backup_list_response: Adding server %s number %d\n",
 612               p, count));
 613
 614     p = skip_string(outbuf,sizeof(outbuf),p);
 615   }
 616 #endif
 617
 618         SCVAL(countptr, 0, count);
 619
 620         pull_ascii_nstring(send_to_namestr, sizeof(send_to_namestr), send_to_name->name);
 621
 622         DEBUG(4,("send_backup_list_response: sending response to %s<00> IP %s with %d servers.\n",
 623                 send_to_namestr, inet_ntoa(sendto_ip), count));
 624
 625         send_mailslot(True, BROWSE_MAILSLOT,
 626                 outbuf,PTR_DIFF(p,outbuf),
 627                 global_myname(), 0,
 628                 send_to_namestr,0,
 629                 sendto_ip, subrec->myip, port);
 630 }
 631
 632 /*******************************************************************
 633   Process a send backup list request packet.
 634
 635   A client sends a backup list request to ask for a list of servers on
 636   the net that maintain server lists for a domain. A server is then
 637   chosen from this list to send NetServerEnum commands to to list
 638   available servers.
 639
 640 ********************************************************************/
 641
 642 void process_get_backup_list_request(struct subnet_record *subrec,
 643                                      struct packet_struct *p,char *buf)
 644 {
 645         struct dgram_packet *dgram = &p->packet.dgram;
 646         struct work_record *work;
 647         unsigned char max_number_requested = CVAL(buf,0);
 648         uint32 token = IVAL(buf,1); /* Sender's key index for the workgroup. */
 649         int name_type = dgram->dest_name.name_type;
 650         unstring workgroup_name;
 651         struct subnet_record *search_subrec = subrec;
 652
 653         START_PROFILE(get_backup_list);
 654         pull_ascii_nstring(workgroup_name, sizeof(workgroup_name), dgram->dest_name.name);
 655
 656         DEBUG(3,("process_get_backup_list_request: request from %s IP %s to %s.\n",
 657                 nmb_namestr(&dgram->source_name), inet_ntoa(p->ip),
 658                 nmb_namestr(&dgram->dest_name)));
 659
 660         /* We have to be a master browser, or a domain master browser
 661                 for the requested workgroup. That means it must be our
 662                 workgroup. */
 663
 664         if(strequal(workgroup_name, lp_workgroup()) == False) {
 665                 DEBUG(7,("process_get_backup_list_request: Ignoring announce request for workgroup %s.\n",
 666                         workgroup_name));
 667                 goto done;
 668         }
 669
 670         if((work = find_workgroup_on_subnet(search_subrec, workgroup_name)) == NULL) {
 671                 DEBUG(0,("process_get_backup_list_request: Cannot find workgroup %s on \
 672 subnet %s.\n", workgroup_name, search_subrec->subnet_name));
 673                 goto done;
 674         }
 675
 676         /*
 677          * If the packet was sent to WORKGROUP<1b> instead
 678          * of WORKGROUP<1d> then it was unicast to us a domain master
 679          * browser. Change search subrec to unicast.
 680          */
 681
 682         if(name_type == 0x1b) {
 683                 /* We must be a domain master browser in order to
 684                         process this packet. */
 685
 686                 if(!AM_DOMAIN_MASTER_BROWSER(work)) {
 687                         DEBUG(0,("process_get_backup_list_request: domain list requested for workgroup %s \
 688 and I am not a domain master browser.\n", workgroup_name));
 689                         goto done;
 690                 }
 691
 692                 search_subrec = unicast_subnet;
 693         } else if (name_type == 0x1d) {
 694                 /* We must be a local master browser in order to process this packet. */
 695
 696                 if(!AM_LOCAL_MASTER_BROWSER(work)) {
 697                         DEBUG(0,("process_get_backup_list_request: domain list requested for workgroup %s \
 698 and I am not a local master browser.\n", workgroup_name));
 699                         goto done;
 700                 }
 701         } else {
 702                 DEBUG(0,("process_get_backup_list_request: Invalid name type %x - should be 0x1b or 0x1d.\n",
 703                         name_type));
 704                 goto done;
 705         }
 706
 707         send_backup_list_response(subrec, work, &dgram->source_name,
 708                         max_number_requested, token, p->ip, p->port);
 709
 710 done:
 711
 712         END_PROFILE(get_backup_list);
 713 }
 714
 715 /*******************************************************************
 716   Process a reset browser state packet.
 717
 718   Diagnostic packet:
 719   0x1 - Stop being a master browser and become a backup browser.
 720   0x2 - Discard browse lists, stop being a master browser, try again.
 721   0x4 - Stop being a master browser forever.
 722
 723 ******************************************************************/
 724
 725 void process_reset_browser(struct subnet_record *subrec,
 726                                   struct packet_struct *p,char *buf)
 727 {
 728         struct dgram_packet *dgram = &p->packet.dgram;
 729         int state = CVAL(buf,0);
 730         struct subnet_record *sr;
 731
 732         START_PROFILE(reset_browser);
 733
 734         DEBUG(1,("process_reset_browser: received diagnostic browser reset \
 735 request from %s IP %s state=0x%X\n",
 736                 nmb_namestr(&dgram->source_name), inet_ntoa(p->ip), state));
 737
 738         /* Stop being a local master browser on all our broadcast subnets. */
 739         if (state & 0x1) {
 740                 for (sr = FIRST_SUBNET; sr; sr = NEXT_SUBNET_EXCLUDING_UNICAST(sr)) {
 741                         struct work_record *work;
 742                         for (work = sr->workgrouplist; work; work = work->next) {
 743                                 if (AM_LOCAL_MASTER_BROWSER(work))
 744                                         unbecome_local_master_browser(sr, work, True);
 745                         }
 746                 }
 747         }
 748
 749         /* Discard our browse lists. */
 750         if (state & 0x2) {
 751                 /*
 752                  * Calling expire_workgroups_and_servers with a -1
 753                  * time causes all servers not marked with a PERMANENT_TTL
 754                  * on the workgroup lists to be discarded, and all
 755                  * workgroups with empty server lists to be discarded.
 756                  * This means we keep our own server names and workgroup
 757                  * as these have a PERMANENT_TTL.
 758                  */
 759
 760                 expire_workgroups_and_servers(-1);
 761         }
 762
 763         /* Request to stop browsing altogether. */
 764         if (state & 0x4)
 765                 DEBUG(1,("process_reset_browser: ignoring request to stop being a browser.\n"));
 766
 767         END_PROFILE(reset_browser);
 768 }
 769
 770 /*******************************************************************
 771   Process an announcement request packet.
 772   We don't respond immediately, we just check it's a request for
 773   our workgroup and then set the flag telling the announce code
 774   in nmbd_sendannounce.c:announce_my_server_names that an
 775   announcement is needed soon.
 776 ******************************************************************/
 777
 778 void process_announce_request(struct subnet_record *subrec, struct packet_struct *p, char *buf)
 779 {
 780         struct dgram_packet *dgram = &p->packet.dgram;
 781         struct work_record *work;
 782         unstring workgroup_name;
 783
 784         START_PROFILE(announce_request);
 785
 786         pull_ascii_nstring(workgroup_name, sizeof(workgroup_name), dgram->dest_name.name);
 787         DEBUG(3,("process_announce_request: Announce request from %s IP %s to %s.\n",
 788                 nmb_namestr(&dgram->source_name), inet_ntoa(p->ip),
 789                 nmb_namestr(&dgram->dest_name)));
 790
 791         /* We only send announcement requests on our workgroup. */
 792         if(strequal(workgroup_name, lp_workgroup()) == False) {
 793                 DEBUG(7,("process_announce_request: Ignoring announce request for workgroup %s.\n",
 794                         workgroup_name));
 795                 goto done;
 796         }
 797
 798         if((work = find_workgroup_on_subnet(subrec, workgroup_name)) == NULL) {
 799                 DEBUG(0,("process_announce_request: Unable to find workgroup %s on subnet !\n",
 800                         workgroup_name));
 801                 goto done;
 802         }
 803
 804         work->needannounce = True;
 805 done:
 806
 807         END_PROFILE(announce_request);
 808 }
 809
 810 /*******************************************************************
 811   Process a LanMan announcement request packet.
 812   We don't respond immediately, we just check it's a request for
 813   our workgroup and then set the flag telling that we have found
 814   a LanMan client (DOS or OS/2) and that we will have to start
 815   sending LanMan announcements (unless specifically disabled
 816   through the "lm announce" parameter in smb.conf)
 817 ******************************************************************/
 818
 819 void process_lm_announce_request(struct subnet_record *subrec, struct packet_struct *p, char *buf, int len)
 820 {
 821         struct dgram_packet *dgram = &p->packet.dgram;
 822         unstring workgroup_name;
 823
 824         START_PROFILE(lm_announce_request);
 825
 826         pull_ascii_nstring(workgroup_name, sizeof(workgroup_name), dgram->dest_name.name);
 827         DEBUG(3,("process_lm_announce_request: Announce request from %s IP %s to %s.\n",
 828                 nmb_namestr(&dgram->source_name), inet_ntoa(p->ip),
 829                 nmb_namestr(&dgram->dest_name)));
 830
 831         /* We only send announcement requests on our workgroup. */
 832         if(strequal(workgroup_name, lp_workgroup()) == False) {
 833                 DEBUG(7,("process_lm_announce_request: Ignoring announce request for workgroup %s.\n",
 834                         workgroup_name));
 835                 goto done;
 836         }
 837
 838         if(find_workgroup_on_subnet(subrec, workgroup_name) == NULL) {
 839                 DEBUG(0,("process_announce_request: Unable to find workgroup %s on subnet !\n",
 840                         workgroup_name));
 841                 goto done;
 842         }
 843
 844         found_lm_clients = True;
 845
 846 done:
 847
 848         END_PROFILE(lm_announce_request);
 849 }