source3/nmbd/nmbd_sendannounce.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    SMB Version handling
   9    Copyright (C) John H Terpstra 1995-1998
  10
  11    This program is free software; you can redistribute it and/or modify
  12    it under the terms of the GNU General Public License as published by
  13    the Free Software Foundation; either version 2 of the License, or
  14    (at your option) any later version.
  15
  16    This program is distributed in the hope that it will be useful,
  17    but WITHOUT ANY WARRANTY; without even the implied warranty of
  18    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  19    GNU General Public License for more details.
  20
  21    You should have received a copy of the GNU General Public License
  22    along with this program; if not, write to the Free Software
  23    Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
  24
  25 */
  26
  27 #include "includes.h"
  28
  29 extern int  updatecount;
  30 extern BOOL found_lm_clients;
  31
  32 /****************************************************************************
  33  Send a browser reset packet.
  34 **************************************************************************/
  35
  36 void send_browser_reset(int reset_type, const char *to_name, int to_type, struct in_addr to_ip)
  37 {
  38         pstring outbuf;
  39         char *p;
  40
  41         DEBUG(3,("send_browser_reset: sending reset request type %d to %s<%02x> IP %s.\n",
  42                 reset_type, to_name, to_type, inet_ntoa(to_ip) ));
  43
  44         memset(outbuf,'\0',sizeof(outbuf));
  45         p = outbuf;
  46         SCVAL(p,0,ANN_ResetBrowserState);
  47         p++;
  48         SCVAL(p,0,reset_type);
  49         p++;
  50
  51         send_mailslot(True, BROWSE_MAILSLOT, outbuf,PTR_DIFF(p,outbuf),
  52                 global_myname(), 0x0, to_name, to_type, to_ip,
  53                 FIRST_SUBNET->myip, DGRAM_PORT);
  54 }
  55
  56 /****************************************************************************
  57   Broadcast a packet to the local net requesting that all servers in this
  58   workgroup announce themselves to us.
  59   **************************************************************************/
  60
  61 void broadcast_announce_request(struct subnet_record *subrec, struct work_record *work)
  62 {
  63         pstring outbuf;
  64         char *p;
  65
  66         work->needannounce = True;
  67
  68         DEBUG(3,("broadcast_announce_request: sending announce request for workgroup %s \
  69 to subnet %s\n", work->work_group, subrec->subnet_name));
  70
  71         memset(outbuf,'\0',sizeof(outbuf));
  72         p = outbuf;
  73         SCVAL(p,0,ANN_AnnouncementRequest);
  74         p++;
  75
  76         SCVAL(p,0,work->token); /* (local) Unique workgroup token id. */
  77         p++;
  78         p +=  push_string(NULL, p+1, global_myname(), 15, STR_ASCII|STR_UPPER|STR_TERMINATE);
  79
  80         send_mailslot(False, BROWSE_MAILSLOT, outbuf,PTR_DIFF(p,outbuf),
  81                 global_myname(), 0x0, work->work_group,0x1e, subrec->bcast_ip,
  82                 subrec->myip, DGRAM_PORT);
  83 }
  84
  85 /****************************************************************************
  86   Broadcast an announcement.
  87   **************************************************************************/
  88
  89 static void send_announcement(struct subnet_record *subrec, int announce_type,
  90                               const char *from_name, const char *to_name, int to_type, struct in_addr to_ip,
  91                               time_t announce_interval,
  92                               const char *server_name, int server_type, const char *server_comment)
  93 {
  94         pstring outbuf;
  95         char *p;
  96
  97         memset(outbuf,'\0',sizeof(outbuf));
  98         p = outbuf+1;
  99
 100         SCVAL(outbuf,0,announce_type);
 101
 102         /* Announcement parameters. */
 103         SCVAL(p,0,updatecount);
 104         SIVAL(p,1,announce_interval*1000); /* Milliseconds - despite the spec. */
 105
 106         push_string(NULL, p+5, server_name, 15, STR_ASCII|STR_UPPER|STR_TERMINATE);
 107
 108         SCVAL(p,21,lp_major_announce_version()); /* Major version. */
 109         SCVAL(p,22,lp_minor_announce_version()); /* Minor version. */
 110
 111         SIVAL(p,23,server_type & ~SV_TYPE_LOCAL_LIST_ONLY);
 112         /* Browse version: got from NT/AS 4.00  - Value defined in smb.h (JHT). */
 113         SSVAL(p,27,BROWSER_ELECTION_VERSION);
 114         SSVAL(p,29,BROWSER_CONSTANT); /* Browse signature. */
 115
 116         p += 31 + push_string(NULL, p+31, server_comment, -1, STR_ASCII|STR_TERMINATE);
 117
 118         send_mailslot(False,BROWSE_MAILSLOT, outbuf, PTR_DIFF(p,outbuf),
 119                         from_name, 0x0, to_name, to_type, to_ip, subrec->myip,
 120                         DGRAM_PORT);
 121 }
 122
 123 /****************************************************************************
 124   Broadcast a LanMan announcement.
 125 **************************************************************************/
 126
 127 static void send_lm_announcement(struct subnet_record *subrec, int announce_type,
 128                               char *from_name, char *to_name, int to_type, struct in_addr to_ip,
 129                               time_t announce_interval,
 130                               char *server_name, int server_type, char *server_comment)
 131 {
 132         pstring outbuf;
 133         char *p=outbuf;
 134
 135         memset(outbuf,'\0',sizeof(outbuf));
 136
 137         SSVAL(p,0,announce_type);
 138         SIVAL(p,2,server_type & ~SV_TYPE_LOCAL_LIST_ONLY);
 139         SCVAL(p,6,lp_major_announce_version()); /* Major version. */
 140         SCVAL(p,7,lp_minor_announce_version()); /* Minor version. */
 141         SSVAL(p,8,announce_interval);            /* In seconds - according to spec. */
 142
 143         p += 10;
 144         p += push_string(NULL, p, server_name, 15, STR_ASCII|STR_UPPER|STR_TERMINATE);
 145         p += push_string(NULL, p, server_comment, sizeof(pstring)-15, STR_ASCII|STR_UPPER|STR_TERMINATE);
 146
 147         send_mailslot(False,LANMAN_MAILSLOT, outbuf, PTR_DIFF(p,outbuf),
 148                 from_name, 0x0, to_name, to_type, to_ip, subrec->myip,
 149                 DGRAM_PORT);
 150 }
 151
 152 /****************************************************************************
 153  We are a local master browser. Announce this to WORKGROUP<1e>.
 154 ****************************************************************************/
 155
 156 static void send_local_master_announcement(struct subnet_record *subrec, struct work_record *work,
 157                                            struct server_record *servrec)
 158 {
 159         /* Ensure we don't have the prohibited bit set. */
 160         uint32 type = servrec->serv.type & ~SV_TYPE_LOCAL_LIST_ONLY;
 161
 162         DEBUG(3,("send_local_master_announcement: type %x for name %s on subnet %s for workgroup %s\n",
 163                 type, global_myname(), subrec->subnet_name, work->work_group));
 164
 165         send_announcement(subrec, ANN_LocalMasterAnnouncement,
 166                         global_myname(),                 /* From nbt name. */
 167                         work->work_group, 0x1e,          /* To nbt name. */
 168                         subrec->bcast_ip,                /* To ip. */
 169                         work->announce_interval,         /* Time until next announce. */
 170                         global_myname(),                 /* Name to announce. */
 171                         type,                            /* Type field. */
 172                         servrec->serv.comment);
 173 }
 174
 175 /****************************************************************************
 176  Announce the workgroup WORKGROUP to MSBROWSE<01>.
 177 ****************************************************************************/
 178
 179 static void send_workgroup_announcement(struct subnet_record *subrec, struct work_record *work)
 180 {
 181         DEBUG(3,("send_workgroup_announcement: on subnet %s for workgroup %s\n",
 182                 subrec->subnet_name, work->work_group));
 183
 184         send_announcement(subrec, ANN_DomainAnnouncement,
 185                         global_myname(),                 /* From nbt name. */
 186                         MSBROWSE, 0x1,                   /* To nbt name. */
 187                         subrec->bcast_ip,                /* To ip. */
 188                         work->announce_interval,         /* Time until next announce. */
 189                         work->work_group,                /* Name to announce. */
 190                         SV_TYPE_DOMAIN_ENUM|SV_TYPE_NT,  /* workgroup announce flags. */
 191                         global_myname());                /* From name as comment. */
 192 }
 193
 194 /****************************************************************************
 195  Announce the given host to WORKGROUP<1d>.
 196 ****************************************************************************/
 197
 198 static void send_host_announcement(struct subnet_record *subrec, struct work_record *work,
 199                                    struct server_record *servrec)
 200 {
 201         /* Ensure we don't have the prohibited bits set. */
 202         uint32 type = servrec->serv.type & ~SV_TYPE_LOCAL_LIST_ONLY;
 203
 204         DEBUG(3,("send_host_announcement: type %x for host %s on subnet %s for workgroup %s\n",
 205                 type, servrec->serv.name, subrec->subnet_name, work->work_group));
 206
 207         send_announcement(subrec, ANN_HostAnnouncement,
 208                         servrec->serv.name,              /* From nbt name. */
 209                         work->work_group, 0x1d,          /* To nbt name. */
 210                         subrec->bcast_ip,                /* To ip. */
 211                         work->announce_interval,         /* Time until next announce. */
 212                         servrec->serv.name,              /* Name to announce. */
 213                         type,                            /* Type field. */
 214                         servrec->serv.comment);
 215 }
 216
 217 /****************************************************************************
 218  Announce the given LanMan host
 219 ****************************************************************************/
 220
 221 static void send_lm_host_announcement(struct subnet_record *subrec, struct work_record *work,
 222                                    struct server_record *servrec, int lm_interval)
 223 {
 224         /* Ensure we don't have the prohibited bits set. */
 225         uint32 type = servrec->serv.type & ~SV_TYPE_LOCAL_LIST_ONLY;
 226
 227         DEBUG(3,("send_lm_host_announcement: type %x for host %s on subnet %s for workgroup %s, ttl: %d\n",
 228                 type, servrec->serv.name, subrec->subnet_name, work->work_group, lm_interval));
 229
 230         send_lm_announcement(subrec, ANN_HostAnnouncement,
 231                         servrec->serv.name,              /* From nbt name. */
 232                         work->work_group, 0x00,          /* To nbt name. */
 233                         subrec->bcast_ip,                /* To ip. */
 234                         lm_interval,                     /* Time until next announce. */
 235                         servrec->serv.name,              /* Name to announce (fstring not netbios name struct). */
 236                         type,                            /* Type field. */
 237                         servrec->serv.comment);
 238 }
 239
 240 /****************************************************************************
 241   Announce a server record.
 242   ****************************************************************************/
 243
 244 static void announce_server(struct subnet_record *subrec, struct work_record *work,
 245                      struct server_record *servrec)
 246 {
 247         /* Only do domain announcements if we are a master and it's
 248                 our primary name we're being asked to announce. */
 249
 250         if (AM_LOCAL_MASTER_BROWSER(work) && strequal(global_myname(),servrec->serv.name)) {
 251                 send_local_master_announcement(subrec, work, servrec);
 252                 send_workgroup_announcement(subrec, work);
 253         } else {
 254                 send_host_announcement(subrec, work, servrec);
 255         }
 256 }
 257
 258 /****************************************************************************
 259   Go through all my registered names on all broadcast subnets and announce
 260   them if the timeout requires it.
 261   **************************************************************************/
 262
 263 void announce_my_server_names(time_t t)
 264 {
 265         struct subnet_record *subrec;
 266
 267         for (subrec = FIRST_SUBNET; subrec; subrec = NEXT_SUBNET_EXCLUDING_UNICAST(subrec)) {
 268                 struct work_record *work = find_workgroup_on_subnet(subrec, lp_workgroup());
 269
 270                 if(work) {
 271                         struct server_record *servrec;
 272
 273                         if (work->needannounce) {
 274                                 /* Drop back to a max 3 minute announce. This is to prevent a
 275                                         single lost packet from breaking things for too long. */
 276
 277                                 work->announce_interval = MIN(work->announce_interval,
 278                                                         CHECK_TIME_MIN_HOST_ANNCE*60);
 279                                 work->lastannounce_time = t - (work->announce_interval+1);
 280                                 work->needannounce = False;
 281                         }
 282
 283                         /* Announce every minute at first then progress to every 12 mins */
 284                         if ((t - work->lastannounce_time) < work->announce_interval)
 285                                 continue;
 286
 287                         if (work->announce_interval < (CHECK_TIME_MAX_HOST_ANNCE * 60))
 288                                 work->announce_interval += 60;
 289
 290                         work->lastannounce_time = t;
 291
 292                         for (servrec = work->serverlist; servrec; servrec = servrec->next) {
 293                                 if (is_myname(servrec->serv.name))
 294                                         announce_server(subrec, work, servrec);
 295                         }
 296                 } /* if work */
 297         } /* for subrec */
 298 }
 299
 300 /****************************************************************************
 301   Go through all my registered names on all broadcast subnets and announce
 302   them as a LanMan server if the timeout requires it.
 303 **************************************************************************/
 304
 305 void announce_my_lm_server_names(time_t t)
 306 {
 307         struct subnet_record *subrec;
 308         static time_t last_lm_announce_time=0;
 309         int announce_interval = lp_lm_interval();
 310         int lm_announce = lp_lm_announce();
 311
 312         if ((announce_interval <= 0) || (lm_announce <= 0)) {
 313                 /* user absolutely does not want LM announcements to be sent. */
 314                 return;
 315         }
 316
 317         if ((lm_announce >= 2) && (!found_lm_clients)) {
 318                 /* has been set to 2 (Auto) but no LM clients detected (yet). */
 319                 return;
 320         }
 321
 322         /* Otherwise: must have been set to 1 (Yes), or LM clients *have*
 323                 been detected. */
 324
 325         for (subrec = FIRST_SUBNET; subrec; subrec = NEXT_SUBNET_EXCLUDING_UNICAST(subrec)) {
 326                 struct work_record *work = find_workgroup_on_subnet(subrec, lp_workgroup());
 327
 328                 if(work) {
 329                         struct server_record *servrec;
 330
 331                         if (last_lm_announce_time && ((t - last_lm_announce_time) < announce_interval ))
 332                                 continue;
 333
 334                         last_lm_announce_time = t;
 335
 336                         for (servrec = work->serverlist; servrec; servrec = servrec->next) {
 337                                 if (is_myname(servrec->serv.name))
 338                                         /* skipping equivalent of announce_server() */
 339                                         send_lm_host_announcement(subrec, work, servrec, announce_interval);
 340                         }
 341                 } /* if work */
 342         } /* for subrec */
 343 }
 344
 345 /* Announce timer. Moved into global static so it can be reset
 346    when a machine becomes a local master browser. */
 347 static time_t announce_timer_last=0;
 348
 349 /****************************************************************************
 350  Reset the announce_timer so that a local master browser announce will be done
 351  immediately.
 352  ****************************************************************************/
 353
 354 void reset_announce_timer(void)
 355 {
 356         announce_timer_last = time(NULL) - (CHECK_TIME_MST_ANNOUNCE * 60);
 357 }
 358
 359 /****************************************************************************
 360   Announce myself as a local master browser to a domain master browser.
 361   **************************************************************************/
 362
 363 void announce_myself_to_domain_master_browser(time_t t)
 364 {
 365         struct subnet_record *subrec;
 366         struct work_record *work;
 367
 368         if(!we_are_a_wins_client()) {
 369                 DEBUG(10,("announce_myself_to_domain_master_browser: no unicast subnet, ignoring.\n"));
 370                 return;
 371         }
 372
 373         if (!announce_timer_last)
 374                 announce_timer_last = t;
 375
 376         if ((t-announce_timer_last) < (CHECK_TIME_MST_ANNOUNCE * 60)) {
 377                 DEBUG(10,("announce_myself_to_domain_master_browser: t (%d) - last(%d) < %d\n",
 378                         (int)t, (int)announce_timer_last,
 379                         CHECK_TIME_MST_ANNOUNCE * 60 ));
 380                 return;
 381         }
 382
 383         announce_timer_last = t;
 384
 385         /* Look over all our broadcast subnets to see if any of them
 386                 has the state set as local master browser. */
 387
 388         for (subrec = FIRST_SUBNET; subrec; subrec = NEXT_SUBNET_EXCLUDING_UNICAST(subrec)) {
 389                 for (work = subrec->workgrouplist; work; work = work->next) {
 390                         if (AM_LOCAL_MASTER_BROWSER(work)) {
 391                                 DEBUG(4,( "announce_myself_to_domain_master_browser: I am a local master browser for \
 392 workgroup %s on subnet %s\n", work->work_group, subrec->subnet_name));
 393
 394                                 /* Look in nmbd_browsersync.c for the rest of this code. */
 395                                 announce_and_sync_with_domain_master_browser(subrec, work);
 396                         }
 397                 }
 398         }
 399 }
 400
 401 /****************************************************************************
 402 Announce all samba's server entries as 'gone'.
 403 This must *only* be called on shutdown.
 404 ****************************************************************************/
 405
 406 void announce_my_servers_removed(void)
 407 {
 408         int announce_interval = lp_lm_interval();
 409         int lm_announce = lp_lm_announce();
 410         struct subnet_record *subrec;
 411
 412         for (subrec = FIRST_SUBNET; subrec; subrec = NEXT_SUBNET_EXCLUDING_UNICAST(subrec)) {
 413                 struct work_record *work;
 414                 for (work = subrec->workgrouplist; work; work = work->next) {
 415                         struct server_record *servrec;
 416
 417                         work->announce_interval = 0;
 418                         for (servrec = work->serverlist; servrec; servrec = servrec->next) {
 419                                 if (!is_myname(servrec->serv.name))
 420                                         continue;
 421                                 servrec->serv.type = 0;
 422                                 if(AM_LOCAL_MASTER_BROWSER(work))
 423                                         send_local_master_announcement(subrec, work, servrec);
 424                                 send_host_announcement(subrec, work, servrec);
 425
 426                                 if ((announce_interval <= 0) || (lm_announce <= 0)) {
 427                                         /* user absolutely does not want LM announcements to be sent. */
 428                                         continue;
 429                                 }
 430
 431                                 if ((lm_announce >= 2) && (!found_lm_clients)) {
 432                                         /* has been set to 2 (Auto) but no LM clients detected (yet). */
 433                                         continue;
 434                                 }
 435
 436                                 /*
 437                                  * lm announce was set or we have seen lm announcements, so do
 438                                  * a lm announcement of host removed.
 439                                  */
 440
 441                                 send_lm_host_announcement(subrec, work, servrec, 0);
 442                         }
 443                 }
 444         }
 445 }
 446
 447 /****************************************************************************
 448   Do all the "remote" announcements. These are used to put ourselves
 449   on a remote browse list. They are done blind, no checking is done to
 450   see if there is actually a local master browser at the other end.
 451   **************************************************************************/
 452
 453 void announce_remote(time_t t)
 454 {
 455         char *s;
 456         const char *ptr;
 457         static time_t last_time = 0;
 458         pstring s2;
 459         struct in_addr addr;
 460         char *comment;
 461         int stype = lp_default_server_announce();
 462
 463         if (last_time && (t < (last_time + REMOTE_ANNOUNCE_INTERVAL)))
 464                 return;
 465
 466         last_time = t;
 467
 468         s = lp_remote_announce();
 469         if (!*s)
 470                 return;
 471
 472         comment = string_truncate(lp_serverstring(), MAX_SERVER_STRING_LENGTH);
 473
 474         for (ptr=s; next_token(&ptr,s2,NULL,sizeof(s2)); ) {
 475                 /* The entries are of the form a.b.c.d/WORKGROUP with
 476                                 WORKGROUP being optional */
 477                 const char *wgroup;
 478                 char *pwgroup;
 479                 int i;
 480
 481                 pwgroup = strchr_m(s2,'/');
 482                 if (pwgroup)
 483                         *pwgroup++ = 0;
 484                 if (!pwgroup || !*pwgroup)
 485                         wgroup = lp_workgroup();
 486                 else
 487                         wgroup = pwgroup;
 488
 489                 addr = *interpret_addr2(s2);
 490
 491                 /* Announce all our names including aliases */
 492                 /* Give the ip address as the address of our first
 493                                 broadcast subnet. */
 494
 495                 for(i=0; my_netbios_names(i); i++) {
 496                         const char *name = my_netbios_names(i);
 497
 498                         DEBUG(5,("announce_remote: Doing remote announce for server %s to IP %s.\n",
 499                                 name, inet_ntoa(addr) ));
 500
 501                         send_announcement(FIRST_SUBNET, ANN_HostAnnouncement,
 502                                                 name,                      /* From nbt name. */
 503                                                 wgroup, 0x1d,              /* To nbt name. */
 504                                                 addr,                      /* To ip. */
 505                                                 REMOTE_ANNOUNCE_INTERVAL,  /* Time until next announce. */
 506                                                 name,                      /* Name to announce. */
 507                                                 stype,                     /* Type field. */
 508                                                 comment);
 509                 }
 510         }
 511 }
 512
 513 /****************************************************************************
 514   Implement the 'remote browse sync' feature Andrew added.
 515   These are used to put our browse lists into remote browse lists.
 516 **************************************************************************/
 517
 518 void browse_sync_remote(time_t t)
 519 {
 520         char *s;
 521         const char *ptr;
 522         static time_t last_time = 0;
 523         pstring s2;
 524         struct in_addr addr;
 525         struct work_record *work;
 526         pstring outbuf;
 527         char *p;
 528         unstring myname;
 529
 530         if (last_time && (t < (last_time + REMOTE_ANNOUNCE_INTERVAL)))
 531                 return;
 532
 533         last_time = t;
 534
 535         s = lp_remote_browse_sync();
 536         if (!*s)
 537                 return;
 538
 539         /*
 540          * We only do this if we are the local master browser
 541          * for our workgroup on the firsst subnet.
 542          */
 543
 544         if((work = find_workgroup_on_subnet(FIRST_SUBNET, lp_workgroup())) == NULL) {
 545                 DEBUG(0,("browse_sync_remote: Cannot find workgroup %s on subnet %s\n",
 546                         lp_workgroup(), FIRST_SUBNET->subnet_name ));
 547                 return;
 548         }
 549
 550         if(!AM_LOCAL_MASTER_BROWSER(work)) {
 551                 DEBUG(5,("browse_sync_remote: We can only do this if we are a local master browser \
 552 for workgroup %s on subnet %s.\n", lp_workgroup(), FIRST_SUBNET->subnet_name ));
 553                 return;
 554         }
 555
 556         memset(outbuf,'\0',sizeof(outbuf));
 557         p = outbuf;
 558         SCVAL(p,0,ANN_MasterAnnouncement);
 559         p++;
 560
 561         unstrcpy(myname, global_myname());
 562         strupper_m(myname);
 563         myname[15]='\0';
 564         push_pstring_base(p, myname, outbuf);
 565
 566         p = skip_string(p,1);
 567
 568         for (ptr=s; next_token(&ptr,s2,NULL,sizeof(s2)); ) {
 569                 /* The entries are of the form a.b.c.d */
 570                 addr = *interpret_addr2(s2);
 571
 572                 DEBUG(5,("announce_remote: Doing remote browse sync announce for server %s to IP %s.\n",
 573                         global_myname(), inet_ntoa(addr) ));
 574
 575                 send_mailslot(True, BROWSE_MAILSLOT, outbuf,PTR_DIFF(p,outbuf),
 576                         global_myname(), 0x0, "*", 0x0, addr, FIRST_SUBNET->myip, DGRAM_PORT);
 577         }
 578 }