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 29extern int updatecount; 30extern BOOL found_lm_clients; 31 32/**************************************************************************** 33 Send a browser reset packet. 34**************************************************************************/ 35 36void 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 61void 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 \ 69to 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 89static 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 127static 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 156static 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 179static 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 198static 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 221static 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 244static 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 263void 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 305void 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. */ 347static 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 354void 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 363void 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 \ 392workgroup %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/**************************************************************************** 402Announce all samba's server entries as 'gone'. 403This must *only* be called on shutdown. 404****************************************************************************/ 405 406void 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 453void 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 518void 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 fstring 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 \ 552for 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 fstrcpy(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} 579