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 1994-2003 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 25uint16 samba_nb_type = 0; /* samba's NetBIOS name type */ 26 27 28/************************************************************************** 29 Set Samba's NetBIOS name type. 30***************************************************************************/ 31 32void set_samba_nb_type(void) 33{ 34 if( lp_wins_support() || wins_srv_count() ) { 35 samba_nb_type = NB_HFLAG; /* samba is a 'hybrid' node type. */ 36 } else { 37 samba_nb_type = NB_BFLAG; /* samba is broadcast-only node type. */ 38 } 39} 40 41/*************************************************************************** 42 Convert a NetBIOS name to upper case. 43***************************************************************************/ 44 45static void upcase_name( struct nmb_name *target, const struct nmb_name *source ) 46{ 47 int i; 48 unstring targ; 49 fstring scope; 50 51 if( NULL != source ) { 52 memcpy( target, source, sizeof( struct nmb_name ) ); 53 } 54 55 pull_ascii_nstring(targ, sizeof(targ), target->name); 56 strupper_m( targ ); 57 push_ascii_nstring( target->name, targ); 58 59 pull_ascii(scope, target->scope, 64, -1, STR_TERMINATE); 60 strupper_m( scope ); 61 push_ascii(target->scope, scope, 64, STR_TERMINATE); 62 63 /* fudge... We're using a byte-by-byte compare, so we must be sure that 64 * unused space doesn't have garbage in it. 65 */ 66 67 for( i = strlen( target->name ); i < sizeof( target->name ); i++ ) { 68 target->name[i] = '\0'; 69 } 70 for( i = strlen( target->scope ); i < sizeof( target->scope ); i++ ) { 71 target->scope[i] = '\0'; 72 } 73} 74 75/************************************************************************** 76 Remove a name from the namelist. 77***************************************************************************/ 78 79void remove_name_from_namelist(struct subnet_record *subrec, 80 struct name_record *namerec ) 81{ 82 if (subrec == wins_server_subnet) 83 remove_name_from_wins_namelist(namerec); 84 else { 85 subrec->namelist_changed = True; 86 DLIST_REMOVE(subrec->namelist, namerec); 87 } 88 89 SAFE_FREE(namerec->data.ip); 90 ZERO_STRUCTP(namerec); 91 SAFE_FREE(namerec); 92} 93 94/************************************************************************** 95 Find a name in a subnet. 96**************************************************************************/ 97 98struct name_record *find_name_on_subnet(struct subnet_record *subrec, 99 const struct nmb_name *nmbname, 100 bool self_only) 101{ 102 struct nmb_name uc_name; 103 struct name_record *name_ret; 104 105 upcase_name( &uc_name, nmbname ); 106 107 if (subrec == wins_server_subnet) { 108 return find_name_on_wins_subnet(&uc_name, self_only); 109 } 110 111 for( name_ret = subrec->namelist; name_ret; name_ret = name_ret->next) { 112 if (memcmp(&uc_name, &name_ret->name, sizeof(struct nmb_name)) == 0) { 113 break; 114 } 115 } 116 117 if( name_ret ) { 118 /* Self names only - these include permanent names. */ 119 if( self_only && (name_ret->data.source != SELF_NAME) && (name_ret->data.source != PERMANENT_NAME) ) { 120 DEBUG( 9, ( "find_name_on_subnet: on subnet %s - self name %s NOT FOUND\n", 121 subrec->subnet_name, nmb_namestr(nmbname) ) ); 122 return NULL; 123 } 124 125 DEBUG( 9, ("find_name_on_subnet: on subnet %s - found name %s source=%d\n", 126 subrec->subnet_name, nmb_namestr(nmbname), name_ret->data.source) ); 127 128 return name_ret; 129 } 130 131 DEBUG( 9, ( "find_name_on_subnet: on subnet %s - name %s NOT FOUND\n", 132 subrec->subnet_name, nmb_namestr(nmbname) ) ); 133 134 return NULL; 135} 136 137/************************************************************************** 138 Find a name over all known broadcast subnets. 139************************************************************************/ 140 141struct name_record *find_name_for_remote_broadcast_subnet(struct nmb_name *nmbname, 142 bool self_only) 143{ 144 struct subnet_record *subrec; 145 struct name_record *namerec; 146 147 for( subrec = FIRST_SUBNET; subrec; subrec = NEXT_SUBNET_EXCLUDING_UNICAST(subrec) ) { 148 namerec = find_name_on_subnet(subrec, nmbname, self_only); 149 if (namerec) { 150 return namerec; 151 } 152 } 153 154 return NULL; 155} 156 157/************************************************************************** 158 Update the ttl of an entry in a subnet name list. 159***************************************************************************/ 160 161void update_name_ttl( struct name_record *namerec, int ttl ) 162{ 163 time_t time_now = time(NULL); 164 165 if( namerec->data.death_time != PERMANENT_TTL) { 166 namerec->data.death_time = time_now + ttl; 167 } 168 169 namerec->data.refresh_time = time_now + MIN((ttl/2), MAX_REFRESH_TIME); 170 171 if (namerec->subnet == wins_server_subnet) { 172 wins_store_changed_namerec(namerec); 173 } else { 174 namerec->subnet->namelist_changed = True; 175 } 176} 177 178/************************************************************************** 179 Add an entry to a subnet name list. 180***********************************************************************/ 181 182bool add_name_to_subnet( struct subnet_record *subrec, 183 const char *name, 184 int type, 185 uint16 nb_flags, 186 int ttl, 187 enum name_source source, 188 int num_ips, 189 struct in_addr *iplist) 190{ 191 bool ret = False; 192 struct name_record *namerec; 193 time_t time_now = time(NULL); 194 195 if (num_ips == 0) { 196 return false; 197 } 198 199 namerec = SMB_MALLOC_P(struct name_record); 200 if( NULL == namerec ) { 201 DEBUG( 0, ( "add_name_to_subnet: malloc fail.\n" ) ); 202 return False; 203 } 204 205 memset( (char *)namerec, '\0', sizeof(*namerec) ); 206 namerec->data.ip = SMB_MALLOC_ARRAY( struct in_addr, num_ips ); 207 if( NULL == namerec->data.ip ) { 208 DEBUG( 0, ( "add_name_to_subnet: malloc fail when creating ip_flgs.\n" ) ); 209 ZERO_STRUCTP(namerec); 210 SAFE_FREE(namerec); 211 return False; 212 } 213 214 namerec->subnet = subrec; 215 216 make_nmb_name(&namerec->name, name, type); 217 upcase_name(&namerec->name, NULL ); 218 219 /* Enter the name as active. */ 220 namerec->data.nb_flags = nb_flags | NB_ACTIVE; 221 namerec->data.wins_flags = WINS_ACTIVE; 222 223 /* If it's our primary name, flag it as so. */ 224 if (strequal( my_netbios_names(0), name )) { 225 namerec->data.nb_flags |= NB_PERM; 226 } 227 228 /* Copy the IPs. */ 229 namerec->data.num_ips = num_ips; 230 memcpy( (namerec->data.ip), iplist, num_ips * sizeof(struct in_addr) ); 231 232 /* Data source. */ 233 namerec->data.source = source; 234 235 /* Setup the death_time and refresh_time. */ 236 if (ttl == PERMANENT_TTL) { 237 namerec->data.death_time = PERMANENT_TTL; 238 } else { 239 namerec->data.death_time = time_now + ttl; 240 } 241 242 namerec->data.refresh_time = time_now + MIN((ttl/2), MAX_REFRESH_TIME); 243 244 DEBUG( 3, ( "add_name_to_subnet: Added netbios name %s with first IP %s \ 245ttl=%d nb_flags=%2x to subnet %s\n", 246 nmb_namestr( &namerec->name ), 247 inet_ntoa( *iplist ), 248 ttl, 249 (unsigned int)nb_flags, 250 subrec->subnet_name ) ); 251 252 /* Now add the record to the name list. */ 253 254 if (subrec == wins_server_subnet) { 255 ret = add_name_to_wins_subnet(namerec); 256 /* Free namerec - it's stored in the tdb. */ 257 SAFE_FREE(namerec->data.ip); 258 SAFE_FREE(namerec); 259 } else { 260 DLIST_ADD(subrec->namelist, namerec); 261 subrec->namelist_changed = True; 262 ret = True; 263 } 264 265 return ret; 266} 267 268/******************************************************************* 269 Utility function automatically called when a name refresh or register 270 succeeds. By definition this is a SELF_NAME (or we wouldn't be registering 271 it). 272 ******************************************************************/ 273 274void standard_success_register(struct subnet_record *subrec, 275 struct userdata_struct *userdata, 276 struct nmb_name *nmbname, uint16 nb_flags, int ttl, 277 struct in_addr registered_ip) 278{ 279 struct name_record *namerec; 280 281 namerec = find_name_on_subnet( subrec, nmbname, FIND_SELF_NAME); 282 if (namerec == NULL) { 283 unstring name; 284 pull_ascii_nstring(name, sizeof(name), nmbname->name); 285 add_name_to_subnet( subrec, name, nmbname->name_type, 286 nb_flags, ttl, SELF_NAME, 1, ®istered_ip ); 287 } else { 288 update_name_ttl( namerec, ttl ); 289 } 290} 291 292/******************************************************************* 293 Utility function automatically called when a name refresh or register 294 fails. Note that this is only ever called on a broadcast subnet with 295 one IP address per name. This is why it can just delete the name 296 without enumerating the IP adresses. JRA. 297 ******************************************************************/ 298 299void standard_fail_register( struct subnet_record *subrec, 300 struct nmb_name *nmbname ) 301{ 302 struct name_record *namerec; 303 304 namerec = find_name_on_subnet( subrec, nmbname, FIND_SELF_NAME); 305 306 DEBUG( 0, ( "standard_fail_register: Failed to register/refresh name %s \ 307on subnet %s\n", nmb_namestr(nmbname), subrec->subnet_name) ); 308 309 /* Remove the name from the subnet. */ 310 if( namerec ) { 311 remove_name_from_namelist(subrec, namerec); 312 } 313} 314 315/******************************************************************* 316 Utility function to remove an IP address from a name record. 317 ******************************************************************/ 318 319static void remove_nth_ip_in_record( struct name_record *namerec, int ind) 320{ 321 if( ind != namerec->data.num_ips ) { 322 memmove( (char *)(&namerec->data.ip[ind]), 323 (char *)(&namerec->data.ip[ind+1]), 324 ( namerec->data.num_ips - ind - 1) * sizeof(struct in_addr) ); 325 } 326 327 namerec->data.num_ips--; 328 if (namerec->subnet == wins_server_subnet) { 329 wins_store_changed_namerec(namerec); 330 } else { 331 namerec->subnet->namelist_changed = True; 332 } 333} 334 335/******************************************************************* 336 Utility function to check if an IP address exists in a name record. 337 ******************************************************************/ 338 339bool find_ip_in_name_record( struct name_record *namerec, struct in_addr ip ) 340{ 341 int i; 342 343 for(i = 0; i < namerec->data.num_ips; i++) { 344 if(ip_equal_v4( namerec->data.ip[i], ip)) { 345 return True; 346 } 347 } 348 349 return False; 350} 351 352/******************************************************************* 353 Utility function to add an IP address to a name record. 354 ******************************************************************/ 355 356void add_ip_to_name_record( struct name_record *namerec, struct in_addr new_ip ) 357{ 358 struct in_addr *new_list; 359 360 /* Don't add one we already have. */ 361 if( find_ip_in_name_record( namerec, new_ip )) { 362 return; 363 } 364 365 new_list = SMB_MALLOC_ARRAY( struct in_addr, namerec->data.num_ips + 1); 366 if( NULL == new_list ) { 367 DEBUG(0,("add_ip_to_name_record: Malloc fail !\n")); 368 return; 369 } 370 371 memcpy( (char *)new_list, (char *)namerec->data.ip, namerec->data.num_ips * sizeof(struct in_addr) ); 372 new_list[namerec->data.num_ips] = new_ip; 373 374 SAFE_FREE(namerec->data.ip); 375 namerec->data.ip = new_list; 376 namerec->data.num_ips += 1; 377 378 if (namerec->subnet == wins_server_subnet) { 379 wins_store_changed_namerec(namerec); 380 } else { 381 namerec->subnet->namelist_changed = True; 382 } 383} 384 385/******************************************************************* 386 Utility function to remove an IP address from a name record. 387 ******************************************************************/ 388 389void remove_ip_from_name_record( struct name_record *namerec, 390 struct in_addr remove_ip ) 391{ 392 /* Try and find the requested ip address - remove it. */ 393 int i; 394 int orig_num = namerec->data.num_ips; 395 396 for(i = 0; i < orig_num; i++) { 397 if( ip_equal_v4( remove_ip, namerec->data.ip[i]) ) { 398 remove_nth_ip_in_record( namerec, i); 399 break; 400 } 401 } 402} 403 404/******************************************************************* 405 Utility function that release_name callers can plug into as the 406 success function when a name release is successful. Used to save 407 duplication of success_function code. 408 ******************************************************************/ 409 410void standard_success_release( struct subnet_record *subrec, 411 struct userdata_struct *userdata, 412 struct nmb_name *nmbname, 413 struct in_addr released_ip ) 414{ 415 struct name_record *namerec; 416 417 namerec = find_name_on_subnet( subrec, nmbname, FIND_ANY_NAME ); 418 if( namerec == NULL ) { 419 DEBUG( 0, ( "standard_success_release: Name release for name %s IP %s \ 420on subnet %s. Name was not found on subnet.\n", nmb_namestr(nmbname), inet_ntoa(released_ip), 421 subrec->subnet_name) ); 422 return; 423 } else { 424 int orig_num = namerec->data.num_ips; 425 426 remove_ip_from_name_record( namerec, released_ip ); 427 428 if( namerec->data.num_ips == orig_num ) { 429 DEBUG( 0, ( "standard_success_release: Name release for name %s IP %s \ 430on subnet %s. This ip is not known for this name.\n", nmb_namestr(nmbname), inet_ntoa(released_ip), subrec->subnet_name ) ); 431 } 432 } 433 434 if( namerec->data.num_ips == 0 ) { 435 remove_name_from_namelist( subrec, namerec ); 436 } 437} 438 439/******************************************************************* 440 Expires old names in a subnet namelist. 441 NB. Does not touch the wins_subnet - no wins specific processing here. 442******************************************************************/ 443 444static void expire_names_on_subnet(struct subnet_record *subrec, time_t t) 445{ 446 struct name_record *namerec; 447 struct name_record *next_namerec; 448 449 for( namerec = subrec->namelist; namerec; namerec = next_namerec ) { 450 next_namerec = namerec->next; 451 if( (namerec->data.death_time != PERMANENT_TTL) && (namerec->data.death_time < t) ) { 452 if( namerec->data.source == SELF_NAME ) { 453 DEBUG( 3, ( "expire_names_on_subnet: Subnet %s not expiring SELF \ 454name %s\n", subrec->subnet_name, nmb_namestr(&namerec->name) ) ); 455 namerec->data.death_time += 300; 456 namerec->subnet->namelist_changed = True; 457 continue; 458 } 459 460 DEBUG(3,("expire_names_on_subnet: Subnet %s - removing expired name %s\n", 461 subrec->subnet_name, nmb_namestr(&namerec->name))); 462 463 remove_name_from_namelist(subrec, namerec ); 464 } 465 } 466} 467 468/******************************************************************* 469 Expires old names in all subnet namelists. 470 NB. Does not touch the wins_subnet. 471******************************************************************/ 472 473void expire_names(time_t t) 474{ 475 struct subnet_record *subrec; 476 477 for( subrec = FIRST_SUBNET; subrec; subrec = NEXT_SUBNET_INCLUDING_UNICAST(subrec) ) { 478 expire_names_on_subnet( subrec, t ); 479 } 480} 481 482/**************************************************************************** 483 Add the magic samba names, useful for finding samba servers. 484 These go directly into the name list for a particular subnet, 485 without going through the normal registration process. 486 When adding them to the unicast subnet, add them as a list of 487 all broadcast subnet IP addresses. 488**************************************************************************/ 489 490void add_samba_names_to_subnet( struct subnet_record *subrec ) 491{ 492 struct in_addr *iplist = &subrec->myip; 493 int num_ips = 1; 494 495 /* These names are added permanently (ttl of zero) and will NOT be refreshed. */ 496 497 if( (subrec == unicast_subnet) || (subrec == wins_server_subnet) || (subrec == remote_broadcast_subnet) ) { 498 struct subnet_record *bcast_subrecs; 499 int i; 500 501 /* Create an IP list containing all our known subnets. */ 502 503 num_ips = iface_count(); 504 iplist = SMB_MALLOC_ARRAY( struct in_addr, num_ips); 505 if( NULL == iplist ) { 506 DEBUG(0,("add_samba_names_to_subnet: Malloc fail !\n")); 507 return; 508 } 509 510 for( bcast_subrecs = FIRST_SUBNET, i = 0; bcast_subrecs && 511 i < num_ips; 512 bcast_subrecs = NEXT_SUBNET_EXCLUDING_UNICAST(bcast_subrecs), i++ ) { 513 iplist[i] = bcast_subrecs->myip; 514 } 515 num_ips = i; 516 } 517 518 add_name_to_subnet(subrec,"*",0x0,samba_nb_type, PERMANENT_TTL, 519 PERMANENT_NAME, num_ips, iplist); 520 add_name_to_subnet(subrec,"*",0x20,samba_nb_type,PERMANENT_TTL, 521 PERMANENT_NAME, num_ips, iplist); 522 add_name_to_subnet(subrec,"__SAMBA__",0x20,samba_nb_type,PERMANENT_TTL, 523 PERMANENT_NAME, num_ips, iplist); 524 add_name_to_subnet(subrec,"__SAMBA__",0x00,samba_nb_type,PERMANENT_TTL, 525 PERMANENT_NAME, num_ips, iplist); 526 527 if(iplist != &subrec->myip) { 528 SAFE_FREE(iplist); 529 } 530} 531 532/**************************************************************************** 533 Dump a name_record struct. 534**************************************************************************/ 535 536void dump_name_record( struct name_record *namerec, XFILE *fp) 537{ 538 const char *src_type; 539 struct tm *tm; 540 int i; 541 542 x_fprintf(fp,"\tName = %s\t", nmb_namestr(&namerec->name)); 543 switch(namerec->data.source) { 544 case LMHOSTS_NAME: 545 src_type = "LMHOSTS_NAME"; 546 break; 547 case WINS_PROXY_NAME: 548 src_type = "WINS_PROXY_NAME"; 549 break; 550 case REGISTER_NAME: 551 src_type = "REGISTER_NAME"; 552 break; 553 case SELF_NAME: 554 src_type = "SELF_NAME"; 555 break; 556 case DNS_NAME: 557 src_type = "DNS_NAME"; 558 break; 559 case DNSFAIL_NAME: 560 src_type = "DNSFAIL_NAME"; 561 break; 562 case PERMANENT_NAME: 563 src_type = "PERMANENT_NAME"; 564 break; 565 default: 566 src_type = "unknown!"; 567 break; 568 } 569 570 x_fprintf(fp,"Source = %s\nb_flags = %x\t", src_type, namerec->data.nb_flags); 571 572 if(namerec->data.death_time != PERMANENT_TTL) { 573 const char *asct; 574 tm = localtime(&namerec->data.death_time); 575 if (!tm) { 576 return; 577 } 578 asct = asctime(tm); 579 if (!asct) { 580 return; 581 } 582 x_fprintf(fp, "death_time = %s\t", asct); 583 } else { 584 x_fprintf(fp, "death_time = PERMANENT\t"); 585 } 586 587 if(namerec->data.refresh_time != PERMANENT_TTL) { 588 const char *asct; 589 tm = localtime(&namerec->data.refresh_time); 590 if (!tm) { 591 return; 592 } 593 asct = asctime(tm); 594 if (!asct) { 595 return; 596 } 597 x_fprintf(fp, "refresh_time = %s\n", asct); 598 } else { 599 x_fprintf(fp, "refresh_time = PERMANENT\n"); 600 } 601 602 x_fprintf(fp, "\t\tnumber of IPS = %d", namerec->data.num_ips); 603 for(i = 0; i < namerec->data.num_ips; i++) { 604 x_fprintf(fp, "\t%s", inet_ntoa(namerec->data.ip[i])); 605 } 606 607 x_fprintf(fp, "\n\n"); 608 609} 610 611/**************************************************************************** 612 Dump the contents of the namelists on all the subnets (including unicast) 613 into a file. Initiated by SIGHUP - used to debug the state of the namelists. 614**************************************************************************/ 615 616static void dump_subnet_namelist( struct subnet_record *subrec, XFILE *fp) 617{ 618 struct name_record *namerec; 619 x_fprintf(fp, "Subnet %s\n----------------------\n", subrec->subnet_name); 620 for( namerec = subrec->namelist; namerec; namerec = namerec->next) { 621 dump_name_record(namerec, fp); 622 } 623} 624 625/**************************************************************************** 626 Dump the contents of the namelists on all the subnets (including unicast) 627 into a file. Initiated by SIGHUP - used to debug the state of the namelists. 628**************************************************************************/ 629 630void dump_all_namelists(void) 631{ 632 XFILE *fp; 633 struct subnet_record *subrec; 634 635 fp = x_fopen(lock_path("namelist.debug"),O_WRONLY|O_CREAT|O_TRUNC, 0644); 636 637 if (!fp) { 638 DEBUG(0,("dump_all_namelists: Can't open file %s. Error was %s\n", 639 "namelist.debug",strerror(errno))); 640 return; 641 } 642 643 for (subrec = FIRST_SUBNET; subrec; subrec = NEXT_SUBNET_INCLUDING_UNICAST(subrec)) { 644 dump_subnet_namelist( subrec, fp ); 645 } 646 647 if (!we_are_a_wins_client()) { 648 dump_subnet_namelist( unicast_subnet, fp ); 649 } 650 651 if (remote_broadcast_subnet->namelist != NULL) { 652 dump_subnet_namelist( remote_broadcast_subnet, fp ); 653 } 654 655 if (wins_server_subnet != NULL) { 656 dump_wins_subnet_namelist(fp ); 657 } 658 659 x_fclose( fp ); 660} 661