source3/nmbd/nmbd_namelistdb.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 1994-2003
   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 2 of the License, or
  11    (at your option) any later version.
  12
  13    This program is distributed in the hope that it will be useful,
  14    but WITHOUT ANY WARRANTY; without even the implied warranty of
  15    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  16    GNU General Public License for more details.
  17
  18    You should have received a copy of the GNU General Public License
  19    along with this program; if not, write to the Free Software
  20    Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
  21
  22 */
  23
  24 #include "includes.h"
  25
  26 uint16 samba_nb_type = 0; /* samba's NetBIOS name type */
  27
  28
  29 /**************************************************************************
  30  Set Samba's NetBIOS name type.
  31 ***************************************************************************/
  32
  33 void set_samba_nb_type(void)
  34 {
  35         if( lp_wins_support() || wins_srv_count() )
  36                 samba_nb_type = NB_HFLAG;               /* samba is a 'hybrid' node type. */
  37         else
  38                 samba_nb_type = NB_BFLAG;           /* samba is broadcast-only node type. */
  39 }
  40
  41 /***************************************************************************
  42  Convert a NetBIOS name to upper case.
  43 ***************************************************************************/
  44
  45 static void upcase_name( struct nmb_name *target, struct nmb_name *source )
  46 {
  47         int i;
  48         fstring targ;
  49         fstring scope;
  50
  51         if( NULL != source )
  52                 memcpy( target, source, sizeof( struct nmb_name ) );
  53
  54         pull_ascii_nstring(targ, sizeof(targ), target->name);
  55         strupper_m( targ );
  56         push_ascii_nstring( target->name, targ);
  57
  58         pull_ascii(scope, target->scope, 64, -1, STR_TERMINATE);
  59         strupper_m( scope );
  60         push_ascii(target->scope, scope, 64, STR_TERMINATE);
  61
  62         /* fudge... We're using a byte-by-byte compare, so we must be sure that
  63          * unused space doesn't have garbage in it.
  64          */
  65
  66         for( i = strlen( target->name ); i < sizeof( target->name ); i++ )
  67                 target->name[i] = '\0';
  68         for( i = strlen( target->scope ); i < sizeof( target->scope ); i++ )
  69                 target->scope[i] = '\0';
  70 }
  71
  72 /**************************************************************************
  73   Add a new or overwrite an existing namelist entry.
  74 ***************************************************************************/
  75
  76 static void update_name_in_namelist( struct subnet_record *subrec,
  77                               struct name_record   *namerec )
  78 {
  79         struct name_record *oldrec = NULL;
  80
  81         ubi_trInsert( subrec->namelist, namerec, &(namerec->name), &oldrec );
  82         if( oldrec ) {
  83                 SAFE_FREE( oldrec->data.ip );
  84                 SAFE_FREE( oldrec );
  85         }
  86 }
  87
  88 /**************************************************************************
  89  Remove a name from the namelist.
  90 ***************************************************************************/
  91
  92 void remove_name_from_namelist( struct subnet_record *subrec,
  93                                 struct name_record   *namerec )
  94 {
  95         ubi_trRemove( subrec->namelist, namerec );
  96         SAFE_FREE(namerec->data.ip);
  97         ZERO_STRUCTP(namerec);
  98         SAFE_FREE(namerec);
  99         subrec->namelist_changed = True;
 100 }
 101
 102 /**************************************************************************
 103  Find a name in a subnet.
 104 **************************************************************************/
 105
 106 struct name_record *find_name_on_subnet( struct subnet_record *subrec,
 107                                          struct nmb_name      *nmbname,
 108                                          BOOL                  self_only )
 109 {
 110         struct nmb_name     uc_name[1];
 111         struct name_record *name_ret;
 112
 113         upcase_name( uc_name, nmbname );
 114         name_ret = (struct name_record *)ubi_trFind( subrec->namelist, uc_name );
 115         if( name_ret ) {
 116                 /* Self names only - these include permanent names. */
 117                 if( self_only && (name_ret->data.source != SELF_NAME) && (name_ret->data.source != PERMANENT_NAME) ) {
 118                         DEBUG( 9, ( "find_name_on_subnet: on subnet %s - self name %s NOT FOUND\n",
 119                                                 subrec->subnet_name, nmb_namestr(nmbname) ) );
 120                         return( NULL );
 121                 }
 122
 123                 DEBUG( 9, ("find_name_on_subnet: on subnet %s - found name %s source=%d\n",
 124                         subrec->subnet_name, nmb_namestr(nmbname), name_ret->data.source) );
 125                 return( name_ret );
 126         }
 127
 128         DEBUG( 9, ( "find_name_on_subnet: on subnet %s - name %s NOT FOUND\n",
 129                 subrec->subnet_name, nmb_namestr(nmbname) ) );
 130         return( NULL );
 131 }
 132
 133 /**************************************************************************
 134  Find a name over all known broadcast subnets.
 135 ************************************************************************/
 136
 137 struct name_record *find_name_for_remote_broadcast_subnet(
 138                                                    struct nmb_name *nmbname,
 139                                                    BOOL             self_only )
 140 {
 141         struct subnet_record *subrec;
 142         struct name_record   *namerec = NULL;
 143
 144         for( subrec = FIRST_SUBNET; subrec; subrec = NEXT_SUBNET_EXCLUDING_UNICAST(subrec) ) {
 145                 if( NULL != (namerec = find_name_on_subnet(subrec, nmbname, self_only)) )
 146                         break;
 147         }
 148
 149         return( namerec );
 150 }
 151
 152 /**************************************************************************
 153  Update the ttl of an entry in a subnet name list.
 154 ***************************************************************************/
 155
 156 void update_name_ttl( struct name_record *namerec, int ttl )
 157 {
 158         time_t time_now = time(NULL);
 159
 160         if( namerec->data.death_time != PERMANENT_TTL )
 161                 namerec->data.death_time = time_now + ttl;
 162
 163         namerec->data.refresh_time = time_now + MIN((ttl/2), MAX_REFRESH_TIME);
 164
 165         namerec->subnet->namelist_changed = True;
 166 }
 167
 168 /**************************************************************************
 169  Add an entry to a subnet name list.
 170 ***********************************************************************/
 171
 172 struct name_record *add_name_to_subnet( struct subnet_record *subrec,
 173                                         const char           *name,
 174                                         int                   type,
 175                                         uint16                nb_flags,
 176                                         int                   ttl,
 177                                         enum name_source      source,
 178                                         int                   num_ips,
 179                                         struct in_addr       *iplist)
 180 {
 181         struct name_record *namerec;
 182         time_t time_now = time(NULL);
 183
 184         namerec = (struct name_record *)malloc( sizeof(*namerec) );
 185         if( NULL == namerec ) {
 186                 DEBUG( 0, ( "add_name_to_subnet: malloc fail.\n" ) );
 187                 return( NULL );
 188         }
 189
 190         memset( (char *)namerec, '\0', sizeof(*namerec) );
 191         namerec->data.ip = (struct in_addr *)malloc( sizeof(struct in_addr) * num_ips );
 192         if( NULL == namerec->data.ip ) {
 193                 DEBUG( 0, ( "add_name_to_subnet: malloc fail when creating ip_flgs.\n" ) );
 194                 ZERO_STRUCTP(namerec);
 195                 SAFE_FREE(namerec);
 196                 return NULL;
 197         }
 198
 199         namerec->subnet = subrec;
 200
 201         make_nmb_name(&namerec->name, name, type);
 202         upcase_name(&namerec->name, NULL );
 203
 204         /* Enter the name as active. */
 205         namerec->data.nb_flags = nb_flags | NB_ACTIVE;
 206         namerec->data.wins_flags = WINS_ACTIVE;
 207
 208         /* If it's our primary name, flag it as so. */
 209         if( strequal( my_netbios_names(0), name ) )
 210                 namerec->data.nb_flags |= NB_PERM;
 211
 212         /* Copy the IPs. */
 213         namerec->data.num_ips = num_ips;
 214         memcpy( (namerec->data.ip), iplist, num_ips * sizeof(struct in_addr) );
 215
 216         /* Data source. */
 217         namerec->data.source = source;
 218
 219         /* Setup the death_time and refresh_time. */
 220         if( ttl == PERMANENT_TTL )
 221                 namerec->data.death_time = PERMANENT_TTL;
 222         else
 223                 namerec->data.death_time = time_now + ttl;
 224
 225         namerec->data.refresh_time = time_now + MIN((ttl/2), MAX_REFRESH_TIME);
 226
 227         /* Now add the record to the name list. */
 228         update_name_in_namelist( subrec, namerec );
 229
 230         DEBUG( 3, ( "add_name_to_subnet: Added netbios name %s with first IP %s \
 231 ttl=%d nb_flags=%2x to subnet %s\n",
 232                 nmb_namestr( &namerec->name ),
 233                 inet_ntoa( *iplist ),
 234                 ttl,
 235                 (unsigned int)nb_flags,
 236                 subrec->subnet_name ) );
 237
 238         subrec->namelist_changed = True;
 239
 240         return(namerec);
 241 }
 242
 243 /*******************************************************************
 244  Utility function automatically called when a name refresh or register
 245  succeeds. By definition this is a SELF_NAME (or we wouldn't be registering
 246  it).
 247  ******************************************************************/
 248
 249 void standard_success_register(struct subnet_record *subrec,
 250                              struct userdata_struct *userdata,
 251                              struct nmb_name *nmbname, uint16 nb_flags, int ttl,
 252                              struct in_addr registered_ip)
 253 {
 254         struct name_record *namerec;
 255
 256         namerec = find_name_on_subnet( subrec, nmbname, FIND_SELF_NAME );
 257         if( NULL == namerec ) {
 258                 fstring name;
 259                 pull_ascii_nstring(name, sizeof(name), nmbname->name);
 260                 add_name_to_subnet( subrec, name, nmbname->name_type,
 261                         nb_flags, ttl, SELF_NAME, 1, &registered_ip );
 262         } else {
 263                 update_name_ttl( namerec, ttl );
 264         }
 265 }
 266
 267 /*******************************************************************
 268  Utility function automatically called when a name refresh or register
 269  fails. Note that this is only ever called on a broadcast subnet with
 270  one IP address per name. This is why it can just delete the name
 271  without enumerating the IP adresses. JRA.
 272  ******************************************************************/
 273
 274 void standard_fail_register( struct subnet_record   *subrec,
 275                              struct response_record *rrec,
 276                              struct nmb_name        *nmbname )
 277 {
 278         struct name_record *namerec;
 279
 280         namerec = find_name_on_subnet( subrec, nmbname, FIND_SELF_NAME );
 281
 282         DEBUG( 0, ( "standard_fail_register: Failed to register/refresh name %s \
 283 on subnet %s\n", nmb_namestr(nmbname), subrec->subnet_name) );
 284
 285         /* Remove the name from the subnet. */
 286         if( namerec )
 287                 remove_name_from_namelist(subrec, namerec);
 288 }
 289
 290 /*******************************************************************
 291  Utility function to remove an IP address from a name record.
 292  ******************************************************************/
 293
 294 static void remove_nth_ip_in_record( struct name_record *namerec, int ind)
 295 {
 296         if( ind != namerec->data.num_ips )
 297                 memmove( (char *)(&namerec->data.ip[ind]),
 298                                 (char *)(&namerec->data.ip[ind+1]),
 299                                 ( namerec->data.num_ips - ind - 1) * sizeof(struct in_addr) );
 300
 301         namerec->data.num_ips--;
 302         namerec->subnet->namelist_changed = True;
 303 }
 304
 305 /*******************************************************************
 306  Utility function to check if an IP address exists in a name record.
 307  ******************************************************************/
 308
 309 BOOL find_ip_in_name_record( struct name_record *namerec, struct in_addr ip )
 310 {
 311         int i;
 312
 313         for(i = 0; i < namerec->data.num_ips; i++)
 314                 if(ip_equal( namerec->data.ip[i], ip))
 315                         return True;
 316
 317         return False;
 318 }
 319
 320 /*******************************************************************
 321  Utility function to add an IP address to a name record.
 322  ******************************************************************/
 323
 324 void add_ip_to_name_record( struct name_record *namerec, struct in_addr new_ip )
 325 {
 326         struct in_addr *new_list;
 327
 328         /* Don't add one we already have. */
 329         if( find_ip_in_name_record( namerec, new_ip ) )
 330                 return;
 331
 332         new_list = (struct in_addr *)malloc( (namerec->data.num_ips + 1) * sizeof(struct in_addr) );
 333         if( NULL == new_list ) {
 334                 DEBUG(0,("add_ip_to_name_record: Malloc fail !\n"));
 335                 return;
 336         }
 337
 338         memcpy( (char *)new_list, (char *)namerec->data.ip, namerec->data.num_ips * sizeof(struct in_addr) );
 339         new_list[namerec->data.num_ips] = new_ip;
 340
 341         SAFE_FREE(namerec->data.ip);
 342         namerec->data.ip = new_list;
 343         namerec->data.num_ips += 1;
 344
 345         namerec->subnet->namelist_changed = True;
 346 }
 347
 348 /*******************************************************************
 349  Utility function to remove an IP address from a name record.
 350  ******************************************************************/
 351
 352 void remove_ip_from_name_record( struct name_record *namerec,
 353                                  struct in_addr      remove_ip )
 354 {
 355         /* Try and find the requested ip address - remove it. */
 356         int i;
 357         int orig_num = namerec->data.num_ips;
 358
 359         for(i = 0; i < orig_num; i++) {
 360                 if( ip_equal( remove_ip, namerec->data.ip[i]) ) {
 361                         remove_nth_ip_in_record( namerec, i);
 362                         break;
 363                 }
 364         }
 365 }
 366
 367 /*******************************************************************
 368  Utility function that release_name callers can plug into as the
 369  success function when a name release is successful. Used to save
 370  duplication of success_function code.
 371  ******************************************************************/
 372
 373 void standard_success_release( struct subnet_record   *subrec,
 374                                struct userdata_struct *userdata,
 375                                struct nmb_name        *nmbname,
 376                                struct in_addr          released_ip )
 377 {
 378         struct name_record *namerec;
 379
 380         namerec = find_name_on_subnet( subrec, nmbname, FIND_ANY_NAME );
 381         if( namerec == NULL ) {
 382                 DEBUG( 0, ( "standard_success_release: Name release for name %s IP %s \
 383 on subnet %s. Name was not found on subnet.\n", nmb_namestr(nmbname), inet_ntoa(released_ip),
 384                                 subrec->subnet_name) );
 385                 return;
 386         } else {
 387                 int orig_num = namerec->data.num_ips;
 388
 389                 remove_ip_from_name_record( namerec, released_ip );
 390
 391                 if( namerec->data.num_ips == orig_num )
 392                         DEBUG( 0, ( "standard_success_release: Name release for name %s IP %s \
 393 on subnet %s. This ip is not known for this name.\n", nmb_namestr(nmbname), inet_ntoa(released_ip), subrec->subnet_name ) );
 394         }
 395
 396         if( namerec->data.num_ips == 0 )
 397                 remove_name_from_namelist( subrec, namerec );
 398 }
 399
 400 /*******************************************************************
 401   Expires old names in a subnet namelist.
 402 ******************************************************************/
 403
 404 void expire_names_on_subnet(struct subnet_record *subrec, time_t t)
 405 {
 406         struct name_record *namerec;
 407         struct name_record *next_namerec;
 408
 409         for( namerec = (struct name_record *)ubi_trFirst( subrec->namelist ); namerec; namerec = next_namerec ) {
 410                 next_namerec = (struct name_record *)ubi_trNext( namerec );
 411                 if( (namerec->data.death_time != PERMANENT_TTL) && (namerec->data.death_time < t) ) {
 412                         if( namerec->data.source == SELF_NAME ) {
 413                                 DEBUG( 3, ( "expire_names_on_subnet: Subnet %s not expiring SELF \
 414 name %s\n", subrec->subnet_name, nmb_namestr(&namerec->name) ) );
 415                                 namerec->data.death_time += 300;
 416                                 namerec->subnet->namelist_changed = True;
 417                                 continue;
 418                         }
 419
 420                         DEBUG(3,("expire_names_on_subnet: Subnet %s - removing expired name %s\n",
 421                                 subrec->subnet_name, nmb_namestr(&namerec->name)));
 422
 423                         remove_name_from_namelist( subrec, namerec );
 424                 }
 425         }
 426 }
 427
 428 /*******************************************************************
 429   Expires old names in all subnet namelists.
 430 ******************************************************************/
 431
 432 void expire_names(time_t t)
 433 {
 434         struct subnet_record *subrec;
 435
 436         for( subrec = FIRST_SUBNET; subrec; subrec = NEXT_SUBNET_INCLUDING_UNICAST(subrec) ) {
 437                 expire_names_on_subnet( subrec, t );
 438         }
 439 }
 440
 441 /****************************************************************************
 442   Add the magic samba names, useful for finding samba servers.
 443   These go directly into the name list for a particular subnet,
 444   without going through the normal registration process.
 445   When adding them to the unicast subnet, add them as a list of
 446   all broadcast subnet IP addresses.
 447 **************************************************************************/
 448
 449 void add_samba_names_to_subnet( struct subnet_record *subrec )
 450 {
 451         struct in_addr *iplist = &subrec->myip;
 452         int num_ips = 1;
 453
 454         /* These names are added permanently (ttl of zero) and will NOT be refreshed.  */
 455
 456         if( (subrec == unicast_subnet) || (subrec == wins_server_subnet) || (subrec == remote_broadcast_subnet) ) {
 457                 struct subnet_record *bcast_subrecs;
 458                 int i;
 459
 460                 /* Create an IP list containing all our known subnets. */
 461
 462                 num_ips = iface_count();
 463                 iplist = (struct in_addr *)malloc( num_ips * sizeof(struct in_addr) );
 464                 if( NULL == iplist ) {
 465                         DEBUG(0,("add_samba_names_to_subnet: Malloc fail !\n"));
 466                         return;
 467                 }
 468
 469                 for( bcast_subrecs = FIRST_SUBNET, i = 0; bcast_subrecs; bcast_subrecs = NEXT_SUBNET_EXCLUDING_UNICAST(bcast_subrecs), i++ )
 470                         iplist[i] = bcast_subrecs->myip;
 471         }
 472
 473         add_name_to_subnet(subrec,"*",0x0,samba_nb_type, PERMANENT_TTL,
 474                                 PERMANENT_NAME, num_ips, iplist);
 475         add_name_to_subnet(subrec,"*",0x20,samba_nb_type,PERMANENT_TTL,
 476                                 PERMANENT_NAME, num_ips, iplist);
 477         add_name_to_subnet(subrec,"__SAMBA__",0x20,samba_nb_type,PERMANENT_TTL,
 478                                 PERMANENT_NAME, num_ips, iplist);
 479         add_name_to_subnet(subrec,"__SAMBA__",0x00,samba_nb_type,PERMANENT_TTL,
 480                                 PERMANENT_NAME, num_ips, iplist);
 481
 482         if(iplist != &subrec->myip)
 483                 SAFE_FREE(iplist);
 484 }
 485
 486 /****************************************************************************
 487  Dump the contents of the namelists on all the subnets (including unicast)
 488  into a file. Initiated by SIGHUP - used to debug the state of the namelists.
 489 **************************************************************************/
 490
 491 static void dump_subnet_namelist( struct subnet_record *subrec, XFILE *fp)
 492 {
 493         struct name_record *namerec;
 494         const char *src_type;
 495         struct tm *tm;
 496         int i;
 497
 498         x_fprintf(fp, "Subnet %s\n----------------------\n", subrec->subnet_name);
 499         for( namerec = (struct name_record *)ubi_trFirst( subrec->namelist ); namerec;
 500                                 namerec = (struct name_record *)ubi_trNext( namerec ) ) {
 501
 502                 x_fprintf(fp,"\tName = %s\t", nmb_namestr(&namerec->name));
 503                 switch(namerec->data.source) {
 504                         case LMHOSTS_NAME:
 505                                 src_type = "LMHOSTS_NAME";
 506                                 break;
 507                         case WINS_PROXY_NAME:
 508                                 src_type = "WINS_PROXY_NAME";
 509                                 break;
 510                         case REGISTER_NAME:
 511                                 src_type = "REGISTER_NAME";
 512                                 break;
 513                         case SELF_NAME:
 514                                 src_type = "SELF_NAME";
 515                                 break;
 516                         case DNS_NAME:
 517                                 src_type = "DNS_NAME";
 518                                 break;
 519                         case DNSFAIL_NAME:
 520                                 src_type = "DNSFAIL_NAME";
 521                                 break;
 522                         case PERMANENT_NAME:
 523                                 src_type = "PERMANENT_NAME";
 524                                 break;
 525                         default:
 526                                 src_type = "unknown!";
 527                                 break;
 528                 }
 529
 530                 x_fprintf(fp,"Source = %s\nb_flags = %x\t", src_type, namerec->data.nb_flags);
 531
 532                 if(namerec->data.death_time != PERMANENT_TTL) {
 533                         tm = LocalTime(&namerec->data.death_time);
 534                         x_fprintf(fp, "death_time = %s\t", asctime(tm));
 535                 } else {
 536                         x_fprintf(fp, "death_time = PERMANENT\t");
 537                 }
 538
 539                 if(namerec->data.refresh_time != PERMANENT_TTL) {
 540                         tm = LocalTime(&namerec->data.refresh_time);
 541                         x_fprintf(fp, "refresh_time = %s\n", asctime(tm));
 542                 } else {
 543                         x_fprintf(fp, "refresh_time = PERMANENT\n");
 544                 }
 545
 546                 x_fprintf(fp, "\t\tnumber of IPS = %d", namerec->data.num_ips);
 547                 for(i = 0; i < namerec->data.num_ips; i++)
 548                         x_fprintf(fp, "\t%s", inet_ntoa(namerec->data.ip[i]));
 549
 550                 x_fprintf(fp, "\n\n");
 551         }
 552 }
 553
 554 /****************************************************************************
 555  Dump the contents of the namelists on all the subnets (including unicast)
 556  into a file. Initiated by SIGHUP - used to debug the state of the namelists.
 557 **************************************************************************/
 558
 559 void dump_all_namelists(void)
 560 {
 561         XFILE *fp;
 562         struct subnet_record *subrec;
 563
 564         fp = x_fopen(lock_path("namelist.debug"),O_WRONLY|O_CREAT|O_TRUNC, 0644);
 565
 566         if (!fp) {
 567                 DEBUG(0,("dump_all_namelists: Can't open file %s. Error was %s\n",
 568                         "namelist.debug",strerror(errno)));
 569                 return;
 570         }
 571
 572         for( subrec = FIRST_SUBNET; subrec; subrec = NEXT_SUBNET_INCLUDING_UNICAST(subrec) )
 573                 dump_subnet_namelist( subrec, fp );
 574
 575         if( !we_are_a_wins_client() )
 576                 dump_subnet_namelist( unicast_subnet, fp );
 577
 578         if( remote_broadcast_subnet->namelist != NULL )
 579                 dump_subnet_namelist( remote_broadcast_subnet, fp );
 580
 581         if( wins_server_subnet != NULL )
 582                 dump_subnet_namelist( wins_server_subnet, fp );
 583         x_fclose( fp );
 584 }