source/nmbd/nmbd_namelistdb.c

   1 /*
   2    Unix SMB/Netbios implementation.
   3    Version 1.9.
   4    NBT netbios routines and daemon - version 2
   5    Copyright (C) Andrew Tridgell 1994-1998
   6    Copyright (C) Luke Kenneth Casson Leighton 1994-1998
   7    Copyright (C) Jeremy Allison 1994-1998
   8
   9    This program is free software; you can redistribute it and/or modify
  10    it under the terms of the GNU General Public License as published by
  11    the Free Software Foundation; either version 2 of the License, or
  12    (at your option) any later version.
  13
  14    This program is distributed in the hope that it will be useful,
  15    but WITHOUT ANY WARRANTY; without even the implied warranty of
  16    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  17    GNU General Public License for more details.
  18
  19    You should have received a copy of the GNU General Public License
  20    along with this program; if not, write to the Free Software
  21    Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
  22
  23 */
  24
  25 #include "includes.h"
  26
  27 extern char **my_netbios_names;
  28
  29 uint16 samba_nb_type = 0; /* samba's NetBIOS name type */
  30
  31
  32 /* ************************************************************************** **
  33  * Set Samba's NetBIOS name type.
  34  * ************************************************************************** **
  35  */
  36 void set_samba_nb_type(void)
  37   {
  38   if( lp_wins_support() || (*lp_wins_server()) )
  39     samba_nb_type = NB_MFLAG;               /* samba is a 'hybrid' node type. */
  40   else
  41     samba_nb_type = NB_BFLAG;           /* samba is broadcast-only node type. */
  42   } /* set_samba_nb_type */
  43
  44 /* ************************************************************************** **
  45  * Convert a NetBIOS name to upper case.
  46  * ************************************************************************** **
  47  */
  48 static void upcase_name( struct nmb_name *target, struct nmb_name *source )
  49   {
  50   int i;
  51
  52   if( NULL != source )
  53     (void)memcpy( target, source, sizeof( struct nmb_name ) );
  54
  55   strupper( target->name );
  56   strupper( target->scope );
  57
  58   /* fudge... We're using a byte-by-byte compare, so we must be sure that
  59    * unused space doesn't have garbage in it.
  60    */
  61   for( i = strlen( target->name ); i < sizeof( target->name ); i++ )
  62     target->name[i] = '\0';
  63   for( i = strlen( target->scope ); i < sizeof( target->scope ); i++ )
  64     target->scope[i] = '\0';
  65   } /* upcase_name */
  66
  67 /* ************************************************************************** **
  68  * Add a new or overwrite an existing namelist entry.
  69  * ************************************************************************** **
  70  */
  71 static void update_name_in_namelist( struct subnet_record *subrec,
  72                               struct name_record   *namerec )
  73   {
  74   struct name_record *oldrec = NULL;
  75
  76   (void)ubi_trInsert( subrec->namelist, namerec, &(namerec->name), &oldrec );
  77   if( oldrec )
  78     {
  79     SAFE_FREE( oldrec->data.ip );
  80     SAFE_FREE( oldrec );
  81     }
  82   } /* update_name_in_namelist */
  83
  84 /* ************************************************************************** **
  85  * Remove a name from the namelist.
  86  * ************************************************************************** **
  87  */
  88 void remove_name_from_namelist( struct subnet_record *subrec,
  89                                 struct name_record   *namerec )
  90   {
  91   (void)ubi_trRemove( subrec->namelist, namerec );
  92
  93   SAFE_FREE(namerec->data.ip);
  94
  95   ZERO_STRUCTP(namerec);
  96   SAFE_FREE(namerec);
  97
  98   subrec->namelist_changed = True;
  99   } /* remove_name_from_namelist */
 100
 101 /* ************************************************************************** **
 102  * Find a name in a subnet.
 103  * ************************************************************************** **
 104  */
 105 struct name_record *find_name_on_subnet( struct subnet_record *subrec,
 106                                          struct nmb_name      *nmbname,
 107                                          BOOL                  self_only )
 108   {
 109   struct nmb_name     uc_name[1];
 110   struct name_record *name_ret;
 111
 112   upcase_name( uc_name, nmbname );
 113   name_ret = (struct name_record *)ubi_trFind( subrec->namelist, uc_name );
 114   if( name_ret )
 115     {
 116     /* Self names only - these include permanent names. */
 117     if( self_only
 118      && (name_ret->data.source != SELF_NAME)
 119      && (name_ret->data.source != PERMANENT_NAME) )
 120       {
 121       DEBUG( 9,
 122              ( "find_name_on_subnet: on subnet %s - self name %s NOT FOUND\n",
 123                subrec->subnet_name, nmb_namestr(nmbname) ) );
 124       return( NULL );
 125       }
 126     DEBUG( 9, ("find_name_on_subnet: on subnet %s - found name %s source=%d\n",
 127                subrec->subnet_name, nmb_namestr(nmbname), name_ret->data.source) );
 128     return( name_ret );
 129     }
 130   DEBUG( 9,
 131          ( "find_name_on_subnet: on subnet %s - name %s NOT FOUND\n",
 132            subrec->subnet_name, nmb_namestr(nmbname) ) );
 133   return( NULL );
 134   } /* find_name_on_subnet */
 135
 136 /* ************************************************************************** **
 137  * Find a name over all known broadcast subnets.
 138  * ************************************************************************** **
 139  */
 140 struct name_record *find_name_for_remote_broadcast_subnet(
 141                                                    struct nmb_name *nmbname,
 142                                                    BOOL             self_only )
 143   {
 144   struct subnet_record *subrec;
 145   struct name_record   *namerec = NULL;
 146
 147   for( subrec = FIRST_SUBNET;
 148        subrec;
 149        subrec = NEXT_SUBNET_EXCLUDING_UNICAST(subrec) )
 150     {
 151     if( NULL != (namerec = find_name_on_subnet(subrec, nmbname, self_only)) )
 152       break;
 153     }
 154
 155   return( namerec );
 156   } /* find_name_for_remote_broadcast_subnet */
 157
 158 /* ************************************************************************** **
 159  * Update the ttl of an entry in a subnet name list.
 160  * ************************************************************************** **
 161  */
 162 void update_name_ttl( struct name_record *namerec, int ttl )
 163 {
 164   time_t time_now = time(NULL);
 165
 166   if( namerec->data.death_time != PERMANENT_TTL )
 167     namerec->data.death_time = time_now + ttl;
 168
 169   namerec->data.refresh_time = time_now + MIN((ttl/2), MAX_REFRESH_TIME);
 170
 171   namerec->subnet->namelist_changed = True;
 172 } /* update_name_ttl */
 173
 174 /* ************************************************************************** **
 175  * Add an entry to a subnet name list.
 176  * ************************************************************************** **
 177  */
 178 struct name_record *add_name_to_subnet( struct subnet_record *subrec,
 179                                         char                 *name,
 180                                         int                   type,
 181                                         uint16                nb_flags,
 182                                         int                   ttl,
 183                                         enum name_source      source,
 184                                         int                   num_ips,
 185                                         struct in_addr       *iplist)
 186 {
 187   struct name_record *namerec;
 188   time_t time_now = time(NULL);
 189
 190   namerec = (struct name_record *)malloc( sizeof(*namerec) );
 191   if( NULL == namerec )
 192   {
 193     DEBUG( 0, ( "add_name_to_subnet: malloc fail.\n" ) );
 194     return( NULL );
 195   }
 196
 197   memset( (char *)namerec, '\0', sizeof(*namerec) );
 198   namerec->data.ip = (struct in_addr *)malloc( sizeof(struct in_addr)
 199                                                * num_ips );
 200   if( NULL == namerec->data.ip )
 201   {
 202      DEBUG( 0, ( "add_name_to_subnet: malloc fail when creating ip_flgs.\n" ) );
 203
 204      ZERO_STRUCTP(namerec);
 205      SAFE_FREE( namerec );
 206      return NULL;
 207   }
 208
 209   namerec->subnet = subrec;
 210
 211   make_nmb_name(&namerec->name, name, type);
 212   upcase_name(&namerec->name, NULL );
 213
 214   /* Enter the name as active. */
 215   namerec->data.nb_flags = nb_flags | NB_ACTIVE;
 216
 217   /* If it's our primary name, flag it as so. */
 218   if( strequal( my_netbios_names[0], name ) )
 219     namerec->data.nb_flags |= NB_PERM;
 220
 221   /* Copy the IPs. */
 222   namerec->data.num_ips = num_ips;
 223   memcpy( (namerec->data.ip), iplist, num_ips * sizeof(struct in_addr) );
 224
 225   /* Data source. */
 226   namerec->data.source = source;
 227
 228   /* Setup the death_time and refresh_time. */
 229   if( ttl == PERMANENT_TTL )
 230     namerec->data.death_time = PERMANENT_TTL;
 231   else
 232     namerec->data.death_time = time_now + ttl;
 233
 234   namerec->data.refresh_time = time_now + MIN((ttl/2), MAX_REFRESH_TIME);
 235
 236   /* Now add the record to the name list. */
 237   update_name_in_namelist( subrec, namerec );
 238
 239   DEBUG( 3, ( "add_name_to_subnet: Added netbios name %s with first IP %s \
 240 ttl=%d nb_flags=%2x to subnet %s\n",
 241             nmb_namestr( &namerec->name ),
 242             inet_ntoa( *iplist ),
 243             ttl,
 244             (unsigned int)nb_flags,
 245             subrec->subnet_name ) );
 246
 247   subrec->namelist_changed = True;
 248
 249   return(namerec);
 250 }
 251
 252 /*******************************************************************
 253  Utility function automatically called when a name refresh or register
 254  succeeds. By definition this is a SELF_NAME (or we wouldn't be registering
 255  it).
 256  ******************************************************************/
 257
 258 void standard_success_register(struct subnet_record *subrec,
 259                              struct userdata_struct *userdata,
 260                              struct nmb_name *nmbname, uint16 nb_flags, int ttl,
 261                              struct in_addr registered_ip)
 262 {
 263   struct name_record *namerec;
 264
 265   namerec = find_name_on_subnet( subrec, nmbname, FIND_SELF_NAME );
 266   if( NULL == namerec )
 267     (void)add_name_to_subnet( subrec, nmbname->name, nmbname->name_type,
 268                               nb_flags, ttl, SELF_NAME, 1, &registered_ip );
 269   else
 270     update_name_ttl( namerec, ttl );
 271 }
 272
 273 /*******************************************************************
 274  Utility function automatically called when a name refresh or register
 275  fails. Note that this is only ever called on a broadcast subnet with
 276  one IP address per name. This is why it can just delete the name
 277  without enumerating the IP adresses. JRA.
 278  ******************************************************************/
 279
 280 void standard_fail_register( struct subnet_record   *subrec,
 281                              struct response_record *rrec,
 282                              struct nmb_name        *nmbname )
 283 {
 284   struct name_record *namerec;
 285
 286   namerec = find_name_on_subnet( subrec, nmbname, FIND_SELF_NAME );
 287
 288   DEBUG( 0, ( "standard_fail_register: Failed to register/refresh name %s \
 289 on subnet %s\n",
 290             nmb_namestr(nmbname), subrec->subnet_name) );
 291
 292   /* Remove the name from the subnet. */
 293   if( namerec )
 294     remove_name_from_namelist(subrec, namerec);
 295 }
 296
 297 /*******************************************************************
 298  Utility function to remove an IP address from a name record.
 299  ******************************************************************/
 300
 301 static void remove_nth_ip_in_record( struct name_record *namerec, int ind)
 302 {
 303   if( ind != namerec->data.num_ips )
 304     memmove( (char *)(&namerec->data.ip[ind]),
 305              (char *)(&namerec->data.ip[ind+1]),
 306              ( namerec->data.num_ips - ind - 1) * sizeof(struct in_addr) );
 307
 308   namerec->data.num_ips--;
 309   namerec->subnet->namelist_changed = True;
 310 }
 311
 312 /*******************************************************************
 313  Utility function to check if an IP address exists in a name record.
 314  ******************************************************************/
 315
 316 BOOL find_ip_in_name_record( struct name_record *namerec, struct in_addr ip )
 317 {
 318   int i;
 319
 320   for(i = 0; i < namerec->data.num_ips; i++)
 321     if(ip_equal( namerec->data.ip[i], ip))
 322       return True;
 323
 324   return False;
 325 }
 326
 327 /*******************************************************************
 328  Utility function to add an IP address to a name record.
 329  ******************************************************************/
 330
 331 void add_ip_to_name_record( struct name_record *namerec, struct in_addr new_ip )
 332 {
 333   struct in_addr *new_list;
 334
 335   /* Don't add one we already have. */
 336   if( find_ip_in_name_record( namerec, new_ip ) )
 337     return;
 338
 339   new_list = (struct in_addr *)malloc( (namerec->data.num_ips + 1)
 340                                        * sizeof(struct in_addr) );
 341   if( NULL == new_list )
 342   {
 343     DEBUG(0,("add_ip_to_name_record: Malloc fail !\n"));
 344     return;
 345   }
 346
 347   memcpy( (char *)new_list,
 348           (char *)namerec->data.ip,
 349           namerec->data.num_ips * sizeof(struct in_addr) );
 350   new_list[namerec->data.num_ips] = new_ip;
 351
 352   SAFE_FREE(namerec->data.ip);
 353   namerec->data.ip = new_list;
 354   namerec->data.num_ips += 1;
 355
 356   namerec->subnet->namelist_changed = True;
 357 }
 358
 359 /*******************************************************************
 360  Utility function to remove an IP address from a name record.
 361  ******************************************************************/
 362
 363 void remove_ip_from_name_record( struct name_record *namerec,
 364                                  struct in_addr      remove_ip )
 365 {
 366   /* Try and find the requested ip address - remove it. */
 367   int i;
 368   int orig_num = namerec->data.num_ips;
 369
 370   for(i = 0; i < orig_num; i++)
 371     if( ip_equal( remove_ip, namerec->data.ip[i]) )
 372     {
 373       remove_nth_ip_in_record( namerec, i);
 374       break;
 375     }
 376 }
 377
 378 /*******************************************************************
 379  Utility function that release_name callers can plug into as the
 380  success function when a name release is successful. Used to save
 381  duplication of success_function code.
 382  ******************************************************************/
 383
 384 void standard_success_release( struct subnet_record   *subrec,
 385                                struct userdata_struct *userdata,
 386                                struct nmb_name        *nmbname,
 387                                struct in_addr          released_ip )
 388 {
 389   struct name_record *namerec;
 390
 391   namerec = find_name_on_subnet( subrec, nmbname, FIND_ANY_NAME );
 392
 393   if( namerec == NULL )
 394   {
 395     DEBUG( 0, ( "standard_success_release: Name release for name %s IP %s \
 396 on subnet %s. Name was not found on subnet.\n",
 397                 nmb_namestr(nmbname),
 398                 inet_ntoa(released_ip),
 399                 subrec->subnet_name) );
 400     return;
 401   }
 402   else
 403   {
 404     int orig_num = namerec->data.num_ips;
 405
 406     remove_ip_from_name_record( namerec, released_ip );
 407
 408     if( namerec->data.num_ips == orig_num )
 409       DEBUG( 0, ( "standard_success_release: Name release for name %s IP %s \
 410 on subnet %s. This ip is not known for this name.\n",
 411                 nmb_namestr(nmbname),
 412                 inet_ntoa(released_ip),
 413                 subrec->subnet_name ) );
 414   }
 415
 416   if( namerec->data.num_ips == 0 )
 417     remove_name_from_namelist( subrec, namerec );
 418 }
 419
 420 /*******************************************************************
 421   Expires old names in a subnet namelist.
 422   ******************************************************************/
 423
 424 void expire_names_on_subnet(struct subnet_record *subrec, time_t t)
 425 {
 426   struct name_record *namerec;
 427   struct name_record *next_namerec;
 428
 429   for( namerec = (struct name_record *)ubi_trFirst( subrec->namelist );
 430        namerec;
 431        namerec = next_namerec )
 432   {
 433     next_namerec = (struct name_record *)ubi_trNext( namerec );
 434     if( (namerec->data.death_time != PERMANENT_TTL)
 435      && (namerec->data.death_time < t) )
 436     {
 437       if( namerec->data.source == SELF_NAME )
 438       {
 439         DEBUG( 3, ( "expire_names_on_subnet: Subnet %s not expiring SELF \
 440 name %s\n",
 441                     subrec->subnet_name, nmb_namestr(&namerec->name) ) );
 442         namerec->data.death_time += 300;
 443         namerec->subnet->namelist_changed = True;
 444         continue;
 445       }
 446       DEBUG(3,("expire_names_on_subnet: Subnet %s - removing expired name %s\n",
 447                  subrec->subnet_name, nmb_namestr(&namerec->name)));
 448
 449       remove_name_from_namelist( subrec, namerec );
 450     }
 451   }
 452 }
 453
 454 /*******************************************************************
 455   Expires old names in all subnet namelists.
 456   ******************************************************************/
 457
 458 void expire_names(time_t t)
 459 {
 460   struct subnet_record *subrec;
 461
 462   for( subrec = FIRST_SUBNET;
 463        subrec;
 464        subrec = NEXT_SUBNET_INCLUDING_UNICAST(subrec) )
 465   {
 466     expire_names_on_subnet( subrec, t );
 467   }
 468 }
 469
 470 /****************************************************************************
 471   Add the magic samba names, useful for finding samba servers.
 472   These go directly into the name list for a particular subnet,
 473   without going through the normal registration process.
 474   When adding them to the unicast subnet, add them as a list of
 475   all broadcast subnet IP addresses.
 476 **************************************************************************/
 477
 478 void add_samba_names_to_subnet( struct subnet_record *subrec )
 479 {
 480   struct in_addr *iplist = &subrec->myip;
 481   int num_ips = 1;
 482
 483   /* These names are added permanently (ttl of zero) and will NOT be
 484      refreshed.  */
 485
 486   if( (subrec == unicast_subnet)
 487    || (subrec == wins_server_subnet)
 488    || (subrec == remote_broadcast_subnet) )
 489   {
 490     struct subnet_record *bcast_subrecs;
 491     int i;
 492     /* Create an IP list containing all our known subnets. */
 493
 494     num_ips = iface_count();
 495     iplist = (struct in_addr *)malloc( num_ips * sizeof(struct in_addr) );
 496     if( NULL == iplist )
 497     {
 498       DEBUG(0,("add_samba_names_to_subnet: Malloc fail !\n"));
 499       return;
 500     }
 501
 502     for( bcast_subrecs = FIRST_SUBNET, i = 0;
 503          bcast_subrecs;
 504          bcast_subrecs = NEXT_SUBNET_EXCLUDING_UNICAST(bcast_subrecs), i++ )
 505       iplist[i] = bcast_subrecs->myip;
 506
 507   }
 508
 509   (void)add_name_to_subnet(subrec,"*",0x0,samba_nb_type, PERMANENT_TTL,
 510                            PERMANENT_NAME, num_ips, iplist);
 511   (void)add_name_to_subnet(subrec,"*",0x20,samba_nb_type,PERMANENT_TTL,
 512                            PERMANENT_NAME, num_ips, iplist);
 513   (void)add_name_to_subnet(subrec,"__SAMBA__",0x20,samba_nb_type,PERMANENT_TTL,
 514                            PERMANENT_NAME, num_ips, iplist);
 515   (void)add_name_to_subnet(subrec,"__SAMBA__",0x00,samba_nb_type,PERMANENT_TTL,
 516                            PERMANENT_NAME, num_ips, iplist);
 517
 518   if(iplist != &subrec->myip)
 519     SAFE_FREE(iplist);
 520 }
 521
 522 /****************************************************************************
 523  Dump the contents of the namelists on all the subnets (including unicast)
 524  into a file. Initiated by SIGHUP - used to debug the state of the namelists.
 525 **************************************************************************/
 526
 527 static void dump_subnet_namelist( struct subnet_record *subrec, FILE *fp)
 528 {
 529   struct name_record *namerec;
 530   char *src_type;
 531   struct tm *tm;
 532   int i;
 533
 534   fprintf(fp, "Subnet %s\n----------------------\n", subrec->subnet_name);
 535   for( namerec = (struct name_record *)ubi_trFirst( subrec->namelist );
 536        namerec;
 537        namerec = (struct name_record *)ubi_trNext( namerec ) )
 538   {
 539     fprintf(fp,"\tName = %s\t", nmb_namestr(&namerec->name));
 540     switch(namerec->data.source)
 541     {
 542       case LMHOSTS_NAME:
 543         src_type = "LMHOSTS_NAME";
 544         break;
 545       case WINS_PROXY_NAME:
 546         src_type = "WINS_PROXY_NAME";
 547         break;
 548       case REGISTER_NAME:
 549         src_type = "REGISTER_NAME";
 550         break;
 551       case SELF_NAME:
 552         src_type = "SELF_NAME";
 553         break;
 554       case DNS_NAME:
 555         src_type = "DNS_NAME";
 556         break;
 557       case DNSFAIL_NAME:
 558         src_type = "DNSFAIL_NAME";
 559         break;
 560       case PERMANENT_NAME:
 561         src_type = "PERMANENT_NAME";
 562         break;
 563       default:
 564         src_type = "unknown!";
 565         break;
 566     }
 567     fprintf(fp,"Source = %s\nb_flags = %x\t", src_type, namerec->data.nb_flags);
 568
 569     if(namerec->data.death_time != PERMANENT_TTL)
 570     {
 571       tm = LocalTime(&namerec->data.death_time);
 572       fprintf(fp, "death_time = %s\t", asctime(tm));
 573     }
 574     else
 575       fprintf(fp, "death_time = PERMANENT\t");
 576
 577     if(namerec->data.refresh_time != PERMANENT_TTL)
 578     {
 579       tm = LocalTime(&namerec->data.refresh_time);
 580       fprintf(fp, "refresh_time = %s\n", asctime(tm));
 581     }
 582     else
 583       fprintf(fp, "refresh_time = PERMANENT\n");
 584
 585     fprintf(fp, "\t\tnumber of IPS = %d", namerec->data.num_ips);
 586     for(i = 0; i < namerec->data.num_ips; i++)
 587       fprintf(fp, "\t%s", inet_ntoa(namerec->data.ip[i]));
 588
 589     fprintf(fp, "\n\n");
 590   }
 591 }
 592
 593 /****************************************************************************
 594  Dump the contents of the namelists on all the subnets (including unicast)
 595  into a file. Initiated by SIGHUP - used to debug the state of the namelists.
 596 **************************************************************************/
 597
 598 void dump_all_namelists(void)
 599 {
 600   FILE *fp;
 601   struct subnet_record *subrec;
 602
 603   fp = sys_fopen(lock_path("namelist.debug"),"w");
 604
 605   if (!fp)
 606   {
 607     DEBUG(0,("dump_all_namelists: Can't open file %s. Error was %s\n",
 608               "namelist.debug",strerror(errno)));
 609     return;
 610   }
 611
 612   for( subrec = FIRST_SUBNET;
 613        subrec;
 614        subrec = NEXT_SUBNET_INCLUDING_UNICAST(subrec) )
 615     dump_subnet_namelist( subrec, fp );
 616
 617   if( !we_are_a_wins_client() )
 618     dump_subnet_namelist( unicast_subnet, fp );
 619
 620   if( remote_broadcast_subnet->namelist != NULL )
 621     dump_subnet_namelist( remote_broadcast_subnet, fp );
 622
 623   if( wins_server_subnet != NULL )
 624     dump_subnet_namelist( wins_server_subnet, fp );
 625   fclose( fp );
 626 }