source3/nameservresp.c

   1 /*
   2    Unix SMB/Netbios implementation.
   3    Version 1.9.
   4    NBT netbios routines and daemon - version 2
   5    Copyright (C) Andrew Tridgell 1994-1996
   6
   7    This program is free software; you can redistribute it and/or modify
   8    it under the terms of the GNU General Public License as published by
   9    the Free Software Foundation; either version 2 of the License, or
  10    (at your option) any later version.
  11
  12    This program is distributed in the hope that it will be useful,
  13    but WITHOUT ANY WARRANTY; without even the implied warranty of
  14    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  15    GNU General Public License for more details.
  16
  17    You should have received a copy of the GNU General Public License
  18    along with this program; if not, write to the Free Software
  19    Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
  20
  21    Revision History:
  22
  23    Module name: nameservresp.c
  24
  25    14 jan 96: lkcl@pires.co.uk
  26    added multiple workgroup domain master support
  27
  28    05 jul 96: lkcl@pires.co.uk
  29    created module nameservresp containing NetBIOS response functions
  30
  31 */
  32
  33 #include "includes.h"
  34
  35 extern int ClientNMB;
  36
  37 extern int DEBUGLEVEL;
  38
  39 extern pstring scope;
  40 extern struct in_addr ipzero;
  41
  42 #define GET_TTL(ttl) ((ttl)?MIN(ttl,lp_max_ttl()):lp_max_ttl())
  43
  44
  45 /****************************************************************************
  46   response for a reg release received. samba has asked a WINS server if it
  47   could release a name.
  48   **************************************************************************/
  49 static void response_name_release(struct nmb_name *ans_name,
  50                         struct subnet_record *d, struct packet_struct *p)
  51 {
  52   struct nmb_packet *nmb = &p->packet.nmb;
  53   char *name = ans_name->name;
  54   int   type = ans_name->name_type;
  55
  56   DEBUG(4,("response name release received\n"));
  57
  58   if (nmb->header.rcode == 0 && nmb->answers->rdata)
  59   {
  60     /* IMPORTANT: see expire_netbios_response_entries() */
  61
  62     struct in_addr found_ip;
  63     putip((char*)&found_ip,&nmb->answers->rdata[2]);
  64
  65     /* NOTE: we only release our own names at present */
  66     if (ismyip(found_ip))
  67     {
  68       name_unregister_work(d,name,type);
  69     }
  70     else
  71     {
  72       DEBUG(2,("name release for different ip! %s %s\n",
  73                   inet_ntoa(found_ip), namestr(ans_name)));
  74     }
  75   }
  76   else
  77   {
  78     DEBUG(2,("name release for %s rejected!\n", namestr(ans_name)));
  79
  80     /* XXXX PANIC! what to do if it's one of samba's own names? */
  81
  82     /* XXXX do we honestly care if our name release was rejected?
  83        only if samba is issuing the release on behalf of some out-of-sync
  84        server. if it's one of samba's SELF names, we don't care. */
  85   }
  86 }
  87
  88
  89 /****************************************************************************
  90 response for a reg request received
  91 **************************************************************************/
  92 static void response_name_reg(struct nmb_name *ans_name,
  93                         struct subnet_record *d, struct packet_struct *p)
  94 {
  95   struct nmb_packet *nmb = &p->packet.nmb;
  96   BOOL bcast = nmb->header.nm_flags.bcast;
  97   char *name = ans_name->name;
  98   int   type = ans_name->name_type;
  99
 100   DEBUG(4,("response name registration received!\n"));
 101
 102   if (nmb->header.rcode == 0 && nmb->answers->rdata)
 103   {
 104     /* IMPORTANT: see expire_netbios_response_entries() */
 105
 106     int nb_flags = nmb->answers->rdata[0];
 107     int ttl = nmb->answers->ttl;
 108     struct in_addr found_ip;
 109
 110     putip((char*)&found_ip,&nmb->answers->rdata[2]);
 111
 112     name_register_work(d,name,type,nb_flags,ttl,found_ip,bcast);
 113   }
 114   else
 115   {
 116     DEBUG(2,("name registration for %s rejected!\n", namestr(ans_name)));
 117
 118         /* oh dear. we have problems. possibly unbecome a master browser. */
 119     name_unregister_work(d,name,type);
 120   }
 121 }
 122
 123
 124 /****************************************************************************
 125   response from a name query announce host
 126   NAME_QUERY_ANNOUNCE_HOST is dealt with here
 127   ****************************************************************************/
 128 static void response_announce_host(struct nmb_name *ans_name,
 129                 struct nmb_packet *nmb,
 130                 struct response_record *n, struct subnet_record *d)
 131 {
 132         DEBUG(4, ("Name query at %s ip %s - ",
 133                   namestr(&n->name), inet_ntoa(n->send_ip)));
 134
 135         if (!name_equal(&n->name, ans_name))
 136         {
 137                 /* someone gave us the wrong name as a reply. oops. */
 138                 /* XXXX should say to them 'oi! release that name!' */
 139
 140                 DEBUG(4,("unexpected name received: %s\n", namestr(ans_name)));
 141                 return;
 142         }
 143
 144         if (nmb->header.rcode == 0 && nmb->answers->rdata)
 145     {
 146                 /* we had sent out a name query to the current owner
 147                    of a name because someone else wanted it. now they
 148                    have responded saying that they still want the name,
 149                    so the other host can't have it.
 150                  */
 151
 152                 /* first check all the details are correct */
 153
 154                 int nb_flags = nmb->answers->rdata[0];
 155                 struct in_addr found_ip;
 156
 157                 putip((char*)&found_ip,&nmb->answers->rdata[2]);
 158
 159                 if (nb_flags != n->nb_flags)
 160                 {
 161                         /* someone gave us the wrong nb_flags as a reply. oops. */
 162                         /* XXXX should say to them 'oi! release that name!' */
 163
 164                         DEBUG(4,("expected nb_flags: %d\n", n->nb_flags));
 165                         DEBUG(4,("unexpected nb_flags: %d\n", nb_flags));
 166                         return;
 167                 }
 168
 169         /* do an announce host */
 170         do_announce_host(ANN_HostAnnouncement,
 171                                 n->my_name  , 0x00, d->myip,
 172                                 n->name.name, 0x1d, found_ip,
 173                                 n->ttl,
 174                                 n->my_name, n->server_type, n->my_comment);
 175         }
 176         else
 177         {
 178                 /* XXXX negative name query response. no master exists. oops */
 179         }
 180 }
 181
 182
 183 /****************************************************************************
 184   response from a name query server check. states of type NAME_QUERY_DOM_SRV_CHK,
 185   NAME_QUERY_SRV_CHK, and NAME_QUERY_FIND_MST dealt with here.
 186   ****************************************************************************/
 187 static void response_server_check(struct nmb_name *ans_name,
 188                 struct response_record *n, struct subnet_record *d)
 189 {
 190     /* issue another state: this time to do a name status check */
 191
 192     enum state_type cmd = (n->state == NAME_QUERY_DOM_SRV_CHK) ?
 193               NAME_STATUS_DOM_SRV_CHK : NAME_STATUS_SRV_CHK;
 194
 195     /* initiate a name status check on the server that replied */
 196     queue_netbios_packet(d,ClientNMB,NMB_STATUS, cmd,
 197                                 ans_name->name, ans_name->name_type,
 198                                 0,0,0,NULL,NULL,
 199                                 False,False,n->send_ip,n->reply_to_ip);
 200 }
 201
 202
 203 /****************************************************************************
 204   interpret a node status response. this is pretty hacked: we need two bits of
 205   info. a) the name of the workgroup b) the name of the server. it will also
 206   add all the names it finds into the namelist.
 207 ****************************************************************************/
 208 static BOOL interpret_node_status(struct subnet_record *d,
 209                                 char *p, struct nmb_name *name,int t,
 210                            char *serv_name, struct in_addr ip, BOOL bcast)
 211 {
 212   int numnames = CVAL(p,0);
 213   BOOL found = False;
 214
 215   DEBUG(4,("received %d names\n",numnames));
 216
 217   p += 1;
 218
 219   if (serv_name) *serv_name = 0;
 220
 221   while (numnames--)
 222     {
 223       char qname[17];
 224       int type;
 225       fstring flags;
 226       int nb_flags;
 227
 228       BOOL group = False;
 229       BOOL add   = False;
 230
 231       *flags = 0;
 232
 233       StrnCpy(qname,p,15);
 234       type = CVAL(p,15);
 235       nb_flags = p[16];
 236       trim_string(qname,NULL," ");
 237
 238       p += 18;
 239
 240       if (NAME_GROUP    (nb_flags)) { strcat(flags,"<GROUP> "); group=True;}
 241       if (NAME_BFLAG    (nb_flags)) { strcat(flags,"B "); }
 242       if (NAME_PFLAG    (nb_flags)) { strcat(flags,"P "); }
 243       if (NAME_MFLAG    (nb_flags)) { strcat(flags,"M "); }
 244       if (NAME_HFLAG    (nb_flags)) { strcat(flags,"H "); }
 245       if (NAME_DEREG    (nb_flags)) { strcat(flags,"<DEREGISTERING> "); }
 246       if (NAME_CONFLICT (nb_flags)) { strcat(flags,"<CONFLICT> "); add=True;}
 247       if (NAME_ACTIVE   (nb_flags)) { strcat(flags,"<ACTIVE> "); add=True; }
 248       if (NAME_PERMANENT(nb_flags)) { strcat(flags,"<PERMANENT> "); add=True;}
 249
 250       /* might as well update our namelist while we're at it */
 251       if (add)
 252         {
 253           struct in_addr nameip;
 254           enum name_source src;
 255
 256           if (ismyip(ip)) {
 257             nameip = ipzero;
 258             src = SELF;
 259           } else {
 260             nameip = ip;
 261             src = STATUS_QUERY;
 262           }
 263           add_netbios_entry(d,qname,type,nb_flags,2*60*60,src,nameip,True,bcast);
 264         }
 265
 266       /* we want the server name */
 267       if (serv_name && !*serv_name && !group && t == 0)
 268         {
 269           StrnCpy(serv_name,qname,15);
 270           serv_name[15] = 0;
 271         }
 272
 273       /* looking for a name and type? */
 274       if (name && !found && (t == type))
 275         {
 276           /* take a guess at some of the name types we're going to ask for.
 277              evaluate whether they are group names or no... */
 278           if (((t == 0x1b || t == 0x1d             ) && !group) ||
 279               ((t == 0x20 || t == 0x1c || t == 0x1e) &&  group))
 280             {
 281               found = True;
 282               make_nmb_name(name,qname,type,scope);
 283             }
 284         }
 285
 286       DEBUG(4,("\t%s(0x%x)\t%s\n",qname,type,flags));
 287     }
 288   DEBUG(4,("num_good_sends=%d num_good_receives=%d\n",
 289                IVAL(p,20),IVAL(p,24)));
 290   return found;
 291 }
 292
 293
 294 /****************************************************************************
 295   response from a name status check. states of type NAME_STATUS_DOM_SRV_CHK
 296   and NAME_STATUS_SRV_CHK dealt with here.
 297   ****************************************************************************/
 298 static void response_name_status_check(struct in_addr ip,
 299                 struct nmb_packet *nmb, BOOL bcast,
 300                 struct response_record *n, struct subnet_record *d)
 301 {
 302         /* NMB_STATUS arrives: contains workgroup name and server name required.
 303        amongst other things. */
 304
 305         struct nmb_name name;
 306         fstring serv_name;
 307
 308         if (interpret_node_status(d,nmb->answers->rdata,
 309                                   &name,name.name_type,serv_name,ip,bcast))
 310         {
 311                 if (*serv_name)
 312                 {
 313                         sync_server(n->state,serv_name,
 314                                     name.name,name.name_type, n->send_ip);
 315                 }
 316         }
 317         else
 318         {
 319                 DEBUG(1,("No 0x1d name type in interpret_node_status()\n"));
 320         }
 321 }
 322
 323
 324 /****************************************************************************
 325   response from a name query for secured WINS registration. a state of
 326   NAME_REGISTER_CHALLENGE is dealt with here.
 327   ****************************************************************************/
 328 static void response_name_query_register(struct nmb_packet *nmb,
 329                 struct nmb_name *ans_name,
 330                 struct response_record *n, struct subnet_record *d)
 331 {
 332         struct in_addr register_ip;
 333         BOOL new_owner;
 334
 335         DEBUG(4, ("Name query at %s ip %s - ",
 336                   namestr(&n->name), inet_ntoa(n->send_ip)));
 337
 338         if (!name_equal(&n->name, ans_name))
 339         {
 340                 /* someone gave us the wrong name as a reply. oops. */
 341                 /* XXXX should say to them 'oi! release that name!' */
 342
 343                 DEBUG(4,("unexpected name received: %s\n", namestr(ans_name)));
 344                 return;
 345         }
 346
 347         if (nmb->header.rcode == 0 && nmb->answers->rdata)
 348     {
 349                 /* we had sent out a name query to the current owner
 350                    of a name because someone else wanted it. now they
 351                    have responded saying that they still want the name,
 352                    so the other host can't have it.
 353                  */
 354
 355                 /* first check all the details are correct */
 356
 357                 int nb_flags = nmb->answers->rdata[0];
 358                 struct in_addr found_ip;
 359
 360                 putip((char*)&found_ip,&nmb->answers->rdata[2]);
 361
 362                 if (nb_flags != n->nb_flags)
 363                 {
 364                         /* someone gave us the wrong nb_flags as a reply. oops. */
 365                         /* XXXX should say to them 'oi! release that name!' */
 366
 367                         DEBUG(4,("expected nb_flags: %d\n", n->nb_flags));
 368                         DEBUG(4,("unexpected nb_flags: %d\n", nb_flags));
 369                         return;
 370                 }
 371
 372                 if (!ip_equal(n->send_ip, found_ip))
 373                 {
 374                         /* someone gave us the wrong ip as a reply. oops. */
 375                         /* XXXX should say to them 'oi! release that name!' */
 376
 377                         DEBUG(4,("expected ip: %s\n", inet_ntoa(n->send_ip)));
 378                         DEBUG(4,("unexpected ip: %s\n", inet_ntoa(found_ip)));
 379                         return;
 380                 }
 381
 382                 DEBUG(4, (" OK: %s\n", inet_ntoa(found_ip)));
 383
 384                 /* fine: now tell the other host they can't have the name */
 385                 register_ip = n->send_ip;
 386                 new_owner = False;
 387         }
 388         else
 389         {
 390                 DEBUG(4, (" NEGATIVE RESPONSE!\n"));
 391
 392                 /* the owner didn't want the name: the other host can have it */
 393                 register_ip = n->reply_to_ip;
 394                 new_owner = True;
 395         }
 396
 397         /* register the old or the new owners' ip */
 398         add_name_respond(d, n->fd, d->myip, n->response_id,&n->name,n->nb_flags,
 399                                         GET_TTL(0), register_ip,
 400                                         new_owner, n->reply_to_ip);
 401 }
 402
 403
 404 /****************************************************************************
 405   response from a name query to sync browse lists or to update our netbios
 406   entry. states of type NAME_QUERY_SYNC and NAME_QUERY_CONFIRM
 407   ****************************************************************************/
 408 static void response_name_query_sync(struct nmb_packet *nmb,
 409                 struct nmb_name *ans_name, BOOL bcast,
 410                 struct response_record *n, struct subnet_record *d)
 411 {
 412         DEBUG(4, ("Name query at %s ip %s - ",
 413                   namestr(&n->name), inet_ntoa(n->send_ip)));
 414
 415         if (!name_equal(&n->name, ans_name))
 416         {
 417                 /* someone gave us the wrong name as a reply. oops. */
 418                 DEBUG(4,("unexpected name received: %s\n", namestr(ans_name)));
 419                 return;
 420         }
 421
 422         if (nmb->header.rcode == 0 && nmb->answers->rdata)
 423     {
 424                 int nb_flags = nmb->answers->rdata[0];
 425                 struct in_addr found_ip;
 426
 427                 putip((char*)&found_ip,&nmb->answers->rdata[2]);
 428
 429                 if (!ip_equal(n->send_ip, found_ip))
 430                 {
 431                         /* someone gave us the wrong ip as a reply. oops. */
 432                         DEBUG(4,("expected ip: %s\n", inet_ntoa(n->send_ip)));
 433                         DEBUG(4,("unexpected ip: %s\n", inet_ntoa(found_ip)));
 434                         return;
 435                 }
 436
 437                 DEBUG(4, (" OK: %s\n", inet_ntoa(found_ip)));
 438
 439                 if (n->state == NAME_QUERY_SYNC_LOCAL ||
 440                     n->state == NAME_QUERY_SYNC_REMOTE)
 441                 {
 442                         struct work_record *work = NULL;
 443                         if ((work = find_workgroupstruct(d, ans_name->name, False)))
 444                         {
 445                                 BOOL local_list_only = n->state == NAME_QUERY_SYNC_LOCAL;
 446
 447                                 /* the server is there: sync quick before it (possibly) dies! */
 448                                 sync_browse_lists(d, work, ans_name->name, ans_name->name_type,
 449                                                         found_ip, local_list_only);
 450                         }
 451                 }
 452                 else
 453                 {
 454                         /* update our netbios name list (re-register it if necessary) */
 455                         add_netbios_entry(d, ans_name->name, ans_name->name_type,
 456                                                                 nb_flags,GET_TTL(0),REGISTER,
 457                                                                 found_ip,False,!bcast);
 458                 }
 459         }
 460         else
 461         {
 462                 DEBUG(4, (" NEGATIVE RESPONSE!\n"));
 463
 464                 if (n->state == NAME_QUERY_CONFIRM)
 465                 {
 466                         /* XXXX remove_netbios_entry()? */
 467                         /* lots of things we ought to do, here. if we get here,
 468                            then we're in a mess: our name database doesn't match
 469                            reality. sort it out
 470              */
 471                 remove_netbios_name(d,n->name.name, n->name.name_type,
 472                                                                 REGISTER,n->send_ip);
 473                 }
 474         }
 475 }
 476
 477
 478 /****************************************************************************
 479   report the response record type
 480   ****************************************************************************/
 481 static void debug_rr_type(int rr_type)
 482 {
 483   switch (rr_type)
 484   {
 485       case NMB_STATUS: DEBUG(3,("Name status ")); break;
 486           case NMB_QUERY : DEBUG(3,("Name query ")); break;
 487           case NMB_REG   : DEBUG(3,("Name registration ")); break;
 488           case NMB_REL   : DEBUG(3,("Name release ")); break;
 489       default        : DEBUG(1,("wrong response packet type received")); break;
 490   }
 491 }
 492
 493 /****************************************************************************
 494   report the response record nmbd state
 495   ****************************************************************************/
 496 void debug_state_type(int state)
 497 {
 498   /* report the state type to help debugging */
 499   switch (state)
 500   {
 501     case NAME_QUERY_DOM_SRV_CHK  : DEBUG(4,("MASTER_SVR_CHECK\n")); break;
 502     case NAME_QUERY_SRV_CHK      : DEBUG(4,("NAME_QUERY_SRV_CHK\n")); break;
 503     case NAME_QUERY_FIND_MST     : DEBUG(4,("NAME_QUERY_FIND_MST\n")); break;
 504     case NAME_QUERY_MST_CHK      : DEBUG(4,("NAME_QUERY_MST_CHK\n")); break;
 505     case NAME_QUERY_CONFIRM      : DEBUG(4,("NAME_QUERY_CONFIRM\n")); break;
 506     case NAME_QUERY_SYNC_LOCAL   : DEBUG(4,("NAME_QUERY_SYNC_LOCAL\n")); break;
 507     case NAME_QUERY_SYNC_REMOTE  : DEBUG(4,("NAME_QUERY_SYNC_REMOTE\n")); break;
 508     case NAME_QUERY_ANNOUNCE_HOST: DEBUG(4,("NAME_QUERY_ANNCE_HOST\n"));break;
 509
 510     case NAME_REGISTER           : DEBUG(4,("NAME_REGISTER\n")); break;
 511     case NAME_REGISTER_CHALLENGE : DEBUG(4,("NAME_REGISTER_CHALLENGE\n"));break;
 512
 513     case NAME_RELEASE            : DEBUG(4,("NAME_RELEASE\n")); break;
 514
 515     case NAME_STATUS_DOM_SRV_CHK : DEBUG(4,("NAME_STAT_MST_CHK\n")); break;
 516     case NAME_STATUS_SRV_CHK     : DEBUG(4,("NAME_STATUS_SRV_CHK\n")); break;
 517
 518     default: break;
 519   }
 520 }
 521
 522 /****************************************************************************
 523   report any problems with the fact that a response has been received.
 524
 525   (responses for certain types of operations are only expected from one host)
 526   ****************************************************************************/
 527 static BOOL response_problem_check(struct response_record *n,
 528                         struct nmb_packet *nmb, char *ans_name)
 529 {
 530   switch (nmb->answers->rr_type)
 531   {
 532     case NMB_REL:
 533     {
 534         if (n->num_msgs > 1)
 535         {
 536             DEBUG(1,("more than one release name response received!\n"));
 537             return True;
 538         }
 539         break;
 540     }
 541
 542     case NMB_REG:
 543     {
 544         if (n->num_msgs > 1)
 545         {
 546             DEBUG(1,("more than one register name response received!\n"));
 547             return True;
 548         }
 549         break;
 550     }
 551
 552     case NMB_QUERY:
 553     {
 554       if (n->num_msgs > 1)
 555       {
 556                   if (nmb->header.rcode == 0 && nmb->answers->rdata)
 557                   {
 558                         int nb_flags = nmb->answers->rdata[0];
 559
 560                         if ((!NAME_GROUP(nb_flags)))
 561                         {
 562                            /* oh dear. more than one person responded to a unique name.
 563                                   there is either a network problem, a configuration problem
 564                                   or a server is mis-behaving */
 565
 566                            /* XXXX mark the name as in conflict, and then let the
 567                                   person who just responded know that they must also mark it
 568                                   as in conflict, and therefore must NOT use it.
 569                   see rfc1001.txt 15.1.3.5 */
 570
 571                /* this may cause problems for some early versions of nmbd */
 572
 573                switch (n->state)
 574                {
 575                 case NAME_QUERY_FIND_MST:
 576                 {
 577                   /* query for ^1^2__MSBROWSE__^2^1 expect lots of responses */
 578                   return False;
 579                 }
 580                         case NAME_QUERY_ANNOUNCE_HOST:
 581                         case NAME_QUERY_DOM_SRV_CHK:
 582                 case NAME_QUERY_SRV_CHK:
 583                 case NAME_QUERY_MST_CHK:
 584                 {
 585                       if (!strequal(ans_name,n->name.name))
 586                       {
 587                              /* one subnet, one master browser per workgroup */
 588                              /* XXXX force an election? */
 589
 590                              DEBUG(3,("more than one master browser replied!\n"));
 591                                  return True;
 592                           }
 593                    break;
 594                 }
 595                 default: break;
 596                }
 597                DEBUG(3,("Unique Name conflict detected!\n"));
 598                            return True;
 599                         }
 600                   }
 601                   else
 602                   {
 603              /* we have received a negative reply, having already received
 604                 at least one response (pos/neg). something's really wrong! */
 605
 606                  DEBUG(3,("wierd name query problem detected!\n"));
 607                      return True;
 608                   }
 609        }
 610     }
 611   }
 612   return False;
 613 }
 614
 615 #if 0
 616 /****************************************************************************
 617   check that the response received is compatible with the response record
 618   ****************************************************************************/
 619 static BOOL response_compatible(struct response_record *n,
 620                         struct nmb_packet *nmb)
 621 {
 622   switch (n->state)
 623   {
 624     case NAME_RELEASE:
 625     {
 626                 if (nmb->answers->rr_type != 0x20)
 627                 {
 628                         DEBUG(1,("Name release reply has wrong answer rr_type\n"));
 629                         return False;
 630                 }
 631         break;
 632     }
 633
 634     case NAME_REGISTER:
 635     {
 636                 if (nmb->answers->rr_type != 0x20)
 637                 {
 638                         DEBUG(1,("Name register reply has wrong answer rr_type\n"));
 639                         return False;
 640                 }
 641         break;
 642     }
 643
 644     case NAME_REGISTER_CHALLENGE: /* this is a query: we then do a register */
 645     case NAME_QUERY_CONFIRM:
 646     case NAME_QUERY_ANNOUNCE_HOST:
 647     case NAME_QUERY_SYNC_LOCAL:
 648     case NAME_QUERY_SYNC_REMOTE:
 649     case NAME_QUERY_DOM_SRV_CHK:
 650     case NAME_QUERY_SRV_CHK:
 651     case NAME_QUERY_FIND_MST:
 652     case NAME_QUERY_MST_CHK:
 653     {
 654                 if (nmb->answers->rr_type != 0x20)
 655                 {
 656                         DEBUG(1,("Name query reply has wrong answer rr_type\n"));
 657                         return False;
 658                 }
 659                 break;
 660     }
 661
 662     case NAME_STATUS_DOM_SRV_CHK:
 663     case NAME_STATUS_SRV_CHK:
 664     {
 665                 if (nmb->answers->rr_type != 0x21)
 666                 {
 667                         DEBUG(1,("Name status reply has wrong answer rr_type\n"));
 668                         return False;
 669                 }
 670                 break;
 671     }
 672
 673     default:
 674     {
 675                 DEBUG(1,("unknown state type received in response_netbios_packet\n"));
 676                 return False;
 677     }
 678   }
 679   return True;
 680 }
 681 #endif
 682
 683
 684 /****************************************************************************
 685   process the response packet received
 686   ****************************************************************************/
 687 static void response_process(struct subnet_record *d, struct packet_struct *p,
 688                                 struct response_record *n, struct nmb_packet *nmb,
 689                                 BOOL bcast, struct nmb_name *ans_name)
 690 {
 691   switch (n->state)
 692   {
 693     case NAME_RELEASE:
 694     {
 695         response_name_release(ans_name, d, p);
 696         break;
 697     }
 698
 699     case NAME_REGISTER:
 700     {
 701         response_name_reg(ans_name, d, p);
 702         break;
 703     }
 704
 705     case NAME_REGISTER_CHALLENGE:
 706     {
 707         response_name_query_register(nmb, ans_name, n, d);
 708         break;
 709     }
 710
 711     case NAME_QUERY_DOM_SRV_CHK:
 712     case NAME_QUERY_SRV_CHK:
 713     case NAME_QUERY_FIND_MST:
 714     {
 715                 response_server_check(ans_name, n, d);
 716                 break;
 717     }
 718
 719     case NAME_STATUS_DOM_SRV_CHK:
 720     case NAME_STATUS_SRV_CHK:
 721     {
 722                 response_name_status_check(p->ip, nmb, bcast, n, d);
 723                 break;
 724     }
 725
 726     case NAME_QUERY_ANNOUNCE_HOST:
 727     {
 728                 response_announce_host(ans_name, nmb, n, d);
 729                 break;
 730     }
 731
 732     case NAME_QUERY_CONFIRM:
 733     case NAME_QUERY_SYNC_LOCAL:
 734     case NAME_QUERY_SYNC_REMOTE:
 735     {
 736                 response_name_query_sync(nmb, ans_name, bcast, n, d);
 737                 break;
 738     }
 739     case NAME_QUERY_MST_CHK:
 740     {
 741                 /* no action required here. it's when NO responses are received
 742                    that we need to do something. see expire_name_query_entries() */
 743
 744                 DEBUG(4, ("Master browser exists for %s at %s (just checking!)\n",
 745                                         namestr(&n->name), inet_ntoa(n->send_ip)));
 746                 break;
 747     }
 748
 749     default:
 750     {
 751                 DEBUG(1,("unknown state type received in response_netbios_packet\n"));
 752                 break;
 753     }
 754   }
 755 }
 756
 757
 758 /****************************************************************************
 759   response from a netbios packet.
 760   ****************************************************************************/
 761 void response_netbios_packet(struct packet_struct *p)
 762 {
 763   struct nmb_packet *nmb = &p->packet.nmb;
 764   struct nmb_name *ans_name = NULL;
 765   BOOL bcast = nmb->header.nm_flags.bcast;
 766   struct response_record *n;
 767   struct subnet_record *d = NULL;
 768
 769   if (!(n = find_response_record(&d,nmb->header.name_trn_id))) {
 770     DEBUG(2,("unknown netbios response (received late or from nmblookup?)\n"));
 771     return;
 772   }
 773
 774   if (!d)
 775   {
 776     DEBUG(2,("response packet: subnet %s not known\n", inet_ntoa(p->ip)));
 777     return;
 778   }
 779
 780   /* args wrong way round: spotted by ccm@shentel.net */
 781   if (!same_net(d->bcast_ip, p->ip, d->mask_ip)) /* copes with WINS 'subnet' */
 782   {
 783     DEBUG(2,("response from %s. ", inet_ntoa(p->ip)));
 784     DEBUG(2,("expected on subnet %s. hmm.\n", inet_ntoa(d->bcast_ip)));
 785     return;
 786   }
 787
 788   if (nmb->answers == NULL)
 789   {
 790       /* hm. the packet received was a response, but with no answer. wierd! */
 791       DEBUG(2,("NMB packet response from %s (bcast=%s) - UNKNOWN\n",
 792                inet_ntoa(p->ip), BOOLSTR(bcast)));
 793       return;
 794   }
 795
 796   ans_name = &nmb->answers->rr_name;
 797   DEBUG(3,("response for %s from %s (bcast=%s)\n",
 798            namestr(ans_name), inet_ntoa(p->ip), BOOLSTR(bcast)));
 799
 800   debug_rr_type(nmb->answers->rr_type);
 801
 802   n->num_msgs++; /* count number of responses received */
 803   n->repeat_count = 0; /* don't resend: see expire_netbios_packets() */
 804
 805   debug_state_type(n->state);
 806
 807   /* problem checking: multiple responses etc */
 808   if (response_problem_check(n, nmb, ans_name->name))
 809     return;
 810
 811   /* now deal with the current state */
 812   response_process(d, p, n, nmb, bcast, ans_name);
 813 }
 814
 815