packet-netbios.c

   1 /* packet-netbios.c
   2  * Routines for NetBIOS protocol packet disassembly
   3  * Jeff Foster <jfoste@woodward.com>
   4  * Copyright 1999 Jeffrey C. Foster
   5  *
   6  * derived from the packet-nbns.c
   7  *
   8  * $Id: packet-netbios.c,v 1.57 2003/04/20 11:36:14 guy Exp $
   9  *
  10  * Ethereal - Network traffic analyzer
  11  * By Gerald Combs <gerald@ethereal.com>
  12  * Copyright 1998 Gerald Combs
  13  *
  14  * This program is free software; you can redistribute it and/or
  15  * modify it under the terms of the GNU General Public License
  16  * as published by the Free Software Foundation; either version 2
  17  * of the License, or (at your option) any later version.
  18  *
  19  * This program is distributed in the hope that it will be useful,
  20  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  21  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  22  * GNU General Public License for more details.
  23  *
  24  * You should have received a copy of the GNU General Public License
  25  * along with this program; if not, write to the Free Software
  26  * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA  02111-1307, USA.
  27  */
  28
  29 #ifdef HAVE_CONFIG_H
  30 # include "config.h"
  31 #endif
  32
  33 #include <stdio.h>
  34 #include <string.h>
  35 #include <glib.h>
  36
  37 #include <epan/packet.h>
  38 #include "llcsaps.h"
  39 #include "reassemble.h"
  40 #include "prefs.h"
  41 #include "packet-netbios.h"
  42
  43 /* Netbios command numbers */
  44 #define NB_ADD_GROUP            0x00
  45 #define NB_ADD_NAME             0x01
  46 #define NB_NAME_IN_CONFLICT     0x02
  47 #define NB_STATUS_QUERY         0x03
  48 #define NB_TERMINATE_TRACE_R    0x07
  49 #define NB_DATAGRAM             0x08
  50 #define NB_DATAGRAM_BCAST       0x09
  51 #define NB_NAME_QUERY           0x0a
  52 #define NB_ADD_NAME_RESP        0x0d
  53 #define NB_NAME_RESP            0x0e
  54 #define NB_STATUS_RESP          0x0f
  55 #define NB_TERMINATE_TRACE_LR   0x13
  56 #define NB_DATA_ACK             0x14
  57 #define NB_DATA_FIRST_MIDDLE    0x15
  58 #define NB_DATA_ONLY_LAST       0x16
  59 #define NB_SESSION_CONFIRM      0x17
  60 #define NB_SESSION_END          0x18
  61 #define NB_SESSION_INIT         0x19
  62 #define NB_NO_RECEIVE           0x1a
  63 #define NB_RECEIVE_OUTSTANDING  0x1b
  64 #define NB_RECEIVE_CONTINUE     0x1c
  65 #define NB_KEEP_ALIVE           0x1f
  66
  67 /* Offsets of fields in the NetBIOS header. */
  68 #define NB_LENGTH               0
  69 #define NB_DELIMITER            2
  70 #define NB_COMMAND              4
  71 #define NB_FLAGS                5
  72 #define NB_DATA1                5
  73 #define NB_RESYNC               6
  74 #define NB_DATA2                6
  75 #define NB_CALL_NAME_TYPE       7
  76 #define NB_XMIT_CORL            8
  77 #define NB_RESP_CORL            10
  78 #define NB_RMT_SES              12
  79 #define NB_LOCAL_SES            13
  80 #define NB_RECVER_NAME          12
  81 #define NB_SENDER_NAME          28
  82
  83
  84 static int proto_netbios = -1;
  85 static int hf_netb_cmd = -1;
  86 static int hf_netb_hdr_len = -1;
  87 static int hf_netb_xmit_corrl = -1;
  88 static int hf_netb_resp_corrl = -1;
  89 static int hf_netb_call_name_type = -1;
  90 static int hf_netb_ack = -1;
  91 static int hf_netb_ack_with_data = -1;
  92 static int hf_netb_ack_expected = -1;
  93 static int hf_netb_recv_cont_req = -1;
  94 static int hf_netb_send_no_ack = -1;
  95 static int hf_netb_version = -1;
  96 static int hf_netb_largest_frame = -1;
  97 static int hf_netb_nb_name = -1;
  98 static int hf_netb_nb_name_type = -1;
  99 static int hf_netb_status_buffer_len = -1;
 100 static int hf_netb_status = -1;
 101 static int hf_netb_name_type = -1;
 102 static int hf_netb_max_data_recv_size = -1;
 103 static int hf_netb_termination_indicator = -1;
 104 static int hf_netb_num_data_bytes_accepted = -1;
 105 static int hf_netb_local_ses_no = -1;
 106 static int hf_netb_remote_ses_no = -1;
 107 static int hf_netb_data1 = -1;
 108 static int hf_netb_data2 = -1;
 109 static int hf_netb_fragments = -1;
 110 static int hf_netb_fragment = -1;
 111 static int hf_netb_fragment_overlap = -1;
 112 static int hf_netb_fragment_overlap_conflict = -1;
 113 static int hf_netb_fragment_multiple_tails = -1;
 114 static int hf_netb_fragment_too_long_fragment = -1;
 115 static int hf_netb_fragment_error = -1;
 116
 117 static gint ett_netb = -1;
 118 static gint ett_netb_name = -1;
 119 static gint ett_netb_flags = -1;
 120 static gint ett_netb_status = -1;
 121 static gint ett_netb_fragments = -1;
 122 static gint ett_netb_fragment = -1;
 123
 124 static const fragment_items netbios_frag_items = {
 125         &ett_netb_fragment,
 126         &ett_netb_fragments,
 127         &hf_netb_fragments,
 128         &hf_netb_fragment,
 129         &hf_netb_fragment_overlap,
 130         &hf_netb_fragment_overlap_conflict,
 131         &hf_netb_fragment_multiple_tails,
 132         &hf_netb_fragment_too_long_fragment,
 133         &hf_netb_fragment_error,
 134         NULL,
 135         "fragments"
 136 };
 137
 138 static dissector_handle_t data_handle;
 139
 140 /* The strings for the station type, used by get_netbios_name function;
 141    many of them came from the file "NetBIOS.txt" in the Zip archive at
 142
 143         http://www.net3group.com/ftp/browser.zip
 144  */
 145
 146 static const value_string nb_name_type_vals[] = {
 147         {0x00,  "Workstation/Redirector"},
 148         {0x01,  "Browser"},
 149         {0x02,  "Workstation/Redirector"},
 150                 /* not sure what 0x02 is, I'm seeing alot of them however */
 151                 /* i'm seeing them with workstation/redirection host
 152                         announcements */
 153         {0x03,  "Messenger service/Main name"},
 154         {0x05,  "Forwarded name"},
 155         {0x06,  "RAS Server service"},
 156         {0x1b,  "Domain Master Browser"},
 157         {0x1c,  "Domain Controllers"},
 158         {0x1d,  "Local Master Browser"},
 159         {0x1e,  "Browser Election Service"},
 160         {0x1f,  "Net DDE Service"},
 161         {0x20,  "Server service"},
 162         {0x21,  "RAS client service"},
 163         {0x22,  "Exchange Interchange (MSMail Connector)"},
 164         {0x23,  "Exchange Store"},
 165         {0x24,  "Exchange Directory"},
 166         {0x2b,  "Lotus Notes Server service"},
 167         {0x30,  "Modem sharing server service"},
 168         {0x31,  "Modem sharing client service"},
 169         {0x43,  "SMS Clients Remote Control"},
 170         {0x44,  "SMS Administrators Remote Control Tool"},
 171         {0x45,  "SMS Clients Remote Chat"},
 172         {0x46,  "SMS Clients Remote Transfer"},
 173         {0x4c,  "DEC Pathworks TCP/IP Service on Windows NT"},
 174         {0x52,  "DEC Pathworks TCP/IP Service on Windows NT"},
 175         {0x6a,  "Microsoft Exchange IMC"},
 176         {0x87,  "Microsoft Exchange MTA"},
 177         {0xbe,  "Network Monitor Agent"},
 178         {0xbf,  "Network Monitor Analyzer"},
 179         {0x00,  NULL}
 180 };
 181
 182 /* Tables for reassembly of fragments. */
 183 static GHashTable *netbios_fragment_table = NULL;
 184 static GHashTable *netbios_reassembled_table = NULL;
 185
 186 /* defragmentation of NetBIOS Frame */
 187 static gboolean netbios_defragment = TRUE;
 188
 189 /* See
 190
 191         http://www.s390.ibm.com/bookmgr-cgi/bookmgr.cmd/BOOKS/BK8P7001/CCONTENTS
 192
 193    and
 194
 195         http://ourworld.compuserve.com/homepages/TimothyDEvans/contents.htm
 196
 197    for information about the NetBIOS Frame Protocol (which is what this
 198    module dissects). */
 199
 200 /* the strings for the command types  */
 201
 202 static const value_string cmd_vals[] = {
 203         { NB_ADD_GROUP,                 "Add Group Name Query" },
 204         { NB_ADD_NAME,                  "Add Name Query" },
 205         { NB_NAME_IN_CONFLICT,          "Name In Conflict" },
 206         { NB_STATUS_QUERY,              "Status Query" },
 207         { NB_TERMINATE_TRACE_R,         "Terminate Trace" },
 208         { NB_DATAGRAM,                  "Datagram" },
 209         { NB_DATAGRAM_BCAST,            "Broadcast Datagram" },
 210         { NB_NAME_QUERY,                "Name Query" },
 211         { NB_ADD_NAME_RESP,             "Add Name Response" },
 212         { NB_NAME_RESP,                 "Name Recognized" },
 213         { NB_STATUS_RESP,               "Status Response" },
 214         { NB_TERMINATE_TRACE_LR,        "Terminate Trace" },
 215         { NB_DATA_ACK,                  "Data Ack" },
 216         { NB_DATA_FIRST_MIDDLE,         "Data First Middle" },
 217         { NB_DATA_ONLY_LAST,            "Data Only Last" },
 218         { NB_SESSION_CONFIRM,           "Session Confirm" },
 219         { NB_SESSION_END,               "Session End" },
 220         { NB_SESSION_INIT,              "Session Initialize" },
 221         { NB_NO_RECEIVE,                "No Receive" },
 222         { NB_RECEIVE_OUTSTANDING,       "Receive Outstanding" },
 223         { NB_RECEIVE_CONTINUE,          "Receive Continue" },
 224         { NB_KEEP_ALIVE,                "Session Alive" },
 225         { 0,                            NULL }
 226 };
 227
 228 static const value_string name_types[] = {
 229         { 0, "Unique name" },
 230         { 1, "Group name" },
 231         { 0, NULL }
 232 };
 233
 234 static const true_false_string flags_set = {
 235         "Set",
 236         "Not set"
 237 };
 238 static const true_false_string flags_allowed = {
 239         "Allowed",
 240         "Not allowed"
 241 };
 242 static const true_false_string flags_yes_no = {
 243         "Yes",
 244         "No"
 245 };
 246
 247 static const true_false_string netb_version_str = {
 248         "2.00 or higher",
 249         "1.xx"
 250 };
 251
 252 static const value_string termination_indicator_vals[] = {
 253         { 0x0000, "Normal session end" },
 254         { 0x0001, "Abnormal session end" },
 255         { 0,      NULL }
 256 };
 257
 258 static const value_string status_vals[] = {
 259         { 0, "Add name not in process" },
 260         { 1, "Add name in process" },
 261         { 0, NULL }
 262 };
 263
 264 static const value_string max_frame_size_vals[] = {
 265         { 0,    "516" },
 266         { 1,    "1500" },
 267         { 2,    "2052" },
 268         { 3,    "4472" },
 269         { 4,    "8144" },
 270         { 5,    "11407" },
 271         { 6,    "17800" },      /* 17800 in TR spec, 17749 in NBF spec */
 272         { 7,    "65535" },
 273         { 0,    NULL }
 274 };
 275
 276
 277 void capture_netbios(packet_counts *ld)
 278 {
 279         ld->netbios++;
 280 }
 281
 282
 283 int
 284 process_netbios_name(const guchar *name_ptr, char *name_ret)
 285 {
 286         int i;
 287         int name_type = *(name_ptr + NETBIOS_NAME_LEN - 1);
 288         guchar name_char;
 289         static const char hex_digits[16] = "0123456789abcdef";
 290
 291         for (i = 0; i < NETBIOS_NAME_LEN - 1; i++) {
 292                 name_char = *name_ptr++;
 293                 if (name_char >= ' ' && name_char <= '~')
 294                         *name_ret++ = name_char;
 295                 else {
 296                         /* It's not printable; show it as <XX>, where
 297                            XX is the value in hex. */
 298                         *name_ret++ = '<';
 299                         *name_ret++ = hex_digits[(name_char >> 4)];
 300                         *name_ret++ = hex_digits[(name_char & 0x0F)];
 301                         *name_ret++ = '>';
 302                 }
 303         }
 304         *name_ret = '\0';
 305
 306         /* Remove trailing space characters from name. */
 307
 308         name_ret--;
 309
 310         for (i = 0; i < NETBIOS_NAME_LEN - 1; i++) {
 311                 if (*name_ret != ' ') {
 312                         *(name_ret + 1) = 0;
 313                         break;
 314                 }
 315                 name_ret--;
 316         }
 317
 318         return name_type;
 319 }
 320
 321
 322 int get_netbios_name( tvbuff_t *tvb, int offset, char *name_ret)
 323
 324 {/*  Extract the name string and name type.  Return the name string in  */
 325  /* name_ret and return the name_type. */
 326
 327         return process_netbios_name( tvb_get_ptr( tvb, offset, NETBIOS_NAME_LEN ), name_ret);
 328 }
 329
 330
 331 /*
 332  * Get a string describing the type of a NetBIOS name.
 333  */
 334 char *
 335 netbios_name_type_descr(int name_type)
 336 {
 337         return val_to_str(name_type, nb_name_type_vals, "Unknown");
 338 }
 339
 340 void netbios_add_name(char* label, tvbuff_t *tvb, int offset,
 341     proto_tree *tree)
 342
 343 {/* add a name field display tree. Display the name and station type in sub-tree */
 344
 345         proto_tree *field_tree;
 346         proto_item *tf;
 347         char  name_str[(NETBIOS_NAME_LEN - 1)*4 + 1];
 348         int   name_type;
 349         char  *name_type_str;
 350
 351                                         /* decode the name field */
 352         name_type = get_netbios_name( tvb, offset, name_str);
 353         name_type_str = netbios_name_type_descr(name_type);
 354         tf = proto_tree_add_text( tree, tvb, offset, NETBIOS_NAME_LEN,
 355                 "%s: %s<%02x> (%s)", label, name_str, name_type, name_type_str);
 356
 357         field_tree = proto_item_add_subtree( tf, ett_netb_name);
 358         proto_tree_add_string_format( field_tree, hf_netb_nb_name, tvb, offset,
 359                 15, name_str, "%s", name_str);
 360         proto_tree_add_uint_format( field_tree, hf_netb_nb_name_type, tvb, offset + 15, 1, name_type,
 361             "0x%02x (%s)", name_type, name_type_str);
 362 }
 363
 364
 365 static void netbios_data_first_middle_flags( tvbuff_t *tvb, proto_tree *tree, int offset)
 366
 367 {
 368         proto_tree *field_tree;
 369         proto_item *tf;
 370         guint flags = tvb_get_guint8( tvb, offset);
 371
 372                 /* decode the flag field for Data First Middle packet*/
 373
 374         tf = proto_tree_add_text(tree, tvb, offset, 1,
 375                         "Flags: 0x%02x", flags);
 376         field_tree = proto_item_add_subtree(tf, ett_netb_flags);
 377
 378         proto_tree_add_boolean( field_tree, hf_netb_ack, tvb, offset, 1, flags);
 379
 380         proto_tree_add_boolean( field_tree, hf_netb_ack_expected, tvb, offset, 1, flags);
 381
 382         proto_tree_add_boolean( field_tree, hf_netb_recv_cont_req, tvb, offset, 1, flags);
 383 }
 384
 385 static void netbios_data_only_flags( tvbuff_t *tvb, proto_tree *tree,
 386    int offset)
 387 {
 388         proto_tree *field_tree;
 389         proto_item *tf;
 390         guint flags = tvb_get_guint8( tvb, offset);
 391
 392                 /* decode the flag field for Data Only Last packet*/
 393
 394         tf = proto_tree_add_text(tree, tvb, offset, 1,
 395                         "Flags: 0x%02x", flags);
 396         field_tree = proto_item_add_subtree(tf, ett_netb_flags);
 397
 398         proto_tree_add_boolean( field_tree, hf_netb_ack, tvb, offset, 1, flags);
 399
 400         proto_tree_add_boolean( field_tree, hf_netb_ack_with_data, tvb, offset, 1, flags);
 401
 402         proto_tree_add_boolean( field_tree, hf_netb_ack_expected, tvb, offset, 1, flags);
 403 }
 404
 405
 406
 407 static void netbios_add_ses_confirm_flags( tvbuff_t *tvb, proto_tree *tree,
 408         int offset)
 409 {
 410         proto_tree *field_tree;
 411         proto_item *tf;
 412         guint flags = tvb_get_guint8( tvb, offset);
 413
 414                 /* decode the flag field for Session Confirm packet */
 415         tf = proto_tree_add_text(tree, tvb, offset, 1,
 416                         "Flags: 0x%02x", flags);
 417         field_tree = proto_item_add_subtree( tf, ett_netb_flags);
 418
 419         proto_tree_add_boolean( field_tree, hf_netb_send_no_ack, tvb, offset, 1, flags);
 420
 421         proto_tree_add_boolean( field_tree, hf_netb_version, tvb, offset, 1, flags);
 422 }
 423
 424
 425 static void netbios_add_session_init_flags( tvbuff_t *tvb, proto_tree *tree,
 426         int offset)
 427 {
 428         proto_tree *field_tree;
 429         proto_item *tf;
 430         guint flags = tvb_get_guint8( tvb, offset);
 431                 /* decode the flag field for Session Init packet */
 432
 433         tf = proto_tree_add_text(tree, tvb, offset, 1,
 434                         "Flags: 0x%02x", flags);
 435         field_tree = proto_item_add_subtree(tf, ett_netb_flags);
 436
 437         proto_tree_add_boolean( field_tree, hf_netb_send_no_ack, tvb, offset, 1, flags);
 438
 439         proto_tree_add_uint( field_tree, hf_netb_largest_frame, tvb, offset, 1,
 440                 flags);
 441
 442         proto_tree_add_boolean( field_tree, hf_netb_version, tvb, offset, 1, flags);
 443 }
 444
 445
 446 static void netbios_no_receive_flags( tvbuff_t *tvb, proto_tree *tree,
 447     int offset)
 448
 449 {
 450         proto_tree *field_tree;
 451         proto_item *tf;
 452         guint flags = tvb_get_guint8( tvb, offset);
 453
 454                 /* decode the flag field for No Receive packet*/
 455
 456         tf = proto_tree_add_text(tree, tvb, offset, 1,
 457                         "Flags: 0x%02x", flags);
 458
 459         if (flags & 0x02) {
 460                 field_tree = proto_item_add_subtree(tf, ett_netb_flags);
 461                 proto_tree_add_text(field_tree, tvb, offset, 1, "%s",
 462                     decode_boolean_bitfield(flags, 0x02, 8,
 463                         "SEND.NO.ACK data not received", NULL));
 464         }
 465 }
 466
 467
 468 /************************************************************************/
 469 /*                                                                      */
 470 /*  The routines to display the netbios field values in the tree        */
 471 /*                                                                      */
 472 /************************************************************************/
 473
 474
 475 static void nb_xmit_corrl( tvbuff_t *tvb, int offset, proto_tree *tree)
 476
 477 {/* display the transmit correlator */
 478
 479         proto_tree_add_item( tree, hf_netb_xmit_corrl, tvb, offset + NB_XMIT_CORL,
 480                 2, TRUE);
 481 }
 482
 483
 484 static void nb_resp_corrl( tvbuff_t *tvb, int offset, proto_tree *tree)
 485
 486 {/* display the response correlator */
 487
 488         proto_tree_add_item( tree, hf_netb_resp_corrl, tvb, offset + NB_RESP_CORL,
 489                 2, TRUE);
 490 }
 491
 492
 493 static void nb_call_name_type( tvbuff_t *tvb, int offset, proto_tree *tree)
 494
 495 {/* display the call name type */
 496
 497         proto_tree_add_item( tree, hf_netb_call_name_type, tvb, offset + NB_CALL_NAME_TYPE,
 498                 1, TRUE);
 499
 500 }
 501
 502
 503 static guint8 nb_local_session( tvbuff_t *tvb, int offset, proto_tree *tree)
 504
 505 {/* add the local session to tree, and return its value */
 506
 507         guint8 local_session = tvb_get_guint8( tvb, offset + NB_LOCAL_SES);
 508
 509         proto_tree_add_uint( tree, hf_netb_local_ses_no, tvb, offset + NB_LOCAL_SES, 1,
 510                 local_session);
 511
 512         return local_session;
 513 }
 514
 515
 516 static guint8 nb_remote_session( tvbuff_t *tvb, int offset, proto_tree *tree)
 517
 518 {/* add the remote session to tree, and return its value */
 519
 520         guint8 remote_session = tvb_get_guint8( tvb, offset + NB_RMT_SES);
 521
 522         proto_tree_add_uint( tree, hf_netb_remote_ses_no, tvb, offset + NB_RMT_SES, 1,
 523                 remote_session);
 524
 525         return remote_session;
 526 }
 527
 528
 529 static void nb_data1(int hf, tvbuff_t *tvb, int offset, proto_tree *tree)
 530
 531 {/* add the DATA1 to tree with specified hf_ value */
 532
 533         proto_tree_add_item( tree, hf, tvb, offset + NB_DATA1, 1, TRUE);
 534
 535 }
 536
 537
 538 static void nb_data2(int hf, tvbuff_t *tvb, int offset, proto_tree *tree)
 539
 540 {/* add the DATA2 to tree with specified hf_ value */
 541
 542         proto_tree_add_item( tree, hf, tvb, offset + NB_DATA2, 2, TRUE);
 543
 544 }
 545
 546
 547 static void nb_resync_indicator( tvbuff_t *tvb, int offset, proto_tree *tree, char *cmd_str)
 548 {
 549         guint16 resync_indicator = tvb_get_letohs( tvb, offset + NB_DATA2);
 550
 551
 552         switch (resync_indicator) {
 553
 554         case 0x0000:
 555                 proto_tree_add_text(tree, tvb, offset + NB_DATA2, 2,
 556                     "Re-sync indicator: No re-sync");
 557                 break;
 558
 559         case 0x0001:
 560                 proto_tree_add_text(tree, tvb, offset + NB_DATA2, 2,
 561                     "Re-sync indicator: First '%s' following 'Receive Outstanding'", cmd_str);
 562                 break;
 563
 564         default:
 565                 proto_tree_add_text(tree, tvb, offset + NB_DATA2, 2,
 566                     "Re-sync indicator: 0x%04x", resync_indicator);
 567                 break;
 568         }
 569 }
 570
 571 /************************************************************************/
 572 /*                                                                      */
 573 /*  The routines called by the top level to handle individual commands  */
 574 /*                                                                      */
 575 /************************************************************************/
 576
 577 static guint32
 578 dissect_netb_unknown( tvbuff_t *tvb, int offset, proto_tree *tree)
 579
 580 {/* Handle any unknown commands, do nothing */
 581
 582         proto_tree_add_text(tree, tvb, offset + NB_COMMAND + 1, -1,
 583             "Unknown NetBIOS command data");
 584
 585         return 0;
 586 }
 587
 588
 589 static guint32
 590 dissect_netb_add_group_name( tvbuff_t *tvb, int offset, proto_tree *tree)
 591
 592 {/* Handle the ADD GROUP NAME QUERY command */
 593
 594         nb_resp_corrl( tvb, offset, tree);
 595
 596         netbios_add_name("Group name to add", tvb, offset + NB_SENDER_NAME,
 597             tree);
 598
 599         return 0;
 600 }
 601
 602
 603 static guint32
 604 dissect_netb_add_name( tvbuff_t *tvb, int offset, proto_tree *tree)
 605
 606 {/* Handle the ADD NAME QUERY command */
 607
 608         nb_resp_corrl( tvb, offset, tree);
 609
 610         netbios_add_name("Name to add", tvb, offset + NB_SENDER_NAME, tree);
 611
 612         return 0;
 613 }
 614
 615
 616 static guint32
 617 dissect_netb_name_in_conflict( tvbuff_t *tvb, int offset, proto_tree *tree)
 618
 619 {/* Handle the NAME IN CONFLICT command */
 620
 621         netbios_add_name("Name In Conflict", tvb, offset + NB_RECVER_NAME,
 622             tree);
 623         netbios_add_name("Sender's Name", tvb, offset + NB_SENDER_NAME, tree);
 624
 625         return 0;
 626 }
 627
 628
 629 static guint32
 630 dissect_netb_status_query( tvbuff_t *tvb, int offset, proto_tree *tree)
 631
 632 {/* Handle the STATUS QUERY command */
 633
 634         guint8 status_request = tvb_get_guint8( tvb, offset + NB_DATA1);
 635
 636         switch (status_request) {
 637
 638         case 0:
 639                 proto_tree_add_text(tree, tvb, offset + NB_DATA1, 1,
 640                     "Status request: NetBIOS 1.x or 2.0");
 641                 break;
 642
 643         case 1:
 644                 proto_tree_add_text(tree, tvb, offset + NB_DATA1, 1,
 645                     "Status request: NetBIOS 2.1, initial status request");
 646                 break;
 647
 648         default:
 649                 proto_tree_add_text(tree, tvb, offset + NB_DATA1, 1,
 650                     "Status request: NetBIOS 2.1, %u names received so far",
 651                     status_request);
 652                 break;
 653         }
 654         nb_data2( hf_netb_status_buffer_len, tvb, offset, tree);
 655         nb_resp_corrl( tvb, offset, tree);
 656         netbios_add_name("Receiver's Name", tvb, offset + NB_RECVER_NAME, tree);
 657         netbios_add_name("Sender's Name", tvb, offset + NB_SENDER_NAME, tree);
 658
 659         return 0;
 660 }
 661
 662
 663 static guint32
 664 dissect_netb_terminate_trace( tvbuff_t *tvb _U_, int offset _U_, proto_tree *tree _U_)
 665
 666 {/* Handle the TERMINATE TRACE command */
 667
 668         /*
 669          * XXX - are any of the fields in this message significant?
 670          * The IBM NetBIOS document shows them as "Reserved".
 671          */
 672
 673         return 0;
 674 }
 675
 676
 677 static guchar zeroes[10];
 678
 679 static guint32
 680 dissect_netb_datagram( tvbuff_t *tvb, int offset, proto_tree *tree)
 681
 682 {/* Handle the DATAGRAM command */
 683
 684         netbios_add_name("Receiver's Name", tvb, offset + NB_RECVER_NAME, tree);
 685         /* Weird.  In some datagrams, this is 10 octets of 0, followed
 686            by a MAC address.... */
 687
 688         if (memcmp( tvb_get_ptr( tvb,offset + NB_SENDER_NAME, 10), zeroes, 10) == 0) {
 689                 proto_tree_add_text( tree, tvb, offset + NB_SENDER_NAME + 10, 6,
 690                     "Sender's MAC Address: %s",
 691                     ether_to_str( tvb_get_ptr( tvb,offset + NB_SENDER_NAME + 10, 6)));
 692         } else {
 693                 netbios_add_name("Sender's Name", tvb, offset + NB_SENDER_NAME,
 694                     tree);
 695         }
 696
 697         return 0;
 698 }
 699
 700
 701 static guint32
 702 dissect_netb_datagram_bcast( tvbuff_t *tvb, int offset, proto_tree *tree)
 703
 704 {/* Handle the DATAGRAM BROADCAST command */
 705
 706         /* We assume the same weirdness can happen here.... */
 707         if ( memcmp( tvb_get_ptr( tvb,offset + NB_SENDER_NAME + 10, 6), zeroes, 10) == 0) {
 708                 proto_tree_add_text( tree, tvb, offset + NB_SENDER_NAME + 10, 6,
 709                     "Sender's Node Address: %s",
 710                     ether_to_str( tvb_get_ptr( tvb,offset + NB_SENDER_NAME + 10, 6)));
 711         } else {
 712                 netbios_add_name("Sender's Name", tvb, offset + NB_SENDER_NAME,
 713                     tree);
 714         }
 715
 716         return 0;
 717 }
 718
 719
 720 static guint32
 721 dissect_netb_name_query( tvbuff_t *tvb, int offset, proto_tree *tree)
 722
 723 {/* Handle the NAME QUERY command */
 724         guint8 local_session_number = tvb_get_guint8( tvb, offset + NB_DATA2);
 725
 726         if (local_session_number == 0) {
 727                 proto_tree_add_text( tree, tvb, offset + NB_DATA2, 1,
 728                     "Local Session No.: 0 (FIND.NAME request)");
 729         } else {
 730                 proto_tree_add_text( tree, tvb, offset + NB_DATA2, 1,
 731                     "Local Session No.: 0x%02x", local_session_number);
 732         }
 733         nb_call_name_type( tvb, offset, tree);
 734         nb_resp_corrl( tvb, offset, tree);
 735         netbios_add_name("Query Name", tvb, offset + NB_RECVER_NAME, tree);
 736         if (local_session_number != 0) {
 737                 netbios_add_name("Sender's Name", tvb, offset + NB_SENDER_NAME,
 738                     tree);
 739         }
 740
 741         return 0;
 742 }
 743
 744
 745 static guint32
 746 dissect_netb_add_name_resp( tvbuff_t *tvb, int offset, proto_tree *tree)
 747
 748 {/* Handle the ADD NAME RESPONSE command */
 749
 750         nb_data1( hf_netb_status, tvb, offset, tree);
 751         nb_data2( hf_netb_name_type, tvb, offset, tree);
 752         nb_xmit_corrl( tvb, offset, tree);
 753         netbios_add_name("Name to be added", tvb, offset + NB_RECVER_NAME,
 754             tree);
 755         netbios_add_name("Name to be added", tvb, offset + NB_SENDER_NAME,
 756             tree);
 757
 758         return 0;
 759 }
 760
 761
 762 static guint32
 763 dissect_netb_name_resp( tvbuff_t *tvb, int offset, proto_tree *tree)
 764
 765 {/* Handle the NAME RECOGNIZED command */
 766         guint8 local_session_number = tvb_get_guint8( tvb, offset + NB_DATA2);
 767
 768         switch (local_session_number) {
 769
 770         case 0x00:
 771                 proto_tree_add_text( tree, tvb, offset + NB_DATA2, 1,
 772                     "State of name: No LISTEN pending, or FIND.NAME response");
 773                 break;
 774
 775         case 0xFF:
 776                 proto_tree_add_text( tree, tvb, offset + NB_DATA2, 1,
 777                     "State of name: LISTEN pending, but insufficient resources to establish session");
 778                 break;
 779
 780         default:
 781                 proto_tree_add_text( tree, tvb, offset + NB_DATA2, 1,
 782                     "Local Session No.: 0x%02x", local_session_number);
 783                 break;
 784         }
 785         nb_call_name_type( tvb, offset, tree);
 786         nb_xmit_corrl( tvb, offset, tree);
 787         if (local_session_number != 0x00 && local_session_number != 0xFF)
 788                 nb_resp_corrl(tvb, offset, tree);
 789         netbios_add_name("Receiver's Name", tvb, offset + NB_RECVER_NAME, tree);
 790         if (local_session_number != 0x00 && local_session_number != 0xFF) {
 791                 netbios_add_name("Sender's Name", tvb, offset + NB_SENDER_NAME,
 792                     tree);
 793         }
 794
 795         return 0;
 796 }
 797
 798
 799 static guint32
 800 dissect_netb_status_resp( tvbuff_t *tvb, int offset, proto_tree *tree)
 801
 802 {/* Handle the STATUS RESPONSE command */
 803         guint8 status_response = tvb_get_guint8( tvb, offset + NB_DATA1);
 804         proto_item *td2;
 805         proto_tree *data2_tree;
 806         guint16 data2;
 807
 808         nb_call_name_type( tvb, offset, tree);
 809         if (status_response == 0) {
 810                 proto_tree_add_text(tree, tvb, offset + NB_DATA1, 1,
 811                     "Status response: NetBIOS 1.x or 2.0");
 812         } else {
 813                 proto_tree_add_text(tree, tvb, offset + NB_DATA1, 1,
 814                     "Status response: NetBIOS 2.1, %u names sent so far",
 815                     status_response);
 816         }
 817         data2 = tvb_get_letohs( tvb, offset + NB_DATA2);
 818
 819         td2 = proto_tree_add_text(tree, tvb, offset + NB_DATA2, 2, "Status: 0x%04x",
 820             data2);
 821         data2_tree = proto_item_add_subtree(td2, ett_netb_status);
 822         if (data2 & 0x8000) {
 823                 proto_tree_add_text(data2_tree, tvb, offset, 2, "%s",
 824                     decode_boolean_bitfield(data2, 0x8000, 8*2,
 825                         "Data length exceeds maximum frame size", NULL));
 826         }
 827         if (data2 & 0x4000) {
 828                 proto_tree_add_text(data2_tree, tvb, offset, 2, "%s",
 829                     decode_boolean_bitfield(data2, 0x4000, 8*2,
 830                         "Data length exceeds user's buffer", NULL));
 831         }
 832         proto_tree_add_text(data2_tree, tvb, offset, 2, "%s",
 833             decode_numeric_bitfield(data2, 0x3FFF, 2*8,
 834                         "Status data length = %u"));
 835         nb_xmit_corrl( tvb, offset, tree);
 836         netbios_add_name("Receiver's Name", tvb, offset + NB_RECVER_NAME, tree);
 837         netbios_add_name("Sender's Name", tvb, offset + NB_SENDER_NAME,
 838             tree);
 839
 840         return 0;
 841 }
 842
 843
 844 static guint32
 845 dissect_netb_data_ack( tvbuff_t* tvb, int offset, proto_tree *tree)
 846
 847 {/* Handle the DATA ACK command */
 848
 849         nb_xmit_corrl( tvb, offset, tree);
 850         nb_remote_session( tvb, offset, tree);
 851         nb_local_session( tvb, offset, tree);
 852
 853         return 0;
 854 }
 855
 856
 857 static guint32
 858 dissect_netb_data_first_middle( tvbuff_t *tvb, int offset, proto_tree *tree)
 859
 860 {/* Handle the DATA FIRST MIDDLE command */
 861
 862         guint8 remote_session, local_session;
 863
 864         /*
 865          * This is the first frame, or the middle frame, of a fragmented
 866          * packet.
 867          *
 868          * XXX - there are no sequence numbers, so we have to assume
 869          * that fragments arrive in order with no duplicates.
 870          * In fact, 802.2 LLC is supposed to handle that, so we
 871          * might have to have the LLC dissector do so (but the TCP
 872          * dissector doesn't currently handle out-of-order or duplicate
 873          * data, either).
 874          */
 875
 876         netbios_data_first_middle_flags( tvb, tree, offset + NB_FLAGS);
 877
 878         nb_resync_indicator( tvb, offset, tree, "DATA FIRST MIDDLE");
 879         nb_xmit_corrl( tvb, offset, tree);
 880         nb_resp_corrl( tvb, offset, tree);
 881         remote_session = nb_remote_session( tvb, offset, tree);
 882         local_session = nb_local_session( tvb, offset, tree);
 883
 884         /*
 885          * Return a combination of the remote and local session numbers,
 886          * for use when reassembling.
 887          */
 888         return (remote_session << 8) + local_session;
 889 }
 890
 891
 892 static guint32
 893 dissect_netb_data_only_last( tvbuff_t *tvb, int offset, proto_tree *tree)
 894
 895 {/* Handle the DATA ONLY LAST command */
 896
 897         guint8 remote_session, local_session;
 898
 899         /*
 900          * This is a complete packet, or the last frame of a fragmented
 901          * packet.
 902          */
 903
 904         netbios_data_only_flags( tvb, tree, offset + NB_FLAGS);
 905
 906         nb_resync_indicator( tvb, offset, tree, "DATA ONLY LAST");
 907         nb_xmit_corrl( tvb, offset, tree);
 908         nb_resp_corrl( tvb, offset, tree);
 909         remote_session = nb_remote_session( tvb, offset, tree);
 910         local_session = nb_local_session( tvb, offset, tree);
 911
 912         /*
 913          * Return a combination of the remote and local session numbers,
 914          * for use when reassembling.
 915          */
 916         return (remote_session << 8) + local_session;
 917 }
 918
 919
 920 static guint32
 921 dissect_netb_session_confirm( tvbuff_t *tvb, int offset, proto_tree *tree)
 922
 923 {/* Handle the SESSION CONFIRM command */
 924
 925         netbios_add_ses_confirm_flags( tvb, tree, offset + NB_FLAGS);
 926
 927         nb_data2( hf_netb_max_data_recv_size, tvb, offset, tree);
 928         nb_xmit_corrl( tvb, offset, tree);
 929         nb_resp_corrl( tvb, offset, tree);
 930         nb_remote_session( tvb, offset, tree);
 931         nb_local_session( tvb, offset, tree);
 932
 933         return 0;
 934 }
 935
 936
 937 static guint32
 938 dissect_netb_session_end( tvbuff_t *tvb, int offset, proto_tree *tree)
 939
 940 {/* Handle the SESSION END command */
 941
 942         nb_data2( hf_netb_termination_indicator, tvb, offset, tree);
 943         nb_remote_session( tvb, offset, tree);
 944         nb_local_session( tvb, offset, tree);
 945
 946         return 0;
 947 }
 948
 949
 950 static guint32
 951 dissect_netb_session_init( tvbuff_t *tvb, int offset, proto_tree *tree)
 952
 953 {/* Handle the SESSION INITIALIZE command */
 954
 955         netbios_add_session_init_flags( tvb, tree, offset + NB_FLAGS);
 956
 957         nb_data2( hf_netb_max_data_recv_size, tvb, offset, tree);
 958         nb_resp_corrl( tvb, offset, tree);
 959         nb_xmit_corrl( tvb, offset, tree);
 960         nb_remote_session( tvb, offset, tree);
 961         nb_local_session( tvb, offset, tree);
 962
 963         return 0;
 964 }
 965
 966 static guint32
 967 dissect_netb_no_receive( tvbuff_t *tvb, int offset, proto_tree *tree)
 968
 969 {/* Handle the NO RECEIVE command */
 970
 971         netbios_no_receive_flags( tvb, tree, offset + NB_FLAGS);
 972
 973         nb_data2( hf_netb_num_data_bytes_accepted, tvb, offset, tree);
 974         nb_remote_session( tvb, offset, tree);
 975         nb_local_session( tvb, offset, tree);
 976
 977         return 0;
 978 }
 979
 980
 981 static guint32
 982 dissect_netb_receive_outstanding( tvbuff_t *tvb, int offset, proto_tree *tree)
 983
 984 {/* Handle the RECEIVE OUTSTANDING command */
 985
 986         nb_data2( hf_netb_num_data_bytes_accepted, tvb, offset, tree);
 987         nb_remote_session( tvb, offset, tree);
 988         nb_local_session( tvb, offset, tree);
 989
 990         return 0;
 991 }
 992
 993
 994 static guint32
 995 dissect_netb_receive_continue( tvbuff_t *tvb, int offset, proto_tree *tree)
 996
 997 {/* Handle the RECEIVE CONTINUE command */
 998
 999         nb_xmit_corrl( tvb, offset, tree);
1000         nb_remote_session( tvb, offset, tree);
1001         nb_local_session( tvb, offset, tree);
1002
1003         return 0;
1004 }
1005
1006
1007 static guint32
1008 dissect_netb_session_alive( tvbuff_t *tvb, int offset, proto_tree *tree)
1009
1010 {/* Handle the SESSION ALIVE command */
1011
1012         /*
1013          * XXX - all the fields are claimed to be "Reserved", but
1014          * the session numbers appear to be non-zero in at least
1015          * one capture, and they do appear to match session numbers
1016          * in other messages, and I'd expect that you had to identify
1017          * sessions in this message in any case.
1018          *
1019          * We show only those fields.
1020          */
1021         nb_remote_session( tvb, offset, tree);
1022         nb_local_session( tvb, offset, tree);
1023
1024         return 0;
1025 }
1026
1027
1028 /************************************************************************/
1029 /*                                                                      */
1030 /*  The table routines called by the top level to handle commands       */
1031 /*                                                                      */
1032 /************************************************************************/
1033
1034
1035 static guint32 (*dissect_netb[])(tvbuff_t *, int, proto_tree *) = {
1036
1037   dissect_netb_add_group_name,  /* Add Group Name       0x00 */
1038   dissect_netb_add_name,        /* Add Name             0x01 */
1039   dissect_netb_name_in_conflict,/* Name In Conflict     0x02 */
1040   dissect_netb_status_query,    /* Status Query         0x03 */
1041   dissect_netb_unknown,         /* unknown              0x04 */
1042   dissect_netb_unknown,         /* unknown              0x05 */
1043   dissect_netb_unknown,         /* unknown              0x06 */
1044   dissect_netb_terminate_trace, /* Terminate Trace      0x07 */
1045   dissect_netb_datagram,        /* Datagram             0x08 */
1046   dissect_netb_datagram_bcast,  /* Datagram Broadcast   0x09 */
1047   dissect_netb_name_query,      /* Name Query           0x0A */
1048   dissect_netb_unknown,         /* unknown              0x0B */
1049   dissect_netb_unknown,         /* unknown              0x0C */
1050   dissect_netb_add_name_resp,   /* Add Name Response    0x0D */
1051   dissect_netb_name_resp,       /* Name Recognized      0x0E */
1052   dissect_netb_status_resp,     /* Status Response      0x0F */
1053   dissect_netb_unknown,         /* unknown              0x10 */
1054   dissect_netb_unknown,         /* unknown              0x11 */
1055   dissect_netb_unknown,         /* unknown              0x12 */
1056   dissect_netb_terminate_trace, /* Terminate Trace      0x13 */
1057   dissect_netb_data_ack,        /* Data Ack             0x14 */
1058   dissect_netb_data_first_middle,/* Data First Middle   0x15 */
1059   dissect_netb_data_only_last,  /* Data Only Last       0x16 */
1060   dissect_netb_session_confirm, /* Session Confirm      0x17 */
1061   dissect_netb_session_end,     /* Session End          0x18 */
1062   dissect_netb_session_init,    /* Session Initialize   0x19 */
1063   dissect_netb_no_receive,      /* No Receive           0x1A */
1064   dissect_netb_receive_outstanding,/* Receive Outstanding 0x1B */
1065   dissect_netb_receive_continue,/* Receive Continue     0x1C */
1066   dissect_netb_unknown,         /* unknown              0x1D */
1067   dissect_netb_unknown,         /* unknown              0x1E */
1068   dissect_netb_session_alive,   /* Session Alive        0x1f */
1069   dissect_netb_unknown,
1070 };
1071
1072 static heur_dissector_list_t netbios_heur_subdissector_list;
1073
1074 void
1075 dissect_netbios_payload(tvbuff_t *tvb, packet_info *pinfo, proto_tree *tree)
1076 {
1077         /*
1078          * Try the heuristic dissectors for NetBIOS; if none of them
1079          * accept the packet, dissect it as data.
1080          */
1081         if (!dissector_try_heuristic(netbios_heur_subdissector_list,
1082                                     tvb, pinfo, tree))
1083                 call_dissector(data_handle,tvb, pinfo, tree);
1084 }
1085
1086 static void
1087 dissect_netbios(tvbuff_t *tvb, packet_info *pinfo, proto_tree *tree)
1088
1089 {
1090         proto_tree              *netb_tree = NULL;
1091         proto_item              *ti;
1092         guint16                 hdr_len, command;
1093         char                    *command_name;
1094         char                    name[(NETBIOS_NAME_LEN - 1)*4 + 1];
1095         int                     name_type;
1096         guint16                 session_id;
1097         gboolean                save_fragmented;
1098         int                     len;
1099         fragment_data           *fd_head;
1100         tvbuff_t                *next_tvb;
1101
1102         int offset = 0;
1103
1104                                         /* load the display labels      */
1105         if (check_col(pinfo->cinfo, COL_PROTOCOL))
1106                 col_set_str(pinfo->cinfo, COL_PROTOCOL, "NetBIOS");
1107
1108
1109 /* Find NetBIOS marker EFFF, this is done because I have seen an extra LLC */
1110 /* byte on our network. This only checks for one extra LLC byte. */
1111
1112         if ( 0xefff != tvb_get_letohs(tvb, 2)){
1113                 ++offset;
1114                 if ( 0xefff != tvb_get_letohs(tvb, 3)){
1115
1116                         if (check_col( pinfo->cinfo, COL_INFO))         /* print bad packet */
1117                                 col_set_str( pinfo->cinfo, COL_INFO, "Bad packet, no 0xEFFF marker");
1118
1119                         return;         /* this is an unknow packet, no marker */
1120                 }
1121         }
1122
1123
1124         hdr_len = tvb_get_letohs(tvb, offset + NB_LENGTH);
1125         command = tvb_get_guint8( tvb, offset + NB_COMMAND);
1126                                         /* limit command so no table overflows */
1127         command = MIN( command, sizeof( dissect_netb)/ sizeof(void *));
1128
1129         if (check_col( pinfo->cinfo, COL_INFO)) {              /* print command name */
1130                 command_name = val_to_str(command, cmd_vals, "Unknown (0x%02x)");
1131                 switch ( command ) {
1132                 case NB_NAME_QUERY:
1133                         name_type = get_netbios_name( tvb, offset + 12, name);
1134                         col_add_fstr( pinfo->cinfo, COL_INFO, "%s for %s<%02x>",
1135                             command_name, name, name_type);
1136                         break;
1137
1138                 case NB_NAME_RESP:
1139                 case NB_ADD_NAME:
1140                 case NB_ADD_GROUP:
1141                         name_type = get_netbios_name( tvb, offset + 28, name);
1142                         col_add_fstr( pinfo->cinfo, COL_INFO, "%s - %s<%02x>",
1143                             command_name, name, name_type);
1144                         break;
1145
1146                 default:
1147                         col_add_fstr( pinfo->cinfo, COL_INFO, "%s",
1148                             command_name);
1149                         break;
1150                 }
1151         }
1152
1153         if ( tree) {
1154                 ti = proto_tree_add_item(tree, proto_netbios, tvb, 0, hdr_len, FALSE);
1155                 netb_tree = proto_item_add_subtree(ti, ett_netb);
1156
1157                 proto_tree_add_uint_format(netb_tree, hf_netb_hdr_len, tvb, offset, 2, hdr_len,
1158                         "Length: %d bytes", hdr_len);
1159
1160                 proto_tree_add_text(netb_tree, tvb, offset + 2, 2,
1161                         "Delimiter: EFFF (NetBIOS)");
1162
1163                 proto_tree_add_uint(netb_tree, hf_netb_cmd, tvb, offset + NB_COMMAND, 1, command);
1164         }
1165
1166                                         /* if command in table range */
1167         if ( command < sizeof( dissect_netb)/ sizeof(void *)) {
1168
1169                                         /* branch to handle commands */
1170                 session_id = (dissect_netb[ command])( tvb, offset, netb_tree);
1171
1172                 offset += hdr_len;                      /* move past header */
1173
1174                 save_fragmented = pinfo->fragmented;
1175
1176                 /*
1177                  * Process user data in frames that have it.
1178                  */
1179                 switch (command) {
1180
1181                 case NB_DATAGRAM:
1182                 case NB_DATAGRAM_BCAST:
1183                         /*
1184                          * No fragmentation here.
1185                          */
1186                         next_tvb = tvb_new_subset(tvb, offset, -1, -1);
1187                         dissect_netbios_payload(next_tvb, pinfo, tree);
1188                         break;
1189
1190                 case NB_DATA_FIRST_MIDDLE:
1191                 case NB_DATA_ONLY_LAST:
1192                         /*
1193                          * Possibly fragmented.
1194                          */
1195                         len = tvb_reported_length_remaining(tvb, offset);
1196                         if (netbios_defragment &&
1197                             tvb_bytes_exist(tvb, offset, len)) {
1198                                 fd_head = fragment_add_seq_next(tvb, offset,
1199                                     pinfo, session_id,
1200                                     netbios_fragment_table,
1201                                     netbios_reassembled_table,
1202                                     len, command == NB_DATA_FIRST_MIDDLE);
1203                                 if (fd_head != NULL) {
1204                                         if (fd_head->next != NULL) {
1205                                                 next_tvb = tvb_new_real_data(fd_head->data,
1206                                                     fd_head->len, fd_head->len);
1207                                                 tvb_set_child_real_data_tvbuff(tvb,
1208                                                     next_tvb);
1209                                                 add_new_data_source(pinfo,
1210                                                     next_tvb,
1211                                                     "Reassembled NetBIOS");
1212                                                 /* Show all fragments. */
1213                                                 if (tree) {
1214                                                         show_fragment_seq_tree(fd_head,
1215                                                             &netbios_frag_items,
1216                                                             netb_tree, pinfo,
1217                                                             next_tvb);
1218                                                 }
1219                                         } else {
1220                                                 next_tvb = tvb_new_subset(tvb,
1221                                                     offset, -1, -1);
1222                                         }
1223                                 } else {
1224                                         next_tvb = NULL;
1225                                 }
1226                         } else {
1227                                 /*
1228                                  * Dissect this, regardless of whether
1229                                  * it's NB_DATA_FIRST_MIDDLE or
1230                                  * NB_DATA_ONLY_LAST.
1231                                  *
1232                                  * XXX - it'd be nice to show
1233                                  * NB_DATA_FIRST_MIDDLE as a fragment
1234                                  * if it's not the first fragment (i.e.,
1235                                  * MIDDLE rather than FIRST), and show
1236                                  * NB_DATA_ONLY_LAST as a fragment if
1237                                  * it's part of a fragmented datagram
1238                                  * (i.e, LAST rather than ONLY), but
1239                                  * we'd have to do reassembly to
1240                                  * be able to determine that.
1241                                  */
1242                                 next_tvb = tvb_new_subset(tvb, offset, -1, -1);
1243                         }
1244                         if (next_tvb != NULL)
1245                                 dissect_netbios_payload(next_tvb, pinfo, tree);
1246                         else {
1247                                 next_tvb = tvb_new_subset (tvb, offset, -1, -1);
1248                                 call_dissector(data_handle, next_tvb, pinfo,
1249                                     tree);
1250                         }
1251                         break;
1252                 }
1253         }
1254 }
1255
1256 static void
1257 netbios_init(void)
1258 {
1259         /*
1260          * Initialize the fragment and reassembly tables.
1261          */
1262         fragment_table_init(&netbios_fragment_table);
1263         reassembled_table_init(&netbios_reassembled_table);
1264 }
1265
1266 void proto_register_netbios(void)
1267 {
1268         static gint *ett[] = {
1269                 &ett_netb,
1270                 &ett_netb_name,
1271                 &ett_netb_flags,
1272                 &ett_netb_status,
1273                 &ett_netb_fragments,
1274                 &ett_netb_fragment,
1275         };
1276
1277         static hf_register_info hf_netb[] = {
1278                 { &hf_netb_cmd,
1279                 { "Command", "netbios.command", FT_UINT8, BASE_HEX, VALS(cmd_vals), 0x0,
1280                         "", HFILL }},
1281
1282                 { &hf_netb_hdr_len,
1283                 { "Header Length", "netbios.hdr_len", FT_UINT16, BASE_DEC, NULL, 0x0,
1284                         "", HFILL }},
1285
1286                 { &hf_netb_xmit_corrl,
1287                 { "Transmit Correlator", "netbios.xmit_corrl", FT_UINT16, BASE_HEX, NULL, 0x0,
1288                         "", HFILL }},
1289
1290                 { &hf_netb_resp_corrl,
1291                 { "Response Correlator", "netbios.resp_corrl", FT_UINT16, BASE_HEX, NULL, 0x0,
1292                         "", HFILL }},
1293
1294                 { &hf_netb_call_name_type,
1295                 { "Caller's Name Type", "netbios.call_name_type", FT_UINT8, BASE_HEX, VALS(name_types), 0x0,
1296                         "", HFILL }},
1297
1298                 { &hf_netb_nb_name_type,
1299                 { "NetBIOS Name Type", "netbios.nb_name_type", FT_UINT8, BASE_HEX, VALS(nb_name_type_vals), 0x0,
1300                         "", HFILL }},
1301
1302                 { &hf_netb_nb_name,
1303                 { "NetBIOS Name", "netbios.nb_name", FT_STRING, BASE_NONE, NULL, 0x0,
1304                         "", HFILL }},
1305
1306                 { &hf_netb_ack,
1307                 { "Acknowledge", "netbios.ack", FT_BOOLEAN, 8, TFS( &flags_set), 0x08,
1308                         "", HFILL }},
1309
1310                 { &hf_netb_ack_with_data,
1311                 { "Acknowledge with data", "netbios.ack_with_data", FT_BOOLEAN, 8, TFS( &flags_allowed), 0x04,
1312                         "", HFILL }},
1313
1314                 { &hf_netb_ack_expected,
1315                 { "Acknowledge expected", "netbios.ack_expected", FT_BOOLEAN,  8,
1316                         TFS( &flags_yes_no), 0x02, "", HFILL }},
1317
1318                 { &hf_netb_recv_cont_req,
1319                 { "RECEIVE_CONTINUE requested", "netbios.recv_cont_req", FT_BOOLEAN,  8,
1320                         TFS( &flags_yes_no), 0x01, "", HFILL }},
1321
1322                 { &hf_netb_send_no_ack,
1323                 { "Handle SEND.NO.ACK", "netbios.send_no_ack", FT_BOOLEAN,  8,
1324                         TFS( &flags_yes_no), 0x80, "", HFILL }},
1325
1326                 { &hf_netb_version,
1327                 { "NetBIOS Version", "netbios.version", FT_BOOLEAN,  8,
1328                         TFS( &netb_version_str), 0x01, "", HFILL }},
1329
1330                 { &hf_netb_largest_frame,
1331                 { "Largest Frame", "netbios.largest_frame", FT_UINT8, BASE_DEC, VALS(max_frame_size_vals), 0x0E,
1332                         "", HFILL }},
1333
1334                 { &hf_netb_status_buffer_len,
1335                 { "Length of status buffer", "netbios.status_buffer_len", FT_UINT16, BASE_DEC, NULL, 0x0,
1336                         "", HFILL }},
1337
1338                 { &hf_netb_status,
1339                 { "Status", "netbios.status", FT_UINT8, BASE_DEC, VALS(status_vals), 0x0,
1340                         "", HFILL }},
1341
1342                 { &hf_netb_name_type,
1343                 { "Name type", "netbios.name_type", FT_UINT16, BASE_DEC, VALS(name_types), 0x0,
1344                         "", HFILL }},
1345
1346                 { &hf_netb_max_data_recv_size,
1347                 { "Maximum data receive size", "netbios.max_data_recv_size", FT_UINT16, BASE_DEC, NULL, 0x0,
1348                         "", HFILL }},
1349
1350                 { &hf_netb_termination_indicator,
1351                 { "Termination indicator", "netbios.termination_indicator", FT_UINT16, BASE_HEX, VALS(termination_indicator_vals), 0x0,
1352                         "", HFILL }},
1353
1354                 { &hf_netb_num_data_bytes_accepted,
1355                 { "Number of data bytes accepted", "netbios.num_data_bytes_accepted", FT_UINT16, BASE_DEC, NULL, 0x0,
1356                         "", HFILL }},
1357
1358                 { &hf_netb_local_ses_no,
1359                 { "Local Session No.", "netbios.local_session", FT_UINT8, BASE_HEX, NULL, 0x0,
1360                         "", HFILL }},
1361
1362                 { &hf_netb_remote_ses_no,
1363                 { "Remote Session No.", "netbios.remote_session", FT_UINT8, BASE_HEX, NULL, 0x0,
1364                         "", HFILL }},
1365
1366                 { &hf_netb_data1,
1367                 { "DATA1 value", "netbios.data1", FT_UINT8, BASE_HEX, NULL, 0x0,
1368                         "", HFILL }},
1369
1370                 { &hf_netb_data2,
1371                 { "DATA2 value", "netbios.data2", FT_UINT16, BASE_HEX, NULL, 0x0,
1372                         "", HFILL }},
1373
1374                 { &hf_netb_fragment_overlap,
1375                 { "Fragment overlap",   "netbios.fragment.overlap", FT_BOOLEAN, BASE_NONE,
1376                         NULL, 0x0, "Fragment overlaps with other fragments", HFILL }},
1377
1378                 { &hf_netb_fragment_overlap_conflict,
1379                 { "Conflicting data in fragment overlap", "netbios.fragment.overlap.conflict",
1380                         FT_BOOLEAN, BASE_NONE,
1381                         NULL, 0x0, "Overlapping fragments contained conflicting data", HFILL }},
1382
1383                 { &hf_netb_fragment_multiple_tails,
1384                 { "Multiple tail fragments found", "netbios.fragment.multipletails",
1385                         FT_BOOLEAN, BASE_NONE,
1386                         NULL, 0x0, "Several tails were found when defragmenting the packet", HFILL }},
1387
1388                 { &hf_netb_fragment_too_long_fragment,
1389                 { "Fragment too long",  "netbios.fragment.toolongfragment", FT_BOOLEAN, BASE_NONE,
1390                         NULL, 0x0, "Fragment contained data past end of packet", HFILL }},
1391
1392                 { &hf_netb_fragment_error,
1393                 {"Defragmentation error",       "netbios.fragment.error", FT_FRAMENUM, BASE_NONE,
1394                         NULL, 0x0, "Defragmentation error due to illegal fragments", HFILL }},
1395
1396                 { &hf_netb_fragment,
1397                 { "NetBIOS Fragment",           "netbios.fragment", FT_FRAMENUM, BASE_NONE,
1398                         NULL, 0x0, "NetBIOS Fragment", HFILL }},
1399
1400                 { &hf_netb_fragments,
1401                 { "NetBIOS Fragments",  "netbios.fragments", FT_NONE, BASE_NONE,
1402                         NULL, 0x0, "NetBIOS Fragments", HFILL }},
1403         };
1404         module_t *netbios_module;
1405
1406         proto_netbios = proto_register_protocol("NetBIOS", "NetBIOS", "netbios");
1407         proto_register_subtree_array(ett, array_length(ett));
1408         proto_register_field_array(proto_netbios, hf_netb, array_length(hf_netb));
1409
1410         register_heur_dissector_list("netbios", &netbios_heur_subdissector_list);
1411
1412         netbios_module = prefs_register_protocol(proto_netbios, NULL);
1413         prefs_register_bool_preference(netbios_module, "defragment",
1414             "Defragment all NetBIOS messages spanning multiple frames",
1415             "Whether the NetBIOS dissector should defragment all messages spanning multiple frames",
1416             &netbios_defragment);
1417
1418         register_init_routine(netbios_init);
1419 }
1420
1421 void
1422 proto_reg_handoff_netbios(void)
1423 {
1424         dissector_handle_t netbios_handle;
1425
1426         netbios_handle = create_dissector_handle(dissect_netbios,
1427             proto_netbios);
1428         dissector_add("llc.dsap", SAP_NETBIOS, netbios_handle);
1429         data_handle = find_dissector("data");
1430 }