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 1.55 2002/12/19 11:22:33 sahlberg 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         "fragments"
 135 };
 136
 137 static dissector_handle_t data_handle;
 138
 139 /* The strings for the station type, used by get_netbios_name function;
 140    many of them came from the file "NetBIOS.txt" in the Zip archive at
 141
 142         http://www.net3group.com/ftp/browser.zip
 143  */
 144
 145 static const value_string nb_name_type_vals[] = {
 146         {0x00,  "Workstation/Redirector"},
 147         {0x01,  "Browser"},
 148         {0x02,  "Workstation/Redirector"},
 149                 /* not sure what 0x02 is, I'm seeing alot of them however */
 150                 /* i'm seeing them with workstation/redirection host
 151                         announcements */
 152         {0x03,  "Messenger service/Main name"},
 153         {0x05,  "Forwarded name"},
 154         {0x06,  "RAS Server service"},
 155         {0x1b,  "Domain Master Browser"},
 156         {0x1c,  "Domain Controllers"},
 157         {0x1d,  "Local Master Browser"},
 158         {0x1e,  "Browser Election Service"},
 159         {0x1f,  "Net DDE Service"},
 160         {0x20,  "Server service"},
 161         {0x21,  "RAS client service"},
 162         {0x22,  "Exchange Interchange (MSMail Connector)"},
 163         {0x23,  "Exchange Store"},
 164         {0x24,  "Exchange Directory"},
 165         {0x2b,  "Lotus Notes Server service"},
 166         {0x30,  "Modem sharing server service"},
 167         {0x31,  "Modem sharing client service"},
 168         {0x43,  "SMS Clients Remote Control"},
 169         {0x44,  "SMS Administrators Remote Control Tool"},
 170         {0x45,  "SMS Clients Remote Chat"},
 171         {0x46,  "SMS Clients Remote Transfer"},
 172         {0x4c,  "DEC Pathworks TCP/IP Service on Windows NT"},
 173         {0x52,  "DEC Pathworks TCP/IP Service on Windows NT"},
 174         {0x6a,  "Microsoft Exchange IMC"},
 175         {0x87,  "Microsoft Exchange MTA"},
 176         {0xbe,  "Network Monitor Agent"},
 177         {0xbf,  "Network Monitor Analyzer"},
 178         {0x00,  NULL}
 179 };
 180
 181 /* Tables for reassembly of fragments. */
 182 static GHashTable *netbios_fragment_table = NULL;
 183 static GHashTable *netbios_reassembled_table = NULL;
 184
 185 /* defragmentation of NetBIOS Frame */
 186 static gboolean netbios_defragment = TRUE;
 187
 188 /* See
 189
 190         http://www.s390.ibm.com/bookmgr-cgi/bookmgr.cmd/BOOKS/BK8P7001/CCONTENTS
 191
 192    and
 193
 194         http://ourworld.compuserve.com/homepages/TimothyDEvans/contents.htm
 195
 196    for information about the NetBIOS Frame Protocol (which is what this
 197    module dissects). */
 198
 199 /* the strings for the command types  */
 200
 201 static const value_string cmd_vals[] = {
 202         { NB_ADD_GROUP,                 "Add Group Name Query" },
 203         { NB_ADD_NAME,                  "Add Name Query" },
 204         { NB_NAME_IN_CONFLICT,          "Name In Conflict" },
 205         { NB_STATUS_QUERY,              "Status Query" },
 206         { NB_TERMINATE_TRACE_R,         "Terminate Trace" },
 207         { NB_DATAGRAM,                  "Datagram" },
 208         { NB_DATAGRAM_BCAST,            "Broadcast Datagram" },
 209         { NB_NAME_QUERY,                "Name Query" },
 210         { NB_ADD_NAME_RESP,             "Add Name Response" },
 211         { NB_NAME_RESP,                 "Name Recognized" },
 212         { NB_STATUS_RESP,               "Status Response" },
 213         { NB_TERMINATE_TRACE_LR,        "Terminate Trace" },
 214         { NB_DATA_ACK,                  "Data Ack" },
 215         { NB_DATA_FIRST_MIDDLE,         "Data First Middle" },
 216         { NB_DATA_ONLY_LAST,            "Data Only Last" },
 217         { NB_SESSION_CONFIRM,           "Session Confirm" },
 218         { NB_SESSION_END,               "Session End" },
 219         { NB_SESSION_INIT,              "Session Initialize" },
 220         { NB_NO_RECEIVE,                "No Receive" },
 221         { NB_RECEIVE_OUTSTANDING,       "Receive Outstanding" },
 222         { NB_RECEIVE_CONTINUE,          "Receive Continue" },
 223         { NB_KEEP_ALIVE,                "Session Alive" },
 224         { 0,                            NULL }
 225 };
 226
 227 static const value_string name_types[] = {
 228         { 0, "Unique name" },
 229         { 1, "Group name" },
 230         { 0, NULL }
 231 };
 232
 233 static const true_false_string flags_set = {
 234         "Set",
 235         "Not set"
 236 };
 237 static const true_false_string flags_allowed = {
 238         "Allowed",
 239         "Not allowed"
 240 };
 241 static const true_false_string flags_yes_no = {
 242         "Yes",
 243         "No"
 244 };
 245
 246 static const true_false_string netb_version_str = {
 247         "2.00 or higher",
 248         "1.xx"
 249 };
 250
 251 static const value_string termination_indicator_vals[] = {
 252         { 0x0000, "Normal session end" },
 253         { 0x0001, "Abnormal session end" },
 254         { 0,      NULL }
 255 };
 256
 257 static const value_string status_vals[] = {
 258         { 0, "Add name not in process" },
 259         { 1, "Add name in process" },
 260         { 0, NULL }
 261 };
 262
 263 static const value_string max_frame_size_vals[] = {
 264         { 0,    "516" },
 265         { 1,    "1500" },
 266         { 2,    "2052" },
 267         { 3,    "4472" },
 268         { 4,    "8144" },
 269         { 5,    "11407" },
 270         { 6,    "17800" },      /* 17800 in TR spec, 17749 in NBF spec */
 271         { 7,    "65535" },
 272         { 0,    NULL }
 273 };
 274
 275
 276 void capture_netbios(packet_counts *ld)
 277 {
 278         ld->netbios++;
 279 }
 280
 281
 282 int
 283 process_netbios_name(const guchar *name_ptr, char *name_ret)
 284 {
 285         int i;
 286         int name_type = *(name_ptr + NETBIOS_NAME_LEN - 1);
 287         guchar name_char;
 288         static const char hex_digits[16] = "0123456789abcdef";
 289
 290         for (i = 0; i < NETBIOS_NAME_LEN - 1; i++) {
 291                 name_char = *name_ptr++;
 292                 if (name_char >= ' ' && name_char <= '~')
 293                         *name_ret++ = name_char;
 294                 else {
 295                         /* It's not printable; show it as <XX>, where
 296                            XX is the value in hex. */
 297                         *name_ret++ = '<';
 298                         *name_ret++ = hex_digits[(name_char >> 4)];
 299                         *name_ret++ = hex_digits[(name_char & 0x0F)];
 300                         *name_ret++ = '>';
 301                 }
 302         }
 303         *name_ret = '\0';
 304
 305         /* Remove trailing space characters from name. */
 306
 307         name_ret--;
 308
 309         for (i = 0; i < NETBIOS_NAME_LEN - 1; i++) {
 310                 if (*name_ret != ' ') {
 311                         *(name_ret + 1) = 0;
 312                         break;
 313                 }
 314                 name_ret--;
 315         }
 316
 317         return name_type;
 318 }
 319
 320
 321 int get_netbios_name( tvbuff_t *tvb, int offset, char *name_ret)
 322
 323 {/*  Extract the name string and name type.  Return the name string in  */
 324  /* name_ret and return the name_type. */
 325
 326         return process_netbios_name( tvb_get_ptr( tvb, offset, NETBIOS_NAME_LEN ), name_ret);
 327 }
 328
 329
 330 /*
 331  * Get a string describing the type of a NetBIOS name.
 332  */
 333 char *
 334 netbios_name_type_descr(int name_type)
 335 {
 336         return val_to_str(name_type, nb_name_type_vals, "Unknown");
 337 }
 338
 339 void netbios_add_name(char* label, tvbuff_t *tvb, int offset,
 340     proto_tree *tree)
 341
 342 {/* add a name field display tree. Display the name and station type in sub-tree */
 343
 344         proto_tree *field_tree;
 345         proto_item *tf;
 346         char  name_str[(NETBIOS_NAME_LEN - 1)*4 + 1];
 347         int   name_type;
 348         char  *name_type_str;
 349
 350                                         /* decode the name field */
 351         name_type = get_netbios_name( tvb, offset, name_str);
 352         name_type_str = netbios_name_type_descr(name_type);
 353         tf = proto_tree_add_text( tree, tvb, offset, NETBIOS_NAME_LEN,
 354                 "%s: %s<%02x> (%s)", label, name_str, name_type, name_type_str);
 355
 356         field_tree = proto_item_add_subtree( tf, ett_netb_name);
 357         proto_tree_add_string_format( field_tree, hf_netb_nb_name, tvb, offset,
 358                 15, name_str, "%s", name_str);
 359         proto_tree_add_uint_format( field_tree, hf_netb_nb_name_type, tvb, offset + 15, 1, name_type,
 360             "0x%02x (%s)", name_type, name_type_str);
 361 }
 362
 363
 364 static void netbios_data_first_middle_flags( tvbuff_t *tvb, proto_tree *tree, int offset)
 365
 366 {
 367         proto_tree *field_tree;
 368         proto_item *tf;
 369         guint flags = tvb_get_guint8( tvb, offset);
 370
 371                 /* decode the flag field for Data First Middle packet*/
 372
 373         tf = proto_tree_add_text(tree, tvb, offset, 1,
 374                         "Flags: 0x%02x", flags);
 375         field_tree = proto_item_add_subtree(tf, ett_netb_flags);
 376
 377         proto_tree_add_boolean( field_tree, hf_netb_ack, tvb, offset, 1, flags);
 378
 379         proto_tree_add_boolean( field_tree, hf_netb_ack_expected, tvb, offset, 1, flags);
 380
 381         proto_tree_add_boolean( field_tree, hf_netb_recv_cont_req, tvb, offset, 1, flags);
 382 }
 383
 384 static void netbios_data_only_flags( tvbuff_t *tvb, proto_tree *tree,
 385    int offset)
 386 {
 387         proto_tree *field_tree;
 388         proto_item *tf;
 389         guint flags = tvb_get_guint8( tvb, offset);
 390
 391                 /* decode the flag field for Data Only Last packet*/
 392
 393         tf = proto_tree_add_text(tree, tvb, offset, 1,
 394                         "Flags: 0x%02x", flags);
 395         field_tree = proto_item_add_subtree(tf, ett_netb_flags);
 396
 397         proto_tree_add_boolean( field_tree, hf_netb_ack, tvb, offset, 1, flags);
 398
 399         proto_tree_add_boolean( field_tree, hf_netb_ack_with_data, tvb, offset, 1, flags);
 400
 401         proto_tree_add_boolean( field_tree, hf_netb_ack_expected, tvb, offset, 1, flags);
 402 }
 403
 404
 405
 406 static void netbios_add_ses_confirm_flags( tvbuff_t *tvb, proto_tree *tree,
 407         int offset)
 408 {
 409         proto_tree *field_tree;
 410         proto_item *tf;
 411         guint flags = tvb_get_guint8( tvb, offset);
 412
 413                 /* decode the flag field for Session Confirm packet */
 414         tf = proto_tree_add_text(tree, tvb, offset, 1,
 415                         "Flags: 0x%02x", flags);
 416         field_tree = proto_item_add_subtree( tf, ett_netb_flags);
 417
 418         proto_tree_add_boolean( field_tree, hf_netb_send_no_ack, tvb, offset, 1, flags);
 419
 420         proto_tree_add_boolean( field_tree, hf_netb_version, tvb, offset, 1, flags);
 421 }
 422
 423
 424 static void netbios_add_session_init_flags( tvbuff_t *tvb, proto_tree *tree,
 425         int offset)
 426 {
 427         proto_tree *field_tree;
 428         proto_item *tf;
 429         guint flags = tvb_get_guint8( tvb, offset);
 430                 /* decode the flag field for Session Init packet */
 431
 432         tf = proto_tree_add_text(tree, tvb, offset, 1,
 433                         "Flags: 0x%02x", flags);
 434         field_tree = proto_item_add_subtree(tf, ett_netb_flags);
 435
 436         proto_tree_add_boolean( field_tree, hf_netb_send_no_ack, tvb, offset, 1, flags);
 437
 438         proto_tree_add_uint( field_tree, hf_netb_largest_frame, tvb, offset, 1,
 439                 flags);
 440
 441         proto_tree_add_boolean( field_tree, hf_netb_version, tvb, offset, 1, flags);
 442 }
 443
 444
 445 static void netbios_no_receive_flags( tvbuff_t *tvb, proto_tree *tree,
 446     int offset)
 447
 448 {
 449         proto_tree *field_tree;
 450         proto_item *tf;
 451         guint flags = tvb_get_guint8( tvb, offset);
 452
 453                 /* decode the flag field for No Receive packet*/
 454
 455         tf = proto_tree_add_text(tree, tvb, offset, 1,
 456                         "Flags: 0x%02x", flags);
 457
 458         if (flags & 0x02) {
 459                 field_tree = proto_item_add_subtree(tf, ett_netb_flags);
 460                 proto_tree_add_text(field_tree, tvb, offset, 1, "%s",
 461                     decode_boolean_bitfield(flags, 0x02, 8,
 462                         "SEND.NO.ACK data not received", NULL));
 463         }
 464 }
 465
 466
 467 /************************************************************************/
 468 /*                                                                      */
 469 /*  The routines to display the netbios field values in the tree        */
 470 /*                                                                      */
 471 /************************************************************************/
 472
 473
 474 static void nb_xmit_corrl( tvbuff_t *tvb, int offset, proto_tree *tree)
 475
 476 {/* display the transmit correlator */
 477
 478         proto_tree_add_item( tree, hf_netb_xmit_corrl, tvb, offset + NB_XMIT_CORL,
 479                 2, TRUE);
 480 }
 481
 482
 483 static void nb_resp_corrl( tvbuff_t *tvb, int offset, proto_tree *tree)
 484
 485 {/* display the response correlator */
 486
 487         proto_tree_add_item( tree, hf_netb_resp_corrl, tvb, offset + NB_RESP_CORL,
 488                 2, TRUE);
 489 }
 490
 491
 492 static void nb_call_name_type( tvbuff_t *tvb, int offset, proto_tree *tree)
 493
 494 {/* display the call name type */
 495
 496         proto_tree_add_item( tree, hf_netb_call_name_type, tvb, offset + NB_CALL_NAME_TYPE,
 497                 1, TRUE);
 498
 499 }
 500
 501
 502 static guint8 nb_local_session( tvbuff_t *tvb, int offset, proto_tree *tree)
 503
 504 {/* add the local session to tree, and return its value */
 505
 506         guint8 local_session = tvb_get_guint8( tvb, offset + NB_LOCAL_SES);
 507
 508         proto_tree_add_uint( tree, hf_netb_local_ses_no, tvb, offset + NB_LOCAL_SES, 1,
 509                 local_session);
 510
 511         return local_session;
 512 }
 513
 514
 515 static guint8 nb_remote_session( tvbuff_t *tvb, int offset, proto_tree *tree)
 516
 517 {/* add the remote session to tree, and return its value */
 518
 519         guint8 remote_session = tvb_get_guint8( tvb, offset + NB_RMT_SES);
 520
 521         proto_tree_add_uint( tree, hf_netb_remote_ses_no, tvb, offset + NB_RMT_SES, 1,
 522                 remote_session);
 523
 524         return remote_session;
 525 }
 526
 527
 528 static void nb_data1(int hf, tvbuff_t *tvb, int offset, proto_tree *tree)
 529
 530 {/* add the DATA1 to tree with specified hf_ value */
 531
 532         proto_tree_add_item( tree, hf, tvb, offset + NB_DATA1, 1, TRUE);
 533
 534 }
 535
 536
 537 static void nb_data2(int hf, tvbuff_t *tvb, int offset, proto_tree *tree)
 538
 539 {/* add the DATA2 to tree with specified hf_ value */
 540
 541         proto_tree_add_item( tree, hf, tvb, offset + NB_DATA2, 2, TRUE);
 542
 543 }
 544
 545
 546 static void nb_resync_indicator( tvbuff_t *tvb, int offset, proto_tree *tree, char *cmd_str)
 547 {
 548         guint16 resync_indicator = tvb_get_letohs( tvb, offset + NB_DATA2);
 549
 550
 551         switch (resync_indicator) {
 552
 553         case 0x0000:
 554                 proto_tree_add_text(tree, tvb, offset + NB_DATA2, 2,
 555                     "Re-sync indicator: No re-sync");
 556                 break;
 557
 558         case 0x0001:
 559                 proto_tree_add_text(tree, tvb, offset + NB_DATA2, 2,
 560                     "Re-sync indicator: First '%s' following 'Receive Outstanding'", cmd_str);
 561                 break;
 562
 563         default:
 564                 proto_tree_add_text(tree, tvb, offset + NB_DATA2, 2,
 565                     "Re-sync indicator: 0x%04x", resync_indicator);
 566                 break;
 567         }
 568 }
 569
 570 /************************************************************************/
 571 /*                                                                      */
 572 /*  The routines called by the top level to handle individual commands  */
 573 /*                                                                      */
 574 /************************************************************************/
 575
 576 static guint32
 577 dissect_netb_unknown( tvbuff_t *tvb, int offset, proto_tree *tree)
 578
 579 {/* Handle any unknown commands, do nothing */
 580
 581         proto_tree_add_text(tree, tvb, offset + NB_COMMAND + 1, -1,
 582             "Unknown NetBIOS command data");
 583
 584         return 0;
 585 }
 586
 587
 588 static guint32
 589 dissect_netb_add_group_name( tvbuff_t *tvb, int offset, proto_tree *tree)
 590
 591 {/* Handle the ADD GROUP NAME QUERY command */
 592
 593         nb_resp_corrl( tvb, offset, tree);
 594
 595         netbios_add_name("Group name to add", tvb, offset + NB_SENDER_NAME,
 596             tree);
 597
 598         return 0;
 599 }
 600
 601
 602 static guint32
 603 dissect_netb_add_name( tvbuff_t *tvb, int offset, proto_tree *tree)
 604
 605 {/* Handle the ADD NAME QUERY command */
 606
 607         nb_resp_corrl( tvb, offset, tree);
 608
 609         netbios_add_name("Name to add", tvb, offset + NB_SENDER_NAME, tree);
 610
 611         return 0;
 612 }
 613
 614
 615 static guint32
 616 dissect_netb_name_in_conflict( tvbuff_t *tvb, int offset, proto_tree *tree)
 617
 618 {/* Handle the NAME IN CONFLICT command */
 619
 620         netbios_add_name("Name In Conflict", tvb, offset + NB_RECVER_NAME,
 621             tree);
 622         netbios_add_name("Sender's Name", tvb, offset + NB_SENDER_NAME, tree);
 623
 624         return 0;
 625 }
 626
 627
 628 static guint32
 629 dissect_netb_status_query( tvbuff_t *tvb, int offset, proto_tree *tree)
 630
 631 {/* Handle the STATUS QUERY command */
 632
 633         guint8 status_request = tvb_get_guint8( tvb, offset + NB_DATA1);
 634
 635         switch (status_request) {
 636
 637         case 0:
 638                 proto_tree_add_text(tree, tvb, offset + NB_DATA1, 1,
 639                     "Status request: NetBIOS 1.x or 2.0");
 640                 break;
 641
 642         case 1:
 643                 proto_tree_add_text(tree, tvb, offset + NB_DATA1, 1,
 644                     "Status request: NetBIOS 2.1, initial status request");
 645                 break;
 646
 647         default:
 648                 proto_tree_add_text(tree, tvb, offset + NB_DATA1, 1,
 649                     "Status request: NetBIOS 2.1, %u names received so far",
 650                     status_request);
 651                 break;
 652         }
 653         nb_data2( hf_netb_status_buffer_len, tvb, offset, tree);
 654         nb_resp_corrl( tvb, offset, tree);
 655         netbios_add_name("Receiver's Name", tvb, offset + NB_RECVER_NAME, tree);
 656         netbios_add_name("Sender's Name", tvb, offset + NB_SENDER_NAME, tree);
 657
 658         return 0;
 659 }
 660
 661
 662 static guint32
 663 dissect_netb_terminate_trace( tvbuff_t *tvb _U_, int offset _U_, proto_tree *tree _U_)
 664
 665 {/* Handle the TERMINATE TRACE command */
 666
 667         /*
 668          * XXX - are any of the fields in this message significant?
 669          * The IBM NetBIOS document shows them as "Reserved".
 670          */
 671
 672         return 0;
 673 }
 674
 675
 676 static guchar zeroes[10];
 677
 678 static guint32
 679 dissect_netb_datagram( tvbuff_t *tvb, int offset, proto_tree *tree)
 680
 681 {/* Handle the DATAGRAM command */
 682
 683         netbios_add_name("Receiver's Name", tvb, offset + NB_RECVER_NAME, tree);
 684         /* Weird.  In some datagrams, this is 10 octets of 0, followed
 685            by a MAC address.... */
 686
 687         if (memcmp( tvb_get_ptr( tvb,offset + NB_SENDER_NAME, 10), zeroes, 10) == 0) {
 688                 proto_tree_add_text( tree, tvb, offset + NB_SENDER_NAME + 10, 6,
 689                     "Sender's MAC Address: %s",
 690                     ether_to_str( tvb_get_ptr( tvb,offset + NB_SENDER_NAME + 10, 6)));
 691         } else {
 692                 netbios_add_name("Sender's Name", tvb, offset + NB_SENDER_NAME,
 693                     tree);
 694         }
 695
 696         return 0;
 697 }
 698
 699
 700 static guint32
 701 dissect_netb_datagram_bcast( tvbuff_t *tvb, int offset, proto_tree *tree)
 702
 703 {/* Handle the DATAGRAM BROADCAST command */
 704
 705         /* We assume the same weirdness can happen here.... */
 706         if ( memcmp( tvb_get_ptr( tvb,offset + NB_SENDER_NAME + 10, 6), zeroes, 10) == 0) {
 707                 proto_tree_add_text( tree, tvb, offset + NB_SENDER_NAME + 10, 6,
 708                     "Sender's Node Address: %s",
 709                     ether_to_str( tvb_get_ptr( tvb,offset + NB_SENDER_NAME + 10, 6)));
 710         } else {
 711                 netbios_add_name("Sender's Name", tvb, offset + NB_SENDER_NAME,
 712                     tree);
 713         }
 714
 715         return 0;
 716 }
 717
 718
 719 static guint32
 720 dissect_netb_name_query( tvbuff_t *tvb, int offset, proto_tree *tree)
 721
 722 {/* Handle the NAME QUERY command */
 723         guint8 local_session_number = tvb_get_guint8( tvb, offset + NB_DATA2);
 724
 725         if (local_session_number == 0) {
 726                 proto_tree_add_text( tree, tvb, offset + NB_DATA2, 1,
 727                     "Local Session No.: 0 (FIND.NAME request)");
 728         } else {
 729                 proto_tree_add_text( tree, tvb, offset + NB_DATA2, 1,
 730                     "Local Session No.: 0x%02x", local_session_number);
 731         }
 732         nb_call_name_type( tvb, offset, tree);
 733         nb_resp_corrl( tvb, offset, tree);
 734         netbios_add_name("Query Name", tvb, offset + NB_RECVER_NAME, tree);
 735         if (local_session_number != 0) {
 736                 netbios_add_name("Sender's Name", tvb, offset + NB_SENDER_NAME,
 737                     tree);
 738         }
 739
 740         return 0;
 741 }
 742
 743
 744 static guint32
 745 dissect_netb_add_name_resp( tvbuff_t *tvb, int offset, proto_tree *tree)
 746
 747 {/* Handle the ADD NAME RESPONSE command */
 748
 749         nb_data1( hf_netb_status, tvb, offset, tree);
 750         nb_data2( hf_netb_name_type, tvb, offset, tree);
 751         nb_xmit_corrl( tvb, offset, tree);
 752         netbios_add_name("Name to be added", tvb, offset + NB_RECVER_NAME,
 753             tree);
 754         netbios_add_name("Name to be added", tvb, offset + NB_SENDER_NAME,
 755             tree);
 756
 757         return 0;
 758 }
 759
 760
 761 static guint32
 762 dissect_netb_name_resp( tvbuff_t *tvb, int offset, proto_tree *tree)
 763
 764 {/* Handle the NAME RECOGNIZED command */
 765         guint8 local_session_number = tvb_get_guint8( tvb, offset + NB_DATA2);
 766
 767         switch (local_session_number) {
 768
 769         case 0x00:
 770                 proto_tree_add_text( tree, tvb, offset + NB_DATA2, 1,
 771                     "State of name: No LISTEN pending, or FIND.NAME response");
 772                 break;
 773
 774         case 0xFF:
 775                 proto_tree_add_text( tree, tvb, offset + NB_DATA2, 1,
 776                     "State of name: LISTEN pending, but insufficient resources to establish session");
 777                 break;
 778
 779         default:
 780                 proto_tree_add_text( tree, tvb, offset + NB_DATA2, 1,
 781                     "Local Session No.: 0x%02x", local_session_number);
 782                 break;
 783         }
 784         nb_call_name_type( tvb, offset, tree);
 785         nb_xmit_corrl( tvb, offset, tree);
 786         if (local_session_number != 0x00 && local_session_number != 0xFF)
 787                 nb_resp_corrl(tvb, offset, tree);
 788         netbios_add_name("Receiver's Name", tvb, offset + NB_RECVER_NAME, tree);
 789         if (local_session_number != 0x00 && local_session_number != 0xFF) {
 790                 netbios_add_name("Sender's Name", tvb, offset + NB_SENDER_NAME,
 791                     tree);
 792         }
 793
 794         return 0;
 795 }
 796
 797
 798 static guint32
 799 dissect_netb_status_resp( tvbuff_t *tvb, int offset, proto_tree *tree)
 800
 801 {/* Handle the STATUS RESPONSE command */
 802         guint8 status_response = tvb_get_guint8( tvb, offset + NB_DATA1);
 803         proto_item *td2;
 804         proto_tree *data2_tree;
 805         guint16 data2;
 806
 807         nb_call_name_type( tvb, offset, tree);
 808         if (status_response == 0) {
 809                 proto_tree_add_text(tree, tvb, offset + NB_DATA1, 1,
 810                     "Status response: NetBIOS 1.x or 2.0");
 811         } else {
 812                 proto_tree_add_text(tree, tvb, offset + NB_DATA1, 1,
 813                     "Status response: NetBIOS 2.1, %u names sent so far",
 814                     status_response);
 815         }
 816         data2 = tvb_get_letohs( tvb, offset + NB_DATA2);
 817
 818         td2 = proto_tree_add_text(tree, tvb, offset + NB_DATA2, 2, "Status: 0x%04x",
 819             data2);
 820         data2_tree = proto_item_add_subtree(td2, ett_netb_status);
 821         if (data2 & 0x8000) {
 822                 proto_tree_add_text(data2_tree, tvb, offset, 2, "%s",
 823                     decode_boolean_bitfield(data2, 0x8000, 8*2,
 824                         "Data length exceeds maximum frame size", NULL));
 825         }
 826         if (data2 & 0x4000) {
 827                 proto_tree_add_text(data2_tree, tvb, offset, 2, "%s",
 828                     decode_boolean_bitfield(data2, 0x4000, 8*2,
 829                         "Data length exceeds user's buffer", NULL));
 830         }
 831         proto_tree_add_text(data2_tree, tvb, offset, 2, "%s",
 832             decode_numeric_bitfield(data2, 0x3FFF, 2*8,
 833                         "Status data length = %u"));
 834         nb_xmit_corrl( tvb, offset, tree);
 835         netbios_add_name("Receiver's Name", tvb, offset + NB_RECVER_NAME, tree);
 836         netbios_add_name("Sender's Name", tvb, offset + NB_SENDER_NAME,
 837             tree);
 838
 839         return 0;
 840 }
 841
 842
 843 static guint32
 844 dissect_netb_data_ack( tvbuff_t* tvb, int offset, proto_tree *tree)
 845
 846 {/* Handle the DATA ACK command */
 847
 848         nb_xmit_corrl( tvb, offset, tree);
 849         nb_remote_session( tvb, offset, tree);
 850         nb_local_session( tvb, offset, tree);
 851
 852         return 0;
 853 }
 854
 855
 856 static guint32
 857 dissect_netb_data_first_middle( tvbuff_t *tvb, int offset, proto_tree *tree)
 858
 859 {/* Handle the DATA FIRST MIDDLE command */
 860
 861         guint8 remote_session, local_session;
 862
 863         /*
 864          * This is the first frame, or the middle frame, of a fragmented
 865          * packet.
 866          *
 867          * XXX - there are no sequence numbers, so we have to assume
 868          * that fragments arrive in order with no duplicates.
 869          * In fact, 802.2 LLC is supposed to handle that, so we
 870          * might have to have the LLC dissector do so (but the TCP
 871          * dissector doesn't currently handle out-of-order or duplicate
 872          * data, either).
 873          */
 874
 875         netbios_data_first_middle_flags( tvb, tree, offset + NB_FLAGS);
 876
 877         nb_resync_indicator( tvb, offset, tree, "DATA FIRST MIDDLE");
 878         nb_xmit_corrl( tvb, offset, tree);
 879         nb_resp_corrl( tvb, offset, tree);
 880         remote_session = nb_remote_session( tvb, offset, tree);
 881         local_session = nb_local_session( tvb, offset, tree);
 882
 883         /*
 884          * Return a combination of the remote and local session numbers,
 885          * for use when reassembling.
 886          */
 887         return (remote_session << 8) + local_session;
 888 }
 889
 890
 891 static guint32
 892 dissect_netb_data_only_last( tvbuff_t *tvb, int offset, proto_tree *tree)
 893
 894 {/* Handle the DATA ONLY LAST command */
 895
 896         guint8 remote_session, local_session;
 897
 898         /*
 899          * This is a complete packet, or the last frame of a fragmented
 900          * packet.
 901          */
 902
 903         netbios_data_only_flags( tvb, tree, offset + NB_FLAGS);
 904
 905         nb_resync_indicator( tvb, offset, tree, "DATA ONLY LAST");
 906         nb_xmit_corrl( tvb, offset, tree);
 907         nb_resp_corrl( tvb, offset, tree);
 908         remote_session = nb_remote_session( tvb, offset, tree);
 909         local_session = nb_local_session( tvb, offset, tree);
 910
 911         /*
 912          * Return a combination of the remote and local session numbers,
 913          * for use when reassembling.
 914          */
 915         return (remote_session << 8) + local_session;
 916 }
 917
 918
 919 static guint32
 920 dissect_netb_session_confirm( tvbuff_t *tvb, int offset, proto_tree *tree)
 921
 922 {/* Handle the SESSION CONFIRM command */
 923
 924         netbios_add_ses_confirm_flags( tvb, tree, offset + NB_FLAGS);
 925
 926         nb_data2( hf_netb_max_data_recv_size, tvb, offset, tree);
 927         nb_xmit_corrl( tvb, offset, tree);
 928         nb_resp_corrl( tvb, offset, tree);
 929         nb_remote_session( tvb, offset, tree);
 930         nb_local_session( tvb, offset, tree);
 931
 932         return 0;
 933 }
 934
 935
 936 static guint32
 937 dissect_netb_session_end( tvbuff_t *tvb, int offset, proto_tree *tree)
 938
 939 {/* Handle the SESSION END command */
 940
 941         nb_data2( hf_netb_termination_indicator, tvb, offset, tree);
 942         nb_remote_session( tvb, offset, tree);
 943         nb_local_session( tvb, offset, tree);
 944
 945         return 0;
 946 }
 947
 948
 949 static guint32
 950 dissect_netb_session_init( tvbuff_t *tvb, int offset, proto_tree *tree)
 951
 952 {/* Handle the SESSION INITIALIZE command */
 953
 954         netbios_add_session_init_flags( tvb, tree, offset + NB_FLAGS);
 955
 956         nb_data2( hf_netb_max_data_recv_size, tvb, offset, tree);
 957         nb_resp_corrl( tvb, offset, tree);
 958         nb_xmit_corrl( tvb, offset, tree);
 959         nb_remote_session( tvb, offset, tree);
 960         nb_local_session( tvb, offset, tree);
 961
 962         return 0;
 963 }
 964
 965 static guint32
 966 dissect_netb_no_receive( tvbuff_t *tvb, int offset, proto_tree *tree)
 967
 968 {/* Handle the NO RECEIVE command */
 969
 970         netbios_no_receive_flags( tvb, tree, offset + NB_FLAGS);
 971
 972         nb_data2( hf_netb_num_data_bytes_accepted, tvb, offset, tree);
 973         nb_remote_session( tvb, offset, tree);
 974         nb_local_session( tvb, offset, tree);
 975
 976         return 0;
 977 }
 978
 979
 980 static guint32
 981 dissect_netb_receive_outstanding( tvbuff_t *tvb, int offset, proto_tree *tree)
 982
 983 {/* Handle the RECEIVE OUTSTANDING command */
 984
 985         nb_data2( hf_netb_num_data_bytes_accepted, tvb, offset, tree);
 986         nb_remote_session( tvb, offset, tree);
 987         nb_local_session( tvb, offset, tree);
 988
 989         return 0;
 990 }
 991
 992
 993 static guint32
 994 dissect_netb_receive_continue( tvbuff_t *tvb, int offset, proto_tree *tree)
 995
 996 {/* Handle the RECEIVE CONTINUE command */
 997
 998         nb_xmit_corrl( tvb, offset, tree);
 999         nb_remote_session( tvb, offset, tree);
1000         nb_local_session( tvb, offset, tree);
1001
1002         return 0;
1003 }
1004
1005
1006 static guint32
1007 dissect_netb_session_alive( tvbuff_t *tvb, int offset, proto_tree *tree)
1008
1009 {/* Handle the SESSION ALIVE command */
1010
1011         /*
1012          * XXX - all the fields are claimed to be "Reserved", but
1013          * the session numbers appear to be non-zero in at least
1014          * one capture, and they do appear to match session numbers
1015          * in other messages, and I'd expect that you had to identify
1016          * sessions in this message in any case.
1017          *
1018          * We show only those fields.
1019          */
1020         nb_remote_session( tvb, offset, tree);
1021         nb_local_session( tvb, offset, tree);
1022
1023         return 0;
1024 }
1025
1026
1027 /************************************************************************/
1028 /*                                                                      */
1029 /*  The table routines called by the top level to handle commands       */
1030 /*                                                                      */
1031 /************************************************************************/
1032
1033
1034 static guint32 (*dissect_netb[])(tvbuff_t *, int, proto_tree *) = {
1035
1036   dissect_netb_add_group_name,  /* Add Group Name       0x00 */
1037   dissect_netb_add_name,        /* Add Name             0x01 */
1038   dissect_netb_name_in_conflict,/* Name In Conflict     0x02 */
1039   dissect_netb_status_query,    /* Status Query         0x03 */
1040   dissect_netb_unknown,         /* unknown              0x04 */
1041   dissect_netb_unknown,         /* unknown              0x05 */
1042   dissect_netb_unknown,         /* unknown              0x06 */
1043   dissect_netb_terminate_trace, /* Terminate Trace      0x07 */
1044   dissect_netb_datagram,        /* Datagram             0x08 */
1045   dissect_netb_datagram_bcast,  /* Datagram Broadcast   0x09 */
1046   dissect_netb_name_query,      /* Name Query           0x0A */
1047   dissect_netb_unknown,         /* unknown              0x0B */
1048   dissect_netb_unknown,         /* unknown              0x0C */
1049   dissect_netb_add_name_resp,   /* Add Name Response    0x0D */
1050   dissect_netb_name_resp,       /* Name Recognized      0x0E */
1051   dissect_netb_status_resp,     /* Status Response      0x0F */
1052   dissect_netb_unknown,         /* unknown              0x10 */
1053   dissect_netb_unknown,         /* unknown              0x11 */
1054   dissect_netb_unknown,         /* unknown              0x12 */
1055   dissect_netb_terminate_trace, /* Terminate Trace      0x13 */
1056   dissect_netb_data_ack,        /* Data Ack             0x14 */
1057   dissect_netb_data_first_middle,/* Data First Middle   0x15 */
1058   dissect_netb_data_only_last,  /* Data Only Last       0x16 */
1059   dissect_netb_session_confirm, /* Session Confirm      0x17 */
1060   dissect_netb_session_end,     /* Session End          0x18 */
1061   dissect_netb_session_init,    /* Session Initialize   0x19 */
1062   dissect_netb_no_receive,      /* No Receive           0x1A */
1063   dissect_netb_receive_outstanding,/* Receive Outstanding 0x1B */
1064   dissect_netb_receive_continue,/* Receive Continue     0x1C */
1065   dissect_netb_unknown,         /* unknown              0x1D */
1066   dissect_netb_unknown,         /* unknown              0x1E */
1067   dissect_netb_session_alive,   /* Session Alive        0x1f */
1068   dissect_netb_unknown,
1069 };
1070
1071 static heur_dissector_list_t netbios_heur_subdissector_list;
1072
1073 void
1074 dissect_netbios_payload(tvbuff_t *tvb, packet_info *pinfo, proto_tree *tree)
1075 {
1076         /*
1077          * Try the heuristic dissectors for NetBIOS; if none of them
1078          * accept the packet, dissect it as data.
1079          */
1080         if (!dissector_try_heuristic(netbios_heur_subdissector_list,
1081                                     tvb, pinfo, tree))
1082                 call_dissector(data_handle,tvb, pinfo, tree);
1083 }
1084
1085 static void
1086 dissect_netbios(tvbuff_t *tvb, packet_info *pinfo, proto_tree *tree)
1087
1088 {
1089         proto_tree              *netb_tree = NULL;
1090         proto_item              *ti;
1091         guint16                 hdr_len, command;
1092         char                    *command_name;
1093         char                    name[(NETBIOS_NAME_LEN - 1)*4 + 1];
1094         int                     name_type;
1095         guint16                 session_id;
1096         gboolean                save_fragmented;
1097         int                     len;
1098         fragment_data           *fd_head;
1099         tvbuff_t                *next_tvb;
1100
1101         int offset = 0;
1102
1103                                         /* load the display labels      */
1104         if (check_col(pinfo->cinfo, COL_PROTOCOL))
1105                 col_set_str(pinfo->cinfo, COL_PROTOCOL, "NetBIOS");
1106
1107
1108 /* Find NetBIOS marker EFFF, this is done because I have seen an extra LLC */
1109 /* byte on our network. This only checks for one extra LLC byte. */
1110
1111         if ( 0xefff != tvb_get_letohs(tvb, 2)){
1112                 ++offset;
1113                 if ( 0xefff != tvb_get_letohs(tvb, 3)){
1114
1115                         if (check_col( pinfo->cinfo, COL_INFO))         /* print bad packet */
1116                                 col_set_str( pinfo->cinfo, COL_INFO, "Bad packet, no 0xEFFF marker");
1117
1118                         return;         /* this is an unknow packet, no marker */
1119                 }
1120         }
1121
1122
1123         hdr_len = tvb_get_letohs(tvb, offset + NB_LENGTH);
1124         command = tvb_get_guint8( tvb, offset + NB_COMMAND);
1125                                         /* limit command so no table overflows */
1126         command = MIN( command, sizeof( dissect_netb)/ sizeof(void *));
1127
1128         if (check_col( pinfo->cinfo, COL_INFO)) {              /* print command name */
1129                 command_name = val_to_str(command, cmd_vals, "Unknown (0x%02x)");
1130                 switch ( command ) {
1131                 case NB_NAME_QUERY:
1132                         name_type = get_netbios_name( tvb, offset + 12, name);
1133                         col_add_fstr( pinfo->cinfo, COL_INFO, "%s for %s<%02x>",
1134                             command_name, name, name_type);
1135                         break;
1136
1137                 case NB_NAME_RESP:
1138                 case NB_ADD_NAME:
1139                 case NB_ADD_GROUP:
1140                         name_type = get_netbios_name( tvb, offset + 28, name);
1141                         col_add_fstr( pinfo->cinfo, COL_INFO, "%s - %s<%02x>",
1142                             command_name, name, name_type);
1143                         break;
1144
1145                 default:
1146                         col_add_fstr( pinfo->cinfo, COL_INFO, "%s",
1147                             command_name);
1148                         break;
1149                 }
1150         }
1151
1152         if ( tree) {
1153                 ti = proto_tree_add_item(tree, proto_netbios, tvb, 0, hdr_len, FALSE);
1154                 netb_tree = proto_item_add_subtree(ti, ett_netb);
1155
1156                 proto_tree_add_uint_format(netb_tree, hf_netb_hdr_len, tvb, offset, 2, hdr_len,
1157                         "Length: %d bytes", hdr_len);
1158
1159                 proto_tree_add_text(netb_tree, tvb, offset + 2, 2,
1160                         "Delimiter: EFFF (NetBIOS)");
1161
1162                 proto_tree_add_uint(netb_tree, hf_netb_cmd, tvb, offset + NB_COMMAND, 1, command);
1163         }
1164
1165                                         /* if command in table range */
1166         if ( command < sizeof( dissect_netb)/ sizeof(void *)) {
1167
1168                                         /* branch to handle commands */
1169                 session_id = (dissect_netb[ command])( tvb, offset, netb_tree);
1170
1171                 offset += hdr_len;                      /* move past header */
1172
1173                 save_fragmented = pinfo->fragmented;
1174
1175                 /*
1176                  * Process user data in frames that have it.
1177                  */
1178                 switch (command) {
1179
1180                 case NB_DATAGRAM:
1181                 case NB_DATAGRAM_BCAST:
1182                         /*
1183                          * No fragmentation here.
1184                          */
1185                         next_tvb = tvb_new_subset(tvb, offset, -1, -1);
1186                         dissect_netbios_payload(next_tvb, pinfo, tree);
1187                         break;
1188
1189                 case NB_DATA_FIRST_MIDDLE:
1190                 case NB_DATA_ONLY_LAST:
1191                         /*
1192                          * Possibly fragmented.
1193                          */
1194                         if (netbios_defragment) {
1195                                 len = tvb_length_remaining(tvb, offset);
1196                                 fd_head = fragment_add_seq_next(tvb, offset,
1197                                     pinfo, session_id,
1198                                     netbios_fragment_table,
1199                                     netbios_reassembled_table,
1200                                     len, command == NB_DATA_FIRST_MIDDLE);
1201                                 if (fd_head != NULL) {
1202                                         if (fd_head->next != NULL) {
1203                                                 next_tvb = tvb_new_real_data(fd_head->data,
1204                                                     fd_head->len, fd_head->len);
1205                                                 tvb_set_child_real_data_tvbuff(tvb,
1206                                                     next_tvb);
1207                                                 add_new_data_source(pinfo,
1208                                                     next_tvb,
1209                                                     "Reassembled NetBIOS");
1210                                                 /* Show all fragments. */
1211                                                 if (tree) {
1212                                                         show_fragment_seq_tree(fd_head,
1213                                                             &netbios_frag_items,
1214                                                             netb_tree, pinfo,
1215                                                             next_tvb);
1216                                                 }
1217                                         } else {
1218                                                 next_tvb = tvb_new_subset(tvb,
1219                                                     offset, -1, -1);
1220                                         }
1221                                 } else {
1222                                         next_tvb = NULL;
1223                                 }
1224                         } else {
1225                                 /*
1226                                  * Dissect this, regardless of whether
1227                                  * it's NB_DATA_FIRST_MIDDLE or
1228                                  * NB_DATA_ONLY_LAST.
1229                                  *
1230                                  * XXX - it'd be nice to show
1231                                  * NB_DATA_FIRST_MIDDLE as a fragment
1232                                  * if it's not the first fragment (i.e.,
1233                                  * MIDDLE rather than FIRST), and show
1234                                  * NB_DATA_ONLY_LAST as a fragment if
1235                                  * it's part of a fragmented datagram
1236                                  * (i.e, LAST rather than ONLY), but
1237                                  * we'd have to do reassembly to
1238                                  * be able to determine that.
1239                                  */
1240                                 next_tvb = tvb_new_subset(tvb, offset, -1, -1);
1241                         }
1242                         if (next_tvb != NULL)
1243                                 dissect_netbios_payload(next_tvb, pinfo, tree);
1244                         else {
1245                                 next_tvb = tvb_new_subset (tvb, offset, -1, -1);
1246                                 call_dissector(data_handle, next_tvb, pinfo,
1247                                     tree);
1248                         }
1249                         break;
1250                 }
1251         }
1252 }
1253
1254 static void
1255 netbios_init(void)
1256 {
1257         /*
1258          * Initialize the fragment and reassembly tables.
1259          */
1260         fragment_table_init(&netbios_fragment_table);
1261         reassembled_table_init(&netbios_reassembled_table);
1262 }
1263
1264 void proto_register_netbios(void)
1265 {
1266         static gint *ett[] = {
1267                 &ett_netb,
1268                 &ett_netb_name,
1269                 &ett_netb_flags,
1270                 &ett_netb_status,
1271                 &ett_netb_fragments,
1272                 &ett_netb_fragment,
1273         };
1274
1275         static hf_register_info hf_netb[] = {
1276                 { &hf_netb_cmd,
1277                 { "Command", "netbios.command", FT_UINT8, BASE_HEX, VALS(cmd_vals), 0x0,
1278                         "", HFILL }},
1279
1280                 { &hf_netb_hdr_len,
1281                 { "Header Length", "netbios.hdr_len", FT_UINT16, BASE_DEC, NULL, 0x0,
1282                         "", HFILL }},
1283
1284                 { &hf_netb_xmit_corrl,
1285                 { "Transmit Correlator", "netbios.xmit_corrl", FT_UINT16, BASE_HEX, NULL, 0x0,
1286                         "", HFILL }},
1287
1288                 { &hf_netb_resp_corrl,
1289                 { "Response Correlator", "netbios.resp_corrl", FT_UINT16, BASE_HEX, NULL, 0x0,
1290                         "", HFILL }},
1291
1292                 { &hf_netb_call_name_type,
1293                 { "Caller's Name Type", "netbios.call_name_type", FT_UINT8, BASE_HEX, VALS(name_types), 0x0,
1294                         "", HFILL }},
1295
1296                 { &hf_netb_nb_name_type,
1297                 { "NetBIOS Name Type", "netbios.nb_name_type", FT_UINT8, BASE_HEX, VALS(nb_name_type_vals), 0x0,
1298                         "", HFILL }},
1299
1300                 { &hf_netb_nb_name,
1301                 { "NetBIOS Name", "netbios.nb_name", FT_STRING, BASE_NONE, NULL, 0x0,
1302                         "", HFILL }},
1303
1304                 { &hf_netb_ack,
1305                 { "Acknowledge", "netbios.ack", FT_BOOLEAN, 8, TFS( &flags_set), 0x08,
1306                         "", HFILL }},
1307
1308                 { &hf_netb_ack_with_data,
1309                 { "Acknowledge with data", "netbios.ack_with_data", FT_BOOLEAN, 8, TFS( &flags_allowed), 0x04,
1310                         "", HFILL }},
1311
1312                 { &hf_netb_ack_expected,
1313                 { "Acknowledge expected", "netbios.ack_expected", FT_BOOLEAN,  8,
1314                         TFS( &flags_yes_no), 0x02, "", HFILL }},
1315
1316                 { &hf_netb_recv_cont_req,
1317                 { "RECEIVE_CONTINUE requested", "netbios.recv_cont_req", FT_BOOLEAN,  8,
1318                         TFS( &flags_yes_no), 0x01, "", HFILL }},
1319
1320                 { &hf_netb_send_no_ack,
1321                 { "Handle SEND.NO.ACK", "netbios.send_no_ack", FT_BOOLEAN,  8,
1322                         TFS( &flags_yes_no), 0x80, "", HFILL }},
1323
1324                 { &hf_netb_version,
1325                 { "NetBIOS Version", "netbios.version", FT_BOOLEAN,  8,
1326                         TFS( &netb_version_str), 0x01, "", HFILL }},
1327
1328                 { &hf_netb_largest_frame,
1329                 { "Largest Frame", "netbios.largest_frame", FT_UINT8, BASE_DEC, VALS(max_frame_size_vals), 0x0E,
1330                         "", HFILL }},
1331
1332                 { &hf_netb_status_buffer_len,
1333                 { "Length of status buffer", "netbios.status_buffer_len", FT_UINT16, BASE_DEC, NULL, 0x0,
1334                         "", HFILL }},
1335
1336                 { &hf_netb_status,
1337                 { "Status", "netbios.status", FT_UINT8, BASE_DEC, VALS(status_vals), 0x0,
1338                         "", HFILL }},
1339
1340                 { &hf_netb_name_type,
1341                 { "Name type", "netbios.name_type", FT_UINT16, BASE_DEC, VALS(name_types), 0x0,
1342                         "", HFILL }},
1343
1344                 { &hf_netb_max_data_recv_size,
1345                 { "Maximum data receive size", "netbios.max_data_recv_size", FT_UINT16, BASE_DEC, NULL, 0x0,
1346                         "", HFILL }},
1347
1348                 { &hf_netb_termination_indicator,
1349                 { "Termination indicator", "netbios.termination_indicator", FT_UINT16, BASE_HEX, VALS(termination_indicator_vals), 0x0,
1350                         "", HFILL }},
1351
1352                 { &hf_netb_num_data_bytes_accepted,
1353                 { "Number of data bytes accepted", "netbios.num_data_bytes_accepted", FT_UINT16, BASE_DEC, NULL, 0x0,
1354                         "", HFILL }},
1355
1356                 { &hf_netb_local_ses_no,
1357                 { "Local Session No.", "netbios.local_session", FT_UINT8, BASE_HEX, NULL, 0x0,
1358                         "", HFILL }},
1359
1360                 { &hf_netb_remote_ses_no,
1361                 { "Remote Session No.", "netbios.remote_session", FT_UINT8, BASE_HEX, NULL, 0x0,
1362                         "", HFILL }},
1363
1364                 { &hf_netb_data1,
1365                 { "DATA1 value", "netbios.data1", FT_UINT8, BASE_HEX, NULL, 0x0,
1366                         "", HFILL }},
1367
1368                 { &hf_netb_data2,
1369                 { "DATA2 value", "netbios.data2", FT_UINT16, BASE_HEX, NULL, 0x0,
1370                         "", HFILL }},
1371
1372                 { &hf_netb_fragment_overlap,
1373                 { "Fragment overlap",   "netbios.fragment.overlap", FT_BOOLEAN, BASE_NONE,
1374                         NULL, 0x0, "Fragment overlaps with other fragments", HFILL }},
1375
1376                 { &hf_netb_fragment_overlap_conflict,
1377                 { "Conflicting data in fragment overlap", "netbios.fragment.overlap.conflict",
1378                         FT_BOOLEAN, BASE_NONE,
1379                         NULL, 0x0, "Overlapping fragments contained conflicting data", HFILL }},
1380
1381                 { &hf_netb_fragment_multiple_tails,
1382                 { "Multiple tail fragments found", "netbios.fragment.multipletails",
1383                         FT_BOOLEAN, BASE_NONE,
1384                         NULL, 0x0, "Several tails were found when defragmenting the packet", HFILL }},
1385
1386                 { &hf_netb_fragment_too_long_fragment,
1387                 { "Fragment too long",  "netbios.fragment.toolongfragment", FT_BOOLEAN, BASE_NONE,
1388                         NULL, 0x0, "Fragment contained data past end of packet", HFILL }},
1389
1390                 { &hf_netb_fragment_error,
1391                 {"Defragmentation error",       "netbios.fragment.error", FT_FRAMENUM, BASE_NONE,
1392                         NULL, 0x0, "Defragmentation error due to illegal fragments", HFILL }},
1393
1394                 { &hf_netb_fragment,
1395                 { "NetBIOS Fragment",           "netbios.fragment", FT_FRAMENUM, BASE_NONE,
1396                         NULL, 0x0, "NetBIOS Fragment", HFILL }},
1397
1398                 { &hf_netb_fragments,
1399                 { "NetBIOS Fragments",  "netbios.fragments", FT_NONE, BASE_NONE,
1400                         NULL, 0x0, "NetBIOS Fragments", HFILL }},
1401         };
1402         module_t *netbios_module;
1403
1404         proto_netbios = proto_register_protocol("NetBIOS", "NetBIOS", "netbios");
1405         proto_register_subtree_array(ett, array_length(ett));
1406         proto_register_field_array(proto_netbios, hf_netb, array_length(hf_netb));
1407
1408         register_heur_dissector_list("netbios", &netbios_heur_subdissector_list);
1409
1410         netbios_module = prefs_register_protocol(proto_netbios, NULL);
1411         prefs_register_bool_preference(netbios_module, "defragment",
1412             "Defragment all NetBIOS messages spanning multiple frames",
1413             "Whether the NetBIOS dissector should defragment all messages spanning multiple frames",
1414             &netbios_defragment);
1415
1416         register_init_routine(netbios_init);
1417 }
1418
1419 void
1420 proto_reg_handoff_netbios(void)
1421 {
1422         dissector_handle_t netbios_handle;
1423
1424         netbios_handle = create_dissector_handle(dissect_netbios,
1425             proto_netbios);
1426         dissector_add("llc.dsap", SAP_NETBIOS, netbios_handle);
1427         data_handle = find_dissector("data");
1428 }