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