epan/dissectors/packet-netsync.c

   1 /* packet-netsync.c
   2  * Routines for Monotone Netsync packet disassembly
   3  *
   4  * $Id$
   5  *
   6  * Copyright (c) 2005 by Erwin Rol <erwin@erwinrol.com>
   7  *
   8  * Wireshark - Network traffic analyzer
   9  * By Gerald Combs <gerald@wireshark.org>
  10  * Copyright 1999 Gerald Combs
  11  *
  12  * This program is free software; you can redistribute it and/or
  13  * modify it under the terms of the GNU General Public License
  14  * as published by the Free Software Foundation; either version 2
  15  * of the License, or (at your option) any later version.
  16  *
  17  * This program is distributed in the hope that it will be useful,
  18  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  19  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  20  * GNU General Public License for more details.
  21  *
  22  * You should have received a copy of the GNU General Public License
  23  * along with this program; if not, write to the Free Software
  24  * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA  02111-1307, USA.
  25  */
  26
  27 /* Include files */
  28
  29 #ifdef HAVE_CONFIG_H
  30 #include "config.h"
  31 #endif
  32
  33 #include <stdio.h>
  34 #include <stdlib.h>
  35 #include <ctype.h>
  36 #include <time.h>
  37 #include <string.h>
  38 #include <epan/packet.h>
  39 #include <epan/addr_resolv.h>
  40 #include <epan/prefs.h>
  41 #include <epan/strutil.h>
  42 #include "packet-tcp.h"
  43
  44 /*
  45  * See
  46  *
  47  *      http://www.venge.net/monotone/
  48  */
  49
  50 /* Define TCP ports for Monotone netsync */
  51
  52 #define TCP_PORT_NETSYNC 5253
  53
  54 #define NETSYNC_ROLE_SOURCE     1
  55 #define NETSYNC_ROLE_SINK       2
  56 #define NETSYNC_ROLE_BOTH       3
  57
  58 static const value_string netsync_role_vals[] = {
  59         { NETSYNC_ROLE_SOURCE,  "Source" },
  60         { NETSYNC_ROLE_SINK,    "Sink" },
  61         { NETSYNC_ROLE_BOTH,    "Both" },
  62         { 0,                    NULL }
  63 };
  64
  65
  66 #define NETSYNC_CMD_ERROR       0
  67 #define NETSYNC_CMD_BYE         1
  68 #define NETSYNC_CMD_HELLO       2
  69 #define NETSYNC_CMD_ANONYMOUS   3
  70 #define NETSYNC_CMD_AUTH        4
  71 #define NETSYNC_CMD_CONFIRM     5
  72 #define NETSYNC_CMD_REFINE      6
  73 #define NETSYNC_CMD_DONE        7
  74 #define NETSYNC_CMD_SEND_DATA   8
  75 #define NETSYNC_CMD_SEND_DELTA  9
  76 #define NETSYNC_CMD_DATA        10
  77 #define NETSYNC_CMD_DELTA       11
  78 #define NETSYNC_CMD_NONEXISTENT 12
  79
  80 static const value_string netsync_cmd_vals[] = {
  81         { NETSYNC_CMD_ERROR,            "Error" },
  82         { NETSYNC_CMD_BYE,              "Bye" },
  83         { NETSYNC_CMD_HELLO,            "Hello" },
  84         { NETSYNC_CMD_ANONYMOUS,        "Anonymous" },
  85         { NETSYNC_CMD_AUTH,             "Auth" },
  86         { NETSYNC_CMD_CONFIRM,          "Confirm" },
  87         { NETSYNC_CMD_REFINE,           "Refine" },
  88         { NETSYNC_CMD_DONE,             "Done" },
  89         { NETSYNC_CMD_SEND_DATA,        "Send Data" },
  90         { NETSYNC_CMD_SEND_DELTA,       "Send Delta" },
  91         { NETSYNC_CMD_DATA,             "Data" },
  92         { NETSYNC_CMD_DELTA,            "Delta" },
  93         { NETSYNC_CMD_NONEXISTENT,      "Nonexistent" },
  94         { 0,                            NULL }
  95 };
  96
  97 #define NETSNYC_MERKLE_HASH_LENGTH 20
  98
  99 void proto_reg_handoff_netsync(void);
 100
 101 /* Define the monotone netsync proto */
 102 static int proto_netsync = -1;
 103
 104 static int hf_netsync_version = -1;
 105 static int hf_netsync_command = -1;
 106 static int hf_netsync_size = -1;
 107 static int hf_netsync_data = -1;
 108 static int hf_netsync_checksum = -1;
 109
 110 static int hf_netsync_cmd_done_level = -1;
 111 static int hf_netsync_cmd_done_type = -1;
 112
 113 static int hf_netsync_cmd_hello_keyname = -1;
 114 static int hf_netsync_cmd_hello_key = -1;
 115 static int hf_netsync_cmd_nonce = -1;
 116
 117 static int hf_netsync_cmd_anonymous_role = -1;
 118 static int hf_netsync_cmd_anonymous_collection = -1;
 119
 120 static int hf_netsync_cmd_send_data_type = -1;
 121 static int hf_netsync_cmd_send_data_id = -1;
 122
 123 static int hf_netsync_cmd_error_msg = -1;
 124
 125
 126 static int hf_netsync_cmd_confirm_sig = -1;
 127
 128 static int hf_netsync_cmd_auth_role = -1;
 129 static int hf_netsync_cmd_auth_collection = -1;
 130 static int hf_netsync_cmd_auth_id = -1;
 131 static int hf_netsync_cmd_auth_nonce1 = -1;
 132 static int hf_netsync_cmd_auth_nonce2 = -1;
 133 static int hf_netsync_cmd_auth_sig = -1;
 134
 135 static int hf_netsync_cmd_data_type = -1;
 136 static int hf_netsync_cmd_data_id = -1;
 137 static int hf_netsync_cmd_data_compressed = -1;
 138 static int hf_netsync_cmd_data_payload = -1;
 139
 140 static int hf_netsync_cmd_delta_type = -1;
 141 static int hf_netsync_cmd_delta_base_id = -1;
 142 static int hf_netsync_cmd_delta_ident_id = -1;
 143 static int hf_netsync_cmd_delta_compressed = -1;
 144 static int hf_netsync_cmd_delta_payload = -1;
 145
 146 static int hf_netsync_cmd_refine_tree_node = -1;
 147
 148 static int hf_netsync_cmd_send_delta_type = -1;
 149 static int hf_netsync_cmd_send_delta_base_id = -1;
 150 static int hf_netsync_cmd_send_delta_ident_id = -1;
 151
 152 static int hf_netsync_cmd_nonexistent_type = -1;
 153 static int hf_netsync_cmd_nonexistent_id = -1;
 154
 155 /* Define the tree for netsync */
 156 static int ett_netsync = -1;
 157
 158
 159 /*
 160  * Here are the global variables associated with the preferences
 161  * for monotone netsync
 162  */
 163
 164 static guint global_tcp_port_netsync = TCP_PORT_NETSYNC;
 165 static gboolean netsync_desegment = TRUE;
 166
 167 static gint dissect_uleb128( tvbuff_t *tvb, gint offset, guint* size)
 168 {
 169         guint shift = 0;
 170         guint8 tmp;
 171         guint start_offset = offset;
 172
 173         *size = 0;
 174
 175         /* get size */
 176         do {
 177                 tmp = tvb_get_guint8(tvb, offset);
 178                 offset += 1;
 179
 180                 *size |= (tmp & 0x7F) << shift;
 181                 shift += 7;
 182         } while (tmp & 0x80);
 183
 184
 185         return offset - start_offset;
 186 }
 187
 188 static gint dissect_netsync_cmd_error( tvbuff_t *tvb,  gint offset, proto_tree *tree, guint size _U_)
 189 {
 190         guint len = 0;
 191
 192         offset += dissect_uleb128( tvb, offset, &len );
 193
 194         proto_tree_add_item(tree, hf_netsync_cmd_error_msg, tvb,
 195                                 offset, len, FALSE );
 196         offset += len;
 197
 198         return offset;
 199 }
 200
 201 static gint dissect_netsync_cmd_bye(tvbuff_t *tvb _U_,  gint offset, proto_tree *tree _U_, guint size _U_)
 202 {
 203         return offset;
 204 }
 205
 206
 207 static gint dissect_netsync_cmd_hello(tvbuff_t *tvb,  gint offset, proto_tree *tree, guint size _U_)
 208 {
 209         guint len = 0;
 210
 211         offset += dissect_uleb128( tvb, offset, &len );
 212
 213         proto_tree_add_item(tree, hf_netsync_cmd_hello_keyname, tvb,
 214                                 offset, len, FALSE );
 215         offset += len;
 216
 217
 218         offset += dissect_uleb128( tvb, offset, &len );
 219
 220         proto_tree_add_item(tree, hf_netsync_cmd_hello_key, tvb,
 221                                 offset, len, FALSE );
 222         offset += len;
 223
 224         proto_tree_add_item(tree, hf_netsync_cmd_nonce, tvb,
 225                                 offset, NETSNYC_MERKLE_HASH_LENGTH, FALSE );
 226         offset += NETSNYC_MERKLE_HASH_LENGTH;
 227
 228         return offset;
 229 }
 230
 231
 232 static gint dissect_netsync_cmd_anonymous(tvbuff_t *tvb,  gint offset, proto_tree *tree, guint size _U_)
 233 {
 234         guint len = 0;
 235
 236         proto_tree_add_item(tree, hf_netsync_cmd_anonymous_role, tvb,
 237                                 offset, 1, FALSE );
 238         offset += 1;
 239
 240         offset += dissect_uleb128( tvb, offset, &len );
 241
 242         proto_tree_add_item(tree, hf_netsync_cmd_anonymous_collection, tvb,
 243                                 offset, len, FALSE );
 244         offset += len;
 245
 246         proto_tree_add_item(tree, hf_netsync_cmd_nonce, tvb,
 247                                 offset, NETSNYC_MERKLE_HASH_LENGTH, FALSE );
 248         offset += NETSNYC_MERKLE_HASH_LENGTH;
 249
 250         return offset;
 251 }
 252
 253
 254 static gint dissect_netsync_cmd_auth(tvbuff_t *tvb,  gint offset, proto_tree *tree, guint size _U_)
 255 {
 256         guint len = 0;
 257
 258         proto_tree_add_item(tree, hf_netsync_cmd_auth_role, tvb,
 259                                 offset, 1, FALSE );
 260         offset += 1;
 261
 262
 263         offset += dissect_uleb128( tvb, offset, &len );
 264
 265         proto_tree_add_item(tree, hf_netsync_cmd_auth_collection, tvb,
 266                                 offset, len, FALSE );
 267         offset += len;
 268
 269         proto_tree_add_item(tree, hf_netsync_cmd_auth_id, tvb,
 270                                 offset, NETSNYC_MERKLE_HASH_LENGTH, FALSE );
 271         offset += NETSNYC_MERKLE_HASH_LENGTH;
 272
 273         offset += len;
 274
 275         proto_tree_add_item(tree, hf_netsync_cmd_auth_nonce1, tvb,
 276                                 offset, NETSNYC_MERKLE_HASH_LENGTH, FALSE );
 277         offset += NETSNYC_MERKLE_HASH_LENGTH;
 278
 279         offset += len;
 280
 281         proto_tree_add_item(tree, hf_netsync_cmd_auth_nonce2, tvb,
 282                                 offset, NETSNYC_MERKLE_HASH_LENGTH, FALSE );
 283         offset += NETSNYC_MERKLE_HASH_LENGTH;
 284
 285         offset += dissect_uleb128( tvb, offset, &len );
 286
 287         proto_tree_add_item(tree, hf_netsync_cmd_auth_sig, tvb,
 288                                 offset, len, FALSE );
 289         offset += len;
 290
 291         return offset;
 292 }
 293
 294
 295 static gint dissect_netsync_cmd_confirm(tvbuff_t *tvb,  gint offset, proto_tree *tree, guint size _U_)
 296 {
 297         guint len = 0;
 298
 299         offset += dissect_uleb128( tvb, offset, &len );
 300
 301         proto_tree_add_item(tree, hf_netsync_cmd_confirm_sig, tvb,
 302                                 offset, len, FALSE );
 303         offset += len;
 304
 305
 306         return offset;
 307 }
 308
 309
 310 static gint dissect_netsync_cmd_refine(tvbuff_t *tvb,  gint offset, proto_tree *tree, guint size)
 311 {
 312         proto_tree_add_item(tree, hf_netsync_cmd_refine_tree_node, tvb,
 313                                 offset, size, FALSE );
 314         offset += size;
 315
 316         return offset;
 317 }
 318
 319
 320 static gint dissect_netsync_cmd_done(tvbuff_t *tvb,  gint offset, proto_tree *tree, guint size _U_)
 321 {
 322         guint len = 0;
 323         guint bytes = 0;
 324
 325         bytes = dissect_uleb128( tvb, offset, &len );
 326
 327         proto_tree_add_uint(tree, hf_netsync_cmd_done_level, tvb,
 328                                         offset, bytes, len );
 329         offset += bytes;
 330
 331         proto_tree_add_item(tree, hf_netsync_cmd_done_type, tvb,
 332                                 offset, 1, FALSE );
 333         offset += 1;
 334
 335         return offset;
 336 }
 337
 338
 339 static gint dissect_netsync_cmd_send_data(tvbuff_t *tvb,  gint offset, proto_tree *tree, guint size _U_)
 340 {
 341         proto_tree_add_item(tree, hf_netsync_cmd_send_data_type, tvb,
 342                                         offset, 1, FALSE );
 343         offset += 1;
 344
 345         proto_tree_add_item(tree, hf_netsync_cmd_send_data_id, tvb,
 346                                 offset, NETSNYC_MERKLE_HASH_LENGTH, FALSE );
 347         offset += NETSNYC_MERKLE_HASH_LENGTH;
 348
 349         return offset;
 350 }
 351
 352
 353 static gint dissect_netsync_cmd_send_delta(tvbuff_t *tvb,  gint offset, proto_tree *tree, guint size _U_)
 354 {
 355         proto_tree_add_item(tree, hf_netsync_cmd_send_delta_type, tvb,
 356                                         offset, 1, FALSE );
 357         offset += 1;
 358
 359         proto_tree_add_item(tree, hf_netsync_cmd_send_delta_base_id, tvb,
 360                                 offset, NETSNYC_MERKLE_HASH_LENGTH, FALSE );
 361         offset += NETSNYC_MERKLE_HASH_LENGTH;
 362
 363
 364         proto_tree_add_item(tree, hf_netsync_cmd_send_delta_ident_id, tvb,
 365                                 offset, NETSNYC_MERKLE_HASH_LENGTH, FALSE );
 366         offset += NETSNYC_MERKLE_HASH_LENGTH;
 367
 368         return offset;
 369 }
 370
 371
 372 static gint dissect_netsync_cmd_data(tvbuff_t *tvb,  gint offset, proto_tree *tree, guint size _U_)
 373 {
 374         guint len = 0;
 375
 376         proto_tree_add_item(tree, hf_netsync_cmd_data_type, tvb,
 377                                 offset, 1, FALSE );
 378         offset += 1;
 379
 380         proto_tree_add_item(tree, hf_netsync_cmd_data_id, tvb,
 381                                 offset, NETSNYC_MERKLE_HASH_LENGTH, FALSE );
 382         offset += NETSNYC_MERKLE_HASH_LENGTH;
 383
 384         proto_tree_add_item(tree, hf_netsync_cmd_data_compressed, tvb,
 385                                 offset, 1, FALSE );
 386         offset += 1;
 387
 388         offset += dissect_uleb128( tvb, offset, &len );
 389
 390         proto_tree_add_item(tree, hf_netsync_cmd_data_payload, tvb,
 391                                 offset, len, FALSE );
 392         offset += len;
 393
 394         return offset;
 395 }
 396
 397
 398 static gint dissect_netsync_cmd_delta(tvbuff_t *tvb,  gint offset, proto_tree *tree, guint size _U_)
 399 {
 400         guint len = 0;
 401
 402         proto_tree_add_item(tree, hf_netsync_cmd_delta_type, tvb,
 403                                 offset, 1, FALSE );
 404         offset += 1;
 405
 406         proto_tree_add_item(tree, hf_netsync_cmd_delta_base_id, tvb,
 407                                 offset, NETSNYC_MERKLE_HASH_LENGTH, FALSE );
 408         offset += NETSNYC_MERKLE_HASH_LENGTH;
 409
 410         proto_tree_add_item(tree, hf_netsync_cmd_delta_ident_id, tvb,
 411                                 offset, NETSNYC_MERKLE_HASH_LENGTH, FALSE );
 412         offset += NETSNYC_MERKLE_HASH_LENGTH;
 413
 414         proto_tree_add_item(tree, hf_netsync_cmd_delta_compressed, tvb,
 415                                 offset, 1, FALSE );
 416         offset += 1;
 417
 418         offset += dissect_uleb128( tvb, offset, &len );
 419
 420         proto_tree_add_item(tree, hf_netsync_cmd_delta_payload, tvb,
 421                                 offset, len, FALSE );
 422         offset += len;
 423
 424         return offset;
 425 }
 426
 427
 428 static gint dissect_netsync_cmd_nonexistent(tvbuff_t *tvb,  gint offset, proto_tree *tree, guint size _U_)
 429 {
 430         proto_tree_add_item(tree, hf_netsync_cmd_nonexistent_type, tvb,
 431                                 offset, 1, FALSE );
 432         offset += 1;
 433
 434         proto_tree_add_item(tree, hf_netsync_cmd_nonexistent_id, tvb,
 435                                 offset, NETSNYC_MERKLE_HASH_LENGTH, FALSE );
 436         offset += NETSNYC_MERKLE_HASH_LENGTH;
 437
 438         return offset;
 439 }
 440
 441 static guint
 442 get_netsync_pdu_len(packet_info *pinfo _U_, tvbuff_t *tvb, int offset)
 443 {
 444         guint size = 0, size_bytes;
 445
 446         /* skip version and command */
 447         offset += 2;
 448
 449         size_bytes = dissect_uleb128( tvb, offset, &size );
 450
 451         /* the calculated size if for the data only, this doesn't
 452          * include the version (1 byte), command (1 byte),
 453          * length (size_bytes bytes) and checksum (4 bytes)
 454          */
 455
 456         return 1 + 1 + size_bytes + size + 4;
 457 }
 458
 459 static void
 460 dissect_netsync_pdu(tvbuff_t *tvb, packet_info *pinfo, proto_tree *tree)
 461 {
 462         gint offset = 0;
 463         guint8 tmp;
 464         guint8 cmd, version;
 465         guint32 size, size_bytes, shift;
 466         proto_tree *ti,*netsync_tree=NULL;
 467
 468         /* Set the protocol column */
 469         col_set_str(pinfo->cinfo, COL_PROTOCOL, "Netsync");
 470
 471
 472         if (tree == NULL)
 473                 return;
 474
 475         while (tvb_reported_length_remaining(tvb, offset)  > 0) {
 476                 ti = proto_tree_add_item(tree, proto_netsync, tvb, offset, -1, FALSE);
 477                 netsync_tree = proto_item_add_subtree(ti, ett_netsync);
 478
 479                 version = tvb_get_guint8(tvb, offset);
 480                 proto_tree_add_item(netsync_tree, hf_netsync_version, tvb,
 481                                         offset, 1, FALSE );
 482                 offset += 1;
 483
 484                 cmd = tvb_get_guint8(tvb, offset);
 485                 proto_tree_add_item(netsync_tree, hf_netsync_command, tvb,
 486                                         offset, 1, FALSE );
 487                 offset += 1;
 488
 489
 490                 /* get size */
 491                 size = 0;
 492                 size_bytes = 0;
 493                 shift = 0;
 494                 do {
 495                         tmp = tvb_get_guint8(tvb, offset + size_bytes);
 496                         size_bytes += 1;
 497
 498                         size |= (tmp & 0x7F) << shift;
 499                         shift += 7;
 500                 } while (tmp & 0x80);
 501
 502
 503                 proto_tree_add_uint(netsync_tree, hf_netsync_size, tvb,
 504                                         offset, size_bytes, size );
 505                 offset += size_bytes;
 506
 507                 switch (cmd) {
 508                         case NETSYNC_CMD_DONE:
 509                                 dissect_netsync_cmd_done( tvb, offset, netsync_tree, size );
 510                                 break;
 511
 512                         case NETSYNC_CMD_ERROR:
 513                                 dissect_netsync_cmd_error( tvb, offset, netsync_tree, size );
 514                                 break;
 515
 516                         case NETSYNC_CMD_BYE:
 517                                 dissect_netsync_cmd_bye( tvb, offset, netsync_tree, size );
 518                                 break;
 519
 520                         case NETSYNC_CMD_HELLO:
 521                                 dissect_netsync_cmd_hello( tvb, offset, netsync_tree, size );
 522                                 break;
 523
 524                         case NETSYNC_CMD_ANONYMOUS:
 525                                 dissect_netsync_cmd_anonymous( tvb, offset, netsync_tree, size );
 526                                 break;
 527
 528                         case NETSYNC_CMD_AUTH:
 529                                 dissect_netsync_cmd_auth( tvb, offset, netsync_tree, size );
 530                                 break;
 531
 532                         case NETSYNC_CMD_CONFIRM:
 533                                 dissect_netsync_cmd_confirm( tvb, offset, netsync_tree, size );
 534                                 break;
 535
 536                         case NETSYNC_CMD_REFINE:
 537                                 dissect_netsync_cmd_refine( tvb, offset, netsync_tree, size );
 538                                 break;
 539
 540                         case NETSYNC_CMD_SEND_DATA:
 541                                 dissect_netsync_cmd_send_data( tvb, offset, netsync_tree, size );
 542                                 break;
 543
 544                         case NETSYNC_CMD_SEND_DELTA:
 545                                 dissect_netsync_cmd_send_delta( tvb, offset, netsync_tree, size );
 546                                 break;
 547
 548                         case NETSYNC_CMD_DATA:
 549                                 dissect_netsync_cmd_data( tvb, offset, netsync_tree, size );
 550                                 break;
 551
 552                         case NETSYNC_CMD_DELTA:
 553                                 dissect_netsync_cmd_delta( tvb, offset, netsync_tree, size );
 554                                 break;
 555
 556                         case NETSYNC_CMD_NONEXISTENT:
 557                                 dissect_netsync_cmd_nonexistent( tvb, offset, netsync_tree, size );
 558                                 break;
 559
 560                         default:
 561                                 proto_tree_add_item(netsync_tree, hf_netsync_data, tvb,
 562                                         offset, size, FALSE );
 563                                 break;
 564                 }
 565
 566                 offset += size;
 567
 568                 proto_tree_add_item(netsync_tree, hf_netsync_checksum, tvb,
 569                                         offset, 4, FALSE );
 570                 offset += 4;
 571
 572
 573                 proto_item_append_text(netsync_tree, " V%d, Cmd: %s (%d), Size: %d",
 574                                         version, val_to_str(cmd, netsync_cmd_vals, "(0x%x)"), cmd, size );
 575
 576                 proto_item_set_len(netsync_tree, 1+1+size_bytes+size+4);
 577         }
 578 }
 579
 580 static void
 581 dissect_netsync(tvbuff_t *tvb, packet_info *pinfo, proto_tree *tree)
 582 {
 583         tcp_dissect_pdus(tvb, pinfo, tree, netsync_desegment, 7, get_netsync_pdu_len,
 584                                         dissect_netsync_pdu);
 585 }
 586
 587 void
 588 proto_register_netsync(void)
 589 {
 590         static hf_register_info hf[] = {
 591                 /* General */
 592                 { &hf_netsync_version,
 593                         { "Version", "netsync.version",
 594                           FT_UINT8, BASE_DEC, NULL, 0x0,
 595                           NULL, HFILL } },
 596                 { &hf_netsync_command,
 597                         { "Command", "netsync.command",
 598                           FT_UINT8, BASE_HEX, VALS(netsync_cmd_vals), 0x0,
 599                           NULL, HFILL } },
 600                 { &hf_netsync_size,
 601                         { "Size", "netsync.size",
 602                           FT_UINT32, BASE_DEC, NULL, 0x0,
 603                           NULL, HFILL } },
 604                 { &hf_netsync_data,
 605                         { "Data", "netsync.data",
 606                           FT_BYTES, BASE_NONE, NULL, 0x0,
 607                           NULL, HFILL } },
 608                 { &hf_netsync_checksum,
 609                         { "Checksum", "netsync.checksum",
 610                           FT_UINT32, BASE_HEX, NULL, 0x0,
 611                           NULL, HFILL } },
 612                 { &hf_netsync_cmd_hello_keyname,
 613                         { "Key Name", "netsync.cmd.hello.keyname",
 614                           FT_STRING, BASE_NONE, NULL, 0x0,
 615                           NULL, HFILL } },
 616                 { &hf_netsync_cmd_hello_key,
 617                         { "Key", "netsync.cmd.hello.key",
 618                           FT_BYTES, BASE_NONE, NULL, 0x0,
 619                           NULL, HFILL } },
 620                 { &hf_netsync_cmd_nonce,
 621                         { "Nonce", "netsync.cmd.nonce",
 622                           FT_BYTES, BASE_NONE, NULL, 0x0,
 623                           NULL, HFILL } },
 624                 { &hf_netsync_cmd_anonymous_role,
 625                         { "Role", "netsync.cmd.anonymous.role",
 626                           FT_UINT8, BASE_DEC, VALS(netsync_role_vals), 0x0,
 627                           NULL, HFILL } },
 628                 { &hf_netsync_cmd_anonymous_collection,
 629                         { "Collection", "netsync.cmd.anonymous.collection",
 630                           FT_STRING, BASE_NONE, NULL, 0x0,
 631                           NULL, HFILL } },
 632                 { &hf_netsync_cmd_confirm_sig,
 633                         { "Signature", "netsync.cmd.confirm.signature",
 634                           FT_BYTES, BASE_NONE, NULL, 0x0,
 635                           NULL, HFILL } },
 636                 { &hf_netsync_cmd_send_data_type,
 637                         { "Type", "netsync.cmd.send_data.type",
 638                           FT_UINT8, BASE_DEC, NULL, 0x0,
 639                           NULL, HFILL } },
 640                 { &hf_netsync_cmd_send_data_id,
 641                         { "ID", "netsync.cmd.send_data.id",
 642                           FT_BYTES, BASE_NONE, NULL, 0x0,
 643                           NULL, HFILL } },
 644                 { &hf_netsync_cmd_error_msg,
 645                         { "Message", "netsync.cmd.error.msg",
 646                           FT_STRING, BASE_NONE, NULL, 0x0,
 647                           NULL, HFILL } },
 648
 649                 { &hf_netsync_cmd_done_level,
 650                         { "Level", "netsync.cmd.done.level",
 651                           FT_UINT32, BASE_DEC, NULL, 0x0,
 652                           NULL, HFILL } },
 653                 { &hf_netsync_cmd_auth_role,
 654                         { "Role", "netsync.cmd.auth.role",
 655                           FT_UINT8, BASE_DEC, VALS(netsync_role_vals), 0x0,
 656                           NULL, HFILL } },
 657                 { &hf_netsync_cmd_auth_collection,
 658                         { "Collection", "netsync.cmd.auth.collection",
 659                           FT_STRING, BASE_NONE, NULL, 0x0,
 660                           NULL, HFILL } },
 661                 { &hf_netsync_cmd_auth_id,
 662                         { "ID", "netsync.cmd.auth.id",
 663                           FT_BYTES, BASE_NONE, NULL, 0x0,
 664                           NULL, HFILL } },
 665                 { &hf_netsync_cmd_auth_nonce1,
 666                         { "Nonce 1", "netsync.cmd.auth.nonce1",
 667                           FT_BYTES, BASE_NONE, NULL, 0x0,
 668                           NULL, HFILL } },
 669                 { &hf_netsync_cmd_auth_nonce2,
 670                         { "Nonce 2", "netsync.cmd.auth.nonce2",
 671                           FT_BYTES, BASE_NONE, NULL, 0x0,
 672                           NULL, HFILL } },
 673                 { &hf_netsync_cmd_auth_sig,
 674                         { "Signature", "netsync.cmd.auth.sig",
 675                           FT_BYTES, BASE_NONE, NULL, 0x0,
 676                           NULL, HFILL } },
 677                 { &hf_netsync_cmd_data_type,
 678                         { "Type", "netsync.cmd.data.type",
 679                           FT_UINT8, BASE_DEC, NULL, 0x0,
 680                           NULL, HFILL } },
 681                 { &hf_netsync_cmd_data_id,
 682                         { "ID", "netsync.cmd.data.id",
 683                           FT_BYTES, BASE_NONE, NULL, 0x0,
 684                           NULL, HFILL } },
 685                 { &hf_netsync_cmd_data_compressed,
 686                         { "Compressed", "netsync.cmd.data.compressed",
 687                           FT_UINT8, BASE_DEC, NULL, 0x0,
 688                           NULL, HFILL } },
 689                 { &hf_netsync_cmd_data_payload,
 690                         { "Payload", "netsync.cmd.data.payload",
 691                           FT_BYTES, BASE_NONE, NULL, 0x0,
 692                           NULL, HFILL } },
 693                 { &hf_netsync_cmd_delta_type,
 694                         { "Type", "netsync.cmd.delta.type",
 695                           FT_UINT8, BASE_DEC, NULL, 0x0,
 696                           NULL, HFILL } },
 697                 { &hf_netsync_cmd_delta_base_id,
 698                         { "Base ID", "netsync.cmd.delta.base_id",
 699                           FT_BYTES, BASE_NONE, NULL, 0x0,
 700                           NULL, HFILL } },
 701                 { &hf_netsync_cmd_delta_ident_id,
 702                         { "Ident ID", "netsync.cmd.delta.ident_id",
 703                           FT_BYTES, BASE_NONE, NULL, 0x0,
 704                           NULL, HFILL } },
 705                 { &hf_netsync_cmd_delta_compressed,
 706                         { "Compressed", "netsync.cmd.delta.compressed",
 707                           FT_UINT8, BASE_DEC, NULL, 0x0,
 708                           NULL, HFILL } },
 709                 { &hf_netsync_cmd_delta_payload,
 710                         { "Payload", "netsync.cmd.delta.payload",
 711                           FT_BYTES, BASE_NONE, NULL, 0x0,
 712                           NULL, HFILL } },
 713                 { &hf_netsync_cmd_refine_tree_node,
 714                         { "Tree Node", "netsync.cmd.refine.tree_node",
 715                           FT_BYTES, BASE_NONE, NULL, 0x0,
 716                           NULL, HFILL } },
 717                 { &hf_netsync_cmd_send_delta_type,
 718                         { "Type", "netsync.cmd.send_delta.type",
 719                           FT_UINT8, BASE_DEC, NULL, 0x0,
 720                           NULL, HFILL } },
 721                 { &hf_netsync_cmd_send_delta_base_id,
 722                         { "Base ID", "netsync.cmd.send_delta.base_id",
 723                           FT_BYTES, BASE_NONE, NULL, 0x0,
 724                           NULL, HFILL } },
 725                 { &hf_netsync_cmd_send_delta_ident_id,
 726                         { "Ident ID", "netsync.cmd.send_delta.ident_id",
 727                           FT_BYTES, BASE_NONE, NULL, 0x0,
 728                           NULL, HFILL } },
 729                 { &hf_netsync_cmd_nonexistent_id,
 730                         { "ID", "netsync.cmd.nonexistent.id",
 731                           FT_BYTES, BASE_NONE, NULL, 0x0,
 732                           NULL, HFILL } },
 733                 { &hf_netsync_cmd_nonexistent_type,
 734                         { "Type", "netsync.cmd.nonexistent.type",
 735                           FT_UINT8, BASE_DEC, NULL, 0x0,
 736                           NULL, HFILL } },
 737                 { &hf_netsync_cmd_done_type,
 738                         { "Type", "netsync.cmd.done.type",
 739                           FT_UINT8, BASE_DEC, NULL, 0x0,
 740                           NULL, HFILL } }
 741
 742
 743         };
 744
 745         static gint *ett[] = {
 746                 &ett_netsync,
 747         };
 748
 749         module_t *netsync_module;
 750
 751         proto_netsync = proto_register_protocol("Monotone Netsync", "Netsync", "netsync");
 752         proto_register_field_array(proto_netsync, hf, array_length(hf));
 753         proto_register_subtree_array(ett, array_length(ett));
 754
 755         netsync_module = prefs_register_protocol(proto_netsync,
 756                                                 proto_reg_handoff_netsync);
 757
 758         prefs_register_uint_preference(netsync_module, "tcp_port",
 759                                         "Monotone Netsync TCP Port",
 760                                         "The TCP port on which Monotone Netsync packets will be sent",
 761                                         10, &global_tcp_port_netsync);
 762
 763
 764         prefs_register_bool_preference(netsync_module, "desegment_netsync_messages",
 765                 "Reassemble Netsync messages spanning multiple TCP segments",
 766                 "Whether the Netsync dissector should reassemble messages spanning multiple TCP segments."
 767                 " To use this option, you must also enable \"Allow subdissectors to reassemble TCP streams\" in the TCP protocol settings.",
 768                 &netsync_desegment);
 769
 770 }
 771
 772 void
 773 proto_reg_handoff_netsync(void)
 774 {
 775         static dissector_handle_t netsync_handle;
 776         static guint tcp_port_netsync;
 777         static gboolean initialized = FALSE;
 778
 779         if (!initialized) {
 780                 netsync_handle = create_dissector_handle(dissect_netsync, proto_netsync);
 781                 initialized = TRUE;
 782         } else {
 783                 dissector_delete("tcp.port", tcp_port_netsync, netsync_handle);
 784         }
 785
 786         tcp_port_netsync = global_tcp_port_netsync;
 787         dissector_add("tcp.port", global_tcp_port_netsync, netsync_handle);
 788 }
 789