packet-quakeworld.c

   1 /* packet-quakeworld.c
   2  * Routines for QuakeWorld packet dissection
   3  *
   4  * Uwe Girlich <uwe@planetquake.com>
   5  *      http://www.idsoftware.com/q1source/q1source.zip
   6  *
   7  * $Id: packet-quakeworld.c,v 1.13 2002/04/14 23:04:04 guy Exp $
   8  *
   9  * Ethereal - Network traffic analyzer
  10  * By Gerald Combs <gerald@ethereal.com>
  11  * Copyright 1998 Gerald Combs
  12  *
  13  * Copied from packet-quake.c
  14  *
  15  * This program is free software; you can redistribute it and/or
  16  * modify it under the terms of the GNU General Public License
  17  * as published by the Free Software Foundation; either version 2
  18  * of the License, or (at your option) any later version.
  19  *
  20  * This program is distributed in the hope that it will be useful,
  21  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  22  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  23  * GNU General Public License for more details.
  24  *
  25  * You should have received a copy of the GNU General Public License
  26  * along with this program; if not, write to the Free Software
  27  * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA  02111-1307, USA.
  28  */
  29
  30 #ifdef HAVE_CONFIG_H
  31 # include "config.h"
  32 #endif
  33
  34 #ifdef HAVE_SYS_TYPES_H
  35 # include <sys/types.h>
  36 #endif
  37
  38 #include <glib.h>
  39 #include <string.h>
  40 #include <epan/packet.h>
  41 #include "prefs.h"
  42
  43 static int proto_quakeworld = -1;
  44
  45 static int hf_quakeworld_s2c = -1;
  46 static int hf_quakeworld_c2s = -1;
  47 static int hf_quakeworld_connectionless = -1;
  48 static int hf_quakeworld_game = -1;
  49 static int hf_quakeworld_connectionless_marker = -1;
  50 static int hf_quakeworld_connectionless_text = -1;
  51 static int hf_quakeworld_connectionless_command = -1;
  52 static int hf_quakeworld_connectionless_arguments = -1;
  53 static int hf_quakeworld_connectionless_connect_version = -1;
  54 static int hf_quakeworld_connectionless_connect_qport = -1;
  55 static int hf_quakeworld_connectionless_connect_challenge = -1;
  56 static int hf_quakeworld_connectionless_connect_infostring = -1;
  57 static int hf_quakeworld_connectionless_connect_infostring_key_value = -1;
  58 static int hf_quakeworld_connectionless_connect_infostring_key = -1;
  59 static int hf_quakeworld_connectionless_connect_infostring_value = -1;
  60 static int hf_quakeworld_connectionless_rcon_password = -1;
  61 static int hf_quakeworld_connectionless_rcon_command = -1;
  62 static int hf_quakeworld_game_seq1 = -1;
  63 static int hf_quakeworld_game_rel1 = -1;
  64 static int hf_quakeworld_game_seq2 = -1;
  65 static int hf_quakeworld_game_rel2 = -1;
  66 static int hf_quakeworld_game_qport = -1;
  67
  68 static gint ett_quakeworld = -1;
  69 static gint ett_quakeworld_connectionless = -1;
  70 static gint ett_quakeworld_connectionless_text = -1;
  71 static gint ett_quakeworld_connectionless_arguments = -1;
  72 static gint ett_quakeworld_connectionless_connect_infostring = -1;
  73 static gint ett_quakeworld_connectionless_connect_infostring_key_value = -1;
  74 static gint ett_quakeworld_game = -1;
  75 static gint ett_quakeworld_game_seq1 = -1;
  76 static gint ett_quakeworld_game_seq2 = -1;
  77 static gint ett_quakeworld_game_clc = -1;
  78 static gint ett_quakeworld_game_svc = -1;
  79
  80 static dissector_handle_t data_handle;
  81
  82 /*
  83    helper functions, they may ave to go somewhere else
  84    they are mostly copied without change from
  85         quakeworldsource/client/cmd.c
  86         quakeworldsource/client/common.c
  87 */
  88
  89 static  char            com_token[1024];
  90 static  int             com_token_start;
  91 static  int             com_token_length;
  92
  93 static char *
  94 COM_Parse (char *data)
  95 {
  96         int     c;
  97         int     len;
  98
  99         len = 0;
 100         com_token[0] = 0;
 101         com_token_start = 0;
 102         com_token_length = 0;
 103
 104         if (data == NULL)
 105                 return NULL;
 106
 107         /* skip whitespace */
 108 skipwhite:
 109         while ( (c = *data) <= ' ') {
 110                 if (c == 0)
 111                         return NULL;    /* end of file; */
 112                 data++;
 113                 com_token_start++;
 114         }
 115
 116         /* skip // comments */
 117         if (c=='/' && data[1] == '/') {
 118                 while (*data && *data != '\n')
 119                         data++;
 120                         com_token_start++;
 121                 goto skipwhite;
 122         }
 123
 124         /* handle quoted strings specially */
 125         if (c == '\"') {
 126                 data++;
 127                 com_token_start++;
 128                 while (1) {
 129                         c = *data++;
 130                         if (c=='\"' || c==0) {
 131                                 com_token[len] = 0;
 132                                 return data;
 133                         }
 134                         com_token[len] = c;
 135                         len++;
 136                         com_token_length++;
 137                 }
 138         }
 139
 140         /* parse a regular word */
 141         do {
 142                 com_token[len] = c;
 143                 data++;
 144                 len++;
 145                 com_token_length++;
 146                 c = *data;
 147         } while (c>32);
 148
 149         com_token[len] = 0;
 150         return data;
 151 }
 152
 153
 154 #define                 MAX_ARGS 80
 155 static  int             cmd_argc = 0;
 156 static  char            *cmd_argv[MAX_ARGS];
 157 static  char            *cmd_null_string = "";
 158 static  int             cmd_argv_start[MAX_ARGS];
 159 static  int             cmd_argv_length[MAX_ARGS];
 160
 161
 162
 163 static int
 164 Cmd_Argc(void)
 165 {
 166         return cmd_argc;
 167 }
 168
 169
 170 static char*
 171 Cmd_Argv(int arg)
 172 {
 173         if ( arg >= cmd_argc )
 174                 return cmd_null_string;
 175         return cmd_argv[arg];
 176 }
 177
 178
 179 static int
 180 Cmd_Argv_start(int arg)
 181 {
 182         if ( arg >= cmd_argc )
 183                 return 0;
 184         return cmd_argv_start[arg];
 185 }
 186
 187
 188 static int
 189 Cmd_Argv_length(int arg)
 190 {
 191         if ( arg >= cmd_argc )
 192                 return 0;
 193         return cmd_argv_length[arg];
 194 }
 195
 196
 197 static void
 198 Cmd_TokenizeString(char* text)
 199 {
 200         int i;
 201         int start;
 202         int length;
 203
 204
 205         /* clear the args from the last string */
 206         for (i=0 ; i<cmd_argc ; i++)
 207                 g_free(cmd_argv[i]);
 208
 209         cmd_argc = 0;
 210
 211         start = 0;
 212         while (TRUE) {
 213
 214                 /* skip whitespace up to a \n */
 215                 while (*text && *text <= ' ' && *text != '\n') {
 216                         text++;
 217                         start++;
 218                 }
 219
 220                 length = 0;
 221
 222                 if (*text == '\n') {
 223                         /* a newline seperates commands in the buffer */
 224                         text++;
 225                         break;
 226                 }
 227
 228                 if (!*text)
 229                         return;
 230
 231                 text = COM_Parse (text);
 232                 if (!text)
 233                         return;
 234
 235                 if (cmd_argc < MAX_ARGS) {
 236                         cmd_argv[cmd_argc] = g_strdup(com_token);
 237                         cmd_argv_start[cmd_argc] = start + com_token_start;
 238                         cmd_argv_length[cmd_argc] = com_token_length;
 239                         cmd_argc++;
 240                 }
 241
 242                 start += com_token_start + com_token_length;
 243         }
 244 }
 245
 246
 247 static void
 248 dissect_id_infostring(tvbuff_t *tvb, proto_tree* tree,
 249         int offset, char* infostring,
 250         gint ett_key_value, int hf_key_value, int hf_key, int hf_value)
 251 {
 252         char * newpos = infostring;
 253         int end_of_info = FALSE;
 254
 255         /* to look at all the key/value pairs, we destroy infostring */
 256         while(!end_of_info) {
 257                 char* keypos;
 258                 char* valuepos;
 259                 int keylength;
 260                 char* keyvaluesep;
 261                 int valuelength;
 262                 char* valueend;
 263
 264                 keypos = newpos;
 265                 if (*keypos == 0) break;
 266                 if (*keypos == '\\') keypos++;
 267
 268                 for (keylength = 0
 269                         ;
 270                         *(keypos + keylength) != '\\' &&
 271                         *(keypos + keylength) != 0
 272                         ;
 273                         keylength++) ;
 274                 keyvaluesep = keypos + keylength;
 275                 if (*keyvaluesep == 0) break;
 276                 valuepos = keyvaluesep+1;
 277                 for (valuelength = 0
 278                         ;
 279                         *(valuepos + valuelength) != '\\' &&
 280                         *(valuepos + valuelength) != 0
 281                         ;
 282                         valuelength++) ;
 283                 valueend = valuepos + valuelength;
 284                 if (*valueend == 0) {
 285                         end_of_info = TRUE;
 286                 }
 287                 *(keyvaluesep) = '=';
 288                 *(valueend) = 0;
 289
 290                 if (tree) {
 291                         proto_item* sub_item = NULL;
 292                         proto_tree* sub_tree = NULL;
 293
 294                         sub_item = proto_tree_add_string(tree,
 295                                 hf_key_value,
 296                                 tvb,
 297                                 offset + (keypos-infostring),
 298                                 keylength + 1 + valuelength, keypos);
 299                         if (sub_item)
 300                                 sub_tree =
 301                                         proto_item_add_subtree(
 302                                         sub_item,
 303                                         ett_key_value);
 304                         *(keyvaluesep) = 0;
 305                         if (sub_tree) {
 306                                 proto_tree_add_string(sub_tree,
 307                                         hf_key,
 308                                         tvb,
 309                                         offset + (keypos-infostring),
 310                                         keylength, keypos);
 311                                 proto_tree_add_string(sub_tree,
 312                                         hf_value,
 313                                         tvb,
 314                                         offset + (valuepos-infostring),
 315                                         valuelength, valuepos);
 316                         }
 317                 }
 318                 newpos = valueend + 1;
 319         }
 320 }
 321
 322
 323 static const value_string names_direction[] = {
 324 #define DIR_C2S 0
 325         { DIR_C2S, "Client to Server" },
 326 #define DIR_S2C 1
 327         { DIR_S2C, "Server to Client" },
 328         { 0, NULL }
 329 };
 330
 331
 332 /* I took this name and value directly out of the QW source. */
 333 #define PORT_MASTER 27500
 334 static unsigned int gbl_quakeworldServerPort=PORT_MASTER;
 335
 336
 337 /* out of band message id bytes (taken out of quakeworldsource/client/protocol.h */
 338
 339 /* M = master, S = server, C = client, A = any */
 340 /* the second character will allways be \n if the message isn't a single */
 341 /* byte long (?? not true anymore?) */
 342
 343 #define S2C_CHALLENGE           'c'
 344 #define S2C_CONNECTION          'j'
 345 #define A2A_PING                'k'     /* respond with an A2A_ACK */
 346 #define A2A_ACK                 'l'     /* general acknowledgement without info */
 347 #define A2A_NACK                'm'     /* [+ comment] general failure */
 348 #define A2A_ECHO                'e'     /* for echoing */
 349 #define A2C_PRINT               'n'     /* print a message on client */
 350
 351 #define S2M_HEARTBEAT           'a'     /* + serverinfo + userlist + fraglist */
 352 #define A2C_CLIENT_COMMAND      'B'     /* + command line */
 353 #define S2M_SHUTDOWN            'C'
 354
 355
 356 static void
 357 dissect_quakeworld_ConnectionlessPacket(tvbuff_t *tvb, packet_info *pinfo,
 358         proto_tree *tree, int direction)
 359 {
 360         proto_tree      *cl_tree = NULL;
 361         proto_item      *cl_item = NULL;
 362         proto_item      *text_item = NULL;
 363         proto_tree      *text_tree = NULL;
 364         guint8          text[2048];
 365         int             maxbufsize = 0;
 366         int             len;
 367         int             offset;
 368         guint32 marker;
 369         int command_len;
 370         char command[2048];
 371         int command_finished = FALSE;
 372
 373         marker = tvb_get_ntohl(tvb, 0);
 374         if (tree) {
 375                 cl_item = proto_tree_add_text(tree, tvb,
 376                                 0, -1, "Connectionless");
 377                 if (cl_item)
 378                         cl_tree = proto_item_add_subtree(
 379                                 cl_item, ett_quakeworld_connectionless);
 380         }
 381
 382         if (cl_tree) {
 383                 proto_tree_add_uint(cl_tree, hf_quakeworld_connectionless_marker,
 384                                 tvb, 0, 4, marker);
 385         }
 386
 387         /* all the rest of the packet is just text */
 388         offset = 4;
 389
 390         maxbufsize = MIN((gint)sizeof(text), tvb_length_remaining(tvb, offset));
 391         len = tvb_get_nstringz0(tvb, offset, maxbufsize, text);
 392         /* actually, we should look for a eol char and stop already there */
 393
 394         if (cl_tree) {
 395                 text_item = proto_tree_add_string(cl_tree, hf_quakeworld_connectionless_text,
 396                         tvb, offset, len + 1, text);
 397                 if (text_item) {
 398                         text_tree = proto_item_add_subtree(
 399                                 text_item, ett_quakeworld_connectionless_text);
 400                 }
 401         }
 402
 403         if (direction == DIR_C2S) {
 404                 /* client to sever commands */
 405                 char *c;
 406
 407                 Cmd_TokenizeString(text);
 408                 c = Cmd_Argv(0);
 409
 410                 /* client to sever commands */
 411                 if (strcmp(c,"ping") == 0) {
 412                         strcpy(command, "Ping");
 413                         command_len = 4;
 414                 } else if (strcmp(c,"status") == 0) {
 415                         strcpy(command, "Status");
 416                         command_len = 6;
 417                 } else if (strcmp(c,"log") == 0) {
 418                         strcpy(command, "Status");
 419                         command_len = 3;
 420                 } else if (strcmp(c,"connect") == 0) {
 421                         int version;
 422                         int qport;
 423                         int challenge;
 424                         char *infostring;
 425                         proto_item *argument_item = NULL;
 426                         proto_tree *argument_tree = NULL;
 427                         proto_item *info_item = NULL;
 428                         proto_tree *info_tree = NULL;
 429                         strcpy(command, "Connect");
 430                         command_len = Cmd_Argv_length(0);
 431                         if (text_tree) {
 432                                 proto_tree_add_string(text_tree, hf_quakeworld_connectionless_command,
 433                                         tvb, offset, command_len, command);
 434                                 argument_item = proto_tree_add_string(text_tree,
 435                                         hf_quakeworld_connectionless_arguments,
 436                                         tvb, offset + Cmd_Argv_start(1), len + 1 - Cmd_Argv_start(1),
 437                                         text + Cmd_Argv_start(1));
 438                                 if (argument_item) {
 439                                         argument_tree =
 440                                                 proto_item_add_subtree(argument_item,
 441                                                         ett_quakeworld_connectionless_arguments);
 442                                 }
 443                                 command_finished=TRUE;
 444                         }
 445                         version = atoi(Cmd_Argv(1));
 446                         qport = atoi(Cmd_Argv(2));
 447                         challenge = atoi(Cmd_Argv(3));
 448                         infostring = Cmd_Argv(4);
 449                         if (argument_tree) {
 450                                 proto_tree_add_uint(argument_tree,
 451                                         hf_quakeworld_connectionless_connect_version,
 452                                         tvb,
 453                                         offset + Cmd_Argv_start(1),
 454                                         Cmd_Argv_length(1), version);
 455                                 proto_tree_add_uint(argument_tree,
 456                                         hf_quakeworld_connectionless_connect_qport,
 457                                         tvb,
 458                                         offset + Cmd_Argv_start(2),
 459                                         Cmd_Argv_length(2), qport);
 460                                 proto_tree_add_int(argument_tree,
 461                                         hf_quakeworld_connectionless_connect_challenge,
 462                                         tvb,
 463                                         offset + Cmd_Argv_start(3),
 464                                         Cmd_Argv_length(3), challenge);
 465                                 info_item = proto_tree_add_string(argument_tree,
 466                                         hf_quakeworld_connectionless_connect_infostring,
 467                                         tvb,
 468                                         offset + Cmd_Argv_start(4),
 469                                         Cmd_Argv_length(4), infostring);
 470                                 if (info_item)
 471                                         info_tree = proto_item_add_subtree(
 472                                                 info_item, ett_quakeworld_connectionless_connect_infostring);
 473                                 dissect_id_infostring(tvb, info_tree, offset + Cmd_Argv_start(4),
 474                                         infostring,
 475                                         ett_quakeworld_connectionless_connect_infostring_key_value,
 476                                         hf_quakeworld_connectionless_connect_infostring_key_value,
 477                                         hf_quakeworld_connectionless_connect_infostring_key,
 478                                         hf_quakeworld_connectionless_connect_infostring_value);
 479                         }
 480                 } else if (strcmp(c,"getchallenge") == 0) {
 481                         strcpy(command, "Get Challenge");
 482                         command_len = Cmd_Argv_length(0);
 483                 } else if (strcmp(c,"rcon") == 0) {
 484                         char* password;
 485                         int i;
 486                         char remaining[1024];
 487                         proto_item *argument_item = NULL;
 488                         proto_tree *argument_tree = NULL;
 489                         strcpy(command, "Remote Command");
 490                         command_len = Cmd_Argv_length(0);
 491                         if (text_tree) {
 492                                 proto_tree_add_string(text_tree, hf_quakeworld_connectionless_command,
 493                                         tvb, offset, command_len, command);
 494                                 argument_item = proto_tree_add_string(text_tree,
 495                                         hf_quakeworld_connectionless_arguments,
 496                                         tvb, offset + Cmd_Argv_start(1), len + 1 - Cmd_Argv_start(1),
 497                                         text + Cmd_Argv_start(1));
 498                                 if (argument_item) {
 499                                         argument_tree =
 500                                                 proto_item_add_subtree(argument_item,
 501                                                         ett_quakeworld_connectionless_arguments);
 502                                 }
 503                                 command_finished=TRUE;
 504                         }
 505                         password = Cmd_Argv(1);
 506                         if (argument_tree) {
 507                                 proto_tree_add_string(argument_tree,
 508                                         hf_quakeworld_connectionless_rcon_password,
 509                                         tvb,
 510                                         offset + Cmd_Argv_start(1),
 511                                         Cmd_Argv_length(1), password);
 512                         }
 513                         for (i=2; i<Cmd_Argc() ; i++) {
 514                                 remaining[0] = 0;
 515                                 strcat (remaining, Cmd_Argv(i) );
 516                                 strcat (remaining, " ");
 517                         }
 518                         if (text_tree) {
 519                                 proto_tree_add_string(argument_tree,
 520                                         hf_quakeworld_connectionless_rcon_command,
 521                                         tvb, offset + Cmd_Argv_start(2),
 522                                         Cmd_Argv_start(Cmd_Argc()-1) + Cmd_Argv_length(Cmd_Argc()-1) -
 523                                         Cmd_Argv_start(2),
 524                                         remaining);
 525                         }
 526                 } else if (c[0]==A2A_PING && ( c[1]==0 || c[1]=='\n')) {
 527                         strcpy(command, "Ping");
 528                         command_len = 1;
 529                 } else if (c[0]==A2A_ACK && ( c[1]==0 || c[1]=='\n')) {
 530                         strcpy(command, "Ack");
 531                         command_len = 1;
 532                 } else {
 533                         strcpy(command, "Unknown");
 534                         command_len = len;
 535                 }
 536         }
 537         else {
 538                 /* server to client commands */
 539                 if (text[0] == S2C_CONNECTION) {
 540                         strcpy(command, "Connected");
 541                         command_len = 1;
 542                 } else if (text[0] == A2C_CLIENT_COMMAND) {
 543                         strcpy(command, "Client Command");
 544                         command_len = 1;
 545                         /* stringz (command), stringz (localid) */
 546                 } else if (text[0] == A2C_PRINT) {
 547                         strcpy(command, "Print");
 548                         command_len = 1;
 549                         /* string */
 550                 } else if (text[0] == A2A_PING) {
 551                         strcpy(command, "Ping");
 552                         command_len = 1;
 553                 } else if (text[0] == S2C_CHALLENGE) {
 554                         strcpy(command, "Challenge");
 555                         command_len = 1;
 556                         /* string, atoi */
 557                 } else {
 558                         strcpy(command, "Unknown");
 559                         command_len = len;
 560                 }
 561         }
 562
 563         if (check_col(pinfo->cinfo, COL_INFO)) {
 564                 col_append_fstr(pinfo->cinfo, COL_INFO, " %s", command);
 565         }
 566
 567         if (text_tree && !command_finished) {
 568                 proto_tree_add_string(text_tree, hf_quakeworld_connectionless_command,
 569                         tvb, offset, command_len, command);
 570         }
 571         offset += len + 1;
 572 }
 573
 574
 575 static void
 576 dissect_quakeworld_client_commands(tvbuff_t *tvb, packet_info *pinfo,
 577         proto_tree *tree)
 578 {
 579         /* If I have too much time at hand, I'll fill it with all
 580            the information from my QWD specs:
 581                 http://www.planetquake.com/demospecs/qwd/
 582         */
 583         call_dissector(data_handle,tvb, pinfo, tree);
 584 }
 585
 586
 587 static void
 588 dissect_quakeworld_server_commands(tvbuff_t *tvb, packet_info *pinfo,
 589         proto_tree *tree)
 590 {
 591         /* If I have too much time at hand, I'll fill it with all
 592            the information from my QWD specs:
 593                 http://www.planetquake.com/demospecs/qwd/
 594         */
 595         call_dissector(data_handle,tvb, pinfo, tree);
 596 }
 597
 598
 599 static const value_string names_reliable[] = {
 600         { 0, "Non Reliable" },
 601         { 1, "Reliable" },
 602         { 0, NULL }
 603 };
 604
 605
 606 static void
 607 dissect_quakeworld_GamePacket(tvbuff_t *tvb, packet_info *pinfo,
 608         proto_tree *tree, int direction)
 609 {
 610         proto_tree      *game_tree = NULL;
 611         proto_item      *game_item = NULL;
 612         guint32 seq1;
 613         guint32 seq2;
 614         int rel1;
 615         int rel2;
 616         int offset;
 617         guint           rest_length;
 618
 619         direction = (pinfo->destport == gbl_quakeworldServerPort) ?
 620                         DIR_C2S : DIR_S2C;
 621
 622         if (tree) {
 623                 game_item = proto_tree_add_text(tree, tvb,
 624                                 0, -1, "Game");
 625                 if (game_item)
 626                         game_tree = proto_item_add_subtree(
 627                                 game_item, ett_quakeworld_game);
 628         }
 629
 630         offset = 0;
 631
 632         seq1 = tvb_get_letohl(tvb, offset);
 633         rel1 = seq1 & 0x80000000 ? 1 : 0;
 634         seq1 &= ~0x80000000;
 635         if (game_tree) {
 636                 proto_item *seq1_item = proto_tree_add_text(game_tree,
 637                         tvb, offset, 4, "Current Sequence: %u (%s)",
 638                         seq1, val_to_str(rel1,names_reliable,"%u"));
 639                 if (seq1_item) {
 640                         proto_tree *seq1_tree = proto_item_add_subtree(
 641                                 seq1_item, ett_quakeworld_game_seq1);
 642                         proto_tree_add_uint(seq1_tree, hf_quakeworld_game_seq1,
 643                                         tvb, offset, 4, seq1);
 644                         proto_tree_add_boolean(seq1_tree, hf_quakeworld_game_rel1,
 645                                         tvb, offset+3, 1, rel1);
 646                 }
 647         }
 648         offset += 4;
 649
 650         seq2 = tvb_get_letohl(tvb, offset);
 651         rel2 = seq2 & 0x80000000 ? 1 : 0;
 652         seq2 &= ~0x80000000;
 653         if (game_tree) {
 654                 proto_item *seq2_item = proto_tree_add_text(game_tree,
 655                         tvb, offset, 4, "Acknowledge Sequence: %u (%s)",
 656                         seq2, val_to_str(rel2,names_reliable,"%u"));;
 657                 if (seq2_item) {
 658                         proto_tree *seq2_tree = proto_item_add_subtree(
 659                                 seq2_item, ett_quakeworld_game_seq2);
 660                         proto_tree_add_uint(seq2_tree, hf_quakeworld_game_seq2,
 661                                         tvb, offset, 4, seq2);
 662                         proto_tree_add_boolean(seq2_tree, hf_quakeworld_game_rel2,
 663                                         tvb, offset+3, 1, rel2);
 664                 }
 665         }
 666         offset += 4;
 667
 668         if (direction == DIR_C2S) {
 669                 /* client to server */
 670                 guint16 qport = tvb_get_letohs(tvb, offset);
 671                 if (game_tree) {
 672                         proto_tree_add_uint(game_tree, hf_quakeworld_game_qport,
 673                                 tvb, offset, 2, qport);
 674                 }
 675                 offset +=2;
 676         }
 677
 678         /* all the rest is pure game data */
 679         rest_length = tvb_reported_length(tvb) - offset;
 680         if (rest_length) {
 681                 tvbuff_t *next_tvb =
 682                 tvb_new_subset(tvb, offset, rest_length , rest_length);
 683
 684                 if (direction == DIR_C2S) {
 685                         proto_item *c_item = NULL;
 686                         proto_tree *c_tree = NULL;
 687                         if (tree) {
 688                                 c_item = proto_tree_add_text(game_tree, next_tvb,
 689                                 0, -1, "Client Commands");
 690                                 if (c_item) {
 691                                         c_tree = proto_item_add_subtree(
 692                                                 c_item, ett_quakeworld_game_clc);
 693                                 }
 694                         }
 695                         dissect_quakeworld_client_commands(next_tvb, pinfo, c_tree);
 696                 }
 697                 else {
 698                         proto_item *c_item = NULL;
 699                         proto_tree *c_tree = NULL;
 700                         if (tree) {
 701                                 c_item = proto_tree_add_text(game_tree, next_tvb,
 702                                 0, -1, "Server Commands");
 703                                 if (c_item) {
 704                                         c_tree = proto_item_add_subtree(
 705                                         c_item, ett_quakeworld_game_svc);
 706                                 }
 707                         }
 708                         dissect_quakeworld_server_commands(next_tvb, pinfo, c_tree);
 709                 }
 710         }
 711 }
 712
 713
 714 static void
 715 dissect_quakeworld(tvbuff_t *tvb, packet_info *pinfo, proto_tree *tree)
 716 {
 717         proto_tree      *quakeworld_tree = NULL;
 718         proto_item      *quakeworld_item = NULL;
 719         int             direction;
 720
 721         direction = (pinfo->destport == gbl_quakeworldServerPort) ?
 722                         DIR_C2S : DIR_S2C;
 723
 724         if (check_col(pinfo->cinfo, COL_PROTOCOL))
 725                 col_set_str(pinfo->cinfo, COL_PROTOCOL, "QUAKEWORLD");
 726         if (check_col(pinfo->cinfo, COL_INFO))
 727                 col_set_str(pinfo->cinfo, COL_INFO, val_to_str(direction,
 728                         names_direction, "%u"));
 729
 730         if (tree) {
 731                 quakeworld_item = proto_tree_add_item(tree, proto_quakeworld,
 732                                 tvb, 0, -1, FALSE);
 733                 if (quakeworld_item)
 734                         quakeworld_tree = proto_item_add_subtree(
 735                                 quakeworld_item, ett_quakeworld);
 736                         if (quakeworld_tree) {
 737                                 proto_tree_add_uint_format(quakeworld_tree,
 738                                         direction == DIR_S2C ?
 739                                         hf_quakeworld_s2c :
 740                                         hf_quakeworld_c2s,
 741                                         tvb, 0, 0, 1,
 742                                         "Direction: %s", val_to_str(direction, names_direction, "%u"));
 743                         }
 744         }
 745
 746         if (tvb_get_ntohl(tvb, 0) == 0xffffffff) {
 747                 if (check_col(pinfo->cinfo, COL_INFO)) {
 748                         col_append_str(pinfo->cinfo, COL_INFO, " Connectionless");
 749                 }
 750                 if (quakeworld_tree)
 751                         proto_tree_add_uint_format(quakeworld_tree,
 752                                 hf_quakeworld_connectionless,
 753                                 tvb, 0, 0, 1,
 754                                 "Type: Connectionless");
 755                 dissect_quakeworld_ConnectionlessPacket(
 756                         tvb, pinfo, quakeworld_tree, direction);
 757         }
 758         else {
 759                 if (check_col(pinfo->cinfo, COL_INFO)) {
 760                         col_append_str(pinfo->cinfo, COL_INFO, " Game");
 761                 }
 762                 if (quakeworld_tree)
 763                         proto_tree_add_uint_format(quakeworld_tree,
 764                                 hf_quakeworld_game,
 765                                 tvb, 0, 0, 1,
 766                                 "Type: Game");
 767                 dissect_quakeworld_GamePacket(
 768                         tvb, pinfo, quakeworld_tree, direction);
 769         }
 770 }
 771
 772
 773 void
 774 proto_reg_handoff_quakeworld(void)
 775 {
 776         static int Initialized=FALSE;
 777         static dissector_handle_t quakeworld_handle;
 778         static int ServerPort=0;
 779
 780         if (!Initialized) {
 781                 quakeworld_handle = create_dissector_handle(dissect_quakeworld,
 782                                 proto_quakeworld);
 783                 Initialized=TRUE;
 784         } else {
 785                 dissector_delete("udp.port", ServerPort, quakeworld_handle);
 786         }
 787
 788         /* set port for future deletes */
 789         ServerPort=gbl_quakeworldServerPort;
 790
 791         dissector_add("udp.port", gbl_quakeworldServerPort, quakeworld_handle);
 792         data_handle = find_dissector("data");
 793 }
 794
 795
 796 void
 797 proto_register_quakeworld(void)
 798 {
 799         static hf_register_info hf[] = {
 800                 { &hf_quakeworld_c2s,
 801                         { "Client to Server", "quakeworld.c2s",
 802                         FT_UINT32, BASE_DEC, NULL, 0x0,
 803                         "Client to Server", HFILL }},
 804                 { &hf_quakeworld_s2c,
 805                         { "Server to Client", "quakeworld.s2c",
 806                         FT_UINT32, BASE_DEC, NULL, 0x0,
 807                         "Server to Client", HFILL }},
 808                 { &hf_quakeworld_connectionless,
 809                         { "Connectionless", "quakeworld.connectionless",
 810                         FT_UINT32, BASE_DEC, NULL, 0x0,
 811                         "Connectionless", HFILL }},
 812                 { &hf_quakeworld_game,
 813                         { "Game", "quakeworld.game",
 814                         FT_UINT32, BASE_DEC, NULL, 0x0,
 815                         "Game", HFILL }},
 816                 { &hf_quakeworld_connectionless_marker,
 817                         { "Marker", "quakeworld.connectionless.marker",
 818                         FT_UINT32, BASE_HEX, NULL, 0x0,
 819                         "Marker", HFILL }},
 820                 { &hf_quakeworld_connectionless_text,
 821                         { "Text", "quakeworld.connectionless.text",
 822                         FT_STRING, BASE_DEC, NULL, 0x0,
 823                         "Text", HFILL }},
 824                 { &hf_quakeworld_connectionless_command,
 825                         { "Command", "quakeworld.connectionless.command",
 826                         FT_STRING, BASE_DEC, NULL, 0x0,
 827                         "Command", HFILL }},
 828                 { &hf_quakeworld_connectionless_arguments,
 829                         { "Arguments", "quakeworld.connectionless.arguments",
 830                         FT_STRING, BASE_DEC, NULL, 0x0,
 831                         "Arguments", HFILL }},
 832                 { &hf_quakeworld_connectionless_connect_version,
 833                         { "Version", "quakeworld.connectionless.connect.version",
 834                         FT_UINT32, BASE_DEC, NULL, 0x0,
 835                         "Protocol Version", HFILL }},
 836                 { &hf_quakeworld_connectionless_connect_qport,
 837                         { "QPort", "quakeworld.connectionless.connect.qport",
 838                         FT_UINT32, BASE_DEC, NULL, 0x0,
 839                         "QPort of the client", HFILL }},
 840                 { &hf_quakeworld_connectionless_connect_challenge,
 841                         { "Challenge", "quakeworld.connectionless.connect.challenge",
 842                         FT_INT32, BASE_DEC, NULL, 0x0,
 843                         "Challenge from the server", HFILL }},
 844                 { &hf_quakeworld_connectionless_connect_infostring,
 845                         { "Infostring", "quakeworld.connectionless.connect.infostring",
 846                         FT_STRING, BASE_DEC, NULL, 0x0,
 847                         "Infostring with additional variables", HFILL }},
 848                 { &hf_quakeworld_connectionless_connect_infostring_key_value,
 849                         { "Key/Value", "quakeworld.connectionless.connect.infostring.key_value",
 850                         FT_STRING, BASE_DEC, NULL, 0x0,
 851                         "Key and Value", HFILL }},
 852                 { &hf_quakeworld_connectionless_connect_infostring_key,
 853                         { "Key", "quakeworld.connectionless.connect.infostring.key",
 854                         FT_STRING, BASE_DEC, NULL, 0x0,
 855                         "Infostring Key", HFILL }},
 856                 { &hf_quakeworld_connectionless_connect_infostring_value,
 857                         { "Value", "quakeworld.connectionless.connect.infostring.value",
 858                         FT_STRING, BASE_DEC, NULL, 0x0,
 859                         "Infostring Value", HFILL }},
 860                 { &hf_quakeworld_connectionless_rcon_password,
 861                         { "Password", "quakeworld.connectionless.rcon.password",
 862                         FT_STRING, BASE_DEC, NULL, 0x0,
 863                         "Rcon Password", HFILL }},
 864                 { &hf_quakeworld_connectionless_rcon_command,
 865                         { "Command", "quakeworld.connectionless.rcon.command",
 866                         FT_STRING, BASE_DEC, NULL, 0x0,
 867                         "Command", HFILL }},
 868                 { &hf_quakeworld_game_seq1,
 869                         { "Sequence Number", "quakeworld.game.seq1",
 870                         FT_UINT32, BASE_DEC, NULL, 0x0,
 871                         "Sequence number of the current packet", HFILL }},
 872                 { &hf_quakeworld_game_rel1,
 873                         { "Reliable", "quakeworld.game.rel1",
 874                         FT_BOOLEAN, BASE_DEC, NULL, 0x0,
 875                         "Packet is reliable and may be retransmitted", HFILL }},
 876                 { &hf_quakeworld_game_seq2,
 877                         { "Sequence Number", "quakeworld.game.seq2",
 878                         FT_UINT32, BASE_DEC, NULL, 0x0,
 879                         "Sequence number of the last received packet", HFILL }},
 880                 { &hf_quakeworld_game_rel2,
 881                         { "Reliable", "quakeworld.game.rel2",
 882                         FT_BOOLEAN, BASE_DEC, NULL, 0x0,
 883                         "Packet was reliable and may be retransmitted", HFILL }},
 884                 { &hf_quakeworld_game_qport,
 885                         { "QPort", "quakeworld.game.qport",
 886                         FT_UINT32, BASE_DEC, NULL, 0x0,
 887                         "QuakeWorld Client Port", HFILL }}
 888         };
 889         static gint *ett[] = {
 890                 &ett_quakeworld,
 891                 &ett_quakeworld_connectionless,
 892                 &ett_quakeworld_connectionless_text,
 893                 &ett_quakeworld_connectionless_arguments,
 894                 &ett_quakeworld_connectionless_connect_infostring,
 895                 &ett_quakeworld_connectionless_connect_infostring_key_value,
 896                 &ett_quakeworld_game,
 897                 &ett_quakeworld_game_seq1,
 898                 &ett_quakeworld_game_seq2,
 899                 &ett_quakeworld_game_clc,
 900                 &ett_quakeworld_game_svc
 901         };
 902         module_t *quakeworld_module;
 903
 904         proto_quakeworld = proto_register_protocol("QuakeWorld Network Protocol",
 905                                                 "QUAKEWORLD", "quakeworld");
 906         proto_register_field_array(proto_quakeworld, hf, array_length(hf));
 907         proto_register_subtree_array(ett, array_length(ett));
 908
 909         /* Register a configuration option for port */
 910         quakeworld_module = prefs_register_protocol(proto_quakeworld,
 911                 proto_reg_handoff_quakeworld);
 912         prefs_register_uint_preference(quakeworld_module, "udp.port",
 913                                         "QuakeWorld Server UDP Port",
 914                                         "Set the UDP port for the QuakeWorld Server",
 915                                         10, &gbl_quakeworldServerPort);
 916 }
 917