src/network.c

   1 // ============================================================================
   2 // Rocks'n'Diamonds - McDuffin Strikes Back!
   3 // ----------------------------------------------------------------------------
   4 // (c) 1995-2014 by Artsoft Entertainment
   5 //                  Holger Schemel
   6 //                  info@artsoft.org
   7 //                  http://www.artsoft.org/
   8 // ----------------------------------------------------------------------------
   9 // network.c
  10 // ============================================================================
  11
  12 #include <signal.h>
  13 #include <sys/time.h>
  14
  15 #include "libgame/libgame.h"
  16
  17 #include "network.h"
  18 #include "netserv.h"
  19 #include "main.h"
  20 #include "game.h"
  21 #include "tape.h"
  22 #include "files.h"
  23 #include "tools.h"
  24 #include "screens.h"
  25 #include "init.h"
  26
  27 struct NetworkClientPlayerInfo
  28 {
  29   byte nr;
  30   char name[MAX_PLAYER_NAME_LEN + 1];
  31   struct NetworkClientPlayerInfo *next;
  32 };
  33
  34 static struct NetworkClientPlayerInfo first_player =
  35 {
  36   0,
  37   EMPTY_PLAYER_NAME,
  38   NULL
  39 };
  40
  41 /* server stuff */
  42
  43 static TCPsocket sfd;           /* TCP server socket */
  44 static UDPsocket udp;           /* UDP server socket */
  45 static SDLNet_SocketSet rfds;   /* socket set */
  46
  47 static struct NetworkBuffer *read_buffer = NULL;
  48 static struct NetworkBuffer *write_buffer = NULL;
  49
  50 static boolean stop_network_game = FALSE;
  51 static boolean stop_network_client = FALSE;
  52 static char stop_network_client_message[MAX_OUTPUT_LINESIZE + 1];
  53
  54 static struct NetworkLevelInfo network_level;
  55
  56 static void DrawNetworkTextExt(char *message, int font_nr, boolean initialize)
  57 {
  58   static int xpos = 0, ypos = 0;
  59   static int max_line_width = 0;
  60   int font_width = getFontWidth(font_nr);
  61   int font_height = getFontHeight(font_nr);
  62   int ypos_1 = 120;
  63   int ypos_2 = 150;
  64
  65   if (initialize)
  66   {
  67     if (game_status == GAME_MODE_LOADING)
  68     {
  69       max_line_width = WIN_XSIZE;
  70
  71       xpos = (max_line_width - getTextWidth(message, font_nr)) / 2;
  72       ypos = ypos_1;
  73
  74       DrawText(xpos, ypos, message, font_nr);
  75
  76       xpos = 0;
  77       ypos = ypos_2;
  78     }
  79     else
  80     {
  81       max_line_width = SXSIZE;
  82
  83       DrawTextSCentered(ypos_1, font_nr, message);
  84
  85       /* calculate offset to x position caused by rounding */
  86       int max_chars_per_line = max_line_width / font_width;
  87       int xoffset = (max_line_width - max_chars_per_line * font_width) / 2;
  88
  89       xpos = SX + xoffset;
  90       ypos = SY + ypos_2;
  91     }
  92
  93     Error(ERR_DEBUG, "========== %s ==========", message);
  94   }
  95   else
  96   {
  97     int max_chars_per_line = max_line_width / font_width;
  98     int max_lines_per_text = 10;
  99     int num_lines_spacing = (font_nr == FC_YELLOW ? 1 : 3);
 100     int num_lines_printed = DrawTextBuffer(xpos, ypos, message, font_nr,
 101                                            max_chars_per_line, -1,
 102                                            max_lines_per_text, 0, -1,
 103                                            TRUE, TRUE, FALSE);
 104
 105     ypos += (num_lines_printed + num_lines_spacing) * font_height;
 106
 107     Error(ERR_DEBUG, "%s", message);
 108   }
 109
 110   BackToFront();
 111 }
 112
 113 static void DrawNetworkText(char *message)
 114 {
 115   DrawNetworkTextExt(message, FC_YELLOW, FALSE);
 116 }
 117
 118 static void DrawNetworkText_Success(char *message)
 119 {
 120   DrawNetworkTextExt(message, FC_GREEN, FALSE);
 121 }
 122
 123 static void DrawNetworkText_Failed(char *message)
 124 {
 125   DrawNetworkTextExt(message, FC_RED, FALSE);
 126 }
 127
 128 static void DrawNetworkText_Title(char *message)
 129 {
 130   DrawNetworkTextExt(message, FC_GREEN, TRUE);
 131 }
 132
 133 static void SendNetworkBufferToServer(struct NetworkBuffer *nb)
 134 {
 135   if (!network.enabled)
 136     return;
 137
 138   /* set message length header */
 139   putNetwork32BitInteger(nb->buffer, nb->size - 4);
 140
 141   /* directly send the buffer to the network server */
 142   SDLNet_TCP_Send(sfd, nb->buffer, nb->size);
 143 }
 144
 145 struct NetworkClientPlayerInfo *getNetworkPlayer(int player_nr)
 146 {
 147   struct NetworkClientPlayerInfo *player = NULL;
 148
 149   for (player = &first_player; player; player = player->next)
 150     if (player->nr == player_nr)
 151       break;
 152
 153   if (player == NULL)   /* should not happen */
 154     Error(ERR_EXIT, "protocol error: reference to non-existing player %d",
 155           player_nr);
 156
 157   return player;
 158 }
 159
 160 char *getNetworkPlayerName(int player_nr)
 161 {
 162   struct NetworkClientPlayerInfo *player;
 163
 164   if (player_nr == 0)
 165     return("the network game server");
 166   else if (player_nr == first_player.nr)
 167     return("you");
 168   else
 169     for (player = &first_player; player; player = player->next)
 170       if (player->nr == player_nr && strlen(player->name) > 0)
 171         return(player->name);
 172
 173   return(EMPTY_PLAYER_NAME);
 174 }
 175
 176 static boolean hasPathSeparator(char *s)
 177 {
 178   return (strchr(s, '/') != NULL);
 179 }
 180
 181 static void StartNetworkServer(int port)
 182 {
 183   static int p;
 184
 185   p = port;
 186 #if defined(TARGET_SDL2)
 187   server_thread = SDL_CreateThread(NetworkServerThread,
 188                                    "NetworkServerThread", &p);
 189 #else
 190   server_thread = SDL_CreateThread(NetworkServerThread, &p);
 191 #endif
 192   network_server = TRUE;
 193 }
 194
 195 boolean ConnectToServer(char *hostname, int port)
 196 {
 197   IPaddress ip;
 198   int server_host = 0;
 199   int i;
 200
 201   if (read_buffer == NULL)
 202     read_buffer = newNetworkBuffer();
 203
 204   if (write_buffer == NULL)
 205     write_buffer = newNetworkBuffer();
 206
 207   DrawNetworkText_Title("Initializing Network");
 208
 209   if (port == 0)
 210     port = DEFAULT_SERVER_PORT;
 211
 212   if (hostname == NULL)
 213   {
 214     // if no hostname given, try to auto-detect network server in local network
 215     // by doing a UDP broadcast on the network server port and wait for answer
 216
 217     SDLNet_SocketSet udp_socket_set = SDLNet_AllocSocketSet(1);
 218     if (!udp_socket_set)
 219       Error(ERR_EXIT, "SDLNet_AllocSocketSet() failed: %s"), SDLNet_GetError();
 220
 221     udp = SDLNet_UDP_Open(0);
 222     if(!udp)
 223       Error(ERR_EXIT, "SDLNet_UDP_Open() failed: %s", SDLNet_GetError());
 224
 225     if (SDLNet_UDP_AddSocket(udp_socket_set, udp) == -1)
 226       Error(ERR_EXIT_NETWORK_SERVER, "SDLNet_TCP_AddSocket() failed: %s"),
 227         SDLNet_GetError();
 228
 229     char *data_ptr = "network server UDB broadcast";
 230     int data_len = strlen(data_ptr) + 1;
 231     IPaddress ip_address;
 232
 233     SDLNet_Write32(0xffffffff, &ip_address.host);       /* 255.255.255.255 */
 234     SDLNet_Write16(port,       &ip_address.port);
 235
 236     UDPpacket packet =
 237     {
 238       -1,
 239       (Uint8 *)data_ptr,
 240       data_len,
 241       data_len,
 242       0,
 243       ip_address
 244     };
 245
 246     SDLNet_UDP_Send(udp, -1, &packet);
 247
 248     DrawNetworkText("Looking for local network server ...");
 249
 250     /* wait for any local network server to answer UDP broadcast */
 251     for (i = 0; i < 5; i++)
 252     {
 253       if (SDLNet_CheckSockets(udp_socket_set, 0) == 1)
 254       {
 255         int num_packets = SDLNet_UDP_Recv(udp, &packet);
 256
 257         if (num_packets == 1)
 258         {
 259           DrawNetworkText_Success("Network server found!");
 260
 261           server_host = SDLNet_Read32(&packet.address.host);
 262         }
 263         else
 264         {
 265           DrawNetworkText_Failed("No answer from network server!");
 266         }
 267
 268         break;
 269       }
 270       else
 271       {
 272         Delay_WithScreenUpdates(100);
 273       }
 274     }
 275
 276     if (server_host == 0)
 277       DrawNetworkText_Failed("No network server found!");
 278   }
 279
 280   rfds = SDLNet_AllocSocketSet(1);
 281
 282   if (hostname)
 283   {
 284     SDLNet_ResolveHost(&ip, hostname, port);
 285
 286     if (ip.host == INADDR_NONE)
 287       Error(ERR_EXIT, "cannot locate host '%s'", hostname);
 288     else
 289       server_host = SDLNet_Read32(&ip.host);
 290
 291     DrawNetworkText("Connecting to remote host ...");
 292   }
 293   else
 294   {
 295     // if no hostname was given and no network server was auto-detected in the
 296     // local network, try to connect to a network server at the local host
 297     if (server_host == 0)
 298       server_host = 0x7f000001;                 /* 127.0.0.1 */
 299
 300     SDLNet_Write32(server_host, &ip.host);
 301     SDLNet_Write16(port,        &ip.port);
 302
 303     DrawNetworkText("Connecting to local host ...");
 304   }
 305
 306   Error(ERR_DEBUG, "trying to connect to network server at %d.%d.%d.%d ...",
 307         (server_host >> 24) & 0xff,
 308         (server_host >> 16) & 0xff,
 309         (server_host >>  8) & 0xff,
 310         (server_host >>  0) & 0xff);
 311
 312   sfd = SDLNet_TCP_Open(&ip);
 313
 314   if (sfd)
 315   {
 316     SDLNet_TCP_AddSocket(rfds, sfd);
 317
 318     DrawNetworkText_Success("Successfully connected!");
 319
 320     return TRUE;
 321   }
 322   else
 323   {
 324     DrawNetworkText_Failed("Failed to connect to network server!");
 325
 326     printf("SDLNet_TCP_Open(): %s\n", SDLNet_GetError());
 327   }
 328
 329   if (hostname)                 /* connect to specified server failed */
 330     return FALSE;
 331
 332   DrawNetworkText("Starting new local network server ...");
 333
 334   StartNetworkServer(port);
 335
 336   /* wait for server to start up and try connecting several times */
 337   for (i = 0; i < 30; i++)
 338   {
 339     if ((sfd = SDLNet_TCP_Open(&ip)))           /* connected */
 340     {
 341       DrawNetworkText_Success("Successfully connected!");
 342
 343       SDLNet_TCP_AddSocket(rfds, sfd);
 344       return TRUE;
 345     }
 346
 347     Delay_WithScreenUpdates(100);
 348   }
 349
 350   DrawNetworkText_Failed("Failed to connect to network server!");
 351
 352   /* when reaching this point, connect to newly started server has failed */
 353   return FALSE;
 354 }
 355
 356 void SendToServer_PlayerName(char *player_name)
 357 {
 358   initNetworkBufferForWriting(write_buffer, OP_PLAYER_NAME, 0);
 359
 360   putNetworkBufferString(write_buffer, player_name);
 361
 362   SendNetworkBufferToServer(write_buffer);
 363
 364   Error(ERR_NETWORK_CLIENT, "you set your player name to \"%s\"", player_name);
 365 }
 366
 367 void SendToServer_ProtocolVersion()
 368 {
 369   initNetworkBufferForWriting(write_buffer, OP_PROTOCOL_VERSION, 0);
 370
 371   putNetworkBuffer8BitInteger(write_buffer, PROTOCOL_VERSION_MAJOR);
 372   putNetworkBuffer8BitInteger(write_buffer, PROTOCOL_VERSION_MINOR);
 373   putNetworkBuffer8BitInteger(write_buffer, PROTOCOL_VERSION_PATCH);
 374
 375   SendNetworkBufferToServer(write_buffer);
 376 }
 377
 378 void SendToServer_NrWanted(int nr_wanted)
 379 {
 380   initNetworkBufferForWriting(write_buffer, OP_NUMBER_WANTED, 0);
 381
 382   putNetworkBuffer8BitInteger(write_buffer, nr_wanted);
 383
 384   SendNetworkBufferToServer(write_buffer);
 385 }
 386
 387 void SendToServer_LevelFile()
 388 {
 389   initNetworkBufferForWriting(write_buffer, OP_LEVEL_FILE, 0);
 390
 391   putNetworkBufferString(      write_buffer, leveldir_current->identifier);
 392   putNetworkBuffer16BitInteger(write_buffer, level.file_info.nr);
 393   putNetworkBuffer8BitInteger( write_buffer, level.file_info.type);
 394   putNetworkBuffer8BitInteger( write_buffer, level.file_info.packed);
 395   putNetworkBufferString(      write_buffer, level.file_info.basename);
 396   putNetworkBufferFile(        write_buffer, level.file_info.filename);
 397   putNetworkBuffer8BitInteger( write_buffer, level.use_custom_template);
 398
 399   if (level.use_custom_template)
 400   {
 401     putNetworkBufferString(write_buffer, level_template.file_info.basename);
 402     putNetworkBufferFile(  write_buffer, level_template.file_info.filename);
 403   }
 404
 405   SendNetworkBufferToServer(write_buffer);
 406
 407   setString(&network_level.leveldir_identifier, leveldir_current->identifier);
 408
 409   /* the sending client does not use network level files (but the real ones) */
 410   network_level.use_network_level_files = FALSE;
 411
 412 #if 0
 413   printf("::: '%s'\n", leveldir_current->identifier);
 414   printf("::: '%d'\n", level.file_info.nr);
 415   printf("::: '%d'\n", level.file_info.type);
 416   printf("::: '%d'\n", level.file_info.packed);
 417   printf("::: '%s'\n", level.file_info.basename);
 418   printf("::: '%s'\n", level.file_info.filename);
 419
 420   if (level.use_custom_template)
 421     printf("::: '%s'\n", level_template.file_info.filename);
 422 #endif
 423 }
 424
 425 void SendToServer_StartPlaying()
 426 {
 427   unsigned int new_random_seed = InitRND(level.random_seed);
 428
 429   initNetworkBufferForWriting(write_buffer, OP_START_PLAYING, 0);
 430
 431   putNetworkBufferString(      write_buffer, leveldir_current->identifier);
 432   putNetworkBuffer16BitInteger(write_buffer, level_nr);
 433   putNetworkBuffer32BitInteger(write_buffer, new_random_seed);
 434
 435   SendNetworkBufferToServer(write_buffer);
 436 }
 437
 438 void SendToServer_PausePlaying()
 439 {
 440   initNetworkBufferForWriting(write_buffer, OP_PAUSE_PLAYING, 0);
 441
 442   SendNetworkBufferToServer(write_buffer);
 443 }
 444
 445 void SendToServer_ContinuePlaying()
 446 {
 447   initNetworkBufferForWriting(write_buffer, OP_CONTINUE_PLAYING, 0);
 448
 449   SendNetworkBufferToServer(write_buffer);
 450 }
 451
 452 void SendToServer_StopPlaying(int cause_for_stopping)
 453 {
 454   initNetworkBufferForWriting(write_buffer, OP_STOP_PLAYING, 0);
 455
 456   putNetworkBuffer8BitInteger(write_buffer, cause_for_stopping);
 457
 458   SendNetworkBufferToServer(write_buffer);
 459 }
 460
 461 void SendToServer_MovePlayer(byte player_action)
 462 {
 463   initNetworkBufferForWriting(write_buffer, OP_MOVE_PLAYER, 0);
 464
 465   putNetworkBuffer8BitInteger(write_buffer, player_action);
 466
 467   SendNetworkBufferToServer(write_buffer);
 468 }
 469
 470 static void Handle_OP_BAD_PROTOCOL_VERSION()
 471 {
 472   int protocol_version_major = getNetworkBuffer8BitInteger(read_buffer);
 473   int protocol_version_minor = getNetworkBuffer8BitInteger(read_buffer);
 474
 475   Error(ERR_WARN, "protocol version mismatch");
 476   Error(ERR_WARN, "server expects %d.%d.x instead of %d.%d.%d",
 477         protocol_version_major,
 478         protocol_version_minor,
 479         PROTOCOL_VERSION_MAJOR,
 480         PROTOCOL_VERSION_MINOR,
 481         PROTOCOL_VERSION_PATCH);
 482
 483   sprintf(stop_network_client_message, "Network protocol version mismatch! Server expects version %d.%d.x instead of %d.%d.%d!",
 484           protocol_version_major,
 485           protocol_version_minor,
 486           PROTOCOL_VERSION_MAJOR,
 487           PROTOCOL_VERSION_MINOR,
 488           PROTOCOL_VERSION_PATCH);
 489
 490   stop_network_client = TRUE;
 491 }
 492
 493 static void Handle_OP_YOUR_NUMBER()
 494 {
 495   int old_client_nr = getNetworkBuffer8BitInteger(read_buffer);
 496   int new_client_nr = getNetworkBuffer8BitInteger(read_buffer);
 497   int new_index_nr = new_client_nr - 1;
 498   struct PlayerInfo *old_local_player = local_player;
 499   struct PlayerInfo *new_local_player = &stored_player[new_index_nr];
 500
 501   printf("OP_YOUR_NUMBER: %d\n", old_client_nr);
 502   first_player.nr = new_client_nr;
 503
 504   if (old_local_player != new_local_player)
 505   {
 506     /* set relevant player settings and change to new player */
 507
 508     local_player = new_local_player;
 509
 510     old_local_player->connected_locally = FALSE;
 511     new_local_player->connected_locally = TRUE;
 512
 513     old_local_player->connected_network = FALSE;
 514     new_local_player->connected_network = TRUE;
 515   }
 516
 517   if (first_player.nr > MAX_PLAYERS)
 518     Error(ERR_EXIT, "sorry, more than %d players not allowed", MAX_PLAYERS);
 519
 520   Error(ERR_NETWORK_CLIENT, "you get client # %d", new_client_nr);
 521
 522   stored_player[new_index_nr].connected_network = TRUE;
 523 }
 524
 525 static void Handle_OP_NUMBER_WANTED()
 526 {
 527   int old_client_nr    = getNetworkBuffer8BitInteger(read_buffer);
 528   int client_nr_wanted = getNetworkBuffer8BitInteger(read_buffer);
 529   int new_client_nr    = getNetworkBuffer8BitInteger(read_buffer);
 530   int old_index_nr = old_client_nr - 1;
 531   int new_index_nr = new_client_nr - 1;
 532   int index_nr_wanted = client_nr_wanted - 1;
 533   struct PlayerInfo *old_player = &stored_player[old_index_nr];
 534   struct PlayerInfo *new_player = &stored_player[new_index_nr];
 535
 536   printf("OP_NUMBER_WANTED: %d\n", old_client_nr);
 537
 538   if (new_client_nr == client_nr_wanted)        /* switching succeeded */
 539   {
 540     struct NetworkClientPlayerInfo *player;
 541
 542     if (old_client_nr != client_nr_wanted)      /* client's nr has changed */
 543       Error(ERR_NETWORK_CLIENT, "client %d switches to # %d",
 544             old_client_nr, new_client_nr);
 545     else if (old_client_nr == first_player.nr)  /* local player keeps his nr */
 546       Error(ERR_NETWORK_CLIENT, "keeping client # %d", new_client_nr);
 547
 548     if (old_client_nr != new_client_nr)
 549     {
 550       /* set relevant player settings and change to new player */
 551
 552       old_player->connected_network = FALSE;
 553       new_player->connected_network = TRUE;
 554     }
 555
 556     player = getNetworkPlayer(old_client_nr);
 557     player->nr = new_client_nr;
 558
 559     if (old_player == local_player)             /* local player switched */
 560     {
 561       local_player = new_player;
 562
 563       old_player->connected_locally = FALSE;
 564       new_player->connected_locally = TRUE;
 565     }
 566   }
 567   else if (old_client_nr == first_player.nr)    /* failed -- local player? */
 568   {
 569     char request[100];
 570
 571     sprintf(request, "Sorry! Player %d already exists! You are player %d!",
 572             index_nr_wanted + 1, new_index_nr + 1);
 573
 574     Request(request, REQ_CONFIRM);
 575
 576     Error(ERR_NETWORK_CLIENT, "cannot switch -- you keep client # %d",
 577           new_client_nr);
 578   }
 579
 580   if (game_status == GAME_MODE_MAIN)
 581     DrawNetworkPlayers();
 582 }
 583
 584 static void Handle_OP_PLAYER_NAME()
 585 {
 586   int player_nr = getNetworkBuffer8BitInteger(read_buffer);
 587   char *player_name = getNetworkBufferString(read_buffer);
 588   struct NetworkClientPlayerInfo *player = getNetworkPlayer(player_nr);
 589
 590   printf("OP_PLAYER_NAME: %d\n", player_nr);
 591
 592   strncpy(player->name, player_name, MAX_PLAYER_NAME_LEN);
 593   player->name[MAX_PLAYER_NAME_LEN] = '\0';
 594
 595   Error(ERR_NETWORK_CLIENT, "client %d calls itself \"%s\"",
 596         player_nr, player->name);
 597 }
 598
 599 static void Handle_OP_PLAYER_CONNECTED()
 600 {
 601   struct NetworkClientPlayerInfo *player, *last_player = NULL;
 602   int new_client_nr = getNetworkBuffer8BitInteger(read_buffer);
 603   int new_index_nr = new_client_nr - 1;
 604
 605   printf("OP_PLAYER_CONNECTED: %d\n", new_client_nr);
 606   Error(ERR_NETWORK_CLIENT, "new client %d connected", new_client_nr);
 607
 608   for (player = &first_player; player; player = player->next)
 609   {
 610     if (player->nr == new_client_nr)
 611       Error(ERR_EXIT, "multiplayer server sent duplicate player id");
 612
 613     last_player = player;
 614   }
 615
 616   last_player->next = player =
 617     checked_malloc(sizeof(struct NetworkClientPlayerInfo));
 618   player->nr = new_client_nr;
 619   player->name[0] = '\0';
 620   player->next = NULL;
 621
 622   stored_player[new_index_nr].connected_network = TRUE;
 623 }
 624
 625 static void Handle_OP_PLAYER_DISCONNECTED()
 626 {
 627   struct NetworkClientPlayerInfo *player, *player_disconnected;
 628   int player_nr = getNetworkBuffer8BitInteger(read_buffer);
 629   int index_nr = player_nr - 1;
 630
 631   printf("OP_PLAYER_DISCONNECTED: %d\n", player_nr);
 632   player_disconnected = getNetworkPlayer(player_nr);
 633   Error(ERR_NETWORK_CLIENT, "client %d (%s) disconnected",
 634         player_nr, getNetworkPlayerName(player_nr));
 635
 636   for (player = &first_player; player; player = player->next)
 637     if (player->next == player_disconnected)
 638       player->next = player_disconnected->next;
 639   free(player_disconnected);
 640
 641   stored_player[index_nr].connected_locally = FALSE;
 642   stored_player[index_nr].connected_network = FALSE;
 643
 644   if (game_status == GAME_MODE_PLAYING)
 645   {
 646     char message[100];
 647
 648     sprintf(message, "Player %d left network server! Network game stopped!",
 649             player_nr);
 650
 651     Request(message, REQ_CONFIRM | REQ_STAY_CLOSED);
 652
 653     SetGameStatus(GAME_MODE_MAIN);
 654
 655     DrawMainMenu();
 656   }
 657   else if (game_status == GAME_MODE_MAIN)
 658   {
 659     DrawNetworkPlayers();
 660   }
 661 }
 662
 663 static void Handle_OP_START_PLAYING()
 664 {
 665   int player_nr = getNetworkBuffer8BitInteger(read_buffer);
 666   char *new_leveldir_identifier = getNetworkBufferString(read_buffer);
 667   int new_level_nr = getNetworkBuffer16BitInteger(read_buffer);
 668   unsigned int new_random_seed = getNetworkBuffer32BitInteger(read_buffer);
 669
 670   if (!strEqual(new_leveldir_identifier, network_level.leveldir_identifier))
 671   {
 672     Error(ERR_WARN, "no such level identifier: '%s'", new_leveldir_identifier);
 673
 674     stop_network_game = TRUE;
 675
 676     return;
 677   }
 678
 679   printf("OP_START_PLAYING: %d\n", player_nr);
 680   Error(ERR_NETWORK_CLIENT,
 681         "client %d starts game [level %d from level identifier '%s']\n",
 682         player_nr, new_level_nr, new_leveldir_identifier);
 683
 684   LevelDirTree *new_leveldir =
 685     getTreeInfoFromIdentifier(leveldir_first, new_leveldir_identifier);
 686
 687   if (new_leveldir != NULL)
 688   {
 689     leveldir_current = new_leveldir;
 690     level_nr = new_level_nr;
 691   }
 692
 693   /* needed if level set of network game changed graphics, sounds or music */
 694   ReloadCustomArtwork(0);
 695
 696   TapeErase();
 697
 698   if (network_level.use_network_level_files)
 699     LoadNetworkLevel(&network_level);
 700   else
 701     LoadLevel(level_nr);
 702
 703   StartGameActions(FALSE, setup.autorecord, new_random_seed);
 704 }
 705
 706 static void Handle_OP_PAUSE_PLAYING()
 707 {
 708   int player_nr = getNetworkBuffer8BitInteger(read_buffer);
 709
 710   printf("OP_PAUSE_PLAYING: %d\n", player_nr);
 711   Error(ERR_NETWORK_CLIENT, "client %d pauses game", player_nr);
 712
 713   if (game_status == GAME_MODE_PLAYING)
 714   {
 715     tape.pausing = TRUE;
 716     DrawVideoDisplay(VIDEO_STATE_PAUSE_ON, 0);
 717   }
 718 }
 719
 720 static void Handle_OP_CONTINUE_PLAYING()
 721 {
 722   int player_nr = getNetworkBuffer8BitInteger(read_buffer);
 723
 724   printf("OP_CONTINUE_PLAYING: %d\n", player_nr);
 725   Error(ERR_NETWORK_CLIENT, "client %d continues game", player_nr);
 726
 727   if (game_status == GAME_MODE_PLAYING)
 728   {
 729     tape.pausing = FALSE;
 730     DrawVideoDisplay(VIDEO_STATE_PAUSE_OFF, 0);
 731   }
 732 }
 733
 734 static void Handle_OP_STOP_PLAYING()
 735 {
 736   int client_nr = getNetworkBuffer8BitInteger(read_buffer);
 737   int cause_for_stopping = getNetworkBuffer8BitInteger(read_buffer);
 738
 739   printf("OP_STOP_PLAYING: %d [%d]\n", client_nr, cause_for_stopping);
 740   Error(ERR_NETWORK_CLIENT, "client %d stops game [%d]",
 741         client_nr, cause_for_stopping);
 742
 743   if (game_status == GAME_MODE_PLAYING)
 744   {
 745     int index_nr = client_nr - 1;
 746     struct PlayerInfo *client_player = &stored_player[index_nr];
 747     boolean stopped_by_remote_player = (!client_player->connected_locally);
 748     char message[100];
 749
 750     sprintf(message, (cause_for_stopping == NETWORK_STOP_BY_PLAYER ?
 751                       "Network game stopped by player %d!" :
 752                       cause_for_stopping == NETWORK_STOP_BY_ERROR ?
 753                       "Network game stopped due to internal error!" :
 754                       "Network game stopped!"), client_nr);
 755
 756     if (cause_for_stopping != NETWORK_STOP_BY_PLAYER ||
 757         stopped_by_remote_player)
 758       Request(message, REQ_CONFIRM | REQ_STAY_CLOSED);
 759
 760     SetGameStatus(GAME_MODE_MAIN);
 761
 762     DrawMainMenu();
 763   }
 764 }
 765
 766 static void Handle_OP_MOVE_PLAYER()
 767 {
 768   int player_nr = getNetworkBuffer8BitInteger(read_buffer);
 769   int server_frame_counter = getNetworkBuffer32BitInteger(read_buffer);
 770   int i;
 771
 772   if (!network_playing)
 773     return;
 774
 775   if (server_frame_counter != FrameCounter)
 776   {
 777     Error(ERR_INFO, "frame counters of client %d and server out of sync",
 778           player_nr);
 779     Error(ERR_INFO, "frame counter of client is %d", FrameCounter);
 780     Error(ERR_INFO, "frame counter of server is %d", server_frame_counter);
 781     Error(ERR_INFO, "this should not happen -- please debug");
 782
 783     stop_network_game = TRUE;
 784
 785     return;
 786   }
 787
 788   /* copy valid player actions (will be set to 0 for not connected players) */
 789   for (i = 0; i < MAX_PLAYERS; i++)
 790     stored_player[i].effective_action =
 791       getNetworkBuffer8BitInteger(read_buffer);
 792
 793   network_player_action_received = TRUE;
 794 }
 795
 796 static void Handle_OP_BROADCAST_MESSAGE()
 797 {
 798   int player_nr = getNetworkBuffer8BitInteger(read_buffer);
 799
 800   printf("OP_BROADCAST_MESSAGE: %d\n", player_nr);
 801   Error(ERR_NETWORK_CLIENT, "client %d sends message", player_nr);
 802 }
 803
 804 static void Handle_OP_LEVEL_FILE()
 805 {
 806   int player_nr = getNetworkBuffer8BitInteger(read_buffer);
 807   char *leveldir_identifier;
 808   char *network_level_dir;
 809   struct LevelFileInfo *file_info = &network_level.file_info;
 810   struct LevelFileInfo *tmpl_info = &network_level.tmpl_info;
 811   boolean use_custom_template;
 812
 813   setString(&network_level.leveldir_identifier, NULL);
 814   setString(&network_level.file_info.basename,  NULL);
 815   setString(&network_level.file_info.filename,  NULL);
 816   setString(&network_level.tmpl_info.basename,  NULL);
 817   setString(&network_level.tmpl_info.filename,  NULL);
 818
 819   printf("OP_LEVEL_FILE: %d\n", player_nr);
 820
 821   leveldir_identifier = getStringCopy(getNetworkBufferString(read_buffer));
 822
 823   if (hasPathSeparator(leveldir_identifier))
 824     Error(ERR_EXIT, "protocol error: invalid filename from network client");
 825
 826   InitNetworkLevelDirectory(leveldir_identifier);
 827
 828   network_level_dir   = getNetworkLevelDir(leveldir_identifier);
 829
 830   file_info->nr       = getNetworkBuffer16BitInteger(read_buffer);
 831   file_info->type     = getNetworkBuffer8BitInteger(read_buffer);
 832   file_info->packed   = getNetworkBuffer8BitInteger(read_buffer);
 833   file_info->basename = getStringCopy(getNetworkBufferString(read_buffer));
 834   file_info->filename = getPath2(network_level_dir, file_info->basename);
 835
 836   if (hasPathSeparator(file_info->basename))
 837     Error(ERR_EXIT, "protocol error: invalid filename from network client");
 838
 839   getNetworkBufferFile(read_buffer, file_info->filename);
 840
 841   use_custom_template = getNetworkBuffer8BitInteger(read_buffer);
 842   if (use_custom_template)
 843   {
 844     *tmpl_info = *file_info;
 845
 846     tmpl_info->basename = getStringCopy(getNetworkBufferString(read_buffer));
 847     tmpl_info->filename = getPath2(network_level_dir, tmpl_info->basename);
 848
 849     if (hasPathSeparator(tmpl_info->basename))
 850       Error(ERR_EXIT, "protocol error: invalid filename from network client");
 851
 852     getNetworkBufferFile(read_buffer, tmpl_info->filename);
 853   }
 854
 855   network_level.leveldir_identifier = leveldir_identifier;
 856   network_level.use_custom_template = use_custom_template;
 857
 858   /* the receiving client(s) use(s) the transferred network level files */
 859   network_level.use_network_level_files = TRUE;
 860
 861 #if 0
 862   printf("::: '%s'\n", leveldir_identifier);
 863   printf("::: '%d'\n", file_info->nr);
 864   printf("::: '%d'\n", file_info->type);
 865   printf("::: '%d'\n", file_info->packed);
 866   printf("::: '%s'\n", file_info->basename);
 867   printf("::: '%s'\n", file_info->filename);
 868
 869   if (use_custom_template)
 870     printf("::: '%s'\n", tmpl_info->filename);
 871 #endif
 872 }
 873
 874 static void HandleNetworkingMessage()
 875 {
 876   stop_network_game = FALSE;
 877
 878   initNetworkBufferForReading(read_buffer);
 879
 880   int message_type = getNetworkBuffer8BitInteger(read_buffer);
 881
 882   switch (message_type)
 883   {
 884     case OP_BAD_PROTOCOL_VERSION:
 885       Handle_OP_BAD_PROTOCOL_VERSION();
 886       break;
 887
 888     case OP_YOUR_NUMBER:
 889       Handle_OP_YOUR_NUMBER();
 890       break;
 891
 892     case OP_NUMBER_WANTED:
 893       Handle_OP_NUMBER_WANTED();
 894       break;
 895
 896     case OP_PLAYER_NAME:
 897       Handle_OP_PLAYER_NAME();
 898       break;
 899
 900     case OP_PLAYER_CONNECTED:
 901       Handle_OP_PLAYER_CONNECTED();
 902       break;
 903
 904     case OP_PLAYER_DISCONNECTED:
 905       Handle_OP_PLAYER_DISCONNECTED();
 906       break;
 907
 908     case OP_START_PLAYING:
 909       Handle_OP_START_PLAYING();
 910       break;
 911
 912     case OP_PAUSE_PLAYING:
 913       Handle_OP_PAUSE_PLAYING();
 914       break;
 915
 916     case OP_CONTINUE_PLAYING:
 917       Handle_OP_CONTINUE_PLAYING();
 918       break;
 919
 920     case OP_STOP_PLAYING:
 921       Handle_OP_STOP_PLAYING();
 922       break;
 923
 924     case OP_MOVE_PLAYER:
 925       Handle_OP_MOVE_PLAYER();
 926       break;
 927
 928     case OP_BROADCAST_MESSAGE:
 929       Handle_OP_BROADCAST_MESSAGE();
 930       break;
 931
 932     case OP_LEVEL_FILE:
 933       Handle_OP_LEVEL_FILE();
 934       break;
 935
 936     default:
 937       if (options.verbose)
 938         Error(ERR_NETWORK_CLIENT,
 939               "unknown opcode %d from server", message_type);
 940   }
 941
 942   fflush(stdout);
 943
 944   /* in case of internal error, stop network game */
 945   if (stop_network_game)
 946     SendToServer_StopPlaying(NETWORK_STOP_BY_ERROR);
 947 }
 948
 949 static char *HandleNetworkingPackets()
 950 {
 951   while (1)
 952   {
 953     /* ---------- check network server for activity ---------- */
 954
 955     int num_active_sockets = SDLNet_CheckSockets(rfds, 0);
 956
 957     if (num_active_sockets < 0)
 958       return "Error checking network sockets!";
 959
 960     if (num_active_sockets == 0)
 961       break;    // no active sockets, stop here
 962
 963     /* ---------- read packets from network server ---------- */
 964
 965     initNetworkBufferForReceiving(read_buffer);
 966
 967     int num_bytes = receiveNetworkBufferPacket(read_buffer, sfd);
 968
 969     if (num_bytes < 0)
 970       return "Error reading from network server!";
 971
 972     if (num_bytes == 0)
 973       return "Connection to network server lost!";
 974
 975     HandleNetworkingMessage();
 976
 977     if (stop_network_client)
 978       return stop_network_client_message;
 979   }
 980
 981   return NULL;
 982 }
 983
 984 static void FreeNetworkClientPlayerInfo(struct NetworkClientPlayerInfo *player)
 985 {
 986   if (player == NULL)
 987     return;
 988
 989   if (player->next)
 990     FreeNetworkClientPlayerInfo(player->next);
 991
 992   checked_free(player);
 993 }
 994
 995 static void HandleNetworkingDisconnect()
 996 {
 997   int i;
 998
 999   SDLNet_TCP_DelSocket(rfds, sfd);
1000   SDLNet_TCP_Close(sfd);
1001
1002   network_playing = FALSE;
1003
1004   network.enabled = FALSE;
1005   network.connected = FALSE;
1006
1007   setup.network_mode = FALSE;
1008
1009   for (i = 0; i < MAX_PLAYERS; i++)
1010     stored_player[i].connected_network = FALSE;
1011
1012   FreeNetworkClientPlayerInfo(first_player.next);
1013
1014   first_player.nr = 0;
1015   first_player.next = NULL;
1016 }
1017
1018 void HandleNetworking()
1019 {
1020   char *error_message = HandleNetworkingPackets();
1021
1022   if (error_message != NULL)
1023   {
1024     HandleNetworkingDisconnect();
1025
1026     if (game_status == GAME_MODE_PLAYING)
1027     {
1028       Request(error_message, REQ_CONFIRM | REQ_STAY_CLOSED);
1029
1030       SetGameStatus(GAME_MODE_MAIN);
1031
1032       DrawMainMenu();
1033     }
1034     else
1035     {
1036       Request(error_message, REQ_CONFIRM);
1037
1038       if (game_status == GAME_MODE_MAIN)
1039         ClearNetworkPlayers();
1040     }
1041   }
1042 }
1043
1044 void DisconnectFromNetworkServer()
1045 {
1046   DrawNetworkText_Title("Terminating Network");
1047   DrawNetworkText("Disconnecting from network server ...");
1048
1049   HandleNetworkingDisconnect();
1050
1051   DrawNetworkText_Success("Successfully disconnected!");
1052
1053   /* short time to recognize result of network initialization */
1054   Delay_WithScreenUpdates(1000);
1055 }