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 static 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 nearby network server ...");
 249
 250     /* wait for any nearby 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           char message[100];
 260
 261           server_host = SDLNet_Read32(&packet.address.host);
 262
 263           sprintf(message, "Network server found at %d.%d.%d.%d!",
 264                   (server_host >> 24) & 0xff,
 265                   (server_host >> 16) & 0xff,
 266                   (server_host >>  8) & 0xff,
 267                   (server_host >>  0) & 0xff);
 268
 269           DrawNetworkText_Success(message);
 270         }
 271         else
 272         {
 273           DrawNetworkText_Failed("No answer from network server!");
 274         }
 275
 276         break;
 277       }
 278       else
 279       {
 280         Delay_WithScreenUpdates(100);
 281       }
 282     }
 283
 284     if (server_host == 0)
 285       DrawNetworkText_Failed("No nearby network server found!");
 286   }
 287
 288   rfds = SDLNet_AllocSocketSet(1);
 289
 290   if (hostname)
 291   {
 292     char message[100];
 293
 294     SDLNet_ResolveHost(&ip, hostname, port);
 295
 296     if (ip.host == INADDR_NONE)
 297     {
 298       sprintf(message, "Failed to resolve network server hostname '%s'!",
 299               hostname);
 300
 301       DrawNetworkText_Failed(message);
 302
 303       return FALSE;
 304     }
 305     else
 306     {
 307       server_host = SDLNet_Read32(&ip.host);
 308     }
 309
 310     sprintf(message, "Connecting to network server host %s ...", hostname);
 311
 312     DrawNetworkText(message);
 313   }
 314   else
 315   {
 316     // if no hostname was given and no network server was auto-detected in the
 317     // local network, try to connect to a network server at the local host
 318     if (server_host == 0)
 319     {
 320       server_host = 0x7f000001;                 /* 127.0.0.1 */
 321
 322       DrawNetworkText("Looking for local network server ...");
 323     }
 324     else
 325     {
 326       DrawNetworkText("Connecting to network server ...");
 327     }
 328
 329     SDLNet_Write32(server_host, &ip.host);
 330     SDLNet_Write16(port,        &ip.port);
 331   }
 332
 333   Error(ERR_DEBUG, "trying to connect to network server at %d.%d.%d.%d ...",
 334         (server_host >> 24) & 0xff,
 335         (server_host >> 16) & 0xff,
 336         (server_host >>  8) & 0xff,
 337         (server_host >>  0) & 0xff);
 338
 339   sfd = SDLNet_TCP_Open(&ip);
 340
 341   if (sfd)
 342   {
 343     SDLNet_TCP_AddSocket(rfds, sfd);
 344
 345     DrawNetworkText_Success("Successfully connected!");
 346
 347     return TRUE;
 348   }
 349   else
 350   {
 351     if (hostname)
 352       DrawNetworkText_Failed("Failed to connect to network server!");
 353     else
 354       DrawNetworkText_Failed("No local network server found!");
 355
 356     printf("SDLNet_TCP_Open(): %s\n", SDLNet_GetError());
 357   }
 358
 359   if (hostname)                 /* connect to specified server failed */
 360     return FALSE;
 361
 362   DrawNetworkText("Starting new local network server ...");
 363
 364   StartNetworkServer(port);
 365
 366   /* wait for server to start up and try connecting several times */
 367   for (i = 0; i < 30; i++)
 368   {
 369     if ((sfd = SDLNet_TCP_Open(&ip)))           /* connected */
 370     {
 371       DrawNetworkText_Success("Successfully connected to newly started network server!");
 372
 373       SDLNet_TCP_AddSocket(rfds, sfd);
 374
 375       return TRUE;
 376     }
 377
 378     Delay_WithScreenUpdates(100);
 379   }
 380
 381   DrawNetworkText_Failed("Failed to connect to newly started network server!");
 382
 383   /* when reaching this point, connect to newly started server has failed */
 384   return FALSE;
 385 }
 386
 387 void SendToServer_PlayerName(char *player_name)
 388 {
 389   initNetworkBufferForWriting(write_buffer, OP_PLAYER_NAME, 0);
 390
 391   putNetworkBufferString(write_buffer, player_name);
 392
 393   SendNetworkBufferToServer(write_buffer);
 394
 395   Error(ERR_NETWORK_CLIENT, "you set your player name to \"%s\"", player_name);
 396 }
 397
 398 void SendToServer_ProtocolVersion(void)
 399 {
 400   initNetworkBufferForWriting(write_buffer, OP_PROTOCOL_VERSION, 0);
 401
 402   putNetworkBuffer8BitInteger(write_buffer, PROTOCOL_VERSION_MAJOR);
 403   putNetworkBuffer8BitInteger(write_buffer, PROTOCOL_VERSION_MINOR);
 404   putNetworkBuffer8BitInteger(write_buffer, PROTOCOL_VERSION_PATCH);
 405
 406   SendNetworkBufferToServer(write_buffer);
 407 }
 408
 409 void SendToServer_NrWanted(int nr_wanted)
 410 {
 411   initNetworkBufferForWriting(write_buffer, OP_NUMBER_WANTED, 0);
 412
 413   putNetworkBuffer8BitInteger(write_buffer, nr_wanted);
 414
 415   SendNetworkBufferToServer(write_buffer);
 416 }
 417
 418 void SendToServer_LevelFile(void)
 419 {
 420   initNetworkBufferForWriting(write_buffer, OP_LEVEL_FILE, 0);
 421
 422   putNetworkBufferString(      write_buffer, leveldir_current->identifier);
 423   putNetworkBuffer16BitInteger(write_buffer, level.file_info.nr);
 424   putNetworkBuffer8BitInteger( write_buffer, level.file_info.type);
 425   putNetworkBuffer8BitInteger( write_buffer, level.file_info.packed);
 426   putNetworkBufferString(      write_buffer, level.file_info.basename);
 427   putNetworkBufferFile(        write_buffer, level.file_info.filename);
 428   putNetworkBuffer8BitInteger( write_buffer, level.use_custom_template);
 429
 430   if (level.use_custom_template)
 431   {
 432     putNetworkBufferString(write_buffer, level_template.file_info.basename);
 433     putNetworkBufferFile(  write_buffer, level_template.file_info.filename);
 434   }
 435
 436   SendNetworkBufferToServer(write_buffer);
 437
 438   setString(&network_level.leveldir_identifier, leveldir_current->identifier);
 439
 440   /* the sending client does not use network level files (but the real ones) */
 441   network_level.use_network_level_files = FALSE;
 442
 443 #if 0
 444   printf("::: '%s'\n", leveldir_current->identifier);
 445   printf("::: '%d'\n", level.file_info.nr);
 446   printf("::: '%d'\n", level.file_info.type);
 447   printf("::: '%d'\n", level.file_info.packed);
 448   printf("::: '%s'\n", level.file_info.basename);
 449   printf("::: '%s'\n", level.file_info.filename);
 450
 451   if (level.use_custom_template)
 452     printf("::: '%s'\n", level_template.file_info.filename);
 453 #endif
 454 }
 455
 456 void SendToServer_StartPlaying(void)
 457 {
 458   unsigned int new_random_seed = InitRND(level.random_seed);
 459
 460   initNetworkBufferForWriting(write_buffer, OP_START_PLAYING, 0);
 461
 462   putNetworkBufferString(      write_buffer, leveldir_current->identifier);
 463   putNetworkBuffer16BitInteger(write_buffer, level_nr);
 464   putNetworkBuffer32BitInteger(write_buffer, new_random_seed);
 465
 466   SendNetworkBufferToServer(write_buffer);
 467 }
 468
 469 void SendToServer_PausePlaying(void)
 470 {
 471   initNetworkBufferForWriting(write_buffer, OP_PAUSE_PLAYING, 0);
 472
 473   SendNetworkBufferToServer(write_buffer);
 474 }
 475
 476 void SendToServer_ContinuePlaying(void)
 477 {
 478   initNetworkBufferForWriting(write_buffer, OP_CONTINUE_PLAYING, 0);
 479
 480   SendNetworkBufferToServer(write_buffer);
 481 }
 482
 483 void SendToServer_StopPlaying(int cause_for_stopping)
 484 {
 485   initNetworkBufferForWriting(write_buffer, OP_STOP_PLAYING, 0);
 486
 487   putNetworkBuffer8BitInteger(write_buffer, cause_for_stopping);
 488
 489   SendNetworkBufferToServer(write_buffer);
 490 }
 491
 492 void SendToServer_MovePlayer(byte player_action)
 493 {
 494   initNetworkBufferForWriting(write_buffer, OP_MOVE_PLAYER, 0);
 495
 496   putNetworkBuffer8BitInteger(write_buffer, player_action);
 497
 498   SendNetworkBufferToServer(write_buffer);
 499 }
 500
 501 static void Handle_OP_BAD_PROTOCOL_VERSION(void)
 502 {
 503   int protocol_version_major = getNetworkBuffer8BitInteger(read_buffer);
 504   int protocol_version_minor = getNetworkBuffer8BitInteger(read_buffer);
 505
 506   Error(ERR_WARN, "protocol version mismatch");
 507   Error(ERR_WARN, "server expects %d.%d.x instead of %d.%d.%d",
 508         protocol_version_major,
 509         protocol_version_minor,
 510         PROTOCOL_VERSION_MAJOR,
 511         PROTOCOL_VERSION_MINOR,
 512         PROTOCOL_VERSION_PATCH);
 513
 514   sprintf(stop_network_client_message, "Network protocol version mismatch! Server expects version %d.%d.x instead of %d.%d.%d!",
 515           protocol_version_major,
 516           protocol_version_minor,
 517           PROTOCOL_VERSION_MAJOR,
 518           PROTOCOL_VERSION_MINOR,
 519           PROTOCOL_VERSION_PATCH);
 520
 521   stop_network_client = TRUE;
 522 }
 523
 524 static void Handle_OP_YOUR_NUMBER(void)
 525 {
 526   int old_client_nr = getNetworkBuffer8BitInteger(read_buffer);
 527   int new_client_nr = getNetworkBuffer8BitInteger(read_buffer);
 528   int new_index_nr = new_client_nr - 1;
 529   struct PlayerInfo *old_local_player = local_player;
 530   struct PlayerInfo *new_local_player = &stored_player[new_index_nr];
 531
 532   printf("OP_YOUR_NUMBER: %d\n", old_client_nr);
 533   first_player.nr = new_client_nr;
 534
 535   if (old_local_player != new_local_player)
 536   {
 537     /* set relevant player settings and change to new player */
 538
 539     local_player = new_local_player;
 540
 541     old_local_player->connected_locally = FALSE;
 542     new_local_player->connected_locally = TRUE;
 543
 544     old_local_player->connected_network = FALSE;
 545     new_local_player->connected_network = TRUE;
 546   }
 547
 548   if (first_player.nr > MAX_PLAYERS)
 549     Error(ERR_EXIT, "sorry, more than %d players not allowed", MAX_PLAYERS);
 550
 551   Error(ERR_NETWORK_CLIENT, "you get client # %d", new_client_nr);
 552
 553   stored_player[new_index_nr].connected_network = TRUE;
 554 }
 555
 556 static void Handle_OP_NUMBER_WANTED(void)
 557 {
 558   int old_client_nr    = getNetworkBuffer8BitInteger(read_buffer);
 559   int client_nr_wanted = getNetworkBuffer8BitInteger(read_buffer);
 560   int new_client_nr    = getNetworkBuffer8BitInteger(read_buffer);
 561   int old_index_nr = old_client_nr - 1;
 562   int new_index_nr = new_client_nr - 1;
 563   int index_nr_wanted = client_nr_wanted - 1;
 564   struct PlayerInfo *old_player = &stored_player[old_index_nr];
 565   struct PlayerInfo *new_player = &stored_player[new_index_nr];
 566
 567   printf("OP_NUMBER_WANTED: %d\n", old_client_nr);
 568
 569   if (new_client_nr == client_nr_wanted)        /* switching succeeded */
 570   {
 571     struct NetworkClientPlayerInfo *player;
 572
 573     if (old_client_nr != client_nr_wanted)      /* client's nr has changed */
 574       Error(ERR_NETWORK_CLIENT, "client %d switches to # %d",
 575             old_client_nr, new_client_nr);
 576     else if (old_client_nr == first_player.nr)  /* local player keeps his nr */
 577       Error(ERR_NETWORK_CLIENT, "keeping client # %d", new_client_nr);
 578
 579     if (old_client_nr != new_client_nr)
 580     {
 581       /* set relevant player settings and change to new player */
 582
 583       old_player->connected_network = FALSE;
 584       new_player->connected_network = TRUE;
 585     }
 586
 587     player = getNetworkPlayer(old_client_nr);
 588     player->nr = new_client_nr;
 589
 590     if (old_player == local_player)             /* local player switched */
 591     {
 592       local_player = new_player;
 593
 594       old_player->connected_locally = FALSE;
 595       new_player->connected_locally = TRUE;
 596     }
 597   }
 598   else if (old_client_nr == first_player.nr)    /* failed -- local player? */
 599   {
 600     char request[100];
 601
 602     sprintf(request, "Sorry! Player %d already exists! You are player %d!",
 603             index_nr_wanted + 1, new_index_nr + 1);
 604
 605     Request(request, REQ_CONFIRM);
 606
 607     Error(ERR_NETWORK_CLIENT, "cannot switch -- you keep client # %d",
 608           new_client_nr);
 609   }
 610
 611   if (game_status == GAME_MODE_MAIN)
 612     DrawNetworkPlayers();
 613 }
 614
 615 static void Handle_OP_PLAYER_NAME(void)
 616 {
 617   int player_nr = getNetworkBuffer8BitInteger(read_buffer);
 618   char *player_name = getNetworkBufferString(read_buffer);
 619   struct NetworkClientPlayerInfo *player = getNetworkPlayer(player_nr);
 620
 621   printf("OP_PLAYER_NAME: %d\n", player_nr);
 622
 623   strncpy(player->name, player_name, MAX_PLAYER_NAME_LEN);
 624   player->name[MAX_PLAYER_NAME_LEN] = '\0';
 625
 626   Error(ERR_NETWORK_CLIENT, "client %d calls itself \"%s\"",
 627         player_nr, player->name);
 628 }
 629
 630 static void Handle_OP_PLAYER_CONNECTED(void)
 631 {
 632   struct NetworkClientPlayerInfo *player, *last_player = NULL;
 633   int new_client_nr = getNetworkBuffer8BitInteger(read_buffer);
 634   int new_index_nr = new_client_nr - 1;
 635
 636   printf("OP_PLAYER_CONNECTED: %d\n", new_client_nr);
 637   Error(ERR_NETWORK_CLIENT, "new client %d connected", new_client_nr);
 638
 639   for (player = &first_player; player; player = player->next)
 640   {
 641     if (player->nr == new_client_nr)
 642       Error(ERR_EXIT, "multiplayer server sent duplicate player id");
 643
 644     last_player = player;
 645   }
 646
 647   last_player->next = player =
 648     checked_malloc(sizeof(struct NetworkClientPlayerInfo));
 649   player->nr = new_client_nr;
 650   player->name[0] = '\0';
 651   player->next = NULL;
 652
 653   stored_player[new_index_nr].connected_network = TRUE;
 654 }
 655
 656 static void Handle_OP_PLAYER_DISCONNECTED(void)
 657 {
 658   struct NetworkClientPlayerInfo *player, *player_disconnected;
 659   int player_nr = getNetworkBuffer8BitInteger(read_buffer);
 660   int index_nr = player_nr - 1;
 661
 662   printf("OP_PLAYER_DISCONNECTED: %d\n", player_nr);
 663   player_disconnected = getNetworkPlayer(player_nr);
 664   Error(ERR_NETWORK_CLIENT, "client %d (%s) disconnected",
 665         player_nr, getNetworkPlayerName(player_nr));
 666
 667   for (player = &first_player; player; player = player->next)
 668     if (player->next == player_disconnected)
 669       player->next = player_disconnected->next;
 670   free(player_disconnected);
 671
 672   stored_player[index_nr].connected_locally = FALSE;
 673   stored_player[index_nr].connected_network = FALSE;
 674
 675   if (game_status == GAME_MODE_PLAYING)
 676   {
 677     char message[100];
 678
 679     sprintf(message, "Player %d left network server! Network game stopped!",
 680             player_nr);
 681
 682     Request(message, REQ_CONFIRM | REQ_STAY_CLOSED);
 683
 684     SetGameStatus(GAME_MODE_MAIN);
 685
 686     DrawMainMenu();
 687   }
 688   else if (game_status == GAME_MODE_MAIN)
 689   {
 690     DrawNetworkPlayers();
 691   }
 692 }
 693
 694 static void Handle_OP_START_PLAYING(void)
 695 {
 696   int player_nr = getNetworkBuffer8BitInteger(read_buffer);
 697   char *new_leveldir_identifier = getNetworkBufferString(read_buffer);
 698   int new_level_nr = getNetworkBuffer16BitInteger(read_buffer);
 699   unsigned int new_random_seed = getNetworkBuffer32BitInteger(read_buffer);
 700
 701   if (!strEqual(new_leveldir_identifier, network_level.leveldir_identifier))
 702   {
 703     Error(ERR_WARN, "no such level identifier: '%s'", new_leveldir_identifier);
 704
 705     stop_network_game = TRUE;
 706
 707     return;
 708   }
 709
 710   printf("OP_START_PLAYING: %d\n", player_nr);
 711   Error(ERR_NETWORK_CLIENT,
 712         "client %d starts game [level %d from level identifier '%s']\n",
 713         player_nr, new_level_nr, new_leveldir_identifier);
 714
 715   LevelDirTree *new_leveldir =
 716     getTreeInfoFromIdentifier(leveldir_first, new_leveldir_identifier);
 717
 718   if (new_leveldir != NULL)
 719   {
 720     leveldir_current = new_leveldir;
 721     level_nr = new_level_nr;
 722   }
 723
 724   /* needed if level set of network game changed graphics, sounds or music */
 725   ReloadCustomArtwork(0);
 726
 727   TapeErase();
 728
 729   if (network_level.use_network_level_files)
 730     LoadNetworkLevel(&network_level);
 731   else
 732     LoadLevel(level_nr);
 733
 734   StartGameActions(FALSE, setup.autorecord, new_random_seed);
 735 }
 736
 737 static void Handle_OP_PAUSE_PLAYING(void)
 738 {
 739   int player_nr = getNetworkBuffer8BitInteger(read_buffer);
 740
 741   printf("OP_PAUSE_PLAYING: %d\n", player_nr);
 742   Error(ERR_NETWORK_CLIENT, "client %d pauses game", player_nr);
 743
 744   if (game_status == GAME_MODE_PLAYING)
 745   {
 746     tape.pausing = TRUE;
 747     DrawVideoDisplay(VIDEO_STATE_PAUSE_ON, 0);
 748   }
 749 }
 750
 751 static void Handle_OP_CONTINUE_PLAYING(void)
 752 {
 753   int player_nr = getNetworkBuffer8BitInteger(read_buffer);
 754
 755   printf("OP_CONTINUE_PLAYING: %d\n", player_nr);
 756   Error(ERR_NETWORK_CLIENT, "client %d continues game", player_nr);
 757
 758   if (game_status == GAME_MODE_PLAYING)
 759   {
 760     tape.pausing = FALSE;
 761     DrawVideoDisplay(VIDEO_STATE_PAUSE_OFF, 0);
 762   }
 763 }
 764
 765 static void Handle_OP_STOP_PLAYING(void)
 766 {
 767   int client_nr = getNetworkBuffer8BitInteger(read_buffer);
 768   int cause_for_stopping = getNetworkBuffer8BitInteger(read_buffer);
 769
 770   printf("OP_STOP_PLAYING: %d [%d]\n", client_nr, cause_for_stopping);
 771   Error(ERR_NETWORK_CLIENT, "client %d stops game [%d]",
 772         client_nr, cause_for_stopping);
 773
 774   if (game_status == GAME_MODE_PLAYING)
 775   {
 776     int index_nr = client_nr - 1;
 777     struct PlayerInfo *client_player = &stored_player[index_nr];
 778     boolean stopped_by_remote_player = (!client_player->connected_locally);
 779     char message[100];
 780
 781     if (cause_for_stopping == NETWORK_STOP_BY_PLAYER)
 782       sprintf(message, "Network game stopped by player %d!", client_nr);
 783     else
 784       sprintf(message, (cause_for_stopping == NETWORK_STOP_BY_ERROR ?
 785                         "Network game stopped due to internal error!" :
 786                         "Network game stopped!"));
 787
 788     if (cause_for_stopping != NETWORK_STOP_BY_PLAYER ||
 789         stopped_by_remote_player)
 790       Request(message, REQ_CONFIRM | REQ_STAY_CLOSED);
 791
 792     SetGameStatus(GAME_MODE_MAIN);
 793
 794     DrawMainMenu();
 795   }
 796 }
 797
 798 static void Handle_OP_MOVE_PLAYER(void)
 799 {
 800   int player_nr = getNetworkBuffer8BitInteger(read_buffer);
 801   int server_frame_counter = getNetworkBuffer32BitInteger(read_buffer);
 802   int i;
 803
 804   if (!network_playing)
 805     return;
 806
 807   if (server_frame_counter != FrameCounter)
 808   {
 809     Error(ERR_INFO, "frame counters of client %d and server out of sync",
 810           player_nr);
 811     Error(ERR_INFO, "frame counter of client is %d", FrameCounter);
 812     Error(ERR_INFO, "frame counter of server is %d", server_frame_counter);
 813     Error(ERR_INFO, "this should not happen -- please debug");
 814
 815     stop_network_game = TRUE;
 816
 817     return;
 818   }
 819
 820   /* copy valid player actions (will be set to 0 for not connected players) */
 821   for (i = 0; i < MAX_PLAYERS; i++)
 822     stored_player[i].effective_action =
 823       getNetworkBuffer8BitInteger(read_buffer);
 824
 825   network_player_action_received = TRUE;
 826 }
 827
 828 static void Handle_OP_BROADCAST_MESSAGE(void)
 829 {
 830   int player_nr = getNetworkBuffer8BitInteger(read_buffer);
 831
 832   printf("OP_BROADCAST_MESSAGE: %d\n", player_nr);
 833   Error(ERR_NETWORK_CLIENT, "client %d sends message", player_nr);
 834 }
 835
 836 static void Handle_OP_LEVEL_FILE(void)
 837 {
 838   int player_nr = getNetworkBuffer8BitInteger(read_buffer);
 839   char *leveldir_identifier;
 840   char *network_level_dir;
 841   struct LevelFileInfo *file_info = &network_level.file_info;
 842   struct LevelFileInfo *tmpl_info = &network_level.tmpl_info;
 843   boolean use_custom_template;
 844
 845   setString(&network_level.leveldir_identifier, NULL);
 846   setString(&network_level.file_info.basename,  NULL);
 847   setString(&network_level.file_info.filename,  NULL);
 848   setString(&network_level.tmpl_info.basename,  NULL);
 849   setString(&network_level.tmpl_info.filename,  NULL);
 850
 851   printf("OP_LEVEL_FILE: %d\n", player_nr);
 852
 853   leveldir_identifier = getStringCopy(getNetworkBufferString(read_buffer));
 854
 855   if (hasPathSeparator(leveldir_identifier))
 856     Error(ERR_EXIT, "protocol error: invalid filename from network client");
 857
 858   InitNetworkLevelDirectory(leveldir_identifier);
 859
 860   network_level_dir   = getNetworkLevelDir(leveldir_identifier);
 861
 862   file_info->nr       = getNetworkBuffer16BitInteger(read_buffer);
 863   file_info->type     = getNetworkBuffer8BitInteger(read_buffer);
 864   file_info->packed   = getNetworkBuffer8BitInteger(read_buffer);
 865   file_info->basename = getStringCopy(getNetworkBufferString(read_buffer));
 866   file_info->filename = getPath2(network_level_dir, file_info->basename);
 867
 868   if (hasPathSeparator(file_info->basename))
 869     Error(ERR_EXIT, "protocol error: invalid filename from network client");
 870
 871   getNetworkBufferFile(read_buffer, file_info->filename);
 872
 873   use_custom_template = getNetworkBuffer8BitInteger(read_buffer);
 874   if (use_custom_template)
 875   {
 876     *tmpl_info = *file_info;
 877
 878     tmpl_info->basename = getStringCopy(getNetworkBufferString(read_buffer));
 879     tmpl_info->filename = getPath2(network_level_dir, tmpl_info->basename);
 880
 881     if (hasPathSeparator(tmpl_info->basename))
 882       Error(ERR_EXIT, "protocol error: invalid filename from network client");
 883
 884     getNetworkBufferFile(read_buffer, tmpl_info->filename);
 885   }
 886
 887   network_level.leveldir_identifier = leveldir_identifier;
 888   network_level.use_custom_template = use_custom_template;
 889
 890   /* the receiving client(s) use(s) the transferred network level files */
 891   network_level.use_network_level_files = TRUE;
 892
 893 #if 0
 894   printf("::: '%s'\n", leveldir_identifier);
 895   printf("::: '%d'\n", file_info->nr);
 896   printf("::: '%d'\n", file_info->type);
 897   printf("::: '%d'\n", file_info->packed);
 898   printf("::: '%s'\n", file_info->basename);
 899   printf("::: '%s'\n", file_info->filename);
 900
 901   if (use_custom_template)
 902     printf("::: '%s'\n", tmpl_info->filename);
 903 #endif
 904 }
 905
 906 static void HandleNetworkingMessage(void)
 907 {
 908   stop_network_game = FALSE;
 909
 910   initNetworkBufferForReading(read_buffer);
 911
 912   int message_type = getNetworkBuffer8BitInteger(read_buffer);
 913
 914   switch (message_type)
 915   {
 916     case OP_BAD_PROTOCOL_VERSION:
 917       Handle_OP_BAD_PROTOCOL_VERSION();
 918       break;
 919
 920     case OP_YOUR_NUMBER:
 921       Handle_OP_YOUR_NUMBER();
 922       break;
 923
 924     case OP_NUMBER_WANTED:
 925       Handle_OP_NUMBER_WANTED();
 926       break;
 927
 928     case OP_PLAYER_NAME:
 929       Handle_OP_PLAYER_NAME();
 930       break;
 931
 932     case OP_PLAYER_CONNECTED:
 933       Handle_OP_PLAYER_CONNECTED();
 934       break;
 935
 936     case OP_PLAYER_DISCONNECTED:
 937       Handle_OP_PLAYER_DISCONNECTED();
 938       break;
 939
 940     case OP_START_PLAYING:
 941       Handle_OP_START_PLAYING();
 942       break;
 943
 944     case OP_PAUSE_PLAYING:
 945       Handle_OP_PAUSE_PLAYING();
 946       break;
 947
 948     case OP_CONTINUE_PLAYING:
 949       Handle_OP_CONTINUE_PLAYING();
 950       break;
 951
 952     case OP_STOP_PLAYING:
 953       Handle_OP_STOP_PLAYING();
 954       break;
 955
 956     case OP_MOVE_PLAYER:
 957       Handle_OP_MOVE_PLAYER();
 958       break;
 959
 960     case OP_BROADCAST_MESSAGE:
 961       Handle_OP_BROADCAST_MESSAGE();
 962       break;
 963
 964     case OP_LEVEL_FILE:
 965       Handle_OP_LEVEL_FILE();
 966       break;
 967
 968     default:
 969       if (options.verbose)
 970         Error(ERR_NETWORK_CLIENT,
 971               "unknown opcode %d from server", message_type);
 972   }
 973
 974   fflush(stdout);
 975
 976   /* in case of internal error, stop network game */
 977   if (stop_network_game)
 978     SendToServer_StopPlaying(NETWORK_STOP_BY_ERROR);
 979 }
 980
 981 static char *HandleNetworkingPackets(void)
 982 {
 983   while (1)
 984   {
 985     /* ---------- check network server for activity ---------- */
 986
 987     int num_active_sockets = SDLNet_CheckSockets(rfds, 0);
 988
 989     if (num_active_sockets < 0)
 990       return "Error checking network sockets!";
 991
 992     if (num_active_sockets == 0)
 993       break;    // no active sockets, stop here
 994
 995     /* ---------- read packets from network server ---------- */
 996
 997     initNetworkBufferForReceiving(read_buffer);
 998
 999     int num_bytes = receiveNetworkBufferPacket(read_buffer, sfd);
1000
1001     if (num_bytes < 0)
1002       return "Error reading from network server!";
1003
1004     if (num_bytes == 0)
1005       return "Connection to network server lost!";
1006
1007     HandleNetworkingMessage();
1008
1009     if (stop_network_client)
1010       return stop_network_client_message;
1011   }
1012
1013   return NULL;
1014 }
1015
1016 static void FreeNetworkClientPlayerInfo(struct NetworkClientPlayerInfo *player)
1017 {
1018   if (player == NULL)
1019     return;
1020
1021   if (player->next)
1022     FreeNetworkClientPlayerInfo(player->next);
1023
1024   checked_free(player);
1025 }
1026
1027 static void HandleNetworkingDisconnect(void)
1028 {
1029   int i;
1030
1031   SDLNet_TCP_DelSocket(rfds, sfd);
1032   SDLNet_TCP_Close(sfd);
1033
1034   network_playing = FALSE;
1035
1036   network.enabled = FALSE;
1037   network.connected = FALSE;
1038
1039   setup.network_mode = FALSE;
1040
1041   for (i = 0; i < MAX_PLAYERS; i++)
1042     stored_player[i].connected_network = FALSE;
1043
1044   FreeNetworkClientPlayerInfo(first_player.next);
1045
1046   first_player.nr = 0;
1047   first_player.next = NULL;
1048 }
1049
1050 void HandleNetworking(void)
1051 {
1052   char *error_message = HandleNetworkingPackets();
1053
1054   if (error_message != NULL)
1055   {
1056     HandleNetworkingDisconnect();
1057
1058     if (game_status == GAME_MODE_PLAYING)
1059     {
1060       Request(error_message, REQ_CONFIRM | REQ_STAY_CLOSED);
1061
1062       SetGameStatus(GAME_MODE_MAIN);
1063
1064       DrawMainMenu();
1065     }
1066     else
1067     {
1068       Request(error_message, REQ_CONFIRM);
1069
1070       if (game_status == GAME_MODE_MAIN)
1071         ClearNetworkPlayers();
1072     }
1073   }
1074 }
1075
1076 void DisconnectFromNetworkServer(void)
1077 {
1078   DrawNetworkText_Title("Terminating Network");
1079   DrawNetworkText("Disconnecting from network server ...");
1080
1081   HandleNetworkingDisconnect();
1082
1083   DrawNetworkText_Success("Successfully disconnected!");
1084 }