1 // ============================================================================
2 // Rocks'n'Diamonds - McDuffin Strikes Back!
3 // ----------------------------------------------------------------------------
4 // (c) 1995-2014 by Artsoft Entertainment
7 // http://www.artsoft.org/
8 // ----------------------------------------------------------------------------
10 // ============================================================================
12 #include "libgame/platform.h"
14 #if defined(NETWORK_AVALIABLE)
21 #include "libgame/libgame.h"
31 struct NetworkClientPlayerInfo
34 char name[MAX_PLAYER_NAME_LEN + 1];
35 struct NetworkClientPlayerInfo *next;
38 static struct NetworkClientPlayerInfo first_player =
47 static TCPsocket sfd; /* TCP server socket */
48 static UDPsocket udp; /* UDP server socket */
49 static SDLNet_SocketSet rfds; /* socket set */
51 static byte realbuffer[512];
52 static byte readbuffer[MAX_BUFFER_SIZE], writbuffer[MAX_BUFFER_SIZE];
53 static byte *buffer = realbuffer + 4;
54 static int nread = 0, nwrite = 0;
55 static boolean stop_network_game = FALSE;
57 static void SendBufferToServer(int size)
62 realbuffer[0] = realbuffer[1] = realbuffer[2] = 0;
63 realbuffer[3] = (byte)size;
66 if (nwrite + 4 + size >= MAX_BUFFER_SIZE)
67 Error(ERR_EXIT, "internal error: network send buffer overflow");
69 memcpy(writbuffer + nwrite, realbuffer, 4 + size);
72 /* directly send the buffer to the network server */
73 SDLNet_TCP_Send(sfd, writbuffer, nwrite);
77 struct NetworkClientPlayerInfo *getNetworkPlayer(int player_nr)
79 struct NetworkClientPlayerInfo *player = NULL;
81 for (player = &first_player; player; player = player->next)
82 if (player->nr == player_nr)
85 if (player == NULL) /* should not happen */
86 Error(ERR_EXIT, "protocol error: reference to non-existing player %d",
92 char *getNetworkPlayerName(int player_nr)
94 struct NetworkClientPlayerInfo *player;
97 return("the network game server");
98 else if (player_nr == first_player.nr)
101 for (player = &first_player; player; player = player->next)
102 if (player->nr == player_nr && strlen(player->name) > 0)
103 return(player->name);
105 return(EMPTY_PLAYER_NAME);
108 static void StartNetworkServer(int port)
113 #if defined(TARGET_SDL2)
114 server_thread = SDL_CreateThread(NetworkServerThread,
115 "NetworkServerThread", &p);
117 server_thread = SDL_CreateThread(NetworkServerThread, &p);
119 network_server = TRUE;
122 boolean ConnectToServer(char *hostname, int port)
129 port = DEFAULT_SERVER_PORT;
131 if (hostname == NULL)
133 // if no hostname given, try to auto-detect network server in local network
134 // by doing a UDP broadcast on the network server port and wait for answer
136 SDLNet_SocketSet udp_socket_set = SDLNet_AllocSocketSet(1);
138 Error(ERR_EXIT, "SDLNet_AllocSocketSet() failed: %s"), SDLNet_GetError();
140 udp = SDLNet_UDP_Open(0);
142 Error(ERR_EXIT, "SDLNet_UDP_Open() failed: %s", SDLNet_GetError());
144 if (SDLNet_UDP_AddSocket(udp_socket_set, udp) == -1)
145 Error(ERR_EXIT_NETWORK_SERVER, "SDLNet_TCP_AddSocket() failed: %s"),
148 char *data_ptr = "network server UDB broadcast";
149 int data_len = strlen(data_ptr) + 1;
150 IPaddress ip_address;
152 SDLNet_Write32(0xffffffff, &ip_address.host); /* 255.255.255.255 */
153 SDLNet_Write16(port, &ip_address.port);
165 SDLNet_UDP_Send(udp, -1, &packet);
167 Error(ERR_DEBUG, "doing UDP broadcast for local network server ...");
169 if (SDLNet_CheckSockets(udp_socket_set, 1000) == 1)
171 int num_packets = SDLNet_UDP_Recv(udp, &packet);
173 if (num_packets == 1)
175 Error(ERR_DEBUG, "network server found");
177 server_host = SDLNet_Read32(&packet.address.host);
181 Error(ERR_DEBUG, "no answer from network server");
186 Error(ERR_DEBUG, "no network server found");
190 rfds = SDLNet_AllocSocketSet(1);
194 SDLNet_ResolveHost(&ip, hostname, port);
196 if (ip.host == INADDR_NONE)
197 Error(ERR_EXIT, "cannot locate host '%s'", hostname);
199 server_host = SDLNet_Read32(&ip.host);
203 // if no hostname was given and no network server was auto-detected in the
204 // local network, try to connect to a network server at the local host
205 if (server_host == 0)
206 server_host = 0x7f000001; /* 127.0.0.1 */
208 SDLNet_Write32(server_host, &ip.host);
209 SDLNet_Write16(port, &ip.port);
212 Error(ERR_DEBUG, "trying to connect to network server at %d.%d.%d.%d ...",
213 (server_host >> 24) & 0xff,
214 (server_host >> 16) & 0xff,
215 (server_host >> 8) & 0xff,
216 (server_host >> 0) & 0xff);
218 sfd = SDLNet_TCP_Open(&ip);
222 SDLNet_TCP_AddSocket(rfds, sfd);
227 printf("SDLNet_TCP_Open(): %s\n", SDLNet_GetError());
230 if (hostname) /* connect to specified server failed */
233 printf("No rocksndiamonds server on localhost -- starting up one ...\n");
234 StartNetworkServer(port);
236 /* wait for server to start up and try connecting several times */
237 for (i = 0; i < 6; i++)
239 Delay(500); /* wait 500 ms == 0.5 seconds */
241 if ((sfd = SDLNet_TCP_Open(&ip))) /* connected */
243 SDLNet_TCP_AddSocket(rfds, sfd);
248 /* when reaching this point, connect to newly started server has failed */
252 void SendToServer_PlayerName(char *player_name)
254 int len_player_name = strlen(player_name);
256 buffer[1] = OP_PLAYER_NAME;
257 memcpy(&buffer[2], player_name, len_player_name);
258 SendBufferToServer(2 + len_player_name);
259 Error(ERR_NETWORK_CLIENT, "you set your player name to \"%s\"", player_name);
262 void SendToServer_ProtocolVersion()
264 buffer[1] = OP_PROTOCOL_VERSION;
265 buffer[2] = PROTOCOL_VERSION_1;
266 buffer[3] = PROTOCOL_VERSION_2;
267 buffer[4] = PROTOCOL_VERSION_3;
269 SendBufferToServer(5);
272 void SendToServer_NrWanted(int nr_wanted)
274 buffer[1] = OP_NUMBER_WANTED;
275 buffer[2] = nr_wanted;
277 SendBufferToServer(3);
280 void SendToServer_StartPlaying()
282 unsigned int new_random_seed = InitRND(level.random_seed);
284 int dummy = 0; /* !!! HAS NO MEANING ANYMORE !!! */
285 /* the name of the level must be enough */
287 buffer[1] = OP_START_PLAYING;
288 buffer[2] = (byte)(level_nr >> 8);
289 buffer[3] = (byte)(level_nr & 0xff);
290 buffer[4] = (byte)(dummy >> 8);
291 buffer[5] = (byte)(dummy & 0xff);
293 buffer[6] = (unsigned char)((new_random_seed >> 24) & 0xff);
294 buffer[7] = (unsigned char)((new_random_seed >> 16) & 0xff);
295 buffer[8] = (unsigned char)((new_random_seed >> 8) & 0xff);
296 buffer[9] = (unsigned char)((new_random_seed >> 0) & 0xff);
298 strcpy((char *)&buffer[10], leveldir_current->identifier);
300 SendBufferToServer(10 + strlen(leveldir_current->identifier) + 1);
303 void SendToServer_PausePlaying()
305 buffer[1] = OP_PAUSE_PLAYING;
307 SendBufferToServer(2);
310 void SendToServer_ContinuePlaying()
312 buffer[1] = OP_CONTINUE_PLAYING;
314 SendBufferToServer(2);
317 void SendToServer_StopPlaying(int cause_for_stopping)
319 buffer[1] = OP_STOP_PLAYING;
320 buffer[2] = cause_for_stopping;
322 SendBufferToServer(3);
325 void SendToServer_MovePlayer(byte player_action)
327 buffer[1] = OP_MOVE_PLAYER;
328 buffer[2] = player_action;
330 SendBufferToServer(3);
333 static void Handle_OP_BAD_PROTOCOL_VERSION()
335 Error(ERR_WARN, "protocol version mismatch");
336 Error(ERR_EXIT, "server expects %d.%d.x instead of %d.%d.%d",
337 buffer[2], buffer[3],
338 PROTOCOL_VERSION_1, PROTOCOL_VERSION_2, PROTOCOL_VERSION_3);
341 static void Handle_OP_YOUR_NUMBER()
343 int new_client_nr = buffer[2];
344 int new_index_nr = new_client_nr - 1;
345 struct PlayerInfo *old_local_player = local_player;
346 struct PlayerInfo *new_local_player = &stored_player[new_index_nr];
348 printf("OP_YOUR_NUMBER: %d\n", buffer[0]);
349 first_player.nr = new_client_nr;
351 if (old_local_player != new_local_player)
353 /* set relevant player settings and change to new player */
355 local_player = new_local_player;
357 old_local_player->connected_locally = FALSE;
358 new_local_player->connected_locally = TRUE;
360 old_local_player->connected_network = FALSE;
361 new_local_player->connected_network = TRUE;
364 if (first_player.nr > MAX_PLAYERS)
365 Error(ERR_EXIT, "sorry, more than %d players not allowed", MAX_PLAYERS);
367 Error(ERR_NETWORK_CLIENT, "you get client # %d", new_client_nr);
370 static void Handle_OP_NUMBER_WANTED()
372 int client_nr_wanted = buffer[2];
373 int old_client_nr = buffer[0];
374 int new_client_nr = buffer[3];
375 int old_index_nr = old_client_nr - 1;
376 int new_index_nr = new_client_nr - 1;
377 int index_nr_wanted = client_nr_wanted - 1;
378 struct PlayerInfo *old_player = &stored_player[old_index_nr];
379 struct PlayerInfo *new_player = &stored_player[new_index_nr];
381 printf("OP_NUMBER_WANTED: %d\n", buffer[0]);
383 if (new_client_nr == client_nr_wanted) /* switching succeeded */
385 struct NetworkClientPlayerInfo *player;
387 if (old_client_nr != client_nr_wanted) /* client's nr has changed */
388 Error(ERR_NETWORK_CLIENT, "client %d switches to # %d",
389 old_client_nr, new_client_nr);
390 else if (old_client_nr == first_player.nr) /* local player keeps his nr */
391 Error(ERR_NETWORK_CLIENT, "keeping client # %d", new_client_nr);
393 if (old_client_nr != new_client_nr)
395 /* set relevant player settings and change to new player */
397 old_player->connected_network = FALSE;
398 new_player->connected_network = TRUE;
401 player = getNetworkPlayer(old_client_nr);
402 player->nr = new_client_nr;
404 if (old_player == local_player) /* local player switched */
406 local_player = new_player;
408 old_player->connected_locally = FALSE;
409 new_player->connected_locally = TRUE;
412 else if (old_client_nr == first_player.nr) /* failed -- local player? */
416 sprintf(request, "Sorry! Player %d already exists! You are player %d!",
417 index_nr_wanted + 1, new_index_nr + 1);
419 Request(request, REQ_CONFIRM);
421 Error(ERR_NETWORK_CLIENT, "cannot switch -- you keep client # %d",
426 static void Handle_OP_PLAYER_NAME(unsigned int len)
428 struct NetworkClientPlayerInfo *player;
429 int player_nr = (int)buffer[0];
431 printf("OP_PLAYER_NAME: %d\n", player_nr);
432 player = getNetworkPlayer(player_nr);
434 Error(ERR_NETWORK_CLIENT, "client %d calls itself \"%s\"",
435 buffer[0], &buffer[2]);
436 strncpy(player->name, (char *)&buffer[2], MAX_PLAYER_NAME_LEN);
439 static void Handle_OP_PLAYER_CONNECTED()
441 struct NetworkClientPlayerInfo *player, *last_player = NULL;
442 int new_client_nr = (int)buffer[0];
443 int new_index_nr = new_client_nr - 1;
445 printf("OP_PLAYER_CONNECTED: %d\n", new_client_nr);
446 Error(ERR_NETWORK_CLIENT, "new client %d connected", new_client_nr);
448 for (player = &first_player; player; player = player->next)
450 if (player->nr == new_client_nr)
451 Error(ERR_EXIT, "multiplayer server sent duplicate player id");
453 last_player = player;
456 last_player->next = player =
457 checked_malloc(sizeof(struct NetworkClientPlayerInfo));
458 player->nr = new_client_nr;
459 player->name[0] = '\0';
462 stored_player[new_index_nr].connected_network = TRUE;
465 static void Handle_OP_PLAYER_DISCONNECTED()
467 struct NetworkClientPlayerInfo *player, *player_disconnected;
468 int player_nr = (int)buffer[0];
469 int index_nr = player_nr - 1;
471 printf("OP_PLAYER_DISCONNECTED: %d\n", player_nr);
472 player_disconnected = getNetworkPlayer(player_nr);
473 Error(ERR_NETWORK_CLIENT, "client %d (%s) disconnected",
474 player_nr, getNetworkPlayerName(buffer[0]));
476 for (player = &first_player; player; player = player->next)
477 if (player->next == player_disconnected)
478 player->next = player_disconnected->next;
479 free(player_disconnected);
481 stored_player[index_nr].connected_locally = FALSE;
482 stored_player[index_nr].connected_network = FALSE;
485 static void Handle_OP_START_PLAYING()
487 LevelDirTree *new_leveldir;
489 unsigned int new_random_seed;
490 char *new_leveldir_identifier;
492 new_level_nr = (buffer[2] << 8) + buffer[3];
494 (buffer[6] << 24) | (buffer[7] << 16) | (buffer[8] << 8) | (buffer[9]);
495 new_leveldir_identifier = (char *)&buffer[10];
497 new_leveldir = getTreeInfoFromIdentifier(leveldir_first,
498 new_leveldir_identifier);
499 if (new_leveldir == NULL)
501 Error(ERR_WARN, "no such level identifier: '%s'", new_leveldir_identifier);
503 new_leveldir = leveldir_first;
504 Error(ERR_WARN, "using default level set: '%s'", new_leveldir->identifier);
507 printf("OP_START_PLAYING: %d\n", buffer[0]);
508 Error(ERR_NETWORK_CLIENT,
509 "client %d starts game [level %d from level identifier '%s']\n",
510 buffer[0], new_level_nr, new_leveldir->identifier);
512 leveldir_current = new_leveldir;
513 level_nr = new_level_nr;
519 StartGameActions(FALSE, setup.autorecord, new_random_seed);
522 static void Handle_OP_PAUSE_PLAYING()
524 printf("OP_PAUSE_PLAYING: %d\n", buffer[0]);
525 Error(ERR_NETWORK_CLIENT, "client %d pauses game", buffer[0]);
528 DrawVideoDisplay(VIDEO_STATE_PAUSE_ON,0);
531 static void Handle_OP_CONTINUE_PLAYING()
533 printf("OP_CONTINUE_PLAYING: %d\n", buffer[0]);
534 Error(ERR_NETWORK_CLIENT, "client %d continues game", buffer[0]);
536 tape.pausing = FALSE;
537 DrawVideoDisplay(VIDEO_STATE_PAUSE_OFF,0);
540 static void Handle_OP_STOP_PLAYING()
542 printf("OP_STOP_PLAYING: %d [%d]\n", buffer[0], buffer[2]);
543 Error(ERR_NETWORK_CLIENT, "client %d stops game [%d]", buffer[0], buffer[2]);
545 if (game_status == GAME_MODE_PLAYING)
547 int client_nr = buffer[0];
548 int index_nr = client_nr - 1;
549 boolean stopped_by_remote_player = (index_nr != local_player->index_nr);
550 char *message = (buffer[2] == NETWORK_STOP_BY_PLAYER ?
551 "Network game stopped by player!" :
552 buffer[2] == NETWORK_STOP_BY_ERROR ?
553 "Network game stopped due to internal error!" :
554 "Network game stopped!");
556 if (buffer[2] != NETWORK_STOP_BY_PLAYER || stopped_by_remote_player)
557 Request(message, REQ_CONFIRM | REQ_STAY_CLOSED);
560 SetGameStatus(GAME_MODE_MAIN);
565 static void Handle_OP_MOVE_PLAYER(unsigned int len)
567 int server_frame_counter;
570 if (!network_playing)
573 server_frame_counter =
574 (buffer[2] << 24) | (buffer[3] << 16) | (buffer[4] << 8) | (buffer[5]);
576 if (server_frame_counter != FrameCounter)
578 Error(ERR_INFO, "client and servers frame counters out of sync");
579 Error(ERR_INFO, "frame counter of client is %d", FrameCounter);
580 Error(ERR_INFO, "frame counter of server is %d", server_frame_counter);
581 Error(ERR_INFO, "this should not happen -- please debug");
583 stop_network_game = TRUE;
588 /* copy valid player actions */
589 for (i = 0; i < MAX_PLAYERS; i++)
590 stored_player[i].effective_action =
591 (i < len - 6 ? buffer[6 + i] : 0);
593 network_player_action_received = TRUE;
596 static void HandleNetworkingMessages()
598 unsigned int message_length;
600 stop_network_game = FALSE;
602 while (nread >= 4 && nread >= 4 + readbuffer[3])
604 message_length = readbuffer[3];
605 if (readbuffer[0] || readbuffer[1] || readbuffer[2])
606 Error(ERR_EXIT, "wrong network server line length");
608 memcpy(buffer, &readbuffer[4], message_length);
609 nread -= 4 + message_length;
610 memmove(readbuffer, readbuffer + 4 + message_length, nread);
614 case OP_BAD_PROTOCOL_VERSION:
615 Handle_OP_BAD_PROTOCOL_VERSION();
619 Handle_OP_YOUR_NUMBER();
622 case OP_NUMBER_WANTED:
623 Handle_OP_NUMBER_WANTED();
627 Handle_OP_PLAYER_NAME(message_length);
630 case OP_PLAYER_CONNECTED:
631 Handle_OP_PLAYER_CONNECTED();
634 case OP_PLAYER_DISCONNECTED:
635 Handle_OP_PLAYER_DISCONNECTED();
638 case OP_START_PLAYING:
639 Handle_OP_START_PLAYING();
642 case OP_PAUSE_PLAYING:
643 Handle_OP_PAUSE_PLAYING();
646 case OP_CONTINUE_PLAYING:
647 Handle_OP_CONTINUE_PLAYING();
650 case OP_STOP_PLAYING:
651 Handle_OP_STOP_PLAYING();
655 Handle_OP_MOVE_PLAYER(message_length);
658 case OP_BROADCAST_MESSAGE:
659 printf("OP_BROADCAST_MESSAGE: %d\n", buffer[0]);
660 Error(ERR_NETWORK_CLIENT, "client %d sends message", buffer[0]);
667 /* in case of internal error, stop network game */
668 if (stop_network_game)
669 SendToServer_StopPlaying(NETWORK_STOP_BY_ERROR);
674 void HandleNetworking()
680 if ((r = SDLNet_CheckSockets(rfds, 1)) < 0)
681 Error(ERR_EXIT, "HandleNetworking(): SDLNet_CheckSockets() failed");
685 r = SDLNet_TCP_Recv(sfd, readbuffer + nread, 1);
688 Error(ERR_EXIT, "error reading from network server");
691 Error(ERR_EXIT, "connection to network server lost");
695 HandleNetworkingMessages();
701 #endif /* NETWORK_AVALIABLE */