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; /* server socket */
48 static SDLNet_SocketSet rfds; /* socket set */
50 static byte realbuffer[512];
51 static byte readbuffer[MAX_BUFFER_SIZE], writbuffer[MAX_BUFFER_SIZE];
52 static byte *buffer = realbuffer + 4;
53 static int nread = 0, nwrite = 0;
54 static boolean stop_network_game = FALSE;
56 static void SendBufferToServer(int size)
61 realbuffer[0] = realbuffer[1] = realbuffer[2] = 0;
62 realbuffer[3] = (byte)size;
65 if (nwrite + 4 + size >= MAX_BUFFER_SIZE)
66 Error(ERR_EXIT, "internal error: network send buffer overflow");
68 memcpy(writbuffer + nwrite, realbuffer, 4 + size);
71 /* directly send the buffer to the network server */
72 SDLNet_TCP_Send(sfd, writbuffer, nwrite);
76 struct NetworkClientPlayerInfo *getNetworkPlayer(int player_nr)
78 struct NetworkClientPlayerInfo *player = NULL;
80 for (player = &first_player; player; player = player->next)
81 if (player->nr == player_nr)
84 if (player == NULL) /* should not happen */
85 Error(ERR_EXIT, "protocol error: reference to non-existing player %d",
91 char *getNetworkPlayerName(int player_nr)
93 struct NetworkClientPlayerInfo *player;
96 return("the network game server");
97 else if (player_nr == first_player.nr)
100 for (player = &first_player; player; player = player->next)
101 if (player->nr == player_nr && strlen(player->name) > 0)
102 return(player->name);
104 return(EMPTY_PLAYER_NAME);
107 static void StartNetworkServer(int port)
112 #if defined(TARGET_SDL2)
113 server_thread = SDL_CreateThread(NetworkServerThread,
114 "NetworkServerThread", &p);
116 server_thread = SDL_CreateThread(NetworkServerThread, &p);
118 network_server = TRUE;
121 boolean ConnectToServer(char *hostname, int port)
127 port = DEFAULT_SERVER_PORT;
129 rfds = SDLNet_AllocSocketSet(1);
133 SDLNet_ResolveHost(&ip, hostname, port);
134 if (ip.host == INADDR_NONE)
135 Error(ERR_EXIT, "cannot locate host '%s'", hostname);
139 SDLNet_Write32(0x7f000001, &ip.host); /* 127.0.0.1 */
140 SDLNet_Write16(port, &ip.port);
143 sfd = SDLNet_TCP_Open(&ip);
147 SDLNet_TCP_AddSocket(rfds, sfd);
152 printf("SDLNet_TCP_Open(): %s\n", SDLNet_GetError());
155 if (hostname) /* connect to specified server failed */
158 printf("No rocksndiamonds server on localhost -- starting up one ...\n");
159 StartNetworkServer(port);
161 /* wait for server to start up and try connecting several times */
162 for (i = 0; i < 6; i++)
164 Delay(500); /* wait 500 ms == 0.5 seconds */
166 if ((sfd = SDLNet_TCP_Open(&ip))) /* connected */
168 SDLNet_TCP_AddSocket(rfds, sfd);
173 /* when reaching this point, connect to newly started server has failed */
177 void SendToServer_PlayerName(char *player_name)
179 int len_player_name = strlen(player_name);
181 buffer[1] = OP_PLAYER_NAME;
182 memcpy(&buffer[2], player_name, len_player_name);
183 SendBufferToServer(2 + len_player_name);
184 Error(ERR_NETWORK_CLIENT, "you set your player name to \"%s\"", player_name);
187 void SendToServer_ProtocolVersion()
189 buffer[1] = OP_PROTOCOL_VERSION;
190 buffer[2] = PROTOCOL_VERSION_1;
191 buffer[3] = PROTOCOL_VERSION_2;
192 buffer[4] = PROTOCOL_VERSION_3;
194 SendBufferToServer(5);
197 void SendToServer_NrWanted(int nr_wanted)
199 buffer[1] = OP_NUMBER_WANTED;
200 buffer[2] = nr_wanted;
202 SendBufferToServer(3);
205 void SendToServer_StartPlaying()
207 unsigned int new_random_seed = InitRND(level.random_seed);
209 int dummy = 0; /* !!! HAS NO MEANING ANYMORE !!! */
210 /* the name of the level must be enough */
212 buffer[1] = OP_START_PLAYING;
213 buffer[2] = (byte)(level_nr >> 8);
214 buffer[3] = (byte)(level_nr & 0xff);
215 buffer[4] = (byte)(dummy >> 8);
216 buffer[5] = (byte)(dummy & 0xff);
218 buffer[6] = (unsigned char)((new_random_seed >> 24) & 0xff);
219 buffer[7] = (unsigned char)((new_random_seed >> 16) & 0xff);
220 buffer[8] = (unsigned char)((new_random_seed >> 8) & 0xff);
221 buffer[9] = (unsigned char)((new_random_seed >> 0) & 0xff);
223 strcpy((char *)&buffer[10], leveldir_current->identifier);
225 SendBufferToServer(10 + strlen(leveldir_current->identifier) + 1);
228 void SendToServer_PausePlaying()
230 buffer[1] = OP_PAUSE_PLAYING;
232 SendBufferToServer(2);
235 void SendToServer_ContinuePlaying()
237 buffer[1] = OP_CONTINUE_PLAYING;
239 SendBufferToServer(2);
242 void SendToServer_StopPlaying(int cause_for_stopping)
244 buffer[1] = OP_STOP_PLAYING;
245 buffer[2] = cause_for_stopping;
247 SendBufferToServer(3);
250 void SendToServer_MovePlayer(byte player_action)
252 buffer[1] = OP_MOVE_PLAYER;
253 buffer[2] = player_action;
255 SendBufferToServer(3);
258 static void Handle_OP_BAD_PROTOCOL_VERSION()
260 Error(ERR_WARN, "protocol version mismatch");
261 Error(ERR_EXIT, "server expects %d.%d.x instead of %d.%d.%d",
262 buffer[2], buffer[3],
263 PROTOCOL_VERSION_1, PROTOCOL_VERSION_2, PROTOCOL_VERSION_3);
266 static void Handle_OP_YOUR_NUMBER()
268 int new_client_nr = buffer[2];
269 int new_index_nr = new_client_nr - 1;
270 struct PlayerInfo *old_local_player = local_player;
271 struct PlayerInfo *new_local_player = &stored_player[new_index_nr];
273 printf("OP_YOUR_NUMBER: %d\n", buffer[0]);
274 first_player.nr = new_client_nr;
276 if (old_local_player != new_local_player)
278 /* set relevant player settings and change to new player */
280 local_player = new_local_player;
282 old_local_player->connected_locally = FALSE;
283 new_local_player->connected_locally = TRUE;
285 old_local_player->connected_network = FALSE;
286 new_local_player->connected_network = TRUE;
289 if (first_player.nr > MAX_PLAYERS)
290 Error(ERR_EXIT, "sorry, more than %d players not allowed", MAX_PLAYERS);
292 Error(ERR_NETWORK_CLIENT, "you get client # %d", new_client_nr);
295 static void Handle_OP_NUMBER_WANTED()
297 int client_nr_wanted = buffer[2];
298 int old_client_nr = buffer[0];
299 int new_client_nr = buffer[3];
300 int old_index_nr = old_client_nr - 1;
301 int new_index_nr = new_client_nr - 1;
302 int index_nr_wanted = client_nr_wanted - 1;
303 struct PlayerInfo *old_player = &stored_player[old_index_nr];
304 struct PlayerInfo *new_player = &stored_player[new_index_nr];
306 printf("OP_NUMBER_WANTED: %d\n", buffer[0]);
308 if (new_client_nr == client_nr_wanted) /* switching succeeded */
310 struct NetworkClientPlayerInfo *player;
312 if (old_client_nr != client_nr_wanted) /* client's nr has changed */
313 Error(ERR_NETWORK_CLIENT, "client %d switches to # %d",
314 old_client_nr, new_client_nr);
315 else if (old_client_nr == first_player.nr) /* local player keeps his nr */
316 Error(ERR_NETWORK_CLIENT, "keeping client # %d", new_client_nr);
318 if (old_client_nr != new_client_nr)
320 /* set relevant player settings and change to new player */
322 old_player->connected_network = FALSE;
323 new_player->connected_network = TRUE;
326 player = getNetworkPlayer(old_client_nr);
327 player->nr = new_client_nr;
329 if (old_player == local_player) /* local player switched */
331 local_player = new_player;
333 old_player->connected_locally = FALSE;
334 new_player->connected_locally = TRUE;
337 else if (old_client_nr == first_player.nr) /* failed -- local player? */
341 sprintf(request, "Sorry! Player %d already exists! You are player %d!",
342 index_nr_wanted + 1, new_index_nr + 1);
344 Request(request, REQ_CONFIRM);
346 Error(ERR_NETWORK_CLIENT, "cannot switch -- you keep client # %d",
351 static void Handle_OP_PLAYER_NAME(unsigned int len)
353 struct NetworkClientPlayerInfo *player;
354 int player_nr = (int)buffer[0];
356 printf("OP_PLAYER_NAME: %d\n", player_nr);
357 player = getNetworkPlayer(player_nr);
359 Error(ERR_NETWORK_CLIENT, "client %d calls itself \"%s\"",
360 buffer[0], &buffer[2]);
361 strncpy(player->name, (char *)&buffer[2], MAX_PLAYER_NAME_LEN);
364 static void Handle_OP_PLAYER_CONNECTED()
366 struct NetworkClientPlayerInfo *player, *last_player = NULL;
367 int new_client_nr = (int)buffer[0];
368 int new_index_nr = new_client_nr - 1;
370 printf("OP_PLAYER_CONNECTED: %d\n", new_client_nr);
371 Error(ERR_NETWORK_CLIENT, "new client %d connected", new_client_nr);
373 for (player = &first_player; player; player = player->next)
375 if (player->nr == new_client_nr)
376 Error(ERR_EXIT, "multiplayer server sent duplicate player id");
378 last_player = player;
381 last_player->next = player =
382 checked_malloc(sizeof(struct NetworkClientPlayerInfo));
383 player->nr = new_client_nr;
384 player->name[0] = '\0';
387 stored_player[new_index_nr].connected_network = TRUE;
390 static void Handle_OP_PLAYER_DISCONNECTED()
392 struct NetworkClientPlayerInfo *player, *player_disconnected;
393 int player_nr = (int)buffer[0];
394 int index_nr = player_nr - 1;
396 printf("OP_PLAYER_DISCONNECTED: %d\n", player_nr);
397 player_disconnected = getNetworkPlayer(player_nr);
398 Error(ERR_NETWORK_CLIENT, "client %d (%s) disconnected",
399 player_nr, getNetworkPlayerName(buffer[0]));
401 for (player = &first_player; player; player = player->next)
402 if (player->next == player_disconnected)
403 player->next = player_disconnected->next;
404 free(player_disconnected);
406 stored_player[index_nr].connected_locally = FALSE;
407 stored_player[index_nr].connected_network = FALSE;
410 static void Handle_OP_START_PLAYING()
412 LevelDirTree *new_leveldir;
414 unsigned int new_random_seed;
415 char *new_leveldir_identifier;
417 new_level_nr = (buffer[2] << 8) + buffer[3];
419 (buffer[6] << 24) | (buffer[7] << 16) | (buffer[8] << 8) | (buffer[9]);
420 new_leveldir_identifier = (char *)&buffer[10];
422 new_leveldir = getTreeInfoFromIdentifier(leveldir_first,
423 new_leveldir_identifier);
424 if (new_leveldir == NULL)
426 Error(ERR_WARN, "no such level identifier: '%s'", new_leveldir_identifier);
428 new_leveldir = leveldir_first;
429 Error(ERR_WARN, "using default level set: '%s'", new_leveldir->identifier);
432 printf("OP_START_PLAYING: %d\n", buffer[0]);
433 Error(ERR_NETWORK_CLIENT,
434 "client %d starts game [level %d from level identifier '%s']\n",
435 buffer[0], new_level_nr, new_leveldir->identifier);
437 leveldir_current = new_leveldir;
438 level_nr = new_level_nr;
444 StartGameActions(FALSE, setup.autorecord, new_random_seed);
447 static void Handle_OP_PAUSE_PLAYING()
449 printf("OP_PAUSE_PLAYING: %d\n", buffer[0]);
450 Error(ERR_NETWORK_CLIENT, "client %d pauses game", buffer[0]);
453 DrawVideoDisplay(VIDEO_STATE_PAUSE_ON,0);
456 static void Handle_OP_CONTINUE_PLAYING()
458 printf("OP_CONTINUE_PLAYING: %d\n", buffer[0]);
459 Error(ERR_NETWORK_CLIENT, "client %d continues game", buffer[0]);
461 tape.pausing = FALSE;
462 DrawVideoDisplay(VIDEO_STATE_PAUSE_OFF,0);
465 static void Handle_OP_STOP_PLAYING()
467 printf("OP_STOP_PLAYING: %d [%d]\n", buffer[0], buffer[2]);
468 Error(ERR_NETWORK_CLIENT, "client %d stops game [%d]", buffer[0], buffer[2]);
470 if (game_status == GAME_MODE_PLAYING)
472 if (buffer[2] == NETWORK_STOP_BY_PLAYER)
473 Request("Network game stopped by player!", REQ_CONFIRM);
474 else if (buffer[2] == NETWORK_STOP_BY_ERROR)
475 Request("Network game stopped due to internal error!", REQ_CONFIRM);
477 Request("Network game stopped!", REQ_CONFIRM);
480 SetGameStatus(GAME_MODE_MAIN);
485 static void Handle_OP_MOVE_PLAYER(unsigned int len)
487 int server_frame_counter;
490 if (!network_playing)
493 server_frame_counter =
494 (buffer[2] << 24) | (buffer[3] << 16) | (buffer[4] << 8) | (buffer[5]);
496 if (server_frame_counter != FrameCounter)
498 Error(ERR_INFO, "client and servers frame counters out of sync");
499 Error(ERR_INFO, "frame counter of client is %d", FrameCounter);
500 Error(ERR_INFO, "frame counter of server is %d", server_frame_counter);
501 Error(ERR_INFO, "this should not happen -- please debug");
503 stop_network_game = TRUE;
508 /* copy valid player actions */
509 for (i = 0; i < MAX_PLAYERS; i++)
510 stored_player[i].effective_action =
511 (i < len - 6 ? buffer[6 + i] : 0);
513 network_player_action_received = TRUE;
516 static void HandleNetworkingMessages()
518 unsigned int message_length;
520 stop_network_game = FALSE;
522 while (nread >= 4 && nread >= 4 + readbuffer[3])
524 message_length = readbuffer[3];
525 if (readbuffer[0] || readbuffer[1] || readbuffer[2])
526 Error(ERR_EXIT, "wrong network server line length");
528 memcpy(buffer, &readbuffer[4], message_length);
529 nread -= 4 + message_length;
530 memmove(readbuffer, readbuffer + 4 + message_length, nread);
534 case OP_BAD_PROTOCOL_VERSION:
535 Handle_OP_BAD_PROTOCOL_VERSION();
539 Handle_OP_YOUR_NUMBER();
542 case OP_NUMBER_WANTED:
543 Handle_OP_NUMBER_WANTED();
547 Handle_OP_PLAYER_NAME(message_length);
550 case OP_PLAYER_CONNECTED:
551 Handle_OP_PLAYER_CONNECTED();
554 case OP_PLAYER_DISCONNECTED:
555 Handle_OP_PLAYER_DISCONNECTED();
558 case OP_START_PLAYING:
559 Handle_OP_START_PLAYING();
562 case OP_PAUSE_PLAYING:
563 Handle_OP_PAUSE_PLAYING();
566 case OP_CONTINUE_PLAYING:
567 Handle_OP_CONTINUE_PLAYING();
570 case OP_STOP_PLAYING:
571 Handle_OP_STOP_PLAYING();
575 Handle_OP_MOVE_PLAYER(message_length);
578 case OP_BROADCAST_MESSAGE:
579 printf("OP_BROADCAST_MESSAGE: %d\n", buffer[0]);
580 Error(ERR_NETWORK_CLIENT, "client %d sends message", buffer[0]);
587 /* in case of internal error, stop network game */
588 if (stop_network_game)
589 SendToServer_StopPlaying(NETWORK_STOP_BY_ERROR);
594 void HandleNetworking()
600 if ((r = SDLNet_CheckSockets(rfds, 1)) < 0)
601 Error(ERR_EXIT, "HandleNetworking(): SDLNet_CheckSockets() failed");
605 r = SDLNet_TCP_Recv(sfd, readbuffer + nread, 1);
608 Error(ERR_EXIT, "error reading from network server");
611 Error(ERR_EXIT, "connection to network server lost");
615 HandleNetworkingMessages();
621 #endif /* NETWORK_AVALIABLE */