1 // ============================================================================
2 // Rocks'n'Diamonds - McDuffin Strikes Back!
3 // ----------------------------------------------------------------------------
4 // (c) 1995-2014 by Artsoft Entertainment
7 // http://www.artsoft.org/
8 // ----------------------------------------------------------------------------
10 // ============================================================================
15 #include "libgame/libgame.h"
26 struct NetworkClientPlayerInfo
29 char name[MAX_PLAYER_NAME_LEN + 1];
30 struct NetworkClientPlayerInfo *next;
33 static struct NetworkClientPlayerInfo first_player =
42 static TCPsocket sfd; /* TCP server socket */
43 static UDPsocket udp; /* UDP server socket */
44 static SDLNet_SocketSet rfds; /* socket set */
46 static byte realbuffer[512];
47 static byte readbuffer[MAX_BUFFER_SIZE], writbuffer[MAX_BUFFER_SIZE];
48 static byte *buffer = realbuffer + 4;
49 static int nread = 0, nwrite = 0;
50 static boolean stop_network_game = FALSE;
52 static void DrawNetworkTextExt(char *message, int font_nr, boolean initialize)
54 static int xpos = 0, ypos = 0;
55 static int max_line_width = 0;
56 int font_width = getFontWidth(font_nr);
57 int font_height = getFontHeight(font_nr);
63 if (game_status == GAME_MODE_LOADING)
65 max_line_width = WIN_XSIZE;
67 xpos = (max_line_width - getTextWidth(message, font_nr)) / 2;
70 DrawText(xpos, ypos, message, font_nr);
77 max_line_width = SXSIZE;
79 DrawTextSCentered(ypos_1, font_nr, message);
81 /* calculate offset to x position caused by rounding */
82 int max_chars_per_line = max_line_width / font_width;
83 int xoffset = (max_line_width - max_chars_per_line * font_width) / 2;
89 Error(ERR_DEBUG, "========== %s ==========", message);
93 int max_chars_per_line = max_line_width / font_width;
94 int max_lines_per_text = 10;
95 int num_lines_spacing = (font_nr == FC_YELLOW ? 1 : 3);
96 int num_lines_printed = DrawTextBuffer(xpos, ypos, message, font_nr,
97 max_chars_per_line, -1,
98 max_lines_per_text, 0, -1,
101 ypos += (num_lines_printed + num_lines_spacing) * font_height;
103 Error(ERR_DEBUG, "%s", message);
109 static void DrawNetworkText(char *message)
111 DrawNetworkTextExt(message, FC_YELLOW, FALSE);
114 static void DrawNetworkText_Success(char *message)
116 DrawNetworkTextExt(message, FC_GREEN, FALSE);
119 static void DrawNetworkText_Failed(char *message)
121 DrawNetworkTextExt(message, FC_RED, FALSE);
124 static void DrawNetworkText_Title(char *message)
126 DrawNetworkTextExt(message, FC_GREEN, TRUE);
129 static void SendBufferToServer(int size)
131 if (!network.enabled)
134 realbuffer[0] = realbuffer[1] = realbuffer[2] = 0;
135 realbuffer[3] = (byte)size;
138 if (nwrite + 4 + size >= MAX_BUFFER_SIZE)
139 Error(ERR_EXIT, "internal error: network send buffer overflow");
141 memcpy(writbuffer + nwrite, realbuffer, 4 + size);
144 /* directly send the buffer to the network server */
145 SDLNet_TCP_Send(sfd, writbuffer, nwrite);
149 struct NetworkClientPlayerInfo *getNetworkPlayer(int player_nr)
151 struct NetworkClientPlayerInfo *player = NULL;
153 for (player = &first_player; player; player = player->next)
154 if (player->nr == player_nr)
157 if (player == NULL) /* should not happen */
158 Error(ERR_EXIT, "protocol error: reference to non-existing player %d",
164 char *getNetworkPlayerName(int player_nr)
166 struct NetworkClientPlayerInfo *player;
169 return("the network game server");
170 else if (player_nr == first_player.nr)
173 for (player = &first_player; player; player = player->next)
174 if (player->nr == player_nr && strlen(player->name) > 0)
175 return(player->name);
177 return(EMPTY_PLAYER_NAME);
180 static void StartNetworkServer(int port)
185 #if defined(TARGET_SDL2)
186 server_thread = SDL_CreateThread(NetworkServerThread,
187 "NetworkServerThread", &p);
189 server_thread = SDL_CreateThread(NetworkServerThread, &p);
191 network_server = TRUE;
194 boolean ConnectToServer(char *hostname, int port)
200 DrawNetworkText_Title("Initializing Network");
203 port = DEFAULT_SERVER_PORT;
205 if (hostname == NULL)
207 // if no hostname given, try to auto-detect network server in local network
208 // by doing a UDP broadcast on the network server port and wait for answer
210 SDLNet_SocketSet udp_socket_set = SDLNet_AllocSocketSet(1);
212 Error(ERR_EXIT, "SDLNet_AllocSocketSet() failed: %s"), SDLNet_GetError();
214 udp = SDLNet_UDP_Open(0);
216 Error(ERR_EXIT, "SDLNet_UDP_Open() failed: %s", SDLNet_GetError());
218 if (SDLNet_UDP_AddSocket(udp_socket_set, udp) == -1)
219 Error(ERR_EXIT_NETWORK_SERVER, "SDLNet_TCP_AddSocket() failed: %s"),
222 char *data_ptr = "network server UDB broadcast";
223 int data_len = strlen(data_ptr) + 1;
224 IPaddress ip_address;
226 SDLNet_Write32(0xffffffff, &ip_address.host); /* 255.255.255.255 */
227 SDLNet_Write16(port, &ip_address.port);
239 SDLNet_UDP_Send(udp, -1, &packet);
241 DrawNetworkText("Looking for local network server ...");
243 if (SDLNet_CheckSockets(udp_socket_set, 500) == 1)
245 int num_packets = SDLNet_UDP_Recv(udp, &packet);
247 if (num_packets == 1)
249 DrawNetworkText_Success("Network server found!");
251 server_host = SDLNet_Read32(&packet.address.host);
255 DrawNetworkText_Failed("No answer from network server!");
260 DrawNetworkText_Failed("No network server found!");
264 rfds = SDLNet_AllocSocketSet(1);
268 SDLNet_ResolveHost(&ip, hostname, port);
270 if (ip.host == INADDR_NONE)
271 Error(ERR_EXIT, "cannot locate host '%s'", hostname);
273 server_host = SDLNet_Read32(&ip.host);
275 DrawNetworkText("Connecting to remote host ...");
279 // if no hostname was given and no network server was auto-detected in the
280 // local network, try to connect to a network server at the local host
281 if (server_host == 0)
282 server_host = 0x7f000001; /* 127.0.0.1 */
284 SDLNet_Write32(server_host, &ip.host);
285 SDLNet_Write16(port, &ip.port);
287 DrawNetworkText("Connecting to local host ...");
290 Error(ERR_DEBUG, "trying to connect to network server at %d.%d.%d.%d ...",
291 (server_host >> 24) & 0xff,
292 (server_host >> 16) & 0xff,
293 (server_host >> 8) & 0xff,
294 (server_host >> 0) & 0xff);
296 sfd = SDLNet_TCP_Open(&ip);
300 SDLNet_TCP_AddSocket(rfds, sfd);
302 DrawNetworkText_Success("Successfully connected!");
308 DrawNetworkText_Failed("Failed to connect to network server!");
310 printf("SDLNet_TCP_Open(): %s\n", SDLNet_GetError());
313 if (hostname) /* connect to specified server failed */
316 DrawNetworkText("Starting new local network server ...");
318 StartNetworkServer(port);
320 /* wait for server to start up and try connecting several times */
321 for (i = 0; i < 30; i++)
323 if ((sfd = SDLNet_TCP_Open(&ip))) /* connected */
325 DrawNetworkText_Success("Successfully connected!");
327 SDLNet_TCP_AddSocket(rfds, sfd);
334 DrawNetworkText_Failed("Failed to connect to network server!");
336 /* when reaching this point, connect to newly started server has failed */
340 void SendToServer_PlayerName(char *player_name)
342 int len_player_name = strlen(player_name);
344 buffer[1] = OP_PLAYER_NAME;
345 memcpy(&buffer[2], player_name, len_player_name);
346 SendBufferToServer(2 + len_player_name);
347 Error(ERR_NETWORK_CLIENT, "you set your player name to \"%s\"", player_name);
350 void SendToServer_ProtocolVersion()
352 buffer[1] = OP_PROTOCOL_VERSION;
353 buffer[2] = PROTOCOL_VERSION_1;
354 buffer[3] = PROTOCOL_VERSION_2;
355 buffer[4] = PROTOCOL_VERSION_3;
357 SendBufferToServer(5);
360 void SendToServer_NrWanted(int nr_wanted)
362 buffer[1] = OP_NUMBER_WANTED;
363 buffer[2] = nr_wanted;
365 SendBufferToServer(3);
368 void SendToServer_StartPlaying()
370 unsigned int new_random_seed = InitRND(level.random_seed);
372 int dummy = 0; /* !!! HAS NO MEANING ANYMORE !!! */
373 /* the name of the level must be enough */
375 buffer[1] = OP_START_PLAYING;
376 buffer[2] = (byte)(level_nr >> 8);
377 buffer[3] = (byte)(level_nr & 0xff);
378 buffer[4] = (byte)(dummy >> 8);
379 buffer[5] = (byte)(dummy & 0xff);
381 buffer[6] = (unsigned char)((new_random_seed >> 24) & 0xff);
382 buffer[7] = (unsigned char)((new_random_seed >> 16) & 0xff);
383 buffer[8] = (unsigned char)((new_random_seed >> 8) & 0xff);
384 buffer[9] = (unsigned char)((new_random_seed >> 0) & 0xff);
386 strcpy((char *)&buffer[10], leveldir_current->identifier);
388 SendBufferToServer(10 + strlen(leveldir_current->identifier) + 1);
391 void SendToServer_PausePlaying()
393 buffer[1] = OP_PAUSE_PLAYING;
395 SendBufferToServer(2);
398 void SendToServer_ContinuePlaying()
400 buffer[1] = OP_CONTINUE_PLAYING;
402 SendBufferToServer(2);
405 void SendToServer_StopPlaying(int cause_for_stopping)
407 buffer[1] = OP_STOP_PLAYING;
408 buffer[2] = cause_for_stopping;
410 SendBufferToServer(3);
413 void SendToServer_MovePlayer(byte player_action)
415 buffer[1] = OP_MOVE_PLAYER;
416 buffer[2] = player_action;
418 SendBufferToServer(3);
421 static void Handle_OP_BAD_PROTOCOL_VERSION()
423 Error(ERR_WARN, "protocol version mismatch");
424 Error(ERR_EXIT, "server expects %d.%d.x instead of %d.%d.%d",
425 buffer[2], buffer[3],
426 PROTOCOL_VERSION_1, PROTOCOL_VERSION_2, PROTOCOL_VERSION_3);
429 static void Handle_OP_YOUR_NUMBER()
431 int new_client_nr = buffer[2];
432 int new_index_nr = new_client_nr - 1;
433 struct PlayerInfo *old_local_player = local_player;
434 struct PlayerInfo *new_local_player = &stored_player[new_index_nr];
436 printf("OP_YOUR_NUMBER: %d\n", buffer[0]);
437 first_player.nr = new_client_nr;
439 if (old_local_player != new_local_player)
441 /* set relevant player settings and change to new player */
443 local_player = new_local_player;
445 old_local_player->connected_locally = FALSE;
446 new_local_player->connected_locally = TRUE;
448 old_local_player->connected_network = FALSE;
449 new_local_player->connected_network = TRUE;
452 if (first_player.nr > MAX_PLAYERS)
453 Error(ERR_EXIT, "sorry, more than %d players not allowed", MAX_PLAYERS);
455 Error(ERR_NETWORK_CLIENT, "you get client # %d", new_client_nr);
458 static void Handle_OP_NUMBER_WANTED()
460 int client_nr_wanted = buffer[2];
461 int old_client_nr = buffer[0];
462 int new_client_nr = buffer[3];
463 int old_index_nr = old_client_nr - 1;
464 int new_index_nr = new_client_nr - 1;
465 int index_nr_wanted = client_nr_wanted - 1;
466 struct PlayerInfo *old_player = &stored_player[old_index_nr];
467 struct PlayerInfo *new_player = &stored_player[new_index_nr];
469 printf("OP_NUMBER_WANTED: %d\n", buffer[0]);
471 if (new_client_nr == client_nr_wanted) /* switching succeeded */
473 struct NetworkClientPlayerInfo *player;
475 if (old_client_nr != client_nr_wanted) /* client's nr has changed */
476 Error(ERR_NETWORK_CLIENT, "client %d switches to # %d",
477 old_client_nr, new_client_nr);
478 else if (old_client_nr == first_player.nr) /* local player keeps his nr */
479 Error(ERR_NETWORK_CLIENT, "keeping client # %d", new_client_nr);
481 if (old_client_nr != new_client_nr)
483 /* set relevant player settings and change to new player */
485 old_player->connected_network = FALSE;
486 new_player->connected_network = TRUE;
489 player = getNetworkPlayer(old_client_nr);
490 player->nr = new_client_nr;
492 if (old_player == local_player) /* local player switched */
494 local_player = new_player;
496 old_player->connected_locally = FALSE;
497 new_player->connected_locally = TRUE;
500 else if (old_client_nr == first_player.nr) /* failed -- local player? */
504 sprintf(request, "Sorry! Player %d already exists! You are player %d!",
505 index_nr_wanted + 1, new_index_nr + 1);
507 Request(request, REQ_CONFIRM);
509 Error(ERR_NETWORK_CLIENT, "cannot switch -- you keep client # %d",
514 static void Handle_OP_PLAYER_NAME(unsigned int len)
516 struct NetworkClientPlayerInfo *player;
517 int player_nr = (int)buffer[0];
519 printf("OP_PLAYER_NAME: %d\n", player_nr);
520 player = getNetworkPlayer(player_nr);
522 Error(ERR_NETWORK_CLIENT, "client %d calls itself \"%s\"",
523 buffer[0], &buffer[2]);
524 strncpy(player->name, (char *)&buffer[2], MAX_PLAYER_NAME_LEN);
527 static void Handle_OP_PLAYER_CONNECTED()
529 struct NetworkClientPlayerInfo *player, *last_player = NULL;
530 int new_client_nr = (int)buffer[0];
531 int new_index_nr = new_client_nr - 1;
533 printf("OP_PLAYER_CONNECTED: %d\n", new_client_nr);
534 Error(ERR_NETWORK_CLIENT, "new client %d connected", new_client_nr);
536 for (player = &first_player; player; player = player->next)
538 if (player->nr == new_client_nr)
539 Error(ERR_EXIT, "multiplayer server sent duplicate player id");
541 last_player = player;
544 last_player->next = player =
545 checked_malloc(sizeof(struct NetworkClientPlayerInfo));
546 player->nr = new_client_nr;
547 player->name[0] = '\0';
550 stored_player[new_index_nr].connected_network = TRUE;
553 static void Handle_OP_PLAYER_DISCONNECTED()
555 struct NetworkClientPlayerInfo *player, *player_disconnected;
556 int player_nr = (int)buffer[0];
557 int index_nr = player_nr - 1;
559 printf("OP_PLAYER_DISCONNECTED: %d\n", player_nr);
560 player_disconnected = getNetworkPlayer(player_nr);
561 Error(ERR_NETWORK_CLIENT, "client %d (%s) disconnected",
562 player_nr, getNetworkPlayerName(buffer[0]));
564 for (player = &first_player; player; player = player->next)
565 if (player->next == player_disconnected)
566 player->next = player_disconnected->next;
567 free(player_disconnected);
569 stored_player[index_nr].connected_locally = FALSE;
570 stored_player[index_nr].connected_network = FALSE;
573 static void Handle_OP_START_PLAYING()
575 LevelDirTree *new_leveldir;
577 unsigned int new_random_seed;
578 char *new_leveldir_identifier;
580 new_level_nr = (buffer[2] << 8) + buffer[3];
582 (buffer[6] << 24) | (buffer[7] << 16) | (buffer[8] << 8) | (buffer[9]);
583 new_leveldir_identifier = (char *)&buffer[10];
585 new_leveldir = getTreeInfoFromIdentifier(leveldir_first,
586 new_leveldir_identifier);
587 if (new_leveldir == NULL)
589 Error(ERR_WARN, "no such level identifier: '%s'", new_leveldir_identifier);
591 new_leveldir = leveldir_first;
592 Error(ERR_WARN, "using default level set: '%s'", new_leveldir->identifier);
595 printf("OP_START_PLAYING: %d\n", buffer[0]);
596 Error(ERR_NETWORK_CLIENT,
597 "client %d starts game [level %d from level identifier '%s']\n",
598 buffer[0], new_level_nr, new_leveldir->identifier);
600 leveldir_current = new_leveldir;
601 level_nr = new_level_nr;
607 StartGameActions(FALSE, setup.autorecord, new_random_seed);
610 static void Handle_OP_PAUSE_PLAYING()
612 printf("OP_PAUSE_PLAYING: %d\n", buffer[0]);
613 Error(ERR_NETWORK_CLIENT, "client %d pauses game", buffer[0]);
616 DrawVideoDisplay(VIDEO_STATE_PAUSE_ON,0);
619 static void Handle_OP_CONTINUE_PLAYING()
621 printf("OP_CONTINUE_PLAYING: %d\n", buffer[0]);
622 Error(ERR_NETWORK_CLIENT, "client %d continues game", buffer[0]);
624 tape.pausing = FALSE;
625 DrawVideoDisplay(VIDEO_STATE_PAUSE_OFF,0);
628 static void Handle_OP_STOP_PLAYING()
630 printf("OP_STOP_PLAYING: %d [%d]\n", buffer[0], buffer[2]);
631 Error(ERR_NETWORK_CLIENT, "client %d stops game [%d]", buffer[0], buffer[2]);
633 if (game_status == GAME_MODE_PLAYING)
635 int client_nr = buffer[0];
636 int index_nr = client_nr - 1;
637 struct PlayerInfo *client_player = &stored_player[index_nr];
638 boolean stopped_by_remote_player = (!client_player->connected_locally);
639 char *message = (buffer[2] == NETWORK_STOP_BY_PLAYER ?
640 "Network game stopped by player!" :
641 buffer[2] == NETWORK_STOP_BY_ERROR ?
642 "Network game stopped due to internal error!" :
643 "Network game stopped!");
645 if (buffer[2] != NETWORK_STOP_BY_PLAYER || stopped_by_remote_player)
646 Request(message, REQ_CONFIRM | REQ_STAY_CLOSED);
649 SetGameStatus(GAME_MODE_MAIN);
654 static void Handle_OP_MOVE_PLAYER(unsigned int len)
656 int server_frame_counter;
659 if (!network_playing)
662 server_frame_counter =
663 (buffer[2] << 24) | (buffer[3] << 16) | (buffer[4] << 8) | (buffer[5]);
665 if (server_frame_counter != FrameCounter)
667 Error(ERR_INFO, "client and servers frame counters out of sync");
668 Error(ERR_INFO, "frame counter of client is %d", FrameCounter);
669 Error(ERR_INFO, "frame counter of server is %d", server_frame_counter);
670 Error(ERR_INFO, "this should not happen -- please debug");
672 stop_network_game = TRUE;
677 /* copy valid player actions */
678 for (i = 0; i < MAX_PLAYERS; i++)
679 stored_player[i].effective_action =
680 (i < len - 6 ? buffer[6 + i] : 0);
682 network_player_action_received = TRUE;
685 static void HandleNetworkingMessages()
687 unsigned int message_length;
689 stop_network_game = FALSE;
691 while (nread >= 4 && nread >= 4 + readbuffer[3])
693 message_length = readbuffer[3];
694 if (readbuffer[0] || readbuffer[1] || readbuffer[2])
695 Error(ERR_EXIT, "wrong network server line length");
697 memcpy(buffer, &readbuffer[4], message_length);
698 nread -= 4 + message_length;
699 memmove(readbuffer, readbuffer + 4 + message_length, nread);
703 case OP_BAD_PROTOCOL_VERSION:
704 Handle_OP_BAD_PROTOCOL_VERSION();
708 Handle_OP_YOUR_NUMBER();
711 case OP_NUMBER_WANTED:
712 Handle_OP_NUMBER_WANTED();
716 Handle_OP_PLAYER_NAME(message_length);
719 case OP_PLAYER_CONNECTED:
720 Handle_OP_PLAYER_CONNECTED();
723 case OP_PLAYER_DISCONNECTED:
724 Handle_OP_PLAYER_DISCONNECTED();
727 case OP_START_PLAYING:
728 Handle_OP_START_PLAYING();
731 case OP_PAUSE_PLAYING:
732 Handle_OP_PAUSE_PLAYING();
735 case OP_CONTINUE_PLAYING:
736 Handle_OP_CONTINUE_PLAYING();
739 case OP_STOP_PLAYING:
740 Handle_OP_STOP_PLAYING();
744 Handle_OP_MOVE_PLAYER(message_length);
747 case OP_BROADCAST_MESSAGE:
748 printf("OP_BROADCAST_MESSAGE: %d\n", buffer[0]);
749 Error(ERR_NETWORK_CLIENT, "client %d sends message", buffer[0]);
756 /* in case of internal error, stop network game */
757 if (stop_network_game)
758 SendToServer_StopPlaying(NETWORK_STOP_BY_ERROR);
761 static char *HandleNetworkingPackets()
765 /* ---------- check network server for activity ---------- */
767 int num_active_sockets = SDLNet_CheckSockets(rfds, 1);
769 if (num_active_sockets < 0)
770 return "Error checking network sockets!";
772 if (num_active_sockets == 0)
773 break; // no active sockets, stop here
775 /* ---------- read packets from network server ---------- */
777 int num_bytes = SDLNet_TCP_Recv(sfd, readbuffer + nread, 1);
780 return "Error reading from network server!";
783 return "Connection to network server lost!";
787 HandleNetworkingMessages();
793 static void HandleNetworkingDisconnect()
797 SDLNet_TCP_DelSocket(rfds, sfd);
798 SDLNet_TCP_Close(sfd);
800 network_playing = FALSE;
802 network.enabled = FALSE;
803 network.connected = FALSE;
805 setup.network_mode = FALSE;
807 for (i = 0; i < MAX_PLAYERS; i++)
808 stored_player[i].connected_network = FALSE;
811 void HandleNetworking()
813 char *error_message = HandleNetworkingPackets();
815 if (error_message != NULL)
817 HandleNetworkingDisconnect();
819 if (game_status == GAME_MODE_PLAYING)
821 Request(error_message, REQ_CONFIRM | REQ_STAY_CLOSED);
823 SetGameStatus(GAME_MODE_MAIN);
829 Request(error_message, REQ_CONFIRM);
834 void DisconnectFromNetworkServer()
836 DrawNetworkText_Title("Terminating Network");
837 DrawNetworkText("Disconnecting from network server ...");
839 HandleNetworkingDisconnect();
841 DrawNetworkText_Success("Successfully disconnected!");
843 /* short time to recognize result of network initialization */