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)
19 #if defined(TARGET_SDL)
23 #include <sys/socket.h>
24 #include <netinet/in.h>
25 #include <netinet/tcp.h>
26 #include <arpa/inet.h>
30 #include "libgame/libgame.h"
40 struct NetworkClientPlayerInfo
43 char name[MAX_PLAYER_NAME_LEN + 1];
44 struct NetworkClientPlayerInfo *next;
47 static struct NetworkClientPlayerInfo first_player =
56 #if defined(TARGET_SDL)
57 static TCPsocket sfd; /* server socket */
58 static SDLNet_SocketSet rfds; /* socket set */
60 static int sfd; /* server socket */
63 static byte realbuffer[512];
64 static byte readbuffer[MAX_BUFFER_SIZE], writbuffer[MAX_BUFFER_SIZE];
65 static byte *buffer = realbuffer + 4;
66 static int nread = 0, nwrite = 0;
67 static boolean stop_network_game = FALSE;
69 static void SendBufferToServer(int size)
74 realbuffer[0] = realbuffer[1] = realbuffer[2] = 0;
75 realbuffer[3] = (byte)size;
78 if (nwrite + 4 + size >= MAX_BUFFER_SIZE)
79 Error(ERR_EXIT, "internal error: network send buffer overflow");
81 memcpy(writbuffer + nwrite, realbuffer, 4 + size);
84 /* directly send the buffer to the network server */
85 #if defined(TARGET_SDL)
86 SDLNet_TCP_Send(sfd, writbuffer, nwrite);
88 if (write(sfd, writbuffer, nwrite) == -1)
89 Error(ERR_WARN, "write() failed; %s", strerror(errno));
94 struct NetworkClientPlayerInfo *getNetworkPlayer(int player_nr)
96 struct NetworkClientPlayerInfo *player = NULL;
98 for (player = &first_player; player; player = player->next)
99 if (player->nr == player_nr)
102 if (player == NULL) /* should not happen */
103 Error(ERR_EXIT, "protocol error: reference to non-existing player %d",
109 char *getNetworkPlayerName(int player_nr)
111 struct NetworkClientPlayerInfo *player;
114 return("the network game server");
115 else if (player_nr == first_player.nr)
118 for (player = &first_player; player; player = player->next)
119 if (player->nr == player_nr && player->name && strlen(player->name))
120 return(player->name);
122 return(EMPTY_PLAYER_NAME);
125 static void StartNetworkServer(int port)
127 #if defined(TARGET_SDL)
131 #if defined(TARGET_SDL2)
132 server_thread = SDL_CreateThread(NetworkServerThread,
133 "NetworkServerThread", &p);
135 server_thread = SDL_CreateThread(NetworkServerThread, &p);
137 network_server = TRUE;
144 NetworkServer(port, options.serveronly);
151 "cannot create network server process - no network playing");
152 options.network = FALSE;
156 /* we are parent process -- resume normal operation */
162 #if defined(TARGET_SDL)
163 boolean ConnectToServer(char *hostname, int port)
169 port = DEFAULT_SERVER_PORT;
171 rfds = SDLNet_AllocSocketSet(1);
175 SDLNet_ResolveHost(&ip, hostname, port);
176 if (ip.host == INADDR_NONE)
177 Error(ERR_EXIT, "cannot locate host '%s'", hostname);
181 SDLNet_Write32(0x7f000001, &ip.host); /* 127.0.0.1 */
182 SDLNet_Write16(port, &ip.port);
185 sfd = SDLNet_TCP_Open(&ip);
189 SDLNet_TCP_AddSocket(rfds, sfd);
194 printf("SDLNet_TCP_Open(): %s\n", SDLNet_GetError());
197 if (hostname) /* connect to specified server failed */
200 printf("No rocksndiamonds server on localhost -- starting up one ...\n");
201 StartNetworkServer(port);
203 /* wait for server to start up and try connecting several times */
204 for (i = 0; i < 6; i++)
206 Delay(500); /* wait 500 ms == 0.5 seconds */
208 if ((sfd = SDLNet_TCP_Open(&ip))) /* connected */
210 SDLNet_TCP_AddSocket(rfds, sfd);
215 /* when reaching this point, connect to newly started server has failed */
221 boolean ConnectToServer(char *hostname, int port)
223 struct sockaddr_in s;
224 struct protoent *tcpproto;
229 if ((s.sin_addr.s_addr = inet_addr(hostname)) == -1)
231 struct hostent *host;
233 if ((host = gethostbyname(hostname)) == NULL)
234 Error(ERR_EXIT, "cannot locate host '%s'", hostname);
236 s.sin_addr = *(struct in_addr *)(host->h_addr_list[0]);
240 s.sin_addr.s_addr = inet_addr("127.0.0.1"); /* localhost */
243 port = DEFAULT_SERVER_PORT;
245 s.sin_port = htons(port);
246 s.sin_family = AF_INET;
248 sfd = socket(PF_INET, SOCK_STREAM, 0);
250 Error(ERR_EXIT, "out of file descriptors");
252 if ((tcpproto = getprotobyname("tcp")) != NULL)
253 setsockopt(sfd, tcpproto->p_proto, TCP_NODELAY, (char *)&on, sizeof(int));
255 if (connect(sfd, (struct sockaddr *)&s, sizeof(s)) == 0) /* connected */
258 if (hostname) /* connect to specified server failed */
261 printf("No rocksndiamonds server on localhost -- starting up one ...\n");
262 StartNetworkServer(port);
264 /* wait for server to start up and try connecting several times */
265 for (i = 0; i < 6; i++)
267 Delay(500); /* wait 500 ms == 0.5 seconds */
270 sfd = socket(PF_INET, SOCK_STREAM, 0);
272 Error(ERR_EXIT, "out of file descriptors");
274 setsockopt(sfd, tcpproto->p_proto, TCP_NODELAY, (char *)&on, sizeof(int));
276 if (connect(sfd, (struct sockaddr *)&s, sizeof(s)) >= 0) /* connected */
280 /* when reaching this point, connect to newly started server has failed */
283 #endif /* defined(TARGET_SDL) */
285 void SendToServer_PlayerName(char *player_name)
287 int len_player_name = strlen(player_name);
289 buffer[1] = OP_PLAYER_NAME;
290 memcpy(&buffer[2], player_name, len_player_name);
291 SendBufferToServer(2 + len_player_name);
292 Error(ERR_NETWORK_CLIENT, "you set your player name to \"%s\"", player_name);
295 void SendToServer_ProtocolVersion()
297 buffer[1] = OP_PROTOCOL_VERSION;
298 buffer[2] = PROTOCOL_VERSION_1;
299 buffer[3] = PROTOCOL_VERSION_2;
300 buffer[4] = PROTOCOL_VERSION_3;
302 SendBufferToServer(5);
305 void SendToServer_NrWanted(int nr_wanted)
307 buffer[1] = OP_NUMBER_WANTED;
308 buffer[2] = nr_wanted;
310 SendBufferToServer(3);
313 void SendToServer_StartPlaying()
315 unsigned int new_random_seed = InitRND(level.random_seed);
317 int dummy = 0; /* !!! HAS NO MEANING ANYMORE !!! */
318 /* the name of the level must be enough */
320 buffer[1] = OP_START_PLAYING;
321 buffer[2] = (byte)(level_nr >> 8);
322 buffer[3] = (byte)(level_nr & 0xff);
323 buffer[4] = (byte)(dummy >> 8);
324 buffer[5] = (byte)(dummy & 0xff);
326 buffer[6] = (unsigned char)((new_random_seed >> 24) & 0xff);
327 buffer[7] = (unsigned char)((new_random_seed >> 16) & 0xff);
328 buffer[8] = (unsigned char)((new_random_seed >> 8) & 0xff);
329 buffer[9] = (unsigned char)((new_random_seed >> 0) & 0xff);
331 strcpy((char *)&buffer[10], leveldir_current->identifier);
333 SendBufferToServer(10 + strlen(leveldir_current->identifier) + 1);
336 void SendToServer_PausePlaying()
338 buffer[1] = OP_PAUSE_PLAYING;
340 SendBufferToServer(2);
343 void SendToServer_ContinuePlaying()
345 buffer[1] = OP_CONTINUE_PLAYING;
347 SendBufferToServer(2);
350 void SendToServer_StopPlaying(int cause_for_stopping)
352 buffer[1] = OP_STOP_PLAYING;
353 buffer[2] = cause_for_stopping;
355 SendBufferToServer(3);
358 void SendToServer_MovePlayer(byte player_action)
360 buffer[1] = OP_MOVE_PLAYER;
361 buffer[2] = player_action;
363 SendBufferToServer(3);
366 static void Handle_OP_BAD_PROTOCOL_VERSION()
368 Error(ERR_WARN, "protocol version mismatch");
369 Error(ERR_EXIT, "server expects %d.%d.x instead of %d.%d.%d",
370 buffer[2], buffer[3],
371 PROTOCOL_VERSION_1, PROTOCOL_VERSION_2, PROTOCOL_VERSION_3);
374 static void Handle_OP_YOUR_NUMBER()
376 int new_client_nr = buffer[2];
377 int new_index_nr = new_client_nr - 1;
378 struct PlayerInfo *old_local_player = local_player;
379 struct PlayerInfo *new_local_player = &stored_player[new_index_nr];
381 printf("OP_YOUR_NUMBER: %d\n", buffer[0]);
382 first_player.nr = new_client_nr;
384 if (old_local_player != new_local_player)
386 /* copy existing player settings and change to new player */
388 *new_local_player = *old_local_player;
389 old_local_player->connected = FALSE;
390 local_player = new_local_player;
393 if (first_player.nr > MAX_PLAYERS)
394 Error(ERR_EXIT, "sorry, more than %d players not allowed", MAX_PLAYERS);
396 Error(ERR_NETWORK_CLIENT, "you get client # %d", new_client_nr);
399 static void Handle_OP_NUMBER_WANTED()
401 int client_nr_wanted = buffer[2];
402 int old_client_nr = buffer[0];
403 int new_client_nr = buffer[3];
404 int old_index_nr = old_client_nr - 1;
405 int new_index_nr = new_client_nr - 1;
406 int index_nr_wanted = client_nr_wanted - 1;
407 struct PlayerInfo *old_player = &stored_player[old_index_nr];
408 struct PlayerInfo *new_player = &stored_player[new_index_nr];
410 printf("OP_NUMBER_WANTED: %d\n", buffer[0]);
412 if (new_client_nr == client_nr_wanted) /* switching succeeded */
414 struct NetworkClientPlayerInfo *player;
416 if (old_client_nr != client_nr_wanted) /* client's nr has changed */
417 Error(ERR_NETWORK_CLIENT, "client %d switches to # %d",
418 old_client_nr, new_client_nr);
419 else if (old_client_nr == first_player.nr) /* local player keeps his nr */
420 Error(ERR_NETWORK_CLIENT, "keeping client # %d", new_client_nr);
422 if (old_client_nr != new_client_nr)
424 /* copy existing player settings and change to new player */
426 *new_player = *old_player;
427 old_player->connected = FALSE;
430 player = getNetworkPlayer(old_client_nr);
431 player->nr = new_client_nr;
433 if (old_player == local_player) /* local player switched */
434 local_player = new_player;
436 else if (old_client_nr == first_player.nr) /* failed -- local player? */
440 sprintf(request, "Sorry! Player %d already exists! You are player %d!",
441 index_nr_wanted + 1, new_index_nr + 1);
443 Request(request, REQ_CONFIRM);
445 Error(ERR_NETWORK_CLIENT, "cannot switch -- you keep client # %d",
450 static void Handle_OP_PLAYER_NAME(unsigned int len)
452 struct NetworkClientPlayerInfo *player;
453 int player_nr = (int)buffer[0];
455 printf("OP_PLAYER_NAME: %d\n", player_nr);
456 player = getNetworkPlayer(player_nr);
458 Error(ERR_NETWORK_CLIENT, "client %d calls itself \"%s\"",
459 buffer[0], &buffer[2]);
460 strncpy(player->name, (char *)&buffer[2], MAX_PLAYER_NAME_LEN);
463 static void Handle_OP_PLAYER_CONNECTED()
465 struct NetworkClientPlayerInfo *player, *last_player = NULL;
466 int new_client_nr = (int)buffer[0];
467 int new_index_nr = new_client_nr - 1;
469 printf("OP_PLAYER_CONNECTED: %d\n", new_client_nr);
470 Error(ERR_NETWORK_CLIENT, "new client %d connected", new_client_nr);
472 for (player = &first_player; player; player = player->next)
474 if (player->nr == new_client_nr)
475 Error(ERR_EXIT, "multiplayer server sent duplicate player id");
477 last_player = player;
480 last_player->next = player =
481 checked_malloc(sizeof(struct NetworkClientPlayerInfo));
482 player->nr = new_client_nr;
483 player->name[0] = '\0';
486 stored_player[new_index_nr].connected = TRUE;
489 static void Handle_OP_PLAYER_DISCONNECTED()
491 struct NetworkClientPlayerInfo *player, *player_disconnected;
492 int player_nr = (int)buffer[0];
494 printf("OP_PLAYER_DISCONNECTED: %d\n", player_nr);
495 player_disconnected = getNetworkPlayer(player_nr);
496 Error(ERR_NETWORK_CLIENT, "client %d (%s) disconnected",
497 player_nr, getNetworkPlayerName(buffer[0]));
499 for (player = &first_player; player; player = player->next)
500 if (player->next == player_disconnected)
501 player->next = player_disconnected->next;
502 free(player_disconnected);
505 static void Handle_OP_START_PLAYING()
507 LevelDirTree *new_leveldir;
509 unsigned int new_random_seed;
510 char *new_leveldir_identifier;
512 new_level_nr = (buffer[2] << 8) + buffer[3];
514 (buffer[6] << 24) | (buffer[7] << 16) | (buffer[8] << 8) | (buffer[9]);
515 new_leveldir_identifier = (char *)&buffer[10];
517 new_leveldir = getTreeInfoFromIdentifier(leveldir_first,
518 new_leveldir_identifier);
519 if (new_leveldir == NULL)
521 Error(ERR_WARN, "no such level identifier: '%s'", new_leveldir_identifier);
523 new_leveldir = leveldir_first;
524 Error(ERR_WARN, "using default level set: '%s'", new_leveldir->identifier);
527 printf("OP_START_PLAYING: %d\n", buffer[0]);
528 Error(ERR_NETWORK_CLIENT,
529 "client %d starts game [level %d from level identifier '%s']\n",
530 buffer[0], new_level_nr, new_leveldir->identifier);
532 leveldir_current = new_leveldir;
533 level_nr = new_level_nr;
539 StartGameActions(FALSE, setup.autorecord, new_random_seed);
542 static void Handle_OP_PAUSE_PLAYING()
544 printf("OP_PAUSE_PLAYING: %d\n", buffer[0]);
545 Error(ERR_NETWORK_CLIENT, "client %d pauses game", buffer[0]);
548 DrawVideoDisplay(VIDEO_STATE_PAUSE_ON,0);
551 static void Handle_OP_CONTINUE_PLAYING()
553 printf("OP_CONTINUE_PLAYING: %d\n", buffer[0]);
554 Error(ERR_NETWORK_CLIENT, "client %d continues game", buffer[0]);
556 tape.pausing = FALSE;
557 DrawVideoDisplay(VIDEO_STATE_PAUSE_OFF,0);
560 static void Handle_OP_STOP_PLAYING()
562 printf("OP_STOP_PLAYING: %d [%d]\n", buffer[0], buffer[2]);
563 Error(ERR_NETWORK_CLIENT, "client %d stops game [%d]", buffer[0], buffer[2]);
565 if (game_status == GAME_MODE_PLAYING)
567 if (buffer[2] == NETWORK_STOP_BY_PLAYER)
568 Request("Network game stopped by player!", REQ_CONFIRM);
569 else if (buffer[2] == NETWORK_STOP_BY_ERROR)
570 Request("Network game stopped due to internal error!", REQ_CONFIRM);
572 Request("Network game stopped!", REQ_CONFIRM);
575 game_status = GAME_MODE_MAIN;
579 static void Handle_OP_MOVE_PLAYER(unsigned int len)
581 int server_frame_counter;
584 if (!network_playing)
587 server_frame_counter =
588 (buffer[2] << 24) | (buffer[3] << 16) | (buffer[4] << 8) | (buffer[5]);
591 Error(ERR_NETWORK_CLIENT, "receiving server frame counter value %d [%d]",
592 server_frame_counter, FrameCounter);
595 if (server_frame_counter != FrameCounter)
597 Error(ERR_INFO, "client and servers frame counters out of sync");
598 Error(ERR_INFO, "frame counter of client is %d", FrameCounter);
599 Error(ERR_INFO, "frame counter of server is %d", server_frame_counter);
600 Error(ERR_INFO, "this should not happen -- please debug");
602 stop_network_game = TRUE;
607 /* copy valid player actions */
608 for (i = 0; i < MAX_PLAYERS; i++)
609 stored_player[i].effective_action =
610 (i < len - 6 && stored_player[i].active ? buffer[6 + i] : 0);
612 network_player_action_received = TRUE;
615 static void HandleNetworkingMessages()
617 unsigned int message_length;
619 stop_network_game = FALSE;
621 while (nread >= 4 && nread >= 4 + readbuffer[3])
623 message_length = readbuffer[3];
624 if (readbuffer[0] || readbuffer[1] || readbuffer[2])
625 Error(ERR_EXIT, "wrong network server line length");
627 memcpy(buffer, &readbuffer[4], message_length);
628 nread -= 4 + message_length;
629 memmove(readbuffer, readbuffer + 4 + message_length, nread);
633 case OP_BAD_PROTOCOL_VERSION:
634 Handle_OP_BAD_PROTOCOL_VERSION();
638 Handle_OP_YOUR_NUMBER();
641 case OP_NUMBER_WANTED:
642 Handle_OP_NUMBER_WANTED();
646 Handle_OP_PLAYER_NAME(message_length);
649 case OP_PLAYER_CONNECTED:
650 Handle_OP_PLAYER_CONNECTED();
653 case OP_PLAYER_DISCONNECTED:
654 Handle_OP_PLAYER_DISCONNECTED();
657 case OP_START_PLAYING:
658 Handle_OP_START_PLAYING();
661 case OP_PAUSE_PLAYING:
662 Handle_OP_PAUSE_PLAYING();
665 case OP_CONTINUE_PLAYING:
666 Handle_OP_CONTINUE_PLAYING();
669 case OP_STOP_PLAYING:
670 Handle_OP_STOP_PLAYING();
674 Handle_OP_MOVE_PLAYER(message_length);
677 case OP_BROADCAST_MESSAGE:
678 printf("OP_BROADCAST_MESSAGE: %d\n", buffer[0]);
679 Error(ERR_NETWORK_CLIENT, "client %d sends message", buffer[0]);
686 /* in case of internal error, stop network game */
687 if (stop_network_game)
688 SendToServer_StopPlaying(NETWORK_STOP_BY_ERROR);
693 void HandleNetworking()
695 #if !defined(TARGET_SDL)
696 static struct timeval tv = { 0, 0 };
703 #if defined(TARGET_SDL)
704 if ((r = SDLNet_CheckSockets(rfds, 1)) < 0)
705 Error(ERR_EXIT, "HandleNetworking(): SDLNet_CheckSockets() failed");
712 r = select(sfd + 1, &rfds, NULL, NULL, &tv);
714 if (r < 0 && errno != EINTR)
715 Error(ERR_EXIT, "HandleNetworking(): select() failed");
721 #if defined(TARGET_SDL)
724 if (FD_ISSET(sfd, &rfds))
727 #if defined(TARGET_SDL)
728 r = SDLNet_TCP_Recv(sfd, readbuffer + nread, 1);
730 r = read(sfd, readbuffer + nread, MAX_BUFFER_SIZE - nread);
734 Error(ERR_EXIT, "error reading from network server");
737 Error(ERR_EXIT, "connection to network server lost");
741 HandleNetworkingMessages();
747 #endif /* PLATFORM_UNIX */