1 // ============================================================================
2 // Rocks'n'Diamonds - McDuffin Strikes Back!
3 // ----------------------------------------------------------------------------
4 // (c) 1995-2014 by Artsoft Entertainment
7 // http://www.artsoft.org/
8 // ----------------------------------------------------------------------------
10 // ============================================================================
17 #include "libgame/libgame.h"
23 static int num_clients = 0;
24 static boolean run_server_only_once = FALSE;
26 struct NetworkServerPlayerInfo
29 char player_name[MAX_PLAYER_NAME_LEN + 1];
34 boolean action_received;
36 struct NetworkServerPlayerInfo *next;
39 static struct NetworkServerPlayerInfo *first_player = NULL;
41 #define NEXT(player) ((player)->next ? (player)->next : first_player)
43 /* TODO: peer address */
44 static TCPsocket lfd; /* listening TCP socket */
45 static UDPsocket udp; /* listening UDP socket */
46 static SDLNet_SocketSet fds; /* socket set */
48 static struct NetworkBuffer *read_buffer = NULL;
49 static struct NetworkBuffer *write_buffer = NULL;
51 static unsigned int ServerFrameCounter = 0;
54 int getNetwork8BitInteger(byte *ptr)
59 int putNetwork8BitInteger(byte *ptr, int value)
66 int getNetwork16BitInteger(byte *ptr)
68 return ((ptr[0] << 8) |
72 int putNetwork16BitInteger(byte *ptr, int value)
74 ptr[0] = (value >> 8) & 0xff;
75 ptr[1] = (value >> 0) & 0xff;
80 int getNetwork32BitInteger(byte *ptr)
82 return ((ptr[0] << 24) |
88 int putNetwork32BitInteger(byte *ptr, int value)
90 ptr[0] = (value >> 24) & 0xff;
91 ptr[1] = (value >> 16) & 0xff;
92 ptr[2] = (value >> 8) & 0xff;
93 ptr[3] = (value >> 0) & 0xff;
98 char *getNetworkString(byte *ptr)
103 int putNetworkString(byte *ptr, char *s)
105 strcpy((char *)ptr, s);
107 return strlen(s) + 1;
110 struct NetworkBuffer *newNetworkBuffer()
112 struct NetworkBuffer *new = checked_calloc(sizeof(struct NetworkBuffer));
114 new->max_size = MAX_BUFFER_SIZE;
118 new->buffer = checked_calloc(new->max_size);
123 static void resetNetworkBufferForReading(struct NetworkBuffer *nb)
128 static void resetNetworkBufferForWriting(struct NetworkBuffer *nb)
134 void initNetworkBufferForReceiving(struct NetworkBuffer *nb)
136 resetNetworkBufferForWriting(nb);
139 void initNetworkBufferForReading(struct NetworkBuffer *nb)
141 resetNetworkBufferForReading(nb);
143 /* skip message length header */
144 getNetworkBuffer32BitInteger(nb);
147 void initNetworkBufferForWriting(struct NetworkBuffer *nb, int message_type,
150 resetNetworkBufferForWriting(nb);
152 /* will be replaced with message length before sending */
153 putNetworkBuffer32BitInteger(nb, 0);
155 putNetworkBuffer8BitInteger(nb, message_type);
156 putNetworkBuffer8BitInteger(nb, player_nr);
159 static void copyNetworkBufferForWriting(struct NetworkBuffer *nb_from,
160 struct NetworkBuffer *nb_to,
163 initNetworkBufferForReading(nb_from);
165 int message_type = getNetworkBuffer8BitInteger(nb_from);
167 /* skip player number */
168 getNetworkBuffer8BitInteger(nb_from);
170 initNetworkBufferForWriting(nb_to, message_type, player_nr);
172 while (nb_from->pos < nb_from->size)
174 int b = getNetworkBuffer8BitInteger(nb_from);
176 putNetworkBuffer8BitInteger(nb_to, b);
180 static void increaseNetworkBuffer(struct NetworkBuffer *nb, int additional_size)
182 /* add some more buffer size than is really required this time */
183 nb->max_size += additional_size + MAX_BUFFER_SIZE;
184 nb->buffer = checked_realloc(nb->buffer, nb->max_size);
187 int receiveNetworkBufferBytes(struct NetworkBuffer *nb, TCPsocket socket,
190 if (nb->pos + num_bytes > nb->max_size)
191 increaseNetworkBuffer(nb, num_bytes);
193 int result = SDLNet_TCP_Recv(socket, &nb->buffer[nb->pos], num_bytes);
195 if (result != num_bytes)
198 nb->pos += num_bytes;
204 int receiveNetworkBufferPacket(struct NetworkBuffer *nb, TCPsocket socket)
206 int num_bytes, num_bytes_head, num_bytes_body;
209 num_bytes = receiveNetworkBufferBytes(nb, socket, num_bytes_head);
211 if (num_bytes != num_bytes_head)
214 num_bytes_body = getNetwork32BitInteger(nb->buffer);
215 num_bytes = receiveNetworkBufferBytes(nb, socket, num_bytes_body);
220 int getNetworkBuffer8BitInteger(struct NetworkBuffer *nb)
224 if (nb->pos + num_bytes > nb->size)
227 int value = getNetwork8BitInteger(&nb->buffer[nb->pos]);
229 nb->pos += num_bytes;
234 void putNetworkBuffer8BitInteger(struct NetworkBuffer *nb, int value)
238 if (nb->pos + num_bytes > nb->max_size)
239 increaseNetworkBuffer(nb, num_bytes);
241 nb->pos += putNetwork8BitInteger(&nb->buffer[nb->pos], value);
245 int getNetworkBuffer16BitInteger(struct NetworkBuffer *nb)
249 if (nb->pos + num_bytes > nb->size)
252 int value = getNetwork16BitInteger(&nb->buffer[nb->pos]);
254 nb->pos += num_bytes;
259 void putNetworkBuffer16BitInteger(struct NetworkBuffer *nb, int value)
263 if (nb->pos + num_bytes > nb->max_size)
264 increaseNetworkBuffer(nb, num_bytes);
266 nb->pos += putNetwork16BitInteger(&nb->buffer[nb->pos], value);
270 int getNetworkBuffer32BitInteger(struct NetworkBuffer *nb)
274 if (nb->pos + num_bytes > nb->size)
277 int value = getNetwork32BitInteger(&nb->buffer[nb->pos]);
279 nb->pos += num_bytes;
284 void putNetworkBuffer32BitInteger(struct NetworkBuffer *nb, int value)
288 if (nb->pos + num_bytes > nb->max_size)
289 increaseNetworkBuffer(nb, num_bytes);
291 nb->pos += putNetwork32BitInteger(&nb->buffer[nb->pos], value);
295 char *getNetworkBufferString(struct NetworkBuffer *nb)
297 char *s = getNetworkString(&nb->buffer[nb->pos]);
299 nb->pos += strlen(s) + 1;
304 void putNetworkBufferString(struct NetworkBuffer *nb, char *s)
306 int num_bytes = strlen(s) + 1;
308 if (nb->pos + num_bytes > nb->max_size)
309 increaseNetworkBuffer(nb, num_bytes);
311 nb->pos += putNetworkString(&nb->buffer[nb->pos], s);
315 static void SendNetworkBufferToAllButOne(struct NetworkBuffer *nb,
316 struct NetworkServerPlayerInfo *except)
318 struct NetworkServerPlayerInfo *player;
320 /* set message length header */
321 putNetwork32BitInteger(nb->buffer, nb->size - 4);
323 for (player = first_player; player != NULL; player = player->next)
325 if (player != except && player->introduced)
327 /* directly send the buffer to the network client */
328 SDLNet_TCP_Send(player->fd, nb->buffer, nb->size);
333 static void SendNetworkBufferToAll(struct NetworkBuffer *nb)
335 SendNetworkBufferToAllButOne(nb, NULL);
338 static void SendNetworkBufferToClient(struct NetworkBuffer *nb,
339 struct NetworkServerPlayerInfo *player)
341 /* set message length header */
342 putNetwork32BitInteger(nb->buffer, nb->size - 4);
344 /* directly send the buffer to the network client */
345 SDLNet_TCP_Send(player->fd, nb->buffer, nb->size);
348 static void RemovePlayer(struct NetworkServerPlayerInfo *player)
351 Error(ERR_NETWORK_SERVER, "dropping client %d (%s)",
352 player->number, player->player_name);
354 SDLNet_TCP_DelSocket(fds, player->fd);
355 SDLNet_TCP_Close(player->fd);
357 if (player == first_player)
359 first_player = player->next;
363 struct NetworkServerPlayerInfo *p;
365 for (p = first_player; p != NULL; p = p->next)
367 if (p->next && p->next == player)
369 p->next = player->next;
376 if (player->introduced)
378 initNetworkBufferForWriting(write_buffer, OP_PLAYER_DISCONNECTED,
381 SendNetworkBufferToAllButOne(write_buffer, player);
387 #if 0 /* do not terminate network server if last player disconnected */
388 if (run_server_only_once && num_clients == 0)
392 Error(ERR_NETWORK_SERVER, "no clients left");
393 Error(ERR_NETWORK_SERVER, "aborting");
401 static void AddPlayer(TCPsocket fd)
403 struct NetworkServerPlayerInfo *player, *p;
405 boolean again = TRUE;
407 SDLNet_TCP_AddSocket(fds, fd);
409 player = checked_calloc(sizeof(struct NetworkServerPlayerInfo));
412 player->player_name[0] = 0;
413 player->active = FALSE;
414 player->introduced = FALSE;
416 player->action_received = FALSE;
417 player->next = first_player;
419 first_player = player;
428 if (p->number == number)
441 player->number = number;
444 initNetworkBufferForWriting(write_buffer, OP_YOUR_NUMBER, 0);
446 putNetworkBuffer8BitInteger(write_buffer, player->number);
448 SendNetworkBufferToClient(write_buffer, player);
451 static void Handle_OP_PROTOCOL_VERSION(struct NetworkServerPlayerInfo *player)
453 int protocol_version_major = getNetworkBuffer8BitInteger(read_buffer);
454 int protocol_version_minor = getNetworkBuffer8BitInteger(read_buffer);
455 int protocol_version_patch = getNetworkBuffer8BitInteger(read_buffer);
457 if (protocol_version_major != PROTOCOL_VERSION_MAJOR ||
458 protocol_version_minor != PROTOCOL_VERSION_MINOR)
461 Error(ERR_NETWORK_SERVER,
462 "client %d (%s) has wrong protocol version %d.%d.%d",
463 player->number, player->player_name,
464 protocol_version_major,
465 protocol_version_minor,
466 protocol_version_patch);
468 initNetworkBufferForWriting(write_buffer, OP_BAD_PROTOCOL_VERSION, 0);
470 putNetworkBuffer8BitInteger(write_buffer, PROTOCOL_VERSION_MAJOR);
471 putNetworkBuffer8BitInteger(write_buffer, PROTOCOL_VERSION_MINOR);
472 putNetworkBuffer8BitInteger(write_buffer, PROTOCOL_VERSION_PATCH);
474 SendNetworkBufferToClient(write_buffer, player);
476 RemovePlayer(player);
481 Error(ERR_NETWORK_SERVER,
482 "client %d (%s) uses protocol version %d.%d.%d",
483 player->number, player->player_name,
484 protocol_version_major,
485 protocol_version_minor,
486 protocol_version_patch);
490 static void Handle_OP_NUMBER_WANTED(struct NetworkServerPlayerInfo *player)
492 int nr_wanted = getNetworkBuffer8BitInteger(read_buffer);
493 int client_nr = player->number;
494 boolean nr_is_free = TRUE;
495 struct NetworkServerPlayerInfo *p;
498 Error(ERR_NETWORK_SERVER, "client %d (%s) wants to switch to # %d",
499 player->number, player->player_name, nr_wanted);
501 for (p = first_player; p != NULL; p = p->next)
503 if (p->number == nr_wanted)
514 Error(ERR_NETWORK_SERVER, "client %d (%s) switches to # %d",
515 player->number, player->player_name, nr_wanted);
516 else if (player->number == nr_wanted)
517 Error(ERR_NETWORK_SERVER, "client %d (%s) already has # %d",
518 player->number, player->player_name, nr_wanted);
520 Error(ERR_NETWORK_SERVER,
521 "client %d (%s) cannot switch (client %d already exists)",
522 player->number, player->player_name, nr_wanted);
526 player->number = nr_wanted;
528 initNetworkBufferForWriting(write_buffer, OP_NUMBER_WANTED, client_nr);
530 putNetworkBuffer8BitInteger(write_buffer, nr_wanted);
531 putNetworkBuffer8BitInteger(write_buffer, player->number);
533 SendNetworkBufferToAll(write_buffer);
536 static void Handle_OP_PLAYER_NAME(struct NetworkServerPlayerInfo *player)
538 char *player_name = getNetworkBufferString(read_buffer);
541 strncpy(player->player_name, player_name, MAX_PLAYER_NAME_LEN);
542 player->player_name[MAX_PLAYER_NAME_LEN] = '\0';
544 for (i = 0; i < MAX_PLAYER_NAME_LEN; i++)
546 if (player->player_name[i] < ' ' ||
547 ((unsigned char)(player->player_name[i]) > 0x7e &&
548 (unsigned char)(player->player_name[i]) <= 0xa0))
550 player->player_name[i] = 0;
556 if (!player->introduced)
558 initNetworkBufferForWriting(write_buffer, OP_PLAYER_CONNECTED,
561 SendNetworkBufferToAllButOne(write_buffer, player);
565 Error(ERR_NETWORK_SERVER, "client %d calls itself \"%s\"",
566 player->number, player->player_name);
568 copyNetworkBufferForWriting(read_buffer, write_buffer, player->number);
570 SendNetworkBufferToAllButOne(write_buffer, player);
572 if (!player->introduced)
574 struct NetworkServerPlayerInfo *p;
576 for (p = first_player; p != NULL; p = p->next)
578 if (p != player && p->introduced)
580 initNetworkBufferForWriting(write_buffer, OP_PLAYER_CONNECTED,
583 SendNetworkBufferToClient(write_buffer, player);
585 initNetworkBufferForWriting(write_buffer, OP_PLAYER_NAME, p->number);
587 putNetworkBufferString(write_buffer, p->player_name);
589 SendNetworkBufferToClient(write_buffer, player);
594 player->introduced = TRUE;
597 static void Handle_OP_START_PLAYING(struct NetworkServerPlayerInfo *player)
599 char *new_leveldir_identifier = getNetworkBufferString(read_buffer);
600 int level_nr = getNetworkBuffer16BitInteger(read_buffer);
603 Error(ERR_NETWORK_SERVER,
604 "client %d (%s) starts game [level %d from level set '%s']",
605 player->number, player->player_name, level_nr,
606 new_leveldir_identifier);
608 struct NetworkServerPlayerInfo *p;
610 /* reset frame counter */
611 ServerFrameCounter = 0;
613 Error(ERR_NETWORK_SERVER, "resetting ServerFrameCounter to 0");
615 /* reset player actions */
616 for (p = first_player; p != NULL; p = p->next)
619 p->action_received = FALSE;
625 copyNetworkBufferForWriting(read_buffer, write_buffer, player->number);
627 SendNetworkBufferToAll(write_buffer);
630 static void Handle_OP_PAUSE_PLAYING(struct NetworkServerPlayerInfo *player)
633 Error(ERR_NETWORK_SERVER, "client %d (%s) pauses game",
634 player->number, player->player_name);
636 copyNetworkBufferForWriting(read_buffer, write_buffer, player->number);
638 SendNetworkBufferToAll(write_buffer);
641 static void Handle_OP_CONTINUE_PLAYING(struct NetworkServerPlayerInfo *player)
644 Error(ERR_NETWORK_SERVER, "client %d (%s) continues game",
645 player->number, player->player_name);
647 copyNetworkBufferForWriting(read_buffer, write_buffer, player->number);
649 SendNetworkBufferToAll(write_buffer);
652 static void Handle_OP_STOP_PLAYING(struct NetworkServerPlayerInfo *player)
654 int cause_for_stopping = getNetworkBuffer8BitInteger(read_buffer);
657 Error(ERR_NETWORK_SERVER, "client %d (%s) stops game [%d]",
658 player->number, player->player_name, cause_for_stopping);
660 copyNetworkBufferForWriting(read_buffer, write_buffer, player->number);
662 SendNetworkBufferToAll(write_buffer);
665 static void Handle_OP_MOVE_PLAYER(struct NetworkServerPlayerInfo *player)
667 int player_action = getNetworkBuffer8BitInteger(read_buffer);
668 int last_client_nr = 0;
669 struct NetworkServerPlayerInfo *p;
672 /* store player action */
673 for (p = first_player; p != NULL; p = p->next)
675 if (p->number == player->number)
677 p->action = player_action;
678 p->action_received = TRUE;
682 /* check if server received action from each player */
683 for (p = first_player; p != NULL; p = p->next)
685 if (!p->action_received)
688 if (p->number > last_client_nr)
689 last_client_nr = p->number;
692 int player_action_all[last_client_nr];
694 /* initialize all player actions to zero */
695 for (i = 0; i < last_client_nr; i++)
696 player_action_all[i] = 0;
698 /* broadcast actions of all players to all players */
699 for (p = first_player; p != NULL; p = p->next)
701 player_action_all[p->number - 1] = p->action;
704 p->action_received = FALSE;
707 initNetworkBufferForWriting(write_buffer, OP_MOVE_PLAYER, player->number);
709 putNetworkBuffer32BitInteger(write_buffer, ServerFrameCounter);
711 for (i = 0; i < last_client_nr; i++)
712 putNetworkBuffer8BitInteger(write_buffer, player_action_all[i]);
714 SendNetworkBufferToAll(write_buffer);
716 ServerFrameCounter++;
719 static void Handle_OP_BROADCAST_MESSAGE(struct NetworkServerPlayerInfo *player)
721 char *message = getNetworkBufferString(read_buffer);
724 Error(ERR_NETWORK_SERVER, "client %d (%s) sends message: %s",
725 player->number, player->player_name, message);
727 copyNetworkBufferForWriting(read_buffer, write_buffer, player->number);
729 SendNetworkBufferToAllButOne(write_buffer, player);
732 void ExitNetworkServer(int exit_value)
734 Error(ERR_NETWORK_SERVER, "exiting network server");
739 /* the following is not used for a standalone server;
740 the pointer points to an integer containing the port-number */
741 int NetworkServerThread(void *ptr)
743 NetworkServer(*((int *) ptr), 0);
745 /* should never be reached */
749 void NetworkServer(int port, int serveronly)
751 struct NetworkServerPlayerInfo *player;
754 #if defined(PLATFORM_UNIX) && !defined(PLATFORM_NEXT)
755 struct sigaction sact;
758 if (read_buffer == NULL)
759 read_buffer = newNetworkBuffer();
761 if (write_buffer == NULL)
762 write_buffer = newNetworkBuffer();
765 port = DEFAULT_SERVER_PORT;
767 // if only running the network server, exit on Ctrl-C
769 signal(SIGINT, ExitNetworkServer);
772 run_server_only_once = TRUE;
774 #if defined(PLATFORM_UNIX)
775 #if defined(PLATFORM_NEXT)
776 signal(SIGPIPE, SIG_IGN);
778 sact.sa_handler = SIG_IGN;
779 sigemptyset(&sact.sa_mask);
781 sigaction(SIGPIPE, &sact, NULL);
785 if (SDLNet_ResolveHost(&ip, NULL, port) == -1)
786 Error(ERR_EXIT_NETWORK_SERVER, "SDLNet_ResolveHost() failed: %s",
789 if ((fds = SDLNet_AllocSocketSet(MAX_PLAYERS + 1 + 1)) == NULL)
790 Error(ERR_EXIT_NETWORK_SERVER, "SDLNet_AllocSocketSet() failed: %s"),
793 if ((lfd = SDLNet_TCP_Open(&ip)) == NULL)
794 Error(ERR_EXIT_NETWORK_SERVER, "SDLNet_TCP_Open() failed: %s"),
797 if (SDLNet_TCP_AddSocket(fds, lfd) == -1)
798 Error(ERR_EXIT_NETWORK_SERVER, "SDLNet_TCP_AddSocket() failed: %s"),
801 if ((udp = SDLNet_UDP_Open(port)) == NULL)
802 Error(ERR_EXIT_NETWORK_SERVER, "SDLNet_UDP_Open() failed: %s",
805 if (SDLNet_UDP_AddSocket(fds, udp) == -1)
806 Error(ERR_EXIT_NETWORK_SERVER, "SDLNet_TCP_AddSocket() failed: %s"),
811 Error(ERR_NETWORK_SERVER, "started up, listening on port %d", port);
812 Error(ERR_NETWORK_SERVER, "using protocol version %d.%d.%d",
813 PROTOCOL_VERSION_MAJOR,
814 PROTOCOL_VERSION_MINOR,
815 PROTOCOL_VERSION_PATCH);
820 // wait for 100 ms for activity on open network sockets
821 if (SDLNet_CheckSockets(fds, 100) < 1)
824 /* accept incoming TCP connections */
825 if (SDLNet_SocketReady(lfd))
827 Error(ERR_DEBUG, "got TCP packet");
831 newsock = SDLNet_TCP_Accept(lfd);
837 /* accept incoming UDP packets */
838 if (SDLNet_SocketReady(udp))
840 Error(ERR_DEBUG, "got UDP packet");
842 static UDPpacket packet;
844 int num_packets = SDLNet_UDP_Recv(udp, &packet);
846 if (num_packets == 1)
849 SDLNet_UDP_Send(udp, -1, &packet);
853 for (player = first_player; player != NULL; player = player->next)
855 if (!SDLNet_SocketReady(player->fd))
858 initNetworkBufferForReceiving(read_buffer);
860 int num_bytes = receiveNetworkBufferPacket(read_buffer, player->fd);
865 Error(ERR_NETWORK_SERVER, "EOF from client %d (%s)",
866 player->number, player->player_name);
868 RemovePlayer(player);
873 initNetworkBufferForReading(read_buffer);
875 int message_type = getNetworkBuffer8BitInteger(read_buffer);
877 /* skip player number */
878 getNetworkBuffer8BitInteger(read_buffer);
880 if (!player->introduced &&
881 message_type != OP_PLAYER_NAME &&
882 message_type != OP_PROTOCOL_VERSION)
885 Error(ERR_NETWORK_SERVER, "got opcode %d for client %d which is not introduced yet (expected OP_PLAYER_NAME or OP_PROTOCOL_VERSION)", message_type, player->number);
887 RemovePlayer(player);
892 switch (message_type)
894 case OP_PROTOCOL_VERSION:
895 Handle_OP_PROTOCOL_VERSION(player);
898 case OP_NUMBER_WANTED:
899 Handle_OP_NUMBER_WANTED(player);
903 Handle_OP_PLAYER_NAME(player);
906 case OP_START_PLAYING:
907 Handle_OP_START_PLAYING(player);
910 case OP_PAUSE_PLAYING:
911 Handle_OP_PAUSE_PLAYING(player);
914 case OP_CONTINUE_PLAYING:
915 Handle_OP_CONTINUE_PLAYING(player);
918 case OP_STOP_PLAYING:
919 Handle_OP_STOP_PLAYING(player);
923 Handle_OP_MOVE_PLAYER(player);
926 case OP_BROADCAST_MESSAGE:
927 Handle_OP_BROADCAST_MESSAGE(player);
932 Error(ERR_NETWORK_SERVER,
933 "unknown opcode %d from client %d (%s)",
934 message_type, player->number, player->player_name);