1 /***********************************************************
2 * Rocks'n'Diamonds -- McDuffin Strikes Back! *
3 *----------------------------------------------------------*
4 * (c) 1995-98 Artsoft Entertainment *
8 * phone: ++49 +521 290471 *
9 * email: aeglos@valinor.owl.de *
10 *----------------------------------------------------------*
12 ***********************************************************/
20 #include <sys/socket.h>
21 #include <netinet/in.h>
22 #include <netinet/tcp.h>
23 #include <arpa/inet.h>
36 struct NetworkClientPlayerInfo
39 char name[MAX_PLAYER_NAME_LEN + 1];
40 struct NetworkClientPlayerInfo *next;
43 static struct NetworkClientPlayerInfo first_player =
53 static byte realbuffer[512];
54 static byte readbuffer[MAX_BUFFER_SIZE], writbuffer[MAX_BUFFER_SIZE];
55 static byte *buffer = realbuffer + 4;
56 static int nread = 0, nwrite = 0;
58 static void SendBufferToServer(int size)
63 realbuffer[0] = realbuffer[1] = realbuffer[2] = 0;
64 realbuffer[3] = (byte)size;
67 if (nwrite + 4 + size >= MAX_BUFFER_SIZE)
68 Error(ERR_EXIT, "internal error: network send buffer overflow");
70 memcpy(writbuffer + nwrite, realbuffer, 4 + size);
73 /* directly send the buffer to the network server */
74 write(sfd, writbuffer, nwrite);
78 struct NetworkClientPlayerInfo *getNetworkPlayer(int player_nr)
80 struct NetworkClientPlayerInfo *player = NULL;
82 for (player = &first_player; player; player = player->next)
83 if (player->nr == player_nr)
86 if (player == NULL) /* should not happen */
87 Error(ERR_EXIT, "protocol error: reference to non-existing player %d",
93 char *getNetworkPlayerName(int player_nr)
95 struct NetworkClientPlayerInfo *player;
98 return("the network game server");
99 else if (player_nr == first_player.nr)
102 for (player=&first_player; player; player=player->next)
103 if (player->nr == player_nr && player->name && strlen(player->name))
104 return(player->name);
106 return(EMPTY_PLAYER_NAME);
109 static void StartNetworkServer(int port)
114 NetworkServer(port, options.serveronly);
121 "cannot create network server process - no network playing");
122 options.network = FALSE;
126 /* we are parent process -- resume normal operation */
131 boolean ConnectToServer(char *hostname, int port)
133 struct sockaddr_in s;
134 struct protoent *tcpproto;
139 if ((s.sin_addr.s_addr = inet_addr(hostname)) == -1)
141 struct hostent *host;
143 if ((host = gethostbyname(hostname)) == NULL)
144 Error(ERR_EXIT, "cannot locate host '%s'", hostname);
146 s.sin_addr = *(struct in_addr *)(host->h_addr_list[0]);
150 s.sin_addr.s_addr = inet_addr("127.0.0.1"); /* localhost */
153 port = DEFAULT_SERVER_PORT;
155 s.sin_port = htons(port);
156 s.sin_family = AF_INET;
158 sfd = socket(PF_INET, SOCK_STREAM, 0);
160 Error(ERR_EXIT, "out of file descriptors");
162 if ((tcpproto = getprotobyname("tcp")) != NULL)
163 setsockopt(sfd, tcpproto->p_proto, TCP_NODELAY, (char *)&on, sizeof(int));
165 if (connect(sfd, (struct sockaddr *)&s, sizeof(s)) == 0) /* connected */
168 if (hostname) /* connect to specified server failed */
171 printf("No rocksndiamonds server on localhost - starting up one ...\n");
172 StartNetworkServer(port);
174 /* wait for server to start up and try connecting several times */
177 Delay(500); /* wait 500 ms == 0.5 seconds */
180 sfd = socket(PF_INET, SOCK_STREAM, 0);
182 Error(ERR_EXIT, "out of file descriptors");
184 setsockopt(sfd, tcpproto->p_proto, TCP_NODELAY, (char *)&on, sizeof(int));
186 if (connect(sfd, (struct sockaddr *)&s, sizeof(s)) >= 0) /* connected */
190 /* when reaching this point, connect to newly started server has failed */
194 void SendToServer_PlayerName(char *player_name)
196 int len_player_name = strlen(player_name);
198 buffer[1] = OP_PLAYER_NAME;
199 memcpy(&buffer[2], player_name, len_player_name);
200 SendBufferToServer(2 + len_player_name);
201 Error(ERR_NETWORK_CLIENT, "you set your player name to \"%s\"", player_name);
204 void SendToServer_ProtocolVersion()
206 buffer[1] = OP_PROTOCOL_VERSION;
207 buffer[2] = PROTOCOL_VERSION_1;
208 buffer[3] = PROTOCOL_VERSION_2;
209 buffer[4] = PROTOCOL_VERSION_3;
211 SendBufferToServer(5);
214 void SendToServer_NrWanted(int nr_wanted)
216 buffer[1] = OP_NUMBER_WANTED;
217 buffer[2] = nr_wanted;
219 SendBufferToServer(3);
222 void SendToServer_StartPlaying()
224 unsigned long new_random_seed = InitRND(NEW_RANDOMIZE);
226 buffer[1] = OP_START_PLAYING;
227 buffer[2] = (byte)(level_nr >> 8);
228 buffer[3] = (byte)(level_nr & 0xff);
229 buffer[4] = (byte)(leveldir_nr >> 8);
230 buffer[5] = (byte)(leveldir_nr & 0xff);
232 buffer[6] = (unsigned char)((new_random_seed >> 24) & 0xff);
233 buffer[7] = (unsigned char)((new_random_seed >> 16) & 0xff);
234 buffer[8] = (unsigned char)((new_random_seed >> 8) & 0xff);
235 buffer[9] = (unsigned char)((new_random_seed >> 0) & 0xff);
237 strcpy((char *)&buffer[10], leveldir[leveldir_nr].name);
239 SendBufferToServer(10 + strlen(leveldir[leveldir_nr].name)+1);
242 void SendToServer_PausePlaying()
244 buffer[1] = OP_PAUSE_PLAYING;
246 SendBufferToServer(2);
249 void SendToServer_ContinuePlaying()
251 buffer[1] = OP_CONTINUE_PLAYING;
253 SendBufferToServer(2);
256 void SendToServer_StopPlaying()
258 buffer[1] = OP_STOP_PLAYING;
260 SendBufferToServer(2);
263 void SendToServer_MovePlayer(byte player_action)
265 buffer[1] = OP_MOVE_FIGURE;
266 buffer[2] = player_action;
268 SendBufferToServer(3);
271 static void Handle_OP_BAD_PROTOCOL_VERSION()
273 Error(ERR_WARN, "protocol version mismatch");
274 Error(ERR_EXIT, "server expects %d.%d.x instead of %d.%d.%d",
275 buffer[2], buffer[3],
276 PROTOCOL_VERSION_1, PROTOCOL_VERSION_2, PROTOCOL_VERSION_3);
279 static void Handle_OP_YOUR_NUMBER()
281 int new_client_nr = buffer[2];
282 int new_index_nr = new_client_nr - 1;
283 struct PlayerInfo *old_local_player = local_player;
284 struct PlayerInfo *new_local_player = &stored_player[new_index_nr];
286 printf("OP_YOUR_NUMBER: %d\n", buffer[0]);
287 first_player.nr = new_client_nr;
289 if (old_local_player != new_local_player)
291 /* copy existing player settings and change to new player */
293 *new_local_player = *old_local_player;
294 old_local_player->connected = FALSE;
295 local_player = new_local_player;
298 if (first_player.nr > MAX_PLAYERS)
299 Error(ERR_EXIT, "sorry - no more than %d players", MAX_PLAYERS);
301 Error(ERR_NETWORK_CLIENT, "you get client # %d", new_client_nr);
304 static void Handle_OP_NUMBER_WANTED()
306 int client_nr_wanted = buffer[2];
307 int old_client_nr = buffer[0];
308 int new_client_nr = buffer[3];
309 int old_index_nr = old_client_nr - 1;
310 int new_index_nr = new_client_nr - 1;
311 int index_nr_wanted = client_nr_wanted - 1;
312 struct PlayerInfo *old_player = &stored_player[old_index_nr];
313 struct PlayerInfo *new_player = &stored_player[new_index_nr];
315 printf("OP_NUMBER_WANTED: %d\n", buffer[0]);
317 if (new_client_nr == client_nr_wanted) /* switching succeeded */
319 struct NetworkClientPlayerInfo *player;
321 if (old_client_nr != client_nr_wanted) /* client's nr has changed */
322 Error(ERR_NETWORK_CLIENT, "client %d switches to # %d",
323 old_client_nr, new_client_nr);
324 else if (old_client_nr == first_player.nr) /* local player keeps his nr */
325 Error(ERR_NETWORK_CLIENT, "keeping client # %d", new_client_nr);
327 if (old_client_nr != new_client_nr)
329 /* copy existing player settings and change to new player */
331 *new_player = *old_player;
332 old_player->connected = FALSE;
335 player = getNetworkPlayer(old_client_nr);
336 player->nr = new_client_nr;
338 if (old_player == local_player) /* local player switched */
339 local_player = new_player;
341 else if (old_client_nr == first_player.nr) /* failed -- local player? */
343 char *color[] = { "yellow", "red", "green", "blue" };
346 sprintf(request, "Sorry ! %s player still exists ! You are %s player !",
347 color[index_nr_wanted], color[new_index_nr]);
348 Request(request, REQ_CONFIRM);
350 Error(ERR_NETWORK_CLIENT, "cannot switch -- you keep client # %d",
355 static void Handle_OP_PLAYER_NAME(unsigned int len)
357 struct NetworkClientPlayerInfo *player;
358 int player_nr = (int)buffer[0];
360 printf("OP_PLAYER_NAME: %d\n", player_nr);
361 player = getNetworkPlayer(player_nr);
363 Error(ERR_NETWORK_CLIENT, "client %d calls itself \"%s\"",
364 buffer[0], &buffer[2]);
365 strncpy(player->name, (char *)&buffer[2], MAX_PLAYER_NAME_LEN);
368 static void Handle_OP_PLAYER_CONNECTED()
370 struct NetworkClientPlayerInfo *player, *last_player = NULL;
371 int new_client_nr = (int)buffer[0];
372 int new_index_nr = new_client_nr - 1;
374 printf("OP_PLAYER_CONNECTED: %d\n", new_client_nr);
375 Error(ERR_NETWORK_CLIENT, "new client %d connected", new_client_nr);
377 for (player=&first_player; player; player=player->next)
379 if (player->nr == new_client_nr)
380 Error(ERR_EXIT, "multiplayer server sent duplicate player id");
382 last_player = player;
385 last_player->next = player =
386 checked_malloc(sizeof(struct NetworkClientPlayerInfo));
387 player->nr = new_client_nr;
388 player->name[0] = '\0';
391 stored_player[new_index_nr].connected = TRUE;
394 static void Handle_OP_PLAYER_DISCONNECTED()
396 struct NetworkClientPlayerInfo *player, *player_disconnected;
397 int player_nr = (int)buffer[0];
399 printf("OP_PLAYER_DISCONNECTED: %d\n", player_nr);
400 player_disconnected = getNetworkPlayer(player_nr);
401 Error(ERR_NETWORK_CLIENT, "client %d (%s) disconnected",
402 player_nr, getNetworkPlayerName(buffer[0]));
404 for (player=&first_player; player; player=player->next)
405 if (player->next == player_disconnected)
406 player->next = player_disconnected->next;
407 free(player_disconnected);
410 static void Handle_OP_START_PLAYING()
412 int new_level_nr, new_leveldir_nr;
413 unsigned long new_random_seed;
414 char *new_leveldir_name;
416 new_level_nr = (buffer[2] << 8) + buffer[3];
417 new_leveldir_nr = (buffer[4] << 8) + buffer[5];
419 (buffer[6] << 24) | (buffer[7] << 16) | (buffer[8] << 8) | (buffer[9]);
420 new_leveldir_name = (char *)&buffer[10];
422 printf("OP_START_PLAYING: %d\n", buffer[0]);
423 Error(ERR_NETWORK_CLIENT,
424 "client %d starts game [level %d from levedir %d (%s)]\n",
425 buffer[0], new_level_nr, new_leveldir_nr, new_leveldir_name);
427 if (strcmp(leveldir[new_leveldir_nr].name, new_leveldir_name) != 0)
428 Error(ERR_WARN, "no such level directory: '%s'",new_leveldir_name);
430 leveldir_nr = new_leveldir_nr;
431 level_nr = new_level_nr;
437 if (setup.autorecord)
438 TapeStartRecording();
441 tape.random_seed = new_random_seed;
443 InitRND(new_random_seed);
445 game_status = PLAYING;
449 static void Handle_OP_PAUSE_PLAYING()
451 printf("OP_PAUSE_PLAYING: %d\n", buffer[0]);
452 Error(ERR_NETWORK_CLIENT, "client %d pauses game", buffer[0]);
455 DrawVideoDisplay(VIDEO_STATE_PAUSE_ON,0);
458 static void Handle_OP_CONTINUE_PLAYING()
460 printf("OP_CONTINUE_PLAYING: %d\n", buffer[0]);
461 Error(ERR_NETWORK_CLIENT, "client %d continues game", buffer[0]);
463 tape.pausing = FALSE;
464 DrawVideoDisplay(VIDEO_STATE_PAUSE_OFF,0);
467 static void Handle_OP_STOP_PLAYING()
469 printf("OP_STOP_PLAYING: %d\n", buffer[0]);
470 Error(ERR_NETWORK_CLIENT, "client %d stops game", buffer[0]);
472 game_status = MAINMENU;
476 static void Handle_OP_MOVE_FIGURE(unsigned int len)
478 int server_frame_counter;
481 if (!network_playing)
484 server_frame_counter =
485 (buffer[2] << 24) | (buffer[3] << 16) | (buffer[4] << 8) | (buffer[5]);
487 if (server_frame_counter != FrameCounter)
489 Error(ERR_RETURN, "client and servers frame counters out of sync");
490 Error(ERR_RETURN, "frame counter of client is %d", FrameCounter);
491 Error(ERR_RETURN, "frame counter of server is %d", server_frame_counter);
492 Error(ERR_EXIT, "this should not happen -- please debug");
495 /* copy valid player actions */
496 for (i=0; i<MAX_PLAYERS; i++)
497 stored_player[i].effective_action =
498 (i < len - 6 && stored_player[i].active ? buffer[6 + i] : 0);
500 network_player_action_received = TRUE;
503 static void HandleNetworkingMessages()
505 unsigned int message_length;
507 while (nread >= 4 && nread >= 4 + readbuffer[3])
509 message_length = readbuffer[3];
510 if (readbuffer[0] || readbuffer[1] || readbuffer[2])
511 Error(ERR_EXIT, "wrong network server line length");
513 memcpy(buffer, &readbuffer[4], message_length);
514 nread -= 4 + message_length;
515 memmove(readbuffer, readbuffer + 4 + message_length, nread);
519 case OP_BAD_PROTOCOL_VERSION:
520 Handle_OP_BAD_PROTOCOL_VERSION();
524 Handle_OP_YOUR_NUMBER();
527 case OP_NUMBER_WANTED:
528 Handle_OP_NUMBER_WANTED();
532 Handle_OP_PLAYER_NAME(message_length);
535 case OP_PLAYER_CONNECTED:
536 Handle_OP_PLAYER_CONNECTED();
539 case OP_PLAYER_DISCONNECTED:
540 Handle_OP_PLAYER_DISCONNECTED();
543 case OP_START_PLAYING:
544 Handle_OP_START_PLAYING();
547 case OP_PAUSE_PLAYING:
548 Handle_OP_PAUSE_PLAYING();
551 case OP_CONTINUE_PLAYING:
552 Handle_OP_CONTINUE_PLAYING();
555 case OP_STOP_PLAYING:
556 Handle_OP_STOP_PLAYING();
560 Handle_OP_MOVE_FIGURE(message_length);
563 case OP_BROADCAST_MESSAGE:
564 printf("OP_BROADCAST_MESSAGE: %d\n", buffer[0]);
565 Error(ERR_NETWORK_CLIENT, "client %d sends message", buffer[0]);
573 void HandleNetworking()
575 static struct timeval tv = { 0, 0 };
582 r = select(sfd + 1, &rfds, NULL, NULL, &tv);
584 if (r < 0 && errno != EINTR)
585 Error(ERR_EXIT, "HandleNetworking(): select() failed");
590 if (FD_ISSET(sfd, &rfds))
594 r = read(sfd, readbuffer + nread, MAX_BUFFER_SIZE - nread);
597 Error(ERR_EXIT, "error reading from network server");
600 Error(ERR_EXIT, "connection to network server lost");
604 HandleNetworkingMessages();