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 #define MAX_PLAYER_NAME_LEN 14
38 struct NetworkClientPlayerInfo
41 char name[MAX_PLAYER_NAME_LEN + 2];
42 struct NetworkClientPlayerInfo *next;
45 static struct NetworkClientPlayerInfo first_player =
55 static byte realbuffer[512];
56 static byte readbuffer[MAX_BUFFER_SIZE], writbuffer[MAX_BUFFER_SIZE];
57 static byte *buffer = realbuffer + 4;
58 static int nread = 0, nwrite = 0;
60 static void SendBufferToServer(int size)
65 realbuffer[0] = realbuffer[1] = realbuffer[2] = 0;
66 realbuffer[3] = (byte)size;
69 if (nwrite + 4 + size >= MAX_BUFFER_SIZE)
70 Error(ERR_EXIT, "internal error: network send buffer overflow");
72 memcpy(writbuffer + nwrite, realbuffer, 4 + size);
75 /* directly send the buffer to the network server */
76 write(sfd, writbuffer, nwrite);
80 struct NetworkClientPlayerInfo *getNetworkPlayer(int player_nr)
82 struct NetworkClientPlayerInfo *player = NULL;
84 for (player = &first_player; player; player = player->next)
85 if (player->nr == player_nr)
88 if (player == NULL) /* should not happen */
89 Error(ERR_EXIT, "protocol error: reference to non-existing player %d",
95 char *getNetworkPlayerName(int player_nr)
97 struct NetworkClientPlayerInfo *player;
100 return("the network game server");
101 else if (player_nr == first_player.nr)
104 for (player=&first_player; player; player=player->next)
105 if (player->nr == player_nr && player->name && strlen(player->name))
106 return(player->name);
108 return(EMPTY_PLAYER_NAME);
111 static void StartNetworkServer(int port)
116 NetworkServer(port, options.serveronly);
123 "cannot create network server process - no network playing");
124 options.network = FALSE;
128 /* we are parent process -- resume normal operation */
133 boolean ConnectToServer(char *hostname, int port)
135 struct sockaddr_in s;
136 struct protoent *tcpproto;
141 if ((s.sin_addr.s_addr = inet_addr(hostname)) == -1)
143 struct hostent *host;
145 if ((host = gethostbyname(hostname)) == NULL)
146 Error(ERR_EXIT, "cannot locate host '%s'", hostname);
148 s.sin_addr = *(struct in_addr *)(host->h_addr_list[0]);
152 s.sin_addr.s_addr = inet_addr("127.0.0.1"); /* localhost */
155 port = DEFAULT_SERVER_PORT;
157 s.sin_port = htons(port);
158 s.sin_family = AF_INET;
160 sfd = socket(PF_INET, SOCK_STREAM, 0);
162 Error(ERR_EXIT, "out of file descriptors");
164 if ((tcpproto = getprotobyname("tcp")) != NULL)
165 setsockopt(sfd, tcpproto->p_proto, TCP_NODELAY, (char *)&on, sizeof(int));
167 if (connect(sfd, (struct sockaddr *)&s, sizeof(s)) == 0) /* connected */
170 if (hostname) /* connect to specified server failed */
173 printf("No rocksndiamonds server on localhost - starting up one ...\n");
174 StartNetworkServer(port);
176 /* wait for server to start up and try connecting several times */
179 Delay(500); /* wait 500 ms == 0.5 seconds */
182 sfd = socket(PF_INET, SOCK_STREAM, 0);
184 Error(ERR_EXIT, "out of file descriptors");
186 setsockopt(sfd, tcpproto->p_proto, TCP_NODELAY, (char *)&on, sizeof(int));
188 if (connect(sfd, (struct sockaddr *)&s, sizeof(s)) >= 0) /* connected */
192 /* when reaching this point, connect to newly started server has failed */
196 void SendToServer_PlayerName(char *player_name)
198 int len_player_name = strlen(player_name);
200 buffer[1] = OP_PLAYER_NAME;
201 memcpy(&buffer[2], player_name, len_player_name);
202 SendBufferToServer(2 + len_player_name);
203 Error(ERR_NETWORK_CLIENT, "you set your player name to \"%s\"", player_name);
206 void SendToServer_ProtocolVersion()
208 buffer[1] = OP_PROTOCOL_VERSION;
209 buffer[2] = PROTOCOL_VERSION_1;
210 buffer[3] = PROTOCOL_VERSION_2;
211 buffer[4] = PROTOCOL_VERSION_3;
213 SendBufferToServer(5);
216 void SendToServer_NrWanted(int nr_wanted)
218 buffer[1] = OP_NUMBER_WANTED;
219 buffer[2] = nr_wanted;
221 SendBufferToServer(3);
224 void SendToServer_StartPlaying()
226 unsigned long new_random_seed = InitRND(NEW_RANDOMIZE);
228 buffer[1] = OP_START_PLAYING;
229 buffer[2] = (byte)(level_nr >> 8);
230 buffer[3] = (byte)(level_nr & 0xff);
231 buffer[4] = (byte)(leveldir_nr >> 8);
232 buffer[5] = (byte)(leveldir_nr & 0xff);
234 buffer[6] = (unsigned char)((new_random_seed >> 24) & 0xff);
235 buffer[7] = (unsigned char)((new_random_seed >> 16) & 0xff);
236 buffer[8] = (unsigned char)((new_random_seed >> 8) & 0xff);
237 buffer[9] = (unsigned char)((new_random_seed >> 0) & 0xff);
239 strcpy((char *)&buffer[10], leveldir[leveldir_nr].name);
241 SendBufferToServer(10 + strlen(leveldir[leveldir_nr].name)+1);
244 void SendToServer_PausePlaying()
246 buffer[1] = OP_PAUSE_PLAYING;
248 SendBufferToServer(2);
251 void SendToServer_ContinuePlaying()
253 buffer[1] = OP_CONTINUE_PLAYING;
255 SendBufferToServer(2);
258 void SendToServer_StopPlaying()
260 buffer[1] = OP_STOP_PLAYING;
262 SendBufferToServer(2);
265 void SendToServer_MovePlayer(byte player_action)
267 buffer[1] = OP_MOVE_FIGURE;
268 buffer[2] = player_action;
270 SendBufferToServer(3);
273 static void Handle_OP_BAD_PROTOCOL_VERSION()
275 Error(ERR_WARN, "protocol version mismatch");
276 Error(ERR_EXIT, "server expects %d.%d.x instead of %d.%d.%d",
277 buffer[2], buffer[3],
278 PROTOCOL_VERSION_1, PROTOCOL_VERSION_2, PROTOCOL_VERSION_3);
281 static void Handle_OP_YOUR_NUMBER()
283 int new_client_nr = buffer[2];
284 int new_index_nr = new_client_nr - 1;
285 struct PlayerInfo *old_local_player = local_player;
286 struct PlayerInfo *new_local_player = &stored_player[new_index_nr];
288 printf("OP_YOUR_NUMBER: %d\n", buffer[0]);
289 first_player.nr = new_client_nr;
291 if (old_local_player != new_local_player)
293 /* copy existing player settings and change to new player */
295 *new_local_player = *old_local_player;
296 old_local_player->connected = FALSE;
297 local_player = new_local_player;
300 if (first_player.nr > MAX_PLAYERS)
301 Error(ERR_EXIT, "sorry - no more than %d players", MAX_PLAYERS);
303 Error(ERR_NETWORK_CLIENT, "you get client # %d", new_client_nr);
306 static void Handle_OP_NUMBER_WANTED()
308 int client_nr_wanted = buffer[2];
309 int old_client_nr = buffer[0];
310 int new_client_nr = buffer[3];
311 int old_index_nr = old_client_nr - 1;
312 int new_index_nr = new_client_nr - 1;
313 int index_nr_wanted = client_nr_wanted - 1;
314 struct PlayerInfo *old_player = &stored_player[old_index_nr];
315 struct PlayerInfo *new_player = &stored_player[new_index_nr];
317 printf("OP_NUMBER_WANTED: %d\n", buffer[0]);
319 if (new_client_nr == client_nr_wanted) /* switching succeeded */
321 struct NetworkClientPlayerInfo *player;
323 if (old_client_nr != client_nr_wanted) /* client's nr has changed */
324 Error(ERR_NETWORK_CLIENT, "client %d switches to # %d",
325 old_client_nr, new_client_nr);
326 else if (old_client_nr == first_player.nr) /* local player keeps his nr */
327 Error(ERR_NETWORK_CLIENT, "keeping client # %d", new_client_nr);
329 if (old_client_nr != new_client_nr)
331 /* copy existing player settings and change to new player */
333 *new_player = *old_player;
334 old_player->connected = FALSE;
337 player = getNetworkPlayer(old_client_nr);
338 player->nr = new_client_nr;
340 if (old_player == local_player) /* local player switched */
341 local_player = new_player;
343 else if (old_client_nr == first_player.nr) /* failed -- local player? */
345 char *color[] = { "yellow", "red", "green", "blue" };
348 sprintf(request, "Sorry ! %s player still exists ! You are %s player !",
349 color[index_nr_wanted], color[new_index_nr]);
350 Request(request, REQ_CONFIRM);
352 Error(ERR_NETWORK_CLIENT, "cannot switch -- you keep client # %d",
357 static void Handle_OP_PLAYER_NAME(unsigned int len)
359 struct NetworkClientPlayerInfo *player;
360 int player_nr = (int)buffer[0];
362 printf("OP_PLAYER_NAME: %d\n", player_nr);
363 player = getNetworkPlayer(player_nr);
365 Error(ERR_NETWORK_CLIENT, "client %d calls itself \"%s\"",
366 buffer[0], &buffer[2]);
367 strncpy(player->name, (char *)&buffer[2], MAX_PLAYER_NAME_LEN);
370 static void Handle_OP_PLAYER_CONNECTED()
372 struct NetworkClientPlayerInfo *player, *last_player = NULL;
373 int new_client_nr = (int)buffer[0];
374 int new_index_nr = new_client_nr - 1;
376 printf("OP_PLAYER_CONNECTED: %d\n", new_client_nr);
377 Error(ERR_NETWORK_CLIENT, "new client %d connected", new_client_nr);
379 for (player=&first_player; player; player=player->next)
381 if (player->nr == new_client_nr)
382 Error(ERR_EXIT, "multiplayer server sent duplicate player id");
384 last_player = player;
387 last_player->next = player =
388 checked_malloc(sizeof(struct NetworkClientPlayerInfo));
389 player->nr = new_client_nr;
390 player->name[0] = '\0';
393 stored_player[new_index_nr].connected = TRUE;
396 static void Handle_OP_PLAYER_DISCONNECTED()
398 struct NetworkClientPlayerInfo *player, *player_disconnected;
399 int player_nr = (int)buffer[0];
401 printf("OP_PLAYER_DISCONNECTED: %d\n", player_nr);
402 player_disconnected = getNetworkPlayer(player_nr);
403 Error(ERR_NETWORK_CLIENT, "client %d (%s) disconnected",
404 player_nr, getNetworkPlayerName(buffer[0]));
406 for (player=&first_player; player; player=player->next)
407 if (player->next == player_disconnected)
408 player->next = player_disconnected->next;
409 free(player_disconnected);
412 static void Handle_OP_START_PLAYING()
414 int new_level_nr, new_leveldir_nr;
415 unsigned long new_random_seed;
416 char *new_leveldir_name;
418 new_level_nr = (buffer[2] << 8) + buffer[3];
419 new_leveldir_nr = (buffer[4] << 8) + buffer[5];
421 (buffer[6] << 24) | (buffer[7] << 16) | (buffer[8] << 8) | (buffer[9]);
422 new_leveldir_name = (char *)&buffer[10];
424 printf("OP_START_PLAYING: %d\n", buffer[0]);
425 Error(ERR_NETWORK_CLIENT,
426 "client %d starts game [level %d from levedir %d (%s)]\n",
427 buffer[0], new_level_nr, new_leveldir_nr, new_leveldir_name);
429 if (strcmp(leveldir[new_leveldir_nr].name, new_leveldir_name) != 0)
430 Error(ERR_WARN, "no such level directory: '%s'",new_leveldir_name);
432 leveldir_nr = new_leveldir_nr;
433 level_nr = new_level_nr;
439 if (setup.autorecord)
440 TapeStartRecording();
443 tape.random_seed = new_random_seed;
445 InitRND(new_random_seed);
447 game_status = PLAYING;
451 static void Handle_OP_PAUSE_PLAYING()
453 printf("OP_PAUSE_PLAYING: %d\n", buffer[0]);
454 Error(ERR_NETWORK_CLIENT, "client %d pauses game", buffer[0]);
457 DrawVideoDisplay(VIDEO_STATE_PAUSE_ON,0);
460 static void Handle_OP_CONTINUE_PLAYING()
462 printf("OP_CONTINUE_PLAYING: %d\n", buffer[0]);
463 Error(ERR_NETWORK_CLIENT, "client %d continues game", buffer[0]);
465 tape.pausing = FALSE;
466 DrawVideoDisplay(VIDEO_STATE_PAUSE_OFF,0);
469 static void Handle_OP_STOP_PLAYING()
471 printf("OP_STOP_PLAYING: %d\n", buffer[0]);
472 Error(ERR_NETWORK_CLIENT, "client %d stops game", buffer[0]);
474 game_status = MAINMENU;
478 static void Handle_OP_MOVE_FIGURE(unsigned int len)
480 int server_frame_counter;
483 if (!network_playing)
486 server_frame_counter =
487 (buffer[2] << 24) | (buffer[3] << 16) | (buffer[4] << 8) | (buffer[5]);
489 if (server_frame_counter != FrameCounter)
491 Error(ERR_RETURN, "client and servers frame counters out of sync");
492 Error(ERR_RETURN, "frame counter of client is %d", FrameCounter);
493 Error(ERR_RETURN, "frame counter of server is %d", server_frame_counter);
494 Error(ERR_EXIT, "this should not happen -- please debug");
497 /* copy valid player actions */
498 for (i=0; i<MAX_PLAYERS; i++)
499 stored_player[i].effective_action =
500 (i < len - 6 && stored_player[i].active ? buffer[6 + i] : 0);
502 network_player_action_received = TRUE;
505 static void HandleNetworkingMessages()
507 unsigned int message_length;
509 while (nread >= 4 && nread >= 4 + readbuffer[3])
511 message_length = readbuffer[3];
512 if (readbuffer[0] || readbuffer[1] || readbuffer[2])
513 Error(ERR_EXIT, "wrong network server line length");
515 memcpy(buffer, &readbuffer[4], message_length);
516 nread -= 4 + message_length;
517 memmove(readbuffer, readbuffer + 4 + message_length, nread);
521 case OP_BAD_PROTOCOL_VERSION:
522 Handle_OP_BAD_PROTOCOL_VERSION();
526 Handle_OP_YOUR_NUMBER();
529 case OP_NUMBER_WANTED:
530 Handle_OP_NUMBER_WANTED();
534 Handle_OP_PLAYER_NAME(message_length);
537 case OP_PLAYER_CONNECTED:
538 Handle_OP_PLAYER_CONNECTED();
541 case OP_PLAYER_DISCONNECTED:
542 Handle_OP_PLAYER_DISCONNECTED();
545 case OP_START_PLAYING:
546 Handle_OP_START_PLAYING();
549 case OP_PAUSE_PLAYING:
550 Handle_OP_PAUSE_PLAYING();
553 case OP_CONTINUE_PLAYING:
554 Handle_OP_CONTINUE_PLAYING();
557 case OP_STOP_PLAYING:
558 Handle_OP_STOP_PLAYING();
562 Handle_OP_MOVE_FIGURE(message_length);
565 case OP_BROADCAST_MESSAGE:
566 printf("OP_BROADCAST_MESSAGE: %d\n", buffer[0]);
567 Error(ERR_NETWORK_CLIENT, "client %d sends message", buffer[0]);
575 void HandleNetworking()
577 static struct timeval tv = { 0, 0 };
584 r = select(sfd + 1, &rfds, NULL, NULL, &tv);
586 if (r < 0 && errno != EINTR)
587 Error(ERR_EXIT, "HandleNetworking(): select() failed");
592 if (FD_ISSET(sfd, &rfds))
596 r = read(sfd, readbuffer + nread, MAX_BUFFER_SIZE - nread);
599 Error(ERR_EXIT, "error reading from network server");
602 Error(ERR_EXIT, "connection to network server lost");
606 HandleNetworkingMessages();