src/netserv.c

   1 /***********************************************************
   2 * Rocks'n'Diamonds -- McDuffin Strikes Back!               *
   3 *----------------------------------------------------------*
   4 * (c) 1995-2002 Artsoft Entertainment                      *
   5 *               Holger Schemel                             *
   6 *               Detmolder Strasse 189                      *
   7 *               33604 Bielefeld                            *
   8 *               Germany                                    *
   9 *               e-mail: info@artsoft.org                   *
  10 *----------------------------------------------------------*
  11 * netserv.c                                                *
  12 ***********************************************************/
  13
  14 #include "libgame/platform.h"
  15
  16 #if defined(NETWORK_AVALIABLE)
  17
  18 #include <fcntl.h>
  19 #include <sys/time.h>
  20 #include <signal.h>
  21 #include <errno.h>
  22
  23 #if defined(TARGET_SDL)
  24 #include "main.h"
  25 #else
  26 #include <sys/socket.h>
  27 #include <netinet/in.h>
  28 #include <netinet/tcp.h>
  29 #include <arpa/inet.h>
  30 #include <netdb.h>
  31 #include <sys/select.h>                 /* apparently needed for OS/2 port */
  32 #endif
  33
  34 #include "libgame/libgame.h"
  35
  36 #include "netserv.h"
  37
  38 static int clients = 0;
  39 static int onceonly = 0;
  40
  41 struct NetworkServerPlayerInfo
  42 {
  43 #if defined(TARGET_SDL)
  44   TCPsocket fd;
  45 #else
  46   int fd;
  47 #endif
  48
  49   char player_name[16];
  50   unsigned char number;
  51   struct NetworkServerPlayerInfo *next;
  52   char active;
  53   char introduced;
  54   unsigned char readbuffer[MAX_BUFFER_SIZE];
  55   unsigned char writbuffer[MAX_BUFFER_SIZE];
  56   int nread, nwrite;
  57   byte action;
  58   boolean action_received;
  59 };
  60
  61 static struct NetworkServerPlayerInfo *first_player = NULL;
  62
  63 #define NEXT(player) ((player)->next ? (player)->next : first_player)
  64
  65 #if defined(TARGET_SDL)
  66 /* TODO: peer address */
  67 static TCPsocket lfd;           /* listening socket */
  68 static SDLNet_SocketSet fds;    /* socket set */
  69 #else
  70 static struct sockaddr_in saddr;
  71 static int lfd;                 /* listening socket */
  72 static fd_set fds;              /* socket set */
  73 static int tcp = -1;
  74 #endif
  75
  76 static unsigned char realbuffer[512], *buffer = realbuffer + 4;
  77
  78 static int interrupt;
  79
  80 static unsigned long ServerFrameCounter = 0;
  81
  82 static void addtobuffer(struct NetworkServerPlayerInfo *player,
  83                         unsigned char *b, int len)
  84 {
  85   if (player->nwrite + len >= MAX_BUFFER_SIZE)
  86     Error(ERR_EXIT_NETWORK_SERVER,
  87           "internal error: network send buffer overflow");
  88
  89   memcpy(player->writbuffer + player->nwrite, b, len);
  90   player->nwrite += len;
  91 }
  92
  93 static void flushuser(struct NetworkServerPlayerInfo *player)
  94 {
  95   if (player->nwrite)
  96   {
  97 #if defined(TARGET_SDL)
  98     SDLNet_TCP_Send(player->fd, player->writbuffer, player->nwrite);
  99 #else
 100     write(player->fd, player->writbuffer, player->nwrite);
 101 #endif
 102     player->nwrite = 0;
 103   }
 104 }
 105
 106 static void broadcast(struct NetworkServerPlayerInfo *except,
 107                       int len, int activeonly)
 108 {
 109   struct NetworkServerPlayerInfo *player;
 110
 111   realbuffer[0] = realbuffer[1] = realbuffer[2] = 0;
 112   realbuffer[3] = (unsigned char)len;
 113   for (player = first_player; player; player = player->next)
 114     if (player != except && player->introduced &&
 115         (player->active || !activeonly))
 116       addtobuffer(player, realbuffer, 4 + len);
 117 }
 118
 119 static void sendtoone(struct NetworkServerPlayerInfo *to, int len)
 120 {
 121   realbuffer[0] = realbuffer[1] = realbuffer[2] = 0;
 122   realbuffer[3] = (unsigned char)len;
 123   addtobuffer(to, realbuffer, 4 + len);
 124 }
 125
 126 static void RemovePlayer(struct NetworkServerPlayerInfo *player)
 127 {
 128   struct NetworkServerPlayerInfo *v;
 129
 130   if (options.verbose)
 131     Error(ERR_NETWORK_SERVER, "dropping client %d (%s)",
 132           player->number, player->player_name);
 133
 134   if (player == first_player)
 135     first_player = player->next;
 136   else
 137   {
 138     for (v = first_player; v; v = v->next)
 139     {
 140       if (v->next && v->next == player)
 141       {
 142         v->next = player->next;
 143         break;
 144       }
 145     }
 146   }
 147
 148 #if defined(TARGET_SDL)
 149   SDLNet_TCP_DelSocket(fds, player->fd);
 150   SDLNet_TCP_Close(player->fd);
 151 #else
 152   close(player->fd);
 153 #endif
 154
 155   if (player->introduced)
 156   {
 157     buffer[0] = player->number;
 158     buffer[1] = OP_PLAYER_DISCONNECTED;
 159     broadcast(player, 2, 0);
 160   }
 161
 162   free(player);
 163   clients--;
 164
 165   if (onceonly && clients == 0)
 166   {
 167     if (options.verbose)
 168     {
 169       Error(ERR_NETWORK_SERVER, "no clients left");
 170       Error(ERR_NETWORK_SERVER, "aborting");
 171     }
 172     exit(0);
 173   }
 174 }
 175
 176 #if defined(TARGET_SDL)
 177 static void AddPlayer(TCPsocket fd)
 178 #else
 179 static void AddPlayer(int fd)
 180 #endif
 181 {
 182   struct NetworkServerPlayerInfo *player, *v;
 183   unsigned char nxn;
 184   boolean again = TRUE;
 185
 186   player = checked_malloc(sizeof (struct NetworkServerPlayerInfo));
 187
 188   player->fd = fd;
 189   player->player_name[0] = 0;
 190   player->next = first_player;
 191   player->active = 0;
 192   player->nread = 0;
 193   player->nwrite = 0;
 194   player->introduced = 0;
 195   player->action = 0;
 196   player->action_received = FALSE;
 197
 198 #if defined(TARGET_SDL)
 199   SDLNet_TCP_AddSocket(fds, fd);
 200 #endif
 201
 202   first_player = player;
 203
 204   nxn = 1;
 205
 206   while (again)
 207   {
 208     again = FALSE;
 209     v = player->next;
 210
 211     while (v)
 212     {
 213       if (v->number == nxn)
 214       {
 215         nxn++;
 216
 217         again = TRUE;
 218         break;
 219       }
 220       v = v->next;
 221     }
 222   }
 223
 224   player->number = nxn;
 225 #if !defined(TARGET_SDL)
 226   if (options.verbose)
 227     Error(ERR_NETWORK_SERVER, "client %d connecting from %s",
 228           nxn, inet_ntoa(saddr.sin_addr));
 229 #endif
 230   clients++;
 231
 232   buffer[0] = 0;
 233   buffer[1] = OP_YOUR_NUMBER;
 234   buffer[2] = player->number;
 235   sendtoone(player, 3);
 236 }
 237
 238 static void Handle_OP_PROTOCOL_VERSION(struct NetworkServerPlayerInfo *player,
 239                                        unsigned int len)
 240 {
 241   if (len != 5 ||
 242       buffer[2] != PROTOCOL_VERSION_1 ||
 243       buffer[3] != PROTOCOL_VERSION_2)
 244   {
 245     if (options.verbose)
 246       Error(ERR_NETWORK_SERVER,
 247             "client %d (%s) has wrong protocol version %d.%d.%d",
 248             player->number, player->player_name, buffer[2], buffer[3], buffer[4]);
 249
 250     buffer[0] = 0;
 251     buffer[1] = OP_BAD_PROTOCOL_VERSION;
 252     buffer[2] = PROTOCOL_VERSION_1;
 253     buffer[3] = PROTOCOL_VERSION_2;
 254     buffer[4] = PROTOCOL_VERSION_3;
 255     sendtoone(player, 5);
 256     flushuser(player);
 257
 258     RemovePlayer(player);
 259     interrupt = 1;
 260   }
 261   else
 262   {
 263     if (options.verbose)
 264       Error(ERR_NETWORK_SERVER,
 265             "client %d (%s) uses protocol version %d.%d.%d",
 266             player->number, player->player_name, buffer[2], buffer[3], buffer[4]);
 267   }
 268 }
 269
 270 static void Handle_OP_NUMBER_WANTED(struct NetworkServerPlayerInfo *player)
 271 {
 272   struct NetworkServerPlayerInfo *v;
 273   int client_nr = player->number;
 274   int nr_wanted = buffer[2];
 275   int nr_is_free = 1;
 276
 277   if (options.verbose)
 278       Error(ERR_NETWORK_SERVER, "client %d (%s) wants to switch to # %d",
 279             player->number, player->player_name, nr_wanted);
 280
 281   for (v = first_player; v; v = v->next)
 282   {
 283     if (v->number == nr_wanted)
 284     {
 285       nr_is_free = 0;
 286       break;
 287     }
 288   }
 289
 290   if (options.verbose)
 291   {
 292     if (nr_is_free)
 293       Error(ERR_NETWORK_SERVER, "client %d (%s) switches to # %d",
 294             player->number, player->player_name, nr_wanted);
 295     else if (player->number == nr_wanted)
 296       Error(ERR_NETWORK_SERVER, "client %d (%s) still has # %d",
 297             player->number, player->player_name, nr_wanted);
 298     else
 299       Error(ERR_NETWORK_SERVER,
 300             "client %d (%s) cannot switch (client %d still exists)",
 301             player->number, player->player_name, nr_wanted);
 302   }
 303
 304   if (nr_is_free)
 305     player->number = nr_wanted;
 306
 307   buffer[0] = client_nr;
 308   buffer[1] = OP_NUMBER_WANTED;
 309   buffer[2] = nr_wanted;
 310   buffer[3] = player->number;
 311
 312   /*
 313   sendtoone(player, 4);
 314   */
 315
 316   broadcast(NULL, 4, 0);
 317 }
 318
 319 static void Handle_OP_PLAYER_NAME(struct NetworkServerPlayerInfo *player,
 320                                   unsigned int len)
 321 {
 322   struct NetworkServerPlayerInfo *v;
 323   int i;
 324
 325   if (len>16)
 326     len=16;
 327   memcpy(player->player_name, &buffer[2], len-2);
 328   player->player_name[len-2] = 0;
 329   for (i = 0; i < len - 2; i++)
 330   {
 331     if (player->player_name[i] < ' ' ||
 332         ((unsigned char)(player->player_name[i]) > 0x7e &&
 333          (unsigned char)(player->player_name[i]) <= 0xa0))
 334     {
 335       player->player_name[i] = 0;
 336       break;
 337     }
 338   }
 339
 340   if (!player->introduced)
 341   {
 342     buffer[0] = player->number;
 343     buffer[1] = OP_PLAYER_CONNECTED;
 344     broadcast(player, 2, 0);
 345   }
 346
 347   if (options.verbose)
 348     Error(ERR_NETWORK_SERVER, "client %d calls itself \"%s\"",
 349           player->number, player->player_name);
 350   buffer[1] = OP_PLAYER_NAME;
 351   broadcast(player, len, 0);
 352
 353   if (!player->introduced)
 354   {
 355     for (v = first_player; v; v = v->next)
 356     {
 357       if (v != player && v->introduced)
 358       {
 359         buffer[0] = v->number;
 360         buffer[1] = OP_PLAYER_CONNECTED;
 361         sendtoone(player, 2);
 362         buffer[1] = OP_PLAYER_NAME;
 363         memcpy(&buffer[2], v->player_name, 14);
 364         sendtoone(player, 2+strlen(v->player_name));
 365       }
 366     }
 367   }
 368
 369   player->introduced = 1;
 370 }
 371
 372 static void Handle_OP_START_PLAYING(struct NetworkServerPlayerInfo *player)
 373 {
 374   struct NetworkServerPlayerInfo *v, *w;
 375
 376   if (options.verbose)
 377     Error(ERR_NETWORK_SERVER,
 378           "client %d (%s) starts game [level %d from levedir %d (%s)]",
 379           player->number, player->player_name,
 380           (buffer[2] << 8) + buffer[3],
 381           (buffer[4] << 8) + buffer[5],
 382           &buffer[6]);
 383
 384   for (w = first_player; w; w = w->next)
 385     if (w->introduced)
 386       w->active = 1;
 387
 388   /* reset frame counter */
 389   ServerFrameCounter = 0;
 390
 391   /* reset player actions */
 392   for (v = first_player; v; v = v->next)
 393   {
 394     v->action = 0;
 395     v->action_received = FALSE;
 396   }
 397
 398   broadcast(NULL, 10 + strlen((char *)&buffer[10])+1, 0);
 399 }
 400
 401 static void Handle_OP_PAUSE_PLAYING(struct NetworkServerPlayerInfo *player)
 402 {
 403   if (options.verbose)
 404     Error(ERR_NETWORK_SERVER, "client %d (%s) pauses game",
 405           player->number, player->player_name);
 406   broadcast(NULL, 2, 0);
 407 }
 408
 409 static void Handle_OP_CONTINUE_PLAYING(struct NetworkServerPlayerInfo *player)
 410 {
 411   if (options.verbose)
 412     Error(ERR_NETWORK_SERVER, "client %d (%s) continues game",
 413           player->number, player->player_name);
 414   broadcast(NULL, 2, 0);
 415 }
 416
 417 static void Handle_OP_STOP_PLAYING(struct NetworkServerPlayerInfo *player)
 418 {
 419   if (options.verbose)
 420     Error(ERR_NETWORK_SERVER, "client %d (%s) stops game",
 421           player->number, player->player_name);
 422   broadcast(NULL, 2, 0);
 423 }
 424
 425 static void Handle_OP_MOVE_PLAYER(struct NetworkServerPlayerInfo *player)
 426 {
 427   struct NetworkServerPlayerInfo *v;
 428   int last_client_nr = 0;
 429   int i;
 430
 431   /* store player action */
 432   for (v = first_player; v; v = v->next)
 433   {
 434     if (v->number == player->number)
 435     {
 436       v->action = buffer[2];
 437       v->action_received = TRUE;
 438     }
 439   }
 440
 441   /* check if server received action from each player */
 442   for (v = first_player; v; v = v->next)
 443   {
 444     if (!v->action_received)
 445       return;
 446
 447     if (v->number > last_client_nr)
 448       last_client_nr = v->number;
 449   }
 450
 451   /* initialize all player actions to zero */
 452   for (i = 0; i < last_client_nr; i++)
 453     buffer[6 + i] = 0;
 454
 455   /* broadcast actions of all players to all players */
 456   for (v = first_player; v; v = v->next)
 457   {
 458     buffer[6 + v->number-1] = v->action;
 459     v->action = 0;
 460     v->action_received = FALSE;
 461   }
 462
 463   buffer[2] = (unsigned char)((ServerFrameCounter >> 24) & 0xff);
 464   buffer[3] = (unsigned char)((ServerFrameCounter >> 16) & 0xff);
 465   buffer[4] = (unsigned char)((ServerFrameCounter >>  8) & 0xff);
 466   buffer[5] = (unsigned char)((ServerFrameCounter >>  0) & 0xff);
 467
 468   broadcast(NULL, 6 + last_client_nr, 0);
 469
 470   ServerFrameCounter++;
 471 }
 472
 473 #if defined(TARGET_SDL)
 474 /* the following is not used for a standalone server;
 475    the pointer points to an integer containing the port-number */
 476 int NetworkServerThread(void *ptr)
 477 {
 478   NetworkServer(*((int *) ptr), 0);
 479
 480   /* should never be reached */
 481   return 0;
 482 }
 483 #endif
 484
 485 void NetworkServer(int port, int serveronly)
 486 {
 487   int sl;
 488   struct NetworkServerPlayerInfo *player;
 489   int r;
 490   unsigned int len;
 491 #if defined(TARGET_SDL)
 492   IPaddress ip;
 493 #else
 494   int i, on;
 495   int is_daemon = 0;
 496   struct protoent *tcpproto;
 497   struct timeval tv;
 498   int mfd;
 499 #endif
 500
 501 #if defined(PLATFORM_UNIX) && !defined(PLATFORM_NEXT)
 502   struct sigaction sact;
 503 #endif
 504
 505   if (port == 0)
 506     port = DEFAULT_SERVER_PORT;
 507
 508   if (!serveronly)
 509     onceonly = 1;
 510
 511 #if !defined(TARGET_SDL)
 512   if ((tcpproto = getprotobyname("tcp")) != NULL)
 513     tcp = tcpproto->p_proto;
 514 #endif
 515
 516 #if defined(PLATFORM_UNIX)
 517 #if defined(PLATFORM_NEXT)
 518   signal(SIGPIPE, SIG_IGN);
 519 #else
 520   sact.sa_handler = SIG_IGN;
 521   sigemptyset(&sact.sa_mask);
 522   sact.sa_flags = 0;
 523   sigaction(SIGPIPE, &sact, NULL);
 524 #endif
 525 #endif
 526
 527 #if defined(TARGET_SDL)
 528
 529   /* assume that SDL is already initialized */
 530 #if 0
 531   if (SDLNet_Init() == -1)
 532     Error(ERR_EXIT_NETWORK_SERVER, "SDLNet_Init() failed");
 533   atexit(SDLNet_Quit);
 534 #endif
 535
 536   if (SDLNet_ResolveHost(&ip, NULL, port) == -1)
 537     Error(ERR_EXIT_NETWORK_SERVER, "SDLNet_ResolveHost() failed");
 538
 539   lfd = SDLNet_TCP_Open(&ip);
 540   if (!lfd)
 541     Error(ERR_EXIT_NETWORK_SERVER, "SDLNet_TCP_Open() failed");
 542
 543   fds = SDLNet_AllocSocketSet(MAX_PLAYERS+1);
 544   SDLNet_TCP_AddSocket(fds, lfd);
 545
 546 #else
 547
 548   if ((lfd = socket(PF_INET, SOCK_STREAM, 0)) < 0)
 549     Error(ERR_EXIT_NETWORK_SERVER, "socket() failed");
 550
 551   saddr.sin_family = AF_INET;
 552   saddr.sin_addr.s_addr = htonl(INADDR_ANY);
 553   saddr.sin_port = htons(port);
 554
 555   on = 1;
 556
 557   setsockopt(lfd, SOL_SOCKET, SO_REUSEADDR, (char *)&on, sizeof(int));
 558   if (bind(lfd, (struct sockaddr *)&saddr, sizeof(saddr)) < 0)
 559     Error(ERR_EXIT_NETWORK_SERVER, "bind() failed");
 560
 561   listen(lfd, 5);
 562 #endif
 563
 564 #if !defined(TARGET_SDL)
 565   if (is_daemon)
 566   {
 567     /* become a daemon, breaking all ties with the controlling terminal */
 568     options.verbose = FALSE;
 569     for (i = 0; i < 255; i++)
 570     {
 571       if (i != lfd)
 572         close(i);
 573     }
 574
 575     if (fork())
 576       exit(0);
 577     setsid();
 578     if (fork())
 579       exit(0);
 580     chdir("/");
 581
 582     /* open a fake stdin, stdout, stderr, just in case */
 583     open("/dev/null", O_RDONLY);
 584     open("/dev/null", O_WRONLY);
 585     open("/dev/null", O_WRONLY);
 586   }
 587 #endif
 588
 589   if (options.verbose)
 590   {
 591     Error(ERR_NETWORK_SERVER, "started up, listening on port %d", port);
 592     Error(ERR_NETWORK_SERVER, "using protocol version %d.%d.%d",
 593           PROTOCOL_VERSION_1, PROTOCOL_VERSION_2, PROTOCOL_VERSION_3);
 594   }
 595
 596   while (1)
 597   {
 598     interrupt = 0;
 599
 600     for (player = first_player; player; player = player->next)
 601       flushuser(player);
 602
 603 #if defined(TARGET_SDL)
 604     if ((sl = SDLNet_CheckSockets(fds, 500000)) < 1)
 605     {
 606       Error(ERR_NETWORK_SERVER, SDLNet_GetError());
 607       perror("SDLNet_CheckSockets");
 608     }
 609
 610 #else
 611
 612     FD_ZERO(&fds);
 613     mfd = lfd;
 614     player = first_player;
 615     while (player)
 616     {
 617       FD_SET(player->fd, &fds);
 618       if (player->fd > mfd)
 619         mfd = player->fd;
 620       player = player->next;
 621     }
 622     FD_SET(lfd, &fds);
 623     tv.tv_sec = 0;
 624     tv.tv_usec = 500000;
 625     if ((sl = select(mfd + 1, &fds, NULL, NULL, &tv)) < 0)
 626     {
 627       if (errno != EINTR)
 628         Error(ERR_EXIT_NETWORK_SERVER, "select() failed");
 629       else
 630         continue;
 631     }
 632 #endif
 633
 634     if (sl < 0)
 635       continue;
 636
 637     if (sl == 0)
 638       continue;
 639
 640     /* accept incoming connections */
 641 #if defined(TARGET_SDL)
 642     if (SDLNet_SocketReady(lfd))
 643     {
 644       TCPsocket newsock;
 645
 646       newsock = SDLNet_TCP_Accept(lfd);
 647
 648       if (newsock)
 649         AddPlayer(newsock);
 650     }
 651
 652 #else
 653
 654     if (FD_ISSET(lfd, &fds))
 655     {
 656       int newfd, slen;
 657
 658       slen = sizeof(saddr);
 659       newfd = accept(lfd, (struct sockaddr *)&saddr, &slen);
 660       if (newfd < 0)
 661       {
 662         if (errno != EINTR)
 663           Error(ERR_EXIT_NETWORK_SERVER, "accept() failed");
 664       }
 665       else
 666       {
 667         if (tcp != -1)
 668         {
 669           on = 1;
 670           setsockopt(newfd, tcp, TCP_NODELAY, (char *)&on, sizeof(int));
 671         }
 672         AddPlayer(newfd);
 673       }
 674       continue;
 675     }
 676 #endif
 677
 678     player = first_player;
 679
 680     do
 681     {
 682 #if defined(TARGET_SDL)
 683       if (SDLNet_SocketReady(player->fd))
 684 #else
 685       if (FD_ISSET(player->fd, &fds))
 686 #endif
 687       {
 688 #if defined(TARGET_SDL)
 689         /* read only 1 byte, because SDLNet blocks when we want more than is
 690            in the buffer */
 691         r = SDLNet_TCP_Recv(player->fd, player->readbuffer + player->nread, 1);
 692 #else
 693         r = read(player->fd, player->readbuffer + player->nread,
 694                  MAX_BUFFER_SIZE - player->nread);
 695 #endif
 696
 697         if (r <= 0)
 698         {
 699           if (options.verbose)
 700             Error(ERR_NETWORK_SERVER, "EOF from client %d (%s)",
 701                   player->number, player->player_name);
 702           RemovePlayer(player);
 703           interrupt = 1;
 704           break;
 705         }
 706         player->nread += r;
 707         while (player->nread >= 4 && player->nread >= 4 + player->readbuffer[3])
 708         {
 709           len = player->readbuffer[3];
 710           if (player->readbuffer[0] || player->readbuffer[1] || player->readbuffer[2])
 711           {
 712             if (options.verbose)
 713               Error(ERR_NETWORK_SERVER, "crap from client %d (%s)",
 714                     player->number, player->player_name);
 715             RemovePlayer(player);
 716             interrupt = 1;
 717             break;
 718           }
 719           memcpy(buffer, &player->readbuffer[4], len);
 720           player->nread -= 4 + len;
 721           memmove(player->readbuffer, player->readbuffer + 4 + len, player->nread);
 722
 723           buffer[0] = player->number;
 724           if (!player->introduced && buffer[1] != OP_PLAYER_NAME)
 725           {
 726             if (options.verbose)
 727               Error(ERR_NETWORK_SERVER, "!(client %d)->introduced && buffer[1]==%d (expected OP_PLAYER_NAME)", buffer[0], buffer[1]);
 728
 729             RemovePlayer(player);
 730             interrupt = 1;
 731             break;
 732           }
 733
 734           switch(buffer[1])
 735           {
 736             case OP_PLAYER_NAME:
 737               Handle_OP_PLAYER_NAME(player, len);
 738               break;
 739
 740             case OP_PROTOCOL_VERSION:
 741               Handle_OP_PROTOCOL_VERSION(player, len);
 742               break;
 743
 744             case OP_NUMBER_WANTED:
 745               Handle_OP_NUMBER_WANTED(player);
 746               break;
 747
 748             case OP_START_PLAYING:
 749               Handle_OP_START_PLAYING(player);
 750               break;
 751
 752             case OP_PAUSE_PLAYING:
 753               Handle_OP_PAUSE_PLAYING(player);
 754               break;
 755
 756             case OP_CONTINUE_PLAYING:
 757               Handle_OP_CONTINUE_PLAYING(player);
 758               break;
 759
 760             case OP_STOP_PLAYING:
 761               Handle_OP_STOP_PLAYING(player);
 762               break;
 763
 764             case OP_MOVE_PLAYER:
 765               Handle_OP_MOVE_PLAYER(player);
 766               break;
 767
 768             case OP_BROADCAST_MESSAGE:
 769               buffer[len] = '\0';
 770               if (options.verbose)
 771                 Error(ERR_NETWORK_SERVER, "client %d (%s) sends message: %s",
 772                       player->number, player->player_name, &buffer[2]);
 773               broadcast(player, len, 0);
 774               break;
 775
 776             default:
 777               if (options.verbose)
 778                 Error(ERR_NETWORK_SERVER,
 779                       "unknown opcode %d from client %d (%s)",
 780                       buffer[0], player->number, player->player_name);
 781           }
 782         }
 783       }
 784
 785       if (player && !interrupt)
 786         player = player->next;
 787     }
 788     while (player && !interrupt);
 789   }
 790 }
 791
 792 #endif /* NETWORK_AVALIABLE */