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 #if 1
 207   while (again)
 208   {
 209     again = FALSE;
 210     v = player->next;
 211
 212     while (v)
 213     {
 214       if (v->number == nxn)
 215       {
 216         nxn++;
 217
 218         again = TRUE;
 219         break;
 220       }
 221       v = v->next;
 222     }
 223   }
 224 #else
 225  again:
 226   v = player->next;
 227   while (v)
 228   {
 229     if (v->number == nxn)
 230     {
 231       nxn++;
 232       goto again;
 233     }
 234     v = v->next;
 235   }
 236 #endif
 237
 238   player->number = nxn;
 239 #if !defined(TARGET_SDL)
 240   if (options.verbose)
 241     Error(ERR_NETWORK_SERVER, "client %d connecting from %s",
 242           nxn, inet_ntoa(saddr.sin_addr));
 243 #endif
 244   clients++;
 245
 246   buffer[0] = 0;
 247   buffer[1] = OP_YOUR_NUMBER;
 248   buffer[2] = player->number;
 249   sendtoone(player, 3);
 250 }
 251
 252 static void Handle_OP_PROTOCOL_VERSION(struct NetworkServerPlayerInfo *player,
 253                                        unsigned int len)
 254 {
 255   if (len != 5 ||
 256       buffer[2] != PROTOCOL_VERSION_1 ||
 257       buffer[3] != PROTOCOL_VERSION_2)
 258   {
 259     if (options.verbose)
 260       Error(ERR_NETWORK_SERVER,
 261             "client %d (%s) has wrong protocol version %d.%d.%d",
 262             player->number, player->player_name, buffer[2], buffer[3], buffer[4]);
 263
 264     buffer[0] = 0;
 265     buffer[1] = OP_BAD_PROTOCOL_VERSION;
 266     buffer[2] = PROTOCOL_VERSION_1;
 267     buffer[3] = PROTOCOL_VERSION_2;
 268     buffer[4] = PROTOCOL_VERSION_3;
 269     sendtoone(player, 5);
 270     flushuser(player);
 271
 272     RemovePlayer(player);
 273     interrupt = 1;
 274   }
 275   else
 276   {
 277     if (options.verbose)
 278       Error(ERR_NETWORK_SERVER,
 279             "client %d (%s) uses protocol version %d.%d.%d",
 280             player->number, player->player_name, buffer[2], buffer[3], buffer[4]);
 281   }
 282 }
 283
 284 static void Handle_OP_NUMBER_WANTED(struct NetworkServerPlayerInfo *player)
 285 {
 286   struct NetworkServerPlayerInfo *v;
 287   int client_nr = player->number;
 288   int nr_wanted = buffer[2];
 289   int nr_is_free = 1;
 290
 291   if (options.verbose)
 292       Error(ERR_NETWORK_SERVER, "client %d (%s) wants to switch to # %d",
 293             player->number, player->player_name, nr_wanted);
 294
 295   for (v = first_player; v; v = v->next)
 296   {
 297     if (v->number == nr_wanted)
 298     {
 299       nr_is_free = 0;
 300       break;
 301     }
 302   }
 303
 304   if (options.verbose)
 305   {
 306     if (nr_is_free)
 307       Error(ERR_NETWORK_SERVER, "client %d (%s) switches to # %d",
 308             player->number, player->player_name, nr_wanted);
 309     else if (player->number == nr_wanted)
 310       Error(ERR_NETWORK_SERVER, "client %d (%s) still has # %d",
 311             player->number, player->player_name, nr_wanted);
 312     else
 313       Error(ERR_NETWORK_SERVER,
 314             "client %d (%s) cannot switch (client %d still exists)",
 315             player->number, player->player_name, nr_wanted);
 316   }
 317
 318   if (nr_is_free)
 319     player->number = nr_wanted;
 320
 321   buffer[0] = client_nr;
 322   buffer[1] = OP_NUMBER_WANTED;
 323   buffer[2] = nr_wanted;
 324   buffer[3] = player->number;
 325
 326   /*
 327   sendtoone(player, 4);
 328   */
 329
 330   broadcast(NULL, 4, 0);
 331 }
 332
 333 static void Handle_OP_PLAYER_NAME(struct NetworkServerPlayerInfo *player,
 334                                   unsigned int len)
 335 {
 336   struct NetworkServerPlayerInfo *v;
 337   int i;
 338
 339   if (len>16)
 340     len=16;
 341   memcpy(player->player_name, &buffer[2], len-2);
 342   player->player_name[len-2] = 0;
 343   for (i = 0; i < len - 2; i++)
 344   {
 345     if (player->player_name[i] < ' ' ||
 346         ((unsigned char)(player->player_name[i]) > 0x7e &&
 347          (unsigned char)(player->player_name[i]) <= 0xa0))
 348     {
 349       player->player_name[i] = 0;
 350       break;
 351     }
 352   }
 353
 354   if (!player->introduced)
 355   {
 356     buffer[0] = player->number;
 357     buffer[1] = OP_PLAYER_CONNECTED;
 358     broadcast(player, 2, 0);
 359   }
 360
 361   if (options.verbose)
 362     Error(ERR_NETWORK_SERVER, "client %d calls itself \"%s\"",
 363           player->number, player->player_name);
 364   buffer[1] = OP_PLAYER_NAME;
 365   broadcast(player, len, 0);
 366
 367   if (!player->introduced)
 368   {
 369     for (v = first_player; v; v = v->next)
 370     {
 371       if (v != player && v->introduced)
 372       {
 373         buffer[0] = v->number;
 374         buffer[1] = OP_PLAYER_CONNECTED;
 375         sendtoone(player, 2);
 376         buffer[1] = OP_PLAYER_NAME;
 377         memcpy(&buffer[2], v->player_name, 14);
 378         sendtoone(player, 2+strlen(v->player_name));
 379       }
 380     }
 381   }
 382
 383   player->introduced = 1;
 384 }
 385
 386 static void Handle_OP_START_PLAYING(struct NetworkServerPlayerInfo *player)
 387 {
 388   struct NetworkServerPlayerInfo *v, *w;
 389
 390   if (options.verbose)
 391     Error(ERR_NETWORK_SERVER,
 392           "client %d (%s) starts game [level %d from levedir %d (%s)]",
 393           player->number, player->player_name,
 394           (buffer[2] << 8) + buffer[3],
 395           (buffer[4] << 8) + buffer[5],
 396           &buffer[6]);
 397
 398   for (w = first_player; w; w = w->next)
 399     if (w->introduced)
 400       w->active = 1;
 401
 402   /* reset frame counter */
 403   ServerFrameCounter = 0;
 404
 405   /* reset player actions */
 406   for (v = first_player; v; v = v->next)
 407   {
 408     v->action = 0;
 409     v->action_received = FALSE;
 410   }
 411
 412   broadcast(NULL, 10 + strlen((char *)&buffer[10])+1, 0);
 413 }
 414
 415 static void Handle_OP_PAUSE_PLAYING(struct NetworkServerPlayerInfo *player)
 416 {
 417   if (options.verbose)
 418     Error(ERR_NETWORK_SERVER, "client %d (%s) pauses game",
 419           player->number, player->player_name);
 420   broadcast(NULL, 2, 0);
 421 }
 422
 423 static void Handle_OP_CONTINUE_PLAYING(struct NetworkServerPlayerInfo *player)
 424 {
 425   if (options.verbose)
 426     Error(ERR_NETWORK_SERVER, "client %d (%s) continues game",
 427           player->number, player->player_name);
 428   broadcast(NULL, 2, 0);
 429 }
 430
 431 static void Handle_OP_STOP_PLAYING(struct NetworkServerPlayerInfo *player)
 432 {
 433   if (options.verbose)
 434     Error(ERR_NETWORK_SERVER, "client %d (%s) stops game",
 435           player->number, player->player_name);
 436   broadcast(NULL, 2, 0);
 437 }
 438
 439 static void Handle_OP_MOVE_PLAYER(struct NetworkServerPlayerInfo *player)
 440 {
 441   struct NetworkServerPlayerInfo *v;
 442   int last_client_nr = 0;
 443   int i;
 444
 445   /* store player action */
 446   for (v = first_player; v; v = v->next)
 447   {
 448     if (v->number == player->number)
 449     {
 450       v->action = buffer[2];
 451       v->action_received = TRUE;
 452     }
 453   }
 454
 455   /* check if server received action from each player */
 456   for (v = first_player; v; v = v->next)
 457   {
 458     if (!v->action_received)
 459       return;
 460
 461     if (v->number > last_client_nr)
 462       last_client_nr = v->number;
 463   }
 464
 465   /* initialize all player actions to zero */
 466   for (i = 0; i < last_client_nr; i++)
 467     buffer[6 + i] = 0;
 468
 469   /* broadcast actions of all players to all players */
 470   for (v = first_player; v; v = v->next)
 471   {
 472     buffer[6 + v->number-1] = v->action;
 473     v->action = 0;
 474     v->action_received = FALSE;
 475   }
 476
 477   buffer[2] = (unsigned char)((ServerFrameCounter >> 24) & 0xff);
 478   buffer[3] = (unsigned char)((ServerFrameCounter >> 16) & 0xff);
 479   buffer[4] = (unsigned char)((ServerFrameCounter >>  8) & 0xff);
 480   buffer[5] = (unsigned char)((ServerFrameCounter >>  0) & 0xff);
 481
 482   broadcast(NULL, 6 + last_client_nr, 0);
 483
 484   ServerFrameCounter++;
 485 }
 486
 487 #if defined(TARGET_SDL)
 488 /* the following is not used for a standalone server;
 489    the pointer points to an integer containing the port-number */
 490 int NetworkServerThread(void *ptr)
 491 {
 492   NetworkServer(*((int *) ptr), 0);
 493
 494   /* should never be reached */
 495   return 0;
 496 }
 497 #endif
 498
 499 void NetworkServer(int port, int serveronly)
 500 {
 501   int sl;
 502   struct NetworkServerPlayerInfo *player;
 503   int r;
 504   unsigned int len;
 505 #if defined(TARGET_SDL)
 506   IPaddress ip;
 507 #else
 508   int i, on;
 509   int is_daemon = 0;
 510   struct protoent *tcpproto;
 511   struct timeval tv;
 512   int mfd;
 513 #endif
 514
 515 #if defined(PLATFORM_UNIX) && !defined(PLATFORM_NEXT)
 516   struct sigaction sact;
 517 #endif
 518
 519   if (port == 0)
 520     port = DEFAULT_SERVER_PORT;
 521
 522   if (!serveronly)
 523     onceonly = 1;
 524
 525 #if !defined(TARGET_SDL)
 526   if ((tcpproto = getprotobyname("tcp")) != NULL)
 527     tcp = tcpproto->p_proto;
 528 #endif
 529
 530 #if defined(PLATFORM_UNIX)
 531 #if defined(PLATFORM_NEXT)
 532   signal(SIGPIPE, SIG_IGN);
 533 #else
 534   sact.sa_handler = SIG_IGN;
 535   sigemptyset(&sact.sa_mask);
 536   sact.sa_flags = 0;
 537   sigaction(SIGPIPE, &sact, NULL);
 538 #endif
 539 #endif
 540
 541 #if defined(TARGET_SDL)
 542
 543   /* assume that SDL is already initialized */
 544 #if 0
 545   if (SDLNet_Init() == -1)
 546     Error(ERR_EXIT_NETWORK_SERVER, "SDLNet_Init() failed");
 547   atexit(SDLNet_Quit);
 548 #endif
 549
 550   if (SDLNet_ResolveHost(&ip, NULL, port) == -1)
 551     Error(ERR_EXIT_NETWORK_SERVER, "SDLNet_ResolveHost() failed");
 552
 553   lfd = SDLNet_TCP_Open(&ip);
 554   if (!lfd)
 555     Error(ERR_EXIT_NETWORK_SERVER, "SDLNet_TCP_Open() failed");
 556
 557   fds = SDLNet_AllocSocketSet(MAX_PLAYERS+1);
 558   SDLNet_TCP_AddSocket(fds, lfd);
 559
 560 #else
 561
 562   if ((lfd = socket(PF_INET, SOCK_STREAM, 0)) < 0)
 563     Error(ERR_EXIT_NETWORK_SERVER, "socket() failed");
 564
 565   saddr.sin_family = AF_INET;
 566   saddr.sin_addr.s_addr = htonl(INADDR_ANY);
 567   saddr.sin_port = htons(port);
 568
 569   on = 1;
 570
 571   setsockopt(lfd, SOL_SOCKET, SO_REUSEADDR, (char *)&on, sizeof(int));
 572   if (bind(lfd, (struct sockaddr *)&saddr, sizeof(saddr)) < 0)
 573     Error(ERR_EXIT_NETWORK_SERVER, "bind() failed");
 574
 575   listen(lfd, 5);
 576 #endif
 577
 578 #if !defined(TARGET_SDL)
 579   if (is_daemon)
 580   {
 581     /* become a daemon, breaking all ties with the controlling terminal */
 582     options.verbose = FALSE;
 583     for (i = 0; i < 255; i++)
 584     {
 585       if (i != lfd)
 586         close(i);
 587     }
 588
 589     if (fork())
 590       exit(0);
 591     setsid();
 592     if (fork())
 593       exit(0);
 594     chdir("/");
 595
 596     /* open a fake stdin, stdout, stderr, just in case */
 597     open("/dev/null", O_RDONLY);
 598     open("/dev/null", O_WRONLY);
 599     open("/dev/null", O_WRONLY);
 600   }
 601 #endif
 602
 603   if (options.verbose)
 604   {
 605     Error(ERR_NETWORK_SERVER, "started up, listening on port %d", port);
 606     Error(ERR_NETWORK_SERVER, "using protocol version %d.%d.%d",
 607           PROTOCOL_VERSION_1, PROTOCOL_VERSION_2, PROTOCOL_VERSION_3);
 608   }
 609
 610   while (1)
 611   {
 612     interrupt = 0;
 613
 614     for (player = first_player; player; player = player->next)
 615       flushuser(player);
 616
 617 #if defined(TARGET_SDL)
 618     if ((sl = SDLNet_CheckSockets(fds, 500000)) < 1)
 619     {
 620       Error(ERR_NETWORK_SERVER, SDLNet_GetError());
 621       perror("SDLNet_CheckSockets");
 622     }
 623
 624 #else
 625
 626     FD_ZERO(&fds);
 627     mfd = lfd;
 628     player = first_player;
 629     while (player)
 630     {
 631       FD_SET(player->fd, &fds);
 632       if (player->fd > mfd)
 633         mfd = player->fd;
 634       player = player->next;
 635     }
 636     FD_SET(lfd, &fds);
 637     tv.tv_sec = 0;
 638     tv.tv_usec = 500000;
 639     if ((sl = select(mfd + 1, &fds, NULL, NULL, &tv)) < 0)
 640     {
 641       if (errno != EINTR)
 642         Error(ERR_EXIT_NETWORK_SERVER, "select() failed");
 643       else
 644         continue;
 645     }
 646 #endif
 647
 648     if (sl < 0)
 649       continue;
 650
 651     if (sl == 0)
 652       continue;
 653
 654     /* accept incoming connections */
 655 #if defined(TARGET_SDL)
 656     if (SDLNet_SocketReady(lfd))
 657     {
 658       TCPsocket newsock;
 659
 660       newsock = SDLNet_TCP_Accept(lfd);
 661
 662       if (newsock)
 663         AddPlayer(newsock);
 664     }
 665
 666 #else
 667
 668     if (FD_ISSET(lfd, &fds))
 669     {
 670       int newfd, slen;
 671
 672       slen = sizeof(saddr);
 673       newfd = accept(lfd, (struct sockaddr *)&saddr, &slen);
 674       if (newfd < 0)
 675       {
 676         if (errno != EINTR)
 677           Error(ERR_EXIT_NETWORK_SERVER, "accept() failed");
 678       }
 679       else
 680       {
 681         if (tcp != -1)
 682         {
 683           on = 1;
 684           setsockopt(newfd, tcp, TCP_NODELAY, (char *)&on, sizeof(int));
 685         }
 686         AddPlayer(newfd);
 687       }
 688       continue;
 689     }
 690 #endif
 691
 692     player = first_player;
 693
 694     do
 695     {
 696 #if defined(TARGET_SDL)
 697       if (SDLNet_SocketReady(player->fd))
 698 #else
 699       if (FD_ISSET(player->fd, &fds))
 700 #endif
 701       {
 702 #if defined(TARGET_SDL)
 703         /* read only 1 byte, because SDLNet blocks when we want more than is
 704            in the buffer */
 705         r = SDLNet_TCP_Recv(player->fd, player->readbuffer + player->nread, 1);
 706 #else
 707         r = read(player->fd, player->readbuffer + player->nread,
 708                  MAX_BUFFER_SIZE - player->nread);
 709 #endif
 710
 711         if (r <= 0)
 712         {
 713           if (options.verbose)
 714             Error(ERR_NETWORK_SERVER, "EOF from client %d (%s)",
 715                   player->number, player->player_name);
 716           RemovePlayer(player);
 717           interrupt = 1;
 718           break;
 719         }
 720         player->nread += r;
 721         while (player->nread >= 4 && player->nread >= 4 + player->readbuffer[3])
 722         {
 723           len = player->readbuffer[3];
 724           if (player->readbuffer[0] || player->readbuffer[1] || player->readbuffer[2])
 725           {
 726             if (options.verbose)
 727               Error(ERR_NETWORK_SERVER, "crap from client %d (%s)",
 728                     player->number, player->player_name);
 729             RemovePlayer(player);
 730             interrupt = 1;
 731             break;
 732           }
 733           memcpy(buffer, &player->readbuffer[4], len);
 734           player->nread -= 4 + len;
 735           memmove(player->readbuffer, player->readbuffer + 4 + len, player->nread);
 736
 737           buffer[0] = player->number;
 738           if (!player->introduced && buffer[1] != OP_PLAYER_NAME)
 739           {
 740             if (options.verbose)
 741               Error(ERR_NETWORK_SERVER, "!(client %d)->introduced && buffer[1]==%d (expected OP_PLAYER_NAME)", buffer[0], buffer[1]);
 742
 743             RemovePlayer(player);
 744             interrupt = 1;
 745             break;
 746           }
 747
 748           switch(buffer[1])
 749           {
 750             case OP_PLAYER_NAME:
 751               Handle_OP_PLAYER_NAME(player, len);
 752               break;
 753
 754             case OP_PROTOCOL_VERSION:
 755               Handle_OP_PROTOCOL_VERSION(player, len);
 756               break;
 757
 758             case OP_NUMBER_WANTED:
 759               Handle_OP_NUMBER_WANTED(player);
 760               break;
 761
 762             case OP_START_PLAYING:
 763               Handle_OP_START_PLAYING(player);
 764               break;
 765
 766             case OP_PAUSE_PLAYING:
 767               Handle_OP_PAUSE_PLAYING(player);
 768               break;
 769
 770             case OP_CONTINUE_PLAYING:
 771               Handle_OP_CONTINUE_PLAYING(player);
 772               break;
 773
 774             case OP_STOP_PLAYING:
 775               Handle_OP_STOP_PLAYING(player);
 776               break;
 777
 778             case OP_MOVE_PLAYER:
 779               Handle_OP_MOVE_PLAYER(player);
 780               break;
 781
 782             case OP_BROADCAST_MESSAGE:
 783               buffer[len] = '\0';
 784               if (options.verbose)
 785                 Error(ERR_NETWORK_SERVER, "client %d (%s) sends message: %s",
 786                       player->number, player->player_name, &buffer[2]);
 787               broadcast(player, len, 0);
 788               break;
 789
 790             default:
 791               if (options.verbose)
 792                 Error(ERR_NETWORK_SERVER,
 793                       "unknown opcode %d from client %d (%s)",
 794                       buffer[0], player->number, player->player_name);
 795           }
 796         }
 797       }
 798
 799       if (player && !interrupt)
 800         player = player->next;
 801     }
 802     while (player && !interrupt);
 803   }
 804 }
 805
 806 #endif /* NETWORK_AVALIABLE */