src/netserv.c

   1 /***********************************************************
   2 * Rocks'n'Diamonds -- McDuffin Strikes Back!               *
   3 *----------------------------------------------------------*
   4 * (c) 1995-2006 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 int 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     if (write(player->fd, player->writbuffer, player->nwrite) == -1)
 101       Error(ERR_WARN, "write() failed; %s", strerror(errno));
 102 #endif
 103     player->nwrite = 0;
 104   }
 105 }
 106
 107 static void broadcast(struct NetworkServerPlayerInfo *except,
 108                       int len, int activeonly)
 109 {
 110   struct NetworkServerPlayerInfo *player;
 111
 112   realbuffer[0] = realbuffer[1] = realbuffer[2] = 0;
 113   realbuffer[3] = (unsigned char)len;
 114   for (player = first_player; player; player = player->next)
 115     if (player != except && player->introduced &&
 116         (player->active || !activeonly))
 117       addtobuffer(player, realbuffer, 4 + len);
 118 }
 119
 120 static void sendtoone(struct NetworkServerPlayerInfo *to, int len)
 121 {
 122   realbuffer[0] = realbuffer[1] = realbuffer[2] = 0;
 123   realbuffer[3] = (unsigned char)len;
 124   addtobuffer(to, realbuffer, 4 + len);
 125 }
 126
 127 static void RemovePlayer(struct NetworkServerPlayerInfo *player)
 128 {
 129   struct NetworkServerPlayerInfo *v;
 130
 131   if (options.verbose)
 132     Error(ERR_NETWORK_SERVER, "dropping client %d (%s)",
 133           player->number, player->player_name);
 134
 135   if (player == first_player)
 136     first_player = player->next;
 137   else
 138   {
 139     for (v = first_player; v; v = v->next)
 140     {
 141       if (v->next && v->next == player)
 142       {
 143         v->next = player->next;
 144         break;
 145       }
 146     }
 147   }
 148
 149 #if defined(TARGET_SDL)
 150   SDLNet_TCP_DelSocket(fds, player->fd);
 151   SDLNet_TCP_Close(player->fd);
 152 #else
 153   close(player->fd);
 154 #endif
 155
 156   if (player->introduced)
 157   {
 158     buffer[0] = player->number;
 159     buffer[1] = OP_PLAYER_DISCONNECTED;
 160     broadcast(player, 2, 0);
 161   }
 162
 163   free(player);
 164   clients--;
 165
 166   if (onceonly && clients == 0)
 167   {
 168     if (options.verbose)
 169     {
 170       Error(ERR_NETWORK_SERVER, "no clients left");
 171       Error(ERR_NETWORK_SERVER, "aborting");
 172     }
 173     exit(0);
 174   }
 175 }
 176
 177 #if defined(TARGET_SDL)
 178 static void AddPlayer(TCPsocket fd)
 179 #else
 180 static void AddPlayer(int fd)
 181 #endif
 182 {
 183   struct NetworkServerPlayerInfo *player, *v;
 184   unsigned char nxn;
 185   boolean again = TRUE;
 186
 187   player = checked_malloc(sizeof (struct NetworkServerPlayerInfo));
 188
 189   player->fd = fd;
 190   player->player_name[0] = 0;
 191   player->next = first_player;
 192   player->active = 0;
 193   player->nread = 0;
 194   player->nwrite = 0;
 195   player->introduced = 0;
 196   player->action = 0;
 197   player->action_received = FALSE;
 198
 199 #if defined(TARGET_SDL)
 200   SDLNet_TCP_AddSocket(fds, fd);
 201 #endif
 202
 203   first_player = player;
 204
 205   nxn = 1;
 206
 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
 225   player->number = nxn;
 226 #if !defined(TARGET_SDL)
 227   if (options.verbose)
 228     Error(ERR_NETWORK_SERVER, "client %d connecting from %s",
 229           nxn, inet_ntoa(saddr.sin_addr));
 230 #endif
 231   clients++;
 232
 233   buffer[0] = 0;
 234   buffer[1] = OP_YOUR_NUMBER;
 235   buffer[2] = player->number;
 236   sendtoone(player, 3);
 237 }
 238
 239 static void Handle_OP_PROTOCOL_VERSION(struct NetworkServerPlayerInfo *player,
 240                                        unsigned int len)
 241 {
 242   if (len != 5 ||
 243       buffer[2] != PROTOCOL_VERSION_1 ||
 244       buffer[3] != PROTOCOL_VERSION_2)
 245   {
 246     if (options.verbose)
 247       Error(ERR_NETWORK_SERVER,
 248             "client %d (%s) has wrong protocol version %d.%d.%d",
 249             player->number, player->player_name, buffer[2], buffer[3], buffer[4]);
 250
 251     buffer[0] = 0;
 252     buffer[1] = OP_BAD_PROTOCOL_VERSION;
 253     buffer[2] = PROTOCOL_VERSION_1;
 254     buffer[3] = PROTOCOL_VERSION_2;
 255     buffer[4] = PROTOCOL_VERSION_3;
 256     sendtoone(player, 5);
 257     flushuser(player);
 258
 259     RemovePlayer(player);
 260     interrupt = 1;
 261   }
 262   else
 263   {
 264     if (options.verbose)
 265       Error(ERR_NETWORK_SERVER,
 266             "client %d (%s) uses protocol version %d.%d.%d",
 267             player->number, player->player_name, buffer[2], buffer[3], buffer[4]);
 268   }
 269 }
 270
 271 static void Handle_OP_NUMBER_WANTED(struct NetworkServerPlayerInfo *player)
 272 {
 273   struct NetworkServerPlayerInfo *v;
 274   int client_nr = player->number;
 275   int nr_wanted = buffer[2];
 276   int nr_is_free = 1;
 277
 278   if (options.verbose)
 279       Error(ERR_NETWORK_SERVER, "client %d (%s) wants to switch to # %d",
 280             player->number, player->player_name, nr_wanted);
 281
 282   for (v = first_player; v; v = v->next)
 283   {
 284     if (v->number == nr_wanted)
 285     {
 286       nr_is_free = 0;
 287       break;
 288     }
 289   }
 290
 291   if (options.verbose)
 292   {
 293     if (nr_is_free)
 294       Error(ERR_NETWORK_SERVER, "client %d (%s) switches to # %d",
 295             player->number, player->player_name, nr_wanted);
 296     else if (player->number == nr_wanted)
 297       Error(ERR_NETWORK_SERVER, "client %d (%s) already has # %d",
 298             player->number, player->player_name, nr_wanted);
 299     else
 300       Error(ERR_NETWORK_SERVER,
 301             "client %d (%s) cannot switch (client %d already exists)",
 302             player->number, player->player_name, nr_wanted);
 303   }
 304
 305   if (nr_is_free)
 306     player->number = nr_wanted;
 307
 308   buffer[0] = client_nr;
 309   buffer[1] = OP_NUMBER_WANTED;
 310   buffer[2] = nr_wanted;
 311   buffer[3] = player->number;
 312
 313   /*
 314   sendtoone(player, 4);
 315   */
 316
 317   broadcast(NULL, 4, 0);
 318 }
 319
 320 static void Handle_OP_PLAYER_NAME(struct NetworkServerPlayerInfo *player,
 321                                   unsigned int len)
 322 {
 323   struct NetworkServerPlayerInfo *v;
 324   int i;
 325
 326   if (len>16)
 327     len=16;
 328   memcpy(player->player_name, &buffer[2], len-2);
 329   player->player_name[len-2] = 0;
 330   for (i = 0; i < len - 2; i++)
 331   {
 332     if (player->player_name[i] < ' ' ||
 333         ((unsigned char)(player->player_name[i]) > 0x7e &&
 334          (unsigned char)(player->player_name[i]) <= 0xa0))
 335     {
 336       player->player_name[i] = 0;
 337       break;
 338     }
 339   }
 340
 341   if (!player->introduced)
 342   {
 343     buffer[0] = player->number;
 344     buffer[1] = OP_PLAYER_CONNECTED;
 345     broadcast(player, 2, 0);
 346   }
 347
 348   if (options.verbose)
 349     Error(ERR_NETWORK_SERVER, "client %d calls itself \"%s\"",
 350           player->number, player->player_name);
 351   buffer[1] = OP_PLAYER_NAME;
 352   broadcast(player, len, 0);
 353
 354   if (!player->introduced)
 355   {
 356     for (v = first_player; v; v = v->next)
 357     {
 358       if (v != player && v->introduced)
 359       {
 360         buffer[0] = v->number;
 361         buffer[1] = OP_PLAYER_CONNECTED;
 362         sendtoone(player, 2);
 363         buffer[1] = OP_PLAYER_NAME;
 364         memcpy(&buffer[2], v->player_name, 14);
 365         sendtoone(player, 2+strlen(v->player_name));
 366       }
 367     }
 368   }
 369
 370   player->introduced = 1;
 371 }
 372
 373 static void Handle_OP_START_PLAYING(struct NetworkServerPlayerInfo *player)
 374 {
 375   struct NetworkServerPlayerInfo *v, *w;
 376
 377   if (options.verbose)
 378     Error(ERR_NETWORK_SERVER,
 379           "client %d (%s) starts game [level %d from leveldir %d (%s)]",
 380           player->number, player->player_name,
 381           (buffer[2] << 8) + buffer[3],
 382           (buffer[4] << 8) + buffer[5],
 383           &buffer[10]);
 384
 385   for (w = first_player; w; w = w->next)
 386     if (w->introduced)
 387       w->active = 1;
 388
 389   /* reset frame counter */
 390   ServerFrameCounter = 0;
 391
 392   Error(ERR_NETWORK_SERVER, "resetting ServerFrameCounter to 0");
 393
 394   /* reset player actions */
 395   for (v = first_player; v; v = v->next)
 396   {
 397     v->action = 0;
 398     v->action_received = FALSE;
 399   }
 400
 401   broadcast(NULL, 10 + strlen((char *)&buffer[10])+1, 0);
 402 }
 403
 404 static void Handle_OP_PAUSE_PLAYING(struct NetworkServerPlayerInfo *player)
 405 {
 406   if (options.verbose)
 407     Error(ERR_NETWORK_SERVER, "client %d (%s) pauses game",
 408           player->number, player->player_name);
 409   broadcast(NULL, 2, 0);
 410 }
 411
 412 static void Handle_OP_CONTINUE_PLAYING(struct NetworkServerPlayerInfo *player)
 413 {
 414   if (options.verbose)
 415     Error(ERR_NETWORK_SERVER, "client %d (%s) continues game",
 416           player->number, player->player_name);
 417   broadcast(NULL, 2, 0);
 418 }
 419
 420 static void Handle_OP_STOP_PLAYING(struct NetworkServerPlayerInfo *player)
 421 {
 422   int cause_for_stopping = buffer[2];
 423
 424   if (options.verbose)
 425     Error(ERR_NETWORK_SERVER, "client %d (%s) stops game [%d]",
 426           player->number, player->player_name, cause_for_stopping);
 427   broadcast(NULL, 3, 0);
 428 }
 429
 430 static void Handle_OP_MOVE_PLAYER(struct NetworkServerPlayerInfo *player)
 431 {
 432   struct NetworkServerPlayerInfo *v;
 433   int last_client_nr = 0;
 434   int i;
 435
 436   /* store player action */
 437   for (v = first_player; v; v = v->next)
 438   {
 439     if (v->number == player->number)
 440     {
 441       v->action = buffer[2];
 442       v->action_received = TRUE;
 443     }
 444   }
 445
 446   /* check if server received action from each player */
 447   for (v = first_player; v; v = v->next)
 448   {
 449     if (!v->action_received)
 450       return;
 451
 452     if (v->number > last_client_nr)
 453       last_client_nr = v->number;
 454   }
 455
 456   /* initialize all player actions to zero */
 457   for (i = 0; i < last_client_nr; i++)
 458     buffer[6 + i] = 0;
 459
 460   /* broadcast actions of all players to all players */
 461   for (v = first_player; v; v = v->next)
 462   {
 463     buffer[6 + v->number-1] = v->action;
 464     v->action = 0;
 465     v->action_received = FALSE;
 466   }
 467
 468   buffer[2] = (unsigned char)((ServerFrameCounter >> 24) & 0xff);
 469   buffer[3] = (unsigned char)((ServerFrameCounter >> 16) & 0xff);
 470   buffer[4] = (unsigned char)((ServerFrameCounter >>  8) & 0xff);
 471   buffer[5] = (unsigned char)((ServerFrameCounter >>  0) & 0xff);
 472
 473   broadcast(NULL, 6 + last_client_nr, 0);
 474
 475 #if 0
 476   Error(ERR_NETWORK_SERVER, "sending ServerFrameCounter value %d",
 477         ServerFrameCounter);
 478 #endif
 479
 480   ServerFrameCounter++;
 481 }
 482
 483 #if defined(TARGET_SDL)
 484 /* the following is not used for a standalone server;
 485    the pointer points to an integer containing the port-number */
 486 int NetworkServerThread(void *ptr)
 487 {
 488   NetworkServer(*((int *) ptr), 0);
 489
 490   /* should never be reached */
 491   return 0;
 492 }
 493 #endif
 494
 495 void NetworkServer(int port, int serveronly)
 496 {
 497   int sl;
 498   struct NetworkServerPlayerInfo *player;
 499   int r;
 500   unsigned int len;
 501 #if defined(TARGET_SDL)
 502   IPaddress ip;
 503 #else
 504   int i, on;
 505   int is_daemon = 0;
 506   struct protoent *tcpproto;
 507   struct timeval tv;
 508   int mfd;
 509 #endif
 510
 511 #if defined(PLATFORM_UNIX) && !defined(PLATFORM_NEXT)
 512   struct sigaction sact;
 513 #endif
 514
 515   if (port == 0)
 516     port = DEFAULT_SERVER_PORT;
 517
 518   if (!serveronly)
 519     onceonly = 1;
 520
 521 #if !defined(TARGET_SDL)
 522   if ((tcpproto = getprotobyname("tcp")) != NULL)
 523     tcp = tcpproto->p_proto;
 524 #endif
 525
 526 #if defined(PLATFORM_UNIX)
 527 #if defined(PLATFORM_NEXT)
 528   signal(SIGPIPE, SIG_IGN);
 529 #else
 530   sact.sa_handler = SIG_IGN;
 531   sigemptyset(&sact.sa_mask);
 532   sact.sa_flags = 0;
 533   sigaction(SIGPIPE, &sact, NULL);
 534 #endif
 535 #endif
 536
 537 #if defined(TARGET_SDL)
 538
 539   /* assume that SDL is already initialized */
 540 #if 0
 541   if (SDLNet_Init() == -1)
 542     Error(ERR_EXIT_NETWORK_SERVER, "SDLNet_Init() failed");
 543   atexit(SDLNet_Quit);
 544 #endif
 545
 546   if (SDLNet_ResolveHost(&ip, NULL, port) == -1)
 547     Error(ERR_EXIT_NETWORK_SERVER, "SDLNet_ResolveHost() failed");
 548
 549   lfd = SDLNet_TCP_Open(&ip);
 550   if (!lfd)
 551     Error(ERR_EXIT_NETWORK_SERVER, "SDLNet_TCP_Open() failed");
 552
 553   fds = SDLNet_AllocSocketSet(MAX_PLAYERS+1);
 554   SDLNet_TCP_AddSocket(fds, lfd);
 555
 556 #else
 557
 558   if ((lfd = socket(PF_INET, SOCK_STREAM, 0)) < 0)
 559     Error(ERR_EXIT_NETWORK_SERVER, "socket() failed");
 560
 561   saddr.sin_family = AF_INET;
 562   saddr.sin_addr.s_addr = htonl(INADDR_ANY);
 563   saddr.sin_port = htons(port);
 564
 565   on = 1;
 566
 567   setsockopt(lfd, SOL_SOCKET, SO_REUSEADDR, (char *)&on, sizeof(int));
 568   if (bind(lfd, (struct sockaddr *)&saddr, sizeof(saddr)) < 0)
 569     Error(ERR_EXIT_NETWORK_SERVER, "bind() failed");
 570
 571   listen(lfd, 5);
 572 #endif
 573
 574 #if !defined(TARGET_SDL)
 575   if (is_daemon)
 576   {
 577     /* become a daemon, breaking all ties with the controlling terminal */
 578     options.verbose = FALSE;
 579     for (i = 0; i < 255; i++)
 580     {
 581       if (i != lfd)
 582         close(i);
 583     }
 584
 585     if (fork())
 586       exit(0);
 587     setsid();
 588     if (fork())
 589       exit(0);
 590     if (chdir("/") == -1)
 591       Error(ERR_WARN, "chdir() failed; %s", strerror(errno));
 592
 593     /* open a fake stdin, stdout, stderr, just in case */
 594     open("/dev/null", O_RDONLY);
 595     open("/dev/null", O_WRONLY);
 596     open("/dev/null", O_WRONLY);
 597   }
 598 #endif
 599
 600   if (options.verbose)
 601   {
 602     Error(ERR_NETWORK_SERVER, "started up, listening on port %d", port);
 603     Error(ERR_NETWORK_SERVER, "using protocol version %d.%d.%d",
 604           PROTOCOL_VERSION_1, PROTOCOL_VERSION_2, PROTOCOL_VERSION_3);
 605   }
 606
 607   while (1)
 608   {
 609     interrupt = 0;
 610
 611     for (player = first_player; player; player = player->next)
 612       flushuser(player);
 613
 614 #if defined(TARGET_SDL)
 615     if ((sl = SDLNet_CheckSockets(fds, 500000)) < 1)
 616     {
 617       Error(ERR_NETWORK_SERVER, "SDLNet_CheckSockets failed: %s",
 618             SDLNet_GetError());
 619       perror("SDLNet_CheckSockets");
 620     }
 621
 622 #else
 623
 624     FD_ZERO(&fds);
 625     mfd = lfd;
 626     player = first_player;
 627     while (player)
 628     {
 629       FD_SET(player->fd, &fds);
 630       if (player->fd > mfd)
 631         mfd = player->fd;
 632       player = player->next;
 633     }
 634     FD_SET(lfd, &fds);
 635     tv.tv_sec = 0;
 636     tv.tv_usec = 500000;
 637     if ((sl = select(mfd + 1, &fds, NULL, NULL, &tv)) < 0)
 638     {
 639       if (errno != EINTR)
 640         Error(ERR_EXIT_NETWORK_SERVER, "select() failed");
 641       else
 642         continue;
 643     }
 644 #endif
 645
 646     if (sl < 0)
 647       continue;
 648
 649     if (sl == 0)
 650       continue;
 651
 652     /* accept incoming connections */
 653 #if defined(TARGET_SDL)
 654     if (SDLNet_SocketReady(lfd))
 655     {
 656       TCPsocket newsock;
 657
 658       newsock = SDLNet_TCP_Accept(lfd);
 659
 660       if (newsock)
 661         AddPlayer(newsock);
 662     }
 663
 664 #else
 665
 666     if (FD_ISSET(lfd, &fds))
 667     {
 668       int newfd;
 669       socklen_t slen;
 670
 671       slen = sizeof(saddr);
 672       newfd = accept(lfd, (struct sockaddr *)&saddr, &slen);
 673       if (newfd < 0)
 674       {
 675         if (errno != EINTR)
 676           Error(ERR_EXIT_NETWORK_SERVER, "accept() failed");
 677       }
 678       else
 679       {
 680         if (tcp != -1)
 681         {
 682           on = 1;
 683           setsockopt(newfd, tcp, TCP_NODELAY, (char *)&on, sizeof(int));
 684         }
 685         AddPlayer(newfd);
 686       }
 687       continue;
 688     }
 689 #endif
 690
 691     player = first_player;
 692
 693     do
 694     {
 695 #if defined(TARGET_SDL)
 696       if (SDLNet_SocketReady(player->fd))
 697 #else
 698       if (FD_ISSET(player->fd, &fds))
 699 #endif
 700       {
 701 #if defined(TARGET_SDL)
 702         /* read only 1 byte, because SDLNet blocks when we want more than is
 703            in the buffer */
 704         r = SDLNet_TCP_Recv(player->fd, player->readbuffer + player->nread, 1);
 705 #else
 706         r = read(player->fd, player->readbuffer + player->nread,
 707                  MAX_BUFFER_SIZE - player->nread);
 708 #endif
 709
 710         if (r <= 0)
 711         {
 712           if (options.verbose)
 713             Error(ERR_NETWORK_SERVER, "EOF from client %d (%s)",
 714                   player->number, player->player_name);
 715           RemovePlayer(player);
 716           interrupt = 1;
 717           break;
 718         }
 719         player->nread += r;
 720         while (player->nread >= 4 && player->nread >= 4 + player->readbuffer[3])
 721         {
 722           len = player->readbuffer[3];
 723           if (player->readbuffer[0] || player->readbuffer[1] || player->readbuffer[2])
 724           {
 725             if (options.verbose)
 726               Error(ERR_NETWORK_SERVER, "crap from client %d (%s)",
 727                     player->number, player->player_name);
 728             RemovePlayer(player);
 729             interrupt = 1;
 730             break;
 731           }
 732           memcpy(buffer, &player->readbuffer[4], len);
 733           player->nread -= 4 + len;
 734           memmove(player->readbuffer, player->readbuffer + 4 + len, player->nread);
 735
 736           buffer[0] = player->number;
 737           if (!player->introduced && buffer[1] != OP_PLAYER_NAME)
 738           {
 739             if (options.verbose)
 740               Error(ERR_NETWORK_SERVER, "!(client %d)->introduced && buffer[1]==%d (expected OP_PLAYER_NAME)", buffer[0], buffer[1]);
 741
 742             RemovePlayer(player);
 743             interrupt = 1;
 744             break;
 745           }
 746
 747           switch (buffer[1])
 748           {
 749             case OP_PLAYER_NAME:
 750               Handle_OP_PLAYER_NAME(player, len);
 751               break;
 752
 753             case OP_PROTOCOL_VERSION:
 754               Handle_OP_PROTOCOL_VERSION(player, len);
 755               break;
 756
 757             case OP_NUMBER_WANTED:
 758               Handle_OP_NUMBER_WANTED(player);
 759               break;
 760
 761             case OP_START_PLAYING:
 762               Handle_OP_START_PLAYING(player);
 763               break;
 764
 765             case OP_PAUSE_PLAYING:
 766               Handle_OP_PAUSE_PLAYING(player);
 767               break;
 768
 769             case OP_CONTINUE_PLAYING:
 770               Handle_OP_CONTINUE_PLAYING(player);
 771               break;
 772
 773             case OP_STOP_PLAYING:
 774               Handle_OP_STOP_PLAYING(player);
 775               break;
 776
 777             case OP_MOVE_PLAYER:
 778               Handle_OP_MOVE_PLAYER(player);
 779               break;
 780
 781             case OP_BROADCAST_MESSAGE:
 782               buffer[len] = '\0';
 783               if (options.verbose)
 784                 Error(ERR_NETWORK_SERVER, "client %d (%s) sends message: %s",
 785                       player->number, player->player_name, &buffer[2]);
 786               broadcast(player, len, 0);
 787               break;
 788
 789             default:
 790               if (options.verbose)
 791                 Error(ERR_NETWORK_SERVER,
 792                       "unknown opcode %d from client %d (%s)",
 793                       buffer[0], player->number, player->player_name);
 794           }
 795         }
 796       }
 797
 798       if (player && !interrupt)
 799         player = player->next;
 800     }
 801     while (player && !interrupt);
 802   }
 803 }
 804
 805 #endif /* NETWORK_AVALIABLE */