src/network/psnet.cpp

   1 /*
   2  * Copyright (C) Volition, Inc. 1999.  All rights reserved.
   3  *
   4  * All source code herein is the property of Volition, Inc. You may not sell
   5  * or otherwise commercially exploit the source or things you created based on
   6  * the source.
   7  */
   8
   9 /*
  10  * $Logfile: /Freespace2/code/Network/PsNet.cpp $
  11  * $Revision$
  12  * $Date$
  13  * $Author$
  14  *
  15  * C file containing application level network-interface.
  16  *
  17  * $Log$
  18  * Revision 1.5  2002/06/09 04:41:24  relnev
  19  * added copyright header
  20  *
  21  * Revision 1.4  2002/06/02 02:29:39  relnev
  22  * net fixes
  23  *
  24  * Revision 1.3  2002/05/26 20:49:54  theoddone33
  25  * More progress
  26  *
  27  * Revision 1.2  2002/05/07 03:16:48  theoddone33
  28  * The Great Newline Fix
  29  *
  30  * Revision 1.1.1.1  2002/05/03 03:28:10  root
  31  * Initial import.
  32  *
  33  *
  34  * 7     7/15/99 9:20a Andsager
  35  * FS2_DEMO initial checkin
  36  *
  37  * 6     11/19/98 4:19p Dave
  38  * Put IPX sockets back in psnet. Consolidated all multiplayer config
  39  * files into one.
  40  *
  41  * 5     11/19/98 8:04a Dave
  42  * Full support for D3-style reliable sockets. Revamped packet lag/loss
  43  * system, made it receiver side and at the lowest possible level.
  44  *
  45  * 4     11/17/98 11:12a Dave
  46  * Removed player identification by address. Now assign explicit id #'s.
  47  *
  48  * 3     10/09/98 2:57p Dave
  49  * Starting splitting up OS stuff.
  50  *
  51  * 2     10/07/98 10:53a Dave
  52  * Initial checkin.
  53  *
  54  * 1     10/07/98 10:50a Dave
  55  *
  56  * 107   9/15/98 4:04p Allender
  57  * added back in the -ip_addr command line switch because it needs to be
  58  * in the standalone server only executable
  59  *
  60  * 106   9/14/98 11:28a Allender
  61  * support for server bashing of address when received from client.  Added
  62  * a cmdline.cfg file to process command line arguments from a file
  63  *
  64  * 105   9/08/98 2:20p Allender
  65  * temporary code to force IP address to a specific value.
  66  *
  67  * 104   8/21/98 1:15p Dave
  68  * Put in log system hooks in useful places.
  69  *
  70  * 103   8/12/98 4:50p Allender
  71  * fix error with new write socket code
  72  *
  73  * 102   8/11/98 11:45a Allender
  74  * fix major problem in psnet_send where select() would block until ready
  75  * to send, which for slow modems could be a long time.  Doesn't block,
  76  * and now correctly returns when socket is not set for writing
  77  *
  78  * 101   8/07/98 10:40a Allender
  79  * new command line flags for starting netgames.  Only starting currently
  80  * works, and PXO isn't implemented yet
  81  *
  82  * 100   7/28/98 4:43p Allender
  83  * fix bug where error on receiving of reliable data would sometimes
  84  * infinate loop
  85  *
  86  * 99    7/06/98 5:05p Allender
  87  * dont use default port to send UDP data to.  Use port stored in address
  88  *
  89  * 98    6/13/98 9:32p Mike
  90  * Kill last character in file which caused "Find in Files" to report the
  91  * file as "not a text file."
  92  *
  93  * 97    6/13/98 6:01p Hoffoss
  94  * Externalized all new (or forgot to be added) strings to all the code.
  95  *
  96  * 96    6/13/98 3:19p Hoffoss
  97  * NOX()ed out a bunch of strings that shouldn't be translated.
  98  *
  99  * 95    6/10/98 2:56p Dave
 100  * Substantial changes to reduce bandwidth and latency problems.
 101  *
 102  * 94    6/05/98 9:55a Lawrance
 103  * OEM changes
 104  *
 105  * 93    5/24/98 2:17p Allender
 106  * make reliable socket read all data before returning
 107  *
 108  * 92    5/22/98 10:54a Allender
 109  * new dialog information for networking to tell user if connection type
 110  * doesn't match the setup specified type
 111  *
 112  * 91    5/21/98 3:31p Allender
 113  * more RAS stuff -- fix possible problem when unable to read data on
 114  * reliable socket
 115  *
 116  * 90    5/20/98 4:34p John
 117  * fixed some bugs with rasenum connections.  HAd to specify ansi versions
 118  * in dll.   Also, my pc returned 0 connections, before that still said
 119  * there was a connection.
 120  *
 121  * $NoKeywords: $
 122  */
 123
 124
 125 #ifndef PLAT_UNIX
 126 #include <windows.h>
 127 #include <windowsx.h>
 128 #include <winsock.h>
 129 #include <process.h>
 130 #include <ras.h>
 131 #include <raserror.h>
 132 #else
 133 #include <sys/types.h>
 134 #include <sys/socket.h>
 135 #include <netinet/in.h>
 136 #include <arpa/inet.h>
 137 #include <sys/ioctl.h>
 138 #include <netdb.h>
 139 #include <errno.h>
 140 #endif
 141 #include <stdio.h>
 142 #include <limits.h>
 143
 144 #include "pstypes.h"
 145 #include "psnet.h"
 146 #include "multi.h"
 147 #include "multiutil.h"
 148 #include "multilag.h"
 149 #include "osregistry.h"
 150 #include "timer.h"
 151 #include "multi_log.h"
 152 #include "cmdline.h"
 153
 154 #ifndef PSNET2
 155
 156 // old style packet buffering
 157 // #define PSNET_BUFFER_OLD_SCHOOL
 158
 159 // sockets for TCP
 160 SOCKET TCP_socket;
 161 SOCKET TCP_reliable_socket;
 162 SOCKET TCP_listen_socket;
 163
 164 // the sockets that the game will use when selecting network type
 165 SOCKET Unreliable_socket = INVALID_SOCKET;
 166 SOCKET Reliable_socket = INVALID_SOCKET;
 167 SOCKET Listen_socket = INVALID_SOCKET;
 168
 169 int             Psnet_my_addr_valid;
 170 net_addr_t Psnet_my_addr;
 171
 172 ubyte Null_address[IP_ADDRESS_LENGTH];
 173
 174 int Socket_type;
 175 int Can_broadcast;                      // can we do broadcasting on our socket?
 176 int Tcp_can_broadcast = 0;
 177
 178 int Tcp_active = 0;
 179
 180 int Network_status;
 181 int Tcp_failure_code = 0;
 182 int Ras_connected;
 183 int Psnet_connection;
 184
 185 ushort  Psnet_default_port;
 186
 187 unsigned int Serverconn = 0xffffffff;
 188
 189 // specified their internet connnection type
 190 #define NETWORK_CONNECTION_NONE                 1
 191 #define NETWORK_CONNECTION_DIALUP               2
 192 #define NETWORK_CONNECTION_LAN                  3
 193
 194 // defines and variables to indicate network connection status
 195 #define NETWORK_STATUS_NOT_INITIALIZED  1
 196 #define NETWORK_STATUS_NO_WINSOCK               2                       // winsock failed to initialize
 197 #define NETWORK_STATUS_NO_PROTOCOL              3                       // specified protocol doesn't appear to be loaded
 198 #define NETWORK_STATUS_NO_RELIABLE              4
 199 #define NETWORK_STATUS_RUNNING                  5                       // everything should be running
 200
 201 // defintion of structures that actually leave this machine.  psnet_send give us only
 202 // the data that we want to send.  We will add a header onto this data (packet sequence
 203 // number, possibly a checksum).  We must include a 2 byte flags variable into both structure
 204 // since the receiving end of this packet must know whether or not to checksum the packet.
 205
 206 // use the pack pragma to pack these structures to 2 byte aligment.  Really only needed for
 207 // the naked packet.
 208
 209 #pragma pack(push, 2)
 210
 211 // packet def for a checksum'ed packet
 212 #define MAX_CHECKSUM_PACKET_SIZE                1024
 213 typedef struct network_checksum_packet
 214 {
 215         int             sequence_number;
 216         ushort  flags;
 217         ushort  checksum;
 218         ubyte           data[MAX_CHECKSUM_PACKET_SIZE];
 219 } network_checksum_packet;
 220
 221 // definition for a non-checksum packet
 222 typedef struct network_packet
 223 {
 224         int             sequence_number;
 225         ushort  flags;
 226         ubyte           data[MAX_PACKET_SIZE];
 227 } network_naked_packet;
 228
 229 // structure definition for our packet buffers
 230 typedef struct network_packet_buffer
 231 {
 232         int             sequence_number;
 233         int             len;
 234         net_addr_t      from_addr;
 235         ubyte           data[MAX_PACKET_SIZE];
 236 } network_packet_buffer;
 237
 238 #pragma pack(pop)
 239
 240 #define MAX_PACKET_BUFFERS              96
 241
 242 #ifdef PSNET_BUFFER_OLD_SCHOOL
 243         static network_packet_buffer packet_buffers[MAX_PACKET_BUFFERS];                // buffer to hold packets sent to us
 244         static short packet_free_list[MAX_PACKET_BUFFERS];                                                      // contains id's of free packet buffers
 245         static Num_packet_buffers;
 246         static int Largest_packet_index = 0;
 247
 248         int     Next_packet_id;
 249         int     Last_packet_id;
 250 #endif
 251
 252 // variables to keep track of bytes read/written during the course of network play
 253 #ifndef NDEBUG
 254
 255 #define PSNET_FRAME_FILTER              32
 256 #define MAX_NET_STATS                   32
 257
 258 typedef struct {
 259         int                             in_use;
 260         net_addr_t                      addr;                                           // stats for this address
 261         int                             total_read;                                     // total bytes read
 262         int                             total_written;                          // total bytes read.
 263 } net_stats;
 264
 265 typedef struct {
 266         net_addr_t                      addr;
 267         SOCKET                  socket;
 268 } socket_xlate;
 269
 270 net_stats Psnet_stats[MAX_NET_STATS];
 271 socket_xlate Psnet_socket_addr[MAX_NET_STATS];
 272
 273 int     psnet_bytes_read_frame;                 // running count of bytes read this frame
 274 int     psnet_bytes_written_frame;              // running count of bytes written this frame
 275
 276 int     Psnet_bytes_read;                                       // globally available numbers for printing on the hud
 277 int     Psnet_bytes_written;
 278
 279 int     psnet_read_sizes[PSNET_FRAME_FILTER];
 280 int     psnet_write_sizes[PSNET_FRAME_FILTER];
 281
 282 int     psnet_read_total;
 283 int     psnet_write_total;
 284 int     psnet_frame_int;
 285 int     psnet_frame_count;
 286
 287 #endif
 288
 289 #define MAXHOSTNAME                     128
 290
 291 #define MAX_RECEIVE_BUFSIZE     (1<<15)         // 32 K, eh?
 292 #define MAX_SEND_RETRIES                20                              // number of retries when sending would block
 293 #define MAX_LINGER_TIME                 0                               // in seconds -- when lingering to close a socket
 294
 295 #ifndef NDEBUG
 296
 297 int psnet_same_no_port( net_addr_t * a1, net_addr_t * a2 );
 298
 299 // do stats for a particular address.  num_bytes is the number of bytes either read or
 300 // written (depending on the read flag.  read flag is true when reading, 0 when writing
 301 void psnet_do_net_stats( net_addr_t *addr, int num_bytes, int read )
 302 {
 303         int i;
 304
 305         for ( i = 0; i < MAX_NET_STATS; i++ ) {
 306                 if ( !Psnet_stats[i].in_use )
 307                         continue;
 308                 if ( addr && psnet_same_no_port(&Psnet_stats[i].addr, addr) )
 309                         break;
 310         }
 311
 312         if ( i == MAX_NET_STATS ) {
 313                 // find the first NULL entry
 314                 for ( i = 0; i < MAX_NET_STATS; i++ ) {
 315                         if ( !Psnet_stats[i].in_use )
 316                                 break;
 317                 }
 318                 if ( i == MAX_NET_STATS ) {
 319                         Int3();                         // we should always have a slot
 320                         return;
 321                 }
 322                 Psnet_stats[i].addr = *addr;
 323                 Psnet_stats[i].in_use = 1;
 324         }
 325         if ( read )
 326                 Psnet_stats[i].total_read += num_bytes;
 327         else
 328                 Psnet_stats[i].total_written += num_bytes;
 329 }
 330
 331 // returns the stats for the given network address.  returns 1 when (i.e. net_addr was found),
 332 // 0 otherwise.  total read and total written are returned in the parameters
 333 int psnet_get_stats( net_addr_t *addr, int *tr, int *tw )
 334 {
 335         int i;
 336
 337         for ( i = 0; i < MAX_NET_STATS; i++ ) {
 338                 if ( !Psnet_stats[i].in_use )
 339                         continue;
 340
 341                 if ( addr && psnet_same_no_port(&Psnet_stats[i].addr, addr) )
 342                         break;
 343         }
 344
 345         if ( i == MAX_NET_STATS )
 346                 return 0;
 347
 348         *tr = Psnet_stats[i].total_read;
 349         *tw = Psnet_stats[i].total_written;
 350
 351         return 1;
 352 }
 353
 354 void psnet_stats_init()
 355 {
 356         int i;
 357
 358         for ( i = 0; i < MAX_NET_STATS; i++ ) {
 359                 Psnet_stats[i].in_use = 0;
 360                 Psnet_stats[i].total_read = 0;
 361                 Psnet_stats[i].total_written = 0;
 362                 Psnet_socket_addr[i].socket = INVALID_SOCKET;
 363         }
 364 }
 365
 366 #endif
 367
 368
 369 // function called from high level FreeSpace code to determine the status of the networking
 370 // code returns one of a handful of macros
 371 int psnet_get_network_status()
 372 {
 373         // first case is when "none" is selected
 374         if ( Psnet_connection == NETWORK_CONNECTION_NONE ) {
 375                 return NETWORK_ERROR_NO_TYPE;
 376         }
 377
 378         // first, check the connection status of the network
 379         if ( Network_status == NETWORK_STATUS_NO_WINSOCK )
 380                 return NETWORK_ERROR_NO_WINSOCK;
 381
 382         if ( Network_status == NETWORK_STATUS_NO_PROTOCOL )
 383                 return NETWORK_ERROR_NO_PROTOCOL;
 384
 385         // network is running -- be sure that the RAS people know to connect if they currently cannot.
 386
 387         if ( Psnet_connection == NETWORK_CONNECTION_DIALUP ) {
 388                 // if on a dialup connection, be sure that RAS is active.
 389                 if ( !Ras_connected ) {
 390                         return NETWORK_ERROR_CONNECT_TO_ISP;
 391                 }
 392         } else if ( Psnet_connection == NETWORK_CONNECTION_LAN ) {
 393                 // if on a LAN, and they have a dialup connection active, return error to indicate that they need
 394                 // to pick the right connection type
 395                 if ( Ras_connected ) {
 396                         return NETWORK_ERROR_LAN_AND_RAS;
 397                 }
 398         }
 399         return NETWORK_ERROR_NONE;
 400 }
 401
 402 #ifndef PLAT_UNIX
 403 DWORD (__stdcall *pRasEnumConnections)(LPRASCONN lprasconn, LPDWORD lpcb, LPDWORD lpcConnections) = NULL;
 404 DWORD (__stdcall *pRasGetConnectStatus)(HRASCONN hrasconn, LPRASCONNSTATUS lprasconnstatus ) = NULL;
 405 DWORD (__stdcall *pRasGetProjectionInfo)(HRASCONN hrasconn, RASPROJECTION rasprojection, LPVOID lpprojection, LPDWORD lpcb ) = NULL;
 406 #endif
 407
 408 // functions to get the status of a RAS connection
 409 void psnet_ras_status()
 410 {
 411 #ifndef PLAT_UNIX
 412         int rval;
 413         unsigned long size, num_connections, i;
 414         RASCONN rasbuffer[25];
 415         HINSTANCE ras_handle;
 416
 417         Ras_connected = 0;
 418
 419         // first, call a LoadLibrary to load the RAS api
 420         ras_handle = LoadLibrary( NOX("rasapi32.dll") );
 421         if ( ras_handle == NULL ) {
 422                 return;
 423         }
 424
 425         pRasEnumConnections = (DWORD (__stdcall *)(LPRASCONN, LPDWORD, LPDWORD))GetProcAddress(ras_handle, NOX("RasEnumConnectionsA"));
 426         if (!pRasEnumConnections)       {
 427                 FreeLibrary( ras_handle );
 428                 return;
 429         }
 430         pRasGetConnectStatus = (DWORD (__stdcall *)(HRASCONN, LPRASCONNSTATUS))GetProcAddress(ras_handle, NOX("RasGetConnectStatusA"));
 431         if (!pRasGetConnectStatus)      {
 432                 FreeLibrary( ras_handle );
 433                 return;
 434         }
 435         pRasGetProjectionInfo = (DWORD (__stdcall *)(HRASCONN, RASPROJECTION, LPVOID, LPDWORD))GetProcAddress(ras_handle, NOX("RasGetProjectionInfoA"));
 436         if (!pRasGetProjectionInfo)     {
 437                 FreeLibrary( ras_handle );
 438                 return;
 439         }
 440
 441         size = sizeof(rasbuffer);
 442         rasbuffer[0].dwSize = sizeof(RASCONN);
 443
 444         rval = pRasEnumConnections( rasbuffer, &size, &num_connections );
 445         if ( rval ) {
 446                 FreeLibrary( ras_handle );
 447                 return;
 448         }
 449
 450         // JAS: My computer gets to this point, but I have no RAS connections,
 451         // so just exit
 452         if ( num_connections < 1 )      {
 453                 nprintf(("Network", "Found no connections\n" ));
 454                 FreeLibrary( ras_handle );
 455                 return;
 456         }
 457
 458         nprintf(("Network", "Found %d connections\n", num_connections));
 459
 460         for (i = 0; i < num_connections; i++ ) {
 461                 RASCONNSTATUS status;
 462                 RASPPPIP projection;
 463                 unsigned long size;
 464
 465                 nprintf(("Network", "Connection %d:\n", i));
 466                 nprintf(("Network", "Entry Name: %s\n", rasbuffer[i].szEntryName));
 467                 nprintf(("Network", "Device Type: %s\n", rasbuffer[i].szDeviceType));
 468                 nprintf(("Network", "Device Name: %s\n", rasbuffer[i].szDeviceName));
 469
 470                 // get the connection status
 471                 status.dwSize = sizeof(RASCONNSTATUS);
 472                 rval = pRasGetConnectStatus(rasbuffer[i].hrasconn, &status);
 473                 if ( rval != 0 ) {
 474                         FreeLibrary( ras_handle );
 475                         return;
 476                 }
 477
 478                 nprintf(("Network", "\tStatus: %s\n", (status.rasconnstate==RASCS_Connected)?"Connected":"Not Connected"));
 479
 480                 // get the projection informatiom
 481                 size = sizeof(projection);
 482                 projection.dwSize = size;
 483                 rval = pRasGetProjectionInfo(rasbuffer[i].hrasconn, RASP_PppIp, &projection, &size );
 484                 if ( rval != 0 ) {
 485                         FreeLibrary( ras_handle );
 486                         return;
 487                 }
 488
 489                 printf(("Network", "\tIP Address: %s\n", projection.szIpAddress));
 490         }
 491
 492         Ras_connected = 1;
 493
 494         FreeLibrary( ras_handle );
 495 #endif
 496 }
 497
 498 // -------------------------------------------------------------------------------------------------
 499 // netmisc_calc_checksum() calculates the checksum of a block of memory.
 500 //
 501 //
 502 ushort psnet_calc_checksum( void * vptr, int len )
 503 {
 504         ubyte * ptr = (ubyte *)vptr;
 505         unsigned int sum1,sum2;
 506
 507         sum1 = sum2 = 0;
 508
 509         while(len--)    {
 510                 sum1 += *ptr++;
 511                 if (sum1 >= 255 ) sum1 -= 255;
 512                 sum2 += sum1;
 513         }
 514         sum2 %= 255;
 515
 516         return (unsigned short)((sum1<<8)+ sum2);
 517 }
 518
 519 // -------------------------------------------------------------------------------------------------
 520 // psnet_set_socket_mode()
 521 //
 522 //
 523
 524 int psnet_set_socket_mode(SOCKET sock_id, int opt, int toggle)
 525 {
 526         return (setsockopt(sock_id, SOL_SOCKET, opt, (char *)&toggle, sizeof(toggle)));
 527 }
 528
 529
 530 // -------------------------------------------------------------------------------------------------
 531 // sock_get_ip() returns the IP address of this computer.
 532 //
 533 //
 534
 535 uint sock_get_ip()
 536 {
 537         char LclHost[MAXHOSTNAME];
 538         struct hostent *Hostent;
 539         struct sockaddr_in LclAddr;
 540         struct sockaddr_in RmtAddr;
 541         SOCKET hSock;
 542         int nRet;
 543
 544         // Init local address to zero
 545         LclAddr.sin_addr.s_addr = INADDR_ANY;
 546
 547         // Get the local host name
 548         nRet = gethostname(LclHost, MAXHOSTNAME );
 549         if (nRet != SOCKET_ERROR )      {
 550                 // Resolve host name for local address
 551                 Hostent = gethostbyname((char *)LclHost);
 552                 if ( Hostent )
 553                         LclAddr.sin_addr.s_addr = ((in_addr *)(Hostent->h_addr))->s_addr;
 554         }
 555
 556         return LclAddr.sin_addr.s_addr;
 557
 558         RmtAddr = RmtAddr;
 559         hSock = hSock;
 560 }
 561
 562 // psnet_get_ip() attempts to get the local IP address of this machine
 563 // returns 0 on failure, and 1 on success
 564 int psnet_get_ip( SOCKET s )
 565 {
 566         int rval;
 567 #ifndef PLAT_UNIX
 568         int len;
 569 #else
 570         socklen_t len;
 571 #endif
 572         struct sockaddr_in local_addr;
 573
 574         if ( Psnet_my_addr_valid ){
 575                 return 1;
 576         }
 577
 578         memset(&local_addr, 0, sizeof(struct sockaddr_in));
 579         len = sizeof(struct sockaddr_in);
 580         rval = getsockname(s, (struct sockaddr *)&local_addr, &len );
 581         if ( rval == SOCKET_ERROR )
 582                 return 0;
 583
 584         // now we should have an IP address of this machine.
 585         memcpy(Psnet_my_addr.addr, &(local_addr.sin_addr), 4);
 586         Psnet_my_addr.port = ntohs(local_addr.sin_port);
 587
 588         Psnet_my_addr_valid = 1;
 589         return 1;
 590 }
 591
 592 // -------------------------------------------------------------------------------------------------
 593 // psnet_close()
 594 //
 595 //
 596
 597 void psnet_close()
 598 {
 599 #ifndef PSNET_RELIABLE_OLD_SCHOOL
 600         psnet_reliable_close();
 601 #endif
 602
 603         if ( Network_status != NETWORK_STATUS_RUNNING )
 604                 return;
 605
 606 #ifndef PLAT_UNIX
 607         WSACancelBlockingCall();
 608 #endif
 609
 610         if ( TCP_listen_socket != (SOCKET)INVALID_SOCKET ) {
 611                 shutdown( TCP_listen_socket, 1 );
 612                 closesocket( TCP_listen_socket );
 613         }
 614
 615         if ( TCP_reliable_socket != (SOCKET)INVALID_SOCKET ) {
 616                 shutdown( TCP_reliable_socket, 1 );
 617                 closesocket( TCP_reliable_socket );
 618         }
 619
 620         if ( TCP_socket != (SOCKET)INVALID_SOCKET ) {
 621                 shutdown( TCP_socket, 1 );
 622                 closesocket( TCP_socket );
 623         }
 624
 625 #ifndef PLAT_UNIX
 626         if (WSACleanup())       {
 627                 //Warning( LOCATION, "Error closing wsock!\n" );
 628         }
 629 #endif
 630
 631         Network_status = NETWORK_STATUS_NOT_INITIALIZED;
 632 }
 633
 634 // function to initialize a reliable socket.  All it does is call the socket() command.
 635 // returns 1 on success, 0 on failure.
 636 int psnet_init_stream( SOCKET *s, int type )
 637 {
 638         SOCKET sock;
 639
 640         SDL_assert(type == NET_TCP);
 641
 642         sock = socket(AF_INET,SOCK_STREAM,0);
 643         if ( sock == (SOCKET)INVALID_SOCKET )
 644                 return 0;
 645
 646         *s = sock;
 647
 648         return 1;
 649 }
 650
 651 // called by psnet_init to initialize the listen socket used by a host/server
 652 int psnet_init_reliable(ushort port, int should_listen, int type)
 653 {
 654         SOCKET sock = 0;                // JAS: Get rid of optimized warning
 655         struct sockaddr_in sockaddr;            // UDP/TCP socket structure
 656
 657         // set up the reliable TCP transport socket
 658         if ( !psnet_init_stream(&sock, type) ) {
 659                 nprintf(("Network", "Unable to initialize reliable socket on port %d (%d)!\n"  , port, WSAGetLastError() ));
 660                 return INVALID_SOCKET;
 661         }
 662
 663         // bind the socket to the port
 664         SDL_assert(type == NET_TCP);
 665
 666         memset( &sockaddr, 0, sizeof(struct sockaddr_in) );
 667         sockaddr.sin_family = AF_INET;
 668         sockaddr.sin_addr.s_addr = INADDR_ANY;  //fill in with our IP
 669         sockaddr.sin_port = htons( port );
 670         if ( bind(sock, (struct sockaddr*)&sockaddr, sizeof (sockaddr)) == SOCKET_ERROR) {
 671                 nprintf(("Network", "Unable to bind reliable socket on port %d (%d)!\n"  , port, WSAGetLastError() ));
 672                 return INVALID_SOCKET;
 673         }
 674
 675
 676         // set up the listen on the Reliable_socket port
 677         if ( should_listen && listen(sock, 5) ) {
 678                 nprintf(("Network", "Unable to listen on Listen Socket (%d)!\n"  , WSAGetLastError() ));
 679                 return INVALID_SOCKET;
 680         }
 681
 682         // make any reliable sockets which we create that aren't listening non-blocking sockets
 683         if ( !should_listen ) {
 684                 int error;
 685                 unsigned long arg;
 686
 687                 arg = TRUE;
 688                 error = ioctlsocket( sock, FIONBIO, &arg );
 689                 if ( error == SOCKET_ERROR ) {
 690                         nprintf(("Network", "Unable to make reliable socket non-blocking -- %d", WSAGetLastError() ));
 691                         return INVALID_SOCKET;
 692                 }
 693
 694                 // set the reuse option
 695                 if ( psnet_set_socket_mode(sock, SO_REUSEADDR, 1) == SOCKET_ERROR ) {
 696                         error = WSAGetLastError();
 697                         nprintf(("Network", "Error setting socket to reuse address -- %d\n", error));
 698                 }
 699
 700         }
 701
 702         return sock;
 703 }
 704
 705 void psnet_socket_options( SOCKET sock )
 706 {
 707         int broadcast;
 708         int ret, cursize, bufsize, trysize;
 709 #ifndef PLAT_UNIX
 710         int cursizesize;
 711 #else
 712         socklen_t cursizesize;
 713 #endif
 714
 715         // Set the mode of the socket to allow broadcasting.  We need to be able to broadcast
 716         // when a game is searched for in IPX mode.
 717         broadcast = 1;
 718         if(setsockopt(sock, SOL_SOCKET, SO_BROADCAST, (char *)&broadcast, sizeof(broadcast) )){
 719                 Can_broadcast = 0;
 720         } else {
 721                 Can_broadcast = 1;
 722         }
 723
 724         // try and increase the size of my receive buffer
 725         bufsize = MAX_RECEIVE_BUFSIZE;
 726
 727         // set the current size of the receive buffer
 728         cursizesize = sizeof(int);
 729         getsockopt(sock, SOL_SOCKET, SO_RCVBUF, (char *)&cursize, &cursizesize);
 730         for ( trysize = bufsize; trysize >= cursize; trysize >>= 1 ) {
 731                 ret = setsockopt(sock, SOL_SOCKET, SO_RCVBUF, (char *)&trysize, sizeof(trysize));
 732                 if ( ret == SOCKET_ERROR ) {
 733                         int wserr;
 734
 735                         wserr = WSAGetLastError();
 736                         if ( (wserr == WSAENOPROTOOPT) || (wserr == WSAEINVAL) )
 737                                 break;
 738                 } else
 739                         break;
 740         }
 741         getsockopt(sock, SOL_SOCKET, SO_RCVBUF, (char *)&cursize, &cursizesize);
 742         nprintf(("Network", "Receive buffer set to %d\n", cursize));
 743
 744         // set the current size of the send buffer
 745         cursizesize = sizeof(int);
 746         getsockopt(sock, SOL_SOCKET, SO_SNDBUF, (char *)&cursize, &cursizesize);
 747         for ( trysize = bufsize; trysize >= cursize; trysize >>= 1 ) {
 748                 ret = setsockopt(sock, SOL_SOCKET, SO_SNDBUF, (char *)&trysize, sizeof(trysize));
 749                 if ( ret == SOCKET_ERROR ) {
 750                         int wserr;
 751
 752                         wserr = WSAGetLastError();
 753                         if ( (wserr == WSAENOPROTOOPT) || (wserr == WSAEINVAL) )
 754                                 break;
 755                 } else
 756                         break;
 757         }
 758         getsockopt(sock, SOL_SOCKET, SO_SNDBUF, (char *)&cursize, &cursizesize);
 759         nprintf(("Network", "Send buffer set to %d\n", cursize));
 760 }
 761
 762
 763 // psnet_init called at game startup time and initializes all sockets that the game might use (i.e. for both
 764 // IPX and TCP).
 765 void psnet_init( int protocol, int port_num )
 766 {
 767         const char *internet_connection;
 768 #ifndef PLAT_UNIX
 769         WSADATA wsa_data;
 770 #endif
 771
 772         // UDP/TCP socket structure
 773         struct sockaddr_in sockaddr;
 774
 775         Tcp_active = 0;
 776
 777 #if defined(DEMO) || defined(OEM_BUILD) // not for FS2_DEMO
 778         return;
 779 #endif
 780
 781         // GAME PORT INITIALIZATION STUFF
 782         if ( Network_status == NETWORK_STATUS_RUNNING )
 783                 return;
 784
 785         // 'lan' should be a safe default in 2015
 786         internet_connection = os_config_read_string("Network", "NetworkConnection", "LAN");
 787
 788         if ( !SDL_strcasecmp(internet_connection, NOX("dialup")) ) {
 789                 ml_string("psnet_init() detected dialup connection");
 790
 791                 Psnet_connection = NETWORK_CONNECTION_DIALUP;
 792         } else if ( !SDL_strcasecmp(internet_connection, NOX("lan")) ) {
 793                 ml_string("psnet_init() detected lan connection");
 794
 795                 Psnet_connection = NETWORK_CONNECTION_LAN;
 796         } else {
 797                 ml_string("psnet_init() detected no connection");
 798
 799                 Psnet_connection = NETWORK_CONNECTION_NONE;
 800         }
 801
 802         Network_status = NETWORK_STATUS_NO_WINSOCK;
 803
 804 #ifndef PLAT_UNIX
 805         if (WSAStartup(0x101, &wsa_data )){
 806                 return;
 807         }
 808 #endif
 809
 810         // get the port for running this game on.  Be careful that it cannot be out of bounds
 811         Psnet_default_port = DEFAULT_GAME_PORT;
 812         if ( (port_num > 1023) && (port_num < USHRT_MAX) ) {
 813                 Psnet_default_port = (ushort)port_num;
 814         }
 815
 816 #ifndef PSNET_RELIABLE_OLD_SCHOOL
 817         if(!psnet_reliable_init()){
 818                 nprintf(("Network","PSNET RELIABLE : init failed - no networking available!\n"));
 819                 return;
 820         }
 821 #endif
 822
 823         // initialize TCP now
 824         TCP_socket = INVALID_SOCKET;
 825         TCP_reliable_socket = INVALID_SOCKET;
 826         TCP_listen_socket = INVALID_SOCKET;
 827
 828         Network_status = NETWORK_STATUS_NO_PROTOCOL;
 829         TCP_socket = socket( AF_INET, SOCK_DGRAM, 0 );
 830         if ( TCP_socket == (SOCKET)INVALID_SOCKET ) {
 831                 Tcp_failure_code = WSAGetLastError();
 832                 nprintf(("Network", "Error on TCP startup %d\n", Tcp_failure_code));
 833                 return;
 834         }
 835
 836         // bind the socket
 837         memset(&sockaddr,0,sizeof(struct sockaddr_in));
 838         sockaddr.sin_family = AF_INET;
 839
 840         sockaddr.sin_addr.s_addr = INADDR_ANY;  //fill in with our IP
 841
 842         sockaddr.sin_port = htons( Psnet_default_port );
 843         if ( bind(TCP_socket, (struct sockaddr*)&sockaddr, sizeof (sockaddr)) == SOCKET_ERROR) {
 844                 Tcp_failure_code = WSAGetLastError();
 845                 nprintf(( "Network", "Couldn't bind TCP socket (%d)! Invalidating TCP\n", Tcp_failure_code ));
 846                 return;
 847         }
 848
 849 #ifdef PSNET_RELIABLE_OLD_SCHOOL
 850         // set up reliable socket (using SPX).
 851         TCP_reliable_socket = psnet_init_reliable( 0, 0, NET_TCP );
 852         if ( TCP_reliable_socket == (SOCKET)INVALID_SOCKET ) {
 853                 Tcp_failure_code = WSAGetLastError();
 854                 nprintf(( "Network", "Couldn't initialize TCP reliable socket (OLD SCHOOL) (%d)! Invalidating TCP\n", Tcp_failure_code ));
 855                 return;
 856         }
 857
 858         TCP_listen_socket = psnet_init_reliable( (u_short)(Psnet_default_port-1), 1, NET_TCP );
 859         if ( TCP_listen_socket == (SOCKET)INVALID_SOCKET ) {
 860                 Tcp_failure_code = WSAGetLastError();
 861                 nprintf(( "Network", "Couldn't initialize TCP listen socket (OLD SCHOOL) (%d)! Invalidating TCP\n", Tcp_failure_code ));
 862                 return;
 863         }
 864 #endif
 865
 866         Tcp_active = 1;
 867
 868         psnet_socket_options( TCP_socket );
 869         Tcp_can_broadcast = Can_broadcast;
 870         Can_broadcast = 0;
 871
 872 // fire up a second UDP socket for "reliable" transport
 873 #ifndef PSNET_RELIABLE_OLD_SCHOOL
 874         TCP_reliable_socket = socket( AF_INET, SOCK_DGRAM, 0 );
 875         if ( TCP_reliable_socket != INVALID_SOCKET )    {
 876                 // bind the socket
 877                 memset(&sockaddr,0,sizeof(struct sockaddr_in));
 878                 sockaddr.sin_family = AF_INET;
 879
 880                 sockaddr.sin_addr.s_addr = INADDR_ANY;  //fill in with our IP
 881                 //unsigned long my_ip = sock_get_ip();
 882                 //memcpy(&sockaddr.sin_addr.s_addr,&my_ip,sizeof(uint));
 883
 884                 sockaddr.sin_port = htons( (ushort)(port+1) );
 885                 if ( bind(TCP_reliable_socket, (struct sockaddr*)&sockaddr, sizeof (sockaddr)) == SOCKET_ERROR) {
 886                         nprintf(( "Network", "Couldn't bind TCP socket (%d)! Invalidating TCP\n", WSAGetLastError() ));
 887                         goto tcp_done;
 888                 }
 889
 890                 psnet_socket_options( TCP_reliable_socket );
 891                 Can_broadcast = 0;
 892         }
 893 #endif
 894
 895         psnet_ras_status();
 896
 897         Network_status = NETWORK_STATUS_RUNNING;
 898
 899         nprintf(("Network","TCP Initialized\n"));
 900
 901         // with TCP initialized, see if the RAS services are installed
 902
 903
 904 #ifndef NDEBUG
 905         psnet_frame_int = -1;           // for counting bytes per frame
 906 #endif
 907
 908 #ifdef PSNET_BUFFER_OLD_SCHOOL
 909         Next_packet_id = 0;
 910         Last_packet_id = -1;
 911
 912         // initialize the packet buffer stuff.  We use an array (the packet_free_list) to determine
 913         // which of the packet buffers we can use next.
 914         int i;
 915         for (i=0; i<MAX_PACKET_BUFFERS; i++ )   {
 916                 packet_buffers[i].sequence_number = -1;
 917                 packet_free_list[i] = (short)i;
 918         }
 919         Num_packet_buffers = 0;
 920         Largest_packet_index = 0;
 921 #else
 922         // initialize the new buffering system
 923         psnet_buffer_init();
 924 #endif
 925 }
 926
 927 #define MAX_TMPBUF_SIZE 1024
 928
 929 #ifdef PSNET_RELIABLE_OLD_SCHOOL
 930 // function to shutdown and close the given socket.  It takes a couple of things into consideration
 931 // when closing, such as possibly reiniting reliable sockets if they are closed here.
 932 void psnet_rel_close_socket( PSNET_SOCKET *p_sockp )
 933 {
 934         int reinit_type;
 935         int error, rval;
 936         SOCKET *sockp;
 937
 938         sockp = (SOCKET *)p_sockp;
 939
 940         if ( *sockp == (SOCKET)INVALID_SOCKET )
 941                 return;
 942
 943 #ifndef NDEBUG
 944         if ( *sockp == TCP_reliable_socket )
 945                 nprintf(("network", "Closing my relibale TCP socket\n"));
 946         else
 947                 nprintf(("Network", "Closing client's reliable socket\n"));
 948 #endif
 949
 950         // make the socket blocking
 951         //unsigned long val = 0;
 952         //rval = ioctlsocket(*sockp,FIONBIO,&val);
 953         //if ( rval == SOCKET_ERROR ) {
 954         //      error = WSAGetLastError();
 955         //      nprintf(("Network", "Error %d when trying to make reliable socket blocking.\n", error));
 956         //}
 957
 958         // set the socket to linger with a timeout of 0
 959         linger l_val;
 960         l_val.l_onoff = 1;
 961         l_val.l_linger = 0;
 962         rval = setsockopt(*sockp,SOL_SOCKET,SO_LINGER,(char*)&l_val,sizeof(linger));
 963         if ( rval == SOCKET_ERROR ) {
 964                 error = WSAGetLastError();
 965                 nprintf(("Network", "Error %d when trying to set linger value.\n", error));
 966         }
 967
 968         // see if this socket is my Reliable_socket.  If so, I will have to reinitialize it!
 969         reinit_type = -1;
 970         if ( *sockp == TCP_reliable_socket )
 971                 reinit_type = NET_TCP;
 972
 973         // if this is the server connection, mark it as done
 974         if (*sockp == (SOCKET)Serverconn) {
 975                 Serverconn = 0xffffffff;
 976         }
 977
 978         /*
 979         rval = shutdown( *sockp, 2);            // shut the whole damn thing down.
 980         if ( rval == SOCKET_ERROR ) {
 981                 error = WSAGetLastError();
 982                 nprintf(("Network", "Error %d on socket shutdown\n", error));
 983         }
 984         */
 985
 986         shutdown( *sockp, 1 );
 987         rval = 1;
 988         while ( rval && (rval != SOCKET_ERROR) ) {
 989                 char tmp_buf[MAX_TMPBUF_SIZE];
 990
 991                 rval = recv( *sockp, tmp_buf, MAX_TMPBUF_SIZE, 0 );
 992                 if ( rval == SOCKET_ERROR ) {
 993                         int error;
 994
 995                         error = WSAGetLastError();
 996                         if ( NETCALL_WOULDBLOCK(error) )
 997                                 break;
 998                 }
 999         }
1000
1001         rval = closesocket( *sockp );
1002         if ( rval == SOCKET_ERROR ) {
1003                 error = WSAGetLastError();
1004                 nprintf(("Network", "Error %d on closing socket\n", error ));
1005         }
1006
1007         *sockp = INVALID_SOCKET;
1008
1009         // see if we need to reinitialize
1010         if ( reinit_type != -1 ) {
1011                 if ( reinit_type == NET_TCP){
1012                         TCP_reliable_socket = psnet_init_reliable( 0, 0, NET_TCP);
1013                         Reliable_socket = TCP_reliable_socket;
1014                 }
1015         }
1016 }
1017 #else
1018 // function to shutdown and close the given socket.  It takes a couple of things into consideration
1019 // when closing, such as possibly reiniting reliable sockets if they are closed here.
1020 void psnet_close_socket( PSNET_SOCKET *p_sockp )
1021 {
1022         net_addr_t remove;
1023
1024         // copy the address to be removed
1025         memcpy(&remove,&((net_addr_t*)(*p_sockp)),sizeof(net_addr_t));
1026
1027         // remove it from the reliable address list
1028         psnet_reliable_notify_drop_addr(&remove);
1029
1030         // invalidate the passed in "socket"
1031         *p_sockp = NULL;
1032 }
1033 #endif
1034
1035 // function to check the status of the reliable socket and try to re-initialize it if necessary.
1036 // win95 seems to have trouble doing a reinit of the socket immediately after close, so this
1037 // function exists to check the status, and reinitialize if we need to
1038 int psnet_rel_check()
1039 {
1040         // if our Reliable_socket is valid, simply return true to indicate all is well.
1041         if ( Reliable_socket != (SOCKET)INVALID_SOCKET )
1042                 return 1;
1043
1044         // based on our protocol type, try to reinitialize the socket we need.
1045         SDL_assert(Socket_type == NET_TCP);
1046
1047         TCP_reliable_socket = psnet_init_reliable( 0, 0, NET_TCP);
1048         Reliable_socket = TCP_reliable_socket;
1049
1050         // return our status.
1051         if ( Reliable_socket == (SOCKET)INVALID_SOCKET )
1052                 return 0;
1053
1054         return 1;
1055 }
1056
1057 // this function is called from a high level at FreeSpace to set the protocol that the user wishes to use
1058 int psnet_use_protocol( int protocol )
1059 {
1060         // zero out my address
1061         Psnet_my_addr_valid = 0;
1062         memset( &Psnet_my_addr, 0, sizeof(Psnet_my_addr) );
1063
1064         // wait until we choose a protocol to determine if we can broadcast
1065         Can_broadcast = 0;
1066
1067         SDL_assert(protocol == NET_TCP);
1068
1069         if ( Network_status != NETWORK_STATUS_RUNNING )
1070                 return 0;
1071
1072         // assign the TCP_* sockets to the socket values used elsewhere
1073         Unreliable_socket = TCP_socket;
1074         Reliable_socket = TCP_reliable_socket;
1075         Listen_socket = TCP_listen_socket;
1076
1077         Can_broadcast = Tcp_can_broadcast;
1078         if(Can_broadcast){
1079                 nprintf(("Network","Psnet : TCP broadcast\n"));
1080         }
1081
1082         nprintf(("Network","Psnet using - NET_TCP\n"));
1083
1084         Psnet_my_addr.type = protocol;
1085         Socket_type = protocol;
1086
1087         return 1;
1088 }
1089
1090 #define MAX_CONNECT_TRIES       10
1091
1092 // attacmpt to connect() to the server's tcp socket.  socket parameter is simply assigned to the
1093 // Reliable_socket socket created in psnet_init
1094 void psnet_rel_connect_to_server( PSNET_SOCKET *psocket, net_addr_t *server_addr)
1095 {
1096         struct sockaddr_in sockaddr;                            // UDP/TCP socket structure
1097         struct sockaddr *addr;                                          // pointer to struct sockaddr to make coding easier
1098         SOCKET *socket;
1099         ubyte iaddr[IP_ADDRESS_LENGTH];
1100         u_short port;
1101         int name_length, val;
1102
1103         memset(iaddr, 0x00, IP_ADDRESS_LENGTH);
1104         memcpy(iaddr, server_addr->addr, IP_ADDRESS_LENGTH);
1105         port = (u_short)(server_addr->port - 1);
1106
1107         socket = (SOCKET *)psocket;
1108
1109         SDL_assert(Socket_type == NET_TCP);
1110
1111         sockaddr.sin_family = AF_INET;
1112         memcpy(&sockaddr.sin_addr.s_addr, iaddr, 4);
1113         sockaddr.sin_port = htons(port);
1114         addr = (struct sockaddr *)&sockaddr;
1115         name_length = sizeof(sockaddr);
1116
1117         // NETLOG
1118         ml_string(NOX("Attempting to perform reliable TCP connect to server"));
1119
1120         // connect this guys Reliable_socket to the socket parameter passed in
1121         *socket = INVALID_SOCKET;
1122         val = connect(Reliable_socket, addr, name_length);
1123
1124          // I suppose that we could have a valid socket right away
1125         if ( val != SOCKET_ERROR ) {
1126                 *socket = Reliable_socket;
1127         } else {
1128                 int error;
1129
1130                 error = WSAGetLastError();
1131                 if ( NETCALL_WOULDBLOCK(error) ) {                      // use select to find out when socket is writeable
1132                         int is_set, num_tries;
1133                         fd_set wfds;
1134                         struct timeval timeout;
1135
1136                         // call select -- and return if an error leaving our connection to the client invalid
1137                         num_tries = 0;
1138                         do {
1139                                 FD_ZERO(&wfds);
1140                                 FD_SET( Reliable_socket, &wfds );
1141                                 timeout.tv_sec = 0;
1142                                 timeout.tv_usec = 500000;                       //500000 micro seconds is 1/2 second
1143
1144                                 is_set = select( Reliable_socket+1, NULL, &wfds, NULL, &timeout);
1145
1146                                 // check for error on select first
1147                                 if ( is_set == SOCKET_ERROR ) {
1148                                         nprintf(("Network", "Error on select for connect %d\n", WSAGetLastError() ));
1149                                         return;
1150                                 } else if (is_set) {                    // if set, then we have connection, move forward
1151                                         break;
1152                                 } else {
1153                                         SDL_Delay(10);                                  // sleep for 10 ms and try again
1154                                         num_tries++;
1155                                 }
1156                         } while ( num_tries < MAX_CONNECT_TRIES );
1157
1158                         if ( num_tries == MAX_CONNECT_TRIES )
1159                                 return;
1160
1161                         *socket = Reliable_socket;
1162
1163                 } else {
1164                         nprintf(("Network", "Connecting with server failed %d\n", error ));
1165                         *socket = INVALID_SOCKET;
1166                 }
1167         }
1168
1169         // if we have a connection, get my address from getsockname
1170         if ( *socket == Reliable_socket ) {
1171                 if ( !psnet_get_ip(Reliable_socket) ) {
1172                         *socket = INVALID_SOCKET;
1173                         return;
1174                 }
1175
1176                 Serverconn = *socket;
1177         }
1178 }
1179
1180 #ifndef NDEBUG
1181 void psnet_calc_bytes_per_frame()
1182 {
1183 }
1184 #endif
1185
1186 // -------------------------------------------------------------------------------------------------
1187 // psnet_same()
1188 //
1189 //
1190
1191 int psnet_same_no_port( net_addr_t * a1, net_addr_t * a2 )
1192 {
1193         if ( !memcmp(a1->addr, a2->addr, IP_ADDRESS_LENGTH) )
1194                 return 1;
1195         return 0;
1196 }
1197
1198 int psnet_same( net_addr_t * a1, net_addr_t * a2 )
1199 {
1200         return psnet_same_no_port( a1, a2 );
1201 /*
1202         if ( !memcmp(a1->addr, a2->addr, 6)  && a1->port == a2->port)
1203                 return 1;
1204         return 0;
1205 */
1206 }
1207
1208 // -------------------------------------------------------------------------------------------------
1209 // psnet_describe()
1210 //
1211 //
1212
1213 char* psnet_addr_to_string( char * text, const int max_textlen, net_addr_t * address )
1214 {
1215
1216         if ( Network_status != NETWORK_STATUS_RUNNING )         {
1217                 SDL_strlcpy( text, XSTR("[no networking]",910), max_textlen );
1218                 return text;
1219         }
1220
1221         in_addr temp_addr;
1222
1223         SDL_assert(address->type == NET_TCP);
1224
1225         switch ( address->type ) {
1226                 case NET_TCP:
1227                         memcpy(&temp_addr.s_addr, address->addr, 4);
1228                         SDL_strlcpy( text, inet_ntoa(temp_addr), max_textlen );
1229                         break;
1230
1231                 default:
1232                         // SDL_assert(0);
1233                         break;
1234
1235         } // end switch
1236
1237         return text;
1238 }
1239
1240
1241 // -------------------------------------------------------------------------------------------------
1242 // psnet_undescribe()
1243 //
1244 //
1245
1246 void psnet_string_to_addr( net_addr_t * address, char * text, const int max_textlen )
1247 {
1248         struct hostent *he;
1249         char str[255], *c, *port;
1250         in_addr addr;
1251
1252         if ( Network_status != NETWORK_STATUS_RUNNING ) {
1253                 SDL_strlcpy( text, XSTR("[no networking]",910), max_textlen );
1254                 return;
1255         }
1256
1257         // copy the text string to local storage to look for ports
1258         SDL_assert( strlen(text) < 255 );
1259         SDL_strlcpy(str, text, SDL_arraysize(str));
1260         c = strrchr(str, ':');
1261         port = NULL;
1262         if ( c ) {
1263                 *c = '\0';
1264                 port = c+1;
1265         }
1266
1267         switch ( address->type ) {
1268                 case NET_TCP:
1269                         addr.s_addr = inet_addr(str);
1270                         // if we get INADDR_NONE returns, then we need to try and resolve the host
1271                         // name
1272                         if ( addr.s_addr == INADDR_NONE ) {
1273                                 he = gethostbyname( str );
1274                                 // returns a non-null pointer if successful, so get the address
1275                                 if ( he ) {
1276                                         addr.s_addr = ((in_addr *)(he->h_addr))->s_addr;                        // this is the address in network byte order
1277                                 } else {
1278                                         addr.s_addr = INADDR_NONE;
1279                                 }
1280                         }
1281
1282                         memset(address->addr, 0x00, IP_ADDRESS_LENGTH);
1283                         memcpy(address->addr, &addr.s_addr, 4);
1284                         if ( port )
1285                                 address->port = (ushort)(atoi(port));
1286                         break;
1287
1288                 default:
1289                         SDL_assert(0);
1290                         break;
1291
1292         } // end switch
1293
1294 }
1295
1296 // psnet_get_socket_data() will get data out of the socket and stuff it into the packet_buffers
1297 // The original psnet_get() now calls this function, then determines which of the packet buffers
1298 // to package up and use
1299 void psnet_get_socket_data(SOCKET socket, int flags = PSNET_FLAG_RAW)
1300 {
1301         struct sockaddr_in ip_addr;                             // UDP/TCP socket structure
1302         fd_set  rfds;
1303         timeval timeout;
1304         int             read_len;
1305 #ifndef PLAT_UNIX
1306         int from_len;
1307 #else
1308         socklen_t from_len;
1309 #endif
1310         net_addr_t      from_addr;
1311         network_checksum_packet packet_read;
1312         network_checksum_packet packet_data;
1313
1314         // clear the addresses to remove compiler warnings
1315         memset(&ip_addr, 0, sizeof(struct sockaddr_in));
1316
1317         if ( Network_status != NETWORK_STATUS_RUNNING ) {
1318                 nprintf(("Network","Network ==> socket not inited in psnet_get\n"));
1319                 return;
1320         }
1321
1322         while ( 1 ) {
1323 #ifdef PSNET_BUFFER_OLD_SCHOOL
1324                 int packet_id, id;
1325                 // if there are no more packet buffers that we can use, then we must bail here before reading
1326                 // any data!!!!
1327                 if ( Num_packet_buffers >= MAX_PACKET_BUFFERS ) {
1328                         nprintf(("Network", "Packet buffer overrun in psnet_get()\n"));
1329                         break;
1330                 }
1331 #endif
1332
1333                 // check if there is any data on the socket to be read.  The amount of data that can be
1334                 // atomically read is stored in len.
1335
1336                 FD_ZERO(&rfds);
1337                 FD_SET( socket, &rfds );
1338                 timeout.tv_sec = 0;
1339                 timeout.tv_usec = 0;
1340
1341                 if ( select( socket+1, &rfds, NULL, NULL, &timeout) == SOCKET_ERROR ) {
1342                         nprintf(("Network", "Error %d doing a socket select on read\n", WSAGetLastError()));
1343                         break;
1344                 }
1345
1346                 // if the read file descriptor is not set, then bail!
1347                 if ( !FD_ISSET(socket, &rfds ) )
1348                         return;
1349
1350                 // get data off the socket and process
1351                 read_len = SOCKET_ERROR;
1352                 switch ( Socket_type ) {
1353                 case NET_TCP:
1354                         from_len = sizeof(struct sockaddr_in);
1355                         if(flags & PSNET_FLAG_RAW){
1356                                 read_len = recvfrom( socket, (char*)packet_read.data, MAX_PACKET_SIZE, 0,  (struct sockaddr*)&ip_addr, &from_len );
1357                         } else {
1358                                 read_len = recvfrom( socket, (char *)&packet_read, sizeof(packet_data), 0,  (struct sockaddr*)&ip_addr, &from_len );
1359                         }
1360                         break;
1361
1362                 default:
1363                         Int3();
1364                         break;
1365                 }
1366
1367                 // set the from_addr for storage into the packet buffer structure
1368                 from_addr.type = Socket_type;
1369
1370                 switch ( Socket_type ) {
1371                 case NET_TCP:
1372                         if(socket == Reliable_socket){
1373                                 from_addr.port = Psnet_default_port;
1374                         } else {
1375                                 from_addr.port = ntohs( ip_addr.sin_port );
1376                         }
1377                         memset(from_addr.addr, 0x00, IP_ADDRESS_LENGTH);
1378                         memcpy(from_addr.addr, &ip_addr.sin_addr.s_addr, 4);
1379                         break;
1380
1381                 default:
1382                         SDL_assert(0);
1383                         break;
1384                 }
1385
1386                 if ( read_len == SOCKET_ERROR ) {
1387                         int x = WSAGetLastError();
1388                         nprintf(("Network", "Read error on socket.  Winsock error %d \n", x));
1389                         break;
1390                 }
1391
1392 #ifndef PSNET_RELIABLE_OLD_SCHOOL
1393                 int shave_size;
1394                 // now we check to see if this is a reliable packet, and act accordindly
1395                 if(socket == Reliable_socket){
1396                         // this function processes the incoming packet, and determines if the system should continue to process the data
1397                         shave_size = psnet_reliable_should_process(&from_addr,packet_read.data,read_len);
1398                         if(!shave_size){
1399                                 continue;
1400                         } else {
1401                                 // copy in from data+2, so we skip the reliable data header
1402                                 memcpy(packet_data.data,packet_read.data + shave_size,read_len);
1403
1404                                 // subtract out the size of the reliable header
1405                                 read_len -= shave_size;
1406                         }
1407                 } else {
1408                         memcpy(packet_data.data,packet_read.data,read_len);
1409                 }
1410 #else
1411                 memcpy(packet_data.data,packet_read.data,read_len);
1412 #endif
1413
1414 #ifdef PSNET_BUFFER_OLD_SCHOOL
1415                 ubyte           *data;
1416                 int len;
1417
1418                 // if we had no error reading from the socket, then determine if we need to calculate a
1419                 // checksum on the packet
1420                 if ( !(flags & PSNET_FLAG_RAW) && (packet_data.flags & PSNET_FLAG_CHECKSUM) ) {
1421                         ushort checksum;
1422
1423                         // calculate the size of the data that is actual real data
1424                         len = read_len - (sizeof(packet_data) - MAX_CHECKSUM_PACKET_SIZE);
1425                         checksum = psnet_calc_checksum( packet_data.data, len );
1426                         if ( checksum != packet_data.checksum ) {
1427                                 nprintf(("Network", "bad checksum on incoming packet -- discarding\n"));
1428                                 return;
1429                         }
1430                         data = packet_data.data;
1431                         packet_id = packet_data.sequence_number;
1432                 } else {
1433                         network_naked_packet *packet;
1434
1435                         // just read in the raw socket data and length
1436                         if(flags & PSNET_FLAG_RAW){
1437                                 data = packet_data.data;
1438                                 len = read_len;
1439
1440                                 packet_id = 0;
1441                         } else {
1442                                 // we don't have a checksum packet.  cast the data to the naked packet type and
1443                                 // copy it over to passed parameters
1444                                 packet = (network_naked_packet *)&packet_data;
1445
1446                                 len = read_len - (sizeof(network_naked_packet) - MAX_PACKET_SIZE);
1447                                 data = packet->data;
1448
1449                                 packet_id = packet->sequence_number;
1450                         }
1451                 }
1452
1453                 // look at the sequence number compared to what we last received
1454                 if ( Last_packet_id > -1 ) {
1455                         if ( packet_id != (Last_packet_id+1) ) {
1456                                 //if ( packet_id < Last_packet_id )
1457                                 //      nprintf(("network", "packet %d came in delayed (last id was %d\n", packet_id, Last_packet_id));
1458                                 //else if ( packet_id > (Last_packet_id+1) )
1459                                 //      nprintf(("Network", "missed %d packet(s).  last id %d.  This id %d\n", (packet_id - Last_packet_id), Last_packet_id, packet_id));
1460                         }
1461                 }
1462                 Last_packet_id = packet_id;
1463
1464 #ifndef NDEBUG
1465                 psnet_do_net_stats( &from_addr, read_len, 1 );
1466                 psnet_bytes_read_frame += read_len;
1467 #endif
1468
1469                 // put all of the data (length, who from, etc.) into the next available packet buffer
1470                 // slot.  We should be assured of a slot here because of the check at the beginning
1471                 // of the while loop
1472                 SDL_assert ( Num_packet_buffers < MAX_PACKET_BUFFERS );
1473                 id = packet_free_list[ Num_packet_buffers++ ];
1474                 if (id > Largest_packet_index ) Largest_packet_index = id;
1475                 packet_buffers[id].len = len;           // use the flags field of the packet structure to hold the data length
1476                 packet_buffers[id].sequence_number =  packet_id;
1477                 packet_buffers[id].from_addr = from_addr;
1478                 memcpy( packet_buffers[id].data, data, len );
1479 #else
1480 #ifndef NDEBUG
1481                 psnet_do_net_stats( &from_addr, read_len, 1 );
1482                 psnet_bytes_read_frame += read_len;
1483 #endif
1484
1485                 // buffer the packet
1486                 psnet_buffer_packet(packet_data.data,read_len,&from_addr);
1487 #endif
1488         }
1489 }
1490
1491 // -------------------------------------------------------------------------------------------------
1492 // psnet_send()
1493 //
1494 //
1495
1496 int psnet_send( net_addr_t * who_to, void * data, int len, int flags, int reliable_socket )
1497 {
1498
1499         SOCKET send_sock;
1500         struct sockaddr_in sockaddr;                            // UDP/TCP socket structure
1501         int ret, send_len;
1502         ubyte iaddr[IP_ADDRESS_LENGTH], *send_data;
1503         short port;
1504         fd_set  wfds;
1505         struct timeval timeout;
1506
1507         if(!reliable_socket){
1508                 send_sock = Unreliable_socket;
1509         } else {
1510                 send_sock = Reliable_socket;
1511         }
1512
1513         if ( Network_status != NETWORK_STATUS_RUNNING ) {
1514                 nprintf(("Network","Network ==> Socket not inited in psnet_send\n"));
1515                 return 0;
1516         }
1517
1518         if ( psnet_same( who_to, &Psnet_my_addr) ){
1519                 return 0;
1520         }
1521
1522         memset(iaddr, 0x00, IP_ADDRESS_LENGTH);
1523         memcpy(iaddr, who_to->addr, IP_ADDRESS_LENGTH);
1524
1525         if ( memcmp(iaddr, Null_address, IP_ADDRESS_LENGTH) == 0) {
1526                 nprintf(("Network","Network ==> send to address is 0 in psnet_send\n"));
1527                 return 0;
1528         }
1529
1530         if(send_sock == Unreliable_socket){
1531                 port = who_to->port;
1532         } else if(send_sock == Reliable_socket){
1533                 port = DEFAULT_GAME_PORT + 1;
1534         } else {
1535                 port = who_to->port;
1536         }
1537
1538         if ( port == 0) {
1539                 nprintf(("Network","Network ==> destination port %d invalid in psnet_send\n", port));
1540                 return 0;
1541         }
1542
1543 #ifdef PSNET_BUFFER_OLD_SCHOOL
1544         network_checksum_packet         Send_network_checksum_packet;
1545         network_naked_packet                    Send_network_naked_packet;
1546
1547         // determine from the flags whether or not this packet should have a checksum.
1548         if ( flags & PSNET_FLAG_CHECKSUM ) {
1549                 // can't send raw data with a checksum, dumbass!
1550                 SDL_assert(!(flags & PSNET_FLAG_RAW));
1551
1552                 Send_network_checksum_packet.sequence_number = Next_packet_id++;
1553                 Send_network_checksum_packet.flags = PSNET_FLAG_CHECKSUM;
1554
1555                 Send_network_checksum_packet.checksum = psnet_calc_checksum(data, len);
1556                 memcpy( Send_network_checksum_packet.data, data, len );
1557                 send_len = sizeof(Send_network_checksum_packet) - MAX_CHECKSUM_PACKET_SIZE + len;
1558                 send_data = (ubyte *)&Send_network_checksum_packet;
1559         } else {
1560                 // send standard psnet stuff
1561                 if(!(flags & PSNET_FLAG_RAW)){
1562                         Send_network_naked_packet.sequence_number = Next_packet_id++;
1563                         Send_network_naked_packet.flags = 0;
1564
1565                         memcpy(Send_network_naked_packet.data, data, len);
1566                         send_len = sizeof(Send_network_naked_packet) - MAX_PACKET_SIZE + len;           // gets us the real size of the structure
1567                         send_data = (ubyte *)&Send_network_naked_packet;
1568                 }
1569                 // send raw data
1570                 else {
1571                         send_data = (ubyte*)data;
1572                         send_len = len;
1573                 }
1574         }
1575 #else
1576         send_data = (ubyte*)data;
1577         send_len = len;
1578 #endif
1579
1580
1581         FD_ZERO(&wfds);
1582         FD_SET( send_sock, &wfds );
1583         timeout.tv_sec = 0;
1584         timeout.tv_usec = 0;
1585
1586         if ( select( send_sock+1, NULL, &wfds, NULL, &timeout) == SOCKET_ERROR ) {
1587                 nprintf(("Network", "Error on blocking select for write %d\n", WSAGetLastError() ));
1588                 return 0;
1589         }
1590
1591         // if the write file descriptor is not set, then bail!
1592         if ( !FD_ISSET(send_sock, &wfds ) )
1593                 return 0;
1594
1595         ret = SOCKET_ERROR;
1596         switch ( who_to->type ) {
1597
1598                 case NET_TCP:
1599                         sockaddr.sin_family = AF_INET;
1600                         memcpy(&sockaddr.sin_addr.s_addr, iaddr, 4);
1601                         sockaddr.sin_port = htons(port);
1602
1603                         ret = sendto( send_sock, (char *)send_data, send_len, 0, (struct sockaddr*)&sockaddr, sizeof(sockaddr) );
1604                         break;
1605
1606                 default:
1607                         SDL_assert(0);  // unknown protocol
1608                         break;
1609
1610         } // end switch
1611
1612         if ( ret != SOCKET_ERROR )      {
1613 #ifndef NDEBUG
1614                 psnet_bytes_written_frame += send_len;
1615                 psnet_do_net_stats( who_to, send_len, 0 );
1616 #endif
1617                 return 1;
1618         }
1619         //Warning( LOCATION, "Couldn't send data (0x%x)!\n", WSAGetLastError() );
1620         return 0;
1621 }
1622
1623 #ifdef PSNET_BUFFER_OLD_SCHOOL
1624 // routine to "free" a packet buffer
1625 void free_packet( int id )
1626 {
1627         packet_buffers[id].sequence_number = -1;
1628         packet_free_list[ --Num_packet_buffers ] = (short)id;
1629         if ( Largest_packet_index == id)
1630                 while ((--Largest_packet_index>0) && (packet_buffers[Largest_packet_index].sequence_number == -1 ));
1631 }
1632 #endif
1633
1634 #ifdef PSNET_RELIABLE_OLD_SCHOOL
1635 // psnet_send_reliable sends the given data through the given reliable socket.
1636
1637 #define MAX_RSEND_BUFFER                2048
1638 ubyte rsend_buffer[MAX_RSEND_BUFFER];
1639
1640 int psnet_rel_send( PSNET_SOCKET psocket, ubyte *data, int length, int flags )
1641 {
1642         ubyte *send_data;
1643         int num_sent, total_sent, error, retries;
1644         SOCKET socket;
1645         unsigned short s_length;
1646
1647         socket = (SOCKET)psocket;
1648
1649         // basic checks
1650         if ( Network_status != NETWORK_STATUS_RUNNING ) {
1651                 nprintf(("Network","Network ==> Socket not inited in psnet_send\n"));
1652                 return 0;
1653         }
1654
1655         if ( socket == (SOCKET)INVALID_SOCKET )         // might happen in race conditions -- should get cleaned up.
1656                 return 0;
1657
1658         SDL_assert( length < MAX_RSEND_BUFFER );
1659
1660         // copy the length of the data into the beginning of the buffer.  then put the data into the buffer
1661         // after the length value
1662         SDL_assert( length > 0 );
1663         s_length = (ushort)length;
1664         memcpy( &rsend_buffer[0], &s_length, sizeof(s_length) );
1665         memcpy( &rsend_buffer[2], data, length );
1666
1667         retries = 0;
1668         total_sent = 0;
1669         send_data = data;
1670         do {
1671                 num_sent = send( socket, (char *)rsend_buffer, length+sizeof(s_length), 0 );
1672                 if ( num_sent == SOCKET_ERROR ) {
1673                         error = WSAGetLastError();
1674                         if ( !NETCALL_WOULDBLOCK(error) || (retries > MAX_SEND_RETRIES) )       {               // means that we would block on send -- not really an error
1675
1676                                 // if error is would block, then set error to aborted connection
1677                                 if ( NETCALL_WOULDBLOCK(error) )
1678                                         error = WSAECONNABORTED;
1679
1680                                 multi_eval_socket_error(socket, error);
1681                                 return 0;
1682                         }
1683                         retries++;                                                                                      // keep a try count
1684                 } else {
1685                         length -= num_sent;
1686                         send_data += num_sent;
1687                         total_sent += num_sent;
1688                 }
1689         } while ( length > 0 );
1690
1691 #ifndef NDEBUG
1692         psnet_bytes_written_frame += total_sent;
1693
1694         //int index;
1695         //index = psnet_find_stats_loc( who_to );
1696         //if ( index != -1 )
1697         //      Psnet_stats[index].total_written += send_len;
1698 #endif
1699         return 1;
1700 }
1701
1702 // get data off the reliable socket
1703 int psnet_rel_get( PSNET_SOCKET psocket, ubyte *buffer, int max_len, int flags)
1704 {
1705         int from_len, total_read, error;
1706         SOCKET socket;
1707         fd_set rfds;
1708         struct timeval timeout;
1709         short read_len;
1710         ubyte rread_buffer[2];
1711
1712         socket = (SOCKET)psocket;
1713
1714         // see if there is data to be read
1715         FD_ZERO(&rfds);
1716         FD_SET( socket, &rfds );
1717         timeout.tv_sec = 0;
1718         timeout.tv_usec = 0;
1719
1720         if ( select( socket+1, &rfds, NULL, NULL, &timeout) == SOCKET_ERROR ) {
1721                 nprintf(("Network", "Error on select for read reliable: %d\n", WSAGetLastError() ));
1722                 return 0;
1723         }
1724
1725         // if no data, then we can leave.
1726         if ( !FD_ISSET(socket, &rfds ) )
1727                 return 0;
1728
1729         // we know we have data to read.  We must read the two byte length of the packet first
1730         total_read = 0;
1731         read_len = 2;
1732         do {
1733                 from_len = recv(socket, (char *)(&rread_buffer[total_read]), read_len - total_read, 0);
1734
1735                 // from_len will be 0 when back end gracefully closes connection.  We will assume that since
1736                 // the close is graceful, we will info from him telling us he's left.  So we'll ignore
1737                 // this condition here.
1738                 if ( from_len == 0 ) {
1739                         nprintf(("Network", "Dumping player because recv returned 0\n"));
1740                         multi_eval_socket_error( socket, WSAECONNRESET );               // this error drops player from game.
1741                         return 0;
1742                 }
1743
1744                 // on a socket error, we need to check for WSAEWOULDBLOCK meaning that there is no more
1745                 // data to be read.
1746                 else if ( from_len == SOCKET_ERROR ) {
1747                         error = WSAGetLastError();
1748                         if ( !NETCALL_WOULDBLOCK(error) )
1749                                 multi_eval_socket_error( socket, error );
1750                         return 0;               // get it next frame?
1751                 }
1752
1753                 total_read += from_len;
1754         } while ( total_read < read_len );
1755
1756
1757         total_read = 0;
1758         memcpy(&read_len, &rread_buffer[0], 2);
1759         SDL_assert( (read_len > 0) && (read_len < max_len) );
1760         if ( read_len == 0 )
1761                 return 0;
1762
1763         do {
1764                 from_len = recv(socket, (char *)(buffer + total_read), read_len - total_read, 0);
1765
1766                 // from_len will be 0 when back end gracefully closes connection.  We will assume that since
1767                 // the close is graceful, we will info from him telling us he's left.  So we'll ignore
1768                 // this condition here.
1769                 if ( from_len == 0 ) {
1770                         nprintf(("Network", "Dumping player because recv returned 0\n"));
1771                         multi_eval_socket_error( socket, WSAECONNRESET );               // this error drops player from game.
1772                         return 0;
1773                 }
1774
1775                 // on a socket error, we need to check for WSAEWOULDBLOCK meaning that there is no more
1776                 // data to be read.
1777                 else if ( from_len == SOCKET_ERROR ) {
1778                         error = WSAGetLastError();
1779                         if ( !NETCALL_WOULDBLOCK(error) ) {
1780                                 multi_eval_socket_error( socket, error );
1781                                 return 0;
1782                         }
1783                         continue;
1784                 }
1785
1786                 total_read += from_len;
1787         } while ( total_read < read_len );
1788
1789         return total_read;
1790 }
1791 #else
1792 // psnet_send_reliable sends the given data through the given reliable socket.
1793 int psnet_send_reliable( PSNET_SOCKET psocket, ubyte *data, int length, int flags )
1794 {
1795         // don't do anything if the socket is null
1796         if(psocket == NULL){
1797                 return 0;
1798         }
1799
1800         // send a reliable data packet
1801         return psnet_reliable_send(data,length,(net_addr_t*)psocket);
1802 }
1803
1804 int psnet_get_reliable( PSNET_SOCKET psocket, ubyte *buffer, int max_len, int flags)
1805
1806 {
1807         int best, best_id, i, n, size;
1808
1809         // call the routine to read data out of the socket (which stuffs it into the packet buffers)
1810         psnet_get_socket_data(Reliable_socket,flags);
1811
1812 #ifdef PSNET_BUFFER_OLD_SCHOOL
1813         // now determine which (if any) of the packet buffers we should look at!
1814         best = -1;
1815         n = 0;
1816         best_id = -1;
1817
1818         for (i=0; i <= Largest_packet_index; i++ )      {
1819                 if ( packet_buffers[i].sequence_number > -1 ) {
1820                         n++;
1821                         if ( best == -1 || (packet_buffers[i].sequence_number < best) ) {
1822                                 best = packet_buffers[i].sequence_number;
1823                                 best_id = i;
1824                         }
1825                 }
1826         }
1827
1828         //mprintf( (0, "Best id = %d, pn = %d, last_ecb = %x, len=%x, ne = %d\n", best_id, best, last_ecb, lastlen, neterrors ));
1829         //mprintf( (1, "<%d> ", neterrors ));
1830
1831         if ( best_id < 0 ) return 0;
1832
1833         size = packet_buffers[best_id].len;
1834         memcpy( buffer, packet_buffers[best_id].data, size );
1835         memcpy( psocket, &packet_buffers[best_id].from_addr, sizeof(net_addr_t) );
1836         free_packet(best_id);
1837
1838         return size;
1839 #else
1840         return 0;
1841 #endif
1842 }
1843 #endif
1844
1845 // function which checks the Listen_socket for possibly incoming requests to be connected.
1846 // returns 0 on error or nothing waiting.  1 if we should try to accept
1847 int psnet_rel_check_for_listen(net_addr_t *from_addr)
1848 {
1849         fd_set  rfds;
1850         timeval timeout;
1851         SOCKET  sock;                           // when trying to accept, this is new socket
1852         struct sockaddr_in ip_addr;                             // UDP/TCP socket structure
1853 #ifndef PLAT_UNIX
1854         int from_len;
1855 #else
1856         socklen_t from_len;
1857 #endif
1858         int error;
1859         unsigned long arg;
1860
1861         FD_ZERO(&rfds);
1862         FD_SET( Listen_socket, &rfds );
1863         timeout.tv_sec = 0;
1864         timeout.tv_usec = 0;
1865
1866         if ( select(Listen_socket+1, &rfds, NULL, NULL, &timeout) == SOCKET_ERROR ) {
1867                 nprintf(("Network", "Error %d doing select on listen socket\n", WSAGetLastError() ));
1868                 return 0;
1869         }
1870
1871         // check to see if Listen_socket has something -- if not, return
1872         if ( !FD_ISSET(Listen_socket, &rfds) )
1873                 return INVALID_SOCKET;
1874
1875         sock = INVALID_SOCKET;
1876         switch ( Socket_type ) {
1877         case NET_TCP:
1878                 from_len = sizeof(struct sockaddr_in);
1879                 sock = accept( Listen_socket, (struct sockaddr*)&ip_addr, &from_len );
1880                 from_addr->port = ntohs( ip_addr.sin_port );
1881                 memset(from_addr->addr, 0x00, IP_ADDRESS_LENGTH);
1882                 memcpy(from_addr->addr, &ip_addr.sin_addr.s_addr, 4);
1883                 nprintf(("Network","Accepted TCP connected!!\n"));
1884                 break;
1885
1886         default:
1887                 Int3();
1888                 break;
1889         }
1890
1891         if ( !psnet_get_ip(sock) ) {
1892                 return INVALID_SOCKET;
1893         }
1894
1895         // make the new socket non-blocking
1896         if(sock != (SOCKET)INVALID_SOCKET){
1897                 arg = TRUE;
1898                 error = ioctlsocket( sock, FIONBIO, &arg );
1899                 if ( error == SOCKET_ERROR ) {
1900                         nprintf(("Network", "Unable to make accepted socket non-blocking -- %d", WSAGetLastError() ));
1901                         return INVALID_SOCKET;
1902                 }
1903         }
1904
1905         return sock;
1906
1907 }
1908
1909 int psnet_rel_get_status(PSNET_SOCKET psocket)
1910 {
1911         int error_code;
1912 #ifndef PLAT_UNIX
1913         int error_code_size = sizeof(error_code);
1914 #else
1915         socklen_t error_code_size = sizeof(error_code);
1916 #endif
1917         SOCKET socket;
1918
1919         socket = (SOCKET)psocket;
1920
1921         if ( getsockopt(socket, SOL_SOCKET, SO_ERROR, &error_code, &error_code_size) ) {
1922                 return RNF_BROKEN;
1923         }
1924
1925         if ( !error_code ) {
1926                 return RNF_CONNECTED;
1927         }
1928
1929         if ( NETCALL_WOULDBLOCK(error_code) ) {
1930                 return RNF_CONNECTING;
1931         }
1932
1933         return RNF_DISCONNECTED;
1934 }
1935
1936 // psnet_get() will call the above function to read data out of the socket.  It will then determine
1937 // which of the buffers we should use and pass to the routine which called us
1938 int psnet_get( void * data, net_addr_t* from_addr, int flags )
1939 {
1940         // USE THIS CODE TO TEST NON-BUFFERED SOCKET READS. OUT-OF-ORDER PACKETS DROP TO NEARLY 0
1941         // - Dave
1942         /*
1943         fd_set  rfds;
1944         timeval timeout;
1945         int read_len,from_len;
1946         struct sockaddr_in ip_addr;
1947         FD_ZERO(&rfds);
1948         FD_SET( Unreliable_socket, &rfds );
1949         timeout.tv_sec = 0;
1950         timeout.tv_usec = 0;
1951
1952         if ( select( Unreliable_socket+1, &rfds, NULL, NULL, &timeout) == SOCKET_ERROR ) {
1953                 nprintf(("Network", "Error %d doing a socket select on read\n", WSAGetLastError()));
1954                 return 0;
1955         }
1956
1957         // if the read file descriptor is not set, then bail!
1958         if ( !FD_ISSET(Unreliable_socket, &rfds ) )
1959                 return 0;
1960
1961         // get data off the socket and process
1962         read_len = SOCKET_ERROR;
1963         from_len = sizeof(struct sockaddr_in);
1964         read_len = recvfrom( Unreliable_socket, (char*)data, MAX_PACKET_SIZE, 0,  (struct sockaddr*)&ip_addr, &from_len );
1965         from_addr->port = ntohs( ip_addr.sin_port );
1966         memset(from_addr->addr, 0x00, 6);
1967         memcpy(from_addr->addr, &ip_addr.sin_addr.S_un.S_addr, 4);
1968         return read_len;
1969         */
1970
1971         // call the routine to read data out of the socket (which stuffs it into the packet buffers)
1972         psnet_get_socket_data(Unreliable_socket,flags);
1973
1974 #ifdef PSNET_BUFFER_OLD_SCHOOL
1975         int best, best_id, i, n, size;
1976
1977         // now determine which (if any) of the packet buffers we should look at!
1978         best = -1;
1979         n = 0;
1980         best_id = -1;
1981
1982         for (i=0; i <= Largest_packet_index; i++ )      {
1983                 if ( packet_buffers[i].sequence_number > -1 ) {
1984                         n++;
1985                         if ( best == -1 || (packet_buffers[i].sequence_number < best) ) {
1986                                 best = packet_buffers[i].sequence_number;
1987                                 best_id = i;
1988                         }
1989                 }
1990         }
1991
1992         //mprintf( (0, "Best id = %d, pn = %d, last_ecb = %x, len=%x, ne = %d\n", best_id, best, last_ecb, lastlen, neterrors ));
1993         //mprintf( (1, "<%d> ", neterrors ));
1994
1995         if ( best_id < 0 ) return 0;
1996
1997         size = packet_buffers[best_id].len;
1998         memcpy( data, packet_buffers[best_id].data, size );
1999         memcpy( from_addr, &packet_buffers[best_id].from_addr, sizeof(net_addr_t) );
2000         free_packet(best_id);
2001
2002         return size;
2003 #else
2004         int buffer_size;
2005
2006         // try and get a free buffer and return its size
2007         if(psnet_buffer_get_next((ubyte*)data,&buffer_size,from_addr)){
2008                 return buffer_size;
2009         }
2010
2011         // return nothing
2012         return 0;
2013 #endif
2014 }
2015
2016
2017
2018 // -------------------------------------------------------------------------------------------------
2019 // psnet_broadcast()
2020 //
2021 //
2022
2023 int psnet_broadcast( net_addr_t * who_to, void * data, int len, int flags )
2024 {
2025         if ( Network_status != NETWORK_STATUS_RUNNING ) {
2026                 nprintf(("Network","Network ==> Socket not inited in psnet_broadcast\n"));
2027                 return 0;
2028         }
2029
2030         if ( !Can_broadcast ) {
2031                 nprintf(("Network", "Cannot broadcast -- returning without doing anything\n"));
2032                 return 0;
2033         }
2034
2035         ubyte broadcast[IP_ADDRESS_LENGTH] = {0xff, 0xff, 0xff, 0xff};
2036
2037         // broadcasting works on a local subnet which is all we really want to do for now anyway.
2038         // we might keep this in as an option for freespace later.
2039         switch ( who_to->type ) {
2040                 case NET_TCP:
2041
2042                         memcpy(who_to->addr, broadcast, IP_ADDRESS_LENGTH);
2043                         psnet_send(who_to, data, len, flags);
2044                         break;
2045
2046         } // end switch
2047
2048         return 1;
2049 }
2050
2051 // called to clear out the socket of any remaining data
2052
2053 void psnet_flush()
2054 {
2055         ubyte data[MAX_PACKET_SIZE];
2056         net_addr_t from_addr;
2057
2058         while ( psnet_get( data, &from_addr ) > 0 ) ;
2059 }
2060
2061
2062
2063 #ifndef NDEBUG
2064 // function to keep track of bytes read/written on average during the frame
2065 void psnet_calc_socket_stats()
2066 {
2067         if ( psnet_frame_int == -1 )    {
2068                 int i;
2069                 for ( i = 0; i < PSNET_FRAME_FILTER; i++ ) {
2070                         psnet_read_sizes[i] = 0;
2071                         psnet_write_sizes[i] = 0;
2072                 }
2073                 psnet_read_total = 0;
2074                 psnet_write_total = 0;
2075                 psnet_frame_int = 0;
2076         }
2077         psnet_read_total -= psnet_read_sizes[psnet_frame_int];
2078         psnet_write_total -= psnet_write_sizes[psnet_frame_int];
2079
2080         psnet_read_total += psnet_bytes_read_frame;
2081         psnet_write_total += psnet_bytes_written_frame;
2082
2083         psnet_read_sizes[psnet_frame_int] = psnet_bytes_read_frame;
2084         psnet_write_sizes[psnet_frame_int] = psnet_bytes_written_frame;
2085
2086         psnet_frame_int = (psnet_frame_int + 1 ) % PSNET_FRAME_FILTER;
2087
2088         if ( psnet_frame_count > 0 )    {
2089                 if ( psnet_frame_count >= PSNET_FRAME_FILTER )
2090                         Psnet_bytes_read = psnet_read_total / PSNET_FRAME_FILTER;
2091                 else
2092                         Psnet_bytes_read = psnet_read_total / psnet_frame_count;
2093
2094                 if ( psnet_frame_count >= PSNET_FRAME_FILTER )
2095                         Psnet_bytes_written = psnet_write_total / PSNET_FRAME_FILTER;
2096                 else
2097                         Psnet_bytes_written = psnet_write_total / psnet_frame_count;
2098         }
2099
2100         psnet_frame_count++;
2101         psnet_bytes_read_frame = 0;
2102         psnet_bytes_written_frame = 0;
2103 }
2104 #endif
2105
2106 int psnet_is_valid_numeric_ip(char *ip)
2107 {
2108         char *token;
2109         char copy[100];
2110         int val1,val2,val3,val4;
2111
2112         // get the first ip value
2113         SDL_strlcpy(copy, ip, SDL_arraysize(copy));
2114         token = strtok(copy,".");
2115         if(token == NULL){
2116                 return 0;
2117         } else {
2118                 // get the value of the token
2119                 val1 = atoi(token);
2120                 if((val1 < 0) || (val1 > 255)){
2121                         return 0;
2122                 }
2123         }
2124
2125         // second ip value
2126         token = strtok(NULL,".");
2127         if(token == NULL){
2128                 return 0;
2129         } else {
2130                 // get the value of the token
2131                 val2 = atoi(token);
2132                 if((val2 < 0) || (val2 > 255)){
2133                         return 0;
2134                 }
2135         }
2136
2137         // third ip value
2138         token = strtok(NULL,".");
2139         if(token == NULL){
2140                 return 0;
2141         } else {
2142                 // get the value of the token
2143                 val3 = atoi(token);
2144                 if((val3 < 0) || (val3 > 255)){
2145                         return 0;
2146                 }
2147         }
2148
2149         // third ip value
2150         token = strtok(NULL,"");
2151         if(token == NULL){
2152                 return 0;
2153         } else {
2154                 // get the value of the token
2155                 val4 = atoi(token);
2156                 if((val4 < 0) || (val4 > 255)){
2157                         return 0;
2158                 }
2159         }
2160
2161         // make sure he hasn't entered all 0's
2162         if((val1 == 0) && (val2 == 0) && (val3 == 0) && (val4 == 0)){
2163                 return 0;
2164         }
2165
2166         // valid
2167         return 1;
2168 }
2169
2170
2171 // returns true or false if the given string is a valid ip string or not.
2172 // allow port allows us to append the port number on the end of the ip string with
2173 // <addr>:<port#>
2174 // so we must be sure to remove the port number
2175 int psnet_is_valid_ip_string( char *ip_string, int allow_port )
2176 {
2177         in_addr addr;
2178         struct hostent *host_ent;
2179         char str[255], *c;
2180
2181         // our addresses may have ports, so make local copy and remove port number
2182         SDL_assert( strlen(ip_string) < 255 );
2183         SDL_strlcpy(str, ip_string, SDL_arraysize(str));
2184         c = strrchr(str, ':');
2185         if ( c ){
2186                 *c = '\0';
2187         }
2188
2189         addr.s_addr = inet_addr(ip_string);
2190         if ( addr.s_addr != INADDR_NONE ){
2191                 // make sure the ip string is a valid format string
2192                 if(psnet_is_valid_numeric_ip(ip_string)){
2193                         return 1;
2194                 }
2195         }
2196
2197         // try name resolution
2198         host_ent = gethostbyname( ip_string );
2199         if ( !host_ent ){
2200                 return 0;
2201         }
2202
2203         // valid host entry so return 1;
2204         return 1;
2205 }
2206
2207
2208 // ------------------------------------------------------------------------------------------------------
2209 // PACKET BUFFERING FUNCTIONS
2210 //
2211
2212 #ifndef PSNET_BUFFER_OLD_SCHOOL
2213
2214 // a sequence number of -1 will indicate that this packet is not valid
2215 static network_packet_buffer Psnet_buffers[MAX_PACKET_BUFFERS];
2216 static int Psnet_seq_number = 0;
2217 static int Psnet_lowest_id = 0;
2218 static int Psnet_highest_id = 0;
2219
2220 // initialize the buffering system
2221 void psnet_buffer_init()
2222 {
2223         int idx;
2224
2225         // blast the buffer clean
2226         memset(Psnet_buffers,0,sizeof(network_packet_buffer) * MAX_PACKET_BUFFERS);
2227
2228         // set all buffer sequence #'s to -1
2229         for(idx=0;idx<MAX_PACKET_BUFFERS;idx++){
2230                 Psnet_buffers[idx].sequence_number = -1;
2231         }
2232
2233         // initialize the sequence #
2234         Psnet_seq_number = 0;
2235         Psnet_lowest_id = -1;
2236         Psnet_highest_id = -1;
2237 }
2238
2239 // buffer a packet (maintain order!)
2240 void psnet_buffer_packet(ubyte *data, int length, net_addr_t *from)
2241 {
2242         int idx;
2243         int found_buf = 0;
2244
2245         // find the first empty packet
2246         for(idx=0;idx<MAX_PACKET_BUFFERS;idx++){
2247                 if(Psnet_buffers[idx].sequence_number == -1){
2248                         found_buf = 1;
2249                         break;
2250                 }
2251         }
2252
2253         // if we didn't find the buffer, report an overrun
2254         if(!found_buf){
2255                 nprintf(("Network","WARNING - Buffer overrun in psnet\n"));
2256         } else {
2257                 // copy in the data
2258                 memcpy(Psnet_buffers[idx].data,data,length);
2259                 Psnet_buffers[idx].len = length;
2260                 memcpy(&Psnet_buffers[idx].from_addr,from,sizeof(net_addr_t));
2261                 Psnet_buffers[idx].sequence_number = Psnet_seq_number;
2262
2263                 // keep track of the highest id#
2264                 Psnet_highest_id = Psnet_seq_number++;
2265
2266                 // set the lowest id# for the first time
2267                 if(Psnet_lowest_id == -1){
2268                         Psnet_lowest_id = Psnet_highest_id;
2269                 }
2270         }
2271 }
2272
2273 // get the index of the next packet in order!
2274 int psnet_buffer_get_next(ubyte *data, int *length, net_addr_t *from)
2275 {
2276         int idx;
2277         int found_buf = 0;
2278
2279         // if there are no buffers, do nothing
2280         if((Psnet_lowest_id == -1) || (Psnet_lowest_id > Psnet_highest_id)){
2281                 return 0;
2282         }
2283
2284         // search until we find the lowest packet index id#
2285         for(idx=0;idx<MAX_PACKET_BUFFERS;idx++){
2286                 // if we found the buffer
2287                 if(Psnet_buffers[idx].sequence_number == Psnet_lowest_id){
2288                         found_buf = 1;
2289                         break;
2290                 }
2291         }
2292
2293         // at this point, we should _always_ have found the buffer
2294         SDL_assert(found_buf);
2295
2296         // copy out the buffer data
2297         memcpy(data,Psnet_buffers[idx].data,Psnet_buffers[idx].len);
2298         *length = Psnet_buffers[idx].len;
2299         memcpy(from,&Psnet_buffers[idx].from_addr,sizeof(net_addr_t));
2300
2301         // now we need to cleanup the packet list
2302
2303         // mark the buffer as free
2304         Psnet_buffers[idx].sequence_number = -1;
2305         Psnet_lowest_id++;
2306
2307         return 1;
2308 }
2309
2310 #else
2311
2312 // initialize the buffering system
2313 void psnet_buffer_init() {}
2314
2315 // buffer a packet (maintain order!)
2316 void psnet_buffer_packet(ubyte *data, int length) {}
2317
2318 // get the index of the next packet in order!
2319 int psnet_buffer_get_next() {   return -1; }
2320
2321 #endif
2322
2323 // ------------------------------------------------------------------------------------------------------
2324 // RELIABLE UDP FUNCTIONS
2325 //
2326
2327 // verbose debug output
2328 #define PSNET_RELIABLE_VERBOSE
2329
2330 // overall buffer space allocated to the buffers
2331 #define PSNET_RELIABLE_MAX_OUT_BUFFER_SIZE                                                      (1<<18)                 // 256k
2332 #define PSNET_RELIABLE_MAX_IN_BUFFER_SIZE                                                               (1<<12)                 // 4k
2333
2334 // outgoing reliable packets
2335 typedef struct reliable_packet_out {
2336         ubyte                   data[MAX_PACKET_SIZE];                                  // data in the original packet
2337         ushort          packet_size;                                                            // size of the original packet
2338         ushort          player_flags;                                                           // bitflags indexing (1<<N) into the Psnet_reliable_addr[N] array
2339         ushort          player_acks;                                                            // bitflags indexing (1<<N) into the Psnet_reliable_addr[N] array
2340         int                     player_stamps[MAX_PLAYERS];                     // timeouts for each player
2341         ubyte                   num_resends[MAX_PLAYERS];                               // # of times we've resent to a given player
2342         ushort          out_id;                                                                         // identifier of the packet
2343         fix                     age;                                                                                    // how old this packet is
2344 } reliable_packet_out;
2345
2346 // incoming reliable packets
2347 typedef struct reliable_packet_in {
2348         ushort          in_id;                                                                          // identifier of the received packet
2349         fix                     age;                                                                                    // when we received the packet
2350 } reliable_packet_in;
2351
2352 // # of outgoing and incoming buffers we'll allocate
2353 #define PSNET_RELIABLE_NUM_OUT_BUFFERS                                  (int)(PSNET_RELIABLE_MAX_OUT_BUFFER_SIZE / sizeof(reliable_packet_out))
2354 #define PSNET_RELIABLE_NUM_IN_BUFFERS                                   (int)(PSNET_RELIABLE_MAX_IN_BUFFER_SIZE / sizeof(reliable_packet_in))
2355
2356 // timeout to be used for the packets
2357 #define PSNET_RELIABLE_TIMEOUT                                                  1500                            // in ms
2358
2359 // # of repeats to use
2360 #define PSNET_RELIABLE_REPEAT                                                           8                                       // repeat this many times max
2361
2362 // invalid id#
2363 #define PSNET_RELIABLE_INVALID                                                  0
2364
2365 // ack code
2366 #define PSNET_RELIABLE_ACK                                                                      0xffff
2367
2368 // the outgoing and incoming buffers themselves
2369 reliable_packet_out *Psnet_reliable_out[PSNET_RELIABLE_NUM_OUT_BUFFERS];
2370 reliable_packet_in *Psnet_reliable_in[PSNET_RELIABLE_NUM_IN_BUFFERS];
2371
2372 // psnet reliable address list
2373 net_addr_t Psnet_reliable_addr[MAX_PLAYERS];                    // address of registered "reliable" addrs
2374 int Psnet_reliable_addr_flags;                                                  // bitflags indicating which of the above are valid
2375
2376 // my local identifier # (will only use lower 12 bits)
2377 ushort Psnet_reliable_local_id = 0x1;
2378
2379 // is the reliable system initialized
2380 int Psnet_reliable_inited = 0;
2381
2382 // # of times a packet has not been delivered
2383 int Psnet_reliable_fail_count = 0;
2384
2385 // # of times packets have had to be resent
2386 int Psnet_reliable_resend_count = 0;
2387
2388 // # of times we've run out of packets and had to overwrite existing ones
2389 int Psnet_reliable_overwrite_count = 0;
2390
2391 // forward declarations ------------------------------------------------------
2392
2393 // free up all used buffers
2394 void psnet_reliable_free_all_buffers();
2395
2396 // get the index of the passed address or -1 if it doesn't exist
2397 int psnet_reliable_addr_index(net_addr_t *addr);
2398
2399 // get the index into the address array from the passed bitflag
2400 int psnet_reliable_index_addr(int flags);
2401
2402 // kill all outgoing packets belonging to the passed index
2403 void psnet_reliable_kill_outgoing(int index);
2404
2405 // generate a unique id #, given the passed in value and the address it came from, return PSNET_RELIABLE_INVALID
2406 // upper 12 bytes should be valid # and the lower 4 should be free for this function to fill in
2407 ushort psnet_reliable_get_unique_id(ushort id_num,net_addr_t *from);
2408
2409 // get the upper 12 bit version of my id# and increment the original
2410 ushort psnet_reliable_get_next_id();
2411
2412 // get the index of a free outgoing relible packet buffer, killing the oldest if necessary
2413 int psnet_reliable_get_free_outgoing();
2414
2415 // get the index of a free incoming relible packet buffer, killing the oldest if necessary
2416 int psnet_reliable_get_free_incoming();
2417
2418 // actually send the data contained with the reliable_packet_out
2419 int psnet_reliable_send_packet(reliable_packet_out *out,int force_index = 0);
2420
2421 // evaluate the status of a reliable packet - and free it up if the thing is _done_
2422 void psnet_reliable_evaluate_status(reliable_packet_out *out);
2423
2424 // determine if the passed id# exists in the in-packet list, return the instance where it exists, or -1 if it doesn't
2425 int psnet_reliable_find_in_id(ushort id_num);
2426
2427 // determine if the passed id# exists in the out-packet list, return the instance where it exists, or -1 if it doesn't
2428 int psnet_reliable_find_out_id(ushort id_num);
2429
2430 // send an ack to the specified address
2431 void psnet_reliable_send_ack(net_addr_t *addr,ushort id_num);
2432
2433
2434 // extern functions -----------------------------------------------------------
2435
2436 // initialize the psnet reliable system (return 0 on fail, 1 on success)
2437 int psnet_reliable_init()
2438 {
2439         int idx;
2440
2441         // if the system is already inited, do nothing
2442         if(Psnet_reliable_inited){
2443                 return 1;
2444         }
2445
2446 #ifdef PSNET_RELIABLE_VERBOSE
2447         nprintf(("Network","PSNET RELIABLE SIZES : \n   OUT BUFFER SIZE : %d\n   OUT BUFFER COUNT %d\n   IN BUFFER SIZE %d\n   IN BUFFER COUNT %d\n",
2448                                 PSNET_RELIABLE_MAX_OUT_BUFFER_SIZE,PSNET_RELIABLE_NUM_OUT_BUFFERS,PSNET_RELIABLE_MAX_IN_BUFFER_SIZE,PSNET_RELIABLE_NUM_IN_BUFFERS));
2449 #endif
2450
2451         // null all buffers
2452         for(idx=0;idx<PSNET_RELIABLE_NUM_OUT_BUFFERS;idx++){
2453                 Psnet_reliable_out[idx] = NULL;
2454         }
2455         for(idx=0;idx<PSNET_RELIABLE_NUM_IN_BUFFERS;idx++){
2456                 Psnet_reliable_in[idx] = NULL;
2457         }
2458
2459         // initialize all outgoing buffers
2460         for(idx=0;idx<PSNET_RELIABLE_NUM_OUT_BUFFERS;idx++){
2461                 Psnet_reliable_out[idx] = NULL;
2462                 Psnet_reliable_out[idx] = (reliable_packet_out*)malloc(sizeof(reliable_packet_out));
2463
2464                 // if we failed to allocate the buffer, return failure
2465                 if(Psnet_reliable_out[idx] == NULL){
2466                         psnet_reliable_free_all_buffers();
2467                         return 0;
2468                 }
2469                 memset(Psnet_reliable_out[idx],0,sizeof(reliable_packet_out));
2470         }
2471
2472         // initialize all incoming buffers
2473         for(idx=0;idx<PSNET_RELIABLE_NUM_IN_BUFFERS;idx++){
2474                 Psnet_reliable_in[idx] = NULL;
2475                 Psnet_reliable_in[idx] = (reliable_packet_in*)malloc(sizeof(reliable_packet_in));
2476
2477                 // if we failed to allocate the buffer, return failure
2478                 if(Psnet_reliable_in[idx] == NULL){
2479                         psnet_reliable_free_all_buffers();
2480                         return 0;
2481                 }
2482                 memset(Psnet_reliable_in[idx],0,sizeof(reliable_packet_in));
2483         }
2484
2485         // blast the reliable address list free
2486         memset(Psnet_reliable_addr,0,sizeof(net_addr_t) * MAX_PLAYERS);
2487         Psnet_reliable_addr_flags = 0;
2488
2489         // set the system to be initialized
2490         Psnet_reliable_inited = 1;
2491
2492         // initialize my local id #
2493         Psnet_reliable_local_id = 0x1;
2494
2495         // initialize the packet delivery fail count
2496         Psnet_reliable_fail_count = 0;
2497
2498         // intialize the packet necessary resend count
2499         Psnet_reliable_resend_count = 0;
2500
2501         // initialize # of times we've run out of packets and had to overwrite existing ones
2502         Psnet_reliable_overwrite_count = 0;
2503
2504         // return success
2505         return 1;
2506 }
2507
2508 // shutdown the reliable system (free up buffers, etc)
2509 void psnet_reliable_close()
2510 {
2511         // if the system is not initialized, don't do anything
2512         if(!Psnet_reliable_inited){
2513                 return;
2514         }
2515
2516         // free up all buffers
2517         psnet_reliable_free_all_buffers();
2518
2519         // blast all addresses clean
2520         memset(Psnet_reliable_addr,0,sizeof(net_addr_t) * MAX_PLAYERS);
2521         Psnet_reliable_addr_flags = 0;
2522
2523         // set the system as being uninitialized
2524         Psnet_reliable_inited = 0;
2525 }
2526
2527 // notify the reliable system of a new address at index N
2528 void psnet_reliable_notify_new_addr(net_addr_t *addr,int index)
2529 {
2530         // copy in the address
2531         memcpy(&Psnet_reliable_addr[index],addr,sizeof(net_addr_t));
2532
2533         // set the bit indicating its validity
2534         Psnet_reliable_addr_flags |= (1<<index);
2535 }
2536
2537 // notify the reliable system of a drop at index N
2538 void psnet_reliable_notify_drop_addr(net_addr_t *addr)
2539 {
2540         int index;
2541
2542         // do a lookup for the address
2543         index = psnet_reliable_addr_index(addr);
2544         if(index != -1){
2545                 // clear out all packets belonging exclusively to this address
2546                 psnet_reliable_kill_outgoing(index);
2547
2548                 // clear the address and its existence bit
2549                 memset(&Psnet_reliable_addr[index],0,sizeof(net_addr_t));
2550                 Psnet_reliable_addr_flags &= ~(1<<index);
2551         }
2552 }
2553
2554 // send a reliable data packet
2555 int psnet_reliable_send(ubyte *data,int packet_size,net_addr_t *addr)
2556 {
2557         int free_buffer;
2558         int to_index;
2559         reliable_packet_out *p;
2560
2561         // if the system is not initialized, don't do anything
2562         if(!Psnet_reliable_inited){
2563                 return 0;
2564         }
2565
2566         // try and find a guy to send to
2567         to_index = -1;
2568         to_index = psnet_reliable_addr_index(addr);
2569         if(to_index == -1){
2570                 nprintf(("Network","PSNET RELIABLE : could not find player for outgoing packet!\n"));
2571                 return 0;
2572         }
2573
2574         // attempt to get a free buffer
2575         free_buffer = -1;
2576         free_buffer = psnet_reliable_get_free_outgoing();
2577         if(free_buffer == -1){
2578                 Int3();                                         // should never happen - we should always overwrite the oldest buffer
2579         }
2580
2581         // setup the data for the outgoing packet
2582         p = Psnet_reliable_out[free_buffer];
2583         memcpy(p->data,data,packet_size);
2584         p->packet_size = (ushort)packet_size;
2585         p->player_flags |= (1<<to_index);
2586         memset(p->player_stamps,0xf,sizeof(int) * MAX_PLAYERS);
2587         p->player_stamps[to_index] = timestamp(PSNET_RELIABLE_TIMEOUT);
2588         p->out_id = psnet_reliable_get_next_id();
2589         p->age = timer_get_fixed_seconds();
2590
2591         // send the packet
2592         return psnet_reliable_send_packet(p);
2593 }
2594
2595 // process frame for all reliable stuff (call once per frame)
2596 void psnet_reliable_process()
2597 {
2598         int idx,s_idx;
2599         reliable_packet_out *p;
2600
2601         // if the system is not initialized, don't do anything
2602         if(!Psnet_reliable_inited){
2603                 return;
2604         }
2605
2606         // go through all active packets
2607         for(idx=0;idx<PSNET_RELIABLE_NUM_OUT_BUFFERS;idx++){
2608                 // if the packet is active
2609                 if(Psnet_reliable_out[idx]->out_id != PSNET_RELIABLE_INVALID){
2610                         p = Psnet_reliable_out[idx];
2611
2612                         // loop through all active players and see if we need to resend
2613                         for(s_idx=0;s_idx<MAX_PLAYERS;s_idx++){
2614                                 // if the packet is active for this player and he hasn't acked
2615                                 if(p->player_flags & (1<<s_idx) && !(p->player_acks & (1<<s_idx))){
2616                                         // if the timestamp has elapsed
2617                                         if((p->player_stamps[s_idx] != -1) && timestamp_elapsed(p->player_stamps[s_idx])){
2618                                                 // if we are at max resends, bomb!
2619                                                 if(p->num_resends[s_idx] >= PSNET_RELIABLE_REPEAT){
2620 #ifdef PSNET_RELIABLE_VERBOSE
2621                                                         nprintf(("Network","PSNET RELIABLE : packet failed to be delivered (%d retries) !!\n",PSNET_RELIABLE_REPEAT));
2622 #endif
2623                                                         p->player_flags &= ~(1<<s_idx);
2624
2625                                                         // increment the fail count
2626                                                         Psnet_reliable_fail_count++;
2627                                                 }
2628                                                 // otherwise resend the packet
2629                                                 else {
2630                                                         // actually send the data contained with the reliable_packet_out
2631                                                         psnet_reliable_send_packet(p,s_idx);
2632
2633                                                         // increment the resend count
2634                                                         Psnet_reliable_resend_count++;
2635
2636 #ifdef PSNET_RELIABLE_VERBOSE
2637                                                         nprintf(("Network","PSNET RELIABLE : resending packet\n"));
2638 #endif
2639                                                 }
2640                                         }
2641                                 }
2642                         }
2643
2644                         // evaluate if this packet has completed
2645                         psnet_reliable_evaluate_status(p);
2646                 }
2647         }
2648 }
2649
2650 // determine if the passed in reliable data should be processed, and sends an ack if necessary
2651 // return # of bytes which should be stripped off the data (reliable data header)
2652 int psnet_reliable_should_process(net_addr_t *addr,ubyte *data,int packet_size)
2653 {
2654         ushort id_num,unique_id;
2655         int packet_index;
2656         int player_index;
2657         int free_index;
2658         reliable_packet_in *p;
2659
2660         // get the reliable packet id #
2661         memcpy(&id_num,data,sizeof(ushort));
2662
2663         // if the id# is an ack, get the id# do a lookup
2664         if(id_num == PSNET_RELIABLE_ACK){
2665 #ifdef PSNET_RELIABLE_VERBOSE
2666                 nprintf(("Network","PSNET RELIABLE : ACK 1\n"));
2667 #endif
2668
2669                 // get the id#
2670                 memcpy(&id_num,data+2,sizeof(ushort));
2671
2672                 // get the packet index
2673                 // unique_id = psnet_reliable_get_unique_id(id_num,addr);
2674                 unique_id = id_num;
2675                 packet_index = psnet_reliable_find_out_id(unique_id);
2676                 player_index = psnet_reliable_addr_index(addr);
2677                 if((packet_index != -1) && (player_index != -1)){
2678 #ifdef PSNET_RELIABLE_VERBOSE
2679                         nprintf(("Network","PSNET RELIABLE : ACK 2\n"));
2680 #endif
2681
2682                         Psnet_reliable_out[packet_index]->player_acks |= (1<<player_index);
2683
2684                         // check to see if this packet is _done_
2685                         psnet_reliable_evaluate_status(Psnet_reliable_out[packet_index]);
2686                 }
2687
2688                 // return 4 bytes processed
2689                 return 4;
2690         }
2691
2692         // otherwise - see if this is a new packet
2693         packet_index = psnet_reliable_find_in_id(id_num);
2694         if(packet_index == -1){
2695                 // get a free index
2696                 free_index = -1;
2697                 free_index = psnet_reliable_get_free_incoming();
2698                 if(free_index == -1){
2699                         Int3();
2700                 }
2701
2702                 // setup the incoming packet
2703                 p = Psnet_reliable_in[free_index];
2704                 p->age = timer_get_fixed_seconds();
2705                 p->in_id = psnet_reliable_get_unique_id(id_num,addr);
2706
2707                 // send an ack
2708                 psnet_reliable_send_ack(addr,id_num);
2709
2710                 // return 2 bytes processed
2711                 return 2;
2712         }
2713         // send another ack for good measure
2714         else {
2715                 psnet_reliable_send_ack(addr,id_num);
2716         }
2717
2718         return 0;
2719 }
2720
2721 // forward definitions --------------------------------------------
2722
2723 // free up all used buffers
2724 void psnet_reliable_free_all_buffers()
2725 {
2726         int idx;
2727
2728         // free all outgoing buffers
2729         for(idx=0;idx<PSNET_RELIABLE_NUM_OUT_BUFFERS;idx++){
2730                 // if the buffer is not null, free it
2731                 if(Psnet_reliable_out[idx] != NULL){
2732                         free(Psnet_reliable_out[idx]);
2733                         Psnet_reliable_out[idx] = NULL;
2734                 }
2735         }
2736
2737         // free all incoming buffers
2738         for(idx=0;idx<PSNET_RELIABLE_NUM_IN_BUFFERS;idx++){
2739                 // if the buffer is not null, free it
2740                 if(Psnet_reliable_in[idx] != NULL){
2741                         free(Psnet_reliable_in[idx]);
2742                         Psnet_reliable_in[idx] = NULL;
2743                 }
2744         }
2745 }
2746
2747 // get the index of the passed address or -1 if it doesn't exist
2748 int psnet_reliable_addr_index(net_addr_t *addr)
2749 {
2750         int idx;
2751
2752         // look through all valid addresses
2753         for(idx=0;idx<MAX_PLAYERS;idx++){
2754                 if((Psnet_reliable_addr_flags & (1<<idx)) && psnet_same(addr,&Psnet_reliable_addr[idx])){
2755                         return idx;
2756                 }
2757         }
2758
2759         // couldn't find the address
2760         return -1;
2761 }
2762
2763 // get the index into the address array from the passed bitflag
2764 int psnet_reliable_index_addr(int flags)
2765 {
2766         int idx;
2767
2768         // look through all the bits in the flags
2769         for(idx=0;idx<MAX_PLAYERS;idx++){
2770                 if(flags & (1<<idx)){
2771                         return idx;
2772                 }
2773         }
2774
2775         // couldn't find any
2776         return -1;
2777 }
2778
2779 // kill all outgoing packets belonging to the passed index
2780 void psnet_reliable_kill_outgoing(int index)
2781 {
2782         int idx;
2783
2784         // go through all buffers
2785         for(idx=0;idx<PSNET_RELIABLE_NUM_OUT_BUFFERS;idx++){
2786                 if(Psnet_reliable_out[idx]->out_id != PSNET_RELIABLE_INVALID){
2787                         // if it is exclusively his, kill the whole packet
2788                         if(Psnet_reliable_out[idx]->player_flags == (1<<index)){
2789                                 memset(Psnet_reliable_out[idx],0,sizeof(reliable_packet_out));
2790                                 continue;
2791                         }
2792                         // if it belongs to him and other players, kill his entry
2793                         else if(Psnet_reliable_out[idx]->player_flags & (1<<index)){
2794                                 Psnet_reliable_out[idx]->player_flags &= ~(1<<index);
2795                                 Psnet_reliable_out[idx]->num_resends[index] = 0;
2796                         }
2797                 }
2798         }
2799 }
2800
2801 // generate a unique id #, given the passed in value and the address it came from, return PSNET_RELIABLE_INVALID
2802 // upper 12 bytes should be valid # and the lower 4 should be free for this function to fill in
2803 ushort psnet_reliable_get_unique_id(ushort id_num,net_addr_t *from)
2804 {
2805         int idx;
2806         ushort cast;
2807
2808         // if the lower 4 bits are not clear, we've got a problem
2809         if(id_num & 0xf){
2810                 Int3();
2811         }
2812
2813         // lookup through the Psnet_reliable_addr[] list and try and find the index
2814         for(idx=0;idx<MAX_PLAYERS;idx++){
2815                 if((idx == 1) /*(Psnet_reliable_addr_flags & (1<<idx)) && (psnet_same(from,&Psnet_reliable_addr[idx]))*/){
2816                         // fill in the lower 4 bits
2817                         cast = (ushort)idx;
2818                         id_num |= (cast & 0xf);
2819                         return id_num;
2820                 }
2821         }
2822
2823         // couldn't find an id#
2824         return PSNET_RELIABLE_INVALID;
2825 }
2826
2827 // get the upper 12 bit version of my id# and increment the original
2828 ushort psnet_reliable_get_next_id()
2829 {
2830         ushort id_num = Psnet_reliable_local_id;
2831
2832         // clear out the upper 4 bits
2833         id_num &= 0x0fff;
2834
2835         // shift 4 bits to the left
2836         id_num <<= 4;
2837
2838         // increment the local id #
2839         if(Psnet_reliable_local_id == 0x0fff){
2840                 Psnet_reliable_local_id = 0x1;
2841         } else {
2842                 Psnet_reliable_local_id++;
2843         }
2844
2845         // return the shifted value
2846         return id_num;
2847 }
2848
2849 // get the index of a free outgoing relible packet buffer, killing the oldest if necessary
2850 int psnet_reliable_get_free_outgoing()
2851 {
2852         fix oldest = -1;
2853         int oldest_index = -1;
2854         int idx;
2855
2856         // search through all buffers
2857         for(idx=0;idx<PSNET_RELIABLE_NUM_OUT_BUFFERS;idx++){
2858                 if(Psnet_reliable_out[idx]->out_id == PSNET_RELIABLE_INVALID){
2859                         return idx;
2860                 }
2861
2862                 // keep track of the oldest packet
2863                 if((oldest_index == -1) || (Psnet_reliable_out[idx]->age < oldest)){
2864                         oldest_index = idx;
2865                         oldest = Psnet_reliable_out[idx]->age;
2866                 }
2867         }
2868
2869         // if we got here, all of our buffers are full, so we should kill the oldest one
2870         memset(Psnet_reliable_out[oldest_index],0,sizeof(reliable_packet_out));
2871         Psnet_reliable_overwrite_count = 0;
2872 #ifdef PSNET_RELIABLE_VERBOSE
2873         nprintf(("Network","PSNET RELIABLE : overwriting old send buffer\n"));
2874 #endif
2875         return oldest_index;
2876 }
2877
2878 // get the index of a free incoming relible packet buffer, killing the oldest if necessary
2879 int psnet_reliable_get_free_incoming()
2880 {
2881         fix oldest = -1;
2882         int oldest_index = -1;
2883         int idx;
2884
2885         // search through all buffers
2886         for(idx=0;idx<PSNET_RELIABLE_NUM_IN_BUFFERS;idx++){
2887                 if(Psnet_reliable_in[idx]->in_id == PSNET_RELIABLE_INVALID){
2888                         return idx;
2889                 }
2890
2891                 // keep track of the oldest packet
2892                 if((oldest_index == -1) || (Psnet_reliable_in[idx]->age < oldest)){
2893                         oldest_index = idx;
2894                         oldest = Psnet_reliable_in[idx]->age;
2895                 }
2896         }
2897
2898         // if we got here, all of our buffers are full, so we should kill the oldest one
2899         memset(Psnet_reliable_in[oldest_index],0,sizeof(reliable_packet_in));
2900 #ifdef PSNET_RELIABLE_VERBOSE
2901         nprintf(("Network","PSNET RELIABLE : overwriting old recv buffer\n"));
2902 #endif
2903         return oldest_index;
2904 }
2905
2906 // actually send the data contained with the reliable_packet_out
2907 int psnet_reliable_send_packet(reliable_packet_out *out,int force_index)
2908 {
2909         ubyte data[MAX_PACKET_SIZE];
2910         int idx,bytes_sent;
2911         int packet_size = 2 + out->packet_size;
2912
2913         // stick the identifier on the front of the packet
2914         memcpy(data,&out->out_id,sizeof(ushort));
2915
2916         // copy in the actual data
2917         memcpy(data+2,out->data,out->packet_size);
2918
2919         // send the packet and update the timestamp for all players
2920
2921         // send to one specified player in the packet
2922         bytes_sent = 0;
2923         if(force_index != 0){
2924                 if(out->player_flags & (1<<force_index) && !(out->player_acks & (1<<force_index))){
2925                         bytes_sent = psnet_send(&Psnet_reliable_addr[force_index],data,packet_size,PSNET_FLAG_RAW,1);
2926                         out->player_stamps[force_index] = timestamp(PSNET_RELIABLE_TIMEOUT);
2927                         out->num_resends[force_index]++;
2928                 }
2929         }
2930         // send to all players contained in the packet
2931         else {
2932                 for(idx=0;idx<MAX_PLAYERS;idx++){
2933                         // if this guy is flagged and he exists and he hasn't already acked
2934                         if(out->player_flags & (1<<idx) && (Psnet_reliable_addr_flags & (1<<idx)) && !(out->player_acks & (1<<idx))){
2935                                 bytes_sent = psnet_send(&Psnet_reliable_addr[idx],data,packet_size,PSNET_FLAG_RAW,1);
2936                                 out->player_stamps[idx] = timestamp(PSNET_RELIABLE_TIMEOUT);
2937                                 out->num_resends[idx]++;
2938                         }
2939                 }
2940         }
2941
2942         // return success
2943         return bytes_sent;
2944 }
2945
2946 // evaluate the status of a reliable packet - and free it up if the thing is _done_
2947 void psnet_reliable_evaluate_status(reliable_packet_out *out)
2948 {
2949         int idx,ok;
2950
2951         // check to see if all players have acked or failed miserably
2952         ok = 1;
2953         for(idx=0;idx<MAX_PLAYERS;idx++){
2954                 // if the packet is active for this guy but he has not acked yet
2955                 if((out->player_flags & (1<<idx)) && !(out->player_acks & (1<<idx))){
2956                         ok = 0;
2957                         break;
2958                 }
2959         }
2960
2961         // if its ok to annihilate this packet, do so
2962         if(ok){
2963                 memset(out,0,sizeof(reliable_packet_out));
2964         }
2965 }
2966
2967 // determine if the passed id# exists in the in-packet list, return the instance where it exists, or -1 if it doesn't
2968 int psnet_reliable_find_in_id(ushort id_num)
2969 {
2970         int idx;
2971
2972         // if the id is 0, its invalid
2973         if(id_num == PSNET_RELIABLE_INVALID){
2974                 return -1;
2975         }
2976
2977         // look through all in packets
2978         for(idx=0;idx<PSNET_RELIABLE_NUM_IN_BUFFERS;idx++){
2979                 if(id_num == Psnet_reliable_in[idx]->in_id){
2980                         return idx;
2981                 }
2982         }
2983
2984         // couldn't find it
2985         return -1;
2986 }
2987
2988 // determine if the passed id# exists in the out-packet list, return the instance where it exists, or -1 if it doesn't
2989 int psnet_reliable_find_out_id(ushort id_num)
2990 {
2991         int idx;
2992
2993         // if the id is 0, its invalid
2994         if(id_num == PSNET_RELIABLE_INVALID){
2995                 return -1;
2996         }
2997
2998         // look through all in packets
2999         for(idx=0;idx<PSNET_RELIABLE_NUM_OUT_BUFFERS;idx++){
3000                 if(id_num == Psnet_reliable_out[idx]->out_id){
3001                         return idx;
3002                 }
3003         }
3004
3005         // couldn't find it
3006         return -1;
3007 }
3008
3009 // send an ack to the specified address
3010 void psnet_reliable_send_ack(net_addr_t *addr,ushort id_num)
3011 {
3012         ubyte data[10];
3013         ushort val;
3014
3015         // add in the ack
3016         val = PSNET_RELIABLE_ACK;
3017         memcpy(data,&val,sizeof(ushort));
3018
3019         // add in the id#
3020         memcpy(data+2,&id_num,sizeof(ushort));
3021
3022         // send the data
3023         psnet_send(addr,data,4,PSNET_FLAG_RAW,Reliable_socket);
3024 }
3025
3026 // wrappers around select() and recvfrom() for lagging/losing data, and for sorting through different packet types
3027 int RECVFROM(SOCKET s, char * buf, int len, int flags, sockaddr *from, int *fromlen, int psnet_type)
3028 {
3029         net_addr_t addr;
3030         int ret;
3031         int ret_len;
3032
3033         // if we have no buffer! The user should have made sure this wasn't the case by calling SELECT()
3034         ret = psnet_buffer_get_next((ubyte*)buf, &ret_len, &addr);
3035         if(!ret){
3036                 Int3();
3037                 return -1;
3038         }
3039
3040         // otherwise, stuff the outgoing data
3041         ((struct sockaddr_in*)from)->sin_port = htons(addr.port);
3042         memcpy(&((struct sockaddr_in*)from)->sin_addr.s_addr, addr.addr, 4);
3043         ((struct sockaddr_in*)from)->sin_family = AF_INET;
3044         *fromlen = sizeof(struct sockaddr_in);
3045
3046         // return bytes read
3047         return ret_len;
3048 }
3049
3050 int SELECT(int nfds, fd_set *readfds, fd_set *writefds, fd_set*exceptfds, struct timeval* timeout, int psnet_type)
3051 {
3052         // if this is a check for writability, just return the select
3053         if(writefds != NULL){
3054                 return select(nfds, readfds, writefds, exceptfds, timeout);
3055         }
3056
3057         // do we have any buffers in here?
3058         if((Psnet_lowest_id == -1) || (Psnet_lowest_id > Psnet_highest_id)){
3059                 return 0;
3060         }
3061
3062         // yo
3063         return 1;
3064 }
3065
3066 // wrappers around sendto to sorting through different packet types
3067 int SENDTO(SOCKET s, char * buf, int len, int flags, sockaddr * to, int tolen, int psnet_type)
3068 {
3069         return sendto(s, buf, len, flags, (struct sockaddr *)to, tolen);
3070 }
3071
3072 // call this once per frame to read everything off of our socket
3073 void PSNET_TOP_LAYER_PROCESS()
3074 {
3075         psnet_get_socket_data(Unreliable_socket);
3076 }
3077
3078 #endif  // #ifndef PSNET2