src/MultiPlayer/multiplaymgr.cxx

   1 //////////////////////////////////////////////////////////////////////
   2 //
   3 // multiplaymgr.hpp
   4 //
   5 // Written by Duncan McCreanor, started February 2003.
   6 // duncan.mccreanor@airservicesaustralia.com
   7 //
   8 // Copyright (C) 2003  Airservices Australia
   9 // Copyright (C) 2005  Oliver Schroeder
  10 // Copyright (C) 2006  Mathias Froehlich
  11 //
  12 // This program is free software; you can redistribute it and/or
  13 // modify it under the terms of the GNU General Public License as
  14 // published by the Free Software Foundation; either version 2 of the
  15 // License, or (at your option) any later version.
  16 //
  17 // This program is distributed in the hope that it will be useful, but
  18 // WITHOUT ANY WARRANTY; without even the implied warranty of
  19 // MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  20 // General Public License for more details.
  21 //
  22 // You should have received a copy of the GNU General Public License
  23 // along with this program; if not, write to the Free Software
  24 // Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301, USA.
  25 //
  26 // $Id$
  27 //
  28 //////////////////////////////////////////////////////////////////////
  29
  30 #ifdef HAVE_CONFIG_H
  31 #include <config.h>
  32 #endif
  33
  34 #include <plib/netSocket.h>
  35
  36 #include <simgear/misc/stdint.hxx>
  37 #include <simgear/timing/timestamp.hxx>
  38 #include <simgear/debug/logstream.hxx>
  39 #include <simgear/props/props.hxx>
  40
  41 #include <AIModel/AIManager.hxx>
  42 #include <Main/fg_props.hxx>
  43 #include "multiplaymgr.hxx"
  44 #include "mpmessages.hxx"
  45
  46 #define MAX_PACKET_SIZE 1200
  47 #define MAX_TEXT_SIZE 128
  48
  49 // These constants are provided so that the ident
  50 // command can list file versions
  51 const char sMULTIPLAYMGR_BID[] = "$Id$";
  52 const char sMULTIPLAYMGR_HID[] = MULTIPLAYTXMGR_HID;
  53
  54 // A static map of protocol property id values to property paths,
  55 // This should be extendable dynamically for every specific aircraft ...
  56 // For now only that static list
  57 FGMultiplayMgr::IdPropertyList
  58 FGMultiplayMgr::sIdPropertyList[] = {
  59   {100, "surface-positions/left-aileron-pos-norm",  SGPropertyNode::FLOAT},
  60   {101, "surface-positions/right-aileron-pos-norm", SGPropertyNode::FLOAT},
  61   {102, "surface-positions/elevator-pos-norm",      SGPropertyNode::FLOAT},
  62   {103, "surface-positions/rudder-pos-norm",        SGPropertyNode::FLOAT},
  63   {104, "surface-positions/flap-pos-norm",          SGPropertyNode::FLOAT},
  64   {105, "surface-positions/speedbrake-pos-norm",    SGPropertyNode::FLOAT},
  65   {106, "gear/tailhook/position-norm",              SGPropertyNode::FLOAT},
  66   {107, "gear/launchbar/position-norm",             SGPropertyNode::FLOAT},
  67   {108, "gear/launchbar/state",                     SGPropertyNode::STRING},
  68   {109, "gear/launchbar/holdback-position-norm",    SGPropertyNode::FLOAT},
  69   {110, "canopy/position-norm",                     SGPropertyNode::FLOAT},
  70
  71   {200, "gear/gear[0]/compression-norm",           SGPropertyNode::FLOAT},
  72   {201, "gear/gear[0]/position-norm",              SGPropertyNode::FLOAT},
  73   {210, "gear/gear[1]/compression-norm",           SGPropertyNode::FLOAT},
  74   {211, "gear/gear[1]/position-norm",              SGPropertyNode::FLOAT},
  75   {220, "gear/gear[2]/compression-norm",           SGPropertyNode::FLOAT},
  76   {221, "gear/gear[2]/position-norm",              SGPropertyNode::FLOAT},
  77   {230, "gear/gear[3]/compression-norm",           SGPropertyNode::FLOAT},
  78   {231, "gear/gear[3]/position-norm",              SGPropertyNode::FLOAT},
  79   {240, "gear/gear[4]/compression-norm",           SGPropertyNode::FLOAT},
  80   {241, "gear/gear[4]/position-norm",              SGPropertyNode::FLOAT},
  81
  82   {300, "engines/engine[0]/n1",  SGPropertyNode::FLOAT},
  83   {301, "engines/engine[0]/n2",  SGPropertyNode::FLOAT},
  84   {302, "engines/engine[0]/rpm", SGPropertyNode::FLOAT},
  85   {310, "engines/engine[1]/n1",  SGPropertyNode::FLOAT},
  86   {311, "engines/engine[1]/n2",  SGPropertyNode::FLOAT},
  87   {312, "engines/engine[1]/rpm", SGPropertyNode::FLOAT},
  88   {320, "engines/engine[2]/n1",  SGPropertyNode::FLOAT},
  89   {321, "engines/engine[2]/n2",  SGPropertyNode::FLOAT},
  90   {322, "engines/engine[2]/rpm", SGPropertyNode::FLOAT},
  91   {330, "engines/engine[3]/n1",  SGPropertyNode::FLOAT},
  92   {331, "engines/engine[3]/n2",  SGPropertyNode::FLOAT},
  93   {332, "engines/engine[3]/rpm", SGPropertyNode::FLOAT},
  94   {340, "engines/engine[4]/n1",  SGPropertyNode::FLOAT},
  95   {341, "engines/engine[4]/n2",  SGPropertyNode::FLOAT},
  96   {342, "engines/engine[4]/rpm", SGPropertyNode::FLOAT},
  97   {350, "engines/engine[5]/n1",  SGPropertyNode::FLOAT},
  98   {351, "engines/engine[5]/n2",  SGPropertyNode::FLOAT},
  99   {352, "engines/engine[5]/rpm", SGPropertyNode::FLOAT},
 100   {360, "engines/engine[6]/n1",  SGPropertyNode::FLOAT},
 101   {361, "engines/engine[6]/n2",  SGPropertyNode::FLOAT},
 102   {362, "engines/engine[6]/rpm", SGPropertyNode::FLOAT},
 103   {370, "engines/engine[7]/n1",  SGPropertyNode::FLOAT},
 104   {371, "engines/engine[7]/n2",  SGPropertyNode::FLOAT},
 105   {372, "engines/engine[7]/rpm", SGPropertyNode::FLOAT},
 106   {380, "engines/engine[8]/n1",  SGPropertyNode::FLOAT},
 107   {381, "engines/engine[8]/n2",  SGPropertyNode::FLOAT},
 108   {382, "engines/engine[8]/rpm", SGPropertyNode::FLOAT},
 109   {390, "engines/engine[9]/n1",  SGPropertyNode::FLOAT},
 110   {391, "engines/engine[9]/n2",  SGPropertyNode::FLOAT},
 111   {392, "engines/engine[9]/rpm", SGPropertyNode::FLOAT},
 112
 113   {800, "rotors/main/rpm", SGPropertyNode::FLOAT},
 114   {801, "rotors/tail/rpm", SGPropertyNode::FLOAT},
 115   {810, "rotors/main/blade[0]/position-deg",  SGPropertyNode::FLOAT},
 116   {811, "rotors/main/blade[1]/position-deg",  SGPropertyNode::FLOAT},
 117   {812, "rotors/main/blade[2]/position-deg",  SGPropertyNode::FLOAT},
 118   {813, "rotors/main/blade[3]/position-deg",  SGPropertyNode::FLOAT},
 119   {820, "rotors/main/blade[0]/flap-deg",  SGPropertyNode::FLOAT},
 120   {821, "rotors/main/blade[1]/flap-deg",  SGPropertyNode::FLOAT},
 121   {822, "rotors/main/blade[2]/flap-deg",  SGPropertyNode::FLOAT},
 122   {823, "rotors/main/blade[3]/flap-deg",  SGPropertyNode::FLOAT},
 123   {830, "rotors/tail/blade[0]/position-deg",  SGPropertyNode::FLOAT},
 124   {831, "rotors/tail/blade[1]/position-deg",  SGPropertyNode::FLOAT},
 125
 126   {900, "sim/hitches/aerotow/tow/length",                       SGPropertyNode::FLOAT},
 127   {901, "sim/hitches/aerotow/tow/elastic-constant",             SGPropertyNode::FLOAT},
 128   {902, "sim/hitches/aerotow/tow/weight-per-m-kg-m",            SGPropertyNode::FLOAT},
 129   {903, "sim/hitches/aerotow/tow/dist",                         SGPropertyNode::FLOAT},
 130   {904, "sim/hitches/aerotow/tow/connected-to-property-node",   SGPropertyNode::BOOL},
 131   {905, "sim/hitches/aerotow/tow/connected-to-ai-or-mp-callsign",   SGPropertyNode::STRING},
 132   {906, "sim/hitches/aerotow/tow/brake-force",                  SGPropertyNode::FLOAT},
 133   {907, "sim/hitches/aerotow/tow/end-force-x",                  SGPropertyNode::FLOAT},
 134   {908, "sim/hitches/aerotow/tow/end-force-y",                  SGPropertyNode::FLOAT},
 135   {909, "sim/hitches/aerotow/tow/end-force-z",                  SGPropertyNode::FLOAT},
 136   {930, "sim/hitches/aerotow/is-slave",                         SGPropertyNode::BOOL},
 137   {931, "sim/hitches/aerotow/speed-in-tow-direction",           SGPropertyNode::FLOAT},
 138   {932, "sim/hitches/aerotow/open",                             SGPropertyNode::BOOL},
 139   {933, "sim/hitches/aerotow/local-pos-x",                      SGPropertyNode::FLOAT},
 140   {934, "sim/hitches/aerotow/local-pos-y",                      SGPropertyNode::FLOAT},
 141   {935, "sim/hitches/aerotow/local-pos-z",                      SGPropertyNode::FLOAT},
 142
 143   {1001, "controls/flight/slats",  SGPropertyNode::FLOAT},
 144   {1002, "controls/flight/speedbrake",  SGPropertyNode::FLOAT},
 145   {1003, "controls/flight/spoilers",  SGPropertyNode::FLOAT},
 146   {1004, "controls/gear/gear-down",  SGPropertyNode::FLOAT},
 147   {1005, "controls/lighting/nav-lights",  SGPropertyNode::FLOAT},
 148   {1006, "controls/armament/station[0]/jettison-all",  SGPropertyNode::BOOL},
 149
 150   {10001, "sim/multiplay/transmission-freq-hz",  SGPropertyNode::STRING},
 151   {10002, "sim/multiplay/chat",  SGPropertyNode::STRING},
 152
 153   /// termination
 154   {0, 0, SGPropertyNode::UNSPECIFIED}
 155 };
 156
 157 //////////////////////////////////////////////////////////////////////
 158 //
 159 //  MultiplayMgr constructor
 160 //
 161 //////////////////////////////////////////////////////////////////////
 162 FGMultiplayMgr::FGMultiplayMgr()
 163 {
 164   mInitialised   = false;
 165   mHaveServer    = false;
 166 } // FGMultiplayMgr::FGMultiplayMgr()
 167 //////////////////////////////////////////////////////////////////////
 168
 169 //////////////////////////////////////////////////////////////////////
 170 //
 171 //  MultiplayMgr destructor
 172 //
 173 //////////////////////////////////////////////////////////////////////
 174 FGMultiplayMgr::~FGMultiplayMgr()
 175 {
 176   Close();
 177 } // FGMultiplayMgr::~FGMultiplayMgr()
 178 //////////////////////////////////////////////////////////////////////
 179
 180 //////////////////////////////////////////////////////////////////////
 181 //
 182 //  Initialise object
 183 //
 184 //////////////////////////////////////////////////////////////////////
 185 bool
 186 FGMultiplayMgr::init (void)
 187 {
 188   //////////////////////////////////////////////////
 189   //  Initialise object if not already done
 190   //////////////////////////////////////////////////
 191   if (mInitialised) {
 192     SG_LOG(SG_NETWORK, SG_WARN, "FGMultiplayMgr::init - already initialised");
 193     return false;
 194   }
 195   //////////////////////////////////////////////////
 196   //  Set members from property values
 197   //////////////////////////////////////////////////
 198   short rxPort = fgGetInt("/sim/multiplay/rxport");
 199   if (rxPort <= 0)
 200     rxPort = 5000;
 201   mCallsign = fgGetString("/sim/multiplay/callsign");
 202   if (mCallsign.empty())
 203     // FIXME: use getpwuid
 204     mCallsign = "JohnDoe";
 205   string rxAddress = fgGetString("/sim/multiplay/rxhost");
 206   if (rxAddress.empty())
 207     rxAddress = "127.0.0.1";
 208   short txPort = fgGetInt("/sim/multiplay/txport");
 209   string txAddress = fgGetString("/sim/multiplay/txhost");
 210   if (txPort > 0 && !txAddress.empty()) {
 211     mHaveServer = true;
 212     mServer.set(txAddress.c_str(), txPort);
 213   }
 214   SG_LOG(SG_NETWORK,SG_INFO,"FGMultiplayMgr::init-txaddress= "<<txAddress);
 215   SG_LOG(SG_NETWORK,SG_INFO,"FGMultiplayMgr::init-txport= "<<txPort );
 216   SG_LOG(SG_NETWORK,SG_INFO,"FGMultiplayMgr::init-rxaddress="<<rxAddress );
 217   SG_LOG(SG_NETWORK,SG_INFO,"FGMultiplayMgr::init-rxport= "<<rxPort);
 218   SG_LOG(SG_NETWORK,SG_INFO,"FGMultiplayMgr::init-callsign= "<<mCallsign);
 219   mSocket = new netSocket();
 220   if (!mSocket->open(false)) {
 221     SG_LOG( SG_NETWORK, SG_ALERT,
 222             "FGMultiplayMgr::init - Failed to create data socket" );
 223     return false;
 224   }
 225   mSocket->setBlocking(false);
 226   if (mSocket->bind(rxAddress.c_str(), rxPort) != 0) {
 227     perror("bind");
 228     SG_LOG( SG_NETWORK, SG_ALERT,
 229             "FGMultiplayMgr::Open - Failed to bind receive socket" );
 230     return false;
 231   }
 232   mInitialised = true;
 233   return true;
 234 } // FGMultiplayMgr::init()
 235 //////////////////////////////////////////////////////////////////////
 236
 237 //////////////////////////////////////////////////////////////////////
 238 //
 239 //  Closes and deletes the local player object. Closes
 240 //  and deletes the tx socket. Resets the object state to unitialised.
 241 //
 242 //////////////////////////////////////////////////////////////////////
 243 void
 244 FGMultiplayMgr::Close (void)
 245 {
 246   mMultiPlayerMap.clear();
 247
 248   if (mSocket) {
 249     mSocket->close();
 250     delete mSocket;
 251     mSocket = 0;
 252   }
 253   mInitialised = false;
 254 } // FGMultiplayMgr::Close(void)
 255 //////////////////////////////////////////////////////////////////////
 256
 257 //////////////////////////////////////////////////////////////////////
 258 //
 259 //  Description: Sends the position data for the local position.
 260 //
 261 //////////////////////////////////////////////////////////////////////
 262 void
 263 FGMultiplayMgr::SendMyPosition(const FGExternalMotionData& motionInfo)
 264 {
 265   if ((! mInitialised) || (! mHaveServer)) {
 266     if (! mInitialised)
 267       SG_LOG( SG_NETWORK, SG_ALERT,
 268               "FGMultiplayMgr::SendMyPosition - not initialised" );
 269     if (! mHaveServer)
 270       SG_LOG( SG_NETWORK, SG_ALERT,
 271               "FGMultiplayMgr::SendMyPosition - no server" );
 272     return;
 273   }
 274
 275   T_PositionMsg PosMsg;
 276   strncpy(PosMsg.Model, fgGetString("/sim/model/path"), MAX_MODEL_NAME_LEN);
 277   PosMsg.Model[MAX_MODEL_NAME_LEN - 1] = '\0';
 278
 279   PosMsg.time = XDR_encode_double (motionInfo.time);
 280   PosMsg.lag = XDR_encode_double (motionInfo.lag);
 281   for (unsigned i = 0 ; i < 3; ++i)
 282     PosMsg.position[i] = XDR_encode_double (motionInfo.position(i));
 283   SGVec3f angleAxis;
 284   motionInfo.orientation.getAngleAxis(angleAxis);
 285   for (unsigned i = 0 ; i < 3; ++i)
 286     PosMsg.orientation[i] = XDR_encode_float (angleAxis(i));
 287   for (unsigned i = 0 ; i < 3; ++i)
 288     PosMsg.linearVel[i] = XDR_encode_float (motionInfo.linearVel(i));
 289   for (unsigned i = 0 ; i < 3; ++i)
 290     PosMsg.angularVel[i] = XDR_encode_float (motionInfo.angularVel(i));
 291   for (unsigned i = 0 ; i < 3; ++i)
 292     PosMsg.linearAccel[i] = XDR_encode_float (motionInfo.linearAccel(i));
 293   for (unsigned i = 0 ; i < 3; ++i)
 294     PosMsg.angularAccel[i] = XDR_encode_float (motionInfo.angularAccel(i));
 295
 296   char Msg[MAX_PACKET_SIZE];
 297   memcpy(Msg + sizeof(T_MsgHdr), &PosMsg, sizeof(T_PositionMsg));
 298
 299   char* ptr = Msg + sizeof(T_MsgHdr) + sizeof(T_PositionMsg);
 300   std::vector<FGPropertyData*>::const_iterator it;
 301   it = motionInfo.properties.begin();
 302   //cout << "OUTPUT PROPERTIES\n";
 303   while (it != motionInfo.properties.end()
 304          && ptr < (Msg + MAX_PACKET_SIZE - sizeof(xdr_data_t))) {
 305
 306     // First elements is the ID
 307     xdr_data_t xdr = XDR_encode_uint32((*it)->id);
 308     memcpy(ptr, &xdr, sizeof(xdr_data_t));
 309     ptr += sizeof(xdr_data_t);
 310
 311     // The actual data representation depends on the type
 312     switch ((*it)->type) {
 313       case SGPropertyNode::INT:
 314       case SGPropertyNode::BOOL:
 315       case SGPropertyNode::LONG:
 316         xdr = XDR_encode_uint32((*it)->int_value);
 317         memcpy(ptr, &xdr, sizeof(xdr_data_t));
 318         ptr += sizeof(xdr_data_t);
 319         //cout << "Prop:" << (*it)->id << " " << (*it)->type << " "<< (*it)->int_value << "\n";
 320         break;
 321       case SGPropertyNode::FLOAT:
 322       case SGPropertyNode::DOUBLE:
 323         xdr = XDR_encode_float((*it)->float_value);;
 324         memcpy(ptr, &xdr, sizeof(xdr_data_t));
 325         ptr += sizeof(xdr_data_t);
 326         //cout << "Prop:" << (*it)->id << " " << (*it)->type << " "<< (*it)->float_value << "\n";
 327         break;
 328       case SGPropertyNode::STRING:
 329       case SGPropertyNode::UNSPECIFIED:
 330         {
 331           // String is complicated. It consists of
 332           // The length of the string
 333           // The string itself
 334           // Padding to the nearest 4-bytes.
 335           const char* lcharptr = (*it)->string_value;
 336
 337           if (lcharptr != 0)
 338           {
 339             // Add the length
 340             ////cout << "String length: " << strlen(lcharptr) << "\n";
 341             uint32_t len = strlen(lcharptr);
 342             //cout << "String length unint32: " << len << "\n";
 343             xdr = XDR_encode_uint32(len);
 344             memcpy(ptr, &xdr, sizeof(xdr_data_t));
 345             ptr += sizeof(xdr_data_t);
 346
 347             if (len != 0)
 348             {
 349
 350               // Now the text itself
 351               int lcount = 0;
 352               while ((*lcharptr != '\0') && (lcount < MAX_TEXT_SIZE))
 353               {
 354                 xdr = XDR_encode_int8(*lcharptr);
 355                 memcpy(ptr, &xdr, sizeof(xdr_data_t));
 356                 ptr += sizeof(xdr_data_t);
 357                 lcharptr++;
 358                 lcount++;
 359               }
 360
 361               //cout << "Prop:" << (*it)->id << " " << (*it)->type << " " << len << " " << (*it)->string_value;
 362
 363               // Now pad if required
 364               while ((lcount % 4) != 0)
 365               {
 366                 xdr = XDR_encode_int8(0);
 367                 memcpy(ptr, &xdr, sizeof(xdr_data_t));
 368                 ptr += sizeof(xdr_data_t);
 369                 lcount++;
 370                 //cout << "0";
 371               }
 372
 373               //cout << "\n";
 374             }
 375           }
 376           else
 377           {
 378             // Nothing to encode
 379             xdr = XDR_encode_uint32(0);
 380             memcpy(ptr, &xdr, sizeof(xdr_data_t));
 381             ptr += sizeof(xdr_data_t);
 382             //cout << "Prop:" << (*it)->id << " " << (*it)->type << " 0\n";
 383           }
 384
 385         }
 386         break;
 387
 388       default:
 389         //cout << " Unknown Type: " << (*it)->type << "\n";
 390         xdr = XDR_encode_float((*it)->float_value);;
 391         memcpy(ptr, &xdr, sizeof(xdr_data_t));
 392         ptr += sizeof(xdr_data_t);
 393         //cout << "Prop:" << (*it)->id << " " << (*it)->type << " "<< (*it)->float_value << "\n";
 394         break;
 395     }
 396
 397     ++it;
 398   }
 399
 400   T_MsgHdr MsgHdr;
 401   FillMsgHdr(&MsgHdr, POS_DATA_ID, ptr - Msg);
 402   memcpy(Msg, &MsgHdr, sizeof(T_MsgHdr));
 403
 404   mSocket->sendto(Msg, ptr - Msg, 0, &mServer);
 405   SG_LOG(SG_NETWORK, SG_DEBUG, "FGMultiplayMgr::SendMyPosition");
 406 } // FGMultiplayMgr::SendMyPosition()
 407 //////////////////////////////////////////////////////////////////////
 408
 409 //////////////////////////////////////////////////////////////////////
 410 //
 411 //  Name: SendTextMessage
 412 //  Description: Sends a message to the player. The message must
 413 //  contain a valid and correctly filled out header and optional
 414 //  message body.
 415 //
 416 //////////////////////////////////////////////////////////////////////
 417 void
 418 FGMultiplayMgr::SendTextMessage(const string &MsgText)
 419 {
 420   if (!mInitialised || !mHaveServer)
 421     return;
 422
 423   T_MsgHdr MsgHdr;
 424   FillMsgHdr(&MsgHdr, CHAT_MSG_ID);
 425   //////////////////////////////////////////////////
 426   // Divide the text string into blocks that fit
 427   // in the message and send the blocks.
 428   //////////////////////////////////////////////////
 429   unsigned iNextBlockPosition = 0;
 430   T_ChatMsg ChatMsg;
 431
 432   char Msg[sizeof(T_MsgHdr) + sizeof(T_ChatMsg)];
 433   while (iNextBlockPosition < MsgText.length()) {
 434     strncpy (ChatMsg.Text,
 435              MsgText.substr(iNextBlockPosition, MAX_CHAT_MSG_LEN - 1).c_str(),
 436              MAX_CHAT_MSG_LEN);
 437     ChatMsg.Text[MAX_CHAT_MSG_LEN - 1] = '\0';
 438     memcpy (Msg, &MsgHdr, sizeof(T_MsgHdr));
 439     memcpy (Msg + sizeof(T_MsgHdr), &ChatMsg, sizeof(T_ChatMsg));
 440     mSocket->sendto (Msg, sizeof(T_MsgHdr) + sizeof(T_ChatMsg), 0, &mServer);
 441     iNextBlockPosition += MAX_CHAT_MSG_LEN - 1;
 442
 443   }
 444
 445
 446 } // FGMultiplayMgr::SendTextMessage ()
 447 //////////////////////////////////////////////////////////////////////
 448
 449 //////////////////////////////////////////////////////////////////////
 450 //
 451 //  Name: ProcessData
 452 //  Description: Processes data waiting at the receive socket. The
 453 //  processing ends when there is no more data at the socket.
 454 //
 455 //////////////////////////////////////////////////////////////////////
 456 void
 457 FGMultiplayMgr::Update(void)
 458 {
 459   if (!mInitialised)
 460     return;
 461
 462   /// Just for expiry
 463   SGTimeStamp timestamper;
 464   timestamper.stamp();
 465   long stamp = timestamper.get_seconds();
 466
 467   //////////////////////////////////////////////////
 468   //  Read the receive socket and process any data
 469   //////////////////////////////////////////////////
 470   int bytes;
 471   do {
 472     char Msg[MAX_PACKET_SIZE];
 473     //////////////////////////////////////////////////
 474     //  Although the recv call asks for
 475     //  MAX_PACKET_SIZE of data, the number of bytes
 476     //  returned will only be that of the next
 477     //  packet waiting to be processed.
 478     //////////////////////////////////////////////////
 479     netAddress SenderAddress;
 480     bytes = mSocket->recvfrom(Msg, sizeof(Msg), 0, &SenderAddress);
 481     //////////////////////////////////////////////////
 482     //  no Data received
 483     //////////////////////////////////////////////////
 484     if (bytes <= 0) {
 485       if (errno != EAGAIN && errno != 0) // MSVC output "NoError" otherwise
 486         perror("FGMultiplayMgr::MP_ProcessData");
 487       break;
 488     }
 489     if (bytes <= sizeof(T_MsgHdr)) {
 490       SG_LOG( SG_NETWORK, SG_ALERT, "FGMultiplayMgr::MP_ProcessData - "
 491               << "received message with insufficient data" );
 492       break;
 493     }
 494     //////////////////////////////////////////////////
 495     //  Read header
 496     //////////////////////////////////////////////////
 497     T_MsgHdr* MsgHdr = (T_MsgHdr *)Msg;
 498     MsgHdr->Magic       = XDR_decode_uint32 (MsgHdr->Magic);
 499     MsgHdr->Version     = XDR_decode_uint32 (MsgHdr->Version);
 500     MsgHdr->MsgId       = XDR_decode_uint32 (MsgHdr->MsgId);
 501     MsgHdr->MsgLen      = XDR_decode_uint32 (MsgHdr->MsgLen);
 502     MsgHdr->ReplyPort   = XDR_decode_uint32 (MsgHdr->ReplyPort);
 503     if (MsgHdr->Magic != MSG_MAGIC) {
 504       SG_LOG( SG_NETWORK, SG_ALERT, "FGMultiplayMgr::MP_ProcessData - "
 505               << "message has invalid magic number!" );
 506     }
 507     if (MsgHdr->Version != PROTO_VER) {
 508       SG_LOG( SG_NETWORK, SG_ALERT, "FGMultiplayMgr::MP_ProcessData - "
 509               << "message has invalid protocoll number!" );
 510     }
 511     if (MsgHdr->MsgLen != bytes) {
 512       SG_LOG( SG_NETWORK, SG_ALERT, "FGMultiplayMgr::MP_ProcessData - "
 513               << "message has invalid length!" );
 514     }
 515     //////////////////////////////////////////////////
 516     //  Process messages
 517     //////////////////////////////////////////////////
 518     switch (MsgHdr->MsgId) {
 519     case CHAT_MSG_ID:
 520       ProcessChatMsg(Msg, SenderAddress);
 521       break;
 522     case POS_DATA_ID:
 523       ProcessPosMsg(Msg, SenderAddress, bytes, stamp);
 524       break;
 525     case UNUSABLE_POS_DATA_ID:
 526     case OLD_OLD_POS_DATA_ID:
 527     case OLD_PROP_MSG_ID:
 528     case OLD_POS_DATA_ID:
 529       break;
 530     default:
 531       SG_LOG( SG_NETWORK, SG_ALERT, "FGMultiplayMgr::MP_ProcessData - "
 532               << "Unknown message Id received: " << MsgHdr->MsgId );
 533       break;
 534     }
 535   } while (bytes > 0);
 536
 537   // check for expiry
 538   MultiPlayerMap::iterator it = mMultiPlayerMap.begin();
 539   while (it != mMultiPlayerMap.end()) {
 540     if (it->second->getLastTimestamp() + 10 < stamp) {
 541       std::string name = it->first;
 542       it->second->setDie(true);
 543       mMultiPlayerMap.erase(it);
 544       it = mMultiPlayerMap.upper_bound(name);
 545     } else
 546       ++it;
 547   }
 548 } // FGMultiplayMgr::ProcessData(void)
 549 //////////////////////////////////////////////////////////////////////
 550
 551 //////////////////////////////////////////////////////////////////////
 552 //
 553 //  handle a position message
 554 //
 555 //////////////////////////////////////////////////////////////////////
 556 void
 557 FGMultiplayMgr::ProcessPosMsg(const char *Msg, netAddress & SenderAddress,
 558                               unsigned len, long stamp)
 559 {
 560   T_MsgHdr* MsgHdr = (T_MsgHdr *)Msg;
 561   if (MsgHdr->MsgLen < sizeof(T_MsgHdr) + sizeof(T_PositionMsg)) {
 562     SG_LOG( SG_NETWORK, SG_ALERT, "FGMultiplayMgr::MP_ProcessData - "
 563             << "Position message received with insufficient data" );
 564     return;
 565   }
 566   T_PositionMsg* PosMsg = (T_PositionMsg *)(Msg + sizeof(T_MsgHdr));
 567   FGExternalMotionData motionInfo;
 568   motionInfo.time = XDR_decode_double(PosMsg->time);
 569   motionInfo.lag = XDR_decode_double(PosMsg->lag);
 570   for (unsigned i = 0; i < 3; ++i)
 571     motionInfo.position(i) = XDR_decode_double(PosMsg->position[i]);
 572   SGVec3f angleAxis;
 573   for (unsigned i = 0; i < 3; ++i)
 574     angleAxis(i) = XDR_decode_float(PosMsg->orientation[i]);
 575   motionInfo.orientation = SGQuatf::fromAngleAxis(angleAxis);
 576   for (unsigned i = 0; i < 3; ++i)
 577     motionInfo.linearVel(i) = XDR_decode_float(PosMsg->linearVel[i]);
 578   for (unsigned i = 0; i < 3; ++i)
 579     motionInfo.angularVel(i) = XDR_decode_float(PosMsg->angularVel[i]);
 580   for (unsigned i = 0; i < 3; ++i)
 581     motionInfo.linearAccel(i) = XDR_decode_float(PosMsg->linearAccel[i]);
 582   for (unsigned i = 0; i < 3; ++i)
 583     motionInfo.angularAccel(i) = XDR_decode_float(PosMsg->angularAccel[i]);
 584
 585
 586   //cout << "INPUT MESSAGE\n";
 587   xdr_data_t* xdr = (xdr_data_t*)
 588                    (Msg + sizeof(T_MsgHdr) + sizeof(T_PositionMsg));
 589   while ((char*)xdr < Msg + len) {
 590     FGPropertyData* pData = new FGPropertyData;
 591     SGPropertyNode::Type type = SGPropertyNode::UNSPECIFIED;
 592
 593     // First element is always the ID
 594     pData->id = XDR_decode_uint32(*xdr);
 595     //cout << pData->id << " ";
 596     xdr++;
 597
 598     // Check the ID actually exists and get the type
 599     unsigned i = 0;
 600     bool found = false;
 601     while (FGMultiplayMgr::sIdPropertyList[i].name)
 602     {
 603       if (sIdPropertyList[i].id == pData->id)
 604       {
 605         found = true;
 606         pData->type = sIdPropertyList[i].type;
 607       }
 608
 609       i++;
 610     }
 611
 612     if (found == true)
 613     {
 614       // How we decode the remainder of the property depends on the type
 615       switch (pData->type) {
 616         case SGPropertyNode::INT:
 617         case SGPropertyNode::BOOL:
 618         case SGPropertyNode::LONG:
 619           pData->int_value = XDR_decode_uint32(*xdr);
 620           xdr++;
 621           //cout << pData->int_value << "\n";
 622           break;
 623         case SGPropertyNode::FLOAT:
 624         case SGPropertyNode::DOUBLE:
 625           pData->float_value = XDR_decode_float(*xdr);
 626           xdr++;
 627           //cout << pData->float_value << "\n";
 628           break;
 629         case SGPropertyNode::STRING:
 630         case SGPropertyNode::UNSPECIFIED:
 631           {
 632             // String is complicated. It consists of
 633             // The length of the string
 634             // The string itself
 635             // Padding to the nearest 4-bytes.
 636             uint32_t length = XDR_decode_uint32(*xdr);
 637             xdr++;
 638             //cout << length << " ";
 639
 640             if ((length > 0) && (length < MAX_TEXT_SIZE))
 641             {
 642               pData->string_value = new char[length + 1];
 643               //cout << " String: ";
 644
 645               for (int i = 0; i < length; i++)
 646               {
 647                 pData->string_value[i] = (char) XDR_decode_int8(*xdr);
 648                 xdr++;
 649                 //cout << pData->string_value[i];
 650               }
 651
 652               pData->string_value[length] = '\0';
 653
 654               // Now handle the padding
 655               while ((length % 4) != 0)
 656               {
 657                 xdr++;
 658                 length++;
 659                 //cout << "0";
 660               }
 661             }
 662             else
 663             {
 664               pData->string_value = new char[1];
 665               pData->string_value[0] = '\0';
 666             }
 667
 668             //cout << "\n";
 669           }
 670           break;
 671
 672         default:
 673           pData->float_value = XDR_decode_float(*xdr);
 674           cerr << "Unknown Prop type " << pData->id << " " << pData->type << "\n";
 675           xdr++;
 676           break;
 677       }
 678
 679       motionInfo.properties.push_back(pData);
 680     }
 681     else
 682     {
 683       // We failed to find the property. We'll try the next packet immediately.
 684       //cout << " Unknown\n";
 685     }
 686   }
 687
 688   FGAIMultiplayer* mp = getMultiplayer(MsgHdr->Callsign);
 689   if (!mp)
 690     mp = addMultiplayer(MsgHdr->Callsign, PosMsg->Model);
 691   mp->addMotionInfo(motionInfo, stamp);
 692 } // FGMultiplayMgr::ProcessPosMsg()
 693 //////////////////////////////////////////////////////////////////////
 694
 695 //////////////////////////////////////////////////////////////////////
 696 //
 697 //  handle a chat message
 698 //  FIXME: display chat message withi flightgear
 699 //
 700 //////////////////////////////////////////////////////////////////////
 701 void
 702 FGMultiplayMgr::ProcessChatMsg(const char *Msg, netAddress& SenderAddress)
 703 {
 704   T_MsgHdr* MsgHdr = (T_MsgHdr *)Msg;
 705   if (MsgHdr->MsgLen < sizeof(T_MsgHdr) + 1) {
 706     SG_LOG( SG_NETWORK, SG_ALERT, "FGMultiplayMgr::MP_ProcessData - "
 707             << "Chat message received with insufficient data" );
 708     return;
 709   }
 710
 711   char *MsgBuf = new char[MsgHdr->MsgLen - sizeof(T_MsgHdr)];
 712   strncpy(MsgBuf, ((T_ChatMsg *)(Msg + sizeof(T_MsgHdr)))->Text,
 713           MsgHdr->MsgLen - sizeof(T_MsgHdr));
 714   MsgBuf[MsgHdr->MsgLen - sizeof(T_MsgHdr) - 1] = '\0';
 715
 716   T_ChatMsg* ChatMsg = (T_ChatMsg *)(Msg + sizeof(T_MsgHdr));
 717   SG_LOG ( SG_NETWORK, SG_ALERT, "Chat [" << MsgHdr->Callsign << "]"
 718            << " " << MsgBuf << endl);
 719
 720   delete [] MsgBuf;
 721 } // FGMultiplayMgr::ProcessChatMsg ()
 722 //////////////////////////////////////////////////////////////////////
 723
 724 void
 725 FGMultiplayMgr::FillMsgHdr(T_MsgHdr *MsgHdr, int MsgId, unsigned _len)
 726 {
 727   uint32_t len;
 728   switch (MsgId) {
 729   case CHAT_MSG_ID:
 730     len = sizeof(T_MsgHdr) + sizeof(T_ChatMsg);
 731     break;
 732   case POS_DATA_ID:
 733     len = _len;
 734     break;
 735   default:
 736     len = sizeof(T_MsgHdr);
 737     break;
 738   }
 739   MsgHdr->Magic           = XDR_encode_uint32(MSG_MAGIC);
 740   MsgHdr->Version         = XDR_encode_uint32(PROTO_VER);
 741   MsgHdr->MsgId           = XDR_encode_uint32(MsgId);
 742   MsgHdr->MsgLen          = XDR_encode_uint32(len);
 743   MsgHdr->ReplyAddress    = 0; // Are obsolete, keep them for the server for
 744   MsgHdr->ReplyPort       = 0; // now
 745   strncpy(MsgHdr->Callsign, mCallsign.c_str(), MAX_CALLSIGN_LEN);
 746   MsgHdr->Callsign[MAX_CALLSIGN_LEN - 1] = '\0';
 747 }
 748
 749 FGAIMultiplayer*
 750 FGMultiplayMgr::addMultiplayer(const std::string& callsign,
 751                                const std::string& modelName)
 752 {
 753   if (0 < mMultiPlayerMap.count(callsign))
 754     return mMultiPlayerMap[callsign];
 755
 756   FGAIMultiplayer* mp = new FGAIMultiplayer;
 757   mp->setPath(modelName.c_str());
 758   mp->setCallSign(callsign);
 759   mMultiPlayerMap[callsign] = mp;
 760
 761   FGAIManager *aiMgr = (FGAIManager*)globals->get_subsystem("ai_model");
 762   if (aiMgr) {
 763     aiMgr->attach(mp);
 764
 765     /// FIXME: that must follow the attach ATM ...
 766     unsigned i = 0;
 767     while (sIdPropertyList[i].name) {
 768       mp->addPropertyId(sIdPropertyList[i].id, sIdPropertyList[i].name);
 769       ++i;
 770     }
 771   }
 772
 773   return mp;
 774 }
 775
 776 FGAIMultiplayer*
 777 FGMultiplayMgr::getMultiplayer(const std::string& callsign)
 778 {
 779   if (0 < mMultiPlayerMap.count(callsign))
 780     return mMultiPlayerMap[callsign];
 781   else
 782     return 0;
 783 }