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