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 <iostream>
  35 #include <algorithm>
  36 #include <cstring>
  37 #include <osg/Math>             // isNaN
  38 #include <plib/netSocket.h>
  39
  40 #include <simgear/misc/stdint.hxx>
  41 #include <simgear/timing/timestamp.hxx>
  42 #include <simgear/debug/logstream.hxx>
  43 #include <simgear/props/props.hxx>
  44
  45 #include <AIModel/AIManager.hxx>
  46 #include <Main/fg_props.hxx>
  47 #include "multiplaymgr.hxx"
  48 #include "mpmessages.hxx"
  49
  50 using namespace std;
  51
  52 #define MAX_PACKET_SIZE 1200
  53 #define MAX_TEXT_SIZE 128
  54
  55 // These constants are provided so that the ident
  56 // command can list file versions
  57 const char sMULTIPLAYMGR_BID[] = "$Id$";
  58 const char sMULTIPLAYMGR_HID[] = MULTIPLAYTXMGR_HID;
  59
  60 // A static map of protocol property id values to property paths,
  61 // This should be extendable dynamically for every specific aircraft ...
  62 // For now only that static list
  63 const FGMultiplayMgr::IdPropertyList
  64 FGMultiplayMgr::sIdPropertyList[] = {
  65   {100, "surface-positions/left-aileron-pos-norm",  simgear::props::FLOAT},
  66   {101, "surface-positions/right-aileron-pos-norm", simgear::props::FLOAT},
  67   {102, "surface-positions/elevator-pos-norm",      simgear::props::FLOAT},
  68   {103, "surface-positions/rudder-pos-norm",        simgear::props::FLOAT},
  69   {104, "surface-positions/flap-pos-norm",          simgear::props::FLOAT},
  70   {105, "surface-positions/speedbrake-pos-norm",    simgear::props::FLOAT},
  71   {106, "gear/tailhook/position-norm",              simgear::props::FLOAT},
  72   {107, "gear/launchbar/position-norm",             simgear::props::FLOAT},
  73   {108, "gear/launchbar/state",                     simgear::props::STRING},
  74   {109, "gear/launchbar/holdback-position-norm",    simgear::props::FLOAT},
  75   {110, "canopy/position-norm",                     simgear::props::FLOAT},
  76   {111, "surface-positions/wing-pos-norm",          simgear::props::FLOAT},
  77   {112, "surface-positions/wing-fold-pos-norm",     simgear::props::FLOAT},
  78
  79   {200, "gear/gear[0]/compression-norm",           simgear::props::FLOAT},
  80   {201, "gear/gear[0]/position-norm",              simgear::props::FLOAT},
  81   {210, "gear/gear[1]/compression-norm",           simgear::props::FLOAT},
  82   {211, "gear/gear[1]/position-norm",              simgear::props::FLOAT},
  83   {220, "gear/gear[2]/compression-norm",           simgear::props::FLOAT},
  84   {221, "gear/gear[2]/position-norm",              simgear::props::FLOAT},
  85   {230, "gear/gear[3]/compression-norm",           simgear::props::FLOAT},
  86   {231, "gear/gear[3]/position-norm",              simgear::props::FLOAT},
  87   {240, "gear/gear[4]/compression-norm",           simgear::props::FLOAT},
  88   {241, "gear/gear[4]/position-norm",              simgear::props::FLOAT},
  89
  90   {300, "engines/engine[0]/n1",  simgear::props::FLOAT},
  91   {301, "engines/engine[0]/n2",  simgear::props::FLOAT},
  92   {302, "engines/engine[0]/rpm", simgear::props::FLOAT},
  93   {310, "engines/engine[1]/n1",  simgear::props::FLOAT},
  94   {311, "engines/engine[1]/n2",  simgear::props::FLOAT},
  95   {312, "engines/engine[1]/rpm", simgear::props::FLOAT},
  96   {320, "engines/engine[2]/n1",  simgear::props::FLOAT},
  97   {321, "engines/engine[2]/n2",  simgear::props::FLOAT},
  98   {322, "engines/engine[2]/rpm", simgear::props::FLOAT},
  99   {330, "engines/engine[3]/n1",  simgear::props::FLOAT},
 100   {331, "engines/engine[3]/n2",  simgear::props::FLOAT},
 101   {332, "engines/engine[3]/rpm", simgear::props::FLOAT},
 102   {340, "engines/engine[4]/n1",  simgear::props::FLOAT},
 103   {341, "engines/engine[4]/n2",  simgear::props::FLOAT},
 104   {342, "engines/engine[4]/rpm", simgear::props::FLOAT},
 105   {350, "engines/engine[5]/n1",  simgear::props::FLOAT},
 106   {351, "engines/engine[5]/n2",  simgear::props::FLOAT},
 107   {352, "engines/engine[5]/rpm", simgear::props::FLOAT},
 108   {360, "engines/engine[6]/n1",  simgear::props::FLOAT},
 109   {361, "engines/engine[6]/n2",  simgear::props::FLOAT},
 110   {362, "engines/engine[6]/rpm", simgear::props::FLOAT},
 111   {370, "engines/engine[7]/n1",  simgear::props::FLOAT},
 112   {371, "engines/engine[7]/n2",  simgear::props::FLOAT},
 113   {372, "engines/engine[7]/rpm", simgear::props::FLOAT},
 114   {380, "engines/engine[8]/n1",  simgear::props::FLOAT},
 115   {381, "engines/engine[8]/n2",  simgear::props::FLOAT},
 116   {382, "engines/engine[8]/rpm", simgear::props::FLOAT},
 117   {390, "engines/engine[9]/n1",  simgear::props::FLOAT},
 118   {391, "engines/engine[9]/n2",  simgear::props::FLOAT},
 119   {392, "engines/engine[9]/rpm", simgear::props::FLOAT},
 120
 121   {800, "rotors/main/rpm", simgear::props::FLOAT},
 122   {801, "rotors/tail/rpm", simgear::props::FLOAT},
 123   {810, "rotors/main/blade[0]/position-deg",  simgear::props::FLOAT},
 124   {811, "rotors/main/blade[1]/position-deg",  simgear::props::FLOAT},
 125   {812, "rotors/main/blade[2]/position-deg",  simgear::props::FLOAT},
 126   {813, "rotors/main/blade[3]/position-deg",  simgear::props::FLOAT},
 127   {820, "rotors/main/blade[0]/flap-deg",  simgear::props::FLOAT},
 128   {821, "rotors/main/blade[1]/flap-deg",  simgear::props::FLOAT},
 129   {822, "rotors/main/blade[2]/flap-deg",  simgear::props::FLOAT},
 130   {823, "rotors/main/blade[3]/flap-deg",  simgear::props::FLOAT},
 131   {830, "rotors/tail/blade[0]/position-deg",  simgear::props::FLOAT},
 132   {831, "rotors/tail/blade[1]/position-deg",  simgear::props::FLOAT},
 133
 134   {900, "sim/hitches/aerotow/tow/length",                       simgear::props::FLOAT},
 135   {901, "sim/hitches/aerotow/tow/elastic-constant",             simgear::props::FLOAT},
 136   {902, "sim/hitches/aerotow/tow/weight-per-m-kg-m",            simgear::props::FLOAT},
 137   {903, "sim/hitches/aerotow/tow/dist",                         simgear::props::FLOAT},
 138   {904, "sim/hitches/aerotow/tow/connected-to-property-node",   simgear::props::BOOL},
 139   {905, "sim/hitches/aerotow/tow/connected-to-ai-or-mp-callsign",   simgear::props::STRING},
 140   {906, "sim/hitches/aerotow/tow/brake-force",                  simgear::props::FLOAT},
 141   {907, "sim/hitches/aerotow/tow/end-force-x",                  simgear::props::FLOAT},
 142   {908, "sim/hitches/aerotow/tow/end-force-y",                  simgear::props::FLOAT},
 143   {909, "sim/hitches/aerotow/tow/end-force-z",                  simgear::props::FLOAT},
 144   {930, "sim/hitches/aerotow/is-slave",                         simgear::props::BOOL},
 145   {931, "sim/hitches/aerotow/speed-in-tow-direction",           simgear::props::FLOAT},
 146   {932, "sim/hitches/aerotow/open",                             simgear::props::BOOL},
 147   {933, "sim/hitches/aerotow/local-pos-x",                      simgear::props::FLOAT},
 148   {934, "sim/hitches/aerotow/local-pos-y",                      simgear::props::FLOAT},
 149   {935, "sim/hitches/aerotow/local-pos-z",                      simgear::props::FLOAT},
 150
 151   {1001, "controls/flight/slats",  simgear::props::FLOAT},
 152   {1002, "controls/flight/speedbrake",  simgear::props::FLOAT},
 153   {1003, "controls/flight/spoilers",  simgear::props::FLOAT},
 154   {1004, "controls/gear/gear-down",  simgear::props::FLOAT},
 155   {1005, "controls/lighting/nav-lights",  simgear::props::FLOAT},
 156   {1006, "controls/armament/station[0]/jettison-all",  simgear::props::BOOL},
 157
 158   {1100, "sim/model/variant", simgear::props::INT},
 159   {1101, "sim/model/livery/file", simgear::props::STRING},
 160
 161   {1200, "environment/wildfire/data", simgear::props::STRING},
 162   {1201, "environment/contrail", simgear::props::INT},
 163
 164   {1300, "tanker", simgear::props::INT},
 165
 166   {10001, "sim/multiplay/transmission-freq-hz",  simgear::props::STRING},
 167   {10002, "sim/multiplay/chat",  simgear::props::STRING},
 168
 169   {10100, "sim/multiplay/generic/string[0]", simgear::props::STRING},
 170   {10101, "sim/multiplay/generic/string[1]", simgear::props::STRING},
 171   {10102, "sim/multiplay/generic/string[2]", simgear::props::STRING},
 172   {10103, "sim/multiplay/generic/string[3]", simgear::props::STRING},
 173   {10104, "sim/multiplay/generic/string[4]", simgear::props::STRING},
 174   {10105, "sim/multiplay/generic/string[5]", simgear::props::STRING},
 175   {10106, "sim/multiplay/generic/string[6]", simgear::props::STRING},
 176   {10107, "sim/multiplay/generic/string[7]", simgear::props::STRING},
 177   {10108, "sim/multiplay/generic/string[8]", simgear::props::STRING},
 178   {10109, "sim/multiplay/generic/string[9]", simgear::props::STRING},
 179   {10110, "sim/multiplay/generic/string[10]", simgear::props::STRING},
 180   {10111, "sim/multiplay/generic/string[11]", simgear::props::STRING},
 181   {10112, "sim/multiplay/generic/string[12]", simgear::props::STRING},
 182   {10113, "sim/multiplay/generic/string[13]", simgear::props::STRING},
 183   {10114, "sim/multiplay/generic/string[14]", simgear::props::STRING},
 184   {10115, "sim/multiplay/generic/string[15]", simgear::props::STRING},
 185   {10116, "sim/multiplay/generic/string[16]", simgear::props::STRING},
 186   {10117, "sim/multiplay/generic/string[17]", simgear::props::STRING},
 187   {10118, "sim/multiplay/generic/string[18]", simgear::props::STRING},
 188   {10119, "sim/multiplay/generic/string[19]", simgear::props::STRING},
 189
 190   {10200, "sim/multiplay/generic/float[0]", simgear::props::FLOAT},
 191   {10201, "sim/multiplay/generic/float[1]", simgear::props::FLOAT},
 192   {10202, "sim/multiplay/generic/float[2]", simgear::props::FLOAT},
 193   {10203, "sim/multiplay/generic/float[3]", simgear::props::FLOAT},
 194   {10204, "sim/multiplay/generic/float[4]", simgear::props::FLOAT},
 195   {10205, "sim/multiplay/generic/float[5]", simgear::props::FLOAT},
 196   {10206, "sim/multiplay/generic/float[6]", simgear::props::FLOAT},
 197   {10207, "sim/multiplay/generic/float[7]", simgear::props::FLOAT},
 198   {10208, "sim/multiplay/generic/float[8]", simgear::props::FLOAT},
 199   {10209, "sim/multiplay/generic/float[9]", simgear::props::FLOAT},
 200   {10210, "sim/multiplay/generic/float[10]", simgear::props::FLOAT},
 201   {10211, "sim/multiplay/generic/float[11]", simgear::props::FLOAT},
 202   {10212, "sim/multiplay/generic/float[12]", simgear::props::FLOAT},
 203   {10213, "sim/multiplay/generic/float[13]", simgear::props::FLOAT},
 204   {10214, "sim/multiplay/generic/float[14]", simgear::props::FLOAT},
 205   {10215, "sim/multiplay/generic/float[15]", simgear::props::FLOAT},
 206   {10216, "sim/multiplay/generic/float[16]", simgear::props::FLOAT},
 207   {10217, "sim/multiplay/generic/float[17]", simgear::props::FLOAT},
 208   {10218, "sim/multiplay/generic/float[18]", simgear::props::FLOAT},
 209   {10219, "sim/multiplay/generic/float[19]", simgear::props::FLOAT},
 210
 211   {10300, "sim/multiplay/generic/int[0]", simgear::props::INT},
 212   {10301, "sim/multiplay/generic/int[1]", simgear::props::INT},
 213   {10302, "sim/multiplay/generic/int[2]", simgear::props::INT},
 214   {10303, "sim/multiplay/generic/int[3]", simgear::props::INT},
 215   {10304, "sim/multiplay/generic/int[4]", simgear::props::INT},
 216   {10305, "sim/multiplay/generic/int[5]", simgear::props::INT},
 217   {10306, "sim/multiplay/generic/int[6]", simgear::props::INT},
 218   {10307, "sim/multiplay/generic/int[7]", simgear::props::INT},
 219   {10308, "sim/multiplay/generic/int[8]", simgear::props::INT},
 220   {10309, "sim/multiplay/generic/int[9]", simgear::props::INT},
 221   {10310, "sim/multiplay/generic/int[10]", simgear::props::INT},
 222   {10311, "sim/multiplay/generic/int[11]", simgear::props::INT},
 223   {10312, "sim/multiplay/generic/int[12]", simgear::props::INT},
 224   {10313, "sim/multiplay/generic/int[13]", simgear::props::INT},
 225   {10314, "sim/multiplay/generic/int[14]", simgear::props::INT},
 226   {10315, "sim/multiplay/generic/int[15]", simgear::props::INT},
 227   {10316, "sim/multiplay/generic/int[16]", simgear::props::INT},
 228   {10317, "sim/multiplay/generic/int[17]", simgear::props::INT},
 229   {10318, "sim/multiplay/generic/int[18]", simgear::props::INT},
 230   {10319, "sim/multiplay/generic/int[19]", simgear::props::INT}
 231 };
 232
 233 const unsigned
 234 FGMultiplayMgr::numProperties = (sizeof(FGMultiplayMgr::sIdPropertyList)
 235                                  / sizeof(FGMultiplayMgr::sIdPropertyList[0]));
 236
 237 // Look up a property ID using binary search.
 238 namespace
 239 {
 240   struct ComparePropertyId
 241   {
 242     bool operator()(const FGMultiplayMgr::IdPropertyList& lhs,
 243                     const FGMultiplayMgr::IdPropertyList& rhs)
 244     {
 245       return lhs.id < rhs.id;
 246     }
 247     bool operator()(const FGMultiplayMgr::IdPropertyList& lhs,
 248                     unsigned id)
 249     {
 250       return lhs.id < id;
 251     }
 252     bool operator()(unsigned id,
 253                     const FGMultiplayMgr::IdPropertyList& rhs)
 254     {
 255       return id < rhs.id;
 256     }
 257   };
 258
 259 }
 260 const FGMultiplayMgr::IdPropertyList* FGMultiplayMgr::findProperty(unsigned id)
 261 {
 262   std::pair<const IdPropertyList*, const IdPropertyList*> result
 263     = std::equal_range(sIdPropertyList, sIdPropertyList + numProperties, id,
 264                        ComparePropertyId());
 265   if (result.first == result.second) {
 266     return 0;
 267   } else {
 268     return result.first;
 269   }
 270 }
 271
 272 namespace
 273 {
 274   bool verifyProperties(const xdr_data_t* data, const xdr_data_t* end)
 275   {
 276     using namespace simgear;
 277     const xdr_data_t* xdr = data;
 278     while (xdr < end) {
 279       unsigned id = XDR_decode_uint32(*xdr);
 280       const FGMultiplayMgr::IdPropertyList* plist
 281         = FGMultiplayMgr::findProperty(id);
 282
 283       if (plist) {
 284         xdr++;
 285         // How we decode the remainder of the property depends on the type
 286         switch (plist->type) {
 287         case props::INT:
 288         case props::BOOL:
 289         case props::LONG:
 290           xdr++;
 291           break;
 292         case props::FLOAT:
 293         case props::DOUBLE:
 294           {
 295             float val = XDR_decode_float(*xdr);
 296             if (osg::isNaN(val))
 297               return false;
 298             xdr++;
 299             break;
 300           }
 301         case props::STRING:
 302         case props::UNSPECIFIED:
 303           {
 304             // String is complicated. It consists of
 305             // The length of the string
 306             // The string itself
 307             // Padding to the nearest 4-bytes.
 308             // XXX Yes, each byte is padded out to a word! Too late
 309             // to change...
 310             uint32_t length = XDR_decode_uint32(*xdr);
 311             xdr++;
 312             // Old versions truncated the string but left the length
 313             // unadjusted.
 314             if (length > MAX_TEXT_SIZE)
 315               length = MAX_TEXT_SIZE;
 316             xdr += length;
 317             // Now handle the padding
 318             while ((length % 4) != 0)
 319               {
 320                 xdr++;
 321                 length++;
 322                 //cout << "0";
 323               }
 324           }
 325           break;
 326         default:
 327           // cerr << "Unknown Prop type " << id << " " << type << "\n";
 328           xdr++;
 329           break;
 330         }
 331       }
 332       else {
 333         // give up; this is a malformed property list.
 334         return false;
 335       }
 336     }
 337     return true;
 338   }
 339 }
 340 //////////////////////////////////////////////////////////////////////
 341 //
 342 //  MultiplayMgr constructor
 343 //
 344 //////////////////////////////////////////////////////////////////////
 345 FGMultiplayMgr::FGMultiplayMgr()
 346 {
 347   mSocket        = 0;
 348   mInitialised   = false;
 349   mHaveServer    = false;
 350 } // FGMultiplayMgr::FGMultiplayMgr()
 351 //////////////////////////////////////////////////////////////////////
 352
 353 //////////////////////////////////////////////////////////////////////
 354 //
 355 //  MultiplayMgr destructor
 356 //
 357 //////////////////////////////////////////////////////////////////////
 358 FGMultiplayMgr::~FGMultiplayMgr()
 359 {
 360   Close();
 361 } // FGMultiplayMgr::~FGMultiplayMgr()
 362 //////////////////////////////////////////////////////////////////////
 363
 364 //////////////////////////////////////////////////////////////////////
 365 //
 366 //  Initialise object
 367 //
 368 //////////////////////////////////////////////////////////////////////
 369 void
 370 FGMultiplayMgr::init (void)
 371 {
 372   //////////////////////////////////////////////////
 373   //  Initialise object if not already done
 374   //////////////////////////////////////////////////
 375   if (mInitialised) {
 376     SG_LOG(SG_NETWORK, SG_WARN, "FGMultiplayMgr::init - already initialised");
 377     return;
 378   }
 379   //////////////////////////////////////////////////
 380   //  Set members from property values
 381   //////////////////////////////////////////////////
 382   short rxPort = fgGetInt("/sim/multiplay/rxport");
 383   string rxAddress = fgGetString("/sim/multiplay/rxhost");
 384   short txPort = fgGetInt("/sim/multiplay/txport");
 385   string txAddress = fgGetString("/sim/multiplay/txhost");
 386   mCallsign = fgGetString("/sim/multiplay/callsign");
 387   if (txPort > 0 && !txAddress.empty()) {
 388     mServer.set(txAddress.c_str(), txPort);
 389     if (strncmp (mServer.getHost(), "0.0.0.0", 8) == 0) {
 390       mHaveServer = false;
 391       SG_LOG(SG_NETWORK, SG_DEBUG,
 392         "FGMultiplayMgr - could not resolve '"
 393         << txAddress << "', Multiplayermode disabled");
 394     } else {
 395       mHaveServer = true;
 396     }
 397     if (rxPort <= 0)
 398       rxPort = txPort;
 399   }
 400   if (rxPort <= 0) {
 401     SG_LOG(SG_NETWORK, SG_DEBUG,
 402       "FGMultiplayMgr - No receiver port, Multiplayermode disabled");
 403     return;
 404   }
 405   if (mCallsign.empty())
 406     mCallsign = "JohnDoe"; // FIXME: use getpwuid
 407   SG_LOG(SG_NETWORK,SG_INFO,"FGMultiplayMgr::init-txaddress= "<<txAddress);
 408   SG_LOG(SG_NETWORK,SG_INFO,"FGMultiplayMgr::init-txport= "<<txPort );
 409   SG_LOG(SG_NETWORK,SG_INFO,"FGMultiplayMgr::init-rxaddress="<<rxAddress );
 410   SG_LOG(SG_NETWORK,SG_INFO,"FGMultiplayMgr::init-rxport= "<<rxPort);
 411   SG_LOG(SG_NETWORK,SG_INFO,"FGMultiplayMgr::init-callsign= "<<mCallsign);
 412   Close(); // Should Init be called twice, close Socket first
 413            // A memory leak was reported here by valgrind
 414   mSocket = new netSocket();
 415   if (!mSocket->open(false)) {
 416     SG_LOG( SG_NETWORK, SG_DEBUG,
 417             "FGMultiplayMgr::init - Failed to create data socket" );
 418     return;
 419   }
 420   mSocket->setBlocking(false);
 421   if (mSocket->bind(rxAddress.c_str(), rxPort) != 0) {
 422     perror("bind");
 423     SG_LOG( SG_NETWORK, SG_DEBUG,
 424             "FGMultiplayMgr::Open - Failed to bind receive socket" );
 425     return;
 426   }
 427
 428   mInitialised = true;
 429 } // FGMultiplayMgr::init()
 430 //////////////////////////////////////////////////////////////////////
 431
 432 //////////////////////////////////////////////////////////////////////
 433 //
 434 //  Closes and deletes the local player object. Closes
 435 //  and deletes the tx socket. Resets the object state to unitialised.
 436 //
 437 //////////////////////////////////////////////////////////////////////
 438 void
 439 FGMultiplayMgr::Close (void)
 440 {
 441   mMultiPlayerMap.clear();
 442
 443   if (mSocket) {
 444     mSocket->close();
 445     delete mSocket;
 446     mSocket = 0;
 447   }
 448   mInitialised = false;
 449 } // FGMultiplayMgr::Close(void)
 450 //////////////////////////////////////////////////////////////////////
 451
 452 //////////////////////////////////////////////////////////////////////
 453 //
 454 //  Description: Sends the position data for the local position.
 455 //
 456 //////////////////////////////////////////////////////////////////////
 457
 458 /**
 459  * The buffer that holds a multi-player message, suitably aligned.
 460  */
 461 union FGMultiplayMgr::MsgBuf
 462 {
 463     MsgBuf()
 464     {
 465         memset(&Msg, 0, sizeof(Msg));
 466     }
 467
 468     T_MsgHdr* msgHdr()
 469     {
 470         return &Header;
 471     }
 472
 473     const T_MsgHdr* msgHdr() const
 474     {
 475         return reinterpret_cast<const T_MsgHdr*>(&Header);
 476     }
 477
 478     T_PositionMsg* posMsg()
 479     {
 480         return reinterpret_cast<T_PositionMsg*>(Msg + sizeof(T_MsgHdr));
 481     }
 482
 483     const T_PositionMsg* posMsg() const
 484     {
 485         return reinterpret_cast<const T_PositionMsg*>(Msg + sizeof(T_MsgHdr));
 486     }
 487
 488     xdr_data_t* properties()
 489     {
 490         return reinterpret_cast<xdr_data_t*>(Msg + sizeof(T_MsgHdr)
 491                                              + sizeof(T_PositionMsg));
 492     }
 493
 494     const xdr_data_t* properties() const
 495     {
 496         return reinterpret_cast<const xdr_data_t*>(Msg + sizeof(T_MsgHdr)
 497                                                    + sizeof(T_PositionMsg));
 498     }
 499     /**
 500      * The end of the properties buffer.
 501      */
 502     xdr_data_t* propsEnd()
 503     {
 504         return reinterpret_cast<xdr_data_t*>(Msg + MAX_PACKET_SIZE);
 505     };
 506
 507     const xdr_data_t* propsEnd() const
 508     {
 509         return reinterpret_cast<const xdr_data_t*>(Msg + MAX_PACKET_SIZE);
 510     };
 511     /**
 512      * The end of properties actually in the buffer. This assumes that
 513      * the message header is valid.
 514      */
 515     xdr_data_t* propsRecvdEnd()
 516     {
 517         return reinterpret_cast<xdr_data_t*>(Msg + Header.MsgLen);
 518     }
 519
 520     const xdr_data_t* propsRecvdEnd() const
 521     {
 522         return reinterpret_cast<const xdr_data_t*>(Msg + Header.MsgLen);
 523     }
 524
 525     xdr_data2_t double_val;
 526     char Msg[MAX_PACKET_SIZE];
 527     T_MsgHdr Header;
 528 };
 529
 530 void
 531 FGMultiplayMgr::SendMyPosition(const FGExternalMotionData& motionInfo)
 532 {
 533   if ((! mInitialised) || (! mHaveServer))
 534         return;
 535   if (! mHaveServer) {
 536     SG_LOG( SG_NETWORK, SG_DEBUG, "FGMultiplayMgr::SendMyPosition - no server");
 537     return;
 538   }
 539
 540   MsgBuf msgBuf;
 541   T_PositionMsg* PosMsg = msgBuf.posMsg();
 542
 543   strncpy(PosMsg->Model, fgGetString("/sim/model/path"), MAX_MODEL_NAME_LEN);
 544   PosMsg->Model[MAX_MODEL_NAME_LEN - 1] = '\0';
 545
 546   PosMsg->time = XDR_encode_double (motionInfo.time);
 547   PosMsg->lag = XDR_encode_double (motionInfo.lag);
 548   for (unsigned i = 0 ; i < 3; ++i)
 549     PosMsg->position[i] = XDR_encode_double (motionInfo.position(i));
 550   SGVec3f angleAxis;
 551   motionInfo.orientation.getAngleAxis(angleAxis);
 552   for (unsigned i = 0 ; i < 3; ++i)
 553     PosMsg->orientation[i] = XDR_encode_float (angleAxis(i));
 554   for (unsigned i = 0 ; i < 3; ++i)
 555     PosMsg->linearVel[i] = XDR_encode_float (motionInfo.linearVel(i));
 556   for (unsigned i = 0 ; i < 3; ++i)
 557     PosMsg->angularVel[i] = XDR_encode_float (motionInfo.angularVel(i));
 558   for (unsigned i = 0 ; i < 3; ++i)
 559     PosMsg->linearAccel[i] = XDR_encode_float (motionInfo.linearAccel(i));
 560   for (unsigned i = 0 ; i < 3; ++i)
 561     PosMsg->angularAccel[i] = XDR_encode_float (motionInfo.angularAccel(i));
 562
 563   xdr_data_t* ptr = msgBuf.properties();
 564   std::vector<FGPropertyData*>::const_iterator it;
 565   it = motionInfo.properties.begin();
 566   //cout << "OUTPUT PROPERTIES\n";
 567   xdr_data_t* msgEnd = msgBuf.propsEnd();
 568   while (it != motionInfo.properties.end() && ptr + 2 < msgEnd) {
 569
 570     // First element is the ID. Write it out when we know we have room for
 571     // the whole property.
 572     xdr_data_t id =  XDR_encode_uint32((*it)->id);
 573     // The actual data representation depends on the type
 574     switch ((*it)->type) {
 575       case simgear::props::INT:
 576       case simgear::props::BOOL:
 577       case simgear::props::LONG:
 578         *ptr++ = id;
 579         *ptr++ = XDR_encode_uint32((*it)->int_value);
 580         //cout << "Prop:" << (*it)->id << " " << (*it)->type << " "<< (*it)->int_value << "\n";
 581         break;
 582       case simgear::props::FLOAT:
 583       case simgear::props::DOUBLE:
 584         *ptr++ = id;
 585         *ptr++ = XDR_encode_float((*it)->float_value);
 586         //cout << "Prop:" << (*it)->id << " " << (*it)->type << " "<< (*it)->float_value << "\n";
 587         break;
 588       case simgear::props::STRING:
 589       case simgear::props::UNSPECIFIED:
 590         {
 591           // String is complicated. It consists of
 592           // The length of the string
 593           // The string itself
 594           // Padding to the nearest 4-bytes.
 595           const char* lcharptr = (*it)->string_value;
 596
 597           if (lcharptr != 0)
 598           {
 599             // Add the length
 600             ////cout << "String length: " << strlen(lcharptr) << "\n";
 601             uint32_t len = strlen(lcharptr);
 602             if (len > MAX_TEXT_SIZE)
 603               len = MAX_TEXT_SIZE;
 604             // XXX This should not be using 4 bytes per character!
 605             // If there's not enough room for this property, drop it
 606             // on the floor.
 607             if (ptr + 2 + ((len + 3) & ~3) > msgEnd)
 608                 goto escape;
 609             //cout << "String length unint32: " << len << "\n";
 610             *ptr++ = id;
 611             *ptr++ = XDR_encode_uint32(len);
 612             if (len != 0)
 613             {
 614               // Now the text itself
 615               // XXX This should not be using 4 bytes per character!
 616               int lcount = 0;
 617               while ((*lcharptr != '\0') && (lcount < MAX_TEXT_SIZE))
 618               {
 619                 *ptr++ = XDR_encode_int8(*lcharptr);
 620                 lcharptr++;
 621                 lcount++;
 622               }
 623
 624               //cout << "Prop:" << (*it)->id << " " << (*it)->type << " " << len << " " << (*it)->string_value;
 625
 626               // Now pad if required
 627               while ((lcount % 4) != 0)
 628               {
 629                 *ptr++ = XDR_encode_int8(0);
 630                 lcount++;
 631                 //cout << "0";
 632               }
 633
 634               //cout << "\n";
 635             }
 636           }
 637           else
 638           {
 639             // Nothing to encode
 640             *ptr++ = id;
 641             *ptr++ = XDR_encode_uint32(0);
 642             //cout << "Prop:" << (*it)->id << " " << (*it)->type << " 0\n";
 643           }
 644         }
 645         break;
 646
 647       default:
 648         //cout << " Unknown Type: " << (*it)->type << "\n";
 649         *ptr++ = id;
 650         *ptr++ = XDR_encode_float((*it)->float_value);;
 651         //cout << "Prop:" << (*it)->id << " " << (*it)->type << " "<< (*it)->float_value << "\n";
 652         break;
 653     }
 654
 655     ++it;
 656   }
 657 escape:
 658   unsigned msgLen = reinterpret_cast<char*>(ptr) - msgBuf.Msg;
 659   FillMsgHdr(msgBuf.msgHdr(), POS_DATA_ID, msgLen);
 660   mSocket->sendto(msgBuf.Msg, msgLen, 0, &mServer);
 661   SG_LOG(SG_NETWORK, SG_DEBUG, "FGMultiplayMgr::SendMyPosition");
 662 } // FGMultiplayMgr::SendMyPosition()
 663
 664 //////////////////////////////////////////////////////////////////////
 665
 666 //////////////////////////////////////////////////////////////////////
 667 //
 668 //  Name: SendTextMessage
 669 //  Description: Sends a message to the player. The message must
 670 //  contain a valid and correctly filled out header and optional
 671 //  message body.
 672 //
 673 //////////////////////////////////////////////////////////////////////
 674 void
 675 FGMultiplayMgr::SendTextMessage(const string &MsgText)
 676 {
 677   if (!mInitialised || !mHaveServer)
 678     return;
 679
 680   T_MsgHdr MsgHdr;
 681   FillMsgHdr(&MsgHdr, CHAT_MSG_ID);
 682   //////////////////////////////////////////////////
 683   // Divide the text string into blocks that fit
 684   // in the message and send the blocks.
 685   //////////////////////////////////////////////////
 686   unsigned iNextBlockPosition = 0;
 687   T_ChatMsg ChatMsg;
 688
 689   char Msg[sizeof(T_MsgHdr) + sizeof(T_ChatMsg)];
 690   while (iNextBlockPosition < MsgText.length()) {
 691     strncpy (ChatMsg.Text,
 692              MsgText.substr(iNextBlockPosition, MAX_CHAT_MSG_LEN - 1).c_str(),
 693              MAX_CHAT_MSG_LEN);
 694     ChatMsg.Text[MAX_CHAT_MSG_LEN - 1] = '\0';
 695     memcpy (Msg, &MsgHdr, sizeof(T_MsgHdr));
 696     memcpy (Msg + sizeof(T_MsgHdr), &ChatMsg, sizeof(T_ChatMsg));
 697     mSocket->sendto (Msg, sizeof(T_MsgHdr) + sizeof(T_ChatMsg), 0, &mServer);
 698     iNextBlockPosition += MAX_CHAT_MSG_LEN - 1;
 699
 700   }
 701
 702
 703 } // FGMultiplayMgr::SendTextMessage ()
 704 //////////////////////////////////////////////////////////////////////
 705
 706 //////////////////////////////////////////////////////////////////////
 707 //
 708 //  Name: ProcessData
 709 //  Description: Processes data waiting at the receive socket. The
 710 //  processing ends when there is no more data at the socket.
 711 //
 712 //////////////////////////////////////////////////////////////////////
 713 void
 714 FGMultiplayMgr::update(double)
 715 {
 716   if (!mInitialised)
 717     return;
 718
 719   /// Just for expiry
 720   long stamp = SGTimeStamp::now().getSeconds();
 721
 722   //////////////////////////////////////////////////
 723   //  Read the receive socket and process any data
 724   //////////////////////////////////////////////////
 725   ssize_t bytes;
 726   do {
 727     MsgBuf msgBuf;
 728     //////////////////////////////////////////////////
 729     //  Although the recv call asks for
 730     //  MAX_PACKET_SIZE of data, the number of bytes
 731     //  returned will only be that of the next
 732     //  packet waiting to be processed.
 733     //////////////////////////////////////////////////
 734     netAddress SenderAddress;
 735     bytes = mSocket->recvfrom(msgBuf.Msg, sizeof(msgBuf.Msg), 0,
 736                               &SenderAddress);
 737     //////////////////////////////////////////////////
 738     //  no Data received
 739     //////////////////////////////////////////////////
 740     if (bytes <= 0) {
 741       if (errno != EAGAIN && errno != 0) // MSVC output "NoError" otherwise
 742         perror("FGMultiplayMgr::MP_ProcessData");
 743       break;
 744     }
 745     if (bytes <= static_cast<ssize_t>(sizeof(T_MsgHdr))) {
 746       SG_LOG( SG_NETWORK, SG_DEBUG, "FGMultiplayMgr::MP_ProcessData - "
 747               << "received message with insufficient data" );
 748       break;
 749     }
 750     //////////////////////////////////////////////////
 751     //  Read header
 752     //////////////////////////////////////////////////
 753     T_MsgHdr* MsgHdr = msgBuf.msgHdr();
 754     MsgHdr->Magic       = XDR_decode_uint32 (MsgHdr->Magic);
 755     MsgHdr->Version     = XDR_decode_uint32 (MsgHdr->Version);
 756     MsgHdr->MsgId       = XDR_decode_uint32 (MsgHdr->MsgId);
 757     MsgHdr->MsgLen      = XDR_decode_uint32 (MsgHdr->MsgLen);
 758     MsgHdr->ReplyPort   = XDR_decode_uint32 (MsgHdr->ReplyPort);
 759     MsgHdr->Callsign[MAX_CALLSIGN_LEN -1] = '\0';
 760     if (MsgHdr->Magic != MSG_MAGIC) {
 761       SG_LOG( SG_NETWORK, SG_DEBUG, "FGMultiplayMgr::MP_ProcessData - "
 762               << "message has invalid magic number!" );
 763       break;
 764     }
 765     if (MsgHdr->Version != PROTO_VER) {
 766       SG_LOG( SG_NETWORK, SG_DEBUG, "FGMultiplayMgr::MP_ProcessData - "
 767               << "message has invalid protocoll number!" );
 768       break;
 769     }
 770     if (MsgHdr->MsgLen != bytes) {
 771       SG_LOG(SG_NETWORK, SG_DEBUG, "FGMultiplayMgr::MP_ProcessData - "
 772              << "message from " << MsgHdr->Callsign << " has invalid length!");
 773       break;
 774     }
 775     //////////////////////////////////////////////////
 776     //  Process messages
 777     //////////////////////////////////////////////////
 778     switch (MsgHdr->MsgId) {
 779     case CHAT_MSG_ID:
 780       ProcessChatMsg(msgBuf, SenderAddress);
 781       break;
 782     case POS_DATA_ID:
 783       ProcessPosMsg(msgBuf, SenderAddress, stamp);
 784       break;
 785     case UNUSABLE_POS_DATA_ID:
 786     case OLD_OLD_POS_DATA_ID:
 787     case OLD_PROP_MSG_ID:
 788     case OLD_POS_DATA_ID:
 789       break;
 790     default:
 791       SG_LOG( SG_NETWORK, SG_DEBUG, "FGMultiplayMgr::MP_ProcessData - "
 792               << "Unknown message Id received: " << MsgHdr->MsgId );
 793       break;
 794     }
 795   } while (bytes > 0);
 796
 797   // check for expiry
 798   MultiPlayerMap::iterator it = mMultiPlayerMap.begin();
 799   while (it != mMultiPlayerMap.end()) {
 800     if (it->second->getLastTimestamp() + 10 < stamp) {
 801       std::string name = it->first;
 802       it->second->setDie(true);
 803       mMultiPlayerMap.erase(it);
 804       it = mMultiPlayerMap.upper_bound(name);
 805     } else
 806       ++it;
 807   }
 808 } // FGMultiplayMgr::ProcessData(void)
 809 //////////////////////////////////////////////////////////////////////
 810
 811 //////////////////////////////////////////////////////////////////////
 812 //
 813 //  handle a position message
 814 //
 815 //////////////////////////////////////////////////////////////////////
 816 void
 817 FGMultiplayMgr::ProcessPosMsg(const FGMultiplayMgr::MsgBuf& Msg,
 818                               const netAddress& SenderAddress, long stamp)
 819 {
 820   const T_MsgHdr* MsgHdr = Msg.msgHdr();
 821   if (MsgHdr->MsgLen < sizeof(T_MsgHdr) + sizeof(T_PositionMsg)) {
 822     SG_LOG( SG_NETWORK, SG_DEBUG, "FGMultiplayMgr::MP_ProcessData - "
 823             << "Position message received with insufficient data" );
 824     return;
 825   }
 826   const T_PositionMsg* PosMsg = Msg.posMsg();
 827   FGExternalMotionData motionInfo;
 828   motionInfo.time = XDR_decode_double(PosMsg->time);
 829   motionInfo.lag = XDR_decode_double(PosMsg->lag);
 830   for (unsigned i = 0; i < 3; ++i)
 831     motionInfo.position(i) = XDR_decode_double(PosMsg->position[i]);
 832   SGVec3f angleAxis;
 833   for (unsigned i = 0; i < 3; ++i)
 834     angleAxis(i) = XDR_decode_float(PosMsg->orientation[i]);
 835   motionInfo.orientation = SGQuatf::fromAngleAxis(angleAxis);
 836   for (unsigned i = 0; i < 3; ++i)
 837     motionInfo.linearVel(i) = XDR_decode_float(PosMsg->linearVel[i]);
 838   for (unsigned i = 0; i < 3; ++i)
 839     motionInfo.angularVel(i) = XDR_decode_float(PosMsg->angularVel[i]);
 840   for (unsigned i = 0; i < 3; ++i)
 841     motionInfo.linearAccel(i) = XDR_decode_float(PosMsg->linearAccel[i]);
 842   for (unsigned i = 0; i < 3; ++i)
 843     motionInfo.angularAccel(i) = XDR_decode_float(PosMsg->angularAccel[i]);
 844
 845
 846   //cout << "INPUT MESSAGE\n";
 847
 848   // There was a bug in 1.9.0 and before: T_PositionMsg was 196 bytes
 849   // on 32 bit architectures and 200 bytes on 64 bit, and this
 850   // structure is put directly on the wire. By looking at the padding,
 851   // we can sort through the mess, mostly:
 852   // If padding is 0 (which is not a valid property type), then the
 853   // message was produced by a new client or an old 64 bit client that
 854   // happened to have 0 on the stack;
 855   // Else if the property list starting with the padding word is
 856   // well-formed, then the client is probably an old 32 bit client and
 857   // we'll go with that;
 858   // Else it is an old 64-bit client and properties start after the
 859   // padding.
 860   // There is a chance that we could be fooled by garbage in the
 861   // padding looking like a valid property, so verifyProperties() is
 862   // strict about the validity of the property values.
 863   const xdr_data_t* xdr = Msg.properties();
 864   if (PosMsg->pad != 0) {
 865     if (verifyProperties(&PosMsg->pad, Msg.propsRecvdEnd()))
 866       xdr = &PosMsg->pad;
 867     else if (!verifyProperties(xdr, Msg.propsRecvdEnd()))
 868       goto noprops;
 869   }
 870   while (xdr < Msg.propsRecvdEnd()) {
 871     FGPropertyData* pData = new FGPropertyData;
 872     // simgear::props::Type type = simgear::props::UNSPECIFIED;
 873
 874     // First element is always the ID
 875     pData->id = XDR_decode_uint32(*xdr);
 876     //cout << pData->id << " ";
 877     xdr++;
 878
 879     // Check the ID actually exists and get the type
 880     const IdPropertyList* plist = findProperty(pData->id);
 881
 882     if (plist)
 883     {
 884       pData->type = plist->type;
 885       // How we decode the remainder of the property depends on the type
 886       switch (pData->type) {
 887         case simgear::props::INT:
 888         case simgear::props::BOOL:
 889         case simgear::props::LONG:
 890           pData->int_value = XDR_decode_uint32(*xdr);
 891           xdr++;
 892           //cout << pData->int_value << "\n";
 893           break;
 894         case simgear::props::FLOAT:
 895         case simgear::props::DOUBLE:
 896           pData->float_value = XDR_decode_float(*xdr);
 897           xdr++;
 898           //cout << pData->float_value << "\n";
 899           break;
 900         case simgear::props::STRING:
 901         case simgear::props::UNSPECIFIED:
 902           {
 903             // String is complicated. It consists of
 904             // The length of the string
 905             // The string itself
 906             // Padding to the nearest 4-bytes.
 907             uint32_t length = XDR_decode_uint32(*xdr);
 908             xdr++;
 909             //cout << length << " ";
 910             // Old versions truncated the string but left the length unadjusted.
 911             if (length > MAX_TEXT_SIZE)
 912               length = MAX_TEXT_SIZE;
 913             pData->string_value = new char[length + 1];
 914             //cout << " String: ";
 915             for (unsigned i = 0; i < length; i++)
 916               {
 917                 pData->string_value[i] = (char) XDR_decode_int8(*xdr);
 918                 xdr++;
 919                 //cout << pData->string_value[i];
 920               }
 921
 922             pData->string_value[length] = '\0';
 923
 924             // Now handle the padding
 925             while ((length % 4) != 0)
 926               {
 927                 xdr++;
 928                 length++;
 929                 //cout << "0";
 930               }
 931             //cout << "\n";
 932           }
 933           break;
 934
 935         default:
 936           pData->float_value = XDR_decode_float(*xdr);
 937           SG_LOG(SG_NETWORK, SG_DEBUG, "Unknown Prop type " << pData->id << " " << pData->type);
 938           xdr++;
 939           break;
 940       }
 941
 942       motionInfo.properties.push_back(pData);
 943     }
 944     else
 945     {
 946       // We failed to find the property. We'll try the next packet immediately.
 947       SG_LOG(SG_NETWORK, SG_INFO, "FGMultiplayMgr::ProcessPosMsg - "
 948              "message from " << MsgHdr->Callsign << " has unknown property id "
 949              << pData->id);
 950     }
 951   }
 952  noprops:
 953   FGAIMultiplayer* mp = getMultiplayer(MsgHdr->Callsign);
 954   if (!mp)
 955     mp = addMultiplayer(MsgHdr->Callsign, PosMsg->Model);
 956   mp->addMotionInfo(motionInfo, stamp);
 957 } // FGMultiplayMgr::ProcessPosMsg()
 958 //////////////////////////////////////////////////////////////////////
 959
 960 //////////////////////////////////////////////////////////////////////
 961 //
 962 //  handle a chat message
 963 //  FIXME: display chat message withi flightgear
 964 //
 965 //////////////////////////////////////////////////////////////////////
 966 void
 967 FGMultiplayMgr::ProcessChatMsg(const MsgBuf& Msg,
 968                                const netAddress& SenderAddress)
 969 {
 970   const T_MsgHdr* MsgHdr = Msg.msgHdr();
 971   if (MsgHdr->MsgLen < sizeof(T_MsgHdr) + 1) {
 972     SG_LOG( SG_NETWORK, SG_DEBUG, "FGMultiplayMgr::MP_ProcessData - "
 973             << "Chat message received with insufficient data" );
 974     return;
 975   }
 976
 977   char *chatStr = new char[MsgHdr->MsgLen - sizeof(T_MsgHdr)];
 978   const T_ChatMsg* ChatMsg
 979       = reinterpret_cast<const T_ChatMsg *>(Msg.Msg + sizeof(T_MsgHdr));
 980   strncpy(chatStr, ChatMsg->Text,
 981           MsgHdr->MsgLen - sizeof(T_MsgHdr));
 982   chatStr[MsgHdr->MsgLen - sizeof(T_MsgHdr) - 1] = '\0';
 983
 984   SG_LOG (SG_NETWORK, SG_WARN, "Chat [" << MsgHdr->Callsign << "]"
 985            << " " << chatStr);
 986
 987   delete [] chatStr;
 988 } // FGMultiplayMgr::ProcessChatMsg ()
 989 //////////////////////////////////////////////////////////////////////
 990
 991 void
 992 FGMultiplayMgr::FillMsgHdr(T_MsgHdr *MsgHdr, int MsgId, unsigned _len)
 993 {
 994   uint32_t len;
 995   switch (MsgId) {
 996   case CHAT_MSG_ID:
 997     len = sizeof(T_MsgHdr) + sizeof(T_ChatMsg);
 998     break;
 999   case POS_DATA_ID:
1000     len = _len;
1001     break;
1002   default:
1003     len = sizeof(T_MsgHdr);
1004     break;
1005   }
1006   MsgHdr->Magic           = XDR_encode_uint32(MSG_MAGIC);
1007   MsgHdr->Version         = XDR_encode_uint32(PROTO_VER);
1008   MsgHdr->MsgId           = XDR_encode_uint32(MsgId);
1009   MsgHdr->MsgLen          = XDR_encode_uint32(len);
1010   MsgHdr->ReplyAddress    = 0; // Are obsolete, keep them for the server for
1011   MsgHdr->ReplyPort       = 0; // now
1012   strncpy(MsgHdr->Callsign, mCallsign.c_str(), MAX_CALLSIGN_LEN);
1013   MsgHdr->Callsign[MAX_CALLSIGN_LEN - 1] = '\0';
1014 }
1015
1016 FGAIMultiplayer*
1017 FGMultiplayMgr::addMultiplayer(const std::string& callsign,
1018                                const std::string& modelName)
1019 {
1020   if (0 < mMultiPlayerMap.count(callsign))
1021     return mMultiPlayerMap[callsign].get();
1022
1023   FGAIMultiplayer* mp = new FGAIMultiplayer;
1024   mp->setPath(modelName.c_str());
1025   mp->setCallSign(callsign);
1026   mMultiPlayerMap[callsign] = mp;
1027
1028   FGAIManager *aiMgr = (FGAIManager*)globals->get_subsystem("ai_model");
1029   if (aiMgr) {
1030     aiMgr->attach(mp);
1031
1032     /// FIXME: that must follow the attach ATM ...
1033     for (unsigned i = 0; i < numProperties; ++i)
1034       mp->addPropertyId(sIdPropertyList[i].id, sIdPropertyList[i].name);
1035   }
1036
1037   return mp;
1038 }
1039
1040 FGAIMultiplayer*
1041 FGMultiplayMgr::getMultiplayer(const std::string& callsign)
1042 {
1043   if (0 < mMultiPlayerMap.count(callsign))
1044     return mMultiPlayerMap[callsign].get();
1045   else
1046     return 0;
1047 }