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