src/MultiPlayer/multiplaymgr.cxx

   1 //////////////////////////////////////////////////////////////////////
   2 //
   3 // multiplaymgr.hpp
   4 //
   5 // Written by Duncan McCreanor, started February 2003.
   6 // duncan.mccreanor@airservicesaustralia.com
   7 //
   8 // Copyright (C) 2003  Airservices Australia
   9 // Copyright (C) 2005  Oliver Schroeder
  10 // Copyright (C) 2006  Mathias Froehlich
  11 //
  12 // This program is free software; you can redistribute it and/or
  13 // modify it under the terms of the GNU General Public License as
  14 // published by the Free Software Foundation; either version 2 of the
  15 // License, or (at your option) any later version.
  16 //
  17 // This program is distributed in the hope that it will be useful, but
  18 // WITHOUT ANY WARRANTY; without even the implied warranty of
  19 // MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  20 // General Public License for more details.
  21 //
  22 // You should have received a copy of the GNU General Public License
  23 // along with this program; if not, write to the Free Software
  24 // Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301, USA.
  25 //
  26 // $Id$
  27 //
  28 //////////////////////////////////////////////////////////////////////
  29
  30 #ifdef HAVE_CONFIG_H
  31 #include <config.h>
  32 #endif
  33
  34 #include <plib/netSocket.h>
  35
  36 #include <simgear/misc/stdint.hxx>
  37 #include <simgear/timing/timestamp.hxx>
  38 #include <simgear/debug/logstream.hxx>
  39 #include <simgear/props/props.hxx>
  40
  41 #include <AIModel/AIManager.hxx>
  42 #include <Main/fg_props.hxx>
  43 #include "multiplaymgr.hxx"
  44 #include "mpmessages.hxx"
  45
  46 #define MAX_PACKET_SIZE 1200
  47 #define MAX_TEXT_SIZE 128
  48
  49 // These constants are provided so that the ident
  50 // command can list file versions
  51 const char sMULTIPLAYMGR_BID[] = "$Id$";
  52 const char sMULTIPLAYMGR_HID[] = MULTIPLAYTXMGR_HID;
  53
  54 // A static map of protocol property id values to property paths,
  55 // This should be extendable dynamically for every specific aircraft ...
  56 // For now only that static list
  57 FGMultiplayMgr::IdPropertyList
  58 FGMultiplayMgr::sIdPropertyList[] = {
  59   {100, "surface-positions/left-aileron-pos-norm",  SGPropertyNode::FLOAT},
  60   {101, "surface-positions/right-aileron-pos-norm", SGPropertyNode::FLOAT},
  61   {102, "surface-positions/elevator-pos-norm",      SGPropertyNode::FLOAT},
  62   {103, "surface-positions/rudder-pos-norm",        SGPropertyNode::FLOAT},
  63   {104, "surface-positions/flap-pos-norm",          SGPropertyNode::FLOAT},
  64   {105, "surface-positions/speedbrake-pos-norm",    SGPropertyNode::FLOAT},
  65   {106, "gear/tailhook/position-norm",              SGPropertyNode::FLOAT},
  66   {107, "gear/launchbar/position-norm",             SGPropertyNode::FLOAT},
  67   {108, "gear/launchbar/state",                     SGPropertyNode::STRING},
  68   {109, "gear/launchbar/holdback-position-norm",    SGPropertyNode::FLOAT},
  69   {110, "canopy/position-norm",                     SGPropertyNode::FLOAT},
  70
  71   {200, "gear/gear[0]/compression-norm",           SGPropertyNode::FLOAT},
  72   {201, "gear/gear[0]/position-norm",              SGPropertyNode::FLOAT},
  73   {210, "gear/gear[1]/compression-norm",           SGPropertyNode::FLOAT},
  74   {211, "gear/gear[1]/position-norm",              SGPropertyNode::FLOAT},
  75   {220, "gear/gear[2]/compression-norm",           SGPropertyNode::FLOAT},
  76   {221, "gear/gear[2]/position-norm",              SGPropertyNode::FLOAT},
  77   {230, "gear/gear[3]/compression-norm",           SGPropertyNode::FLOAT},
  78   {231, "gear/gear[3]/position-norm",              SGPropertyNode::FLOAT},
  79   {240, "gear/gear[4]/compression-norm",           SGPropertyNode::FLOAT},
  80   {241, "gear/gear[4]/position-norm",              SGPropertyNode::FLOAT},
  81
  82   {300, "engines/engine[0]/n1",  SGPropertyNode::FLOAT},
  83   {301, "engines/engine[0]/n2",  SGPropertyNode::FLOAT},
  84   {302, "engines/engine[0]/rpm", SGPropertyNode::FLOAT},
  85   {310, "engines/engine[1]/n1",  SGPropertyNode::FLOAT},
  86   {311, "engines/engine[1]/n2",  SGPropertyNode::FLOAT},
  87   {312, "engines/engine[1]/rpm", SGPropertyNode::FLOAT},
  88   {320, "engines/engine[2]/n1",  SGPropertyNode::FLOAT},
  89   {321, "engines/engine[2]/n2",  SGPropertyNode::FLOAT},
  90   {322, "engines/engine[2]/rpm", SGPropertyNode::FLOAT},
  91   {330, "engines/engine[3]/n1",  SGPropertyNode::FLOAT},
  92   {331, "engines/engine[3]/n2",  SGPropertyNode::FLOAT},
  93   {332, "engines/engine[3]/rpm", SGPropertyNode::FLOAT},
  94   {340, "engines/engine[4]/n1",  SGPropertyNode::FLOAT},
  95   {341, "engines/engine[4]/n2",  SGPropertyNode::FLOAT},
  96   {342, "engines/engine[4]/rpm", SGPropertyNode::FLOAT},
  97   {350, "engines/engine[5]/n1",  SGPropertyNode::FLOAT},
  98   {351, "engines/engine[5]/n2",  SGPropertyNode::FLOAT},
  99   {352, "engines/engine[5]/rpm", SGPropertyNode::FLOAT},
 100   {360, "engines/engine[6]/n1",  SGPropertyNode::FLOAT},
 101   {361, "engines/engine[6]/n2",  SGPropertyNode::FLOAT},
 102   {362, "engines/engine[6]/rpm", SGPropertyNode::FLOAT},
 103   {370, "engines/engine[7]/n1",  SGPropertyNode::FLOAT},
 104   {371, "engines/engine[7]/n2",  SGPropertyNode::FLOAT},
 105   {372, "engines/engine[7]/rpm", SGPropertyNode::FLOAT},
 106   {380, "engines/engine[8]/n1",  SGPropertyNode::FLOAT},
 107   {381, "engines/engine[8]/n2",  SGPropertyNode::FLOAT},
 108   {382, "engines/engine[8]/rpm", SGPropertyNode::FLOAT},
 109   {390, "engines/engine[9]/n1",  SGPropertyNode::FLOAT},
 110   {391, "engines/engine[9]/n2",  SGPropertyNode::FLOAT},
 111   {392, "engines/engine[9]/rpm", SGPropertyNode::FLOAT},
 112
 113   {800, "rotors/main/rpm", SGPropertyNode::FLOAT},
 114   {801, "rotors/tail/rpm", SGPropertyNode::FLOAT},
 115   {810, "rotors/main/blade[0]/position-deg",  SGPropertyNode::FLOAT},
 116   {811, "rotors/main/blade[1]/position-deg",  SGPropertyNode::FLOAT},
 117   {812, "rotors/main/blade[2]/position-deg",  SGPropertyNode::FLOAT},
 118   {813, "rotors/main/blade[3]/position-deg",  SGPropertyNode::FLOAT},
 119   {820, "rotors/main/blade[0]/flap-deg",  SGPropertyNode::FLOAT},
 120   {821, "rotors/main/blade[1]/flap-deg",  SGPropertyNode::FLOAT},
 121   {822, "rotors/main/blade[2]/flap-deg",  SGPropertyNode::FLOAT},
 122   {823, "rotors/main/blade[3]/flap-deg",  SGPropertyNode::FLOAT},
 123   {830, "rotors/tail/blade[0]/position-deg",  SGPropertyNode::FLOAT},
 124   {831, "rotors/tail/blade[1]/position-deg",  SGPropertyNode::FLOAT},
 125
 126   {900, "sim/hitches/aerotow/tow/length",                       SGPropertyNode::FLOAT},
 127   {901, "sim/hitches/aerotow/tow/elastic-constant",             SGPropertyNode::FLOAT},
 128   {902, "sim/hitches/aerotow/tow/weight-per-m-kg-m",            SGPropertyNode::FLOAT},
 129   {903, "sim/hitches/aerotow/tow/dist",                         SGPropertyNode::FLOAT},
 130   {904, "sim/hitches/aerotow/tow/connected-to-property-node",   SGPropertyNode::BOOL},
 131   {905, "sim/hitches/aerotow/tow/connected-to-ai-or-mp-callsign",   SGPropertyNode::STRING},
 132   {906, "sim/hitches/aerotow/tow/brake-force",                  SGPropertyNode::FLOAT},
 133   {907, "sim/hitches/aerotow/tow/end-force-x",                  SGPropertyNode::FLOAT},
 134   {908, "sim/hitches/aerotow/tow/end-force-y",                  SGPropertyNode::FLOAT},
 135   {909, "sim/hitches/aerotow/tow/end-force-z",                  SGPropertyNode::FLOAT},
 136   {930, "sim/hitches/aerotow/is-slave",                         SGPropertyNode::BOOL},
 137   {931, "sim/hitches/aerotow/speed-in-tow-direction",           SGPropertyNode::FLOAT},
 138   {932, "sim/hitches/aerotow/open",                             SGPropertyNode::BOOL},
 139   {933, "sim/hitches/aerotow/local-pos-x",                      SGPropertyNode::FLOAT},
 140   {934, "sim/hitches/aerotow/local-pos-y",                      SGPropertyNode::FLOAT},
 141   {935, "sim/hitches/aerotow/local-pos-z",                      SGPropertyNode::FLOAT},
 142
 143   {1001, "controls/flight/slats",  SGPropertyNode::FLOAT},
 144   {1002, "controls/flight/speedbrake",  SGPropertyNode::FLOAT},
 145   {1003, "controls/flight/spoilers",  SGPropertyNode::FLOAT},
 146   {1004, "controls/gear/gear-down",  SGPropertyNode::FLOAT},
 147   {1005, "controls/lighting/nav-lights",  SGPropertyNode::FLOAT},
 148   {1006, "controls/armament/station[0]/jettison-all",  SGPropertyNode::BOOL},
 149
 150   {1100, "sim/model/variant", SGPropertyNode::INT},
 151   {1101, "sim/model/livery/file", SGPropertyNode::STRING},
 152
 153   {10001, "sim/multiplay/transmission-freq-hz",  SGPropertyNode::STRING},
 154   {10002, "sim/multiplay/chat",  SGPropertyNode::STRING},
 155
 156   {10100, "sim/multiplay/generic/string[0]", SGPropertyNode::STRING},
 157   {10101, "sim/multiplay/generic/string[1]", SGPropertyNode::STRING},
 158   {10102, "sim/multiplay/generic/string[2]", SGPropertyNode::STRING},
 159   {10103, "sim/multiplay/generic/string[3]", SGPropertyNode::STRING},
 160   {10104, "sim/multiplay/generic/string[4]", SGPropertyNode::STRING},
 161   {10105, "sim/multiplay/generic/string[5]", SGPropertyNode::STRING},
 162   {10106, "sim/multiplay/generic/string[6]", SGPropertyNode::STRING},
 163   {10107, "sim/multiplay/generic/string[7]", SGPropertyNode::STRING},
 164   {10108, "sim/multiplay/generic/string[8]", SGPropertyNode::STRING},
 165   {10109, "sim/multiplay/generic/string[9]", SGPropertyNode::STRING},
 166
 167   {10200, "sim/multiplay/generic/float[0]", SGPropertyNode::FLOAT},
 168   {10201, "sim/multiplay/generic/float[1]", SGPropertyNode::FLOAT},
 169   {10202, "sim/multiplay/generic/float[2]", SGPropertyNode::FLOAT},
 170   {10203, "sim/multiplay/generic/float[3]", SGPropertyNode::FLOAT},
 171   {10204, "sim/multiplay/generic/float[4]", SGPropertyNode::FLOAT},
 172   {10205, "sim/multiplay/generic/float[5]", SGPropertyNode::FLOAT},
 173   {10206, "sim/multiplay/generic/float[6]", SGPropertyNode::FLOAT},
 174   {10207, "sim/multiplay/generic/float[7]", SGPropertyNode::FLOAT},
 175   {10208, "sim/multiplay/generic/float[8]", SGPropertyNode::FLOAT},
 176   {10209, "sim/multiplay/generic/float[9]", SGPropertyNode::FLOAT},
 177
 178   {10300, "sim/multiplay/generic/int[0]", SGPropertyNode::INT},
 179   {10301, "sim/multiplay/generic/int[1]", SGPropertyNode::INT},
 180   {10302, "sim/multiplay/generic/int[2]", SGPropertyNode::INT},
 181   {10303, "sim/multiplay/generic/int[3]", SGPropertyNode::INT},
 182   {10304, "sim/multiplay/generic/int[4]", SGPropertyNode::INT},
 183   {10305, "sim/multiplay/generic/int[5]", SGPropertyNode::INT},
 184   {10306, "sim/multiplay/generic/int[6]", SGPropertyNode::INT},
 185   {10307, "sim/multiplay/generic/int[7]", SGPropertyNode::INT},
 186   {10308, "sim/multiplay/generic/int[8]", SGPropertyNode::INT},
 187   {10309, "sim/multiplay/generic/int[9]", SGPropertyNode::INT},
 188
 189   /// termination
 190   {0, 0, SGPropertyNode::UNSPECIFIED}
 191 };
 192
 193 //////////////////////////////////////////////////////////////////////
 194 //
 195 //  MultiplayMgr constructor
 196 //
 197 //////////////////////////////////////////////////////////////////////
 198 FGMultiplayMgr::FGMultiplayMgr()
 199 {
 200   mSocket        = 0;
 201   mInitialised   = false;
 202   mHaveServer    = false;
 203 } // FGMultiplayMgr::FGMultiplayMgr()
 204 //////////////////////////////////////////////////////////////////////
 205
 206 //////////////////////////////////////////////////////////////////////
 207 //
 208 //  MultiplayMgr destructor
 209 //
 210 //////////////////////////////////////////////////////////////////////
 211 FGMultiplayMgr::~FGMultiplayMgr()
 212 {
 213   Close();
 214 } // FGMultiplayMgr::~FGMultiplayMgr()
 215 //////////////////////////////////////////////////////////////////////
 216
 217 //////////////////////////////////////////////////////////////////////
 218 //
 219 //  Initialise object
 220 //
 221 //////////////////////////////////////////////////////////////////////
 222 bool
 223 FGMultiplayMgr::init (void)
 224 {
 225   //////////////////////////////////////////////////
 226   //  Initialise object if not already done
 227   //////////////////////////////////////////////////
 228   if (mInitialised) {
 229     SG_LOG(SG_NETWORK, SG_WARN, "FGMultiplayMgr::init - already initialised");
 230     return false;
 231   }
 232   //////////////////////////////////////////////////
 233   //  Set members from property values
 234   //////////////////////////////////////////////////
 235   short rxPort = fgGetInt("/sim/multiplay/rxport");
 236   string rxAddress = fgGetString("/sim/multiplay/rxhost");
 237   short txPort = fgGetInt("/sim/multiplay/txport");
 238   string txAddress = fgGetString("/sim/multiplay/txhost");
 239   mCallsign = fgGetString("/sim/multiplay/callsign");
 240   if (txPort > 0 && !txAddress.empty()) {
 241     mServer.set(txAddress.c_str(), txPort);
 242     if (strncmp (mServer.getHost(), "0.0.0.0", 8) == 0) {
 243       mHaveServer = false;
 244       SG_LOG(SG_NETWORK, SG_ALERT,
 245         "FGMultiplayMgr - could not resolve '"
 246         << txAddress << "', Multiplayermode disabled");
 247     } else {
 248       mHaveServer = true;
 249     }
 250     if (rxPort <= 0)
 251       rxPort = txPort;
 252   }
 253   if (rxPort <= 0) {
 254     SG_LOG(SG_NETWORK, SG_ALERT,
 255       "FGMultiplayMgr - No receiver port, Multiplayermode disabled");
 256     return (false);
 257   }
 258   if (mCallsign.empty())
 259     mCallsign = "JohnDoe"; // FIXME: use getpwuid
 260   SG_LOG(SG_NETWORK,SG_INFO,"FGMultiplayMgr::init-txaddress= "<<txAddress);
 261   SG_LOG(SG_NETWORK,SG_INFO,"FGMultiplayMgr::init-txport= "<<txPort );
 262   SG_LOG(SG_NETWORK,SG_INFO,"FGMultiplayMgr::init-rxaddress="<<rxAddress );
 263   SG_LOG(SG_NETWORK,SG_INFO,"FGMultiplayMgr::init-rxport= "<<rxPort);
 264   SG_LOG(SG_NETWORK,SG_INFO,"FGMultiplayMgr::init-callsign= "<<mCallsign);
 265   Close(); // Should Init be called twice, close Socket first
 266            // A memory leak was reported here by valgrind
 267   mSocket = new netSocket();
 268   if (!mSocket->open(false)) {
 269     SG_LOG( SG_NETWORK, SG_ALERT,
 270             "FGMultiplayMgr::init - Failed to create data socket" );
 271     return false;
 272   }
 273   mSocket->setBlocking(false);
 274   if (mSocket->bind(rxAddress.c_str(), rxPort) != 0) {
 275     perror("bind");
 276     SG_LOG( SG_NETWORK, SG_ALERT,
 277             "FGMultiplayMgr::Open - Failed to bind receive socket" );
 278     return false;
 279   }
 280   mInitialised = true;
 281   return true;
 282 } // FGMultiplayMgr::init()
 283 //////////////////////////////////////////////////////////////////////
 284
 285 //////////////////////////////////////////////////////////////////////
 286 //
 287 //  Closes and deletes the local player object. Closes
 288 //  and deletes the tx socket. Resets the object state to unitialised.
 289 //
 290 //////////////////////////////////////////////////////////////////////
 291 void
 292 FGMultiplayMgr::Close (void)
 293 {
 294   mMultiPlayerMap.clear();
 295
 296   if (mSocket) {
 297     mSocket->close();
 298     delete mSocket;
 299     mSocket = 0;
 300   }
 301   mInitialised = false;
 302 } // FGMultiplayMgr::Close(void)
 303 //////////////////////////////////////////////////////////////////////
 304
 305 //////////////////////////////////////////////////////////////////////
 306 //
 307 //  Description: Sends the position data for the local position.
 308 //
 309 //////////////////////////////////////////////////////////////////////
 310 void
 311 FGMultiplayMgr::SendMyPosition(const FGExternalMotionData& motionInfo)
 312 {
 313   if ((! mInitialised) || (! mHaveServer))
 314         return;
 315   if (! mHaveServer) {
 316     SG_LOG( SG_NETWORK, SG_ALERT, "FGMultiplayMgr::SendMyPosition - no server");
 317     return;
 318   }
 319
 320   T_PositionMsg PosMsg;
 321   strncpy(PosMsg.Model, fgGetString("/sim/model/path"), MAX_MODEL_NAME_LEN);
 322   PosMsg.Model[MAX_MODEL_NAME_LEN - 1] = '\0';
 323
 324   PosMsg.time = XDR_encode_double (motionInfo.time);
 325   PosMsg.lag = XDR_encode_double (motionInfo.lag);
 326   for (unsigned i = 0 ; i < 3; ++i)
 327     PosMsg.position[i] = XDR_encode_double (motionInfo.position(i));
 328   SGVec3f angleAxis;
 329   motionInfo.orientation.getAngleAxis(angleAxis);
 330   for (unsigned i = 0 ; i < 3; ++i)
 331     PosMsg.orientation[i] = XDR_encode_float (angleAxis(i));
 332   for (unsigned i = 0 ; i < 3; ++i)
 333     PosMsg.linearVel[i] = XDR_encode_float (motionInfo.linearVel(i));
 334   for (unsigned i = 0 ; i < 3; ++i)
 335     PosMsg.angularVel[i] = XDR_encode_float (motionInfo.angularVel(i));
 336   for (unsigned i = 0 ; i < 3; ++i)
 337     PosMsg.linearAccel[i] = XDR_encode_float (motionInfo.linearAccel(i));
 338   for (unsigned i = 0 ; i < 3; ++i)
 339     PosMsg.angularAccel[i] = XDR_encode_float (motionInfo.angularAccel(i));
 340
 341   char Msg[MAX_PACKET_SIZE];
 342   memcpy(Msg + sizeof(T_MsgHdr), &PosMsg, sizeof(T_PositionMsg));
 343
 344   char* ptr = Msg + sizeof(T_MsgHdr) + sizeof(T_PositionMsg);
 345   std::vector<FGPropertyData*>::const_iterator it;
 346   it = motionInfo.properties.begin();
 347   //cout << "OUTPUT PROPERTIES\n";
 348   while (it != motionInfo.properties.end()
 349          && ptr + 2 * sizeof(xdr_data_t) < (Msg + MAX_PACKET_SIZE)) {
 350
 351     // First elements is the ID
 352     xdr_data_t xdr = XDR_encode_uint32((*it)->id);
 353     memcpy(ptr, &xdr, sizeof(xdr_data_t));
 354     ptr += sizeof(xdr_data_t);
 355
 356     // The actual data representation depends on the type
 357     switch ((*it)->type) {
 358       case SGPropertyNode::INT:
 359       case SGPropertyNode::BOOL:
 360       case SGPropertyNode::LONG:
 361         xdr = XDR_encode_uint32((*it)->int_value);
 362         memcpy(ptr, &xdr, sizeof(xdr_data_t));
 363         ptr += sizeof(xdr_data_t);
 364         //cout << "Prop:" << (*it)->id << " " << (*it)->type << " "<< (*it)->int_value << "\n";
 365         break;
 366       case SGPropertyNode::FLOAT:
 367       case SGPropertyNode::DOUBLE:
 368         xdr = XDR_encode_float((*it)->float_value);;
 369         memcpy(ptr, &xdr, sizeof(xdr_data_t));
 370         ptr += sizeof(xdr_data_t);
 371         //cout << "Prop:" << (*it)->id << " " << (*it)->type << " "<< (*it)->float_value << "\n";
 372         break;
 373       case SGPropertyNode::STRING:
 374       case SGPropertyNode::UNSPECIFIED:
 375         {
 376           // String is complicated. It consists of
 377           // The length of the string
 378           // The string itself
 379           // Padding to the nearest 4-bytes.
 380           const char* lcharptr = (*it)->string_value;
 381
 382           if (lcharptr != 0)
 383           {
 384             // Add the length
 385             ////cout << "String length: " << strlen(lcharptr) << "\n";
 386             uint32_t len = strlen(lcharptr);
 387             // XXX This should not be using 4 bytes per character!
 388             if (ptr + (1 + len + (4 - len % 4)) * sizeof (xdr_data_t)
 389                 >= (Msg + MAX_PACKET_SIZE))
 390                 goto escape;
 391             //cout << "String length unint32: " << len << "\n";
 392             xdr = XDR_encode_uint32(len);
 393             memcpy(ptr, &xdr, sizeof(xdr_data_t));
 394             ptr += sizeof(xdr_data_t);
 395
 396             if (len != 0)
 397             {
 398
 399               // Now the text itself
 400               // XXX This should not be using 4 bytes per character!
 401               int lcount = 0;
 402               while ((*lcharptr != '\0') && (lcount < MAX_TEXT_SIZE))
 403               {
 404                 xdr = XDR_encode_int8(*lcharptr);
 405                 memcpy(ptr, &xdr, sizeof(xdr_data_t));
 406                 ptr += sizeof(xdr_data_t);
 407                 lcharptr++;
 408                 lcount++;
 409               }
 410
 411               //cout << "Prop:" << (*it)->id << " " << (*it)->type << " " << len << " " << (*it)->string_value;
 412
 413               // Now pad if required
 414               while ((lcount % 4) != 0)
 415               {
 416                 xdr = XDR_encode_int8(0);
 417                 memcpy(ptr, &xdr, sizeof(xdr_data_t));
 418                 ptr += sizeof(xdr_data_t);
 419                 lcount++;
 420                 //cout << "0";
 421               }
 422
 423               //cout << "\n";
 424             }
 425           }
 426           else
 427           {
 428             // Nothing to encode
 429             xdr = XDR_encode_uint32(0);
 430             memcpy(ptr, &xdr, sizeof(xdr_data_t));
 431             ptr += sizeof(xdr_data_t);
 432             //cout << "Prop:" << (*it)->id << " " << (*it)->type << " 0\n";
 433           }
 434
 435         }
 436         break;
 437
 438       default:
 439         //cout << " Unknown Type: " << (*it)->type << "\n";
 440         xdr = XDR_encode_float((*it)->float_value);;
 441         memcpy(ptr, &xdr, sizeof(xdr_data_t));
 442         ptr += sizeof(xdr_data_t);
 443         //cout << "Prop:" << (*it)->id << " " << (*it)->type << " "<< (*it)->float_value << "\n";
 444         break;
 445     }
 446
 447     ++it;
 448   }
 449 escape:
 450
 451   T_MsgHdr MsgHdr;
 452   FillMsgHdr(&MsgHdr, POS_DATA_ID, ptr - Msg);
 453   memcpy(Msg, &MsgHdr, sizeof(T_MsgHdr));
 454
 455   mSocket->sendto(Msg, ptr - Msg, 0, &mServer);
 456   SG_LOG(SG_NETWORK, SG_DEBUG, "FGMultiplayMgr::SendMyPosition");
 457 } // FGMultiplayMgr::SendMyPosition()
 458 //////////////////////////////////////////////////////////////////////
 459
 460 //////////////////////////////////////////////////////////////////////
 461 //
 462 //  Name: SendTextMessage
 463 //  Description: Sends a message to the player. The message must
 464 //  contain a valid and correctly filled out header and optional
 465 //  message body.
 466 //
 467 //////////////////////////////////////////////////////////////////////
 468 void
 469 FGMultiplayMgr::SendTextMessage(const string &MsgText)
 470 {
 471   if (!mInitialised || !mHaveServer)
 472     return;
 473
 474   T_MsgHdr MsgHdr;
 475   FillMsgHdr(&MsgHdr, CHAT_MSG_ID);
 476   //////////////////////////////////////////////////
 477   // Divide the text string into blocks that fit
 478   // in the message and send the blocks.
 479   //////////////////////////////////////////////////
 480   unsigned iNextBlockPosition = 0;
 481   T_ChatMsg ChatMsg;
 482
 483   char Msg[sizeof(T_MsgHdr) + sizeof(T_ChatMsg)];
 484   while (iNextBlockPosition < MsgText.length()) {
 485     strncpy (ChatMsg.Text,
 486              MsgText.substr(iNextBlockPosition, MAX_CHAT_MSG_LEN - 1).c_str(),
 487              MAX_CHAT_MSG_LEN);
 488     ChatMsg.Text[MAX_CHAT_MSG_LEN - 1] = '\0';
 489     memcpy (Msg, &MsgHdr, sizeof(T_MsgHdr));
 490     memcpy (Msg + sizeof(T_MsgHdr), &ChatMsg, sizeof(T_ChatMsg));
 491     mSocket->sendto (Msg, sizeof(T_MsgHdr) + sizeof(T_ChatMsg), 0, &mServer);
 492     iNextBlockPosition += MAX_CHAT_MSG_LEN - 1;
 493
 494   }
 495
 496
 497 } // FGMultiplayMgr::SendTextMessage ()
 498 //////////////////////////////////////////////////////////////////////
 499
 500 //////////////////////////////////////////////////////////////////////
 501 //
 502 //  Name: ProcessData
 503 //  Description: Processes data waiting at the receive socket. The
 504 //  processing ends when there is no more data at the socket.
 505 //
 506 //////////////////////////////////////////////////////////////////////
 507 void
 508 FGMultiplayMgr::Update(void)
 509 {
 510   if (!mInitialised)
 511     return;
 512
 513   /// Just for expiry
 514   SGTimeStamp timestamper;
 515   timestamper.stamp();
 516   long stamp = timestamper.get_seconds();
 517
 518   //////////////////////////////////////////////////
 519   //  Read the receive socket and process any data
 520   //////////////////////////////////////////////////
 521   int bytes;
 522   do {
 523     char Msg[MAX_PACKET_SIZE];
 524     //////////////////////////////////////////////////
 525     //  Although the recv call asks for
 526     //  MAX_PACKET_SIZE of data, the number of bytes
 527     //  returned will only be that of the next
 528     //  packet waiting to be processed.
 529     //////////////////////////////////////////////////
 530     netAddress SenderAddress;
 531     bytes = mSocket->recvfrom(Msg, sizeof(Msg), 0, &SenderAddress);
 532     //////////////////////////////////////////////////
 533     //  no Data received
 534     //////////////////////////////////////////////////
 535     if (bytes <= 0) {
 536       if (errno != EAGAIN && errno != 0) // MSVC output "NoError" otherwise
 537         perror("FGMultiplayMgr::MP_ProcessData");
 538       break;
 539     }
 540     if (bytes <= sizeof(T_MsgHdr)) {
 541       SG_LOG( SG_NETWORK, SG_ALERT, "FGMultiplayMgr::MP_ProcessData - "
 542               << "received message with insufficient data" );
 543       break;
 544     }
 545     //////////////////////////////////////////////////
 546     //  Read header
 547     //////////////////////////////////////////////////
 548     T_MsgHdr* MsgHdr = (T_MsgHdr *)Msg;
 549     MsgHdr->Magic       = XDR_decode_uint32 (MsgHdr->Magic);
 550     MsgHdr->Version     = XDR_decode_uint32 (MsgHdr->Version);
 551     MsgHdr->MsgId       = XDR_decode_uint32 (MsgHdr->MsgId);
 552     MsgHdr->MsgLen      = XDR_decode_uint32 (MsgHdr->MsgLen);
 553     MsgHdr->ReplyPort   = XDR_decode_uint32 (MsgHdr->ReplyPort);
 554     if (MsgHdr->Magic != MSG_MAGIC) {
 555       SG_LOG( SG_NETWORK, SG_ALERT, "FGMultiplayMgr::MP_ProcessData - "
 556               << "message has invalid magic number!" );
 557       break;
 558     }
 559     if (MsgHdr->Version != PROTO_VER) {
 560       SG_LOG( SG_NETWORK, SG_ALERT, "FGMultiplayMgr::MP_ProcessData - "
 561               << "message has invalid protocoll number!" );
 562       break;
 563     }
 564     if (MsgHdr->MsgLen != bytes) {
 565       SG_LOG( SG_NETWORK, SG_ALERT, "FGMultiplayMgr::MP_ProcessData - "
 566               << "message has invalid length!" );
 567       break;
 568     }
 569     //////////////////////////////////////////////////
 570     //  Process messages
 571     //////////////////////////////////////////////////
 572     switch (MsgHdr->MsgId) {
 573     case CHAT_MSG_ID:
 574       ProcessChatMsg(Msg, SenderAddress);
 575       break;
 576     case POS_DATA_ID:
 577       ProcessPosMsg(Msg, SenderAddress, bytes, stamp);
 578       break;
 579     case UNUSABLE_POS_DATA_ID:
 580     case OLD_OLD_POS_DATA_ID:
 581     case OLD_PROP_MSG_ID:
 582     case OLD_POS_DATA_ID:
 583       break;
 584     default:
 585       SG_LOG( SG_NETWORK, SG_ALERT, "FGMultiplayMgr::MP_ProcessData - "
 586               << "Unknown message Id received: " << MsgHdr->MsgId );
 587       break;
 588     }
 589   } while (bytes > 0);
 590
 591   // check for expiry
 592   MultiPlayerMap::iterator it = mMultiPlayerMap.begin();
 593   while (it != mMultiPlayerMap.end()) {
 594     if (it->second->getLastTimestamp() + 10 < stamp) {
 595       std::string name = it->first;
 596       it->second->setDie(true);
 597       mMultiPlayerMap.erase(it);
 598       it = mMultiPlayerMap.upper_bound(name);
 599     } else
 600       ++it;
 601   }
 602 } // FGMultiplayMgr::ProcessData(void)
 603 //////////////////////////////////////////////////////////////////////
 604
 605 //////////////////////////////////////////////////////////////////////
 606 //
 607 //  handle a position message
 608 //
 609 //////////////////////////////////////////////////////////////////////
 610 void
 611 FGMultiplayMgr::ProcessPosMsg(const char *Msg, netAddress & SenderAddress,
 612                               unsigned len, long stamp)
 613 {
 614   T_MsgHdr* MsgHdr = (T_MsgHdr *)Msg;
 615   if (MsgHdr->MsgLen < sizeof(T_MsgHdr) + sizeof(T_PositionMsg)) {
 616     SG_LOG( SG_NETWORK, SG_ALERT, "FGMultiplayMgr::MP_ProcessData - "
 617             << "Position message received with insufficient data" );
 618     return;
 619   }
 620   T_PositionMsg* PosMsg = (T_PositionMsg *)(Msg + sizeof(T_MsgHdr));
 621   FGExternalMotionData motionInfo;
 622   motionInfo.time = XDR_decode_double(PosMsg->time);
 623   motionInfo.lag = XDR_decode_double(PosMsg->lag);
 624   for (unsigned i = 0; i < 3; ++i)
 625     motionInfo.position(i) = XDR_decode_double(PosMsg->position[i]);
 626   SGVec3f angleAxis;
 627   for (unsigned i = 0; i < 3; ++i)
 628     angleAxis(i) = XDR_decode_float(PosMsg->orientation[i]);
 629   motionInfo.orientation = SGQuatf::fromAngleAxis(angleAxis);
 630   for (unsigned i = 0; i < 3; ++i)
 631     motionInfo.linearVel(i) = XDR_decode_float(PosMsg->linearVel[i]);
 632   for (unsigned i = 0; i < 3; ++i)
 633     motionInfo.angularVel(i) = XDR_decode_float(PosMsg->angularVel[i]);
 634   for (unsigned i = 0; i < 3; ++i)
 635     motionInfo.linearAccel(i) = XDR_decode_float(PosMsg->linearAccel[i]);
 636   for (unsigned i = 0; i < 3; ++i)
 637     motionInfo.angularAccel(i) = XDR_decode_float(PosMsg->angularAccel[i]);
 638
 639
 640   //cout << "INPUT MESSAGE\n";
 641   xdr_data_t* xdr = (xdr_data_t*)
 642                    (Msg + sizeof(T_MsgHdr) + sizeof(T_PositionMsg));
 643   while ((char*)xdr < Msg + len) {
 644     FGPropertyData* pData = new FGPropertyData;
 645     SGPropertyNode::Type type = SGPropertyNode::UNSPECIFIED;
 646
 647     // First element is always the ID
 648     pData->id = XDR_decode_uint32(*xdr);
 649     //cout << pData->id << " ";
 650     xdr++;
 651
 652     // Check the ID actually exists and get the type
 653     unsigned i = 0;
 654     bool found = false;
 655     while (FGMultiplayMgr::sIdPropertyList[i].name)
 656     {
 657       if (sIdPropertyList[i].id == pData->id)
 658       {
 659         found = true;
 660         pData->type = sIdPropertyList[i].type;
 661       }
 662
 663       i++;
 664     }
 665
 666     if (found == true)
 667     {
 668       // How we decode the remainder of the property depends on the type
 669       switch (pData->type) {
 670         case SGPropertyNode::INT:
 671         case SGPropertyNode::BOOL:
 672         case SGPropertyNode::LONG:
 673           pData->int_value = XDR_decode_uint32(*xdr);
 674           xdr++;
 675           //cout << pData->int_value << "\n";
 676           break;
 677         case SGPropertyNode::FLOAT:
 678         case SGPropertyNode::DOUBLE:
 679           pData->float_value = XDR_decode_float(*xdr);
 680           xdr++;
 681           //cout << pData->float_value << "\n";
 682           break;
 683         case SGPropertyNode::STRING:
 684         case SGPropertyNode::UNSPECIFIED:
 685           {
 686             // String is complicated. It consists of
 687             // The length of the string
 688             // The string itself
 689             // Padding to the nearest 4-bytes.
 690             uint32_t length = XDR_decode_uint32(*xdr);
 691             xdr++;
 692             //cout << length << " ";
 693
 694             if ((length > 0) && (length < MAX_TEXT_SIZE))
 695             {
 696               pData->string_value = new char[length + 1];
 697               //cout << " String: ";
 698
 699               for (int i = 0; i < length; i++)
 700               {
 701                 pData->string_value[i] = (char) XDR_decode_int8(*xdr);
 702                 xdr++;
 703                 //cout << pData->string_value[i];
 704               }
 705
 706               pData->string_value[length] = '\0';
 707
 708               // Now handle the padding
 709               while ((length % 4) != 0)
 710               {
 711                 xdr++;
 712                 length++;
 713                 //cout << "0";
 714               }
 715             }
 716             else
 717             {
 718               pData->string_value = new char[1];
 719               pData->string_value[0] = '\0';
 720             }
 721
 722             //cout << "\n";
 723           }
 724           break;
 725
 726         default:
 727           pData->float_value = XDR_decode_float(*xdr);
 728           cerr << "Unknown Prop type " << pData->id << " " << pData->type << "\n";
 729           xdr++;
 730           break;
 731       }
 732
 733       motionInfo.properties.push_back(pData);
 734     }
 735     else
 736     {
 737       // We failed to find the property. We'll try the next packet immediately.
 738       //cout << " Unknown\n";
 739     }
 740   }
 741
 742   FGAIMultiplayer* mp = getMultiplayer(MsgHdr->Callsign);
 743   if (!mp)
 744     mp = addMultiplayer(MsgHdr->Callsign, PosMsg->Model);
 745   mp->addMotionInfo(motionInfo, stamp);
 746 } // FGMultiplayMgr::ProcessPosMsg()
 747 //////////////////////////////////////////////////////////////////////
 748
 749 //////////////////////////////////////////////////////////////////////
 750 //
 751 //  handle a chat message
 752 //  FIXME: display chat message withi flightgear
 753 //
 754 //////////////////////////////////////////////////////////////////////
 755 void
 756 FGMultiplayMgr::ProcessChatMsg(const char *Msg, netAddress& SenderAddress)
 757 {
 758   T_MsgHdr* MsgHdr = (T_MsgHdr *)Msg;
 759   if (MsgHdr->MsgLen < sizeof(T_MsgHdr) + 1) {
 760     SG_LOG( SG_NETWORK, SG_ALERT, "FGMultiplayMgr::MP_ProcessData - "
 761             << "Chat message received with insufficient data" );
 762     return;
 763   }
 764
 765   char *MsgBuf = new char[MsgHdr->MsgLen - sizeof(T_MsgHdr)];
 766   strncpy(MsgBuf, ((T_ChatMsg *)(Msg + sizeof(T_MsgHdr)))->Text,
 767           MsgHdr->MsgLen - sizeof(T_MsgHdr));
 768   MsgBuf[MsgHdr->MsgLen - sizeof(T_MsgHdr) - 1] = '\0';
 769
 770   T_ChatMsg* ChatMsg = (T_ChatMsg *)(Msg + sizeof(T_MsgHdr));
 771   SG_LOG (SG_NETWORK, SG_ALERT, "Chat [" << MsgHdr->Callsign << "]"
 772            << " " << MsgBuf);
 773
 774   delete [] MsgBuf;
 775 } // FGMultiplayMgr::ProcessChatMsg ()
 776 //////////////////////////////////////////////////////////////////////
 777
 778 void
 779 FGMultiplayMgr::FillMsgHdr(T_MsgHdr *MsgHdr, int MsgId, unsigned _len)
 780 {
 781   uint32_t len;
 782   switch (MsgId) {
 783   case CHAT_MSG_ID:
 784     len = sizeof(T_MsgHdr) + sizeof(T_ChatMsg);
 785     break;
 786   case POS_DATA_ID:
 787     len = _len;
 788     break;
 789   default:
 790     len = sizeof(T_MsgHdr);
 791     break;
 792   }
 793   MsgHdr->Magic           = XDR_encode_uint32(MSG_MAGIC);
 794   MsgHdr->Version         = XDR_encode_uint32(PROTO_VER);
 795   MsgHdr->MsgId           = XDR_encode_uint32(MsgId);
 796   MsgHdr->MsgLen          = XDR_encode_uint32(len);
 797   MsgHdr->ReplyAddress    = 0; // Are obsolete, keep them for the server for
 798   MsgHdr->ReplyPort       = 0; // now
 799   strncpy(MsgHdr->Callsign, mCallsign.c_str(), MAX_CALLSIGN_LEN);
 800   MsgHdr->Callsign[MAX_CALLSIGN_LEN - 1] = '\0';
 801 }
 802
 803 FGAIMultiplayer*
 804 FGMultiplayMgr::addMultiplayer(const std::string& callsign,
 805                                const std::string& modelName)
 806 {
 807   if (0 < mMultiPlayerMap.count(callsign))
 808     return mMultiPlayerMap[callsign].get();
 809
 810   FGAIMultiplayer* mp = new FGAIMultiplayer;
 811   mp->setPath(modelName.c_str());
 812   mp->setCallSign(callsign);
 813   mMultiPlayerMap[callsign] = mp;
 814
 815   FGAIManager *aiMgr = (FGAIManager*)globals->get_subsystem("ai_model");
 816   if (aiMgr) {
 817     aiMgr->attach(mp);
 818
 819     /// FIXME: that must follow the attach ATM ...
 820     unsigned i = 0;
 821     while (sIdPropertyList[i].name) {
 822       mp->addPropertyId(sIdPropertyList[i].id, sIdPropertyList[i].name);
 823       ++i;
 824     }
 825   }
 826
 827   return mp;
 828 }
 829
 830 FGAIMultiplayer*
 831 FGMultiplayMgr::getMultiplayer(const std::string& callsign)
 832 {
 833   if (0 < mMultiPlayerMap.count(callsign))
 834     return mMultiPlayerMap[callsign].get();
 835   else
 836     return 0;
 837 }