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     rxPort = txPort;
 251   }
 252   if (rxPort <= 0) {
 253     SG_LOG(SG_NETWORK, SG_ALERT,
 254       "FGMultiplayMgr - No receiver port, Multiplayermode disabled");
 255     return (false);
 256   }
 257   if (mCallsign.empty())
 258     mCallsign = "JohnDoe"; // FIXME: use getpwuid
 259   SG_LOG(SG_NETWORK,SG_INFO,"FGMultiplayMgr::init-txaddress= "<<txAddress);
 260   SG_LOG(SG_NETWORK,SG_INFO,"FGMultiplayMgr::init-txport= "<<txPort );
 261   SG_LOG(SG_NETWORK,SG_INFO,"FGMultiplayMgr::init-rxaddress="<<rxAddress );
 262   SG_LOG(SG_NETWORK,SG_INFO,"FGMultiplayMgr::init-rxport= "<<rxPort);
 263   SG_LOG(SG_NETWORK,SG_INFO,"FGMultiplayMgr::init-callsign= "<<mCallsign);
 264   Close(); // Should Init be called twice, close Socket first
 265            // A memory leak was reported here by valgrind
 266   mSocket = new netSocket();
 267   if (!mSocket->open(false)) {
 268     SG_LOG( SG_NETWORK, SG_ALERT,
 269             "FGMultiplayMgr::init - Failed to create data socket" );
 270     return false;
 271   }
 272   mSocket->setBlocking(false);
 273   if (mSocket->bind(rxAddress.c_str(), rxPort) != 0) {
 274     perror("bind");
 275     SG_LOG( SG_NETWORK, SG_ALERT,
 276             "FGMultiplayMgr::Open - Failed to bind receive socket" );
 277     return false;
 278   }
 279   mInitialised = true;
 280   return true;
 281 } // FGMultiplayMgr::init()
 282 //////////////////////////////////////////////////////////////////////
 283
 284 //////////////////////////////////////////////////////////////////////
 285 //
 286 //  Closes and deletes the local player object. Closes
 287 //  and deletes the tx socket. Resets the object state to unitialised.
 288 //
 289 //////////////////////////////////////////////////////////////////////
 290 void
 291 FGMultiplayMgr::Close (void)
 292 {
 293   mMultiPlayerMap.clear();
 294
 295   if (mSocket) {
 296     mSocket->close();
 297     delete mSocket;
 298     mSocket = 0;
 299   }
 300   mInitialised = false;
 301 } // FGMultiplayMgr::Close(void)
 302 //////////////////////////////////////////////////////////////////////
 303
 304 //////////////////////////////////////////////////////////////////////
 305 //
 306 //  Description: Sends the position data for the local position.
 307 //
 308 //////////////////////////////////////////////////////////////////////
 309 void
 310 FGMultiplayMgr::SendMyPosition(const FGExternalMotionData& motionInfo)
 311 {
 312   if ((! mInitialised) || (! mHaveServer))
 313         return;
 314   if (! mHaveServer) {
 315     SG_LOG( SG_NETWORK, SG_ALERT, "FGMultiplayMgr::SendMyPosition - no server");
 316     return;
 317   }
 318
 319   T_PositionMsg PosMsg;
 320   strncpy(PosMsg.Model, fgGetString("/sim/model/path"), MAX_MODEL_NAME_LEN);
 321   PosMsg.Model[MAX_MODEL_NAME_LEN - 1] = '\0';
 322
 323   PosMsg.time = XDR_encode_double (motionInfo.time);
 324   PosMsg.lag = XDR_encode_double (motionInfo.lag);
 325   for (unsigned i = 0 ; i < 3; ++i)
 326     PosMsg.position[i] = XDR_encode_double (motionInfo.position(i));
 327   SGVec3f angleAxis;
 328   motionInfo.orientation.getAngleAxis(angleAxis);
 329   for (unsigned i = 0 ; i < 3; ++i)
 330     PosMsg.orientation[i] = XDR_encode_float (angleAxis(i));
 331   for (unsigned i = 0 ; i < 3; ++i)
 332     PosMsg.linearVel[i] = XDR_encode_float (motionInfo.linearVel(i));
 333   for (unsigned i = 0 ; i < 3; ++i)
 334     PosMsg.angularVel[i] = XDR_encode_float (motionInfo.angularVel(i));
 335   for (unsigned i = 0 ; i < 3; ++i)
 336     PosMsg.linearAccel[i] = XDR_encode_float (motionInfo.linearAccel(i));
 337   for (unsigned i = 0 ; i < 3; ++i)
 338     PosMsg.angularAccel[i] = XDR_encode_float (motionInfo.angularAccel(i));
 339
 340   char Msg[MAX_PACKET_SIZE];
 341   memcpy(Msg + sizeof(T_MsgHdr), &PosMsg, sizeof(T_PositionMsg));
 342
 343   char* ptr = Msg + sizeof(T_MsgHdr) + sizeof(T_PositionMsg);
 344   std::vector<FGPropertyData*>::const_iterator it;
 345   it = motionInfo.properties.begin();
 346   //cout << "OUTPUT PROPERTIES\n";
 347   while (it != motionInfo.properties.end()
 348          && ptr + 2 * sizeof(xdr_data_t) < (Msg + MAX_PACKET_SIZE)) {
 349
 350     // First elements is the ID
 351     xdr_data_t xdr = XDR_encode_uint32((*it)->id);
 352     memcpy(ptr, &xdr, sizeof(xdr_data_t));
 353     ptr += sizeof(xdr_data_t);
 354
 355     // The actual data representation depends on the type
 356     switch ((*it)->type) {
 357       case SGPropertyNode::INT:
 358       case SGPropertyNode::BOOL:
 359       case SGPropertyNode::LONG:
 360         xdr = XDR_encode_uint32((*it)->int_value);
 361         memcpy(ptr, &xdr, sizeof(xdr_data_t));
 362         ptr += sizeof(xdr_data_t);
 363         //cout << "Prop:" << (*it)->id << " " << (*it)->type << " "<< (*it)->int_value << "\n";
 364         break;
 365       case SGPropertyNode::FLOAT:
 366       case SGPropertyNode::DOUBLE:
 367         xdr = XDR_encode_float((*it)->float_value);;
 368         memcpy(ptr, &xdr, sizeof(xdr_data_t));
 369         ptr += sizeof(xdr_data_t);
 370         //cout << "Prop:" << (*it)->id << " " << (*it)->type << " "<< (*it)->float_value << "\n";
 371         break;
 372       case SGPropertyNode::STRING:
 373       case SGPropertyNode::UNSPECIFIED:
 374         {
 375           // String is complicated. It consists of
 376           // The length of the string
 377           // The string itself
 378           // Padding to the nearest 4-bytes.
 379           const char* lcharptr = (*it)->string_value;
 380
 381           if (lcharptr != 0)
 382           {
 383             // Add the length
 384             ////cout << "String length: " << strlen(lcharptr) << "\n";
 385             uint32_t len = strlen(lcharptr);
 386             // XXX This should not be using 4 bytes per character!
 387             if (ptr + (1 + len + (4 - len % 4)) * sizeof (xdr_data_t)
 388                 >= (Msg + MAX_PACKET_SIZE))
 389                 goto escape;
 390             //cout << "String length unint32: " << len << "\n";
 391             xdr = XDR_encode_uint32(len);
 392             memcpy(ptr, &xdr, sizeof(xdr_data_t));
 393             ptr += sizeof(xdr_data_t);
 394
 395             if (len != 0)
 396             {
 397
 398               // Now the text itself
 399               // XXX This should not be using 4 bytes per character!
 400               int lcount = 0;
 401               while ((*lcharptr != '\0') && (lcount < MAX_TEXT_SIZE))
 402               {
 403                 xdr = XDR_encode_int8(*lcharptr);
 404                 memcpy(ptr, &xdr, sizeof(xdr_data_t));
 405                 ptr += sizeof(xdr_data_t);
 406                 lcharptr++;
 407                 lcount++;
 408               }
 409
 410               //cout << "Prop:" << (*it)->id << " " << (*it)->type << " " << len << " " << (*it)->string_value;
 411
 412               // Now pad if required
 413               while ((lcount % 4) != 0)
 414               {
 415                 xdr = XDR_encode_int8(0);
 416                 memcpy(ptr, &xdr, sizeof(xdr_data_t));
 417                 ptr += sizeof(xdr_data_t);
 418                 lcount++;
 419                 //cout << "0";
 420               }
 421
 422               //cout << "\n";
 423             }
 424           }
 425           else
 426           {
 427             // Nothing to encode
 428             xdr = XDR_encode_uint32(0);
 429             memcpy(ptr, &xdr, sizeof(xdr_data_t));
 430             ptr += sizeof(xdr_data_t);
 431             //cout << "Prop:" << (*it)->id << " " << (*it)->type << " 0\n";
 432           }
 433
 434         }
 435         break;
 436
 437       default:
 438         //cout << " Unknown Type: " << (*it)->type << "\n";
 439         xdr = XDR_encode_float((*it)->float_value);;
 440         memcpy(ptr, &xdr, sizeof(xdr_data_t));
 441         ptr += sizeof(xdr_data_t);
 442         //cout << "Prop:" << (*it)->id << " " << (*it)->type << " "<< (*it)->float_value << "\n";
 443         break;
 444     }
 445
 446     ++it;
 447   }
 448 escape:
 449
 450   T_MsgHdr MsgHdr;
 451   FillMsgHdr(&MsgHdr, POS_DATA_ID, ptr - Msg);
 452   memcpy(Msg, &MsgHdr, sizeof(T_MsgHdr));
 453
 454   mSocket->sendto(Msg, ptr - Msg, 0, &mServer);
 455   SG_LOG(SG_NETWORK, SG_DEBUG, "FGMultiplayMgr::SendMyPosition");
 456 } // FGMultiplayMgr::SendMyPosition()
 457 //////////////////////////////////////////////////////////////////////
 458
 459 //////////////////////////////////////////////////////////////////////
 460 //
 461 //  Name: SendTextMessage
 462 //  Description: Sends a message to the player. The message must
 463 //  contain a valid and correctly filled out header and optional
 464 //  message body.
 465 //
 466 //////////////////////////////////////////////////////////////////////
 467 void
 468 FGMultiplayMgr::SendTextMessage(const string &MsgText)
 469 {
 470   if (!mInitialised || !mHaveServer)
 471     return;
 472
 473   T_MsgHdr MsgHdr;
 474   FillMsgHdr(&MsgHdr, CHAT_MSG_ID);
 475   //////////////////////////////////////////////////
 476   // Divide the text string into blocks that fit
 477   // in the message and send the blocks.
 478   //////////////////////////////////////////////////
 479   unsigned iNextBlockPosition = 0;
 480   T_ChatMsg ChatMsg;
 481
 482   char Msg[sizeof(T_MsgHdr) + sizeof(T_ChatMsg)];
 483   while (iNextBlockPosition < MsgText.length()) {
 484     strncpy (ChatMsg.Text,
 485              MsgText.substr(iNextBlockPosition, MAX_CHAT_MSG_LEN - 1).c_str(),
 486              MAX_CHAT_MSG_LEN);
 487     ChatMsg.Text[MAX_CHAT_MSG_LEN - 1] = '\0';
 488     memcpy (Msg, &MsgHdr, sizeof(T_MsgHdr));
 489     memcpy (Msg + sizeof(T_MsgHdr), &ChatMsg, sizeof(T_ChatMsg));
 490     mSocket->sendto (Msg, sizeof(T_MsgHdr) + sizeof(T_ChatMsg), 0, &mServer);
 491     iNextBlockPosition += MAX_CHAT_MSG_LEN - 1;
 492
 493   }
 494
 495
 496 } // FGMultiplayMgr::SendTextMessage ()
 497 //////////////////////////////////////////////////////////////////////
 498
 499 //////////////////////////////////////////////////////////////////////
 500 //
 501 //  Name: ProcessData
 502 //  Description: Processes data waiting at the receive socket. The
 503 //  processing ends when there is no more data at the socket.
 504 //
 505 //////////////////////////////////////////////////////////////////////
 506 void
 507 FGMultiplayMgr::Update(void)
 508 {
 509   if (!mInitialised)
 510     return;
 511
 512   /// Just for expiry
 513   SGTimeStamp timestamper;
 514   timestamper.stamp();
 515   long stamp = timestamper.get_seconds();
 516
 517   //////////////////////////////////////////////////
 518   //  Read the receive socket and process any data
 519   //////////////////////////////////////////////////
 520   int bytes;
 521   do {
 522     char Msg[MAX_PACKET_SIZE];
 523     //////////////////////////////////////////////////
 524     //  Although the recv call asks for
 525     //  MAX_PACKET_SIZE of data, the number of bytes
 526     //  returned will only be that of the next
 527     //  packet waiting to be processed.
 528     //////////////////////////////////////////////////
 529     netAddress SenderAddress;
 530     bytes = mSocket->recvfrom(Msg, sizeof(Msg), 0, &SenderAddress);
 531     //////////////////////////////////////////////////
 532     //  no Data received
 533     //////////////////////////////////////////////////
 534     if (bytes <= 0) {
 535       if (errno != EAGAIN && errno != 0) // MSVC output "NoError" otherwise
 536         perror("FGMultiplayMgr::MP_ProcessData");
 537       break;
 538     }
 539     if (bytes <= sizeof(T_MsgHdr)) {
 540       SG_LOG( SG_NETWORK, SG_ALERT, "FGMultiplayMgr::MP_ProcessData - "
 541               << "received message with insufficient data" );
 542       break;
 543     }
 544     //////////////////////////////////////////////////
 545     //  Read header
 546     //////////////////////////////////////////////////
 547     T_MsgHdr* MsgHdr = (T_MsgHdr *)Msg;
 548     MsgHdr->Magic       = XDR_decode_uint32 (MsgHdr->Magic);
 549     MsgHdr->Version     = XDR_decode_uint32 (MsgHdr->Version);
 550     MsgHdr->MsgId       = XDR_decode_uint32 (MsgHdr->MsgId);
 551     MsgHdr->MsgLen      = XDR_decode_uint32 (MsgHdr->MsgLen);
 552     MsgHdr->ReplyPort   = XDR_decode_uint32 (MsgHdr->ReplyPort);
 553     if (MsgHdr->Magic != MSG_MAGIC) {
 554       SG_LOG( SG_NETWORK, SG_ALERT, "FGMultiplayMgr::MP_ProcessData - "
 555               << "message has invalid magic number!" );
 556       break;
 557     }
 558     if (MsgHdr->Version != PROTO_VER) {
 559       SG_LOG( SG_NETWORK, SG_ALERT, "FGMultiplayMgr::MP_ProcessData - "
 560               << "message has invalid protocoll number!" );
 561       break;
 562     }
 563     if (MsgHdr->MsgLen != bytes) {
 564       SG_LOG( SG_NETWORK, SG_ALERT, "FGMultiplayMgr::MP_ProcessData - "
 565               << "message has invalid length!" );
 566       break;
 567     }
 568     //////////////////////////////////////////////////
 569     //  Process messages
 570     //////////////////////////////////////////////////
 571     switch (MsgHdr->MsgId) {
 572     case CHAT_MSG_ID:
 573       ProcessChatMsg(Msg, SenderAddress);
 574       break;
 575     case POS_DATA_ID:
 576       ProcessPosMsg(Msg, SenderAddress, bytes, stamp);
 577       break;
 578     case UNUSABLE_POS_DATA_ID:
 579     case OLD_OLD_POS_DATA_ID:
 580     case OLD_PROP_MSG_ID:
 581     case OLD_POS_DATA_ID:
 582       break;
 583     default:
 584       SG_LOG( SG_NETWORK, SG_ALERT, "FGMultiplayMgr::MP_ProcessData - "
 585               << "Unknown message Id received: " << MsgHdr->MsgId );
 586       break;
 587     }
 588   } while (bytes > 0);
 589
 590   // check for expiry
 591   MultiPlayerMap::iterator it = mMultiPlayerMap.begin();
 592   while (it != mMultiPlayerMap.end()) {
 593     if (it->second->getLastTimestamp() + 10 < stamp) {
 594       std::string name = it->first;
 595       it->second->setDie(true);
 596       mMultiPlayerMap.erase(it);
 597       it = mMultiPlayerMap.upper_bound(name);
 598     } else
 599       ++it;
 600   }
 601 } // FGMultiplayMgr::ProcessData(void)
 602 //////////////////////////////////////////////////////////////////////
 603
 604 //////////////////////////////////////////////////////////////////////
 605 //
 606 //  handle a position message
 607 //
 608 //////////////////////////////////////////////////////////////////////
 609 void
 610 FGMultiplayMgr::ProcessPosMsg(const char *Msg, netAddress & SenderAddress,
 611                               unsigned len, long stamp)
 612 {
 613   T_MsgHdr* MsgHdr = (T_MsgHdr *)Msg;
 614   if (MsgHdr->MsgLen < sizeof(T_MsgHdr) + sizeof(T_PositionMsg)) {
 615     SG_LOG( SG_NETWORK, SG_ALERT, "FGMultiplayMgr::MP_ProcessData - "
 616             << "Position message received with insufficient data" );
 617     return;
 618   }
 619   T_PositionMsg* PosMsg = (T_PositionMsg *)(Msg + sizeof(T_MsgHdr));
 620   FGExternalMotionData motionInfo;
 621   motionInfo.time = XDR_decode_double(PosMsg->time);
 622   motionInfo.lag = XDR_decode_double(PosMsg->lag);
 623   for (unsigned i = 0; i < 3; ++i)
 624     motionInfo.position(i) = XDR_decode_double(PosMsg->position[i]);
 625   SGVec3f angleAxis;
 626   for (unsigned i = 0; i < 3; ++i)
 627     angleAxis(i) = XDR_decode_float(PosMsg->orientation[i]);
 628   motionInfo.orientation = SGQuatf::fromAngleAxis(angleAxis);
 629   for (unsigned i = 0; i < 3; ++i)
 630     motionInfo.linearVel(i) = XDR_decode_float(PosMsg->linearVel[i]);
 631   for (unsigned i = 0; i < 3; ++i)
 632     motionInfo.angularVel(i) = XDR_decode_float(PosMsg->angularVel[i]);
 633   for (unsigned i = 0; i < 3; ++i)
 634     motionInfo.linearAccel(i) = XDR_decode_float(PosMsg->linearAccel[i]);
 635   for (unsigned i = 0; i < 3; ++i)
 636     motionInfo.angularAccel(i) = XDR_decode_float(PosMsg->angularAccel[i]);
 637
 638
 639   //cout << "INPUT MESSAGE\n";
 640   xdr_data_t* xdr = (xdr_data_t*)
 641                    (Msg + sizeof(T_MsgHdr) + sizeof(T_PositionMsg));
 642   while ((char*)xdr < Msg + len) {
 643     FGPropertyData* pData = new FGPropertyData;
 644     SGPropertyNode::Type type = SGPropertyNode::UNSPECIFIED;
 645
 646     // First element is always the ID
 647     pData->id = XDR_decode_uint32(*xdr);
 648     //cout << pData->id << " ";
 649     xdr++;
 650
 651     // Check the ID actually exists and get the type
 652     unsigned i = 0;
 653     bool found = false;
 654     while (FGMultiplayMgr::sIdPropertyList[i].name)
 655     {
 656       if (sIdPropertyList[i].id == pData->id)
 657       {
 658         found = true;
 659         pData->type = sIdPropertyList[i].type;
 660       }
 661
 662       i++;
 663     }
 664
 665     if (found == true)
 666     {
 667       // How we decode the remainder of the property depends on the type
 668       switch (pData->type) {
 669         case SGPropertyNode::INT:
 670         case SGPropertyNode::BOOL:
 671         case SGPropertyNode::LONG:
 672           pData->int_value = XDR_decode_uint32(*xdr);
 673           xdr++;
 674           //cout << pData->int_value << "\n";
 675           break;
 676         case SGPropertyNode::FLOAT:
 677         case SGPropertyNode::DOUBLE:
 678           pData->float_value = XDR_decode_float(*xdr);
 679           xdr++;
 680           //cout << pData->float_value << "\n";
 681           break;
 682         case SGPropertyNode::STRING:
 683         case SGPropertyNode::UNSPECIFIED:
 684           {
 685             // String is complicated. It consists of
 686             // The length of the string
 687             // The string itself
 688             // Padding to the nearest 4-bytes.
 689             uint32_t length = XDR_decode_uint32(*xdr);
 690             xdr++;
 691             //cout << length << " ";
 692
 693             if ((length > 0) && (length < MAX_TEXT_SIZE))
 694             {
 695               pData->string_value = new char[length + 1];
 696               //cout << " String: ";
 697
 698               for (int i = 0; i < length; i++)
 699               {
 700                 pData->string_value[i] = (char) XDR_decode_int8(*xdr);
 701                 xdr++;
 702                 //cout << pData->string_value[i];
 703               }
 704
 705               pData->string_value[length] = '\0';
 706
 707               // Now handle the padding
 708               while ((length % 4) != 0)
 709               {
 710                 xdr++;
 711                 length++;
 712                 //cout << "0";
 713               }
 714             }
 715             else
 716             {
 717               pData->string_value = new char[1];
 718               pData->string_value[0] = '\0';
 719             }
 720
 721             //cout << "\n";
 722           }
 723           break;
 724
 725         default:
 726           pData->float_value = XDR_decode_float(*xdr);
 727           cerr << "Unknown Prop type " << pData->id << " " << pData->type << "\n";
 728           xdr++;
 729           break;
 730       }
 731
 732       motionInfo.properties.push_back(pData);
 733     }
 734     else
 735     {
 736       // We failed to find the property. We'll try the next packet immediately.
 737       //cout << " Unknown\n";
 738     }
 739   }
 740
 741   FGAIMultiplayer* mp = getMultiplayer(MsgHdr->Callsign);
 742   if (!mp)
 743     mp = addMultiplayer(MsgHdr->Callsign, PosMsg->Model);
 744   mp->addMotionInfo(motionInfo, stamp);
 745 } // FGMultiplayMgr::ProcessPosMsg()
 746 //////////////////////////////////////////////////////////////////////
 747
 748 //////////////////////////////////////////////////////////////////////
 749 //
 750 //  handle a chat message
 751 //  FIXME: display chat message withi flightgear
 752 //
 753 //////////////////////////////////////////////////////////////////////
 754 void
 755 FGMultiplayMgr::ProcessChatMsg(const char *Msg, netAddress& SenderAddress)
 756 {
 757   T_MsgHdr* MsgHdr = (T_MsgHdr *)Msg;
 758   if (MsgHdr->MsgLen < sizeof(T_MsgHdr) + 1) {
 759     SG_LOG( SG_NETWORK, SG_ALERT, "FGMultiplayMgr::MP_ProcessData - "
 760             << "Chat message received with insufficient data" );
 761     return;
 762   }
 763
 764   char *MsgBuf = new char[MsgHdr->MsgLen - sizeof(T_MsgHdr)];
 765   strncpy(MsgBuf, ((T_ChatMsg *)(Msg + sizeof(T_MsgHdr)))->Text,
 766           MsgHdr->MsgLen - sizeof(T_MsgHdr));
 767   MsgBuf[MsgHdr->MsgLen - sizeof(T_MsgHdr) - 1] = '\0';
 768
 769   T_ChatMsg* ChatMsg = (T_ChatMsg *)(Msg + sizeof(T_MsgHdr));
 770   SG_LOG (SG_NETWORK, SG_ALERT, "Chat [" << MsgHdr->Callsign << "]"
 771            << " " << MsgBuf);
 772
 773   delete [] MsgBuf;
 774 } // FGMultiplayMgr::ProcessChatMsg ()
 775 //////////////////////////////////////////////////////////////////////
 776
 777 void
 778 FGMultiplayMgr::FillMsgHdr(T_MsgHdr *MsgHdr, int MsgId, unsigned _len)
 779 {
 780   uint32_t len;
 781   switch (MsgId) {
 782   case CHAT_MSG_ID:
 783     len = sizeof(T_MsgHdr) + sizeof(T_ChatMsg);
 784     break;
 785   case POS_DATA_ID:
 786     len = _len;
 787     break;
 788   default:
 789     len = sizeof(T_MsgHdr);
 790     break;
 791   }
 792   MsgHdr->Magic           = XDR_encode_uint32(MSG_MAGIC);
 793   MsgHdr->Version         = XDR_encode_uint32(PROTO_VER);
 794   MsgHdr->MsgId           = XDR_encode_uint32(MsgId);
 795   MsgHdr->MsgLen          = XDR_encode_uint32(len);
 796   MsgHdr->ReplyAddress    = 0; // Are obsolete, keep them for the server for
 797   MsgHdr->ReplyPort       = 0; // now
 798   strncpy(MsgHdr->Callsign, mCallsign.c_str(), MAX_CALLSIGN_LEN);
 799   MsgHdr->Callsign[MAX_CALLSIGN_LEN - 1] = '\0';
 800 }
 801
 802 FGAIMultiplayer*
 803 FGMultiplayMgr::addMultiplayer(const std::string& callsign,
 804                                const std::string& modelName)
 805 {
 806   if (0 < mMultiPlayerMap.count(callsign))
 807     return mMultiPlayerMap[callsign].get();
 808
 809   FGAIMultiplayer* mp = new FGAIMultiplayer;
 810   mp->setPath(modelName.c_str());
 811   mp->setCallSign(callsign);
 812   mMultiPlayerMap[callsign] = mp;
 813
 814   FGAIManager *aiMgr = (FGAIManager*)globals->get_subsystem("ai_model");
 815   if (aiMgr) {
 816     aiMgr->attach(mp);
 817
 818     /// FIXME: that must follow the attach ATM ...
 819     unsigned i = 0;
 820     while (sIdPropertyList[i].name) {
 821       mp->addPropertyId(sIdPropertyList[i].id, sIdPropertyList[i].name);
 822       ++i;
 823     }
 824   }
 825
 826   return mp;
 827 }
 828
 829 FGAIMultiplayer*
 830 FGMultiplayMgr::getMultiplayer(const std::string& callsign)
 831 {
 832   if (0 < mMultiPlayerMap.count(callsign))
 833     return mMultiPlayerMap[callsign].get();
 834   else
 835     return 0;
 836 }