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
 152   {10001, "sim/multiplay/transmission-freq-hz",  SGPropertyNode::STRING},
 153   {10002, "sim/multiplay/chat",  SGPropertyNode::STRING},
 154
 155   /// termination
 156   {0, 0, SGPropertyNode::UNSPECIFIED}
 157 };
 158
 159 //////////////////////////////////////////////////////////////////////
 160 //
 161 //  MultiplayMgr constructor
 162 //
 163 //////////////////////////////////////////////////////////////////////
 164 FGMultiplayMgr::FGMultiplayMgr()
 165 {
 166   mInitialised   = false;
 167   mHaveServer    = false;
 168 } // FGMultiplayMgr::FGMultiplayMgr()
 169 //////////////////////////////////////////////////////////////////////
 170
 171 //////////////////////////////////////////////////////////////////////
 172 //
 173 //  MultiplayMgr destructor
 174 //
 175 //////////////////////////////////////////////////////////////////////
 176 FGMultiplayMgr::~FGMultiplayMgr()
 177 {
 178   Close();
 179 } // FGMultiplayMgr::~FGMultiplayMgr()
 180 //////////////////////////////////////////////////////////////////////
 181
 182 //////////////////////////////////////////////////////////////////////
 183 //
 184 //  Initialise object
 185 //
 186 //////////////////////////////////////////////////////////////////////
 187 bool
 188 FGMultiplayMgr::init (void)
 189 {
 190   //////////////////////////////////////////////////
 191   //  Initialise object if not already done
 192   //////////////////////////////////////////////////
 193   if (mInitialised) {
 194     SG_LOG(SG_NETWORK, SG_WARN, "FGMultiplayMgr::init - already initialised");
 195     return false;
 196   }
 197   //////////////////////////////////////////////////
 198   //  Set members from property values
 199   //////////////////////////////////////////////////
 200   short rxPort = fgGetInt("/sim/multiplay/rxport");
 201   if (rxPort <= 0)
 202     rxPort = 5000;
 203   mCallsign = fgGetString("/sim/multiplay/callsign");
 204   if (mCallsign.empty())
 205     // FIXME: use getpwuid
 206     mCallsign = "JohnDoe";
 207   string rxAddress = fgGetString("/sim/multiplay/rxhost");
 208   if (rxAddress.empty())
 209     rxAddress = "127.0.0.1";
 210   short txPort = fgGetInt("/sim/multiplay/txport");
 211   string txAddress = fgGetString("/sim/multiplay/txhost");
 212   if (txPort > 0 && !txAddress.empty()) {
 213     mHaveServer = true;
 214     mServer.set(txAddress.c_str(), txPort);
 215   }
 216   SG_LOG(SG_NETWORK,SG_INFO,"FGMultiplayMgr::init-txaddress= "<<txAddress);
 217   SG_LOG(SG_NETWORK,SG_INFO,"FGMultiplayMgr::init-txport= "<<txPort );
 218   SG_LOG(SG_NETWORK,SG_INFO,"FGMultiplayMgr::init-rxaddress="<<rxAddress );
 219   SG_LOG(SG_NETWORK,SG_INFO,"FGMultiplayMgr::init-rxport= "<<rxPort);
 220   SG_LOG(SG_NETWORK,SG_INFO,"FGMultiplayMgr::init-callsign= "<<mCallsign);
 221   mSocket = new netSocket();
 222   if (!mSocket->open(false)) {
 223     SG_LOG( SG_NETWORK, SG_ALERT,
 224             "FGMultiplayMgr::init - Failed to create data socket" );
 225     return false;
 226   }
 227   mSocket->setBlocking(false);
 228   if (mSocket->bind(rxAddress.c_str(), rxPort) != 0) {
 229     perror("bind");
 230     SG_LOG( SG_NETWORK, SG_ALERT,
 231             "FGMultiplayMgr::Open - Failed to bind receive socket" );
 232     return false;
 233   }
 234   mInitialised = true;
 235   return true;
 236 } // FGMultiplayMgr::init()
 237 //////////////////////////////////////////////////////////////////////
 238
 239 //////////////////////////////////////////////////////////////////////
 240 //
 241 //  Closes and deletes the local player object. Closes
 242 //  and deletes the tx socket. Resets the object state to unitialised.
 243 //
 244 //////////////////////////////////////////////////////////////////////
 245 void
 246 FGMultiplayMgr::Close (void)
 247 {
 248   mMultiPlayerMap.clear();
 249
 250   if (mSocket) {
 251     mSocket->close();
 252     delete mSocket;
 253     mSocket = 0;
 254   }
 255   mInitialised = false;
 256 } // FGMultiplayMgr::Close(void)
 257 //////////////////////////////////////////////////////////////////////
 258
 259 //////////////////////////////////////////////////////////////////////
 260 //
 261 //  Description: Sends the position data for the local position.
 262 //
 263 //////////////////////////////////////////////////////////////////////
 264 void
 265 FGMultiplayMgr::SendMyPosition(const FGExternalMotionData& motionInfo)
 266 {
 267   if ((! mInitialised) || (! mHaveServer)) {
 268     if (! mInitialised)
 269       SG_LOG( SG_NETWORK, SG_ALERT,
 270               "FGMultiplayMgr::SendMyPosition - not initialised" );
 271     if (! mHaveServer)
 272       SG_LOG( SG_NETWORK, SG_ALERT,
 273               "FGMultiplayMgr::SendMyPosition - no server" );
 274     return;
 275   }
 276
 277   T_PositionMsg PosMsg;
 278   strncpy(PosMsg.Model, fgGetString("/sim/model/path"), MAX_MODEL_NAME_LEN);
 279   PosMsg.Model[MAX_MODEL_NAME_LEN - 1] = '\0';
 280
 281   PosMsg.time = XDR_encode_double (motionInfo.time);
 282   PosMsg.lag = XDR_encode_double (motionInfo.lag);
 283   for (unsigned i = 0 ; i < 3; ++i)
 284     PosMsg.position[i] = XDR_encode_double (motionInfo.position(i));
 285   SGVec3f angleAxis;
 286   motionInfo.orientation.getAngleAxis(angleAxis);
 287   for (unsigned i = 0 ; i < 3; ++i)
 288     PosMsg.orientation[i] = XDR_encode_float (angleAxis(i));
 289   for (unsigned i = 0 ; i < 3; ++i)
 290     PosMsg.linearVel[i] = XDR_encode_float (motionInfo.linearVel(i));
 291   for (unsigned i = 0 ; i < 3; ++i)
 292     PosMsg.angularVel[i] = XDR_encode_float (motionInfo.angularVel(i));
 293   for (unsigned i = 0 ; i < 3; ++i)
 294     PosMsg.linearAccel[i] = XDR_encode_float (motionInfo.linearAccel(i));
 295   for (unsigned i = 0 ; i < 3; ++i)
 296     PosMsg.angularAccel[i] = XDR_encode_float (motionInfo.angularAccel(i));
 297
 298   char Msg[MAX_PACKET_SIZE];
 299   memcpy(Msg + sizeof(T_MsgHdr), &PosMsg, sizeof(T_PositionMsg));
 300
 301   char* ptr = Msg + sizeof(T_MsgHdr) + sizeof(T_PositionMsg);
 302   std::vector<FGPropertyData*>::const_iterator it;
 303   it = motionInfo.properties.begin();
 304   //cout << "OUTPUT PROPERTIES\n";
 305   while (it != motionInfo.properties.end()
 306          && ptr < (Msg + MAX_PACKET_SIZE - sizeof(xdr_data_t))) {
 307
 308     // First elements is the ID
 309     xdr_data_t xdr = XDR_encode_uint32((*it)->id);
 310     memcpy(ptr, &xdr, sizeof(xdr_data_t));
 311     ptr += sizeof(xdr_data_t);
 312
 313     // The actual data representation depends on the type
 314     switch ((*it)->type) {
 315       case SGPropertyNode::INT:
 316       case SGPropertyNode::BOOL:
 317       case SGPropertyNode::LONG:
 318         xdr = XDR_encode_uint32((*it)->int_value);
 319         memcpy(ptr, &xdr, sizeof(xdr_data_t));
 320         ptr += sizeof(xdr_data_t);
 321         //cout << "Prop:" << (*it)->id << " " << (*it)->type << " "<< (*it)->int_value << "\n";
 322         break;
 323       case SGPropertyNode::FLOAT:
 324       case SGPropertyNode::DOUBLE:
 325         xdr = XDR_encode_float((*it)->float_value);;
 326         memcpy(ptr, &xdr, sizeof(xdr_data_t));
 327         ptr += sizeof(xdr_data_t);
 328         //cout << "Prop:" << (*it)->id << " " << (*it)->type << " "<< (*it)->float_value << "\n";
 329         break;
 330       case SGPropertyNode::STRING:
 331       case SGPropertyNode::UNSPECIFIED:
 332         {
 333           // String is complicated. It consists of
 334           // The length of the string
 335           // The string itself
 336           // Padding to the nearest 4-bytes.
 337           const char* lcharptr = (*it)->string_value;
 338
 339           if (lcharptr != 0)
 340           {
 341             // Add the length
 342             ////cout << "String length: " << strlen(lcharptr) << "\n";
 343             uint32_t len = strlen(lcharptr);
 344             //cout << "String length unint32: " << len << "\n";
 345             xdr = XDR_encode_uint32(len);
 346             memcpy(ptr, &xdr, sizeof(xdr_data_t));
 347             ptr += sizeof(xdr_data_t);
 348
 349             if (len != 0)
 350             {
 351
 352               // Now the text itself
 353               int lcount = 0;
 354               while ((*lcharptr != '\0') && (lcount < MAX_TEXT_SIZE))
 355               {
 356                 xdr = XDR_encode_int8(*lcharptr);
 357                 memcpy(ptr, &xdr, sizeof(xdr_data_t));
 358                 ptr += sizeof(xdr_data_t);
 359                 lcharptr++;
 360                 lcount++;
 361               }
 362
 363               //cout << "Prop:" << (*it)->id << " " << (*it)->type << " " << len << " " << (*it)->string_value;
 364
 365               // Now pad if required
 366               while ((lcount % 4) != 0)
 367               {
 368                 xdr = XDR_encode_int8(0);
 369                 memcpy(ptr, &xdr, sizeof(xdr_data_t));
 370                 ptr += sizeof(xdr_data_t);
 371                 lcount++;
 372                 //cout << "0";
 373               }
 374
 375               //cout << "\n";
 376             }
 377           }
 378           else
 379           {
 380             // Nothing to encode
 381             xdr = XDR_encode_uint32(0);
 382             memcpy(ptr, &xdr, sizeof(xdr_data_t));
 383             ptr += sizeof(xdr_data_t);
 384             //cout << "Prop:" << (*it)->id << " " << (*it)->type << " 0\n";
 385           }
 386
 387         }
 388         break;
 389
 390       default:
 391         //cout << " Unknown Type: " << (*it)->type << "\n";
 392         xdr = XDR_encode_float((*it)->float_value);;
 393         memcpy(ptr, &xdr, sizeof(xdr_data_t));
 394         ptr += sizeof(xdr_data_t);
 395         //cout << "Prop:" << (*it)->id << " " << (*it)->type << " "<< (*it)->float_value << "\n";
 396         break;
 397     }
 398
 399     ++it;
 400   }
 401
 402   T_MsgHdr MsgHdr;
 403   FillMsgHdr(&MsgHdr, POS_DATA_ID, ptr - Msg);
 404   memcpy(Msg, &MsgHdr, sizeof(T_MsgHdr));
 405
 406   mSocket->sendto(Msg, ptr - Msg, 0, &mServer);
 407   SG_LOG(SG_NETWORK, SG_DEBUG, "FGMultiplayMgr::SendMyPosition");
 408 } // FGMultiplayMgr::SendMyPosition()
 409 //////////////////////////////////////////////////////////////////////
 410
 411 //////////////////////////////////////////////////////////////////////
 412 //
 413 //  Name: SendTextMessage
 414 //  Description: Sends a message to the player. The message must
 415 //  contain a valid and correctly filled out header and optional
 416 //  message body.
 417 //
 418 //////////////////////////////////////////////////////////////////////
 419 void
 420 FGMultiplayMgr::SendTextMessage(const string &MsgText)
 421 {
 422   if (!mInitialised || !mHaveServer)
 423     return;
 424
 425   T_MsgHdr MsgHdr;
 426   FillMsgHdr(&MsgHdr, CHAT_MSG_ID);
 427   //////////////////////////////////////////////////
 428   // Divide the text string into blocks that fit
 429   // in the message and send the blocks.
 430   //////////////////////////////////////////////////
 431   unsigned iNextBlockPosition = 0;
 432   T_ChatMsg ChatMsg;
 433
 434   char Msg[sizeof(T_MsgHdr) + sizeof(T_ChatMsg)];
 435   while (iNextBlockPosition < MsgText.length()) {
 436     strncpy (ChatMsg.Text,
 437              MsgText.substr(iNextBlockPosition, MAX_CHAT_MSG_LEN - 1).c_str(),
 438              MAX_CHAT_MSG_LEN);
 439     ChatMsg.Text[MAX_CHAT_MSG_LEN - 1] = '\0';
 440     memcpy (Msg, &MsgHdr, sizeof(T_MsgHdr));
 441     memcpy (Msg + sizeof(T_MsgHdr), &ChatMsg, sizeof(T_ChatMsg));
 442     mSocket->sendto (Msg, sizeof(T_MsgHdr) + sizeof(T_ChatMsg), 0, &mServer);
 443     iNextBlockPosition += MAX_CHAT_MSG_LEN - 1;
 444
 445   }
 446
 447
 448 } // FGMultiplayMgr::SendTextMessage ()
 449 //////////////////////////////////////////////////////////////////////
 450
 451 //////////////////////////////////////////////////////////////////////
 452 //
 453 //  Name: ProcessData
 454 //  Description: Processes data waiting at the receive socket. The
 455 //  processing ends when there is no more data at the socket.
 456 //
 457 //////////////////////////////////////////////////////////////////////
 458 void
 459 FGMultiplayMgr::Update(void)
 460 {
 461   if (!mInitialised)
 462     return;
 463
 464   /// Just for expiry
 465   SGTimeStamp timestamper;
 466   timestamper.stamp();
 467   long stamp = timestamper.get_seconds();
 468
 469   //////////////////////////////////////////////////
 470   //  Read the receive socket and process any data
 471   //////////////////////////////////////////////////
 472   int bytes;
 473   do {
 474     char Msg[MAX_PACKET_SIZE];
 475     //////////////////////////////////////////////////
 476     //  Although the recv call asks for
 477     //  MAX_PACKET_SIZE of data, the number of bytes
 478     //  returned will only be that of the next
 479     //  packet waiting to be processed.
 480     //////////////////////////////////////////////////
 481     netAddress SenderAddress;
 482     bytes = mSocket->recvfrom(Msg, sizeof(Msg), 0, &SenderAddress);
 483     //////////////////////////////////////////////////
 484     //  no Data received
 485     //////////////////////////////////////////////////
 486     if (bytes <= 0) {
 487       if (errno != EAGAIN && errno != 0) // MSVC output "NoError" otherwise
 488         perror("FGMultiplayMgr::MP_ProcessData");
 489       break;
 490     }
 491     if (bytes <= sizeof(T_MsgHdr)) {
 492       SG_LOG( SG_NETWORK, SG_ALERT, "FGMultiplayMgr::MP_ProcessData - "
 493               << "received message with insufficient data" );
 494       break;
 495     }
 496     //////////////////////////////////////////////////
 497     //  Read header
 498     //////////////////////////////////////////////////
 499     T_MsgHdr* MsgHdr = (T_MsgHdr *)Msg;
 500     MsgHdr->Magic       = XDR_decode_uint32 (MsgHdr->Magic);
 501     MsgHdr->Version     = XDR_decode_uint32 (MsgHdr->Version);
 502     MsgHdr->MsgId       = XDR_decode_uint32 (MsgHdr->MsgId);
 503     MsgHdr->MsgLen      = XDR_decode_uint32 (MsgHdr->MsgLen);
 504     MsgHdr->ReplyPort   = XDR_decode_uint32 (MsgHdr->ReplyPort);
 505     if (MsgHdr->Magic != MSG_MAGIC) {
 506       SG_LOG( SG_NETWORK, SG_ALERT, "FGMultiplayMgr::MP_ProcessData - "
 507               << "message has invalid magic number!" );
 508     }
 509     if (MsgHdr->Version != PROTO_VER) {
 510       SG_LOG( SG_NETWORK, SG_ALERT, "FGMultiplayMgr::MP_ProcessData - "
 511               << "message has invalid protocoll number!" );
 512     }
 513     if (MsgHdr->MsgLen != bytes) {
 514       SG_LOG( SG_NETWORK, SG_ALERT, "FGMultiplayMgr::MP_ProcessData - "
 515               << "message has invalid length!" );
 516     }
 517     //////////////////////////////////////////////////
 518     //  Process messages
 519     //////////////////////////////////////////////////
 520     switch (MsgHdr->MsgId) {
 521     case CHAT_MSG_ID:
 522       ProcessChatMsg(Msg, SenderAddress);
 523       break;
 524     case POS_DATA_ID:
 525       ProcessPosMsg(Msg, SenderAddress, bytes, stamp);
 526       break;
 527     case UNUSABLE_POS_DATA_ID:
 528     case OLD_OLD_POS_DATA_ID:
 529     case OLD_PROP_MSG_ID:
 530     case OLD_POS_DATA_ID:
 531       break;
 532     default:
 533       SG_LOG( SG_NETWORK, SG_ALERT, "FGMultiplayMgr::MP_ProcessData - "
 534               << "Unknown message Id received: " << MsgHdr->MsgId );
 535       break;
 536     }
 537   } while (bytes > 0);
 538
 539   // check for expiry
 540   MultiPlayerMap::iterator it = mMultiPlayerMap.begin();
 541   while (it != mMultiPlayerMap.end()) {
 542     if (it->second->getLastTimestamp() + 10 < stamp) {
 543       std::string name = it->first;
 544       it->second->setDie(true);
 545       mMultiPlayerMap.erase(it);
 546       it = mMultiPlayerMap.upper_bound(name);
 547     } else
 548       ++it;
 549   }
 550 } // FGMultiplayMgr::ProcessData(void)
 551 //////////////////////////////////////////////////////////////////////
 552
 553 //////////////////////////////////////////////////////////////////////
 554 //
 555 //  handle a position message
 556 //
 557 //////////////////////////////////////////////////////////////////////
 558 void
 559 FGMultiplayMgr::ProcessPosMsg(const char *Msg, netAddress & SenderAddress,
 560                               unsigned len, long stamp)
 561 {
 562   T_MsgHdr* MsgHdr = (T_MsgHdr *)Msg;
 563   if (MsgHdr->MsgLen < sizeof(T_MsgHdr) + sizeof(T_PositionMsg)) {
 564     SG_LOG( SG_NETWORK, SG_ALERT, "FGMultiplayMgr::MP_ProcessData - "
 565             << "Position message received with insufficient data" );
 566     return;
 567   }
 568   T_PositionMsg* PosMsg = (T_PositionMsg *)(Msg + sizeof(T_MsgHdr));
 569   FGExternalMotionData motionInfo;
 570   motionInfo.time = XDR_decode_double(PosMsg->time);
 571   motionInfo.lag = XDR_decode_double(PosMsg->lag);
 572   for (unsigned i = 0; i < 3; ++i)
 573     motionInfo.position(i) = XDR_decode_double(PosMsg->position[i]);
 574   SGVec3f angleAxis;
 575   for (unsigned i = 0; i < 3; ++i)
 576     angleAxis(i) = XDR_decode_float(PosMsg->orientation[i]);
 577   motionInfo.orientation = SGQuatf::fromAngleAxis(angleAxis);
 578   for (unsigned i = 0; i < 3; ++i)
 579     motionInfo.linearVel(i) = XDR_decode_float(PosMsg->linearVel[i]);
 580   for (unsigned i = 0; i < 3; ++i)
 581     motionInfo.angularVel(i) = XDR_decode_float(PosMsg->angularVel[i]);
 582   for (unsigned i = 0; i < 3; ++i)
 583     motionInfo.linearAccel(i) = XDR_decode_float(PosMsg->linearAccel[i]);
 584   for (unsigned i = 0; i < 3; ++i)
 585     motionInfo.angularAccel(i) = XDR_decode_float(PosMsg->angularAccel[i]);
 586
 587
 588   //cout << "INPUT MESSAGE\n";
 589   xdr_data_t* xdr = (xdr_data_t*)
 590                    (Msg + sizeof(T_MsgHdr) + sizeof(T_PositionMsg));
 591   while ((char*)xdr < Msg + len) {
 592     FGPropertyData* pData = new FGPropertyData;
 593     SGPropertyNode::Type type = SGPropertyNode::UNSPECIFIED;
 594
 595     // First element is always the ID
 596     pData->id = XDR_decode_uint32(*xdr);
 597     //cout << pData->id << " ";
 598     xdr++;
 599
 600     // Check the ID actually exists and get the type
 601     unsigned i = 0;
 602     bool found = false;
 603     while (FGMultiplayMgr::sIdPropertyList[i].name)
 604     {
 605       if (sIdPropertyList[i].id == pData->id)
 606       {
 607         found = true;
 608         pData->type = sIdPropertyList[i].type;
 609       }
 610
 611       i++;
 612     }
 613
 614     if (found == true)
 615     {
 616       // How we decode the remainder of the property depends on the type
 617       switch (pData->type) {
 618         case SGPropertyNode::INT:
 619         case SGPropertyNode::BOOL:
 620         case SGPropertyNode::LONG:
 621           pData->int_value = XDR_decode_uint32(*xdr);
 622           xdr++;
 623           //cout << pData->int_value << "\n";
 624           break;
 625         case SGPropertyNode::FLOAT:
 626         case SGPropertyNode::DOUBLE:
 627           pData->float_value = XDR_decode_float(*xdr);
 628           xdr++;
 629           //cout << pData->float_value << "\n";
 630           break;
 631         case SGPropertyNode::STRING:
 632         case SGPropertyNode::UNSPECIFIED:
 633           {
 634             // String is complicated. It consists of
 635             // The length of the string
 636             // The string itself
 637             // Padding to the nearest 4-bytes.
 638             uint32_t length = XDR_decode_uint32(*xdr);
 639             xdr++;
 640             //cout << length << " ";
 641
 642             if ((length > 0) && (length < MAX_TEXT_SIZE))
 643             {
 644               pData->string_value = new char[length + 1];
 645               //cout << " String: ";
 646
 647               for (int i = 0; i < length; i++)
 648               {
 649                 pData->string_value[i] = (char) XDR_decode_int8(*xdr);
 650                 xdr++;
 651                 //cout << pData->string_value[i];
 652               }
 653
 654               pData->string_value[length] = '\0';
 655
 656               // Now handle the padding
 657               while ((length % 4) != 0)
 658               {
 659                 xdr++;
 660                 length++;
 661                 //cout << "0";
 662               }
 663             }
 664             else
 665             {
 666               pData->string_value = new char[1];
 667               pData->string_value[0] = '\0';
 668             }
 669
 670             //cout << "\n";
 671           }
 672           break;
 673
 674         default:
 675           pData->float_value = XDR_decode_float(*xdr);
 676           cerr << "Unknown Prop type " << pData->id << " " << pData->type << "\n";
 677           xdr++;
 678           break;
 679       }
 680
 681       motionInfo.properties.push_back(pData);
 682     }
 683     else
 684     {
 685       // We failed to find the property. We'll try the next packet immediately.
 686       //cout << " Unknown\n";
 687     }
 688   }
 689
 690   FGAIMultiplayer* mp = getMultiplayer(MsgHdr->Callsign);
 691   if (!mp)
 692     mp = addMultiplayer(MsgHdr->Callsign, PosMsg->Model);
 693   mp->addMotionInfo(motionInfo, stamp);
 694 } // FGMultiplayMgr::ProcessPosMsg()
 695 //////////////////////////////////////////////////////////////////////
 696
 697 //////////////////////////////////////////////////////////////////////
 698 //
 699 //  handle a chat message
 700 //  FIXME: display chat message withi flightgear
 701 //
 702 //////////////////////////////////////////////////////////////////////
 703 void
 704 FGMultiplayMgr::ProcessChatMsg(const char *Msg, netAddress& SenderAddress)
 705 {
 706   T_MsgHdr* MsgHdr = (T_MsgHdr *)Msg;
 707   if (MsgHdr->MsgLen < sizeof(T_MsgHdr) + 1) {
 708     SG_LOG( SG_NETWORK, SG_ALERT, "FGMultiplayMgr::MP_ProcessData - "
 709             << "Chat message received with insufficient data" );
 710     return;
 711   }
 712
 713   char *MsgBuf = new char[MsgHdr->MsgLen - sizeof(T_MsgHdr)];
 714   strncpy(MsgBuf, ((T_ChatMsg *)(Msg + sizeof(T_MsgHdr)))->Text,
 715           MsgHdr->MsgLen - sizeof(T_MsgHdr));
 716   MsgBuf[MsgHdr->MsgLen - sizeof(T_MsgHdr) - 1] = '\0';
 717
 718   T_ChatMsg* ChatMsg = (T_ChatMsg *)(Msg + sizeof(T_MsgHdr));
 719   SG_LOG ( SG_NETWORK, SG_ALERT, "Chat [" << MsgHdr->Callsign << "]"
 720            << " " << MsgBuf << endl);
 721
 722   delete [] MsgBuf;
 723 } // FGMultiplayMgr::ProcessChatMsg ()
 724 //////////////////////////////////////////////////////////////////////
 725
 726 void
 727 FGMultiplayMgr::FillMsgHdr(T_MsgHdr *MsgHdr, int MsgId, unsigned _len)
 728 {
 729   uint32_t len;
 730   switch (MsgId) {
 731   case CHAT_MSG_ID:
 732     len = sizeof(T_MsgHdr) + sizeof(T_ChatMsg);
 733     break;
 734   case POS_DATA_ID:
 735     len = _len;
 736     break;
 737   default:
 738     len = sizeof(T_MsgHdr);
 739     break;
 740   }
 741   MsgHdr->Magic           = XDR_encode_uint32(MSG_MAGIC);
 742   MsgHdr->Version         = XDR_encode_uint32(PROTO_VER);
 743   MsgHdr->MsgId           = XDR_encode_uint32(MsgId);
 744   MsgHdr->MsgLen          = XDR_encode_uint32(len);
 745   MsgHdr->ReplyAddress    = 0; // Are obsolete, keep them for the server for
 746   MsgHdr->ReplyPort       = 0; // now
 747   strncpy(MsgHdr->Callsign, mCallsign.c_str(), MAX_CALLSIGN_LEN);
 748   MsgHdr->Callsign[MAX_CALLSIGN_LEN - 1] = '\0';
 749 }
 750
 751 FGAIMultiplayer*
 752 FGMultiplayMgr::addMultiplayer(const std::string& callsign,
 753                                const std::string& modelName)
 754 {
 755   if (0 < mMultiPlayerMap.count(callsign))
 756     return mMultiPlayerMap[callsign];
 757
 758   FGAIMultiplayer* mp = new FGAIMultiplayer;
 759   mp->setPath(modelName.c_str());
 760   mp->setCallSign(callsign);
 761   mMultiPlayerMap[callsign] = mp;
 762
 763   FGAIManager *aiMgr = (FGAIManager*)globals->get_subsystem("ai_model");
 764   if (aiMgr) {
 765     aiMgr->attach(mp);
 766
 767     /// FIXME: that must follow the attach ATM ...
 768     unsigned i = 0;
 769     while (sIdPropertyList[i].name) {
 770       mp->addPropertyId(sIdPropertyList[i].id, sIdPropertyList[i].name);
 771       ++i;
 772     }
 773   }
 774
 775   return mp;
 776 }
 777
 778 FGAIMultiplayer*
 779 FGMultiplayMgr::getMultiplayer(const std::string& callsign)
 780 {
 781   if (0 < mMultiPlayerMap.count(callsign))
 782     return mMultiPlayerMap[callsign];
 783   else
 784     return 0;
 785 }