src/MultiPlayer/multiplaymgr.cxx

   1 //////////////////////////////////////////////////////////////////////
   2 //
   3 // multiplaymgr.hpp
   4 //
   5 // Written by Duncan McCreanor, started February 2003.
   6 // duncan.mccreanor@airservicesaustralia.com
   7 //
   8 // Copyright (C) 2003  Airservices Australia
   9 // Copyright (C) 2005  Oliver Schroeder
  10 // Copyright (C) 2006  Mathias Froehlich
  11 //
  12 // This program is free software; you can redistribute it and/or
  13 // modify it under the terms of the GNU General Public License as
  14 // published by the Free Software Foundation; either version 2 of the
  15 // License, or (at your option) any later version.
  16 //
  17 // This program is distributed in the hope that it will be useful, but
  18 // WITHOUT ANY WARRANTY; without even the implied warranty of
  19 // MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  20 // General Public License for more details.
  21 //
  22 // You should have received a copy of the GNU General Public License
  23 // along with this program; if not, write to the Free Software
  24 // Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301, USA.
  25 //
  26 // $Id$
  27 //
  28 //////////////////////////////////////////////////////////////////////
  29
  30 #ifdef HAVE_CONFIG_H
  31 #include <config.h>
  32 #endif
  33
  34 #include <iostream>
  35 #include <plib/netSocket.h>
  36
  37 #include <simgear/misc/stdint.hxx>
  38 #include <simgear/timing/timestamp.hxx>
  39 #include <simgear/debug/logstream.hxx>
  40 #include <simgear/props/props.hxx>
  41
  42 #include <AIModel/AIManager.hxx>
  43 #include <Main/fg_props.hxx>
  44 #include "multiplaymgr.hxx"
  45 #include "mpmessages.hxx"
  46
  47 using std::cerr;
  48
  49 #define MAX_PACKET_SIZE 1200
  50 #define MAX_TEXT_SIZE 128
  51
  52 // These constants are provided so that the ident
  53 // command can list file versions
  54 const char sMULTIPLAYMGR_BID[] = "$Id$";
  55 const char sMULTIPLAYMGR_HID[] = MULTIPLAYTXMGR_HID;
  56
  57 // A static map of protocol property id values to property paths,
  58 // This should be extendable dynamically for every specific aircraft ...
  59 // For now only that static list
  60 FGMultiplayMgr::IdPropertyList
  61 FGMultiplayMgr::sIdPropertyList[] = {
  62   {100, "surface-positions/left-aileron-pos-norm",  SGPropertyNode::FLOAT},
  63   {101, "surface-positions/right-aileron-pos-norm", SGPropertyNode::FLOAT},
  64   {102, "surface-positions/elevator-pos-norm",      SGPropertyNode::FLOAT},
  65   {103, "surface-positions/rudder-pos-norm",        SGPropertyNode::FLOAT},
  66   {104, "surface-positions/flap-pos-norm",          SGPropertyNode::FLOAT},
  67   {105, "surface-positions/speedbrake-pos-norm",    SGPropertyNode::FLOAT},
  68   {106, "gear/tailhook/position-norm",              SGPropertyNode::FLOAT},
  69   {107, "gear/launchbar/position-norm",             SGPropertyNode::FLOAT},
  70   {108, "gear/launchbar/state",                     SGPropertyNode::STRING},
  71   {109, "gear/launchbar/holdback-position-norm",    SGPropertyNode::FLOAT},
  72   {110, "canopy/position-norm",                     SGPropertyNode::FLOAT},
  73
  74   {200, "gear/gear[0]/compression-norm",           SGPropertyNode::FLOAT},
  75   {201, "gear/gear[0]/position-norm",              SGPropertyNode::FLOAT},
  76   {210, "gear/gear[1]/compression-norm",           SGPropertyNode::FLOAT},
  77   {211, "gear/gear[1]/position-norm",              SGPropertyNode::FLOAT},
  78   {220, "gear/gear[2]/compression-norm",           SGPropertyNode::FLOAT},
  79   {221, "gear/gear[2]/position-norm",              SGPropertyNode::FLOAT},
  80   {230, "gear/gear[3]/compression-norm",           SGPropertyNode::FLOAT},
  81   {231, "gear/gear[3]/position-norm",              SGPropertyNode::FLOAT},
  82   {240, "gear/gear[4]/compression-norm",           SGPropertyNode::FLOAT},
  83   {241, "gear/gear[4]/position-norm",              SGPropertyNode::FLOAT},
  84
  85   {300, "engines/engine[0]/n1",  SGPropertyNode::FLOAT},
  86   {301, "engines/engine[0]/n2",  SGPropertyNode::FLOAT},
  87   {302, "engines/engine[0]/rpm", SGPropertyNode::FLOAT},
  88   {310, "engines/engine[1]/n1",  SGPropertyNode::FLOAT},
  89   {311, "engines/engine[1]/n2",  SGPropertyNode::FLOAT},
  90   {312, "engines/engine[1]/rpm", SGPropertyNode::FLOAT},
  91   {320, "engines/engine[2]/n1",  SGPropertyNode::FLOAT},
  92   {321, "engines/engine[2]/n2",  SGPropertyNode::FLOAT},
  93   {322, "engines/engine[2]/rpm", SGPropertyNode::FLOAT},
  94   {330, "engines/engine[3]/n1",  SGPropertyNode::FLOAT},
  95   {331, "engines/engine[3]/n2",  SGPropertyNode::FLOAT},
  96   {332, "engines/engine[3]/rpm", SGPropertyNode::FLOAT},
  97   {340, "engines/engine[4]/n1",  SGPropertyNode::FLOAT},
  98   {341, "engines/engine[4]/n2",  SGPropertyNode::FLOAT},
  99   {342, "engines/engine[4]/rpm", SGPropertyNode::FLOAT},
 100   {350, "engines/engine[5]/n1",  SGPropertyNode::FLOAT},
 101   {351, "engines/engine[5]/n2",  SGPropertyNode::FLOAT},
 102   {352, "engines/engine[5]/rpm", SGPropertyNode::FLOAT},
 103   {360, "engines/engine[6]/n1",  SGPropertyNode::FLOAT},
 104   {361, "engines/engine[6]/n2",  SGPropertyNode::FLOAT},
 105   {362, "engines/engine[6]/rpm", SGPropertyNode::FLOAT},
 106   {370, "engines/engine[7]/n1",  SGPropertyNode::FLOAT},
 107   {371, "engines/engine[7]/n2",  SGPropertyNode::FLOAT},
 108   {372, "engines/engine[7]/rpm", SGPropertyNode::FLOAT},
 109   {380, "engines/engine[8]/n1",  SGPropertyNode::FLOAT},
 110   {381, "engines/engine[8]/n2",  SGPropertyNode::FLOAT},
 111   {382, "engines/engine[8]/rpm", SGPropertyNode::FLOAT},
 112   {390, "engines/engine[9]/n1",  SGPropertyNode::FLOAT},
 113   {391, "engines/engine[9]/n2",  SGPropertyNode::FLOAT},
 114   {392, "engines/engine[9]/rpm", SGPropertyNode::FLOAT},
 115
 116   {800, "rotors/main/rpm", SGPropertyNode::FLOAT},
 117   {801, "rotors/tail/rpm", SGPropertyNode::FLOAT},
 118   {810, "rotors/main/blade[0]/position-deg",  SGPropertyNode::FLOAT},
 119   {811, "rotors/main/blade[1]/position-deg",  SGPropertyNode::FLOAT},
 120   {812, "rotors/main/blade[2]/position-deg",  SGPropertyNode::FLOAT},
 121   {813, "rotors/main/blade[3]/position-deg",  SGPropertyNode::FLOAT},
 122   {820, "rotors/main/blade[0]/flap-deg",  SGPropertyNode::FLOAT},
 123   {821, "rotors/main/blade[1]/flap-deg",  SGPropertyNode::FLOAT},
 124   {822, "rotors/main/blade[2]/flap-deg",  SGPropertyNode::FLOAT},
 125   {823, "rotors/main/blade[3]/flap-deg",  SGPropertyNode::FLOAT},
 126   {830, "rotors/tail/blade[0]/position-deg",  SGPropertyNode::FLOAT},
 127   {831, "rotors/tail/blade[1]/position-deg",  SGPropertyNode::FLOAT},
 128
 129   {900, "sim/hitches/aerotow/tow/length",                       SGPropertyNode::FLOAT},
 130   {901, "sim/hitches/aerotow/tow/elastic-constant",             SGPropertyNode::FLOAT},
 131   {902, "sim/hitches/aerotow/tow/weight-per-m-kg-m",            SGPropertyNode::FLOAT},
 132   {903, "sim/hitches/aerotow/tow/dist",                         SGPropertyNode::FLOAT},
 133   {904, "sim/hitches/aerotow/tow/connected-to-property-node",   SGPropertyNode::BOOL},
 134   {905, "sim/hitches/aerotow/tow/connected-to-ai-or-mp-callsign",   SGPropertyNode::STRING},
 135   {906, "sim/hitches/aerotow/tow/brake-force",                  SGPropertyNode::FLOAT},
 136   {907, "sim/hitches/aerotow/tow/end-force-x",                  SGPropertyNode::FLOAT},
 137   {908, "sim/hitches/aerotow/tow/end-force-y",                  SGPropertyNode::FLOAT},
 138   {909, "sim/hitches/aerotow/tow/end-force-z",                  SGPropertyNode::FLOAT},
 139   {930, "sim/hitches/aerotow/is-slave",                         SGPropertyNode::BOOL},
 140   {931, "sim/hitches/aerotow/speed-in-tow-direction",           SGPropertyNode::FLOAT},
 141   {932, "sim/hitches/aerotow/open",                             SGPropertyNode::BOOL},
 142   {933, "sim/hitches/aerotow/local-pos-x",                      SGPropertyNode::FLOAT},
 143   {934, "sim/hitches/aerotow/local-pos-y",                      SGPropertyNode::FLOAT},
 144   {935, "sim/hitches/aerotow/local-pos-z",                      SGPropertyNode::FLOAT},
 145
 146   {1001, "controls/flight/slats",  SGPropertyNode::FLOAT},
 147   {1002, "controls/flight/speedbrake",  SGPropertyNode::FLOAT},
 148   {1003, "controls/flight/spoilers",  SGPropertyNode::FLOAT},
 149   {1004, "controls/gear/gear-down",  SGPropertyNode::FLOAT},
 150   {1005, "controls/lighting/nav-lights",  SGPropertyNode::FLOAT},
 151   {1006, "controls/armament/station[0]/jettison-all",  SGPropertyNode::BOOL},
 152
 153   {1100, "sim/model/variant", SGPropertyNode::INT},
 154   {1101, "sim/model/livery/file", SGPropertyNode::STRING},
 155
 156   {10001, "sim/multiplay/transmission-freq-hz",  SGPropertyNode::STRING},
 157   {10002, "sim/multiplay/chat",  SGPropertyNode::STRING},
 158
 159   {10100, "sim/multiplay/generic/string[0]", SGPropertyNode::STRING},
 160   {10101, "sim/multiplay/generic/string[1]", SGPropertyNode::STRING},
 161   {10102, "sim/multiplay/generic/string[2]", SGPropertyNode::STRING},
 162   {10103, "sim/multiplay/generic/string[3]", SGPropertyNode::STRING},
 163   {10104, "sim/multiplay/generic/string[4]", SGPropertyNode::STRING},
 164   {10105, "sim/multiplay/generic/string[5]", SGPropertyNode::STRING},
 165   {10106, "sim/multiplay/generic/string[6]", SGPropertyNode::STRING},
 166   {10107, "sim/multiplay/generic/string[7]", SGPropertyNode::STRING},
 167   {10108, "sim/multiplay/generic/string[8]", SGPropertyNode::STRING},
 168   {10109, "sim/multiplay/generic/string[9]", SGPropertyNode::STRING},
 169
 170   {10200, "sim/multiplay/generic/float[0]", SGPropertyNode::FLOAT},
 171   {10201, "sim/multiplay/generic/float[1]", SGPropertyNode::FLOAT},
 172   {10202, "sim/multiplay/generic/float[2]", SGPropertyNode::FLOAT},
 173   {10203, "sim/multiplay/generic/float[3]", SGPropertyNode::FLOAT},
 174   {10204, "sim/multiplay/generic/float[4]", SGPropertyNode::FLOAT},
 175   {10205, "sim/multiplay/generic/float[5]", SGPropertyNode::FLOAT},
 176   {10206, "sim/multiplay/generic/float[6]", SGPropertyNode::FLOAT},
 177   {10207, "sim/multiplay/generic/float[7]", SGPropertyNode::FLOAT},
 178   {10208, "sim/multiplay/generic/float[8]", SGPropertyNode::FLOAT},
 179   {10209, "sim/multiplay/generic/float[9]", SGPropertyNode::FLOAT},
 180
 181   {10300, "sim/multiplay/generic/int[0]", SGPropertyNode::INT},
 182   {10301, "sim/multiplay/generic/int[1]", SGPropertyNode::INT},
 183   {10302, "sim/multiplay/generic/int[2]", SGPropertyNode::INT},
 184   {10303, "sim/multiplay/generic/int[3]", SGPropertyNode::INT},
 185   {10304, "sim/multiplay/generic/int[4]", SGPropertyNode::INT},
 186   {10305, "sim/multiplay/generic/int[5]", SGPropertyNode::INT},
 187   {10306, "sim/multiplay/generic/int[6]", SGPropertyNode::INT},
 188   {10307, "sim/multiplay/generic/int[7]", SGPropertyNode::INT},
 189   {10308, "sim/multiplay/generic/int[8]", SGPropertyNode::INT},
 190   {10309, "sim/multiplay/generic/int[9]", SGPropertyNode::INT},
 191
 192   /// termination
 193   {0, 0, SGPropertyNode::UNSPECIFIED}
 194 };
 195
 196 //////////////////////////////////////////////////////////////////////
 197 //
 198 //  MultiplayMgr constructor
 199 //
 200 //////////////////////////////////////////////////////////////////////
 201 FGMultiplayMgr::FGMultiplayMgr()
 202 {
 203   mSocket        = 0;
 204   mInitialised   = false;
 205   mHaveServer    = false;
 206 } // FGMultiplayMgr::FGMultiplayMgr()
 207 //////////////////////////////////////////////////////////////////////
 208
 209 //////////////////////////////////////////////////////////////////////
 210 //
 211 //  MultiplayMgr destructor
 212 //
 213 //////////////////////////////////////////////////////////////////////
 214 FGMultiplayMgr::~FGMultiplayMgr()
 215 {
 216   Close();
 217 } // FGMultiplayMgr::~FGMultiplayMgr()
 218 //////////////////////////////////////////////////////////////////////
 219
 220 //////////////////////////////////////////////////////////////////////
 221 //
 222 //  Initialise object
 223 //
 224 //////////////////////////////////////////////////////////////////////
 225 bool
 226 FGMultiplayMgr::init (void)
 227 {
 228   //////////////////////////////////////////////////
 229   //  Initialise object if not already done
 230   //////////////////////////////////////////////////
 231   if (mInitialised) {
 232     SG_LOG(SG_NETWORK, SG_WARN, "FGMultiplayMgr::init - already initialised");
 233     return false;
 234   }
 235   //////////////////////////////////////////////////
 236   //  Set members from property values
 237   //////////////////////////////////////////////////
 238   short rxPort = fgGetInt("/sim/multiplay/rxport");
 239   string rxAddress = fgGetString("/sim/multiplay/rxhost");
 240   short txPort = fgGetInt("/sim/multiplay/txport");
 241   string txAddress = fgGetString("/sim/multiplay/txhost");
 242   mCallsign = fgGetString("/sim/multiplay/callsign");
 243   if (txPort > 0 && !txAddress.empty()) {
 244     mServer.set(txAddress.c_str(), txPort);
 245     if (strncmp (mServer.getHost(), "0.0.0.0", 8) == 0) {
 246       mHaveServer = false;
 247       SG_LOG(SG_NETWORK, SG_ALERT,
 248         "FGMultiplayMgr - could not resolve '"
 249         << txAddress << "', Multiplayermode disabled");
 250     } else {
 251       mHaveServer = true;
 252     }
 253     if (rxPort <= 0)
 254       rxPort = txPort;
 255   }
 256   if (rxPort <= 0) {
 257     SG_LOG(SG_NETWORK, SG_ALERT,
 258       "FGMultiplayMgr - No receiver port, Multiplayermode disabled");
 259     return (false);
 260   }
 261   if (mCallsign.empty())
 262     mCallsign = "JohnDoe"; // FIXME: use getpwuid
 263   SG_LOG(SG_NETWORK,SG_INFO,"FGMultiplayMgr::init-txaddress= "<<txAddress);
 264   SG_LOG(SG_NETWORK,SG_INFO,"FGMultiplayMgr::init-txport= "<<txPort );
 265   SG_LOG(SG_NETWORK,SG_INFO,"FGMultiplayMgr::init-rxaddress="<<rxAddress );
 266   SG_LOG(SG_NETWORK,SG_INFO,"FGMultiplayMgr::init-rxport= "<<rxPort);
 267   SG_LOG(SG_NETWORK,SG_INFO,"FGMultiplayMgr::init-callsign= "<<mCallsign);
 268   Close(); // Should Init be called twice, close Socket first
 269            // A memory leak was reported here by valgrind
 270   mSocket = new netSocket();
 271   if (!mSocket->open(false)) {
 272     SG_LOG( SG_NETWORK, SG_ALERT,
 273             "FGMultiplayMgr::init - Failed to create data socket" );
 274     return false;
 275   }
 276   mSocket->setBlocking(false);
 277   if (mSocket->bind(rxAddress.c_str(), rxPort) != 0) {
 278     perror("bind");
 279     SG_LOG( SG_NETWORK, SG_ALERT,
 280             "FGMultiplayMgr::Open - Failed to bind receive socket" );
 281     return false;
 282   }
 283   mInitialised = true;
 284   return true;
 285 } // FGMultiplayMgr::init()
 286 //////////////////////////////////////////////////////////////////////
 287
 288 //////////////////////////////////////////////////////////////////////
 289 //
 290 //  Closes and deletes the local player object. Closes
 291 //  and deletes the tx socket. Resets the object state to unitialised.
 292 //
 293 //////////////////////////////////////////////////////////////////////
 294 void
 295 FGMultiplayMgr::Close (void)
 296 {
 297   mMultiPlayerMap.clear();
 298
 299   if (mSocket) {
 300     mSocket->close();
 301     delete mSocket;
 302     mSocket = 0;
 303   }
 304   mInitialised = false;
 305 } // FGMultiplayMgr::Close(void)
 306 //////////////////////////////////////////////////////////////////////
 307
 308 //////////////////////////////////////////////////////////////////////
 309 //
 310 //  Description: Sends the position data for the local position.
 311 //
 312 //////////////////////////////////////////////////////////////////////
 313 void
 314 FGMultiplayMgr::SendMyPosition(const FGExternalMotionData& motionInfo)
 315 {
 316   if ((! mInitialised) || (! mHaveServer))
 317         return;
 318   if (! mHaveServer) {
 319     SG_LOG( SG_NETWORK, SG_ALERT, "FGMultiplayMgr::SendMyPosition - no server");
 320     return;
 321   }
 322
 323   T_PositionMsg PosMsg;
 324   strncpy(PosMsg.Model, fgGetString("/sim/model/path"), MAX_MODEL_NAME_LEN);
 325   PosMsg.Model[MAX_MODEL_NAME_LEN - 1] = '\0';
 326
 327   PosMsg.time = XDR_encode_double (motionInfo.time);
 328   PosMsg.lag = XDR_encode_double (motionInfo.lag);
 329   for (unsigned i = 0 ; i < 3; ++i)
 330     PosMsg.position[i] = XDR_encode_double (motionInfo.position(i));
 331   SGVec3f angleAxis;
 332   motionInfo.orientation.getAngleAxis(angleAxis);
 333   for (unsigned i = 0 ; i < 3; ++i)
 334     PosMsg.orientation[i] = XDR_encode_float (angleAxis(i));
 335   for (unsigned i = 0 ; i < 3; ++i)
 336     PosMsg.linearVel[i] = XDR_encode_float (motionInfo.linearVel(i));
 337   for (unsigned i = 0 ; i < 3; ++i)
 338     PosMsg.angularVel[i] = XDR_encode_float (motionInfo.angularVel(i));
 339   for (unsigned i = 0 ; i < 3; ++i)
 340     PosMsg.linearAccel[i] = XDR_encode_float (motionInfo.linearAccel(i));
 341   for (unsigned i = 0 ; i < 3; ++i)
 342     PosMsg.angularAccel[i] = XDR_encode_float (motionInfo.angularAccel(i));
 343
 344   char Msg[MAX_PACKET_SIZE];
 345   memcpy(Msg + sizeof(T_MsgHdr), &PosMsg, sizeof(T_PositionMsg));
 346
 347   char* ptr = Msg + sizeof(T_MsgHdr) + sizeof(T_PositionMsg);
 348   std::vector<FGPropertyData*>::const_iterator it;
 349   it = motionInfo.properties.begin();
 350   //cout << "OUTPUT PROPERTIES\n";
 351   while (it != motionInfo.properties.end()
 352          && ptr + 2 * sizeof(xdr_data_t) < (Msg + MAX_PACKET_SIZE)) {
 353
 354     // First elements is the ID
 355     xdr_data_t xdr = XDR_encode_uint32((*it)->id);
 356     memcpy(ptr, &xdr, sizeof(xdr_data_t));
 357     ptr += sizeof(xdr_data_t);
 358
 359     // The actual data representation depends on the type
 360     switch ((*it)->type) {
 361       case SGPropertyNode::INT:
 362       case SGPropertyNode::BOOL:
 363       case SGPropertyNode::LONG:
 364         xdr = XDR_encode_uint32((*it)->int_value);
 365         memcpy(ptr, &xdr, sizeof(xdr_data_t));
 366         ptr += sizeof(xdr_data_t);
 367         //cout << "Prop:" << (*it)->id << " " << (*it)->type << " "<< (*it)->int_value << "\n";
 368         break;
 369       case SGPropertyNode::FLOAT:
 370       case SGPropertyNode::DOUBLE:
 371         xdr = XDR_encode_float((*it)->float_value);;
 372         memcpy(ptr, &xdr, sizeof(xdr_data_t));
 373         ptr += sizeof(xdr_data_t);
 374         //cout << "Prop:" << (*it)->id << " " << (*it)->type << " "<< (*it)->float_value << "\n";
 375         break;
 376       case SGPropertyNode::STRING:
 377       case SGPropertyNode::UNSPECIFIED:
 378         {
 379           // String is complicated. It consists of
 380           // The length of the string
 381           // The string itself
 382           // Padding to the nearest 4-bytes.
 383           const char* lcharptr = (*it)->string_value;
 384
 385           if (lcharptr != 0)
 386           {
 387             // Add the length
 388             ////cout << "String length: " << strlen(lcharptr) << "\n";
 389             uint32_t len = strlen(lcharptr);
 390             // XXX This should not be using 4 bytes per character!
 391             if (ptr + (1 + len + (4 - len % 4)) * sizeof (xdr_data_t)
 392                 >= (Msg + MAX_PACKET_SIZE))
 393                 goto escape;
 394             //cout << "String length unint32: " << len << "\n";
 395             xdr = XDR_encode_uint32(len);
 396             memcpy(ptr, &xdr, sizeof(xdr_data_t));
 397             ptr += sizeof(xdr_data_t);
 398
 399             if (len != 0)
 400             {
 401
 402               // Now the text itself
 403               // XXX This should not be using 4 bytes per character!
 404               int lcount = 0;
 405               while ((*lcharptr != '\0') && (lcount < MAX_TEXT_SIZE))
 406               {
 407                 xdr = XDR_encode_int8(*lcharptr);
 408                 memcpy(ptr, &xdr, sizeof(xdr_data_t));
 409                 ptr += sizeof(xdr_data_t);
 410                 lcharptr++;
 411                 lcount++;
 412               }
 413
 414               //cout << "Prop:" << (*it)->id << " " << (*it)->type << " " << len << " " << (*it)->string_value;
 415
 416               // Now pad if required
 417               while ((lcount % 4) != 0)
 418               {
 419                 xdr = XDR_encode_int8(0);
 420                 memcpy(ptr, &xdr, sizeof(xdr_data_t));
 421                 ptr += sizeof(xdr_data_t);
 422                 lcount++;
 423                 //cout << "0";
 424               }
 425
 426               //cout << "\n";
 427             }
 428           }
 429           else
 430           {
 431             // Nothing to encode
 432             xdr = XDR_encode_uint32(0);
 433             memcpy(ptr, &xdr, sizeof(xdr_data_t));
 434             ptr += sizeof(xdr_data_t);
 435             //cout << "Prop:" << (*it)->id << " " << (*it)->type << " 0\n";
 436           }
 437
 438         }
 439         break;
 440
 441       default:
 442         //cout << " Unknown Type: " << (*it)->type << "\n";
 443         xdr = XDR_encode_float((*it)->float_value);;
 444         memcpy(ptr, &xdr, sizeof(xdr_data_t));
 445         ptr += sizeof(xdr_data_t);
 446         //cout << "Prop:" << (*it)->id << " " << (*it)->type << " "<< (*it)->float_value << "\n";
 447         break;
 448     }
 449
 450     ++it;
 451   }
 452 escape:
 453
 454   T_MsgHdr MsgHdr;
 455   FillMsgHdr(&MsgHdr, POS_DATA_ID, ptr - Msg);
 456   memcpy(Msg, &MsgHdr, sizeof(T_MsgHdr));
 457
 458   mSocket->sendto(Msg, ptr - Msg, 0, &mServer);
 459   SG_LOG(SG_NETWORK, SG_DEBUG, "FGMultiplayMgr::SendMyPosition");
 460 } // FGMultiplayMgr::SendMyPosition()
 461 //////////////////////////////////////////////////////////////////////
 462
 463 //////////////////////////////////////////////////////////////////////
 464 //
 465 //  Name: SendTextMessage
 466 //  Description: Sends a message to the player. The message must
 467 //  contain a valid and correctly filled out header and optional
 468 //  message body.
 469 //
 470 //////////////////////////////////////////////////////////////////////
 471 void
 472 FGMultiplayMgr::SendTextMessage(const string &MsgText)
 473 {
 474   if (!mInitialised || !mHaveServer)
 475     return;
 476
 477   T_MsgHdr MsgHdr;
 478   FillMsgHdr(&MsgHdr, CHAT_MSG_ID);
 479   //////////////////////////////////////////////////
 480   // Divide the text string into blocks that fit
 481   // in the message and send the blocks.
 482   //////////////////////////////////////////////////
 483   unsigned iNextBlockPosition = 0;
 484   T_ChatMsg ChatMsg;
 485
 486   char Msg[sizeof(T_MsgHdr) + sizeof(T_ChatMsg)];
 487   while (iNextBlockPosition < MsgText.length()) {
 488     strncpy (ChatMsg.Text,
 489              MsgText.substr(iNextBlockPosition, MAX_CHAT_MSG_LEN - 1).c_str(),
 490              MAX_CHAT_MSG_LEN);
 491     ChatMsg.Text[MAX_CHAT_MSG_LEN - 1] = '\0';
 492     memcpy (Msg, &MsgHdr, sizeof(T_MsgHdr));
 493     memcpy (Msg + sizeof(T_MsgHdr), &ChatMsg, sizeof(T_ChatMsg));
 494     mSocket->sendto (Msg, sizeof(T_MsgHdr) + sizeof(T_ChatMsg), 0, &mServer);
 495     iNextBlockPosition += MAX_CHAT_MSG_LEN - 1;
 496
 497   }
 498
 499
 500 } // FGMultiplayMgr::SendTextMessage ()
 501 //////////////////////////////////////////////////////////////////////
 502
 503 //////////////////////////////////////////////////////////////////////
 504 //
 505 //  Name: ProcessData
 506 //  Description: Processes data waiting at the receive socket. The
 507 //  processing ends when there is no more data at the socket.
 508 //
 509 //////////////////////////////////////////////////////////////////////
 510 void
 511 FGMultiplayMgr::Update(void)
 512 {
 513   if (!mInitialised)
 514     return;
 515
 516   /// Just for expiry
 517   SGTimeStamp timestamper;
 518   timestamper.stamp();
 519   long stamp = timestamper.get_seconds();
 520
 521   //////////////////////////////////////////////////
 522   //  Read the receive socket and process any data
 523   //////////////////////////////////////////////////
 524   int bytes;
 525   do {
 526     char Msg[MAX_PACKET_SIZE];
 527     //////////////////////////////////////////////////
 528     //  Although the recv call asks for
 529     //  MAX_PACKET_SIZE of data, the number of bytes
 530     //  returned will only be that of the next
 531     //  packet waiting to be processed.
 532     //////////////////////////////////////////////////
 533     netAddress SenderAddress;
 534     bytes = mSocket->recvfrom(Msg, sizeof(Msg), 0, &SenderAddress);
 535     //////////////////////////////////////////////////
 536     //  no Data received
 537     //////////////////////////////////////////////////
 538     if (bytes <= 0) {
 539       if (errno != EAGAIN && errno != 0) // MSVC output "NoError" otherwise
 540         perror("FGMultiplayMgr::MP_ProcessData");
 541       break;
 542     }
 543     if (bytes <= sizeof(T_MsgHdr)) {
 544       SG_LOG( SG_NETWORK, SG_ALERT, "FGMultiplayMgr::MP_ProcessData - "
 545               << "received message with insufficient data" );
 546       break;
 547     }
 548     //////////////////////////////////////////////////
 549     //  Read header
 550     //////////////////////////////////////////////////
 551     T_MsgHdr* MsgHdr = (T_MsgHdr *)Msg;
 552     MsgHdr->Magic       = XDR_decode_uint32 (MsgHdr->Magic);
 553     MsgHdr->Version     = XDR_decode_uint32 (MsgHdr->Version);
 554     MsgHdr->MsgId       = XDR_decode_uint32 (MsgHdr->MsgId);
 555     MsgHdr->MsgLen      = XDR_decode_uint32 (MsgHdr->MsgLen);
 556     MsgHdr->ReplyPort   = XDR_decode_uint32 (MsgHdr->ReplyPort);
 557     if (MsgHdr->Magic != MSG_MAGIC) {
 558       SG_LOG( SG_NETWORK, SG_ALERT, "FGMultiplayMgr::MP_ProcessData - "
 559               << "message has invalid magic number!" );
 560       break;
 561     }
 562     if (MsgHdr->Version != PROTO_VER) {
 563       SG_LOG( SG_NETWORK, SG_ALERT, "FGMultiplayMgr::MP_ProcessData - "
 564               << "message has invalid protocoll number!" );
 565       break;
 566     }
 567     if (MsgHdr->MsgLen != bytes) {
 568       SG_LOG( SG_NETWORK, SG_ALERT, "FGMultiplayMgr::MP_ProcessData - "
 569               << "message has invalid length!" );
 570       break;
 571     }
 572     //////////////////////////////////////////////////
 573     //  Process messages
 574     //////////////////////////////////////////////////
 575     switch (MsgHdr->MsgId) {
 576     case CHAT_MSG_ID:
 577       ProcessChatMsg(Msg, SenderAddress);
 578       break;
 579     case POS_DATA_ID:
 580       ProcessPosMsg(Msg, SenderAddress, bytes, stamp);
 581       break;
 582     case UNUSABLE_POS_DATA_ID:
 583     case OLD_OLD_POS_DATA_ID:
 584     case OLD_PROP_MSG_ID:
 585     case OLD_POS_DATA_ID:
 586       break;
 587     default:
 588       SG_LOG( SG_NETWORK, SG_ALERT, "FGMultiplayMgr::MP_ProcessData - "
 589               << "Unknown message Id received: " << MsgHdr->MsgId );
 590       break;
 591     }
 592   } while (bytes > 0);
 593
 594   // check for expiry
 595   MultiPlayerMap::iterator it = mMultiPlayerMap.begin();
 596   while (it != mMultiPlayerMap.end()) {
 597     if (it->second->getLastTimestamp() + 10 < stamp) {
 598       std::string name = it->first;
 599       it->second->setDie(true);
 600       mMultiPlayerMap.erase(it);
 601       it = mMultiPlayerMap.upper_bound(name);
 602     } else
 603       ++it;
 604   }
 605 } // FGMultiplayMgr::ProcessData(void)
 606 //////////////////////////////////////////////////////////////////////
 607
 608 //////////////////////////////////////////////////////////////////////
 609 //
 610 //  handle a position message
 611 //
 612 //////////////////////////////////////////////////////////////////////
 613 void
 614 FGMultiplayMgr::ProcessPosMsg(const char *Msg, netAddress & SenderAddress,
 615                               unsigned len, long stamp)
 616 {
 617   T_MsgHdr* MsgHdr = (T_MsgHdr *)Msg;
 618   if (MsgHdr->MsgLen < sizeof(T_MsgHdr) + sizeof(T_PositionMsg)) {
 619     SG_LOG( SG_NETWORK, SG_ALERT, "FGMultiplayMgr::MP_ProcessData - "
 620             << "Position message received with insufficient data" );
 621     return;
 622   }
 623   T_PositionMsg* PosMsg = (T_PositionMsg *)(Msg + sizeof(T_MsgHdr));
 624   FGExternalMotionData motionInfo;
 625   motionInfo.time = XDR_decode_double(PosMsg->time);
 626   motionInfo.lag = XDR_decode_double(PosMsg->lag);
 627   for (unsigned i = 0; i < 3; ++i)
 628     motionInfo.position(i) = XDR_decode_double(PosMsg->position[i]);
 629   SGVec3f angleAxis;
 630   for (unsigned i = 0; i < 3; ++i)
 631     angleAxis(i) = XDR_decode_float(PosMsg->orientation[i]);
 632   motionInfo.orientation = SGQuatf::fromAngleAxis(angleAxis);
 633   for (unsigned i = 0; i < 3; ++i)
 634     motionInfo.linearVel(i) = XDR_decode_float(PosMsg->linearVel[i]);
 635   for (unsigned i = 0; i < 3; ++i)
 636     motionInfo.angularVel(i) = XDR_decode_float(PosMsg->angularVel[i]);
 637   for (unsigned i = 0; i < 3; ++i)
 638     motionInfo.linearAccel(i) = XDR_decode_float(PosMsg->linearAccel[i]);
 639   for (unsigned i = 0; i < 3; ++i)
 640     motionInfo.angularAccel(i) = XDR_decode_float(PosMsg->angularAccel[i]);
 641
 642
 643   //cout << "INPUT MESSAGE\n";
 644   xdr_data_t* xdr = (xdr_data_t*)
 645                    (Msg + sizeof(T_MsgHdr) + sizeof(T_PositionMsg));
 646   while ((char*)xdr < Msg + len) {
 647     FGPropertyData* pData = new FGPropertyData;
 648     SGPropertyNode::Type type = SGPropertyNode::UNSPECIFIED;
 649
 650     // First element is always the ID
 651     pData->id = XDR_decode_uint32(*xdr);
 652     //cout << pData->id << " ";
 653     xdr++;
 654
 655     // Check the ID actually exists and get the type
 656     unsigned i = 0;
 657     bool found = false;
 658     while (FGMultiplayMgr::sIdPropertyList[i].name)
 659     {
 660       if (sIdPropertyList[i].id == pData->id)
 661       {
 662         found = true;
 663         pData->type = sIdPropertyList[i].type;
 664       }
 665
 666       i++;
 667     }
 668
 669     if (found == true)
 670     {
 671       // How we decode the remainder of the property depends on the type
 672       switch (pData->type) {
 673         case SGPropertyNode::INT:
 674         case SGPropertyNode::BOOL:
 675         case SGPropertyNode::LONG:
 676           pData->int_value = XDR_decode_uint32(*xdr);
 677           xdr++;
 678           //cout << pData->int_value << "\n";
 679           break;
 680         case SGPropertyNode::FLOAT:
 681         case SGPropertyNode::DOUBLE:
 682           pData->float_value = XDR_decode_float(*xdr);
 683           xdr++;
 684           //cout << pData->float_value << "\n";
 685           break;
 686         case SGPropertyNode::STRING:
 687         case SGPropertyNode::UNSPECIFIED:
 688           {
 689             // String is complicated. It consists of
 690             // The length of the string
 691             // The string itself
 692             // Padding to the nearest 4-bytes.
 693             uint32_t length = XDR_decode_uint32(*xdr);
 694             xdr++;
 695             //cout << length << " ";
 696
 697             if ((length > 0) && (length < MAX_TEXT_SIZE))
 698             {
 699               pData->string_value = new char[length + 1];
 700               //cout << " String: ";
 701
 702               for (int i = 0; i < length; i++)
 703               {
 704                 pData->string_value[i] = (char) XDR_decode_int8(*xdr);
 705                 xdr++;
 706                 //cout << pData->string_value[i];
 707               }
 708
 709               pData->string_value[length] = '\0';
 710
 711               // Now handle the padding
 712               while ((length % 4) != 0)
 713               {
 714                 xdr++;
 715                 length++;
 716                 //cout << "0";
 717               }
 718             }
 719             else
 720             {
 721               pData->string_value = new char[1];
 722               pData->string_value[0] = '\0';
 723             }
 724
 725             //cout << "\n";
 726           }
 727           break;
 728
 729         default:
 730           pData->float_value = XDR_decode_float(*xdr);
 731           cerr << "Unknown Prop type " << pData->id << " " << pData->type << "\n";
 732           xdr++;
 733           break;
 734       }
 735
 736       motionInfo.properties.push_back(pData);
 737     }
 738     else
 739     {
 740       // We failed to find the property. We'll try the next packet immediately.
 741       //cout << " Unknown\n";
 742     }
 743   }
 744
 745   FGAIMultiplayer* mp = getMultiplayer(MsgHdr->Callsign);
 746   if (!mp)
 747     mp = addMultiplayer(MsgHdr->Callsign, PosMsg->Model);
 748   mp->addMotionInfo(motionInfo, stamp);
 749 } // FGMultiplayMgr::ProcessPosMsg()
 750 //////////////////////////////////////////////////////////////////////
 751
 752 //////////////////////////////////////////////////////////////////////
 753 //
 754 //  handle a chat message
 755 //  FIXME: display chat message withi flightgear
 756 //
 757 //////////////////////////////////////////////////////////////////////
 758 void
 759 FGMultiplayMgr::ProcessChatMsg(const char *Msg, netAddress& SenderAddress)
 760 {
 761   T_MsgHdr* MsgHdr = (T_MsgHdr *)Msg;
 762   if (MsgHdr->MsgLen < sizeof(T_MsgHdr) + 1) {
 763     SG_LOG( SG_NETWORK, SG_ALERT, "FGMultiplayMgr::MP_ProcessData - "
 764             << "Chat message received with insufficient data" );
 765     return;
 766   }
 767
 768   char *MsgBuf = new char[MsgHdr->MsgLen - sizeof(T_MsgHdr)];
 769   strncpy(MsgBuf, ((T_ChatMsg *)(Msg + sizeof(T_MsgHdr)))->Text,
 770           MsgHdr->MsgLen - sizeof(T_MsgHdr));
 771   MsgBuf[MsgHdr->MsgLen - sizeof(T_MsgHdr) - 1] = '\0';
 772
 773   T_ChatMsg* ChatMsg = (T_ChatMsg *)(Msg + sizeof(T_MsgHdr));
 774   SG_LOG (SG_NETWORK, SG_ALERT, "Chat [" << MsgHdr->Callsign << "]"
 775            << " " << MsgBuf);
 776
 777   delete [] MsgBuf;
 778 } // FGMultiplayMgr::ProcessChatMsg ()
 779 //////////////////////////////////////////////////////////////////////
 780
 781 void
 782 FGMultiplayMgr::FillMsgHdr(T_MsgHdr *MsgHdr, int MsgId, unsigned _len)
 783 {
 784   uint32_t len;
 785   switch (MsgId) {
 786   case CHAT_MSG_ID:
 787     len = sizeof(T_MsgHdr) + sizeof(T_ChatMsg);
 788     break;
 789   case POS_DATA_ID:
 790     len = _len;
 791     break;
 792   default:
 793     len = sizeof(T_MsgHdr);
 794     break;
 795   }
 796   MsgHdr->Magic           = XDR_encode_uint32(MSG_MAGIC);
 797   MsgHdr->Version         = XDR_encode_uint32(PROTO_VER);
 798   MsgHdr->MsgId           = XDR_encode_uint32(MsgId);
 799   MsgHdr->MsgLen          = XDR_encode_uint32(len);
 800   MsgHdr->ReplyAddress    = 0; // Are obsolete, keep them for the server for
 801   MsgHdr->ReplyPort       = 0; // now
 802   strncpy(MsgHdr->Callsign, mCallsign.c_str(), MAX_CALLSIGN_LEN);
 803   MsgHdr->Callsign[MAX_CALLSIGN_LEN - 1] = '\0';
 804 }
 805
 806 FGAIMultiplayer*
 807 FGMultiplayMgr::addMultiplayer(const std::string& callsign,
 808                                const std::string& modelName)
 809 {
 810   if (0 < mMultiPlayerMap.count(callsign))
 811     return mMultiPlayerMap[callsign].get();
 812
 813   FGAIMultiplayer* mp = new FGAIMultiplayer;
 814   mp->setPath(modelName.c_str());
 815   mp->setCallSign(callsign);
 816   mMultiPlayerMap[callsign] = mp;
 817
 818   FGAIManager *aiMgr = (FGAIManager*)globals->get_subsystem("ai_model");
 819   if (aiMgr) {
 820     aiMgr->attach(mp);
 821
 822     /// FIXME: that must follow the attach ATM ...
 823     unsigned i = 0;
 824     while (sIdPropertyList[i].name) {
 825       mp->addPropertyId(sIdPropertyList[i].id, sIdPropertyList[i].name);
 826       ++i;
 827     }
 828   }
 829
 830   return mp;
 831 }
 832
 833 FGAIMultiplayer*
 834 FGMultiplayMgr::getMultiplayer(const std::string& callsign)
 835 {
 836   if (0 < mMultiPlayerMap.count(callsign))
 837     return mMultiPlayerMap[callsign].get();
 838   else
 839     return 0;
 840 }