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   {10100, "sim/multiplay/generic/string[0]", SGPropertyNode::STRING},
 156   {10101, "sim/multiplay/generic/string[1]", SGPropertyNode::STRING},
 157   {10102, "sim/multiplay/generic/string[2]", SGPropertyNode::STRING},
 158   {10103, "sim/multiplay/generic/string[3]", SGPropertyNode::STRING},
 159   {10104, "sim/multiplay/generic/string[4]", SGPropertyNode::STRING},
 160   {10105, "sim/multiplay/generic/string[5]", SGPropertyNode::STRING},
 161   {10106, "sim/multiplay/generic/string[6]", SGPropertyNode::STRING},
 162   {10107, "sim/multiplay/generic/string[7]", SGPropertyNode::STRING},
 163   {10108, "sim/multiplay/generic/string[8]", SGPropertyNode::STRING},
 164   {10109, "sim/multiplay/generic/string[9]", SGPropertyNode::STRING},
 165
 166   {10200, "sim/multiplay/generic/float[0]", SGPropertyNode::FLOAT},
 167   {10201, "sim/multiplay/generic/float[1]", SGPropertyNode::FLOAT},
 168   {10202, "sim/multiplay/generic/float[2]", SGPropertyNode::FLOAT},
 169   {10203, "sim/multiplay/generic/float[3]", SGPropertyNode::FLOAT},
 170   {10204, "sim/multiplay/generic/float[4]", SGPropertyNode::FLOAT},
 171   {10205, "sim/multiplay/generic/float[5]", SGPropertyNode::FLOAT},
 172   {10206, "sim/multiplay/generic/float[6]", SGPropertyNode::FLOAT},
 173   {10207, "sim/multiplay/generic/float[7]", SGPropertyNode::FLOAT},
 174   {10208, "sim/multiplay/generic/float[8]", SGPropertyNode::FLOAT},
 175   {10209, "sim/multiplay/generic/float[9]", SGPropertyNode::FLOAT},
 176
 177   {10300, "sim/multiplay/generic/int[0]", SGPropertyNode::INT},
 178   {10301, "sim/multiplay/generic/int[1]", SGPropertyNode::INT},
 179   {10302, "sim/multiplay/generic/int[2]", SGPropertyNode::INT},
 180   {10303, "sim/multiplay/generic/int[3]", SGPropertyNode::INT},
 181   {10304, "sim/multiplay/generic/int[4]", SGPropertyNode::INT},
 182   {10305, "sim/multiplay/generic/int[5]", SGPropertyNode::INT},
 183   {10306, "sim/multiplay/generic/int[6]", SGPropertyNode::INT},
 184   {10307, "sim/multiplay/generic/int[7]", SGPropertyNode::INT},
 185   {10308, "sim/multiplay/generic/int[8]", SGPropertyNode::INT},
 186   {10309, "sim/multiplay/generic/int[9]", SGPropertyNode::INT},
 187
 188   /// termination
 189   {0, 0, SGPropertyNode::UNSPECIFIED}
 190 };
 191
 192 //////////////////////////////////////////////////////////////////////
 193 //
 194 //  MultiplayMgr constructor
 195 //
 196 //////////////////////////////////////////////////////////////////////
 197 FGMultiplayMgr::FGMultiplayMgr()
 198 {
 199   mSocket        = 0;
 200   mInitialised   = false;
 201   mHaveServer    = false;
 202 } // FGMultiplayMgr::FGMultiplayMgr()
 203 //////////////////////////////////////////////////////////////////////
 204
 205 //////////////////////////////////////////////////////////////////////
 206 //
 207 //  MultiplayMgr destructor
 208 //
 209 //////////////////////////////////////////////////////////////////////
 210 FGMultiplayMgr::~FGMultiplayMgr()
 211 {
 212   Close();
 213 } // FGMultiplayMgr::~FGMultiplayMgr()
 214 //////////////////////////////////////////////////////////////////////
 215
 216 //////////////////////////////////////////////////////////////////////
 217 //
 218 //  Initialise object
 219 //
 220 //////////////////////////////////////////////////////////////////////
 221 bool
 222 FGMultiplayMgr::init (void)
 223 {
 224   //////////////////////////////////////////////////
 225   //  Initialise object if not already done
 226   //////////////////////////////////////////////////
 227   if (mInitialised) {
 228     SG_LOG(SG_NETWORK, SG_WARN, "FGMultiplayMgr::init - already initialised");
 229     return false;
 230   }
 231   //////////////////////////////////////////////////
 232   //  Set members from property values
 233   //////////////////////////////////////////////////
 234   short rxPort = fgGetInt("/sim/multiplay/rxport");
 235   if (rxPort <= 0)
 236     rxPort = 5000;
 237   mCallsign = fgGetString("/sim/multiplay/callsign");
 238   if (mCallsign.empty())
 239     // FIXME: use getpwuid
 240     mCallsign = "JohnDoe";
 241   string rxAddress = fgGetString("/sim/multiplay/rxhost");
 242   if (rxAddress.empty())
 243     rxAddress = "127.0.0.1";
 244   short txPort = fgGetInt("/sim/multiplay/txport");
 245   string txAddress = fgGetString("/sim/multiplay/txhost");
 246   if (txPort > 0 && !txAddress.empty()) {
 247     mHaveServer = true;
 248     mServer.set(txAddress.c_str(), txPort);
 249   }
 250   SG_LOG(SG_NETWORK,SG_INFO,"FGMultiplayMgr::init-txaddress= "<<txAddress);
 251   SG_LOG(SG_NETWORK,SG_INFO,"FGMultiplayMgr::init-txport= "<<txPort );
 252   SG_LOG(SG_NETWORK,SG_INFO,"FGMultiplayMgr::init-rxaddress="<<rxAddress );
 253   SG_LOG(SG_NETWORK,SG_INFO,"FGMultiplayMgr::init-rxport= "<<rxPort);
 254   SG_LOG(SG_NETWORK,SG_INFO,"FGMultiplayMgr::init-callsign= "<<mCallsign);
 255   Close(); // Should Init be called twice, close Socket first
 256            // A memory leak was reported here by valgrind
 257   mSocket = new netSocket();
 258   if (!mSocket->open(false)) {
 259     SG_LOG( SG_NETWORK, SG_ALERT,
 260             "FGMultiplayMgr::init - Failed to create data socket" );
 261     return false;
 262   }
 263   mSocket->setBlocking(false);
 264   if (mSocket->bind(rxAddress.c_str(), rxPort) != 0) {
 265     perror("bind");
 266     SG_LOG( SG_NETWORK, SG_ALERT,
 267             "FGMultiplayMgr::Open - Failed to bind receive socket" );
 268     return false;
 269   }
 270   mInitialised = true;
 271   return true;
 272 } // FGMultiplayMgr::init()
 273 //////////////////////////////////////////////////////////////////////
 274
 275 //////////////////////////////////////////////////////////////////////
 276 //
 277 //  Closes and deletes the local player object. Closes
 278 //  and deletes the tx socket. Resets the object state to unitialised.
 279 //
 280 //////////////////////////////////////////////////////////////////////
 281 void
 282 FGMultiplayMgr::Close (void)
 283 {
 284   mMultiPlayerMap.clear();
 285
 286   if (mSocket) {
 287     mSocket->close();
 288     delete mSocket;
 289     mSocket = 0;
 290   }
 291   mInitialised = false;
 292 } // FGMultiplayMgr::Close(void)
 293 //////////////////////////////////////////////////////////////////////
 294
 295 //////////////////////////////////////////////////////////////////////
 296 //
 297 //  Description: Sends the position data for the local position.
 298 //
 299 //////////////////////////////////////////////////////////////////////
 300 void
 301 FGMultiplayMgr::SendMyPosition(const FGExternalMotionData& motionInfo)
 302 {
 303   if ((! mInitialised) || (! mHaveServer)) {
 304     if (! mInitialised)
 305       SG_LOG( SG_NETWORK, SG_ALERT,
 306               "FGMultiplayMgr::SendMyPosition - not initialised" );
 307     if (! mHaveServer)
 308       SG_LOG( SG_NETWORK, SG_ALERT,
 309               "FGMultiplayMgr::SendMyPosition - no server" );
 310     return;
 311   }
 312
 313   T_PositionMsg PosMsg;
 314   strncpy(PosMsg.Model, fgGetString("/sim/model/path"), MAX_MODEL_NAME_LEN);
 315   PosMsg.Model[MAX_MODEL_NAME_LEN - 1] = '\0';
 316
 317   PosMsg.time = XDR_encode_double (motionInfo.time);
 318   PosMsg.lag = XDR_encode_double (motionInfo.lag);
 319   for (unsigned i = 0 ; i < 3; ++i)
 320     PosMsg.position[i] = XDR_encode_double (motionInfo.position(i));
 321   SGVec3f angleAxis;
 322   motionInfo.orientation.getAngleAxis(angleAxis);
 323   for (unsigned i = 0 ; i < 3; ++i)
 324     PosMsg.orientation[i] = XDR_encode_float (angleAxis(i));
 325   for (unsigned i = 0 ; i < 3; ++i)
 326     PosMsg.linearVel[i] = XDR_encode_float (motionInfo.linearVel(i));
 327   for (unsigned i = 0 ; i < 3; ++i)
 328     PosMsg.angularVel[i] = XDR_encode_float (motionInfo.angularVel(i));
 329   for (unsigned i = 0 ; i < 3; ++i)
 330     PosMsg.linearAccel[i] = XDR_encode_float (motionInfo.linearAccel(i));
 331   for (unsigned i = 0 ; i < 3; ++i)
 332     PosMsg.angularAccel[i] = XDR_encode_float (motionInfo.angularAccel(i));
 333
 334   char Msg[MAX_PACKET_SIZE];
 335   memcpy(Msg + sizeof(T_MsgHdr), &PosMsg, sizeof(T_PositionMsg));
 336
 337   char* ptr = Msg + sizeof(T_MsgHdr) + sizeof(T_PositionMsg);
 338   std::vector<FGPropertyData*>::const_iterator it;
 339   it = motionInfo.properties.begin();
 340   //cout << "OUTPUT PROPERTIES\n";
 341   while (it != motionInfo.properties.end()
 342          && ptr + 2 * sizeof(xdr_data_t) < (Msg + MAX_PACKET_SIZE)) {
 343
 344     // First elements is the ID
 345     xdr_data_t xdr = XDR_encode_uint32((*it)->id);
 346     memcpy(ptr, &xdr, sizeof(xdr_data_t));
 347     ptr += sizeof(xdr_data_t);
 348
 349     // The actual data representation depends on the type
 350     switch ((*it)->type) {
 351       case SGPropertyNode::INT:
 352       case SGPropertyNode::BOOL:
 353       case SGPropertyNode::LONG:
 354         xdr = XDR_encode_uint32((*it)->int_value);
 355         memcpy(ptr, &xdr, sizeof(xdr_data_t));
 356         ptr += sizeof(xdr_data_t);
 357         //cout << "Prop:" << (*it)->id << " " << (*it)->type << " "<< (*it)->int_value << "\n";
 358         break;
 359       case SGPropertyNode::FLOAT:
 360       case SGPropertyNode::DOUBLE:
 361         xdr = XDR_encode_float((*it)->float_value);;
 362         memcpy(ptr, &xdr, sizeof(xdr_data_t));
 363         ptr += sizeof(xdr_data_t);
 364         //cout << "Prop:" << (*it)->id << " " << (*it)->type << " "<< (*it)->float_value << "\n";
 365         break;
 366       case SGPropertyNode::STRING:
 367       case SGPropertyNode::UNSPECIFIED:
 368         {
 369           // String is complicated. It consists of
 370           // The length of the string
 371           // The string itself
 372           // Padding to the nearest 4-bytes.
 373           const char* lcharptr = (*it)->string_value;
 374
 375           if (lcharptr != 0)
 376           {
 377             // Add the length
 378             ////cout << "String length: " << strlen(lcharptr) << "\n";
 379             uint32_t len = strlen(lcharptr);
 380             // XXX This should not be using 4 bytes per character!
 381             if (ptr + (1 + len + (4 - len % 4)) * sizeof (xdr_data_t)
 382                 >= (Msg + MAX_PACKET_SIZE))
 383                 goto escape;
 384             //cout << "String length unint32: " << len << "\n";
 385             xdr = XDR_encode_uint32(len);
 386             memcpy(ptr, &xdr, sizeof(xdr_data_t));
 387             ptr += sizeof(xdr_data_t);
 388
 389             if (len != 0)
 390             {
 391
 392               // Now the text itself
 393               // XXX This should not be using 4 bytes per character!
 394               int lcount = 0;
 395               while ((*lcharptr != '\0') && (lcount < MAX_TEXT_SIZE))
 396               {
 397                 xdr = XDR_encode_int8(*lcharptr);
 398                 memcpy(ptr, &xdr, sizeof(xdr_data_t));
 399                 ptr += sizeof(xdr_data_t);
 400                 lcharptr++;
 401                 lcount++;
 402               }
 403
 404               //cout << "Prop:" << (*it)->id << " " << (*it)->type << " " << len << " " << (*it)->string_value;
 405
 406               // Now pad if required
 407               while ((lcount % 4) != 0)
 408               {
 409                 xdr = XDR_encode_int8(0);
 410                 memcpy(ptr, &xdr, sizeof(xdr_data_t));
 411                 ptr += sizeof(xdr_data_t);
 412                 lcount++;
 413                 //cout << "0";
 414               }
 415
 416               //cout << "\n";
 417             }
 418           }
 419           else
 420           {
 421             // Nothing to encode
 422             xdr = XDR_encode_uint32(0);
 423             memcpy(ptr, &xdr, sizeof(xdr_data_t));
 424             ptr += sizeof(xdr_data_t);
 425             //cout << "Prop:" << (*it)->id << " " << (*it)->type << " 0\n";
 426           }
 427
 428         }
 429         break;
 430
 431       default:
 432         //cout << " Unknown Type: " << (*it)->type << "\n";
 433         xdr = XDR_encode_float((*it)->float_value);;
 434         memcpy(ptr, &xdr, sizeof(xdr_data_t));
 435         ptr += sizeof(xdr_data_t);
 436         //cout << "Prop:" << (*it)->id << " " << (*it)->type << " "<< (*it)->float_value << "\n";
 437         break;
 438     }
 439
 440     ++it;
 441   }
 442 escape:
 443
 444   T_MsgHdr MsgHdr;
 445   FillMsgHdr(&MsgHdr, POS_DATA_ID, ptr - Msg);
 446   memcpy(Msg, &MsgHdr, sizeof(T_MsgHdr));
 447
 448   mSocket->sendto(Msg, ptr - Msg, 0, &mServer);
 449   SG_LOG(SG_NETWORK, SG_DEBUG, "FGMultiplayMgr::SendMyPosition");
 450 } // FGMultiplayMgr::SendMyPosition()
 451 //////////////////////////////////////////////////////////////////////
 452
 453 //////////////////////////////////////////////////////////////////////
 454 //
 455 //  Name: SendTextMessage
 456 //  Description: Sends a message to the player. The message must
 457 //  contain a valid and correctly filled out header and optional
 458 //  message body.
 459 //
 460 //////////////////////////////////////////////////////////////////////
 461 void
 462 FGMultiplayMgr::SendTextMessage(const string &MsgText)
 463 {
 464   if (!mInitialised || !mHaveServer)
 465     return;
 466
 467   T_MsgHdr MsgHdr;
 468   FillMsgHdr(&MsgHdr, CHAT_MSG_ID);
 469   //////////////////////////////////////////////////
 470   // Divide the text string into blocks that fit
 471   // in the message and send the blocks.
 472   //////////////////////////////////////////////////
 473   unsigned iNextBlockPosition = 0;
 474   T_ChatMsg ChatMsg;
 475
 476   char Msg[sizeof(T_MsgHdr) + sizeof(T_ChatMsg)];
 477   while (iNextBlockPosition < MsgText.length()) {
 478     strncpy (ChatMsg.Text,
 479              MsgText.substr(iNextBlockPosition, MAX_CHAT_MSG_LEN - 1).c_str(),
 480              MAX_CHAT_MSG_LEN);
 481     ChatMsg.Text[MAX_CHAT_MSG_LEN - 1] = '\0';
 482     memcpy (Msg, &MsgHdr, sizeof(T_MsgHdr));
 483     memcpy (Msg + sizeof(T_MsgHdr), &ChatMsg, sizeof(T_ChatMsg));
 484     mSocket->sendto (Msg, sizeof(T_MsgHdr) + sizeof(T_ChatMsg), 0, &mServer);
 485     iNextBlockPosition += MAX_CHAT_MSG_LEN - 1;
 486
 487   }
 488
 489
 490 } // FGMultiplayMgr::SendTextMessage ()
 491 //////////////////////////////////////////////////////////////////////
 492
 493 //////////////////////////////////////////////////////////////////////
 494 //
 495 //  Name: ProcessData
 496 //  Description: Processes data waiting at the receive socket. The
 497 //  processing ends when there is no more data at the socket.
 498 //
 499 //////////////////////////////////////////////////////////////////////
 500 void
 501 FGMultiplayMgr::Update(void)
 502 {
 503   if (!mInitialised)
 504     return;
 505
 506   /// Just for expiry
 507   SGTimeStamp timestamper;
 508   timestamper.stamp();
 509   long stamp = timestamper.get_seconds();
 510
 511   //////////////////////////////////////////////////
 512   //  Read the receive socket and process any data
 513   //////////////////////////////////////////////////
 514   int bytes;
 515   do {
 516     char Msg[MAX_PACKET_SIZE];
 517     //////////////////////////////////////////////////
 518     //  Although the recv call asks for
 519     //  MAX_PACKET_SIZE of data, the number of bytes
 520     //  returned will only be that of the next
 521     //  packet waiting to be processed.
 522     //////////////////////////////////////////////////
 523     netAddress SenderAddress;
 524     bytes = mSocket->recvfrom(Msg, sizeof(Msg), 0, &SenderAddress);
 525     //////////////////////////////////////////////////
 526     //  no Data received
 527     //////////////////////////////////////////////////
 528     if (bytes <= 0) {
 529       if (errno != EAGAIN && errno != 0) // MSVC output "NoError" otherwise
 530         perror("FGMultiplayMgr::MP_ProcessData");
 531       break;
 532     }
 533     if (bytes <= sizeof(T_MsgHdr)) {
 534       SG_LOG( SG_NETWORK, SG_ALERT, "FGMultiplayMgr::MP_ProcessData - "
 535               << "received message with insufficient data" );
 536       break;
 537     }
 538     //////////////////////////////////////////////////
 539     //  Read header
 540     //////////////////////////////////////////////////
 541     T_MsgHdr* MsgHdr = (T_MsgHdr *)Msg;
 542     MsgHdr->Magic       = XDR_decode_uint32 (MsgHdr->Magic);
 543     MsgHdr->Version     = XDR_decode_uint32 (MsgHdr->Version);
 544     MsgHdr->MsgId       = XDR_decode_uint32 (MsgHdr->MsgId);
 545     MsgHdr->MsgLen      = XDR_decode_uint32 (MsgHdr->MsgLen);
 546     MsgHdr->ReplyPort   = XDR_decode_uint32 (MsgHdr->ReplyPort);
 547     if (MsgHdr->Magic != MSG_MAGIC) {
 548       SG_LOG( SG_NETWORK, SG_ALERT, "FGMultiplayMgr::MP_ProcessData - "
 549               << "message has invalid magic number!" );
 550       break;
 551     }
 552     if (MsgHdr->Version != PROTO_VER) {
 553       SG_LOG( SG_NETWORK, SG_ALERT, "FGMultiplayMgr::MP_ProcessData - "
 554               << "message has invalid protocoll number!" );
 555       break;
 556     }
 557     if (MsgHdr->MsgLen != bytes) {
 558       SG_LOG( SG_NETWORK, SG_ALERT, "FGMultiplayMgr::MP_ProcessData - "
 559               << "message has invalid length!" );
 560       break;
 561     }
 562     //////////////////////////////////////////////////
 563     //  Process messages
 564     //////////////////////////////////////////////////
 565     switch (MsgHdr->MsgId) {
 566     case CHAT_MSG_ID:
 567       ProcessChatMsg(Msg, SenderAddress);
 568       break;
 569     case POS_DATA_ID:
 570       ProcessPosMsg(Msg, SenderAddress, bytes, stamp);
 571       break;
 572     case UNUSABLE_POS_DATA_ID:
 573     case OLD_OLD_POS_DATA_ID:
 574     case OLD_PROP_MSG_ID:
 575     case OLD_POS_DATA_ID:
 576       break;
 577     default:
 578       SG_LOG( SG_NETWORK, SG_ALERT, "FGMultiplayMgr::MP_ProcessData - "
 579               << "Unknown message Id received: " << MsgHdr->MsgId );
 580       break;
 581     }
 582   } while (bytes > 0);
 583
 584   // check for expiry
 585   MultiPlayerMap::iterator it = mMultiPlayerMap.begin();
 586   while (it != mMultiPlayerMap.end()) {
 587     if (it->second->getLastTimestamp() + 10 < stamp) {
 588       std::string name = it->first;
 589       it->second->setDie(true);
 590       mMultiPlayerMap.erase(it);
 591       it = mMultiPlayerMap.upper_bound(name);
 592     } else
 593       ++it;
 594   }
 595 } // FGMultiplayMgr::ProcessData(void)
 596 //////////////////////////////////////////////////////////////////////
 597
 598 //////////////////////////////////////////////////////////////////////
 599 //
 600 //  handle a position message
 601 //
 602 //////////////////////////////////////////////////////////////////////
 603 void
 604 FGMultiplayMgr::ProcessPosMsg(const char *Msg, netAddress & SenderAddress,
 605                               unsigned len, long stamp)
 606 {
 607   T_MsgHdr* MsgHdr = (T_MsgHdr *)Msg;
 608   if (MsgHdr->MsgLen < sizeof(T_MsgHdr) + sizeof(T_PositionMsg)) {
 609     SG_LOG( SG_NETWORK, SG_ALERT, "FGMultiplayMgr::MP_ProcessData - "
 610             << "Position message received with insufficient data" );
 611     return;
 612   }
 613   T_PositionMsg* PosMsg = (T_PositionMsg *)(Msg + sizeof(T_MsgHdr));
 614   FGExternalMotionData motionInfo;
 615   motionInfo.time = XDR_decode_double(PosMsg->time);
 616   motionInfo.lag = XDR_decode_double(PosMsg->lag);
 617   for (unsigned i = 0; i < 3; ++i)
 618     motionInfo.position(i) = XDR_decode_double(PosMsg->position[i]);
 619   SGVec3f angleAxis;
 620   for (unsigned i = 0; i < 3; ++i)
 621     angleAxis(i) = XDR_decode_float(PosMsg->orientation[i]);
 622   motionInfo.orientation = SGQuatf::fromAngleAxis(angleAxis);
 623   for (unsigned i = 0; i < 3; ++i)
 624     motionInfo.linearVel(i) = XDR_decode_float(PosMsg->linearVel[i]);
 625   for (unsigned i = 0; i < 3; ++i)
 626     motionInfo.angularVel(i) = XDR_decode_float(PosMsg->angularVel[i]);
 627   for (unsigned i = 0; i < 3; ++i)
 628     motionInfo.linearAccel(i) = XDR_decode_float(PosMsg->linearAccel[i]);
 629   for (unsigned i = 0; i < 3; ++i)
 630     motionInfo.angularAccel(i) = XDR_decode_float(PosMsg->angularAccel[i]);
 631
 632
 633   //cout << "INPUT MESSAGE\n";
 634   xdr_data_t* xdr = (xdr_data_t*)
 635                    (Msg + sizeof(T_MsgHdr) + sizeof(T_PositionMsg));
 636   while ((char*)xdr < Msg + len) {
 637     FGPropertyData* pData = new FGPropertyData;
 638     SGPropertyNode::Type type = SGPropertyNode::UNSPECIFIED;
 639
 640     // First element is always the ID
 641     pData->id = XDR_decode_uint32(*xdr);
 642     //cout << pData->id << " ";
 643     xdr++;
 644
 645     // Check the ID actually exists and get the type
 646     unsigned i = 0;
 647     bool found = false;
 648     while (FGMultiplayMgr::sIdPropertyList[i].name)
 649     {
 650       if (sIdPropertyList[i].id == pData->id)
 651       {
 652         found = true;
 653         pData->type = sIdPropertyList[i].type;
 654       }
 655
 656       i++;
 657     }
 658
 659     if (found == true)
 660     {
 661       // How we decode the remainder of the property depends on the type
 662       switch (pData->type) {
 663         case SGPropertyNode::INT:
 664         case SGPropertyNode::BOOL:
 665         case SGPropertyNode::LONG:
 666           pData->int_value = XDR_decode_uint32(*xdr);
 667           xdr++;
 668           //cout << pData->int_value << "\n";
 669           break;
 670         case SGPropertyNode::FLOAT:
 671         case SGPropertyNode::DOUBLE:
 672           pData->float_value = XDR_decode_float(*xdr);
 673           xdr++;
 674           //cout << pData->float_value << "\n";
 675           break;
 676         case SGPropertyNode::STRING:
 677         case SGPropertyNode::UNSPECIFIED:
 678           {
 679             // String is complicated. It consists of
 680             // The length of the string
 681             // The string itself
 682             // Padding to the nearest 4-bytes.
 683             uint32_t length = XDR_decode_uint32(*xdr);
 684             xdr++;
 685             //cout << length << " ";
 686
 687             if ((length > 0) && (length < MAX_TEXT_SIZE))
 688             {
 689               pData->string_value = new char[length + 1];
 690               //cout << " String: ";
 691
 692               for (int i = 0; i < length; i++)
 693               {
 694                 pData->string_value[i] = (char) XDR_decode_int8(*xdr);
 695                 xdr++;
 696                 //cout << pData->string_value[i];
 697               }
 698
 699               pData->string_value[length] = '\0';
 700
 701               // Now handle the padding
 702               while ((length % 4) != 0)
 703               {
 704                 xdr++;
 705                 length++;
 706                 //cout << "0";
 707               }
 708             }
 709             else
 710             {
 711               pData->string_value = new char[1];
 712               pData->string_value[0] = '\0';
 713             }
 714
 715             //cout << "\n";
 716           }
 717           break;
 718
 719         default:
 720           pData->float_value = XDR_decode_float(*xdr);
 721           cerr << "Unknown Prop type " << pData->id << " " << pData->type << "\n";
 722           xdr++;
 723           break;
 724       }
 725
 726       motionInfo.properties.push_back(pData);
 727     }
 728     else
 729     {
 730       // We failed to find the property. We'll try the next packet immediately.
 731       //cout << " Unknown\n";
 732     }
 733   }
 734
 735   FGAIMultiplayer* mp = getMultiplayer(MsgHdr->Callsign);
 736   if (!mp)
 737     mp = addMultiplayer(MsgHdr->Callsign, PosMsg->Model);
 738   mp->addMotionInfo(motionInfo, stamp);
 739 } // FGMultiplayMgr::ProcessPosMsg()
 740 //////////////////////////////////////////////////////////////////////
 741
 742 //////////////////////////////////////////////////////////////////////
 743 //
 744 //  handle a chat message
 745 //  FIXME: display chat message withi flightgear
 746 //
 747 //////////////////////////////////////////////////////////////////////
 748 void
 749 FGMultiplayMgr::ProcessChatMsg(const char *Msg, netAddress& SenderAddress)
 750 {
 751   T_MsgHdr* MsgHdr = (T_MsgHdr *)Msg;
 752   if (MsgHdr->MsgLen < sizeof(T_MsgHdr) + 1) {
 753     SG_LOG( SG_NETWORK, SG_ALERT, "FGMultiplayMgr::MP_ProcessData - "
 754             << "Chat message received with insufficient data" );
 755     return;
 756   }
 757
 758   char *MsgBuf = new char[MsgHdr->MsgLen - sizeof(T_MsgHdr)];
 759   strncpy(MsgBuf, ((T_ChatMsg *)(Msg + sizeof(T_MsgHdr)))->Text,
 760           MsgHdr->MsgLen - sizeof(T_MsgHdr));
 761   MsgBuf[MsgHdr->MsgLen - sizeof(T_MsgHdr) - 1] = '\0';
 762
 763   T_ChatMsg* ChatMsg = (T_ChatMsg *)(Msg + sizeof(T_MsgHdr));
 764   SG_LOG ( SG_NETWORK, SG_ALERT, "Chat [" << MsgHdr->Callsign << "]"
 765            << " " << MsgBuf << endl);
 766
 767   delete [] MsgBuf;
 768 } // FGMultiplayMgr::ProcessChatMsg ()
 769 //////////////////////////////////////////////////////////////////////
 770
 771 void
 772 FGMultiplayMgr::FillMsgHdr(T_MsgHdr *MsgHdr, int MsgId, unsigned _len)
 773 {
 774   uint32_t len;
 775   switch (MsgId) {
 776   case CHAT_MSG_ID:
 777     len = sizeof(T_MsgHdr) + sizeof(T_ChatMsg);
 778     break;
 779   case POS_DATA_ID:
 780     len = _len;
 781     break;
 782   default:
 783     len = sizeof(T_MsgHdr);
 784     break;
 785   }
 786   MsgHdr->Magic           = XDR_encode_uint32(MSG_MAGIC);
 787   MsgHdr->Version         = XDR_encode_uint32(PROTO_VER);
 788   MsgHdr->MsgId           = XDR_encode_uint32(MsgId);
 789   MsgHdr->MsgLen          = XDR_encode_uint32(len);
 790   MsgHdr->ReplyAddress    = 0; // Are obsolete, keep them for the server for
 791   MsgHdr->ReplyPort       = 0; // now
 792   strncpy(MsgHdr->Callsign, mCallsign.c_str(), MAX_CALLSIGN_LEN);
 793   MsgHdr->Callsign[MAX_CALLSIGN_LEN - 1] = '\0';
 794 }
 795
 796 FGAIMultiplayer*
 797 FGMultiplayMgr::addMultiplayer(const std::string& callsign,
 798                                const std::string& modelName)
 799 {
 800   if (0 < mMultiPlayerMap.count(callsign))
 801     return mMultiPlayerMap[callsign];
 802
 803   FGAIMultiplayer* mp = new FGAIMultiplayer;
 804   mp->setPath(modelName.c_str());
 805   mp->setCallSign(callsign);
 806   mMultiPlayerMap[callsign] = mp;
 807
 808   FGAIManager *aiMgr = (FGAIManager*)globals->get_subsystem("ai_model");
 809   if (aiMgr) {
 810     aiMgr->attach(mp);
 811
 812     /// FIXME: that must follow the attach ATM ...
 813     unsigned i = 0;
 814     while (sIdPropertyList[i].name) {
 815       mp->addPropertyId(sIdPropertyList[i].id, sIdPropertyList[i].name);
 816       ++i;
 817     }
 818   }
 819
 820   return mp;
 821 }
 822
 823 FGAIMultiplayer*
 824 FGMultiplayMgr::getMultiplayer(const std::string& callsign)
 825 {
 826   if (0 < mMultiPlayerMap.count(callsign))
 827     return mMultiPlayerMap[callsign];
 828   else
 829     return 0;
 830 }