src/MultiPlayer/multiplaymgr.cxx

   1 //////////////////////////////////////////////////////////////////////
   2 //
   3 // multiplaymgr.hpp
   4 //
   5 // Written by Duncan McCreanor, started February 2003.
   6 // duncan.mccreanor@airservicesaustralia.com
   7 //
   8 // Copyright (C) 2003  Airservices Australia
   9 // Copyright (C) 2005  Oliver Schroeder
  10 // Copyright (C) 2006  Mathias Froehlich
  11 //
  12 // This program is free software; you can redistribute it and/or
  13 // modify it under the terms of the GNU General Public License as
  14 // published by the Free Software Foundation; either version 2 of the
  15 // License, or (at your option) any later version.
  16 //
  17 // This program is distributed in the hope that it will be useful, but
  18 // WITHOUT ANY WARRANTY; without even the implied warranty of
  19 // MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  20 // General Public License for more details.
  21 //
  22 // You should have received a copy of the GNU General Public License
  23 // along with this program; if not, write to the Free Software
  24 // Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301, USA.
  25 //
  26 // $Id$
  27 //
  28 //////////////////////////////////////////////////////////////////////
  29
  30 #ifdef HAVE_CONFIG_H
  31 #include <config.h>
  32 #endif
  33
  34 #include <plib/netSocket.h>
  35
  36 #include <simgear/misc/stdint.hxx>
  37 #include <simgear/timing/timestamp.hxx>
  38 #include <simgear/debug/logstream.hxx>
  39 #include <simgear/props/props.hxx>
  40
  41 #include <AIModel/AIManager.hxx>
  42 #include <Main/fg_props.hxx>
  43 #include "multiplaymgr.hxx"
  44 #include "mpmessages.hxx"
  45
  46 #define MAX_PACKET_SIZE 1200
  47 #define MAX_TEXT_SIZE 128
  48
  49 // These constants are provided so that the ident
  50 // command can list file versions
  51 const char sMULTIPLAYMGR_BID[] = "$Id$";
  52 const char sMULTIPLAYMGR_HID[] = MULTIPLAYTXMGR_HID;
  53
  54 // A static map of protocol property id values to property paths,
  55 // This should be extendable dynamically for every specific aircraft ...
  56 // For now only that static list
  57 FGMultiplayMgr::IdPropertyList
  58 FGMultiplayMgr::sIdPropertyList[] = {
  59   {100, "surface-positions/left-aileron-pos-norm",  SGPropertyNode::FLOAT},
  60   {101, "surface-positions/right-aileron-pos-norm", SGPropertyNode::FLOAT},
  61   {102, "surface-positions/elevator-pos-norm",      SGPropertyNode::FLOAT},
  62   {103, "surface-positions/rudder-pos-norm",        SGPropertyNode::FLOAT},
  63   {104, "surface-positions/flap-pos-norm",          SGPropertyNode::FLOAT},
  64   {105, "surface-positions/speedbrake-pos-norm",    SGPropertyNode::FLOAT},
  65   {106, "gear/tailhook/position-norm",              SGPropertyNode::FLOAT},
  66   {107, "gear/launchbar/position-norm",             SGPropertyNode::FLOAT},
  67   {108, "gear/launchbar/state",                     SGPropertyNode::STRING},
  68   {109, "gear/launchbar/holdback-position-norm",    SGPropertyNode::FLOAT},
  69   {110, "canopy/position-norm",                     SGPropertyNode::FLOAT},
  70
  71   {200, "gear/gear[0]/compression-norm",           SGPropertyNode::FLOAT},
  72   {201, "gear/gear[0]/position-norm",              SGPropertyNode::FLOAT},
  73   {210, "gear/gear[1]/compression-norm",           SGPropertyNode::FLOAT},
  74   {211, "gear/gear[1]/position-norm",              SGPropertyNode::FLOAT},
  75   {220, "gear/gear[2]/compression-norm",           SGPropertyNode::FLOAT},
  76   {221, "gear/gear[2]/position-norm",              SGPropertyNode::FLOAT},
  77   {230, "gear/gear[3]/compression-norm",           SGPropertyNode::FLOAT},
  78   {231, "gear/gear[3]/position-norm",              SGPropertyNode::FLOAT},
  79   {240, "gear/gear[4]/compression-norm",           SGPropertyNode::FLOAT},
  80   {241, "gear/gear[4]/position-norm",              SGPropertyNode::FLOAT},
  81
  82   {300, "engines/engine[0]/n1",  SGPropertyNode::FLOAT},
  83   {301, "engines/engine[0]/n2",  SGPropertyNode::FLOAT},
  84   {302, "engines/engine[0]/rpm", SGPropertyNode::FLOAT},
  85   {310, "engines/engine[1]/n1",  SGPropertyNode::FLOAT},
  86   {311, "engines/engine[1]/n2",  SGPropertyNode::FLOAT},
  87   {312, "engines/engine[1]/rpm", SGPropertyNode::FLOAT},
  88   {320, "engines/engine[2]/n1",  SGPropertyNode::FLOAT},
  89   {321, "engines/engine[2]/n2",  SGPropertyNode::FLOAT},
  90   {322, "engines/engine[2]/rpm", SGPropertyNode::FLOAT},
  91   {330, "engines/engine[3]/n1",  SGPropertyNode::FLOAT},
  92   {331, "engines/engine[3]/n2",  SGPropertyNode::FLOAT},
  93   {332, "engines/engine[3]/rpm", SGPropertyNode::FLOAT},
  94   {340, "engines/engine[4]/n1",  SGPropertyNode::FLOAT},
  95   {341, "engines/engine[4]/n2",  SGPropertyNode::FLOAT},
  96   {342, "engines/engine[4]/rpm", SGPropertyNode::FLOAT},
  97   {350, "engines/engine[5]/n1",  SGPropertyNode::FLOAT},
  98   {351, "engines/engine[5]/n2",  SGPropertyNode::FLOAT},
  99   {352, "engines/engine[5]/rpm", SGPropertyNode::FLOAT},
 100   {360, "engines/engine[6]/n1",  SGPropertyNode::FLOAT},
 101   {361, "engines/engine[6]/n2",  SGPropertyNode::FLOAT},
 102   {362, "engines/engine[6]/rpm", SGPropertyNode::FLOAT},
 103   {370, "engines/engine[7]/n1",  SGPropertyNode::FLOAT},
 104   {371, "engines/engine[7]/n2",  SGPropertyNode::FLOAT},
 105   {372, "engines/engine[7]/rpm", SGPropertyNode::FLOAT},
 106   {380, "engines/engine[8]/n1",  SGPropertyNode::FLOAT},
 107   {381, "engines/engine[8]/n2",  SGPropertyNode::FLOAT},
 108   {382, "engines/engine[8]/rpm", SGPropertyNode::FLOAT},
 109   {390, "engines/engine[9]/n1",  SGPropertyNode::FLOAT},
 110   {391, "engines/engine[9]/n2",  SGPropertyNode::FLOAT},
 111   {392, "engines/engine[9]/rpm", SGPropertyNode::FLOAT},
 112
 113   {800, "rotors/main/rpm", SGPropertyNode::FLOAT},
 114   {801, "rotors/tail/rpm", SGPropertyNode::FLOAT},
 115   {810, "rotors/main/blade[0]/position-deg",  SGPropertyNode::FLOAT},
 116   {811, "rotors/main/blade[1]/position-deg",  SGPropertyNode::FLOAT},
 117   {812, "rotors/main/blade[2]/position-deg",  SGPropertyNode::FLOAT},
 118   {813, "rotors/main/blade[3]/position-deg",  SGPropertyNode::FLOAT},
 119   {820, "rotors/main/blade[0]/flap-deg",  SGPropertyNode::FLOAT},
 120   {821, "rotors/main/blade[1]/flap-deg",  SGPropertyNode::FLOAT},
 121   {822, "rotors/main/blade[2]/flap-deg",  SGPropertyNode::FLOAT},
 122   {823, "rotors/main/blade[3]/flap-deg",  SGPropertyNode::FLOAT},
 123   {830, "rotors/tail/blade[0]/position-deg",  SGPropertyNode::FLOAT},
 124   {831, "rotors/tail/blade[1]/position-deg",  SGPropertyNode::FLOAT},
 125
 126   {900, "sim/hitches/aerotow/tow/length",                       SGPropertyNode::FLOAT},
 127   {901, "sim/hitches/aerotow/tow/elastic-constant",             SGPropertyNode::FLOAT},
 128   {902, "sim/hitches/aerotow/tow/weight-per-m-kg-m",            SGPropertyNode::FLOAT},
 129   {903, "sim/hitches/aerotow/tow/dist",                         SGPropertyNode::FLOAT},
 130   {904, "sim/hitches/aerotow/tow/connected-to-property-node",   SGPropertyNode::BOOL},
 131   {905, "sim/hitches/aerotow/tow/connected-to-ai-or-mp-callsign",   SGPropertyNode::STRING},
 132   {906, "sim/hitches/aerotow/tow/brake-force",                  SGPropertyNode::FLOAT},
 133   {907, "sim/hitches/aerotow/tow/end-force-x",                  SGPropertyNode::FLOAT},
 134   {908, "sim/hitches/aerotow/tow/end-force-y",                  SGPropertyNode::FLOAT},
 135   {909, "sim/hitches/aerotow/tow/end-force-z",                  SGPropertyNode::FLOAT},
 136   {930, "sim/hitches/aerotow/is-slave",                         SGPropertyNode::BOOL},
 137   {931, "sim/hitches/aerotow/speed-in-tow-direction",           SGPropertyNode::FLOAT},
 138   {932, "sim/hitches/aerotow/open",                             SGPropertyNode::BOOL},
 139   {933, "sim/hitches/aerotow/local-pos-x",                      SGPropertyNode::FLOAT},
 140   {934, "sim/hitches/aerotow/local-pos-y",                      SGPropertyNode::FLOAT},
 141   {935, "sim/hitches/aerotow/local-pos-z",                      SGPropertyNode::FLOAT},
 142
 143   {1001, "controls/flight/slats",  SGPropertyNode::FLOAT},
 144   {1002, "controls/flight/speedbrake",  SGPropertyNode::FLOAT},
 145   {1003, "controls/flight/spoilers",  SGPropertyNode::FLOAT},
 146   {1004, "controls/gear/gear-down",  SGPropertyNode::FLOAT},
 147   {1005, "controls/lighting/nav-lights",  SGPropertyNode::FLOAT},
 148   {1006, "controls/armament/station[0]/jettison-all",  SGPropertyNode::BOOL},
 149
 150   {1100, "sim/model/variant", SGPropertyNode::INT},
 151   {1101, "sim/model/livery/file", SGPropertyNode::STRING},
 152
 153   {10001, "sim/multiplay/transmission-freq-hz",  SGPropertyNode::STRING},
 154   {10002, "sim/multiplay/chat",  SGPropertyNode::STRING},
 155
 156   {10100, "sim/multiplay/generic/string[0]", SGPropertyNode::STRING},
 157   {10101, "sim/multiplay/generic/string[1]", SGPropertyNode::STRING},
 158   {10102, "sim/multiplay/generic/string[2]", SGPropertyNode::STRING},
 159   {10103, "sim/multiplay/generic/string[3]", SGPropertyNode::STRING},
 160   {10104, "sim/multiplay/generic/string[4]", SGPropertyNode::STRING},
 161   {10105, "sim/multiplay/generic/string[5]", SGPropertyNode::STRING},
 162   {10106, "sim/multiplay/generic/string[6]", SGPropertyNode::STRING},
 163   {10107, "sim/multiplay/generic/string[7]", SGPropertyNode::STRING},
 164   {10108, "sim/multiplay/generic/string[8]", SGPropertyNode::STRING},
 165   {10109, "sim/multiplay/generic/string[9]", SGPropertyNode::STRING},
 166
 167   {10200, "sim/multiplay/generic/float[0]", SGPropertyNode::FLOAT},
 168   {10201, "sim/multiplay/generic/float[1]", SGPropertyNode::FLOAT},
 169   {10202, "sim/multiplay/generic/float[2]", SGPropertyNode::FLOAT},
 170   {10203, "sim/multiplay/generic/float[3]", SGPropertyNode::FLOAT},
 171   {10204, "sim/multiplay/generic/float[4]", SGPropertyNode::FLOAT},
 172   {10205, "sim/multiplay/generic/float[5]", SGPropertyNode::FLOAT},
 173   {10206, "sim/multiplay/generic/float[6]", SGPropertyNode::FLOAT},
 174   {10207, "sim/multiplay/generic/float[7]", SGPropertyNode::FLOAT},
 175   {10208, "sim/multiplay/generic/float[8]", SGPropertyNode::FLOAT},
 176   {10209, "sim/multiplay/generic/float[9]", SGPropertyNode::FLOAT},
 177
 178   {10300, "sim/multiplay/generic/int[0]", SGPropertyNode::INT},
 179   {10301, "sim/multiplay/generic/int[1]", SGPropertyNode::INT},
 180   {10302, "sim/multiplay/generic/int[2]", SGPropertyNode::INT},
 181   {10303, "sim/multiplay/generic/int[3]", SGPropertyNode::INT},
 182   {10304, "sim/multiplay/generic/int[4]", SGPropertyNode::INT},
 183   {10305, "sim/multiplay/generic/int[5]", SGPropertyNode::INT},
 184   {10306, "sim/multiplay/generic/int[6]", SGPropertyNode::INT},
 185   {10307, "sim/multiplay/generic/int[7]", SGPropertyNode::INT},
 186   {10308, "sim/multiplay/generic/int[8]", SGPropertyNode::INT},
 187   {10309, "sim/multiplay/generic/int[9]", SGPropertyNode::INT},
 188
 189   /// termination
 190   {0, 0, SGPropertyNode::UNSPECIFIED}
 191 };
 192
 193 //////////////////////////////////////////////////////////////////////
 194 //
 195 //  MultiplayMgr constructor
 196 //
 197 //////////////////////////////////////////////////////////////////////
 198 FGMultiplayMgr::FGMultiplayMgr()
 199 {
 200   mSocket        = 0;
 201   mInitialised   = false;
 202   mHaveServer    = false;
 203 } // FGMultiplayMgr::FGMultiplayMgr()
 204 //////////////////////////////////////////////////////////////////////
 205
 206 //////////////////////////////////////////////////////////////////////
 207 //
 208 //  MultiplayMgr destructor
 209 //
 210 //////////////////////////////////////////////////////////////////////
 211 FGMultiplayMgr::~FGMultiplayMgr()
 212 {
 213   Close();
 214 } // FGMultiplayMgr::~FGMultiplayMgr()
 215 //////////////////////////////////////////////////////////////////////
 216
 217 //////////////////////////////////////////////////////////////////////
 218 //
 219 //  Initialise object
 220 //
 221 //////////////////////////////////////////////////////////////////////
 222 bool
 223 FGMultiplayMgr::init (void)
 224 {
 225   //////////////////////////////////////////////////
 226   //  Initialise object if not already done
 227   //////////////////////////////////////////////////
 228   if (mInitialised) {
 229     SG_LOG(SG_NETWORK, SG_WARN, "FGMultiplayMgr::init - already initialised");
 230     return false;
 231   }
 232   //////////////////////////////////////////////////
 233   //  Set members from property values
 234   //////////////////////////////////////////////////
 235   short rxPort = fgGetInt("/sim/multiplay/rxport");
 236   if (rxPort <= 0)
 237     rxPort = 5000;
 238   mCallsign = fgGetString("/sim/multiplay/callsign");
 239   if (mCallsign.empty())
 240     // FIXME: use getpwuid
 241     mCallsign = "JohnDoe";
 242   string rxAddress = fgGetString("/sim/multiplay/rxhost");
 243   if (rxAddress.empty())
 244     rxAddress = "127.0.0.1";
 245   short txPort = fgGetInt("/sim/multiplay/txport");
 246   string txAddress = fgGetString("/sim/multiplay/txhost");
 247   if (txPort > 0 && !txAddress.empty()) {
 248     mHaveServer = true;
 249     mServer.set(txAddress.c_str(), txPort);
 250   }
 251   SG_LOG(SG_NETWORK,SG_INFO,"FGMultiplayMgr::init-txaddress= "<<txAddress);
 252   SG_LOG(SG_NETWORK,SG_INFO,"FGMultiplayMgr::init-txport= "<<txPort );
 253   SG_LOG(SG_NETWORK,SG_INFO,"FGMultiplayMgr::init-rxaddress="<<rxAddress );
 254   SG_LOG(SG_NETWORK,SG_INFO,"FGMultiplayMgr::init-rxport= "<<rxPort);
 255   SG_LOG(SG_NETWORK,SG_INFO,"FGMultiplayMgr::init-callsign= "<<mCallsign);
 256   Close(); // Should Init be called twice, close Socket first
 257            // A memory leak was reported here by valgrind
 258   mSocket = new netSocket();
 259   if (!mSocket->open(false)) {
 260     SG_LOG( SG_NETWORK, SG_ALERT,
 261             "FGMultiplayMgr::init - Failed to create data socket" );
 262     return false;
 263   }
 264   mSocket->setBlocking(false);
 265   if (mSocket->bind(rxAddress.c_str(), rxPort) != 0) {
 266     perror("bind");
 267     SG_LOG( SG_NETWORK, SG_ALERT,
 268             "FGMultiplayMgr::Open - Failed to bind receive socket" );
 269     return false;
 270   }
 271   mInitialised = true;
 272   return true;
 273 } // FGMultiplayMgr::init()
 274 //////////////////////////////////////////////////////////////////////
 275
 276 //////////////////////////////////////////////////////////////////////
 277 //
 278 //  Closes and deletes the local player object. Closes
 279 //  and deletes the tx socket. Resets the object state to unitialised.
 280 //
 281 //////////////////////////////////////////////////////////////////////
 282 void
 283 FGMultiplayMgr::Close (void)
 284 {
 285   mMultiPlayerMap.clear();
 286
 287   if (mSocket) {
 288     mSocket->close();
 289     delete mSocket;
 290     mSocket = 0;
 291   }
 292   mInitialised = false;
 293 } // FGMultiplayMgr::Close(void)
 294 //////////////////////////////////////////////////////////////////////
 295
 296 //////////////////////////////////////////////////////////////////////
 297 //
 298 //  Description: Sends the position data for the local position.
 299 //
 300 //////////////////////////////////////////////////////////////////////
 301 void
 302 FGMultiplayMgr::SendMyPosition(const FGExternalMotionData& motionInfo)
 303 {
 304   if ((! mInitialised) || (! mHaveServer)) {
 305     if (! mInitialised)
 306       SG_LOG( SG_NETWORK, SG_ALERT,
 307               "FGMultiplayMgr::SendMyPosition - not initialised" );
 308     if (! mHaveServer)
 309       SG_LOG( SG_NETWORK, SG_ALERT,
 310               "FGMultiplayMgr::SendMyPosition - no server" );
 311     return;
 312   }
 313
 314   T_PositionMsg PosMsg;
 315   strncpy(PosMsg.Model, fgGetString("/sim/model/path"), MAX_MODEL_NAME_LEN);
 316   PosMsg.Model[MAX_MODEL_NAME_LEN - 1] = '\0';
 317
 318   PosMsg.time = XDR_encode_double (motionInfo.time);
 319   PosMsg.lag = XDR_encode_double (motionInfo.lag);
 320   for (unsigned i = 0 ; i < 3; ++i)
 321     PosMsg.position[i] = XDR_encode_double (motionInfo.position(i));
 322   SGVec3f angleAxis;
 323   motionInfo.orientation.getAngleAxis(angleAxis);
 324   for (unsigned i = 0 ; i < 3; ++i)
 325     PosMsg.orientation[i] = XDR_encode_float (angleAxis(i));
 326   for (unsigned i = 0 ; i < 3; ++i)
 327     PosMsg.linearVel[i] = XDR_encode_float (motionInfo.linearVel(i));
 328   for (unsigned i = 0 ; i < 3; ++i)
 329     PosMsg.angularVel[i] = XDR_encode_float (motionInfo.angularVel(i));
 330   for (unsigned i = 0 ; i < 3; ++i)
 331     PosMsg.linearAccel[i] = XDR_encode_float (motionInfo.linearAccel(i));
 332   for (unsigned i = 0 ; i < 3; ++i)
 333     PosMsg.angularAccel[i] = XDR_encode_float (motionInfo.angularAccel(i));
 334
 335   char Msg[MAX_PACKET_SIZE];
 336   memcpy(Msg + sizeof(T_MsgHdr), &PosMsg, sizeof(T_PositionMsg));
 337
 338   char* ptr = Msg + sizeof(T_MsgHdr) + sizeof(T_PositionMsg);
 339   std::vector<FGPropertyData*>::const_iterator it;
 340   it = motionInfo.properties.begin();
 341   //cout << "OUTPUT PROPERTIES\n";
 342   while (it != motionInfo.properties.end()
 343          && ptr + 2 * sizeof(xdr_data_t) < (Msg + MAX_PACKET_SIZE)) {
 344
 345     // First elements is the ID
 346     xdr_data_t xdr = XDR_encode_uint32((*it)->id);
 347     memcpy(ptr, &xdr, sizeof(xdr_data_t));
 348     ptr += sizeof(xdr_data_t);
 349
 350     // The actual data representation depends on the type
 351     switch ((*it)->type) {
 352       case SGPropertyNode::INT:
 353       case SGPropertyNode::BOOL:
 354       case SGPropertyNode::LONG:
 355         xdr = XDR_encode_uint32((*it)->int_value);
 356         memcpy(ptr, &xdr, sizeof(xdr_data_t));
 357         ptr += sizeof(xdr_data_t);
 358         //cout << "Prop:" << (*it)->id << " " << (*it)->type << " "<< (*it)->int_value << "\n";
 359         break;
 360       case SGPropertyNode::FLOAT:
 361       case SGPropertyNode::DOUBLE:
 362         xdr = XDR_encode_float((*it)->float_value);;
 363         memcpy(ptr, &xdr, sizeof(xdr_data_t));
 364         ptr += sizeof(xdr_data_t);
 365         //cout << "Prop:" << (*it)->id << " " << (*it)->type << " "<< (*it)->float_value << "\n";
 366         break;
 367       case SGPropertyNode::STRING:
 368       case SGPropertyNode::UNSPECIFIED:
 369         {
 370           // String is complicated. It consists of
 371           // The length of the string
 372           // The string itself
 373           // Padding to the nearest 4-bytes.
 374           const char* lcharptr = (*it)->string_value;
 375
 376           if (lcharptr != 0)
 377           {
 378             // Add the length
 379             ////cout << "String length: " << strlen(lcharptr) << "\n";
 380             uint32_t len = strlen(lcharptr);
 381             // XXX This should not be using 4 bytes per character!
 382             if (ptr + (1 + len + (4 - len % 4)) * sizeof (xdr_data_t)
 383                 >= (Msg + MAX_PACKET_SIZE))
 384                 goto escape;
 385             //cout << "String length unint32: " << len << "\n";
 386             xdr = XDR_encode_uint32(len);
 387             memcpy(ptr, &xdr, sizeof(xdr_data_t));
 388             ptr += sizeof(xdr_data_t);
 389
 390             if (len != 0)
 391             {
 392
 393               // Now the text itself
 394               // XXX This should not be using 4 bytes per character!
 395               int lcount = 0;
 396               while ((*lcharptr != '\0') && (lcount < MAX_TEXT_SIZE))
 397               {
 398                 xdr = XDR_encode_int8(*lcharptr);
 399                 memcpy(ptr, &xdr, sizeof(xdr_data_t));
 400                 ptr += sizeof(xdr_data_t);
 401                 lcharptr++;
 402                 lcount++;
 403               }
 404
 405               //cout << "Prop:" << (*it)->id << " " << (*it)->type << " " << len << " " << (*it)->string_value;
 406
 407               // Now pad if required
 408               while ((lcount % 4) != 0)
 409               {
 410                 xdr = XDR_encode_int8(0);
 411                 memcpy(ptr, &xdr, sizeof(xdr_data_t));
 412                 ptr += sizeof(xdr_data_t);
 413                 lcount++;
 414                 //cout << "0";
 415               }
 416
 417               //cout << "\n";
 418             }
 419           }
 420           else
 421           {
 422             // Nothing to encode
 423             xdr = XDR_encode_uint32(0);
 424             memcpy(ptr, &xdr, sizeof(xdr_data_t));
 425             ptr += sizeof(xdr_data_t);
 426             //cout << "Prop:" << (*it)->id << " " << (*it)->type << " 0\n";
 427           }
 428
 429         }
 430         break;
 431
 432       default:
 433         //cout << " Unknown Type: " << (*it)->type << "\n";
 434         xdr = XDR_encode_float((*it)->float_value);;
 435         memcpy(ptr, &xdr, sizeof(xdr_data_t));
 436         ptr += sizeof(xdr_data_t);
 437         //cout << "Prop:" << (*it)->id << " " << (*it)->type << " "<< (*it)->float_value << "\n";
 438         break;
 439     }
 440
 441     ++it;
 442   }
 443 escape:
 444
 445   T_MsgHdr MsgHdr;
 446   FillMsgHdr(&MsgHdr, POS_DATA_ID, ptr - Msg);
 447   memcpy(Msg, &MsgHdr, sizeof(T_MsgHdr));
 448
 449   mSocket->sendto(Msg, ptr - Msg, 0, &mServer);
 450   SG_LOG(SG_NETWORK, SG_DEBUG, "FGMultiplayMgr::SendMyPosition");
 451 } // FGMultiplayMgr::SendMyPosition()
 452 //////////////////////////////////////////////////////////////////////
 453
 454 //////////////////////////////////////////////////////////////////////
 455 //
 456 //  Name: SendTextMessage
 457 //  Description: Sends a message to the player. The message must
 458 //  contain a valid and correctly filled out header and optional
 459 //  message body.
 460 //
 461 //////////////////////////////////////////////////////////////////////
 462 void
 463 FGMultiplayMgr::SendTextMessage(const string &MsgText)
 464 {
 465   if (!mInitialised || !mHaveServer)
 466     return;
 467
 468   T_MsgHdr MsgHdr;
 469   FillMsgHdr(&MsgHdr, CHAT_MSG_ID);
 470   //////////////////////////////////////////////////
 471   // Divide the text string into blocks that fit
 472   // in the message and send the blocks.
 473   //////////////////////////////////////////////////
 474   unsigned iNextBlockPosition = 0;
 475   T_ChatMsg ChatMsg;
 476
 477   char Msg[sizeof(T_MsgHdr) + sizeof(T_ChatMsg)];
 478   while (iNextBlockPosition < MsgText.length()) {
 479     strncpy (ChatMsg.Text,
 480              MsgText.substr(iNextBlockPosition, MAX_CHAT_MSG_LEN - 1).c_str(),
 481              MAX_CHAT_MSG_LEN);
 482     ChatMsg.Text[MAX_CHAT_MSG_LEN - 1] = '\0';
 483     memcpy (Msg, &MsgHdr, sizeof(T_MsgHdr));
 484     memcpy (Msg + sizeof(T_MsgHdr), &ChatMsg, sizeof(T_ChatMsg));
 485     mSocket->sendto (Msg, sizeof(T_MsgHdr) + sizeof(T_ChatMsg), 0, &mServer);
 486     iNextBlockPosition += MAX_CHAT_MSG_LEN - 1;
 487
 488   }
 489
 490
 491 } // FGMultiplayMgr::SendTextMessage ()
 492 //////////////////////////////////////////////////////////////////////
 493
 494 //////////////////////////////////////////////////////////////////////
 495 //
 496 //  Name: ProcessData
 497 //  Description: Processes data waiting at the receive socket. The
 498 //  processing ends when there is no more data at the socket.
 499 //
 500 //////////////////////////////////////////////////////////////////////
 501 void
 502 FGMultiplayMgr::Update(void)
 503 {
 504   if (!mInitialised)
 505     return;
 506
 507   /// Just for expiry
 508   SGTimeStamp timestamper;
 509   timestamper.stamp();
 510   long stamp = timestamper.get_seconds();
 511
 512   //////////////////////////////////////////////////
 513   //  Read the receive socket and process any data
 514   //////////////////////////////////////////////////
 515   int bytes;
 516   do {
 517     char Msg[MAX_PACKET_SIZE];
 518     //////////////////////////////////////////////////
 519     //  Although the recv call asks for
 520     //  MAX_PACKET_SIZE of data, the number of bytes
 521     //  returned will only be that of the next
 522     //  packet waiting to be processed.
 523     //////////////////////////////////////////////////
 524     netAddress SenderAddress;
 525     bytes = mSocket->recvfrom(Msg, sizeof(Msg), 0, &SenderAddress);
 526     //////////////////////////////////////////////////
 527     //  no Data received
 528     //////////////////////////////////////////////////
 529     if (bytes <= 0) {
 530       if (errno != EAGAIN && errno != 0) // MSVC output "NoError" otherwise
 531         perror("FGMultiplayMgr::MP_ProcessData");
 532       break;
 533     }
 534     if (bytes <= sizeof(T_MsgHdr)) {
 535       SG_LOG( SG_NETWORK, SG_ALERT, "FGMultiplayMgr::MP_ProcessData - "
 536               << "received message with insufficient data" );
 537       break;
 538     }
 539     //////////////////////////////////////////////////
 540     //  Read header
 541     //////////////////////////////////////////////////
 542     T_MsgHdr* MsgHdr = (T_MsgHdr *)Msg;
 543     MsgHdr->Magic       = XDR_decode_uint32 (MsgHdr->Magic);
 544     MsgHdr->Version     = XDR_decode_uint32 (MsgHdr->Version);
 545     MsgHdr->MsgId       = XDR_decode_uint32 (MsgHdr->MsgId);
 546     MsgHdr->MsgLen      = XDR_decode_uint32 (MsgHdr->MsgLen);
 547     MsgHdr->ReplyPort   = XDR_decode_uint32 (MsgHdr->ReplyPort);
 548     if (MsgHdr->Magic != MSG_MAGIC) {
 549       SG_LOG( SG_NETWORK, SG_ALERT, "FGMultiplayMgr::MP_ProcessData - "
 550               << "message has invalid magic number!" );
 551       break;
 552     }
 553     if (MsgHdr->Version != PROTO_VER) {
 554       SG_LOG( SG_NETWORK, SG_ALERT, "FGMultiplayMgr::MP_ProcessData - "
 555               << "message has invalid protocoll number!" );
 556       break;
 557     }
 558     if (MsgHdr->MsgLen != bytes) {
 559       SG_LOG( SG_NETWORK, SG_ALERT, "FGMultiplayMgr::MP_ProcessData - "
 560               << "message has invalid length!" );
 561       break;
 562     }
 563     //////////////////////////////////////////////////
 564     //  Process messages
 565     //////////////////////////////////////////////////
 566     switch (MsgHdr->MsgId) {
 567     case CHAT_MSG_ID:
 568       ProcessChatMsg(Msg, SenderAddress);
 569       break;
 570     case POS_DATA_ID:
 571       ProcessPosMsg(Msg, SenderAddress, bytes, stamp);
 572       break;
 573     case UNUSABLE_POS_DATA_ID:
 574     case OLD_OLD_POS_DATA_ID:
 575     case OLD_PROP_MSG_ID:
 576     case OLD_POS_DATA_ID:
 577       break;
 578     default:
 579       SG_LOG( SG_NETWORK, SG_ALERT, "FGMultiplayMgr::MP_ProcessData - "
 580               << "Unknown message Id received: " << MsgHdr->MsgId );
 581       break;
 582     }
 583   } while (bytes > 0);
 584
 585   // check for expiry
 586   MultiPlayerMap::iterator it = mMultiPlayerMap.begin();
 587   while (it != mMultiPlayerMap.end()) {
 588     if (it->second->getLastTimestamp() + 10 < stamp) {
 589       std::string name = it->first;
 590       it->second->setDie(true);
 591       mMultiPlayerMap.erase(it);
 592       it = mMultiPlayerMap.upper_bound(name);
 593     } else
 594       ++it;
 595   }
 596 } // FGMultiplayMgr::ProcessData(void)
 597 //////////////////////////////////////////////////////////////////////
 598
 599 //////////////////////////////////////////////////////////////////////
 600 //
 601 //  handle a position message
 602 //
 603 //////////////////////////////////////////////////////////////////////
 604 void
 605 FGMultiplayMgr::ProcessPosMsg(const char *Msg, netAddress & SenderAddress,
 606                               unsigned len, long stamp)
 607 {
 608   T_MsgHdr* MsgHdr = (T_MsgHdr *)Msg;
 609   if (MsgHdr->MsgLen < sizeof(T_MsgHdr) + sizeof(T_PositionMsg)) {
 610     SG_LOG( SG_NETWORK, SG_ALERT, "FGMultiplayMgr::MP_ProcessData - "
 611             << "Position message received with insufficient data" );
 612     return;
 613   }
 614   T_PositionMsg* PosMsg = (T_PositionMsg *)(Msg + sizeof(T_MsgHdr));
 615   FGExternalMotionData motionInfo;
 616   motionInfo.time = XDR_decode_double(PosMsg->time);
 617   motionInfo.lag = XDR_decode_double(PosMsg->lag);
 618   for (unsigned i = 0; i < 3; ++i)
 619     motionInfo.position(i) = XDR_decode_double(PosMsg->position[i]);
 620   SGVec3f angleAxis;
 621   for (unsigned i = 0; i < 3; ++i)
 622     angleAxis(i) = XDR_decode_float(PosMsg->orientation[i]);
 623   motionInfo.orientation = SGQuatf::fromAngleAxis(angleAxis);
 624   for (unsigned i = 0; i < 3; ++i)
 625     motionInfo.linearVel(i) = XDR_decode_float(PosMsg->linearVel[i]);
 626   for (unsigned i = 0; i < 3; ++i)
 627     motionInfo.angularVel(i) = XDR_decode_float(PosMsg->angularVel[i]);
 628   for (unsigned i = 0; i < 3; ++i)
 629     motionInfo.linearAccel(i) = XDR_decode_float(PosMsg->linearAccel[i]);
 630   for (unsigned i = 0; i < 3; ++i)
 631     motionInfo.angularAccel(i) = XDR_decode_float(PosMsg->angularAccel[i]);
 632
 633
 634   //cout << "INPUT MESSAGE\n";
 635   xdr_data_t* xdr = (xdr_data_t*)
 636                    (Msg + sizeof(T_MsgHdr) + sizeof(T_PositionMsg));
 637   while ((char*)xdr < Msg + len) {
 638     FGPropertyData* pData = new FGPropertyData;
 639     SGPropertyNode::Type type = SGPropertyNode::UNSPECIFIED;
 640
 641     // First element is always the ID
 642     pData->id = XDR_decode_uint32(*xdr);
 643     //cout << pData->id << " ";
 644     xdr++;
 645
 646     // Check the ID actually exists and get the type
 647     unsigned i = 0;
 648     bool found = false;
 649     while (FGMultiplayMgr::sIdPropertyList[i].name)
 650     {
 651       if (sIdPropertyList[i].id == pData->id)
 652       {
 653         found = true;
 654         pData->type = sIdPropertyList[i].type;
 655       }
 656
 657       i++;
 658     }
 659
 660     if (found == true)
 661     {
 662       // How we decode the remainder of the property depends on the type
 663       switch (pData->type) {
 664         case SGPropertyNode::INT:
 665         case SGPropertyNode::BOOL:
 666         case SGPropertyNode::LONG:
 667           pData->int_value = XDR_decode_uint32(*xdr);
 668           xdr++;
 669           //cout << pData->int_value << "\n";
 670           break;
 671         case SGPropertyNode::FLOAT:
 672         case SGPropertyNode::DOUBLE:
 673           pData->float_value = XDR_decode_float(*xdr);
 674           xdr++;
 675           //cout << pData->float_value << "\n";
 676           break;
 677         case SGPropertyNode::STRING:
 678         case SGPropertyNode::UNSPECIFIED:
 679           {
 680             // String is complicated. It consists of
 681             // The length of the string
 682             // The string itself
 683             // Padding to the nearest 4-bytes.
 684             uint32_t length = XDR_decode_uint32(*xdr);
 685             xdr++;
 686             //cout << length << " ";
 687
 688             if ((length > 0) && (length < MAX_TEXT_SIZE))
 689             {
 690               pData->string_value = new char[length + 1];
 691               //cout << " String: ";
 692
 693               for (int i = 0; i < length; i++)
 694               {
 695                 pData->string_value[i] = (char) XDR_decode_int8(*xdr);
 696                 xdr++;
 697                 //cout << pData->string_value[i];
 698               }
 699
 700               pData->string_value[length] = '\0';
 701
 702               // Now handle the padding
 703               while ((length % 4) != 0)
 704               {
 705                 xdr++;
 706                 length++;
 707                 //cout << "0";
 708               }
 709             }
 710             else
 711             {
 712               pData->string_value = new char[1];
 713               pData->string_value[0] = '\0';
 714             }
 715
 716             //cout << "\n";
 717           }
 718           break;
 719
 720         default:
 721           pData->float_value = XDR_decode_float(*xdr);
 722           cerr << "Unknown Prop type " << pData->id << " " << pData->type << "\n";
 723           xdr++;
 724           break;
 725       }
 726
 727       motionInfo.properties.push_back(pData);
 728     }
 729     else
 730     {
 731       // We failed to find the property. We'll try the next packet immediately.
 732       //cout << " Unknown\n";
 733     }
 734   }
 735
 736   FGAIMultiplayer* mp = getMultiplayer(MsgHdr->Callsign);
 737   if (!mp)
 738     mp = addMultiplayer(MsgHdr->Callsign, PosMsg->Model);
 739   mp->addMotionInfo(motionInfo, stamp);
 740 } // FGMultiplayMgr::ProcessPosMsg()
 741 //////////////////////////////////////////////////////////////////////
 742
 743 //////////////////////////////////////////////////////////////////////
 744 //
 745 //  handle a chat message
 746 //  FIXME: display chat message withi flightgear
 747 //
 748 //////////////////////////////////////////////////////////////////////
 749 void
 750 FGMultiplayMgr::ProcessChatMsg(const char *Msg, netAddress& SenderAddress)
 751 {
 752   T_MsgHdr* MsgHdr = (T_MsgHdr *)Msg;
 753   if (MsgHdr->MsgLen < sizeof(T_MsgHdr) + 1) {
 754     SG_LOG( SG_NETWORK, SG_ALERT, "FGMultiplayMgr::MP_ProcessData - "
 755             << "Chat message received with insufficient data" );
 756     return;
 757   }
 758
 759   char *MsgBuf = new char[MsgHdr->MsgLen - sizeof(T_MsgHdr)];
 760   strncpy(MsgBuf, ((T_ChatMsg *)(Msg + sizeof(T_MsgHdr)))->Text,
 761           MsgHdr->MsgLen - sizeof(T_MsgHdr));
 762   MsgBuf[MsgHdr->MsgLen - sizeof(T_MsgHdr) - 1] = '\0';
 763
 764   T_ChatMsg* ChatMsg = (T_ChatMsg *)(Msg + sizeof(T_MsgHdr));
 765   SG_LOG ( SG_NETWORK, SG_ALERT, "Chat [" << MsgHdr->Callsign << "]"
 766            << " " << MsgBuf << endl);
 767
 768   delete [] MsgBuf;
 769 } // FGMultiplayMgr::ProcessChatMsg ()
 770 //////////////////////////////////////////////////////////////////////
 771
 772 void
 773 FGMultiplayMgr::FillMsgHdr(T_MsgHdr *MsgHdr, int MsgId, unsigned _len)
 774 {
 775   uint32_t len;
 776   switch (MsgId) {
 777   case CHAT_MSG_ID:
 778     len = sizeof(T_MsgHdr) + sizeof(T_ChatMsg);
 779     break;
 780   case POS_DATA_ID:
 781     len = _len;
 782     break;
 783   default:
 784     len = sizeof(T_MsgHdr);
 785     break;
 786   }
 787   MsgHdr->Magic           = XDR_encode_uint32(MSG_MAGIC);
 788   MsgHdr->Version         = XDR_encode_uint32(PROTO_VER);
 789   MsgHdr->MsgId           = XDR_encode_uint32(MsgId);
 790   MsgHdr->MsgLen          = XDR_encode_uint32(len);
 791   MsgHdr->ReplyAddress    = 0; // Are obsolete, keep them for the server for
 792   MsgHdr->ReplyPort       = 0; // now
 793   strncpy(MsgHdr->Callsign, mCallsign.c_str(), MAX_CALLSIGN_LEN);
 794   MsgHdr->Callsign[MAX_CALLSIGN_LEN - 1] = '\0';
 795 }
 796
 797 FGAIMultiplayer*
 798 FGMultiplayMgr::addMultiplayer(const std::string& callsign,
 799                                const std::string& modelName)
 800 {
 801   if (0 < mMultiPlayerMap.count(callsign))
 802     return mMultiPlayerMap[callsign].get();
 803
 804   FGAIMultiplayer* mp = new FGAIMultiplayer;
 805   mp->setPath(modelName.c_str());
 806   mp->setCallSign(callsign);
 807   mMultiPlayerMap[callsign] = mp;
 808
 809   FGAIManager *aiMgr = (FGAIManager*)globals->get_subsystem("ai_model");
 810   if (aiMgr) {
 811     aiMgr->attach(mp);
 812
 813     /// FIXME: that must follow the attach ATM ...
 814     unsigned i = 0;
 815     while (sIdPropertyList[i].name) {
 816       mp->addPropertyId(sIdPropertyList[i].id, sIdPropertyList[i].name);
 817       ++i;
 818     }
 819   }
 820
 821   return mp;
 822 }
 823
 824 FGAIMultiplayer*
 825 FGMultiplayMgr::getMultiplayer(const std::string& callsign)
 826 {
 827   if (0 < mMultiPlayerMap.count(callsign))
 828     return mMultiPlayerMap[callsign].get();
 829   else
 830     return 0;
 831 }