Difference between revisions of "LSL Protocol/Restrained Love Relay/Other Implementations/Felis Darwin's Amethyst Plugin"

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''This version fixes a few things, like instituting an actual timeout for the ask dialog and fixing a loophole in the "ask" mode that could allow items to restrict you even if you hadn't approved them yet.  '''This is a work in progress.'''  Eventually it will have some of the features suggested by Marine in the original Reference Implementation.''
''This is an Amethyst Plugin implementation of the Restrained Life Relay, meant for use in Amethyst collars.  '''At the moment this plugin may nullify commands issued by the standard Amethyst Restrained Life Plugin.'''  I am working on a way to detect what restrictions have been put in place by the RLV plugin, and should that prove to be impossible I will simply write my own version with that capacity to go with this plugin.''
 
''This version adds a few important things to the Reference Implementation, like periodically pinging the restraining object and fixing a loophole in the "ask" mode that could allow items to restrict you even if you hadn't approved them yet.  '''This is a work in progress.'''  Eventually it will have most of the features suggested by Marine in the original Reference Implementation.''


<lsl>
<lsl>
Line 74: Line 76:
key    lastForceSitDestination;
key    lastForceSitDestination;
integer lastForceSitTime;
integer lastForceSitTime;
integer lastPingTime;


// ---------------------------------------------------
// ---------------------------------------------------
Line 546: Line 546:
         timerTickCounter = 0;
         timerTickCounter = 0;
         llSetTimerEvent(1.0);
         llSetTimerEvent(1.0);
        lastPingTime = llGetUnixTime();
         loginWaitingForPong = TRUE;
         loginWaitingForPong = TRUE;
     }
     }
Line 735: Line 734:
             reinforceKnownRestrictions();
             reinforceKnownRestrictions();
             pingWorldObjectIfUnderRestrictions();
             pingWorldObjectIfUnderRestrictions();
            llSetTimerEvent((float)PING_INTERVAL);
         }
         }
         // remind the current mode to the user
         // remind the current mode to the user
Line 745: Line 743:
     {
     {
         timerTickCounter++;
         timerTickCounter++;
        if(timerTickCounter == 0)
            pingWorldObjectIfUnderRestrictions();       
       
         debug("timer (" + (string) timerTickCounter + "): waiting for pong: " + (string) loginWaitingForPong + " pendingForceSit: " + (string) loginPendingForceSit);
         debug("timer (" + (string) timerTickCounter + "): waiting for pong: " + (string) loginWaitingForPong + " pendingForceSit: " + (string) loginPendingForceSit);
         if (loginWaitingForPong && (timerTickCounter >= LOGIN_DELAY_WAIT_FOR_PONG || lastPingTime + PING_INTERVAL <= llGetUnixTime()))
         if (loginWaitingForPong && (timerTickCounter >= LOGIN_DELAY_WAIT_FOR_PONG))
         {
         {
             llWhisper(0, "Lucky Day: " + llKey2Name(llGetOwner()) + " is freed because the device is not available.");
             llWhisper(0, "Lucky Day: " + llKey2Name(llGetOwner()) + " is freed because the device is not available.");
Line 787: Line 788:
         if (!loginPendingForceSit && !loginWaitingForPong && sPendingId == NULL_KEY)
         if (!loginPendingForceSit && !loginWaitingForPong && sPendingId == NULL_KEY)
         {
         {
             pingWorldObjectIfUnderRestrictions();
             timerTickCounter = -1;
             llSetTimerEvent((float)PING_INTERVAL);
             llSetTimerEvent((float)PING_INTERVAL);
         }
         }

Revision as of 02:46, 25 June 2008

This is an Amethyst Plugin implementation of the Restrained Life Relay, meant for use in Amethyst collars. At the moment this plugin may nullify commands issued by the standard Amethyst Restrained Life Plugin. I am working on a way to detect what restrictions have been put in place by the RLV plugin, and should that prove to be impossible I will simply write my own version with that capacity to go with this plugin.

This version adds a few important things to the Reference Implementation, like periodically pinging the restraining object and fixing a loophole in the "ask" mode that could allow items to restrict you even if you hadn't approved them yet. This is a work in progress. Eventually it will have most of the features suggested by Marine in the original Reference Implementation.

<lsl>

//== RestrainedLife Viewer Relay Script //== by Felis Darwin //== Based on Reference Implementation by Marine Kelley

integer ALLOW_REMOVE_DETACH = TRUE; integer DEBUG = FALSE;

// --------------------------------------------------- // Amethyst Plugin Variables // ---------------------------------------------------

key nullkey = NULL_KEY; string nullstr = "";

integer secaccess=0; //== Do secondary owners have access to the RL functions?

// Internal variables key ownerkey = nullkey; list secowners = [];

key setby = NULL_KEY; //== Who set the RLV Relay status?

integer lockstatus; //== Has the collar been locked by the RLV plugin?

// --------------------------------------------------- // Constants // ---------------------------------------------------

integer RLVRS_PROTOCOL_VERSION = 1014; // version of the protocol, stated on the specification page

string PREFIX_RL_COMMAND = "@"; string PREFIX_METACOMMAND = "!";

integer RLVRS_CHANNEL = -1812221819; // RLVRS in numbers integer DIALOG_CHANNEL = -1812220409; // RLVDI in numbers

integer MAX_OBJECT_DISTANCE = 20; // 20m is llSay distance integer MAX_TIME_AUTOACCEPT_AFTER_FORCESIT = 60; // seconds

integer PERMISSION_DIALOG_TIMEOUT = 30;

integer LOGIN_DELAY_WAIT_FOR_PONG = 10; integer LOGIN_DELAY_WAIT_FOR_FORCE_SIT = 60;

integer PING_INTERVAL = 60; //== Time between pings

integer MODE_OFF = 0; integer MODE_ASK = 1; integer MODE_AUTO = 2;

// --------------------------------------------------- // Variables // ---------------------------------------------------

integer nMode;

list lRestrictions; // restrictions currently applied (without the "=n" part) key kSource; // UUID of the object I'm commanded by, always equal to NULL_KEY if lRestrictions is empty, always set if not

string sPendingName; // name of initiator of pending request (first request of a session in mode 1) key sPendingId; // UUID of initiator of pending request (first request of a session in mode 1) string sPendingMessage; // message of pending request (first request of a session in mode 1) integer sPendingTime;

// used on login integer timerTickCounter; // count the number of time events on login (forceSit has to be delayed a bit) integer loginWaitingForPong; integer loginPendingForceSit;

key lastForceSitDestination; integer lastForceSitTime;

// --------------------------------------------------- // Low Level Communication // ---------------------------------------------------


debug(string x) { 

   if (DEBUG)
   {
       llOwnerSay("DEBUG: " + x);
   }

}

// acknowledge or reject ack(string cmd_id, key id, string cmd, string ack) { 

   llSay(RLVRS_CHANNEL, cmd_id + "," + (string)id + "," + cmd + "," + ack);

}

// cmd begins with a '@' sendRLCmd(string cmd) { 

   llOwnerSay(cmd);

}

// get current mode as string string getModeDescription() { 

   if (nMode == 0) return "RLV Relay is OFF"; 
   else if (nMode == 1) return "RLV Relay is ON (permission needed)"; 
   else return "RLV Relay is ON (auto-accept)";

}

// check that this command is for us and not someone else integer verifyWeAreTarget(string message) { 

   list tokens = llParseString2List(message, [","], []);
   if (llGetListLength(tokens) == 3) // this is a normal command
   {
     if (llList2String(tokens, 1) == llGetOwner()) // talking to me ?
     {
        return TRUE;
     }
   }
   return FALSE;

}

// --------------------------------------------------- // Permission Handling // ---------------------------------------------------

// are we already under command by this object? integer isObjectKnow(key id) { 

   // first some error handling
   if (id == NULL_KEY)
   {
       return FALSE;
   }

   // are we already under command by this object?
   if (kSource == id)
   {
       return TRUE;
   }

   // are we not under command by any object but were we forced to sit on this object recently?
   if ((kSource == NULL_KEY) && (id == lastForceSitDestination))
   {
       debug("on last force sit target");
       if (lastForceSitTime + MAX_TIME_AUTOACCEPT_AFTER_FORCESIT > llGetUnixTime())
       {
           debug("and recent enough to auto accept");
           return TRUE;
       }
   }

   return FALSE;

}


// check whether the object is in llSay distance. // The specification requires llSay instead of llShout or llRegionSay // to be used to limit the range. But this has to be checked here again // because the objects are not trustworthy. integer isObjectNear(key id) { 

   vector myPosition = llGetRootPosition();
   list temp = llGetObjectDetails(id, ([OBJECT_POS]));
   vector objPostition = llList2Vector(temp,0);
   float distance = llVecDist(objPostition, myPosition);
   return distance <= MAX_OBJECT_DISTANCE;

}

// do a basic check on the identity of the object trying to issue a command integer isObjectIdentityTrustworthy(key id) { 

   key parcel_owner=llList2Key (llGetParcelDetails (llGetPos (), [PARCEL_DETAILS_OWNER]), 0);
   key parcel_group=llList2Key (llGetParcelDetails (llGetPos (), [PARCEL_DETAILS_GROUP]), 0);
   key object_owner=llGetOwnerKey(id);
   key object_group=llList2Key (llGetObjectDetails (id, [OBJECT_GROUP]), 0);

   debug("owner= " + (string) parcel_owner + " / " + (string) object_owner);
   debug("group= " + (string) parcel_group + " / " + (string) object_group);

   if (object_owner==llGetOwner ()        // IF I am the owner of the object
     || object_owner==parcel_owner        // OR its owner is the same as the parcel I'm on
     || object_group==parcel_group        // OR its group is the same as the parcel I'm on
   )
   {
       return TRUE;
   }
   return FALSE;

}


// Is this a simple request for information or a meta command like !release? integer isSimpleRequest(list list_of_commands) { 

   integer len = llGetListLength(list_of_commands);
   integer i;

   debug("Checking simplicity of commands...");

   // now check every single atomic command
   for (i=0; i < len; ++i)
   {
       string command = llList2String(list_of_commands, i);
       if (!isSimpleAtomicCommand(command))
       {
          debug("Command "+ command +" fails simplicity check.");
          return FALSE;
       }
   }

   // all atomic commands passed the test
   return TRUE;

}

// is this a simple atmar command // (a command which only queries some information or releases restrictions) // (e. g.: cmd ends with "=" and a number (@version, @getoutfit, @getattach) or is a !-meta-command) integer isSimpleAtomicCommand(string cmd) { 

   // check right hand side of the "=" - sign
   integer index = llSubStringIndex (cmd, "=");
   if (index > -1) // there is a "=" 
   {
       // check for a number after the "="
       string param = llGetSubString (cmd, index + 1, -1);
       if (((integer)param!=0 || param=="0") && llSubStringIndex(param, "n") <= -1 && llSubStringIndex(param, "add")<= -1) // is it an integer (channel number)?
       {
           return TRUE;
       }

       // removing restriction
       if ((param == "y") || (param == "rem"))
       {
           return TRUE;
       }
   }

   // check for a leading ! (meta command)
   if (llSubStringIndex(cmd, PREFIX_METACOMMAND) == 0)
   {
       return TRUE;
   }

   // check for @clear
   // Note: @clear MUST NOT be used because the restrictions will be reapplied on next login
   // (but we need this check here because "!release|@clear" is a BROKEN attempt to work around
   // a bug in the first relay implementation. You should refuse to use relay versions < 1013
   // instead.)
   if (cmd == "@clear")
   {
       return TRUE;
   }

   // this one is not "simple".
   return FALSE;

}

// If we already have commands from this object pending // because of a permission request dialog, just add the // new commands at the end. // Note: We use a timeout here because the player may // have "ignored" the dialog. integer tryToGluePendingCommands(key id, string commands) { 

   if ((sPendingId == id) && (sPendingTime + PERMISSION_DIALOG_TIMEOUT > llGetUnixTime()))
   {
       debug("Gluing " + sPendingMessage + " with " + commands);
       sPendingMessage = sPendingMessage + "|" + commands;
       return TRUE;
   }
   return FALSE;

}

// verifies the permission. This includes mode // (off, permission, auto) of the relay and the // identity of the object (owned by parcel people). integer verifyPermission(key id, string name, string message) { 

   debug("Verifying permission for command "+ message);
   
   // is it switched off?
   if (nMode == MODE_OFF)
   {
       return FALSE;
   }

   // extract the commands-part
   list tokens = llParseString2List (message, [","], []);
   if (llGetListLength (tokens) < 3)
   {
       return FALSE;
   }
   string commands = llList2String(tokens, 2);
   list list_of_commands = llParseString2List(commands, ["|"], []);

   // accept harmless commands silently
   if (isSimpleRequest(list_of_commands))
   {
       debug("Simple command, performing");
       return TRUE;
   }

   // if we are already having a pending permission-dialog request for THIS object,
   // just add the new commands at the end of the pending command list.
   if (tryToGluePendingCommands(id, commands))
   {
       debug("Appending to store of commands pending approval.");
       return FALSE; //== Glue the commands and process them later
   }

   // check whether this object belongs here
   integer trustworthy = isObjectIdentityTrustworthy(id);
   string warning = "";
   if (!trustworthy)
   {
       warning = "\n\nWARNING: This object is not owned by the people owning this parcel. Unless you know the owner, you should deny this request.";
   }

   // ask in permission-request-mode and/OR in case the object identity is suspisous.
   if (nMode == MODE_ASK || !trustworthy)
   {
       sPendingId=id;
       sPendingName=name;
       sPendingMessage=message;
       sPendingTime = llGetUnixTime();
       
       llSetTimerEvent(2.0);
       
       if(llKey2Name(llGetOwnerKey(id)) != "")
           name += " (owned by "+llKey2Name(llGetOwnerKey(id))+")";
       
       llDialog (llGetOwner(), name + " would like control your viewer." + warning + ".\n\nDo you accept ?", ["Yes", "No"], DIALOG_CHANNEL);
       debug("Asking for permission");
       return FALSE;
   }
   return TRUE;

}


// --------------------------------------------------- // Executing of commands // ---------------------------------------------------

// execute a non-parsed message // this command could be denied here for policy reasons, (if it were implemenetd) // but this time there will be an acknowledgement execute(string name, key id, string message) { 

   list tokens=llParseString2List (message, [","], []);
   if (llGetListLength (tokens)==3) // this is a normal command
   {
       string cmd_id=llList2String (tokens, 0); // CheckAttach
       key target=llList2Key (tokens, 1); // UUID
       if (target==llGetOwner ()) // talking to me ?
       {
           list list_of_commands=llParseString2List (llList2String (tokens, 2), ["|"], []);
           integer len=llGetListLength (list_of_commands);
           integer i;
           string command;
           string prefix;
           for (i=0; i<len; ++i) // execute every command one by one
           {
               // a command is a RL command if it starts with '@' or a metacommand if it starts with '!'
               command=llList2String (list_of_commands, i);
               prefix=llGetSubString (command, 0, 0);

               if (prefix==PREFIX_RL_COMMAND) // this is a RL command
               {
                   executeRLVCommand(cmd_id, id, command);
               }
               else if (prefix==PREFIX_METACOMMAND) // this is a metacommand, aimed at the relay itself
               {
                   executeMetaCommand(cmd_id, id, command);
               }
           }
       }
   }

}

// executes a command for the restrained life viewer // with some additinal magic like book keeping executeRLVCommand(string cmd_id, string id, string command) { 

   // we need to know whether whether is a rule or a simple command
   list tokens_command=llParseString2List (command, ["="], []);
   string behav=llList2String (tokens_command, 0); // @getattach:skull
   string param=llList2String (tokens_command, 1); // 2222
   integer ind=llListFindList (lRestrictions, [behav]);

   debug("param=" + param);

   if (param=="n" || param=="add") // add to lRestrictions
   {
       if (ind<0) lRestrictions+=[behav];

       if(kSource == NULL_KEY && !lockstatus)
           llOwnerSay("@detach=n");
               
       kSource=id; // we know that kSource is either NULL_KEY or id already
   }
   else if (param=="y" || param=="rem") // remove from lRestrictions
   {
       if (ind>-1) lRestrictions=llDeleteSubList (lRestrictions, ind, ind);
       if (llGetListLength (lRestrictions)==0)
       {
           kSource=NULL_KEY;
           if(!lockstatus)
               llOwnerSay("@detach=y");
       }
       
   }
   else if (param == "force" && !ALLOW_REMOVE_DETACH)
   {
       debug("force: " + behav);
       list temp = llParseString2List(behav, [":"], []);
       string commandName = llList2String (temp, 0); // @sit
       if (commandName == "@detach" || commandName == "@remoutfit")
       {
           debug("rejecting remove/detach");
           llWhisper(0, "Not stripping");
           ack(cmd_id, id, command, "ko");
           return;
       }
   }

   workaroundForAtClear(command);
   rememberForceSit(command);
   sendRLCmd(command); // execute command
   ack(cmd_id, id, command, "ok"); // acknowledge

}

// check for @clear // Note: @clear MUST NOT be used because the restrictions will be reapplied on next login // (but we need this check here because "!release|@clear" is a BROKEN attempt to work around // a bug in the first relay implementation. You should refuse to use relay versions < 1013 // instead.) workaroundForAtClear(string command) { 

   if (command == "@clear")
   {
       releaseRestrictions();
   }

}

// remembers the time and object if this command is a force sit rememberForceSit(string command) { 

   list tokens_command=llParseString2List (command, ["="], []);
   string behav=llList2String (tokens_command, 0); // @sit:<uuid>
   string param=llList2String (tokens_command, 1); // force
   if (param != "force")
   {
       return;
   }

   tokens_command=llParseString2List(behav, [":"], []);
   behav=llList2String (tokens_command, 0); // @sit
   param=llList2String (tokens_command, 1); // <uuid>
   debug("'force'-command:" + behav + "/" + param);
   if (behav != "@sit")
   {
       return;
   }
   lastForceSitDestination = (key) param;
   lastForceSitTime = llGetUnixTime();
   debug("remembered force sit");

}

// executes a meta command which is handled by the relay itself executeMetaCommand(string cmd_id, string id, string command) { 

   if (command==PREFIX_METACOMMAND+"version") // checking relay version
   {
       ack(cmd_id, id, command, (string)RLVRS_PROTOCOL_VERSION);
   }
   else if (command==PREFIX_METACOMMAND+"release") // release all the restrictions (end session)
   {
       releaseRestrictions();
       ack(cmd_id, id, command, "ok");
   }

}

// lift all the restrictions (called by !release and by turning the relay off) releaseRestrictions () { 

   kSource=NULL_KEY;
   if(!lockstatus)
       llOwnerSay("@detach=y");
   integer i;
   integer len=llGetListLength (lRestrictions);
   for (i=0; i<len; ++i)
   {
       sendRLCmd(llList2String (lRestrictions, i)+"=y");
   }
   lRestrictions = [];
   loginPendingForceSit = FALSE;

}


// --------------------------------------------------- // initialisation and login handling // ---------------------------------------------------

init() { 

   nMode=1;
   kSource=NULL_KEY;
   lRestrictions=[];
   sPendingId=NULL_KEY;
   sPendingName="";
   sPendingMessage="";
   llListen (RLVRS_CHANNEL, "", "", "");
   llListen (DIALOG_CHANNEL, "", llGetOwner(), "");
   llOwnerSay (getModeDescription());

}

// sends the known restrictions (again) to the RL-viewer // (call this functions on login) reinforceKnownRestrictions() { 

   integer i;
   integer len=llGetListLength(lRestrictions);
   string restr;
   debug("kSource=" + (string) kSource);
   for (i=0; i<len; ++i)
   {
       restr=llList2String(lRestrictions, i);
       debug("restr=" + restr);
       sendRLCmd(restr+"=n");
       if (restr=="@unsit")
       {
           loginPendingForceSit = TRUE;
       }
   }

}

// send a ping request and start a timer pingWorldObjectIfUnderRestrictions() { 

   loginWaitingForPong = FALSE;
   if (kSource != NULL_KEY)
   {
       ack("ping", kSource, "ping", "ping");
       timerTickCounter = 0;
       llSetTimerEvent(1.0);
       loginWaitingForPong = TRUE;
   }

}

// Handle commands HandleCommand(string message, key id) { 

   list templist = llParseString2List(llToLower(message), [" "], []);
   string cmd = llList2String(templist, 0);

   if(cmd == "relay")
   {
       if(id == ownerkey || (llListFindList(secowners, [id]) > -1 && (ownerkey == NULL_KEY || secaccess)) || (id == llGetOwner() && (setby == NULL_KEY || setby == llGetOwner() || (setby != ownerkey && llListFindList(secowners, [setby]) <= -1))))
       {
           integer change = 0;
           
           string second = llList2String(templist, 1);
           
           if(kSource != NULL_KEY && id == llGetOwner())
           {
               llOwnerSay("You cannot change relay modes while the relay is locked.");
               return;   
           }
           
           if(id == ownerkey && (second == "secondaries" || second == "sec"))
           {
               string third = llList2String(templist, 2);

               if(third == "on" || third == "auto" || (third == "" && !secaccess))
               {
                   secaccess = 1;
                   llWhisper(0, "Secondary owners can now adjust Restrained Life Relay settings.");
               }
               else
               {
                   secaccess = 0;
                   llWhisper(0, "Secondary owners cannot adjust Restrained Life Relay settings.");
               }
           }
           
           else if(second == "on" || second == "auto")
           {
               nMode = MODE_AUTO;
               change = 1;
           }
           else if(second == "off")
           {
               nMode = MODE_OFF;
               change = 1;   
           }
           else if(second == "ask")
           {
               nMode = MODE_ASK;
               change = 1;   
           }
           
           else if(second == "" || second == "mode")
           {
               nMode++;
               if(nMode > 2) nMode = 0;
               change = 1;   
           }
           
           if(change)
           {
               setby = NULL_KEY;
               if (nMode == MODE_OFF)
               {
                   llSetTimerEvent(0.0);
                   releaseRestrictions();
               }
               else
               {
                   llSetTimerEvent((float)PING_INTERVAL);
                   if(nMode == MODE_AUTO) setby = id;
               }
               if(id == llGetOwner())
                   llOwnerSay(getModeDescription());   
               else
                   llSay(0, getModeDescription());
                   
               llMessageLinked(LINK_THIS, 63, nullstr, nullstr);
           }
       }
       else if(id == llGetOwner())
       {
           llOwnerSay("Sorry, only your owner can deactivate the relay once they enable it.");   
       }
   }

}

default { 

   state_entry()
   {
       // Request owner list from the collar
       llMessageLinked(LINK_THIS, 47, nullstr, nullstr);
       // Reset the plugin list
       llMessageLinked(LINK_THIS, 62, nullstr, nullstr);
       init();
   }
   
   // Handle messages from the collar script
   link_message(integer sender, integer num, string str, key id)
   {
       if(num == 47)
       {
           list templist = llParseString2List(str, [","], []);
           integer x;
           integer count = llGetListLength(templist);
           
           // Handle owner list reply
           ownerkey = id;
           secowners = [];
           for(x=0;x<count;x++)
           {
               secowners = secowners + [ (key)llList2String(templist, x) ];
           }
       }
       // Prefixless commands
       else if(num == 48)
       {
           // Handle Commands on the public or alternate channel
           HandleCommand(str, id);
       }
       else if(num == 33 && id != nullkey)
       {
           // Collar script is giving us an owner
           ownerkey = id;
       }
       else if(num == 34 && id != nullkey)
       {
           // Collar script is giving us a secondary owner
           secowners = secowners + [ id ];
       }
       else if(num == 35)
       {
           // Collar script is clearing owners
           ownerkey = nullkey;
           secowners = [];
       }
       else if(num == 36)
       {
           // Collar script is clearing secondary owners
           secowners = [];
       }
       // Handle plugin update
       else if(num == 62)
       {
           string buttons = "Relay Mode";
           
           if(str == nullstr && (id == nullstr || id == nullkey))
           {
               // Add for owner and owners (key)
               llMessageLinked(LINK_SET, 62, "Relay Sec", buttons);
               // Add for sub and unowned sub (key)
               llMessageLinked(LINK_SET, 63, buttons, nullstr);
           }
       }
       else if(num == 65)
       {
           if((integer)str == TRUE)
               lockstatus = 1;
           else
               lockstatus = 0;   
       }
       else if(num == 66) //== Safeword, unlock
       {
           nMode = MODE_OFF;
           releaseRestrictions();
           llOwnerSay(getModeDescription());
       }
   }
   
   attach(key id)
   {
       if(id == NULL_KEY)
           llOwnerSay("@clear");   
   }
   
   on_rez(integer start_param)
   {
       // relogging, we must refresh the viewer and ping the object if any
       // if mode is not OFF, fire all the stored restrictions
       if (nMode)
       {
           reinforceKnownRestrictions();
           pingWorldObjectIfUnderRestrictions();
       }
       // remind the current mode to the user
       llOwnerSay(getModeDescription());
   }


   timer()
   {
       timerTickCounter++;
       if(timerTickCounter == 0)
           pingWorldObjectIfUnderRestrictions();        
       
       debug("timer (" + (string) timerTickCounter + "): waiting for pong: " + (string) loginWaitingForPong + " pendingForceSit: " + (string) loginPendingForceSit);
       if (loginWaitingForPong && (timerTickCounter >= LOGIN_DELAY_WAIT_FOR_PONG))
       {
           llWhisper(0, "Lucky Day: " + llKey2Name(llGetOwner()) + " is freed because the device is not available.");
           loginWaitingForPong = FALSE;
           loginPendingForceSit = FALSE;
           releaseRestrictions();
       }

       if (loginPendingForceSit)
       {
           integer agentInfo = llGetAgentInfo(llGetOwner());
           if (agentInfo & AGENT_SITTING)
           {
               loginPendingForceSit = FALSE;
               debug("is sitting now");
           }
           else if (timerTickCounter >= LOGIN_DELAY_WAIT_FOR_FORCE_SIT)
           {
               llWhisper(0, "Lucky Day: " + llKey2Name(llGetOwner()) + " is freed because sitting down again was not possible.");
               loginPendingForceSit = FALSE;
               releaseRestrictions();
           }
           else
           {
                sendRLCmd ("@sit:"+(string)kSource+"=force");
           }
       }
       
       if(sPendingId != NULL_KEY)
       {
           if(sPendingTime + PERMISSION_DIALOG_TIMEOUT <= llGetUnixTime())
           {
               llDialog(llGetOwner(),"Request to control your viewer by "+ sPendingName +" automatically denied due to timeout.", ["OK"], DIALOG_CHANNEL);
               sPendingId = NULL_KEY;
               sPendingName = "";
               sPendingMessage = "";    
           }  
       }

       if (!loginPendingForceSit && !loginWaitingForPong && sPendingId == NULL_KEY)
       {
           timerTickCounter = -1;
           llSetTimerEvent((float)PING_INTERVAL);
       }
   }

   listen(integer channel, string name, key id, string message)
   {
       if (channel==RLVRS_CHANNEL)
       {
           debug("LISTEN: " + message);
           if (!verifyWeAreTarget(message))
           {
              return;
           }

           if (nMode== MODE_OFF)
           {
               debug("deactivated - ignoring commands");
               return; // mode is 0 (off) => reject
           }
           if (!isObjectNear(id)) return;

           debug("Got message (active world object " + (string) kSource + "): name=" + name+ "id=" + (string) id + " message=" + message);

           if (kSource != NULL_KEY && kSource != id)
           {
               debug("already used by another object => reject");
               return;
           }

           loginWaitingForPong = FALSE; // whatever the message, it is for me => it satisfies the ping request

           if (!isObjectKnow(id))
           {
               debug("asking for permission because kSource is NULL_KEY");
               if (!verifyPermission(id, name, message))
               {
                   return;
               }
           }

           debug("Executing: " + (string) kSource);
           execute(name, id, message);
       }
       else if (channel==DIALOG_CHANNEL)
       {
           if (id != llGetOwner())
           {
               return; // only accept dialog responses from the owner
           }
           if (sPendingId!=NULL_KEY)
           {
               if (message=="Yes") // pending request authorized => process it
               {
                   execute(sPendingName, sPendingId, sPendingMessage);
               }
               else if(kSource == sPendingId)
                   releaseRestrictions();

               // clear pending request
               sPendingName="";
               sPendingId=NULL_KEY;
               sPendingMessage="";
           }
       }
   }
   
   changed(integer change)
   {
       if (change & CHANGED_OWNER) 
       {
            llResetScript();
       }
   }

}

</lsl>

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