# MessageFilter Class Reference
[MessageFilter]

Assigns systems to FilterSets. Each FilterSet limits what kinds of messages are allowed. The MessageFilter plugin is used for security where you limit what systems can send what kind of messages. You implicitly define FilterSets, and add allowed message IDs and RPC calls to these FilterSets. You then add systems to these filters, such that those systems are limited to sending what the filters allows. You can automatically assign systems to a filter. You can automatically kick and possibly ban users that stay in a filter too long, or send the wrong message. Each system is a member of either zero or one filters. Add this plugin before any plugin you wish to filter (most likely just add this plugin before any other). More...

`#include <MessageFilter.h>`

Inheritance diagram for MessageFilter:

List of all members.

## Public Member Functions
void | SetAutoAddNewConnectionsToFilter (int filterSetID)
void | SetAllowMessageID (bool allow, int messageIDStart, int messageIDEnd, int filterSetID)
void | SetAllowRPC (bool allow, const char *functionName, int filterSetID)
void | SetActionOnDisallowedMessage (bool kickOnDisallowed, bool banOnDisallowed, RakNetTime banTimeMS, int filterSetID)
void | SetDisallowedMessageCallback (int filterSetID, void *userData, void(*invalidMessageCallback)(RakPeerInterface *peer, SystemAddress systemAddress, int filterSetID, void *userData, unsigned char messageID))
void | SetTimeoutCallback (int filterSetID, void *userData, void(*invalidMessageCallback)(RakPeerInterface *peer, SystemAddress systemAddress, int filterSetID, void *userData))
void | SetFilterMaxTime (int allowedTimeMS, bool banOnExceed, RakNetTime banTimeMS, int filterSetID)
int | GetSystemFilterSet (SystemAddress systemAddress)
void | SetSystemFilterSet (SystemAddress systemAddress, int filterSetID)
unsigned | GetSystemCount (int filterSetID) const
SystemAddress | GetSystemByIndex (int filterSetID, unsigned index)
unsigned | GetFilterSetCount (void) const
int | GetFilterSetIDByIndex (unsigned index)
void | DeleteFilterSet (int filterSetID)
virtual void | OnAttach (RakPeerInterface *peer)
virtual void | OnDetach (RakPeerInterface *peer)
virtual void | OnShutdown (RakPeerInterface *peer)
virtual void | Update (RakPeerInterface *peer)
virtual PluginReceiveResult | OnReceive (RakPeerInterface *peer, Packet *packet)
virtual void | OnCloseConnection (RakPeerInterface *peer, SystemAddress systemAddress)

## Detailed Description

Assigns systems to FilterSets. Each FilterSet limits what kinds of messages are allowed. The MessageFilter plugin is used for security where you limit what systems can send what kind of messages. You implicitly define FilterSets, and add allowed message IDs and RPC calls to these FilterSets. You then add systems to these filters, such that those systems are limited to sending what the filters allows. You can automatically assign systems to a filter. You can automatically kick and possibly ban users that stay in a filter too long, or send the wrong message. Each system is a member of either zero or one filters. Add this plugin before any plugin you wish to filter (most likely just add this plugin before any other).

## Member Function Documentation

void MessageFilter::DeleteFilterSet | ( | int | filterSetID | ) |

Delete a FilterSet. All systems formerly subscribed to this filter are now unrestricted.

Parameters:

  `[in]` | filterSetID | The ID of the filter set to delete.

unsigned MessageFilter::GetFilterSetCount | ( | void |  | ) | const

Returns the total number of filter sets.

Returns:
  The total number of filter sets.

int MessageFilter::GetFilterSetIDByIndex | ( | unsigned | index | ) |

Returns the ID of a filter set, by index

Parameters:

  `[in]` | An | index between 0 and GetFilterSetCount()-1 inclusive

SystemAddress MessageFilter::GetSystemByIndex | ( | int | filterSetID,
|  | unsigned | index |
| ) |  |  |

Returns a system subscribed to a particular filter set,by index. index should be between 0 and the GetSystemCount(filterSetID)-1;

Parameters:

  `[in]` | filterSetID | The filter set to limit to. Use -1 for none (just indexes all the filtered systems in that case).
  `[in]` | index | A number between 0 and GetSystemCount(filterSetID)-1;

unsigned MessageFilter::GetSystemCount | ( | int | filterSetID | ) | const

Returns the number of systems subscribed to a particular filter set Using anything other than -1 for filterSetID is slow, so you should store the returned value.

Parameters:

  `[in]` | filterSetID | The filter set to limit to. Use -1 for none (just returns the total number of filter systems in that case).

int MessageFilter::GetSystemFilterSet | ( | SystemAddress | systemAddress | ) |

Get the filterSetID a system is using. Returns -1 for none.

Parameters:

  `[in]` | systemAddress | The system we are referring to

void MessageFilter::OnAttach | ( | RakPeerInterface * | peer | ) | `[virtual]`

Called when the interface is attached

Parameters:

  `[in]` | peer | the instance of RakPeer that is calling Receive

Reimplemented from PluginInterface.

void MessageFilter::OnCloseConnection | ( | RakPeerInterface * | peer,
|  | SystemAddress | systemAddress |
| ) |  |  | `[virtual]`

Called when a connection is dropped because the user called RakPeer::CloseConnection() for a particular system

Parameters:

  `[in]` | peer | the instance of RakPeer that is calling Receive
  `[in]` | systemAddress | The system whose connection was closed

Reimplemented from PluginInterface.

void MessageFilter::OnDetach | ( | RakPeerInterface * | peer | ) | `[virtual]`

Called when the interface is detached

Parameters:

  `[in]` | peer | the instance of RakPeer that is calling Receive

Reimplemented from PluginInterface.

PluginReceiveResult MessageFilter::OnReceive | ( | RakPeerInterface * | peer,
|  | Packet * | packet |
| ) |  |  | `[virtual]`

OnReceive is called for every packet.

Parameters:

  `[in]` | peer | the instance of RakPeer that is calling Receive
  `[in]` | packet | the packet that is being returned to the user

Returns:
  True to allow the game and other plugins to get this message, false to absorb it

Reimplemented from PluginInterface.

void MessageFilter::OnShutdown | ( | RakPeerInterface * | peer | ) | `[virtual]`

Called when RakPeer is shutdown

Parameters:

  `[in]` | peer | the instance of RakPeer that is calling Receive

Reimplemented from PluginInterface.

void MessageFilter::SetActionOnDisallowedMessage | ( | bool | kickOnDisallowed,
|  | bool | banOnDisallowed,
|  | RakNetTime | banTimeMS,
|  | int | filterSetID |
| ) |  |  |

What action to take on a disallowed message. You can kick or not. You can add them to the ban list for some time By default no action is taken. The message is simply ignored. param[in] 0 for permanent ban, >0 for ban time in milliseconds.

Parameters:

  `[in]` | kickOnDisallowed | kick the system that sent a disallowed message.
  `[in]` | banOnDisallowed | ban the system that sent a disallowed message. See banTimeMS for the ban duration
  `[in]` | banTimeMS | Passed to the milliseconds parameter of RakPeer::AddToBanList.
  `[in]` | filterSetID | A user defined ID to represent a filter set. If no filter with this ID exists, one will be created with default settings.

void MessageFilter::SetAllowMessageID | ( | bool | allow,
|  | int | messageIDStart,
|  | int | messageIDEnd,
|  | int | filterSetID |
| ) |  |  |

Allow a range of message IDs Always allowed by default: ID_CONNECTION_REQUEST_ACCEPTED through ID_DOWNLOAD_PROGRESS Usually you specify a range to make it easier to add new enumerations without having to constantly refer back to this function.

Parameters:

  `[in]` | allow | True to allow this message ID, false to disallow. By default, all messageIDs except the noted types are disallowed. This includes messages from other plugins!
  `[in]` | messageIDStart | The first ID_* message to allow in the range. Inclusive.
  `[in]` | messageIDEnd | The last ID_* message to allow in the range. Inclusive.
  `[in]` | filterSetID | A user defined ID to represent a filter set. If no filter with this ID exists, one will be created with default settings.

void MessageFilter::SetAllowRPC | ( | bool | allow,
|  | const char * | functionName,
|  | int | filterSetID |
| ) |  |  |

Allow an RPC function, by name

Parameters:

  `[in]` | allow | True to allow an RPC call with this function name, false to disallow. All RPCs are disabled by default.
  `[in]` | functionName | the function name of the RPC call. Must match the function name exactly, including case.
  `[in]` | filterSetID | A user defined ID to represent a filter set. If no filter with this ID exists, one will be created with default settings.

void MessageFilter::SetAutoAddNewConnectionsToFilter | ( | int | filterSetID | ) |

Automatically add all new systems to a particular filter Defaults to -1

Parameters:

  `[in]` | filterSetID | Which filter to add new systems to. <0 for do not add.

void MessageFilter::SetDisallowedMessageCallback | ( | int | filterSetID,
|  | void * | userData,
|  | void(*)(RakPeerInterface *peer, SystemAddress systemAddress, int filterSetID, void *userData, unsigned char messageID) | invalidMessageCallback |
| ) |  |  |

Set a user callback to be called on an invalid message for a particular filterSet

Parameters:

  `[in]` | filterSetID | A user defined ID to represent a filter set. If no filter with this ID exists, one will be created with default settings.
  `[in]` | userData | A pointer passed with the callback
  `[in]` | invalidMessageCallback | A pointer to a C function to be called back with the specified parameters.

void MessageFilter::SetFilterMaxTime | ( | int | allowedTimeMS,
|  | bool | banOnExceed,
|  | RakNetTime | banTimeMS,
|  | int | filterSetID |
| ) |  |  |

Limit how long a connection can stay in a particular filterSetID. After this time, the connection is kicked and possibly banned. By default there is no limit to how long a connection can stay in a particular filter set.

Parameters:

  `[in]` | allowedTimeMS | How many milliseconds to allow a connection to stay in this filter set.
  `[in]` | banOnExceed | True or false to ban the system, or not, when allowedTimeMS is exceeded
  `[in]` | banTimeMS | Passed to the milliseconds parameter of RakPeer::AddToBanList.
  `[in]` | filterSetID | A user defined ID to represent a filter set. If no filter with this ID exists, one will be created with default settings.

void MessageFilter::SetSystemFilterSet | ( | SystemAddress | systemAddress,
|  | int | filterSetID |
| ) |  |  |

Assign a system to a filter set. Systems are automatically added to filter sets (or not) based on SetAutoAddNewConnectionsToFilter() This function is used to change the filter set a system is using, to add it to a new filter set, or to remove it from all existin filter sets.

Parameters:

  `[in]` | systemAddress | The system we are referring to
  `[in]` | filterSetID | A user defined ID to represent a filter set. If no filter with this ID exists, one will be created with default settings. If -1, the system will be removed from all filter sets.

void MessageFilter::SetTimeoutCallback | ( | int | filterSetID,
|  | void * | userData,
|  | void(*)(RakPeerInterface *peer, SystemAddress systemAddress, int filterSetID, void *userData) | invalidMessageCallback |
| ) |  |  |

Set a user callback to be called when a user is disconnected due to SetFilterMaxTime

Parameters:

  `[in]` | filterSetID | A user defined ID to represent a filter set. If no filter with this ID exists, one will be created with default settings.
  `[in]` | userData | A pointer passed with the callback
  `[in]` | invalidMessageCallback | A pointer to a C function to be called back with the specified parameters.

void MessageFilter::Update | ( | RakPeerInterface * | peer | ) | `[virtual]`

Update is called every time a packet is checked for .

Parameters:

  `[in]` | peer | - the instance of RakPeer that is calling Receive

Reimplemented from PluginInterface.

The documentation for this class was generated from the following files:

- C:/RakNet/Source/MessageFilter.h
- C:/RakNet/Source/MessageFilter.cpp