Difference between revisions of "Unit IGMP"
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Revision as of 01:08, 24 April 2018
Return to Unit Reference
Contents
Description
Ultibo IGMP (Internet Group Management Protocol) unit
To be documented
Constants
IGMP protocol
IGMP_PROTOCOL_* | Note: Some IGMP definitions are in the Protocol or IP modules | |
IGMP_PROTOCOL_NAME = 'IGMP';
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IGMP specific constants
IGMP_* IGMP_TIMEOUT = 0;
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Wait forever on a IGMP Read |
IGMP_BUFFER_SIZE = 65536;
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IGMP Receive Buffer Size |
IGMP_HEADER_SIZE = 8;
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SizeOf(TIGMPHeader); |
IGMP_PACKET_SIZE = 8;
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SizeOf(TIGMPPacket) |
IGMP_QUERY_TIMEOUT = 5000;
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IGMP_REPORT_TIMEOUT = 5000;
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IGMP_TRANSMIT_COUNT = 3;
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Type definitions
IGMP header
PIGMPHeader = ^TIGMPHeader;
TIGMPHeader = packed record
IGMPType:Byte;
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type of IGMP message |
RespTime:Byte;
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Query only otherwise 0 (Always zero in Version 1 (Assume 100)) |
Checksum:Word;
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1s Compliment IP-style checksum |
Address:TInAddr;
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group address being reported or queried (zero for "General" queries) |
IGMP packet
PIGMPPacket = ^TIGMPPacket;
TIGMPPacket = record
| Note: 8 Bytes (Used by IGMPBuffer) | |
Size:LongWord;
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LongWord to keep size even |
Next:PIGMPPacket;
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Followed by RemoteAddress (4 or 16 Bytes) |
Class definitions
IGMP protocol transport
TIGMPProtocolTransport = class(TProtocolTransport)
constructor Create;
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destructor Destroy; override;
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public
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Socket:TIGMPSocket;
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Socket for sending replies |
IGMP protocol
TIGMPProtocol = class(TNetworkProtocol)
constructor Create(AManager:TProtocolManager; const AName:String);
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destructor Destroy; override;
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private
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FGroups:TNetworkList;
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List of TIGMPGroup objects |
function PacketHandler(AHandle:THandle; ASource,ADest,APacket:Pointer; ASize:Integer; ABroadcast:Boolean):Boolean;
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function ControlHandler(AHandle:THandle; ASource,ADest:Pointer; AProtocol,ACommand,ACode:Word; AAddress,AData:Pointer; ASize:Integer):Boolean;
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function SendIGMP1Report(ASocket:TIGMPSocket; ASource,ADest,AAddress:Pointer):Boolean;
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function SendIGMP2Report(ASocket:TIGMPSocket; ASource,ADest,AAddress:Pointer):Boolean;
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function SendIGMP2Leave(ASocket:TIGMPSocket; ASource,ADest,AAddress:Pointer):Boolean;
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function SendIGMP1Query(ASocket:TIGMPSocket; ASource,ADest,AAddress:Pointer):Boolean;
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function SendIGMP2Query(ASocket:TIGMPSocket; ASource,ADest,AAddress:Pointer):Boolean;
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function GetGroup(ATransport:TIGMPProtocolTransport; const AAddress:TInAddr; ALock:Boolean):TIGMPGroup;
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function GetGroupByNext(APrevious:TIGMPGroup; ALock,AUnlock:Boolean):TIGMPGroup;
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function AddGroup(ATransport:TIGMPProtocolTransport; const AAddress:TInAddr; const AHardware:THardwareAddress; ALock:Boolean):TIGMPGroup;
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function RemoveGroup(ATransport:TIGMPProtocolTransport; const AAddress:TInAddr):Boolean;
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procedure FlushGroups(All:Boolean);
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function ProcessGroups:Boolean;
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protected
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function SelectCheck(ASource,ADest:PFDSet; ACode:Integer):Integer; override;
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function SelectWait(ASocket:TProtocolSocket;ACode:Integer;ATimeout:LongWord):Integer; override;
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function SendPacket(ASocket:TProtocolSocket; ASource,ADest:Pointer; ASourcePort,ADestPort:Word; APacket:PPacketFragment; ASize,AFlags:Integer):Integer; override;
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public
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function Accept(ASocket:TProtocolSocket; ASockAddr:PSockAddr; AAddrLength:PInteger):TProtocolSocket; override;
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function Bind(ASocket:TProtocolSocket; var ASockAddr:TSockAddr; AAddrLength:Integer):Integer; override;
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function CloseSocket(ASocket:TProtocolSocket):Integer; override;
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function Connect(ASocket:TProtocolSocket; var ASockAddr:TSockAddr; AAddrLength:Integer):Integer; override;
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function IoctlSocket(ASocket:TProtocolSocket; ACmd:DWORD; var AArg:u_long):Integer; override;
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function GetPeerName(ASocket:TProtocolSocket; var ASockAddr:TSockAddr; var AAddrLength:Integer):Integer; override;
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function GetSockName(ASocket:TProtocolSocket; var ASockAddr:TSockAddr; var AAddrLength:Integer):Integer; override;
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function GetSockOpt(ASocket:TProtocolSocket; ALevel,AOptName:Integer; AOptValue:PChar; var AOptLength:Integer):Integer; override;
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function Listen(ASocket:TProtocolSocket; ABacklog:Integer):Integer; override;
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function Recv(ASocket:TProtocolSocket; var ABuffer; ALength,AFlags:Integer):Integer; override;
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function RecvFrom(ASocket:TProtocolSocket; var ABuffer; ALength,AFlags:Integer; var AFromAddr:TSockAddr; var AFromLength:Integer):Integer; override;
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function Select(ANfds:Integer; AReadfds,AWritefds,AExceptfds:PFDSet; ATimeout:PTimeVal):LongInt; override;
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function Send(ASocket:TProtocolSocket; var ABuffer; ALength,AFlags:Integer):Integer; override;
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function SendTo(ASocket:TProtocolSocket; var ABuffer; ALength,AFlags:Integer; var AToAddr:TSockAddr; AToLength:Integer):Integer; override;
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function SetSockOpt(ASocket:TProtocolSocket; ALevel,AOptName:Integer; AOptValue:PChar; AOptLength:Integer):Integer; override;
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function Shutdown(ASocket:TProtocolSocket; AHow:Integer):Integer; override;
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function Socket(AFamily,AStruct,AProtocol:Integer):TProtocolSocket; override;
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function AddTransport(ATransport:TNetworkTransport):Boolean; override;
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function RemoveTransport(ATransport:TNetworkTransport):Boolean; override;
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function FindSocket(AFamily,AStruct,AProtocol:Word; ALocalAddress,ARemoteAddress:Pointer; ALocalPort,ARemotePort:Word; ABroadcast,AListen,ALock:Boolean; AState:LongWord):TProtocolSocket; override;
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procedure FlushSockets(All:Boolean); override;
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function StartProtocol:Boolean; override;
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function StopProtocol:Boolean; override;
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function ProcessProtocol:Boolean; override;
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IGMP group
TIGMPGroup = class(TListObject)
constructor Create;
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destructor Destroy; override;
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private
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FLock:TCriticalSectionHandle;
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FCount:Word;
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Number of memberships |
FQueryTime:Int64;
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IGMP query reply timer |
FReportTime:Int64;
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IGMP report reply/transmit timer |
FTransmitCount:Word;
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IGMP report transmit counter |
FAddress:TInAddr;
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IP address of group |
FHardware:THardwareAddress;
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Hardware address of group |
FTransport:TNetworkTransport;
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Transport provider for group |
procedure SetCount(ACount:Word);
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function GetActive:Boolean;
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procedure SetQueryTime(const AQueryTime:Int64);
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procedure SetReportTime(const AReportTime:Int64);
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procedure SetTransmitCount(ATransmitCount:Word);
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procedure SetAddress(const AAddress:TInAddr);
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procedure SetHardware(const AHardware:THardwareAddress);
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procedure SetTransport(ATransport:TNetworkTransport);
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public
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property Count:Word read FCount write SetCount;
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property Active:Boolean read GetActive;
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property QueryTime:Int64 read FQueryTime write SetQueryTime;
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property ReportTime:Int64 read FReportTime write SetReportTime;
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property TransmitCount:Word read FTransmitCount write SetTransmitCount;
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property Address:TInAddr read FAddress write SetAddress;
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property Hardware:THardwareAddress read FHardware write SetHardware;
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property Transport:TNetworkTransport read FTransport write SetTransport;
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function AcquireLock:Boolean;
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function ReleaseLock:Boolean;
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procedure IncrementCount;
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procedure DecrementCount;
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procedure IncrementTransmitCount;
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procedure DecrementTransmitCount;
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IGMP socket
TIGMPSocket = class(TProtocolSocket)
| Note: SOCK_RAW | |
constructor Create(AProtocol:TNetworkProtocol; ATransport:TNetworkTransport);
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destructor Destroy; override;
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private
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FRecvData:TIGMPBuffer;
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public
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property RecvData:TIGMPBuffer read FRecvData;
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function IoCtl(ACommand:DWORD; var AArgument:u_long):Integer; override;
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function IsConnected(ALocalAddress,ARemoteAddress:Pointer; ALocalPort,ARemotePort:Word; ABroadcast:Boolean):Boolean; override;
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function IsListening(ALocalAddress,ARemoteAddress:Pointer; ALocalPort,ARemotePort:Word; ABroadcast:Boolean):Boolean; override;
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IGMP buffer
TIGMPBuffer = class(TSocketBuffer)
constructor Create(ASocket:TTransportSocket);
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destructor Destroy; override;
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private
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FOffset:Word;
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Offset to RemoteAddress |
FLength:Word;
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Length of RemoteAddress |
FRead:Pointer;
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Pointer to Next Read from Buffer |
FWrite:Pointer;
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Pointer to Next Write to Buffer |
FCount:LongWord;
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Number of Packets in Buffer |
FFirst:PIGMPPacket;
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Pointer to First Packet |
FLast:PIGMPPacket;
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Pointer to Last Packet |
function AddPacket(ASize:Integer):Boolean;
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function RemovePacket:Boolean;
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procedure FlushPackets;
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protected
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procedure SetSize(ASize:LongWord); override;
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public
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function GetNext:Integer;
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function GetCount:LongWord;
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function ReadBuffer(var ABuffer; var ASize:Integer; ARemoteAddress:Pointer; AFlags:Integer):Boolean;
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function WriteBuffer(var ABuffer; ASize:Integer; ARemoteAddress:Pointer):Boolean;
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Public variables
None defined
Function declarations
Initialization functions
procedure IGMPInit;
Description: To be documented
| Note | None documented |
|---|
IGMP functions
function CheckIGMP(AFamily:Word; ABuffer:Pointer):Boolean;
Description: Verify that the packet is a valid IGMP packet
| Buffer | The complete packet including Transport header |
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function GetIGMPHeaderOffset(AFamily:Word; ABuffer:Pointer):Word;
Description: To be documented
| Buffer | The complete packet including Transport header |
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function GetIGMPHeaderLength(AFamily:Word; ABuffer:Pointer):Word;
Description: To be documented
| Buffer | The complete packet including Transport header |
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function GetIGMPDataOffset(AFamily:Word; ABuffer:Pointer):Word;
Description: To be documented
| Buffer | The complete packet including Transport header |
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function GetIGMPDataLength(AFamily:Word; ABuffer:Pointer):Word;
Description: To be documented
| Buffer | The complete packet including Transport header |
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function ChecksumIGMP(AFamily:Word; ABuffer:Pointer; AOffset,ALength:Word):Word;
Description: Checksum the IGMP Header on Send/Validate the Checksum on Receive
| Note | Checksum is calculated on the whole packet (Header and Data) |
|---|
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