Unit IGMP - Ultibo.org
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Contents
Description
Ultibo IGMP (Internet Group Management Protocol) unit
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
Note: Some IGMP definitions are in the Protocol or IP modules
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 specific classes
Public variables
None defined
Function declarations
Initialization functions
procedure IGMPInit;
Description: To be 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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