Difference between revisions of "Unit IGMP"

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----
 
----
  
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''To be documented''
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'''Ultibo IGMP (Internet Group Management Protocol) unit'''
  
 
=== Constants ===
 
=== Constants ===
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<div style="font-size: 14px; padding-left: 12px;">'''IGMP specific constants''' <code> IGMP_PROTOCOL_* </code></div>
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<div style="font-size: 14px; padding-left: 12px;">'''IGMP protocol''' <code> IGMP_PROTOCOL_* </code></div>
 
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<br />   
 
<br />   
 
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<div style="font-size: 14px; padding-left: 12px;">'''IGMP constants''' <code> IGMP_* </code></div>
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<div style="font-size: 14px; padding-left: 12px;">'''IGMP specific constants''' <code> IGMP_* </code></div>
 
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----
 
----
  
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''To be documented''
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 +
'''IGMP header'''
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<code>PIGMPHeader = ^TIGMPHeader;</code>
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<code>TIGMPHeader = packed record</code>
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{| class="wikitable" style="font-size: 14px; background: white;"
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|-
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Note: Some IGMP definitions are in the Protocol or IP modules
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|-
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| <code>IGMPType:Byte;</code>
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| type of IGMP message
 +
|-
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| <code>RespTime:Byte;</code>
 +
| Query only otherwise 0 (Always zero in Version 1 (Assume 100))
 +
|-
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| <code>Checksum:Word;</code>
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| 1s Compliment IP-style checksum
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|-
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| <code>Address:TInAddr;</code>
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| group address being reported or queried (zero for "General" queries)
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|-
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|}
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</div></div>
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'''IGMP packet''' 
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<code>PIGMPPacket = ^TIGMPPacket;</code>
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<code>TIGMPPacket = record</code>
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{| class="wikitable" style="font-size: 14px; background: white;"
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|-
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|colspan="2"|Note: 8 Bytes (Used by IGMPBuffer)
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|-
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| <code>Size:LongWord;</code>
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| LongWord to keep size even
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|-
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| <code>Next:PIGMPPacket;</code>
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| Followed by RemoteAddress (4 or 16 Bytes)
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|-
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|}
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</div></div>
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<br />
 +
 
 +
=== Class definitions ===
 +
----
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 +
 
 +
'''IGMP specific classes'''
 +
 
 +
{| class="wikitable" style="font-size: 14px; text-align: left; width: 100%; height: 50px;"
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|-
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| [[TIGMPProtocolTransport|<code>TIGMPProtocolTransport = class(TProtocolTransport)</code>]]
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|-
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|}
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{| class="wikitable" style="font-size: 14px; text-align: left; width: 100%; height: 50px;"
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|-
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| [[TIGMPProtocol|<code>TIGMPProtocol = class(TNetworkProtocol)</code>]]
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|-
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|}
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{| class="wikitable" style="font-size: 14px; text-align: left; width: 100%; height: 50px;"
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|-
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| [[TIGMPGroup|<code>TIGMPGroup = class(TListObject)</code>]]
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|-
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|}
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{| class="wikitable" style="font-size: 14px; text-align: left; width: 100%; height: 50px;"
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|-
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| [[TIGMPSocket|<code>TIGMPSocket = class(TProtocolSocket)</code>]]
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|-
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|}
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{| class="wikitable" style="font-size: 14px; text-align: left; width: 100%; height: 50px;"
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|-
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| [[TIGMPBuffer|<code>TIGMPBuffer = class(TSocketBuffer)</code>]]
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|-
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|}
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<br />
  
 
=== Public variables ===
 
=== Public variables ===
 
----
 
----
  
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''To be documented''
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''None defined''
  
 
=== Function declarations ===
 
=== Function declarations ===
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|-
 
|-
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! '''Note'''
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! Note
 
| None documented
 
| None documented
 
|-
 
|-
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|-
 
|-
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! '''Buffer'''
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! Buffer
 
| The complete packet including Transport header
 
| The complete packet including Transport header
 
|-
 
|-
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|-
 
|-
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! '''Buffer'''
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! Buffer
 
| The complete packet including Transport header
 
| The complete packet including Transport header
 
|-
 
|-
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|-
 
|-
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! '''Buffer'''
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! Buffer
 
| The complete packet including Transport header
 
| The complete packet including Transport header
 
|-
 
|-
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{| class="wikitable" style="font-size: 14px; background: white;"
 
|-
 
|-
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! '''Buffer'''
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! Buffer
 
| The complete packet including Transport header
 
| The complete packet including Transport header
 
|-
 
|-
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{| class="wikitable" style="font-size: 14px; background: white;"
 
|-
 
|-
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! '''Buffer'''
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! Buffer
 
| The complete packet including Transport header
 
| The complete packet including Transport header
 
|-
 
|-
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<pre style="border: 0; padding-bottom:0px;">function ChecksumIGMP(AFamily:Word; ABuffer:Pointer; AOffset,ALength:Word):Word;</pre>
 
<pre style="border: 0; padding-bottom:0px;">function ChecksumIGMP(AFamily:Word; ABuffer:Pointer; AOffset,ALength:Word):Word;</pre>
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<div style="font-size: 14px; padding-left: 12px;">'''Description:''' Checksum the IGMP Header on Send / Validate the Checksum on Receive</div>
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<div style="font-size: 14px; padding-left: 12px;">'''Description:''' Checksum the IGMP Header on Send/Validate the Checksum on Receive</div>
 
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|-
 
|-
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! '''Note'''
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! Note
 
| Checksum is calculated on the whole packet (Header and Data)
 
| Checksum is calculated on the whole packet (Header and Data)
 
|-
 
|-

Latest revision as of 05:24, 31 August 2021

Return to Unit Reference


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';  


IGMP specific constants IGMP_*
IGMP_TIMEOUT = 0; Wait forever on a IGMP Read
IGMP_BUFFER_SIZE = 65536; IGMP Receive Buffer Size
 
IGMP_HEADER_SIZE = 8; SizeOf(TIGMPHeader);
 
IGMP_PACKET_SIZE = 8; SizeOf(TIGMPPacket)
 
IGMP_QUERY_TIMEOUT = 5000;  
IGMP_REPORT_TIMEOUT = 5000;  
 
IGMP_TRANSMIT_COUNT = 3;  


Type definitions


IGMP header

PIGMPHeader = ^TIGMPHeader;

TIGMPHeader = packed record

Note: Some IGMP definitions are in the Protocol or IP modules
IGMPType:Byte; type of IGMP message
RespTime:Byte; Query only otherwise 0 (Always zero in Version 1 (Assume 100))
Checksum:Word; 1s Compliment IP-style checksum
Address:TInAddr; group address being reported or queried (zero for "General" queries)

IGMP packet

PIGMPPacket = ^TIGMPPacket;

TIGMPPacket = record

Note: 8 Bytes (Used by IGMPBuffer)
Size:LongWord; LongWord to keep size even
Next:PIGMPPacket; Followed by RemoteAddress (4 or 16 Bytes)


Class definitions


IGMP specific classes

TIGMPProtocolTransport = class(TProtocolTransport)
TIGMPProtocol = class(TNetworkProtocol)
TIGMPGroup = class(TListObject)
TIGMPSocket = class(TProtocolSocket)
TIGMPBuffer = class(TSocketBuffer)


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 


function GetIGMPHeaderOffset(AFamily:Word; ABuffer:Pointer):Word;
Description: To be documented
Buffer The complete packet including Transport header 


function GetIGMPHeaderLength(AFamily:Word; ABuffer:Pointer):Word;
Description: To be documented
Buffer The complete packet including Transport header 


function GetIGMPDataOffset(AFamily:Word; ABuffer:Pointer):Word;
Description: To be documented
Buffer The complete packet including Transport header 


function GetIGMPDataLength(AFamily:Word; ABuffer:Pointer):Word;
Description: To be documented
Buffer The complete packet including Transport header 


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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