Difference between revisions of "Unit UDP"

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----
 
----
  
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''To be documented''
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'''Ultibo UDP (User Datagram Protocol) unit'''
  
 
=== Constants ===
 
=== Constants ===
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<br />  
 
<br />  
 
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<div style="font-size: 14px; padding-left: 12px;">'''UDP socket option constants'''</div>
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<div style="font-size: 14px; padding-left: 12px;">'''UDP socket option'''</div>
 
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<br />  
 
<br />  
 
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<div style="font-size: 14px; padding-left: 12px;">'''UDP port constants''' <code> UDP_PORT_* </code></div>
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<div style="font-size: 14px; padding-left: 12px;">'''UDP port''' <code> UDP_PORT_* </code></div>
 
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----
 
----
  
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''To be documented''
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 +
'''UDP header'''
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<code>PUDPHeader = ^TUDPHeader;</code>
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<code>TUDPHeader = packed 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: Some UDP definitions are in the Protocol or IP modules
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|-
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|colspan="2"|Note: 8 Bytes
 +
|-
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| <code>SourcePort:Word;</code>
 +
| Network Order
 +
|-
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| <code>DestPort:Word;</code>
 +
| Network Order
 +
|-
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| <code>Length:Word;</code>
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| Network Order
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|-
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| <code>Checksum:Word;</code>
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| &nbsp;
 +
|-
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|}
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</div></div> 
 +
 
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'''UDP datagram''' 
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<code>PUDPDatagram = ^TUDPDatagram;</code>
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<code>TUDPDatagram = 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 UDPBuffer)
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|-
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| <code>Size:Word;</code>
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| Word to keep size even
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|-
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| <code>RemotePort:Word;</code>
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| &nbsp;
 +
|-
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| <code>Next:PUDPDatagram;</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 ===
 +
----
 +
 
 +
 
 +
'''UDP specific classes'''
 +
 
 +
{| class="wikitable" style="font-size: 14px; text-align: left; width: 100%; height: 50px;"
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|-
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| [[TUDPProtocolTransport|<code>TUDPProtocolTransport = 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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| [[TUDPProtocol|<code>TUDPProtocol = 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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| [[TUDPSocket|<code>TUDPSocket = 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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| [[TUDPState|<code>TUDPState = class(TProtocolState)</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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| [[TUDPBuffer|<code>TUDPBuffer = class(TSocketBuffer)</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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| [[TUDPOptions|<code>TUDPOptions = class(TProtocolOptions)</code>]]
 +
|-
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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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'''Initialization Functions'''
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'''Initialization functions'''
  
 
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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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! '''Note'''
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! Note
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| If checksum is zero then no checksum was added, return True
+
| If checksum is zero then no checksum was added, return True.
 
|-
 
|-
 
|}
 
|}
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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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|-
 
|-
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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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! '''Note'''
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! Note
 
| None documented
 
| None documented
 
|-
 
|-
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|-
 
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! '''Note'''
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! Note
 
| None documented
 
| None documented
 
|-
 
|-

Latest revision as of 05:33, 31 August 2021

Return to Unit Reference


Description

Ultibo UDP (User Datagram Protocol) unit

Constants


UDP specific constants UDP_*
Note: Some UDP definitions are in the Protocol or IP modules
 
UDP_PROTOCOL_NAME = 'UDP';  
 
MIN_UDP_PACKET = 8; Not Counting Adapter and Transport Header
MAX_UDP_PACKET = 8192; Not Counting Adapter and Transport Header
 
UDP_TIMEOUT = 0; Wait forever on a UDP Read
UDP_BUFFER_SIZE = 65536; UDP Receive Buffer Size
 
UDP_MAX_PORT = 65536;  
 
UDP_HEADER_SIZE = 8; SizeOf(TUDPHeader);
 
UDP_DATAGRAM_SIZE = 8; SizeOf(TUDPDatagram)


UDP socket option
See Sockets.pas


UDP port UDP_PORT_*
UDP_PORT_START = 49152; First dynamic port (Previously 1024) As per IANA assignment
UDP_PORT_STOP = 65534; Last dynamic port (Previously 5000) Short of IANA assignment to allow for rollover


Type definitions


UDP header

PUDPHeader = ^TUDPHeader;

TUDPHeader = packed record

Note: Some UDP definitions are in the Protocol or IP modules
Note: 8 Bytes
SourcePort:Word; Network Order
DestPort:Word; Network Order
Length:Word; Network Order
Checksum:Word;  

UDP datagram

PUDPDatagram = ^TUDPDatagram;

TUDPDatagram = record

Note: 8 Bytes (Used by UDPBuffer)
Size:Word; Word to keep size even
RemotePort:Word;  
Next:PUDPDatagram; Followed by RemoteAddress (4 or 16 Bytes)


Class definitions


UDP specific classes

TUDPProtocolTransport = class(TProtocolTransport)
TUDPProtocol = class(TNetworkProtocol)
TUDPSocket = class(TProtocolSocket)
TUDPState = class(TProtocolState)
TUDPBuffer = class(TSocketBuffer)
TUDPOptions = class(TProtocolOptions)


Public variables

None defined

Function declarations


Initialization functions 

procedure UDPInit;
Description: To be documented
Note None documented


UDP functions 

function CheckUDP(AFamily:Word; ABuffer:Pointer):Boolean;
Description: Verify that the packet is a valid UDP packet
Buffer The complete packet including Transport header
Note If checksum is zero then no checksum was added, return True. 


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


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


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


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


function ChecksumUDPRecv(AFamily:Word; APseudo:PIPPseudo; ABuffer:Pointer; AOffset,ALength:Word):Word;
Description: Validate the Checksum of UDP Pseudo, Header and Data on Receive
Note None documented 


function ChecksumUDPSend(AFamily:Word; APseudo:PIPPseudo; AHeader:PUDPHeader; AData:Pointer; ALength:Word):Word;
Description: Checksum the UDP Pseudo, Header and Data on Send
Note None documented


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