Difference between revisions of "Unit UDP"
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'''Ultibo UDP (User Datagram Protocol) unit''' | '''Ultibo UDP (User Datagram Protocol) unit''' | ||
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=== Constants === | === Constants === | ||
Latest revision as of 05:33, 31 August 2021
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Contents
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';
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MIN_UDP_PACKET = 8;
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Not Counting Adapter and Transport Header |
MAX_UDP_PACKET = 8192;
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Not Counting Adapter and Transport Header |
UDP_TIMEOUT = 0;
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Wait forever on a UDP Read |
UDP_BUFFER_SIZE = 65536;
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UDP Receive Buffer Size |
UDP_MAX_PORT = 65536;
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UDP_HEADER_SIZE = 8;
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SizeOf(TUDPHeader); |
UDP_DATAGRAM_SIZE = 8;
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SizeOf(TUDPDatagram) |
UDP socket option
| See Sockets.pas |
UDP port
UDP_PORT_* UDP_PORT_START = 49152;
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First dynamic port (Previously 1024) As per IANA assignment |
UDP_PORT_STOP = 65534;
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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;
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Network Order |
DestPort:Word;
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Network Order |
Length:Word;
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Network Order |
Checksum:Word;
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UDP datagram
PUDPDatagram = ^TUDPDatagram;
TUDPDatagram = record
| Note: 8 Bytes (Used by UDPBuffer) | |
Size:Word;
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Word to keep size even |
RemotePort:Word;
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Next:PUDPDatagram;
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Followed by RemoteAddress (4 or 16 Bytes) |
Class definitions
UDP specific classes
TUDPProtocolTransport = class(TProtocolTransport)
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TUDPProtocol = class(TNetworkProtocol)
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TUDPSocket = class(TProtocolSocket)
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TUDPState = class(TProtocolState)
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TUDPBuffer = class(TSocketBuffer)
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TUDPOptions = class(TProtocolOptions)
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Public variables
None defined
Function declarations
Initialization functions
procedure UDPInit;
Description: To be documented
| Note | None documented |
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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 |
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| 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 |
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function GetUDPHeaderLength(AFamily:Word; ABuffer:Pointer):Word;
Description: To be documented
| Buffer | The complete packet including Transport header |
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function GetUDPDataOffset(AFamily:Word; ABuffer:Pointer):Word;
Description: To be documented
| Buffer | The complete packet including Transport header |
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function GetUDPDataLength(AFamily:Word; ABuffer:Pointer):Word;
Description: To be documented
| Buffer | The complete packet including Transport header |
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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 |
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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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