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Description
Ultibo UDP (User Datagram Protocol) unit
To be documented
Constants
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UDP specific constants UDP_*
| Note: Some UDP definitions are in the Protocol or IP modules
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UDP_PROTOCOL_NAME = 'UDP';
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MIN_UDP_PACKET = 8;
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Not Counting Adapter and Transport Header
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MAX_UDP_PACKET = 8192;
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Not Counting Adapter and Transport Header
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UDP_TIMEOUT = 0;
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Wait forever on a UDP Read
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UDP_BUFFER_SIZE = 65536;
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UDP Receive Buffer Size
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UDP_MAX_PORT = 65536;
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UDP_HEADER_SIZE = 8;
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SizeOf(TUDPHeader);
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UDP_DATAGRAM_SIZE = 8;
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SizeOf(TUDPDatagram)
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[Expand]
UDP port UDP_PORT_*
UDP_PORT_START = 49152;
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First dynamic port (Previously 1024) As per IANA assignment
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UDP_PORT_STOP = 65534;
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Last dynamic port (Previously 5000) Short of IANA assignment to allow for rollover
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Type definitions
UDP header
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PUDPHeader = ^TUDPHeader;
TUDPHeader = packed record
| Note: Some UDP definitions are in the Protocol or IP modules
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| Note: 8 Bytes
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SourcePort:Word;
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Network Order
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DestPort:Word;
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Network Order
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Length:Word;
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Network Order
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Checksum:Word;
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UDP datagram
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PUDPDatagram = ^TUDPDatagram;
TUDPDatagram = record
| Note: 8 Bytes (Used by UDPBuffer)
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Size:Word;
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Word to keep size even
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RemotePort:Word;
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Next:PUDPDatagram;
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Followed by RemoteAddress (4 or 16 Bytes)
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Class definitions
UDP protocol transport
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TUDPProtocolTransport = class(TProtocolTransport)
UDP protocol
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TUDPProtocol = 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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FNextPort:Word;
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function PacketHandler(AHandle:THandle; ASource,ADest,APacket:Pointer; ASize:Integer; ABroadcast:Boolean):Boolean;
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protected
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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 OpenPort(ASocket:TProtocolSocket; APort:Word):Boolean; override;
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function ClosePort(ASocket:TProtocolSocket):Boolean; override;
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function FindPort(APort:Word; AWrite,ALock:Boolean):TProtocolPort; 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 SelectCheck(ASource,ADest:PFDSet; ACode:Integer):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 StartProtocol:Boolean; override;
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function StopProtocol:Boolean; override;
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function ProcessProtocol:Boolean; override;
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UDP socket
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TUDPSocket = class(TProtocolSocket)
| Note: SOCK_DGRAM
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constructor Create(AProtocol:TNetworkProtocol; ATransport:TNetworkTransport);
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destructor Destroy; override;
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private
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FRecvData:TUDPBuffer;
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public
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property RecvData:TUDPBuffer read FRecvData;
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function GetOption(ALevel,AOptName:Integer; AOptValue:PChar; var AOptLength:Integer):Integer; override;
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function SetOption(ALevel,AOptName:Integer; AOptValue:PChar; AOptLength:Integer):Integer; override;
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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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UDP state
[Expand]
TUDPState = class(TProtocolState)
constructor Create;
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private
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public
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UDP buffer
[Expand]
TUDPBuffer = 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
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FLength:Word;
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Length of RemoteAddress
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FRead:Pointer;
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Pointer to Next Read from Buffer
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FWrite:Pointer;
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Pointer to Next Write to Buffer
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FCount:LongWord;
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Number of Datagrams in Buffer
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FFirst:PUDPDatagram;
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Pointer to First Datagram
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FLast:PUDPDatagram;
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Pointer to Last Datagram
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function AddDatagram(ASize:Integer):Boolean;
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function RemoveDatagram:Boolean;
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procedure FlushDatagrams;
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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; ARemotePort:PWORD; AFlags:Integer):Boolean;
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function WriteBuffer(var ABuffer; ASize:Integer; ARemoteAddress:Pointer; ARemotePort:PWORD):Boolean;
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UDP options
[Expand]
TUDPOptions = class(TProtocolOptions)
| Note: For Get/Set Options Level = IPPROTO_UDP Option = ????
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constructor Create;
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private
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FOptions:LongWord;
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function GetNoChecksum:Boolean;
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procedure SetNoChecksum(ANoChecksum:Boolean);
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public
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property NoChecksum:Boolean read GetNoChecksum write SetNoChecksum;
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Public variables
None defined
Function declarations
Initialization functions
[Expand]
procedure UDPInit;
Description: To be documented
UDP functions
[Expand]
function CheckUDP(AFamily:Word; ABuffer:Pointer):Boolean;
Description: Verify that the packet is a valid UDP packet
| Buffer
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The complete packet including Transport header
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| Note
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If checksum is zero then no checksum was added, return True
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[Expand]
function GetUDPHeaderOffset(AFamily:Word; ABuffer:Pointer):Word;
Description: To be documented
| Buffer
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The complete packet including Transport header
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[Expand]
function GetUDPHeaderLength(AFamily:Word; ABuffer:Pointer):Word;
Description: To be documented
| Buffer
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The complete packet including Transport header
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[Expand]
function GetUDPDataOffset(AFamily:Word; ABuffer:Pointer):Word;
Description: To be documented
| Buffer
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The complete packet including Transport header
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[Expand]
function GetUDPDataLength(AFamily:Word; ABuffer:Pointer):Word;
Description: To be documented
| Buffer
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The complete packet including Transport header
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[Expand]
function ChecksumUDPRecv(AFamily:Word; APseudo:PIPPseudo; ABuffer:Pointer; AOffset,ALength:Word):Word;
Description: Validate the Checksum of UDP Pseudo, Header and Data on Receive
[Expand]
function ChecksumUDPSend(AFamily:Word; APseudo:PIPPseudo; AHeader:PUDPHeader; AData:Pointer; ALength:Word):Word;
Description: Checksum the UDP Pseudo, Header and Data on Send
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