Difference between revisions of "Unit UDP"
From Ultibo.org
| Line 60: | Line 60: | ||
<br /> | <br /> | ||
<div class="toccolours mw-collapsible mw-collapsed" style="border: 1; font-family: arial; padding-top: 20px; padding-bottom: 15px;"> | <div class="toccolours mw-collapsible mw-collapsed" style="border: 1; font-family: arial; padding-top: 20px; padding-bottom: 15px;"> | ||
| − | <div style="font-size: 14px; padding-left: 12px;">'''UDP socket option | + | <div style="font-size: 14px; padding-left: 12px;">'''UDP socket option'''</div> |
<div class="mw-collapsible-content" style="text-align: left; padding-left: 5px;"> | <div class="mw-collapsible-content" style="text-align: left; padding-left: 5px;"> | ||
{| class="wikitable" style="font-size: 14px; background: white;" | {| class="wikitable" style="font-size: 14px; background: white;" | ||
| Line 70: | Line 70: | ||
<br /> | <br /> | ||
<div class="toccolours mw-collapsible mw-collapsed" style="border: 1; font-family: arial; padding-top: 20px; padding-bottom: 15px;"> | <div class="toccolours mw-collapsible mw-collapsed" style="border: 1; font-family: arial; padding-top: 20px; padding-bottom: 15px;"> | ||
| − | <div style="font-size: 14px; padding-left: 12px;">'''UDP port | + | <div style="font-size: 14px; padding-left: 12px;">'''UDP port''' <code> UDP_PORT_* </code></div> |
<div class="mw-collapsible-content" style="text-align: left; padding-left: 5px;"> | <div class="mw-collapsible-content" style="text-align: left; padding-left: 5px;"> | ||
{| class="wikitable" style="font-size: 14px; background: white;" | {| class="wikitable" style="font-size: 14px; background: white;" | ||
Revision as of 04:44, 27 March 2017
Return to Unit Reference
Contents
Description
Ultibo UDP (User Datagram Protocol) unit
To be documented
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 protocol transport
TUDPProtocolTransport = class(TProtocolTransport)
private
| |
public
| |
UDP protocol
TUDPProtocol = class(TNetworkProtocol)
constructor Create(AManager:TProtocolManager; const AName:String);
|
|
destructor Destroy; override;
|
|
private
| |
FNextPort:Word;
|
|
function PacketHandler(AHandle:THandle; ASource,ADest,APacket:Pointer; ASize:Integer; ABroadcast:Boolean):Boolean;
|
|
protected
| |
function AddTransport(ATransport:TNetworkTransport):Boolean; override;
|
|
function RemoveTransport(ATransport:TNetworkTransport):Boolean; override;
|
|
function OpenPort(ASocket:TProtocolSocket; APort:Word):Boolean; override;
|
|
function ClosePort(ASocket:TProtocolSocket):Boolean; override;
|
|
function FindPort(APort:Word; AWrite,ALock:Boolean):TProtocolPort; override;
|
|
function FindSocket(AFamily,AStruct,AProtocol:Word; ALocalAddress,ARemoteAddress:Pointer; ALocalPort,ARemotePort:Word; ABroadcast,AListen,ALock:Boolean; AState:LongWord):TProtocolSocket; override;
|
|
procedure FlushSockets(All:Boolean); override;
|
|
function SelectCheck(ASource,ADest:PFDSet; ACode:Integer):Integer; override;
|
|
function SendPacket(ASocket:TProtocolSocket; ASource,ADest:Pointer; ASourcePort,ADestPort:Word; APacket:PPacketFragment; ASize,AFlags:Integer):Integer; override;
|
|
public
| |
function Accept(ASocket:TProtocolSocket; ASockAddr:PSockAddr; AAddrLength:PInteger):TProtocolSocket; override;
|
|
function Bind(ASocket:TProtocolSocket; var ASockAddr:TSockAddr; AAddrLength:Integer):Integer; override;
|
|
function CloseSocket(ASocket:TProtocolSocket):Integer; override;
|
|
function Connect(ASocket:TProtocolSocket; var ASockAddr:TSockAddr; AAddrLength:Integer):Integer; override;
|
|
function IoctlSocket(ASocket:TProtocolSocket; ACmd:DWORD; var AArg:u_long):Integer; override;
|
|
function GetPeerName(ASocket:TProtocolSocket; var ASockAddr:TSockAddr; var AAddrLength:Integer):Integer; override;
|
|
function GetSockName(ASocket:TProtocolSocket; var ASockAddr:TSockAddr; var AAddrLength:Integer):Integer; override;
|
|
function GetSockOpt(ASocket:TProtocolSocket; ALevel,AOptName:Integer; AOptValue:PChar; var AOptLength:Integer):Integer; override;
|
|
function Listen(ASocket:TProtocolSocket; ABacklog:Integer):Integer; override;
|
|
function Recv(ASocket:TProtocolSocket; var ABuffer; ALength,AFlags:Integer):Integer; override;
|
|
function RecvFrom(ASocket:TProtocolSocket; var ABuffer; ALength,AFlags:Integer; var AFromAddr:TSockAddr; var AFromLength:Integer):Integer; override;
|
|
function Select(ANfds:Integer; AReadfds,AWritefds,AExceptfds:PFDSet; ATimeout:PTimeVal):LongInt; override;
|
|
function Send(ASocket:TProtocolSocket; var ABuffer; ALength,AFlags:Integer):Integer; override;
|
|
function SendTo(ASocket:TProtocolSocket; var ABuffer; ALength,AFlags:Integer; var AToAddr:TSockAddr; AToLength:Integer):Integer; override;
|
|
function SetSockOpt(ASocket:TProtocolSocket; ALevel,AOptName:Integer; AOptValue:PChar; AOptLength:Integer):Integer; override;
|
|
function Shutdown(ASocket:TProtocolSocket; AHow:Integer):Integer; override;
|
|
function Socket(AFamily,AStruct,AProtocol:Integer):TProtocolSocket; override;
|
|
function StartProtocol:Boolean; override;
|
|
function StopProtocol:Boolean; override;
|
|
function ProcessProtocol:Boolean; override;
|
|
UDP socket
TUDPSocket = class(TProtocolSocket)
| Note: SOCK_DGRAM | |
constructor Create(AProtocol:TNetworkProtocol; ATransport:TNetworkTransport);
|
|
destructor Destroy; override;
|
|
private
| |
FRecvData:TUDPBuffer;
|
|
public
| |
property RecvData:TUDPBuffer read FRecvData;
|
|
function GetOption(ALevel,AOptName:Integer; AOptValue:PChar; var AOptLength:Integer):Integer; override;
|
|
function SetOption(ALevel,AOptName:Integer; AOptValue:PChar; AOptLength:Integer):Integer; override;
|
|
function IoCtl(ACommand:DWORD; var AArgument:u_long):Integer; override;
|
|
function IsConnected(ALocalAddress,ARemoteAddress:Pointer; ALocalPort,ARemotePort:Word; ABroadcast:Boolean):Boolean; override;
|
|
function IsListening(ALocalAddress,ARemoteAddress:Pointer; ALocalPort,ARemotePort:Word; ABroadcast:Boolean):Boolean; override;
|
|
UDP state
TUDPState = class(TProtocolState)
constructor Create;
|
|
private
| |
public
| |
UDP buffer
TUDPBuffer = class(TSocketBuffer)
constructor Create(ASocket:TTransportSocket);
|
|
destructor Destroy; override;
|
|
private
| |
FOffset:Word;
|
Offset to RemoteAddress |
FLength:Word;
|
Length of RemoteAddress |
FRead:Pointer;
|
Pointer to Next Read from Buffer |
FWrite:Pointer;
|
Pointer to Next Write to Buffer |
FCount:LongWord;
|
Number of Datagrams in Buffer |
FFirst:PUDPDatagram;
|
Pointer to First Datagram |
FLast:PUDPDatagram;
|
Pointer to Last Datagram |
function AddDatagram(ASize:Integer):Boolean;
|
|
function RemoveDatagram:Boolean;
|
|
procedure FlushDatagrams;
|
|
protected
| |
procedure SetSize(ASize:LongWord); override;
|
|
public
| |
function GetNext:Integer;
|
|
function GetCount:LongWord;
|
|
function ReadBuffer(var ABuffer; var ASize:Integer; ARemoteAddress:Pointer; ARemotePort:PWORD; AFlags:Integer):Boolean;
|
|
function WriteBuffer(var ABuffer; ASize:Integer; ARemoteAddress:Pointer; ARemotePort:PWORD):Boolean;
|
|
UDP options
TUDPOptions = class(TProtocolOptions)
| Note: For Get/Set Options Level = IPPROTO_UDP Option = ???? | |
constructor Create;
|
|
private
| |
FOptions:LongWord;
|
|
function GetNoChecksum:Boolean;
|
|
procedure SetNoChecksum(ANoChecksum:Boolean);
|
|
public
| |
property NoChecksum:Boolean read GetNoChecksum write SetNoChecksum;
|
|
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 |
|---|
Return to Unit Reference
