Difference between revisions of "TUDPProtocol"

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=== Class definitions ===
 
=== Class definitions ===
 
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Latest revision as of 01:32, 31 May 2018

Return to Unit UDP


Description

To be documented

Class definitions


TUDPProtocol = class(TNetworkProtocol)

constructor Create(AManager:TProtocolManager; const AName:String);  
destructor Destroy; override;  
private
FNextPort:Word;  
private
function PacketHandler(AHandle:THandle; ASource,ADest,APacket:Pointer; ASize:Integer; ABroadcast:Boolean):Boolean;  
protected
function OpenPort(ASocket:TProtocolSocket; APort:Word):Boolean; override;  
function ClosePort(ASocket:TProtocolSocket):Boolean; override;  
function FindPort(APort:Word; AWrite,ALock:Boolean):TProtocolPort; override;  
 
function SelectCheck(ASource,ADest:PFDSet; ACode:Integer):Integer; override;  
function SelectWait(ASocket:TProtocolSocket; ACode:Integer; ATimeout:LongWord):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 AddTransport(ATransport:TNetworkTransport):Boolean; override;  
function RemoveTransport(ATransport:TNetworkTransport):Boolean; 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 StartProtocol:Boolean; override;  
function StopProtocol:Boolean; override;  
function ProcessProtocol:Boolean; override;  


Function declarations


constructor TUDPProtocol.Create(AManager:TProtocolManager; const AName:String);
Description: To be documented
Note None documented 


destructor TUDPProtocol.Destroy;
Description: To be documented
Note None documented 


function TUDPProtocol.PacketHandler(AHandle:THandle; ASource,ADest,APacket:Pointer; ASize:Integer; ABroadcast:Boolean):Boolean;
Description: Process a packet received by a Transport
Handle The Handle of the Protocol Transport the packet was received from
Source The source address of the received packet (Set by Transport)
Dest The destination address of the received packet (Set by Transport)
Packet The received packet (The complete packet including Transport header)
Size The size of the received packet in bytes
Broadcast True if the destination address is a broadcast address 


function TUDPProtocol.OpenPort(ASocket:TProtocolSocket; APort:Word):Boolean;
Description: To be documented
Note Caller must hold the Socket lock 


function TUDPProtocol.ClosePort(ASocket:TProtocolSocket):Boolean;
Description: To be documented
Note Caller must hold the Socket lock 


function TUDPProtocol.FindPort(APort:Word; AWrite,ALock:Boolean):TProtocolPort;
Description: Find a protocol port for the specified port number
Port The port number to find
Write If True then use the writer lock
Lock If True then lock the found entry before returning 


function TUDPProtocol.SelectCheck(ASource,ADest:PFDSet; ACode:Integer):Integer;
Description: To be documented
Source Source is the working set to check
Dest Dest is the set passed to Select 


function TUDPProtocol.SelectWait(ASocket:TProtocolSocket; ACode:Integer; ATimeout:LongWord):Integer;
Description: To be documented
Socket Socket is the single socket to check
Code Code is the type of check
Timeout Timeout is how long to wait 


function TUDPProtocol.SendPacket(ASocket:TProtocolSocket; ASource,ADest:Pointer; ASourcePort,ADestPort:Word; APacket:PPacketFragment; ASize,AFlags:Integer):Integer;
Description: Send a Packet by adding the Protocol Header and other details to the Data
Socket The socket to use for sending the packet
Source The source address of the packet (Host Order)
Dest The destination address of the packet (Host Order)
SourcePort The source port of the packet (Host Order)
DestPort The destination port of the packet (Host Order)
Packet The packet data to send
Size The size of the packet data in bytes
Flags Any protocol specific flags for sending
Note Caller must hold the Socket lock 


function TUDPProtocol.Accept(ASocket:TProtocolSocket; ASockAddr:PSockAddr; AAddrLength:PInteger):TProtocolSocket;
Description: BSD compatible Accept
Socket The socket to accept from
SockAddr The socket address (Network Order)
AddrLength The socket address length
Note Caller must hold the Socket lock 


function TUDPProtocol.Bind(ASocket:TProtocolSocket; var ASockAddr:TSockAddr; AAddrLength:Integer):Integer;
Description: BSD compatible Bind
Socket The socket to bind
SockAddr The socket address (Network Order)
AddrLength The socket address length
Note Sets the LocalAddress/Port for future Sends and Receives, Address can be specified as INADDR_ANY which allows Listening or auto assignment. If Port is IPPORT_ANY then a dynamic Port will be assigned.

Caller must hold the Socket lock 


function TUDPProtocol.CloseSocket(ASocket:TProtocolSocket):Integer;
Description: BSD compatible Close Socket
Socket The socket to close
Note Closes and removes the socket, does not perform Linger

Caller must hold the Socket lock 


function TUDPProtocol.Connect(ASocket:TProtocolSocket; var ASockAddr:TSockAddr; AAddrLength:Integer):Integer;
Description: BSD compatible Connect
Socket The socket to connect
SockAddr The socket address (Network Order)
AddrLength The socket address length
Note Sets the RemoteAddress/Port of future Sends and Receives, if Bind has not been called then the LocalAddress/Port will be set appropriately as well based on the route to the RemoteAddress.

Caller must hold the Socket lock 


function TUDPProtocol.IoctlSocket(ASocket:TProtocolSocket; ACmd:DWORD; var AArg:u_long):Integer;
Description: BSD compatible IO Control Socket
Socket The socket to control
Cmd The socket command
Arg The command argument
Note Caller must hold the Socket lock 


function TUDPProtocol.GetPeerName(ASocket:TProtocolSocket; var ASockAddr:TSockAddr; var AAddrLength:Integer):Integer;
Description: BSD compatible Get Peer Name (Remote)
Socket The socket to get from
SockAddr The socket address (Network Order)
AddrLength The socket address length
Note Caller must hold the Socket lock 


function TUDPProtocol.GetSockName(ASocket:TProtocolSocket; var ASockAddr:TSockAddr; var AAddrLength:Integer):Integer;
Description: BSD compatible Get Sock Name (Local)
Socket The socket to get from
SockAddr The socket address (Network Order)
AddrLength The socket address length
Note Caller must hold the Socket lock 


function TUDPProtocol.GetSockOpt(ASocket:TProtocolSocket; ALevel,AOptName:Integer; AOptValue:PChar; var AOptLength:Integer):Integer;
Description: BSD compatible Get Socket Option
Socket The socket to get the option from
Level The protocol level for the option
OptName The name of the option to get
OptValue The value of the option
OptLength The length of the option
Note Caller must hold the Socket lock 


function TUDPProtocol.Listen(ASocket:TProtocolSocket; ABacklog:Integer):Integer;
Description: BSD compatible Listen
Socket The socket to listen on
Backlog Queue depth for accepted connections
Note Caller must hold the Socket lock 


function TUDPProtocol.Recv(ASocket:TProtocolSocket; var ABuffer; ALength,AFlags:Integer):Integer;
Description: BSD compatible Receive
Socket The socket to receive from
Buffer Buffer for received data
Length Length of buffer in bytes
Flags Protocol specific receive flags
Note Caller must hold the Socket lock 


function TUDPProtocol.RecvFrom(ASocket:TProtocolSocket; var ABuffer; ALength,AFlags:Integer; var AFromAddr:TSockAddr; var AFromLength:Integer):Integer;
Description: BSD compatible Receive From
Socket The socket to receive from
Buffer Buffer for received data
Length Length of buffer in bytes
Flags Protocol specific receive flags
FromAddr The address the data was received from (Network Order)
FromLength The length of the address
Note Caller must hold the Socket lock 


function TUDPProtocol.Send(ASocket:TProtocolSocket; var ABuffer; ALength,AFlags:Integer):Integer;
Description: BSD compatible Send
Socket The socket to send to
Buffer Buffer for data to send
Length Length of buffer in bytes
Flags Protocol specific send flags
Note Caller must hold the Socket lock 


function TUDPProtocol.SendTo(ASocket:TProtocolSocket; var ABuffer; ALength,AFlags:Integer; var AToAddr:TSockAddr; AToLength:Integer):Integer;
Description: BSD compatible Send To
Socket The socket to send to
Buffer Buffer for data to send
Length Length of buffer in bytes
Flags Protocol specific send flags
ToAddr The socket address to send to (Network Order)
ToLength The length of the socket address
Note Caller must hold the Socket lock 


function TUDPProtocol.SetSockOpt(ASocket:TProtocolSocket; ALevel,AOptName:Integer; AOptValue:PChar; AOptLength:Integer):Integer;
Description: BSD compatible Set Socket Option
Socket The socket to set the option for
Level The protocol level for the option
OptName The name of the option to set
OptValue The value of the option
OptLength The length of the option
Note Caller must hold the Socket lock 


function TUDPProtocol.Shutdown(ASocket:TProtocolSocket; AHow:Integer):Integer;
Description: BSD compatible Shutdown
Socket The socket to shutdown
How The direction to shutdown the socket
Note Shutdown does not result in CloseSocket so Closed must not get set

Caller must hold the Socket lock 


function TUDPProtocol.Socket(AFamily,AStruct,AProtocol:Integer):TProtocolSocket;
Description: BSD compatible Socket (Create a new socket)
Family Socket address family (eg AF_INET)
Struct Socket type (eg SOCK_DGRAM)
Protocol Socket protocol (eg IPPROTO_UDP) 


function TUDPProtocol.AddTransport(ATransport:TNetworkTransport):Boolean;
Description: Add a transport to this protocol
Transport The transport to add 


function TUDPProtocol.RemoveTransport(ATransport:TNetworkTransport):Boolean;
Description: Remove a transport from this protocol
Transport The transport to remove 


function TUDPProtocol.FindSocket(AFamily,AStruct,AProtocol:Word; ALocalAddress,ARemoteAddress:Pointer; ALocalPort,ARemotePort:Word; ABroadcast,AListen,ALock:Boolean; AState:LongWord):TProtocolSocket;
Description: Find a protocol socket based on all relevant parameters
Family Socket address family (eg AF_INET)
Struct Socket type (eg SOCK_DGRAM)
Protocol Socket protocol (eg IPPROTO_UDP)
LocalAddress Local transport address to match (Host Order)
RemoteAddress Remote transport address to match (Host Order)
LocalPort Local port to match (Host Order)
RemotePort Remote port to match (Host Order)
Broadcast If True then match broadcast addresses
Listen If True then match only listening sockets
Lock If True then lock the found entry before returning 


procedure TUDPProtocol.FlushSockets(All:Boolean);
Description: Flush sockets from the socket cache
All If True flush all sockets, otherwise flush expired sockets. 


function TUDPProtocol.StartProtocol:Boolean;
Description: Start this protocol ready for sending and receiving
Note None documented 


function TUDPProtocol.StopProtocol:Boolean;
Description: Stop this protocol ready for removal
Note None documented 


function TUDPProtocol.ProcessProtocol:Boolean;
Description: Process periodic tasks for this protocol
Note None documented


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