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{
This file is part of the Free Component Library (FCL)
Copyright (c) 1999-2000 by the Free Pascal development team
See the file COPYING.FPC, included in this distribution,
for details about the copyright.
This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
**********************************************************************}
{$MODE objfpc}
unit ssockets;
interface
uses
SysUtils, Classes, sockets;
type
TSocketErrorType = (
seHostNotFound,
seCreationFailed,
seBindFailed,
seListenFailed,
seConnectFailed,
seAcceptFailed,
seAcceptWouldBlock);
TSocketOption = (soDebug,soReuseAddr,soKeepAlive,soDontRoute,soBroadcast,
soOOBinline);
TSocketOptions = Set of TSocketOption;
ESocketError = class(Exception)
Code: TSocketErrorType;
constructor Create(ACode: TSocketErrorType; const MsgArgs: array of const);
end;
TSocketStream = class(THandleStream)
Private
FSocketOptions : TSocketOptions;
Procedure GetSockOptions;
Procedure SetSocketOptions(Value : TSocketOptions);
function GetLocalAddress: TSockAddr;
function GetRemoteAddress: TSockAddr;
Public
Constructor Create (AHandle : Longint);virtual;
destructor Destroy; override;
function Seek(Offset: Longint; Origin: Word): Longint; override;
Function Read (Var Buffer; Count : Longint) : longint; Override;
Function Write (Const Buffer; Count : Longint) :Longint; Override;
Property SocketOptions : TSocketOptions Read FSocketOptions
Write SetSocketOptions;
property LocalAddress: TSockAddr read GetLocalAddress;
property RemoteAddress: TSockAddr read GetRemoteAddress;
end;
TConnectEvent = Procedure (Sender : TObject; Data : TSocketStream) Of Object;
TConnectQuery = Procedure (Sender : TObject; ASocket : Longint; Var Allow : Boolean) of Object;
{ TSocketServer }
TSocketServer = Class(TObject)
Private
FOnIdle : TNotifyEvent;
FNonBlocking : Boolean;
FSocket : longint;
FListened : Boolean;
FAccepting : Boolean;
FMaxConnections : Longint;
FQueueSize : Longint;
FOnConnect : TConnectEvent;
FOnConnectQuery : TConnectQuery;
Procedure DoOnIdle;
Protected
FSockType : Longint;
FBound : Boolean;
Procedure DoConnect(ASocket : TSocketStream); Virtual;
Function DoConnectQuery(ASocket : longint): Boolean ;Virtual;
Procedure Bind; Virtual; Abstract;
Function Accept: Longint;Virtual;Abstract;
Function SockToStream (ASocket : Longint) : TSocketStream;Virtual;Abstract;
Procedure Close; Virtual;
Public
Constructor Create(ASocket : Longint);
Destructor Destroy; Override;
Procedure Listen;
Procedure StartAccepting;
Procedure StopAccepting;
Procedure SetNonBlocking;
Property Bound : Boolean Read FBound;
Property MaxConnections : longint Read FMaxConnections Write FMaxConnections;
Property QueueSize : Longint Read FQueueSize Write FQueueSize default 5;
Property OnConnect : TConnectEvent Read FOnConnect Write FOnConnect;
Property OnConnectQuery : TConnectQuery Read FOnConnectQuery Write FOnConnectQuery;
Property OnIdle : TNotifyEvent Read FOnIdle Write FOnIdle;
Property NonBlocking : Boolean Read FNonBlocking;
Property Socket : Longint Read FSocket;
Property SockType : Longint Read FSockType;
end;
{ TInetServer }
TInetServer = Class(TSocketServer)
Protected
FAddr : TINetSockAddr;
Function SockToStream (ASocket : Longint) : TSocketStream;Override;
Function Accept : Longint;override;
FPort : Word;
FHost: string;
Public
Procedure Bind; Override;
Constructor Create(APort: Word);
Constructor Create(const aHost: string; const APort: Word);
Property Port : Word Read FPort;
Property Host : string Read FHost;
end;
{$ifdef Unix}
{ TUnixServer }
TUnixServer = Class(TSocketServer)
Private
FUnixAddr : TUnixSockAddr;
FFileName : String;
Protected
Procedure Bind; Override;
Function Accept : Longint;override;
Function SockToStream (ASocket : Longint) : TSocketStream;Override;
Procedure Close; override;
Public
Constructor Create(AFileName : String);
Property FileName : String Read FFileName;
end;
{$endif}
TInetSocket = Class(TSocketStream)
Private
FHost : String;
FPort : Word;
Protected
Procedure DoConnect(ASocket : longint); Virtual;
Public
Constructor Create(ASocket : longint); Override; Overload;
Constructor Create(const AHost: String; APort: Word); Overload;
Property Host : String Read FHost;
Property Port : Word Read FPort;
end;
{$ifdef Unix}
TUnixSocket = Class(TSocketStream)
Private
FFileName : String;
Protected
Procedure DoConnect(ASocket : longint); Virtual;
Public
Constructor Create(ASocket : Longint); Overload;
Constructor Create(AFileName : String); Overload;
Property FileName : String Read FFileName;
end;
{$endif}
Implementation
uses
{$ifdef unix}
BaseUnix, Unix,
{$endif}
resolve;
Const
SocketWouldBlock = -2;
{ ---------------------------------------------------------------------
ESocketError
---------------------------------------------------------------------}
resourcestring
strHostNotFound = 'Host name resolution for "%s" failed.';
strSocketCreationFailed = 'Creation of socket failed: %s';
strSocketBindFailed = 'Binding of socket failed: %s';
strSocketListenFailed = 'Listening on port #%d failed, error: %d';
strSocketConnectFailed = 'Connect to %s failed.';
strSocketAcceptFailed = 'Could not accept a client connection on socket: %d, error %d';
strSocketAcceptWouldBlock = 'Accept would block on socket: %d';
constructor ESocketError.Create(ACode: TSocketErrorType; const MsgArgs: array of const);
var
s: String;
begin
Code := ACode;
case ACode of
seHostNotFound : s := strHostNotFound;
seCreationFailed: s := strSocketCreationFailed;
seBindFailed : s := strSocketBindFailed;
seListenFailed : s := strSocketListenFailed;
seConnectFailed : s := strSocketConnectFailed;
seAcceptFailed : s := strSocketAcceptFailed;
seAcceptWouldBLock : S:= strSocketAcceptWouldBlock;
end;
s := Format(s, MsgArgs);
inherited Create(s);
end;
{ ---------------------------------------------------------------------
TSocketStream
---------------------------------------------------------------------}
Constructor TSocketStream.Create (AHandle : Longint);
begin
Inherited Create(AHandle);
GetSockOptions;
end;
destructor TSocketStream.Destroy;
begin
{$ifdef netware}
CloseSocket(Handle);
{$else}
FileClose(Handle);
{$endif}
inherited Destroy;
end;
Procedure TSocketStream.GetSockOptions;
begin
end;
Procedure TSocketStream.SetSocketOptions(Value : TSocketOptions);
begin
end;
Function TSocketStream.Seek(Offset: Longint; Origin: Word): Longint;
begin
Result:=0;
end;
Function TSocketStream.Read (Var Buffer; Count : Longint) : longint;
Var
Flags : longint;
begin
Flags:=0;
Result:=recv(handle,Buffer,count,flags);
end;
Function TSocketStream.Write (Const Buffer; Count : Longint) :Longint;
Var
Flags : longint;
begin
Flags:=0;
Result:=send(handle,Buffer,count,flags);
end;
function TSocketStream.GetLocalAddress: TSockAddr;
var
len: LongInt;
begin
len := SizeOf(TSockAddr);
if GetSocketName(Handle, Result, len) <> 0 then
FillChar(Result, SizeOf(Result), 0);
end;
function TSocketStream.GetRemoteAddress: TSockAddr;
var
len: LongInt;
begin
len := SizeOf(TSockAddr);
if GetPeerName(Handle, Result, len) <> 0 then
FillChar(Result, SizeOf(Result), 0);
end;
{ ---------------------------------------------------------------------
TSocketServer
---------------------------------------------------------------------}
Constructor TSocketServer.Create(ASocket : Longint);
begin
FSocket:=ASocket;
FQueueSize :=5;
end;
Destructor TSocketServer.Destroy;
begin
Close;
end;
Procedure TSocketServer.Close;
begin
If FSocket<>-1 Then
{$ifdef netware}
CloseSocket(FSocket);
{$else}
FileClose(FSocket);
{$endif}
FSocket:=-1;
end;
Procedure TSocketServer.Listen;
begin
If Not FBound then
Bind;
If Not Sockets.Listen(FSocket,FQueueSize) then
Raise ESocketError.Create(seListenFailed,[FSocket,SocketError]);
end;
Procedure TSocketServer.StartAccepting;
Var
NoConnections,
NewSocket : longint;
Stream : TSocketStream;
begin
FAccepting := True;
Listen;
Repeat
Repeat
Try
NewSocket:=Accept;
If NewSocket>=0 then
begin
Inc (NoConnections);
If DoConnectQuery(NewSocket) Then
begin
Stream:=SockToStream(NewSocket);
DoConnect(Stream);
end
end
except
On E : ESocketError do
begin
If E.Code=seAcceptWouldBlock then
begin
DoOnIdle;
NewSocket:=-1;
end
else
Raise;
end;
end;
Until (NewSocket>=0) or (Not NonBlocking);
Until Not (FAccepting) or ((FMaxConnections<>-1) and (NoConnections>=FMaxConnections));
end;
Procedure TSocketServer.StopAccepting;
begin
FAccepting:=False;
end;
Procedure TSocketServer.DoOnIdle;
begin
If Assigned(FOnIdle) then
FOnIdle(Self);
end;
Procedure TSocketServer.DoConnect(ASocket : TSocketStream);
begin
If Assigned(FOnConnect) Then
FOnConnect(Self,ASocket);
end;
Function TSocketServer.DoConnectQuery(ASocket : Longint) : Boolean;
begin
Result:=True;
If Assigned(FOnConnectQuery) then
FOnConnectQuery(Self,ASocket,Result);
end;
Procedure TSocketServer.SetNonBlocking;
begin
{$ifdef Unix}
fpfcntl(FSocket,F_SETFL,O_NONBLOCK);
{$endif}
FNonBlocking:=True;
end;
{ ---------------------------------------------------------------------
TInetServer
---------------------------------------------------------------------}
Constructor TInetServer.Create(APort: Word);
begin
Create('0.0.0.0', aPort);
end;
Constructor TInetServer.Create(const aHost: string; const APort: Word);
Var S : longint;
begin
FHost:=aHost;
FPort:=APort;
S:=Sockets.Socket(AF_INET,SOCK_STREAM,0);
If S=-1 Then
Raise ESocketError.Create(seCreationFailed,[Format('%d',[APort])]);
Inherited Create(S);
end;
Procedure TInetServer.Bind;
begin
Faddr.family := AF_INET;
Faddr.port := ShortHostToNet(FPort);
Faddr.addr := LongWord(StrToNetAddr(FHost));
if not Sockets.Bind(FSocket, FAddr, Sizeof(FAddr)) then
raise ESocketError.Create(seBindFailed, [IntToStr(FPort)]);
FBound:=True;
end;
Function TInetServer.SockToStream (ASocket : Longint) : TSocketStream;
begin
Result:=TInetSocket.Create(ASocket);
(Result as TInetSocket).FHost:='';
(Result as TInetSocket).FPort:=FPort;
end;
Function TInetServer.Accept : Longint;
Var l : longint;
begin
L:=SizeOf(FAddr);
Result:=Sockets.Accept(Socket,Faddr,L);
If Result<0 then
{$ifdef Unix}
If SocketError=ESysEWOULDBLOCK then
Raise ESocketError.Create(seAcceptWouldBlock,[socket])
else
{$endif}
Raise ESocketError.Create(seAcceptFailed,[Socket,SocketError]);
end;
{ ---------------------------------------------------------------------
TUnixServer
---------------------------------------------------------------------}
{$ifdef Unix}
Constructor TUnixServer.Create(AFileName : String);
Var S : Longint;
begin
FFileName:=AFileName;
S:=Sockets.Socket(AF_UNIX,SOCK_STREAM,0);
If S=-1 then
Raise ESocketError.Create(seCreationFailed,[AFileName])
else
Inherited Create(S);
end;
Procedure TUnixServer.Close;
begin
Inherited Close;
DeleteFile(FFileName);
FFileName:='';
end;
Procedure TUnixServer.Bind;
var
AddrLen : longint;
begin
Str2UnixSockAddr(FFilename,FUnixAddr,AddrLen);
If Not Sockets.Bind(Socket,FUnixAddr,AddrLen) then
Raise ESocketError.Create(seBindFailed,[FFileName]);
FBound:=True;
end;
Function TUnixServer.Accept : Longint;
Var L : longint;
begin
L:=Length(FFileName);
Result:=Sockets.Accept(Socket,FUnixAddr,L);
If Result<0 then
If SocketError=ESysEWOULDBLOCK then
Raise ESocketError.Create(seAcceptWouldBlock,[socket])
else
Raise ESocketError.Create(seAcceptFailed,[socket,SocketError]);
end;
Function TUnixServer.SockToStream (ASocket : Longint) : TSocketStream;
begin
Result:=TUnixSocket.Create(ASocket);
(Result as TUnixSocket).FFileName:=FFileName;
end;
{$endif}
{ ---------------------------------------------------------------------
TInetSocket
---------------------------------------------------------------------}
Constructor TInetSocket.Create(ASocket : Longint);
begin
Inherited Create(ASocket);
end;
Constructor TInetSocket.Create(const AHost: String; APort: Word);
Var
S : Longint;
begin
FHost:=AHost;
FPort:=APort;
S:=Socket(AF_INET,SOCK_STREAM,0);
DoConnect(S);
Inherited Create(S);
end;
Procedure TInetSocket.DoConnect(ASocket : Longint);
Var
TheHost: THostResolver;
A : THostAddr;
addr: TInetSockAddr;
begin
A := StrToNetAddr(FHost);
if A.s_bytes[4] = 0 then
With THostResolver.Create(Nil) do
try
If Not NameLookup(FHost) then
raise ESocketError.Create(seHostNotFound, [FHost]);
A:=HostAddress;
finally
free;
end;
addr.family := AF_INET;
addr.port := ShortHostToNet(FPort);
addr.addr := hosttonet(a.s_addr); // hosttonet(A).s_addr;
//Cardinal(A);
If not Sockets.Connect(ASocket, addr, sizeof(addr)) then
raise ESocketError.Create(seConnectFailed, [Format('%s:%d',[FHost, FPort])]);
end;
{ ---------------------------------------------------------------------
TUnixSocket
---------------------------------------------------------------------}
{$ifdef Unix}
Constructor TUnixSocket.Create(ASocket : Longint);
begin
Inherited Create(ASocket);
end;
Constructor TUnixSocket.Create(AFileName : String);
Var S : Longint;
begin
FFileName:=AFileName;
S:=Socket(AF_UNIX,SOCK_STREAM,0);
DoConnect(S);
Inherited Create(S);
end;
Procedure TUnixSocket.DoConnect(ASocket : longint);
Var
UnixAddr : TUnixSockAddr;
AddrLen : longint;
begin
Str2UnixSockAddr(FFilename,UnixAddr,AddrLen);
If Not Connect(ASocket,UnixAddr,AddrLen) then
Raise ESocketError.Create(seConnectFailed,[FFilename]);
end;
{$endif}
end.
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