idstacklinux.pas

delphi indy9.0.18组件包

function TIdStackLinux.WSSendTo(ASocket: TIdStackSocketHandle;
  var ABuffer; const ABufferLength, AFlags: Integer; const AIP: string;
  const APort: integer): Integer;

var
  Addr: SockAddr;

begin
  FillChar(Addr, SizeOf(Addr), 0);
  with Addr do
  begin
    sin_family := Id_PF_INET;
    TranslateStringToTInAddr(AIP, sin_addr);
    sin_port := HToNs(APort);
  end;
  Result := SendTo(ASocket, ABuffer, ABufferLength, AFlags or Id_MSG_NOSIGNAL, Addr, SizeOf(Addr));
end;

function TIdStackLinux.WSSetSockOpt(ASocket: TIdStackSocketHandle;
  ALevel, AOptName: Integer; AOptVal: PChar; AOptLen: Integer): Integer;

begin
  Result := SetSockOpt(ASocket, ALevel, AOptName, AOptVal, AOptLen);
end;

function TIdStackLinux.WSGetLastError: Integer;
begin
  Result := System.GetLastError;
  if Result = Id_WSAEPIPE then
  begin
    Result := Id_WSAECONNRESET;
  end;
end;

function TIdStackLinux.WSSocket(AFamily, AStruct, AProtocol: Integer): TIdStackSocketHandle;
begin
  Result := Socket(AFamily, AStruct, AProtocol);
end;

function TIdStackLinux.WSHToNs(AHostShort: Word): Word;
begin
  Result := HToNs(AHostShort);
end;

function TIdStackLinux.WSNToHs(ANetShort: Word): Word;
begin
  Result := NToHs(ANetShort);
end;

function TIdStackLinux.WSGetLocalAddresses: TStrings;
begin
  if FLocalAddresses = nil then
  begin
    FLocalAddresses := TStringList.Create;
  end;
  PopulateLocalAddresses;
  Result := FLocalAddresses;
end;

function TIdStackLinux.WSGetServByName(const AServiceName: string): Integer;
var
  ps: PServEnt;

begin
  ps := GetServByName(PChar(AServiceName), nil);
  if ps <> nil then begin
    Result := Ntohs(ps^.s_port);
  end else begin
    try
      Result := StrToInt(AServiceName);
    except
      on EConvertError do raise EIdInvalidServiceName.CreateFmt(RSInvalidServiceName, [AServiceName]);
    end;
  end;
end;

function TIdStackLinux.WSGetServByPort(const APortNumber: Integer): TStrings;
var
  ps: PServEnt;
  i: integer;
  p: array of PChar;

begin
  Result := TStringList.Create;
  p := nil;
  try
    ps := GetServByPort(HToNs(APortNumber), nil);
    if ps <> nil then
    begin
      Result.Add(ps^.s_name);
      i := 0;
      p := pointer(ps^.s_aliases);
      while p[i] <> nil do
      begin
        Result.Add(PChar(p[i]));
        inc(i);
      end;
    end;
  except
    Result.Free;
  end;
end;

function TIdStackLinux.WSHToNL(AHostLong: LongWord): LongWord;
begin
  Result := HToNL(AHostLong);
end;

function TIdStackLinux.WSNToHL(ANetLong: LongWord): LongWord;
begin
  Result := NToHL(ANetLong);
end;

procedure TIdStackLinux.PopulateLocalAddresses;
type
  TaPInAddr = Array[0..250] of PInAddr;
  PaPInAddr = ^TaPInAddr;

var
  i: integer;
  AHost: PHostEnt;
  PAdrPtr: PaPInAddr;

begin
  FLocalAddresses.Clear ;
  AHost := GetHostByName(PChar(WSGetHostName));
  if AHost = nil then
  begin
    CheckForSocketError(SOCKET_ERROR);
  end
  else
  begin
    PAdrPtr := PAPInAddr(AHost^.h_addr_list);
    i := 0;
    while PAdrPtr^[i] <> nil do
    begin
      FLocalAddresses.Add(TInAddrToString(PAdrPtr^[I]^));
      Inc(I);
    end;
  end;
end;

function TIdStackLinux.WSGetLocalAddress: string;
begin
  Result := LocalAddresses[0];
end;

procedure TIdStackLinux.TranslateStringToTInAddr(AIP: string; var AInAddr);
begin
  with TInAddr(AInAddr).S_un_b do
  begin
    if not GetIPInfo(AIP, @s_b1, @s_b2, @s_b3, @s_b4) then
    begin
      raise EIdInvalidIPAddress.CreateFmt(RSStackInvalidIP, [AIP]);
    end;
  end;
end;

function TIdStackLinux.WSGetHostByAddr(const AAddress: string): string;
//GetHostByAddr is thread-safe in Linux.  It might not be safe in Solorus or BSD Unix
var
  Host: PHostEnt;
  LAddr: u_long;

begin
  LAddr := inet_addr(PChar(AAddress));
  Host := GetHostByAddr(@LAddr,SizeOf(LAddr),AF_INET);
  if (Host <> nil) then
  begin
    Result := Host^.h_name;
  end
  else
  begin
    RaiseSocketError(h_errno);
  end;
end;

function TIdStackLinux.WSShutdown(ASocket: TIdStackSocketHandle; AHow: Integer): Integer;
begin
  Result := Shutdown(ASocket, AHow);
end;

procedure TIdStackLinux.WSGetPeerName(ASocket: TIdStackSocketHandle;
  var VFamily: Integer; var VIP: string; var VPort: Integer);
var
  i: Cardinal;
  LAddr: TSockAddrIn;

begin
  i := SizeOf(LAddr);
  CheckForSocketError(GetPeerName(ASocket, LAddr, i));
  VFamily := LAddr.sin_family;
  VIP := TInAddrToString(LAddr.sin_addr);
  VPort := Ntohs(LAddr.sin_port);
end;

procedure TIdStackLinux.WSGetSockName(ASocket: TIdStackSocketHandle;
  var VFamily: Integer; var VIP: string; var VPort: Integer);
var
  i: Cardinal;
  LAddr: TSockAddrIn;

begin
  i := SizeOf(LAddr);
  CheckForSocketError(GetSockName(ASocket, LAddr, i));
  VFamily := LAddr.sin_family;
  VIP := TInAddrToString(LAddr.sin_addr);
  VPort := Ntohs(LAddr.sin_port);
end;

function TIdStackLinux.WSGetSockOpt(ASocket: TIdStackSocketHandle; Alevel, AOptname: Integer; AOptval: PChar; var AOptlen: Integer): Integer;
begin
  Result := libc.GetSockOpt(ASocket, ALevel, AOptname, AOptval, Cardinal(AOptlen));
end;

{ TIdSocketListLinux }

procedure TIdSocketListLinux.Add(AHandle: TIdStackSocketHandle);
Begin
  FD_SET(AHandle, FFDSet);
  FMaxHandle := Max(FMaxHandle, AHandle + 1);
End;//

function TIdSocketListLinux.Count: Integer;
var
  I: Integer;

Begin
  Result := 0;
  for i:= 0 to __FD_SETSIZE - 1 do begin //? use FMaxHandle div x
    if FD_ISSET(i, FFDSet) then begin
      inc(Result);
    end;
  end;
End;//



function TIdSocketListLinux.GetItem(AIndex: Integer): TIdStackSocketHandle;
var
  LIndex, i: Integer;

Begin
  Result := 0;
  LIndex := 0;
  for i:= 0 to __FD_SETSIZE - 1 do begin //? use FMaxHandle div x
   if FD_ISSET(i, FFDSet) then begin
      if LIndex = AIndex then begin
        Result := i;
        Break;
      end else begin
        inc(LIndex);
      end;
    end;//if item
  end;
End;//

procedure TIdSocketListLinux.Remove(AHandle: TIdStackSocketHandle);
var
  i: Integer;

Begin
  FD_CLR(AHandle, FFDSet);
  if AHandle+1 >= FMaxHandle then begin
    for i:=__FD_SETSIZE - 1 downto 0 do begin
      if FD_ISSET(i, FFDSet) then begin
        FMaxHandle := i + 1;
        Break;
      end;
    end;
  end;
End;//

function TIdStackLinux.WSTranslateSocketErrorMsg(
  const AErr: integer): string;
//we override this function for the herr constants that
//are returned by the DNS functions
begin
  case AErr of
    libc.HOST_NOT_FOUND : Result := RSStackHOST_NOT_FOUND;
    libc.TRY_AGAIN : Result := RSStackTRY_AGAIN;
    libc.NO_RECOVERY : Result := RSStackNO_RECOVERY;
    libc.NO_DATA : Result := RSStackNO_DATA;
  else
    Result := inherited WSTranslateSocketErrorMsg(AErr);
  end;
end;

INITIALIZATION
  GSocketListClass := TIdSocketListLinux;
end.