unit chesstcputils;

{$mode objfpc}{$H+}

interface

uses
  {$IFDEF MSWINDOWS}
  Winsock,
  {$ENDIF}
  Classes, SysUtils, Process;

function ChessGetLocalIP(): string;

implementation

const
  CFormatIPMask = '%d.%d.%d.%d';

function ChessGetLocalIP(): string;
var
  I, VAttempt: Integer;
  VStrTemp, VSitesToTry: TStringList;
{$IFDEF UNIX}
  VProcess: TProcess;
{$ENDIF}
{$IFDEF MSWINDOWS}
var
  VWSAData: TWSAData;
  VHostEnt: PHostEnt;
  VName: string;
{$ENDIF}
begin
  Result := '';
{$IFDEF UNIX}
      VStrTemp := TStringList.Create;
      VProcess := TProcess.Create(nil);
      try
        VProcess.CommandLine :=
          'sh -c "ifconfig eth0 | awk ''/inet end/ {print $3}''"';
        VProcess.Options := [poWaitOnExit, poUsePipes];
        VProcess.Execute;
        VStrTemp.LoadFromStream(VProcess.Output);
        Result := Trim(VStrTemp.Text);
      finally
        VStrTemp.Free;
        VProcess.Free;
      end;
{$ENDIF}
{$IFDEF MSWINDOWS}
{$HINTS OFF}
      WSAStartup(2, VWSAData);
{$HINTS ON}
      SetLength(VName, 255);
      GetHostName(PChar(VName), 255);
      SetLength(VName, StrLen(PChar(VName)));
      VHostEnt := GetHostByName(PChar(VName));
      with VHostEnt^ do
        Result := Format(CFormatIPMask, [Byte(h_addr^[0]), Byte(h_addr^[1]),
          Byte(h_addr^[2]), Byte(h_addr^[3])]);
      WSACleanup;
{$ENDIF}
end;

end.