{
    $Id: sysutils.pp,v 1.59 2005/03/25 22:53:39 jonas Exp $
    This file is part of the Free Pascal run time library.
    Copyright (c) 1999-2000 by Florian Klaempfl
    member of the Free Pascal development team

    Sysutils unit for linux

    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.

 **********************************************************************}


Const 
  KernelUUID       = '/proc/sys/kernel/random/uuid';
  PreferKernelUUID = False;
  

Procedure GetURandomBytes(Var Buf; NBytes : Integer);

Var
  fd,I : Integer;
  P : PByte;
  
begin
  P:=@Buf;
  fd:=FileOpen('/dev/urandom',fmOpenRead);
  if (fd>=0) then
    Try
      While (NBytes>0) do
        begin
        I:=FileRead(fd,P^,nbytes);
        If I>0 then
          begin
          Inc(P,I);
          Dec(NBytes,I);
          end;
        end;  
    Finally
      FileClose(Fd);
    end
  else
    GetRandomBytes(Buf,NBytes);
end;

Const 
  MAX_ADJUSTMENT = 10;
  IPPROTO_IP     = 0;
  AF_INET        = 2;
  SOCK_DGRAM     = 2; 
  IF_NAMESIZE    = 16;
  SIOCGIFCONF    = $8912;
  SIOCGIFHWADDR  = $8927;
  
Type
{$ifdef FreeBSD}
{$DEFINE SOCK_HAS_SINLEN}               // BSD definition of scoketaddr
{$endif}
{$ifdef SOCK_HAS_SINLEN}
  sa_family_t=cuchar;
{$else}
  sa_family_t=cushort;
{$endif}
Type
  in_addr = packed record
             case boolean of
             true: (s_addr  : cuint32);         // inaddr_t=cuint32
             false: (s_bytes : packed array[1..4] of byte);
  end;
        
  TSockAddr = packed Record // if sa_len is defined, sa_family_t is smaller
  {$ifdef SOCK_HAS_SINLEN}
     sa_len     : cuchar;
  {$endif}
    case integer of
      0: (sa_family: sa_family_t;
          sa_data: packed array[0..13] of Byte);
      1: (sin_family: sa_family_t;
          sin_port: cushort;
          sin_addr: in_addr;
          sin_zero: packed array[0..7] of Byte);
      end;

  PSockAddr = ^TSockAddr;
  Sockaddr  = TSockAddr;                // Kylix compat
  {$packrecords c}
  tifr_ifrn = record
    case integer of
      0 : (ifrn_name: array [0..IF_NAMESIZE-1] of char);
  end;
  tifmap = record
    mem_start : cardinal;
    mem_end   : cardinal;
    base_addr : word;
    irq       : byte;
    dma       : byte;
    port      : byte;
  end;
  TIFrec = record
    ifr_ifrn : tifr_ifrn;
    case integer of
      0 : (ifru_addr      : TSockAddr);
      1 : (ifru_dstaddr   : TSockAddr);
      2 : (ifru_broadaddr : TSockAddr);
      3 : (ifru_netmask   : TSockAddr);
      4 : (ifru_hwaddr    : TSockAddr);
      5 : (ifru_flags     : word); 
      6 : (ifru_ivalue    : longint);
      7 : (ifru_mtu       : longint);
      8 : (ifru_map       : tifmap);
      9 : (ifru_slave     : Array[0..IF_NAMESIZE-1] of char);
      10 : (ifru_newname  : Array[0..IF_NAMESIZE-1] of char);
      11 : (ifru_data     : pointer);
  end; 
  TIFConf = record
    ifc_len : longint;
    case integer of
      0 : (ifcu_buf : pointer);
      1 : (ifcu_req : ^tifrec);
  end;

  tuuid = record 
    time_low : cardinal;
    time_mid : Word;
    time_hi_and_version : Word;
    clock_seq : Word;
    node : Array[0..5] of byte;
  end;

Function SocketCall(SockCallNr,a1,a2,a3,a4,a5,a6:longint):longint;
var
  Args:array[1..6] of longint;
begin
  args[1]:=a1;
  args[2]:=a2;
  args[3]:=a3;
  args[4]:=a4;
  args[5]:=a5;
  args[6]:=a6;
  SocketCall:=do_Syscall(syscall_nr_socketcall,sockcallnr,longint(@args));
end;
                          
function SocketCall(SockCallNr,a1,a2,a3:longint):longint;
begin
   SocketCall:=SocketCall(SockCallNr,a1,a2,a3,0,0,0);
end;
                  
function  fpsocket (domain:cint; xtype:cint; protocol: cint):cint;
begin
  fpSocket:=SocketCall(1,Domain,xtype,Protocol);
end;

Var
  MacAddr      : Packed Array[1..6] of byte = (0,0,0,0,0,0);
  MacAddrTried : Byte = 0 ;
  Last   : TTimeVal = (tv_sec:0;tv_usec:0);
  ClockSeq   : Word = 0;
  AdjustMent : Integer = 0;
  
Function GetMacAddr : Boolean;

var
  i,j,n,Sd : Integer;
  buf : Array[0..1023] of byte;
  ifc : TIfConf;
  ifr : TIFRec;
  ifp : ^TIFRec;
  p   : PChar;
begin
  Result:=MacAddrTried>0;
  If Result then
    Result:=MacAddrTried>1
  else  
    begin
    MacAddrTried:=1;
    sd:=fpSocket(AF_INET,SOCK_DGRAM,IPPROTO_IP);
    if (sd<0) then 
      exit;
    Try
      ifc.ifc_len:=Sizeof(Buf);
      ifc.ifcu_buf:=@buf;
      if fpioctl(sd, SIOCGIFCONF, @ifc)<0 then
        Exit;
      n:= ifc.ifc_len;  
      i:=0;
      While (Not Result) and (I<N) do
        begin
        ifp:=@PByte(ifc.ifcu_buf)[i];
        move(ifp^.ifr_ifrn.ifrn_name,ifr.ifr_ifrn.ifrn_name,IF_NAMESIZE);
        if (fpioctl(sd, SIOCGIFHWADDR, @ifr) >= 0) then
          begin
          P:=Pchar(@ifr.ifru_hwaddr.sa_data);
          Result:=(p[0]<>#0) or (p[1]<>#0) or (p[2]<>#0) 
                  or (p[3]<>#0) or (p[4]<>#0) or (p[5]<>#0);
          If Result Then
            begin
            Move(P^,MacAddr,SizeOf(MacAddr));  
            MacAddrTried:=2;
            // DumpMacAddr;
            end;
          end;
        I:=I+sizeof(tifrec);
        end;
    Finally  
      fileClose(sd);
    end;
    end;
end;

  
Function GetClock(Var ClockHigh,ClockLow : Cardinal; Var RetClockSeq : Word) : boolean;

Var
  TV       : TTImeVal;
  ClockReg : QWord;  
  OK       : Boolean; 

begin
  OK:=True;
  Repeat
    FPGetTimeOfDay(@Tv,Nil);
    If (Last.tv_sec=0) and (last.tv_sec=0) then
      begin
      GetRandomBytes(ClockSeq,SizeOf(ClockSeq));
      ClockSeq:=ClockSeq and $1FFF;
      last:=TV;
      Dec(last.tv_sec);
      end;
    if (tv.tv_sec<last.tv_sec) or 
        ((tv.tv_sec=last.tv_sec) and (tv.tv_usec<last.tv_usec)) then
      begin
      ClockSeq:=(ClockSeq+1) and $1FFF;
      Adjustment:=0;
      Last:=Tv;
      end
    else if (tv.tv_sec=last.tv_sec) and (tv.tv_usec=last.tv_usec) then
      begin
      If Adjustment>=MAX_ADJUSTMENT then
        OK:=False
      else  
        inc(AdjustMent);
      end
    else
      begin
      AdjustMent:=0;
      Last:=tv;
      end;
  Until OK;  
  ClockReg:=tv.tv_usec*10+adjustment;
  Inc(ClockReg,tv.tv_sec*10000000);
  Inc(ClockReg,($01B21DD2 shl 32) + $13814000);
  ClockHigh   :=Hi(ClockReg);
  ClockLow    :=Lo(ClockReg);
  RetClockSeq :=ClockSeq;
  Result      :=True;                  
end;

Procedure UUIDPack(Const UU : TUUID; Var GUID : TGUID);

Var
  tmp : Cardinal;
  P   : PByte;
  
begin
  P:=@GUID;
  
  tmp:=uu.time_low;
  P[3]:=tmp and $FF;
  tmp:=tmp shr 8;
  P[2]:=tmp and $FF;
  tmp:=tmp shr 8;
  P[1]:=tmp and $FF;
  tmp:=tmp shr 8;
  P[0]:=tmp and $FF;
  
  tmp:=uu.time_mid;
  P[5]:=tmp and $FF;
  tmp:=tmp shr 8;
  P[4]:=tmp and $FF;
  
  tmp:=uu.time_hi_and_version;
  P[7]:=tmp and $FF;
  tmp:=tmp shr 8;
  P[6]:=tmp and $FF;
  
  tmp:=uu.clock_seq;
  P[9]:=tmp and $FF;
  tmp:=tmp shr 8;
  P[8]:=tmp and $FF;
  
  Move(uu.node,P[10],6);
end;

Procedure DumpMacAddr;

var
  I : Integer;
begin
  Write('Mac Addr: ');
  For i:=1 to 6 do
    write(hexstr(MacAddr[i],2),':');
end;

Function CreateMacGUID(Var GUID : TGUID) : Boolean;

Var
  UU       : TUUId;
  ClockMid : Cardinal;

begin
  Result:=GetMacAddr;
  If Result then
    begin
    // DumpMacAddr;
    // Writeln;
    GetClock(ClockMid,uu.time_low,uu.clock_seq);
    uu.Clock_seq:=uu.Clock_seq or $8000;
    uu.time_mid:=lo(clockMid);
    uu.time_hi_and_version:=hi(ClockMid) or $1000;
    move(MacAddr,uu.node,sizeof(MacAddr));
    UUIDPack(UU,GUID);
    end;
end;

Function CreateKernelGUID(Var GUID : TGUID) : Boolean;

Const
  UUIDLen = 36;

Var
  fd: Longint;
  S : String;
  
begin
  fd:=FileOpen(KernelUUID,fmOpenRead);
  Result:=(Fd>=0);
  if Result then
    begin
    SetLength(S,UUIDLen);
    SetLength(S,FileRead(fd,S[1],UUIDLen));
    Result:=(Length(S)=UUIDLen);
    If Result then
      begin
      GUID:=StringToGUID('{'+S+'}');
      //Writeln('Kernel ID = ',GuidToString(GUID));
      end;
    end;
end;

Function CreateGUID(out GUID : TGUID) : Integer;

begin
  if PreferKernelUUID then
    begin
    if not CreateKernelGUID(Guid) then
      if not CreateMACGuid(Guid) then
        GetRandomBytes(GUID,SizeOf(Guid));  
    end
  else  
    if not CreateMACGuid(Guid) then
      if not CreateKernelGUID(Guid) then
        GetRandomBytes(GUID,SizeOf(Guid));  
  Result:=0;    
end;