{* * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * *

Author:       Fran鏾is PIETTE, C.H.R. Citadelle
EMail:        francois.piette@pophost.eunet.be  http://www.rtfm.be/fpiette
              francois.piette@rtfm.be
Creation:     July 18, 1996
Object:       Windows 16bit API Interface Unit for Delphi 1.x and
              compatible with Borland Delphi 2.x Winsock
Support:      Please ask your question in the following newsgroup:
              news://forums.borland.com/borland.public.delphi.vcl.components.using
Legal issues: Copyright (C) 1996, 1997, 1998 by Fran鏾is PIETTE 
              <francois.piette@pophost.be>

              This software is provided 'as-is', without any express or
  	      implied warranty.  In no event will the author be held liable
              for any  damages arising from the use of this software.

              Permission is granted to anyone to use this software for any
              purpose, including commercial applications, and to alter it
              and redistribute it freely, subject to the following
              restrictions:

              1. The origin of this software must not be misrepresented,
                 you must not claim that you wrote the original software.
                 If you use this software in a product, an acknowledgment
                 in the product documentation would be appreciated but is
                 not required.

              2. Altered source versions must be plainly marked as such, and
                 must not be misrepresented as being the original software.

              3. This notice may not be removed or altered from any source 
                 distribution.

Updates:
Sep 21, 1997 Added $IFDEF to warn Delphi 2 or 3 user that something is wrong
             if they use this file.
Dec 13, 1997 Changed winsocket form 'WINSOCK.DLL' to 'WINSOCK' because Win 3.x
             like thos have it without extension (don't ask me why !)

 * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * *}
unit Winsock;

interface

{$IFNDEF VER80}
  'This file is for use with Delphi 1 only. Use the Borland provided file'
  'with any other Delphi Version. If you use this file with Delphi 2 or 3'
  'this is probably because your library path is wrong or you have not'
  'restored the directory structure when unzipping the file (you must use'
  'pkunzip option -d to restore the files).'
{$ENDIF}


uses WinTypes, WinProcs;

const
  winsocket = 'WINSOCK';
  { If your application can't find winsock.dll on startup, please try to  }
  { change the preceding line to "winsocket = 'winsock.dll';"             }
  { Also, try upper or lower case letters. Win 3.x is very capricious !   }

  { Misc constants }
  FD_SETSIZE               = 64;

  {
    Commands for ioctlsocket(),  taken from the BSD file fcntl.h.

    Ioctl's have the command encoded in the lower word,
    and the size of any in or out parameters in the upper
    word.  The high 2 bits of the upper word are used
    to encode the in/out status of the parameter; for now
    we restrict parameters to at most 128 bytes.
    0x20000000 distinguishes new & old ioctl's
  }
  IOCPARM_MASK             = $7f;         { parameters must be < 128 bytes }
  IOC_VOID                 = $20000000;   { no parameters }
  IOC_OUT                  = $40000000;   { copy out parameters }
  IOC_IN                   = $80000000;   { copy in parameters }
  IOC_INOUT                = (IOC_IN + IOC_OUT);

  FIONREAD                 = $4004667F;   { get # bytes to read }
  FIONBIO                  = $8004667E;   { set/clear non-blocking i/o }
  FIOASYNC                 = $8004667D;   { set/clear async i/o }

  { Socket I/O Controls }
  SIOCSHIWAT               = $80047300;   { set high watermark }
  SIOCGHIWAT               = $40047301;   { set low watermark }
  SIOCSLOWAT               = $80047302;   { set low watermark }
  SIOCGLOWAT               = $40047303;   { get low watermark }
  SIOCATMARK               = $40047307;   { at oob mark? }

  INADDR_ANY               = $00000000;
  INADDR_LOOPBACK          = $7f000001;
  INADDR_BROADCAST         = $ffffffff;
  INADDR_NONE              = $ffffffff;

  WSADESCRIPTION_LEN       = 256;
  WSASYS_STATUS_LEN        = 128;

  { Protocols }
  IPPROTO_IP         =  0;              { dummy for IP }
  IPPROTO_ICMP       =  1;              { control message protocol }
  IPPROTO_GGP        =  2;              { gateway^2 (deprecated) }
  IPPROTO_TCP        =  6;              { tcp }
  IPPROTO_PUP        =  12;             { pup }
  IPPROTO_UDP        =  17;             { user datagram protocol }
  IPPROTO_IDP        =  22;             { xns idp }
  IPPROTO_ND         =  77;             { UNOFFICIAL net disk proto }
  IPPROTO_RAW        = 255;             { raw IP packet }
  IPPROTO_MAX        = 256;

  { Port/socket numbers: network standard functions }
  IPPORT_ANY         =     0;
  IPPORT_ECHO        =     7;
  IPPORT_DISCARD     =     9;
  IPPORT_SYSTAT      =     11;
  IPPORT_DAYTIME     =     13;
  IPPORT_NETSTAT     =     15;
  IPPORT_FTP         =     21;
  IPPORT_TELNET      =     23;
  IPPORT_SMTP        =     25;
  IPPORT_TIMESERVER  =     37;
  IPPORT_NAMESERVER  =     42;
  IPPORT_WHOIS       =     43;
  IPPORT_MTP         =     57;

  { Port/socket numbers: host specific functions }
  IPPORT_TFTP        =     69;
  IPPORT_RJE         =     77;
  IPPORT_FINGER      =     79;
  IPPORT_TTYLINK     =     87;
  IPPORT_SUPDUP      =     95;

  { UNIX TCP sockets }
  IPPORT_EXECSERVER  =     512;
  IPPORT_LOGINSERVER =     513;
  IPPORT_CMDSERVER   =     514;
  IPPORT_EFSSERVER   =     520;

  { UNIX UDP sockets }
  IPPORT_BIFFUDP     =     512;
  IPPORT_WHOSERVER   =     513;
  IPPORT_ROUTESERVER =     520;

  { Ports < IPPORT_RESERVED are reserved for privileged processes (e.g. root) }
  IPPORT_RESERVED    =     1024;

  { Link numbers }
  IMPLINK_IP         =     155;
  IMPLINK_LOWEXPER   =     156;
  IMPLINK_HIGHEXPER  =     158;

  INVALID_SOCKET     =     $ffff;
  SOCKET_ERROR       =     (-1);

  { Types }
  SOCK_STREAM        =  1;              { stream socket }
  SOCK_DGRAM         =  2;              { datagram socket }
  SOCK_RAW           =  3;              { raw-protocol interface }
  SOCK_RDM           =  4;              { reliably-delivered message }
  SOCK_SEQPACKET     =  5;              { sequenced packet stream }

  { Option flags per-socket }
  SO_DEBUG           =  $0001;         { turn on debugging info recording }
  SO_ACCEPTCONN      =  $0002;         { socket has had listen() }
  SO_REUSEADDR       =  $0004;         { allow local address reuse }
  SO_KEEPALIVE       =  $0008;         { keep connections alive }
  SO_DONTROUTE       =  $0010;         { just use interface addresses }
  SO_BROADCAST       =  $0020;         { permit sending of broadcast msgs }
  SO_USELOOPBACK     =  $0040;         { bypass hardware when possible }
  SO_LINGER          =  $0080;         { linger on close if data present }
  SO_OOBINLINE       =  $0100;         { leave received OOB data in line }
  SO_DONTLINGER      = (not SO_LINGER);

 { Additional options }
  SO_SNDBUF          =  $1001;         { send buffer size }
  SO_RCVBUF          =  $1002;         { receive buffer size }
  SO_SNDLOWAT        =  $1003;         { send low-water mark }
  SO_RCVLOWAT        =  $1004;         { receive low-water mark }
  SO_SNDTIMEO        =  $1005;         { send timeout }
  SO_RCVTIMEO        =  $1006;         { receive timeout }
  SO_ERROR           =  $1007;         { get error status and clear }
  SO_TYPE            =  $1008;         { get socket type }


  { TCP options }
  TCP_NODELAY        =  $0001;

  { Address families }
  AF_UNSPEC          =  0;              { unspecified }
  AF_UNIX            =  1;              { local to host (pipes, portals) }
  AF_INET            =  2;              { internetwork: UDP, TCP, etc. }
  AF_IMPLINK         =  3;              { arpanet imp addresses }
  AF_PUP             =  4;              { pup protocols: e.g. BSP }
  AF_CHAOS           =  5;              { mit CHAOS protocols }
  AF_NS              =  6;              { XEROX NS protocols }
  AF_ISO             =  7;              { ISO protocols }
  AF_OSI             =  AF_ISO;         { OSI is ISO }
  AF_ECMA            =  8;              { european computer manufacturers }
  AF_DATAKIT         =  9;              { datakit protocols }
  AF_CCITT           =  10;             { CCITT protocols, X.25 etc }
  AF_SNA             =  11;             { IBM SNA }
  AF_DECnet          =  12;             { DECnet }
  AF_DLI             =  13;             { Direct data link interface }
  AF_LAT             =  14;             { LAT }
  AF_HYLINK          =  15;             { NSC Hyperchannel }
  AF_APPLETALK       =  16;             { AppleTalk }
  AF_NETBIOS         =  17;             { NetBios-style addresses }
  AF_MAX             =  18;

  { Protocol families, same as address families for now }
  PF_UNSPEC          =  AF_UNSPEC;
  PF_UNIX            =  AF_UNIX;
  PF_INET            =  AF_INET;
  PF_IMPLINK         =  AF_IMPLINK;
  PF_PUP             =  AF_PUP;
  PF_CHAOS           =  AF_CHAOS;
  PF_NS              =  AF_NS;
  PF_ISO             =  AF_ISO;
  PF_OSI             =  AF_OSI;
  PF_ECMA            =  AF_ECMA;
  PF_DATAKIT         =  AF_DATAKIT;
  PF_CCITT           =  AF_CCITT;
  PF_SNA             =  AF_SNA;
  PF_DECnet          =  AF_DECnet;
  PF_DLI             =  AF_DLI;
  PF_LAT             =  AF_LAT;
  PF_HYLINK          =  AF_HYLINK;
  PF_APPLETALK       =  AF_APPLETALK;
  PF_MAX             =  AF_MAX;

 { Level number for (get/set)sockopt() to apply to socket itself }
 SOL_SOCKET          =  -1;             { options for socket level }

 { Maximum queue length specifiable by listen }
 SOMAXCONN           =   5;

 MSG_OOB             =   1;             { process out-of-band data }
 MSG_PEEK            =   2;             { peek at incoming message }
 MSG_DONTROUTE       =   4;             { send without using routing tables }

 MSG_MAXIOVLEN       =  16;

 { Define constant based on rfc883, used by gethostbyxxxx() calls }
 MAXGETHOSTSTRUCT    =  1024;

 { Define flags to be used with the WSAAsyncSelect() call }
 FD_READ             =  1;
 FD_WRITE            =  2;
 FD_OOB              =  4;
 FD_ACCEPT           =  8;
 FD_CONNECT          =  16;
 FD_CLOSE            =  32;

 { All Windows Sockets error constants are biased by WSABASEERR fromthe normal }
 WSABASEERR          = 10000;

 { Windows Sockets definitions of regular Microsoft C error constants }
 WSAEINTR            = (WSABASEERR+4);
 WSAEBADF            = (WSABASEERR+9);
 WSAEACCES           = (WSABASEERR+13);
 WSAEFAULT           = (WSABASEERR+14);
 WSAEINVAL           = (WSABASEERR+22);
 WSAEMFILE           = (WSABASEERR+24);

 { Windows Sockets definitions of regular Berkeley error constants }
 WSAEWOULDBLOCK      = (WSABASEERR+35);
 WSAEINPROGRESS      = (WSABASEERR+36);
 WSAEALREADY         = (WSABASEERR+37);
 WSAENOTSOCK         = (WSABASEERR+38);
 WSAEDESTADDRREQ     = (WSABASEERR+39);
 WSAEMSGSIZE         = (WSABASEERR+40);
 WSAEPROTOTYPE       = (WSABASEERR+41);
 WSAENOPROTOOPT      = (WSABASEERR+42);
 WSAEPROTONOSUPPORT  = (WSABASEERR+43);
 WSAESOCKTNOSUPPORT  = (WSABASEERR+44);
 WSAEOPNOTSUPP       = (WSABASEERR+45);
 WSAEPFNOSUPPORT     = (WSABASEERR+46);
 WSAEAFNOSUPPORT     = (WSABASEERR+47);
 WSAEADDRINUSE       = (WSABASEERR+48);
 WSAEADDRNOTAVAIL    = (WSABASEERR+49);
 WSAENETDOWN         = (WSABASEERR+50);
 WSAENETUNREACH      = (WSABASEERR+51);
 WSAENETRESET        = (WSABASEERR+52);
 WSAECONNABORTED     = (WSABASEERR+53);
 WSAECONNRESET       = (WSABASEERR+54);
 WSAENOBUFS          = (WSABASEERR+55);
 WSAEISCONN          = (WSABASEERR+56);
 WSAENOTCONN         = (WSABASEERR+57);
 WSAESHUTDOWN        = (WSABASEERR+58);
 WSAETOOMANYREFS     = (WSABASEERR+59);
 WSAETIMEDOUT        = (WSABASEERR+60);
 WSAECONNREFUSED     = (WSABASEERR+61);
 WSAELOOP            = (WSABASEERR+62);
 WSAENAMETOOLONG     = (WSABASEERR+63);
 WSAEHOSTDOWN        = (WSABASEERR+64);
 WSAEHOSTUNREACH     = (WSABASEERR+65);
 WSAENOTEMPTY        = (WSABASEERR+66);
 WSAEPROCLIM         = (WSABASEERR+67);
 WSAEUSERS           = (WSABASEERR+68);
 WSAEDQUOT           = (WSABASEERR+69);
 WSAESTALE           = (WSABASEERR+70);
 WSAEREMOTE          = (WSABASEERR+71);

 { Extended Windows Sockets error constant definitions }
 WSASYSNOTREADY      = (WSABASEERR+91);
 WSAVERNOTSUPPORTED  = (WSABASEERR+92);
 WSANOTINITIALISED   = (WSABASEERR+93);

 { Authoritative Answer: Host not found }
 WSAHOST_NOT_FOUND   = (WSABASEERR+1001);
 HOST_NOT_FOUND      = WSAHOST_NOT_FOUND;

{ Non-Authoritative: Host not found, or SERVERFAIL }
 WSATRY_AGAIN        = (WSABASEERR+1002);
 TRY_AGAIN           = WSATRY_AGAIN;