/*****************************************************************************
*    Open LiteSpeed is an open source HTTP server.                           *
*    Copyright (C) 2013 - 2022  LiteSpeed Technologies, Inc.                 *
*                                                                            *
*    This program is free software: you can redistribute it and/or modify    *
*    it under the terms of the GNU General Public License as published by    *
*    the Free Software Foundation, either version 3 of the License, or       *
*    (at your option) any later version.                                     *
*                                                                            *
*    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. See the            *
*    GNU General Public License for more details.                            *
*                                                                            *
*    You should have received a copy of the GNU General Public License       *
*    along with this program. If not, see http://www.gnu.org/licenses/.      *
*****************************************************************************/
#ifndef _FCGIDEF_H_
#define _FCGIDEF_H_

/************************************************************************
    FastCGI types and definitions.
 ************************************************************************/


/*
 * Listening socket file number
 */
#define FCGI_LISTENSOCK_FILENO 0

typedef struct
{
    unsigned char version;
    unsigned char type;
    unsigned char requestIdB1;
    unsigned char requestIdB0;
    unsigned char contentLengthB1;
    unsigned char contentLengthB0;
    unsigned char paddingLength;
    unsigned char reserved;
} FCGI_Header;

/*
 * Number of bytes in a FCGI_Header.  Future versions of the protocol
 * will not reduce this number.
 */
#define FCGI_HEADER_LEN         8

/*
 * Value for version component of FCGI_Header
 */
#define FCGI_VERSION_1           1

/*
 * Values for type component of FCGI_Header
 */
#define FCGI_BEGIN_REQUEST       1
#define FCGI_ABORT_REQUEST       2
#define FCGI_END_REQUEST         3
#define FCGI_PARAMS              4
#define FCGI_STDIN               5
#define FCGI_STDOUT              6
#define FCGI_STDERR              7
#define FCGI_DATA                8
#define FCGI_GET_VALUES          9
#define FCGI_GET_VALUES_RESULT  10
#define FCGI_UNKNOWN_TYPE       11
#define FCGI_MAXTYPE (FCGI_UNKNOWN_TYPE)

/*
 * Value for requestId component of FCGI_Header
 */
#define FCGI_NULL_REQUEST_ID     0

typedef struct
{
    unsigned char roleB1;
    unsigned char roleB0;
    unsigned char flags;
    unsigned char reserved[5];
} FCGI_BeginRequestBody;

typedef struct
{
    FCGI_Header header;
    FCGI_BeginRequestBody body;
} FCGI_BeginRequestRecord;


/*
 * Values for role component of FCGI_BeginRequestBody
 */
#define FCGI_RESPONDER          1
#define FCGI_AUTHORIZER         2
#define FCGI_FILTER             3

#define FCGI_KEEP_CONN          1

typedef struct
{
    unsigned char appStatusB3;
    unsigned char appStatusB2;
    unsigned char appStatusB1;
    unsigned char appStatusB0;
    unsigned char protocolStatus;
    unsigned char reserved[3];
} FCGI_EndRequestBody;

typedef struct
{
    FCGI_Header header;
    FCGI_EndRequestBody body;
} FCGI_EndRequestRecord;

/*
 * Values for protocolStatus component of FCGI_EndRequestBody
 */
#define FCGI_REQUEST_COMPLETE   0
#define FCGI_CANT_MPX_CONN      1
#define FCGI_OVERLOADED         2
#define FCGI_UNKNOWN_ROLE       3

/*
 * Variable names for FCGI_GET_VALUES / FCGI_GET_VALUES_RESULT records
 */
#define FCGI_MAX_CONNS  "FCGI_MAX_CONNS"
#define FCGI_MAX_REQS   "FCGI_MAX_REQS"
#define FCGI_MPXS_CONNS "FCGI_MPXS_CONNS"

typedef struct
{
    unsigned char type;
    unsigned char reserved[7];
} FCGI_UnknownTypeBody;

typedef struct
{
    FCGI_Header header;
    FCGI_UnknownTypeBody body;
} FCGI_UnknownTypeRecord;

/***************************************************************
        End of Fast CGI definition.
****************************************************************/

#endif //_FCGIDEF_H_


