/*-
 * Copyright (c) 2006 Verdens Gang AS
 * Copyright (c) 2006-2011 Varnish Software AS
 * All rights reserved.
 *
 * Author: Poul-Henning Kamp <phk@phk.freebsd.dk>
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer.
 * 2. Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in the
 *    documentation and/or other materials provided with the distribution.
 *
 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
 * ARE DISCLAIMED.  IN NO EVENT SHALL AUTHOR OR CONTRIBUTORS BE LIABLE
 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
 * SUCH DAMAGE.
 *
 * Public definition of the CLI protocol, part of the published Varnish-API.
 *
 * The overall structure of the protocol is a command-line like
 * "command+arguments" request and a IETF style "number + string" response.
 *
 * Arguments can contain arbitrary sequences of bytes which are encoded
 * in back-slash notation in double-quoted, if necessary.
 */

/*
 * These macros define the common data for requests in the CLI protocol.
 * The fields are:
 *	const char *	request_name
 *	const char *	request_syntax (for short help)
 *	const char *	request_help (for long help)
 *	unsigned	minimum_arguments
 *	unsigned	maximum_arguments
 */

#define CLI_BAN								\
	"ban",								\
	"ban <field> <operator> <arg> [&& <field> <oper> <arg> ...]",	\
	"\tMark obsolete all objects where all the conditions match.",	\
	3, UINT_MAX

#define CLI_BAN_LIST							\
	"ban.list",							\
	"ban.list",							\
	"\tList the active bans.",					\
	0, 0

#define CLI_VCL_LOAD							\
	"vcl.load",							\
	"vcl.load <configname> <filename> [auto|cold|warm]",		\
	"\tCompile and load the VCL file under the name provided.",	\
	2, 3

#define CLI_VCL_INLINE							\
	"vcl.inline",							\
	"vcl.inline <configname> <quoted_VCLstring> [auto|cold|warm]",	\
	"\tCompile and load the VCL data under the name provided.",	\
	2, 3

#define CLI_VCL_STATE							\
	"vcl.state",							\
	"vcl.state <configname> [auto|cold|warm]",			\
	"\tForce the state of the named configuration.",		\
	2, 2

#define CLI_VCL_DISCARD							\
	"vcl.discard",							\
	"vcl.discard <configname>",					\
	"\tUnload the named configuration (when possible).",		\
	1, 1

#define CLI_VCL_LIST							\
	"vcl.list",							\
	"vcl.list",							\
	"\tList all loaded configuration.",				\
	0, 0

#define CLI_VCL_SHOW							\
	"vcl.show",							\
	"vcl.show [-v] <configname>",					\
	"\tDisplay the source code for the specified configuration.",	\
	1, 2

#define CLI_VCL_USE							\
	"vcl.use",							\
	"vcl.use <configname>",						\
	"\tSwitch to the named configuration immediately.",		\
	1, 1

#define CLI_PARAM_SHOW							\
	"param.show",							\
	"param.show [-l] [<param>]",					\
	"\tShow parameters and their values.",				\
	0, 2

#define CLI_PARAM_SET							\
	"param.set",							\
	"param.set <param> <value>",					\
	"\tSet parameter value.",					\
	2,2

#define CLI_SERVER_STOP							\
	"stop",								\
	"stop",								\
	"\tStop the Varnish cache process.",				\
	0, 0

#define CLI_SERVER_START						\
	"start",							\
	"start",							\
	"\tStart the Varnish cache process.",				\
	0, 0

#define CLI_PING							\
	"ping",								\
	"ping [<timestamp>]",						\
	"\tKeep connection alive.",					\
	0, 1

#define CLI_HELP							\
	"help",								\
	"help [<command>]",						\
	"\tShow command/protocol help.",				\
	0, 1

#define CLI_QUIT							\
	"quit",								\
	"quit",								\
	"\tClose connection.",						\
	0, 0

#define CLI_SERVER_STATUS						\
	"status",							\
	"status",							\
	"\tCheck status of Varnish cache process.",			\
	0, 0

#define CLI_BANNER							\
	"banner",							\
	"banner",							\
	"\tPrint welcome banner.",					\
	0, 0

#define CLI_AUTH							\
	"auth",								\
	"auth <response>",						\
	"\tAuthenticate.",						\
	1, 1

#define CLI_PANIC_SHOW							\
	"panic.show",							\
	"panic.show",							\
	"\tReturn the last panic, if any.",				\
	0, 0

#define CLI_PANIC_CLEAR							\
	"panic.clear",							\
	"panic.clear [-z]",						\
	"\tClear the last panic, if any. -z will clear related varnishstat counter(s)",	\
	0, 1

/*
 * Status/return codes in the CLI protocol
 */

enum VCLI_status_e {
	CLIS_SYNTAX	= 100,
	CLIS_UNKNOWN	= 101,
	CLIS_UNIMPL	= 102,
	CLIS_TOOFEW	= 104,
	CLIS_TOOMANY	= 105,
	CLIS_PARAM	= 106,
	CLIS_AUTH	= 107,
	CLIS_OK		= 200,
	CLIS_TRUNCATED	= 201,
	CLIS_CANT	= 300,
	CLIS_COMMS	= 400,
	CLIS_CLOSE	= 500
};

/* Length of first line of response */
#define CLI_LINE0_LEN	13
#define CLI_AUTH_RESPONSE_LEN		64	/* 64 hex + NUL */

#if !defined(VCLI_PROTOCOL_ONLY)
/* Convenience functions exported in libvarnishapi */
int VCLI_WriteResult(int fd, unsigned status, const char *result);
int VCLI_ReadResult(int fd, unsigned *status, char **ptr, double tmo);
void VCLI_AuthResponse(int S_fd, const char *challenge,
    char reponse[CLI_AUTH_RESPONSE_LEN + 1]);
#endif
