/*
 * Asterisk -- A telephony toolkit for Linux.
 *
 * External call management support 
 * 
 * Copyright (C) 1999, Mark Spencer
 *
 * Mark Spencer <markster@linux-support.net>
 *
 * This program is free software, distributed under the terms of
 * the GNU General Public License.
 *
 * Includes code and algorithms from the Zapata library.
 *
 */

#ifndef _ASTERISK_MANAGER_H
#define _ASTERISK_MANAGER_H

#include <stdarg.h>
#include <sys/types.h>
#include <sys/socket.h>
#include <netinet/in.h>
#include <arpa/inet.h>

#include "asterisk/lock.h"

/*!
  \file manager.h
  \brief The AMI - Asterisk Manager Interface - is a TCP protocol created to 
	 manage Asterisk with third-party software.

 Manager protocol packages are text fields of the form a: b.  There is
 always exactly one space after the colon.
 
 The first header type is the "Event" header.  Other headers vary from
 event to event.  Headers end with standard \r\n termination.
 
 Some standard headers:

 Action: <action>		-- request or notification of a particular action
 Response: <response>		-- response code, like "200 OK"
 
 */
 
#define DEFAULT_MANAGER_PORT 5038	/* Default port for Asterisk management via TCP */

#define EVENT_FLAG_SYSTEM 		(1 << 0) /* System events such as module load/unload */
#define EVENT_FLAG_CALL			(1 << 1) /* Call event, such as state change, etc */
#define EVENT_FLAG_LOG			(1 << 2) /* Log events */
#define EVENT_FLAG_VERBOSE		(1 << 3) /* Verbose messages */
#define EVENT_FLAG_COMMAND		(1 << 4) /* Ability to read/set commands */
#define EVENT_FLAG_AGENT		(1 << 5) /* Ability to read/set agent info */
#define EVENT_FLAG_USER                 (1 << 6) /* Ability to read/set user info */

/* Export manager structures */
#define MAX_HEADERS 80
#define MAX_LEN 256

struct mansession {
	/*! Execution thread */
	pthread_t t;
	/*! Thread lock */
	ast_mutex_t lock;
	/*! socket address */
	struct sockaddr_in sin;
	/*! TCP socket */
	int fd;
	int blocking;
	/*! Logged in username */
	char username[80];
	/*! Authentication challenge */
	char challenge[10];
	/*! Authentication status */
	int authenticated;
	/*! Authorization for reading */
	int readperm;
	/*! Authorization for writing */
	int writeperm;
	/*! Buffer */
	char inbuf[MAX_LEN];
	int inlen;
	int send_events;
	struct mansession *next;
};


struct message {
	int hdrcount;
	char headers[MAX_HEADERS][MAX_LEN];
};

struct manager_action {
	/*! Name of the action */
	const char *action;
	/*! Short description of the action */
	const char *synopsis;
	/*! Detailed description of the action */
	const char *description;
	/*! Permission required for action.  EVENT_FLAG_* */
	int authority;
	/*! Function to be called */
	int (*func)(struct mansession *s, struct message *m);
	/*! For easy linking */
	struct manager_action *next;
};

int ast_carefulwrite(int fd, char *s, int len, int timeoutms);

/* External routines may register/unregister manager callbacks this way */
#define ast_manager_register(a, b, c, d) ast_manager_register2(a, b, c, d, NULL)

/* Use ast_manager_register2 to register with help text for new manager commands */

/*! Register a manager command with the manager interface */
/*! 	\param action Name of the requested Action:
	\param authority Required authority for this command
	\param func Function to call for this command
	\param synopsis Help text (one line, up to 30 chars) for CLI manager show commands
	\param description Help text, several lines
*/
int ast_manager_register2( 
	const char *action, 
	int authority, 
	int (*func)(struct mansession *s, struct message *m), 
	const char *synopsis,
	const char *description);

/*! Unregister a registred manager command */
/*!	\param action Name of registred Action:
*/
int ast_manager_unregister( char *action );

/*! External routines may send asterisk manager events this way */
/*! 	\param category	Event category, matches manager authorization
	\param event	Event name
	\param contents	Contents of event
*/ 
extern int manager_event(int category, char *event, char *contents, ...)
	__attribute__ ((format (printf, 3,4)));

/*! Get header from mananger transaction */
extern char *astman_get_header(struct message *m, char *var);
/*! Send error in manager transaction */
extern void astman_send_error(struct mansession *s, struct message *m, char *error);
extern void astman_send_response(struct mansession *s, struct message *m, char *resp, char *msg);
extern void astman_send_ack(struct mansession *s, struct message *m, char *msg);

/*! Called by Asterisk initialization */
extern int init_manager(void);
/*! Called by Asterisk initialization */
extern int reload_manager(void);
#endif