/*
 * Copyright (c) 2021 Omar Polo <op@omarpolo.com>
 *
 * Permission to use, copy, modify, and distribute this software for any
 * purpose with or without fee is hereby granted, provided that the above
 * copyright notice and this permission notice appear in all copies.
 *
 * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
 * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
 * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
 * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
 * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
 * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
 * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
 */

#ifndef KAMID_H
#define KAMID_H

#include <limits.h>
#include <stdint.h>
#include <tls.h>

/* TODO: make these customizable */
#define KD_CONF_FILE		"/etc/kamid.conf"
#define KD_USER			"_kamid"
#define KD_SOCKET		"/var/run/kamid.sock"

#define IMSG_DATA_SIZE(imsg)	((imsg).hdr.len - IMSG_HEADER_SIZE)

enum imsg_type {
	IMSG_NONE,
	IMSG_CTL_LOG_VERBOSE,
	IMSG_CTL_RELOAD,
	IMSG_CTL_DEBUG,
	IMSG_CTL_DEBUG_BACK,	/* kd_debug_info */
	IMSG_CTL_DEBUG_END,
	IMSG_STARTUP,
	IMSG_RECONF_CONF,
	IMSG_RECONF_PKI,
	IMSG_RECONF_PKI_CERT,
	IMSG_RECONF_PKI_KEY,
	IMSG_RECONF_LISTEN,
	IMSG_RECONF_END,
	IMSG_AUTH,		/* kd_auth_proc */
	IMSG_AUTH_TLS,		/* kd_auth_req */
	IMSG_CONN_GONE,
	IMSG_BUF,
	IMSG_BUF_CONT,
	IMSG_MSIZE,
	IMSG_CLOSE,
};

struct kd_options_conf {
	/* ... */
};

struct table;

#define L_NONE	0x0
#define L_TLS	0x1
struct kd_listen_conf {
	STAILQ_ENTRY(kd_listen_conf)	 entry;
	uint32_t			 id;
	uint32_t			 flags;
	int				 fd;
	char				 iface[LINE_MAX];
	uint16_t			 port;

	/* certificate hash => (virtual) user */
	struct table			*auth_table;

	/* virtual user => local user */
	struct table			*virtual_table;

	/* (virtual) user => export directory */
	struct table			*userdata_table;

	char				 pki[LINE_MAX];
	struct event			 ev;
	struct tls			*ctx;
};

struct kd_pki_conf {
	STAILQ_ENTRY(kd_pki_conf)	 entry;
	char				 name[LINE_MAX];
	uint8_t				*cert;
	size_t				 certlen;
	uint8_t				*key;
	size_t				 keylen;
	struct tls_config		*tlsconf;
};

struct kd_tables_conf {
	STAILQ_ENTRY(kd_tables_conf)	 entry;
	struct table			*table;
};

struct kd_conf {
	struct kd_options_conf					 kd_options;
	STAILQ_HEAD(kd_pki_conf_head, kd_pki_conf)		 pki_head;
	STAILQ_HEAD(kd_tables_conf_head, kd_tables_conf)	 table_head;
	STAILQ_HEAD(kd_listen_conf_head, kd_listen_conf)	 listen_head;
};

struct kd_auth_req {
	uint32_t	listen_id;
	char		hash[128+1];
};

struct kd_auth_proc {
	char		uname[LOGIN_NAME_MAX];
	char		dir[PATH_MAX];
};

struct kd_debug_info {
	uint32_t	client_id;
	uint32_t	fid;
	char		path[NAME_MAX];
};

/* kamid.c */
extern int verbose;
int	main_reload(void);
int	main_imsg_compose_listener(int, int, uint32_t, const void *, uint16_t);
void	merge_config(struct kd_conf *, struct kd_conf *);

struct kd_conf	*config_new_empty(void);
void		 config_clear(struct kd_conf *);

/* parse.y */
struct kd_conf	*parse_config(const char *);
int		 cmdline_symset(char *);
void		 clear_config(struct kd_conf *);

#endif