/*
 * Copyright (c) 2013 Joris Vink <joris@coders.se>
 *
 * 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 __H_KORE_H
#define __H_KORE_H

#define KORE_RESULT_ERROR	0
#define KORE_RESULT_OK		1

#define errno_s			strerror(errno)
#define ssl_errno_s		ERR_error_string(ERR_get_error(), NULL)
#define kore_log(fmt, ...)	\
	kore_log_internal(__FILE__, __LINE__, fmt, ##__VA_ARGS__)

#define NETBUF_RECV		0
#define NETBUF_SEND		1

#define NETBUF_CALL_CB_ALWAYS	0x01
#define NETBUF_FORCE_REMOVE	0x02
#define NETBUF_RETAIN		0x04

struct netbuf {
	u_int8_t		*buf;
	u_int32_t		offset;
	u_int32_t		len;
	u_int8_t		type;
	u_int8_t		flags;

	void			*owner;
	void			*extra;
	int			(*cb)(struct netbuf *);

	TAILQ_ENTRY(netbuf)	list;
};

struct listener {
	int			fd;
	struct sockaddr_in	sin;
};

#define CONN_STATE_UNKNOWN		0
#define CONN_STATE_SSL_SHAKE		1
#define CONN_STATE_ESTABLISHED		2
#define CONN_STATE_DISCONNECTING	3

#define CONN_PROTO_UNKNOWN	0
#define CONN_PROTO_SPDY		1
#define CONN_PROTO_HTTP		2

#define CONN_READ_POSSIBLE	0x01
#define CONN_WRITE_POSSIBLE	0x02

struct connection {
	int			fd;
	int			state;
	int			proto;
	struct sockaddr_in	sin;
	void			*owner;
	SSL			*ssl;
	int			flags;

	u_int8_t		inflate_started;
	z_stream		z_inflate;
	u_int8_t		deflate_started;
	z_stream		z_deflate;

	TAILQ_HEAD(, netbuf)	send_queue;
	TAILQ_HEAD(, netbuf)	recv_queue;

	u_int32_t		client_stream_id;
	TAILQ_HEAD(, spdy_stream)	spdy_streams;

	TAILQ_ENTRY(connection)	list;
};

#define HANDLER_TYPE_STATIC	1
#define HANDLER_TYPE_DYNAMIC	2

struct kore_module_handle {
	char			*path;
	char			*func;
	void			*addr;
	int			type;
	regex_t			rctx;

	TAILQ_ENTRY(kore_module_handle)		list;
};

#define KORE_BUF_INITIAL	128
#define KORE_BUF_INCREMENT	KORE_BUF_INITIAL

struct kore_buf {
	u_int8_t		*data;
	u_int32_t		length;
	u_int32_t		offset;
};

struct buf_vec {
	u_int8_t		*data;
	u_int32_t		length;
};

extern int	server_port;
extern char	*server_ip;

void		*kore_malloc(size_t);
void		*kore_calloc(size_t, size_t);
void		*kore_realloc(void *, size_t);
time_t		kore_date_to_time(char *);
char		*kore_time_to_date(time_t);
char		*kore_strdup(const char *);
void		kore_parse_config(const char *);
void		kore_strlcpy(char *, const char *, size_t);
void		kore_server_disconnect(struct connection *);
int		kore_split_string(char *, char *, char **, size_t);
long long	kore_strtonum(const char *, long long, long long, int *);

void		kore_module_load(char *);
void		kore_module_reload(void);
int		kore_module_loaded(void);
int		kore_module_domain_new(char *);
void		*kore_module_handler_find(char *, char *);
int		kore_module_handler_new(char *, char *, char *, int);

void		fatal(const char *, ...);
void		kore_log_internal(char *, int, const char *, ...);

u_int16_t	net_read16(u_int8_t *);
u_int32_t	net_read32(u_int8_t *);
void		net_write16(u_int8_t *, u_int16_t);
void		net_write32(u_int8_t *, u_int32_t);
int		net_recv(struct connection *);
int		net_send(struct connection *);
int		net_send_flush(struct connection *);
int		net_recv_flush(struct connection *);
void		net_recv_queue(struct connection *, size_t, int,
		    struct netbuf **, int (*cb)(struct netbuf *));
int		net_recv_expand(struct connection *c, struct netbuf *, size_t,
		    int (*cb)(struct netbuf *));
void		net_send_queue(struct connection *, u_int8_t *, size_t, int,
		    struct netbuf **, int (*cb)(struct netbuf *));

struct kore_buf	*kore_buf_create(u_int32_t);
void		kore_buf_append(struct kore_buf *, u_int8_t *, u_int32_t);
u_int8_t	*kore_buf_release(struct kore_buf *, u_int32_t *);
void	kore_buf_appendf(struct kore_buf *, const char *, ...);
void	kore_buf_appendv(struct kore_buf *, struct buf_vec *, u_int16_t);

struct spdy_header_block	*spdy_header_block_create(int);
struct spdy_stream	*spdy_stream_lookup(struct connection *, u_int32_t);
int			spdy_stream_get_header(struct spdy_header_block *,
			    char *, char **);

int		spdy_frame_recv(struct netbuf *);
void		spdy_frame_send(struct connection *, u_int16_t,
		    u_int8_t, u_int32_t, struct spdy_stream *, u_int32_t);
void		spdy_header_block_add(struct spdy_header_block *,
		    char *, char *);
u_int8_t	*spdy_header_block_release(struct connection *,
		    struct spdy_header_block *, u_int32_t *);

#endif /* !__H_KORE_H */