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 /*

  * Copyright 2001-2007 Niels Provos <provos@citi.umich.edu>

  * Copyright 2007-2012 Niels Provos and Nick Mathewson

  *

  * This header file contains definitions for dealing with HTTP requests

  * that are internal to libevent.  As user of the library, you should not

  * need to know about these.

  */

 #ifndef _HTTP_INTERNAL_H_

 #define _HTTP_INTERNAL_H_

 #include "event2/event_struct.h"

 #include "util-internal.h"

 #include "defer-internal.h"

 #define HTTP_CONNECT_TIMEOUT	45

 #define HTTP_WRITE_TIMEOUT	50

 #define HTTP_READ_TIMEOUT	50

 #define HTTP_PREFIX		"http://"

 #define HTTP_DEFAULTPORT	80

 enum message_read_status {

 	ALL_DATA_READ = 1,

 	MORE_DATA_EXPECTED = 0,

 	DATA_CORRUPTED = -1,

 	REQUEST_CANCELED = -2,

 	DATA_TOO_LONG = -3

 };

 enum evhttp_connection_error {

 	EVCON_HTTP_TIMEOUT,

 	EVCON_HTTP_EOF,

 	EVCON_HTTP_INVALID_HEADER,

 	EVCON_HTTP_BUFFER_ERROR,

 	EVCON_HTTP_REQUEST_CANCEL

 };

 struct evbuffer;

 struct addrinfo;

 struct evhttp_request;

 /* Indicates an unknown request method. */

 #define _EVHTTP_REQ_UNKNOWN (1<<15)

 enum evhttp_connection_state {

 	EVCON_DISCONNECTED,	/**< not currently connected not trying either*/

 	EVCON_CONNECTING,	/**< tries to currently connect */

 	EVCON_IDLE,		/**< connection is established */

 	EVCON_READING_FIRSTLINE,/**< reading Request-Line (incoming conn) or

 				 **< Status-Line (outgoing conn) */

 	EVCON_READING_HEADERS,	/**< reading request/response headers */

 	EVCON_READING_BODY,	/**< reading request/response body */

 	EVCON_READING_TRAILER,	/**< reading request/response chunked trailer */

 	EVCON_WRITING		/**< writing request/response headers/body */

 };

 struct event_base;

 /* A client or server connection. */

 struct evhttp_connection {

 	/* we use this tailq only if this connection was created for an http

 	 * server */

 	TAILQ_ENTRY(evhttp_connection) next;

 	evutil_socket_t fd;

 	struct bufferevent *bufev;

 	struct event retry_ev;		/* for retrying connects */

 	char *bind_address;		/* address to use for binding the src */

 	u_short bind_port;		/* local port for binding the src */

 	char *address;			/* address to connect to */

 	u_short port;

 	size_t max_headers_size;

 	ev_uint64_t max_body_size;

 	int flags;

 #define EVHTTP_CON_INCOMING	0x0001	/* only one request on it ever */

 #define EVHTTP_CON_OUTGOING	0x0002  /* multiple requests possible */

 #define EVHTTP_CON_CLOSEDETECT  0x0004  /* detecting if persistent close */

 	int timeout;			/* timeout in seconds for events */

 	int retry_cnt;			/* retry count */

 	int retry_max;			/* maximum number of retries */

 	enum evhttp_connection_state state;

 	/* for server connections, the http server they are connected with */

 	struct evhttp *http_server;

 	TAILQ_HEAD(evcon_requestq, evhttp_request) requests;

 	void (*cb)(struct evhttp_connection *, void *);

 	void *cb_arg;

 	void (*closecb)(struct evhttp_connection *, void *);

 	void *closecb_arg;

 	struct deferred_cb read_more_deferred_cb;

 	struct event_base *base;

 	struct evdns_base *dns_base;

 };

 /* A callback for an http server */

 struct evhttp_cb {

 	TAILQ_ENTRY(evhttp_cb) next;

 	char *what;

 	void (*cb)(struct evhttp_request *req, void *);

 	void *cbarg;

 };

 /* both the http server as well as the rpc system need to queue connections */

 TAILQ_HEAD(evconq, evhttp_connection);

 /* each bound socket is stored in one of these */

 struct evhttp_bound_socket {

 	TAILQ_ENTRY(evhttp_bound_socket) next;

 	struct evconnlistener *listener;

 };

 /* server alias list item. */

 struct evhttp_server_alias {

 	TAILQ_ENTRY(evhttp_server_alias) next;

 	char *alias; /* the server alias. */

 };

 struct evhttp {

 	/* Next vhost, if this is a vhost. */

 	TAILQ_ENTRY(evhttp) next_vhost;

 	/* All listeners for this host */

 	TAILQ_HEAD(boundq, evhttp_bound_socket) sockets;

 	TAILQ_HEAD(httpcbq, evhttp_cb) callbacks;

 	/* All live connections on this host. */

 	struct evconq connections;

 	TAILQ_HEAD(vhostsq, evhttp) virtualhosts;

 	TAILQ_HEAD(aliasq, evhttp_server_alias) aliases;

 	/* NULL if this server is not a vhost */

 	char *vhost_pattern;

 	int timeout;

 	size_t default_max_headers_size;

 	ev_uint64_t default_max_body_size;

 	/* Bitmask of all HTTP methods that we accept and pass to user

 	 * callbacks. */

 	ev_uint16_t allowed_methods;

 	/* Fallback callback if all the other callbacks for this connection

 	   don't match. */

 	void (*gencb)(struct evhttp_request *req, void *);

 	void *gencbarg;

 	struct event_base *base;

 };

 /* XXX most of these functions could be static. */

 /* resets the connection; can be reused for more requests */

 void evhttp_connection_reset(struct evhttp_connection *);

 /* connects if necessary */

 int evhttp_connection_connect(struct evhttp_connection *);

 /* notifies the current request that it failed; resets connection */

 void evhttp_connection_fail(struct evhttp_connection *,

     enum evhttp_connection_error error);

 enum message_read_status;

 enum message_read_status evhttp_parse_firstline(struct evhttp_request *, struct evbuffer*);

 enum message_read_status evhttp_parse_headers(struct evhttp_request *, struct evbuffer*);

 void evhttp_start_read(struct evhttp_connection *);

 /* response sending HTML the data in the buffer */

 void evhttp_response_code(struct evhttp_request *, int, const char *);

 void evhttp_send_page(struct evhttp_request *, struct evbuffer *);

 #endif /* _HTTP_H */