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1 /*
2  * Copyright 2001 Niels Provos <provos@citi.umich.edu>
3  * All rights reserved.
4  *
5  * This header file contains definitions for dealing with HTTP requests
6  * that are internal to libevent.  As user of the library, you should not
7  * need to know about these.
8  */
9 
10 #ifndef _HTTP_H_
11 #define _HTTP_H_
12 
13 #define HTTP_CONNECT_TIMEOUT	45
14 #define HTTP_WRITE_TIMEOUT	50
15 #define HTTP_READ_TIMEOUT	50
16 
17 #define HTTP_PREFIX		"http://"
18 #define HTTP_DEFAULTPORT	80
19 
20 enum message_read_status {
21 	ALL_DATA_READ = 1,
22 	MORE_DATA_EXPECTED = 0,
23 	DATA_CORRUPTED = -1,
24 	REQUEST_CANCELED = -2
25 };
26 
27 enum evhttp_connection_error {
28 	EVCON_HTTP_TIMEOUT,
29 	EVCON_HTTP_EOF,
30 	EVCON_HTTP_INVALID_HEADER
31 };
32 
33 struct evbuffer;
34 struct addrinfo;
35 struct evhttp_request;
36 
37 /* A stupid connection object - maybe make this a bufferevent later */
38 
39 enum evhttp_connection_state {
40 	EVCON_DISCONNECTED,	/**< not currently connected not trying either*/
41 	EVCON_CONNECTING,	/**< tries to currently connect */
42 	EVCON_IDLE,		/**< connection is established */
43 	EVCON_READING_FIRSTLINE,/**< reading Request-Line (incoming conn) or
44 				 **< Status-Line (outgoing conn) */
45 	EVCON_READING_HEADERS,	/**< reading request/response headers */
46 	EVCON_READING_BODY,	/**< reading request/response body */
47 	EVCON_READING_TRAILER,	/**< reading request/response chunked trailer */
48 	EVCON_WRITING		/**< writing request/response headers/body */
49 };
50 
51 struct event_base;
52 
53 struct evhttp_connection {
54 	/* we use tailq only if they were created for an http server */
55 	TAILQ_ENTRY(evhttp_connection) (next);
56 
57 	int fd;
58 	struct event ev;
59 	struct event close_ev;
60 	struct evbuffer *input_buffer;
61 	struct evbuffer *output_buffer;
62 
63 	char *bind_address;		/* address to use for binding the src */
64 	u_short bind_port;		/* local port for binding the src */
65 
66 	char *address;			/* address to connect to */
67 	u_short port;
68 
69 	int flags;
70 #define EVHTTP_CON_INCOMING	0x0001	/* only one request on it ever */
71 #define EVHTTP_CON_OUTGOING	0x0002  /* multiple requests possible */
72 #define EVHTTP_CON_CLOSEDETECT  0x0004  /* detecting if persistent close */
73 
74 	int timeout;			/* timeout in seconds for events */
75 	int retry_cnt;			/* retry count */
76 	int retry_max;			/* maximum number of retries */
77 
78 	enum evhttp_connection_state state;
79 
80 	/* for server connections, the http server they are connected with */
81 	struct evhttp *http_server;
82 
83 	TAILQ_HEAD(evcon_requestq, evhttp_request) requests;
84 
85 						   void (*cb)(struct evhttp_connection *, void *);
86 	void *cb_arg;
87 
88 	void (*closecb)(struct evhttp_connection *, void *);
89 	void *closecb_arg;
90 
91 	struct event_base *base;
92 };
93 
94 struct evhttp_cb {
95 	TAILQ_ENTRY(evhttp_cb) next;
96 
97 	char *what;
98 
99 	void (*cb)(struct evhttp_request *req, void *);
100 	void *cbarg;
101 };
102 
103 /* both the http server as well as the rpc system need to queue connections */
104 TAILQ_HEAD(evconq, evhttp_connection);
105 
106 /* each bound socket is stored in one of these */
107 struct evhttp_bound_socket {
108 	TAILQ_ENTRY(evhttp_bound_socket) (next);
109 
110 	struct event  bind_ev;
111 };
112 
113 struct evhttp {
114 	TAILQ_HEAD(boundq, evhttp_bound_socket) sockets;
115 
116 	TAILQ_HEAD(httpcbq, evhttp_cb) callbacks;
117         struct evconq connections;
118 
119         int timeout;
120 
121 	void (*gencb)(struct evhttp_request *req, void *);
122 	void *gencbarg;
123 
124 	struct event_base *base;
125 };
126 
127 /* resets the connection; can be reused for more requests */
128 void evhttp_connection_reset(struct evhttp_connection *);
129 
130 /* connects if necessary */
131 int evhttp_connection_connect(struct evhttp_connection *);
132 
133 /* notifies the current request that it failed; resets connection */
134 void evhttp_connection_fail(struct evhttp_connection *,
135     enum evhttp_connection_error error);
136 
137 void evhttp_get_request(struct evhttp *, int, struct sockaddr *, socklen_t);
138 
139 int evhttp_hostportfile(char *, char **, u_short *, char **);
140 
141 int evhttp_parse_firstline(struct evhttp_request *, struct evbuffer*);
142 int evhttp_parse_headers(struct evhttp_request *, struct evbuffer*);
143 
144 void evhttp_start_read(struct evhttp_connection *);
145 void evhttp_make_header(struct evhttp_connection *, struct evhttp_request *);
146 
147 void evhttp_write_buffer(struct evhttp_connection *,
148     void (*)(struct evhttp_connection *, void *), void *);
149 
150 /* response sending HTML the data in the buffer */
151 void evhttp_response_code(struct evhttp_request *, int, const char *);
152 void evhttp_send_page(struct evhttp_request *, struct evbuffer *);
153 
154 #endif /* _HTTP_H */
155