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http-internal.h
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,
41  EVCON_CONNECTING,
42  EVCON_IDLE,
43  EVCON_READING_FIRSTLINE,
45  EVCON_READING_HEADERS,
46  EVCON_READING_BODY,
47  EVCON_READING_TRAILER,
48  EVCON_WRITING
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 */