release/src/router/dnscrypt/src/libevent/http-internal.h

   1 /*
   2  * Copyright 2001-2007 Niels Provos <provos@citi.umich.edu>
   3  * Copyright 2007-2012 Niels Provos and Nick Mathewson
   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_INTERNAL_H_
  11 #define _HTTP_INTERNAL_H_
  12
  13 #include "event2/event_struct.h"
  14 #include "util-internal.h"
  15 #include "defer-internal.h"
  16
  17 #define HTTP_CONNECT_TIMEOUT    45
  18 #define HTTP_WRITE_TIMEOUT      50
  19 #define HTTP_READ_TIMEOUT       50
  20
  21 #define HTTP_PREFIX             "http://"
  22 #define HTTP_DEFAULTPORT        80
  23
  24 enum message_read_status {
  25         ALL_DATA_READ = 1,
  26         MORE_DATA_EXPECTED = 0,
  27         DATA_CORRUPTED = -1,
  28         REQUEST_CANCELED = -2,
  29         DATA_TOO_LONG = -3
  30 };
  31
  32 enum evhttp_connection_error {
  33         EVCON_HTTP_TIMEOUT,
  34         EVCON_HTTP_EOF,
  35         EVCON_HTTP_INVALID_HEADER,
  36         EVCON_HTTP_BUFFER_ERROR,
  37         EVCON_HTTP_REQUEST_CANCEL
  38 };
  39
  40 struct evbuffer;
  41 struct addrinfo;
  42 struct evhttp_request;
  43
  44 /* Indicates an unknown request method. */
  45 #define _EVHTTP_REQ_UNKNOWN (1<<15)
  46
  47 enum evhttp_connection_state {
  48         EVCON_DISCONNECTED,     /**< not currently connected not trying either*/
  49         EVCON_CONNECTING,       /**< tries to currently connect */
  50         EVCON_IDLE,             /**< connection is established */
  51         EVCON_READING_FIRSTLINE,/**< reading Request-Line (incoming conn) or
  52                                  **< Status-Line (outgoing conn) */
  53         EVCON_READING_HEADERS,  /**< reading request/response headers */
  54         EVCON_READING_BODY,     /**< reading request/response body */
  55         EVCON_READING_TRAILER,  /**< reading request/response chunked trailer */
  56         EVCON_WRITING           /**< writing request/response headers/body */
  57 };
  58
  59 struct event_base;
  60
  61 /* A client or server connection. */
  62 struct evhttp_connection {
  63         /* we use this tailq only if this connection was created for an http
  64          * server */
  65         TAILQ_ENTRY(evhttp_connection) next;
  66
  67         evutil_socket_t fd;
  68         struct bufferevent *bufev;
  69
  70         struct event retry_ev;          /* for retrying connects */
  71
  72         char *bind_address;             /* address to use for binding the src */
  73         u_short bind_port;              /* local port for binding the src */
  74
  75         char *address;                  /* address to connect to */
  76         u_short port;
  77
  78         size_t max_headers_size;
  79         ev_uint64_t max_body_size;
  80
  81         int flags;
  82 #define EVHTTP_CON_INCOMING     0x0001  /* only one request on it ever */
  83 #define EVHTTP_CON_OUTGOING     0x0002  /* multiple requests possible */
  84 #define EVHTTP_CON_CLOSEDETECT  0x0004  /* detecting if persistent close */
  85
  86         int timeout;                    /* timeout in seconds for events */
  87         int retry_cnt;                  /* retry count */
  88         int retry_max;                  /* maximum number of retries */
  89
  90         enum evhttp_connection_state state;
  91
  92         /* for server connections, the http server they are connected with */
  93         struct evhttp *http_server;
  94
  95         TAILQ_HEAD(evcon_requestq, evhttp_request) requests;
  96
  97         void (*cb)(struct evhttp_connection *, void *);
  98         void *cb_arg;
  99
 100         void (*closecb)(struct evhttp_connection *, void *);
 101         void *closecb_arg;
 102
 103         struct deferred_cb read_more_deferred_cb;
 104
 105         struct event_base *base;
 106         struct evdns_base *dns_base;
 107 };
 108
 109 /* A callback for an http server */
 110 struct evhttp_cb {
 111         TAILQ_ENTRY(evhttp_cb) next;
 112
 113         char *what;
 114
 115         void (*cb)(struct evhttp_request *req, void *);
 116         void *cbarg;
 117 };
 118
 119 /* both the http server as well as the rpc system need to queue connections */
 120 TAILQ_HEAD(evconq, evhttp_connection);
 121
 122 /* each bound socket is stored in one of these */
 123 struct evhttp_bound_socket {
 124         TAILQ_ENTRY(evhttp_bound_socket) next;
 125
 126         struct evconnlistener *listener;
 127 };
 128
 129 /* server alias list item. */
 130 struct evhttp_server_alias {
 131         TAILQ_ENTRY(evhttp_server_alias) next;
 132
 133         char *alias; /* the server alias. */
 134 };
 135
 136 struct evhttp {
 137         /* Next vhost, if this is a vhost. */
 138         TAILQ_ENTRY(evhttp) next_vhost;
 139
 140         /* All listeners for this host */
 141         TAILQ_HEAD(boundq, evhttp_bound_socket) sockets;
 142
 143         TAILQ_HEAD(httpcbq, evhttp_cb) callbacks;
 144
 145         /* All live connections on this host. */
 146         struct evconq connections;
 147
 148         TAILQ_HEAD(vhostsq, evhttp) virtualhosts;
 149
 150         TAILQ_HEAD(aliasq, evhttp_server_alias) aliases;
 151
 152         /* NULL if this server is not a vhost */
 153         char *vhost_pattern;
 154
 155         int timeout;
 156
 157         size_t default_max_headers_size;
 158         ev_uint64_t default_max_body_size;
 159
 160         /* Bitmask of all HTTP methods that we accept and pass to user
 161          * callbacks. */
 162         ev_uint16_t allowed_methods;
 163
 164         /* Fallback callback if all the other callbacks for this connection
 165            don't match. */
 166         void (*gencb)(struct evhttp_request *req, void *);
 167         void *gencbarg;
 168
 169         struct event_base *base;
 170 };
 171
 172 /* XXX most of these functions could be static. */
 173
 174 /* resets the connection; can be reused for more requests */
 175 void evhttp_connection_reset(struct evhttp_connection *);
 176
 177 /* connects if necessary */
 178 int evhttp_connection_connect(struct evhttp_connection *);
 179
 180 /* notifies the current request that it failed; resets connection */
 181 void evhttp_connection_fail(struct evhttp_connection *,
 182     enum evhttp_connection_error error);
 183
 184 enum message_read_status;
 185
 186 enum message_read_status evhttp_parse_firstline(struct evhttp_request *, struct evbuffer*);
 187 enum message_read_status evhttp_parse_headers(struct evhttp_request *, struct evbuffer*);
 188
 189 void evhttp_start_read(struct evhttp_connection *);
 190
 191 /* response sending HTML the data in the buffer */
 192 void evhttp_response_code(struct evhttp_request *, int, const char *);
 193 void evhttp_send_page(struct evhttp_request *, struct evbuffer *);
 194
 195 #endif /* _HTTP_H */