| /* |
| * Copyright (c) 2000-2004 Niels Provos <provos@citi.umich.edu> |
| * All rights reserved. |
| * |
| * Redistribution and use in source and binary forms, with or without |
| * modification, are permitted provided that the following conditions |
| * are met: |
| * 1. Redistributions of source code must retain the above copyright |
| * notice, this list of conditions and the following disclaimer. |
| * 2. Redistributions in binary form must reproduce the above copyright |
| * notice, this list of conditions and the following disclaimer in the |
| * documentation and/or other materials provided with the distribution. |
| * 3. The name of the author may not be used to endorse or promote products |
| * derived from this software without specific prior written permission. |
| * |
| * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR |
| * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES |
| * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. |
| * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, |
| * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT |
| * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, |
| * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY |
| * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT |
| * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF |
| * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. |
| */ |
| #ifndef _EVHTTP_H_ |
| #define _EVHTTP_H_ |
| |
| #include "event.h" |
| |
| #ifdef __cplusplus |
| extern "C" { |
| #endif |
| |
| #ifdef WIN32 |
| #define WIN32_LEAN_AND_MEAN |
| #include <winsock2.h> |
| #include <windows.h> |
| #undef WIN32_LEAN_AND_MEAN |
| #endif |
| |
| /** @file evhttp.h |
| * |
| * Basic support for HTTP serving. |
| * |
| * As libevent is a library for dealing with event notification and most |
| * interesting applications are networked today, I have often found the |
| * need to write HTTP code. The following prototypes and definitions provide |
| * an application with a minimal interface for making HTTP requests and for |
| * creating a very simple HTTP server. |
| */ |
| |
| /* Response codes */ |
| #define HTTP_OK 200 |
| #define HTTP_NOCONTENT 204 |
| #define HTTP_MOVEPERM 301 |
| #define HTTP_MOVETEMP 302 |
| #define HTTP_NOTMODIFIED 304 |
| #define HTTP_BADREQUEST 400 |
| #define HTTP_NOTFOUND 404 |
| #define HTTP_SERVUNAVAIL 503 |
| |
| struct evhttp; |
| struct evhttp_request; |
| struct evkeyvalq; |
| |
| /** Create a new HTTP server |
| * |
| * @param base (optional) the event base to receive the HTTP events |
| * @return a pointer to a newly initialized evhttp server structure |
| */ |
| struct evhttp *evhttp_new(struct event_base *base); |
| |
| /** |
| * Binds an HTTP server on the specified address and port. |
| * |
| * Can be called multiple times to bind the same http server |
| * to multiple different ports. |
| * |
| * @param http a pointer to an evhttp object |
| * @param address a string containing the IP address to listen(2) on |
| * @param port the port number to listen on |
| * @return 0 on success, -1 on failure |
| * @see evhttp_free() |
| */ |
| int evhttp_bind_socket(struct evhttp *http, const char *address, u_short port); |
| |
| /** |
| * Makes an HTTP server accept connections on the specified socket |
| * |
| * This may be useful to create a socket and then fork multiple instances |
| * of an http server, or when a socket has been communicated via file |
| * descriptor passing in situations where an http servers does not have |
| * permissions to bind to a low-numbered port. |
| * |
| * Can be called multiple times to have the http server listen to |
| * multiple different sockets. |
| * |
| * @param http a pointer to an evhttp object |
| * @param fd a socket fd that is ready for accepting connections |
| * @return 0 on success, -1 on failure. |
| * @see evhttp_free(), evhttp_bind_socket() |
| */ |
| int evhttp_accept_socket(struct evhttp *http, int fd); |
| |
| /** |
| * Free the previously created HTTP server. |
| * |
| * Works only if no requests are currently being served. |
| * |
| * @param http the evhttp server object to be freed |
| * @see evhttp_start() |
| */ |
| void evhttp_free(struct evhttp* http); |
| |
| /** Set a callback for a specified URI */ |
| void evhttp_set_cb(struct evhttp *, const char *, |
| void (*)(struct evhttp_request *, void *), void *); |
| |
| /** Removes the callback for a specified URI */ |
| int evhttp_del_cb(struct evhttp *, const char *); |
| |
| /** Set a callback for all requests that are not caught by specific callbacks |
| */ |
| void evhttp_set_gencb(struct evhttp *, |
| void (*)(struct evhttp_request *, void *), void *); |
| |
| /** |
| * Set the timeout for an HTTP request. |
| * |
| * @param http an evhttp object |
| * @param timeout_in_secs the timeout, in seconds |
| */ |
| void evhttp_set_timeout(struct evhttp *, int timeout_in_secs); |
| |
| /* Request/Response functionality */ |
| |
| /** |
| * Send an HTML error message to the client. |
| * |
| * @param req a request object |
| * @param error the HTTP error code |
| * @param reason a brief explanation of the error |
| */ |
| void evhttp_send_error(struct evhttp_request *req, int error, |
| const char *reason); |
| |
| /** |
| * Send an HTML reply to the client. |
| * |
| * @param req a request object |
| * @param code the HTTP response code to send |
| * @param reason a brief message to send with the response code |
| * @param databuf the body of the response |
| */ |
| void evhttp_send_reply(struct evhttp_request *req, int code, |
| const char *reason, struct evbuffer *databuf); |
| |
| /* Low-level response interface, for streaming/chunked replies */ |
| void evhttp_send_reply_start(struct evhttp_request *, int, const char *); |
| void evhttp_send_reply_chunk(struct evhttp_request *, struct evbuffer *); |
| void evhttp_send_reply_end(struct evhttp_request *); |
| |
| /** |
| * Start an HTTP server on the specified address and port |
| * |
| * DEPRECATED: it does not allow an event base to be specified |
| * |
| * @param address the address to which the HTTP server should be bound |
| * @param port the port number on which the HTTP server should listen |
| * @return an struct evhttp object |
| */ |
| struct evhttp *evhttp_start(const char *address, u_short port); |
| |
| /* |
| * Interfaces for making requests |
| */ |
| enum evhttp_cmd_type { EVHTTP_REQ_GET, EVHTTP_REQ_POST, EVHTTP_REQ_HEAD }; |
| |
| enum evhttp_request_kind { EVHTTP_REQUEST, EVHTTP_RESPONSE }; |
| |
| /** |
| * the request structure that a server receives. |
| * WARNING: expect this structure to change. I will try to provide |
| * reasonable accessors. |
| */ |
| struct evhttp_request { |
| #if defined(TAILQ_ENTRY) |
| TAILQ_ENTRY(evhttp_request) next; |
| #else |
| struct { |
| struct evhttp_request *tqe_next; |
| struct evhttp_request **tqe_prev; |
| } next; |
| #endif |
| |
| /* the connection object that this request belongs to */ |
| struct evhttp_connection *evcon; |
| int flags; |
| #define EVHTTP_REQ_OWN_CONNECTION 0x0001 |
| #define EVHTTP_PROXY_REQUEST 0x0002 |
| |
| struct evkeyvalq *input_headers; |
| struct evkeyvalq *output_headers; |
| |
| /* address of the remote host and the port connection came from */ |
| char *remote_host; |
| u_short remote_port; |
| |
| enum evhttp_request_kind kind; |
| enum evhttp_cmd_type type; |
| |
| char *uri; /* uri after HTTP request was parsed */ |
| |
| char major; /* HTTP Major number */ |
| char minor; /* HTTP Minor number */ |
| |
| int response_code; /* HTTP Response code */ |
| char *response_code_line; /* Readable response */ |
| |
| struct evbuffer *input_buffer; /* read data */ |
| ev_int64_t ntoread; |
| int chunked:1, /* a chunked request */ |
| userdone:1; /* the user has sent all data */ |
| |
| struct evbuffer *output_buffer; /* outgoing post or data */ |
| |
| /* Callback */ |
| void (*cb)(struct evhttp_request *, void *); |
| void *cb_arg; |
| |
| /* |
| * Chunked data callback - call for each completed chunk if |
| * specified. If not specified, all the data is delivered via |
| * the regular callback. |
| */ |
| void (*chunk_cb)(struct evhttp_request *, void *); |
| }; |
| |
| /** |
| * Creates a new request object that needs to be filled in with the request |
| * parameters. The callback is executed when the request completed or an |
| * error occurred. |
| */ |
| struct evhttp_request *evhttp_request_new( |
| void (*cb)(struct evhttp_request *, void *), void *arg); |
| |
| /** enable delivery of chunks to requestor */ |
| void evhttp_request_set_chunked_cb(struct evhttp_request *, |
| void (*cb)(struct evhttp_request *, void *)); |
| |
| /** Frees the request object and removes associated events. */ |
| void evhttp_request_free(struct evhttp_request *req); |
| |
| /** Returns the connection object associated with the request or NULL */ |
| struct evhttp_connection *evhttp_request_get_connection(struct evhttp_request *req); |
| |
| /** |
| * A connection object that can be used to for making HTTP requests. The |
| * connection object tries to establish the connection when it is given an |
| * http request object. |
| */ |
| struct evhttp_connection *evhttp_connection_new( |
| const char *address, unsigned short port); |
| |
| /** Frees an http connection */ |
| void evhttp_connection_free(struct evhttp_connection *evcon); |
| |
| /** sets the ip address from which http connections are made */ |
| void evhttp_connection_set_local_address(struct evhttp_connection *evcon, |
| const char *address); |
| |
| /** sets the local port from which http connections are made */ |
| void evhttp_connection_set_local_port(struct evhttp_connection *evcon, |
| unsigned short port); |
| |
| /** Sets the timeout for events related to this connection */ |
| void evhttp_connection_set_timeout(struct evhttp_connection *evcon, |
| int timeout_in_secs); |
| |
| /** Sets the retry limit for this connection - -1 repeats indefnitely */ |
| void evhttp_connection_set_retries(struct evhttp_connection *evcon, |
| int retry_max); |
| |
| /** Set a callback for connection close. */ |
| void evhttp_connection_set_closecb(struct evhttp_connection *evcon, |
| void (*)(struct evhttp_connection *, void *), void *); |
| |
| /** |
| * Associates an event base with the connection - can only be called |
| * on a freshly created connection object that has not been used yet. |
| */ |
| void evhttp_connection_set_base(struct evhttp_connection *evcon, |
| struct event_base *base); |
| |
| /** Get the remote address and port associated with this connection. */ |
| void evhttp_connection_get_peer(struct evhttp_connection *evcon, |
| char **address, u_short *port); |
| |
| /** The connection gets ownership of the request */ |
| int evhttp_make_request(struct evhttp_connection *evcon, |
| struct evhttp_request *req, |
| enum evhttp_cmd_type type, const char *uri); |
| |
| const char *evhttp_request_uri(struct evhttp_request *req); |
| |
| /* Interfaces for dealing with HTTP headers */ |
| |
| const char *evhttp_find_header(const struct evkeyvalq *, const char *); |
| int evhttp_remove_header(struct evkeyvalq *, const char *); |
| int evhttp_add_header(struct evkeyvalq *, const char *, const char *); |
| void evhttp_clear_headers(struct evkeyvalq *); |
| |
| /* Miscellaneous utility functions */ |
| |
| |
| /** |
| Helper function to encode a URI. |
| |
| The returned string must be freed by the caller. |
| |
| @param uri an unencoded URI |
| @return a newly allocated URI-encoded string |
| */ |
| char *evhttp_encode_uri(const char *uri); |
| |
| |
| /** |
| Helper function to decode a URI. |
| |
| The returned string must be freed by the caller. |
| |
| @param uri an encoded URI |
| @return a newly allocated unencoded URI |
| */ |
| char *evhttp_decode_uri(const char *uri); |
| |
| |
| /** |
| * Helper function to parse out arguments in a query. |
| * |
| * Parsing a uri like |
| * |
| * http://foo.com/?q=test&s=some+thing |
| * |
| * will result in two entries in the key value queue. |
| |
| * The first entry is: key="q", value="test" |
| * The second entry is: key="s", value="some thing" |
| * |
| * @param uri the request URI |
| * @param headers the head of the evkeyval queue |
| */ |
| void evhttp_parse_query(const char *uri, struct evkeyvalq *headers); |
| |
| |
| /** |
| * Escape HTML character entities in a string. |
| * |
| * Replaces <, >, ", ' and & with <, >, ", |
| * ' and & correspondingly. |
| * |
| * The returned string needs to be freed by the caller. |
| * |
| * @param html an unescaped HTML string |
| * @return an escaped HTML string |
| */ |
| char *evhttp_htmlescape(const char *html); |
| |
| #ifdef __cplusplus |
| } |
| #endif |
| |
| #endif /* _EVHTTP_H_ */ |
