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