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/**
* \addtogroup webclient
* @{
*/
/**
* \file
* Header file for the HTTP client.
* \author Adam Dunkels <adam@dunkels.com>
*/
/*
* Copyright (c) 2002, Adam Dunkels.
* 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.
*
* This file is part of the uIP TCP/IP stack.
*
* $Id: webclient.h,v 1.2 2006/06/11 21:46:37 adam Exp $
*
*/
#ifndef __WEBCLIENT_H__
#define __WEBCLIENT_H__
#include "webclient-strings.h"
#include "uipopt.h"
#define WEBCLIENT_CONF_MAX_URLLEN 100
struct webclient_state {
u8_t timer;
u8_t state;
u8_t httpflag;
u16_t port;
char host[40];
char file[WEBCLIENT_CONF_MAX_URLLEN];
u16_t getrequestptr;
u16_t getrequestleft;
char httpheaderline[200];
u16_t httpheaderlineptr;
char mimetype[32];
};
typedef struct webclient_state uip_tcp_appstate_t;
#define UIP_APPCALL webclient_appcall
/**
* Callback function that is called from the webclient code when HTTP
* data has been received.
*
* This function must be implemented by the module that uses the
* webclient code. The function is called from the webclient module
* when HTTP data has been received. The function is not called when
* HTTP headers are received, only for the actual data.
*
* \note This function is called many times, repetedly, when data is
* being received, and not once when all data has been received.
*
* \param data A pointer to the data that has been received.
* \param len The length of the data that has been received.
*/
void webclient_datahandler(char *data, u16_t len);
/**
* Callback function that is called from the webclient code when the
* HTTP connection has been connected to the web server.
*
* This function must be implemented by the module that uses the
* webclient code.
*/
void webclient_connected(void);
/**
* Callback function that is called from the webclient code if the
* HTTP connection to the web server has timed out.
*
* This function must be implemented by the module that uses the
* webclient code.
*/
void webclient_timedout(void);
/**
* Callback function that is called from the webclient code if the
* HTTP connection to the web server has been aborted by the web
* server.
*
* This function must be implemented by the module that uses the
* webclient code.
*/
void webclient_aborted(void);
/**
* Callback function that is called from the webclient code when the
* HTTP connection to the web server has been closed.
*
* This function must be implemented by the module that uses the
* webclient code.
*/
void webclient_closed(void);
/**
* Initialize the webclient module.
*/
void webclient_init(void);
/**
* Open an HTTP connection to a web server and ask for a file using
* the GET method.
*
* This function opens an HTTP connection to the specified web server
* and requests the specified file using the GET method. When the HTTP
* connection has been connected, the webclient_connected() callback
* function is called and when the HTTP data arrives the
* webclient_datahandler() callback function is called.
*
* The callback function webclient_timedout() is called if the web
* server could not be contacted, and the webclient_aborted() callback
* function is called if the HTTP connection is aborted by the web
* server.
*
* When the HTTP request has been completed and the HTTP connection is
* closed, the webclient_closed() callback function will be called.
*
* \note If the function is passed a host name, it must already be in
* the resolver cache in order for the function to connect to the web
* server. It is therefore up to the calling module to implement the
* resolver calls and the signal handler used for reporting a resolv
* query answer.
*
* \param host A pointer to a string containing either a host name or
* a numerical IP address in dotted decimal notation (e.g., 192.168.23.1).
*
* \param port The port number to which to connect, in host byte order.
*
* \param file A pointer to the name of the file to get.
*
* \retval 0 if the host name could not be found in the cache, or
* if a TCP connection could not be created.
*
* \retval 1 if the connection was initiated.
*/
unsigned char webclient_get(char *host, u16_t port, char *file);
/**
* Close the currently open HTTP connection.
*/
void webclient_close(void);
void webclient_appcall(void);
/**
* Obtain the MIME type of the current HTTP data stream.
*
* \return A pointer to a string contaning the MIME type. The string
* may be empty if no MIME type was reported by the web server.
*/
char *webclient_mimetype(void);
/**
* Obtain the filename of the current HTTP data stream.
*
* The filename of an HTTP request may be changed by the web server,
* and may therefore not be the same as when the original GET request
* was made with webclient_get(). This function is used for obtaining
* the current filename.
*
* \return A pointer to the current filename.
*/
char *webclient_filename(void);
/**
* Obtain the hostname of the current HTTP data stream.
*
* The hostname of the web server of an HTTP request may be changed
* by the web server, and may therefore not be the same as when the
* original GET request was made with webclient_get(). This function
* is used for obtaining the current hostname.
*
* \return A pointer to the current hostname.
*/
char *webclient_hostname(void);
/**
* Obtain the port number of the current HTTP data stream.
*
* The port number of an HTTP request may be changed by the web
* server, and may therefore not be the same as when the original GET
* request was made with webclient_get(). This function is used for
* obtaining the current port number.
*
* \return The port number of the current HTTP data stream, in host byte order.
*/
unsigned short webclient_port(void);
#endif /* __WEBCLIENT_H__ */
/** @} */
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