206 lines
6.7 KiB
C
206 lines
6.7 KiB
C
/**
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* webclient.h
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* Header file for the HTTP client.
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* Author: Adam Dunkels <adam@dunkels.com>
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*
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* Copyright (c) 2002, Adam Dunkels.
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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
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* copyright notice, this list of conditions and the following
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* disclaimer in the documentation and/or other materials provided
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* with the distribution.
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* 3. The name of the author may not be used to endorse or promote
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* products derived from this software without specific prior
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* written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS
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* OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
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* WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY
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* DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE
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* GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
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* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
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* WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
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* NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
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* SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*/
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#ifndef __WEBCLIENT_H__
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#define __WEBCLIENT_H__
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#include <sys/types.h>
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#include <net/uip/uipopt.h>
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#define WEBCLIENT_CONF_MAX_URLLEN 100
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struct webclient_state
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{
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uint8 timer;
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uint8 state;
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uint8 httpflag;
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uint16 port;
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char host[40];
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char file[WEBCLIENT_CONF_MAX_URLLEN];
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uint16 getrequestptr;
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uint16 getrequestleft;
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char httpheaderline[200];
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uint16 httpheaderlineptr;
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char mimetype[32];
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};
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/* Callback function that is called from the webclient code when HTTP
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* data has been received.
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*
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* This function must be implemented by the module that uses the
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* webclient code. The function is called from the webclient module
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* when HTTP data has been received. The function is not called when
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* HTTP headers are received, only for the actual data.
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*
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* Note: This function is called many times, repetedly, when data is
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* being received, and not once when all data has been received.
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*
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* data A pointer to the data that has been received.
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* len The length of the data that has been received.
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*/
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void webclient_datahandler(char *data, uint16 len);
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/* Callback function that is called from the webclient code when the
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* HTTP connection has been connected to the web server.
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*
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* This function must be implemented by the module that uses the
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* webclient code.
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*/
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void webclient_connected(void);
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/* Callback function that is called from the webclient code if the
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* HTTP connection to the web server has timed out.
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*
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* This function must be implemented by the module that uses the
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* webclient code.
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*/
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void webclient_timedout(void);
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/* Callback function that is called from the webclient code if the
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* HTTP connection to the web server has been aborted by the web
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* server.
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*
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* This function must be implemented by the module that uses the
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* webclient code.
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*/
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void webclient_aborted(void);
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/* Callback function that is called from the webclient code when the
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* HTTP connection to the web server has been closed.
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*
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* This function must be implemented by the module that uses the
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* webclient code.
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*/
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void webclient_closed(void);
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/* Initialize the webclient module. */
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void webclient_init(void);
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/* Open an HTTP connection to a web server and ask for a file using
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* the GET method.
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*
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* This function opens an HTTP connection to the specified web server
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* and requests the specified file using the GET method. When the HTTP
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* connection has been connected, the webclient_connected() callback
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* function is called and when the HTTP data arrives the
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* webclient_datahandler() callback function is called.
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*
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* The callback function webclient_timedout() is called if the web
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* server could not be contacted, and the webclient_aborted() callback
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* function is called if the HTTP connection is aborted by the web
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* server.
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*
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* When the HTTP request has been completed and the HTTP connection is
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* closed, the webclient_closed() callback function will be called.
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*
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* Note: If the function is passed a host name, it must already be in
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* the resolver cache in order for the function to connect to the web
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* server. It is therefore up to the calling module to implement the
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* resolver calls and the signal handler used for reporting a resolv
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* query answer.
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*
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* host A pointer to a string containing either a host name or
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* a numerical IP address in dotted decimal notation (e.g., 192.168.23.1).
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*
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* port The port number to which to connect, in host byte order.
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*
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* file A pointer to the name of the file to get.
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*
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* Return: 0 if the host name could not be found in the cache, or
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* if a TCP connection could not be created.
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*
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* Return: 1 if the connection was initiated.
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*/
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unsigned char webclient_get(const char *host, uint16 port, char *file);
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/* Close the currently open HTTP connection. */
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void webclient_close(void);
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/* Obtain the MIME type of the current HTTP data stream.
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*
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* Return: A pointer to a string contaning the MIME type. The string
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* may be empty if no MIME type was reported by the web server.
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*/
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char *webclient_mimetype(void);
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/* Obtain the filename of the current HTTP data stream.
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*
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* The filename of an HTTP request may be changed by the web server,
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* and may therefore not be the same as when the original GET request
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* was made with webclient_get(). This function is used for obtaining
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* the current filename.
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*
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* Return: A pointer to the current filename.
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*/
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char *webclient_filename(void);
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/* Obtain the hostname of the current HTTP data stream.
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*
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* The hostname of the web server of an HTTP request may be changed
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* by the web server, and may therefore not be the same as when the
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* original GET request was made with webclient_get(). This function
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* is used for obtaining the current hostname.
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*
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* Return: A pointer to the current hostname.
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*/
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char *webclient_hostname(void);
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/* Obtain the port number of the current HTTP data stream.
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*
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* The port number of an HTTP request may be changed by the web
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* server, and may therefore not be the same as when the original GET
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* request was made with webclient_get(). This function is used for
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* obtaining the current port number.
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*
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* Return: The port number of the current HTTP data stream, in host byte order.
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*/
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unsigned short webclient_port(void);
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#endif /* __WEBCLIENT_H__ */
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