/** * webclient.h * Header file for the HTTP client. * Author: Adam Dunkels * * 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. */ #ifndef __WEBCLIENT_H__ #define __WEBCLIENT_H__ #include #include #define WEBCLIENT_CONF_MAX_URLLEN 100 struct webclient_state { uint8 timer; uint8 state; uint8 httpflag; uint16 port; char host[40]; char file[WEBCLIENT_CONF_MAX_URLLEN]; uint16 getrequestptr; uint16 getrequestleft; char httpheaderline[200]; uint16 httpheaderlineptr; char mimetype[32]; }; /* 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. * * data A pointer to the data that has been received. * len The length of the data that has been received. */ void webclient_datahandler(char *data, uint16 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. * * 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). * * port The port number to which to connect, in host byte order. * * file A pointer to the name of the file to get. * * Return: 0 if the host name could not be found in the cache, or * if a TCP connection could not be created. * * Return: 1 if the connection was initiated. */ unsigned char webclient_get(const char *host, uint16 port, char *file); /* Close the currently open HTTP connection. */ void webclient_close(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__ */