204 lines
7.3 KiB
C
204 lines
7.3 KiB
C
/*
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LUFA Library
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Copyright (C) Dean Camera, 2017.
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dean [at] fourwalledcubicle [dot] com
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www.lufa-lib.org
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*/
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/*
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Copyright 2017 Dean Camera (dean [at] fourwalledcubicle [dot] com)
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Permission to use, copy, modify, distribute, and sell this
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software and its documentation for any purpose is hereby granted
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without fee, provided that the above copyright notice appear in
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all copies and that both that the copyright notice and this
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permission notice and warranty disclaimer appear in supporting
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documentation, and that the name of the author not be used in
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advertising or publicity pertaining to distribution of the
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software without specific, written prior permission.
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The author disclaims all warranties with regard to this
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software, including all implied warranties of merchantability
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and fitness. In no event shall the author be liable for any
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special, indirect or consequential damages or any damages
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whatsoever resulting from loss of use, data or profits, whether
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in an action of contract, negligence or other tortious action,
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arising out of or in connection with the use or performance of
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this software.
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*/
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/** \file
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*
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* Simple webserver application for demonstrating the RNDIS demo and TCP/IP stack. This
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* application will serve up a static HTTP webpage when requested by the host.
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*/
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#include "Webserver.h"
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/** HTTP server response header, for transmission before the page contents. This indicates to the host that a page exists at the
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* given location, and gives extra connection information.
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*/
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const char PROGMEM HTTP200Header[] = "HTTP/1.1 200 OK\r\n"
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"Server: LUFA RNDIS\r\n"
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"Content-type: text/html\r\n"
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"Connection: close\r\n\r\n";
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/** HTTP server response header, for transmission before a resource not found error. This indicates to the host that the given
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* given URL is invalid, and gives extra error information.
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*/
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const char PROGMEM HTTP404Header[] = "HTTP/1.1 404 Not Found\r\n"
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"Server: LUFA RNDIS\r\n"
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"Connection: close\r\n\r\n";
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/** HTTP page to serve to the host when a HTTP request is made. This page is too long for a single response, thus it is automatically
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* broken up into smaller blocks and sent as a series of packets each time the webserver application callback is run.
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*/
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const char PROGMEM HTTPPage[] =
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"<html>"
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" <head>"
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" <title>"
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" LUFA Webserver Demo"
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" </title>"
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" </head>"
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" <body>"
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" <h1>Hello from your USB AVR!</h1>"
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" <p>"
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" Hello! Welcome to the LUFA RNDIS Demo Webserver test page, running on your USB AVR via the LUFA library. This demonstrates the HTTP webserver, TCP/IP stack and RNDIS demo all running atop the LUFA USB stack."
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" <br /><br />"
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" <small>Project Information: <a href=\"http://www.lufa-lib.org\">http://www.lufa-lib.org</a>.</small>"
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" <hr />"
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" <i>LUFA Version: </i>" LUFA_VERSION_STRING
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" </p>"
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" </body>"
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"</html>";
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/** Initializes the Webserver application, opening the appropriate HTTP port in the TCP handler and registering the application
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* callback routine for packets sent to the HTTP protocol port.
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*/
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void Webserver_Init(void)
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{
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/* Open the HTTP port in the TCP protocol so that HTTP connections to the device can be established */
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TCP_SetPortState(TCP_PORT_HTTP, TCP_Port_Open, Webserver_ApplicationCallback);
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}
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/** Indicates if a given request equals the given HTTP command.
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*
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* \param[in] RequestHeader HTTP request made by the host
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* \param[in] Command HTTP command to compare the request to
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*
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* \return Boolean \c true if the command matches the request, \c false otherwise
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*/
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static bool IsHTTPCommand(uint8_t* RequestHeader,
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char* Command)
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{
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/* Returns true if the non null terminated string in RequestHeader matches the null terminated string Command */
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return (strncmp((char*)RequestHeader, Command, strlen(Command)) == 0);
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}
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/** Application callback routine, executed each time the TCP processing task runs. This callback determines what request
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* has been made (if any), and serves up appropriate responses.
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*
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* \param[in] ConnectionState Pointer to a TCP Connection State structure giving connection information
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* \param[in,out] Buffer Pointer to the application's send/receive packet buffer
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*/
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void Webserver_ApplicationCallback(TCP_ConnectionState_t* const ConnectionState,
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TCP_ConnectionBuffer_t* const Buffer)
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{
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char* BufferDataStr = (char*)Buffer->Data;
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static uint8_t PageBlock = 0;
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/* Check to see if a packet has been received on the HTTP port from a remote host */
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if (TCP_APP_HAS_RECEIVED_PACKET(Buffer))
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{
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if (IsHTTPCommand(Buffer->Data, "GET"))
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{
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if (IsHTTPCommand(Buffer->Data, "GET / "))
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{
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PageBlock = 0;
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/* Copy the HTTP 200 response header into the packet buffer */
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strcpy_P(BufferDataStr, HTTP200Header);
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/* Send the buffer contents to the host */
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TCP_APP_SEND_BUFFER(Buffer, strlen(BufferDataStr));
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/* Lock the buffer to Device->Host transmissions only while we send the page contents */
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TCP_APP_CAPTURE_BUFFER(Buffer);
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}
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else
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{
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/* Copy the HTTP 404 response header into the packet buffer */
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strcpy_P(BufferDataStr, HTTP404Header);
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/* Send the buffer contents to the host */
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TCP_APP_SEND_BUFFER(Buffer, strlen(BufferDataStr));
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/* All data sent, close the connection */
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TCP_APP_CLOSECONNECTION(ConnectionState);
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}
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}
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else if (IsHTTPCommand(Buffer->Data, "HEAD"))
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{
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if (IsHTTPCommand(Buffer->Data, "HEAD / "))
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{
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/* Copy the HTTP response header into the packet buffer */
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strcpy_P(BufferDataStr, HTTP200Header);
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/* Send the buffer contents to the host */
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TCP_APP_SEND_BUFFER(Buffer, strlen(BufferDataStr));
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}
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else
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{
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/* Copy the HTTP response header into the packet buffer */
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strcpy_P(BufferDataStr, HTTP404Header);
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/* Send the buffer contents to the host */
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TCP_APP_SEND_BUFFER(Buffer, strlen(BufferDataStr));
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}
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/* All data sent, close the connection */
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TCP_APP_CLOSECONNECTION(ConnectionState);
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}
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else if (IsHTTPCommand(Buffer->Data, "TRACE"))
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{
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/* Echo the host's query back to the host */
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TCP_APP_SEND_BUFFER(Buffer, Buffer->Length);
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/* All data sent, close the connection */
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TCP_APP_CLOSECONNECTION(ConnectionState);
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}
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else
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{
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/* Unknown request, just clear the buffer (drop the packet) */
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TCP_APP_CLEAR_BUFFER(Buffer);
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}
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}
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else if (TCP_APP_HAVE_CAPTURED_BUFFER(Buffer))
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{
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uint16_t RemLength = strlen_P(&HTTPPage[PageBlock * HTTP_REPLY_BLOCK_SIZE]);
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uint16_t Length;
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/* Determine the length of the loaded block */
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Length = MIN(RemLength, HTTP_REPLY_BLOCK_SIZE);
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/* Copy the next buffer sized block of the page to the packet buffer */
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strncpy_P(BufferDataStr, &HTTPPage[PageBlock * HTTP_REPLY_BLOCK_SIZE], Length);
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/* Send the buffer contents to the host */
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TCP_APP_SEND_BUFFER(Buffer, Length);
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/* Check to see if the entire page has been sent */
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if (PageBlock++ == (sizeof(HTTPPage) / HTTP_REPLY_BLOCK_SIZE))
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{
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/* Unlock the buffer so that the host can fill it with future packets */
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TCP_APP_RELEASE_BUFFER(Buffer);
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/* Close the connection to the host */
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TCP_APP_CLOSECONNECTION(ConnectionState);
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}
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}
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}
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