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povik |
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/** |
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* \addtogroup exampleapps |
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* @{ |
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*/ |
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/** |
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* \defgroup httpd Web server |
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* @{ |
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* |
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* The uIP web server is a very simplistic implementation of an HTTP |
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* server. It can serve web pages and files from a read-only ROM |
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* filesystem, and provides a very small scripting language. |
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* |
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* The script language is very simple and works as follows. Each |
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* script line starts with a command character, either "i", "t", "c", |
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* "#" or ".". The "i" command tells the script interpreter to |
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* "include" a file from the virtual file system and output it to the |
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* web browser. The "t" command should be followed by a line of text |
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* that is to be output to the browser. The "c" command is used to |
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* call one of the C functions from the httpd-cgi.c file. A line that |
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* starts with a "#" is ignored (i.e., the "#" denotes a comment), and |
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* the "." denotes the last script line. |
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* |
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* The script that produces the file statistics page looks somewhat |
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* like this: |
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* |
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\code |
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i /header.html |
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t <h1>File statistics</h1><br><table width="100%"> |
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t <tr><td><a href="/index.html">/index.html</a></td><td> |
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c a /index.html |
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t </td></tr> <tr><td><a href="/cgi/files">/cgi/files</a></td><td> |
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c a /cgi/files |
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t </td></tr> <tr><td><a href="/cgi/tcp">/cgi/tcp</a></td><td> |
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c a /cgi/tcp |
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t </td></tr> <tr><td><a href="/404.html">/404.html</a></td><td> |
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c a /404.html |
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t </td></tr></table> |
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i /footer.plain |
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. |
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\endcode |
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* |
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*/ |
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/** |
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* \file |
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* HTTP server. |
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* \author Adam Dunkels <adam@dunkels.com> |
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*/ |
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/* |
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* Copyright (c) 2001, 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 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 |
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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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* This file is part of the uIP TCP/IP stack. |
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* |
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* $Id: httpd.c,v 1.28.2.6 2003/10/07 13:22:27 adam Exp $ |
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* |
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*/ |
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#include "stm32f10x.h" |
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#include "stm32_eval.h" |
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#include "uip.h" |
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#include "httpd.h" |
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#include "fs.h" |
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#include "fsdata.h" |
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#include "cgi.h" |
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#define NULL (void *)0 |
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/* The HTTP server states: */ |
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#define HTTP_NOGET 0 |
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#define HTTP_FILE 1 |
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#define HTTP_TEXT 2 |
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#define HTTP_FUNC 3 |
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#define HTTP_END 4 |
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#ifdef UIP_DEBUG |
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#include <stdio.h> |
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#define PRINT(x) printf("%s", x) |
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#define PRINTLN(x) printf("%s\n", x) |
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#else /* UIP_DEBUG */ |
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#define PRINT(x) |
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#define PRINTLN(x) |
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#endif /* DEBUG */ |
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struct httpd_state *hs; |
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extern const struct fsdata_file file_index_html; |
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extern const struct fsdata_file file_404_html; |
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extern const struct fsdata_file_noconst file_STM32_LED_html; |
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extern const struct fsdata_file_noconst file_STM32_StatusBar_html; |
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static void next_scriptline(void); |
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static void next_scriptstate(void); |
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#define ISO_G 0x47 |
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#define ISO_E 0x45 |
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#define ISO_T 0x54 |
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#define ISO_slash 0x2f |
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#define ISO_c 0x63 |
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#define ISO_g 0x67 |
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#define ISO_i 0x69 |
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#define ISO_space 0x20 |
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#define ISO_nl 0x0a |
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#define ISO_cr 0x0d |
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#define ISO_a 0x61 |
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#define ISO_t 0x74 |
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#define ISO_hash 0x23 |
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#define ISO_period 0x2e |
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char dataPresent; |
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char Digit1=0, Digit2=0, Digit3=0; |
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int ADCVal = 0; |
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/*-----------------------------------------------------------------------------------*/ |
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/** |
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* Initialize the web server. |
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* |
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* Starts to listen for incoming connection requests on TCP port 80. |
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*/ |
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/*-----------------------------------------------------------------------------------*/ |
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void |
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httpd_init(void) |
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{ |
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fs_init(); |
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/* Listen to port 80. */ |
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uip_listen(HTONS(80)); |
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dataPresent = 0; |
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} |
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/*-----------------------------------------------------------------------------------*/ |
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void |
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httpd_appcall(void) |
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{ |
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struct fs_file fsfile; |
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u8_t i; |
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switch(uip_conn->lport) { |
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/* This is the web server: */ |
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case HTONS(80): |
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/* Pick out the application state from the uip_conn structure. */ |
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hs = (struct httpd_state *)(uip_conn->appstate); |
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/* We use the uip_ test functions to deduce why we were |
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called. If uip_connected() is non-zero, we were called |
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because a remote host has connected to us. If |
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uip_newdata() is non-zero, we were called because the |
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remote host has sent us new data, and if uip_acked() is |
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non-zero, the remote host has acknowledged the data we |
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previously sent to it. */ |
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if(uip_connected()) { |
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/* Since we have just been connected with the remote host, we |
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reset the state for this connection. The ->count variable |
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contains the amount of data that is yet to be sent to the |
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remote host, and the ->state is set to HTTP_NOGET to signal |
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that we haven't received any HTTP GET request for this |
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connection yet. */ |
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hs->state = HTTP_NOGET; |
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hs->count = 0; |
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return; |
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} else if(uip_poll()) { |
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/* If we are polled 200 times, we abort the connection. This is |
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because we don't want connections lingering indefinately in |
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the system. */ |
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if(hs->count++ >= 200) { |
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// uip_abort(); |
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} |
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return; |
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} |
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else |
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if(uip_newdata() && hs->state == HTTP_NOGET) |
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{ |
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/* This is the first data we receive, and it should contain a |
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GET. */ |
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/* Check for GET. */ |
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if(uip_appdata[0] != ISO_G || |
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uip_appdata[1] != ISO_E || |
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uip_appdata[2] != ISO_T || |
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uip_appdata[3] != ISO_space) { |
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/* If it isn't a GET, we abort the connection. */ |
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uip_abort(); |
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return; |
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} |
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/* Find the file we are looking for. */ |
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for(i = 4; i < 40; ++i) { |
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if(uip_appdata[i] == ISO_space || |
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uip_appdata[i] == ISO_cr || |
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uip_appdata[i] == ISO_nl) { |
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uip_appdata[i] = 0; |
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break; |
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} |
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} |
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PRINT("request for file "); |
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PRINTLN(&uip_appdata[4]); |
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/* Check for a request for "/". */ |
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if(uip_appdata[4] == ISO_slash && |
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uip_appdata[5] == 0) { |
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fs_open(file_index_html.name, &fsfile); |
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} |
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else |
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{ |
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if(!fs_open((const char *)&uip_appdata[4], &fsfile)) { |
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PRINTLN("couldn't open file"); |
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fs_open(file_404_html.name, &fsfile); |
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} |
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} |
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/* LED command -------------------------------------------*/ |
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if(uip_appdata[4] == ISO_slash && |
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uip_appdata[5] == 0x6D /*m*/ && |
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uip_appdata[12] == 0x67 /*g*/) |
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{ |
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i = 16; |
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STM_EVAL_LEDOff(LED1); |
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STM_EVAL_LEDOff(LED2); |
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STM_EVAL_LEDOff(LED3); |
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STM_EVAL_LEDOff(LED4); |
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while(uip_appdata[i]!=0x48/*H*/) |
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{ |
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if(uip_appdata[i]==0x31 /*LED1*/) |
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{ |
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STM_EVAL_LEDOn(LED1); |
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} |
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if(uip_appdata[i]==0x32 /*LED2*/) |
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{ |
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STM_EVAL_LEDOn(LED2); |
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} |
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if(uip_appdata[i]==0x33 /*LED3*/) |
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{ |
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STM_EVAL_LEDOn(LED3); |
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} |
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if(uip_appdata[i]==0x34 /*LED4*/) |
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{ |
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STM_EVAL_LEDOn(LED4); |
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} |
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i++; |
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} |
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fs_open(file_STM32_LED_html.name, &fsfile); |
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} |
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/* ADC Status Bar -------------------------------------------*/ |
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if(uip_appdata[4] == ISO_slash && |
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uip_appdata[5] == 0x53 /*S*/ && |
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uip_appdata[11] == 0x53 /*S*/ && |
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uip_appdata[12] == 0x74 /*t*/) |
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{ |
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ADCVal = ADC_GetConversionValue(ADC1); |
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ADCVal = ADCVal/8; |
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Digit1= ADCVal/100; |
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Digit2= (ADCVal-(Digit1*100))/10; |
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Digit3= ADCVal-(Digit1*100)-(Digit2*10); |
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/* These are the "VAL" characters positions in the STM32_StatusBar.html |
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starting from file_STM32_StatusBar_html.name position */ |
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*((file_STM32_StatusBar_html.name)+1768) = 0x30 + Digit1; /* ADC value */ |
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*((file_STM32_StatusBar_html.name)+1769) = 0x30 + Digit2; /* ADC value */ |
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*((file_STM32_StatusBar_html.name)+1770) = 0x30 + Digit3; /* ADC value */ |
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fs_open(file_STM32_StatusBar_html.name, &fsfile); |
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} |
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if(uip_appdata[4] == ISO_slash && |
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uip_appdata[5] == ISO_c && |
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uip_appdata[6] == ISO_g && |
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uip_appdata[7] == ISO_i && |
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uip_appdata[8] == ISO_slash) |
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{ |
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/* If the request is for a file that starts with "/cgi/", we |
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prepare for invoking a script. */ |
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hs->script = fsfile.data; |
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next_scriptstate(); |
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} |
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else |
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{ |
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hs->script = NULL; |
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/* The web server is now no longer in the HTTP_NOGET state, but |
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in the HTTP_FILE state since is has now got the GET from |
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the client and will start transmitting the file. */ |
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hs->state = HTTP_FILE; |
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/* Point the file pointers in the connection state to point to |
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the first byte of the file. */ |
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hs->dataptr = fsfile.data; |
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hs->count = fsfile.len; |
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} |
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} |
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if(hs->state != HTTP_FUNC) { |
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/* Check if the client (remote end) has acknowledged any data that |
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we've previously sent. If so, we move the file pointer further |
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into the file and send back more data. If we are out of data to |
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send, we close the connection. */ |
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if(uip_acked()) { |
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if(hs->count >= uip_conn->len) { |
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hs->count -= uip_conn->len; |
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hs->dataptr += uip_conn->len; |
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} else { |
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hs->count = 0; |
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} |
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if(hs->count == 0) { |
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if(hs->script != NULL) { |
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next_scriptline(); |
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next_scriptstate(); |
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} else { |
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uip_close(); |
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} |
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} |
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} |
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} else |
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{ |
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358 |
/* Call the CGI function. */ |
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if(cgitab[hs->script[2] - ISO_a](uip_acked())) { |
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/* If the function returns non-zero, we jump to the next line |
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in the script. */ |
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next_scriptline(); |
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next_scriptstate(); |
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} |
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} |
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if(hs->state != HTTP_FUNC && !uip_poll()) { |
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/* Send a piece of data, but not more than the MSS of the |
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connection. */ |
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uip_send((u8_t*)hs->dataptr, hs->count); |
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dataPresent = 1; |
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} |
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374 |
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/* Finally, return to uIP. Our outgoing packet will soon be on its |
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way... */ |
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return; |
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378 |
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default: |
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380 |
/* Should never happen. */ |
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uip_abort(); |
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382 |
break; |
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383 |
} |
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384 |
} |
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385 |
/*-----------------------------------------------------------------------------------*/ |
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386 |
/* next_scriptline(): |
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387 |
* |
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388 |
* Reads the script until it finds a newline. */ |
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389 |
static void |
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390 |
next_scriptline(void) |
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391 |
{ |
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392 |
/* Loop until we find a newline character. */ |
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393 |
do { |
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394 |
++(hs->script); |
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|
395 |
} while(hs->script[0] != ISO_nl); |
|
|
396 |
|
|
|
397 |
/* Eat up the newline as well. */ |
|
|
398 |
++(hs->script); |
|
|
399 |
} |
|
|
400 |
/*-----------------------------------------------------------------------------------*/ |
|
|
401 |
/* next_sciptstate: |
|
|
402 |
* |
|
|
403 |
* Reads one line of script and decides what to do next. |
|
|
404 |
*/ |
|
|
405 |
static void |
|
|
406 |
next_scriptstate(void) |
|
|
407 |
{ |
|
|
408 |
struct fs_file fsfile; |
|
|
409 |
u8_t i; |
|
|
410 |
|
|
|
411 |
again: |
|
|
412 |
switch(hs->script[0]) { |
|
|
413 |
case ISO_t: |
|
|
414 |
/* Send a text string. */ |
|
|
415 |
hs->state = HTTP_TEXT; |
|
|
416 |
hs->dataptr = &hs->script[2]; |
|
|
417 |
|
|
|
418 |
/* Calculate length of string. */ |
|
|
419 |
for(i = 0; hs->dataptr[i] != ISO_nl; ++i); |
|
|
420 |
hs->count = i; |
|
|
421 |
break; |
|
|
422 |
case ISO_c: |
|
|
423 |
/* Call a function. */ |
|
|
424 |
hs->state = HTTP_FUNC; |
|
|
425 |
hs->dataptr = NULL; |
|
|
426 |
hs->count = 0; |
|
|
427 |
cgitab[hs->script[2] - ISO_a](0); |
|
|
428 |
break; |
|
|
429 |
case ISO_i: |
|
|
430 |
/* Include a file. */ |
|
|
431 |
hs->state = HTTP_FILE; |
|
|
432 |
if(!fs_open(&hs->script[2], &fsfile)) { |
|
|
433 |
uip_abort(); |
|
|
434 |
} |
|
|
435 |
hs->dataptr = fsfile.data; |
|
|
436 |
hs->count = fsfile.len; |
|
|
437 |
break; |
|
|
438 |
case ISO_hash: |
|
|
439 |
/* Comment line. */ |
|
|
440 |
next_scriptline(); |
|
|
441 |
goto again; |
|
|
442 |
//break; |
|
|
443 |
case ISO_period: |
|
|
444 |
/* End of script. */ |
|
|
445 |
hs->state = HTTP_END; |
|
|
446 |
uip_close(); |
|
|
447 |
break; |
|
|
448 |
default: |
|
|
449 |
uip_abort(); |
|
|
450 |
break; |
|
|
451 |
} |
|
|
452 |
} |
|
|
453 |
/*-----------------------------------------------------------------------------------*/ |
|
|
454 |
/** @} */ |
|
|
455 |
/** @} */ |