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[/] [openrisc/] [trunk/] [rtos/] [freertos-6.1.1/] [Demo/] [uIP_Demo_Rowley_ARM7/] [uip/] [httpd.c] - Blame information for rev 583

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1 583 jeremybenn 
/**
2 
 * \addtogroup exampleapps
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 * @{
4 
 */
5 
 
6 
/**
7 
 * \defgroup httpd Web server
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 * @{
9 
 *
10 
 * The uIP web server is a very simplistic implementation of an HTTP
11 
 * server. It can serve web pages and files from a read-only ROM
12 
 * filesystem, and provides a very small scripting language.
13 
 *
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 * The script language is very simple and works as follows. Each
15 
 * 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
25 
 * 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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45 
 
46 
/**
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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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 */
51 
 
52 
/*
53 
 * 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
60 
 *    notice, this list of conditions and the following disclaimer.
61 
 * 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
75 
 * 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.
79 
 *
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 * This file is part of the uIP TCP/IP stack.
81 
 *
82 
 * $Id: httpd.c 2 2011-07-17 20:13:17Z filepang@gmail.com $
83 
 *
84 
 */
85 
 
86 
 
87 
#include "uip.h"
88 
#include "httpd.h"
89 
#include "fs.h"
90 
#include "fsdata.h"
91 
#include "cgi.h"
92 
 
93 
#define NULL (void *)0
94 
 
95 
/* The HTTP server states: */
96 
#define HTTP_NOGET        0
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#define HTTP_FILE         1
98 
#define HTTP_TEXT         2
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#define HTTP_FUNC         3
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#define HTTP_END          4
101 
 
102 
#ifdef DEBUG
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#include <stdio.h>
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#define PRINT(x)
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#define PRINTLN(x)
106 
#else /* DEBUG */
107 
#define PRINT(x)
108 
#define PRINTLN(x)
109 
#endif /* DEBUG */
110 
 
111 
struct httpd_state *hs;
112 
 
113 
extern const struct fsdata_file file_index_html;
114 
extern const struct fsdata_file file_404_html;
115 
 
116 
static void next_scriptline(void);
117 
static void next_scriptstate(void);
118 
 
119 
#define ISO_G        0x47
120 
#define ISO_E        0x45
121 
#define ISO_T        0x54
122 
#define ISO_slash    0x2f
123 
#define ISO_c        0x63
124 
#define ISO_g        0x67
125 
#define ISO_i        0x69
126 
#define ISO_space    0x20
127 
#define ISO_nl       0x0a
128 
#define ISO_cr       0x0d
129 
#define ISO_a        0x61
130 
#define ISO_t        0x74
131 
#define ISO_hash     0x23
132 
#define ISO_period   0x2e
133 
 
134 
#define httpPORT        80
135 
 
136 
/*-----------------------------------------------------------------------------------*/
137 
/**
138 
 * Initialize the web server.
139 
 *
140 
 * Starts to listen for incoming connection requests on TCP port 80.
141 
 */
142 
/*-----------------------------------------------------------------------------------*/
143 
void
144 
httpd_init(void)
145 
{
146 
  fs_init();
147 
 
148 
  /* Listen to port 80. */
149 
  uip_listen(HTONS(httpPORT));
150 
}
151 
/*-----------------------------------------------------------------------------------*/
152 
void
153 
httpd_appcall(void)
154 
{
155 
  struct fs_file fsfile;
156 
 
157 
  u8_t i;
158 
 
159 
  switch(uip_conn->lport) {
160 
    /* This is the web server: */
161 
  case HTONS(httpPORT):
162 
    /* Pick out the application state from the uip_conn structure. */
163 
    hs = (struct httpd_state *)(uip_conn->appstate);
164 
 
165 
    /* We use the uip_ test functions to deduce why we were
166 
       called. If uip_connected() is non-zero, we were called
167 
       because a remote host has connected to us. If
168 
       uip_newdata() is non-zero, we were called because the
169 
       remote host has sent us new data, and if uip_acked() is
170 
       non-zero, the remote host has acknowledged the data we
171 
       previously sent to it. */
172 
    if(uip_connected()) {
173 
      /* Since we have just been connected with the remote host, we
174 
         reset the state for this connection. The ->count variable
175 
         contains the amount of data that is yet to be sent to the
176 
         remote host, and the ->state is set to HTTP_NOGET to signal
177 
         that we haven't received any HTTP GET request for this
178 
         connection yet. */
179 
 
180 
      hs->state = HTTP_NOGET;
181 
      hs->count = 0;
182 
      return;
183 
 
184 
    } else if(uip_poll()) {
185 
      /* If we are polled ten times, we abort the connection. This is
186 
         because we don't want connections lingering indefinately in
187 
         the system. */
188 
      if(hs->count++ >= 10) {
189 
        uip_abort();
190 
      }
191 
      return;
192 
    } else if(uip_newdata() && hs->state == HTTP_NOGET) {
193 
      /* This is the first data we receive, and it should contain a
194 
         GET. */
195 
 
196 
      /* Check for GET. */
197 
      if(uip_appdata[0] != ISO_G ||
198 
         uip_appdata[1] != ISO_E ||
199 
         uip_appdata[2] != ISO_T ||
200 
         uip_appdata[3] != ISO_space) {
201 
        /* If it isn't a GET, we abort the connection. */
202 
        uip_abort();
203 
        return;
204 
      }
205 
 
206 
      /* Find the file we are looking for. */
207 
      for(i = 4; i < 40; ++i) {
208 
        if(uip_appdata[i] == ISO_space ||
209 
           uip_appdata[i] == ISO_cr ||
210 
           uip_appdata[i] == ISO_nl) {
211 
          uip_appdata[i] = 0;
212 
          break;
213 
        }
214 
      }
215 
 
216 
      PRINT("request for file ");
217 
      PRINTLN(&uip_appdata[4]);
218 
 
219 
      /* Check for a request for "/". */
220 
      if(uip_appdata[4] == ISO_slash &&
221 
         uip_appdata[5] == 0) {
222 
        fs_open(file_index_html.name, &fsfile);
223 
      } else {
224 
        if(!fs_open((const char *)&uip_appdata[4], &fsfile)) {
225 
          PRINTLN("couldn't open file");
226 
          fs_open(file_404_html.name, &fsfile);
227 
        }
228 
      }
229 
 
230 
 
231 
      if(uip_appdata[4] == ISO_slash &&
232 
         uip_appdata[5] == ISO_c &&
233 
         uip_appdata[6] == ISO_g &&
234 
         uip_appdata[7] == ISO_i &&
235 
         uip_appdata[8] == ISO_slash) {
236 
        /* If the request is for a file that starts with "/cgi/", we
237 
           prepare for invoking a script. */
238 
        hs->script = fsfile.data;
239 
        next_scriptstate();
240 
      } else {
241 
        hs->script = NULL;
242 
        /* The web server is now no longer in the HTTP_NOGET state, but
243 
           in the HTTP_FILE state since is has now got the GET from
244 
           the client and will start transmitting the file. */
245 
        hs->state = HTTP_FILE;
246 
 
247 
        /* Point the file pointers in the connection state to point to
248 
           the first byte of the file. */
249 
        hs->dataptr = fsfile.data;
250 
        hs->count = fsfile.len;
251 
      }
252 
    }
253 
 
254 
 
255 
    if(hs->state != HTTP_FUNC) {
256 
      /* Check if the client (remote end) has acknowledged any data that
257 
         we've previously sent. If so, we move the file pointer further
258 
         into the file and send back more data. If we are out of data to
259 
         send, we close the connection. */
260 
      if(uip_acked()) {
261 
        if(hs->count >= uip_conn->len) {
262 
          hs->count -= uip_conn->len;
263 
          hs->dataptr += uip_conn->len;
264 
        } else {
265 
          hs->count = 0;
266 
        }
267 
 
268 
        if(hs->count == 0) {
269 
          if(hs->script != NULL) {
270 
            next_scriptline();
271 
            next_scriptstate();
272 
          } else {
273 
            uip_close();
274 
          }
275 
        }
276 
      }
277 
    } else {
278 
      /* Call the CGI function. */
279 
      if(cgitab[hs->script[2] - ISO_a](uip_acked())) {
280 
        /* If the function returns non-zero, we jump to the next line
281 
           in the script. */
282 
        next_scriptline();
283 
        next_scriptstate();
284 
      }
285 
    }
286 
 
287 
    if(hs->state != HTTP_FUNC && !uip_poll()) {
288 
      /* Send a piece of data, but not more than the MSS of the
289 
         connection. */
290 
      uip_send(hs->dataptr, hs->count);
291 
    }
292 
 
293 
    /* Finally, return to uIP. Our outgoing packet will soon be on its
294 
       way... */
295 
    return;
296 
 
297 
  default:
298 
    /* Should never happen. */
299 
    uip_abort();
300 
    break;
301 
  }
302 
}
303 
/*-----------------------------------------------------------------------------------*/
304 
/* next_scriptline():
305 
 *
306 
 * Reads the script until it finds a newline. */
307 
static void
308 
next_scriptline(void)
309 
{
310 
  /* Loop until we find a newline character. */
311 
  do {
312 
    ++(hs->script);
313 
  } while(hs->script[0] != ISO_nl);
314 
 
315 
  /* Eat up the newline as well. */
316 
  ++(hs->script);
317 
}
318 
/*-----------------------------------------------------------------------------------*/
319 
/* next_sciptstate:
320 
 *
321 
 * Reads one line of script and decides what to do next.
322 
 */
323 
static void
324 
next_scriptstate(void)
325 
{
326 
  struct fs_file fsfile;
327 
  u8_t i;
328 
 
329 
 again:
330 
  switch(hs->script[0]) {
331 
  case ISO_t:
332 
    /* Send a text string. */
333 
    hs->state = HTTP_TEXT;
334 
    hs->dataptr = &hs->script[2];
335 
 
336 
    /* Calculate length of string. */
337 
    for(i = 0; hs->dataptr[i] != ISO_nl; ++i);
338 
    hs->count = i;
339 
    break;
340 
  case ISO_c:
341 
    /* Call a function. */
342 
    hs->state = HTTP_FUNC;
343 
    hs->dataptr = NULL;
344 
    hs->count = 0;
345 
    cgitab[hs->script[2] - ISO_a](0);
346 
    break;
347 
  case ISO_i:
348 
    /* Include a file. */
349 
    hs->state = HTTP_FILE;
350 
    if(!fs_open(&hs->script[2], &fsfile)) {
351 
      uip_abort();
352 
    }
353 
    hs->dataptr = fsfile.data;
354 
    hs->count = fsfile.len;
355 
    break;
356 
  case ISO_hash:
357 
    /* Comment line. */
358 
    next_scriptline();
359 
    goto again;
360 
    break;
361 
  case ISO_period:
362 
    /* End of script. */
363 
    hs->state = HTTP_END;
364 
    uip_close();
365 
    break;
366 
  default:
367 
    uip_abort();
368 
    break;
369 
  }
370 
}
371 
/*-----------------------------------------------------------------------------------*/
372 
/** @} */
373 
/** @} */

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