2 * uhttpd - Tiny non-forking httpd - CGI handler
4 * Copyright (C) 2010 Jo-Philipp Wich <xm@subsignal.org>
6 * Licensed under the Apache License, Version 2.0 (the "License");
7 * you may not use this file except in compliance with the License.
8 * You may obtain a copy of the License at
10 * http://www.apache.org/licenses/LICENSE-2.0
12 * Unless required by applicable law or agreed to in writing, software
13 * distributed under the License is distributed on an "AS IS" BASIS,
14 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
15 * See the License for the specific language governing permissions and
16 * limitations under the License.
20 #include "uhttpd-utils.h"
21 #include "uhttpd-cgi.h"
23 static struct http_response
* uh_cgi_header_parse(char *buf
, int len
, int *off
)
30 static struct http_response res
;
33 if( ((bufptr
= strfind(buf
, len
, "\r\n\r\n", 4)) != NULL
) ||
34 ((bufptr
= strfind(buf
, len
, "\n\n", 2)) != NULL
)
36 *off
= (int)(bufptr
- buf
) + ((bufptr
[0] == '\r') ? 4 : 2);
38 memset(&res
, 0, sizeof(res
));
45 for( pos
= 0; pos
< len
; pos
++ )
47 if( !hdrname
&& (buf
[pos
] == ':') )
51 if( (pos
< len
) && (buf
[pos
] == ' ') )
61 else if( (buf
[pos
] == '\r') || (buf
[pos
] == '\n') )
68 if( (pos
< len
) && (buf
[pos
] == '\n') )
73 if( (hdrcount
+ 1) < array_size(res
.headers
) )
75 if( ! strcasecmp(hdrname
, "Status") )
77 res
.statuscode
= atoi(bufptr
);
79 if( res
.statuscode
< 100 )
82 if( ((bufptr
= strchr(bufptr
, ' ')) != NULL
) && (&bufptr
[1] != 0) )
83 res
.statusmsg
= &bufptr
[1];
87 res
.headers
[hdrcount
++] = hdrname
;
88 res
.headers
[hdrcount
++] = bufptr
;
108 static char * uh_cgi_header_lookup(struct http_response
*res
, const char *hdrname
)
112 foreach_header(i
, res
->headers
)
114 if( ! strcasecmp(res
->headers
[i
], hdrname
) )
115 return res
->headers
[i
+1];
121 static void uh_cgi_error_500(struct client
*cl
, struct http_request
*req
, const char *message
)
123 uh_http_sendf(cl
, NULL
,
124 "HTTP/%.1f 500 Internal Server Error\r\n"
125 "Content-Type: text/plain\r\n%s\r\n",
128 ? "Transfer-Encoding: chunked\r\n" : ""
131 uh_http_send(cl
, req
, message
, -1);
135 void uh_cgi_request(struct client
*cl
, struct http_request
*req
, struct uh_path_info
*pi
)
137 int i
, hdroff
, bufoff
;
141 int content_length
= 0;
144 int rfd
[2] = { 0, 0 };
145 int wfd
[2] = { 0, 0 };
147 char buf
[UH_LIMIT_MSGHEAD
];
148 char hdr
[UH_LIMIT_MSGHEAD
];
153 struct timeval timeout
;
154 struct http_response
*res
;
157 /* spawn pipes for me->child, child->me */
158 if( (pipe(rfd
) < 0) || (pipe(wfd
) < 0) )
160 uh_http_sendhf(cl
, 500, "Internal Server Error",
161 "Failed to create pipe: %s", strerror(errno
));
163 if( rfd
[0] > 0 ) close(rfd
[0]);
164 if( rfd
[1] > 0 ) close(rfd
[1]);
165 if( wfd
[0] > 0 ) close(wfd
[0]);
166 if( wfd
[1] > 0 ) close(wfd
[1]);
171 /* fork off child process */
176 uh_http_sendhf(cl
, 500, "Internal Server Error",
177 "Failed to fork child: %s", strerror(errno
));
186 /* patch stdout and stdin to pipes */
190 /* check for regular, world-executable file */
191 if( (pi
->stat
.st_mode
& S_IFREG
) &&
192 (pi
->stat
.st_mode
& S_IXOTH
)
194 /* build environment */
197 /* common information */
198 setenv("GATEWAY_INTERFACE", "CGI/1.1", 1);
199 setenv("SERVER_SOFTWARE", "uHTTPd", 1);
200 setenv("PATH", "/sbin:/usr/sbin:/bin:/usr/bin", 1);
205 setenv("HTTPS", "on", 1);
209 setenv("SERVER_NAME", sa_straddr(&cl
->servaddr
), 1);
210 setenv("SERVER_ADDR", sa_straddr(&cl
->servaddr
), 1);
211 setenv("SERVER_PORT", sa_strport(&cl
->servaddr
), 1);
212 setenv("REMOTE_HOST", sa_straddr(&cl
->peeraddr
), 1);
213 setenv("REMOTE_ADDR", sa_straddr(&cl
->peeraddr
), 1);
214 setenv("REMOTE_PORT", sa_strport(&cl
->peeraddr
), 1);
216 /* path information */
217 setenv("SCRIPT_NAME", pi
->name
, 1);
218 setenv("SCRIPT_FILENAME", pi
->phys
, 1);
219 setenv("DOCUMENT_ROOT", pi
->root
, 1);
220 setenv("QUERY_STRING", pi
->query
? pi
->query
: "", 1);
223 setenv("PATH_INFO", pi
->info
, 1);
227 if( req
->version
> 1.0 )
228 setenv("SERVER_PROTOCOL", "HTTP/1.1", 1);
230 setenv("SERVER_PROTOCOL", "HTTP/1.0", 1);
233 switch( req
->method
)
235 case UH_HTTP_MSG_GET
:
236 setenv("REQUEST_METHOD", "GET", 1);
239 case UH_HTTP_MSG_HEAD
:
240 setenv("REQUEST_METHOD", "HEAD", 1);
243 case UH_HTTP_MSG_POST
:
244 setenv("REQUEST_METHOD", "POST", 1);
249 setenv("REQUEST_URI", req
->url
, 1);
251 /* request message headers */
252 foreach_header(i
, req
->headers
)
254 if( ! strcasecmp(req
->headers
[i
], "Accept") )
255 setenv("HTTP_ACCEPT", req
->headers
[i
+1], 1);
257 else if( ! strcasecmp(req
->headers
[i
], "Accept-Charset") )
258 setenv("HTTP_ACCEPT_CHARSET", req
->headers
[i
+1], 1);
260 else if( ! strcasecmp(req
->headers
[i
], "Accept-Encoding") )
261 setenv("HTTP_ACCEPT_ENCODING", req
->headers
[i
+1], 1);
263 else if( ! strcasecmp(req
->headers
[i
], "Accept-Language") )
264 setenv("HTTP_ACCEPT_LANGUAGE", req
->headers
[i
+1], 1);
266 else if( ! strcasecmp(req
->headers
[i
], "Authorization") )
267 setenv("HTTP_AUTHORIZATION", req
->headers
[i
+1], 1);
269 else if( ! strcasecmp(req
->headers
[i
], "Connection") )
270 setenv("HTTP_CONNECTION", req
->headers
[i
+1], 1);
272 else if( ! strcasecmp(req
->headers
[i
], "Cookie") )
273 setenv("HTTP_COOKIE", req
->headers
[i
+1], 1);
275 else if( ! strcasecmp(req
->headers
[i
], "Host") )
276 setenv("HTTP_HOST", req
->headers
[i
+1], 1);
278 else if( ! strcasecmp(req
->headers
[i
], "Referer") )
279 setenv("HTTP_REFERER", req
->headers
[i
+1], 1);
281 else if( ! strcasecmp(req
->headers
[i
], "User-Agent") )
282 setenv("HTTP_USER_AGENT", req
->headers
[i
+1], 1);
284 else if( ! strcasecmp(req
->headers
[i
], "Content-Type") )
285 setenv("CONTENT_TYPE", req
->headers
[i
+1], 1);
287 else if( ! strcasecmp(req
->headers
[i
], "Content-Length") )
288 setenv("CONTENT_LENGTH", req
->headers
[i
+1], 1);
292 /* execute child code ... */
293 if( chdir(pi
->root
) )
296 execl(pi
->phys
, pi
->phys
, NULL
);
298 /* in case it fails ... */
300 "Status: 500 Internal Server Error\r\n\r\n"
301 "Unable to launch the requested CGI program:\n"
303 pi
->phys
, strerror(errno
)
311 "Status: 403 Forbidden\r\n\r\n"
312 "Access to this resource is forbidden\n"
322 /* parent; handle I/O relaying */
324 /* close unneeded pipe ends */
329 fd_max
= max(rfd
[0], wfd
[1]) + 1;
331 /* find content length */
332 if( req
->method
== UH_HTTP_MSG_POST
)
334 foreach_header(i
, req
->headers
)
336 if( ! strcasecmp(req
->headers
[i
], "Content-Length") )
338 content_length
= atoi(req
->headers
[i
+1]);
345 memset(hdr
, 0, sizeof(hdr
));
347 /* I/O loop, watch our pipe ends and dispatch child reads/writes from/to socket */
353 FD_SET(rfd
[0], &reader
);
354 FD_SET(wfd
[1], &writer
);
359 /* wait until we can read or write or both */
360 if( select(fd_max
, &reader
, (content_length
> -1) ? &writer
: NULL
, NULL
, &timeout
) > 0 )
362 /* ready to write to cgi program */
363 if( FD_ISSET(wfd
[1], &writer
) )
365 /* there is unread post data waiting */
366 if( content_length
> 0 )
368 /* read it from socket ... */
369 if( (buflen
= uh_tcp_recv(cl
, buf
, min(content_length
, sizeof(buf
)))) > 0 )
371 /* ... and write it to child's stdin */
372 if( write(wfd
[1], buf
, buflen
) < 0 )
375 content_length
-= buflen
;
378 /* unexpected eof! */
381 if( write(wfd
[1], "", 0) < 0 )
388 /* there is no more post data, close pipe to child's stdin */
396 /* ready to read from cgi program */
397 if( FD_ISSET(rfd
[0], &reader
) )
399 /* read data from child ... */
400 if( (buflen
= read(rfd
[0], buf
, sizeof(buf
))) > 0 )
402 /* we have not pushed out headers yet, parse input */
405 /* head buffer not full and no end yet */
406 if( hdrlen
< sizeof(hdr
) )
408 bufoff
= min(buflen
, sizeof(hdr
) - hdrlen
);
409 memcpy(&hdr
[hdrlen
], buf
, bufoff
);
418 /* try to parse header ... */
419 if( (res
= uh_cgi_header_parse(hdr
, hdrlen
, &hdroff
)) != NULL
)
422 uh_http_sendf(cl
, NULL
, "HTTP/%.1f %03d %s\r\n",
423 req
->version
, res
->statuscode
, res
->statusmsg
);
425 /* add Content-Type if no Location or Content-Type */
426 if( !uh_cgi_header_lookup(res
, "Location") &&
427 !uh_cgi_header_lookup(res
, "Content-Type")
429 uh_http_send(cl
, NULL
,
430 "Content-Type: text/plain\r\n", -1);
433 /* if request was HTTP 1.1 we'll respond chunked */
434 if( (req
->version
> 1.0) &&
435 !uh_cgi_header_lookup(res
, "Transfer-Encoding")
437 uh_http_send(cl
, NULL
,
438 "Transfer-Encoding: chunked\r\n", -1);
441 /* write headers from CGI program */
442 foreach_header(i
, res
->headers
)
444 uh_http_sendf(cl
, NULL
, "%s: %s\r\n",
445 res
->headers
[i
], res
->headers
[i
+1]);
448 /* terminate header */
449 uh_http_send(cl
, NULL
, "\r\n", -1);
451 /* push out remaining head buffer */
452 if( hdroff
< hdrlen
)
453 uh_http_send(cl
, req
, &hdr
[hdroff
], hdrlen
- hdroff
);
456 /* ... failed and head buffer exceeded */
457 else if( hdrlen
>= sizeof(hdr
) )
459 uh_cgi_error_500(cl
, req
,
460 "The CGI program generated an invalid response:\n\n");
462 uh_http_send(cl
, req
, hdr
, hdrlen
);
465 /* ... failed but free buffer space, try again */
471 /* push out remaining read buffer */
472 if( bufoff
< buflen
)
473 uh_http_send(cl
, req
, &buf
[bufoff
], buflen
- bufoff
);
480 /* headers complete, pass through buffer to socket */
481 uh_http_send(cl
, req
, buf
, buflen
);
484 /* looks like eof from child */
487 /* cgi script did not output useful stuff at all */
490 /* I would do this ...
492 * uh_cgi_error_500(cl, req,
493 * "The CGI program generated an "
494 * "invalid response:\n\n");
496 * ... but in order to stay as compatible as possible,
497 * treat whatever we got as text/plain response and
498 * build the required headers here.
501 uh_http_sendf(cl
, NULL
,
502 "HTTP/%.1f 200 OK\r\n"
503 "Content-Type: text/plain\r\n"
505 req
->version
, (req
->version
> 1.0)
506 ? "Transfer-Encoding: chunked\r\n" : ""
509 uh_http_send(cl
, req
, hdr
, hdrlen
);
512 /* send final chunk if we're in chunked transfer mode */
513 uh_http_send(cl
, req
, "", 0);
519 /* no activity for 3 seconds... looks dead */
522 uh_http_sendhf(cl
, 504, "Gateway Timeout",
523 "The CGI script took too long to produce a response");