2 * uhttpd - Tiny single-threaded 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 int uh_cgi_error_500(struct client
*cl
, struct http_request
*req
, const char *message
)
123 if( 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 return uh_http_send(cl
, req
, message
, -1);
139 struct client
*cl
, struct http_request
*req
,
140 struct path_info
*pi
, struct interpreter
*ip
142 int i
, hdroff
, bufoff
, rv
;
146 int content_length
= 0;
149 int rfd
[2] = { 0, 0 };
150 int wfd
[2] = { 0, 0 };
152 char buf
[UH_LIMIT_MSGHEAD
];
153 char hdr
[UH_LIMIT_MSGHEAD
];
161 struct timeval timeout
;
162 struct http_response
*res
;
165 /* spawn pipes for me->child, child->me */
166 if( (pipe(rfd
) < 0) || (pipe(wfd
) < 0) )
168 uh_http_sendhf(cl
, 500, "Internal Server Error",
169 "Failed to create pipe: %s", strerror(errno
));
171 if( rfd
[0] > 0 ) close(rfd
[0]);
172 if( rfd
[1] > 0 ) close(rfd
[1]);
173 if( wfd
[0] > 0 ) close(wfd
[0]);
174 if( wfd
[1] > 0 ) close(wfd
[1]);
179 /* fork off child process */
180 switch( (child
= fork()) )
184 uh_http_sendhf(cl
, 500, "Internal Server Error",
185 "Failed to fork child: %s", strerror(errno
));
190 /* restore SIGTERM */
192 sa
.sa_handler
= SIG_DFL
;
193 sigemptyset(&sa
.sa_mask
);
194 sigaction(SIGTERM
, &sa
, NULL
);
196 /* close loose pipe ends */
200 /* patch stdout and stdin to pipes */
204 /* check for regular, world-executable file _or_ interpreter */
205 if( ((pi
->stat
.st_mode
& S_IFREG
) &&
206 (pi
->stat
.st_mode
& S_IXOTH
)) || (ip
!= NULL
)
208 /* build environment */
211 /* common information */
212 setenv("GATEWAY_INTERFACE", "CGI/1.1", 1);
213 setenv("SERVER_SOFTWARE", "uHTTPd", 1);
214 setenv("PATH", "/sbin:/usr/sbin:/bin:/usr/bin", 1);
219 setenv("HTTPS", "on", 1);
223 setenv("SERVER_NAME", sa_straddr(&cl
->servaddr
), 1);
224 setenv("SERVER_ADDR", sa_straddr(&cl
->servaddr
), 1);
225 setenv("SERVER_PORT", sa_strport(&cl
->servaddr
), 1);
226 setenv("REMOTE_HOST", sa_straddr(&cl
->peeraddr
), 1);
227 setenv("REMOTE_ADDR", sa_straddr(&cl
->peeraddr
), 1);
228 setenv("REMOTE_PORT", sa_strport(&cl
->peeraddr
), 1);
230 /* path information */
231 setenv("SCRIPT_NAME", pi
->name
, 1);
232 setenv("SCRIPT_FILENAME", pi
->phys
, 1);
233 setenv("DOCUMENT_ROOT", pi
->root
, 1);
234 setenv("QUERY_STRING", pi
->query
? pi
->query
: "", 1);
237 setenv("PATH_INFO", pi
->info
, 1);
239 /* REDIRECT_STATUS, php-cgi wants it */
240 switch( req
->redirect_status
)
243 setenv("REDIRECT_STATUS", "404", 1);
247 setenv("REDIRECT_STATUS", "200", 1);
252 if( req
->version
> 1.0 )
253 setenv("SERVER_PROTOCOL", "HTTP/1.1", 1);
255 setenv("SERVER_PROTOCOL", "HTTP/1.0", 1);
258 switch( req
->method
)
260 case UH_HTTP_MSG_GET
:
261 setenv("REQUEST_METHOD", "GET", 1);
264 case UH_HTTP_MSG_HEAD
:
265 setenv("REQUEST_METHOD", "HEAD", 1);
268 case UH_HTTP_MSG_POST
:
269 setenv("REQUEST_METHOD", "POST", 1);
274 setenv("REQUEST_URI", req
->url
, 1);
278 setenv("REMOTE_USER", req
->realm
->user
, 1);
280 /* request message headers */
281 foreach_header(i
, req
->headers
)
283 if( ! strcasecmp(req
->headers
[i
], "Accept") )
284 setenv("HTTP_ACCEPT", req
->headers
[i
+1], 1);
286 else if( ! strcasecmp(req
->headers
[i
], "Accept-Charset") )
287 setenv("HTTP_ACCEPT_CHARSET", req
->headers
[i
+1], 1);
289 else if( ! strcasecmp(req
->headers
[i
], "Accept-Encoding") )
290 setenv("HTTP_ACCEPT_ENCODING", req
->headers
[i
+1], 1);
292 else if( ! strcasecmp(req
->headers
[i
], "Accept-Language") )
293 setenv("HTTP_ACCEPT_LANGUAGE", req
->headers
[i
+1], 1);
295 else if( ! strcasecmp(req
->headers
[i
], "Authorization") )
296 setenv("HTTP_AUTHORIZATION", req
->headers
[i
+1], 1);
298 else if( ! strcasecmp(req
->headers
[i
], "Connection") )
299 setenv("HTTP_CONNECTION", req
->headers
[i
+1], 1);
301 else if( ! strcasecmp(req
->headers
[i
], "Cookie") )
302 setenv("HTTP_COOKIE", req
->headers
[i
+1], 1);
304 else if( ! strcasecmp(req
->headers
[i
], "Host") )
305 setenv("HTTP_HOST", req
->headers
[i
+1], 1);
307 else if( ! strcasecmp(req
->headers
[i
], "Referer") )
308 setenv("HTTP_REFERER", req
->headers
[i
+1], 1);
310 else if( ! strcasecmp(req
->headers
[i
], "User-Agent") )
311 setenv("HTTP_USER_AGENT", req
->headers
[i
+1], 1);
313 else if( ! strcasecmp(req
->headers
[i
], "Content-Type") )
314 setenv("CONTENT_TYPE", req
->headers
[i
+1], 1);
316 else if( ! strcasecmp(req
->headers
[i
], "Content-Length") )
317 setenv("CONTENT_LENGTH", req
->headers
[i
+1], 1);
321 /* execute child code ... */
322 if( chdir(pi
->root
) )
326 execl(ip
->path
, ip
->path
, pi
->phys
, NULL
);
328 execl(pi
->phys
, pi
->phys
, NULL
);
330 /* in case it fails ... */
332 "Status: 500 Internal Server Error\r\n\r\n"
333 "Unable to launch the requested CGI program:\n"
335 ip
? ip
->path
: pi
->phys
, strerror(errno
)
343 "Status: 403 Forbidden\r\n\r\n"
344 "Access to this resource is forbidden\n"
354 /* parent; handle I/O relaying */
356 /* close unneeded pipe ends */
361 fd_max
= max(rfd
[0], wfd
[1]) + 1;
363 /* find content length */
364 if( req
->method
== UH_HTTP_MSG_POST
)
366 foreach_header(i
, req
->headers
)
368 if( ! strcasecmp(req
->headers
[i
], "Content-Length") )
370 content_length
= atoi(req
->headers
[i
+1]);
377 memset(hdr
, 0, sizeof(hdr
));
379 /* I/O loop, watch our pipe ends and dispatch child reads/writes from/to socket */
385 FD_SET(rfd
[0], &reader
);
386 FD_SET(wfd
[1], &writer
);
388 timeout
.tv_sec
= (header_sent
< 1) ? cl
->server
->conf
->script_timeout
: 3;
391 ensure_out(rv
= select_intr(fd_max
, &reader
,
392 (content_length
> -1) ? &writer
: NULL
, NULL
, &timeout
));
397 ensure_out(kill(child
, 0));
400 /* wait until we can read or write or both */
403 /* ready to write to cgi program */
404 if( FD_ISSET(wfd
[1], &writer
) )
406 /* there is unread post data waiting */
407 if( content_length
> 0 )
409 /* read it from socket ... */
410 ensure_out(buflen
= uh_tcp_recv(cl
, buf
,
411 min(content_length
, sizeof(buf
))));
415 /* ... and write it to child's stdin */
416 if( write(wfd
[1], buf
, buflen
) < 0 )
419 content_length
-= buflen
;
422 /* unexpected eof! */
425 if( write(wfd
[1], "", 0) < 0 )
432 /* there is no more post data, close pipe to child's stdin */
433 else if( content_length
> -1 )
440 /* ready to read from cgi program */
441 if( FD_ISSET(rfd
[0], &reader
) )
443 /* read data from child ... */
444 if( (buflen
= read(rfd
[0], buf
, sizeof(buf
))) > 0 )
446 /* we have not pushed out headers yet, parse input */
449 /* head buffer not full and no end yet */
450 if( hdrlen
< sizeof(hdr
) )
452 bufoff
= min(buflen
, sizeof(hdr
) - hdrlen
);
453 memcpy(&hdr
[hdrlen
], buf
, bufoff
);
462 /* try to parse header ... */
463 if( (res
= uh_cgi_header_parse(hdr
, hdrlen
, &hdroff
)) != NULL
)
466 ensure_out(uh_http_sendf(cl
, NULL
,
467 "HTTP/%.1f %03d %s\r\n"
468 "Connection: close\r\n",
469 req
->version
, res
->statuscode
,
472 /* add Content-Type if no Location or Content-Type */
473 if( !uh_cgi_header_lookup(res
, "Location") &&
474 !uh_cgi_header_lookup(res
, "Content-Type")
476 ensure_out(uh_http_send(cl
, NULL
,
477 "Content-Type: text/plain\r\n", -1));
480 /* if request was HTTP 1.1 we'll respond chunked */
481 if( (req
->version
> 1.0) &&
482 !uh_cgi_header_lookup(res
, "Transfer-Encoding")
484 ensure_out(uh_http_send(cl
, NULL
,
485 "Transfer-Encoding: chunked\r\n", -1));
488 /* write headers from CGI program */
489 foreach_header(i
, res
->headers
)
491 ensure_out(uh_http_sendf(cl
, NULL
, "%s: %s\r\n",
492 res
->headers
[i
], res
->headers
[i
+1]));
495 /* terminate header */
496 ensure_out(uh_http_send(cl
, NULL
, "\r\n", -1));
498 /* push out remaining head buffer */
499 if( hdroff
< hdrlen
)
500 ensure_out(uh_http_send(cl
, req
, &hdr
[hdroff
], hdrlen
- hdroff
));
503 /* ... failed and head buffer exceeded */
504 else if( hdrlen
>= sizeof(hdr
) )
506 ensure_out(uh_cgi_error_500(cl
, req
,
507 "The CGI program generated an invalid response:\n\n"));
509 ensure_out(uh_http_send(cl
, req
, hdr
, hdrlen
));
512 /* ... failed but free buffer space, try again */
518 /* push out remaining read buffer */
519 if( bufoff
< buflen
)
520 ensure_out(uh_http_send(cl
, req
, &buf
[bufoff
], buflen
- bufoff
));
527 /* headers complete, pass through buffer to socket */
528 ensure_out(uh_http_send(cl
, req
, buf
, buflen
));
531 /* looks like eof from child */
534 /* cgi script did not output useful stuff at all */
537 /* I would do this ...
539 * uh_cgi_error_500(cl, req,
540 * "The CGI program generated an "
541 * "invalid response:\n\n");
543 * ... but in order to stay as compatible as possible,
544 * treat whatever we got as text/plain response and
545 * build the required headers here.
548 ensure_out(uh_http_sendf(cl
, NULL
,
549 "HTTP/%.1f 200 OK\r\n"
550 "Content-Type: text/plain\r\n"
552 req
->version
, (req
->version
> 1.0)
553 ? "Transfer-Encoding: chunked\r\n" : ""
556 ensure_out(uh_http_send(cl
, req
, hdr
, hdrlen
));
559 /* send final chunk if we're in chunked transfer mode */
560 ensure_out(uh_http_send(cl
, req
, "", 0));
566 /* timeout exceeded or interrupted by SIGCHLD */
569 if( (errno
!= EINTR
) && ! header_sent
)
571 ensure_out(uh_http_sendhf(cl
, 504, "Gateway Timeout",
572 "The CGI script took too long to produce "
576 /* send final chunk if we're in chunked transfer mode */
577 ensure_out(uh_http_send(cl
, req
, "", 0));
587 if( !kill(child
, 0) )
589 kill(child
, SIGTERM
);
590 waitpid(child
, NULL
, 0);
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