2 #include "uhttpd-cgi.h"
3 #include "uhttpd-utils.h"
5 static struct http_response
* uh_cgi_header_parse(char *buf
, int len
, int *off
)
12 static struct http_response res
;
15 if( (bufptr
= strfind(buf
, len
, "\r\n\r\n", 4)) != NULL
)
17 *off
= (int)(bufptr
- buf
) + 4;
19 memset(&res
, 0, sizeof(res
));
26 for( pos
= 0; pos
< len
; pos
++ )
28 if( !hdrname
&& (buf
[pos
] == ':') )
32 if( (pos
< len
) && (buf
[pos
] == ' ') )
42 else if( (buf
[pos
] == '\r') || (buf
[pos
] == '\n') )
49 if( (pos
< len
) && (buf
[pos
] == '\n') )
54 if( (hdrcount
+ 1) < array_size(res
.headers
) )
56 if( ! strcasecmp(hdrname
, "Status") )
58 res
.statuscode
= atoi(bufptr
);
60 if( res
.statuscode
< 100 )
63 if( ((bufptr
= strchr(bufptr
, ' ')) != NULL
) && (&bufptr
[1] != 0) )
64 res
.statusmsg
= &bufptr
[1];
68 res
.headers
[hdrcount
++] = hdrname
;
69 res
.headers
[hdrcount
++] = bufptr
;
89 static char * uh_cgi_header_lookup(struct http_response
*res
, const char *hdrname
)
93 foreach_header(i
, res
->headers
)
95 if( ! strcasecmp(res
->headers
[i
], hdrname
) )
96 return res
->headers
[i
+1];
102 static void uh_cgi_error_500(struct client
*cl
, struct http_request
*req
, const char *message
)
104 uh_http_sendf(cl
, NULL
,
105 "HTTP/%.1f 500 Internal Server Error\r\n"
106 "Content-Type: text/plain\r\n%s\r\n",
109 ? "Transfer-Encoding: chunked\r\n" : ""
112 uh_http_send(cl
, req
, message
, -1);
116 void uh_cgi_request(struct client
*cl
, struct http_request
*req
)
118 int i
, hdroff
, bufoff
;
122 int content_length
= 0;
125 int rfd
[2] = { 0, 0 };
126 int wfd
[2] = { 0, 0 };
128 char buf
[UH_LIMIT_MSGHEAD
];
129 char hdr
[UH_LIMIT_MSGHEAD
];
134 struct timeval timeout
;
135 struct http_response
*res
;
136 struct uh_path_info
*pi
;
139 /* spawn pipes for me->child, child->me */
140 if( (pipe(rfd
) < 0) || (pipe(wfd
) < 0) )
142 uh_http_sendhf(cl
, 500, "Internal Server Error",
143 "Failed to create pipe: %s", strerror(errno
));
145 if( rfd
[0] > 0 ) close(rfd
[0]);
146 if( rfd
[1] > 0 ) close(rfd
[1]);
147 if( wfd
[0] > 0 ) close(wfd
[0]);
148 if( wfd
[1] > 0 ) close(wfd
[1]);
153 /* fork off child process */
158 uh_http_sendhf(cl
, 500, "Internal Server Error",
159 "Failed to fork child: %s", strerror(errno
));
168 /* patch stdout and stdin to pipes */
172 if( (pi
= uh_path_lookup(cl
, req
->url
)) != NULL
)
174 /* check for regular, world-executable file */
175 if( (pi
->stat
.st_mode
& S_IFREG
) &&
176 (pi
->stat
.st_mode
& S_IXOTH
)
178 /* build environment */
181 /* common information */
182 setenv("GATEWAY_INTERFACE", "CGI/1.1", 1);
183 setenv("SERVER_SOFTWARE", "uHTTPd", 1);
184 setenv("PATH", "/sbin:/usr/sbin:/bin:/usr/bin", 1);
189 setenv("HTTPS", "on", 1);
193 setenv("SERVER_NAME", sa_straddr(&cl
->servaddr
), 1);
194 setenv("SERVER_ADDR", sa_straddr(&cl
->servaddr
), 1);
195 setenv("SERVER_PORT", sa_strport(&cl
->servaddr
), 1);
196 setenv("REMOTE_HOST", sa_straddr(&cl
->peeraddr
), 1);
197 setenv("REMOTE_ADDR", sa_straddr(&cl
->peeraddr
), 1);
198 setenv("REMOTE_PORT", sa_strport(&cl
->peeraddr
), 1);
200 /* path information */
201 setenv("SCRIPT_NAME", pi
->name
, 1);
202 setenv("SCRIPT_FILENAME", pi
->phys
, 1);
203 setenv("SCRIPT_WORKDIR", pi
->wdir
, 1); /* nonstandard */
204 setenv("DOCUMENT_ROOT", pi
->root
, 1);
205 setenv("QUERY_STRING", pi
->query
? pi
->query
: "", 1);
208 setenv("PATH_INFO", pi
->info
, 1);
212 if( req
->version
> 1.0 )
213 setenv("SERVER_PROTOCOL", "HTTP/1.1", 1);
215 setenv("SERVER_PROTOCOL", "HTTP/1.0", 1);
218 switch( req
->method
)
220 case UH_HTTP_MSG_GET
:
221 setenv("REQUEST_METHOD", "GET", 1);
224 case UH_HTTP_MSG_HEAD
:
225 setenv("REQUEST_METHOD", "HEAD", 1);
228 case UH_HTTP_MSG_POST
:
229 setenv("REQUEST_METHOD", "POST", 1);
234 setenv("REQUEST_URI", req
->url
, 1);
236 /* request message headers */
237 foreach_header(i
, req
->headers
)
239 if( ! strcasecmp(req
->headers
[i
], "Accept") )
240 setenv("HTTP_ACCEPT", req
->headers
[i
+1], 1);
242 else if( ! strcasecmp(req
->headers
[i
], "Accept-Charset") )
243 setenv("HTTP_ACCEPT_CHARSET", req
->headers
[i
+1], 1);
245 else if( ! strcasecmp(req
->headers
[i
], "Accept-Encoding") )
246 setenv("HTTP_ACCEPT_ENCODING", req
->headers
[i
+1], 1);
248 else if( ! strcasecmp(req
->headers
[i
], "Accept-Language") )
249 setenv("HTTP_ACCEPT_LANGUAGE", req
->headers
[i
+1], 1);
251 else if( ! strcasecmp(req
->headers
[i
], "Authorization") )
252 setenv("HTTP_AUTHORIZATION", req
->headers
[i
+1], 1);
254 else if( ! strcasecmp(req
->headers
[i
], "Connection") )
255 setenv("HTTP_CONNECTION", req
->headers
[i
+1], 1);
257 else if( ! strcasecmp(req
->headers
[i
], "Cookie") )
258 setenv("HTTP_COOKIE", req
->headers
[i
+1], 1);
260 else if( ! strcasecmp(req
->headers
[i
], "Host") )
261 setenv("HTTP_HOST", req
->headers
[i
+1], 1);
263 else if( ! strcasecmp(req
->headers
[i
], "Referer") )
264 setenv("HTTP_REFERER", req
->headers
[i
+1], 1);
266 else if( ! strcasecmp(req
->headers
[i
], "User-Agent") )
267 setenv("HTTP_USER_AGENT", req
->headers
[i
+1], 1);
269 else if( ! strcasecmp(req
->headers
[i
], "Content-Type") )
270 setenv("CONTENT_TYPE", req
->headers
[i
+1], 1);
272 else if( ! strcasecmp(req
->headers
[i
], "Content-Length") )
273 setenv("CONTENT_LENGTH", req
->headers
[i
+1], 1);
277 /* execute child code ... */
278 if( chdir(pi
->wdir
) )
281 execl(pi
->phys
, pi
->phys
, NULL
);
283 /* in case it fails ... */
285 "Status: 500 Internal Server Error\r\n\r\n"
286 "Unable to launch the requested CGI program:\n"
288 pi
->phys
, strerror(errno
)
296 "Status: 403 Forbidden\r\n\r\n"
297 "Access to this resource is forbidden\n"
306 "Status: 404 Not Found\r\n\r\n"
307 "Unable to launch the requested CGI program:\n"
308 " No such file or directory\n"
318 /* parent; handle I/O relaying */
320 /* close unneeded pipe ends */
325 fd_max
= max(rfd
[0], wfd
[1]) + 1;
327 /* find content length */
328 if( req
->method
== UH_HTTP_MSG_POST
)
330 foreach_header(i
, req
->headers
)
332 if( ! strcasecmp(req
->headers
[i
], "Content-Length") )
334 content_length
= atoi(req
->headers
[i
+1]);
341 memset(hdr
, 0, sizeof(hdr
));
343 /* I/O loop, watch our pipe ends and dispatch child reads/writes from/to socket */
349 FD_SET(rfd
[0], &reader
);
350 FD_SET(wfd
[1], &writer
);
355 /* wait until we can read or write or both */
356 if( select(fd_max
, &reader
, (content_length
> -1) ? &writer
: NULL
, NULL
, &timeout
) > 0 )
358 /* ready to write to cgi program */
359 if( FD_ISSET(wfd
[1], &writer
) )
361 /* there is unread post data waiting */
362 if( content_length
> 0 )
364 /* read it from socket ... */
365 if( (buflen
= uh_tcp_recv(cl
, buf
, min(content_length
, sizeof(buf
)))) > 0 )
367 /* ... and write it to child's stdin */
368 if( write(wfd
[1], buf
, buflen
) < 0 )
371 content_length
-= buflen
;
374 /* unexpected eof! */
377 if( write(wfd
[1], "", 0) < 0 )
384 /* there is no more post data, close pipe to child's stdin */
392 /* ready to read from cgi program */
393 if( FD_ISSET(rfd
[0], &reader
) )
395 /* read data from child ... */
396 if( (buflen
= read(rfd
[0], buf
, sizeof(buf
))) > 0 )
398 /* we have not pushed out headers yet, parse input */
401 /* head buffer not full and no end yet */
402 if( hdrlen
< sizeof(hdr
) )
404 bufoff
= min(buflen
, sizeof(hdr
) - hdrlen
);
405 memcpy(&hdr
[hdrlen
], buf
, bufoff
);
414 /* try to parse header ... */
415 if( (res
= uh_cgi_header_parse(hdr
, hdrlen
, &hdroff
)) != NULL
)
418 uh_http_sendf(cl
, NULL
, "HTTP/%.1f %03d %s\r\n",
419 req
->version
, res
->statuscode
, res
->statusmsg
);
421 /* add Content-Type if no Location or Content-Type */
422 if( !uh_cgi_header_lookup(res
, "Location") &&
423 !uh_cgi_header_lookup(res
, "Content-Type")
425 uh_http_send(cl
, NULL
,
426 "Content-Type: text/plain\r\n", -1);
429 /* if request was HTTP 1.1 we'll respond chunked */
430 if( (req
->version
> 1.0) &&
431 !uh_cgi_header_lookup(res
, "Transfer-Encoding")
433 uh_http_send(cl
, NULL
,
434 "Transfer-Encoding: chunked\r\n", -1);
437 /* write headers from CGI program */
438 foreach_header(i
, res
->headers
)
440 uh_http_sendf(cl
, NULL
, "%s: %s\r\n",
441 res
->headers
[i
], res
->headers
[i
+1]);
444 /* terminate header */
445 uh_http_send(cl
, NULL
, "\r\n", -1);
447 /* push out remaining head buffer */
448 if( hdroff
< hdrlen
)
449 uh_http_send(cl
, req
, &hdr
[hdroff
], hdrlen
- hdroff
);
452 /* ... failed and head buffer exceeded */
453 else if( hdrlen
>= sizeof(hdr
) )
455 uh_cgi_error_500(cl
, req
,
456 "The CGI program generated an invalid response:\n\n");
458 uh_http_send(cl
, req
, hdr
, hdrlen
);
461 /* ... failed but free buffer space, try again */
467 /* push out remaining read buffer */
468 if( bufoff
< buflen
)
469 uh_http_send(cl
, req
, &buf
[bufoff
], buflen
- bufoff
);
476 /* headers complete, pass through buffer to socket */
477 uh_http_send(cl
, req
, buf
, buflen
);
480 /* looks like eof from child */
483 /* send final chunk if we're in chunked transfer mode */
484 uh_http_send(cl
, req
, "", 0);
490 /* no activity for 3 seconds... looks dead */
493 uh_http_sendhf(cl
, 504, "Gateway Timeout",
494 "The CGI script took too long to produce a response");