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[package] uhttpd: remove some dead code
[openwrt/svn-archive/archive.git] / package / uhttpd / src / uhttpd-cgi.c
1 /*
2 * uhttpd - Tiny single-threaded httpd - CGI handler
3 *
4 * Copyright (C) 2010-2012 Jo-Philipp Wich <xm@subsignal.org>
5 *
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
9 *
10 * http://www.apache.org/licenses/LICENSE-2.0
11 *
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.
17 */
18
19 #include "uhttpd.h"
20 #include "uhttpd-utils.h"
21 #include "uhttpd-cgi.h"
22
23
24 static bool
25 uh_cgi_header_parse(struct http_response *res, char *buf, int len, int *off)
26 {
27 char *bufptr = NULL;
28 char *hdrname = NULL;
29 int hdrcount = 0;
30 int pos = 0;
31
32 if (((bufptr = strfind(buf, len, "\r\n\r\n", 4)) != NULL) ||
33 ((bufptr = strfind(buf, len, "\n\n", 2)) != NULL))
34 {
35 *off = (int)(bufptr - buf) + ((bufptr[0] == '\r') ? 4 : 2);
36
37 memset(res, 0, sizeof(*res));
38
39 res->statuscode = 200;
40 res->statusmsg = "OK";
41
42 bufptr = &buf[0];
43
44 for (pos = 0; pos < *off; pos++)
45 {
46 if (!hdrname && (buf[pos] == ':'))
47 {
48 buf[pos++] = 0;
49
50 if ((pos < len) && (buf[pos] == ' '))
51 pos++;
52
53 if (pos < len)
54 {
55 hdrname = bufptr;
56 bufptr = &buf[pos];
57 }
58 }
59
60 else if ((buf[pos] == '\r') || (buf[pos] == '\n'))
61 {
62 if (! hdrname)
63 break;
64
65 buf[pos++] = 0;
66
67 if ((pos < len) && (buf[pos] == '\n'))
68 pos++;
69
70 if (pos <= len)
71 {
72 if ((hdrcount+1) < array_size(res->headers))
73 {
74 if (!strcasecmp(hdrname, "Status"))
75 {
76 res->statuscode = atoi(bufptr);
77
78 if (res->statuscode < 100)
79 res->statuscode = 200;
80
81 if (((bufptr = strchr(bufptr, ' ')) != NULL) &&
82 (&bufptr[1] != 0))
83 {
84 res->statusmsg = &bufptr[1];
85 }
86
87 D("CGI: HTTP/1.x %03d %s\n",
88 res->statuscode, res->statusmsg);
89 }
90 else
91 {
92 D("CGI: HTTP: %s: %s\n", hdrname, bufptr);
93
94 res->headers[hdrcount++] = hdrname;
95 res->headers[hdrcount++] = bufptr;
96 }
97
98 bufptr = &buf[pos];
99 hdrname = NULL;
100 }
101 else
102 {
103 return false;
104 }
105 }
106 }
107 }
108
109 return true;
110 }
111
112 return false;
113 }
114
115 static char * uh_cgi_header_lookup(struct http_response *res,
116 const char *hdrname)
117 {
118 int i;
119
120 foreach_header(i, res->headers)
121 {
122 if (!strcasecmp(res->headers[i], hdrname))
123 return res->headers[i+1];
124 }
125
126 return NULL;
127 }
128
129 static void uh_cgi_shutdown(struct uh_cgi_state *state)
130 {
131 close(state->rfd);
132 close(state->wfd);
133 free(state);
134 }
135
136 static bool uh_cgi_socket_cb(struct client *cl)
137 {
138 int i, len, hdroff;
139 char buf[UH_LIMIT_MSGHEAD];
140
141 struct uh_cgi_state *state = (struct uh_cgi_state *)cl->priv;
142 struct http_response *res = &state->cl->response;
143 struct http_request *req = &state->cl->request;
144
145 /* there is unread post data waiting */
146 while (state->content_length > 0)
147 {
148 /* remaining data in http head buffer ... */
149 if (state->cl->httpbuf.len > 0)
150 {
151 len = min(state->content_length, state->cl->httpbuf.len);
152
153 D("CGI: Child(%d) feed %d HTTP buffer bytes\n",
154 state->cl->proc.pid, len);
155
156 memcpy(buf, state->cl->httpbuf.ptr, len);
157
158 state->cl->httpbuf.len -= len;
159 state->cl->httpbuf.ptr +=len;
160 }
161
162 /* read it from socket ... */
163 else
164 {
165 len = uh_tcp_recv(state->cl, buf,
166 min(state->content_length, sizeof(buf)));
167
168 if ((len < 0) && ((errno == EAGAIN) || (errno == EWOULDBLOCK)))
169 break;
170
171 D("CGI: Child(%d) feed %d/%d TCP socket bytes\n",
172 state->cl->proc.pid, len,
173 min(state->content_length, sizeof(buf)));
174 }
175
176 if (len)
177 state->content_length -= len;
178 else
179 state->content_length = 0;
180
181 /* ... write to CGI process */
182 len = uh_raw_send(state->wfd, buf, len,
183 cl->server->conf->script_timeout);
184
185 /* explicit EOF notification for the child */
186 if (state->content_length <= 0)
187 close(state->wfd);
188 }
189
190 /* try to read data from child */
191 while ((len = uh_raw_recv(state->rfd, buf, sizeof(buf), -1)) > 0)
192 {
193 /* we have not pushed out headers yet, parse input */
194 if (!state->header_sent)
195 {
196 /* try to parse header ... */
197 memcpy(state->httpbuf, buf, len);
198
199 if (uh_cgi_header_parse(res, state->httpbuf, len, &hdroff))
200 {
201 /* write status */
202 ensure_out(uh_http_sendf(state->cl, NULL,
203 "HTTP/%.1f %03d %s\r\n"
204 "Connection: close\r\n",
205 req->version, res->statuscode, res->statusmsg));
206
207 /* add Content-Type if no Location or Content-Type */
208 if (!uh_cgi_header_lookup(res, "Location") &&
209 !uh_cgi_header_lookup(res, "Content-Type"))
210 {
211 ensure_out(uh_http_send(state->cl, NULL,
212 "Content-Type: text/plain\r\n", -1));
213 }
214
215 /* if request was HTTP 1.1 we'll respond chunked */
216 if ((req->version > 1.0) &&
217 !uh_cgi_header_lookup(res, "Transfer-Encoding"))
218 {
219 ensure_out(uh_http_send(state->cl, NULL,
220 "Transfer-Encoding: chunked\r\n", -1));
221 }
222
223 /* write headers from CGI program */
224 foreach_header(i, res->headers)
225 {
226 ensure_out(uh_http_sendf(state->cl, NULL, "%s: %s\r\n",
227 res->headers[i], res->headers[i+1]));
228 }
229
230 /* terminate header */
231 ensure_out(uh_http_send(state->cl, NULL, "\r\n", -1));
232
233 state->header_sent = true;
234
235 /* push out remaining head buffer */
236 if (hdroff < len)
237 {
238 D("CGI: Child(%d) relaying %d rest bytes\n",
239 state->cl->proc.pid, len - hdroff);
240
241 ensure_out(uh_http_send(state->cl, req,
242 &buf[hdroff], len - hdroff));
243 }
244 }
245
246 /* ... failed and head buffer exceeded */
247 else
248 {
249 /* I would do this ...
250 *
251 * uh_cgi_error_500(cl, req,
252 * "The CGI program generated an "
253 * "invalid response:\n\n");
254 *
255 * ... but in order to stay as compatible as possible,
256 * treat whatever we got as text/plain response and
257 * build the required headers here.
258 */
259
260 ensure_out(uh_http_sendf(state->cl, NULL,
261 "HTTP/%.1f 200 OK\r\n"
262 "Content-Type: text/plain\r\n"
263 "%s\r\n",
264 req->version, (req->version > 1.0)
265 ? "Transfer-Encoding: chunked\r\n" : ""
266 ));
267
268 state->header_sent = true;
269
270 D("CGI: Child(%d) relaying %d invalid bytes\n",
271 state->cl->proc.pid, len);
272
273 ensure_out(uh_http_send(state->cl, req, buf, len));
274 }
275 }
276 else
277 {
278 /* headers complete, pass through buffer to socket */
279 D("CGI: Child(%d) relaying %d normal bytes\n",
280 state->cl->proc.pid, len);
281
282 ensure_out(uh_http_send(state->cl, req, buf, len));
283 }
284 }
285
286 /* got EOF or read error from child */
287 if ((len == 0) ||
288 ((errno != EAGAIN) && (errno != EWOULDBLOCK) && (len == -1)))
289 {
290 D("CGI: Child(%d) presumed dead [%s]\n",
291 state->cl->proc.pid, strerror(errno));
292
293 goto out;
294 }
295
296 return true;
297
298 out:
299 if (!state->header_sent)
300 {
301 if (state->cl->timeout.pending)
302 uh_http_sendhf(state->cl, 502, "Bad Gateway",
303 "The CGI process did not produce any response\n");
304 else
305 uh_http_sendhf(state->cl, 504, "Gateway Timeout",
306 "The CGI process took too long to produce a "
307 "response\n");
308 }
309 else
310 {
311 uh_http_send(state->cl, req, "", 0);
312 }
313
314 uh_cgi_shutdown(state);
315 return false;
316 }
317
318 bool uh_cgi_request(struct client *cl, struct path_info *pi,
319 struct interpreter *ip)
320 {
321 int i;
322
323 int rfd[2] = { 0, 0 };
324 int wfd[2] = { 0, 0 };
325
326 pid_t child;
327
328 struct uh_cgi_state *state;
329 struct http_request *req = &cl->request;
330
331 /* allocate state */
332 if (!(state = malloc(sizeof(*state))))
333 {
334 uh_http_sendhf(cl, 500, "Internal Server Error", "Out of memory");
335 return false;
336 }
337
338 /* spawn pipes for me->child, child->me */
339 if ((pipe(rfd) < 0) || (pipe(wfd) < 0))
340 {
341 if (rfd[0] > 0) close(rfd[0]);
342 if (rfd[1] > 0) close(rfd[1]);
343 if (wfd[0] > 0) close(wfd[0]);
344 if (wfd[1] > 0) close(wfd[1]);
345
346 uh_http_sendhf(cl, 500, "Internal Server Error",
347 "Failed to create pipe: %s\n", strerror(errno));
348
349 return false;
350 }
351
352 /* fork off child process */
353 switch ((child = fork()))
354 {
355 /* oops */
356 case -1:
357 uh_http_sendhf(cl, 500, "Internal Server Error",
358 "Failed to fork child: %s\n", strerror(errno));
359
360 return false;
361
362 /* exec child */
363 case 0:
364 #ifdef DEBUG
365 sleep(atoi(getenv("UHTTPD_SLEEP_ON_FORK") ?: "0"));
366 #endif
367
368 /* close loose pipe ends */
369 close(rfd[0]);
370 close(wfd[1]);
371
372 /* patch stdout and stdin to pipes */
373 dup2(rfd[1], 1);
374 dup2(wfd[0], 0);
375
376 /* avoid leaking our pipe into child-child processes */
377 fd_cloexec(rfd[1]);
378 fd_cloexec(wfd[0]);
379
380 /* check for regular, world-executable file _or_ interpreter */
381 if (((pi->stat.st_mode & S_IFREG) &&
382 (pi->stat.st_mode & S_IXOTH)) || (ip != NULL))
383 {
384 /* build environment */
385 clearenv();
386
387 /* common information */
388 setenv("GATEWAY_INTERFACE", "CGI/1.1", 1);
389 setenv("SERVER_SOFTWARE", "uHTTPd", 1);
390 setenv("PATH", "/sbin:/usr/sbin:/bin:/usr/bin", 1);
391
392 #ifdef HAVE_TLS
393 /* https? */
394 if (cl->tls)
395 setenv("HTTPS", "on", 1);
396 #endif
397
398 /* addresses */
399 setenv("SERVER_NAME", sa_straddr(&cl->servaddr), 1);
400 setenv("SERVER_ADDR", sa_straddr(&cl->servaddr), 1);
401 setenv("SERVER_PORT", sa_strport(&cl->servaddr), 1);
402 setenv("REMOTE_HOST", sa_straddr(&cl->peeraddr), 1);
403 setenv("REMOTE_ADDR", sa_straddr(&cl->peeraddr), 1);
404 setenv("REMOTE_PORT", sa_strport(&cl->peeraddr), 1);
405
406 /* path information */
407 setenv("SCRIPT_NAME", pi->name, 1);
408 setenv("SCRIPT_FILENAME", pi->phys, 1);
409 setenv("DOCUMENT_ROOT", pi->root, 1);
410 setenv("QUERY_STRING", pi->query ? pi->query : "", 1);
411
412 if (pi->info)
413 setenv("PATH_INFO", pi->info, 1);
414
415 /* REDIRECT_STATUS, php-cgi wants it */
416 switch (req->redirect_status)
417 {
418 case 404:
419 setenv("REDIRECT_STATUS", "404", 1);
420 break;
421
422 default:
423 setenv("REDIRECT_STATUS", "200", 1);
424 break;
425 }
426
427 /* http version */
428 if (req->version > 1.0)
429 setenv("SERVER_PROTOCOL", "HTTP/1.1", 1);
430 else
431 setenv("SERVER_PROTOCOL", "HTTP/1.0", 1);
432
433 /* request method */
434 switch (req->method)
435 {
436 case UH_HTTP_MSG_GET:
437 setenv("REQUEST_METHOD", "GET", 1);
438 break;
439
440 case UH_HTTP_MSG_HEAD:
441 setenv("REQUEST_METHOD", "HEAD", 1);
442 break;
443
444 case UH_HTTP_MSG_POST:
445 setenv("REQUEST_METHOD", "POST", 1);
446 break;
447 }
448
449 /* request url */
450 setenv("REQUEST_URI", req->url, 1);
451
452 /* remote user */
453 if (req->realm)
454 setenv("REMOTE_USER", req->realm->user, 1);
455
456 /* request message headers */
457 foreach_header(i, req->headers)
458 {
459 if (!strcasecmp(req->headers[i], "Accept"))
460 setenv("HTTP_ACCEPT", req->headers[i+1], 1);
461
462 else if (!strcasecmp(req->headers[i], "Accept-Charset"))
463 setenv("HTTP_ACCEPT_CHARSET", req->headers[i+1], 1);
464
465 else if (!strcasecmp(req->headers[i], "Accept-Encoding"))
466 setenv("HTTP_ACCEPT_ENCODING", req->headers[i+1], 1);
467
468 else if (!strcasecmp(req->headers[i], "Accept-Language"))
469 setenv("HTTP_ACCEPT_LANGUAGE", req->headers[i+1], 1);
470
471 else if (!strcasecmp(req->headers[i], "Authorization"))
472 setenv("HTTP_AUTHORIZATION", req->headers[i+1], 1);
473
474 else if (!strcasecmp(req->headers[i], "Connection"))
475 setenv("HTTP_CONNECTION", req->headers[i+1], 1);
476
477 else if (!strcasecmp(req->headers[i], "Cookie"))
478 setenv("HTTP_COOKIE", req->headers[i+1], 1);
479
480 else if (!strcasecmp(req->headers[i], "Host"))
481 setenv("HTTP_HOST", req->headers[i+1], 1);
482
483 else if (!strcasecmp(req->headers[i], "Referer"))
484 setenv("HTTP_REFERER", req->headers[i+1], 1);
485
486 else if (!strcasecmp(req->headers[i], "User-Agent"))
487 setenv("HTTP_USER_AGENT", req->headers[i+1], 1);
488
489 else if (!strcasecmp(req->headers[i], "Content-Type"))
490 setenv("CONTENT_TYPE", req->headers[i+1], 1);
491
492 else if (!strcasecmp(req->headers[i], "Content-Length"))
493 setenv("CONTENT_LENGTH", req->headers[i+1], 1);
494 }
495
496
497 /* execute child code ... */
498 if (chdir(pi->root))
499 perror("chdir()");
500
501 if (ip != NULL)
502 execl(ip->path, ip->path, pi->phys, NULL);
503 else
504 execl(pi->phys, pi->phys, NULL);
505
506 /* in case it fails ... */
507 printf("Status: 500 Internal Server Error\r\n\r\n"
508 "Unable to launch the requested CGI program:\n"
509 " %s: %s\n", ip ? ip->path : pi->phys, strerror(errno));
510 }
511
512 /* 403 */
513 else
514 {
515 printf("Status: 403 Forbidden\r\n\r\n"
516 "Access to this resource is forbidden\n");
517 }
518
519 close(wfd[0]);
520 close(rfd[1]);
521 exit(0);
522
523 break;
524
525 /* parent; handle I/O relaying */
526 default:
527 memset(state, 0, sizeof(*state));
528
529 state->cl = cl;
530 state->cl->proc.pid = child;
531
532 /* close unneeded pipe ends */
533 close(rfd[1]);
534 close(wfd[0]);
535
536 D("CGI: Child(%d) created: rfd(%d) wfd(%d)\n", child, rfd[0], wfd[1]);
537
538 state->content_length = cl->httpbuf.len;
539
540 /* find content length */
541 if (req->method == UH_HTTP_MSG_POST)
542 {
543 foreach_header(i, req->headers)
544 {
545 if (!strcasecmp(req->headers[i], "Content-Length"))
546 {
547 state->content_length = atoi(req->headers[i+1]);
548 break;
549 }
550 }
551 }
552
553 state->rfd = rfd[0];
554 fd_nonblock(state->rfd);
555
556 state->wfd = wfd[1];
557 fd_nonblock(state->wfd);
558
559 cl->cb = uh_cgi_socket_cb;
560 cl->priv = state;
561
562 break;
563 }
564
565 return true;
566 }
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