b3702c8779759778e5fd3cd8c6b9eb98260dbafa
[project/uhttpd.git] / file.c
1 /*
2 * uhttpd - Tiny single-threaded httpd
3 *
4 * Copyright (C) 2010-2013 Jo-Philipp Wich <xm@subsignal.org>
5 * Copyright (C) 2013 Felix Fietkau <nbd@openwrt.org>
6 *
7 * Permission to use, copy, modify, and/or distribute this software for any
8 * purpose with or without fee is hereby granted, provided that the above
9 * copyright notice and this permission notice appear in all copies.
10 *
11 * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
12 * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
13 * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
14 * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
15 * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
16 * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
17 * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
18 */
19
20 #define _BSD_SOURCE
21 #define _DARWIN_C_SOURCE
22 #define _XOPEN_SOURCE 700
23
24 #include <sys/types.h>
25 #include <sys/dir.h>
26 #include <time.h>
27 #include <strings.h>
28 #include <dirent.h>
29 #include <inttypes.h>
30
31 #include <libubox/blobmsg.h>
32
33 #include "uhttpd.h"
34 #include "mimetypes.h"
35
36 #define MAX(a, b) (((a) > (b)) ? (a) : (b))
37
38 static LIST_HEAD(index_files);
39 static LIST_HEAD(dispatch_handlers);
40 static LIST_HEAD(pending_requests);
41 static int n_requests;
42
43 struct deferred_request {
44 struct list_head list;
45 struct dispatch_handler *d;
46 struct client *cl;
47 struct path_info pi;
48 bool called, path;
49 };
50
51 struct index_file {
52 struct list_head list;
53 const char *name;
54 };
55
56 enum file_hdr {
57 HDR_AUTHORIZATION,
58 HDR_IF_MODIFIED_SINCE,
59 HDR_IF_UNMODIFIED_SINCE,
60 HDR_IF_MATCH,
61 HDR_IF_NONE_MATCH,
62 HDR_IF_RANGE,
63 __HDR_MAX
64 };
65
66 void uh_index_add(const char *filename)
67 {
68 struct index_file *idx;
69
70 idx = calloc(1, sizeof(*idx));
71 idx->name = filename;
72 list_add_tail(&idx->list, &index_files);
73 }
74
75 static char * canonpath(const char *path, char *path_resolved)
76 {
77 const char *path_cpy = path;
78 char *path_res = path_resolved;
79
80 if (conf.no_symlinks)
81 return realpath(path, path_resolved);
82
83 /* normalize */
84 while ((*path_cpy != '\0') && (path_cpy < (path + PATH_MAX - 2))) {
85 if (*path_cpy != '/')
86 goto next;
87
88 /* skip repeating / */
89 if (path_cpy[1] == '/') {
90 path_cpy++;
91 continue;
92 }
93
94 /* /./ or /../ */
95 if (path_cpy[1] == '.') {
96 /* skip /./ */
97 if ((path_cpy[2] == '/') || (path_cpy[2] == '\0')) {
98 path_cpy += 2;
99 continue;
100 }
101
102 /* collapse /x/../ */
103 if ((path_cpy[2] == '.') &&
104 ((path_cpy[3] == '/') || (path_cpy[3] == '\0'))) {
105 while ((path_res > path_resolved) && (*--path_res != '/'));
106
107 path_cpy += 3;
108 continue;
109 }
110 }
111
112 next:
113 *path_res++ = *path_cpy++;
114 }
115
116 /* remove trailing slash if not root / */
117 if ((path_res > (path_resolved+1)) && (path_res[-1] == '/'))
118 path_res--;
119 else if (path_res == path_resolved)
120 *path_res++ = '/';
121
122 *path_res = '\0';
123
124 return path_resolved;
125 }
126
127 /* Returns NULL on error.
128 ** NB: improperly encoded URL should give client 400 [Bad Syntax]; returning
129 ** NULL here causes 404 [Not Found], but that's not too unreasonable. */
130 struct path_info *
131 uh_path_lookup(struct client *cl, const char *url)
132 {
133 static char path_phys[PATH_MAX];
134 static char path_info[PATH_MAX];
135 static char path_query[PATH_MAX];
136 static struct path_info p;
137
138 const char *docroot = conf.docroot;
139 int docroot_len = strlen(docroot);
140 char *pathptr = NULL;
141 bool slash;
142
143 int i = 0;
144 int len;
145 struct stat s;
146 struct index_file *idx;
147
148 /* back out early if url is undefined */
149 if (url == NULL)
150 return NULL;
151
152 memset(&p, 0, sizeof(p));
153 path_phys[0] = 0;
154 path_info[0] = 0;
155
156 strcpy(uh_buf, docroot);
157
158 /* separate query string from url */
159 if ((pathptr = strchr(url, '?')) != NULL) {
160 if (pathptr[1]) {
161 p.query = path_query;
162 snprintf(path_query, sizeof(path_query), "%s",
163 pathptr + 1);
164 }
165
166 /* urldecode component w/o query */
167 if (pathptr > url) {
168 if (uh_urldecode(&uh_buf[docroot_len],
169 sizeof(uh_buf) - docroot_len - 1,
170 url, pathptr - url ) < 0)
171 return NULL;
172 }
173 }
174
175 /* no query string, decode all of url */
176 else if (uh_urldecode(&uh_buf[docroot_len],
177 sizeof(uh_buf) - docroot_len - 1,
178 url, strlen(url) ) < 0)
179 return NULL;
180
181 /* create canon path */
182 len = strlen(uh_buf);
183 slash = len && uh_buf[len - 1] == '/';
184 len = min(len, sizeof(path_phys) - 1);
185
186 for (i = len; i >= 0; i--) {
187 char ch = uh_buf[i];
188 bool exists;
189
190 if (ch != 0 && ch != '/')
191 continue;
192
193 uh_buf[i] = 0;
194 exists = !!canonpath(uh_buf, path_phys);
195 uh_buf[i] = ch;
196
197 if (!exists)
198 continue;
199
200 /* test current path */
201 if (stat(path_phys, &p.stat))
202 continue;
203
204 snprintf(path_info, sizeof(path_info), "%s", uh_buf + i);
205 break;
206 }
207
208 /* check whether found path is within docroot */
209 if (strncmp(path_phys, docroot, docroot_len) != 0 ||
210 (path_phys[docroot_len] != 0 &&
211 path_phys[docroot_len] != '/'))
212 return NULL;
213
214 /* is a regular file */
215 if (p.stat.st_mode & S_IFREG) {
216 p.root = docroot;
217 p.phys = path_phys;
218 p.name = &path_phys[docroot_len];
219 p.info = path_info[0] ? path_info : NULL;
220 return &p;
221 }
222
223 if (!(p.stat.st_mode & S_IFDIR))
224 return NULL;
225
226 if (path_info[0])
227 return NULL;
228
229 pathptr = path_phys + strlen(path_phys);
230
231 /* ensure trailing slash */
232 if (pathptr[-1] != '/') {
233 pathptr[0] = '/';
234 pathptr[1] = 0;
235 pathptr++;
236 }
237
238 /* if requested url resolves to a directory and a trailing slash
239 is missing in the request url, redirect the client to the same
240 url with trailing slash appended */
241 if (!slash) {
242 uh_http_header(cl, 302, "Found");
243 if (!uh_use_chunked(cl))
244 ustream_printf(cl->us, "Content-Length: 0\r\n");
245 ustream_printf(cl->us, "Location: %s%s%s\r\n\r\n",
246 &path_phys[docroot_len],
247 p.query ? "?" : "",
248 p.query ? p.query : "");
249 uh_request_done(cl);
250 p.redirected = 1;
251 return &p;
252 }
253
254 /* try to locate index file */
255 len = path_phys + sizeof(path_phys) - pathptr - 1;
256 list_for_each_entry(idx, &index_files, list) {
257 if (strlen(idx->name) > len)
258 continue;
259
260 strcpy(pathptr, idx->name);
261 if (!stat(path_phys, &s) && (s.st_mode & S_IFREG)) {
262 memcpy(&p.stat, &s, sizeof(p.stat));
263 break;
264 }
265
266 *pathptr = 0;
267 }
268
269 p.root = docroot;
270 p.phys = path_phys;
271 p.name = &path_phys[docroot_len];
272
273 return p.phys ? &p : NULL;
274 }
275
276 static const char * uh_file_mime_lookup(const char *path)
277 {
278 const struct mimetype *m = &uh_mime_types[0];
279 const char *e;
280
281 while (m->extn) {
282 e = &path[strlen(path)-1];
283
284 while (e >= path) {
285 if ((*e == '.' || *e == '/') && !strcasecmp(&e[1], m->extn))
286 return m->mime;
287
288 e--;
289 }
290
291 m++;
292 }
293
294 return "application/octet-stream";
295 }
296
297 static const char * uh_file_mktag(struct stat *s, char *buf, int len)
298 {
299 snprintf(buf, len, "\"%" PRIx64 "-%" PRIx64 "-%" PRIx64 "\"",
300 s->st_ino, s->st_size, (uint64_t)s->st_mtime);
301
302 return buf;
303 }
304
305 static time_t uh_file_date2unix(const char *date)
306 {
307 struct tm t;
308
309 memset(&t, 0, sizeof(t));
310
311 if (strptime(date, "%a, %d %b %Y %H:%M:%S %Z", &t) != NULL)
312 return timegm(&t);
313
314 return 0;
315 }
316
317 static char * uh_file_unix2date(time_t ts, char *buf, int len)
318 {
319 struct tm *t = gmtime(&ts);
320
321 strftime(buf, len, "%a, %d %b %Y %H:%M:%S GMT", t);
322
323 return buf;
324 }
325
326 static char *uh_file_header(struct client *cl, int idx)
327 {
328 if (!cl->dispatch.file.hdr[idx])
329 return NULL;
330
331 return (char *) blobmsg_data(cl->dispatch.file.hdr[idx]);
332 }
333
334 static void uh_file_response_ok_hdrs(struct client *cl, struct stat *s)
335 {
336 char buf[128];
337
338 if (s) {
339 ustream_printf(cl->us, "ETag: %s\r\n", uh_file_mktag(s, buf, sizeof(buf)));
340 ustream_printf(cl->us, "Last-Modified: %s\r\n",
341 uh_file_unix2date(s->st_mtime, buf, sizeof(buf)));
342 }
343 ustream_printf(cl->us, "Date: %s\r\n",
344 uh_file_unix2date(time(NULL), buf, sizeof(buf)));
345 }
346
347 static void uh_file_response_200(struct client *cl, struct stat *s)
348 {
349 uh_http_header(cl, 200, "OK");
350 return uh_file_response_ok_hdrs(cl, s);
351 }
352
353 static void uh_file_response_304(struct client *cl, struct stat *s)
354 {
355 uh_http_header(cl, 304, "Not Modified");
356
357 return uh_file_response_ok_hdrs(cl, s);
358 }
359
360 static void uh_file_response_412(struct client *cl)
361 {
362 uh_http_header(cl, 412, "Precondition Failed");
363 }
364
365 static bool uh_file_if_match(struct client *cl, struct stat *s)
366 {
367 char buf[128];
368 const char *tag = uh_file_mktag(s, buf, sizeof(buf));
369 char *hdr = uh_file_header(cl, HDR_IF_MATCH);
370 char *p;
371 int i;
372
373 if (!hdr)
374 return true;
375
376 p = &hdr[0];
377 for (i = 0; i < strlen(hdr); i++)
378 {
379 if ((hdr[i] == ' ') || (hdr[i] == ',')) {
380 hdr[i++] = 0;
381 p = &hdr[i];
382 } else if (!strcmp(p, "*") || !strcmp(p, tag)) {
383 return true;
384 }
385 }
386
387 uh_file_response_412(cl);
388 return false;
389 }
390
391 static int uh_file_if_modified_since(struct client *cl, struct stat *s)
392 {
393 char *hdr = uh_file_header(cl, HDR_IF_MODIFIED_SINCE);
394
395 if (!hdr)
396 return true;
397
398 if (uh_file_date2unix(hdr) >= s->st_mtime) {
399 uh_file_response_304(cl, s);
400 return false;
401 }
402
403 return true;
404 }
405
406 static int uh_file_if_none_match(struct client *cl, struct stat *s)
407 {
408 char buf[128];
409 const char *tag = uh_file_mktag(s, buf, sizeof(buf));
410 char *hdr = uh_file_header(cl, HDR_IF_NONE_MATCH);
411 char *p;
412 int i;
413
414 if (!hdr)
415 return true;
416
417 p = &hdr[0];
418 for (i = 0; i < strlen(hdr); i++) {
419 if ((hdr[i] == ' ') || (hdr[i] == ',')) {
420 hdr[i++] = 0;
421 p = &hdr[i];
422 } else if (!strcmp(p, "*") || !strcmp(p, tag)) {
423 if ((cl->request.method == UH_HTTP_MSG_GET) ||
424 (cl->request.method == UH_HTTP_MSG_HEAD))
425 uh_file_response_304(cl, s);
426 else
427 uh_file_response_412(cl);
428
429 return false;
430 }
431 }
432
433 return true;
434 }
435
436 static int uh_file_if_range(struct client *cl, struct stat *s)
437 {
438 char *hdr = uh_file_header(cl, HDR_IF_RANGE);
439
440 if (hdr) {
441 uh_file_response_412(cl);
442 return false;
443 }
444
445 return true;
446 }
447
448 static int uh_file_if_unmodified_since(struct client *cl, struct stat *s)
449 {
450 char *hdr = uh_file_header(cl, HDR_IF_UNMODIFIED_SINCE);
451
452 if (hdr && uh_file_date2unix(hdr) <= s->st_mtime) {
453 uh_file_response_412(cl);
454 return false;
455 }
456
457 return true;
458 }
459
460 static int dirent_cmp(const struct dirent **a, const struct dirent **b)
461 {
462 bool dir_a = !!((*a)->d_type & DT_DIR);
463 bool dir_b = !!((*b)->d_type & DT_DIR);
464
465 /* directories first */
466 if (dir_a != dir_b)
467 return dir_b - dir_a;
468
469 return alphasort(a, b);
470 }
471
472 static void list_entries(struct client *cl, struct dirent **files, int count,
473 const char *path, char *local_path)
474 {
475 const char *suffix = "/";
476 const char *type = "directory";
477 unsigned int mode = S_IXOTH;
478 struct stat s;
479 char *file;
480 char buf[128];
481 int i;
482
483 file = local_path + strlen(local_path);
484 for (i = 0; i < count; i++) {
485 const char *name = files[i]->d_name;
486 bool dir = !!(files[i]->d_type & DT_DIR);
487
488 if (name[0] == '.' && name[1] == 0)
489 goto next;
490
491 sprintf(file, "%s", name);
492 if (stat(local_path, &s))
493 goto next;
494
495 if (!dir) {
496 suffix = "";
497 mode = S_IROTH;
498 type = uh_file_mime_lookup(local_path);
499 }
500
501 if (!(s.st_mode & mode))
502 goto next;
503
504 uh_chunk_printf(cl,
505 "<li><strong><a href='%s%s%s'>%s</a>%s"
506 "</strong><br /><small>modified: %s"
507 "<br />%s - %.02f kbyte<br />"
508 "<br /></small></li>",
509 path, name, suffix,
510 name, suffix,
511 uh_file_unix2date(s.st_mtime, buf, sizeof(buf)),
512 type, s.st_size / 1024.0);
513
514 *file = 0;
515 next:
516 free(files[i]);
517 }
518 }
519
520 static void uh_file_dirlist(struct client *cl, struct path_info *pi)
521 {
522 struct dirent **files = NULL;
523 int count = 0;
524
525 uh_file_response_200(cl, NULL);
526 ustream_printf(cl->us, "Content-Type: text/html\r\n\r\n");
527
528 uh_chunk_printf(cl,
529 "<html><head><title>Index of %s</title></head>"
530 "<body><h1>Index of %s</h1><hr /><ol>",
531 pi->name, pi->name);
532
533 count = scandir(pi->phys, &files, NULL, dirent_cmp);
534 if (count > 0) {
535 strcpy(uh_buf, pi->phys);
536 list_entries(cl, files, count, pi->name, uh_buf);
537 }
538 free(files);
539
540 uh_chunk_printf(cl, "</ol><hr /></body></html>");
541 uh_request_done(cl);
542 }
543
544 static void file_write_cb(struct client *cl)
545 {
546 int fd = cl->dispatch.file.fd;
547 int r;
548
549 while (cl->us->w.data_bytes < 256) {
550 r = read(fd, uh_buf, sizeof(uh_buf));
551 if (r < 0) {
552 if (errno == EINTR)
553 continue;
554 }
555
556 if (!r) {
557 uh_request_done(cl);
558 return;
559 }
560
561 uh_chunk_write(cl, uh_buf, r);
562 }
563 }
564
565 static void uh_file_free(struct client *cl)
566 {
567 close(cl->dispatch.file.fd);
568 }
569
570 static void uh_file_data(struct client *cl, struct path_info *pi, int fd)
571 {
572 /* test preconditions */
573 if (!cl->dispatch.no_cache &&
574 (!uh_file_if_modified_since(cl, &pi->stat) ||
575 !uh_file_if_match(cl, &pi->stat) ||
576 !uh_file_if_range(cl, &pi->stat) ||
577 !uh_file_if_unmodified_since(cl, &pi->stat) ||
578 !uh_file_if_none_match(cl, &pi->stat))) {
579 ustream_printf(cl->us, "\r\n");
580 uh_request_done(cl);
581 close(fd);
582 return;
583 }
584
585 /* write status */
586 uh_file_response_200(cl, &pi->stat);
587
588 ustream_printf(cl->us, "Content-Type: %s\r\n",
589 uh_file_mime_lookup(pi->name));
590
591 ustream_printf(cl->us, "Content-Length: %" PRIu64 "\r\n\r\n",
592 pi->stat.st_size);
593
594
595 /* send body */
596 if (cl->request.method == UH_HTTP_MSG_HEAD) {
597 uh_request_done(cl);
598 close(fd);
599 return;
600 }
601
602 cl->dispatch.file.fd = fd;
603 cl->dispatch.write_cb = file_write_cb;
604 cl->dispatch.free = uh_file_free;
605 cl->dispatch.close_fds = uh_file_free;
606 file_write_cb(cl);
607 }
608
609 static bool __handle_file_request(struct client *cl, char *url);
610
611 static void uh_file_request(struct client *cl, const char *url,
612 struct path_info *pi, struct blob_attr **tb)
613 {
614 int fd;
615 struct http_request *req = &cl->request;
616 char *error_handler;
617
618 if (!(pi->stat.st_mode & S_IROTH))
619 goto error;
620
621 if (pi->stat.st_mode & S_IFREG) {
622 fd = open(pi->phys, O_RDONLY);
623 if (fd < 0)
624 goto error;
625
626 req->disable_chunked = true;
627 cl->dispatch.file.hdr = tb;
628 uh_file_data(cl, pi, fd);
629 cl->dispatch.file.hdr = NULL;
630 return;
631 }
632
633 if ((pi->stat.st_mode & S_IFDIR)) {
634 if (conf.no_dirlists)
635 goto error;
636
637 uh_file_dirlist(cl, pi);
638 return;
639 }
640
641 error:
642 /* check for a previously set 403 redirect status to prevent infinite
643 recursion when the error page itself lacks sufficient permissions */
644 if (conf.error_handler && req->redirect_status != 403) {
645 req->redirect_status = 403;
646 error_handler = alloca(strlen(conf.error_handler) + 1);
647 strcpy(error_handler, conf.error_handler);
648 if (__handle_file_request(cl, error_handler))
649 return;
650 }
651
652 uh_client_error(cl, 403, "Forbidden",
653 "You don't have permission to access %s on this server.",
654 url);
655 }
656
657 void uh_dispatch_add(struct dispatch_handler *d)
658 {
659 list_add_tail(&d->list, &dispatch_handlers);
660 }
661
662 static struct dispatch_handler *
663 dispatch_find(const char *url, struct path_info *pi)
664 {
665 struct dispatch_handler *d;
666
667 list_for_each_entry(d, &dispatch_handlers, list) {
668 if (pi) {
669 if (d->check_url)
670 continue;
671
672 if (d->check_path(pi, url))
673 return d;
674 } else {
675 if (d->check_path)
676 continue;
677
678 if (d->check_url(url))
679 return d;
680 }
681 }
682
683 return NULL;
684 }
685
686 static void
687 uh_invoke_script(struct client *cl, struct dispatch_handler *d, struct path_info *pi)
688 {
689 char *url = blobmsg_data(blob_data(cl->hdr.head));
690
691 n_requests++;
692 d->handle_request(cl, url, pi);
693 }
694
695 static void uh_complete_request(struct client *cl)
696 {
697 struct deferred_request *dr;
698
699 n_requests--;
700
701 while (!list_empty(&pending_requests)) {
702 if (n_requests >= conf.max_script_requests)
703 return;
704
705 dr = list_first_entry(&pending_requests, struct deferred_request, list);
706 list_del(&dr->list);
707
708 cl = dr->cl;
709 dr->called = true;
710 cl->dispatch.data_blocked = false;
711 uh_invoke_script(cl, dr->d, dr->path ? &dr->pi : NULL);
712 client_poll_post_data(cl);
713 }
714 }
715
716
717 static void
718 uh_free_pending_request(struct client *cl)
719 {
720 struct deferred_request *dr = cl->dispatch.req_data;
721
722 if (dr->called)
723 uh_complete_request(cl);
724 else
725 list_del(&dr->list);
726 free(dr);
727 }
728
729 static int field_len(const char *ptr)
730 {
731 if (!ptr)
732 return 0;
733
734 return strlen(ptr) + 1;
735 }
736
737 #define path_info_fields \
738 _field(root) \
739 _field(phys) \
740 _field(name) \
741 _field(info) \
742 _field(query)
743
744 static void
745 uh_defer_script(struct client *cl, struct dispatch_handler *d, struct path_info *pi)
746 {
747 struct deferred_request *dr;
748 char *_root, *_phys, *_name, *_info, *_query;
749
750 cl->dispatch.req_free = uh_free_pending_request;
751
752 if (pi) {
753 /* allocate enough memory to duplicate all path_info strings in one block */
754 #undef _field
755 #define _field(_name) &_##_name, field_len(pi->_name),
756 dr = calloc_a(sizeof(*dr), path_info_fields NULL);
757
758 memcpy(&dr->pi, pi, sizeof(*pi));
759 dr->path = true;
760
761 /* copy all path_info strings */
762 #undef _field
763 #define _field(_name) if (pi->_name) dr->pi._name = strcpy(_##_name, pi->_name);
764 path_info_fields
765 } else {
766 dr = calloc(1, sizeof(*dr));
767 }
768
769 cl->dispatch.req_data = dr;
770 cl->dispatch.data_blocked = true;
771 dr->cl = cl;
772 dr->d = d;
773 list_add(&dr->list, &pending_requests);
774 }
775
776 static void
777 uh_invoke_handler(struct client *cl, struct dispatch_handler *d, char *url, struct path_info *pi)
778 {
779 if (!d->script)
780 return d->handle_request(cl, url, pi);
781
782 if (n_requests >= conf.max_script_requests)
783 return uh_defer_script(cl, d, pi);
784
785 cl->dispatch.req_free = uh_complete_request;
786 uh_invoke_script(cl, d, pi);
787 }
788
789 static bool __handle_file_request(struct client *cl, char *url)
790 {
791 static const struct blobmsg_policy hdr_policy[__HDR_MAX] = {
792 [HDR_AUTHORIZATION] = { "authorization", BLOBMSG_TYPE_STRING },
793 [HDR_IF_MODIFIED_SINCE] = { "if-modified-since", BLOBMSG_TYPE_STRING },
794 [HDR_IF_UNMODIFIED_SINCE] = { "if-unmodified-since", BLOBMSG_TYPE_STRING },
795 [HDR_IF_MATCH] = { "if-match", BLOBMSG_TYPE_STRING },
796 [HDR_IF_NONE_MATCH] = { "if-none-match", BLOBMSG_TYPE_STRING },
797 [HDR_IF_RANGE] = { "if-range", BLOBMSG_TYPE_STRING },
798 };
799 struct dispatch_handler *d;
800 struct blob_attr *tb[__HDR_MAX];
801 struct path_info *pi;
802 char *user, *pass, *auth;
803
804 pi = uh_path_lookup(cl, url);
805 if (!pi)
806 return false;
807
808 if (pi->redirected)
809 return true;
810
811 blobmsg_parse(hdr_policy, __HDR_MAX, tb, blob_data(cl->hdr.head), blob_len(cl->hdr.head));
812
813 auth = tb[HDR_AUTHORIZATION] ? blobmsg_data(tb[HDR_AUTHORIZATION]) : NULL;
814
815 if (!uh_auth_check(cl, pi->name, auth, &user, &pass))
816 return true;
817
818 if (user && pass) {
819 blobmsg_add_string(&cl->hdr, "http-auth-user", user);
820 blobmsg_add_string(&cl->hdr, "http-auth-pass", pass);
821 }
822
823 d = dispatch_find(url, pi);
824 if (d)
825 uh_invoke_handler(cl, d, url, pi);
826 else
827 uh_file_request(cl, url, pi, tb);
828
829 return true;
830 }
831
832 static char *uh_handle_alias(char *old_url)
833 {
834 struct alias *alias;
835 static char *new_url;
836 static int url_len;
837
838 if (!list_empty(&conf.cgi_alias)) list_for_each_entry(alias, &conf.cgi_alias, list) {
839 int old_len;
840 int new_len;
841 int path_len = 0;
842
843 if (!uh_path_match(alias->alias, old_url))
844 continue;
845
846 if (alias->path)
847 path_len = strlen(alias->path);
848
849 old_len = strlen(old_url) + 1;
850 new_len = old_len + MAX(conf.cgi_prefix_len, path_len);
851
852 if (new_len > url_len) {
853 new_url = realloc(new_url, new_len);
854 url_len = new_len;
855 }
856
857 *new_url = '\0';
858
859 if (alias->path)
860 strcpy(new_url, alias->path);
861 else if (conf.cgi_prefix)
862 strcpy(new_url, conf.cgi_prefix);
863 strcat(new_url, old_url);
864
865 return new_url;
866 }
867 return old_url;
868 }
869
870 void uh_handle_request(struct client *cl)
871 {
872 struct http_request *req = &cl->request;
873 struct dispatch_handler *d;
874 char *url = blobmsg_data(blob_data(cl->hdr.head));
875 char *error_handler;
876
877 blob_buf_init(&cl->hdr_response, 0);
878 url = uh_handle_alias(url);
879
880 uh_handler_run(cl, &url, false);
881 if (!url)
882 return;
883
884 req->redirect_status = 200;
885 d = dispatch_find(url, NULL);
886 if (d)
887 return uh_invoke_handler(cl, d, url, NULL);
888
889 if (__handle_file_request(cl, url))
890 return;
891
892 if (uh_handler_run(cl, &url, true)) {
893 if (!url)
894 return;
895
896 uh_handler_run(cl, &url, false);
897 if (__handle_file_request(cl, url))
898 return;
899 }
900
901 req->redirect_status = 404;
902 if (conf.error_handler) {
903 error_handler = alloca(strlen(conf.error_handler) + 1);
904 strcpy(error_handler, conf.error_handler);
905 if (__handle_file_request(cl, error_handler))
906 return;
907 }
908
909 uh_client_error(cl, 404, "Not Found", "The requested URL %s was not found on this server.", url);
910 }