2 * uhttpd - Tiny single-threaded httpd
4 * Copyright (C) 2010-2012 Jo-Philipp Wich <xm@subsignal.org>
5 * Copyright (C) 2012 Felix Fietkau <nbd@openwrt.org>
7 * Licensed under the Apache License, Version 2.0 (the "License");
8 * you may not use this file except in compliance with the License.
9 * You may obtain a copy of the License at
11 * http://www.apache.org/licenses/LICENSE-2.0
13 * Unless required by applicable law or agreed to in writing, software
14 * distributed under the License is distributed on an "AS IS" BASIS,
15 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
16 * See the License for the specific language governing permissions and
17 * limitations under the License.
21 #define _XOPEN_SOURCE 700
23 #include <sys/types.h>
28 #include <libubox/blobmsg.h>
31 #include "mimetypes.h"
33 static char _tag
[128];
34 static LIST_HEAD(index_files
);
35 static LIST_HEAD(dispatch_handlers
);
38 struct list_head list
;
44 HDR_IF_MODIFIED_SINCE
,
45 HDR_IF_UNMODIFIED_SINCE
,
52 void uh_index_add(const char *filename
)
54 struct index_file
*idx
;
56 idx
= calloc(1, sizeof(*idx
));
58 list_add_tail(&idx
->list
, &index_files
);
61 static char * canonpath(const char *path
, char *path_resolved
)
63 const char *path_cpy
= path
;
64 char *path_res
= path_resolved
;
67 return realpath(path
, path_resolved
);
70 while ((*path_cpy
!= '\0') && (path_cpy
< (path
+ PATH_MAX
- 2))) {
74 /* skip repeating / */
75 if (path_cpy
[1] == '/') {
81 if (path_cpy
[1] == '.') {
83 if ((path_cpy
[2] == '/') || (path_cpy
[2] == '\0')) {
89 if ((path_cpy
[2] == '.') &&
90 ((path_cpy
[3] == '/') || (path_cpy
[3] == '\0'))) {
91 while ((path_res
> path_resolved
) && (*--path_res
!= '/'));
99 *path_res
++ = *path_cpy
++;
102 /* remove trailing slash if not root / */
103 if ((path_res
> (path_resolved
+1)) && (path_res
[-1] == '/'))
105 else if (path_res
== path_resolved
)
110 return path_resolved
;
113 /* Returns NULL on error.
114 ** NB: improperly encoded URL should give client 400 [Bad Syntax]; returning
115 ** NULL here causes 404 [Not Found], but that's not too unreasonable. */
116 static struct path_info
*
117 uh_path_lookup(struct client
*cl
, const char *url
)
119 static char path_phys
[PATH_MAX
];
120 static char path_info
[PATH_MAX
];
121 static struct path_info p
;
123 const char *docroot
= conf
.docroot
;
124 int docroot_len
= strlen(docroot
);
125 char *pathptr
= NULL
;
131 struct index_file
*idx
;
133 /* back out early if url is undefined */
137 memset(&p
, 0, sizeof(p
));
141 strcpy(uh_buf
, docroot
);
143 /* separate query string from url */
144 if ((pathptr
= strchr(url
, '?')) != NULL
) {
145 p
.query
= pathptr
[1] ? pathptr
+ 1 : NULL
;
147 /* urldecode component w/o query */
149 if (uh_urldecode(&uh_buf
[docroot_len
],
150 sizeof(uh_buf
) - docroot_len
- 1,
151 url
, pathptr
- url
) < 0)
156 /* no query string, decode all of url */
157 else if (uh_urldecode(&uh_buf
[docroot_len
],
158 sizeof(uh_buf
) - docroot_len
- 1,
159 url
, strlen(url
) ) < 0)
162 /* create canon path */
163 len
= strlen(uh_buf
);
164 slash
= len
&& uh_buf
[len
- 1] == '/';
165 len
= min(len
, sizeof(path_phys
) - 1);
167 for (i
= len
; i
>= 0; i
--) {
171 if (ch
!= 0 && ch
!= '/')
175 exists
= !!canonpath(uh_buf
, path_phys
);
178 snprintf(path_info
, sizeof(path_info
), "%s", uh_buf
+ i
);
182 /* check whether found path is within docroot */
183 if (strncmp(path_phys
, docroot
, docroot_len
) != 0 ||
184 (path_phys
[docroot_len
] != 0 &&
185 path_phys
[docroot_len
] != '/'))
188 /* test current path */
189 if (stat(path_phys
, &p
.stat
))
192 /* is a regular file */
193 if (p
.stat
.st_mode
& S_IFREG
) {
196 p
.name
= &path_phys
[docroot_len
];
197 p
.info
= path_info
[0] ? path_info
: NULL
;
201 if (!(p
.stat
.st_mode
& S_IFDIR
))
207 pathptr
= path_phys
+ strlen(path_phys
);
209 /* ensure trailing slash */
210 if (pathptr
[-1] != '/') {
216 /* if requested url resolves to a directory and a trailing slash
217 is missing in the request url, redirect the client to the same
218 url with trailing slash appended */
220 uh_http_header(cl
, 302, "Found");
221 ustream_printf(cl
->us
, "Location: %s%s%s\r\n\r\n",
222 &path_phys
[docroot_len
],
224 p
.query
? p
.query
: "");
230 /* try to locate index file */
231 len
= path_phys
+ sizeof(path_phys
) - pathptr
- 1;
232 list_for_each_entry(idx
, &index_files
, list
) {
233 if (strlen(idx
->name
) > len
)
236 strcpy(pathptr
, idx
->name
);
237 if (!stat(path_phys
, &s
) && (s
.st_mode
& S_IFREG
))
245 p
.name
= &path_phys
[docroot_len
];
247 return p
.phys
? &p
: NULL
;
251 time_t timegm (struct tm
*tm
);
254 static const char * uh_file_mime_lookup(const char *path
)
256 struct mimetype
*m
= &uh_mime_types
[0];
260 e
= &path
[strlen(path
)-1];
263 if ((*e
== '.' || *e
== '/') && !strcasecmp(&e
[1], m
->extn
))
272 return "application/octet-stream";
275 static const char * uh_file_mktag(struct stat
*s
)
277 snprintf(_tag
, sizeof(_tag
), "\"%x-%x-%x\"",
278 (unsigned int) s
->st_ino
,
279 (unsigned int) s
->st_size
,
280 (unsigned int) s
->st_mtime
);
285 static time_t uh_file_date2unix(const char *date
)
289 memset(&t
, 0, sizeof(t
));
291 if (strptime(date
, "%a, %d %b %Y %H:%M:%S %Z", &t
) != NULL
)
297 static char * uh_file_unix2date(time_t ts
)
299 struct tm
*t
= gmtime(&ts
);
301 strftime(_tag
, sizeof(_tag
), "%a, %d %b %Y %H:%M:%S GMT", t
);
306 static char *uh_file_header(struct client
*cl
, int idx
)
308 if (!cl
->dispatch
.file
.hdr
[idx
])
311 return (char *) blobmsg_data(cl
->dispatch
.file
.hdr
[idx
]);
314 static void uh_file_response_ok_hdrs(struct client
*cl
, struct stat
*s
)
317 ustream_printf(cl
->us
, "ETag: %s\r\n", uh_file_mktag(s
));
318 ustream_printf(cl
->us
, "Last-Modified: %s\r\n",
319 uh_file_unix2date(s
->st_mtime
));
321 ustream_printf(cl
->us
, "Date: %s\r\n", uh_file_unix2date(time(NULL
)));
324 static void uh_file_response_200(struct client
*cl
, struct stat
*s
)
326 uh_http_header(cl
, 200, "OK");
327 return uh_file_response_ok_hdrs(cl
, s
);
330 static void uh_file_response_304(struct client
*cl
, struct stat
*s
)
332 uh_http_header(cl
, 304, "Not Modified");
334 return uh_file_response_ok_hdrs(cl
, s
);
337 static void uh_file_response_412(struct client
*cl
)
339 uh_http_header(cl
, 412, "Precondition Failed");
342 static bool uh_file_if_match(struct client
*cl
, struct stat
*s
)
344 const char *tag
= uh_file_mktag(s
);
345 char *hdr
= uh_file_header(cl
, HDR_IF_MATCH
);
353 for (i
= 0; i
< strlen(hdr
); i
++)
355 if ((hdr
[i
] == ' ') || (hdr
[i
] == ',')) {
358 } else if (!strcmp(p
, "*") || !strcmp(p
, tag
)) {
363 uh_file_response_412(cl
);
367 static int uh_file_if_modified_since(struct client
*cl
, struct stat
*s
)
369 char *hdr
= uh_file_header(cl
, HDR_IF_MODIFIED_SINCE
);
374 if (uh_file_date2unix(hdr
) >= s
->st_mtime
) {
375 uh_file_response_304(cl
, s
);
382 static int uh_file_if_none_match(struct client
*cl
, struct stat
*s
)
384 const char *tag
= uh_file_mktag(s
);
385 char *hdr
= uh_file_header(cl
, HDR_IF_NONE_MATCH
);
393 for (i
= 0; i
< strlen(hdr
); i
++) {
394 if ((hdr
[i
] == ' ') || (hdr
[i
] == ',')) {
397 } else if (!strcmp(p
, "*") || !strcmp(p
, tag
)) {
398 if ((cl
->request
.method
== UH_HTTP_MSG_GET
) ||
399 (cl
->request
.method
== UH_HTTP_MSG_HEAD
))
400 uh_file_response_304(cl
, s
);
402 uh_file_response_412(cl
);
411 static int uh_file_if_range(struct client
*cl
, struct stat
*s
)
413 char *hdr
= uh_file_header(cl
, HDR_IF_RANGE
);
416 uh_file_response_412(cl
);
423 static int uh_file_if_unmodified_since(struct client
*cl
, struct stat
*s
)
425 char *hdr
= uh_file_header(cl
, HDR_IF_UNMODIFIED_SINCE
);
427 if (hdr
&& uh_file_date2unix(hdr
) <= s
->st_mtime
) {
428 uh_file_response_412(cl
);
436 static int uh_file_scandir_filter_dir(const struct dirent
*e
)
438 return strcmp(e
->d_name
, ".") ? 1 : 0;
441 static void uh_file_dirlist(struct client
*cl
, struct path_info
*pi
)
445 char filename
[PATH_MAX
];
447 struct dirent
**files
= NULL
;
450 uh_file_response_200(cl
, NULL
);
451 ustream_printf(cl
->us
, "Content-Type: text/html\r\n\r\n");
454 "<html><head><title>Index of %s</title></head>"
455 "<body><h1>Index of %s</h1><hr /><ol>",
458 if ((count
= scandir(pi
->phys
, &files
, uh_file_scandir_filter_dir
,
461 memset(filename
, 0, sizeof(filename
));
462 memcpy(filename
, pi
->phys
, sizeof(filename
));
463 pathptr
= &filename
[strlen(filename
)];
466 for (i
= 0; i
< count
; i
++) {
467 strncat(filename
, files
[i
]->d_name
,
468 sizeof(filename
) - strlen(files
[i
]->d_name
));
470 if (!stat(filename
, &s
) &&
471 (s
.st_mode
& S_IFDIR
) && (s
.st_mode
& S_IXOTH
))
473 "<li><strong><a href='%s%s/'>%s</a>/"
474 "</strong><br /><small>modified: %s"
475 "<br />directory - %.02f kbyte<br />"
476 "<br /></small></li>",
477 pi
->name
, files
[i
]->d_name
,
479 uh_file_unix2date(s
.st_mtime
),
486 for (i
= 0; i
< count
; i
++) {
487 strncat(filename
, files
[i
]->d_name
,
488 sizeof(filename
) - strlen(files
[i
]->d_name
));
490 if (!stat(filename
, &s
) &&
491 !(s
.st_mode
& S_IFDIR
) && (s
.st_mode
& S_IROTH
))
493 "<li><strong><a href='%s%s'>%s</a>"
494 "</strong><br /><small>modified: %s"
495 "<br />%s - %.02f kbyte<br />"
496 "<br /></small></li>",
497 pi
->name
, files
[i
]->d_name
,
499 uh_file_unix2date(s
.st_mtime
),
500 uh_file_mime_lookup(filename
),
507 uh_chunk_printf(cl
, "</ol><hr /></body></html>");
512 for (i
= 0; i
< count
; i
++)
519 static void file_write_cb(struct client
*cl
)
521 int fd
= cl
->dispatch
.file
.fd
;
524 while (cl
->us
->w
.data_bytes
< 256) {
525 r
= read(fd
, uh_buf
, sizeof(uh_buf
));
536 uh_chunk_write(cl
, uh_buf
, r
);
540 static void uh_file_free(struct client
*cl
)
542 close(cl
->dispatch
.file
.fd
);
545 static void uh_file_data(struct client
*cl
, struct path_info
*pi
, int fd
)
547 /* test preconditions */
548 if (!uh_file_if_modified_since(cl
, &pi
->stat
) ||
549 !uh_file_if_match(cl
, &pi
->stat
) ||
550 !uh_file_if_range(cl
, &pi
->stat
) ||
551 !uh_file_if_unmodified_since(cl
, &pi
->stat
) ||
552 !uh_file_if_none_match(cl
, &pi
->stat
)) {
559 uh_file_response_200(cl
, &pi
->stat
);
561 ustream_printf(cl
->us
, "Content-Type: %s\r\n",
562 uh_file_mime_lookup(pi
->name
));
564 ustream_printf(cl
->us
, "Content-Length: %i\r\n\r\n",
569 if (cl
->request
.method
== UH_HTTP_MSG_HEAD
) {
575 cl
->dispatch
.file
.fd
= fd
;
576 cl
->dispatch
.write_cb
= file_write_cb
;
577 cl
->dispatch
.free
= uh_file_free
;
578 cl
->dispatch
.close_fds
= uh_file_free
;
582 static void uh_file_request(struct client
*cl
, const char *url
,
583 struct path_info
*pi
, struct blob_attr
**tb
)
587 if (!(pi
->stat
.st_mode
& S_IROTH
))
590 if (pi
->stat
.st_mode
& S_IFREG
) {
591 fd
= open(pi
->phys
, O_RDONLY
);
595 cl
->dispatch
.file
.hdr
= tb
;
596 uh_file_data(cl
, pi
, fd
);
597 cl
->dispatch
.file
.hdr
= NULL
;
601 if ((pi
->stat
.st_mode
& S_IFDIR
)) {
602 if (conf
.no_dirlists
)
605 uh_file_dirlist(cl
, pi
);
610 uh_client_error(cl
, 403, "Forbidden",
611 "You don't have permission to access %s on this server.",
615 void uh_dispatch_add(struct dispatch_handler
*d
)
617 list_add_tail(&d
->list
, &dispatch_handlers
);
620 static struct dispatch_handler
*
621 dispatch_find(const char *url
, struct path_info
*pi
)
623 struct dispatch_handler
*d
;
625 list_for_each_entry(d
, &dispatch_handlers
, list
) {
630 if (d
->check_path(pi
, url
))
636 if (d
->check_url(url
))
644 static bool __handle_file_request(struct client
*cl
, const char *url
)
646 static const struct blobmsg_policy hdr_policy
[__HDR_MAX
] = {
647 [HDR_AUTHORIZATION
] = { "authorization", BLOBMSG_TYPE_STRING
},
648 [HDR_IF_MODIFIED_SINCE
] = { "if-modified-since", BLOBMSG_TYPE_STRING
},
649 [HDR_IF_UNMODIFIED_SINCE
] = { "if-unmodified-since", BLOBMSG_TYPE_STRING
},
650 [HDR_IF_MATCH
] = { "if-match", BLOBMSG_TYPE_STRING
},
651 [HDR_IF_NONE_MATCH
] = { "if-none-match", BLOBMSG_TYPE_STRING
},
652 [HDR_IF_RANGE
] = { "if-range", BLOBMSG_TYPE_STRING
},
654 struct dispatch_handler
*d
;
655 struct blob_attr
*tb
[__HDR_MAX
];
656 struct path_info
*pi
;
658 pi
= uh_path_lookup(cl
, url
);
665 blobmsg_parse(hdr_policy
, __HDR_MAX
, tb
, blob_data(cl
->hdr
.head
), blob_len(cl
->hdr
.head
));
666 if (tb
[HDR_AUTHORIZATION
])
667 pi
->auth
= blobmsg_data(tb
[HDR_AUTHORIZATION
]);
669 if (!uh_auth_check(cl
, pi
))
672 d
= dispatch_find(url
, pi
);
674 d
->handle_request(cl
, url
, pi
);
676 uh_file_request(cl
, url
, pi
, tb
);
681 void uh_handle_request(struct client
*cl
)
683 struct dispatch_handler
*d
;
684 const char *url
= cl
->request
.url
;
686 d
= dispatch_find(url
, NULL
);
688 d
->handle_request(cl
, url
, NULL
);
692 if (__handle_file_request(cl
, url
) ||
693 __handle_file_request(cl
, conf
.error_handler
))
696 uh_client_error(cl
, 404, "Not Found", "The requested URL %s was not found on this server.", cl
->request
.url
);