2 * uhttpd - Tiny single-threaded httpd - Static file 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.
19 #define _XOPEN_SOURCE 500 /* strptime() */
20 #define _BSD_SOURCE /* scandir(), timegm() */
23 #include "uhttpd-utils.h"
24 #include "uhttpd-file.h"
26 #include "uhttpd-mimetypes.h"
29 static const char * uh_file_mime_lookup(const char *path)
31 struct mimetype *m = &uh_mime_types[0];
36 e = &path[strlen(path)-1];
40 if( (*e == '.') && !strcasecmp(&e[1], m->extn) )
49 return "application/octet-stream";
52 static const char * uh_file_mktag(struct stat *s)
56 snprintf(tag, sizeof(tag), "\"%x-%x-%x\"",
57 (unsigned int) s->st_ino,
58 (unsigned int) s->st_size,
59 (unsigned int) s->st_mtime
65 static time_t uh_file_date2unix(const char *date)
69 memset(&t, 0, sizeof(t));
71 if( strptime(date, "%a, %d %b %Y %H:%M:%S %Z", &t) != NULL )
77 static char * uh_file_unix2date(time_t ts)
80 struct tm *t = gmtime(&ts);
82 strftime(str, sizeof(str), "%a, %d %b %Y %H:%M:%S GMT", t);
87 static char * uh_file_header_lookup(struct http_request *req, const char *name)
91 foreach_header(i, req->headers)
93 if( ! strcasecmp(req->headers[i], name) )
94 return req->headers[i+1];
100 static void uh_file_response_ok_hdrs(struct client *cl, struct http_request *req, struct stat *s)
102 uh_http_sendf(cl, NULL, "Connection: close\r\n");
106 uh_http_sendf(cl, NULL, "ETag: %s\r\n", uh_file_mktag(s));
107 uh_http_sendf(cl, NULL, "Last-Modified: %s\r\n", uh_file_unix2date(s->st_mtime));
110 uh_http_sendf(cl, NULL, "Date: %s\r\n", uh_file_unix2date(time(NULL)));
113 static void uh_file_response_200(struct client *cl, struct http_request *req, struct stat *s)
115 uh_http_sendf(cl, NULL, "HTTP/%.1f 200 OK\r\n", req->version);
116 uh_file_response_ok_hdrs(cl, req, s);
119 static void uh_file_response_304(struct client *cl, struct http_request *req, struct stat *s)
121 uh_http_sendf(cl, NULL, "HTTP/%.1f 304 Not Modified\r\n", req->version);
122 uh_file_response_ok_hdrs(cl, req, s);
125 static void uh_file_response_412(struct client *cl, struct http_request *req)
127 uh_http_sendf(cl, NULL,
128 "HTTP/%.1f 412 Precondition Failed\r\n"
129 "Connection: close\r\n", req->version);
132 static int uh_file_if_match(struct client *cl, struct http_request *req, struct stat *s)
134 const char *tag = uh_file_mktag(s);
135 char *hdr = uh_file_header_lookup(req, "If-Match");
143 for( i = 0; i < strlen(hdr); i++ )
145 if( (hdr[i] == ' ') || (hdr[i] == ',') )
150 else if( !strcmp(p, "*") || !strcmp(p, tag) )
156 uh_file_response_412(cl, req);
163 static int uh_file_if_modified_since(struct client *cl, struct http_request *req, struct stat *s)
165 char *hdr = uh_file_header_lookup(req, "If-Modified-Since");
169 if( uh_file_date2unix(hdr) < s->st_mtime )
175 uh_file_response_304(cl, req, s);
183 static int uh_file_if_none_match(struct client *cl, struct http_request *req, struct stat *s)
185 const char *tag = uh_file_mktag(s);
186 char *hdr = uh_file_header_lookup(req, "If-None-Match");
194 for( i = 0; i < strlen(hdr); i++ )
196 if( (hdr[i] == ' ') || (hdr[i] == ',') )
201 else if( !strcmp(p, "*") || !strcmp(p, tag) )
203 if( (req->method == UH_HTTP_MSG_GET) ||
204 (req->method == UH_HTTP_MSG_HEAD) )
205 uh_file_response_304(cl, req, s);
207 uh_file_response_412(cl, req);
217 static int uh_file_if_range(struct client *cl, struct http_request *req, struct stat *s)
219 char *hdr = uh_file_header_lookup(req, "If-Range");
223 uh_file_response_412(cl, req);
230 static int uh_file_if_unmodified_since(struct client *cl, struct http_request *req, struct stat *s)
232 char *hdr = uh_file_header_lookup(req, "If-Unmodified-Since");
236 if( uh_file_date2unix(hdr) <= s->st_mtime )
238 uh_file_response_412(cl, req);
247 static int uh_file_scandir_filter_dir(const struct dirent *e)
249 return strcmp(e->d_name, ".") ? 1 : 0;
252 static void uh_file_dirlist(struct client *cl, struct http_request *req, struct path_info *pi)
255 char filename[PATH_MAX];
257 struct dirent **files = NULL;
260 uh_http_sendf(cl, req,
261 "<html><head><title>Index of %s</title></head>"
262 "<body><h1>Index of %s</h1><hr /><ol>",
266 if( (count = scandir(pi->phys, &files, uh_file_scandir_filter_dir, alphasort)) > 0 )
268 memset(filename, 0, sizeof(filename));
269 memcpy(filename, pi->phys, sizeof(filename));
270 pathptr = &filename[strlen(filename)];
273 for( i = 0; i < count; i++ )
275 strncat(filename, files[i]->d_name,
276 sizeof(filename) - strlen(files[i]->d_name));
278 if( !stat(filename, &s) &&
279 (s.st_mode & S_IFDIR) && (s.st_mode & S_IXOTH)
281 uh_http_sendf(cl, req,
282 "<li><strong><a href='%s%s'>%s</a>/</strong><br />"
283 "<small>modified: %s<br />directory - %.02f kbyte"
284 "<br /><br /></small></li>",
285 pi->name, files[i]->d_name, files[i]->d_name,
286 uh_file_unix2date(s.st_mtime), s.st_size / 1024.0
293 for( i = 0; i < count; i++ )
295 strncat(filename, files[i]->d_name,
296 sizeof(filename) - strlen(files[i]->d_name));
298 if( !stat(filename, &s) &&
299 !(s.st_mode & S_IFDIR) && (s.st_mode & S_IROTH)
301 uh_http_sendf(cl, req,
302 "<li><strong><a href='%s%s'>%s</a></strong><br />"
303 "<small>modified: %s<br />%s - %.02f kbyte<br />"
304 "<br /></small></li>",
305 pi->name, files[i]->d_name, files[i]->d_name,
306 uh_file_unix2date(s.st_mtime),
307 uh_file_mime_lookup(filename), s.st_size / 1024.0
317 uh_http_sendf(cl, req, "</ol><hr /></body></html>");
318 uh_http_sendf(cl, req, "");
322 void uh_file_request(struct client *cl, struct http_request *req, struct path_info *pi)
325 char buf[UH_LIMIT_MSGHEAD];
328 if( (pi->stat.st_mode & S_IFREG) && ((fd = open(pi->phys, O_RDONLY)) > 0) )
330 /* test preconditions */
332 uh_file_if_modified_since(cl, req, &pi->stat) &&
333 uh_file_if_match(cl, req, &pi->stat) &&
334 uh_file_if_range(cl, req, &pi->stat) &&
335 uh_file_if_unmodified_since(cl, req, &pi->stat) &&
336 uh_file_if_none_match(cl, req, &pi->stat)
339 uh_file_response_200(cl, req, &pi->stat);
341 uh_http_sendf(cl, NULL, "Content-Type: %s\r\n", uh_file_mime_lookup(pi->name));
342 uh_http_sendf(cl, NULL, "Content-Length: %i\r\n", pi->stat.st_size);
344 /* if request was HTTP 1.1 we'll respond chunked */
345 if( (req->version > 1.0) && (req->method != UH_HTTP_MSG_HEAD) )
346 uh_http_send(cl, NULL, "Transfer-Encoding: chunked\r\n", -1);
349 uh_http_send(cl, NULL, "\r\n", -1);
352 if( req->method != UH_HTTP_MSG_HEAD )
355 while( (rlen = read(fd, buf, sizeof(buf))) > 0 )
357 if( uh_http_send(cl, req, buf, rlen) < 0 )
361 /* send trailer in chunked mode */
362 uh_http_send(cl, req, "", 0);
366 /* one of the preconditions failed, terminate opened header and exit */
369 uh_http_send(cl, NULL, "\r\n", -1);
376 else if( (pi->stat.st_mode & S_IFDIR) && !cl->server->conf->no_dirlists )
379 uh_file_response_200(cl, req, NULL);
381 if( req->version > 1.0 )
382 uh_http_send(cl, NULL, "Transfer-Encoding: chunked\r\n", -1);
384 uh_http_send(cl, NULL, "Content-Type: text/html\r\n\r\n", -1);
387 uh_file_dirlist(cl, req, pi);
393 uh_http_sendhf(cl, 403, "Forbidden",
394 "Access to this resource is forbidden");