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];
34 ps = strrchr(path, '/');
35 pd = strrchr(path, '.');
37 /* use either slash or dot as separator, whatever comes last */
38 p = (ps && pd && (ps > pd)) ? ps : pd;
40 if( (p != NULL) && (*(++p) != 0) )
44 if( ! strcasecmp(p, m->extn) )
51 return "application/octet-stream";
54 static const char * uh_file_mktag(struct stat *s)
58 snprintf(tag, sizeof(tag), "\"%x-%x-%x\"",
59 (unsigned int) s->st_ino,
60 (unsigned int) s->st_size,
61 (unsigned int) s->st_mtime
67 static time_t uh_file_date2unix(const char *date)
71 memset(&t, 0, sizeof(t));
73 if( strptime(date, "%a, %d %b %Y %H:%M:%S %Z", &t) != NULL )
79 static char * uh_file_unix2date(time_t ts)
82 struct tm *t = gmtime(&ts);
84 strftime(str, sizeof(str), "%a, %d %b %Y %H:%M:%S GMT", t);
89 static char * uh_file_header_lookup(struct http_request *req, const char *name)
93 foreach_header(i, req->headers)
95 if( ! strcasecmp(req->headers[i], name) )
96 return req->headers[i+1];
102 static void uh_file_response_ok_hdrs(struct client *cl, struct http_request *req, struct stat *s)
104 uh_http_sendf(cl, NULL, "Connection: close\r\n");
108 uh_http_sendf(cl, NULL, "ETag: %s\r\n", uh_file_mktag(s));
109 uh_http_sendf(cl, NULL, "Last-Modified: %s\r\n", uh_file_unix2date(s->st_mtime));
112 uh_http_sendf(cl, NULL, "Date: %s\r\n", uh_file_unix2date(time(NULL)));
115 static void uh_file_response_200(struct client *cl, struct http_request *req, struct stat *s)
117 uh_http_sendf(cl, NULL, "HTTP/%.1f 200 OK\r\n", req->version);
118 uh_file_response_ok_hdrs(cl, req, s);
121 static void uh_file_response_304(struct client *cl, struct http_request *req, struct stat *s)
123 uh_http_sendf(cl, NULL, "HTTP/%.1f 304 Not Modified\r\n", req->version);
124 uh_file_response_ok_hdrs(cl, req, s);
127 static void uh_file_response_412(struct client *cl, struct http_request *req)
129 uh_http_sendf(cl, NULL,
130 "HTTP/%.1f 412 Precondition Failed\r\n"
131 "Connection: close\r\n", req->version);
134 static int uh_file_if_match(struct client *cl, struct http_request *req, struct stat *s)
136 const char *tag = uh_file_mktag(s);
137 char *hdr = uh_file_header_lookup(req, "If-Match");
145 for( i = 0; i < strlen(hdr); i++ )
147 if( (hdr[i] == ' ') || (hdr[i] == ',') )
152 else if( !strcmp(p, "*") || !strcmp(p, tag) )
158 uh_file_response_412(cl, req);
165 static int uh_file_if_modified_since(struct client *cl, struct http_request *req, struct stat *s)
167 char *hdr = uh_file_header_lookup(req, "If-Modified-Since");
171 if( uh_file_date2unix(hdr) < s->st_mtime )
177 uh_file_response_304(cl, req, s);
185 static int uh_file_if_none_match(struct client *cl, struct http_request *req, struct stat *s)
187 const char *tag = uh_file_mktag(s);
188 char *hdr = uh_file_header_lookup(req, "If-None-Match");
196 for( i = 0; i < strlen(hdr); i++ )
198 if( (hdr[i] == ' ') || (hdr[i] == ',') )
203 else if( !strcmp(p, "*") || !strcmp(p, tag) )
205 if( (req->method == UH_HTTP_MSG_GET) ||
206 (req->method == UH_HTTP_MSG_HEAD) )
207 uh_file_response_304(cl, req, s);
209 uh_file_response_412(cl, req);
219 static int uh_file_if_range(struct client *cl, struct http_request *req, struct stat *s)
221 char *hdr = uh_file_header_lookup(req, "If-Range");
225 uh_file_response_412(cl, req);
232 static int uh_file_if_unmodified_since(struct client *cl, struct http_request *req, struct stat *s)
234 char *hdr = uh_file_header_lookup(req, "If-Unmodified-Since");
238 if( uh_file_date2unix(hdr) <= s->st_mtime )
240 uh_file_response_412(cl, req);
249 static int uh_file_scandir_filter_dir(const struct dirent *e)
251 return strcmp(e->d_name, ".") ? 1 : 0;
254 static void uh_file_dirlist(struct client *cl, struct http_request *req, struct path_info *pi)
257 char filename[PATH_MAX];
259 struct dirent **files = NULL;
262 uh_http_sendf(cl, req,
263 "<html><head><title>Index of %s</title></head>"
264 "<body><h1>Index of %s</h1><hr /><ol>",
268 if( (count = scandir(pi->phys, &files, uh_file_scandir_filter_dir, alphasort)) > 0 )
270 memset(filename, 0, sizeof(filename));
271 memcpy(filename, pi->phys, sizeof(filename));
272 pathptr = &filename[strlen(filename)];
275 for( i = 0; i < count; i++ )
277 strncat(filename, files[i]->d_name,
278 sizeof(filename) - strlen(files[i]->d_name));
280 if( !stat(filename, &s) && (s.st_mode & S_IFDIR) )
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) && !(s.st_mode & S_IFDIR) )
299 uh_http_sendf(cl, req,
300 "<li><strong><a href='%s%s'>%s</a></strong><br />"
301 "<small>modified: %s<br />%s - %.02f kbyte<br />"
302 "<br /></small></li>",
303 pi->name, files[i]->d_name, files[i]->d_name,
304 uh_file_unix2date(s.st_mtime),
305 uh_file_mime_lookup(filename), s.st_size / 1024.0
315 uh_http_sendf(cl, req, "</ol><hr /></body></html>");
316 uh_http_sendf(cl, req, "");
320 void uh_file_request(struct client *cl, struct http_request *req, struct path_info *pi)
323 char buf[UH_LIMIT_MSGHEAD];
326 if( (pi->stat.st_mode & S_IFREG) && ((fd = open(pi->phys, O_RDONLY)) > 0) )
328 /* test preconditions */
330 uh_file_if_modified_since(cl, req, &pi->stat) &&
331 uh_file_if_match(cl, req, &pi->stat) &&
332 uh_file_if_range(cl, req, &pi->stat) &&
333 uh_file_if_unmodified_since(cl, req, &pi->stat) &&
334 uh_file_if_none_match(cl, req, &pi->stat)
337 uh_file_response_200(cl, req, &pi->stat);
339 uh_http_sendf(cl, NULL, "Content-Type: %s\r\n", uh_file_mime_lookup(pi->name));
340 uh_http_sendf(cl, NULL, "Content-Length: %i\r\n", pi->stat.st_size);
342 /* if request was HTTP 1.1 we'll respond chunked */
343 if( (req->version > 1.0) && (req->method != UH_HTTP_MSG_HEAD) )
344 uh_http_send(cl, NULL, "Transfer-Encoding: chunked\r\n", -1);
347 uh_http_send(cl, NULL, "\r\n", -1);
350 if( req->method != UH_HTTP_MSG_HEAD )
353 while( (rlen = read(fd, buf, sizeof(buf))) > 0 )
355 if( uh_http_send(cl, req, buf, rlen) < 0 )
359 /* send trailer in chunked mode */
360 uh_http_send(cl, req, "", 0);
364 /* one of the preconditions failed, terminate opened header and exit */
367 uh_http_send(cl, NULL, "\r\n", -1);
374 else if( pi->stat.st_mode & S_IFDIR )
377 uh_file_response_200(cl, req, NULL);
379 if( req->version > 1.0 )
380 uh_http_send(cl, NULL, "Transfer-Encoding: chunked\r\n", -1);
382 uh_http_send(cl, NULL, "Content-Type: text/html\r\n\r\n", -1);
385 uh_file_dirlist(cl, req, pi);
391 uh_http_sendhf(cl, 403, "Forbidden",
392 "Access to this resource is forbidden");