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];
101 static int uh_file_response_ok_hdrs(struct client *cl, struct http_request *req, struct stat *s)
103 ensure_ret(uh_http_sendf(cl, NULL, "Connection: close\r\n"));
107 ensure_ret(uh_http_sendf(cl, NULL, "ETag: %s\r\n", uh_file_mktag(s)));
108 ensure_ret(uh_http_sendf(cl, NULL, "Last-Modified: %s\r\n", uh_file_unix2date(s->st_mtime)));
111 return uh_http_sendf(cl, NULL, "Date: %s\r\n", uh_file_unix2date(time(NULL)));
114 static int uh_file_response_200(struct client *cl, struct http_request *req, struct stat *s)
116 ensure_ret(uh_http_sendf(cl, NULL, "HTTP/%.1f 200 OK\r\n", req->version));
117 return uh_file_response_ok_hdrs(cl, req, s);
120 static int uh_file_response_304(struct client *cl, struct http_request *req, struct stat *s)
122 ensure_ret(uh_http_sendf(cl, NULL, "HTTP/%.1f 304 Not Modified\r\n", req->version));
123 return uh_file_response_ok_hdrs(cl, req, s);
126 static int uh_file_response_412(struct client *cl, struct http_request *req)
128 return uh_http_sendf(cl, NULL,
129 "HTTP/%.1f 412 Precondition Failed\r\n"
130 "Connection: close\r\n", req->version);
133 static int uh_file_if_match(struct client *cl, struct http_request *req, struct stat *s, int *ok)
135 const char *tag = uh_file_mktag(s);
136 char *hdr = uh_file_header_lookup(req, "If-Match");
144 for( i = 0; i < strlen(hdr); i++ )
146 if( (hdr[i] == ' ') || (hdr[i] == ',') )
151 else if( !strcmp(p, "*") || !strcmp(p, tag) )
159 ensure_ret(uh_file_response_412(cl, req));
167 static int uh_file_if_modified_since(struct client *cl, struct http_request *req, struct stat *s, int *ok)
169 char *hdr = uh_file_header_lookup(req, "If-Modified-Since");
174 if( uh_file_date2unix(hdr) >= s->st_mtime )
177 ensure_ret(uh_file_response_304(cl, req, s));
184 static int uh_file_if_none_match(struct client *cl, struct http_request *req, struct stat *s, int *ok)
186 const char *tag = uh_file_mktag(s);
187 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) )
207 if( (req->method == UH_HTTP_MSG_GET) ||
208 (req->method == UH_HTTP_MSG_HEAD) )
209 ensure_ret(uh_file_response_304(cl, req, s));
211 ensure_ret(uh_file_response_412(cl, req));
221 static int uh_file_if_range(struct client *cl, struct http_request *req, struct stat *s, int *ok)
223 char *hdr = uh_file_header_lookup(req, "If-Range");
229 ensure_ret(uh_file_response_412(cl, req));
235 static int uh_file_if_unmodified_since(struct client *cl, struct http_request *req, struct stat *s, int *ok)
237 char *hdr = uh_file_header_lookup(req, "If-Unmodified-Since");
242 if( uh_file_date2unix(hdr) <= s->st_mtime )
245 ensure_ret(uh_file_response_412(cl, req));
253 static int uh_file_scandir_filter_dir(const struct dirent *e)
255 return strcmp(e->d_name, ".") ? 1 : 0;
258 static void uh_file_dirlist(struct client *cl, struct http_request *req, struct path_info *pi)
262 char filename[PATH_MAX];
264 struct dirent **files = NULL;
267 ensure_out(uh_http_sendf(cl, req,
268 "<html><head><title>Index of %s</title></head>"
269 "<body><h1>Index of %s</h1><hr /><ol>",
273 if( (count = scandir(pi->phys, &files, uh_file_scandir_filter_dir, alphasort)) > 0 )
275 memset(filename, 0, sizeof(filename));
276 memcpy(filename, pi->phys, sizeof(filename));
277 pathptr = &filename[strlen(filename)];
280 for( i = 0; i < count; i++ )
282 strncat(filename, files[i]->d_name,
283 sizeof(filename) - strlen(files[i]->d_name));
285 if( !stat(filename, &s) &&
286 (s.st_mode & S_IFDIR) && (s.st_mode & S_IXOTH)
288 ensure_out(uh_http_sendf(cl, req,
289 "<li><strong><a href='%s%s'>%s</a>/</strong><br />"
290 "<small>modified: %s<br />directory - %.02f kbyte"
291 "<br /><br /></small></li>",
292 pi->name, files[i]->d_name, files[i]->d_name,
293 uh_file_unix2date(s.st_mtime), s.st_size / 1024.0
300 for( i = 0; i < count; i++ )
302 strncat(filename, files[i]->d_name,
303 sizeof(filename) - strlen(files[i]->d_name));
305 if( !stat(filename, &s) &&
306 !(s.st_mode & S_IFDIR) && (s.st_mode & S_IROTH)
308 ensure_out(uh_http_sendf(cl, req,
309 "<li><strong><a href='%s%s'>%s</a></strong><br />"
310 "<small>modified: %s<br />%s - %.02f kbyte<br />"
311 "<br /></small></li>",
312 pi->name, files[i]->d_name, files[i]->d_name,
313 uh_file_unix2date(s.st_mtime),
314 uh_file_mime_lookup(filename), s.st_size / 1024.0
321 ensure_out(uh_http_sendf(cl, req, "</ol><hr /></body></html>"));
322 ensure_out(uh_http_sendf(cl, req, ""));
327 for( i = 0; i < count; i++ )
335 void uh_file_request(struct client *cl, struct http_request *req, struct path_info *pi)
340 char buf[UH_LIMIT_MSGHEAD];
343 if( (pi->stat.st_mode & S_IFREG) && ((fd = open(pi->phys, O_RDONLY)) > 0) )
345 /* test preconditions */
346 if(ok) ensure_out(uh_file_if_modified_since(cl, req, &pi->stat, &ok));
347 if(ok) ensure_out(uh_file_if_match(cl, req, &pi->stat, &ok));
348 if(ok) ensure_out(uh_file_if_range(cl, req, &pi->stat, &ok));
349 if(ok) ensure_out(uh_file_if_unmodified_since(cl, req, &pi->stat, &ok));
350 if(ok) ensure_out(uh_file_if_none_match(cl, req, &pi->stat, &ok));
355 ensure_out(uh_file_response_200(cl, req, &pi->stat));
357 ensure_out(uh_http_sendf(cl, NULL, "Content-Type: %s\r\n", uh_file_mime_lookup(pi->name)));
358 ensure_out(uh_http_sendf(cl, NULL, "Content-Length: %i\r\n", pi->stat.st_size));
360 /* if request was HTTP 1.1 we'll respond chunked */
361 if( (req->version > 1.0) && (req->method != UH_HTTP_MSG_HEAD) )
362 ensure_out(uh_http_send(cl, NULL, "Transfer-Encoding: chunked\r\n", -1));
365 ensure_out(uh_http_send(cl, NULL, "\r\n", -1));
368 if( req->method != UH_HTTP_MSG_HEAD )
371 while( (rlen = read(fd, buf, sizeof(buf))) > 0 )
372 ensure_out(uh_http_send(cl, req, buf, rlen));
374 /* send trailer in chunked mode */
375 ensure_out(uh_http_send(cl, req, "", 0));
379 /* one of the preconditions failed, terminate opened header and exit */
382 ensure_out(uh_http_send(cl, NULL, "\r\n", -1));
387 else if( (pi->stat.st_mode & S_IFDIR) && !cl->server->conf->no_dirlists )
390 ensure_out(uh_file_response_200(cl, req, NULL));
392 if( req->version > 1.0 )
393 ensure_out(uh_http_send(cl, NULL, "Transfer-Encoding: chunked\r\n", -1));
395 ensure_out(uh_http_send(cl, NULL, "Content-Type: text/html\r\n\r\n", -1));
398 uh_file_dirlist(cl, req, pi);
404 ensure_out(uh_http_sendhf(cl, 403, "Forbidden",
405 "Access to this resource is forbidden"));