Root/package/uhttpd/src/uhttpd-file.c

1/*
2 * uhttpd - Tiny single-threaded httpd - Static file handler
3 *
4 * Copyright (C) 2010-2011 Jo-Philipp Wich <xm@subsignal.org>
5 *
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
9 *
10 * http://www.apache.org/licenses/LICENSE-2.0
11 *
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.
17 */
18
19#define _XOPEN_SOURCE 500 /* strptime() */
20#define _BSD_SOURCE /* scandir(), timegm() */
21
22#include "uhttpd.h"
23#include "uhttpd-utils.h"
24#include "uhttpd-file.h"
25
26#include "uhttpd-mimetypes.h"
27
28
29static const char * uh_file_mime_lookup(const char *path)
30{
31    struct mimetype *m = &uh_mime_types[0];
32    const char *e;
33
34    while( m->extn )
35    {
36        e = &path[strlen(path)-1];
37
38        while( e >= path )
39        {
40            if( (*e == '.' || *e == '/') && !strcasecmp(&e[1], m->extn) )
41                return m->mime;
42
43            e--;
44        }
45
46        m++;
47    }
48
49    return "application/octet-stream";
50}
51
52static const char * uh_file_mktag(struct stat *s)
53{
54    static char tag[128];
55
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
60    );
61
62    return tag;
63}
64
65static time_t uh_file_date2unix(const char *date)
66{
67    struct tm t;
68
69    memset(&t, 0, sizeof(t));
70
71    if( strptime(date, "%a, %d %b %Y %H:%M:%S %Z", &t) != NULL )
72        return timegm(&t);
73
74    return 0;
75}
76
77static char * uh_file_unix2date(time_t ts)
78{
79    static char str[128];
80    struct tm *t = gmtime(&ts);
81
82    strftime(str, sizeof(str), "%a, %d %b %Y %H:%M:%S GMT", t);
83
84    return str;
85}
86
87static char * uh_file_header_lookup(struct http_request *req, const char *name)
88{
89    int i;
90
91    foreach_header(i, req->headers)
92    {
93        if( ! strcasecmp(req->headers[i], name) )
94            return req->headers[i+1];
95    }
96
97    return NULL;
98}
99
100
101static int uh_file_response_ok_hdrs(struct client *cl, struct http_request *req, struct stat *s)
102{
103    ensure_ret(uh_http_sendf(cl, NULL, "Connection: close\r\n"));
104
105    if( s )
106    {
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)));
109    }
110
111    return uh_http_sendf(cl, NULL, "Date: %s\r\n", uh_file_unix2date(time(NULL)));
112}
113
114static int uh_file_response_200(struct client *cl, struct http_request *req, struct stat *s)
115{
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);
118}
119
120static int uh_file_response_304(struct client *cl, struct http_request *req, struct stat *s)
121{
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);
124}
125
126static int uh_file_response_412(struct client *cl, struct http_request *req)
127{
128    return uh_http_sendf(cl, NULL,
129        "HTTP/%.1f 412 Precondition Failed\r\n"
130        "Connection: close\r\n", req->version);
131}
132
133static int uh_file_if_match(struct client *cl, struct http_request *req, struct stat *s, int *ok)
134{
135    const char *tag = uh_file_mktag(s);
136    char *hdr = uh_file_header_lookup(req, "If-Match");
137    char *p;
138    int i;
139
140    if( hdr )
141    {
142        p = &hdr[0];
143
144        for( i = 0; i < strlen(hdr); i++ )
145        {
146            if( (hdr[i] == ' ') || (hdr[i] == ',') )
147            {
148                hdr[i++] = 0;
149                p = &hdr[i];
150            }
151            else if( !strcmp(p, "*") || !strcmp(p, tag) )
152            {
153                *ok = 1;
154                return *ok;
155            }
156        }
157
158        *ok = 0;
159        ensure_ret(uh_file_response_412(cl, req));
160        return *ok;
161    }
162
163    *ok = 1;
164    return *ok;
165}
166
167static int uh_file_if_modified_since(struct client *cl, struct http_request *req, struct stat *s, int *ok)
168{
169    char *hdr = uh_file_header_lookup(req, "If-Modified-Since");
170    *ok = 1;
171
172    if( hdr )
173    {
174        if( uh_file_date2unix(hdr) >= s->st_mtime )
175        {
176            *ok = 0;
177            ensure_ret(uh_file_response_304(cl, req, s));
178        }
179    }
180
181    return *ok;
182}
183
184static int uh_file_if_none_match(struct client *cl, struct http_request *req, struct stat *s, int *ok)
185{
186    const char *tag = uh_file_mktag(s);
187    char *hdr = uh_file_header_lookup(req, "If-None-Match");
188    char *p;
189    int i;
190    *ok = 1;
191
192    if( hdr )
193    {
194        p = &hdr[0];
195
196        for( i = 0; i < strlen(hdr); i++ )
197        {
198            if( (hdr[i] == ' ') || (hdr[i] == ',') )
199            {
200                hdr[i++] = 0;
201                p = &hdr[i];
202            }
203            else if( !strcmp(p, "*") || !strcmp(p, tag) )
204            {
205                *ok = 0;
206
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));
210                else
211                    ensure_ret(uh_file_response_412(cl, req));
212
213                break;
214            }
215        }
216    }
217
218    return *ok;
219}
220
221static int uh_file_if_range(struct client *cl, struct http_request *req, struct stat *s, int *ok)
222{
223    char *hdr = uh_file_header_lookup(req, "If-Range");
224    *ok = 1;
225
226    if( hdr )
227    {
228        *ok = 0;
229        ensure_ret(uh_file_response_412(cl, req));
230    }
231
232    return *ok;
233}
234
235static int uh_file_if_unmodified_since(struct client *cl, struct http_request *req, struct stat *s, int *ok)
236{
237    char *hdr = uh_file_header_lookup(req, "If-Unmodified-Since");
238    *ok = 1;
239
240    if( hdr )
241    {
242        if( uh_file_date2unix(hdr) <= s->st_mtime )
243        {
244            *ok = 0;
245            ensure_ret(uh_file_response_412(cl, req));
246        }
247    }
248
249    return *ok;
250}
251
252
253static int uh_file_scandir_filter_dir(const struct dirent *e)
254{
255    return strcmp(e->d_name, ".") ? 1 : 0;
256}
257
258static void uh_file_dirlist(struct client *cl, struct http_request *req, struct path_info *pi)
259{
260    int i;
261    int count = 0;
262    char filename[PATH_MAX];
263    char *pathptr;
264    struct dirent **files = NULL;
265    struct stat s;
266
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>",
270            pi->name, pi->name
271    ));
272
273    if( (count = scandir(pi->phys, &files, uh_file_scandir_filter_dir, alphasort)) > 0 )
274    {
275        memset(filename, 0, sizeof(filename));
276        memcpy(filename, pi->phys, sizeof(filename));
277        pathptr = &filename[strlen(filename)];
278
279        /* list subdirs */
280        for( i = 0; i < count; i++ )
281        {
282            strncat(filename, files[i]->d_name,
283                sizeof(filename) - strlen(files[i]->d_name));
284
285            if( !stat(filename, &s) &&
286                (s.st_mode & S_IFDIR) && (s.st_mode & S_IXOTH)
287            )
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
294                ));
295
296            *pathptr = 0;
297        }
298
299        /* list files */
300        for( i = 0; i < count; i++ )
301        {
302            strncat(filename, files[i]->d_name,
303                sizeof(filename) - strlen(files[i]->d_name));
304
305            if( !stat(filename, &s) &&
306                !(s.st_mode & S_IFDIR) && (s.st_mode & S_IROTH)
307            )
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
315                ));
316
317            *pathptr = 0;
318        }
319    }
320
321    ensure_out(uh_http_sendf(cl, req, "</ol><hr /></body></html>"));
322    ensure_out(uh_http_sendf(cl, req, ""));
323
324out:
325    if( files )
326    {
327        for( i = 0; i < count; i++ )
328            free(files[i]);
329
330        free(files);
331    }
332}
333
334
335void uh_file_request(struct client *cl, struct http_request *req, struct path_info *pi)
336{
337    int rlen;
338    int ok = 1;
339    int fd = -1;
340    char buf[UH_LIMIT_MSGHEAD];
341
342    /* we have a file */
343    if( (pi->stat.st_mode & S_IFREG) && ((fd = open(pi->phys, O_RDONLY)) > 0) )
344    {
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));
351
352        if( ok > 0 )
353        {
354            /* write status */
355            ensure_out(uh_file_response_200(cl, req, &pi->stat));
356
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));
359
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));
363
364            /* close header */
365            ensure_out(uh_http_send(cl, NULL, "\r\n", -1));
366
367            /* send body */
368            if( req->method != UH_HTTP_MSG_HEAD )
369            {
370                /* pump file data */
371                while( (rlen = read(fd, buf, sizeof(buf))) > 0 )
372                    ensure_out(uh_http_send(cl, req, buf, rlen));
373
374                /* send trailer in chunked mode */
375                ensure_out(uh_http_send(cl, req, "", 0));
376            }
377        }
378
379        /* one of the preconditions failed, terminate opened header and exit */
380        else
381        {
382            ensure_out(uh_http_send(cl, NULL, "\r\n", -1));
383        }
384    }
385
386    /* directory */
387    else if( (pi->stat.st_mode & S_IFDIR) && !cl->server->conf->no_dirlists )
388    {
389        /* write status */
390        ensure_out(uh_file_response_200(cl, req, NULL));
391
392        if( req->version > 1.0 )
393            ensure_out(uh_http_send(cl, NULL, "Transfer-Encoding: chunked\r\n", -1));
394
395        ensure_out(uh_http_send(cl, NULL, "Content-Type: text/html\r\n\r\n", -1));
396
397        /* content */
398        uh_file_dirlist(cl, req, pi);
399    }
400
401    /* 403 */
402    else
403    {
404        ensure_out(uh_http_sendhf(cl, 403, "Forbidden",
405            "Access to this resource is forbidden"));
406    }
407
408out:
409    if( fd > -1 )
410        close(fd);
411}
412
413

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