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nginx 0.1.19
[nginx-catap.git] / src / http / modules / ngx_http_static_handler.c
blob1ff45da60ad389258f7713d25116edef6cb4427c
1
2 /*
3 * Copyright (C) Igor Sysoev
4 */
5
6
7 #include <ngx_config.h>
8 #include <ngx_core.h>
9 #include <ngx_http.h>
10
11
12 typedef struct {
13 ngx_http_cache_hash_t *redirect_cache;
14 } ngx_http_static_loc_conf_t;
15
16
17 static ngx_int_t ngx_http_static_handler(ngx_http_request_t *r);
18 static void *ngx_http_static_create_loc_conf(ngx_conf_t *cf);
19 static char *ngx_http_static_merge_loc_conf(ngx_conf_t *cf,
20 void *parent, void *child);
21 static ngx_int_t ngx_http_static_init(ngx_cycle_t *cycle);
22
23
24 static ngx_command_t ngx_http_static_commands[] = {
25
26 #if (NGX_HTTP_CACHE)
27
28 { ngx_string("redirect_cache"),
29 NGX_HTTP_MAIN_CONF|NGX_HTTP_SRV_CONF|NGX_HTTP_LOC_CONF|NGX_CONF_TAKE3,
30 ngx_http_set_cache_slot,
31 NGX_HTTP_LOC_CONF_OFFSET,
32 offsetof(ngx_http_static_loc_conf_t, redirect_cache),
33 NULL },
34
35 #endif
36
37 ngx_null_command
38 };
39
40
41
42 ngx_http_module_t ngx_http_static_module_ctx = {
43 NULL, /* pre conf */
44
45 NULL, /* create main configuration */
46 NULL, /* init main configuration */
47
48 NULL, /* create server configuration */
49 NULL, /* merge server configuration */
50
51 ngx_http_static_create_loc_conf, /* create location configuration */
52 ngx_http_static_merge_loc_conf /* merge location configuration */
53 };
54
55
56 ngx_module_t ngx_http_static_module = {
57 NGX_MODULE,
58 &ngx_http_static_module_ctx, /* module context */
59 ngx_http_static_commands, /* module directives */
60 NGX_HTTP_MODULE, /* module type */
61 ngx_http_static_init, /* init module */
62 NULL /* init child */
63 };
64
65
66 static ngx_int_t ngx_http_static_handler(ngx_http_request_t *r)
67 {
68 u_char *last;
69 ngx_fd_t fd;
70 ngx_int_t rc;
71 ngx_uint_t level;
72 ngx_str_t name, location;
73 ngx_err_t err;
74 ngx_log_t *log;
75 ngx_buf_t *b;
76 ngx_chain_t out;
77 ngx_file_info_t fi;
78 ngx_http_cleanup_t *file_cleanup, *redirect_cleanup;
79 ngx_http_core_loc_conf_t *clcf;
80 ngx_http_static_loc_conf_t *slcf;
81 #if (NGX_HTTP_CACHE)
82 uint32_t file_crc, redirect_crc;
83 ngx_http_cache_t *file, *redirect;
84 #endif
85
86 if (r->uri.data[r->uri.len - 1] == '/') {
87 return NGX_DECLINED;
88 }
89
90 /* TODO: Win32 */
91 if (r->zero_in_uri) {
92 return NGX_DECLINED;
93 }
94
95 if (r->method != NGX_HTTP_GET && r->method != NGX_HTTP_HEAD) {
96 return NGX_HTTP_NOT_ALLOWED;
97 }
98
99 rc = ngx_http_discard_body(r);
100
101 if (rc != NGX_OK && rc != NGX_AGAIN) {
102 return rc;
103 }
104
105 #if (NGX_HTTP_CACHE)
106
107 /*
108 * there is a valid cached open file, i.e by the index handler,
109 * and it should be already registered in r->cleanup
110 */
111
112 if (r->cache && !r->cache->expired) {
113 return ngx_http_send_cached(r);
114 }
115
116 #endif
117
118 log = r->connection->log;
119
120 clcf = ngx_http_get_module_loc_conf(r, ngx_http_core_module);
121
122 /*
123 * make a file name, reserve 2 bytes for a trailing '/'
124 * in a possible redirect and for the last '\0'
125 */
126
127 if (clcf->alias) {
128 name.data = ngx_palloc(r->pool, clcf->root.len + r->uri.len + 2
129 - clcf->name.len);
130 if (name.data == NULL) {
131 return NGX_HTTP_INTERNAL_SERVER_ERROR;
132 }
133
134 last = ngx_cpymem(name.data, clcf->root.data, clcf->root.len);
135 last = ngx_cpystrn(last, r->uri.data + clcf->name.len,
136 r->uri.len + 1 - clcf->name.len);
137
138 name.len = last - name.data;
139
140 location.data = ngx_palloc(r->pool, r->uri.len + 2);
141 if (location.data == NULL) {
142 return NGX_HTTP_INTERNAL_SERVER_ERROR;
143 }
144
145 last = ngx_cpystrn(location.data, r->uri.data, r->uri.len + 1);
146
147 #if 0
148 /*
149 * aliases usually have trailling "/",
150 * set it in the start of the possible redirect
151 */
152
153 if (*location.data != '/') {
154 location.data--;
155 }
156 #endif
157
158 location.len = last - location.data + 1;
159
160 } else {
161 name.data = ngx_palloc(r->pool, clcf->root.len + r->uri.len + 2);
162 if (name.data == NULL) {
163 return NGX_HTTP_INTERNAL_SERVER_ERROR;
164 }
165
166 location.data = ngx_cpymem(name.data, clcf->root.data, clcf->root.len);
167 last = ngx_cpystrn(location.data, r->uri.data, r->uri.len + 1);
168
169 name.len = last - name.data;
170 location.len = last - location.data + 1;
171 }
172
173 ngx_log_debug1(NGX_LOG_DEBUG_HTTP, log, 0,
174 "http filename: \"%s\"", name.data);
175
176
177 /* allocate cleanups */
178
179 if (!(file_cleanup = ngx_push_array(&r->cleanup))) {
180 return NGX_HTTP_INTERNAL_SERVER_ERROR;
181 }
182 file_cleanup->valid = 0;
183
184 slcf = ngx_http_get_module_loc_conf(r, ngx_http_static_module);
185 if (slcf->redirect_cache) {
186 if (!(redirect_cleanup = ngx_push_array(&r->cleanup))) {
187 return NGX_HTTP_INTERNAL_SERVER_ERROR;
188 }
189 redirect_cleanup->valid = 0;
190
191 } else {
192 redirect_cleanup = NULL;
193 }
194
195 #if (NGX_HTTP_CACHE)
196
197 /* look up an open files cache */
198
199 if (clcf->open_files) {
200 file = ngx_http_cache_get(clcf->open_files, file_cleanup,
201 &name, &file_crc);
202
203 ngx_log_debug1(NGX_LOG_DEBUG_HTTP, log, 0,
204 "http open file cache get: %p", file);
205
206 if (file && !file->expired) {
207 r->cache = file;
208 return ngx_http_send_cached(r);
209 }
210
211 } else {
212 file = NULL;
213 }
214
215
216 /* look up an redirect cache */
217
218 if (slcf->redirect_cache) {
219 redirect = ngx_http_cache_get(slcf->redirect_cache, redirect_cleanup,
220 &name, &redirect_crc);
221
222 ngx_log_debug1(NGX_LOG_DEBUG_HTTP, log, 0,
223 "http redirect cache get: %p", redirect);
224
225 if (redirect && !redirect->expired) {
226
227 /*
228 * We do not copy a cached value so the cache entry is locked
229 * until the end of the request. In a single threaded model
230 * the redirected request should complete before other event
231 * will be processed. In a multithreaded model this locking
232 * should keep more popular redirects in cache.
233 */
234
235 if (!(r->headers_out.location =
236 ngx_http_add_header(&r->headers_out, ngx_http_headers_out)))
237 {
238 return NGX_HTTP_INTERNAL_SERVER_ERROR;
239 }
240
241 r->headers_out.location->value = redirect->data.value;
242
243 return NGX_HTTP_MOVED_PERMANENTLY;
244 }
245
246 } else {
247 redirect = NULL;
248 }
249
250 #endif
251
252 /* open file */
253
254 #if (NGX_WIN9X)
255
256 /* TODO: redirect cache */
257
258 if (ngx_win32_version < NGX_WIN_NT) {
259
260 /*
261 * there is no way to open a file or a directory in Win9X with
262 * one syscall because Win9X has no FILE_FLAG_BACKUP_SEMANTICS flag
263 * so we need to check its type before the opening
264 */
265
266 if (ngx_file_info(name.data, &fi) == NGX_FILE_ERROR) {
267 err = ngx_errno;
268 ngx_log_error(NGX_LOG_ERR, log, err,
269 ngx_file_info_n " \"%s\" failed", name.data);
270
271 if (err == NGX_ENOENT || err == NGX_ENOTDIR) {
272 return NGX_HTTP_NOT_FOUND;
273
274 } else if (err == NGX_EACCES) {
275 return NGX_HTTP_FORBIDDEN;
276
277 } else {
278 return NGX_HTTP_INTERNAL_SERVER_ERROR;
279 }
280 }
281
282 if (ngx_is_dir(&fi)) {
283 ngx_log_debug1(NGX_LOG_DEBUG_HTTP, log, 0,
284 "HTTP DIR: \"%s\"", name.data);
285
286 if (!(r->headers_out.location =
287 ngx_http_add_header(&r->headers_out, ngx_http_headers_out)))
288 {
289 return NGX_HTTP_INTERNAL_SERVER_ERROR;
290 }
291
292 *last++ = '/';
293 *last = '\0';
294 r->headers_out.location->value.len = last - location;
295 r->headers_out.location->value.data = location;
296
297 return NGX_HTTP_MOVED_PERMANENTLY;
298 }
299 }
300
301 #endif
302
303
304 fd = ngx_open_file(name.data, NGX_FILE_RDONLY, NGX_FILE_OPEN);
305
306 if (fd == NGX_INVALID_FILE) {
307 err = ngx_errno;
308
309 if (err == NGX_ENOENT || err == NGX_ENOTDIR) {
310 level = NGX_LOG_ERR;
311 rc = NGX_HTTP_NOT_FOUND;
312
313 } else if (err == NGX_EACCES) {
314 level = NGX_LOG_ERR;
315 rc = NGX_HTTP_FORBIDDEN;
316
317 } else {
318 level = NGX_LOG_CRIT;
319 rc = NGX_HTTP_INTERNAL_SERVER_ERROR;
320 }
321
322 ngx_log_error(level, log, err,
323 ngx_open_file_n " \"%s\" failed", name.data);
324
325 return rc;
326 }
327
328 ngx_log_debug1(NGX_LOG_DEBUG_HTTP, log, 0, "http static fd: %d", fd);
329
330 if (ngx_fd_info(fd, &fi) == NGX_FILE_ERROR) {
331 ngx_log_error(NGX_LOG_CRIT, log, ngx_errno,
332 ngx_fd_info_n " \"%s\" failed", name.data);
333
334 if (ngx_close_file(fd) == NGX_FILE_ERROR) {
335 ngx_log_error(NGX_LOG_ALERT, log, ngx_errno,
336 ngx_close_file_n " \"%s\" failed", name.data);
337 }
338
339 return NGX_HTTP_INTERNAL_SERVER_ERROR;
340 }
341
342 if (ngx_is_dir(&fi)) {
343
344 ngx_log_debug0(NGX_LOG_DEBUG_HTTP, log, 0, "http dir");
345
346 if (ngx_close_file(fd) == NGX_FILE_ERROR) {
347 ngx_log_error(NGX_LOG_ALERT, log, ngx_errno,
348 ngx_close_file_n " \"%s\" failed", name.data);
349 }
350
351 *last++ = '/';
352 *last = '\0';
353
354 r->headers_out.location = ngx_list_push(&r->headers_out.headers);
355 if (r->headers_out.location == NULL) {
356 return NGX_HTTP_INTERNAL_SERVER_ERROR;
357 }
358
359 r->headers_out.location->value = location;
360
361 #if (NGX_HTTP_CACHE)
362
363 if (slcf->redirect_cache) {
364 if (redirect) {
365 if (location.len == redirect->data.value.len
366 && ngx_memcmp(redirect->data.value.data, location.data,
367 location.len) == 0)
368 {
369 redirect->accessed = ngx_cached_time;
370 redirect->updated = ngx_cached_time;
371
372 /*
373 * we can unlock the cache entry because
374 * we have the local copy anyway
375 */
376
377 ngx_http_cache_unlock(slcf->redirect_cache, redirect, log);
378 redirect_cleanup->valid = 0;
379
380 return NGX_HTTP_MOVED_PERMANENTLY;
381 }
382 }
383
384 location.len++;
385 redirect = ngx_http_cache_alloc(slcf->redirect_cache, redirect,
386 redirect_cleanup,
387 &name, redirect_crc,
388 &location, log);
389 location.len--;
390
391 ngx_log_debug1(NGX_LOG_DEBUG_HTTP, log, 0,
392 "http redirect cache alloc: %p", redirect);
393
394 if (redirect) {
395 redirect->fd = NGX_INVALID_FILE;
396 redirect->accessed = ngx_cached_time;
397 redirect->last_modified = 0;
398 redirect->updated = ngx_cached_time;
399 redirect->memory = 1;
400 ngx_http_cache_unlock(slcf->redirect_cache, redirect, log);
401 redirect_cleanup->valid = 0;
402 }
403
404 }
405
406 #endif
407
408 return NGX_HTTP_MOVED_PERMANENTLY;
409 }
410
411 #if !(NGX_WIN32) /* the not regular files are probably Unix specific */
412
413 if (!ngx_is_file(&fi)) {
414 ngx_log_error(NGX_LOG_CRIT, log, ngx_errno,
415 "\"%s\" is not a regular file", name.data);
416
417 if (ngx_close_file(fd) == NGX_FILE_ERROR) {
418 ngx_log_error(NGX_LOG_ALERT, log, ngx_errno,
419 ngx_close_file_n " \"%s\" failed", name.data);
420 }
421
422 return NGX_HTTP_NOT_FOUND;
423 }
424
425 #endif
426
427
428 #if (NGX_HTTP_CACHE)
429
430 if (clcf->open_files) {
431
432 #if (NGX_USE_HTTP_FILE_CACHE_UNIQ)
433
434 if (file && file->uniq == ngx_file_uniq(&fi)) {
435 if (ngx_close_file(fd) == NGX_FILE_ERROR) {
436 ngx_log_error(NGX_LOG_ALERT, log, ngx_errno,
437 ngx_close_file_n " \"%s\" failed", name.data);
438 }
439 file->accessed = ngx_cached_time;
440 file->updated = ngx_cached_time;
441 file->expired = 0;
442 r->cache = file;
443
444 return ngx_http_send_cached(r);
445
446 } else {
447 if (file) {
448 ngx_http_cache_unlock(clcf->open_files, file, log);
449 file = NULL;
450 }
451
452 file = ngx_http_cache_alloc(clcf->open_files, file,
453 file_cleanup,
454 &name, file_crc, NULL, log);
455 if (file) {
456 file->uniq = ngx_file_uniq(&fi);
457 }
458 }
459
460 #else
461 file = ngx_http_cache_alloc(clcf->open_files, file,
462 file_cleanup,
463 &name, file_crc, NULL, log);
464 #endif
465
466 ngx_log_debug1(NGX_LOG_DEBUG_HTTP, log, 0,
467 "http open file cache alloc: %p", file);
468
469 if (file) {
470 file->fd = fd;
471 file->data.size = ngx_file_size(&fi);
472 file->accessed = ngx_cached_time;
473 file->last_modified = ngx_file_mtime(&fi);
474 file->updated = ngx_cached_time;
475 r->cache = file;
476 }
477
478 return ngx_http_send_cached(r);
479 }
480
481 #endif
482
483 log->action = "sending response to client";
484
485 file_cleanup->data.file.fd = fd;
486 file_cleanup->data.file.name = name.data;
487 file_cleanup->valid = 1;
488 file_cleanup->cache = 0;
489
490 r->headers_out.status = NGX_HTTP_OK;
491 r->headers_out.content_length_n = ngx_file_size(&fi);
492 r->headers_out.last_modified_time = ngx_file_mtime(&fi);
493
494 if (r->headers_out.content_length_n == 0) {
495 r->header_only = 1;
496 }
497
498 if (ngx_http_set_content_type(r) != NGX_OK) {
499 return NGX_HTTP_INTERNAL_SERVER_ERROR;
500 }
501
502 #if (NGX_SUPPRESS_WARN)
503 b = NULL;
504 #endif
505
506 if (!r->header_only) {
507 /* we need to allocate all before the header would be sent */
508
509 if (!(b = ngx_pcalloc(r->pool, sizeof(ngx_buf_t)))) {
510 return NGX_HTTP_INTERNAL_SERVER_ERROR;
511 }
512
513 if (!(b->file = ngx_pcalloc(r->pool, sizeof(ngx_file_t)))) {
514 return NGX_HTTP_INTERNAL_SERVER_ERROR;
515 }
516
517 r->filter_allow_ranges = 1;
518 }
519
520 rc = ngx_http_send_header(r);
521
522 if (rc == NGX_ERROR || rc > NGX_OK || r->header_only) {
523 return rc;
524 }
525
526 b->in_file = 1;
527
528 if (!r->main) {
529 b->last_buf = 1;
530 }
531
532 b->file_pos = 0;
533 b->file_last = ngx_file_size(&fi);
534
535 b->file->fd = fd;
536 b->file->name = name;
537 b->file->log = log;
538
539 out.buf = b;
540 out.next = NULL;
541
542 return ngx_http_output_filter(r, &out);
543 }
544
545
546 static void *ngx_http_static_create_loc_conf(ngx_conf_t *cf)
547 {
548 ngx_http_static_loc_conf_t *conf;
549
550 if (!(conf = ngx_palloc(cf->pool, sizeof(ngx_http_static_loc_conf_t)))) {
551 return NGX_CONF_ERROR;
552 }
553
554 conf->redirect_cache = NULL;
555
556 return conf;
557 }
558
559
560 static char *ngx_http_static_merge_loc_conf(ngx_conf_t *cf,
561 void *parent, void *child)
562 {
563 ngx_http_static_loc_conf_t *prev = parent;
564 ngx_http_static_loc_conf_t *conf = child;
565
566 if (conf->redirect_cache == NULL) {
567 conf->redirect_cache = prev->redirect_cache;
568 }
569
570 return NGX_CONF_OK;
571 }
572
573
574 static ngx_int_t ngx_http_static_init(ngx_cycle_t *cycle)
575 {
576 ngx_http_handler_pt *h;
577 ngx_http_core_main_conf_t *cmcf;
578
579 cmcf = ngx_http_cycle_get_module_main_conf(cycle, ngx_http_core_module);
580
581 h = ngx_push_array(&cmcf->phases[NGX_HTTP_CONTENT_PHASE].handlers);
582 if (h == NULL) {
583 return NGX_ERROR;
584 }
585
586 *h = ngx_http_static_handler;
587
588 return NGX_OK;
589 }
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