1
2 /*
3 * Copyright (C) Igor Sysoev
4 */
5
6
7 #include <ngx_config.h>
8 #include <ngx_core.h>
9 #include <ngx_event.h>
10 #include <ngx_http.h>
11
12
13 static void ngx_http_read_client_request_body_handler(ngx_http_request_t *r);
14 static ngx_int_t ngx_http_do_read_client_request_body(ngx_http_request_t *r);
15 static ngx_int_t ngx_http_write_request_body(ngx_http_request_t *r,
16 ngx_chain_t *body);
17 static void ngx_http_read_discarded_request_body_handler(ngx_http_request_t *r);
18 static ngx_int_t ngx_http_read_discarded_request_body(ngx_http_request_t *r);
19
20
21 /*
22 * on completion ngx_http_read_client_request_body() adds to
23 * r->request_body->bufs one or two bufs:
24 * *) one memory buf that was preread in r->header_in;
25 * *) one memory or file buf that contains the rest of the body
26 */
27
28 ngx_int_t
29 ngx_http_read_client_request_body(ngx_http_request_t *r,
30 ngx_http_client_body_handler_pt post_handler)
31 {
32 size_t preread;
33 ssize_t size;
34 ngx_buf_t *b;
35 ngx_chain_t *cl, **next;
36 ngx_temp_file_t *tf;
37 ngx_http_request_body_t *rb;
38 ngx_http_core_loc_conf_t *clcf;
39
40 if (r->request_body || r->discard_body) {
41 post_handler(r);
42 return NGX_OK;
43 }
44
45 rb = ngx_pcalloc(r->pool, sizeof(ngx_http_request_body_t));
46 if (rb == NULL) {
47 return NGX_HTTP_INTERNAL_SERVER_ERROR;
48 }
49
50 r->request_body = rb;
51
52 if (r->headers_in.content_length_n < 0) {
53 post_handler(r);
54 return NGX_OK;
55 }
56
57 clcf = ngx_http_get_module_loc_conf(r, ngx_http_core_module);
58
59 if (r->headers_in.content_length_n == 0) {
60
61 if (r->request_body_in_file_only) {
62 tf = ngx_pcalloc(r->pool, sizeof(ngx_temp_file_t));
63 if (tf == NULL) {
64 return NGX_HTTP_INTERNAL_SERVER_ERROR;
65 }
66
67 tf->file.fd = NGX_INVALID_FILE;
68 tf->file.log = r->connection->log;
69 tf->path = clcf->client_body_temp_path;
70 tf->pool = r->pool;
71 tf->warn = "a client request body is buffered to a temporary file";
72 tf->log_level = r->request_body_file_log_level;
73 tf->persistent = r->request_body_in_persistent_file;
74 tf->clean = r->request_body_in_clean_file;
75
76 if (r->request_body_file_group_access) {
77 tf->access = 0660;
78 }
79
80 rb->temp_file = tf;
81
82 if (ngx_create_temp_file(&tf->file, tf->path, tf->pool,
83 tf->persistent, tf->clean, tf->access)
84 != NGX_OK)
85 {
86 return NGX_HTTP_INTERNAL_SERVER_ERROR;
87 }
88 }
89
90 post_handler(r);
91
92 return NGX_OK;
93 }
94
95 rb->post_handler = post_handler;
96
97 /*
98 * set by ngx_pcalloc():
99 *
100 * rb->bufs = NULL;
101 * rb->buf = NULL;
102 * rb->rest = 0;
103 */
104
105 preread = r->header_in->last - r->header_in->pos;
106
107 if (preread) {
108
109 /* there is the pre-read part of the request body */
110
111 ngx_log_debug1(NGX_LOG_DEBUG_HTTP, r->connection->log, 0,
112 "http client request body preread %uz", preread);
113
114 b = ngx_calloc_buf(r->pool);
115 if (b == NULL) {
116 return NGX_HTTP_INTERNAL_SERVER_ERROR;
117 }
118
119 b->temporary = 1;
120 b->start = r->header_in->pos;
121 b->pos = r->header_in->pos;
122 b->last = r->header_in->last;
123 b->end = r->header_in->end;
124
125 rb->bufs = ngx_alloc_chain_link(r->pool);
126 if (rb->bufs == NULL) {
127 return NGX_HTTP_INTERNAL_SERVER_ERROR;
128 }
129
130 rb->bufs->buf = b;
131 rb->bufs->next = NULL;
132
133 rb->buf = b;
134
135 if ((off_t) preread >= r->headers_in.content_length_n) {
136
137 /* the whole request body was pre-read */
138
139 r->header_in->pos += (size_t) r->headers_in.content_length_n;
140 r->request_length += r->headers_in.content_length_n;
141
142 if (r->request_body_in_file_only) {
143 if (ngx_http_write_request_body(r, rb->bufs) != NGX_OK) {
144 return NGX_HTTP_INTERNAL_SERVER_ERROR;
145 }
146 }
147
148 post_handler(r);
149
150 return NGX_OK;
151 }
152
153 /*
154 * to not consider the body as pipelined request in
155 * ngx_http_set_keepalive()
156 */
157 r->header_in->pos = r->header_in->last;
158
159 r->request_length += preread;
160
161 rb->rest = r->headers_in.content_length_n - preread;
162
163 if (rb->rest <= (off_t) (b->end - b->last)) {
164
165 /* the whole request body may be placed in r->header_in */
166
167 rb->to_write = rb->bufs;
168
169 r->read_event_handler = ngx_http_read_client_request_body_handler;
170
171 return ngx_http_do_read_client_request_body(r);
172 }
173
174 next = &rb->bufs->next;
175
176 } else {
177 b = NULL;
178 rb->rest = r->headers_in.content_length_n;
179 next = &rb->bufs;
180 }
181
182 size = clcf->client_body_buffer_size;
183 size += size >> 2;
184
185 if (rb->rest < size) {
186 size = (ssize_t) rb->rest;
187
188 if (r->request_body_in_single_buf) {
189 size += preread;
190 }
191
192 } else {
193 size = clcf->client_body_buffer_size;
194
195 /* disable copying buffer for r->request_body_in_single_buf */
196 b = NULL;
197 }
198
199 rb->buf = ngx_create_temp_buf(r->pool, size);
200 if (rb->buf == NULL) {
201 return NGX_HTTP_INTERNAL_SERVER_ERROR;
202 }
203
204 cl = ngx_alloc_chain_link(r->pool);
205 if (cl == NULL) {
206 return NGX_HTTP_INTERNAL_SERVER_ERROR;
207 }
208
209 cl->buf = rb->buf;
210 cl->next = NULL;
211
212 if (b && r->request_body_in_single_buf) {
213 size = b->last - b->pos;
214 ngx_memcpy(rb->buf->pos, b->pos, size);
215 rb->buf->last += size;
216
217 next = &rb->bufs;
218 }
219
220 *next = cl;
221
222 if (r->request_body_in_file_only || r->request_body_in_single_buf) {
223 rb->to_write = rb->bufs;
224
225 } else {
226 rb->to_write = rb->bufs->next ? rb->bufs->next : rb->bufs;
227 }
228
229 r->read_event_handler = ngx_http_read_client_request_body_handler;
230
231 return ngx_http_do_read_client_request_body(r);
232 }
233
234
235 static void
236 ngx_http_read_client_request_body_handler(ngx_http_request_t *r)
237 {
238 ngx_int_t rc;
239
240 if (r->connection->read->timedout) {
241 r->connection->timedout = 1;
242 ngx_http_finalize_request(r, NGX_HTTP_REQUEST_TIME_OUT);
243 return;
244 }
245
246 rc = ngx_http_do_read_client_request_body(r);
247
248 if (rc >= NGX_HTTP_SPECIAL_RESPONSE) {
249 ngx_http_finalize_request(r, rc);
250 }
251 }
252
253
254 static ngx_int_t
255 ngx_http_do_read_client_request_body(ngx_http_request_t *r)
256 {
257 size_t size;
258 ssize_t n;
259 ngx_buf_t *b;
260 ngx_connection_t *c;
261 ngx_http_request_body_t *rb;
262 ngx_http_core_loc_conf_t *clcf;
263
264 c = r->connection;
265 rb = r->request_body;
266
267 ngx_log_debug0(NGX_LOG_DEBUG_HTTP, c->log, 0,
268 "http read client request body");
269
270 for ( ;; ) {
271 for ( ;; ) {
272 if (rb->buf->last == rb->buf->end) {
273
274 if (ngx_http_write_request_body(r, rb->to_write) != NGX_OK) {
275 return NGX_HTTP_INTERNAL_SERVER_ERROR;
276 }
277
278 rb->to_write = rb->bufs->next ? rb->bufs->next : rb->bufs;
279 rb->buf->last = rb->buf->start;
280 }
281
282 size = rb->buf->end - rb->buf->last;
283
284 if ((off_t) size > rb->rest) {
285 size = (size_t) rb->rest;
286 }
287
288 n = c->recv(c, rb->buf->last, size);
289
290 ngx_log_debug1(NGX_LOG_DEBUG_HTTP, c->log, 0,
291 "http client request body recv %z", n);
292
293 if (n == NGX_AGAIN) {
294 break;
295 }
296
297 if (n == 0) {
298 ngx_log_error(NGX_LOG_INFO, c->log, 0,
299 "client closed prematurely connection");
300 }
301
302 if (n == 0 || n == NGX_ERROR) {
303 c->error = 1;
304 return NGX_HTTP_BAD_REQUEST;
305 }
306
307 rb->buf->last += n;
308 rb->rest -= n;
309 r->request_length += n;
310
311 if (rb->rest == 0) {
312 break;
313 }
314
315 if (rb->buf->last < rb->buf->end) {
316 break;
317 }
318 }
319
320 ngx_log_debug1(NGX_LOG_DEBUG_HTTP, c->log, 0,
321 "http client request body rest %O", rb->rest);
322
323 if (rb->rest == 0) {
324 break;
325 }
326
327 if (!c->read->ready) {
328 clcf = ngx_http_get_module_loc_conf(r, ngx_http_core_module);
329 ngx_add_timer(c->read, clcf->client_body_timeout);
330
331 if (ngx_handle_read_event(c->read, 0) == NGX_ERROR) {
332 return NGX_HTTP_INTERNAL_SERVER_ERROR;
333 }
334
335 return NGX_AGAIN;
336 }
337 }
338
339 if (c->read->timer_set) {
340 ngx_del_timer(c->read);
341 }
342
343 if (rb->temp_file || r->request_body_in_file_only) {
344
345 /* save the last part */
346
347 if (ngx_http_write_request_body(r, rb->to_write) != NGX_OK) {
348 return NGX_HTTP_INTERNAL_SERVER_ERROR;
349 }
350
351 b = ngx_calloc_buf(r->pool);
352 if (b == NULL) {
353 return NGX_HTTP_INTERNAL_SERVER_ERROR;
354 }
355
356 b->in_file = 1;
357 b->file_pos = 0;
358 b->file_last = rb->temp_file->file.offset;
359 b->file = &rb->temp_file->file;
360
361 if (rb->bufs->next) {
362 rb->bufs->next->buf = b;
363
364 } else {
365 rb->bufs->buf = b;
366 }
367 }
368
369 if (r->request_body_in_file_only && rb->bufs->next) {
370 rb->bufs = rb->bufs->next;
371 }
372
373 rb->post_handler(r);
374
375 return NGX_OK;
376 }
377
378
379 static ngx_int_t
380 ngx_http_write_request_body(ngx_http_request_t *r, ngx_chain_t *body)
381 {
382 ssize_t n;
383 ngx_temp_file_t *tf;
384 ngx_http_request_body_t *rb;
385 ngx_http_core_loc_conf_t *clcf;
386
387 rb = r->request_body;
388
389 if (rb->temp_file == NULL) {
390 tf = ngx_pcalloc(r->pool, sizeof(ngx_temp_file_t));
391 if (tf == NULL) {
392 return NGX_ERROR;
393 }
394
395 clcf = ngx_http_get_module_loc_conf(r, ngx_http_core_module);
396
397 tf->file.fd = NGX_INVALID_FILE;
398 tf->file.log = r->connection->log;
399 tf->path = clcf->client_body_temp_path;
400 tf->pool = r->pool;
401 tf->warn = "a client request body is buffered to a temporary file";
402 tf->log_level = r->request_body_file_log_level;
403 tf->persistent = r->request_body_in_persistent_file;
404 tf->clean = r->request_body_in_clean_file;
405
406 if (r->request_body_file_group_access) {
407 tf->access = 0660;
408 }
409
410 rb->temp_file = tf;
411 }
412
413 n = ngx_write_chain_to_temp_file(rb->temp_file, body);
414
415 /* TODO: n == 0 or not complete and level event */
416
417 if (n == NGX_ERROR) {
418 return NGX_ERROR;
419 }
420
421 rb->temp_file->offset += n;
422
423 return NGX_OK;
424 }
425
426
427 ngx_int_t
428 ngx_http_discard_request_body(ngx_http_request_t *r)
429 {
430 ssize_t size;
431 ngx_event_t *rev;
432
433 if (r != r->main || r->discard_body) {
434 return NGX_OK;
435 }
436
437 rev = r->connection->read;
438
439 ngx_log_debug0(NGX_LOG_DEBUG_HTTP, rev->log, 0, "http set discard body");
440
441 if (rev->timer_set) {
442 ngx_del_timer(rev);
443 }
444
445 if (r->headers_in.content_length_n <= 0 || r->request_body) {
446 return NGX_OK;
447 }
448
449 size = r->header_in->last - r->header_in->pos;
450
451 if (size) {
452 if (r->headers_in.content_length_n > size) {
453 r->headers_in.content_length_n -= size;
454
455 } else {
456 r->header_in->pos += (size_t) r->headers_in.content_length_n;
457 r->headers_in.content_length_n = 0;
458 return NGX_OK;
459 }
460 }
461
462 r->discard_body = 1;
463
464 r->read_event_handler = ngx_http_read_discarded_request_body_handler;
465
466 if (ngx_handle_read_event(rev, 0) == NGX_ERROR) {
467 return NGX_HTTP_INTERNAL_SERVER_ERROR;
468 }
469
470 (void) ngx_http_read_discarded_request_body(r);
471
472 return NGX_OK;
473 }
474
475
476 static void
477 ngx_http_read_discarded_request_body_handler(ngx_http_request_t *r)
478 {
479 ngx_int_t rc;
480 ngx_msec_t timer;
481 ngx_event_t *rev;
482 ngx_connection_t *c;
483 ngx_http_core_loc_conf_t *clcf;
484
485 c = r->connection;
486 rev = c->read;
487
488 if (rev->timedout) {
489 c->timedout = 1;
490 c->error = 1;
491 ngx_http_finalize_request(r, 0);
492 return;
493 }
494
495 if (r->lingering_time) {
496 timer = (ngx_msec_t) (r->lingering_time - ngx_time());
497
498 if (timer <= 0) {
499 r->discard_body = 0;
500 ngx_http_finalize_request(r, 0);
501 return;
502 }
503
504 } else {
505 timer = 0;
506 }
507
508 rc = ngx_http_read_discarded_request_body(r);
509
510 if (rc == NGX_OK) {
511
512 r->discard_body = 0;
513
514 if (r->done) {
515 ngx_http_finalize_request(r, 0);
516 }
517
518 return;
519 }
520
521 /* rc == NGX_AGAIN */
522
523 if (ngx_handle_read_event(rev, 0) == NGX_ERROR) {
524 c->error = 1;
525 ngx_http_finalize_request(r, rc);
526 return;
527 }
528
529 if (timer) {
530
531 clcf = ngx_http_get_module_loc_conf(r, ngx_http_core_module);
532
533 timer *= 1000;
534
535 if (timer > clcf->lingering_timeout) {
536 timer = clcf->lingering_timeout;
537 }
538
539 ngx_add_timer(rev, timer);
540 }
541 }
542
543
544 static ngx_int_t
545 ngx_http_read_discarded_request_body(ngx_http_request_t *r)
546 {
547 size_t size;
548 ssize_t n;
549 u_char buffer[NGX_HTTP_DISCARD_BUFFER_SIZE];
550
551 ngx_log_debug0(NGX_LOG_DEBUG_HTTP, r->connection->log, 0,
552 "http read discarded body");
553
554 do {
555 if (r->headers_in.content_length_n == 0) {
556 r->read_event_handler = ngx_http_block_reading;
557 return NGX_OK;
558 }
559
560 size = (r->headers_in.content_length_n > NGX_HTTP_DISCARD_BUFFER_SIZE) ?
561 NGX_HTTP_DISCARD_BUFFER_SIZE:
562 (size_t) r->headers_in.content_length_n;
563
564 n = r->connection->recv(r->connection, buffer, size);
565
566 if (n == NGX_ERROR) {
567 r->connection->error = 1;
568 return NGX_OK;
569 }
570
571 if (n == NGX_AGAIN) {
572 return NGX_AGAIN;
573 }
574
575 if (n == 0) {
576 return NGX_OK;
577 }
578
579 r->headers_in.content_length_n -= n;
580
581 } while (r->connection->read->ready);
582
583 return NGX_AGAIN;
584 }
585
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