425
|
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 {
|
489
|
13 u_char color;
|
|
14 u_char dummy;
|
|
15 u_short len;
|
|
16 ngx_queue_t queue;
|
|
17 ngx_msec_t last;
|
|
18 /* integer value, 1 corresponds to 0.001 r/s */
|
|
19 ngx_uint_t excess;
|
|
20 u_char data[1];
|
425
|
21 } ngx_http_limit_req_node_t;
|
|
22
|
|
23
|
|
24 typedef struct {
|
489
|
25 ngx_rbtree_t rbtree;
|
|
26 ngx_rbtree_node_t sentinel;
|
|
27 ngx_queue_t queue;
|
|
28 } ngx_http_limit_req_shctx_t;
|
|
29
|
|
30
|
|
31 typedef struct {
|
|
32 ngx_http_limit_req_shctx_t *sh;
|
|
33 ngx_slab_pool_t *shpool;
|
|
34 /* integer value, 1 corresponds to 0.001 r/s */
|
|
35 ngx_uint_t rate;
|
|
36 ngx_int_t index;
|
|
37 ngx_str_t var;
|
425
|
38 } ngx_http_limit_req_ctx_t;
|
|
39
|
|
40
|
|
41 typedef struct {
|
489
|
42 ngx_shm_zone_t *shm_zone;
|
|
43 /* integer value, 1 corresponds to 0.001 r/s */
|
|
44 ngx_uint_t burst;
|
544
|
45 ngx_uint_t limit_log_level;
|
|
46 ngx_uint_t delay_log_level;
|
|
47
|
|
48 ngx_uint_t nodelay; /* unsigned nodelay:1 */
|
425
|
49 } ngx_http_limit_req_conf_t;
|
|
50
|
|
51
|
|
52 static void ngx_http_limit_req_delay(ngx_http_request_t *r);
|
435
|
53 static ngx_int_t ngx_http_limit_req_lookup(ngx_http_limit_req_conf_t *lrcf,
|
|
54 ngx_uint_t hash, u_char *data, size_t len, ngx_http_limit_req_node_t **lrp);
|
425
|
55 static void ngx_http_limit_req_expire(ngx_http_limit_req_ctx_t *ctx,
|
|
56 ngx_uint_t n);
|
|
57
|
|
58 static void *ngx_http_limit_req_create_conf(ngx_conf_t *cf);
|
|
59 static char *ngx_http_limit_req_merge_conf(ngx_conf_t *cf, void *parent,
|
|
60 void *child);
|
|
61 static char *ngx_http_limit_req_zone(ngx_conf_t *cf, ngx_command_t *cmd,
|
|
62 void *conf);
|
|
63 static char *ngx_http_limit_req(ngx_conf_t *cf, ngx_command_t *cmd,
|
|
64 void *conf);
|
|
65 static ngx_int_t ngx_http_limit_req_init(ngx_conf_t *cf);
|
|
66
|
|
67
|
544
|
68 static ngx_conf_enum_t ngx_http_limit_req_log_levels[] = {
|
|
69 { ngx_string("info"), NGX_LOG_INFO },
|
|
70 { ngx_string("notice"), NGX_LOG_NOTICE },
|
|
71 { ngx_string("warn"), NGX_LOG_WARN },
|
|
72 { ngx_string("error"), NGX_LOG_ERR },
|
|
73 { ngx_null_string, 0 }
|
|
74 };
|
|
75
|
|
76
|
425
|
77 static ngx_command_t ngx_http_limit_req_commands[] = {
|
|
78
|
|
79 { ngx_string("limit_req_zone"),
|
|
80 NGX_HTTP_MAIN_CONF|NGX_CONF_TAKE3,
|
|
81 ngx_http_limit_req_zone,
|
|
82 0,
|
|
83 0,
|
|
84 NULL },
|
|
85
|
|
86 { ngx_string("limit_req"),
|
|
87 NGX_HTTP_MAIN_CONF|NGX_HTTP_SRV_CONF|NGX_HTTP_LOC_CONF|NGX_CONF_TAKE123,
|
|
88 ngx_http_limit_req,
|
|
89 NGX_HTTP_LOC_CONF_OFFSET,
|
|
90 0,
|
|
91 NULL },
|
|
92
|
544
|
93 { ngx_string("limit_req_log_level"),
|
|
94 NGX_HTTP_MAIN_CONF|NGX_HTTP_SRV_CONF|NGX_HTTP_LOC_CONF|NGX_CONF_TAKE1,
|
|
95 ngx_conf_set_enum_slot,
|
|
96 NGX_HTTP_LOC_CONF_OFFSET,
|
|
97 offsetof(ngx_http_limit_req_conf_t, limit_log_level),
|
|
98 &ngx_http_limit_req_log_levels },
|
|
99
|
425
|
100 ngx_null_command
|
|
101 };
|
|
102
|
|
103
|
|
104 static ngx_http_module_t ngx_http_limit_req_module_ctx = {
|
|
105 NULL, /* preconfiguration */
|
|
106 ngx_http_limit_req_init, /* postconfiguration */
|
|
107
|
|
108 NULL, /* create main configuration */
|
|
109 NULL, /* init main configuration */
|
|
110
|
|
111 NULL, /* create server configuration */
|
|
112 NULL, /* merge server configuration */
|
|
113
|
|
114 ngx_http_limit_req_create_conf, /* create location configration */
|
|
115 ngx_http_limit_req_merge_conf /* merge location configration */
|
|
116 };
|
|
117
|
|
118
|
|
119 ngx_module_t ngx_http_limit_req_module = {
|
|
120 NGX_MODULE_V1,
|
|
121 &ngx_http_limit_req_module_ctx, /* module context */
|
|
122 ngx_http_limit_req_commands, /* module directives */
|
|
123 NGX_HTTP_MODULE, /* module type */
|
|
124 NULL, /* init master */
|
|
125 NULL, /* init module */
|
|
126 NULL, /* init process */
|
|
127 NULL, /* init thread */
|
|
128 NULL, /* exit thread */
|
|
129 NULL, /* exit process */
|
|
130 NULL, /* exit master */
|
|
131 NGX_MODULE_V1_PADDING
|
|
132 };
|
|
133
|
|
134
|
|
135 static ngx_int_t
|
|
136 ngx_http_limit_req_handler(ngx_http_request_t *r)
|
|
137 {
|
|
138 size_t len, n;
|
|
139 uint32_t hash;
|
|
140 ngx_int_t rc;
|
429
|
141 ngx_uint_t excess;
|
425
|
142 ngx_time_t *tp;
|
|
143 ngx_rbtree_node_t *node;
|
|
144 ngx_http_variable_value_t *vv;
|
|
145 ngx_http_limit_req_ctx_t *ctx;
|
435
|
146 ngx_http_limit_req_node_t *lr;
|
|
147 ngx_http_limit_req_conf_t *lrcf;
|
425
|
148
|
|
149 if (r->main->limit_req_set) {
|
|
150 return NGX_DECLINED;
|
|
151 }
|
|
152
|
435
|
153 lrcf = ngx_http_get_module_loc_conf(r, ngx_http_limit_req_module);
|
425
|
154
|
435
|
155 if (lrcf->shm_zone == NULL) {
|
425
|
156 return NGX_DECLINED;
|
|
157 }
|
|
158
|
435
|
159 ctx = lrcf->shm_zone->data;
|
425
|
160
|
|
161 vv = ngx_http_get_indexed_variable(r, ctx->index);
|
|
162
|
|
163 if (vv == NULL || vv->not_found) {
|
|
164 return NGX_DECLINED;
|
|
165 }
|
|
166
|
|
167 len = vv->len;
|
|
168
|
|
169 if (len == 0) {
|
|
170 return NGX_DECLINED;
|
|
171 }
|
|
172
|
|
173 if (len > 65535) {
|
|
174 ngx_log_error(NGX_LOG_ERR, r->connection->log, 0,
|
|
175 "the value of the \"%V\" variable "
|
|
176 "is more than 65535 bytes: \"%v\"",
|
|
177 &ctx->var, vv);
|
|
178 return NGX_DECLINED;
|
|
179 }
|
|
180
|
|
181 r->main->limit_req_set = 1;
|
|
182
|
|
183 hash = ngx_crc32_short(vv->data, len);
|
|
184
|
|
185 ngx_shmtx_lock(&ctx->shpool->mutex);
|
|
186
|
|
187 ngx_http_limit_req_expire(ctx, 1);
|
|
188
|
435
|
189 rc = ngx_http_limit_req_lookup(lrcf, hash, vv->data, len, &lr);
|
425
|
190
|
435
|
191 if (lr) {
|
|
192 ngx_queue_remove(&lr->queue);
|
425
|
193
|
489
|
194 ngx_queue_insert_head(&ctx->sh->queue, &lr->queue);
|
425
|
195
|
435
|
196 excess = lr->excess;
|
425
|
197
|
|
198 } else {
|
429
|
199 excess = 0;
|
425
|
200 }
|
|
201
|
429
|
202 ngx_log_debug3(NGX_LOG_DEBUG_HTTP, r->connection->log, 0,
|
515
|
203 "limit_req: %i %ui.%03ui", rc, excess / 1000, excess % 1000);
|
425
|
204
|
|
205 if (rc == NGX_BUSY) {
|
|
206 ngx_shmtx_unlock(&ctx->shpool->mutex);
|
|
207
|
544
|
208 ngx_log_error(lrcf->limit_log_level, r->connection->log, 0,
|
435
|
209 "limiting requests, excess: %ui.%03ui by zone \"%V\"",
|
489
|
210 excess / 1000, excess % 1000, &lrcf->shm_zone->shm.name);
|
425
|
211
|
|
212 return NGX_HTTP_SERVICE_UNAVAILABLE;
|
|
213 }
|
|
214
|
|
215 if (rc == NGX_AGAIN) {
|
|
216 ngx_shmtx_unlock(&ctx->shpool->mutex);
|
|
217
|
435
|
218 if (lrcf->nodelay) {
|
427
|
219 return NGX_DECLINED;
|
425
|
220 }
|
|
221
|
544
|
222 ngx_log_error(lrcf->delay_log_level, r->connection->log, 0,
|
435
|
223 "delaying request, excess: %ui.%03ui, by zone \"%V\"",
|
489
|
224 excess / 1000, excess % 1000, &lrcf->shm_zone->shm.name);
|
427
|
225
|
|
226 if (ngx_handle_read_event(r->connection->read, 0) != NGX_OK) {
|
|
227 return NGX_HTTP_INTERNAL_SERVER_ERROR;
|
|
228 }
|
|
229
|
|
230 r->read_event_handler = ngx_http_test_reading;
|
|
231 r->write_event_handler = ngx_http_limit_req_delay;
|
585
|
232 ngx_add_timer(r->connection->write,
|
|
233 (ngx_msec_t) excess * 1000 / ctx->rate);
|
427
|
234
|
|
235 return NGX_AGAIN;
|
425
|
236 }
|
|
237
|
|
238 if (rc == NGX_OK) {
|
|
239 goto done;
|
|
240 }
|
|
241
|
|
242 /* rc == NGX_DECLINED */
|
|
243
|
|
244 n = offsetof(ngx_rbtree_node_t, color)
|
|
245 + offsetof(ngx_http_limit_req_node_t, data)
|
|
246 + len;
|
|
247
|
|
248 node = ngx_slab_alloc_locked(ctx->shpool, n);
|
|
249 if (node == NULL) {
|
|
250
|
|
251 ngx_http_limit_req_expire(ctx, 0);
|
|
252
|
|
253 node = ngx_slab_alloc_locked(ctx->shpool, n);
|
|
254 if (node == NULL) {
|
|
255 ngx_shmtx_unlock(&ctx->shpool->mutex);
|
|
256 return NGX_HTTP_SERVICE_UNAVAILABLE;
|
|
257 }
|
|
258 }
|
|
259
|
435
|
260 lr = (ngx_http_limit_req_node_t *) &node->color;
|
425
|
261
|
|
262 node->key = hash;
|
435
|
263 lr->len = (u_char) len;
|
425
|
264
|
|
265 tp = ngx_timeofday();
|
435
|
266 lr->last = (ngx_msec_t) (tp->sec * 1000 + tp->msec);
|
425
|
267
|
435
|
268 lr->excess = 0;
|
|
269 ngx_memcpy(lr->data, vv->data, len);
|
425
|
270
|
489
|
271 ngx_rbtree_insert(&ctx->sh->rbtree, node);
|
425
|
272
|
489
|
273 ngx_queue_insert_head(&ctx->sh->queue, &lr->queue);
|
425
|
274
|
|
275 done:
|
|
276
|
|
277 ngx_shmtx_unlock(&ctx->shpool->mutex);
|
|
278
|
|
279 return NGX_DECLINED;
|
|
280 }
|
|
281
|
|
282
|
|
283 static void
|
|
284 ngx_http_limit_req_delay(ngx_http_request_t *r)
|
|
285 {
|
515
|
286 ngx_event_t *wev;
|
|
287
|
425
|
288 ngx_log_debug0(NGX_LOG_DEBUG_HTTP, r->connection->log, 0,
|
515
|
289 "limit_req delay");
|
|
290
|
|
291 wev = r->connection->write;
|
|
292
|
|
293 if (!wev->timedout) {
|
|
294
|
|
295 if (ngx_handle_write_event(wev, 0) != NGX_OK) {
|
|
296 ngx_http_finalize_request(r, NGX_HTTP_INTERNAL_SERVER_ERROR);
|
|
297 }
|
|
298
|
|
299 return;
|
|
300 }
|
|
301
|
|
302 wev->timedout = 0;
|
425
|
303
|
|
304 if (ngx_handle_read_event(r->connection->read, 0) != NGX_OK) {
|
|
305 ngx_http_finalize_request(r, NGX_HTTP_INTERNAL_SERVER_ERROR);
|
|
306 return;
|
|
307 }
|
|
308
|
|
309 r->read_event_handler = ngx_http_block_reading;
|
|
310 r->write_event_handler = ngx_http_core_run_phases;
|
|
311
|
|
312 ngx_http_core_run_phases(r);
|
|
313 }
|
|
314
|
|
315
|
|
316 static void
|
|
317 ngx_http_limit_req_rbtree_insert_value(ngx_rbtree_node_t *temp,
|
|
318 ngx_rbtree_node_t *node, ngx_rbtree_node_t *sentinel)
|
|
319 {
|
|
320 ngx_rbtree_node_t **p;
|
435
|
321 ngx_http_limit_req_node_t *lrn, *lrnt;
|
425
|
322
|
|
323 for ( ;; ) {
|
|
324
|
|
325 if (node->key < temp->key) {
|
|
326
|
|
327 p = &temp->left;
|
|
328
|
|
329 } else if (node->key > temp->key) {
|
|
330
|
|
331 p = &temp->right;
|
|
332
|
|
333 } else { /* node->key == temp->key */
|
|
334
|
435
|
335 lrn = (ngx_http_limit_req_node_t *) &node->color;
|
|
336 lrnt = (ngx_http_limit_req_node_t *) &temp->color;
|
425
|
337
|
435
|
338 p = (ngx_memn2cmp(lrn->data, lrnt->data, lrn->len, lrnt->len) < 0)
|
425
|
339 ? &temp->left : &temp->right;
|
|
340 }
|
|
341
|
|
342 if (*p == sentinel) {
|
|
343 break;
|
|
344 }
|
|
345
|
|
346 temp = *p;
|
|
347 }
|
|
348
|
|
349 *p = node;
|
|
350 node->parent = temp;
|
|
351 node->left = sentinel;
|
|
352 node->right = sentinel;
|
|
353 ngx_rbt_red(node);
|
|
354 }
|
|
355
|
|
356
|
|
357 static ngx_int_t
|
435
|
358 ngx_http_limit_req_lookup(ngx_http_limit_req_conf_t *lrcf, ngx_uint_t hash,
|
|
359 u_char *data, size_t len, ngx_http_limit_req_node_t **lrp)
|
425
|
360 {
|
429
|
361 ngx_int_t rc, excess;
|
425
|
362 ngx_time_t *tp;
|
|
363 ngx_msec_t now;
|
|
364 ngx_msec_int_t ms;
|
|
365 ngx_rbtree_node_t *node, *sentinel;
|
|
366 ngx_http_limit_req_ctx_t *ctx;
|
435
|
367 ngx_http_limit_req_node_t *lr;
|
425
|
368
|
435
|
369 ctx = lrcf->shm_zone->data;
|
425
|
370
|
489
|
371 node = ctx->sh->rbtree.root;
|
|
372 sentinel = ctx->sh->rbtree.sentinel;
|
425
|
373
|
|
374 while (node != sentinel) {
|
|
375
|
|
376 if (hash < node->key) {
|
|
377 node = node->left;
|
|
378 continue;
|
|
379 }
|
|
380
|
|
381 if (hash > node->key) {
|
|
382 node = node->right;
|
|
383 continue;
|
|
384 }
|
|
385
|
|
386 /* hash == node->key */
|
|
387
|
|
388 do {
|
435
|
389 lr = (ngx_http_limit_req_node_t *) &node->color;
|
425
|
390
|
435
|
391 rc = ngx_memn2cmp(data, lr->data, len, (size_t) lr->len);
|
425
|
392
|
|
393 if (rc == 0) {
|
|
394
|
|
395 tp = ngx_timeofday();
|
|
396
|
|
397 now = (ngx_msec_t) (tp->sec * 1000 + tp->msec);
|
435
|
398 ms = (ngx_msec_int_t) (now - lr->last);
|
425
|
399
|
435
|
400 excess = lr->excess - ctx->rate * ngx_abs(ms) / 1000 + 1000;
|
425
|
401
|
546
|
402 if (excess < 0) {
|
|
403 excess = 0;
|
|
404 }
|
|
405
|
544
|
406 if ((ngx_uint_t) excess > lrcf->burst) {
|
|
407 *lrp = lr;
|
|
408 return NGX_BUSY;
|
|
409 }
|
|
410
|
435
|
411 lr->excess = excess;
|
|
412 lr->last = now;
|
425
|
413
|
435
|
414 *lrp = lr;
|
425
|
415
|
429
|
416 if (excess) {
|
425
|
417 return NGX_AGAIN;
|
|
418 }
|
|
419
|
|
420 return NGX_OK;
|
|
421 }
|
|
422
|
|
423 node = (rc < 0) ? node->left : node->right;
|
|
424
|
|
425 } while (node != sentinel && hash == node->key);
|
|
426
|
|
427 break;
|
|
428 }
|
|
429
|
435
|
430 *lrp = NULL;
|
425
|
431
|
|
432 return NGX_DECLINED;
|
|
433 }
|
|
434
|
|
435
|
|
436 static void
|
|
437 ngx_http_limit_req_expire(ngx_http_limit_req_ctx_t *ctx, ngx_uint_t n)
|
|
438 {
|
429
|
439 ngx_int_t excess;
|
425
|
440 ngx_time_t *tp;
|
|
441 ngx_msec_t now;
|
|
442 ngx_queue_t *q;
|
|
443 ngx_msec_int_t ms;
|
|
444 ngx_rbtree_node_t *node;
|
435
|
445 ngx_http_limit_req_node_t *lr;
|
425
|
446
|
|
447 tp = ngx_timeofday();
|
|
448
|
|
449 now = (ngx_msec_t) (tp->sec * 1000 + tp->msec);
|
|
450
|
|
451 /*
|
|
452 * n == 1 deletes one or two zero rate entries
|
|
453 * n == 0 deletes oldest entry by force
|
|
454 * and one or two zero rate entries
|
|
455 */
|
|
456
|
|
457 while (n < 3) {
|
|
458
|
489
|
459 if (ngx_queue_empty(&ctx->sh->queue)) {
|
425
|
460 return;
|
|
461 }
|
|
462
|
489
|
463 q = ngx_queue_last(&ctx->sh->queue);
|
425
|
464
|
435
|
465 lr = ngx_queue_data(q, ngx_http_limit_req_node_t, queue);
|
425
|
466
|
|
467 if (n++ != 0) {
|
|
468
|
435
|
469 ms = (ngx_msec_int_t) (now - lr->last);
|
425
|
470 ms = ngx_abs(ms);
|
|
471
|
|
472 if (ms < 60000) {
|
|
473 return;
|
|
474 }
|
|
475
|
435
|
476 excess = lr->excess - ctx->rate * ms / 1000;
|
425
|
477
|
429
|
478 if (excess > 0) {
|
425
|
479 return;
|
|
480 }
|
|
481 }
|
|
482
|
|
483 ngx_queue_remove(q);
|
|
484
|
|
485 node = (ngx_rbtree_node_t *)
|
435
|
486 ((u_char *) lr - offsetof(ngx_rbtree_node_t, color));
|
425
|
487
|
489
|
488 ngx_rbtree_delete(&ctx->sh->rbtree, node);
|
425
|
489
|
|
490 ngx_slab_free_locked(ctx->shpool, node);
|
|
491 }
|
|
492 }
|
|
493
|
|
494
|
|
495 static ngx_int_t
|
|
496 ngx_http_limit_req_init_zone(ngx_shm_zone_t *shm_zone, void *data)
|
|
497 {
|
|
498 ngx_http_limit_req_ctx_t *octx = data;
|
|
499
|
477
|
500 size_t len;
|
425
|
501 ngx_http_limit_req_ctx_t *ctx;
|
|
502
|
|
503 ctx = shm_zone->data;
|
|
504
|
|
505 if (octx) {
|
|
506 if (ngx_strcmp(ctx->var.data, octx->var.data) != 0) {
|
|
507 ngx_log_error(NGX_LOG_EMERG, shm_zone->shm.log, 0,
|
|
508 "limit_req \"%V\" uses the \"%V\" variable "
|
|
509 "while previously it used the \"%V\" variable",
|
489
|
510 &shm_zone->shm.name, &ctx->var, &octx->var);
|
425
|
511 return NGX_ERROR;
|
|
512 }
|
|
513
|
489
|
514 ctx->sh = octx->sh;
|
425
|
515 ctx->shpool = octx->shpool;
|
|
516
|
|
517 return NGX_OK;
|
|
518 }
|
|
519
|
|
520 ctx->shpool = (ngx_slab_pool_t *) shm_zone->shm.addr;
|
|
521
|
489
|
522 if (shm_zone->shm.exists) {
|
|
523 ctx->sh = ctx->shpool->data;
|
|
524
|
|
525 return NGX_OK;
|
425
|
526 }
|
|
527
|
489
|
528 ctx->sh = ngx_slab_alloc(ctx->shpool, sizeof(ngx_http_limit_req_shctx_t));
|
|
529 if (ctx->sh == NULL) {
|
425
|
530 return NGX_ERROR;
|
|
531 }
|
|
532
|
489
|
533 ctx->shpool->data = ctx->sh;
|
|
534
|
|
535 ngx_rbtree_init(&ctx->sh->rbtree, &ctx->sh->sentinel,
|
425
|
536 ngx_http_limit_req_rbtree_insert_value);
|
|
537
|
489
|
538 ngx_queue_init(&ctx->sh->queue);
|
425
|
539
|
489
|
540 len = sizeof(" in limit_req zone \"\"") + shm_zone->shm.name.len;
|
477
|
541
|
|
542 ctx->shpool->log_ctx = ngx_slab_alloc(ctx->shpool, len);
|
|
543 if (ctx->shpool->log_ctx == NULL) {
|
|
544 return NGX_ERROR;
|
|
545 }
|
|
546
|
|
547 ngx_sprintf(ctx->shpool->log_ctx, " in limit_req zone \"%V\"%Z",
|
489
|
548 &shm_zone->shm.name);
|
477
|
549
|
425
|
550 return NGX_OK;
|
|
551 }
|
|
552
|
|
553
|
|
554 static void *
|
|
555 ngx_http_limit_req_create_conf(ngx_conf_t *cf)
|
|
556 {
|
|
557 ngx_http_limit_req_conf_t *conf;
|
|
558
|
|
559 conf = ngx_pcalloc(cf->pool, sizeof(ngx_http_limit_req_conf_t));
|
|
560 if (conf == NULL) {
|
505
|
561 return NULL;
|
425
|
562 }
|
|
563
|
|
564 /*
|
|
565 * set by ngx_pcalloc():
|
|
566 *
|
|
567 * conf->shm_zone = NULL;
|
435
|
568 * conf->burst = 0;
|
427
|
569 * conf->nodelay = 0;
|
425
|
570 */
|
|
571
|
544
|
572 conf->limit_log_level = NGX_CONF_UNSET_UINT;
|
|
573
|
425
|
574 return conf;
|
|
575 }
|
|
576
|
|
577
|
|
578 static char *
|
|
579 ngx_http_limit_req_merge_conf(ngx_conf_t *cf, void *parent, void *child)
|
|
580 {
|
|
581 ngx_http_limit_req_conf_t *prev = parent;
|
|
582 ngx_http_limit_req_conf_t *conf = child;
|
|
583
|
|
584 if (conf->shm_zone == NULL) {
|
|
585 *conf = *prev;
|
|
586 }
|
|
587
|
544
|
588 ngx_conf_merge_uint_value(conf->limit_log_level, prev->limit_log_level,
|
|
589 NGX_LOG_ERR);
|
|
590
|
|
591 conf->delay_log_level = (conf->limit_log_level == NGX_LOG_INFO) ?
|
|
592 NGX_LOG_INFO : conf->limit_log_level + 1;
|
|
593
|
425
|
594 return NGX_CONF_OK;
|
|
595 }
|
|
596
|
|
597
|
|
598 static char *
|
|
599 ngx_http_limit_req_zone(ngx_conf_t *cf, ngx_command_t *cmd, void *conf)
|
|
600 {
|
|
601 u_char *p;
|
|
602 size_t size, len;
|
|
603 ngx_str_t *value, name, s;
|
|
604 ngx_int_t rate, scale;
|
|
605 ngx_uint_t i;
|
|
606 ngx_shm_zone_t *shm_zone;
|
|
607 ngx_http_limit_req_ctx_t *ctx;
|
|
608
|
|
609 value = cf->args->elts;
|
|
610
|
|
611 ctx = NULL;
|
|
612 size = 0;
|
|
613 rate = 1;
|
|
614 scale = 1;
|
|
615 name.len = 0;
|
|
616
|
|
617 for (i = 1; i < cf->args->nelts; i++) {
|
|
618
|
|
619 if (ngx_strncmp(value[i].data, "zone=", 5) == 0) {
|
|
620
|
|
621 name.data = value[i].data + 5;
|
|
622
|
|
623 p = (u_char *) ngx_strchr(name.data, ':');
|
|
624
|
|
625 if (p) {
|
489
|
626 *p = '\0';
|
|
627
|
425
|
628 name.len = p - name.data;
|
|
629
|
|
630 p++;
|
|
631
|
|
632 s.len = value[i].data + value[i].len - p;
|
|
633 s.data = p;
|
|
634
|
|
635 size = ngx_parse_size(&s);
|
|
636 if (size > 8191) {
|
|
637 continue;
|
|
638 }
|
|
639 }
|
|
640
|
|
641 ngx_conf_log_error(NGX_LOG_EMERG, cf, 0,
|
|
642 "invalid zone size \"%V\"", &value[i]);
|
|
643 return NGX_CONF_ERROR;
|
|
644 }
|
|
645
|
|
646 if (ngx_strncmp(value[i].data, "rate=", 5) == 0) {
|
|
647
|
|
648 len = value[i].len;
|
|
649 p = value[i].data + len - 3;
|
|
650
|
|
651 if (ngx_strncmp(p, "r/s", 3) == 0) {
|
|
652 scale = 1;
|
|
653 len -= 3;
|
|
654
|
|
655 } else if (ngx_strncmp(p, "r/m", 3) == 0) {
|
|
656 scale = 60;
|
|
657 len -= 3;
|
|
658 }
|
|
659
|
|
660 rate = ngx_atoi(value[i].data + 5, len - 5);
|
|
661 if (rate <= NGX_ERROR) {
|
|
662 ngx_conf_log_error(NGX_LOG_EMERG, cf, 0,
|
|
663 "invalid rate \"%V\"", &value[i]);
|
|
664 return NGX_CONF_ERROR;
|
|
665 }
|
|
666
|
|
667 continue;
|
|
668 }
|
|
669
|
|
670 if (value[i].data[0] == '$') {
|
|
671
|
|
672 value[i].len--;
|
|
673 value[i].data++;
|
|
674
|
|
675 ctx = ngx_pcalloc(cf->pool, sizeof(ngx_http_limit_req_ctx_t));
|
|
676 if (ctx == NULL) {
|
|
677 return NGX_CONF_ERROR;
|
|
678 }
|
|
679
|
|
680 ctx->index = ngx_http_get_variable_index(cf, &value[i]);
|
|
681 if (ctx->index == NGX_ERROR) {
|
|
682 return NGX_CONF_ERROR;
|
|
683 }
|
|
684
|
|
685 ctx->var = value[i];
|
|
686
|
|
687 continue;
|
|
688 }
|
|
689
|
|
690 ngx_conf_log_error(NGX_LOG_EMERG, cf, 0,
|
|
691 "invalid parameter \"%V\"", &value[i]);
|
|
692 return NGX_CONF_ERROR;
|
|
693 }
|
|
694
|
|
695 if (name.len == 0 || size == 0) {
|
|
696 ngx_conf_log_error(NGX_LOG_EMERG, cf, 0,
|
|
697 "\"%V\" must have \"zone\" parameter",
|
|
698 &cmd->name);
|
|
699 return NGX_CONF_ERROR;
|
|
700 }
|
|
701
|
|
702 if (ctx == NULL) {
|
|
703 ngx_conf_log_error(NGX_LOG_EMERG, cf, 0,
|
|
704 "no variable is defined for limit_req_zone \"%V\"",
|
|
705 &cmd->name);
|
|
706 return NGX_CONF_ERROR;
|
|
707 }
|
|
708
|
429
|
709 ctx->rate = rate * 1000 / scale;
|
425
|
710
|
|
711 shm_zone = ngx_shared_memory_add(cf, &name, size,
|
|
712 &ngx_http_limit_req_module);
|
|
713 if (shm_zone == NULL) {
|
|
714 return NGX_CONF_ERROR;
|
|
715 }
|
|
716
|
|
717 if (shm_zone->data) {
|
|
718 ctx = shm_zone->data;
|
|
719
|
|
720 ngx_conf_log_error(NGX_LOG_EMERG, cf, 0,
|
|
721 "limit_req_zone \"%V\" is already bound to variable \"%V\"",
|
|
722 &value[1], &ctx->var);
|
|
723 return NGX_CONF_ERROR;
|
|
724 }
|
|
725
|
|
726 shm_zone->init = ngx_http_limit_req_init_zone;
|
|
727 shm_zone->data = ctx;
|
|
728
|
|
729 return NGX_CONF_OK;
|
|
730 }
|
|
731
|
|
732
|
|
733 static char *
|
|
734 ngx_http_limit_req(ngx_conf_t *cf, ngx_command_t *cmd, void *conf)
|
|
735 {
|
435
|
736 ngx_http_limit_req_conf_t *lrcf = conf;
|
425
|
737
|
427
|
738 ngx_int_t burst;
|
|
739 ngx_str_t *value, s;
|
|
740 ngx_uint_t i;
|
425
|
741
|
435
|
742 if (lrcf->shm_zone) {
|
425
|
743 return "is duplicate";
|
|
744 }
|
|
745
|
|
746 value = cf->args->elts;
|
|
747
|
|
748 burst = 0;
|
|
749
|
|
750 for (i = 1; i < cf->args->nelts; i++) {
|
|
751
|
|
752 if (ngx_strncmp(value[i].data, "zone=", 5) == 0) {
|
|
753
|
|
754 s.len = value[i].len - 5;
|
|
755 s.data = value[i].data + 5;
|
|
756
|
435
|
757 lrcf->shm_zone = ngx_shared_memory_add(cf, &s, 0,
|
425
|
758 &ngx_http_limit_req_module);
|
435
|
759 if (lrcf->shm_zone == NULL) {
|
425
|
760 return NGX_CONF_ERROR;
|
|
761 }
|
|
762
|
|
763 continue;
|
|
764 }
|
|
765
|
|
766 if (ngx_strncmp(value[i].data, "burst=", 6) == 0) {
|
|
767
|
427
|
768 burst = ngx_atoi(value[i].data + 6, value[i].len - 6);
|
425
|
769 if (burst <= 0) {
|
|
770 ngx_conf_log_error(NGX_LOG_EMERG, cf, 0,
|
|
771 "invalid burst rate \"%V\"", &value[i]);
|
|
772 return NGX_CONF_ERROR;
|
|
773 }
|
|
774
|
|
775 continue;
|
|
776 }
|
|
777
|
427
|
778 if (ngx_strncmp(value[i].data, "nodelay", 7) == 0) {
|
435
|
779 lrcf->nodelay = 1;
|
425
|
780 continue;
|
|
781 }
|
|
782
|
|
783 ngx_conf_log_error(NGX_LOG_EMERG, cf, 0,
|
|
784 "invalid parameter \"%V\"", &value[i]);
|
|
785 return NGX_CONF_ERROR;
|
|
786 }
|
|
787
|
435
|
788 if (lrcf->shm_zone == NULL) {
|
425
|
789 ngx_conf_log_error(NGX_LOG_EMERG, cf, 0,
|
|
790 "\"%V\" must have \"zone\" parameter",
|
|
791 &cmd->name);
|
|
792 return NGX_CONF_ERROR;
|
|
793 }
|
|
794
|
435
|
795 if (lrcf->shm_zone->data == NULL) {
|
425
|
796 ngx_conf_log_error(NGX_LOG_EMERG, cf, 0,
|
|
797 "unknown limit_req_zone \"%V\"",
|
489
|
798 &lrcf->shm_zone->shm.name);
|
425
|
799 return NGX_CONF_ERROR;
|
|
800 }
|
|
801
|
435
|
802 lrcf->burst = burst * 1000;
|
425
|
803
|
|
804 return NGX_CONF_OK;
|
|
805 }
|
|
806
|
|
807
|
|
808 static ngx_int_t
|
|
809 ngx_http_limit_req_init(ngx_conf_t *cf)
|
|
810 {
|
|
811 ngx_http_handler_pt *h;
|
|
812 ngx_http_core_main_conf_t *cmcf;
|
|
813
|
|
814 cmcf = ngx_http_conf_get_module_main_conf(cf, ngx_http_core_module);
|
|
815
|
|
816 h = ngx_array_push(&cmcf->phases[NGX_HTTP_PREACCESS_PHASE].handlers);
|
|
817 if (h == NULL) {
|
|
818 return NGX_ERROR;
|
|
819 }
|
|
820
|
|
821 *h = ngx_http_limit_req_handler;
|
|
822
|
|
823 return NGX_OK;
|
|
824 }
|