|
272
|
1
|
|
|
2 /*
|
|
|
3 * Copyright (C) Igor Sysoev
|
|
644
|
4 * Copyright (C) Nginx, Inc.
|
|
272
|
5 */
|
|
|
6
|
|
|
7
|
|
|
8 #include <ngx_config.h>
|
|
|
9 #include <ngx_core.h>
|
|
|
10 #include <ngx_http.h>
|
|
|
11
|
|
|
12
|
|
|
13 typedef struct {
|
|
|
14 u_char color;
|
|
|
15 u_char len;
|
|
|
16 u_short conn;
|
|
|
17 u_char data[1];
|
|
|
18 } ngx_http_limit_zone_node_t;
|
|
|
19
|
|
|
20
|
|
|
21 typedef struct {
|
|
|
22 ngx_shm_zone_t *shm_zone;
|
|
|
23 ngx_rbtree_node_t *node;
|
|
|
24 } ngx_http_limit_zone_cleanup_t;
|
|
|
25
|
|
|
26
|
|
|
27 typedef struct {
|
|
|
28 ngx_rbtree_t *rbtree;
|
|
|
29 ngx_int_t index;
|
|
|
30 ngx_str_t var;
|
|
|
31 } ngx_http_limit_zone_ctx_t;
|
|
|
32
|
|
|
33
|
|
|
34 typedef struct {
|
|
|
35 ngx_shm_zone_t *shm_zone;
|
|
|
36 ngx_uint_t conn;
|
|
532
|
37 ngx_uint_t log_level;
|
|
272
|
38 } ngx_http_limit_zone_conf_t;
|
|
|
39
|
|
|
40
|
|
|
41 static void ngx_http_limit_zone_cleanup(void *data);
|
|
|
42
|
|
|
43 static void *ngx_http_limit_zone_create_conf(ngx_conf_t *cf);
|
|
|
44 static char *ngx_http_limit_zone_merge_conf(ngx_conf_t *cf, void *parent,
|
|
|
45 void *child);
|
|
|
46 static char *ngx_http_limit_zone(ngx_conf_t *cf, ngx_command_t *cmd,
|
|
|
47 void *conf);
|
|
|
48 static char *ngx_http_limit_conn(ngx_conf_t *cf, ngx_command_t *cmd,
|
|
|
49 void *conf);
|
|
|
50 static ngx_int_t ngx_http_limit_zone_init(ngx_conf_t *cf);
|
|
|
51
|
|
|
52
|
|
532
|
53 static ngx_conf_enum_t ngx_http_limit_conn_log_levels[] = {
|
|
|
54 { ngx_string("info"), NGX_LOG_INFO },
|
|
|
55 { ngx_string("notice"), NGX_LOG_NOTICE },
|
|
|
56 { ngx_string("warn"), NGX_LOG_WARN },
|
|
|
57 { ngx_string("error"), NGX_LOG_ERR },
|
|
|
58 { ngx_null_string, 0 }
|
|
|
59 };
|
|
|
60
|
|
|
61
|
|
272
|
62 static ngx_command_t ngx_http_limit_zone_commands[] = {
|
|
|
63
|
|
|
64 { ngx_string("limit_zone"),
|
|
|
65 NGX_HTTP_MAIN_CONF|NGX_CONF_TAKE3,
|
|
|
66 ngx_http_limit_zone,
|
|
|
67 0,
|
|
|
68 0,
|
|
|
69 NULL },
|
|
|
70
|
|
|
71 { ngx_string("limit_conn"),
|
|
|
72 NGX_HTTP_MAIN_CONF|NGX_HTTP_SRV_CONF|NGX_HTTP_LOC_CONF|NGX_CONF_TAKE2,
|
|
|
73 ngx_http_limit_conn,
|
|
|
74 NGX_HTTP_LOC_CONF_OFFSET,
|
|
|
75 0,
|
|
|
76 NULL },
|
|
|
77
|
|
532
|
78 { ngx_string("limit_conn_log_level"),
|
|
|
79 NGX_HTTP_MAIN_CONF|NGX_HTTP_SRV_CONF|NGX_HTTP_LOC_CONF|NGX_CONF_TAKE1,
|
|
|
80 ngx_conf_set_enum_slot,
|
|
|
81 NGX_HTTP_LOC_CONF_OFFSET,
|
|
|
82 offsetof(ngx_http_limit_zone_conf_t, log_level),
|
|
|
83 &ngx_http_limit_conn_log_levels },
|
|
|
84
|
|
272
|
85 ngx_null_command
|
|
|
86 };
|
|
|
87
|
|
|
88
|
|
|
89 static ngx_http_module_t ngx_http_limit_zone_module_ctx = {
|
|
|
90 NULL, /* preconfiguration */
|
|
|
91 ngx_http_limit_zone_init, /* postconfiguration */
|
|
|
92
|
|
|
93 NULL, /* create main configuration */
|
|
|
94 NULL, /* init main configuration */
|
|
|
95
|
|
|
96 NULL, /* create server configuration */
|
|
|
97 NULL, /* merge server configuration */
|
|
|
98
|
|
646
|
99 ngx_http_limit_zone_create_conf, /* create location configuration */
|
|
|
100 ngx_http_limit_zone_merge_conf /* merge location configuration */
|
|
272
|
101 };
|
|
|
102
|
|
|
103
|
|
|
104 ngx_module_t ngx_http_limit_zone_module = {
|
|
|
105 NGX_MODULE_V1,
|
|
|
106 &ngx_http_limit_zone_module_ctx, /* module context */
|
|
|
107 ngx_http_limit_zone_commands, /* module directives */
|
|
|
108 NGX_HTTP_MODULE, /* module type */
|
|
|
109 NULL, /* init master */
|
|
|
110 NULL, /* init module */
|
|
|
111 NULL, /* init process */
|
|
|
112 NULL, /* init thread */
|
|
|
113 NULL, /* exit thread */
|
|
|
114 NULL, /* exit process */
|
|
|
115 NULL, /* exit master */
|
|
|
116 NGX_MODULE_V1_PADDING
|
|
|
117 };
|
|
|
118
|
|
|
119
|
|
|
120 static ngx_int_t
|
|
|
121 ngx_http_limit_zone_handler(ngx_http_request_t *r)
|
|
|
122 {
|
|
|
123 size_t len, n;
|
|
|
124 uint32_t hash;
|
|
274
|
125 ngx_int_t rc;
|
|
272
|
126 ngx_slab_pool_t *shpool;
|
|
|
127 ngx_rbtree_node_t *node, *sentinel;
|
|
|
128 ngx_pool_cleanup_t *cln;
|
|
|
129 ngx_http_variable_value_t *vv;
|
|
|
130 ngx_http_limit_zone_ctx_t *ctx;
|
|
|
131 ngx_http_limit_zone_node_t *lz;
|
|
|
132 ngx_http_limit_zone_conf_t *lzcf;
|
|
|
133 ngx_http_limit_zone_cleanup_t *lzcln;
|
|
|
134
|
|
|
135 if (r->main->limit_zone_set) {
|
|
|
136 return NGX_DECLINED;
|
|
|
137 }
|
|
|
138
|
|
|
139 lzcf = ngx_http_get_module_loc_conf(r, ngx_http_limit_zone_module);
|
|
|
140
|
|
|
141 if (lzcf->shm_zone == NULL) {
|
|
|
142 return NGX_DECLINED;
|
|
|
143 }
|
|
|
144
|
|
|
145 ctx = lzcf->shm_zone->data;
|
|
|
146
|
|
|
147 vv = ngx_http_get_indexed_variable(r, ctx->index);
|
|
|
148
|
|
|
149 if (vv == NULL || vv->not_found) {
|
|
|
150 return NGX_DECLINED;
|
|
|
151 }
|
|
|
152
|
|
274
|
153 len = vv->len;
|
|
|
154
|
|
|
155 if (len == 0) {
|
|
|
156 return NGX_DECLINED;
|
|
|
157 }
|
|
272
|
158
|
|
274
|
159 if (len > 255) {
|
|
|
160 ngx_log_error(NGX_LOG_ERR, r->connection->log, 0,
|
|
|
161 "the value of the \"%V\" variable "
|
|
328
|
162 "is more than 255 bytes: \"%v\"",
|
|
274
|
163 &ctx->var, vv);
|
|
|
164 return NGX_DECLINED;
|
|
|
165 }
|
|
|
166
|
|
|
167 r->main->limit_zone_set = 1;
|
|
272
|
168
|
|
|
169 hash = ngx_crc32_short(vv->data, len);
|
|
|
170
|
|
|
171 cln = ngx_pool_cleanup_add(r->pool, sizeof(ngx_http_limit_zone_cleanup_t));
|
|
|
172 if (cln == NULL) {
|
|
|
173 return NGX_HTTP_INTERNAL_SERVER_ERROR;
|
|
|
174 }
|
|
|
175
|
|
|
176 shpool = (ngx_slab_pool_t *) lzcf->shm_zone->shm.addr;
|
|
|
177
|
|
|
178 ngx_shmtx_lock(&shpool->mutex);
|
|
|
179
|
|
|
180 node = ctx->rbtree->root;
|
|
|
181 sentinel = ctx->rbtree->sentinel;
|
|
|
182
|
|
|
183 while (node != sentinel) {
|
|
|
184
|
|
|
185 if (hash < node->key) {
|
|
|
186 node = node->left;
|
|
|
187 continue;
|
|
|
188 }
|
|
|
189
|
|
|
190 if (hash > node->key) {
|
|
|
191 node = node->right;
|
|
|
192 continue;
|
|
|
193 }
|
|
|
194
|
|
274
|
195 /* hash == node->key */
|
|
|
196
|
|
646
|
197 lz = (ngx_http_limit_zone_node_t *) &node->color;
|
|
272
|
198
|
|
646
|
199 rc = ngx_memn2cmp(vv->data, lz->data, len, (size_t) lz->len);
|
|
274
|
200
|
|
646
|
201 if (rc == 0) {
|
|
|
202 if ((ngx_uint_t) lz->conn < lzcf->conn) {
|
|
|
203 lz->conn++;
|
|
|
204 goto done;
|
|
272
|
205 }
|
|
274
|
206
|
|
646
|
207 ngx_shmtx_unlock(&shpool->mutex);
|
|
274
|
208
|
|
646
|
209 ngx_log_error(lzcf->log_level, r->connection->log, 0,
|
|
|
210 "limiting connections by zone \"%V\"",
|
|
|
211 &lzcf->shm_zone->shm.name);
|
|
274
|
212
|
|
646
|
213 return NGX_HTTP_SERVICE_UNAVAILABLE;
|
|
|
214 }
|
|
|
215
|
|
|
216 node = (rc < 0) ? node->left : node->right;
|
|
272
|
217 }
|
|
|
218
|
|
|
219 n = offsetof(ngx_rbtree_node_t, color)
|
|
|
220 + offsetof(ngx_http_limit_zone_node_t, data)
|
|
|
221 + len;
|
|
|
222
|
|
|
223 node = ngx_slab_alloc_locked(shpool, n);
|
|
|
224 if (node == NULL) {
|
|
|
225 ngx_shmtx_unlock(&shpool->mutex);
|
|
|
226 return NGX_HTTP_SERVICE_UNAVAILABLE;
|
|
|
227 }
|
|
|
228
|
|
|
229 lz = (ngx_http_limit_zone_node_t *) &node->color;
|
|
|
230
|
|
|
231 node->key = hash;
|
|
|
232 lz->len = (u_char) len;
|
|
|
233 lz->conn = 1;
|
|
|
234 ngx_memcpy(lz->data, vv->data, len);
|
|
|
235
|
|
|
236 ngx_rbtree_insert(ctx->rbtree, node);
|
|
|
237
|
|
|
238 done:
|
|
|
239
|
|
|
240 ngx_log_debug2(NGX_LOG_DEBUG_HTTP, r->connection->log, 0,
|
|
|
241 "limit zone: %08XD %d", node->key, lz->conn);
|
|
|
242
|
|
|
243 ngx_shmtx_unlock(&shpool->mutex);
|
|
|
244
|
|
|
245 cln->handler = ngx_http_limit_zone_cleanup;
|
|
|
246 lzcln = cln->data;
|
|
|
247
|
|
|
248 lzcln->shm_zone = lzcf->shm_zone;
|
|
|
249 lzcln->node = node;
|
|
|
250
|
|
|
251 return NGX_DECLINED;
|
|
|
252 }
|
|
|
253
|
|
|
254
|
|
|
255 static void
|
|
274
|
256 ngx_http_limit_zone_rbtree_insert_value(ngx_rbtree_node_t *temp,
|
|
|
257 ngx_rbtree_node_t *node, ngx_rbtree_node_t *sentinel)
|
|
|
258 {
|
|
356
|
259 ngx_rbtree_node_t **p;
|
|
|
260 ngx_http_limit_zone_node_t *lzn, *lznt;
|
|
274
|
261
|
|
|
262 for ( ;; ) {
|
|
|
263
|
|
|
264 if (node->key < temp->key) {
|
|
|
265
|
|
356
|
266 p = &temp->left;
|
|
274
|
267
|
|
|
268 } else if (node->key > temp->key) {
|
|
|
269
|
|
356
|
270 p = &temp->right;
|
|
274
|
271
|
|
|
272 } else { /* node->key == temp->key */
|
|
|
273
|
|
|
274 lzn = (ngx_http_limit_zone_node_t *) &node->color;
|
|
|
275 lznt = (ngx_http_limit_zone_node_t *) &temp->color;
|
|
|
276
|
|
356
|
277 p = (ngx_memn2cmp(lzn->data, lznt->data, lzn->len, lznt->len) < 0)
|
|
|
278 ? &temp->left : &temp->right;
|
|
|
279 }
|
|
274
|
280
|
|
356
|
281 if (*p == sentinel) {
|
|
|
282 break;
|
|
|
283 }
|
|
274
|
284
|
|
356
|
285 temp = *p;
|
|
274
|
286 }
|
|
|
287
|
|
356
|
288 *p = node;
|
|
274
|
289 node->parent = temp;
|
|
|
290 node->left = sentinel;
|
|
|
291 node->right = sentinel;
|
|
|
292 ngx_rbt_red(node);
|
|
|
293 }
|
|
|
294
|
|
|
295
|
|
|
296 static void
|
|
272
|
297 ngx_http_limit_zone_cleanup(void *data)
|
|
|
298 {
|
|
|
299 ngx_http_limit_zone_cleanup_t *lzcln = data;
|
|
|
300
|
|
|
301 ngx_slab_pool_t *shpool;
|
|
|
302 ngx_rbtree_node_t *node;
|
|
|
303 ngx_http_limit_zone_ctx_t *ctx;
|
|
|
304 ngx_http_limit_zone_node_t *lz;
|
|
|
305
|
|
|
306 ctx = lzcln->shm_zone->data;
|
|
|
307 shpool = (ngx_slab_pool_t *) lzcln->shm_zone->shm.addr;
|
|
|
308 node = lzcln->node;
|
|
|
309 lz = (ngx_http_limit_zone_node_t *) &node->color;
|
|
|
310
|
|
|
311 ngx_shmtx_lock(&shpool->mutex);
|
|
|
312
|
|
|
313 ngx_log_debug2(NGX_LOG_DEBUG_HTTP, lzcln->shm_zone->shm.log, 0,
|
|
|
314 "limit zone cleanup: %08XD %d", node->key, lz->conn);
|
|
|
315
|
|
|
316 lz->conn--;
|
|
|
317
|
|
|
318 if (lz->conn == 0) {
|
|
|
319 ngx_rbtree_delete(ctx->rbtree, node);
|
|
|
320 ngx_slab_free_locked(shpool, node);
|
|
|
321 }
|
|
|
322
|
|
|
323 ngx_shmtx_unlock(&shpool->mutex);
|
|
|
324 }
|
|
|
325
|
|
|
326
|
|
|
327 static ngx_int_t
|
|
|
328 ngx_http_limit_zone_init_zone(ngx_shm_zone_t *shm_zone, void *data)
|
|
|
329 {
|
|
|
330 ngx_http_limit_zone_ctx_t *octx = data;
|
|
|
331
|
|
468
|
332 size_t len;
|
|
272
|
333 ngx_slab_pool_t *shpool;
|
|
|
334 ngx_rbtree_node_t *sentinel;
|
|
|
335 ngx_http_limit_zone_ctx_t *ctx;
|
|
|
336
|
|
|
337 ctx = shm_zone->data;
|
|
|
338
|
|
|
339 if (octx) {
|
|
|
340 if (ngx_strcmp(ctx->var.data, octx->var.data) != 0) {
|
|
|
341 ngx_log_error(NGX_LOG_EMERG, shm_zone->shm.log, 0,
|
|
274
|
342 "limit_zone \"%V\" uses the \"%V\" variable "
|
|
272
|
343 "while previously it used the \"%V\" variable",
|
|
480
|
344 &shm_zone->shm.name, &ctx->var, &octx->var);
|
|
272
|
345 return NGX_ERROR;
|
|
|
346 }
|
|
|
347
|
|
|
348 ctx->rbtree = octx->rbtree;
|
|
|
349
|
|
|
350 return NGX_OK;
|
|
|
351 }
|
|
|
352
|
|
|
353 shpool = (ngx_slab_pool_t *) shm_zone->shm.addr;
|
|
|
354
|
|
480
|
355 if (shm_zone->shm.exists) {
|
|
|
356 ctx->rbtree = shpool->data;
|
|
|
357
|
|
|
358 return NGX_OK;
|
|
|
359 }
|
|
|
360
|
|
272
|
361 ctx->rbtree = ngx_slab_alloc(shpool, sizeof(ngx_rbtree_t));
|
|
|
362 if (ctx->rbtree == NULL) {
|
|
|
363 return NGX_ERROR;
|
|
|
364 }
|
|
|
365
|
|
480
|
366 shpool->data = ctx->rbtree;
|
|
|
367
|
|
272
|
368 sentinel = ngx_slab_alloc(shpool, sizeof(ngx_rbtree_node_t));
|
|
|
369 if (sentinel == NULL) {
|
|
|
370 return NGX_ERROR;
|
|
|
371 }
|
|
|
372
|
|
356
|
373 ngx_rbtree_init(ctx->rbtree, sentinel,
|
|
|
374 ngx_http_limit_zone_rbtree_insert_value);
|
|
272
|
375
|
|
480
|
376 len = sizeof(" in limit_zone \"\"") + shm_zone->shm.name.len;
|
|
468
|
377
|
|
|
378 shpool->log_ctx = ngx_slab_alloc(shpool, len);
|
|
|
379 if (shpool->log_ctx == NULL) {
|
|
|
380 return NGX_ERROR;
|
|
|
381 }
|
|
|
382
|
|
480
|
383 ngx_sprintf(shpool->log_ctx, " in limit_zone \"%V\"%Z",
|
|
|
384 &shm_zone->shm.name);
|
|
468
|
385
|
|
272
|
386 return NGX_OK;
|
|
|
387 }
|
|
|
388
|
|
|
389
|
|
|
390 static void *
|
|
|
391 ngx_http_limit_zone_create_conf(ngx_conf_t *cf)
|
|
|
392 {
|
|
|
393 ngx_http_limit_zone_conf_t *conf;
|
|
|
394
|
|
|
395 conf = ngx_pcalloc(cf->pool, sizeof(ngx_http_limit_zone_conf_t));
|
|
|
396 if (conf == NULL) {
|
|
496
|
397 return NULL;
|
|
272
|
398 }
|
|
|
399
|
|
|
400 /*
|
|
|
401 * set by ngx_pcalloc():
|
|
|
402 *
|
|
|
403 * conf->shm_zone = NULL;
|
|
|
404 * conf->conn = 0;
|
|
|
405 */
|
|
|
406
|
|
532
|
407 conf->log_level = NGX_CONF_UNSET_UINT;
|
|
|
408
|
|
272
|
409 return conf;
|
|
|
410 }
|
|
|
411
|
|
|
412
|
|
|
413 static char *
|
|
|
414 ngx_http_limit_zone_merge_conf(ngx_conf_t *cf, void *parent, void *child)
|
|
|
415 {
|
|
|
416 ngx_http_limit_zone_conf_t *prev = parent;
|
|
|
417 ngx_http_limit_zone_conf_t *conf = child;
|
|
|
418
|
|
|
419 if (conf->shm_zone == NULL) {
|
|
644
|
420 conf->shm_zone = prev->shm_zone;
|
|
|
421 conf->conn = prev->conn;
|
|
272
|
422 }
|
|
|
423
|
|
532
|
424 ngx_conf_merge_uint_value(conf->log_level, prev->log_level, NGX_LOG_ERR);
|
|
|
425
|
|
272
|
426 return NGX_CONF_OK;
|
|
|
427 }
|
|
|
428
|
|
|
429
|
|
|
430 static char *
|
|
|
431 ngx_http_limit_zone(ngx_conf_t *cf, ngx_command_t *cmd, void *conf)
|
|
|
432 {
|
|
|
433 ssize_t n;
|
|
|
434 ngx_str_t *value;
|
|
|
435 ngx_shm_zone_t *shm_zone;
|
|
|
436 ngx_http_limit_zone_ctx_t *ctx;
|
|
|
437
|
|
|
438 value = cf->args->elts;
|
|
|
439
|
|
|
440 if (value[2].data[0] != '$') {
|
|
|
441 ngx_conf_log_error(NGX_LOG_EMERG, cf, 0,
|
|
|
442 "invalid variable name \"%V\"", &value[2]);
|
|
|
443 return NGX_CONF_ERROR;
|
|
|
444 }
|
|
|
445
|
|
|
446 value[2].len--;
|
|
|
447 value[2].data++;
|
|
|
448
|
|
|
449 ctx = ngx_pcalloc(cf->pool, sizeof(ngx_http_limit_zone_ctx_t));
|
|
|
450 if (ctx == NULL) {
|
|
|
451 return NGX_CONF_ERROR;
|
|
|
452 }
|
|
|
453
|
|
|
454 ctx->index = ngx_http_get_variable_index(cf, &value[2]);
|
|
|
455 if (ctx->index == NGX_ERROR) {
|
|
|
456 return NGX_CONF_ERROR;
|
|
|
457 }
|
|
|
458
|
|
|
459 ctx->var = value[2];
|
|
|
460
|
|
|
461 n = ngx_parse_size(&value[3]);
|
|
|
462
|
|
|
463 if (n == NGX_ERROR) {
|
|
|
464 ngx_conf_log_error(NGX_LOG_EMERG, cf, 0,
|
|
|
465 "invalid size of limit_zone \"%V\"", &value[3]);
|
|
|
466 return NGX_CONF_ERROR;
|
|
|
467 }
|
|
|
468
|
|
|
469 if (n < (ngx_int_t) (8 * ngx_pagesize)) {
|
|
|
470 ngx_conf_log_error(NGX_LOG_EMERG, cf, 0,
|
|
|
471 "limit_zone \"%V\" is too small", &value[1]);
|
|
|
472 return NGX_CONF_ERROR;
|
|
|
473 }
|
|
|
474
|
|
|
475
|
|
|
476 shm_zone = ngx_shared_memory_add(cf, &value[1], n,
|
|
|
477 &ngx_http_limit_zone_module);
|
|
|
478 if (shm_zone == NULL) {
|
|
|
479 return NGX_CONF_ERROR;
|
|
|
480 }
|
|
|
481
|
|
|
482 if (shm_zone->data) {
|
|
|
483 ctx = shm_zone->data;
|
|
|
484
|
|
|
485 ngx_conf_log_error(NGX_LOG_EMERG, cf, 0,
|
|
|
486 "limit_zone \"%V\" is already bound to variable \"%V\"",
|
|
|
487 &value[1], &ctx->var);
|
|
|
488 return NGX_CONF_ERROR;
|
|
|
489 }
|
|
|
490
|
|
|
491 shm_zone->init = ngx_http_limit_zone_init_zone;
|
|
|
492 shm_zone->data = ctx;
|
|
|
493
|
|
|
494 return NGX_CONF_OK;
|
|
|
495 }
|
|
|
496
|
|
|
497
|
|
|
498 static char *
|
|
|
499 ngx_http_limit_conn(ngx_conf_t *cf, ngx_command_t *cmd, void *conf)
|
|
|
500 {
|
|
|
501 ngx_http_limit_zone_conf_t *lzcf = conf;
|
|
|
502
|
|
|
503 ngx_int_t n;
|
|
|
504 ngx_str_t *value;
|
|
|
505
|
|
426
|
506 if (lzcf->shm_zone) {
|
|
|
507 return "is duplicate";
|
|
|
508 }
|
|
|
509
|
|
272
|
510 value = cf->args->elts;
|
|
|
511
|
|
|
512 lzcf->shm_zone = ngx_shared_memory_add(cf, &value[1], 0,
|
|
|
513 &ngx_http_limit_zone_module);
|
|
|
514 if (lzcf->shm_zone == NULL) {
|
|
|
515 return NGX_CONF_ERROR;
|
|
|
516 }
|
|
|
517
|
|
|
518 n = ngx_atoi(value[2].data, value[2].len);
|
|
|
519 if (n <= 0) {
|
|
|
520 ngx_conf_log_error(NGX_LOG_EMERG, cf, 0,
|
|
|
521 "invalid number of connections \"%V\"", &value[2]);
|
|
|
522 return NGX_CONF_ERROR;
|
|
|
523 }
|
|
|
524
|
|
274
|
525 if (n > 65535) {
|
|
|
526 ngx_conf_log_error(NGX_LOG_EMERG, cf, 0,
|
|
|
527 "connection limit must be less 65536");
|
|
|
528 return NGX_CONF_ERROR;
|
|
|
529 }
|
|
|
530
|
|
272
|
531 lzcf->conn = n;
|
|
|
532
|
|
|
533 return NGX_CONF_OK;
|
|
|
534 }
|
|
|
535
|
|
|
536
|
|
|
537 static ngx_int_t
|
|
|
538 ngx_http_limit_zone_init(ngx_conf_t *cf)
|
|
|
539 {
|
|
|
540 ngx_http_handler_pt *h;
|
|
|
541 ngx_http_core_main_conf_t *cmcf;
|
|
|
542
|
|
|
543 cmcf = ngx_http_conf_get_module_main_conf(cf, ngx_http_core_module);
|
|
|
544
|
|
|
545 h = ngx_array_push(&cmcf->phases[NGX_HTTP_PREACCESS_PHASE].handlers);
|
|
|
546 if (h == NULL) {
|
|
|
547 return NGX_ERROR;
|
|
|
548 }
|
|
|
549
|
|
|
550 *h = ngx_http_limit_zone_handler;
|
|
|
551
|
|
|
552 return NGX_OK;
|
|
|
553 }
|
