Mercurial > hg > nginx-quic
annotate src/http/modules/ngx_http_limit_zone_module.c @ 4450:4919fb357a5d stable-1.0
Merge of r4406, r4413: copyrights updated.
author | Maxim Dounin <mdounin@mdounin.ru> |
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date | Sun, 05 Feb 2012 20:02:59 +0000 |
parents | 97995d63aa36 |
children | 8bb695c05870 |
rev | line source |
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980 | 1 |
2 /* | |
3 * Copyright (C) Igor Sysoev | |
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4 * Copyright (C) Nginx, Inc. |
980 | 5 */ |
6 | |
7 | |
8 #include <ngx_config.h> | |
9 #include <ngx_core.h> | |
10 #include <ngx_http.h> | |
11 | |
12 | |
13 typedef struct { | |
981 | 14 u_char color; |
15 u_char len; | |
980 | 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 { | |
987 | 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 { | |
980 | 35 ngx_shm_zone_t *shm_zone; |
36 ngx_uint_t conn; | |
3186 | 37 ngx_uint_t log_level; |
980 | 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 | |
3186 | 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 | |
980 | 62 static ngx_command_t ngx_http_limit_zone_commands[] = { |
63 | |
64 { ngx_string("limit_zone"), | |
987 | 65 NGX_HTTP_MAIN_CONF|NGX_CONF_TAKE3, |
980 | 66 ngx_http_limit_zone, |
67 0, | |
68 0, | |
69 NULL }, | |
70 | |
71 { ngx_string("limit_conn"), | |
987 | 72 NGX_HTTP_MAIN_CONF|NGX_HTTP_SRV_CONF|NGX_HTTP_LOC_CONF|NGX_CONF_TAKE2, |
980 | 73 ngx_http_limit_conn, |
74 NGX_HTTP_LOC_CONF_OFFSET, | |
75 0, | |
76 NULL }, | |
77 | |
3186 | 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 | |
980 | 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 | |
99 ngx_http_limit_zone_create_conf, /* create location configration */ | |
100 ngx_http_limit_zone_merge_conf /* merge location configration */ | |
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; | |
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125 ngx_int_t rc; |
980 | 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; | |
987 | 130 ngx_http_limit_zone_ctx_t *ctx; |
980 | 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 | |
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135 if (r->main->limit_zone_set) { |
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136 return NGX_DECLINED; |
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137 } |
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138 |
980 | 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 | |
987 | 145 ctx = lzcf->shm_zone->data; |
146 | |
147 vv = ngx_http_get_indexed_variable(r, ctx->index); | |
980 | 148 |
149 if (vv == NULL || vv->not_found) { | |
150 return NGX_DECLINED; | |
151 } | |
152 | |
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153 len = vv->len; |
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154 |
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155 if (len == 0) { |
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156 return NGX_DECLINED; |
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157 } |
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158 |
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159 if (len > 255) { |
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160 ngx_log_error(NGX_LOG_ERR, r->connection->log, 0, |
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161 "the value of the \"%V\" variable " |
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162 "is more than 255 bytes: \"%v\"", |
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163 &ctx->var, vv); |
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164 return NGX_DECLINED; |
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165 } |
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166 |
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167 r->main->limit_zone_set = 1; |
980 | 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 | |
987 | 180 node = ctx->rbtree->root; |
181 sentinel = ctx->rbtree->sentinel; | |
980 | 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 | |
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195 /* hash == node->key */ |
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196 |
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197 do { |
981 | 198 lz = (ngx_http_limit_zone_node_t *) &node->color; |
980 | 199 |
1036 | 200 rc = ngx_memn2cmp(vv->data, lz->data, len, (size_t) lz->len); |
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201 |
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202 if (rc == 0) { |
981 | 203 if ((ngx_uint_t) lz->conn < lzcf->conn) { |
980 | 204 lz->conn++; |
205 goto done; | |
206 } | |
207 | |
208 ngx_shmtx_unlock(&shpool->mutex); | |
209 | |
3186 | 210 ngx_log_error(lzcf->log_level, r->connection->log, 0, |
2373 | 211 "limiting connections by zone \"%V\"", |
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212 &lzcf->shm_zone->shm.name); |
2373 | 213 |
980 | 214 return NGX_HTTP_SERVICE_UNAVAILABLE; |
215 } | |
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216 |
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217 node = (rc < 0) ? node->left : node->right; |
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218 |
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219 } while (node != sentinel && hash == node->key); |
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220 |
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221 break; |
980 | 222 } |
223 | |
981 | 224 n = offsetof(ngx_rbtree_node_t, color) |
980 | 225 + offsetof(ngx_http_limit_zone_node_t, data) |
226 + len; | |
227 | |
228 node = ngx_slab_alloc_locked(shpool, n); | |
229 if (node == NULL) { | |
230 ngx_shmtx_unlock(&shpool->mutex); | |
231 return NGX_HTTP_SERVICE_UNAVAILABLE; | |
232 } | |
233 | |
981 | 234 lz = (ngx_http_limit_zone_node_t *) &node->color; |
980 | 235 |
236 node->key = hash; | |
981 | 237 lz->len = (u_char) len; |
980 | 238 lz->conn = 1; |
239 ngx_memcpy(lz->data, vv->data, len); | |
240 | |
987 | 241 ngx_rbtree_insert(ctx->rbtree, node); |
980 | 242 |
243 done: | |
244 | |
245 ngx_log_debug2(NGX_LOG_DEBUG_HTTP, r->connection->log, 0, | |
246 "limit zone: %08XD %d", node->key, lz->conn); | |
247 | |
248 ngx_shmtx_unlock(&shpool->mutex); | |
249 | |
250 cln->handler = ngx_http_limit_zone_cleanup; | |
251 lzcln = cln->data; | |
252 | |
253 lzcln->shm_zone = lzcf->shm_zone; | |
254 lzcln->node = node; | |
255 | |
256 return NGX_DECLINED; | |
257 } | |
258 | |
259 | |
260 static void | |
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261 ngx_http_limit_zone_rbtree_insert_value(ngx_rbtree_node_t *temp, |
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262 ngx_rbtree_node_t *node, ngx_rbtree_node_t *sentinel) |
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263 { |
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264 ngx_rbtree_node_t **p; |
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265 ngx_http_limit_zone_node_t *lzn, *lznt; |
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266 |
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267 for ( ;; ) { |
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268 |
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269 if (node->key < temp->key) { |
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270 |
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271 p = &temp->left; |
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272 |
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273 } else if (node->key > temp->key) { |
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274 |
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275 p = &temp->right; |
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276 |
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277 } else { /* node->key == temp->key */ |
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278 |
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279 lzn = (ngx_http_limit_zone_node_t *) &node->color; |
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280 lznt = (ngx_http_limit_zone_node_t *) &temp->color; |
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281 |
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282 p = (ngx_memn2cmp(lzn->data, lznt->data, lzn->len, lznt->len) < 0) |
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283 ? &temp->left : &temp->right; |
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284 } |
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285 |
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286 if (*p == sentinel) { |
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287 break; |
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288 } |
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289 |
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290 temp = *p; |
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291 } |
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292 |
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293 *p = node; |
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294 node->parent = temp; |
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295 node->left = sentinel; |
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296 node->right = sentinel; |
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297 ngx_rbt_red(node); |
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298 } |
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299 |
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300 |
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301 static void |
980 | 302 ngx_http_limit_zone_cleanup(void *data) |
303 { | |
304 ngx_http_limit_zone_cleanup_t *lzcln = data; | |
305 | |
306 ngx_slab_pool_t *shpool; | |
307 ngx_rbtree_node_t *node; | |
987 | 308 ngx_http_limit_zone_ctx_t *ctx; |
980 | 309 ngx_http_limit_zone_node_t *lz; |
310 | |
987 | 311 ctx = lzcln->shm_zone->data; |
980 | 312 shpool = (ngx_slab_pool_t *) lzcln->shm_zone->shm.addr; |
313 node = lzcln->node; | |
981 | 314 lz = (ngx_http_limit_zone_node_t *) &node->color; |
980 | 315 |
316 ngx_shmtx_lock(&shpool->mutex); | |
317 | |
318 ngx_log_debug2(NGX_LOG_DEBUG_HTTP, lzcln->shm_zone->shm.log, 0, | |
319 "limit zone cleanup: %08XD %d", node->key, lz->conn); | |
320 | |
321 lz->conn--; | |
322 | |
323 if (lz->conn == 0) { | |
987 | 324 ngx_rbtree_delete(ctx->rbtree, node); |
980 | 325 ngx_slab_free_locked(shpool, node); |
326 } | |
327 | |
328 ngx_shmtx_unlock(&shpool->mutex); | |
329 } | |
330 | |
331 | |
332 static ngx_int_t | |
993
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333 ngx_http_limit_zone_init_zone(ngx_shm_zone_t *shm_zone, void *data) |
980 | 334 { |
993
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335 ngx_http_limit_zone_ctx_t *octx = data; |
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336 |
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337 size_t len; |
987 | 338 ngx_slab_pool_t *shpool; |
339 ngx_rbtree_node_t *sentinel; | |
340 ngx_http_limit_zone_ctx_t *ctx; | |
980 | 341 |
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342 ctx = shm_zone->data; |
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343 |
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344 if (octx) { |
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345 if (ngx_strcmp(ctx->var.data, octx->var.data) != 0) { |
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346 ngx_log_error(NGX_LOG_EMERG, shm_zone->shm.log, 0, |
1001 | 347 "limit_zone \"%V\" uses the \"%V\" variable " |
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348 "while previously it used the \"%V\" variable", |
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349 &shm_zone->shm.name, &ctx->var, &octx->var); |
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350 return NGX_ERROR; |
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351 } |
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352 |
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353 ctx->rbtree = octx->rbtree; |
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354 |
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355 return NGX_OK; |
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356 } |
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357 |
980 | 358 shpool = (ngx_slab_pool_t *) shm_zone->shm.addr; |
359 | |
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360 if (shm_zone->shm.exists) { |
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361 ctx->rbtree = shpool->data; |
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362 |
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363 return NGX_OK; |
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364 } |
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365 |
987 | 366 ctx->rbtree = ngx_slab_alloc(shpool, sizeof(ngx_rbtree_t)); |
367 if (ctx->rbtree == NULL) { | |
980 | 368 return NGX_ERROR; |
369 } | |
370 | |
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371 shpool->data = ctx->rbtree; |
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372 |
980 | 373 sentinel = ngx_slab_alloc(shpool, sizeof(ngx_rbtree_node_t)); |
374 if (sentinel == NULL) { | |
375 return NGX_ERROR; | |
376 } | |
377 | |
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378 ngx_rbtree_init(ctx->rbtree, sentinel, |
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379 ngx_http_limit_zone_rbtree_insert_value); |
980 | 380 |
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381 len = sizeof(" in limit_zone \"\"") + shm_zone->shm.name.len; |
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382 |
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383 shpool->log_ctx = ngx_slab_alloc(shpool, len); |
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384 if (shpool->log_ctx == NULL) { |
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385 return NGX_ERROR; |
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386 } |
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387 |
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388 ngx_sprintf(shpool->log_ctx, " in limit_zone \"%V\"%Z", |
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389 &shm_zone->shm.name); |
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390 |
980 | 391 return NGX_OK; |
392 } | |
393 | |
394 | |
395 static void * | |
396 ngx_http_limit_zone_create_conf(ngx_conf_t *cf) | |
397 { | |
398 ngx_http_limit_zone_conf_t *conf; | |
399 | |
400 conf = ngx_pcalloc(cf->pool, sizeof(ngx_http_limit_zone_conf_t)); | |
401 if (conf == NULL) { | |
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402 return NULL; |
980 | 403 } |
404 | |
405 /* | |
406 * set by ngx_pcalloc(): | |
407 * | |
408 * conf->shm_zone = NULL; | |
409 * conf->conn = 0; | |
410 */ | |
411 | |
3186 | 412 conf->log_level = NGX_CONF_UNSET_UINT; |
413 | |
980 | 414 return conf; |
415 } | |
416 | |
417 | |
418 static char * | |
419 ngx_http_limit_zone_merge_conf(ngx_conf_t *cf, void *parent, void *child) | |
420 { | |
421 ngx_http_limit_zone_conf_t *prev = parent; | |
422 ngx_http_limit_zone_conf_t *conf = child; | |
423 | |
424 if (conf->shm_zone == NULL) { | |
4440 | 425 conf->shm_zone = prev->shm_zone; |
426 conf->conn = prev->conn; | |
980 | 427 } |
428 | |
3186 | 429 ngx_conf_merge_uint_value(conf->log_level, prev->log_level, NGX_LOG_ERR); |
430 | |
980 | 431 return NGX_CONF_OK; |
432 } | |
433 | |
434 | |
435 static char * | |
436 ngx_http_limit_zone(ngx_conf_t *cf, ngx_command_t *cmd, void *conf) | |
437 { | |
987 | 438 ssize_t n; |
439 ngx_str_t *value; | |
440 ngx_shm_zone_t *shm_zone; | |
441 ngx_http_limit_zone_ctx_t *ctx; | |
980 | 442 |
443 value = cf->args->elts; | |
444 | |
987 | 445 if (value[2].data[0] != '$') { |
446 ngx_conf_log_error(NGX_LOG_EMERG, cf, 0, | |
447 "invalid variable name \"%V\"", &value[2]); | |
448 return NGX_CONF_ERROR; | |
449 } | |
450 | |
451 value[2].len--; | |
452 value[2].data++; | |
453 | |
454 ctx = ngx_pcalloc(cf->pool, sizeof(ngx_http_limit_zone_ctx_t)); | |
455 if (ctx == NULL) { | |
456 return NGX_CONF_ERROR; | |
457 } | |
458 | |
459 ctx->index = ngx_http_get_variable_index(cf, &value[2]); | |
460 if (ctx->index == NGX_ERROR) { | |
461 return NGX_CONF_ERROR; | |
462 } | |
463 | |
464 ctx->var = value[2]; | |
465 | |
466 n = ngx_parse_size(&value[3]); | |
980 | 467 |
468 if (n == NGX_ERROR) { | |
469 ngx_conf_log_error(NGX_LOG_EMERG, cf, 0, | |
987 | 470 "invalid size of limit_zone \"%V\"", &value[3]); |
980 | 471 return NGX_CONF_ERROR; |
472 } | |
473 | |
474 if (n < (ngx_int_t) (8 * ngx_pagesize)) { | |
475 ngx_conf_log_error(NGX_LOG_EMERG, cf, 0, | |
476 "limit_zone \"%V\" is too small", &value[1]); | |
477 return NGX_CONF_ERROR; | |
478 } | |
479 | |
480 | |
481 shm_zone = ngx_shared_memory_add(cf, &value[1], n, | |
482 &ngx_http_limit_zone_module); | |
483 if (shm_zone == NULL) { | |
484 return NGX_CONF_ERROR; | |
485 } | |
486 | |
987 | 487 if (shm_zone->data) { |
488 ctx = shm_zone->data; | |
489 | |
490 ngx_conf_log_error(NGX_LOG_EMERG, cf, 0, | |
491 "limit_zone \"%V\" is already bound to variable \"%V\"", | |
492 &value[1], &ctx->var); | |
493 return NGX_CONF_ERROR; | |
494 } | |
495 | |
980 | 496 shm_zone->init = ngx_http_limit_zone_init_zone; |
987 | 497 shm_zone->data = ctx; |
980 | 498 |
499 return NGX_CONF_OK; | |
500 } | |
501 | |
502 | |
503 static char * | |
504 ngx_http_limit_conn(ngx_conf_t *cf, ngx_command_t *cmd, void *conf) | |
505 { | |
506 ngx_http_limit_zone_conf_t *lzcf = conf; | |
507 | |
508 ngx_int_t n; | |
509 ngx_str_t *value; | |
510 | |
2372 | 511 if (lzcf->shm_zone) { |
512 return "is duplicate"; | |
513 } | |
514 | |
980 | 515 value = cf->args->elts; |
516 | |
987 | 517 lzcf->shm_zone = ngx_shared_memory_add(cf, &value[1], 0, |
518 &ngx_http_limit_zone_module); | |
519 if (lzcf->shm_zone == NULL) { | |
980 | 520 return NGX_CONF_ERROR; |
521 } | |
522 | |
987 | 523 n = ngx_atoi(value[2].data, value[2].len); |
524 if (n <= 0) { | |
980 | 525 ngx_conf_log_error(NGX_LOG_EMERG, cf, 0, |
987 | 526 "invalid number of connections \"%V\"", &value[2]); |
980 | 527 return NGX_CONF_ERROR; |
528 } | |
529 | |
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530 if (n > 65535) { |
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531 ngx_conf_log_error(NGX_LOG_EMERG, cf, 0, |
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532 "connection limit must be less 65536"); |
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533 return NGX_CONF_ERROR; |
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534 } |
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535 |
980 | 536 lzcf->conn = n; |
537 | |
538 return NGX_CONF_OK; | |
539 } | |
540 | |
541 | |
542 static ngx_int_t | |
543 ngx_http_limit_zone_init(ngx_conf_t *cf) | |
544 { | |
545 ngx_http_handler_pt *h; | |
546 ngx_http_core_main_conf_t *cmcf; | |
547 | |
548 cmcf = ngx_http_conf_get_module_main_conf(cf, ngx_http_core_module); | |
549 | |
550 h = ngx_array_push(&cmcf->phases[NGX_HTTP_PREACCESS_PHASE].handlers); | |
551 if (h == NULL) { | |
552 return NGX_ERROR; | |
553 } | |
554 | |
555 *h = ngx_http_limit_zone_handler; | |
556 | |
557 return NGX_OK; | |
558 } |