Mercurial > hg > nginx
annotate src/http/modules/ngx_http_limit_zone_module.c @ 3280:9285e936c79d
fix directive name in error message: "set_realip_from" to "set_real_ip_from"
author | Igor Sysoev <igor@sysoev.ru> |
---|---|
date | Tue, 03 Nov 2009 14:41:56 +0000 |
parents | 23d567eabc5d |
children | 3544987fef85 97995d63aa36 |
rev | line source |
---|---|
980 | 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 { | |
981 | 13 u_char color; |
14 u_char len; | |
980 | 15 u_short conn; |
16 u_char data[1]; | |
17 } ngx_http_limit_zone_node_t; | |
18 | |
19 | |
20 typedef struct { | |
21 ngx_shm_zone_t *shm_zone; | |
22 ngx_rbtree_node_t *node; | |
23 } ngx_http_limit_zone_cleanup_t; | |
24 | |
25 | |
26 typedef struct { | |
987 | 27 ngx_rbtree_t *rbtree; |
28 ngx_int_t index; | |
29 ngx_str_t var; | |
30 } ngx_http_limit_zone_ctx_t; | |
31 | |
32 | |
33 typedef struct { | |
980 | 34 ngx_shm_zone_t *shm_zone; |
35 ngx_uint_t conn; | |
3186 | 36 ngx_uint_t log_level; |
980 | 37 } ngx_http_limit_zone_conf_t; |
38 | |
39 | |
40 static void ngx_http_limit_zone_cleanup(void *data); | |
41 | |
42 static void *ngx_http_limit_zone_create_conf(ngx_conf_t *cf); | |
43 static char *ngx_http_limit_zone_merge_conf(ngx_conf_t *cf, void *parent, | |
44 void *child); | |
45 static char *ngx_http_limit_zone(ngx_conf_t *cf, ngx_command_t *cmd, | |
46 void *conf); | |
47 static char *ngx_http_limit_conn(ngx_conf_t *cf, ngx_command_t *cmd, | |
48 void *conf); | |
49 static ngx_int_t ngx_http_limit_zone_init(ngx_conf_t *cf); | |
50 | |
51 | |
3186 | 52 static ngx_conf_enum_t ngx_http_limit_conn_log_levels[] = { |
53 { ngx_string("info"), NGX_LOG_INFO }, | |
54 { ngx_string("notice"), NGX_LOG_NOTICE }, | |
55 { ngx_string("warn"), NGX_LOG_WARN }, | |
56 { ngx_string("error"), NGX_LOG_ERR }, | |
57 { ngx_null_string, 0 } | |
58 }; | |
59 | |
60 | |
980 | 61 static ngx_command_t ngx_http_limit_zone_commands[] = { |
62 | |
63 { ngx_string("limit_zone"), | |
987 | 64 NGX_HTTP_MAIN_CONF|NGX_CONF_TAKE3, |
980 | 65 ngx_http_limit_zone, |
66 0, | |
67 0, | |
68 NULL }, | |
69 | |
70 { ngx_string("limit_conn"), | |
987 | 71 NGX_HTTP_MAIN_CONF|NGX_HTTP_SRV_CONF|NGX_HTTP_LOC_CONF|NGX_CONF_TAKE2, |
980 | 72 ngx_http_limit_conn, |
73 NGX_HTTP_LOC_CONF_OFFSET, | |
74 0, | |
75 NULL }, | |
76 | |
3186 | 77 { ngx_string("limit_conn_log_level"), |
78 NGX_HTTP_MAIN_CONF|NGX_HTTP_SRV_CONF|NGX_HTTP_LOC_CONF|NGX_CONF_TAKE1, | |
79 ngx_conf_set_enum_slot, | |
80 NGX_HTTP_LOC_CONF_OFFSET, | |
81 offsetof(ngx_http_limit_zone_conf_t, log_level), | |
82 &ngx_http_limit_conn_log_levels }, | |
83 | |
980 | 84 ngx_null_command |
85 }; | |
86 | |
87 | |
88 static ngx_http_module_t ngx_http_limit_zone_module_ctx = { | |
89 NULL, /* preconfiguration */ | |
90 ngx_http_limit_zone_init, /* postconfiguration */ | |
91 | |
92 NULL, /* create main configuration */ | |
93 NULL, /* init main configuration */ | |
94 | |
95 NULL, /* create server configuration */ | |
96 NULL, /* merge server configuration */ | |
97 | |
98 ngx_http_limit_zone_create_conf, /* create location configration */ | |
99 ngx_http_limit_zone_merge_conf /* merge location configration */ | |
100 }; | |
101 | |
102 | |
103 ngx_module_t ngx_http_limit_zone_module = { | |
104 NGX_MODULE_V1, | |
105 &ngx_http_limit_zone_module_ctx, /* module context */ | |
106 ngx_http_limit_zone_commands, /* module directives */ | |
107 NGX_HTTP_MODULE, /* module type */ | |
108 NULL, /* init master */ | |
109 NULL, /* init module */ | |
110 NULL, /* init process */ | |
111 NULL, /* init thread */ | |
112 NULL, /* exit thread */ | |
113 NULL, /* exit process */ | |
114 NULL, /* exit master */ | |
115 NGX_MODULE_V1_PADDING | |
116 }; | |
117 | |
118 | |
119 static ngx_int_t | |
120 ngx_http_limit_zone_handler(ngx_http_request_t *r) | |
121 { | |
122 size_t len, n; | |
123 uint32_t hash; | |
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124 ngx_int_t rc; |
980 | 125 ngx_slab_pool_t *shpool; |
126 ngx_rbtree_node_t *node, *sentinel; | |
127 ngx_pool_cleanup_t *cln; | |
128 ngx_http_variable_value_t *vv; | |
987 | 129 ngx_http_limit_zone_ctx_t *ctx; |
980 | 130 ngx_http_limit_zone_node_t *lz; |
131 ngx_http_limit_zone_conf_t *lzcf; | |
132 ngx_http_limit_zone_cleanup_t *lzcln; | |
133 | |
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134 if (r->main->limit_zone_set) { |
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135 return NGX_DECLINED; |
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136 } |
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137 |
980 | 138 lzcf = ngx_http_get_module_loc_conf(r, ngx_http_limit_zone_module); |
139 | |
140 if (lzcf->shm_zone == NULL) { | |
141 return NGX_DECLINED; | |
142 } | |
143 | |
987 | 144 ctx = lzcf->shm_zone->data; |
145 | |
146 vv = ngx_http_get_indexed_variable(r, ctx->index); | |
980 | 147 |
148 if (vv == NULL || vv->not_found) { | |
149 return NGX_DECLINED; | |
150 } | |
151 | |
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152 len = vv->len; |
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153 |
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154 if (len == 0) { |
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155 return NGX_DECLINED; |
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156 } |
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157 |
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158 if (len > 255) { |
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159 ngx_log_error(NGX_LOG_ERR, r->connection->log, 0, |
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160 "the value of the \"%V\" variable " |
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161 "is more than 255 bytes: \"%v\"", |
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162 &ctx->var, vv); |
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163 return NGX_DECLINED; |
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164 } |
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165 |
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166 r->main->limit_zone_set = 1; |
980 | 167 |
168 hash = ngx_crc32_short(vv->data, len); | |
169 | |
170 cln = ngx_pool_cleanup_add(r->pool, sizeof(ngx_http_limit_zone_cleanup_t)); | |
171 if (cln == NULL) { | |
172 return NGX_HTTP_INTERNAL_SERVER_ERROR; | |
173 } | |
174 | |
175 shpool = (ngx_slab_pool_t *) lzcf->shm_zone->shm.addr; | |
176 | |
177 ngx_shmtx_lock(&shpool->mutex); | |
178 | |
987 | 179 node = ctx->rbtree->root; |
180 sentinel = ctx->rbtree->sentinel; | |
980 | 181 |
182 while (node != sentinel) { | |
183 | |
184 if (hash < node->key) { | |
185 node = node->left; | |
186 continue; | |
187 } | |
188 | |
189 if (hash > node->key) { | |
190 node = node->right; | |
191 continue; | |
192 } | |
193 | |
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194 /* hash == node->key */ |
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195 |
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196 do { |
981 | 197 lz = (ngx_http_limit_zone_node_t *) &node->color; |
980 | 198 |
1036 | 199 rc = ngx_memn2cmp(vv->data, lz->data, len, (size_t) lz->len); |
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200 |
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201 if (rc == 0) { |
981 | 202 if ((ngx_uint_t) lz->conn < lzcf->conn) { |
980 | 203 lz->conn++; |
204 goto done; | |
205 } | |
206 | |
207 ngx_shmtx_unlock(&shpool->mutex); | |
208 | |
3186 | 209 ngx_log_error(lzcf->log_level, r->connection->log, 0, |
2373 | 210 "limiting connections by zone \"%V\"", |
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211 &lzcf->shm_zone->shm.name); |
2373 | 212 |
980 | 213 return NGX_HTTP_SERVICE_UNAVAILABLE; |
214 } | |
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215 |
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216 node = (rc < 0) ? node->left : node->right; |
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217 |
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218 } while (node != sentinel && hash == node->key); |
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219 |
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220 break; |
980 | 221 } |
222 | |
981 | 223 n = offsetof(ngx_rbtree_node_t, color) |
980 | 224 + offsetof(ngx_http_limit_zone_node_t, data) |
225 + len; | |
226 | |
227 node = ngx_slab_alloc_locked(shpool, n); | |
228 if (node == NULL) { | |
229 ngx_shmtx_unlock(&shpool->mutex); | |
230 return NGX_HTTP_SERVICE_UNAVAILABLE; | |
231 } | |
232 | |
981 | 233 lz = (ngx_http_limit_zone_node_t *) &node->color; |
980 | 234 |
235 node->key = hash; | |
981 | 236 lz->len = (u_char) len; |
980 | 237 lz->conn = 1; |
238 ngx_memcpy(lz->data, vv->data, len); | |
239 | |
987 | 240 ngx_rbtree_insert(ctx->rbtree, node); |
980 | 241 |
242 done: | |
243 | |
244 ngx_log_debug2(NGX_LOG_DEBUG_HTTP, r->connection->log, 0, | |
245 "limit zone: %08XD %d", node->key, lz->conn); | |
246 | |
247 ngx_shmtx_unlock(&shpool->mutex); | |
248 | |
249 cln->handler = ngx_http_limit_zone_cleanup; | |
250 lzcln = cln->data; | |
251 | |
252 lzcln->shm_zone = lzcf->shm_zone; | |
253 lzcln->node = node; | |
254 | |
255 return NGX_DECLINED; | |
256 } | |
257 | |
258 | |
259 static void | |
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260 ngx_http_limit_zone_rbtree_insert_value(ngx_rbtree_node_t *temp, |
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261 ngx_rbtree_node_t *node, ngx_rbtree_node_t *sentinel) |
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262 { |
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263 ngx_rbtree_node_t **p; |
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264 ngx_http_limit_zone_node_t *lzn, *lznt; |
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265 |
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266 for ( ;; ) { |
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267 |
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268 if (node->key < temp->key) { |
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269 |
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270 p = &temp->left; |
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271 |
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272 } else if (node->key > temp->key) { |
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273 |
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274 p = &temp->right; |
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275 |
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276 } else { /* node->key == temp->key */ |
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277 |
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278 lzn = (ngx_http_limit_zone_node_t *) &node->color; |
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279 lznt = (ngx_http_limit_zone_node_t *) &temp->color; |
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280 |
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281 p = (ngx_memn2cmp(lzn->data, lznt->data, lzn->len, lznt->len) < 0) |
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282 ? &temp->left : &temp->right; |
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283 } |
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284 |
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285 if (*p == sentinel) { |
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286 break; |
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287 } |
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288 |
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289 temp = *p; |
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290 } |
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291 |
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292 *p = node; |
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293 node->parent = temp; |
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294 node->left = sentinel; |
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295 node->right = sentinel; |
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296 ngx_rbt_red(node); |
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297 } |
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298 |
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299 |
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300 static void |
980 | 301 ngx_http_limit_zone_cleanup(void *data) |
302 { | |
303 ngx_http_limit_zone_cleanup_t *lzcln = data; | |
304 | |
305 ngx_slab_pool_t *shpool; | |
306 ngx_rbtree_node_t *node; | |
987 | 307 ngx_http_limit_zone_ctx_t *ctx; |
980 | 308 ngx_http_limit_zone_node_t *lz; |
309 | |
987 | 310 ctx = lzcln->shm_zone->data; |
980 | 311 shpool = (ngx_slab_pool_t *) lzcln->shm_zone->shm.addr; |
312 node = lzcln->node; | |
981 | 313 lz = (ngx_http_limit_zone_node_t *) &node->color; |
980 | 314 |
315 ngx_shmtx_lock(&shpool->mutex); | |
316 | |
317 ngx_log_debug2(NGX_LOG_DEBUG_HTTP, lzcln->shm_zone->shm.log, 0, | |
318 "limit zone cleanup: %08XD %d", node->key, lz->conn); | |
319 | |
320 lz->conn--; | |
321 | |
322 if (lz->conn == 0) { | |
987 | 323 ngx_rbtree_delete(ctx->rbtree, node); |
980 | 324 ngx_slab_free_locked(shpool, node); |
325 } | |
326 | |
327 ngx_shmtx_unlock(&shpool->mutex); | |
328 } | |
329 | |
330 | |
331 static ngx_int_t | |
993
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332 ngx_http_limit_zone_init_zone(ngx_shm_zone_t *shm_zone, void *data) |
980 | 333 { |
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334 ngx_http_limit_zone_ctx_t *octx = data; |
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335 |
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336 size_t len; |
987 | 337 ngx_slab_pool_t *shpool; |
338 ngx_rbtree_node_t *sentinel; | |
339 ngx_http_limit_zone_ctx_t *ctx; | |
980 | 340 |
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341 ctx = shm_zone->data; |
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342 |
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343 if (octx) { |
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344 if (ngx_strcmp(ctx->var.data, octx->var.data) != 0) { |
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345 ngx_log_error(NGX_LOG_EMERG, shm_zone->shm.log, 0, |
1001 | 346 "limit_zone \"%V\" uses the \"%V\" variable " |
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347 "while previously it used the \"%V\" variable", |
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348 &shm_zone->shm.name, &ctx->var, &octx->var); |
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349 return NGX_ERROR; |
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350 } |
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351 |
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352 ctx->rbtree = octx->rbtree; |
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353 |
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354 return NGX_OK; |
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355 } |
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356 |
980 | 357 shpool = (ngx_slab_pool_t *) shm_zone->shm.addr; |
358 | |
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359 if (shm_zone->shm.exists) { |
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360 ctx->rbtree = shpool->data; |
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361 |
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362 return NGX_OK; |
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363 } |
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364 |
987 | 365 ctx->rbtree = ngx_slab_alloc(shpool, sizeof(ngx_rbtree_t)); |
366 if (ctx->rbtree == NULL) { | |
980 | 367 return NGX_ERROR; |
368 } | |
369 | |
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370 shpool->data = ctx->rbtree; |
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371 |
980 | 372 sentinel = ngx_slab_alloc(shpool, sizeof(ngx_rbtree_node_t)); |
373 if (sentinel == NULL) { | |
374 return NGX_ERROR; | |
375 } | |
376 | |
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377 ngx_rbtree_init(ctx->rbtree, sentinel, |
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378 ngx_http_limit_zone_rbtree_insert_value); |
980 | 379 |
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380 len = sizeof(" in limit_zone \"\"") + shm_zone->shm.name.len; |
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381 |
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382 shpool->log_ctx = ngx_slab_alloc(shpool, len); |
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383 if (shpool->log_ctx == NULL) { |
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384 return NGX_ERROR; |
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385 } |
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386 |
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387 ngx_sprintf(shpool->log_ctx, " in limit_zone \"%V\"%Z", |
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388 &shm_zone->shm.name); |
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389 |
980 | 390 return NGX_OK; |
391 } | |
392 | |
393 | |
394 static void * | |
395 ngx_http_limit_zone_create_conf(ngx_conf_t *cf) | |
396 { | |
397 ngx_http_limit_zone_conf_t *conf; | |
398 | |
399 conf = ngx_pcalloc(cf->pool, sizeof(ngx_http_limit_zone_conf_t)); | |
400 if (conf == NULL) { | |
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401 return NULL; |
980 | 402 } |
403 | |
404 /* | |
405 * set by ngx_pcalloc(): | |
406 * | |
407 * conf->shm_zone = NULL; | |
408 * conf->conn = 0; | |
409 */ | |
410 | |
3186 | 411 conf->log_level = NGX_CONF_UNSET_UINT; |
412 | |
980 | 413 return conf; |
414 } | |
415 | |
416 | |
417 static char * | |
418 ngx_http_limit_zone_merge_conf(ngx_conf_t *cf, void *parent, void *child) | |
419 { | |
420 ngx_http_limit_zone_conf_t *prev = parent; | |
421 ngx_http_limit_zone_conf_t *conf = child; | |
422 | |
423 if (conf->shm_zone == NULL) { | |
424 *conf = *prev; | |
425 } | |
426 | |
3186 | 427 ngx_conf_merge_uint_value(conf->log_level, prev->log_level, NGX_LOG_ERR); |
428 | |
980 | 429 return NGX_CONF_OK; |
430 } | |
431 | |
432 | |
433 static char * | |
434 ngx_http_limit_zone(ngx_conf_t *cf, ngx_command_t *cmd, void *conf) | |
435 { | |
987 | 436 ssize_t n; |
437 ngx_str_t *value; | |
438 ngx_shm_zone_t *shm_zone; | |
439 ngx_http_limit_zone_ctx_t *ctx; | |
980 | 440 |
441 value = cf->args->elts; | |
442 | |
987 | 443 if (value[2].data[0] != '$') { |
444 ngx_conf_log_error(NGX_LOG_EMERG, cf, 0, | |
445 "invalid variable name \"%V\"", &value[2]); | |
446 return NGX_CONF_ERROR; | |
447 } | |
448 | |
449 value[2].len--; | |
450 value[2].data++; | |
451 | |
452 ctx = ngx_pcalloc(cf->pool, sizeof(ngx_http_limit_zone_ctx_t)); | |
453 if (ctx == NULL) { | |
454 return NGX_CONF_ERROR; | |
455 } | |
456 | |
457 ctx->index = ngx_http_get_variable_index(cf, &value[2]); | |
458 if (ctx->index == NGX_ERROR) { | |
459 return NGX_CONF_ERROR; | |
460 } | |
461 | |
462 ctx->var = value[2]; | |
463 | |
464 n = ngx_parse_size(&value[3]); | |
980 | 465 |
466 if (n == NGX_ERROR) { | |
467 ngx_conf_log_error(NGX_LOG_EMERG, cf, 0, | |
987 | 468 "invalid size of limit_zone \"%V\"", &value[3]); |
980 | 469 return NGX_CONF_ERROR; |
470 } | |
471 | |
472 if (n < (ngx_int_t) (8 * ngx_pagesize)) { | |
473 ngx_conf_log_error(NGX_LOG_EMERG, cf, 0, | |
474 "limit_zone \"%V\" is too small", &value[1]); | |
475 return NGX_CONF_ERROR; | |
476 } | |
477 | |
478 | |
479 shm_zone = ngx_shared_memory_add(cf, &value[1], n, | |
480 &ngx_http_limit_zone_module); | |
481 if (shm_zone == NULL) { | |
482 return NGX_CONF_ERROR; | |
483 } | |
484 | |
987 | 485 if (shm_zone->data) { |
486 ctx = shm_zone->data; | |
487 | |
488 ngx_conf_log_error(NGX_LOG_EMERG, cf, 0, | |
489 "limit_zone \"%V\" is already bound to variable \"%V\"", | |
490 &value[1], &ctx->var); | |
491 return NGX_CONF_ERROR; | |
492 } | |
493 | |
980 | 494 shm_zone->init = ngx_http_limit_zone_init_zone; |
987 | 495 shm_zone->data = ctx; |
980 | 496 |
497 return NGX_CONF_OK; | |
498 } | |
499 | |
500 | |
501 static char * | |
502 ngx_http_limit_conn(ngx_conf_t *cf, ngx_command_t *cmd, void *conf) | |
503 { | |
504 ngx_http_limit_zone_conf_t *lzcf = conf; | |
505 | |
506 ngx_int_t n; | |
507 ngx_str_t *value; | |
508 | |
2372 | 509 if (lzcf->shm_zone) { |
510 return "is duplicate"; | |
511 } | |
512 | |
980 | 513 value = cf->args->elts; |
514 | |
987 | 515 lzcf->shm_zone = ngx_shared_memory_add(cf, &value[1], 0, |
516 &ngx_http_limit_zone_module); | |
517 if (lzcf->shm_zone == NULL) { | |
980 | 518 return NGX_CONF_ERROR; |
519 } | |
520 | |
987 | 521 n = ngx_atoi(value[2].data, value[2].len); |
522 if (n <= 0) { | |
980 | 523 ngx_conf_log_error(NGX_LOG_EMERG, cf, 0, |
987 | 524 "invalid number of connections \"%V\"", &value[2]); |
980 | 525 return NGX_CONF_ERROR; |
526 } | |
527 | |
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528 if (n > 65535) { |
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529 ngx_conf_log_error(NGX_LOG_EMERG, cf, 0, |
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530 "connection limit must be less 65536"); |
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531 return NGX_CONF_ERROR; |
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532 } |
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533 |
980 | 534 lzcf->conn = n; |
535 | |
536 return NGX_CONF_OK; | |
537 } | |
538 | |
539 | |
540 static ngx_int_t | |
541 ngx_http_limit_zone_init(ngx_conf_t *cf) | |
542 { | |
543 ngx_http_handler_pt *h; | |
544 ngx_http_core_main_conf_t *cmcf; | |
545 | |
546 cmcf = ngx_http_conf_get_module_main_conf(cf, ngx_http_core_module); | |
547 | |
548 h = ngx_array_push(&cmcf->phases[NGX_HTTP_PREACCESS_PHASE].handlers); | |
549 if (h == NULL) { | |
550 return NGX_ERROR; | |
551 } | |
552 | |
553 *h = ngx_http_limit_zone_handler; | |
554 | |
555 return NGX_OK; | |
556 } |