Mercurial > hg > nginx
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> |
|---|---|
| date | Sun, 05 Feb 2012 20:02:59 +0000 |
| parents | 97995d63aa36 |
| children | 8bb695c05870 |
| rev | line source |
|---|---|
| 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 | |
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333 ngx_http_limit_zone_init_zone(ngx_shm_zone_t *shm_zone, void *data) |
| 980 | 334 { |
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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 } |