Mercurial > hg > nginx
annotate src/http/modules/ngx_http_limit_zone_module.c @ 4440:97995d63aa36 stable-1.0
Merge of r4381, r4400:
Fixed limit_conn_log_level/limit_req_log_level inheritance. The
directives did not work if there were no limit_conn/limit_req
specified on the same level.
The code for limit_conn is different in 1.0.x, conflict resolved
manually.
| author | Maxim Dounin <mdounin@mdounin.ru> |
|---|---|
| date | Sun, 05 Feb 2012 15:47:58 +0000 |
| parents | 23d567eabc5d |
| children | 4919fb357a5d |
| 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 | |
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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) { | |
| 4440 | 424 conf->shm_zone = prev->shm_zone; |
| 425 conf->conn = prev->conn; | |
| 980 | 426 } |
| 427 | |
| 3186 | 428 ngx_conf_merge_uint_value(conf->log_level, prev->log_level, NGX_LOG_ERR); |
| 429 | |
| 980 | 430 return NGX_CONF_OK; |
| 431 } | |
| 432 | |
| 433 | |
| 434 static char * | |
| 435 ngx_http_limit_zone(ngx_conf_t *cf, ngx_command_t *cmd, void *conf) | |
| 436 { | |
| 987 | 437 ssize_t n; |
| 438 ngx_str_t *value; | |
| 439 ngx_shm_zone_t *shm_zone; | |
| 440 ngx_http_limit_zone_ctx_t *ctx; | |
| 980 | 441 |
| 442 value = cf->args->elts; | |
| 443 | |
| 987 | 444 if (value[2].data[0] != '$') { |
| 445 ngx_conf_log_error(NGX_LOG_EMERG, cf, 0, | |
| 446 "invalid variable name \"%V\"", &value[2]); | |
| 447 return NGX_CONF_ERROR; | |
| 448 } | |
| 449 | |
| 450 value[2].len--; | |
| 451 value[2].data++; | |
| 452 | |
| 453 ctx = ngx_pcalloc(cf->pool, sizeof(ngx_http_limit_zone_ctx_t)); | |
| 454 if (ctx == NULL) { | |
| 455 return NGX_CONF_ERROR; | |
| 456 } | |
| 457 | |
| 458 ctx->index = ngx_http_get_variable_index(cf, &value[2]); | |
| 459 if (ctx->index == NGX_ERROR) { | |
| 460 return NGX_CONF_ERROR; | |
| 461 } | |
| 462 | |
| 463 ctx->var = value[2]; | |
| 464 | |
| 465 n = ngx_parse_size(&value[3]); | |
| 980 | 466 |
| 467 if (n == NGX_ERROR) { | |
| 468 ngx_conf_log_error(NGX_LOG_EMERG, cf, 0, | |
| 987 | 469 "invalid size of limit_zone \"%V\"", &value[3]); |
| 980 | 470 return NGX_CONF_ERROR; |
| 471 } | |
| 472 | |
| 473 if (n < (ngx_int_t) (8 * ngx_pagesize)) { | |
| 474 ngx_conf_log_error(NGX_LOG_EMERG, cf, 0, | |
| 475 "limit_zone \"%V\" is too small", &value[1]); | |
| 476 return NGX_CONF_ERROR; | |
| 477 } | |
| 478 | |
| 479 | |
| 480 shm_zone = ngx_shared_memory_add(cf, &value[1], n, | |
| 481 &ngx_http_limit_zone_module); | |
| 482 if (shm_zone == NULL) { | |
| 483 return NGX_CONF_ERROR; | |
| 484 } | |
| 485 | |
| 987 | 486 if (shm_zone->data) { |
| 487 ctx = shm_zone->data; | |
| 488 | |
| 489 ngx_conf_log_error(NGX_LOG_EMERG, cf, 0, | |
| 490 "limit_zone \"%V\" is already bound to variable \"%V\"", | |
| 491 &value[1], &ctx->var); | |
| 492 return NGX_CONF_ERROR; | |
| 493 } | |
| 494 | |
| 980 | 495 shm_zone->init = ngx_http_limit_zone_init_zone; |
| 987 | 496 shm_zone->data = ctx; |
| 980 | 497 |
| 498 return NGX_CONF_OK; | |
| 499 } | |
| 500 | |
| 501 | |
| 502 static char * | |
| 503 ngx_http_limit_conn(ngx_conf_t *cf, ngx_command_t *cmd, void *conf) | |
| 504 { | |
| 505 ngx_http_limit_zone_conf_t *lzcf = conf; | |
| 506 | |
| 507 ngx_int_t n; | |
| 508 ngx_str_t *value; | |
| 509 | |
| 2372 | 510 if (lzcf->shm_zone) { |
| 511 return "is duplicate"; | |
| 512 } | |
| 513 | |
| 980 | 514 value = cf->args->elts; |
| 515 | |
| 987 | 516 lzcf->shm_zone = ngx_shared_memory_add(cf, &value[1], 0, |
| 517 &ngx_http_limit_zone_module); | |
| 518 if (lzcf->shm_zone == NULL) { | |
| 980 | 519 return NGX_CONF_ERROR; |
| 520 } | |
| 521 | |
| 987 | 522 n = ngx_atoi(value[2].data, value[2].len); |
| 523 if (n <= 0) { | |
| 980 | 524 ngx_conf_log_error(NGX_LOG_EMERG, cf, 0, |
| 987 | 525 "invalid number of connections \"%V\"", &value[2]); |
| 980 | 526 return NGX_CONF_ERROR; |
| 527 } | |
| 528 | |
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529 if (n > 65535) { |
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530 ngx_conf_log_error(NGX_LOG_EMERG, cf, 0, |
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531 "connection limit must be less 65536"); |
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532 return NGX_CONF_ERROR; |
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533 } |
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534 |
| 980 | 535 lzcf->conn = n; |
| 536 | |
| 537 return NGX_CONF_OK; | |
| 538 } | |
| 539 | |
| 540 | |
| 541 static ngx_int_t | |
| 542 ngx_http_limit_zone_init(ngx_conf_t *cf) | |
| 543 { | |
| 544 ngx_http_handler_pt *h; | |
| 545 ngx_http_core_main_conf_t *cmcf; | |
| 546 | |
| 547 cmcf = ngx_http_conf_get_module_main_conf(cf, ngx_http_core_module); | |
| 548 | |
| 549 h = ngx_array_push(&cmcf->phases[NGX_HTTP_PREACCESS_PHASE].handlers); | |
| 550 if (h == NULL) { | |
| 551 return NGX_ERROR; | |
| 552 } | |
| 553 | |
| 554 *h = ngx_http_limit_zone_handler; | |
| 555 | |
| 556 return NGX_OK; | |
| 557 } |