Mercurial > hg > nginx
annotate src/http/modules/ngx_http_limit_conn_module.c @ 7594:359b0ea2b067
Limit conn: limit_conn_dry_run directive.
A new directive limit_conn_dry_run allows enabling the dry run mode. In this
mode connections are not rejected, but reject status is logged as usual.
author | Roman Arutyunyan <arut@nginx.com> |
---|---|
date | Tue, 19 Nov 2019 11:30:41 +0300 |
parents | f01ab2dbcfdc |
children | 9606d93aa586 |
rev | line source |
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980 | 1 |
2 /* | |
3 * Copyright (C) Igor Sysoev | |
4412 | 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 { | |
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14 u_char color; |
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15 u_char len; |
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16 u_short conn; |
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17 u_char data[1]; |
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18 } ngx_http_limit_conn_node_t; |
980 | 19 |
20 | |
21 typedef struct { | |
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22 ngx_shm_zone_t *shm_zone; |
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23 ngx_rbtree_node_t *node; |
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24 } ngx_http_limit_conn_cleanup_t; |
980 | 25 |
26 | |
27 typedef struct { | |
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28 ngx_rbtree_t *rbtree; |
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29 ngx_http_complex_value_t key; |
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30 } ngx_http_limit_conn_ctx_t; |
987 | 31 |
32 | |
33 typedef struct { | |
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34 ngx_shm_zone_t *shm_zone; |
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35 ngx_uint_t conn; |
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36 } ngx_http_limit_conn_limit_t; |
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37 |
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38 |
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39 typedef struct { |
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40 ngx_array_t limits; |
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41 ngx_uint_t log_level; |
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42 ngx_uint_t status_code; |
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43 ngx_flag_t dry_run; |
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44 } ngx_http_limit_conn_conf_t; |
980 | 45 |
46 | |
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47 static ngx_rbtree_node_t *ngx_http_limit_conn_lookup(ngx_rbtree_t *rbtree, |
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48 ngx_str_t *key, uint32_t hash); |
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49 static void ngx_http_limit_conn_cleanup(void *data); |
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50 static ngx_inline void ngx_http_limit_conn_cleanup_all(ngx_pool_t *pool); |
980 | 51 |
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52 static void *ngx_http_limit_conn_create_conf(ngx_conf_t *cf); |
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53 static char *ngx_http_limit_conn_merge_conf(ngx_conf_t *cf, void *parent, |
980 | 54 void *child); |
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55 static char *ngx_http_limit_conn_zone(ngx_conf_t *cf, ngx_command_t *cmd, |
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56 void *conf); |
980 | 57 static char *ngx_http_limit_conn(ngx_conf_t *cf, ngx_command_t *cmd, |
58 void *conf); | |
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59 static ngx_int_t ngx_http_limit_conn_init(ngx_conf_t *cf); |
980 | 60 |
61 | |
3186 | 62 static ngx_conf_enum_t ngx_http_limit_conn_log_levels[] = { |
63 { ngx_string("info"), NGX_LOG_INFO }, | |
64 { ngx_string("notice"), NGX_LOG_NOTICE }, | |
65 { ngx_string("warn"), NGX_LOG_WARN }, | |
66 { ngx_string("error"), NGX_LOG_ERR }, | |
67 { ngx_null_string, 0 } | |
68 }; | |
69 | |
70 | |
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71 static ngx_conf_num_bounds_t ngx_http_limit_conn_status_bounds = { |
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72 ngx_conf_check_num_bounds, 400, 599 |
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73 }; |
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74 |
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75 |
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76 static ngx_command_t ngx_http_limit_conn_commands[] = { |
980 | 77 |
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78 { ngx_string("limit_conn_zone"), |
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79 NGX_HTTP_MAIN_CONF|NGX_CONF_TAKE2, |
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80 ngx_http_limit_conn_zone, |
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81 0, |
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82 0, |
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83 NULL }, |
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84 |
980 | 85 { ngx_string("limit_conn"), |
987 | 86 NGX_HTTP_MAIN_CONF|NGX_HTTP_SRV_CONF|NGX_HTTP_LOC_CONF|NGX_CONF_TAKE2, |
980 | 87 ngx_http_limit_conn, |
88 NGX_HTTP_LOC_CONF_OFFSET, | |
89 0, | |
90 NULL }, | |
91 | |
3186 | 92 { ngx_string("limit_conn_log_level"), |
93 NGX_HTTP_MAIN_CONF|NGX_HTTP_SRV_CONF|NGX_HTTP_LOC_CONF|NGX_CONF_TAKE1, | |
94 ngx_conf_set_enum_slot, | |
95 NGX_HTTP_LOC_CONF_OFFSET, | |
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96 offsetof(ngx_http_limit_conn_conf_t, log_level), |
3186 | 97 &ngx_http_limit_conn_log_levels }, |
98 | |
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99 { ngx_string("limit_conn_status"), |
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100 NGX_HTTP_MAIN_CONF|NGX_HTTP_SRV_CONF|NGX_HTTP_LOC_CONF|NGX_CONF_TAKE1, |
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101 ngx_conf_set_num_slot, |
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102 NGX_HTTP_LOC_CONF_OFFSET, |
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103 offsetof(ngx_http_limit_conn_conf_t, status_code), |
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104 &ngx_http_limit_conn_status_bounds }, |
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105 |
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106 { ngx_string("limit_conn_dry_run"), |
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107 NGX_HTTP_MAIN_CONF|NGX_HTTP_SRV_CONF|NGX_HTTP_LOC_CONF|NGX_CONF_FLAG, |
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108 ngx_conf_set_flag_slot, |
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109 NGX_HTTP_LOC_CONF_OFFSET, |
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110 offsetof(ngx_http_limit_conn_conf_t, dry_run), |
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111 NULL }, |
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112 |
980 | 113 ngx_null_command |
114 }; | |
115 | |
116 | |
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117 static ngx_http_module_t ngx_http_limit_conn_module_ctx = { |
980 | 118 NULL, /* preconfiguration */ |
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119 ngx_http_limit_conn_init, /* postconfiguration */ |
980 | 120 |
121 NULL, /* create main configuration */ | |
122 NULL, /* init main configuration */ | |
123 | |
124 NULL, /* create server configuration */ | |
125 NULL, /* merge server configuration */ | |
126 | |
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127 ngx_http_limit_conn_create_conf, /* create location configuration */ |
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128 ngx_http_limit_conn_merge_conf /* merge location configuration */ |
980 | 129 }; |
130 | |
131 | |
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132 ngx_module_t ngx_http_limit_conn_module = { |
980 | 133 NGX_MODULE_V1, |
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134 &ngx_http_limit_conn_module_ctx, /* module context */ |
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135 ngx_http_limit_conn_commands, /* module directives */ |
980 | 136 NGX_HTTP_MODULE, /* module type */ |
137 NULL, /* init master */ | |
138 NULL, /* init module */ | |
139 NULL, /* init process */ | |
140 NULL, /* init thread */ | |
141 NULL, /* exit thread */ | |
142 NULL, /* exit process */ | |
143 NULL, /* exit master */ | |
144 NGX_MODULE_V1_PADDING | |
145 }; | |
146 | |
147 | |
148 static ngx_int_t | |
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149 ngx_http_limit_conn_handler(ngx_http_request_t *r) |
980 | 150 { |
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151 size_t n; |
980 | 152 uint32_t hash; |
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153 ngx_str_t key; |
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154 ngx_uint_t i; |
980 | 155 ngx_slab_pool_t *shpool; |
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156 ngx_rbtree_node_t *node; |
980 | 157 ngx_pool_cleanup_t *cln; |
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158 ngx_http_limit_conn_ctx_t *ctx; |
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159 ngx_http_limit_conn_node_t *lc; |
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160 ngx_http_limit_conn_conf_t *lccf; |
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161 ngx_http_limit_conn_limit_t *limits; |
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162 ngx_http_limit_conn_cleanup_t *lccln; |
980 | 163 |
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164 if (r->main->limit_conn_set) { |
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165 return NGX_DECLINED; |
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166 } |
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167 |
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168 lccf = ngx_http_get_module_loc_conf(r, ngx_http_limit_conn_module); |
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169 limits = lccf->limits.elts; |
980 | 170 |
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171 for (i = 0; i < lccf->limits.nelts; i++) { |
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172 ctx = limits[i].shm_zone->data; |
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173 |
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174 if (ngx_http_complex_value(r, &ctx->key, &key) != NGX_OK) { |
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175 return NGX_HTTP_INTERNAL_SERVER_ERROR; |
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176 } |
980 | 177 |
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178 if (key.len == 0) { |
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179 continue; |
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180 } |
980 | 181 |
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182 if (key.len > 255) { |
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183 ngx_log_error(NGX_LOG_ERR, r->connection->log, 0, |
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184 "the value of the \"%V\" key " |
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185 "is more than 255 bytes: \"%V\"", |
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186 &ctx->key.value, &key); |
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187 continue; |
980 | 188 } |
189 | |
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190 r->main->limit_conn_set = 1; |
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191 |
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192 hash = ngx_crc32_short(key.data, key.len); |
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193 |
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194 shpool = (ngx_slab_pool_t *) limits[i].shm_zone->shm.addr; |
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195 |
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196 ngx_shmtx_lock(&shpool->mutex); |
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197 |
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198 node = ngx_http_limit_conn_lookup(ctx->rbtree, &key, hash); |
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199 |
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200 if (node == NULL) { |
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201 |
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202 n = offsetof(ngx_rbtree_node_t, color) |
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203 + offsetof(ngx_http_limit_conn_node_t, data) |
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204 + key.len; |
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205 |
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206 node = ngx_slab_alloc_locked(shpool, n); |
980 | 207 |
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208 if (node == NULL) { |
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209 ngx_shmtx_unlock(&shpool->mutex); |
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210 ngx_http_limit_conn_cleanup_all(r->pool); |
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211 |
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212 if (lccf->dry_run) { |
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213 return NGX_DECLINED; |
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214 } |
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215 |
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216 return lccf->status_code; |
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217 } |
2373 | 218 |
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219 lc = (ngx_http_limit_conn_node_t *) &node->color; |
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220 |
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221 node->key = hash; |
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222 lc->len = (u_char) key.len; |
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223 lc->conn = 1; |
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224 ngx_memcpy(lc->data, key.data, key.len); |
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225 |
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226 ngx_rbtree_insert(ctx->rbtree, node); |
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227 |
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228 } else { |
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229 |
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230 lc = (ngx_http_limit_conn_node_t *) &node->color; |
980 | 231 |
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232 if ((ngx_uint_t) lc->conn >= limits[i].conn) { |
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233 |
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234 ngx_shmtx_unlock(&shpool->mutex); |
980 | 235 |
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236 ngx_log_error(lccf->log_level, r->connection->log, 0, |
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237 "limiting connections%s by zone \"%V\"", |
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238 lccf->dry_run ? ", dry run," : "", |
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239 &limits[i].shm_zone->shm.name); |
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240 |
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241 ngx_http_limit_conn_cleanup_all(r->pool); |
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242 |
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243 if (lccf->dry_run) { |
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244 return NGX_DECLINED; |
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245 } |
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246 |
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247 return lccf->status_code; |
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248 } |
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249 |
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250 lc->conn++; |
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251 } |
980 | 252 |
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253 ngx_log_debug2(NGX_LOG_DEBUG_HTTP, r->connection->log, 0, |
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980 | 255 |
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256 ngx_shmtx_unlock(&shpool->mutex); |
980 | 257 |
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258 cln = ngx_pool_cleanup_add(r->pool, |
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259 sizeof(ngx_http_limit_conn_cleanup_t)); |
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260 if (cln == NULL) { |
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261 return NGX_HTTP_INTERNAL_SERVER_ERROR; |
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262 } |
980 | 263 |
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264 cln->handler = ngx_http_limit_conn_cleanup; |
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265 lccln = cln->data; |
980 | 266 |
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267 lccln->shm_zone = limits[i].shm_zone; |
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268 lccln->node = node; |
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269 } |
980 | 270 |
271 return NGX_DECLINED; | |
272 } | |
273 | |
274 | |
275 static void | |
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276 ngx_http_limit_conn_rbtree_insert_value(ngx_rbtree_node_t *temp, |
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277 ngx_rbtree_node_t *node, ngx_rbtree_node_t *sentinel) |
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278 { |
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279 ngx_rbtree_node_t **p; |
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280 ngx_http_limit_conn_node_t *lcn, *lcnt; |
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281 |
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282 for ( ;; ) { |
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283 |
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284 if (node->key < temp->key) { |
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285 |
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286 p = &temp->left; |
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287 |
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288 } else if (node->key > temp->key) { |
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289 |
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290 p = &temp->right; |
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291 |
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292 } else { /* node->key == temp->key */ |
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293 |
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294 lcn = (ngx_http_limit_conn_node_t *) &node->color; |
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295 lcnt = (ngx_http_limit_conn_node_t *) &temp->color; |
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296 |
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297 p = (ngx_memn2cmp(lcn->data, lcnt->data, lcn->len, lcnt->len) < 0) |
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298 ? &temp->left : &temp->right; |
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299 } |
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300 |
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301 if (*p == sentinel) { |
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302 break; |
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303 } |
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304 |
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305 temp = *p; |
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306 } |
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307 |
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308 *p = node; |
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309 node->parent = temp; |
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310 node->left = sentinel; |
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311 node->right = sentinel; |
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312 ngx_rbt_red(node); |
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313 } |
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314 |
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315 |
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316 static ngx_rbtree_node_t * |
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317 ngx_http_limit_conn_lookup(ngx_rbtree_t *rbtree, ngx_str_t *key, uint32_t hash) |
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318 { |
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319 ngx_int_t rc; |
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320 ngx_rbtree_node_t *node, *sentinel; |
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321 ngx_http_limit_conn_node_t *lcn; |
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322 |
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323 node = rbtree->root; |
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324 sentinel = rbtree->sentinel; |
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325 |
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326 while (node != sentinel) { |
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327 |
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328 if (hash < node->key) { |
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329 node = node->left; |
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330 continue; |
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331 } |
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332 |
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333 if (hash > node->key) { |
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334 node = node->right; |
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335 continue; |
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336 } |
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337 |
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338 /* hash == node->key */ |
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339 |
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340 lcn = (ngx_http_limit_conn_node_t *) &node->color; |
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341 |
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342 rc = ngx_memn2cmp(key->data, lcn->data, key->len, (size_t) lcn->len); |
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343 |
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344 if (rc == 0) { |
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345 return node; |
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346 } |
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347 |
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348 node = (rc < 0) ? node->left : node->right; |
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349 } |
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350 |
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351 return NULL; |
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352 } |
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353 |
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354 |
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355 static void |
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356 ngx_http_limit_conn_cleanup(void *data) |
980 | 357 { |
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358 ngx_http_limit_conn_cleanup_t *lccln = data; |
980 | 359 |
360 ngx_slab_pool_t *shpool; | |
361 ngx_rbtree_node_t *node; | |
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362 ngx_http_limit_conn_ctx_t *ctx; |
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363 ngx_http_limit_conn_node_t *lc; |
980 | 364 |
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365 ctx = lccln->shm_zone->data; |
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366 shpool = (ngx_slab_pool_t *) lccln->shm_zone->shm.addr; |
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367 node = lccln->node; |
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368 lc = (ngx_http_limit_conn_node_t *) &node->color; |
980 | 369 |
370 ngx_shmtx_lock(&shpool->mutex); | |
371 | |
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372 ngx_log_debug2(NGX_LOG_DEBUG_HTTP, lccln->shm_zone->shm.log, 0, |
6480 | 373 "limit conn cleanup: %08Xi %d", node->key, lc->conn); |
980 | 374 |
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375 lc->conn--; |
980 | 376 |
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377 if (lc->conn == 0) { |
987 | 378 ngx_rbtree_delete(ctx->rbtree, node); |
980 | 379 ngx_slab_free_locked(shpool, node); |
380 } | |
381 | |
382 ngx_shmtx_unlock(&shpool->mutex); | |
383 } | |
384 | |
385 | |
4271
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386 static ngx_inline void |
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387 ngx_http_limit_conn_cleanup_all(ngx_pool_t *pool) |
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388 { |
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389 ngx_pool_cleanup_t *cln; |
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390 |
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391 cln = pool->cleanup; |
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392 |
4280
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Renamed ngx_http_limit_zone_module to ngx_http_limit_conn_module.
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|
393 while (cln && cln->handler == ngx_http_limit_conn_cleanup) { |
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|
394 ngx_http_limit_conn_cleanup(cln->data); |
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|
395 cln = cln->next; |
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Limit zone: support for multiple "limit_conn" limits.
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|
396 } |
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|
397 |
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398 pool->cleanup = cln; |
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|
399 } |
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|
400 |
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Limit zone: support for multiple "limit_conn" limits.
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401 |
980 | 402 static ngx_int_t |
4280
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Renamed ngx_http_limit_zone_module to ngx_http_limit_conn_module.
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changeset
|
403 ngx_http_limit_conn_init_zone(ngx_shm_zone_t *shm_zone, void *data) |
980 | 404 { |
4280
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Renamed ngx_http_limit_zone_module to ngx_http_limit_conn_module.
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|
405 ngx_http_limit_conn_ctx_t *octx = data; |
993
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pass the inherited shm_zone data
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diff
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|
406 |
2611
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improve ngx_slab_alloc() error logging
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parents:
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diff
changeset
|
407 size_t len; |
987 | 408 ngx_slab_pool_t *shpool; |
409 ngx_rbtree_node_t *sentinel; | |
4280
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Renamed ngx_http_limit_zone_module to ngx_http_limit_conn_module.
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changeset
|
410 ngx_http_limit_conn_ctx_t *ctx; |
980 | 411 |
993
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pass the inherited shm_zone data
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diff
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412 ctx = shm_zone->data; |
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413 |
1b9a4d92173f
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|
414 if (octx) { |
5860
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Limit conn: use complex value in limit_conn_zone (ticket #121).
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|
415 if (ctx->key.value.len != octx->key.value.len |
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Limit conn: use complex value in limit_conn_zone (ticket #121).
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416 || ngx_strncmp(ctx->key.value.data, octx->key.value.data, |
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Limit conn: use complex value in limit_conn_zone (ticket #121).
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|
417 ctx->key.value.len) |
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Limit conn: use complex value in limit_conn_zone (ticket #121).
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|
418 != 0) |
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Limit conn: use complex value in limit_conn_zone (ticket #121).
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|
419 { |
993
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|
420 ngx_log_error(NGX_LOG_EMERG, shm_zone->shm.log, 0, |
5860
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Limit conn: use complex value in limit_conn_zone (ticket #121).
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diff
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|
421 "limit_conn_zone \"%V\" uses the \"%V\" key " |
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Limit conn: use complex value in limit_conn_zone (ticket #121).
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|
422 "while previously it used the \"%V\" key", |
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Limit conn: use complex value in limit_conn_zone (ticket #121).
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diff
changeset
|
423 &shm_zone->shm.name, &ctx->key.value, |
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Limit conn: use complex value in limit_conn_zone (ticket #121).
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changeset
|
424 &octx->key.value); |
993
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pass the inherited shm_zone data
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diff
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|
425 return NGX_ERROR; |
1b9a4d92173f
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987
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|
426 } |
1b9a4d92173f
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|
427 |
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changeset
|
428 ctx->rbtree = octx->rbtree; |
1b9a4d92173f
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|
429 |
1b9a4d92173f
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diff
changeset
|
430 return NGX_OK; |
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987
diff
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|
431 } |
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987
diff
changeset
|
432 |
980 | 433 shpool = (ngx_slab_pool_t *) shm_zone->shm.addr; |
434 | |
2720
b3b8c66bd520
support attaching to an existent Win32 shared memory
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2716
diff
changeset
|
435 if (shm_zone->shm.exists) { |
b3b8c66bd520
support attaching to an existent Win32 shared memory
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2716
diff
changeset
|
436 ctx->rbtree = shpool->data; |
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support attaching to an existent Win32 shared memory
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diff
changeset
|
437 |
b3b8c66bd520
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2716
diff
changeset
|
438 return NGX_OK; |
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support attaching to an existent Win32 shared memory
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parents:
2716
diff
changeset
|
439 } |
b3b8c66bd520
support attaching to an existent Win32 shared memory
Igor Sysoev <igor@sysoev.ru>
parents:
2716
diff
changeset
|
440 |
987 | 441 ctx->rbtree = ngx_slab_alloc(shpool, sizeof(ngx_rbtree_t)); |
442 if (ctx->rbtree == NULL) { | |
980 | 443 return NGX_ERROR; |
444 } | |
445 | |
2720
b3b8c66bd520
support attaching to an existent Win32 shared memory
Igor Sysoev <igor@sysoev.ru>
parents:
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diff
changeset
|
446 shpool->data = ctx->rbtree; |
b3b8c66bd520
support attaching to an existent Win32 shared memory
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2716
diff
changeset
|
447 |
980 | 448 sentinel = ngx_slab_alloc(shpool, sizeof(ngx_rbtree_node_t)); |
449 if (sentinel == NULL) { | |
450 return NGX_ERROR; | |
451 } | |
452 | |
1743
4fc402c3ec73
optimize rbtree initialization and insert
Igor Sysoev <igor@sysoev.ru>
parents:
1406
diff
changeset
|
453 ngx_rbtree_init(ctx->rbtree, sentinel, |
4280
91874133fb27
Renamed ngx_http_limit_zone_module to ngx_http_limit_conn_module.
Valentin Bartenev <vbart@nginx.com>
parents:
4272
diff
changeset
|
454 ngx_http_limit_conn_rbtree_insert_value); |
980 | 455 |
4272
260d591cb6a3
Limit zone: added the "limit_conn_zone" directive.
Valentin Bartenev <vbart@nginx.com>
parents:
4271
diff
changeset
|
456 len = sizeof(" in limit_conn_zone \"\"") + shm_zone->shm.name.len; |
2611
2bce3f6416c6
improve ngx_slab_alloc() error logging
Igor Sysoev <igor@sysoev.ru>
parents:
2373
diff
changeset
|
457 |
2bce3f6416c6
improve ngx_slab_alloc() error logging
Igor Sysoev <igor@sysoev.ru>
parents:
2373
diff
changeset
|
458 shpool->log_ctx = ngx_slab_alloc(shpool, len); |
2bce3f6416c6
improve ngx_slab_alloc() error logging
Igor Sysoev <igor@sysoev.ru>
parents:
2373
diff
changeset
|
459 if (shpool->log_ctx == NULL) { |
2bce3f6416c6
improve ngx_slab_alloc() error logging
Igor Sysoev <igor@sysoev.ru>
parents:
2373
diff
changeset
|
460 return NGX_ERROR; |
2bce3f6416c6
improve ngx_slab_alloc() error logging
Igor Sysoev <igor@sysoev.ru>
parents:
2373
diff
changeset
|
461 } |
2bce3f6416c6
improve ngx_slab_alloc() error logging
Igor Sysoev <igor@sysoev.ru>
parents:
2373
diff
changeset
|
462 |
4272
260d591cb6a3
Limit zone: added the "limit_conn_zone" directive.
Valentin Bartenev <vbart@nginx.com>
parents:
4271
diff
changeset
|
463 ngx_sprintf(shpool->log_ctx, " in limit_conn_zone \"%V\"%Z", |
2716
d5896f6608e8
move zone name from ngx_shm_zone_t to ngx_shm_t to use Win32 shared memory
Igor Sysoev <igor@sysoev.ru>
parents:
2612
diff
changeset
|
464 &shm_zone->shm.name); |
2611
2bce3f6416c6
improve ngx_slab_alloc() error logging
Igor Sysoev <igor@sysoev.ru>
parents:
2373
diff
changeset
|
465 |
980 | 466 return NGX_OK; |
467 } | |
468 | |
469 | |
470 static void * | |
4280
91874133fb27
Renamed ngx_http_limit_zone_module to ngx_http_limit_conn_module.
Valentin Bartenev <vbart@nginx.com>
parents:
4272
diff
changeset
|
471 ngx_http_limit_conn_create_conf(ngx_conf_t *cf) |
980 | 472 { |
4280
91874133fb27
Renamed ngx_http_limit_zone_module to ngx_http_limit_conn_module.
Valentin Bartenev <vbart@nginx.com>
parents:
4272
diff
changeset
|
473 ngx_http_limit_conn_conf_t *conf; |
980 | 474 |
4280
91874133fb27
Renamed ngx_http_limit_zone_module to ngx_http_limit_conn_module.
Valentin Bartenev <vbart@nginx.com>
parents:
4272
diff
changeset
|
475 conf = ngx_pcalloc(cf->pool, sizeof(ngx_http_limit_conn_conf_t)); |
980 | 476 if (conf == NULL) { |
2912
c7d57b539248
return NULL instead of NGX_CONF_ERROR on a create conf failure
Igor Sysoev <igor@sysoev.ru>
parents:
2720
diff
changeset
|
477 return NULL; |
980 | 478 } |
479 | |
480 /* | |
481 * set by ngx_pcalloc(): | |
482 * | |
4271
b86cceba426a
Limit zone: support for multiple "limit_conn" limits.
Valentin Bartenev <vbart@nginx.com>
parents:
4270
diff
changeset
|
483 * conf->limits.elts = NULL; |
980 | 484 */ |
485 | |
3186 | 486 conf->log_level = NGX_CONF_UNSET_UINT; |
5117
00e4459739ed
The limit_req_status and limit_conn_status directives.
Maxim Dounin <mdounin@mdounin.ru>
parents:
4972
diff
changeset
|
487 conf->status_code = NGX_CONF_UNSET_UINT; |
7594
359b0ea2b067
Limit conn: limit_conn_dry_run directive.
Roman Arutyunyan <arut@nginx.com>
parents:
6480
diff
changeset
|
488 conf->dry_run = NGX_CONF_UNSET; |
3186 | 489 |
980 | 490 return conf; |
491 } | |
492 | |
493 | |
494 static char * | |
4280
91874133fb27
Renamed ngx_http_limit_zone_module to ngx_http_limit_conn_module.
Valentin Bartenev <vbart@nginx.com>
parents:
4272
diff
changeset
|
495 ngx_http_limit_conn_merge_conf(ngx_conf_t *cf, void *parent, void *child) |
980 | 496 { |
4280
91874133fb27
Renamed ngx_http_limit_zone_module to ngx_http_limit_conn_module.
Valentin Bartenev <vbart@nginx.com>
parents:
4272
diff
changeset
|
497 ngx_http_limit_conn_conf_t *prev = parent; |
91874133fb27
Renamed ngx_http_limit_zone_module to ngx_http_limit_conn_module.
Valentin Bartenev <vbart@nginx.com>
parents:
4272
diff
changeset
|
498 ngx_http_limit_conn_conf_t *conf = child; |
980 | 499 |
4271
b86cceba426a
Limit zone: support for multiple "limit_conn" limits.
Valentin Bartenev <vbart@nginx.com>
parents:
4270
diff
changeset
|
500 if (conf->limits.elts == NULL) { |
4380
7697412a0921
Fixed limit_conn_log_level/limit_req_log_level inheritance.
Valentin Bartenev <vbart@nginx.com>
parents:
4280
diff
changeset
|
501 conf->limits = prev->limits; |
980 | 502 } |
503 | |
3186 | 504 ngx_conf_merge_uint_value(conf->log_level, prev->log_level, NGX_LOG_ERR); |
5117
00e4459739ed
The limit_req_status and limit_conn_status directives.
Maxim Dounin <mdounin@mdounin.ru>
parents:
4972
diff
changeset
|
505 ngx_conf_merge_uint_value(conf->status_code, prev->status_code, |
00e4459739ed
The limit_req_status and limit_conn_status directives.
Maxim Dounin <mdounin@mdounin.ru>
parents:
4972
diff
changeset
|
506 NGX_HTTP_SERVICE_UNAVAILABLE); |
3186 | 507 |
7594
359b0ea2b067
Limit conn: limit_conn_dry_run directive.
Roman Arutyunyan <arut@nginx.com>
parents:
6480
diff
changeset
|
508 ngx_conf_merge_value(conf->dry_run, prev->dry_run, 0); |
359b0ea2b067
Limit conn: limit_conn_dry_run directive.
Roman Arutyunyan <arut@nginx.com>
parents:
6480
diff
changeset
|
509 |
980 | 510 return NGX_CONF_OK; |
511 } | |
512 | |
513 | |
514 static char * | |
4272
260d591cb6a3
Limit zone: added the "limit_conn_zone" directive.
Valentin Bartenev <vbart@nginx.com>
parents:
4271
diff
changeset
|
515 ngx_http_limit_conn_zone(ngx_conf_t *cf, ngx_command_t *cmd, void *conf) |
260d591cb6a3
Limit zone: added the "limit_conn_zone" directive.
Valentin Bartenev <vbart@nginx.com>
parents:
4271
diff
changeset
|
516 { |
5860
c9787372f16d
Limit conn: use complex value in limit_conn_zone (ticket #121).
Valentin Bartenev <vbart@nginx.com>
parents:
5859
diff
changeset
|
517 u_char *p; |
c9787372f16d
Limit conn: use complex value in limit_conn_zone (ticket #121).
Valentin Bartenev <vbart@nginx.com>
parents:
5859
diff
changeset
|
518 ssize_t size; |
c9787372f16d
Limit conn: use complex value in limit_conn_zone (ticket #121).
Valentin Bartenev <vbart@nginx.com>
parents:
5859
diff
changeset
|
519 ngx_str_t *value, name, s; |
c9787372f16d
Limit conn: use complex value in limit_conn_zone (ticket #121).
Valentin Bartenev <vbart@nginx.com>
parents:
5859
diff
changeset
|
520 ngx_uint_t i; |
c9787372f16d
Limit conn: use complex value in limit_conn_zone (ticket #121).
Valentin Bartenev <vbart@nginx.com>
parents:
5859
diff
changeset
|
521 ngx_shm_zone_t *shm_zone; |
c9787372f16d
Limit conn: use complex value in limit_conn_zone (ticket #121).
Valentin Bartenev <vbart@nginx.com>
parents:
5859
diff
changeset
|
522 ngx_http_limit_conn_ctx_t *ctx; |
c9787372f16d
Limit conn: use complex value in limit_conn_zone (ticket #121).
Valentin Bartenev <vbart@nginx.com>
parents:
5859
diff
changeset
|
523 ngx_http_compile_complex_value_t ccv; |
4272
260d591cb6a3
Limit zone: added the "limit_conn_zone" directive.
Valentin Bartenev <vbart@nginx.com>
parents:
4271
diff
changeset
|
524 |
260d591cb6a3
Limit zone: added the "limit_conn_zone" directive.
Valentin Bartenev <vbart@nginx.com>
parents:
4271
diff
changeset
|
525 value = cf->args->elts; |
260d591cb6a3
Limit zone: added the "limit_conn_zone" directive.
Valentin Bartenev <vbart@nginx.com>
parents:
4271
diff
changeset
|
526 |
5860
c9787372f16d
Limit conn: use complex value in limit_conn_zone (ticket #121).
Valentin Bartenev <vbart@nginx.com>
parents:
5859
diff
changeset
|
527 ctx = ngx_pcalloc(cf->pool, sizeof(ngx_http_limit_conn_ctx_t)); |
c9787372f16d
Limit conn: use complex value in limit_conn_zone (ticket #121).
Valentin Bartenev <vbart@nginx.com>
parents:
5859
diff
changeset
|
528 if (ctx == NULL) { |
c9787372f16d
Limit conn: use complex value in limit_conn_zone (ticket #121).
Valentin Bartenev <vbart@nginx.com>
parents:
5859
diff
changeset
|
529 return NGX_CONF_ERROR; |
c9787372f16d
Limit conn: use complex value in limit_conn_zone (ticket #121).
Valentin Bartenev <vbart@nginx.com>
parents:
5859
diff
changeset
|
530 } |
c9787372f16d
Limit conn: use complex value in limit_conn_zone (ticket #121).
Valentin Bartenev <vbart@nginx.com>
parents:
5859
diff
changeset
|
531 |
c9787372f16d
Limit conn: use complex value in limit_conn_zone (ticket #121).
Valentin Bartenev <vbart@nginx.com>
parents:
5859
diff
changeset
|
532 ngx_memzero(&ccv, sizeof(ngx_http_compile_complex_value_t)); |
c9787372f16d
Limit conn: use complex value in limit_conn_zone (ticket #121).
Valentin Bartenev <vbart@nginx.com>
parents:
5859
diff
changeset
|
533 |
c9787372f16d
Limit conn: use complex value in limit_conn_zone (ticket #121).
Valentin Bartenev <vbart@nginx.com>
parents:
5859
diff
changeset
|
534 ccv.cf = cf; |
c9787372f16d
Limit conn: use complex value in limit_conn_zone (ticket #121).
Valentin Bartenev <vbart@nginx.com>
parents:
5859
diff
changeset
|
535 ccv.value = &value[1]; |
c9787372f16d
Limit conn: use complex value in limit_conn_zone (ticket #121).
Valentin Bartenev <vbart@nginx.com>
parents:
5859
diff
changeset
|
536 ccv.complex_value = &ctx->key; |
c9787372f16d
Limit conn: use complex value in limit_conn_zone (ticket #121).
Valentin Bartenev <vbart@nginx.com>
parents:
5859
diff
changeset
|
537 |
c9787372f16d
Limit conn: use complex value in limit_conn_zone (ticket #121).
Valentin Bartenev <vbart@nginx.com>
parents:
5859
diff
changeset
|
538 if (ngx_http_compile_complex_value(&ccv) != NGX_OK) { |
c9787372f16d
Limit conn: use complex value in limit_conn_zone (ticket #121).
Valentin Bartenev <vbart@nginx.com>
parents:
5859
diff
changeset
|
539 return NGX_CONF_ERROR; |
c9787372f16d
Limit conn: use complex value in limit_conn_zone (ticket #121).
Valentin Bartenev <vbart@nginx.com>
parents:
5859
diff
changeset
|
540 } |
c9787372f16d
Limit conn: use complex value in limit_conn_zone (ticket #121).
Valentin Bartenev <vbart@nginx.com>
parents:
5859
diff
changeset
|
541 |
4272
260d591cb6a3
Limit zone: added the "limit_conn_zone" directive.
Valentin Bartenev <vbart@nginx.com>
parents:
4271
diff
changeset
|
542 size = 0; |
260d591cb6a3
Limit zone: added the "limit_conn_zone" directive.
Valentin Bartenev <vbart@nginx.com>
parents:
4271
diff
changeset
|
543 name.len = 0; |
260d591cb6a3
Limit zone: added the "limit_conn_zone" directive.
Valentin Bartenev <vbart@nginx.com>
parents:
4271
diff
changeset
|
544 |
5860
c9787372f16d
Limit conn: use complex value in limit_conn_zone (ticket #121).
Valentin Bartenev <vbart@nginx.com>
parents:
5859
diff
changeset
|
545 for (i = 2; i < cf->args->nelts; i++) { |
4272
260d591cb6a3
Limit zone: added the "limit_conn_zone" directive.
Valentin Bartenev <vbart@nginx.com>
parents:
4271
diff
changeset
|
546 |
260d591cb6a3
Limit zone: added the "limit_conn_zone" directive.
Valentin Bartenev <vbart@nginx.com>
parents:
4271
diff
changeset
|
547 if (ngx_strncmp(value[i].data, "zone=", 5) == 0) { |
260d591cb6a3
Limit zone: added the "limit_conn_zone" directive.
Valentin Bartenev <vbart@nginx.com>
parents:
4271
diff
changeset
|
548 |
260d591cb6a3
Limit zone: added the "limit_conn_zone" directive.
Valentin Bartenev <vbart@nginx.com>
parents:
4271
diff
changeset
|
549 name.data = value[i].data + 5; |
260d591cb6a3
Limit zone: added the "limit_conn_zone" directive.
Valentin Bartenev <vbart@nginx.com>
parents:
4271
diff
changeset
|
550 |
260d591cb6a3
Limit zone: added the "limit_conn_zone" directive.
Valentin Bartenev <vbart@nginx.com>
parents:
4271
diff
changeset
|
551 p = (u_char *) ngx_strchr(name.data, ':'); |
260d591cb6a3
Limit zone: added the "limit_conn_zone" directive.
Valentin Bartenev <vbart@nginx.com>
parents:
4271
diff
changeset
|
552 |
260d591cb6a3
Limit zone: added the "limit_conn_zone" directive.
Valentin Bartenev <vbart@nginx.com>
parents:
4271
diff
changeset
|
553 if (p == NULL) { |
260d591cb6a3
Limit zone: added the "limit_conn_zone" directive.
Valentin Bartenev <vbart@nginx.com>
parents:
4271
diff
changeset
|
554 ngx_conf_log_error(NGX_LOG_EMERG, cf, 0, |
260d591cb6a3
Limit zone: added the "limit_conn_zone" directive.
Valentin Bartenev <vbart@nginx.com>
parents:
4271
diff
changeset
|
555 "invalid zone size \"%V\"", &value[i]); |
260d591cb6a3
Limit zone: added the "limit_conn_zone" directive.
Valentin Bartenev <vbart@nginx.com>
parents:
4271
diff
changeset
|
556 return NGX_CONF_ERROR; |
260d591cb6a3
Limit zone: added the "limit_conn_zone" directive.
Valentin Bartenev <vbart@nginx.com>
parents:
4271
diff
changeset
|
557 } |
260d591cb6a3
Limit zone: added the "limit_conn_zone" directive.
Valentin Bartenev <vbart@nginx.com>
parents:
4271
diff
changeset
|
558 |
260d591cb6a3
Limit zone: added the "limit_conn_zone" directive.
Valentin Bartenev <vbart@nginx.com>
parents:
4271
diff
changeset
|
559 name.len = p - name.data; |
260d591cb6a3
Limit zone: added the "limit_conn_zone" directive.
Valentin Bartenev <vbart@nginx.com>
parents:
4271
diff
changeset
|
560 |
260d591cb6a3
Limit zone: added the "limit_conn_zone" directive.
Valentin Bartenev <vbart@nginx.com>
parents:
4271
diff
changeset
|
561 s.data = p + 1; |
260d591cb6a3
Limit zone: added the "limit_conn_zone" directive.
Valentin Bartenev <vbart@nginx.com>
parents:
4271
diff
changeset
|
562 s.len = value[i].data + value[i].len - s.data; |
260d591cb6a3
Limit zone: added the "limit_conn_zone" directive.
Valentin Bartenev <vbart@nginx.com>
parents:
4271
diff
changeset
|
563 |
260d591cb6a3
Limit zone: added the "limit_conn_zone" directive.
Valentin Bartenev <vbart@nginx.com>
parents:
4271
diff
changeset
|
564 size = ngx_parse_size(&s); |
260d591cb6a3
Limit zone: added the "limit_conn_zone" directive.
Valentin Bartenev <vbart@nginx.com>
parents:
4271
diff
changeset
|
565 |
260d591cb6a3
Limit zone: added the "limit_conn_zone" directive.
Valentin Bartenev <vbart@nginx.com>
parents:
4271
diff
changeset
|
566 if (size == NGX_ERROR) { |
260d591cb6a3
Limit zone: added the "limit_conn_zone" directive.
Valentin Bartenev <vbart@nginx.com>
parents:
4271
diff
changeset
|
567 ngx_conf_log_error(NGX_LOG_EMERG, cf, 0, |
260d591cb6a3
Limit zone: added the "limit_conn_zone" directive.
Valentin Bartenev <vbart@nginx.com>
parents:
4271
diff
changeset
|
568 "invalid zone size \"%V\"", &value[i]); |
260d591cb6a3
Limit zone: added the "limit_conn_zone" directive.
Valentin Bartenev <vbart@nginx.com>
parents:
4271
diff
changeset
|
569 return NGX_CONF_ERROR; |
260d591cb6a3
Limit zone: added the "limit_conn_zone" directive.
Valentin Bartenev <vbart@nginx.com>
parents:
4271
diff
changeset
|
570 } |
260d591cb6a3
Limit zone: added the "limit_conn_zone" directive.
Valentin Bartenev <vbart@nginx.com>
parents:
4271
diff
changeset
|
571 |
260d591cb6a3
Limit zone: added the "limit_conn_zone" directive.
Valentin Bartenev <vbart@nginx.com>
parents:
4271
diff
changeset
|
572 if (size < (ssize_t) (8 * ngx_pagesize)) { |
260d591cb6a3
Limit zone: added the "limit_conn_zone" directive.
Valentin Bartenev <vbart@nginx.com>
parents:
4271
diff
changeset
|
573 ngx_conf_log_error(NGX_LOG_EMERG, cf, 0, |
260d591cb6a3
Limit zone: added the "limit_conn_zone" directive.
Valentin Bartenev <vbart@nginx.com>
parents:
4271
diff
changeset
|
574 "zone \"%V\" is too small", &value[i]); |
260d591cb6a3
Limit zone: added the "limit_conn_zone" directive.
Valentin Bartenev <vbart@nginx.com>
parents:
4271
diff
changeset
|
575 return NGX_CONF_ERROR; |
260d591cb6a3
Limit zone: added the "limit_conn_zone" directive.
Valentin Bartenev <vbart@nginx.com>
parents:
4271
diff
changeset
|
576 } |
260d591cb6a3
Limit zone: added the "limit_conn_zone" directive.
Valentin Bartenev <vbart@nginx.com>
parents:
4271
diff
changeset
|
577 |
260d591cb6a3
Limit zone: added the "limit_conn_zone" directive.
Valentin Bartenev <vbart@nginx.com>
parents:
4271
diff
changeset
|
578 continue; |
260d591cb6a3
Limit zone: added the "limit_conn_zone" directive.
Valentin Bartenev <vbart@nginx.com>
parents:
4271
diff
changeset
|
579 } |
260d591cb6a3
Limit zone: added the "limit_conn_zone" directive.
Valentin Bartenev <vbart@nginx.com>
parents:
4271
diff
changeset
|
580 |
260d591cb6a3
Limit zone: added the "limit_conn_zone" directive.
Valentin Bartenev <vbart@nginx.com>
parents:
4271
diff
changeset
|
581 ngx_conf_log_error(NGX_LOG_EMERG, cf, 0, |
260d591cb6a3
Limit zone: added the "limit_conn_zone" directive.
Valentin Bartenev <vbart@nginx.com>
parents:
4271
diff
changeset
|
582 "invalid parameter \"%V\"", &value[i]); |
260d591cb6a3
Limit zone: added the "limit_conn_zone" directive.
Valentin Bartenev <vbart@nginx.com>
parents:
4271
diff
changeset
|
583 return NGX_CONF_ERROR; |
260d591cb6a3
Limit zone: added the "limit_conn_zone" directive.
Valentin Bartenev <vbart@nginx.com>
parents:
4271
diff
changeset
|
584 } |
260d591cb6a3
Limit zone: added the "limit_conn_zone" directive.
Valentin Bartenev <vbart@nginx.com>
parents:
4271
diff
changeset
|
585 |
260d591cb6a3
Limit zone: added the "limit_conn_zone" directive.
Valentin Bartenev <vbart@nginx.com>
parents:
4271
diff
changeset
|
586 if (name.len == 0) { |
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587 ngx_conf_log_error(NGX_LOG_EMERG, cf, 0, |
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588 "\"%V\" must have \"zone\" parameter", |
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589 &cmd->name); |
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590 return NGX_CONF_ERROR; |
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591 } |
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592 |
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593 shm_zone = ngx_shared_memory_add(cf, &name, size, |
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594 &ngx_http_limit_conn_module); |
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595 if (shm_zone == NULL) { |
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596 return NGX_CONF_ERROR; |
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597 } |
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598 |
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599 if (shm_zone->data) { |
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600 ctx = shm_zone->data; |
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601 |
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602 ngx_conf_log_error(NGX_LOG_EMERG, cf, 0, |
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603 "%V \"%V\" is already bound to key \"%V\"", |
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604 &cmd->name, &name, &ctx->key.value); |
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605 return NGX_CONF_ERROR; |
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606 } |
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607 |
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608 shm_zone->init = ngx_http_limit_conn_init_zone; |
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609 shm_zone->data = ctx; |
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610 |
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611 return NGX_CONF_OK; |
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612 } |
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613 |
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614 |
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615 static char * |
980 | 616 ngx_http_limit_conn(ngx_conf_t *cf, ngx_command_t *cmd, void *conf) |
617 { | |
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618 ngx_shm_zone_t *shm_zone; |
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619 ngx_http_limit_conn_conf_t *lccf = conf; |
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620 ngx_http_limit_conn_limit_t *limit, *limits; |
980 | 621 |
622 ngx_str_t *value; | |
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623 ngx_int_t n; |
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624 ngx_uint_t i; |
2372 | 625 |
980 | 626 value = cf->args->elts; |
627 | |
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628 shm_zone = ngx_shared_memory_add(cf, &value[1], 0, |
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629 &ngx_http_limit_conn_module); |
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630 if (shm_zone == NULL) { |
980 | 631 return NGX_CONF_ERROR; |
632 } | |
633 | |
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634 limits = lccf->limits.elts; |
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635 |
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636 if (limits == NULL) { |
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637 if (ngx_array_init(&lccf->limits, cf->pool, 1, |
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638 sizeof(ngx_http_limit_conn_limit_t)) |
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639 != NGX_OK) |
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640 { |
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641 return NGX_CONF_ERROR; |
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642 } |
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643 } |
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644 |
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645 for (i = 0; i < lccf->limits.nelts; i++) { |
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646 if (shm_zone == limits[i].shm_zone) { |
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647 return "is duplicate"; |
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648 } |
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649 } |
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650 |
987 | 651 n = ngx_atoi(value[2].data, value[2].len); |
652 if (n <= 0) { | |
980 | 653 ngx_conf_log_error(NGX_LOG_EMERG, cf, 0, |
987 | 654 "invalid number of connections \"%V\"", &value[2]); |
980 | 655 return NGX_CONF_ERROR; |
656 } | |
657 | |
1011
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658 if (n > 65535) { |
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659 ngx_conf_log_error(NGX_LOG_EMERG, cf, 0, |
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660 "connection limit must be less 65536"); |
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661 return NGX_CONF_ERROR; |
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662 } |
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663 |
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664 limit = ngx_array_push(&lccf->limits); |
4811
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665 if (limit == NULL) { |
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666 return NGX_CONF_ERROR; |
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667 } |
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668 |
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669 limit->conn = n; |
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670 limit->shm_zone = shm_zone; |
980 | 671 |
672 return NGX_CONF_OK; | |
673 } | |
674 | |
675 | |
676 static ngx_int_t | |
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677 ngx_http_limit_conn_init(ngx_conf_t *cf) |
980 | 678 { |
679 ngx_http_handler_pt *h; | |
680 ngx_http_core_main_conf_t *cmcf; | |
681 | |
682 cmcf = ngx_http_conf_get_module_main_conf(cf, ngx_http_core_module); | |
683 | |
684 h = ngx_array_push(&cmcf->phases[NGX_HTTP_PREACCESS_PHASE].handlers); | |
685 if (h == NULL) { | |
686 return NGX_ERROR; | |
687 } | |
688 | |
4280
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Renamed ngx_http_limit_zone_module to ngx_http_limit_conn_module.
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689 *h = ngx_http_limit_conn_handler; |
980 | 690 |
691 return NGX_OK; | |
692 } |