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648
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1
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2 /*
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3 * Copyright (C) Igor Sysoev
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4 */
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5
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6
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7 #include <ngx_config.h>
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8 #include <ngx_core.h>
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9 #include <ngx_http.h>
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10
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11
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12 typedef struct {
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13 u_char color;
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14 u_char len;
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15 u_short conn;
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16 u_char data[1];
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17 } ngx_http_limit_conn_node_t;
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18
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19
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20 typedef struct {
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21 ngx_shm_zone_t *shm_zone;
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22 ngx_rbtree_node_t *node;
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23 } ngx_http_limit_conn_cleanup_t;
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24
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25
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26 typedef struct {
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27 ngx_rbtree_t *rbtree;
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28 ngx_int_t index;
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29 ngx_str_t var;
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30 } ngx_http_limit_conn_ctx_t;
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31
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32
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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_http_limit_conn_conf_t;
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43
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44
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45 static ngx_rbtree_node_t *ngx_http_limit_conn_lookup(ngx_rbtree_t *rbtree,
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46 ngx_http_variable_value_t *vv, uint32_t hash);
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47 static void ngx_http_limit_conn_cleanup(void *data);
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48 static ngx_inline void ngx_http_limit_conn_cleanup_all(ngx_pool_t *pool);
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49
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50 static void *ngx_http_limit_conn_create_conf(ngx_conf_t *cf);
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51 static char *ngx_http_limit_conn_merge_conf(ngx_conf_t *cf, void *parent,
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52 void *child);
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53 static char *ngx_http_limit_conn_zone(ngx_conf_t *cf, ngx_command_t *cmd,
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54 void *conf);
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55 static char *ngx_http_limit_zone(ngx_conf_t *cf, ngx_command_t *cmd,
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56 void *conf);
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57 static char *ngx_http_limit_conn(ngx_conf_t *cf, ngx_command_t *cmd,
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58 void *conf);
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59 static ngx_int_t ngx_http_limit_conn_init(ngx_conf_t *cf);
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60
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61
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62 static ngx_conf_deprecated_t ngx_conf_deprecated_limit_zone = {
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63 ngx_conf_deprecated, "limit_zone", "limit_conn_zone"
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64 };
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65
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66
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67 static ngx_conf_enum_t ngx_http_limit_conn_log_levels[] = {
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68 { ngx_string("info"), NGX_LOG_INFO },
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69 { ngx_string("notice"), NGX_LOG_NOTICE },
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70 { ngx_string("warn"), NGX_LOG_WARN },
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71 { ngx_string("error"), NGX_LOG_ERR },
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72 { ngx_null_string, 0 }
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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[] = {
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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
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85 { ngx_string("limit_zone"),
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86 NGX_HTTP_MAIN_CONF|NGX_CONF_TAKE3,
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87 ngx_http_limit_zone,
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88 0,
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89 0,
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90 NULL },
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91
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92 { ngx_string("limit_conn"),
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93 NGX_HTTP_MAIN_CONF|NGX_HTTP_SRV_CONF|NGX_HTTP_LOC_CONF|NGX_CONF_TAKE2,
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94 ngx_http_limit_conn,
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95 NGX_HTTP_LOC_CONF_OFFSET,
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96 0,
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97 NULL },
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98
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99 { ngx_string("limit_conn_log_level"),
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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_enum_slot,
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102 NGX_HTTP_LOC_CONF_OFFSET,
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103 offsetof(ngx_http_limit_conn_conf_t, log_level),
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104 &ngx_http_limit_conn_log_levels },
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105
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106 ngx_null_command
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107 };
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108
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109
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110 static ngx_http_module_t ngx_http_limit_conn_module_ctx = {
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111 NULL, /* preconfiguration */
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112 ngx_http_limit_conn_init, /* postconfiguration */
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113
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114 NULL, /* create main configuration */
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115 NULL, /* init main configuration */
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116
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117 NULL, /* create server configuration */
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118 NULL, /* merge server configuration */
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119
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120 ngx_http_limit_conn_create_conf, /* create location configration */
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121 ngx_http_limit_conn_merge_conf /* merge location configration */
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122 };
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123
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124
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125 ngx_module_t ngx_http_limit_conn_module = {
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126 NGX_MODULE_V1,
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127 &ngx_http_limit_conn_module_ctx, /* module context */
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128 ngx_http_limit_conn_commands, /* module directives */
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129 NGX_HTTP_MODULE, /* module type */
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130 NULL, /* init master */
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131 NULL, /* init module */
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132 NULL, /* init process */
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133 NULL, /* init thread */
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134 NULL, /* exit thread */
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135 NULL, /* exit process */
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136 NULL, /* exit master */
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137 NGX_MODULE_V1_PADDING
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138 };
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139
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140
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141 static ngx_int_t
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142 ngx_http_limit_conn_handler(ngx_http_request_t *r)
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143 {
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144 size_t len, n;
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145 uint32_t hash;
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146 ngx_uint_t i;
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147 ngx_slab_pool_t *shpool;
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148 ngx_rbtree_node_t *node;
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149 ngx_pool_cleanup_t *cln;
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150 ngx_http_variable_value_t *vv;
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151 ngx_http_limit_conn_ctx_t *ctx;
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152 ngx_http_limit_conn_node_t *lc;
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153 ngx_http_limit_conn_conf_t *lccf;
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154 ngx_http_limit_conn_limit_t *limits;
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155 ngx_http_limit_conn_cleanup_t *lccln;
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156
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157 if (r->main->limit_conn_set) {
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158 return NGX_DECLINED;
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159 }
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160
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161 r->main->limit_conn_set = 1;
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162
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163 lccf = ngx_http_get_module_loc_conf(r, ngx_http_limit_conn_module);
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164 limits = lccf->limits.elts;
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165
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166 for (i = 0; i < lccf->limits.nelts; i++) {
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167 ctx = limits[i].shm_zone->data;
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168
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169 vv = ngx_http_get_indexed_variable(r, ctx->index);
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170
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171 if (vv == NULL || vv->not_found) {
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172 continue;
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173 }
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174
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175 len = vv->len;
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176
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177 if (len == 0) {
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178 continue;
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179 }
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180
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181 if (len > 255) {
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182 ngx_log_error(NGX_LOG_ERR, r->connection->log, 0,
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183 "the value of the \"%V\" variable "
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184 "is more than 255 bytes: \"%v\"",
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185 &ctx->var, vv);
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186 continue;
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187 }
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188
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189 hash = ngx_crc32_short(vv->data, len);
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190
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191 shpool = (ngx_slab_pool_t *) limits[i].shm_zone->shm.addr;
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192
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193 ngx_shmtx_lock(&shpool->mutex);
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194
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195 node = ngx_http_limit_conn_lookup(ctx->rbtree, vv, hash);
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196
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197 if (node == NULL) {
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198
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199 n = offsetof(ngx_rbtree_node_t, color)
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200 + offsetof(ngx_http_limit_conn_node_t, data)
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201 + len;
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202
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203 node = ngx_slab_alloc_locked(shpool, n);
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204
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205 if (node == NULL) {
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206 ngx_shmtx_unlock(&shpool->mutex);
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207 ngx_http_limit_conn_cleanup_all(r->pool);
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208 return NGX_HTTP_SERVICE_UNAVAILABLE;
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209 }
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210
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211 lc = (ngx_http_limit_conn_node_t *) &node->color;
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212
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213 node->key = hash;
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214 lc->len = (u_char) len;
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215 lc->conn = 1;
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216 ngx_memcpy(lc->data, vv->data, len);
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217
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218 ngx_rbtree_insert(ctx->rbtree, node);
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219
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220 } else {
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221
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222 lc = (ngx_http_limit_conn_node_t *) &node->color;
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223
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224 if ((ngx_uint_t) lc->conn >= limits[i].conn) {
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225
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226 ngx_shmtx_unlock(&shpool->mutex);
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227
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228 ngx_log_error(lccf->log_level, r->connection->log, 0,
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229 "limiting connections by zone \"%V\"",
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230 &limits[i].shm_zone->shm.name);
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231
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232 ngx_http_limit_conn_cleanup_all(r->pool);
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233 return NGX_HTTP_SERVICE_UNAVAILABLE;
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234 }
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235
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236 lc->conn++;
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237 }
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238
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239 ngx_log_debug2(NGX_LOG_DEBUG_HTTP, r->connection->log, 0,
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240 "limit zone: %08XD %d", node->key, lc->conn);
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241
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242 ngx_shmtx_unlock(&shpool->mutex);
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243
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244 cln = ngx_pool_cleanup_add(r->pool,
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245 sizeof(ngx_http_limit_conn_cleanup_t));
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246 if (cln == NULL) {
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247 return NGX_HTTP_INTERNAL_SERVER_ERROR;
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248 }
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249
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250 cln->handler = ngx_http_limit_conn_cleanup;
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251 lccln = cln->data;
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252
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253 lccln->shm_zone = limits[i].shm_zone;
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254 lccln->node = node;
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255 }
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256
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257 return NGX_DECLINED;
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258 }
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259
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260
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261 static void
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262 ngx_http_limit_conn_rbtree_insert_value(ngx_rbtree_node_t *temp,
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263 ngx_rbtree_node_t *node, ngx_rbtree_node_t *sentinel)
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264 {
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265 ngx_rbtree_node_t **p;
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266 ngx_http_limit_conn_node_t *lcn, *lcnt;
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267
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268 for ( ;; ) {
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269
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270 if (node->key < temp->key) {
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271
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272 p = &temp->left;
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273
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274 } else if (node->key > temp->key) {
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275
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276 p = &temp->right;
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277
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278 } else { /* node->key == temp->key */
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279
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280 lcn = (ngx_http_limit_conn_node_t *) &node->color;
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281 lcnt = (ngx_http_limit_conn_node_t *) &temp->color;
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282
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283 p = (ngx_memn2cmp(lcn->data, lcnt->data, lcn->len, lcnt->len) < 0)
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284 ? &temp->left : &temp->right;
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285 }
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286
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287 if (*p == sentinel) {
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288 break;
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289 }
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290
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291 temp = *p;
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292 }
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293
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294 *p = node;
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295 node->parent = temp;
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296 node->left = sentinel;
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297 node->right = sentinel;
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298 ngx_rbt_red(node);
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299 }
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300
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301
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302 static ngx_rbtree_node_t *
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303 ngx_http_limit_conn_lookup(ngx_rbtree_t *rbtree, ngx_http_variable_value_t *vv,
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304 uint32_t hash)
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305 {
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306 ngx_int_t rc;
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307 ngx_rbtree_node_t *node, *sentinel;
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308 ngx_http_limit_conn_node_t *lcn;
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309
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310 node = rbtree->root;
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311 sentinel = rbtree->sentinel;
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312
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313 while (node != sentinel) {
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314
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315 if (hash < node->key) {
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316 node = node->left;
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317 continue;
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318 }
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319
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320 if (hash > node->key) {
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321 node = node->right;
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322 continue;
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323 }
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324
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325 /* hash == node->key */
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326
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327 do {
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328 lcn = (ngx_http_limit_conn_node_t *) &node->color;
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329
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330 rc = ngx_memn2cmp(vv->data, lcn->data,
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331 (size_t) vv->len, (size_t) lcn->len);
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332 if (rc == 0) {
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333 return node;
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334 }
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335
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336 node = (rc < 0) ? node->left : node->right;
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337
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338 } while (node != sentinel && hash == node->key);
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339
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340 break;
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341 }
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342
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343 return NULL;
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344 }
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345
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346
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347 static void
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348 ngx_http_limit_conn_cleanup(void *data)
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349 {
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350 ngx_http_limit_conn_cleanup_t *lccln = data;
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351
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352 ngx_slab_pool_t *shpool;
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353 ngx_rbtree_node_t *node;
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354 ngx_http_limit_conn_ctx_t *ctx;
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355 ngx_http_limit_conn_node_t *lc;
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356
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357 ctx = lccln->shm_zone->data;
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358 shpool = (ngx_slab_pool_t *) lccln->shm_zone->shm.addr;
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359 node = lccln->node;
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360 lc = (ngx_http_limit_conn_node_t *) &node->color;
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361
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362 ngx_shmtx_lock(&shpool->mutex);
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363
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364 ngx_log_debug2(NGX_LOG_DEBUG_HTTP, lccln->shm_zone->shm.log, 0,
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365 "limit zone cleanup: %08XD %d", node->key, lc->conn);
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366
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367 lc->conn--;
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368
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369 if (lc->conn == 0) {
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370 ngx_rbtree_delete(ctx->rbtree, node);
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371 ngx_slab_free_locked(shpool, node);
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372 }
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373
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374 ngx_shmtx_unlock(&shpool->mutex);
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375 }
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376
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377
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378 static ngx_inline void
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379 ngx_http_limit_conn_cleanup_all(ngx_pool_t *pool)
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380 {
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381 ngx_pool_cleanup_t *cln;
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382
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383 cln = pool->cleanup;
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384
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385 while (cln && cln->handler == ngx_http_limit_conn_cleanup) {
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386 ngx_http_limit_conn_cleanup(cln->data);
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387 cln = cln->next;
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388 }
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389
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390 pool->cleanup = cln;
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391 }
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392
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393
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394 static ngx_int_t
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395 ngx_http_limit_conn_init_zone(ngx_shm_zone_t *shm_zone, void *data)
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396 {
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397 ngx_http_limit_conn_ctx_t *octx = data;
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398
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399 size_t len;
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400 ngx_slab_pool_t *shpool;
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401 ngx_rbtree_node_t *sentinel;
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402 ngx_http_limit_conn_ctx_t *ctx;
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403
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404 ctx = shm_zone->data;
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405
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406 if (octx) {
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407 if (ngx_strcmp(ctx->var.data, octx->var.data) != 0) {
|
|
|
408 ngx_log_error(NGX_LOG_EMERG, shm_zone->shm.log, 0,
|
|
|
409 "limit_conn_zone \"%V\" uses the \"%V\" variable "
|
|
|
410 "while previously it used the \"%V\" variable",
|
|
|
411 &shm_zone->shm.name, &ctx->var, &octx->var);
|
|
|
412 return NGX_ERROR;
|
|
|
413 }
|
|
|
414
|
|
|
415 ctx->rbtree = octx->rbtree;
|
|
|
416
|
|
|
417 return NGX_OK;
|
|
|
418 }
|
|
|
419
|
|
|
420 shpool = (ngx_slab_pool_t *) shm_zone->shm.addr;
|
|
|
421
|
|
|
422 if (shm_zone->shm.exists) {
|
|
|
423 ctx->rbtree = shpool->data;
|
|
|
424
|
|
|
425 return NGX_OK;
|
|
|
426 }
|
|
|
427
|
|
|
428 ctx->rbtree = ngx_slab_alloc(shpool, sizeof(ngx_rbtree_t));
|
|
|
429 if (ctx->rbtree == NULL) {
|
|
|
430 return NGX_ERROR;
|
|
|
431 }
|
|
|
432
|
|
|
433 shpool->data = ctx->rbtree;
|
|
|
434
|
|
|
435 sentinel = ngx_slab_alloc(shpool, sizeof(ngx_rbtree_node_t));
|
|
|
436 if (sentinel == NULL) {
|
|
|
437 return NGX_ERROR;
|
|
|
438 }
|
|
|
439
|
|
|
440 ngx_rbtree_init(ctx->rbtree, sentinel,
|
|
|
441 ngx_http_limit_conn_rbtree_insert_value);
|
|
|
442
|
|
|
443 len = sizeof(" in limit_conn_zone \"\"") + shm_zone->shm.name.len;
|
|
|
444
|
|
|
445 shpool->log_ctx = ngx_slab_alloc(shpool, len);
|
|
|
446 if (shpool->log_ctx == NULL) {
|
|
|
447 return NGX_ERROR;
|
|
|
448 }
|
|
|
449
|
|
|
450 ngx_sprintf(shpool->log_ctx, " in limit_conn_zone \"%V\"%Z",
|
|
|
451 &shm_zone->shm.name);
|
|
|
452
|
|
|
453 return NGX_OK;
|
|
|
454 }
|
|
|
455
|
|
|
456
|
|
|
457 static void *
|
|
|
458 ngx_http_limit_conn_create_conf(ngx_conf_t *cf)
|
|
|
459 {
|
|
|
460 ngx_http_limit_conn_conf_t *conf;
|
|
|
461
|
|
|
462 conf = ngx_pcalloc(cf->pool, sizeof(ngx_http_limit_conn_conf_t));
|
|
|
463 if (conf == NULL) {
|
|
|
464 return NULL;
|
|
|
465 }
|
|
|
466
|
|
|
467 /*
|
|
|
468 * set by ngx_pcalloc():
|
|
|
469 *
|
|
|
470 * conf->limits.elts = NULL;
|
|
|
471 */
|
|
|
472
|
|
|
473 conf->log_level = NGX_CONF_UNSET_UINT;
|
|
|
474
|
|
|
475 return conf;
|
|
|
476 }
|
|
|
477
|
|
|
478
|
|
|
479 static char *
|
|
|
480 ngx_http_limit_conn_merge_conf(ngx_conf_t *cf, void *parent, void *child)
|
|
|
481 {
|
|
|
482 ngx_http_limit_conn_conf_t *prev = parent;
|
|
|
483 ngx_http_limit_conn_conf_t *conf = child;
|
|
|
484
|
|
|
485 if (conf->limits.elts == NULL) {
|
|
|
486 *conf = *prev;
|
|
|
487 }
|
|
|
488
|
|
|
489 ngx_conf_merge_uint_value(conf->log_level, prev->log_level, NGX_LOG_ERR);
|
|
|
490
|
|
|
491 return NGX_CONF_OK;
|
|
|
492 }
|
|
|
493
|
|
|
494
|
|
|
495 static char *
|
|
|
496 ngx_http_limit_conn_zone(ngx_conf_t *cf, ngx_command_t *cmd, void *conf)
|
|
|
497 {
|
|
|
498 u_char *p;
|
|
|
499 ssize_t size;
|
|
|
500 ngx_str_t *value, name, s;
|
|
|
501 ngx_uint_t i;
|
|
|
502 ngx_shm_zone_t *shm_zone;
|
|
|
503 ngx_http_limit_conn_ctx_t *ctx;
|
|
|
504
|
|
|
505 value = cf->args->elts;
|
|
|
506
|
|
|
507 ctx = NULL;
|
|
|
508 size = 0;
|
|
|
509 name.len = 0;
|
|
|
510
|
|
|
511 for (i = 1; i < cf->args->nelts; i++) {
|
|
|
512
|
|
|
513 if (ngx_strncmp(value[i].data, "zone=", 5) == 0) {
|
|
|
514
|
|
|
515 name.data = value[i].data + 5;
|
|
|
516
|
|
|
517 p = (u_char *) ngx_strchr(name.data, ':');
|
|
|
518
|
|
|
519 if (p == NULL) {
|
|
|
520 ngx_conf_log_error(NGX_LOG_EMERG, cf, 0,
|
|
|
521 "invalid zone size \"%V\"", &value[i]);
|
|
|
522 return NGX_CONF_ERROR;
|
|
|
523 }
|
|
|
524
|
|
|
525 name.len = p - name.data;
|
|
|
526
|
|
|
527 s.data = p + 1;
|
|
|
528 s.len = value[i].data + value[i].len - s.data;
|
|
|
529
|
|
|
530 size = ngx_parse_size(&s);
|
|
|
531
|
|
|
532 if (size == NGX_ERROR) {
|
|
|
533 ngx_conf_log_error(NGX_LOG_EMERG, cf, 0,
|
|
|
534 "invalid zone size \"%V\"", &value[i]);
|
|
|
535 return NGX_CONF_ERROR;
|
|
|
536 }
|
|
|
537
|
|
|
538 if (size < (ssize_t) (8 * ngx_pagesize)) {
|
|
|
539 ngx_conf_log_error(NGX_LOG_EMERG, cf, 0,
|
|
|
540 "zone \"%V\" is too small", &value[i]);
|
|
|
541 return NGX_CONF_ERROR;
|
|
|
542 }
|
|
|
543
|
|
|
544 continue;
|
|
|
545 }
|
|
|
546
|
|
|
547 if (value[i].data[0] == '$') {
|
|
|
548
|
|
|
549 value[i].len--;
|
|
|
550 value[i].data++;
|
|
|
551
|
|
|
552 ctx = ngx_pcalloc(cf->pool, sizeof(ngx_http_limit_conn_ctx_t));
|
|
|
553 if (ctx == NULL) {
|
|
|
554 return NGX_CONF_ERROR;
|
|
|
555 }
|
|
|
556
|
|
|
557 ctx->index = ngx_http_get_variable_index(cf, &value[i]);
|
|
|
558 if (ctx->index == NGX_ERROR) {
|
|
|
559 return NGX_CONF_ERROR;
|
|
|
560 }
|
|
|
561
|
|
|
562 ctx->var = value[i];
|
|
|
563
|
|
|
564 continue;
|
|
|
565 }
|
|
|
566
|
|
|
567 ngx_conf_log_error(NGX_LOG_EMERG, cf, 0,
|
|
|
568 "invalid parameter \"%V\"", &value[i]);
|
|
|
569 return NGX_CONF_ERROR;
|
|
|
570 }
|
|
|
571
|
|
|
572 if (name.len == 0) {
|
|
|
573 ngx_conf_log_error(NGX_LOG_EMERG, cf, 0,
|
|
|
574 "\"%V\" must have \"zone\" parameter",
|
|
|
575 &cmd->name);
|
|
|
576 return NGX_CONF_ERROR;
|
|
|
577 }
|
|
|
578
|
|
|
579 if (ctx == NULL) {
|
|
|
580 ngx_conf_log_error(NGX_LOG_EMERG, cf, 0,
|
|
|
581 "no variable is defined for %V \"%V\"",
|
|
|
582 &cmd->name, &name);
|
|
|
583 return NGX_CONF_ERROR;
|
|
|
584 }
|
|
|
585
|
|
|
586 shm_zone = ngx_shared_memory_add(cf, &name, size,
|
|
|
587 &ngx_http_limit_conn_module);
|
|
|
588 if (shm_zone == NULL) {
|
|
|
589 return NGX_CONF_ERROR;
|
|
|
590 }
|
|
|
591
|
|
|
592 if (shm_zone->data) {
|
|
|
593 ctx = shm_zone->data;
|
|
|
594
|
|
|
595 ngx_conf_log_error(NGX_LOG_EMERG, cf, 0,
|
|
|
596 "%V \"%V\" is already bound to variable \"%V\"",
|
|
|
597 &cmd->name, &name, &ctx->var);
|
|
|
598 return NGX_CONF_ERROR;
|
|
|
599 }
|
|
|
600
|
|
|
601 shm_zone->init = ngx_http_limit_conn_init_zone;
|
|
|
602 shm_zone->data = ctx;
|
|
|
603
|
|
|
604 return NGX_CONF_OK;
|
|
|
605 }
|
|
|
606
|
|
|
607
|
|
|
608 static char *
|
|
|
609 ngx_http_limit_zone(ngx_conf_t *cf, ngx_command_t *cmd, void *conf)
|
|
|
610 {
|
|
|
611 ssize_t n;
|
|
|
612 ngx_str_t *value;
|
|
|
613 ngx_shm_zone_t *shm_zone;
|
|
|
614 ngx_http_limit_conn_ctx_t *ctx;
|
|
|
615
|
|
|
616 ngx_conf_deprecated(cf, &ngx_conf_deprecated_limit_zone, NULL);
|
|
|
617
|
|
|
618 value = cf->args->elts;
|
|
|
619
|
|
|
620 if (value[2].data[0] != '$') {
|
|
|
621 ngx_conf_log_error(NGX_LOG_EMERG, cf, 0,
|
|
|
622 "invalid variable name \"%V\"", &value[2]);
|
|
|
623 return NGX_CONF_ERROR;
|
|
|
624 }
|
|
|
625
|
|
|
626 value[2].len--;
|
|
|
627 value[2].data++;
|
|
|
628
|
|
|
629 ctx = ngx_pcalloc(cf->pool, sizeof(ngx_http_limit_conn_ctx_t));
|
|
|
630 if (ctx == NULL) {
|
|
|
631 return NGX_CONF_ERROR;
|
|
|
632 }
|
|
|
633
|
|
|
634 ctx->index = ngx_http_get_variable_index(cf, &value[2]);
|
|
|
635 if (ctx->index == NGX_ERROR) {
|
|
|
636 return NGX_CONF_ERROR;
|
|
|
637 }
|
|
|
638
|
|
|
639 ctx->var = value[2];
|
|
|
640
|
|
|
641 n = ngx_parse_size(&value[3]);
|
|
|
642
|
|
|
643 if (n == NGX_ERROR) {
|
|
|
644 ngx_conf_log_error(NGX_LOG_EMERG, cf, 0,
|
|
|
645 "invalid size of limit_zone \"%V\"", &value[3]);
|
|
|
646 return NGX_CONF_ERROR;
|
|
|
647 }
|
|
|
648
|
|
|
649 if (n < (ngx_int_t) (8 * ngx_pagesize)) {
|
|
|
650 ngx_conf_log_error(NGX_LOG_EMERG, cf, 0,
|
|
|
651 "limit_zone \"%V\" is too small", &value[1]);
|
|
|
652 return NGX_CONF_ERROR;
|
|
|
653 }
|
|
|
654
|
|
|
655
|
|
|
656 shm_zone = ngx_shared_memory_add(cf, &value[1], n,
|
|
|
657 &ngx_http_limit_conn_module);
|
|
|
658 if (shm_zone == NULL) {
|
|
|
659 return NGX_CONF_ERROR;
|
|
|
660 }
|
|
|
661
|
|
|
662 if (shm_zone->data) {
|
|
|
663 ctx = shm_zone->data;
|
|
|
664
|
|
|
665 ngx_conf_log_error(NGX_LOG_EMERG, cf, 0,
|
|
|
666 "limit_zone \"%V\" is already bound to variable \"%V\"",
|
|
|
667 &value[1], &ctx->var);
|
|
|
668 return NGX_CONF_ERROR;
|
|
|
669 }
|
|
|
670
|
|
|
671 shm_zone->init = ngx_http_limit_conn_init_zone;
|
|
|
672 shm_zone->data = ctx;
|
|
|
673
|
|
|
674 return NGX_CONF_OK;
|
|
|
675 }
|
|
|
676
|
|
|
677
|
|
|
678 static char *
|
|
|
679 ngx_http_limit_conn(ngx_conf_t *cf, ngx_command_t *cmd, void *conf)
|
|
|
680 {
|
|
|
681 ngx_shm_zone_t *shm_zone;
|
|
|
682 ngx_http_limit_conn_conf_t *lccf = conf;
|
|
|
683 ngx_http_limit_conn_limit_t *limit, *limits;
|
|
|
684
|
|
|
685 ngx_str_t *value;
|
|
|
686 ngx_int_t n;
|
|
|
687 ngx_uint_t i;
|
|
|
688
|
|
|
689 value = cf->args->elts;
|
|
|
690
|
|
|
691 shm_zone = ngx_shared_memory_add(cf, &value[1], 0,
|
|
|
692 &ngx_http_limit_conn_module);
|
|
|
693 if (shm_zone == NULL) {
|
|
|
694 return NGX_CONF_ERROR;
|
|
|
695 }
|
|
|
696
|
|
|
697 limits = lccf->limits.elts;
|
|
|
698
|
|
|
699 if (limits == NULL) {
|
|
|
700 if (ngx_array_init(&lccf->limits, cf->pool, 1,
|
|
|
701 sizeof(ngx_http_limit_conn_limit_t))
|
|
|
702 != NGX_OK)
|
|
|
703 {
|
|
|
704 return NGX_CONF_ERROR;
|
|
|
705 }
|
|
|
706 }
|
|
|
707
|
|
|
708 for (i = 0; i < lccf->limits.nelts; i++) {
|
|
|
709 if (shm_zone == limits[i].shm_zone) {
|
|
|
710 return "is duplicate";
|
|
|
711 }
|
|
|
712 }
|
|
|
713
|
|
|
714 n = ngx_atoi(value[2].data, value[2].len);
|
|
|
715 if (n <= 0) {
|
|
|
716 ngx_conf_log_error(NGX_LOG_EMERG, cf, 0,
|
|
|
717 "invalid number of connections \"%V\"", &value[2]);
|
|
|
718 return NGX_CONF_ERROR;
|
|
|
719 }
|
|
|
720
|
|
|
721 if (n > 65535) {
|
|
|
722 ngx_conf_log_error(NGX_LOG_EMERG, cf, 0,
|
|
|
723 "connection limit must be less 65536");
|
|
|
724 return NGX_CONF_ERROR;
|
|
|
725 }
|
|
|
726
|
|
|
727 limit = ngx_array_push(&lccf->limits);
|
|
|
728 limit->conn = n;
|
|
|
729 limit->shm_zone = shm_zone;
|
|
|
730
|
|
|
731 return NGX_CONF_OK;
|
|
|
732 }
|
|
|
733
|
|
|
734
|
|
|
735 static ngx_int_t
|
|
|
736 ngx_http_limit_conn_init(ngx_conf_t *cf)
|
|
|
737 {
|
|
|
738 ngx_http_handler_pt *h;
|
|
|
739 ngx_http_core_main_conf_t *cmcf;
|
|
|
740
|
|
|
741 cmcf = ngx_http_conf_get_module_main_conf(cf, ngx_http_core_module);
|
|
|
742
|
|
|
743 h = ngx_array_push(&cmcf->phases[NGX_HTTP_PREACCESS_PHASE].handlers);
|
|
|
744 if (h == NULL) {
|
|
|
745 return NGX_ERROR;
|
|
|
746 }
|
|
|
747
|
|
|
748 *h = ngx_http_limit_conn_handler;
|
|
|
749
|
|
|
750 return NGX_OK;
|
|
|
751 }
|
