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416
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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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480
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13 u_char color;
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14 u_char dummy;
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15 u_short len;
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16 ngx_queue_t queue;
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17 ngx_msec_t last;
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18 /* integer value, 1 corresponds to 0.001 r/s */
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19 ngx_uint_t excess;
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20 u_char data[1];
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416
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21 } ngx_http_limit_req_node_t;
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22
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23
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24 typedef struct {
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480
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25 ngx_rbtree_t rbtree;
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26 ngx_rbtree_node_t sentinel;
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27 ngx_queue_t queue;
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28 } ngx_http_limit_req_shctx_t;
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29
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30
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31 typedef struct {
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32 ngx_http_limit_req_shctx_t *sh;
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33 ngx_slab_pool_t *shpool;
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34 /* integer value, 1 corresponds to 0.001 r/s */
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35 ngx_uint_t rate;
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36 ngx_int_t index;
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37 ngx_str_t var;
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416
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38 } ngx_http_limit_req_ctx_t;
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39
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40
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41 typedef struct {
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480
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42 ngx_shm_zone_t *shm_zone;
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43 /* integer value, 1 corresponds to 0.001 r/s */
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44 ngx_uint_t burst;
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532
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45 ngx_uint_t limit_log_level;
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46 ngx_uint_t delay_log_level;
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47
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48 ngx_uint_t nodelay; /* unsigned nodelay:1 */
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416
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49 } ngx_http_limit_req_conf_t;
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50
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51
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52 static void ngx_http_limit_req_delay(ngx_http_request_t *r);
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426
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53 static ngx_int_t ngx_http_limit_req_lookup(ngx_http_limit_req_conf_t *lrcf,
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602
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54 ngx_uint_t hash, u_char *data, size_t len, ngx_uint_t *ep);
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416
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55 static void ngx_http_limit_req_expire(ngx_http_limit_req_ctx_t *ctx,
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56 ngx_uint_t n);
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57
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58 static void *ngx_http_limit_req_create_conf(ngx_conf_t *cf);
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59 static char *ngx_http_limit_req_merge_conf(ngx_conf_t *cf, void *parent,
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60 void *child);
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61 static char *ngx_http_limit_req_zone(ngx_conf_t *cf, ngx_command_t *cmd,
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62 void *conf);
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63 static char *ngx_http_limit_req(ngx_conf_t *cf, ngx_command_t *cmd,
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64 void *conf);
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65 static ngx_int_t ngx_http_limit_req_init(ngx_conf_t *cf);
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66
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67
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532
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68 static ngx_conf_enum_t ngx_http_limit_req_log_levels[] = {
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69 { ngx_string("info"), NGX_LOG_INFO },
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70 { ngx_string("notice"), NGX_LOG_NOTICE },
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71 { ngx_string("warn"), NGX_LOG_WARN },
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72 { ngx_string("error"), NGX_LOG_ERR },
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73 { ngx_null_string, 0 }
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74 };
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75
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76
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416
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77 static ngx_command_t ngx_http_limit_req_commands[] = {
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78
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79 { ngx_string("limit_req_zone"),
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80 NGX_HTTP_MAIN_CONF|NGX_CONF_TAKE3,
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81 ngx_http_limit_req_zone,
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82 0,
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83 0,
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84 NULL },
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85
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86 { ngx_string("limit_req"),
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87 NGX_HTTP_MAIN_CONF|NGX_HTTP_SRV_CONF|NGX_HTTP_LOC_CONF|NGX_CONF_TAKE123,
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88 ngx_http_limit_req,
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89 NGX_HTTP_LOC_CONF_OFFSET,
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90 0,
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91 NULL },
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92
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532
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93 { ngx_string("limit_req_log_level"),
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94 NGX_HTTP_MAIN_CONF|NGX_HTTP_SRV_CONF|NGX_HTTP_LOC_CONF|NGX_CONF_TAKE1,
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95 ngx_conf_set_enum_slot,
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96 NGX_HTTP_LOC_CONF_OFFSET,
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97 offsetof(ngx_http_limit_req_conf_t, limit_log_level),
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98 &ngx_http_limit_req_log_levels },
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99
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416
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100 ngx_null_command
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101 };
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102
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103
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104 static ngx_http_module_t ngx_http_limit_req_module_ctx = {
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105 NULL, /* preconfiguration */
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106 ngx_http_limit_req_init, /* postconfiguration */
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107
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108 NULL, /* create main configuration */
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109 NULL, /* init main configuration */
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110
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111 NULL, /* create server configuration */
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112 NULL, /* merge server configuration */
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113
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114 ngx_http_limit_req_create_conf, /* create location configration */
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115 ngx_http_limit_req_merge_conf /* merge location configration */
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116 };
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117
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118
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119 ngx_module_t ngx_http_limit_req_module = {
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120 NGX_MODULE_V1,
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121 &ngx_http_limit_req_module_ctx, /* module context */
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122 ngx_http_limit_req_commands, /* module directives */
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123 NGX_HTTP_MODULE, /* module type */
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124 NULL, /* init master */
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125 NULL, /* init module */
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126 NULL, /* init process */
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127 NULL, /* init thread */
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128 NULL, /* exit thread */
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129 NULL, /* exit process */
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130 NULL, /* exit master */
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131 NGX_MODULE_V1_PADDING
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132 };
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133
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134
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135 static ngx_int_t
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136 ngx_http_limit_req_handler(ngx_http_request_t *r)
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137 {
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138 size_t len, n;
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139 uint32_t hash;
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140 ngx_int_t rc;
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420
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141 ngx_uint_t excess;
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416
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142 ngx_time_t *tp;
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143 ngx_rbtree_node_t *node;
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144 ngx_http_variable_value_t *vv;
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145 ngx_http_limit_req_ctx_t *ctx;
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426
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146 ngx_http_limit_req_node_t *lr;
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147 ngx_http_limit_req_conf_t *lrcf;
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416
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148
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149 if (r->main->limit_req_set) {
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150 return NGX_DECLINED;
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151 }
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152
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426
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153 lrcf = ngx_http_get_module_loc_conf(r, ngx_http_limit_req_module);
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416
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154
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426
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155 if (lrcf->shm_zone == NULL) {
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416
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156 return NGX_DECLINED;
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157 }
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158
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426
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159 ctx = lrcf->shm_zone->data;
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416
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160
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161 vv = ngx_http_get_indexed_variable(r, ctx->index);
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162
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163 if (vv == NULL || vv->not_found) {
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164 return NGX_DECLINED;
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165 }
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166
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167 len = vv->len;
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168
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169 if (len == 0) {
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170 return NGX_DECLINED;
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171 }
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172
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173 if (len > 65535) {
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174 ngx_log_error(NGX_LOG_ERR, r->connection->log, 0,
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175 "the value of the \"%V\" variable "
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176 "is more than 65535 bytes: \"%v\"",
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177 &ctx->var, vv);
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178 return NGX_DECLINED;
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179 }
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180
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181 r->main->limit_req_set = 1;
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182
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183 hash = ngx_crc32_short(vv->data, len);
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184
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185 ngx_shmtx_lock(&ctx->shpool->mutex);
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186
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187 ngx_http_limit_req_expire(ctx, 1);
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188
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602
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189 rc = ngx_http_limit_req_lookup(lrcf, hash, vv->data, len, &excess);
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416
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190
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420
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191 ngx_log_debug3(NGX_LOG_DEBUG_HTTP, r->connection->log, 0,
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506
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192 "limit_req: %i %ui.%03ui", rc, excess / 1000, excess % 1000);
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416
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193
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602
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194 if (rc == NGX_DECLINED) {
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195
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196 n = offsetof(ngx_rbtree_node_t, color)
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197 + offsetof(ngx_http_limit_req_node_t, data)
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198 + len;
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199
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200 node = ngx_slab_alloc_locked(ctx->shpool, n);
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201 if (node == NULL) {
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202
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203 ngx_http_limit_req_expire(ctx, 0);
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204
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205 node = ngx_slab_alloc_locked(ctx->shpool, n);
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206 if (node == NULL) {
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207 ngx_shmtx_unlock(&ctx->shpool->mutex);
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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
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212 lr = (ngx_http_limit_req_node_t *) &node->color;
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213
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214 node->key = hash;
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215 lr->len = (u_char) len;
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216
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217 tp = ngx_timeofday();
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218 lr->last = (ngx_msec_t) (tp->sec * 1000 + tp->msec);
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219
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220 lr->excess = 0;
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221 ngx_memcpy(lr->data, vv->data, len);
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222
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223 ngx_rbtree_insert(&ctx->sh->rbtree, node);
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224
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225 ngx_queue_insert_head(&ctx->sh->queue, &lr->queue);
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226
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416
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227 ngx_shmtx_unlock(&ctx->shpool->mutex);
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228
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602
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229 return NGX_DECLINED;
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230 }
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231
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232 ngx_shmtx_unlock(&ctx->shpool->mutex);
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233
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234 if (rc == NGX_OK) {
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235 return NGX_DECLINED;
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236 }
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237
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238 if (rc == NGX_BUSY) {
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532
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239 ngx_log_error(lrcf->limit_log_level, r->connection->log, 0,
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426
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240 "limiting requests, excess: %ui.%03ui by zone \"%V\"",
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480
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241 excess / 1000, excess % 1000, &lrcf->shm_zone->shm.name);
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416
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242
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243 return NGX_HTTP_SERVICE_UNAVAILABLE;
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244 }
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245
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602
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246 /* rc == NGX_AGAIN */
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418
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247
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602
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248 if (lrcf->nodelay) {
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249 return NGX_DECLINED;
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416
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250 }
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251
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602
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252 ngx_log_error(lrcf->delay_log_level, r->connection->log, 0,
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253 "delaying request, excess: %ui.%03ui, by zone \"%V\"",
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254 excess / 1000, excess % 1000, &lrcf->shm_zone->shm.name);
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416
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255
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602
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256 if (ngx_handle_read_event(r->connection->read, 0) != NGX_OK) {
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257 return NGX_HTTP_INTERNAL_SERVER_ERROR;
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416
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258 }
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259
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602
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260 r->read_event_handler = ngx_http_test_reading;
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261 r->write_event_handler = ngx_http_limit_req_delay;
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262 ngx_add_timer(r->connection->write,
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263 (ngx_msec_t) excess * 1000 / ctx->rate);
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416
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264
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602
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265 return NGX_AGAIN;
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416
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266 }
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267
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268
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269 static void
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270 ngx_http_limit_req_delay(ngx_http_request_t *r)
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271 {
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506
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272 ngx_event_t *wev;
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273
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416
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274 ngx_log_debug0(NGX_LOG_DEBUG_HTTP, r->connection->log, 0,
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506
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275 "limit_req delay");
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276
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277 wev = r->connection->write;
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278
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279 if (!wev->timedout) {
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280
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281 if (ngx_handle_write_event(wev, 0) != NGX_OK) {
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282 ngx_http_finalize_request(r, NGX_HTTP_INTERNAL_SERVER_ERROR);
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283 }
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284
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285 return;
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286 }
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287
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288 wev->timedout = 0;
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416
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289
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290 if (ngx_handle_read_event(r->connection->read, 0) != NGX_OK) {
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291 ngx_http_finalize_request(r, NGX_HTTP_INTERNAL_SERVER_ERROR);
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292 return;
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293 }
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294
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295 r->read_event_handler = ngx_http_block_reading;
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296 r->write_event_handler = ngx_http_core_run_phases;
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297
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298 ngx_http_core_run_phases(r);
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299 }
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300
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301
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302 static void
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303 ngx_http_limit_req_rbtree_insert_value(ngx_rbtree_node_t *temp,
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304 ngx_rbtree_node_t *node, ngx_rbtree_node_t *sentinel)
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305 {
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306 ngx_rbtree_node_t **p;
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426
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307 ngx_http_limit_req_node_t *lrn, *lrnt;
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416
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308
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309 for ( ;; ) {
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310
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311 if (node->key < temp->key) {
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312
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313 p = &temp->left;
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314
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315 } else if (node->key > temp->key) {
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316
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317 p = &temp->right;
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318
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319 } else { /* node->key == temp->key */
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320
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426
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321 lrn = (ngx_http_limit_req_node_t *) &node->color;
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322 lrnt = (ngx_http_limit_req_node_t *) &temp->color;
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416
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323
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426
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324 p = (ngx_memn2cmp(lrn->data, lrnt->data, lrn->len, lrnt->len) < 0)
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416
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325 ? &temp->left : &temp->right;
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326 }
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327
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328 if (*p == sentinel) {
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329 break;
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330 }
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331
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332 temp = *p;
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333 }
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334
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335 *p = node;
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336 node->parent = temp;
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337 node->left = sentinel;
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338 node->right = sentinel;
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339 ngx_rbt_red(node);
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340 }
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341
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342
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343 static ngx_int_t
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426
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344 ngx_http_limit_req_lookup(ngx_http_limit_req_conf_t *lrcf, ngx_uint_t hash,
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602
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345 u_char *data, size_t len, ngx_uint_t *ep)
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416
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346 {
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420
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347 ngx_int_t rc, excess;
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416
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348 ngx_time_t *tp;
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349 ngx_msec_t now;
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350 ngx_msec_int_t ms;
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351 ngx_rbtree_node_t *node, *sentinel;
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352 ngx_http_limit_req_ctx_t *ctx;
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426
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353 ngx_http_limit_req_node_t *lr;
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416
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354
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426
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355 ctx = lrcf->shm_zone->data;
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416
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356
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480
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357 node = ctx->sh->rbtree.root;
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358 sentinel = ctx->sh->rbtree.sentinel;
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416
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359
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360 while (node != sentinel) {
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361
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362 if (hash < node->key) {
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363 node = node->left;
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364 continue;
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365 }
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366
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367 if (hash > node->key) {
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368 node = node->right;
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369 continue;
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370 }
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371
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372 /* hash == node->key */
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373
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374 do {
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426
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375 lr = (ngx_http_limit_req_node_t *) &node->color;
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416
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376
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426
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377 rc = ngx_memn2cmp(data, lr->data, len, (size_t) lr->len);
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416
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378
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379 if (rc == 0) {
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602
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380 ngx_queue_remove(&lr->queue);
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381 ngx_queue_insert_head(&ctx->sh->queue, &lr->queue);
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416
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382
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383 tp = ngx_timeofday();
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384
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385 now = (ngx_msec_t) (tp->sec * 1000 + tp->msec);
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426
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386 ms = (ngx_msec_int_t) (now - lr->last);
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416
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387
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|
426
|
388 excess = lr->excess - ctx->rate * ngx_abs(ms) / 1000 + 1000;
|
|
416
|
389
|
|
534
|
390 if (excess < 0) {
|
|
|
391 excess = 0;
|
|
|
392 }
|
|
|
393
|
|
602
|
394 *ep = excess;
|
|
|
395
|
|
532
|
396 if ((ngx_uint_t) excess > lrcf->burst) {
|
|
|
397 return NGX_BUSY;
|
|
|
398 }
|
|
|
399
|
|
426
|
400 lr->excess = excess;
|
|
|
401 lr->last = now;
|
|
416
|
402
|
|
420
|
403 if (excess) {
|
|
416
|
404 return NGX_AGAIN;
|
|
|
405 }
|
|
|
406
|
|
|
407 return NGX_OK;
|
|
|
408 }
|
|
|
409
|
|
|
410 node = (rc < 0) ? node->left : node->right;
|
|
|
411
|
|
|
412 } while (node != sentinel && hash == node->key);
|
|
|
413
|
|
|
414 break;
|
|
|
415 }
|
|
|
416
|
|
602
|
417 *ep = 0;
|
|
416
|
418
|
|
|
419 return NGX_DECLINED;
|
|
|
420 }
|
|
|
421
|
|
|
422
|
|
|
423 static void
|
|
|
424 ngx_http_limit_req_expire(ngx_http_limit_req_ctx_t *ctx, ngx_uint_t n)
|
|
|
425 {
|
|
420
|
426 ngx_int_t excess;
|
|
416
|
427 ngx_time_t *tp;
|
|
|
428 ngx_msec_t now;
|
|
|
429 ngx_queue_t *q;
|
|
|
430 ngx_msec_int_t ms;
|
|
|
431 ngx_rbtree_node_t *node;
|
|
426
|
432 ngx_http_limit_req_node_t *lr;
|
|
416
|
433
|
|
|
434 tp = ngx_timeofday();
|
|
|
435
|
|
|
436 now = (ngx_msec_t) (tp->sec * 1000 + tp->msec);
|
|
|
437
|
|
|
438 /*
|
|
|
439 * n == 1 deletes one or two zero rate entries
|
|
|
440 * n == 0 deletes oldest entry by force
|
|
|
441 * and one or two zero rate entries
|
|
|
442 */
|
|
|
443
|
|
|
444 while (n < 3) {
|
|
|
445
|
|
480
|
446 if (ngx_queue_empty(&ctx->sh->queue)) {
|
|
416
|
447 return;
|
|
|
448 }
|
|
|
449
|
|
480
|
450 q = ngx_queue_last(&ctx->sh->queue);
|
|
416
|
451
|
|
426
|
452 lr = ngx_queue_data(q, ngx_http_limit_req_node_t, queue);
|
|
416
|
453
|
|
|
454 if (n++ != 0) {
|
|
|
455
|
|
426
|
456 ms = (ngx_msec_int_t) (now - lr->last);
|
|
416
|
457 ms = ngx_abs(ms);
|
|
|
458
|
|
|
459 if (ms < 60000) {
|
|
|
460 return;
|
|
|
461 }
|
|
|
462
|
|
426
|
463 excess = lr->excess - ctx->rate * ms / 1000;
|
|
416
|
464
|
|
420
|
465 if (excess > 0) {
|
|
416
|
466 return;
|
|
|
467 }
|
|
|
468 }
|
|
|
469
|
|
|
470 ngx_queue_remove(q);
|
|
|
471
|
|
|
472 node = (ngx_rbtree_node_t *)
|
|
426
|
473 ((u_char *) lr - offsetof(ngx_rbtree_node_t, color));
|
|
416
|
474
|
|
480
|
475 ngx_rbtree_delete(&ctx->sh->rbtree, node);
|
|
416
|
476
|
|
|
477 ngx_slab_free_locked(ctx->shpool, node);
|
|
|
478 }
|
|
|
479 }
|
|
|
480
|
|
|
481
|
|
|
482 static ngx_int_t
|
|
|
483 ngx_http_limit_req_init_zone(ngx_shm_zone_t *shm_zone, void *data)
|
|
|
484 {
|
|
|
485 ngx_http_limit_req_ctx_t *octx = data;
|
|
|
486
|
|
468
|
487 size_t len;
|
|
416
|
488 ngx_http_limit_req_ctx_t *ctx;
|
|
|
489
|
|
|
490 ctx = shm_zone->data;
|
|
|
491
|
|
|
492 if (octx) {
|
|
|
493 if (ngx_strcmp(ctx->var.data, octx->var.data) != 0) {
|
|
|
494 ngx_log_error(NGX_LOG_EMERG, shm_zone->shm.log, 0,
|
|
|
495 "limit_req \"%V\" uses the \"%V\" variable "
|
|
|
496 "while previously it used the \"%V\" variable",
|
|
480
|
497 &shm_zone->shm.name, &ctx->var, &octx->var);
|
|
416
|
498 return NGX_ERROR;
|
|
|
499 }
|
|
|
500
|
|
480
|
501 ctx->sh = octx->sh;
|
|
416
|
502 ctx->shpool = octx->shpool;
|
|
|
503
|
|
|
504 return NGX_OK;
|
|
|
505 }
|
|
|
506
|
|
|
507 ctx->shpool = (ngx_slab_pool_t *) shm_zone->shm.addr;
|
|
|
508
|
|
480
|
509 if (shm_zone->shm.exists) {
|
|
|
510 ctx->sh = ctx->shpool->data;
|
|
|
511
|
|
|
512 return NGX_OK;
|
|
416
|
513 }
|
|
|
514
|
|
480
|
515 ctx->sh = ngx_slab_alloc(ctx->shpool, sizeof(ngx_http_limit_req_shctx_t));
|
|
|
516 if (ctx->sh == NULL) {
|
|
416
|
517 return NGX_ERROR;
|
|
|
518 }
|
|
|
519
|
|
480
|
520 ctx->shpool->data = ctx->sh;
|
|
|
521
|
|
|
522 ngx_rbtree_init(&ctx->sh->rbtree, &ctx->sh->sentinel,
|
|
416
|
523 ngx_http_limit_req_rbtree_insert_value);
|
|
|
524
|
|
480
|
525 ngx_queue_init(&ctx->sh->queue);
|
|
416
|
526
|
|
480
|
527 len = sizeof(" in limit_req zone \"\"") + shm_zone->shm.name.len;
|
|
468
|
528
|
|
|
529 ctx->shpool->log_ctx = ngx_slab_alloc(ctx->shpool, len);
|
|
|
530 if (ctx->shpool->log_ctx == NULL) {
|
|
|
531 return NGX_ERROR;
|
|
|
532 }
|
|
|
533
|
|
|
534 ngx_sprintf(ctx->shpool->log_ctx, " in limit_req zone \"%V\"%Z",
|
|
480
|
535 &shm_zone->shm.name);
|
|
468
|
536
|
|
416
|
537 return NGX_OK;
|
|
|
538 }
|
|
|
539
|
|
|
540
|
|
|
541 static void *
|
|
|
542 ngx_http_limit_req_create_conf(ngx_conf_t *cf)
|
|
|
543 {
|
|
|
544 ngx_http_limit_req_conf_t *conf;
|
|
|
545
|
|
|
546 conf = ngx_pcalloc(cf->pool, sizeof(ngx_http_limit_req_conf_t));
|
|
|
547 if (conf == NULL) {
|
|
496
|
548 return NULL;
|
|
416
|
549 }
|
|
|
550
|
|
|
551 /*
|
|
|
552 * set by ngx_pcalloc():
|
|
|
553 *
|
|
|
554 * conf->shm_zone = NULL;
|
|
426
|
555 * conf->burst = 0;
|
|
418
|
556 * conf->nodelay = 0;
|
|
416
|
557 */
|
|
|
558
|
|
532
|
559 conf->limit_log_level = NGX_CONF_UNSET_UINT;
|
|
|
560
|
|
416
|
561 return conf;
|
|
|
562 }
|
|
|
563
|
|
|
564
|
|
|
565 static char *
|
|
|
566 ngx_http_limit_req_merge_conf(ngx_conf_t *cf, void *parent, void *child)
|
|
|
567 {
|
|
|
568 ngx_http_limit_req_conf_t *prev = parent;
|
|
|
569 ngx_http_limit_req_conf_t *conf = child;
|
|
|
570
|
|
|
571 if (conf->shm_zone == NULL) {
|
|
656
|
572 conf->shm_zone = prev->shm_zone;
|
|
416
|
573 }
|
|
|
574
|
|
532
|
575 ngx_conf_merge_uint_value(conf->limit_log_level, prev->limit_log_level,
|
|
|
576 NGX_LOG_ERR);
|
|
|
577
|
|
|
578 conf->delay_log_level = (conf->limit_log_level == NGX_LOG_INFO) ?
|
|
|
579 NGX_LOG_INFO : conf->limit_log_level + 1;
|
|
|
580
|
|
416
|
581 return NGX_CONF_OK;
|
|
|
582 }
|
|
|
583
|
|
|
584
|
|
|
585 static char *
|
|
|
586 ngx_http_limit_req_zone(ngx_conf_t *cf, ngx_command_t *cmd, void *conf)
|
|
|
587 {
|
|
|
588 u_char *p;
|
|
|
589 size_t size, len;
|
|
|
590 ngx_str_t *value, name, s;
|
|
|
591 ngx_int_t rate, scale;
|
|
|
592 ngx_uint_t i;
|
|
|
593 ngx_shm_zone_t *shm_zone;
|
|
|
594 ngx_http_limit_req_ctx_t *ctx;
|
|
|
595
|
|
|
596 value = cf->args->elts;
|
|
|
597
|
|
|
598 ctx = NULL;
|
|
|
599 size = 0;
|
|
|
600 rate = 1;
|
|
|
601 scale = 1;
|
|
|
602 name.len = 0;
|
|
|
603
|
|
|
604 for (i = 1; i < cf->args->nelts; i++) {
|
|
|
605
|
|
|
606 if (ngx_strncmp(value[i].data, "zone=", 5) == 0) {
|
|
|
607
|
|
|
608 name.data = value[i].data + 5;
|
|
|
609
|
|
|
610 p = (u_char *) ngx_strchr(name.data, ':');
|
|
|
611
|
|
|
612 if (p) {
|
|
480
|
613 *p = '\0';
|
|
|
614
|
|
416
|
615 name.len = p - name.data;
|
|
|
616
|
|
|
617 p++;
|
|
|
618
|
|
|
619 s.len = value[i].data + value[i].len - p;
|
|
|
620 s.data = p;
|
|
|
621
|
|
|
622 size = ngx_parse_size(&s);
|
|
|
623 if (size > 8191) {
|
|
|
624 continue;
|
|
|
625 }
|
|
|
626 }
|
|
|
627
|
|
|
628 ngx_conf_log_error(NGX_LOG_EMERG, cf, 0,
|
|
|
629 "invalid zone size \"%V\"", &value[i]);
|
|
|
630 return NGX_CONF_ERROR;
|
|
|
631 }
|
|
|
632
|
|
|
633 if (ngx_strncmp(value[i].data, "rate=", 5) == 0) {
|
|
|
634
|
|
|
635 len = value[i].len;
|
|
|
636 p = value[i].data + len - 3;
|
|
|
637
|
|
|
638 if (ngx_strncmp(p, "r/s", 3) == 0) {
|
|
|
639 scale = 1;
|
|
|
640 len -= 3;
|
|
|
641
|
|
|
642 } else if (ngx_strncmp(p, "r/m", 3) == 0) {
|
|
|
643 scale = 60;
|
|
|
644 len -= 3;
|
|
|
645 }
|
|
|
646
|
|
|
647 rate = ngx_atoi(value[i].data + 5, len - 5);
|
|
|
648 if (rate <= NGX_ERROR) {
|
|
|
649 ngx_conf_log_error(NGX_LOG_EMERG, cf, 0,
|
|
|
650 "invalid rate \"%V\"", &value[i]);
|
|
|
651 return NGX_CONF_ERROR;
|
|
|
652 }
|
|
|
653
|
|
|
654 continue;
|
|
|
655 }
|
|
|
656
|
|
|
657 if (value[i].data[0] == '$') {
|
|
|
658
|
|
|
659 value[i].len--;
|
|
|
660 value[i].data++;
|
|
|
661
|
|
|
662 ctx = ngx_pcalloc(cf->pool, sizeof(ngx_http_limit_req_ctx_t));
|
|
|
663 if (ctx == NULL) {
|
|
|
664 return NGX_CONF_ERROR;
|
|
|
665 }
|
|
|
666
|
|
|
667 ctx->index = ngx_http_get_variable_index(cf, &value[i]);
|
|
|
668 if (ctx->index == NGX_ERROR) {
|
|
|
669 return NGX_CONF_ERROR;
|
|
|
670 }
|
|
|
671
|
|
|
672 ctx->var = value[i];
|
|
|
673
|
|
|
674 continue;
|
|
|
675 }
|
|
|
676
|
|
|
677 ngx_conf_log_error(NGX_LOG_EMERG, cf, 0,
|
|
|
678 "invalid parameter \"%V\"", &value[i]);
|
|
|
679 return NGX_CONF_ERROR;
|
|
|
680 }
|
|
|
681
|
|
|
682 if (name.len == 0 || size == 0) {
|
|
|
683 ngx_conf_log_error(NGX_LOG_EMERG, cf, 0,
|
|
|
684 "\"%V\" must have \"zone\" parameter",
|
|
|
685 &cmd->name);
|
|
|
686 return NGX_CONF_ERROR;
|
|
|
687 }
|
|
|
688
|
|
|
689 if (ctx == NULL) {
|
|
|
690 ngx_conf_log_error(NGX_LOG_EMERG, cf, 0,
|
|
|
691 "no variable is defined for limit_req_zone \"%V\"",
|
|
|
692 &cmd->name);
|
|
|
693 return NGX_CONF_ERROR;
|
|
|
694 }
|
|
|
695
|
|
420
|
696 ctx->rate = rate * 1000 / scale;
|
|
416
|
697
|
|
|
698 shm_zone = ngx_shared_memory_add(cf, &name, size,
|
|
|
699 &ngx_http_limit_req_module);
|
|
|
700 if (shm_zone == NULL) {
|
|
|
701 return NGX_CONF_ERROR;
|
|
|
702 }
|
|
|
703
|
|
|
704 if (shm_zone->data) {
|
|
|
705 ctx = shm_zone->data;
|
|
|
706
|
|
|
707 ngx_conf_log_error(NGX_LOG_EMERG, cf, 0,
|
|
|
708 "limit_req_zone \"%V\" is already bound to variable \"%V\"",
|
|
|
709 &value[1], &ctx->var);
|
|
|
710 return NGX_CONF_ERROR;
|
|
|
711 }
|
|
|
712
|
|
|
713 shm_zone->init = ngx_http_limit_req_init_zone;
|
|
|
714 shm_zone->data = ctx;
|
|
|
715
|
|
|
716 return NGX_CONF_OK;
|
|
|
717 }
|
|
|
718
|
|
|
719
|
|
|
720 static char *
|
|
|
721 ngx_http_limit_req(ngx_conf_t *cf, ngx_command_t *cmd, void *conf)
|
|
|
722 {
|
|
426
|
723 ngx_http_limit_req_conf_t *lrcf = conf;
|
|
416
|
724
|
|
418
|
725 ngx_int_t burst;
|
|
|
726 ngx_str_t *value, s;
|
|
|
727 ngx_uint_t i;
|
|
416
|
728
|
|
426
|
729 if (lrcf->shm_zone) {
|
|
416
|
730 return "is duplicate";
|
|
|
731 }
|
|
|
732
|
|
|
733 value = cf->args->elts;
|
|
|
734
|
|
|
735 burst = 0;
|
|
|
736
|
|
|
737 for (i = 1; i < cf->args->nelts; i++) {
|
|
|
738
|
|
|
739 if (ngx_strncmp(value[i].data, "zone=", 5) == 0) {
|
|
|
740
|
|
|
741 s.len = value[i].len - 5;
|
|
|
742 s.data = value[i].data + 5;
|
|
|
743
|
|
426
|
744 lrcf->shm_zone = ngx_shared_memory_add(cf, &s, 0,
|
|
416
|
745 &ngx_http_limit_req_module);
|
|
426
|
746 if (lrcf->shm_zone == NULL) {
|
|
416
|
747 return NGX_CONF_ERROR;
|
|
|
748 }
|
|
|
749
|
|
|
750 continue;
|
|
|
751 }
|
|
|
752
|
|
|
753 if (ngx_strncmp(value[i].data, "burst=", 6) == 0) {
|
|
|
754
|
|
418
|
755 burst = ngx_atoi(value[i].data + 6, value[i].len - 6);
|
|
416
|
756 if (burst <= 0) {
|
|
|
757 ngx_conf_log_error(NGX_LOG_EMERG, cf, 0,
|
|
|
758 "invalid burst rate \"%V\"", &value[i]);
|
|
|
759 return NGX_CONF_ERROR;
|
|
|
760 }
|
|
|
761
|
|
|
762 continue;
|
|
|
763 }
|
|
|
764
|
|
418
|
765 if (ngx_strncmp(value[i].data, "nodelay", 7) == 0) {
|
|
426
|
766 lrcf->nodelay = 1;
|
|
416
|
767 continue;
|
|
|
768 }
|
|
|
769
|
|
|
770 ngx_conf_log_error(NGX_LOG_EMERG, cf, 0,
|
|
|
771 "invalid parameter \"%V\"", &value[i]);
|
|
|
772 return NGX_CONF_ERROR;
|
|
|
773 }
|
|
|
774
|
|
426
|
775 if (lrcf->shm_zone == NULL) {
|
|
416
|
776 ngx_conf_log_error(NGX_LOG_EMERG, cf, 0,
|
|
|
777 "\"%V\" must have \"zone\" parameter",
|
|
|
778 &cmd->name);
|
|
|
779 return NGX_CONF_ERROR;
|
|
|
780 }
|
|
|
781
|
|
426
|
782 if (lrcf->shm_zone->data == NULL) {
|
|
416
|
783 ngx_conf_log_error(NGX_LOG_EMERG, cf, 0,
|
|
|
784 "unknown limit_req_zone \"%V\"",
|
|
480
|
785 &lrcf->shm_zone->shm.name);
|
|
416
|
786 return NGX_CONF_ERROR;
|
|
|
787 }
|
|
|
788
|
|
426
|
789 lrcf->burst = burst * 1000;
|
|
416
|
790
|
|
|
791 return NGX_CONF_OK;
|
|
|
792 }
|
|
|
793
|
|
|
794
|
|
|
795 static ngx_int_t
|
|
|
796 ngx_http_limit_req_init(ngx_conf_t *cf)
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797 {
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798 ngx_http_handler_pt *h;
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799 ngx_http_core_main_conf_t *cmcf;
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800
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801 cmcf = ngx_http_conf_get_module_main_conf(cf, ngx_http_core_module);
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802
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803 h = ngx_array_push(&cmcf->phases[NGX_HTTP_PREACCESS_PHASE].handlers);
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804 if (h == NULL) {
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805 return NGX_ERROR;
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806 }
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807
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808 *h = ngx_http_limit_req_handler;
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809
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810 return NGX_OK;
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811 }
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