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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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644
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4 * Copyright (C) Nginx, Inc.
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416
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5 */
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6
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7
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8 #include <ngx_config.h>
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9 #include <ngx_core.h>
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10 #include <ngx_http.h>
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11
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12
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13 typedef struct {
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480
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14 u_char color;
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15 u_char dummy;
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16 u_short len;
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17 ngx_queue_t queue;
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18 ngx_msec_t last;
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19 /* integer value, 1 corresponds to 0.001 r/s */
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20 ngx_uint_t excess;
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21 u_char data[1];
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416
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22 } ngx_http_limit_req_node_t;
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23
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24
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25 typedef struct {
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480
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26 ngx_rbtree_t rbtree;
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27 ngx_rbtree_node_t sentinel;
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28 ngx_queue_t queue;
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29 } ngx_http_limit_req_shctx_t;
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30
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31
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32 typedef struct {
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33 ngx_http_limit_req_shctx_t *sh;
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34 ngx_slab_pool_t *shpool;
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35 /* integer value, 1 corresponds to 0.001 r/s */
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36 ngx_uint_t rate;
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37 ngx_int_t index;
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38 ngx_str_t var;
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416
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39 } ngx_http_limit_req_ctx_t;
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40
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41
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42 typedef struct {
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480
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43 ngx_shm_zone_t *shm_zone;
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44 /* integer value, 1 corresponds to 0.001 r/s */
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45 ngx_uint_t burst;
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532
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46 ngx_uint_t limit_log_level;
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47 ngx_uint_t delay_log_level;
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48
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49 ngx_uint_t nodelay; /* unsigned nodelay:1 */
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416
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50 } ngx_http_limit_req_conf_t;
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51
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52
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53 static void ngx_http_limit_req_delay(ngx_http_request_t *r);
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426
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54 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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55 ngx_uint_t hash, u_char *data, size_t len, ngx_uint_t *ep);
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416
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56 static void ngx_http_limit_req_expire(ngx_http_limit_req_ctx_t *ctx,
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57 ngx_uint_t n);
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58
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59 static void *ngx_http_limit_req_create_conf(ngx_conf_t *cf);
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60 static char *ngx_http_limit_req_merge_conf(ngx_conf_t *cf, void *parent,
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61 void *child);
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62 static char *ngx_http_limit_req_zone(ngx_conf_t *cf, ngx_command_t *cmd,
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63 void *conf);
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64 static char *ngx_http_limit_req(ngx_conf_t *cf, ngx_command_t *cmd,
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65 void *conf);
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66 static ngx_int_t ngx_http_limit_req_init(ngx_conf_t *cf);
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67
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68
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532
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69 static ngx_conf_enum_t ngx_http_limit_req_log_levels[] = {
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70 { ngx_string("info"), NGX_LOG_INFO },
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71 { ngx_string("notice"), NGX_LOG_NOTICE },
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72 { ngx_string("warn"), NGX_LOG_WARN },
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73 { ngx_string("error"), NGX_LOG_ERR },
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74 { ngx_null_string, 0 }
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75 };
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76
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77
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416
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78 static ngx_command_t ngx_http_limit_req_commands[] = {
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79
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80 { ngx_string("limit_req_zone"),
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81 NGX_HTTP_MAIN_CONF|NGX_CONF_TAKE3,
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82 ngx_http_limit_req_zone,
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83 0,
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84 0,
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85 NULL },
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86
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87 { ngx_string("limit_req"),
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88 NGX_HTTP_MAIN_CONF|NGX_HTTP_SRV_CONF|NGX_HTTP_LOC_CONF|NGX_CONF_TAKE123,
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89 ngx_http_limit_req,
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90 NGX_HTTP_LOC_CONF_OFFSET,
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91 0,
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92 NULL },
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93
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532
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94 { ngx_string("limit_req_log_level"),
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95 NGX_HTTP_MAIN_CONF|NGX_HTTP_SRV_CONF|NGX_HTTP_LOC_CONF|NGX_CONF_TAKE1,
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96 ngx_conf_set_enum_slot,
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97 NGX_HTTP_LOC_CONF_OFFSET,
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98 offsetof(ngx_http_limit_req_conf_t, limit_log_level),
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99 &ngx_http_limit_req_log_levels },
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100
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416
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101 ngx_null_command
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102 };
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103
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104
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105 static ngx_http_module_t ngx_http_limit_req_module_ctx = {
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106 NULL, /* preconfiguration */
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107 ngx_http_limit_req_init, /* postconfiguration */
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108
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109 NULL, /* create main configuration */
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110 NULL, /* init main configuration */
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111
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112 NULL, /* create server configuration */
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113 NULL, /* merge server configuration */
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114
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646
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115 ngx_http_limit_req_create_conf, /* create location configuration */
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116 ngx_http_limit_req_merge_conf /* merge location configuration */
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416
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117 };
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118
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119
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120 ngx_module_t ngx_http_limit_req_module = {
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121 NGX_MODULE_V1,
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122 &ngx_http_limit_req_module_ctx, /* module context */
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123 ngx_http_limit_req_commands, /* module directives */
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124 NGX_HTTP_MODULE, /* module type */
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125 NULL, /* init master */
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126 NULL, /* init module */
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127 NULL, /* init process */
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128 NULL, /* init thread */
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129 NULL, /* exit thread */
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130 NULL, /* exit process */
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131 NULL, /* exit master */
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132 NGX_MODULE_V1_PADDING
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133 };
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134
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135
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136 static ngx_int_t
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137 ngx_http_limit_req_handler(ngx_http_request_t *r)
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138 {
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139 size_t len, n;
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140 uint32_t hash;
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141 ngx_int_t rc;
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420
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142 ngx_uint_t excess;
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416
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143 ngx_time_t *tp;
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144 ngx_rbtree_node_t *node;
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145 ngx_http_variable_value_t *vv;
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146 ngx_http_limit_req_ctx_t *ctx;
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426
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147 ngx_http_limit_req_node_t *lr;
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148 ngx_http_limit_req_conf_t *lrcf;
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416
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149
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150 if (r->main->limit_req_set) {
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151 return NGX_DECLINED;
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152 }
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153
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426
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154 lrcf = ngx_http_get_module_loc_conf(r, ngx_http_limit_req_module);
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416
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155
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426
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156 if (lrcf->shm_zone == NULL) {
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416
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157 return NGX_DECLINED;
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158 }
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159
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426
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160 ctx = lrcf->shm_zone->data;
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416
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161
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162 vv = ngx_http_get_indexed_variable(r, ctx->index);
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163
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164 if (vv == NULL || vv->not_found) {
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165 return NGX_DECLINED;
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166 }
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167
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168 len = vv->len;
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169
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170 if (len == 0) {
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171 return NGX_DECLINED;
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172 }
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173
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174 if (len > 65535) {
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175 ngx_log_error(NGX_LOG_ERR, r->connection->log, 0,
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176 "the value of the \"%V\" variable "
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177 "is more than 65535 bytes: \"%v\"",
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178 &ctx->var, vv);
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179 return NGX_DECLINED;
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180 }
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181
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182 r->main->limit_req_set = 1;
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183
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184 hash = ngx_crc32_short(vv->data, len);
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185
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186 ngx_shmtx_lock(&ctx->shpool->mutex);
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187
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188 ngx_http_limit_req_expire(ctx, 1);
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189
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602
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190 rc = ngx_http_limit_req_lookup(lrcf, hash, vv->data, len, &excess);
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416
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191
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420
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192 ngx_log_debug3(NGX_LOG_DEBUG_HTTP, r->connection->log, 0,
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506
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193 "limit_req: %i %ui.%03ui", rc, excess / 1000, excess % 1000);
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416
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194
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602
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195 if (rc == NGX_DECLINED) {
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196
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197 n = offsetof(ngx_rbtree_node_t, color)
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198 + offsetof(ngx_http_limit_req_node_t, data)
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199 + len;
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200
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201 node = ngx_slab_alloc_locked(ctx->shpool, n);
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202 if (node == NULL) {
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203
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204 ngx_http_limit_req_expire(ctx, 0);
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205
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206 node = ngx_slab_alloc_locked(ctx->shpool, n);
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207 if (node == NULL) {
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208 ngx_shmtx_unlock(&ctx->shpool->mutex);
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209 return NGX_HTTP_SERVICE_UNAVAILABLE;
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210 }
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211 }
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212
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213 lr = (ngx_http_limit_req_node_t *) &node->color;
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214
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215 node->key = hash;
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216 lr->len = (u_char) len;
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217
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218 tp = ngx_timeofday();
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219 lr->last = (ngx_msec_t) (tp->sec * 1000 + tp->msec);
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220
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221 lr->excess = 0;
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222 ngx_memcpy(lr->data, vv->data, len);
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223
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224 ngx_rbtree_insert(&ctx->sh->rbtree, node);
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225
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226 ngx_queue_insert_head(&ctx->sh->queue, &lr->queue);
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227
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416
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228 ngx_shmtx_unlock(&ctx->shpool->mutex);
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229
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602
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230 return NGX_DECLINED;
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231 }
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232
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233 ngx_shmtx_unlock(&ctx->shpool->mutex);
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234
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235 if (rc == NGX_OK) {
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236 return NGX_DECLINED;
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237 }
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238
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239 if (rc == NGX_BUSY) {
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532
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240 ngx_log_error(lrcf->limit_log_level, r->connection->log, 0,
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426
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241 "limiting requests, excess: %ui.%03ui by zone \"%V\"",
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480
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242 excess / 1000, excess % 1000, &lrcf->shm_zone->shm.name);
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416
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243
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244 return NGX_HTTP_SERVICE_UNAVAILABLE;
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245 }
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246
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602
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247 /* rc == NGX_AGAIN */
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418
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248
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602
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249 if (lrcf->nodelay) {
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250 return NGX_DECLINED;
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416
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251 }
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252
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602
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253 ngx_log_error(lrcf->delay_log_level, r->connection->log, 0,
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254 "delaying request, excess: %ui.%03ui, by zone \"%V\"",
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255 excess / 1000, excess % 1000, &lrcf->shm_zone->shm.name);
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416
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256
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602
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257 if (ngx_handle_read_event(r->connection->read, 0) != NGX_OK) {
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258 return NGX_HTTP_INTERNAL_SERVER_ERROR;
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416
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259 }
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260
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602
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261 r->read_event_handler = ngx_http_test_reading;
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262 r->write_event_handler = ngx_http_limit_req_delay;
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263 ngx_add_timer(r->connection->write,
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264 (ngx_msec_t) excess * 1000 / ctx->rate);
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416
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265
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602
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266 return NGX_AGAIN;
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416
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267 }
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268
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269
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270 static void
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271 ngx_http_limit_req_delay(ngx_http_request_t *r)
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272 {
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506
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273 ngx_event_t *wev;
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274
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416
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275 ngx_log_debug0(NGX_LOG_DEBUG_HTTP, r->connection->log, 0,
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506
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276 "limit_req delay");
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277
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278 wev = r->connection->write;
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279
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280 if (!wev->timedout) {
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281
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282 if (ngx_handle_write_event(wev, 0) != NGX_OK) {
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283 ngx_http_finalize_request(r, NGX_HTTP_INTERNAL_SERVER_ERROR);
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284 }
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285
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286 return;
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287 }
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288
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289 wev->timedout = 0;
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416
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290
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291 if (ngx_handle_read_event(r->connection->read, 0) != NGX_OK) {
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292 ngx_http_finalize_request(r, NGX_HTTP_INTERNAL_SERVER_ERROR);
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293 return;
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294 }
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295
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296 r->read_event_handler = ngx_http_block_reading;
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297 r->write_event_handler = ngx_http_core_run_phases;
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298
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299 ngx_http_core_run_phases(r);
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300 }
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301
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302
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303 static void
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304 ngx_http_limit_req_rbtree_insert_value(ngx_rbtree_node_t *temp,
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305 ngx_rbtree_node_t *node, ngx_rbtree_node_t *sentinel)
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306 {
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307 ngx_rbtree_node_t **p;
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426
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308 ngx_http_limit_req_node_t *lrn, *lrnt;
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416
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309
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310 for ( ;; ) {
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311
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312 if (node->key < temp->key) {
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313
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314 p = &temp->left;
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315
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316 } else if (node->key > temp->key) {
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317
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318 p = &temp->right;
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319
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320 } else { /* node->key == temp->key */
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321
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426
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322 lrn = (ngx_http_limit_req_node_t *) &node->color;
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323 lrnt = (ngx_http_limit_req_node_t *) &temp->color;
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416
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324
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426
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325 p = (ngx_memn2cmp(lrn->data, lrnt->data, lrn->len, lrnt->len) < 0)
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416
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326 ? &temp->left : &temp->right;
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327 }
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328
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329 if (*p == sentinel) {
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330 break;
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331 }
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332
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333 temp = *p;
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334 }
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335
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336 *p = node;
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337 node->parent = temp;
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338 node->left = sentinel;
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339 node->right = sentinel;
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340 ngx_rbt_red(node);
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341 }
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342
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343
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344 static ngx_int_t
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426
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345 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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346 u_char *data, size_t len, ngx_uint_t *ep)
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416
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347 {
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420
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348 ngx_int_t rc, excess;
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416
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349 ngx_time_t *tp;
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350 ngx_msec_t now;
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351 ngx_msec_int_t ms;
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352 ngx_rbtree_node_t *node, *sentinel;
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353 ngx_http_limit_req_ctx_t *ctx;
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426
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354 ngx_http_limit_req_node_t *lr;
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416
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355
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426
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356 ctx = lrcf->shm_zone->data;
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416
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357
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480
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358 node = ctx->sh->rbtree.root;
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359 sentinel = ctx->sh->rbtree.sentinel;
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416
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360
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361 while (node != sentinel) {
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362
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363 if (hash < node->key) {
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364 node = node->left;
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365 continue;
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366 }
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367
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368 if (hash > node->key) {
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369 node = node->right;
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370 continue;
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371 }
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372
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373 /* hash == node->key */
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374
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646
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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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646
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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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646
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379 if (rc == 0) {
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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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646
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383 tp = ngx_timeofday();
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534
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384
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646
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385 now = (ngx_msec_t) (tp->sec * 1000 + tp->msec);
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|
|
386 ms = (ngx_msec_int_t) (now - lr->last);
|
|
602
|
387
|
|
646
|
388 excess = lr->excess - ctx->rate * ngx_abs(ms) / 1000 + 1000;
|
|
532
|
389
|
|
646
|
390 if (excess < 0) {
|
|
|
391 excess = 0;
|
|
416
|
392 }
|
|
|
393
|
|
646
|
394 *ep = excess;
|
|
|
395
|
|
|
396 if ((ngx_uint_t) excess > lrcf->burst) {
|
|
|
397 return NGX_BUSY;
|
|
|
398 }
|
|
|
399
|
|
|
400 lr->excess = excess;
|
|
|
401 lr->last = now;
|
|
416
|
402
|
|
646
|
403 if (excess) {
|
|
|
404 return NGX_AGAIN;
|
|
|
405 }
|
|
416
|
406
|
|
646
|
407 return NGX_OK;
|
|
|
408 }
|
|
|
409
|
|
|
410 node = (rc < 0) ? node->left : node->right;
|
|
416
|
411 }
|
|
|
412
|
|
602
|
413 *ep = 0;
|
|
416
|
414
|
|
|
415 return NGX_DECLINED;
|
|
|
416 }
|
|
|
417
|
|
|
418
|
|
|
419 static void
|
|
|
420 ngx_http_limit_req_expire(ngx_http_limit_req_ctx_t *ctx, ngx_uint_t n)
|
|
|
421 {
|
|
420
|
422 ngx_int_t excess;
|
|
416
|
423 ngx_time_t *tp;
|
|
|
424 ngx_msec_t now;
|
|
|
425 ngx_queue_t *q;
|
|
|
426 ngx_msec_int_t ms;
|
|
|
427 ngx_rbtree_node_t *node;
|
|
426
|
428 ngx_http_limit_req_node_t *lr;
|
|
416
|
429
|
|
|
430 tp = ngx_timeofday();
|
|
|
431
|
|
|
432 now = (ngx_msec_t) (tp->sec * 1000 + tp->msec);
|
|
|
433
|
|
|
434 /*
|
|
|
435 * n == 1 deletes one or two zero rate entries
|
|
|
436 * n == 0 deletes oldest entry by force
|
|
|
437 * and one or two zero rate entries
|
|
|
438 */
|
|
|
439
|
|
|
440 while (n < 3) {
|
|
|
441
|
|
480
|
442 if (ngx_queue_empty(&ctx->sh->queue)) {
|
|
416
|
443 return;
|
|
|
444 }
|
|
|
445
|
|
480
|
446 q = ngx_queue_last(&ctx->sh->queue);
|
|
416
|
447
|
|
426
|
448 lr = ngx_queue_data(q, ngx_http_limit_req_node_t, queue);
|
|
416
|
449
|
|
|
450 if (n++ != 0) {
|
|
|
451
|
|
426
|
452 ms = (ngx_msec_int_t) (now - lr->last);
|
|
416
|
453 ms = ngx_abs(ms);
|
|
|
454
|
|
|
455 if (ms < 60000) {
|
|
|
456 return;
|
|
|
457 }
|
|
|
458
|
|
426
|
459 excess = lr->excess - ctx->rate * ms / 1000;
|
|
416
|
460
|
|
420
|
461 if (excess > 0) {
|
|
416
|
462 return;
|
|
|
463 }
|
|
|
464 }
|
|
|
465
|
|
|
466 ngx_queue_remove(q);
|
|
|
467
|
|
|
468 node = (ngx_rbtree_node_t *)
|
|
426
|
469 ((u_char *) lr - offsetof(ngx_rbtree_node_t, color));
|
|
416
|
470
|
|
480
|
471 ngx_rbtree_delete(&ctx->sh->rbtree, node);
|
|
416
|
472
|
|
|
473 ngx_slab_free_locked(ctx->shpool, node);
|
|
|
474 }
|
|
|
475 }
|
|
|
476
|
|
|
477
|
|
|
478 static ngx_int_t
|
|
|
479 ngx_http_limit_req_init_zone(ngx_shm_zone_t *shm_zone, void *data)
|
|
|
480 {
|
|
|
481 ngx_http_limit_req_ctx_t *octx = data;
|
|
|
482
|
|
468
|
483 size_t len;
|
|
416
|
484 ngx_http_limit_req_ctx_t *ctx;
|
|
|
485
|
|
|
486 ctx = shm_zone->data;
|
|
|
487
|
|
|
488 if (octx) {
|
|
|
489 if (ngx_strcmp(ctx->var.data, octx->var.data) != 0) {
|
|
|
490 ngx_log_error(NGX_LOG_EMERG, shm_zone->shm.log, 0,
|
|
|
491 "limit_req \"%V\" uses the \"%V\" variable "
|
|
|
492 "while previously it used the \"%V\" variable",
|
|
480
|
493 &shm_zone->shm.name, &ctx->var, &octx->var);
|
|
416
|
494 return NGX_ERROR;
|
|
|
495 }
|
|
|
496
|
|
480
|
497 ctx->sh = octx->sh;
|
|
416
|
498 ctx->shpool = octx->shpool;
|
|
|
499
|
|
|
500 return NGX_OK;
|
|
|
501 }
|
|
|
502
|
|
|
503 ctx->shpool = (ngx_slab_pool_t *) shm_zone->shm.addr;
|
|
|
504
|
|
480
|
505 if (shm_zone->shm.exists) {
|
|
|
506 ctx->sh = ctx->shpool->data;
|
|
|
507
|
|
|
508 return NGX_OK;
|
|
416
|
509 }
|
|
|
510
|
|
480
|
511 ctx->sh = ngx_slab_alloc(ctx->shpool, sizeof(ngx_http_limit_req_shctx_t));
|
|
|
512 if (ctx->sh == NULL) {
|
|
416
|
513 return NGX_ERROR;
|
|
|
514 }
|
|
|
515
|
|
480
|
516 ctx->shpool->data = ctx->sh;
|
|
|
517
|
|
|
518 ngx_rbtree_init(&ctx->sh->rbtree, &ctx->sh->sentinel,
|
|
416
|
519 ngx_http_limit_req_rbtree_insert_value);
|
|
|
520
|
|
480
|
521 ngx_queue_init(&ctx->sh->queue);
|
|
416
|
522
|
|
480
|
523 len = sizeof(" in limit_req zone \"\"") + shm_zone->shm.name.len;
|
|
468
|
524
|
|
|
525 ctx->shpool->log_ctx = ngx_slab_alloc(ctx->shpool, len);
|
|
|
526 if (ctx->shpool->log_ctx == NULL) {
|
|
|
527 return NGX_ERROR;
|
|
|
528 }
|
|
|
529
|
|
|
530 ngx_sprintf(ctx->shpool->log_ctx, " in limit_req zone \"%V\"%Z",
|
|
480
|
531 &shm_zone->shm.name);
|
|
468
|
532
|
|
416
|
533 return NGX_OK;
|
|
|
534 }
|
|
|
535
|
|
|
536
|
|
|
537 static void *
|
|
|
538 ngx_http_limit_req_create_conf(ngx_conf_t *cf)
|
|
|
539 {
|
|
|
540 ngx_http_limit_req_conf_t *conf;
|
|
|
541
|
|
|
542 conf = ngx_pcalloc(cf->pool, sizeof(ngx_http_limit_req_conf_t));
|
|
|
543 if (conf == NULL) {
|
|
496
|
544 return NULL;
|
|
416
|
545 }
|
|
|
546
|
|
|
547 /*
|
|
|
548 * set by ngx_pcalloc():
|
|
|
549 *
|
|
|
550 * conf->shm_zone = NULL;
|
|
426
|
551 * conf->burst = 0;
|
|
418
|
552 * conf->nodelay = 0;
|
|
416
|
553 */
|
|
|
554
|
|
532
|
555 conf->limit_log_level = NGX_CONF_UNSET_UINT;
|
|
|
556
|
|
416
|
557 return conf;
|
|
|
558 }
|
|
|
559
|
|
|
560
|
|
|
561 static char *
|
|
|
562 ngx_http_limit_req_merge_conf(ngx_conf_t *cf, void *parent, void *child)
|
|
|
563 {
|
|
|
564 ngx_http_limit_req_conf_t *prev = parent;
|
|
|
565 ngx_http_limit_req_conf_t *conf = child;
|
|
|
566
|
|
|
567 if (conf->shm_zone == NULL) {
|
|
644
|
568 conf->shm_zone = prev->shm_zone;
|
|
|
569 conf->burst = prev->burst;
|
|
|
570 conf->nodelay = prev->nodelay;
|
|
416
|
571 }
|
|
|
572
|
|
532
|
573 ngx_conf_merge_uint_value(conf->limit_log_level, prev->limit_log_level,
|
|
|
574 NGX_LOG_ERR);
|
|
|
575
|
|
|
576 conf->delay_log_level = (conf->limit_log_level == NGX_LOG_INFO) ?
|
|
|
577 NGX_LOG_INFO : conf->limit_log_level + 1;
|
|
|
578
|
|
416
|
579 return NGX_CONF_OK;
|
|
|
580 }
|
|
|
581
|
|
|
582
|
|
|
583 static char *
|
|
|
584 ngx_http_limit_req_zone(ngx_conf_t *cf, ngx_command_t *cmd, void *conf)
|
|
|
585 {
|
|
|
586 u_char *p;
|
|
|
587 size_t size, len;
|
|
|
588 ngx_str_t *value, name, s;
|
|
|
589 ngx_int_t rate, scale;
|
|
|
590 ngx_uint_t i;
|
|
|
591 ngx_shm_zone_t *shm_zone;
|
|
|
592 ngx_http_limit_req_ctx_t *ctx;
|
|
|
593
|
|
|
594 value = cf->args->elts;
|
|
|
595
|
|
|
596 ctx = NULL;
|
|
|
597 size = 0;
|
|
|
598 rate = 1;
|
|
|
599 scale = 1;
|
|
|
600 name.len = 0;
|
|
|
601
|
|
|
602 for (i = 1; i < cf->args->nelts; i++) {
|
|
|
603
|
|
|
604 if (ngx_strncmp(value[i].data, "zone=", 5) == 0) {
|
|
|
605
|
|
|
606 name.data = value[i].data + 5;
|
|
|
607
|
|
|
608 p = (u_char *) ngx_strchr(name.data, ':');
|
|
|
609
|
|
|
610 if (p) {
|
|
480
|
611 *p = '\0';
|
|
|
612
|
|
416
|
613 name.len = p - name.data;
|
|
|
614
|
|
|
615 p++;
|
|
|
616
|
|
|
617 s.len = value[i].data + value[i].len - p;
|
|
|
618 s.data = p;
|
|
|
619
|
|
|
620 size = ngx_parse_size(&s);
|
|
|
621 if (size > 8191) {
|
|
|
622 continue;
|
|
|
623 }
|
|
|
624 }
|
|
|
625
|
|
|
626 ngx_conf_log_error(NGX_LOG_EMERG, cf, 0,
|
|
|
627 "invalid zone size \"%V\"", &value[i]);
|
|
|
628 return NGX_CONF_ERROR;
|
|
|
629 }
|
|
|
630
|
|
|
631 if (ngx_strncmp(value[i].data, "rate=", 5) == 0) {
|
|
|
632
|
|
|
633 len = value[i].len;
|
|
|
634 p = value[i].data + len - 3;
|
|
|
635
|
|
|
636 if (ngx_strncmp(p, "r/s", 3) == 0) {
|
|
|
637 scale = 1;
|
|
|
638 len -= 3;
|
|
|
639
|
|
|
640 } else if (ngx_strncmp(p, "r/m", 3) == 0) {
|
|
|
641 scale = 60;
|
|
|
642 len -= 3;
|
|
|
643 }
|
|
|
644
|
|
|
645 rate = ngx_atoi(value[i].data + 5, len - 5);
|
|
|
646 if (rate <= NGX_ERROR) {
|
|
|
647 ngx_conf_log_error(NGX_LOG_EMERG, cf, 0,
|
|
|
648 "invalid rate \"%V\"", &value[i]);
|
|
|
649 return NGX_CONF_ERROR;
|
|
|
650 }
|
|
|
651
|
|
|
652 continue;
|
|
|
653 }
|
|
|
654
|
|
|
655 if (value[i].data[0] == '$') {
|
|
|
656
|
|
|
657 value[i].len--;
|
|
|
658 value[i].data++;
|
|
|
659
|
|
|
660 ctx = ngx_pcalloc(cf->pool, sizeof(ngx_http_limit_req_ctx_t));
|
|
|
661 if (ctx == NULL) {
|
|
|
662 return NGX_CONF_ERROR;
|
|
|
663 }
|
|
|
664
|
|
|
665 ctx->index = ngx_http_get_variable_index(cf, &value[i]);
|
|
|
666 if (ctx->index == NGX_ERROR) {
|
|
|
667 return NGX_CONF_ERROR;
|
|
|
668 }
|
|
|
669
|
|
|
670 ctx->var = value[i];
|
|
|
671
|
|
|
672 continue;
|
|
|
673 }
|
|
|
674
|
|
|
675 ngx_conf_log_error(NGX_LOG_EMERG, cf, 0,
|
|
|
676 "invalid parameter \"%V\"", &value[i]);
|
|
|
677 return NGX_CONF_ERROR;
|
|
|
678 }
|
|
|
679
|
|
|
680 if (name.len == 0 || size == 0) {
|
|
|
681 ngx_conf_log_error(NGX_LOG_EMERG, cf, 0,
|
|
|
682 "\"%V\" must have \"zone\" parameter",
|
|
|
683 &cmd->name);
|
|
|
684 return NGX_CONF_ERROR;
|
|
|
685 }
|
|
|
686
|
|
|
687 if (ctx == NULL) {
|
|
|
688 ngx_conf_log_error(NGX_LOG_EMERG, cf, 0,
|
|
|
689 "no variable is defined for limit_req_zone \"%V\"",
|
|
|
690 &cmd->name);
|
|
|
691 return NGX_CONF_ERROR;
|
|
|
692 }
|
|
|
693
|
|
420
|
694 ctx->rate = rate * 1000 / scale;
|
|
416
|
695
|
|
|
696 shm_zone = ngx_shared_memory_add(cf, &name, size,
|
|
|
697 &ngx_http_limit_req_module);
|
|
|
698 if (shm_zone == NULL) {
|
|
|
699 return NGX_CONF_ERROR;
|
|
|
700 }
|
|
|
701
|
|
|
702 if (shm_zone->data) {
|
|
|
703 ctx = shm_zone->data;
|
|
|
704
|
|
|
705 ngx_conf_log_error(NGX_LOG_EMERG, cf, 0,
|
|
|
706 "limit_req_zone \"%V\" is already bound to variable \"%V\"",
|
|
|
707 &value[1], &ctx->var);
|
|
|
708 return NGX_CONF_ERROR;
|
|
|
709 }
|
|
|
710
|
|
|
711 shm_zone->init = ngx_http_limit_req_init_zone;
|
|
|
712 shm_zone->data = ctx;
|
|
|
713
|
|
|
714 return NGX_CONF_OK;
|
|
|
715 }
|
|
|
716
|
|
|
717
|
|
|
718 static char *
|
|
|
719 ngx_http_limit_req(ngx_conf_t *cf, ngx_command_t *cmd, void *conf)
|
|
|
720 {
|
|
426
|
721 ngx_http_limit_req_conf_t *lrcf = conf;
|
|
416
|
722
|
|
418
|
723 ngx_int_t burst;
|
|
|
724 ngx_str_t *value, s;
|
|
|
725 ngx_uint_t i;
|
|
416
|
726
|
|
426
|
727 if (lrcf->shm_zone) {
|
|
416
|
728 return "is duplicate";
|
|
|
729 }
|
|
|
730
|
|
|
731 value = cf->args->elts;
|
|
|
732
|
|
|
733 burst = 0;
|
|
|
734
|
|
|
735 for (i = 1; i < cf->args->nelts; i++) {
|
|
|
736
|
|
|
737 if (ngx_strncmp(value[i].data, "zone=", 5) == 0) {
|
|
|
738
|
|
|
739 s.len = value[i].len - 5;
|
|
|
740 s.data = value[i].data + 5;
|
|
|
741
|
|
426
|
742 lrcf->shm_zone = ngx_shared_memory_add(cf, &s, 0,
|
|
416
|
743 &ngx_http_limit_req_module);
|
|
426
|
744 if (lrcf->shm_zone == NULL) {
|
|
416
|
745 return NGX_CONF_ERROR;
|
|
|
746 }
|
|
|
747
|
|
|
748 continue;
|
|
|
749 }
|
|
|
750
|
|
|
751 if (ngx_strncmp(value[i].data, "burst=", 6) == 0) {
|
|
|
752
|
|
418
|
753 burst = ngx_atoi(value[i].data + 6, value[i].len - 6);
|
|
416
|
754 if (burst <= 0) {
|
|
|
755 ngx_conf_log_error(NGX_LOG_EMERG, cf, 0,
|
|
|
756 "invalid burst rate \"%V\"", &value[i]);
|
|
|
757 return NGX_CONF_ERROR;
|
|
|
758 }
|
|
|
759
|
|
|
760 continue;
|
|
|
761 }
|
|
|
762
|
|
418
|
763 if (ngx_strncmp(value[i].data, "nodelay", 7) == 0) {
|
|
426
|
764 lrcf->nodelay = 1;
|
|
416
|
765 continue;
|
|
|
766 }
|
|
|
767
|
|
|
768 ngx_conf_log_error(NGX_LOG_EMERG, cf, 0,
|
|
|
769 "invalid parameter \"%V\"", &value[i]);
|
|
|
770 return NGX_CONF_ERROR;
|
|
|
771 }
|
|
|
772
|
|
426
|
773 if (lrcf->shm_zone == NULL) {
|
|
416
|
774 ngx_conf_log_error(NGX_LOG_EMERG, cf, 0,
|
|
|
775 "\"%V\" must have \"zone\" parameter",
|
|
|
776 &cmd->name);
|
|
|
777 return NGX_CONF_ERROR;
|
|
|
778 }
|
|
|
779
|
|
426
|
780 if (lrcf->shm_zone->data == NULL) {
|
|
416
|
781 ngx_conf_log_error(NGX_LOG_EMERG, cf, 0,
|
|
|
782 "unknown limit_req_zone \"%V\"",
|
|
480
|
783 &lrcf->shm_zone->shm.name);
|
|
416
|
784 return NGX_CONF_ERROR;
|
|
|
785 }
|
|
|
786
|
|
426
|
787 lrcf->burst = burst * 1000;
|
|
416
|
788
|
|
|
789 return NGX_CONF_OK;
|
|
|
790 }
|
|
|
791
|
|
|
792
|
|
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793 static ngx_int_t
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794 ngx_http_limit_req_init(ngx_conf_t *cf)
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795 {
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796 ngx_http_handler_pt *h;
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797 ngx_http_core_main_conf_t *cmcf;
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798
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799 cmcf = ngx_http_conf_get_module_main_conf(cf, ngx_http_core_module);
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800
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801 h = ngx_array_push(&cmcf->phases[NGX_HTTP_PREACCESS_PHASE].handlers);
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802 if (h == NULL) {
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803 return NGX_ERROR;
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804 }
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805
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806 *h = ngx_http_limit_req_handler;
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807
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808 return NGX_OK;
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809 }
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