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980
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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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981
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13 u_char color;
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14 u_char len;
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980
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15 u_short conn;
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16 u_char data[1];
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17 } ngx_http_limit_zone_node_t;
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18
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19
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20 typedef struct {
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21 ngx_shm_zone_t *shm_zone;
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22 ngx_rbtree_node_t *node;
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23 } ngx_http_limit_zone_cleanup_t;
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24
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25
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26 typedef struct {
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27 ngx_shm_zone_t *shm_zone;
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28 ngx_int_t index;
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29 ngx_uint_t conn;
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30 } ngx_http_limit_zone_conf_t;
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31
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32
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33 static void ngx_http_limit_zone_cleanup(void *data);
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34
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35 static void *ngx_http_limit_zone_create_conf(ngx_conf_t *cf);
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36 static char *ngx_http_limit_zone_merge_conf(ngx_conf_t *cf, void *parent,
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37 void *child);
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38 static char *ngx_http_limit_zone(ngx_conf_t *cf, ngx_command_t *cmd,
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39 void *conf);
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40 static char *ngx_http_limit_conn(ngx_conf_t *cf, ngx_command_t *cmd,
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41 void *conf);
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42 static ngx_int_t ngx_http_limit_zone_init(ngx_conf_t *cf);
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43
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44
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45 static ngx_command_t ngx_http_limit_zone_commands[] = {
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46
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47 { ngx_string("limit_zone"),
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48 NGX_HTTP_MAIN_CONF|NGX_CONF_TAKE2,
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49 ngx_http_limit_zone,
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50 0,
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51 0,
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52 NULL },
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53
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54 { ngx_string("limit_conn"),
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55 NGX_HTTP_MAIN_CONF|NGX_HTTP_SRV_CONF|NGX_HTTP_LOC_CONF|NGX_CONF_TAKE3,
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56 ngx_http_limit_conn,
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57 NGX_HTTP_LOC_CONF_OFFSET,
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58 0,
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59 NULL },
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60
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61 ngx_null_command
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62 };
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63
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64
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65 static ngx_http_module_t ngx_http_limit_zone_module_ctx = {
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66 NULL, /* preconfiguration */
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67 ngx_http_limit_zone_init, /* postconfiguration */
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68
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69 NULL, /* create main configuration */
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70 NULL, /* init main configuration */
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71
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72 NULL, /* create server configuration */
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73 NULL, /* merge server configuration */
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74
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75 ngx_http_limit_zone_create_conf, /* create location configration */
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76 ngx_http_limit_zone_merge_conf /* merge location configration */
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77 };
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78
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79
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80 ngx_module_t ngx_http_limit_zone_module = {
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81 NGX_MODULE_V1,
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82 &ngx_http_limit_zone_module_ctx, /* module context */
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83 ngx_http_limit_zone_commands, /* module directives */
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84 NGX_HTTP_MODULE, /* module type */
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85 NULL, /* init master */
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86 NULL, /* init module */
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87 NULL, /* init process */
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88 NULL, /* init thread */
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89 NULL, /* exit thread */
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90 NULL, /* exit process */
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91 NULL, /* exit master */
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92 NGX_MODULE_V1_PADDING
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93 };
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94
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95
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96 static ngx_int_t
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97 ngx_http_limit_zone_handler(ngx_http_request_t *r)
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98 {
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99 size_t len, n;
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100 uint32_t hash;
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101 ngx_rbtree_t *rbtree;
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102 ngx_slab_pool_t *shpool;
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103 ngx_rbtree_node_t *node, *sentinel;
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104 ngx_pool_cleanup_t *cln;
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105 ngx_http_variable_value_t *vv;
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106 ngx_http_limit_zone_node_t *lz;
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107 ngx_http_limit_zone_conf_t *lzcf;
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108 ngx_http_limit_zone_cleanup_t *lzcln;
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109
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110 lzcf = ngx_http_get_module_loc_conf(r, ngx_http_limit_zone_module);
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111
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112 if (lzcf->shm_zone == NULL) {
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113 return NGX_DECLINED;
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114 }
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115
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116 vv = ngx_http_get_indexed_variable(r, lzcf->index);
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117
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118 if (vv == NULL || vv->not_found) {
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119 return NGX_DECLINED;
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120 }
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121
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122 len = vv->len;
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123
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124 hash = ngx_crc32_short(vv->data, len);
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125
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126 cln = ngx_pool_cleanup_add(r->pool, sizeof(ngx_http_limit_zone_cleanup_t));
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127 if (cln == NULL) {
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128 return NGX_HTTP_INTERNAL_SERVER_ERROR;
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129 }
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130
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131 rbtree = lzcf->shm_zone->data;
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132 shpool = (ngx_slab_pool_t *) lzcf->shm_zone->shm.addr;
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133
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134 ngx_shmtx_lock(&shpool->mutex);
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135
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136 node = rbtree->root;
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137 sentinel = rbtree->sentinel;
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138
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139 while (node != sentinel) {
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140
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141 if (hash < node->key) {
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142 node = node->left;
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143 continue;
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144 }
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145
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146 if (hash > node->key) {
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147 node = node->right;
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148 continue;
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149 }
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150
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151 if (hash == node->key ){
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152 lz = (ngx_http_limit_zone_node_t *) &node->color;
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980
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153
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154 if (len == (size_t) lz->len
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155 && ngx_strncmp(lz->data, vv->data, len) == 0)
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156 {
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157 if ((ngx_uint_t) lz->conn < lzcf->conn) {
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980
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158 lz->conn++;
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159 goto done;
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160 }
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161
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162 ngx_shmtx_unlock(&shpool->mutex);
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163
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164 return NGX_HTTP_SERVICE_UNAVAILABLE;
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165 }
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166 }
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167 }
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168
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169 n = offsetof(ngx_rbtree_node_t, color)
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980
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170 + offsetof(ngx_http_limit_zone_node_t, data)
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171 + len;
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172
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173 node = ngx_slab_alloc_locked(shpool, n);
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174 if (node == NULL) {
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175 ngx_shmtx_unlock(&shpool->mutex);
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176 return NGX_HTTP_SERVICE_UNAVAILABLE;
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177 }
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178
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179 lz = (ngx_http_limit_zone_node_t *) &node->color;
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180
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181 node->key = hash;
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182 lz->len = (u_char) len;
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183 lz->conn = 1;
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184 ngx_memcpy(lz->data, vv->data, len);
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185
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186 ngx_rbtree_insert(rbtree, node);
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187
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188 done:
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189
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190 ngx_log_debug2(NGX_LOG_DEBUG_HTTP, r->connection->log, 0,
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191 "limit zone: %08XD %d", node->key, lz->conn);
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192
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193 ngx_shmtx_unlock(&shpool->mutex);
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194
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195 cln->handler = ngx_http_limit_zone_cleanup;
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196 lzcln = cln->data;
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197
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198 lzcln->shm_zone = lzcf->shm_zone;
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199 lzcln->node = node;
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200
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201 return NGX_DECLINED;
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202 }
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203
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204
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205 static void
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206 ngx_http_limit_zone_cleanup(void *data)
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207 {
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208 ngx_http_limit_zone_cleanup_t *lzcln = data;
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209
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210 ngx_rbtree_t *rbtree;
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211 ngx_slab_pool_t *shpool;
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212 ngx_rbtree_node_t *node;
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213 ngx_http_limit_zone_node_t *lz;
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214
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215 rbtree = lzcln->shm_zone->data;
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216 shpool = (ngx_slab_pool_t *) lzcln->shm_zone->shm.addr;
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217 node = lzcln->node;
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218 lz = (ngx_http_limit_zone_node_t *) &node->color;
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219
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220 ngx_shmtx_lock(&shpool->mutex);
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221
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222 ngx_log_debug2(NGX_LOG_DEBUG_HTTP, lzcln->shm_zone->shm.log, 0,
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223 "limit zone cleanup: %08XD %d", node->key, lz->conn);
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224
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225 lz->conn--;
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226
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227 if (lz->conn == 0) {
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228 ngx_rbtree_delete(rbtree, node);
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229 ngx_slab_free_locked(shpool, node);
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230 }
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231
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232 ngx_shmtx_unlock(&shpool->mutex);
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233 }
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234
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235
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236 static ngx_int_t
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237 ngx_http_limit_zone_init_zone(ngx_shm_zone_t *shm_zone)
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238 {
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239 ngx_rbtree_t *rbtree;
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240 ngx_slab_pool_t *shpool;
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241 ngx_rbtree_node_t *sentinel;
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242
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243 shpool = (ngx_slab_pool_t *) shm_zone->shm.addr;
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244
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245 rbtree = ngx_slab_alloc(shpool, sizeof(ngx_rbtree_t));
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246 if (rbtree == NULL) {
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247 return NGX_ERROR;
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248 }
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249
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250 sentinel = ngx_slab_alloc(shpool, sizeof(ngx_rbtree_node_t));
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251 if (sentinel == NULL) {
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252 return NGX_ERROR;
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253 }
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254
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255 ngx_rbtree_sentinel_init(sentinel);
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256
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257 rbtree->root = sentinel;
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258 rbtree->sentinel = sentinel;
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259 rbtree->insert = ngx_rbtree_insert_value;
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260
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261 shm_zone->data = rbtree;
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262
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263 return NGX_OK;
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264 }
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265
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266
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267 static void *
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268 ngx_http_limit_zone_create_conf(ngx_conf_t *cf)
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269 {
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270 ngx_http_limit_zone_conf_t *conf;
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271
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272 conf = ngx_pcalloc(cf->pool, sizeof(ngx_http_limit_zone_conf_t));
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273 if (conf == NULL) {
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274 return NGX_CONF_ERROR;
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275 }
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276
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277 /*
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278 * set by ngx_pcalloc():
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279 *
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280 * conf->shm_zone = NULL;
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281 * conf->index = 0;
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282 * conf->conn = 0;
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283 */
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284
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285 return conf;
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286 }
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287
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288
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289 static char *
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290 ngx_http_limit_zone_merge_conf(ngx_conf_t *cf, void *parent, void *child)
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291 {
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292 ngx_http_limit_zone_conf_t *prev = parent;
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293 ngx_http_limit_zone_conf_t *conf = child;
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294
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295 if (conf->shm_zone == NULL) {
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296 *conf = *prev;
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297 }
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298
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299 return NGX_CONF_OK;
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300 }
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301
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302
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303 static char *
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304 ngx_http_limit_zone(ngx_conf_t *cf, ngx_command_t *cmd, void *conf)
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305 {
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306 ssize_t n;
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307 ngx_str_t *value;
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308 ngx_shm_zone_t *shm_zone;
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309
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310 value = cf->args->elts;
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311
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312 n = ngx_parse_size(&value[2]);
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313
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314 if (n == NGX_ERROR) {
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315 ngx_conf_log_error(NGX_LOG_EMERG, cf, 0,
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316 "invalid size of limit_zone \"%V\"", &value[2]);
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317 return NGX_CONF_ERROR;
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318 }
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319
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320 if (n < (ngx_int_t) (8 * ngx_pagesize)) {
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321 ngx_conf_log_error(NGX_LOG_EMERG, cf, 0,
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322 "limit_zone \"%V\" is too small", &value[1]);
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323 return NGX_CONF_ERROR;
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324 }
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325
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326
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327 shm_zone = ngx_shared_memory_add(cf, &value[1], n,
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328 &ngx_http_limit_zone_module);
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329 if (shm_zone == NULL) {
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330 return NGX_CONF_ERROR;
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331 }
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332
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333 shm_zone->init = ngx_http_limit_zone_init_zone;
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334
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335 return NGX_CONF_OK;
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336 }
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337
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338
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339 static char *
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340 ngx_http_limit_conn(ngx_conf_t *cf, ngx_command_t *cmd, void *conf)
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341 {
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342 ngx_http_limit_zone_conf_t *lzcf = conf;
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343
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344 ngx_int_t n;
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345 ngx_str_t *value;
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346
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347 value = cf->args->elts;
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348
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349 n = ngx_atoi(value[1].data, value[1].len);
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350 if (n <= 0) {
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351 ngx_conf_log_error(NGX_LOG_EMERG, cf, 0,
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352 "invalid number of connections");
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353 return NGX_CONF_ERROR;
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354 }
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355
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356 if (value[2].data[0] != '$') {
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357 ngx_conf_log_error(NGX_LOG_EMERG, cf, 0,
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358 "invalid variable name \"%V\"", &value[2]);
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359 return NGX_CONF_ERROR;
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360 }
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361
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362 value[2].len--;
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363 value[2].data++;
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364
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365 lzcf->index = ngx_http_get_variable_index(cf, &value[2]);
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366 if (lzcf->index == NGX_ERROR) {
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367 return NGX_CONF_ERROR;
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368 }
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369
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370 lzcf->shm_zone = ngx_shared_memory_add(cf, &value[3], 0,
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371 &ngx_http_limit_zone_module);
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372 if (lzcf->shm_zone == NULL) {
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373 return NGX_CONF_ERROR;
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374 }
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375
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376 lzcf->conn = n;
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377
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378 return NGX_CONF_OK;
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379 }
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380
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381
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382 static ngx_int_t
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383 ngx_http_limit_zone_init(ngx_conf_t *cf)
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384 {
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385 ngx_http_handler_pt *h;
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386 ngx_http_core_main_conf_t *cmcf;
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387
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388 cmcf = ngx_http_conf_get_module_main_conf(cf, ngx_http_core_module);
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389
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390 h = ngx_array_push(&cmcf->phases[NGX_HTTP_PREACCESS_PHASE].handlers);
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391 if (h == NULL) {
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392 return NGX_ERROR;
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393 }
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394
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395 *h = ngx_http_limit_zone_handler;
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396
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397 return NGX_OK;
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398 }
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